CN102862471B - Charging device and charging method of hybrid car - Google Patents

Abstract

The invention provides a charging device for a hybrid electric vehicle, which is suitable for being electrically connected with a first and a second electric appliance. The charging device includes: a low-voltage storage battery; a high-voltage battery pack; Turning on the power supply of the low-voltage storage battery to the first electrical consumer is suitable for conducting the power supply of the low-voltage storage battery to the first and second electrical consumers in the second state; the second charging control module; the first charging The control module, when it is detected that the voltage of the low-voltage battery is lower than the predetermined battery voltage and the start switch is in the first state or the second state, and the second charging control module judges that the battery power of the high-voltage battery pack is not lower than the predetermined battery power, turn on all The high-voltage battery pack charges the low-voltage battery. The invention also provides a charging method for the hybrid electric vehicle. Using the charging device and the charging method provided by the present invention can avoid excessive use of the low-voltage storage battery, and even avoid irreversible damage.

Description

Hybrid electric vehicle charging device and charging method

technical field

The invention relates to a car charging device and a charging method thereof, in particular to a hybrid electric car charging device and a charging method thereof.

Background technique

When the vehicle is locked and stationary, the controllers still operate, and the required dark current can be provided by the low-voltage battery. The battery capacity of the low-voltage battery of a traditional car is generally larger. This is because the car needs a low-voltage battery to provide current to start the engine during the starting process. As the model becomes larger, the engine displacement is also larger, so the current required by the low-voltage battery is also larger. , taking the 12V lead-acid battery as an example for the low-voltage battery, the battery capacity of the general mini-car is between 32-45Ah, that of a small car is between 42-60Ah, that of a medium-to-high-end large-displacement car is generally between 60-90Ah, and that of a luxury type is generally between 32-45Ah. Large-displacement models even use batteries with a capacity of about 120Ah. However, since a hybrid electric vehicle is equipped with a high-voltage power battery pack and a drive motor, the high-voltage battery pack is used to provide current to the drive motor to start the engine directly during the start-up process, and the requirements for the starting current of the low-voltage battery are greatly reduced. The battery capacity of low-voltage batteries is generally small, but since hybrid vehicles have more controllers and electronic devices than traditional vehicles, when the vehicle is locked and stationary, the dark current required to run each controller is higher than the current required by conventional vehicles. big.

Sometimes after entering the car, the user will turn on the DVD, cigarette lighter and other equipment even though he does not start the engine. These equipment will also consume the capacity of the low-voltage battery during use.

In the prior art, the low-voltage battery is generally charged through the battery management system to detect whether the low-voltage battery needs to be charged. For example, the publication number is CN 101916888A, and the name is a patent application for intelligent charging and equalization method and device for power batteries of hybrid and pure electric vehicles. public documents. However, when the car is locked, the battery management system is in a power-off state and cannot detect whether the low-voltage battery needs to be charged. In this case, when the user parks the vehicle in the garage for a week or even a month, the low-voltage battery on the car will be completely emptied, making it impossible for the user to start the vehicle smoothly when entering the car. More seriously, if the effective capacity of the low-voltage battery Continuing to place it after discharging may cause irreversible damage to the low-voltage battery.

In view of this, it is necessary to propose a charging device and method for hybrid electric vehicles to avoid excessive use of low-voltage batteries, and even avoid irreversible damage.

Contents of the invention

The problem to be solved by the present invention is to provide a charging device and charging method for a hybrid electric vehicle, so as to avoid excessive use of the low-voltage storage battery, and even avoid irreversible damage.

In order to solve the above problems, the present invention provides a charging device for hybrid electric vehicles, which is suitable for electrical connection with the first electrical appliance and the second electrical appliance. The charging device includes:

low-voltage battery;

High voltage battery pack;

A start switch, the start switch has at least two states, wherein, in the first state, it is suitable for turning on the power supply of the low-voltage battery to the first consumer, and in the second state, it is suitable for turning on the power supply of the low-voltage battery to the power supply of said first and second electrical consumers;

The second charging control module is suitable for detecting the battery power of the high-voltage battery pack;

The first charging control module is used to detect the voltage of the low-voltage battery, when it is detected that the voltage of the low-voltage battery is lower than the predetermined battery voltage and the start switch is in the first state or the second state and the second charging control module judges the high-voltage battery pack When the electric quantity of the battery is not lower than the predetermined electric quantity of the battery, the circuit for charging the low-voltage storage battery by the high-voltage battery pack is turned on.

Optionally, the charging device further includes: an engine, adapted to be started under the control of the second charging control module when the battery power of the high-voltage battery pack is lower than a predetermined battery power, and the engine charges the high-voltage battery pack .

Optionally, the charging device further includes: a DC step-down module, which is adapted to convert the high-voltage direct current of the high-voltage battery pack into low-voltage direct current to charge the low-voltage storage battery.

Optionally, the charging device also includes:

An electric drive module, configured to control enabling of the DC step-down module;

The second switch is adapted to turn on the power supply of the low-voltage battery to the electric drive module;

The vehicle management unit is used to control the opening and closing of the second switch.

Optionally, the first charging control module is a keyless start module, and the charging device further includes:

a first switch, configured to turn on the power supply from the low-voltage battery to the keyless start module;

The vehicle body management unit is used to control the opening and closing of the first switch.

Optionally, the first charging control module is a keyless start module, and the charging device further includes: a key chip.

Optionally, the first charging control module is a keyless start module, and the charging device further includes:

The third switch is connected to the keyless start module and is used to turn on or off the power supply from the low-voltage battery to the first consumer;

A fourth switch, connected to the keyless start module, is used to turn on or off the power supply from the low-voltage battery to the first and second electrical consumers.

Optionally, the second charging control module is a vehicle management unit.

Optionally, the start switch also has a third state of being in an off state.

Optionally, the first electrical consumer is an electrical consumer not necessary for driving, and the second electrical consumer is an electrical consumer necessary for driving.

The present invention also provides a charging method for a charging device, which is characterized in that it includes the following steps:

The first charging control module detects the voltage of the low-voltage storage battery;

When it is detected that the voltage of the low-voltage battery is lower than the predetermined battery voltage and the start switch is in the first state or the second state, the second charging control module judges whether the battery power of the high-voltage battery pack is lower than the predetermined battery power; The first state is suitable for turning on the power supply of the low-voltage battery to the first consumer, and the second state is suitable for turning on the power supply of the low-voltage battery to the first and second consumers;

If not, the first charging control module turns on the circuit for charging the low-voltage battery by the high-voltage battery pack;

In the process of charging the low-voltage storage battery, the second charging control module judges whether the battery power of the high-voltage battery pack is lower than a predetermined battery power.

Optionally, if the battery power of the high-voltage battery pack is lower than the predetermined battery power, the second charging control module controls the engine to start to charge the high-voltage battery pack; during the charging process of the high-voltage battery pack, the The first charging control module turns on the circuit for charging the low-voltage storage battery by the high-voltage battery pack.

Optionally, the first charging control module turns on the high-voltage battery pack to charge the low-voltage storage battery through a DC step-down module.

Optionally, the first charging control module is a keyless start module, and the charging method further includes: after the vehicle body management unit detects that the left front door is opened, controlling the first switch to be closed so that the low-voltage battery is charged to the keyless start The power supply of the module is turned on, and the keyless start module detects the voltage of the low-voltage battery at a first frequency when the keyless start module is powered on.

Optionally, the first charging control module is a keyless start module, and the circuit that the first charging control module turns on the high-voltage battery pack to charge the low-voltage battery includes:

The keyless start module sends a charging request to the vehicle management unit;

The vehicle management unit controls the second switch to be closed, so that the power supply of the low-voltage battery to the electric drive module is turned on;

When the electric drive module is powered on, it sends an enabling signal to the DC step-down module.

Optionally, the first charging control module is a keyless start module, and when it is detected that the voltage of the low-voltage battery is lower than a predetermined battery voltage and the start switch is in the first state or the second state, the charging method further It includes: the keyless start module detects and verifies the signal of the key chip, and after the verification is passed, the second charging control module starts to judge whether the battery power of the high-voltage battery pack is lower than a predetermined battery power.

Compared with the prior art, the present invention has the following advantages: when the charging device is adopted on the hybrid electric vehicle, when the voltage of the low-voltage storage battery is lower than the predetermined battery voltage and the starting switch is in the first state or the second state, that is, the automobile is in use During the process, the low-voltage battery needs to be charged; the first charging control module turns on the circuit that the high-voltage battery pack charges the low-voltage battery through the DC step-down module, and at the same time, in order to protect the high-voltage battery pack, Before charging the low-voltage battery, the second charging control module needs to be used to detect whether the battery power of the high-voltage battery pack is lower than the predetermined battery power; if the high-voltage battery pack is fully charged, the circuit for charging the low-voltage battery is turned on; If the battery is charged, it is necessary to start the engine, charge the high-voltage battery first, and charge the low-voltage battery at the same time as the high-voltage battery. When the second charging control module detects that the battery power of the high-voltage battery is not lower than the predetermined When the battery capacity is low, disconnect the charging device for the high-voltage battery pack to complete the charging of the high-voltage battery pack; when the first charging control module detects that the battery voltage of the low-voltage battery is not lower than the predetermined battery voltage, disconnect the low-voltage battery pack. The battery charging device completes the charging of the low-voltage battery, which can avoid excessive use of the low-voltage battery, and even avoid irreversible damage.

Description of drawings

Fig. 1 is a schematic diagram of a charging device for a hybrid electric vehicle provided by the present invention;

Fig. 2 is a schematic diagram of a charging device for a hybrid electric vehicle provided by a specific embodiment of the present invention;

Fig. 3 is a flowchart of a charging method corresponding to a charging device for a hybrid electric vehicle provided by a specific embodiment of the present invention.

Detailed ways

In order to avoid excessive use of low-voltage batteries, or even avoid irreversible damage, the present invention provides a charging device 2 for hybrid electric vehicles, which is suitable for electrical connection with the first electrical appliance 31 and the second electrical appliance 32. The charging device 2 includes :

Low-voltage battery 41;

High voltage battery pack 42;

Start switch 43, the start switch 43 has at least two states, wherein, in the first state, it is suitable for turning on the power supply of the low-voltage storage battery 41 to the first electrical consumer 31, and in the second state, it is suitable for turning on the The low-voltage storage battery 41 supplies power to the first and second electrical consumers 31, 32;

The second charging control module 44 is adapted to detect the battery power of the high-voltage battery pack 42;

The first charging control module 45 is used to detect the voltage of the low-voltage storage battery 41, when it is detected that the voltage of the low-voltage storage battery 41 is lower than the predetermined battery voltage and the start switch 43 is in the first state or the second state and the second charging control module 44 When judging that the battery power of the high-voltage battery pack 42 is not lower than the predetermined battery power, turn on the circuit for charging the low-voltage battery 41 by the high-voltage battery pack 42 .

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 2 is a specific embodiment of the hybrid electric vehicle charging device provided by the present invention, the charging device 1 is suitable for being electrically connected with the first electrical appliance 31 and the second electrical appliance 32, and the charging device 1 includes:

Low-voltage battery 11;

High voltage battery pack 12;

A first charging control module 13, the first charging control module 13 is adapted to detect the voltage of the low-voltage storage battery 11;

The start switch 14, the start switch 14 can have three states, wherein, in the first state, it is suitable for conducting the low-voltage battery 11 and the first consumer 31, and the first consumer 31 is not necessary for driving. prepared electrical appliances, such as DVD, cigarette lighter, etc., that is: the first state is ACC; 32 is an electrical appliance necessary for driving, such as a driving instrument, an electric steering system, an airbag, etc., that is, the second state is the ON gear; in the third state, it is in the OFF state, that is, the third state is the OFF gear;

A second charging control module, the second charging control module is suitable for detecting the battery power of the high-voltage battery pack 12;

engine 21.

In a specific implementation process, the charging device 1 also includes:

A DC step-down module 15, the DC step-down module 15 is suitable for converting the high-voltage direct current of the high-voltage battery pack 12 into a low-voltage direct current to charge the low-voltage storage battery 11;

An electric drive module 16, configured to control enabling of the DC step-down module 15;

The second relay 17 is adapted to turn on the power supply of the low-voltage storage battery 11 to the electric drive module 16;

The vehicle management unit 18 is used to control the opening and closing of the second relay 17 .

In this embodiment, in order to integrate the functions of each module, the first charging control module 13 is a keyless start module 13', and the charging device 1 further includes:

The first relay 19 is adapted to conduct the power supply from the low-voltage storage battery 11 to the keyless start module 13';

a vehicle body management unit 20, configured to control opening and closing of the first relay 19;

key chip 33;

The third relay 34 is connected to the keyless start module 13', and is used to turn on or off the power supply from the low-voltage storage battery 11 to the first electrical consumer 31;

The fourth relay 35 is connected to the keyless start module 13', and is used to turn on or off the power supply from the low-voltage storage battery 11 to the first and second electrical consumers 32.

In a specific implementation process, the first, second, third and fourth relays 19, 17, 34, 35 can all be configured as other types of switches.

In this embodiment, the second charging control module is the vehicle management unit 18 .

It should be noted that the first charging control module 13 can also be other modules except the keyless start module 13 ′, for example, for a car that is not equipped with a keyless entry system and can only be entered by mechanical unlocking, the The first charging control module 13 can be a vehicle control unit. At this time, the first relay 19, the vehicle body management unit 20, the key chip 33, the third relay 34, and the fourth relay 35 are not necessary components in the charging device.

Corresponding to the hybrid electric vehicle charging device provided by the embodiment of the present invention in FIG. 2 , FIG. 3 is a schematic flowchart of a hybrid electric vehicle charging method provided by the embodiment of the present invention.

Execute step S21, after the vehicle body management unit 20 detects that the left front door is opened, it controls the first relay 19 to close; the power supply from the low-voltage battery 11 to the keyless start module 13' is turned on.

The purpose of this step is to detect whether a driver enters. If the driver's seat of the hybrid electric vehicle is set at the right front position, this step detects whether the right front door is opened accordingly.

Step S22 is executed, the keyless start module 13' detects the voltage of the low-voltage battery 11 at a first frequency.

The first frequency may be on the order of milliseconds.

Execute step S23, when it is detected that the voltage of the low-voltage battery 11 is lower than the predetermined battery voltage and the start switch 14 is in the first state or the second state, the keyless start module 13' sends a message to the vehicle management unit 18 Make a charge request. When it is detected that the voltage of the low-voltage battery 11 is not lower than the predetermined battery voltage or the start switch 14 is not in the first state or the second state, the keyless start module 13' continues to detect, that is, still executes step S22 .

In the detection process, the keyless start module 13' can directly detect the voltage of the low-voltage battery 11 and the state of the start switch 15, or the keyless start module 13' can obtain the voltage of the low-voltage battery 11 and the state of the start switch 15 through the control bus. status.

In this step, when the start switch 14 is in the first state and is detected by the keyless start module 13', the keyless start module 13' controls the third relay 34 to close, so that the start switch 14 Whether it is in the first state can also be obtained by judging whether the third relay 34 is closed. Similarly, when the start switch 14 is in the second state, the keyless start module 13' controls the fourth relay 35 to close, and an alternative solution for judging whether the start switch 14 is in the second state is to judge whether the start switch 14 is in the second state. Whether the four relays 35 are closed.

Execute step 24, the keyless start module 13' detects the signal of the key chip 33, and performs verification after detection, and when it is verified that the key chip 33 is in the vehicle, execute step S25.

Since the general key chip 33 is carried by the driver at any time, this step can avoid that after the driver starts the car, DVD and other equipment are in use, and the driver leaves the vehicle, the charging of the low-voltage battery 11 is started at this time, and even the high-voltage battery Unsafe factors caused by charging being activated.

An alternative to detecting and verifying the key chip 33 in this step may be to install a pressure sensor on the left front driver's seat. When the pressure transmitted by the pressure sensor is greater than a certain threshold, step S25 is executed. Correspondingly, when the driver's seat is arranged at the right front, a pressure sensor is installed on the right front driver's seat.

Step S25 is executed, and the vehicle management unit 18 starts to detect whether the battery power of the high-voltage battery pack 12 is lower than a predetermined battery power.

If the electric quantity of the high-voltage battery pack 12 is not lower than the predetermined battery electric quantity, step S26 is executed, and the vehicle management unit 18 controls the second relay 17 to close, so that the low-voltage battery 11 is connected to the electric drive module 16. The power supply is turned on.

Step S27 is executed, when the electric drive module 16 is powered on, it sends an enable signal to the DC step-down module 15.

Execute step S28, the circuit for charging the low-voltage battery 11 by the high-voltage battery pack 12 through the DC step-down module 15 is turned on, and starts charging the low-voltage battery 11, and the charging process will make the low-voltage storage battery 11 11, the charging process of the low-voltage battery 11 ends when the keyless start module 13' detects that the voltage of the low-voltage battery 11 is not lower than a predetermined battery voltage.

If the power of the high-voltage battery pack 12 is lower than the predetermined battery power, step S26' is executed, and the second charging control module (that is: the vehicle management unit 18) controls the engine 21 to start, and the high-voltage battery pack 12 Charging, when the second charging control module detects that the battery power of the high-voltage battery pack 12 is not lower than a predetermined battery power, disconnect the charging of the high-voltage battery pack 12;

During the execution of step S26', steps S26-S28 are executed.

In the process of executing step S28, it is also necessary to execute step S281. The vehicle management unit 18 judges whether the battery power of the high-voltage battery pack 12 is lower than the predetermined battery power at a second frequency. If it is detected that the battery power is not lower, continue to execute S28, when it is detected that the value is lower than that, execute step S26'. The second frequency is on the order of milliseconds.

The first frequency of detecting the voltage of the low-voltage battery and the second frequency of detecting the predetermined battery capacity of the high-voltage battery pack of the hybrid electric vehicle can be preset.

It should be noted that when the first charging control module 13 is a module other than the keyless start module 13', steps S21, S23-S24 in the charging method shown in Fig. 3 are unnecessary steps. In the specific implementation process, the vehicle management unit 18 can also supply power to the second electrical appliance 32, and when the step S23 is completed, the keyless start module 13' sends a charging request to the vehicle management unit 18 , the vehicle management unit 18 judges whether the second electrical appliance 32 is working normally, such as whether the driving instrument data display is normal, whether the electric steering system is normal, whether the airbag can be opened normally, and if the second electrical appliance 32 is working normally, execute S24 and subsequent steps. This can make the whole vehicle no longer need to step on the brake pedal and press the start switch, and can drive at any time during the charging process.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the methods disclosed above and technical content to analyze the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made in the technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention, which do not depart from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.

Claims (15)

1. A charging device for a hybrid electric vehicle, suitable for being electrically connected with a first electrical appliance and a second electrical appliance, the charging device comprising: low-voltage battery; High voltage battery pack; A start switch, the start switch has at least two states, wherein, in the first state, it is suitable for turning on the power supply of the low-voltage battery to the first consumer, and in the second state, it is suitable for turning on the power supply of the low-voltage battery to the power supply of said first and second electrical consumers; The second charging control module is suitable for detecting the battery power of the high-voltage battery pack; The first charging control module is used to detect the voltage of the low-voltage battery, when it is detected that the voltage of the low-voltage battery is lower than the predetermined battery voltage and the start switch is in the first state or the second state and the second charging control module judges the high-voltage battery pack When the battery power is not lower than the predetermined battery power, turn on the circuit for charging the low-voltage battery by the high-voltage battery pack; Wherein, the first charging control module is a keyless start module, and the charging device further includes: a key chip. 2. The charging device according to claim 1, characterized in that, the charging device further comprises: a motor, adapted to be powered by the second charging control module when the battery power of the high-voltage battery pack is lower than a predetermined battery power. When started, the engine charges the high-voltage battery pack. 3. The charging device according to claim 1 or 2, characterized in that, the charging device further comprises: a DC step-down module, the DC step-down module is adapted to convert the high-voltage direct current of the high-voltage battery pack into a low-voltage direct current to charge the low voltage battery. 4. The charging device according to claim 3, further comprising: An electric drive module, configured to control enabling of the DC step-down module; The second switch is adapted to turn on the power supply of the low-voltage battery to the electric drive module; The vehicle management unit is used to control the opening and closing of the second switch. 5. The charging device according to claim 1 or 2, characterized in that the charging device further comprises: a first switch, configured to turn on the power supply from the low-voltage battery to the keyless start module; The vehicle body management unit is used to control the opening and closing of the first switch. 6. The charging device according to claim 1 or 2, characterized in that, the charging device further comprises: The third switch is connected to the keyless start module and is used to turn on or off the power supply from the low-voltage battery to the first consumer; A fourth switch, connected to the keyless start module, is used to turn on or off the power supply from the low-voltage battery to the first and second electrical consumers. 7. The charging device according to claim 1 or 2, wherein the second charging control module is a vehicle management unit. 8. The charging device according to claim 1 or 2, wherein the activation switch further has a third state of being in an off state. 9. The charging device according to claim 1 or 2, wherein the first electrical consumer is an electrical consumer not necessary for driving, and the second electrical consumer is an electrical consumer necessary for driving. 10. The method for charging a charging device according to claim 1, characterized in that it comprises the following steps: The first charging control module detects the voltage of the low-voltage storage battery; When it is detected that the voltage of the low-voltage battery is lower than the predetermined battery voltage and the start switch is in the first state or the second state, the second charging control module judges whether the battery power of the high-voltage battery pack is lower than the predetermined battery power; The first state is suitable for turning on the power supply of the low-voltage battery to the first consumer, and the second state is suitable for turning on the power supply of the low-voltage battery to the first and second consumers; If not, the first charging control module turns on the circuit for charging the low-voltage battery by the high-voltage battery pack; In the process of charging the low-voltage storage battery, the second charging control module judges whether the battery power of the high-voltage battery pack is lower than a predetermined battery power. 11. The charging method according to claim 10, characterized in that, if the battery power of the high-voltage battery pack is lower than a predetermined battery power, the second charging control module controls the engine to start to charge the high-voltage battery pack; In the process of charging the high-voltage battery pack, the first charging control module turns on the circuit for charging the low-voltage storage battery by the high-voltage battery pack. 12. The charging method according to claim 10 or 11, characterized in that the first charging control module turns on the high-voltage battery pack to charge the low-voltage storage battery through a DC step-down module. 13. The charging method according to claim 10 or 11, characterized in that the charging method further comprises: after the vehicle body management unit detects that the left front door is opened, controlling the first switch to be closed so that the low-voltage battery charges to the keyless The power supply of the starting module is turned on, and the keyless starting module detects the voltage of the low-voltage storage battery at a first frequency when the keyless starting module is powered on. 14. The charging method according to claim 10 or 11, wherein the first charging control module turns on the circuit for charging the low-voltage battery by the high-voltage battery pack comprising: The keyless start module sends a charging request to the vehicle management unit; The vehicle management unit controls the second switch to be closed, so that the power supply of the low-voltage battery to the electric drive module is turned on; When the electric drive module is powered on, it sends an enabling signal to the DC step-down module. 15. The charging method according to claim 10 or 11, characterized in that, when it is detected that the voltage of the low-voltage storage battery is lower than a predetermined battery voltage and the start switch is in the first state or the second state, the charging method It also includes: the keyless start module detects and verifies the signal of the key chip, and after the verification is passed, the second charging control module starts to judge whether the battery power of the high-voltage battery pack is lower than a predetermined battery power.