CN114940158A - Hybrid vehicle discharge control method and device and hybrid vehicle - Google Patents

Abstract

The invention discloses a discharge control method, device and hybrid vehicle for a hybrid vehicle. The method includes: acquiring system state parameters of the hybrid vehicle, the system state parameters comprising: power battery state parameters; acquiring graded discharge threshold parameters of the hybrid vehicle , the graded discharge threshold parameters include: a first state threshold and a second state threshold, the first state threshold is higher than the second state threshold; the power battery state parameter is compared with the first state threshold and the second state threshold, according to the comparison As a result, the target discharge mode is determined, and the target discharge mode includes battery discharge mode and power generation discharge mode; according to the target discharge mode, discharge high voltage power-on and external discharge are performed. The present invention reasonably selects the external discharge mode through the system state parameters and graded discharge threshold parameters of the hybrid vehicle, thereby improving the external discharge capability of the hybrid vehicle.

Description

Hybrid vehicle discharge control method, device and hybrid vehicle

technical field

The present invention relates to the technical field of hybrid vehicle discharge control, in particular to a hybrid vehicle discharge control method, device and hybrid vehicle.

Background technique

With the development of new energy vehicle technology, new energy vehicles are more and more popular. New energy vehicles are equipped with large-capacity power batteries, which can be used for external discharge in scenarios where electricity is inconvenient, such as in the wild.

At present, the external discharge function of new energy vehicles is mainly realized by the external discharge of power batteries. Plug-in hybrid electric vehicle (PHEV) combines the functions of traditional fuel vehicles and pure electric vehicles. In addition to large-capacity power batteries, it is also equipped with a fuel power system. This strategy affects the external discharge capacity of plug-in hybrid electric vehicles and cannot meet the long-term and high-power electricity demand of users.

SUMMARY OF THE INVENTION

The invention provides a hybrid vehicle discharge control method, device and hybrid vehicle, so as to solve the problem of insufficient external discharge capacity of the vehicle caused by the inability of the existing new energy vehicle external discharge strategy to be compatible with the plug-in hybrid vehicle, and to improve the hybrid power Car external discharge capacity.

According to an aspect of the present invention, a method for controlling the discharge of a hybrid electric vehicle is provided. The method includes: acquiring system state parameters of the hybrid electric vehicle, where the system state parameters include: a vehicle power-on state, a charging port connection state, a transmission Gear status, power battery status parameters, charger running status and fault detection parameters;

Acquiring graded discharge threshold parameters of the hybrid vehicle, where the graded discharge threshold parameters include: a first state threshold and a second state threshold, the first state threshold being higher than the second state threshold;

Comparing the power battery state parameter with the first state threshold and the second state threshold, and determining a target discharge mode according to the comparison result, where the target discharge mode includes a battery discharge mode and a power generation discharge mode;

The discharge high voltage power-on and external discharge are performed according to the target discharge mode.

According to another aspect of the present invention, there is provided a hybrid vehicle discharge control device, the device comprising:

The acquisition unit is used to acquire system state parameters of the hybrid vehicle, the system state parameters include: vehicle power-on state, charging port connection state, transmission gear state, power battery state parameters, charger running state and fault detection parameters ;

a threshold storage unit, configured to acquire a graded discharge threshold parameter of the hybrid vehicle, where the graded discharge threshold parameter includes: a first state threshold and a second state threshold, the first state threshold being higher than the second state threshold;

a discharge mode selection unit, configured to compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result, where the target discharge mode includes a battery discharge mode and power generation and discharge mode;

The discharge execution unit is configured to perform discharge high voltage power-on and external discharge according to the target discharge mode.

According to another aspect of the present invention, there is provided a hybrid vehicle equipped with the above-described hybrid vehicle discharge control device.

The technical solution of the embodiment of the present invention is to obtain the system state parameter of the hybrid vehicle by setting the graded discharge threshold parameter, which includes the first state threshold and the second state threshold, and compare the power battery state parameter in the system state parameter with the power battery state parameter. The first state threshold and the second state threshold are compared, and the external discharge mode is reasonably selected according to the comparison result between the system state parameter and the graded discharge threshold parameter. When the power battery state parameter is higher than the first state threshold, the battery discharge mode is executed. Discharge high-voltage power-on and external discharge, when the power battery state parameter is lower than the second state threshold, the discharge high-voltage power-on and external discharge are performed according to the power generation and discharge mode, which solves the problem that the existing external discharge strategy of new energy vehicles cannot be compatible with plug-in. The problem of insufficient external discharge capacity of the vehicle is caused by the hybrid electric vehicle, which is beneficial to improve the external discharge capacity of the hybrid electric vehicle.

It should be understood that the content described in this section is not intended to identify key or critical features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become readily understood from the following description.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a plug-in hybrid vehicle according to Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a method for controlling the discharge of a hybrid vehicle provided in Embodiment 1 of the present invention;

FIG. 3 is a flowchart of a method for controlling discharge of a hybrid vehicle according to Embodiment 2 of the present invention;

4 is a flowchart of a method for controlling discharge of a hybrid vehicle provided in Embodiment 3 of the present invention;

FIG. 5 is a flowchart of a method for controlling the discharge of a hybrid vehicle according to Embodiment 4 of the present invention;

6 is a flowchart of a method for controlling discharge of a hybrid vehicle provided in Embodiment 5 of the present invention;

FIG. 7 is a flowchart of a method for controlling discharge of a hybrid vehicle according to Embodiment 6 of the present invention;

FIG. 8 is a schematic structural diagram of a hybrid vehicle discharge control device according to Embodiment 7 of the present invention.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Example 1

Embodiment 1 of the present invention provides a flowchart of a method for controlling the discharge of a hybrid electric vehicle. The method can be executed by a discharge control device, and the discharge control device can be provided in a plug-in hybrid vehicle.

Optionally, FIG. 1 is a schematic structural diagram of a plug-in hybrid vehicle according to Embodiment 1 of the present invention.

As shown in FIG. 1 , the plug-in hybrid electric vehicle adopts a P2 configuration, including an engine 1, a starter 2 connected to the engine 1 through a flywheel with a torsion damper 3, a starter reduction gear mechanism 4, and the engine 1. C0 clutch 5 disconnected from power, oil pump speed-up gear 6, DCT clutch 7, DCT gearbox 8, final reducer 9, drive motor 10, and mechanical hydraulic oil pump 11 between the drive motor 10 and the DCT clutch 7 , . The plug-in hybrid vehicle can run in a pure electric driving mode, a P-speed idle power generation mode, or a hybrid driving mode.

The high-voltage system of the plug-in hybrid electric vehicle includes: a power battery, a vehicle-mounted two-way charger capable of AC charging/discharging, a DC/DC conversion device, and a high-voltage relay arranged between the power battery and the two-way charger. The relays include main positive relay, main negative relay and precharge relay.

FIG. 2 is a flowchart of a method for controlling discharge of a hybrid vehicle according to Embodiment 1 of the present invention.

With reference to FIG. 1 and FIG. 2 , the method for controlling the discharge of a hybrid electric vehicle provided by an embodiment of the present invention includes the following steps:

S110. Acquire system state parameters of the hybrid vehicle.

The system state parameter refers to a parameter representing the operating state and the charging and discharging state of the hybrid vehicle.

In one embodiment, the system state parameters include but are not limited to: vehicle power-on state, charging port connection state, transmission gear state, power battery state parameters, charger running state, and fault detection parameters.

Among them, the vehicle power-on state includes the vehicle non-drive power-on state and the vehicle drive power-on state. The vehicle-drive power-on state refers to the power-on state of the drive system of the vehicle in the running stage; the vehicle non-drive power-on state Refers to the power-on state when the drive system of the vehicle is in the stop operation stage. When the vehicle performs the external discharge function, the hybrid vehicle should be in the non-driving power-on state. When the vehicle is in the driving and power-on state, if the discharge gun is inserted, the whole vehicle will enter the non-driving power-on state.

The connection status of the charging port refers to the connection status between the charging port and the charging/discharging gun. Typically, the charging port connection state includes a discharge gun connected state and a discharge gun disconnected state.

The gear status of the transmission usually includes N gear, P gear, D gear and R gear. N gear is neutral gear, which is suitable for short stay during the driving process of the car. P gear is parking gear, which is both neutral and has a braking mechanism. Its function It is the brakes after parking to prevent the vehicle from moving. The D gear is a forward gear, which is used for general road driving, and the R gear is a reverse gear, which is used when the vehicle is in reverse. When the vehicle performs the external discharge function, the transmission gear should be in the P gear.

In one embodiment, the power battery state parameters include power battery power and/or power battery discharge power. Before the vehicle external discharge function is activated, it should be ensured that the power battery power is not lower than the threshold value allowed by the vehicle discharge function, and the power battery is discharged. The power is not lower than the power-on threshold of the discharge power.

S120. Acquire a graded discharge threshold parameter of the hybrid vehicle.

In an embodiment of the present invention, the graded discharge threshold parameter includes a first state threshold and a second state threshold, wherein the first state threshold is higher than the second state threshold.

Optionally, the graded discharge threshold parameter includes a discharge power threshold parameter and/or a discharge power threshold parameter.

Specifically, when the power of the power battery is used as the power battery state parameter, the first state threshold and the second state threshold may be the discharge power threshold parameters; when the discharge power of the power battery is used as the power battery state parameter, the first state threshold The threshold and the second state threshold may be discharge power threshold parameters. The first state threshold may be the upper threshold of discharge power or the upper threshold of discharge power required for starting the external discharge function of the power battery, and the second state threshold may be the lower threshold of discharge power or the lower threshold of discharge power required for the external discharge function of the power battery to be turned off.

S130. Compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result.

The target discharge mode includes a battery discharge mode and a power generation discharge mode. The battery discharge mode is a mode in which only the power battery is discharged to the outside, and the power generation discharge mode is a mode in which the engine 1 drives the generator (eg, the drive motor 10 ) to discharge externally while charging the power battery.

Specifically, before the vehicle's external discharge function is activated, the power battery state parameter is compared with the first state threshold and the second state threshold to determine the target discharge mode. If the power battery state parameter is higher than the first state threshold, it is determined that the power If the battery power is sufficient, it is determined that the target discharge mode of the hybrid vehicle is the battery discharge mode, and the power battery is used to discharge externally; if the power battery state parameter is lower than the second state threshold, it is determined that the power battery power is insufficient to support the external discharge, and determine The target discharge mode of the hybrid vehicle is the power generation discharge mode, and the engine 1 is used to drive the generator to discharge externally, while charging the power battery; if the power battery parameter is greater than or equal to the second state threshold and less than or equal to the first state threshold, then the hybrid vehicle The target discharge mode can be either a battery discharge mode or a power generation discharge mode, which is not limited in this application. Preferably, the difference between the first state threshold and the second state threshold may be set to be greater than 10% to avoid frequent starting and stopping of the engine 1 .

Exemplarily, the first state threshold may be set as the full battery power or 75% of the full power, and the second state threshold may be set as the battery full power or 50% of the full power. When the battery power is lower than 50%, the target discharge mode is determined to be the power generation discharge mode. Before the vehicle's external discharge function is activated, if the power of the power battery is higher than 75%, the target charging mode is determined to be the battery discharge mode.

S140 , performing high-voltage discharge power-on and external discharge according to the target discharge mode.

In the embodiment of the present invention, a vehicle hybrid control unit (Vehicular Communication Unit, VCU) may be used to control the high-voltage relay to power on the high-voltage system, and control the vehicle-mounted bidirectional charger to execute the external discharge command.

Specifically, when it is determined that the target discharge mode is the battery discharge mode, the power battery is connected to the two-way charger. At this time, the power battery is discharged through high-voltage power-on for external discharge. The specific process of high-voltage power-on is as follows: The hybrid control unit VCU first controls The main negative relay is closed, and then the pre-charging relay is controlled to close. After the pre-charging is completed, the main positive relay is controlled to close and the pre-charging relay is disconnected. After the high-voltage relay is closed, the hybrid control unit VCU controls the on-board two-way charger to execute the discharge command. When the on-board two-way charger reports that the state is discharging, the high-voltage power-on discharge is completed, and the system enters the battery discharge mode. When it is determined that the target discharge mode is the power generation discharge mode, the hybrid control unit VCU controls the clutch coupling between the engine 1 and the drive motor 10, and controls the engine 1 to start, the engine 1 drives the drive motor 10 to run in the power generation state, and the output of the power generation The electric energy is discharged externally through the on-board two-way charger, and the power battery is charged through the high-voltage relay at the same time.

In the technical solution of the embodiment of the present invention, the system state parameters of the hybrid electric vehicle are obtained, and the system state parameters include: power battery state parameters; and the graded discharge threshold parameters of the hybrid vehicle are obtained, and the graded discharge threshold parameters include: a first state threshold and a first state threshold. Two state thresholds, the first state threshold is higher than the second state threshold; the power battery state parameter is compared with the first state threshold and the second state threshold, and the target discharge mode is determined according to the comparison result. When the first state threshold is reached, the discharge high voltage power-on and external discharge are performed according to the battery discharge mode. When the power battery state parameter is lower than the second state threshold, the discharge high-voltage power-on and external discharge are performed according to the power generation and discharge mode, which solves the problem of the current situation. Some new energy vehicles' external discharge strategies cannot be compatible with plug-in hybrid vehicles, which leads to the problem of insufficient external discharge capacity of vehicles, which is beneficial to improve the external discharge capacity of hybrid vehicles.

Embodiment 2

FIG. 3 is a flowchart of a method for controlling the discharge of a hybrid vehicle according to the second embodiment of the present invention. On the basis of the above-mentioned embodiment, it exemplarily shows a method for performing high-voltage power-on discharge and external discharge according to the power-generating-discharging mode. specific implementation.

As shown in FIG. 3 , the method for controlling the discharge of a hybrid electric vehicle provided by an embodiment of the present invention includes the following steps:

S210. Acquire system state parameters of the hybrid vehicle.

S220. Acquire a graded discharge threshold parameter of the hybrid vehicle.

S230. Compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result.

S240 , performing high-voltage power-on of discharge and external discharge according to the power generation and discharge mode.

S241 , judging whether the system state parameter satisfies the preset power generation shutdown condition.

If it is determined that the system state parameter satisfies any of the above preset power generation shutdown conditions, step S250 is executed; otherwise, step S240 is returned to.

S250: Execute the generator shutdown action.

In one embodiment, the preset power generation shutdown condition includes at least one of the following:

1) The power battery state parameter is higher than the first threshold state.

Typically, the state that the power battery state parameter is higher than the first threshold value includes: the power battery power level is higher than the discharge power upper limit threshold value, and the power battery discharge power is higher than the discharge power upper limit threshold value.

2) Any one of the engine, drive motor or clutch has a starting failure.

Wherein, the drive motor failure includes the power generation failure of the drive motor 10, and the clutch failure includes the C0 clutch 5 or the hydraulic system failure.

3) The connection status of the charging port is that the discharge gun is not connected or the connection of the discharge gun is abnormal.

4) The discharge gun has abnormal temperature failure.

In the embodiment of the present invention, a temperature sensor may be integrated in the discharge gun, and the hybrid control unit VCU determines whether the temperature of the discharge gun exceeds a preset temperature threshold. If the temperature of the discharge gun exceeds the preset temperature threshold, it is determined that the discharge gun has an abnormal temperature fault .

5) There is an abnormal discharge fault in the high-voltage discharge circuit.

The high-voltage discharge circuit includes a bidirectional charger, a high-voltage relay, and a DC/DC conversion device. If any one of the bidirectional charger, the high-voltage relay, or the DC/DC conversion device reports a fault, the high-voltage discharge circuit has abnormal discharge failure.

6) The charger sends out a request to unlock the electronic lock.

In the embodiment of the present invention, an electronic lock function can be set on the two-way charger to lock the charging state or the discharging state of the charger. During the working process of the charger, the electronic lock is reliably locked; if the charger sends out an electronic lock Unlock request, it can be determined that the charger has a shutdown request.

Specifically, when the system is in the power generation and discharge mode, if the power of the power battery is higher than the upper threshold of the discharge power, and the discharge power of the power battery is higher than the upper threshold of the discharge power, or the system has a discharge shutdown request, for example, the discharge gun is abnormally connected, Or the charger sends out a request to unlock the electronic lock, then the system executes the shutdown action of the power generation and discharge mode, controls the engine 1 and the drive motor 10 to stop, and the system enters the power generation and discharge shutdown mode. By optimizing the shutdown conditions of power generation, it can avoid external power generation through the fuel system in the state of system failure and high power battery power, save the power generation cost of the fuel system, and improve the discharge capacity of the system.

Embodiment 3

FIG. 4 is a flow chart of a method for controlling discharge of a hybrid vehicle according to Embodiment 3 of the present invention, exemplarily showing a specific implementation of shutdown control in a power generation and discharge mode.

As shown in Figure 4, controlling the vehicle to perform the power generation shutdown action includes the following steps:

S351. Acquire a torque feedback value of the engine, and issue a clutch disengagement request according to the torque feedback value.

In this step, the hybrid control unit VCU can be used to control the output torque of the engine 1 to zero, the torque sensor is used to collect the output torque feedback value of the engine 1, and the output torque feedback value is sent to the engine management unit (Engine Management System, EMS) . When the torque feedback value received by the engine management unit EMS is equal to or approximately equal to zero, the hybrid control unit VCU sends a disengagement request to the C0 clutch 5 .

S352: Acquire the disengagement state of the clutch, and issue a fuel injection stop request according to the disengagement state.

In this step, when the feedback state of the C0 clutch 5 is disengaged, the hybrid control unit VCU sends a request to stop fuel injection to the engine management unit EMS, and the engine management unit EMS turns off the engine by itself.

S353: Acquire a rotational speed feedback value of the driving motor, and issue a stop motor enable signal according to the rotational speed feedback value.

In this step, the hybrid control unit VCU sends a zero speed request to the motor control unit (Micro Controller Unit, MCU), uses a speed sensor to collect the speed feedback value of the driving motor 10, and sends the speed feedback value to the motor control unit MCU, When the motor control unit MCU receives that the speed feedback value is equal to or approximately equal to zero, the hybrid control unit VCU stops the motor control unit MCU from enabling.

S354. Determine whether the shutdown is completed according to the operating state of the driving motor, the operating state of the engine, and the shutdown time.

Specifically, the hybrid control unit VCU receives the running state of the drive motor 10 fed back by the motor control unit MCU and the engine running state fed back by the engine management unit EMS. If the running state of the drive motor 10 is stalled (for example, Init), and the engine running state If it is a shutdown (for example, Notrun), or the shutdown process in the power generation and discharge mode times out, the hybrid control unit VCU determines that the shutdown is completed.

The embodiment of the present invention determines whether the system state parameter meets the preset power generation shutdown condition when the target discharge mode is the power generation discharge mode, performs the generator shutdown operation when the preset power generation shutdown condition is met, and flexibly switches to the external discharge mode, thereby improving the hybrid vehicle. The external discharge capacity can avoid external power generation through the fuel system in the state of system failure and high power battery power, which is conducive to saving the power generation cost of the fuel system.

Embodiment 4

FIG. 5 is a flowchart of a method for controlling the discharge of a hybrid vehicle according to Embodiment 4 of the present invention. On the basis of the above-mentioned embodiment, it exemplarily shows a method for performing high-voltage power-on and external discharge according to a battery discharge mode. specific implementation.

As shown in Figure 5, the hybrid vehicle discharge control method specifically includes:

S410. Acquire system state parameters of the hybrid vehicle.

S420. Acquire a graded discharge threshold parameter of the hybrid vehicle.

S430. Compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result.

S440 , perform high-voltage power-on and external discharge according to the battery discharge mode.

S441 , judging whether the system state parameter satisfies the preset discharge power-off condition.

If it is determined that the system state parameter satisfies the preset discharge power-off condition, step S450 is performed; otherwise, step S440 is returned to.

S450: Execute the action of discharging electricity.

In one embodiment, the preset discharge power-off condition includes at least one of the following:

1) The connection status of the charging port is that the charging port is not connected to the discharge gun or the discharge gun is abnormally connected.

2) The discharge gun has abnormal temperature failure.

3) The high-voltage discharge circuit has abnormal discharge and power-off faults.

4) The charger sends a request to unlock the electronic lock.

5) The power battery state parameter is lower than the difference between the second state threshold and the preset offset.

Wherein, the preset offset is a reasonable electric quantity or power offset threshold generated by discharging the power battery to the second state threshold. The preset offset can be obtained through calibration, and its specific value is not limited. Typically, the preset offset includes a preset discharge power offset and a preset discharge power offset.

Specifically, when the system is in the battery discharge mode, if the power of the power battery is lower than the difference between the lower threshold of the discharge power and the preset discharge power offset, or the discharge power of the power battery is lower than the lower threshold of the discharge power and the preset discharge power offset Set the difference between the discharge power offsets, or the system has a discharge shutdown request, for example, the discharge gun is abnormally connected, or the charger sends an electronic lock unlock request, it is determined that the power battery is in an abnormal state, and the external discharge should be stopped at this time. That is, the discharge and power-off action is performed.

Further, when the target discharge mode is the battery discharge mode, performing discharge high-voltage power-on and external discharge according to the target discharge mode, further comprising: using a hybrid control unit to lock and protect the battery discharge mode, and controlling the two-way charger to run in Discharge mode, and determine the output current of the bidirectional charger according to the power load parameters.

Wherein, the blocking protection includes but is not limited to: 1) The control of the drive motor is disabled. 2) Control the discharge gun to be in the locked state. 3) It is forbidden to respond to the high pressure request command while driving. 4) Forbid the transmission to go out of P gear.

Specifically, when the system is in the battery discharge mode, the hybrid control unit can collect the electrical power or electrical current of the electrical load in real time, and adjust the output current of the charger according to the electrical load current or electrical load power to match the user. At the same time, the hybrid control unit locks the current discharge mode, controls the drive motor 10 to be disabled, and controls the discharge gun to be in a locked state, prohibiting the system from responding to the driving high voltage request command, and prohibiting the transmission from outputting P until the system state parameters meet the preset discharge power-off conditions, which is beneficial to improve the reliability and safety of external discharge of the system.

Embodiment 5

Optionally, FIG. 6 is a flowchart of a method for controlling the discharge of a hybrid electric vehicle according to Embodiment 5 of the present invention. On the basis of the above embodiment, a specific implementation of judging the discharge and power-on conditions is added before the discharge is performed. , to avoid abnormal power-on caused by system failure.

As shown in FIG. 6 , before the discharge high voltage power-on is performed according to the target discharge mode, the discharge control method further includes:

S510. Acquire system state parameters of the hybrid vehicle.

S520. Acquire a graded discharge threshold parameter of the hybrid vehicle.

S530. Compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result.

S531: Determine whether the system state parameters meet the preset discharge and power-on conditions.

If the system state parameter satisfies the preset discharge and power-on conditions, step S540 is performed; otherwise, step S510 is returned to.

S540: Execute discharge high voltage power-on and external discharge according to the target discharge mode.

In one embodiment, the preset discharge and power-on conditions include but are not limited to:

1) The power battery state parameter is higher than the first state threshold. Wherein, that the power battery state parameter is higher than the first state threshold includes: the power battery power is higher than the discharge power upper threshold, and the power battery discharge power is higher than the discharge power upper threshold.

2) The transmission gear status is P gear. The transmission gear state can be collected by the transmission control unit TCU and transmitted to the hybrid control unit VCU.

It should be noted that when the transmission gear state is the P gear, the power-on state of the entire vehicle is the non-drive power-on state.

3) The connection status of the charging port is connected to the discharge gun.

4) Discharge fault signal is not detected. The discharge fault signal includes but is not limited to: abnormal temperature fault signal reported by the discharge gun and abnormal discharge fault in the high-voltage discharge circuit.

Specifically, before controlling the discharge high voltage power-on, when the above preset discharge power-on conditions are simultaneously satisfied within a certain period of time, it can be determined that the system can perform the discharge high-voltage power-on operation to avoid abnormal power-on or device damage caused by system failures , which is beneficial to improve the reliability and safety of external discharge of the system.

Embodiment 6

Optionally, FIG. 7 is a flow chart of a method for controlling the discharge of a hybrid electric vehicle according to Embodiment 6 of the present invention. On the basis of the foregoing embodiment, it exemplarily shows a system entering power generation and discharge from a battery discharge mode. The specific implementation of the mode.

With reference to Figure 1 and Figure 7, when the target discharge mode is the power generation and discharge mode, the discharge high-voltage power-on and external discharge are performed according to the target discharge mode, and the following steps are also included:

S601: Determine the target start mode according to the power battery state parameter.

Wherein, the target starting mode includes a driving motor starting method and a starter starting method. In the driving motor starting mode, the driving motor 10 is used to drive the engine 1 to complete the starting; in the starter starting mode, the driving motor 10 and the starter 2 are used to jointly drive the engine 1 to complete the starting.

S602: Control the drive motor to drive the engine to start running according to the starting mode of the driving motor, or control the driving motor and the starter to drive the engine to start running according to the starting mode of the starter.

S603: Determine whether the engine startup is completed.

If the starting of the engine 1 is completed, step S604 is performed; otherwise, the process returns to step S601.

S604: Execute discharge high voltage power-on and external discharge according to the power generation and discharge mode.

In the embodiment of the present invention, in the starting mode of the drive motor and the starting mode of the starter, the timing of the coupling of the C0 clutch 5 is different, and the hybrid control unit VCU can be used to calculate the operating conditions of the engine 1 and the drive motor 10, and select Target start-up mode that matches the operating conditions.

Specifically, controlling the drive motor 10 to drive the engine 1 to start running according to the drive motor starting method includes: the hybrid control unit VCU first enables the drive motor 10, the hybrid control unit VCU sends the enable to the motor control unit MCU, and the motor The control unit MCU feedbacks that the working state of the drive motor 10 is the torque mode; the hybrid control unit VCU controls the drive motor to work in the speed mode first, until the speed of the drive motor is maintained at the set speed (for example, 900rpm); The engine management unit EMS sends a start-up command, and sends a command to the transmission control unit TCU to control the C0 clutch 5 to be combined; as the drive motor 10 drives the engine 1 speed to increase, the hybrid control unit VCU sends fuel injection ignition to the engine management unit EMS. Command, the engine 1 injects fuel and ignites, and the hybrid control unit VCU sends the torque demand to the engine management unit EMS; if the engine management unit EMS reports that the torque exceeds the set value and the engine 1 reports the state as Start (Run), and the drive motor 10 torque is Negative value, the start-up is completed.

Controlling the drive motor 10 and the starter 2 to drive the engine 1 to start running according to the starting mode of the starter includes: the hybrid control unit VCU first enables the drive motor 10, the hybrid control unit VCU sends the enable to the motor control unit MCU, and the motor The control unit MCU feeds back that the working state of the drive motor 10 is the torque mode; the hybrid control unit VCU controls the drive motor 10 to work in the speed mode first, until the speed of the drive motor 10 is maintained at the set speed (for example, 900rpm); the hybrid control unit VCU sends start command, fuel injection command and speed command to engine management unit EMS, engine management unit EMS controls starter 2 to drive engine 1 to start, inject fuel to ignite, and responds to the speed of hybrid control unit VCU; The control unit VCU judges that the engine 1 has been started up (the state reported by the engine 1 is Run) and the difference between the speed of the engine 1 and the speed of the drive motor 10 is within a certain range, then the hybrid control unit VCU sends the C0 clutch 5 to the transmission control unit TCU. Combination command; after C0 clutch 5 is combined, the hybrid control unit VCU sends a torque command to the engine management unit EMS. If the engine management unit EMS feedbacks that the torque of the engine 1 exceeds the set value, and the torque of the drive motor 10 is negative, the engine will start. Finish. By setting a reasonable starting method, the starting efficiency is improved, and the reliability of the battery discharge mode entering the power generation discharge mode is improved.

Embodiment 7

Based on any of the above embodiments, the seventh embodiment of the present invention provides a hybrid vehicle discharge control device, the hybrid vehicle discharge control device can execute the hybrid vehicle discharge control method provided by any of the above embodiments, and has the ability to execute the above method. Desired functional modules and beneficial effects.

FIG. 8 is a schematic structural diagram of a hybrid vehicle discharge control device according to Embodiment 7 of the present invention.

As shown in FIG. 8 , the device 100 includes a collection unit 101 , a threshold value storage unit 102 , a discharge mode selection unit 103 and a discharge execution unit 104 .

The acquisition unit 101 is used to acquire system state parameters of the hybrid vehicle, the system state parameters include: vehicle power-on state, charging port connection state, transmission gear state, power battery state parameters, charger running state and fault detection parameters;

The threshold value storage unit 102 is configured to acquire a graded discharge threshold value parameter of the hybrid vehicle, where the graded discharge threshold value parameter includes: a first state threshold value and a second state threshold value, and the first state threshold value is higher than the second state threshold value;

a discharge mode selection unit 103, configured to compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result, and the target discharge mode includes a battery discharge mode and a power generation discharge mode;

The discharge execution unit 104 is configured to perform discharge high voltage power-on and external discharge according to the target discharge mode.

Optionally, the device further includes a system state parameter judgment unit, which is used for the discharge execution unit 104 to judge whether the system state parameter meets the preset power generation shutdown condition when the discharge high voltage power-on and power generation discharge are performed; the power generation shutdown execution unit is used for If it is judged that the system state parameters meet any of the preset power generation shutdown conditions, the power generation shutdown action is executed, and the preset power generation shutdown conditions include at least one of the following:

1) The power battery state parameter is higher than the first threshold state.

2) Any one of the engine, drive motor or clutch has a starting failure.

3) The connection status of the charging port is that the discharge gun is not connected or the connection of the discharge gun is abnormal.

4) The discharge gun has abnormal temperature failure.

5) There is an abnormal discharge fault in the high-voltage discharge circuit.

6) The charger sends out a request to unlock the electronic lock.

The power generation shutdown action includes: obtaining the torque feedback value of the engine, and issuing a clutch separation request according to the torque feedback value; obtaining the clutch separation state, and issuing a stop fuel injection request according to the separation state; obtaining the speed feedback value of the drive motor, and According to the speed feedback value, the stop motor enable signal is issued; according to the driving motor running state, the engine running state and the stop time, it is determined whether the stop is completed.

Optionally, the system state parameter judgment unit is also used for the discharge execution unit 104 to judge whether the system state parameter satisfies the preset discharge power-off condition when the discharge high-voltage power-on and external discharge are performed, and if the system state parameter satisfies the preset discharge power-off condition. If the power-off condition is satisfied, the power-off action is executed. The preset power-off condition includes at least one of the following:

1) The connection status of the charging port is that the charging port is not connected to the discharge gun or the discharge gun is abnormally connected.

2) The discharge gun has abnormal temperature failure.

3) The high-voltage discharge circuit has abnormal discharge and power-off faults.

4) The charger sends a request to unlock the electronic lock.

5) The power battery state parameter is lower than the difference between the second state threshold and the preset offset.

Optionally, the system state parameter judgment unit is also used for the discharge execution unit 104 to judge whether the system state parameter satisfies the preset discharge and power-on condition before executing the discharge high-voltage power-on, and if the system state parameter meets the preset discharge and power-on condition, execute the Discharge high voltage power-on and external discharge, the preset discharge power-on conditions include but are not limited to:

1) The power battery state parameter is higher than the first state threshold. Wherein, that the power battery state parameter is higher than the first state threshold includes: the power battery power is higher than the discharge power upper threshold, and the power battery discharge power is higher than the discharge power upper threshold.

2) The transmission gear status is P gear. The transmission gear state can be collected by the transmission control unit TCU and transmitted to the hybrid control unit VCU.

3) The connection status of the charging port is connected to the discharge gun.

4) Discharge fault signal is not detected. The discharge fault signal includes but is not limited to: abnormal temperature fault signal reported by the discharge gun and abnormal discharge fault in the high-voltage discharge circuit.

Optionally, the device further includes an engine starting control unit, which is used to determine the target starting mode according to the power battery state parameter; control the driving motor to drive the engine to start running according to the starting mode of the driving motor, or control the driving according to the starting mode of the starter. The motor and the starter drive the engine to start running; if the engine start-up is completed, the discharge execution unit 104 performs discharge high voltage power-on and external discharge according to the power generation and discharge mode.

Embodiment 8

The eighth embodiment of the present invention provides a hybrid vehicle. The hybrid vehicle is equipped with the hybrid vehicle discharge control device provided in the above embodiments, and can execute the hybrid vehicle discharge control method provided by any embodiment of the present invention, and has the execution method. Corresponding functional modules and beneficial effects.

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, and as long as the desired results of the technical solutions of the present invention can be achieved, no limitation is imposed herein.

The above-mentioned specific embodiments do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A method for controlling discharge of a hybrid vehicle, the hybrid vehicle comprising an engine, a drive motor, a starter, a two-way charger and a power battery, the engine and the drive motor being connected by a clutch, characterized in that, include: Acquiring system state parameters of the hybrid vehicle, where the system state parameters include: vehicle power-on state, charging port connection state, transmission gear state, power battery state parameters, charger running state, and fault detection parameters; Acquiring graded discharge threshold parameters of the hybrid vehicle, where the graded discharge threshold parameters include: a first state threshold and a second state threshold, the first state threshold being higher than the second state threshold; Comparing the power battery state parameter with the first state threshold and the second state threshold, and determining a target discharge mode according to the comparison result, where the target discharge mode includes a battery discharge mode and a power generation discharge mode; The discharge high voltage power-on and external discharge are performed according to the target discharge mode. 2. The method according to claim 1, wherein when the target discharge mode is the power generation and discharge mode, the method further comprises: judging whether the system state parameter satisfies the preset power generation shutdown condition; When the preset power generation shutdown condition is met, controlling the vehicle to perform a power generation shutdown action; The preset power generation shutdown condition includes at least one of the following: The power battery state parameter is higher than the first state threshold; Any one of the engine, the drive motor or the clutch has a startup failure; The connection state of the charging port is that the discharge gun is not connected or the discharge gun is abnormally connected; The discharge gun has abnormal temperature failure; There is an abnormal discharge fault in the high-voltage discharge circuit; Alternatively, the charger issues a request to unlock the electronic lock. 3. The method according to claim 2, wherein controlling the vehicle to perform a power generation shutdown action comprises: Obtain the torque feedback value of the engine, and issue a clutch disengagement request according to the torque feedback value; Acquire the disengagement state of the clutch, and issue a fuel injection stop request according to the disengagement state; Acquire the speed feedback value of the drive motor, and issue a stop motor enable signal according to the speed feedback value; It is determined whether the shutdown is completed according to the running state of the drive motor, the running state of the engine and the shutdown time. 4. The method according to claim 1, wherein when the target discharge mode is the battery discharge mode, the method further comprises: judging whether the system state parameter satisfies the preset discharge power-off condition; When the preset discharge power-off condition is met, controlling the vehicle to perform a discharge power-off action; The preset discharge power-off condition includes at least one of the following: The connection state of the charging port is that the charging port is not connected to the discharge gun or the discharge gun is abnormally connected; The discharge gun has abnormal temperature failure; The high-voltage discharge circuit has abnormal discharge and power-off fault; The charger sends a request to unlock the electronic lock; Alternatively, the power battery state parameter is lower than the difference between the second state threshold and a preset offset. 5. The method according to any one of claims 1-4, wherein, before performing discharge high voltage power-on according to the target discharge mode, the method comprises: judging whether the system state parameters meet the preset discharge and power-on conditions; Wherein, the preset discharge and power-on conditions include: The power battery state parameter is higher than the first state threshold; The transmission gear state is P gear; The connection state of the charging port is to connect the discharge gun; And, no discharge fault signal is detected. 6. The method according to any one of claims 1-4, wherein when the target discharge mode is the power generation and discharge mode, performing discharge high voltage power-on and external discharge according to the target discharge mode ,include: Determine a target starting mode according to the power battery state parameter, and the target starting mode includes a driving motor starting mode and a starter starting mode; Controlling the drive motor to drive the engine to start up and run according to the start-up mode of the drive motor; Alternatively, the drive motor and the starter are controlled to drive the engine to start running according to the starter starting mode. 7. The method according to any one of claims 1-4, wherein when the target discharge mode is the battery discharge mode, discharging high voltage power-on and external discharge are performed according to the target discharge mode ,include: The hybrid control unit is used to lock the battery discharge mode, and the lock protection includes: controlling the drive motor to be disabled, controlling the discharge gun to be in a locked state, prohibiting the response to the high-voltage request command while driving, and prohibiting the transmission from outputting P file; The bidirectional charger is controlled to operate in the discharge mode, and the output current of the bidirectional charger is determined according to the electric load parameter. 8. The method according to any one of claims 1-4, wherein the power battery state parameters include power battery power and/or power battery discharge power; The graded discharge threshold parameters include discharge power threshold parameters and/or discharge power threshold parameters. 9. A hybrid vehicle discharge control device, characterized in that, for executing the discharge control method according to any one of claims 1-8, the device comprises: The acquisition unit is used to acquire system state parameters of the hybrid vehicle, the system state parameters include: vehicle power-on state, charging port connection state, transmission gear state, power battery state parameters, charger running state and fault detection parameters ; a threshold storage unit, configured to acquire a graded discharge threshold parameter of the hybrid vehicle, where the graded discharge threshold parameter includes: a first state threshold and a second state threshold, the first state threshold being higher than the second state threshold; a discharge mode selection unit, configured to compare the power battery state parameter with the first state threshold and the second state threshold, and determine a target discharge mode according to the comparison result, where the target discharge mode includes a battery discharge mode and power generation and discharge mode; The discharge execution unit is configured to perform discharge high voltage power-on and external discharge according to the target discharge mode. 10 . A hybrid vehicle, comprising the hybrid vehicle discharge control device according to claim 9 . 11 .

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