CN115709705A - Brake boosting method and device and vehicle - Google Patents

Abstract

The embodiment of the invention discloses a brake boosting method, a brake boosting device and a vehicle, wherein the method comprises the steps that an integrated brake control system obtains brake data of the vehicle to be controlled; the brake boosting system determines a target braking demand of a driver based on the braking data; the integrated brake control system reads the current brake request of the vehicle to be controlled; the brake boosting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled; the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request. According to the application, the integrated brake control system is used for collecting the brake data of the vehicle to be controlled, the brake boosting system judges the brake intention of the driver based on the brake data, and brake boosting pressure is generated according to the brake intention of the driver and the vehicle brake request, so that the technical effect of improving the brake boosting stability is achieved.

Description

Brake boosting method, device and vehicle

technical field

The embodiments of the present invention relate to the technical field of brake boosting, in particular to a brake boosting method, device and vehicle.

Background technique

Passenger cars currently on the market are all equipped with a brake booster device, and the driver can use a small force to amplify the booster to generate a larger braking force to make the vehicle stop smoothly.

At present, the brake booster device of fuel vehicles on the market mainly completes the auxiliary brake boosting work by detecting the change of the brake fluid pressure of the master cylinder through the controller. This method of assisting power assist is only used when the brake fluid pressure changes rapidly or is particularly obvious, that is, it will work when braking at high speed. In daily working conditions, this kind of auxiliary power is very unstable, and the brake booster device of fuel vehicles cannot meet the needs of more users in the market. The brake booster device of new energy vehicles usually uses the motor to reverse the braking energy to complete the auxiliary boost, and its stability is also low, which affects the auxiliary brake boost.

Contents of the invention

The embodiment of the present invention provides a brake boosting method, device and vehicle, which solves the problems existing in the prior art when performing auxiliary braking by detecting the change of the brake fluid pressure of the master cylinder or using the method of reversing the motor to recover the braking capacity. The technical problem of the low stability of the brake booster.

An embodiment of the present invention provides a brake boosting method. When the driver of the vehicle to be controlled depresses the brake pedal, the brake boosting method includes:

The integrated braking control system obtains the braking data of the vehicle to be controlled, wherein the braking data includes push rod displacement, master cylinder pressure and brake pedal signal;

a brake booster system determines a target braking demand of the driver based on the braking data;

The integrated braking control system reads the current braking request of the vehicle to be controlled, wherein the current braking request includes at least one of the following: pedal braking request, active emergency braking system request, braking anti- Locking system request, vehicle dynamic braking request, external braking request and electronic parking system request;

The brake booster system determines the vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working condition of the vehicle to be controlled;

The brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.

Further, before the brake boosting system determines the brake boosting pressure of the vehicle to be controlled, the brake boosting method further includes:

The brake booster system obtains the current working state of the integrated brake control system;

The brake booster system judges the failure level of the integrated brake control system based on the current working state of the integrated brake control system;

The brake boost system determines a corresponding brake boost pressure generation mode based on a fault level of the integrated brake control system.

Further, the brake assist system judging the failure level of the integrated brake control system based on the current working state of the integrated brake control system includes:

If the integrated braking control system has no faults, the fault level of the integrated braking control system is level one;

If the pedal stroke sensor of the integrated braking control system fails, the failure level of the integrated braking control system is level two;

If the master cylinder pressure sensor of the integrated braking control system fails or the oil tank liquid level sensor fails, the failure level of the integrated braking control system is three;

If all faults of the integrated braking control system fail, the fault level of the integrated braking control system is level four.

Further, the brake boosting pressure generation modes include full-function mode, pedal feel degradation mode, alternate pressure build-up mode, single-pipeline pressure build-up mode and mechanical backup mode, and the brake booster system is based on the integrated braking The fault level of the control system determines the corresponding brake boost pressure generation mode including:

When the fault level of the integrated brake control system is level one, the brake booster pressure generation mode of the brake booster system adopts a full-function mode;

When the failure level of the integrated brake control system is level two, the brake boost pressure generation mode of the brake booster system adopts the pedal feel degraded mode;

When the failure level of the integrated brake control system is level three, the brake booster pressure generation mode of the brake booster system adopts the alternate pressure build-up mode or the single-pipeline pressure build-up mode;

When the failure level of the integrated brake control system is level four, the brake booster pressure generation mode of the brake booster system adopts a mechanical backup mode.

Further, the brake boosting system determining the driver's target braking demand based on the braking data includes:

The brake booster system uses the brake pedal signal to simulate a pedal feel signal;

The brake booster system uses the pedal feel signal, the push rod displacement and the master cylinder pressure to determine the driver's target braking demand through simulation.

Further, before determining the vehicle braking request of the vehicle to be controlled, the brake boosting method further includes:

Prioritize the read current braking requests by using a preset priority order, wherein the preset priority order includes: the pedal brake request is the first priority, and the active emergency brake The braking system request, the braking anti-lock braking system request and the vehicle dynamic braking request are all of the second priority, the external braking request is of the third priority, and the electronic parking system request is of the fourth priority. priority.

Further, the brake boosting system determining the vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working condition of the vehicle to be controlled includes:

The brake boosting system determines the vehicle braking request of the vehicle to be controlled based on the priority ranking of the current braking requests and the current actual working condition of the vehicle to be controlled.

Further, after the brake boosting pressure of the vehicle to be controlled is determined to be obtained, the brake boosting method further includes:

The brake booster system adjusts the amount of brake fluid in and out of the integrated brake control system based on the brake booster pressure;

The integrated brake control system controls the vehicle to be controlled to perform braking by using the adjusted brake fluid inflow and outflow.

An embodiment of the present invention also provides a brake booster device, the brake booster device comprising:

An integrated braking control system, used to obtain braking data of the vehicle to be controlled when the driver of the vehicle to be controlled depresses the brake pedal, wherein the braking data includes push rod displacement, master cylinder pressure and Brake pedal signal;

a brake boosting system for determining a target braking demand of the driver based on the braking data;

The integrated braking control system is also used to read the current braking request of the vehicle to be controlled, wherein the current braking request includes at least one of the following: pedal braking request, active emergency braking system request, Brake anti-lock braking system request, vehicle dynamic braking request, external braking request and electronic parking system request;

The brake booster system is further configured to determine a vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working condition of the vehicle to be controlled;

The brake boosting system is also used to determine the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.

An embodiment of the present invention also provides a vehicle, which includes the brake booster device described in any of the above embodiments.

The embodiment of the present invention discloses a brake boosting method, device and vehicle. The method includes an integrated brake control system acquiring braking data of the vehicle to be controlled; the brake boosting system determines the driver's target braking demand based on the braking data ; The integrated brake control system reads the current braking request of the vehicle to be controlled; the brake booster system determines the vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working conditions of the vehicle to be controlled; the brake booster system The brake assist pressure of the vehicle to be controlled is determined based on the target braking demand and the vehicle braking request. This application collects the braking data of the vehicle to be controlled through the integrated braking control system. The brake booster system judges the driver's braking intention based on the braking data, and generates braking according to the driver's braking intention and the vehicle braking request. The boost pressure solves the technical problem of low stability of the brake booster that exists in the prior art when assisting braking by detecting the change of the brake fluid pressure of the master cylinder or using the method of reversing the motor to recover the braking capacity, and realizes The technical effect of improving the stability of the brake booster is obtained.

Description of drawings

FIG. 1 is a flowchart of a brake boosting method provided by an embodiment of the present invention;

Fig. 2 is a structural diagram of an integrated brake control system and a brake booster system provided by an embodiment of the present invention;

Fig. 3 is a flowchart of another brake boosting method provided by an embodiment of the present invention;

Fig. 4 is a hydraulic schematic diagram of the full-function mode provided by the embodiment of the present invention;

Fig. 5 is a structural diagram of a brake booster device provided by an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present invention are used to distinguish different objects, rather than to limit a specific order. The following embodiments of the present invention may be implemented independently, or may be implemented in combination with each other, which is not specifically limited in the embodiments of the present invention.

Fig. 1 is a flowchart of a brake boosting method provided by an embodiment of the present invention.

As shown in Figure 1, when the driver of the vehicle to be controlled depresses the brake pedal, the brake boosting method specifically includes the following steps:

S101, the integrated braking control system acquires braking data of the vehicle to be controlled, wherein the braking data includes push rod displacement, master cylinder pressure and brake pedal signal.

Specifically, when the driver depresses the brake pedal, the system automatically closes the two pressure building simulation valves PSV1 and PSV2 (Plunger Simulation Valve, pressure building simulation valve), and at the same time isolates the master cylinder and wheel cylinder hydraulic oil circuit, integrated system The dynamic control system measures the displacement of the push rod of the master cylinder through the displacement sensor, measures the pressure of the master cylinder through the pressure sensor of the master cylinder, and obtains the signal of the brake pedal through the pedal travel sensor.

Fig. 2 is a structural diagram of the integrated brake control system and brake booster system provided by the embodiment of the present invention. Referring to Fig. 2, multiple sensors are set on the vehicle to be controlled, including wheel speed sensors, displacement sensors, master cylinder Cylinder pressure sensor, PTS (Pedal Travel Sensor, pedal stroke sensor) sensor, oil tank liquid level sensor and motor position sensor, among the above-mentioned multiple sensors, except the wheel speed sensor is connected with the steering knuckle of the vehicle to be controlled, other sensors are It is mechanically connected with the integrated brake control system (Integrated brake control system, IBC), and at the same time, the integrated brake control system is electrically connected with the brake booster system. After the controller in the integrated brake control system acquires the corresponding braking data through various sensors, it transmits the braking data to the brake booster system.

Referring to Figure 2, the vehicle to be controlled will provide power to the integrated braking control system, and will send a braking demand signal to the integrated braking control system when the vehicle to be controlled needs to brake.

S102, the brake assist system determines the driver's target braking demand based on the braking data.

Optionally, S102 specifically includes: the brake booster system uses the brake pedal signal simulation to obtain the pedal feel signal; the brake booster system uses the pedal feel signal, push rod displacement and master cylinder pressure to determine the driver's target braking through simulation. need.

Specifically, the brake boosting system has a brake boosting function (Brake Boost Function, BBF). As shown in FIG. The gateway is connected to the combination meter, among which, the communication connection between the brake booster system and the gateway, and between the gateway and the combination meter are realized through the CAN line. The combination meter refers to the instrument panel set in the cab of the vehicle to be controlled. Various data information of the power assist system can be displayed to the driver through the instrument cluster.

After the brake booster system receives the braking data, the pedal feeling simulator (Padel Feeling Simulator, PFS) set in the brake booster system will use the brake pedal signal to simulate the pedal feel signal to realize the driver's braking process. The simulation of the brake pedal feel, and then use the pedal feel signal, push rod displacement and master cylinder pressure to simulate the driver's target braking demand through the preset brake pressure simulation model, that is, the driver's braking intention. Among them, the preset brake pressure simulation model is pre-built through the simulink module in Matlab software.

S103, the integrated braking control system reads the current braking request of the vehicle to be controlled, wherein the current braking request includes at least one of the following: pedal braking request, active emergency braking system request, brake anti-lock braking system request , vehicle dynamic braking request, external braking request and electronic parking system request.

Specifically, in order to make the determined brake boosting pressure more accurate, it is also necessary to obtain the current braking request of the vehicle to be controlled. Brake signal; active emergency braking system request means that the active emergency braking system (Autonomous Emergency Braking, AEB) vehicle is driving normally under the condition of non-adaptive cruise control, if the vehicle encounters a sudden dangerous situation or collides with the vehicle in front and pedestrians The brake signal issued by active braking when the distance is less than the safety distance; the brake anti-lock braking system request refers to the brake signal issued by the brake anti-lock brake system (Antilock Brake System, ABS); the vehicle dynamic brake request refers to The braking signal sent by the vehicle dynamics control system (Vehicle Dynamics Control, VDC), including the anti-rolling signal; the external braking request refers to the cruise control system or the parking assist system sent to the integrated braking control system braking signal, among them, the cruise control system includes driver auxiliary deceleration control-stop control (Driver Auxiliary Deceleration Control-Stop Control, CDD-S); the electronic parking system request refers to the electronic parking brake system (Electrical Park Brake, the brake signal issued by EPB).

S104, the brake boosting system determines the vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working condition of the vehicle to be controlled.

Specifically, after obtaining the current braking request of the vehicle to be controlled, the brake booster system will also obtain the current actual working conditions of the vehicle to be controlled. Specifically, the current actual working conditions include at least the current driving speed, The driving road condition of the vehicle to be controlled and the current driving environment of the vehicle to be controlled, wherein the current driving environment may be the current temperature state, humidity state, weather state, etc. After the current actual working condition is obtained, the vehicle braking request of the vehicle to be controlled is determined by combining the current braking request and the current actual working condition.

It should be noted that if the current braking request includes more than one type, the brake booster system will sort the current braking requests according to the preset priority order, and then combine the current braking request with the highest priority with the current actual working condition The braking request issued by the vehicle is arbitrated, and the vehicle braking request of the vehicle to be controlled is finally determined.

S105, the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.

Specifically, after determining the vehicle braking request of the vehicle to be controlled, the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request, and then the brake boosting system The built-in cylinder pressure control system controls the action of the motor and the solenoid valve actuator to generate the required target pressure (ie, the above-mentioned brake booster pressure) in the wheel cylinder.

Specifically, the brake booster system pressurizes the four-wheel calipers according to the maximum target pressure calibrated by the two curves of "deceleration-pedal displacement" and "deceleration-pedal force" according to the target braking demand and vehicle braking request. , to generate braking force, so that the whole vehicle can achieve the purpose of braking and deceleration, to ensure the stability of the auxiliary booster, and to protect the safety of the driver and passengers when the brake booster fails at high speed. Wherein, the pedal displacement is the displacement of the push rod in the braking data, and the pedal force is the master cylinder pressure in the braking data.

It should be noted that the brake booster system can work normally only under the following conditions, that is, the performance design standard can be reached within the following boundary range, and the performance of the brake booster system cannot be guaranteed beyond this boundary range. The specific boundary conditions are as follows: (1) The brake booster system is available in the full vehicle speed range; (2) The installation of the integrated brake control system on the vehicle firewall should meet the requirements of the X-axis, Y-axis, push rod swing, and mounting bolts. Installation requirements; (3) The working durability of the brake booster system is within the specified design life, or 8,000 hours of Ignition On (ignition), or 300,000 kilometers of mileage, or 2,200,000 times of braking (whichever comes first); ( 4) The power supply voltage (connector end) of the integrated brake control system required for the normal operation of the brake booster system should be between 10V and 16V; (5) The brake booster system is related to the integrated brake control system when it is working The hydraulic pipelines and brakes are free from leakage, aging and installation-related problems.

This application collects the braking data of the vehicle to be controlled through the integrated braking control system. The brake booster system judges the driver's braking intention based on the braking data, and generates braking according to the driver's braking intention and the vehicle braking request. The boost pressure solves the technical problem of low stability of the brake booster that exists in the prior art when assisting braking by detecting the change of the brake fluid pressure of the master cylinder or using the method of reversing the motor to recover the braking capacity, and realizes The technical effect of improving the stability of the brake booster is obtained.

On the basis of the above technical solutions, Fig. 3 is a flow chart of another brake boosting method provided by the embodiment of the present invention. As shown in Fig. 3, in S105, the brake boosting system determines the brake boosting of the vehicle to be controlled Before pressure, the brake boost method also includes:

S301, the brake booster system acquires the current working state of the integrated brake control system.

Specifically, since the integrated brake control system is a highly integrated wire-control decoupling system, in order to better complete the braking at a safe distance through the compensated brake booster and ensure the safety of the driver and passengers, the brake booster When the system generates brake booster pressure, it is also necessary to determine whether the integrated brake control system is faulty, that is, whether there is a failure condition, to determine whether the required brake booster can be generated in the future, so it is also necessary to obtain the integrated brake control system The current working state of the system.

S302. The brake assist system judges the fault level of the integrated braking control system based on the current working state of the integrated braking control system.

S303, the brake booster system determines a corresponding brake booster pressure generation mode based on the fault level of the integrated brake control system.

Specifically, since there are many sensors or other parts involved in the integrated brake control system, the failure situations are also different. In some cases, some sensors or parts fail, and the remaining parts can still complete the brake boosting. Therefore, the current working status of the integrated brake control system is divided into different failure levels according to different failure degrees, so that the brake booster system can provide corresponding brake booster modes according to the failure levels of the integrated brake control system (that is, the above-mentioned Brake boost pressure generation mode) and alarm strategy.

On the basis of the above-mentioned technical solutions, S302 specifically includes: if the integrated brake control system is not faulty, the fault level of the integrated brake control system is level one; if the pedal stroke sensor of the integrated brake control system is faulty, Then the failure level of the integrated brake control system is level two; if the master cylinder pressure sensor of the integrated brake control system fails or the oil tank liquid level sensor fails, the failure level of the integrated brake control system is level three; if If all faults of the integrated braking control system fail, the fault level of the integrated braking control system is level four.

On the basis of the above-mentioned technical solutions, the brake booster pressure generation modes include full-function mode, pedal feel degradation mode, alternate pressure build-up mode, single-pipeline pressure build-up mode, and mechanical backup mode. S303 specifically includes: integrated brake control When the failure level of the system is level 1, the brake booster pressure generation mode of the brake booster system adopts the full-function mode; when the failure level of the integrated brake control system is level 2, the brake booster pressure generation mode of the brake booster system Pedal feeling degradation mode is adopted; when the failure level of the integrated brake control system is level three, the brake booster pressure generation mode of the brake booster system adopts the alternate pressure build-up mode or single-pipeline pressure build-up mode; the integrated brake control system When the fault level is level four, the brake boost pressure generation mode of the brake boost system adopts the mechanical backup mode.

Specifically, the full-function mode (FullSys), that is, the braking request of the brake booster system comes from the action of the driver stepping on the brake pedal. When the driver steps down the brake pedal, the brake booster system calculates the brake pressure, and at the same time according The driver needs to provide brake booster; the degraded pedal feel mode (Degraded Pedal Feel) is the mode adopted when the pedal travel sensor of the integrated brake control system fails, and the brake booster system will issue a warning prompt to the driver at this time ; Alternate pressure building mode (Circuit Separation) refers to the mode used when the two pressure building channels in the brake booster system are not completely ineffective and can generate power alternately. The single circuit pressure building mode (C1/2BoostOnly) It refers to the mode used when only one of the two pressure building channels in the brake booster system can generate brake booster and the other has failed. In short, the alternate pressure building mode and the single line pressure building mode are both based on circuit isolation The idea is to disconnect the faulty circuit and use the normal working circuit for subsequent control; the mechanical backup mode (HydBack) is the mode adopted by the brake booster system when the integrated brake control system fails. , the brake assist system will not produce assist, that is, this mode is no assist mode.

Fig. 4 is a hydraulic schematic diagram of the full function mode provided by the embodiment of the present invention.

Exemplarily, as shown in Fig. 4, in the full-function mode, when the brake pedal is stepped on, the master cylinder simulation valve CSV1 (Cylinder Simulation Valve), CSV2 is closed, which is used to isolate the oil tank in the vehicle to be controlled. The connected master cylinder and pressure building cylinder; the sense simulation valve SSV (Sense Simulation Valve) is opened; the pressure building simulation valves PSV1 and PSV2 are opened, and four IV valves (Isolation Valve, isolation valve) are opened (that is, the IVLF shown in Figure 4 , IVRR, IVLR, IVRF four valves, in which LF means left front, RR means right rear, LR means left rear, RF means right front), which are used to open the active pressure building circuit; The signal value is detected by the pressure sensor and the pedal stroke sensor; the pedal feeling simulator PFS (PadelFeeling Simulator) generates the pedal feeling signal, the motor works, and the pressure building cylinder builds pressure to realize the pressure building of 4 wheel cylinders.

It should be noted that in Figure 4, the four circles marked with LF, RR, LR, and RF respectively represent the left front wheel, right rear wheel, left rear wheel, and right front wheel of the vehicle to be controlled; P/U represents the pressure Sensor, T/U means temperature sensor, φ/U means angle sensor.

On the basis of the above technical solutions, before S105, the brake boosting system determines the brake boosting pressure of the vehicle to be controlled, the brake boosting method also includes:

Prioritize the read current braking requests using the preset priority order, wherein the preset priority order includes: the pedal brake request is the first priority, the active emergency braking system request, the brake anti-lock The braking system request and the vehicle dynamic braking request are the second priority, the external braking request is the third priority, and the electronic parking system request is the fourth priority.

Specifically, since the pedal braking request is the first braking request issued by the driver by stepping on the brake pedal, the pedal braking request is the braking request with the highest priority among all current braking requests. After that, according to The priority of the braking request, the active emergency braking system request, the braking anti-lock braking system request and the vehicle dynamic braking request are set as the second priority, the external braking request is set as the third priority, and the electronic parking System requests are set to the fourth priority.

On the basis of the above technical solutions, S104 specifically includes: the brake boosting system determines the vehicle braking request of the vehicle to be controlled based on the priority ranking of the current braking request and the current actual working condition of the vehicle to be controlled.

Specifically, after obtaining the priority ranking of the current braking requests, the brake booster system will determine the vehicle braking request of the vehicle to be controlled according to the priority ranking of the current braking requests and the current actual working condition of the vehicle to be controlled.

On the basis of the above technical solutions, after the brake boosting pressure of the vehicle to be controlled is determined in S105, the brake boosting method further includes: the brake boosting system adjusts the brake fluid of the integrated brake control system based on the brake boosting pressure In and out volume; the integrated brake control system uses the adjusted brake fluid in and out volume to control the vehicle to be controlled to brake.

Specifically, referring to FIG. 2 , after obtaining the brake boost pressure of the vehicle to be controlled, the brake boost system adjusts the amount of brake fluid in and out of the integrated brake control system based on the brake boost pressure, so that the integrated brake control system can Perform brake boosting control on the vehicle to be controlled.

In the embodiment of the present invention, by using the brake boosting method provided by the application, it has the following advantages: (1) The integrated brake control system and the brake boosting system monitor the displacement of the push rod input by the driver and the master cylinder According to the different failure conditions of the integrated brake control system, the brake booster system can provide corresponding The booster mode and alarm strategy, through the compensated brake booster, complete the braking at a safe distance to ensure the safety of the driver and passengers. (3) The braking process is stable and comfortable, especially in the low-speed parking process without obvious vehicle pitching, which solves the problem that the braking booster in the prior art is only applicable to the high-speed braking state. (4) Under different driving modes (sports, comfort, snow, etc.), realize the adaptive adjustment function of the brake pedal feeling of less than 0.4g (calibrated value), that is, to realize the recognition and calibration of different parameters by the driver's braking intention. (5) When the vehicle speed exceeds 100km/h, the deceleration is below 0.3g, and the time exceeds 2s, the integrated brake control system can perform brake hydraulic compensation to ensure constant deceleration, and enter and exit with a certain slope (entry and exit Slope to be calibrated)

Fig. 5 is a structural diagram of a brake booster device provided by an embodiment of the present invention. As shown in Fig. 5, the brake booster device includes:

The integrated braking control system 51 is used to obtain braking data of the vehicle to be controlled when the driver of the vehicle to be controlled depresses the brake pedal, wherein the braking data includes push rod displacement, master cylinder pressure and brake pedal Signal;

a brake booster system 52, configured to determine the driver's target braking demand based on the braking data;

The integrated braking control system 51 is also used to read the current braking request of the vehicle to be controlled, wherein the current braking request includes at least one of the following: pedal braking request, active emergency braking system request, brake anti-lock braking System request, vehicle dynamic braking request, external braking request and electronic parking system request;

The brake booster system 52 is also used to determine the vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual working condition of the vehicle to be controlled;

The brake booster system 52 is also used to determine the brake booster pressure of the vehicle to be controlled based on the target brake demand and the vehicle brake request.

Optionally, before the brake booster system 52 determines the brake booster pressure of the vehicle to be controlled, the brake booster system 52 is also used to acquire the current working state of the integrated brake control system; The working state judges the failure level of the integrated brake control system; and determines the corresponding brake boosting pressure generation mode based on the failure level of the integrated brake control system.

Optionally, the brake booster system 52 is specifically used for:

If the integrated braking control system 51 has no fault, it is judged that the fault level of the integrated braking control system 51 is level one;

If the pedal stroke sensor of the integrated brake control system 51 fails, it is judged that the failure level of the integrated brake control system 51 is level two;

If the master cylinder pressure sensor of the integrated braking control system 51 fails or the oil tank liquid level sensor fails, it is judged that the failure level of the integrated braking control system 51 is level three;

If all faults of the integrated braking control system 51 fail, it is judged that the fault level of the integrated braking control system 51 is level four.

Optionally, the brake booster pressure generation modes include full-function mode, pedal feel degradation mode, alternate pressure build-up mode, single-line pressure build-up mode and mechanical backup mode, and the brake booster system 52 is specifically used for:

When the failure level of the integrated brake control system 51 is level one, the brake booster pressure generation mode of the brake booster system 52 adopts the full-function mode;

When the failure level of the integrated brake control system 51 is Level 2, the brake booster pressure generation mode of the brake booster system 52 adopts the pedal feel degraded mode;

When the failure level of the integrated brake control system 51 is level three, the brake booster pressure generation mode of the brake booster system 52 adopts the alternate pressure build-up mode or the single-pipeline pressure build-up mode;

When the fault level of the integrated brake control system 51 is level four, the brake booster pressure generation mode of the brake booster system 52 adopts the mechanical backup mode.

Optionally, the brake booster system 52 is also used to: use the brake pedal signal to simulate to obtain a pedal feel signal; use the pedal feel signal, push rod displacement and master cylinder pressure to determine and obtain the driver's target braking demand through simulation.

Optionally, before the brake boosting system 52 determines the vehicle braking request of the vehicle to be controlled, the brake boosting system 52 is also used to:

Prioritize the read current braking requests using the preset priority order, wherein the preset priority order includes: the pedal brake request is the first priority, the active emergency braking system request, the brake anti-lock The braking system request and the vehicle dynamic braking request are the second priority, the external braking request is the third priority, and the electronic parking system request is the fourth priority.

Optionally, the brake booster system 52 is further configured to: determine the vehicle braking request of the vehicle to be controlled based on the prioritization of the current braking requests and the current actual working condition of the vehicle to be controlled.

Optionally, after the brake booster system 52 determines that the brake booster pressure of the vehicle to be controlled is obtained, the brake booster system 52 is also used to adjust the amount of brake fluid in and out of the integrated brake control system 51 based on the brake booster pressure; The integrated brake control system 51 is also used to control the vehicle to be controlled to perform braking by using the adjusted brake fluid in and out volume.

The implementation principles and technical effects of the device provided by the embodiment of the present invention are the same as those of the foregoing method embodiment. For brief description, for the parts not mentioned in the device embodiment, reference may be made to the corresponding content in the foregoing method embodiment.

The brake boosting device provided by the embodiment of the present invention has the same technical features as the brake boosting method provided by the above embodiment, so it can also solve the same technical problem and achieve the same technical effect.

An embodiment of the present invention also provides a vehicle, which includes the brake booster device in any embodiment.

The vehicle provided by the embodiment of the present invention includes the brake booster device in the above embodiment, so the vehicle provided by the embodiment of the present invention also has the beneficial effects described in the above implementation, which will not be repeated here.

In the description of the embodiments of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Finally, it should be noted that the above are only preferred embodiments and applied technical principles of the present invention. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. A brake assist method characterized by, when a driver of a vehicle to be controlled depresses a brake pedal, comprising:

the integrated brake control system acquires brake data of a vehicle to be controlled, wherein the brake data comprises push rod displacement, master cylinder pressure and brake pedal signals;

a brake boosting system determines a target braking demand of the driver based on the braking data;

the integrated brake control system reads a current brake request of the vehicle to be controlled, wherein the current brake request at least comprises one of the following: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;

the brake boosting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;

the brake boosting system determines a brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.

2. The brake boosting method of claim 1, wherein prior to the brake boosting system determining the brake boosting pressure of the vehicle to be controlled, the brake boosting method further comprises:

the brake power assisting system acquires the current working state of the integrated brake control system;

the brake boosting system judges the fault level of the integrated brake control system based on the current working state of the integrated brake control system;

the brake boost system determines a corresponding brake boost pressure generation mode based on a fault level of the integrated brake control system.

3. The brake boosting method of claim 2, wherein the brake boosting system determining the fault level of the integrated brake control system based on the current operating state of the integrated brake control system comprises:

if the integrated brake control system has no fault, the fault grade of the integrated brake control system is one grade;

if the pedal travel sensor of the integrated brake control system fails, the failure grade of the integrated brake control system is two grades;

if a master cylinder pressure sensor of the integrated brake control system fails or an oil can liquid level sensor of the integrated brake control system fails, the failure level of the integrated brake control system is three levels;

and if all the faults of the integrated brake control system fail, the fault grade of the integrated brake control system is four.

4. A brake boosting method according to claim 3, wherein the brake boosting pressure generation modes include a full function mode, a pedal feel degraded mode, an alternate build-up mode, a single line build-up mode, and a mechanical backup mode, and the brake boosting system determining the respective brake boosting pressure generation mode based on the fault level of the integrated brake control system comprises:

when the fault grade of the integrated brake control system is one grade, the brake boosting pressure generation mode of the brake boosting system adopts a full-function mode;

when the fault grade of the integrated brake control system is two-grade, a brake boosting pressure generation mode of the brake boosting system adopts a pedal feel degradation mode;

when the fault grade of the integrated brake control system is three-grade, the brake boosting pressure generation mode of the brake boosting system adopts an alternate voltage build-up mode or a single pipeline voltage build-up mode;

when the fault grade of the integrated brake control system is four, the brake boosting pressure generation mode of the brake boosting system adopts a mechanical backup mode.

5. The brake boosting method of claim 1, wherein the brake boosting system determining the driver's target braking demand based on the braking data comprises:

the brake boosting system utilizes the brake pedal signal to simulate to obtain a pedal feeling signal;

and the brake boosting system determines to obtain the target brake demand of the driver through simulation by utilizing the pedal feeling signal, the push rod displacement and the master cylinder pressure.

6. A brake boosting method according to claim 1, wherein prior to determining a vehicle braking request of the vehicle to be controlled, the brake boosting method further comprises:

and performing priority sequencing on the read current braking request by using a preset priority sequence, wherein the preset priority sequence comprises the following steps: the pedal braking request is of a first priority, the active emergency braking system request, the anti-lock braking system request and the vehicle dynamic braking request are of a second priority, the external braking request is of a third priority, and the electronic parking system request is of a fourth priority.

7. The brake boosting method of claim 6, wherein the brake boosting system determining the vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual operating condition of the vehicle to be controlled comprises:

and the brake boosting system determines the vehicle brake request of the vehicle to be controlled based on the priority ranking of the current brake request and the current actual working condition of the vehicle to be controlled.

8. The brake boosting method according to claim 1, wherein after determining that the brake boosting pressure of the vehicle to be controlled is obtained, the brake boosting method further comprises:

the brake boosting system adjusts the brake fluid input and output quantity of the integrated brake control system based on the brake boosting pressure;

and the integrated brake control system controls the vehicle to be controlled to brake by using the regulated brake fluid inlet and outlet quantity.

9. A brake boosting device characterized by comprising:

the integrated brake control system is used for acquiring brake data of a vehicle to be controlled when a driver of the vehicle to be controlled steps on a brake pedal, wherein the brake data comprises push rod displacement, master cylinder pressure and a brake pedal signal;

a brake boosting system for determining a target braking demand of the driver based on the braking data;

the integrated brake control system is further used for reading a current braking request of the vehicle to be controlled, wherein the current braking request at least comprises one of the following: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;

the brake boosting system is further used for determining a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;

the brake boosting system is further used for determining the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.

10. A vehicle, characterized in that it comprises a brake boosting device according to claim 9.

Images