CN103359100B - A kind of Automobile brake control system and control method - Google Patents

Abstract

The present invention proposes an automobile brake control system, which includes a booster module in the automobile electronic stability control system; a first detection module for detecting and outputting the vacuum degree in the vacuum booster to the control module; a control module for After receiving the vehicle braking signal, it is judged whether the vacuum degree in the vacuum booster is less than the vacuum degree preset threshold value, if yes, then send a supercharging command, if not, then the braking control is terminated; the booster The pressure module is used to control the brake to perform braking according to the boost instruction issued by the control module; the invention uses the boost module in the electronic stability control system of the automobile to realize the vehicle braking performance compensation under specific operating conditions and improve The utilization rate of the electronic stability control system of the automobile; in addition, the present invention also provides a control method for the braking control system.

Description

Automobile brake control system and control method

technical field

     The invention relates to the field of braking of automobiles, in particular to an automobile braking control system and a control method.

Background technique

    As an important technology in the field of automobile technology, automobile brake control is related to the safety performance of automobiles. The vacuum booster brake system uses the vacuum of the engine manifold to achieve vacuum boost, but it is often caused by insufficient vacuum under certain working conditions. Automobile braking control performance declines; the methods used to improve automobile braking performance in the prior art include: jet valves, electric auxiliary vacuum pumps, electrohydraulic master cylinders, electric vacuum pumps or mechanical vacuum pumps. There are requirements for the minimum vacuum of the engine, which cannot completely solve the braking performance degradation caused by insufficient braking vacuum under specific working conditions; the electric vacuum pump can effectively improve the braking performance caused by insufficient vacuum, but the life of the electric vacuum pump is low, and system components Many, which increase the vehicle's power load and noise source; the electro-hydraulic master cylinder has a complex structure, high cost, large power load and loud noise. At present, there are certain restrictions on popularization and use, and it is mainly used in pure electric, hybrid or high-end SUV and other vehicles. , the mechanical vacuum pump can effectively solve the braking performance degradation caused by insufficient vacuum, but because the mechanical vacuum pump is directly driven by the engine, it has high requirements on the layout of the engine and the vibration balance of the engine, the above-mentioned automotive brake control system is an additional It is used to make up for the defect that the vacuum of the vacuum booster causes the car's braking performance to decrease. The additional brake control system not only increases the cost, but also makes the car more complicated.

Contents of the invention

In order to solve the problems of complex compensation and high cost of the vacuum degree compensation system of the vacuum booster in the prior art, the present invention proposes a control system for automobile braking, which includes:

Booster modules in automotive electronic stability control systems;

The first detection module is used to detect and output the vacuum degree in the vacuum booster to the control module;

The control module is used to determine whether the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree after receiving the braking signal of the vehicle, if yes, send a boost command, and if not, brake control termination;

The boosting module is used to control the brake to perform braking according to the boosting instruction issued by the control module. the

In order to solve the problems existing in the prior art, the present invention also proposes a control method for the above-mentioned automobile brake control system, which includes the following steps:

Receive braking signal;

Detect the vacuum degree in the vacuum booster;

Judging whether the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, if not, the brake control is terminated, and if it is, a boost command is sent;

The brake is controlled to perform braking according to the boost command.

The automobile brake control system of the present invention utilizes the original booster module in the automobile electronic stability control system to realize the compensation of the vacuum degree of the vacuum booster, which improves the utilization rate of the automobile electronic stability control system, and does not add an additional control system to Compensate for the lack of vacuum in the vacuum booster, reducing the complexity and cost of the car.

Description of drawings

Fig. 1 is a block diagram of an embodiment of the automobile braking control system of the present invention.

Fig. 2 is a block diagram of Embodiment 2 of the automobile braking control system of the present invention.

Fig. 3 is a flow chart of the third embodiment of the control method of the vehicle electronic stability control system for controlling the brakes of the vehicle according to the present invention.

Fig. 4 is the flow chart of the improvement of the third embodiment of the control method for controlling the braking of the vehicle by the electronic stability control system of the vehicle according to the present invention.

FIG. 5 is a flow chart of another improvement of the third embodiment of the control method for controlling the braking of the vehicle by using the vehicle electronic stability control system in the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The term "module" as used herein refers to application-specific integrated circuits, electronic circuits, processors and memories that execute one or more software or hardware programs, combinational logic circuits, and/or other suitable devices that provide the described functionality .

The automotive electronic stability program control system is mainly used to stabilize the vehicle body when the vehicle deflects or rolls. Other specific details will not be introduced here, and those skilled in the art can understand it in combination with the prior art.

The automotive electronic stability control system includes a program-controlled autonomous supercharging module. The electronic stability control system shown in the present invention covers but is not limited to the existing ABS (ABS+EBD), ASR (ABS+EBD+ASR), electronic stability control system (EBD+ABS+ASR+ESC), VDC (EBD+ABS+ASR+ESC+VDC), electro-hydraulic booster system, but the autonomous booster module in the automotive electronic stability control system has a relatively low probability of use during normal braking, so the present invention expands the electronic stability control system Functional application, the self-supercharging module in the electronic stability control system is applied to the vacuum compensation of the automotive vacuum booster to make its utilization more efficient.

The control module in the automobile brake control system of the present invention can be arranged separately, also can be arranged on the ECU of automobile electronic stability control system, and described ECU is the processor of automobile electronic stability control system, and said processor here is hardware, The control module in this article is set on the ECU of the automotive electronic stability control system, which can save hardware costs. The control module is equipped with a preset threshold value of vacuum degree, preset requirements of engine operating parameters, vacuum of engine manifold and vacuum booster. The preset threshold value of degree difference, etc., the control module can compare each detected value with the preset threshold value stored internally, and then send the corresponding boost command and/or the first alarm command to the original electronic stability control system In some supercharging modules, the supercharging module uses supercharging to control the brake to make up for the defect that the vacuum in the vacuum booster causes the vehicle’s braking performance to decline. The specific control scheme is as follows:

As shown in Fig. 1, it is Embodiment 1 of the present invention, the control system of the automobile brake that the present invention proposes comprises: the supercharging module 2 in the automobile electronic stability control system; The first detection module 3, is used for detecting and outputting to the control module The degree of vacuum in the vacuum booster 6, wherein the first detection module can be a vacuum degree sensor, an air pressure sensor, and other devices that can detect the degree of vacuum; the control module 1 obtains a braking signal from the brake pedal through a signal line, for After receiving the automobile braking signal, it is judged whether the vacuum degree in the vacuum booster 6 is less than the vacuum degree preset threshold value, if yes, then send a supercharging command, if no, then the braking control is terminated; The supercharging module 2 is used for supercharging according to the supercharging command issued by the control module to control the brake to perform braking.

Embodiment 1 of the present invention uses the booster module in the automotive electronic stability control system to complete the compensation of the booster vacuum degree, which improves the utilization efficiency of the booster module, and at the same time, compared with the booster vacuum compensation system set separately, reduces the The complexity of brake control.

In order to be able to accurately determine the cause of the insufficient vacuum of the vacuum booster, the present invention proposes a second embodiment.

As shown in Figure 2, it is a block diagram of Embodiment 2 of the present invention. One of the differences between Embodiment 2 and Embodiment 1 is that a second detection module 4 and an alarm unit are added in Embodiment 2, and the second detection module is used to detect and report The control module 1 outputs the operating parameters of the engine 7, and the second detection module 4 is an original module on the car, which is connected with the control module 1 through a signal line to realize signal transmission, for example, the control module obtains the engine operation from the CAN system through the CAN bus. parameters, at this time the second detection module 4 comes from the CAN system, of course the second detection module 4 can also be a separate detection module; the control module 1 judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree Afterwards, instead of sending a supercharging command, it is further judged whether the engine operating parameters meet the preset requirements. If the engine operating parameters do not meet the preset requirements, the supercharging command is sent. If the engine operating parameters meet the preset requirements, the supercharging command is sent. and the first alarm command; the supercharging module 2 is used to control the brake 5 to perform braking according to the supercharging command, and the alarm unit alarms according to the first alarm command. The alarm unit of this embodiment is the original Of course, the alarm can also be newly set. The preset requirements of the engine operating parameters in this embodiment depend on the vehicle model, engine model and other factors depending on the specific situation, and there is no limitation here.

In the foregoing embodiment, the vacuum booster 6 is divided into two chambers. When the vacuum booster is working normally, one of the chambers communicates with the external environment and can be called an atmospheric chamber. The other chamber is a vacuum chamber, and the vacuum in the vacuum chamber is passed through The engine manifold extracts air to form, the first detection module 3 is installed in the vacuum chamber, monitors the vacuum degree of the vacuum chamber and transmits the vacuum degree to the control module 1 in the electronic stability control system, and the control module 1 is provided with a vacuum degree preset Threshold value, the preset threshold value is set according to factors such as vehicle type and car configuration. For example, the preset threshold value of the vacuum degree in this embodiment is 30kPa, so when the vacuum degree in the vacuum booster is less than this value, the control The module will send a supercharging instruction; the second detection module 4 is used to detect the operating parameters of the engine, such as water temperature, rotating speed, etc. Set the threshold value and the preset threshold value of the speed. When the control module judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree, it will not send a boost command, but will further judge what factors cause the vacuum booster to fail. If the vacuum degree is insufficient, the engine operating parameters will be checked one by one, and corresponding actions will be taken according to the specific situation. A specific judgment of the engine operating parameters is as follows: the control module 1 judges whether the engine water temperature is lower than the preset threshold value of the engine water temperature, if it is If yes, then send a boost command, if not, then judge whether the engine speed is less than the engine speed preset threshold value, if the engine speed is less than the engine speed preset threshold value, then send a boost command, if the engine speed is greater than or equal to If the preset threshold value of the engine speed is set, the boost command and the first alarm command will be sent. The purpose of sending the alarm command is to remind the staff that the lack of vacuum is not caused by the engine operating parameters, but other reasons, such as air leakage in the pipeline, etc., which is convenient for the staff to check. Repair; here, the preset water temperature threshold is 85°C, and the engine speed preset threshold is 1000rpm. Of course, the preset threshold values of booster vacuum, engine water temperature, and speed are not unique, depending on the specific situation. In the present invention, the judging order of the engine water temperature and the rotational speed has no priority.

In the above embodiment, after receiving the boost command, the boost module will make appropriate boost according to the boost command and transmit the pressure to the brake through the pipeline, and the brake will perform braking. The boost in this embodiment is hydraulic boost. The hydraulic control unit of the electronic stability control system realizes pressurization through the hydraulic pump, and is connected with the brake hydraulic pipeline through the hydraulic output channel of the hydraulic unit in the electronic stability control system, so as to realize braking.

With regard to the improvement of the first embodiment, the second embodiment also includes the judgment on the opening and closing of the air conditioner. The control module obtains the opening and closing signal of the air conditioner through the signal line, and the judgment on the opening and closing of the air conditioner also includes an execution module for shutting down the air conditioner (not shown in the figure). output), when the control module 1 judges that the vacuum degree in the vacuum booster is lower than the vacuum degree preset threshold value, it does not send a boost command, but judges whether the air conditioner is turned on, because the air conditioner turns on and the engine load increases, which will cause The vacuum degree of the engine is relatively low under certain working conditions. If the control module judges that the air conditioner is off, the judgment on the air conditioner is terminated. If it is judged that the air conditioner is on, it sends a shutdown command, and the shutdown execution module receives the shutdown Command to turn off the air conditioner. The air conditioner in this embodiment is turned off temporarily. After the braking is completed, the air conditioner will work normally;

After the air conditioner is turned off, the control module continues to judge whether the vacuum degree of the vacuum booster is lower than the preset threshold value, if not, the braking control of the control module is terminated.

Compared with Embodiment 1, this embodiment 2 also adds a third detection module 8 and an alarm unit, which are used to detect the air pressure of the environment and output the ambient air pressure to the control module 1. The third detection module 8 of this embodiment is an air pressure sensor. Of course, it can be Any sensor that can detect ambient air pressure is not limited by the present invention. The addition of ambient air pressure judgment here is mainly when the car is in a high altitude place such as a plateau. Due to the thin air, the pressure difference between the atmospheric chamber and the vacuum chamber in the vacuum booster may be caused. After the control module determines that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree, and before sending the boost command, the control module 1 determines whether the ambient air pressure is less than the preset threshold value value, if yes, send a boost instruction, if not, send a boost instruction and the first alarm instruction, the boost module 2 pressurizes according to the boost instruction to control the brake to perform braking, and the alarm unit is used to The alarm command alarms, and the alarm unit can specifically be a wind buzzer, a light or a combination of wind buzzers and lights.

In the second embodiment, the judgment of ambient air pressure, engine operating parameters and air conditioner opening and closing can be carried out simultaneously, or can be distributed. And/or send a first warning command, or send a supercharging command to control the brake to perform supercharging and/or send a first warning command after one of the engine operating parameters and ambient air pressure is judged.

This embodiment two relative embodiment one has also increased the fifth measurement module 9 and alarm unit, is used for detecting the vacuum degree of automobile engine manifold and is output to control module 1, and the fifth detection module 9 can be pressure sensor, vacuum degree sensor , the control module 1 judges the difference between the vacuum degree of the vacuum booster output by the first detection module and the vacuum degree of the engine manifold, if the difference between the two is greater than the preset threshold value, a second alarm command is issued and the fault code is stored , this situation may be caused by air leakage in the conduit connecting the vacuum chamber and the engine, etc. At this time, the alarm unit performs an alarm to remind the operator to overhaul; if the difference between the two is less than or equal to the preset threshold value, then The judgment is terminated. In this embodiment, it is a response to this judgment. The control module will also judge and make a corresponding response when receiving the vacuum booster vacuum degree and the engine manifold vacuum degree in the next cycle.

As a further improvement to Embodiment 1, the control module 1 described in Embodiment 2 also compares the current value of the vacuum degree in the vacuum booster detected by the first detection module with the vacuum degree detected last time, and if the difference exceeds the preset threshold value, the third alarm command is sent and the fault code is stored, and the alarm unit alarms. If the difference is less than or equal to the preset threshold value, this judgment is terminated, and the judgment is continued until the next cycle arrives, and so on; the above two This test is mainly to determine whether the vacuum booster and/or engine manifold is leaking, and can alert the operator at the same time.

Compared with the first embodiment, the second embodiment also adds a fourth module 11 , which is used to detect the wheel speed of the vehicle and output it to the control module 1 . After the brake performs braking, if the control module 1 judges that the vehicle speed is not zero during the duration of the boost command, the boost module will maintain continuous boost until the boost command is released or the vehicle speed is zero. If the vehicle speed is zero, control The module stops sending pressurization instructions, and the brake control is terminated. This function is designed to prevent the hydraulic control module in the electronic stability control system of the vehicle from working ineffectively for a long time; the vehicle speed detection module 11 is a wheel speed sensor in the electronic stability control system, and the electronic stability control system The wheel speed sensor of the control system is generally installed on the hub unit 12 .

As a further improvement to Embodiment 1 and Embodiment 2, the preset vacuum degree threshold value includes the first vacuum degree preset threshold value, the second vacuum degree preset threshold value, and the third vacuum degree that increase sequentially Preset threshold value; when the control module judges that the vacuum degree in the vacuum booster is less than the first vacuum degree preset threshold value according to the information output by the first detection module, the control module sends the first pressurization instruction, and when the control module When the module judges that the vacuum degree in the vacuum booster is greater than or equal to the first vacuum degree preset threshold value and less than the second vacuum degree preset threshold value according to the information output by the first detection module, the control module sends a second increment pressure command, when the control module judges according to the information output by the first detection module that the vacuum degree in the vacuum booster is greater than or equal to the second vacuum degree preset threshold value and less than the third vacuum degree preset threshold value, The control module sends a third boost command, and the boost controlled by the first boost command, the second boost command and the third boost command increase in a gradient in turn, and the "gradient increase" here refers to a certain The law increases, such as the arithmetic sequence law; when the control module judges that the vacuum degree of the vacuum booster in the vacuum booster is greater than or equal to the third vacuum degree preset threshold value according to the information output by the first detection module, the control module The brake control is terminated; the present invention sets three preset vacuum thresholds, and the control module sends out different supercharging commands according to different preset thresholds, and the supercharging module makes different responses according to the supercharging commands to better match the vehicle Braking, of course, the number of preset thresholds of the vacuum degree is not particularly limited, and needs to be determined according to actual needs.

Regarding the above-mentioned embodiment 1 and embodiment 2, the present invention also proposes embodiment 3. Embodiment 3 is a method for controlling the braking of an automobile by means of the electronic stability control system of the automobile. As shown in FIG. 3 , the braking of the automobile is The control method comprises the following steps:

Step 101 is to receive the brake signal,

In step 101, the brake signal comes from the brake pedal of the car, and usually receives the brake signal represented by the level. When the received level is high, it means that the brake is started, and the brake signal is transmitted through the CAN bus of the car. Of course, the braking signal can also be represented by a low level;

Step 102 is to detect the degree of vacuum in the vacuum booster,

In step 102, the vacuum degree is detected by a sensor, usually a vacuum degree sensor;

Step 103 is to judge whether the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, if no, the brake control is terminated, if yes, execute step 1041 to send a boosting command,

In step 103, the control module in the automotive electronic stability control system completes the judgment of the vacuum degree and makes a response;

Step 105 controls the brake to perform boosting according to the boosting instruction,

The device that performs boosting is the boosting module in the automotive electronic stability control system, usually hydraulic boosting.

As shown in Figure 4, as an improvement to Embodiment 3, Embodiment 4 is proposed. In Embodiment 4, step 103 is executed to determine that the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, and the boost command is not sent, but Yes, execute step 104 to continue judging whether the engine operating parameters meet the preset requirements, if the engine operating parameters do not meet the preset requirements, execute step 1041 to send a boost command, and if the engine operating parameters meet the preset requirements, execute step 1042 to send a boost command and the first alarm command, step 105 is to receive the supercharging command to pressurize the brake to perform braking after judging that the engine operating parameters meet the preset requirements, and step 106 is to receive the supercharging command after judging that the engine operating parameters do not meet the preset requirements The pressurization control brake performs braking and gives an alarm; the preset threshold value of the vacuum degree here is based on practice, and the preset threshold value may be different for different models of vehicles.

In step 102, the detection of the vacuum degree in the vacuum booster and the engine operating parameters has always existed, and the judgment of the vacuum degree in the vacuum booster is based on receiving the braking signal, and the engine operating parameters can be provided through the CAN system of the vehicle ;

As an improvement of the third embodiment, as shown in Figure 5, after performing step 103 to judge that the vacuum degree in the vacuum booster is less than the vacuum degree preset threshold value, and before sending the boost command, the engine operating parameters and the air conditioner are simultaneously checked. Judgment, of course, can also be judged separately. The judgment of engine operating parameters has been described in detail above, and it is no longer cumbersome here. Step 107 is to judge whether the air conditioner is turned on.

Then perform step 108 to turn off the air conditioner, and judge the vacuum degree in the vacuum booster. If the vacuum degree in the vacuum booster is less than the vacuum degree preset threshold value, perform step 1071 to terminate the judgment of the air conditioner. If the vacuum degree is greater than or equal to the preset door limit value, then perform step 109 to terminate the braking control; the reason for judging the air conditioner on and off is: the air conditioner is turned on, and the engine load increases, causing the vacuum degree of the engine to be relatively low under specific working conditions, so when the vacuum degree in the vacuum booster is less than After the threshold is preset, it is necessary to determine whether the air conditioner is on or off.

The specific steps for judging the engine operating parameters are as follows:

Determine whether the engine water temperature is lower than the preset threshold value of the engine water temperature, if yes, send a boost command, if not;

Judging whether the engine speed is less than the preset threshold value of the engine speed, if yes, sending a supercharging command, if not, sending a supercharging command and a first alarm command;

receiving a pressurization command and pressurizing to control the brake to perform braking and receiving a first warning command to perform an alarm.

The judgment of engine water temperature and speed has no order relationship. In addition, the reason for judging engine operating parameters is that low engine water temperature and speed will cause low vacuum in the engine manifold, which will lead to a decrease in vacuum in the vacuum booster vacuum chamber.

As a further improvement, after it is judged that the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, and before sending the boost command, the following steps are also included:

Detect ambient air pressure and output,

Determine whether the ambient air pressure is less than the preset threshold value, if yes, send a boost command, if not, send a boost command and the first alarm command, the low ambient air pressure will cause the atmosphere in the vacuum booster and the vacuum The reduction of the chamber pressure difference leads to a decrease in braking performance. The ambient air pressure is mainly caused by weather changes or altitude changes. The ambient air pressure is always detected. The present invention only judges the ambient air pressure when braking.

In the third embodiment, the judgment of ambient air pressure and engine operating parameters can also be judged successively or simultaneously. One way of successive judgment is to judge the engine operating parameters after judging the ambient air pressure. If one of them does not meet the preset If required, send a supercharging command. If all meet the preset requirements, then send a supercharging command and the first alarm command. Another way to judge successively is to judge the engine operating parameters before judging the ambient air pressure, and judge it as the control module at the same time. While judging the ambient air pressure, judge the engine operating parameters at the same time. When the engine parameters and ambient air pressure meet the preset requirements, it means that the lack of vacuum is caused by other reasons, and the staff needs to check.

After the brake performs braking, in order to protect the hydraulic booster module of the electronic stability control system and prevent the hydraulic booster module from pressurizing the brake after the vehicle speed is zero, which will cause the temperature to rise and burn out the device, the following steps are also performed: Check whether the vehicle speed is If it is not, the control module will continue to send the boost command, and the hydraulic module will maintain the boost until the boost command is released. If the vehicle speed is zero during the boost command duration, the boost will be terminated.

In order to achieve different pressurization for different vacuum degrees in the vacuum booster, the vacuum degree preset threshold values in the third embodiment of the present invention are three, which are respectively the first vacuum degree preset threshold value, The second vacuum degree preset threshold value and the third vacuum degree preset threshold value; judge the vacuum degree of the vacuum booster, and when the vacuum degree of the vacuum booster is less than the first vacuum degree preset threshold value, send the first Boost command; when the vacuum degree of the vacuum booster is greater than or equal to the preset threshold value of the first vacuum degree and less than the preset threshold value of the second vacuum degree, the second boost command is sent; when the vacuum degree of the vacuum booster is greater than Or when it is equal to the second vacuum degree preset threshold value and is less than the third vacuum degree preset threshold value, send the third boost command; when the vacuum booster vacuum degree is greater than or equal to the third vacuum degree preset threshold value , the brake control is terminated; the boost pressure controlled by the first boost command, the second boost command and the third boost command increases in a gradient in turn, and of course the number of vacuum preset threshold values is not limited. According to specific needs.

In order to more accurately judge the cause of the insufficient vacuum of the vacuum booster, the present invention utilizes the automotive electronic stability control system to control the braking control method of the automobile and also detects the vacuum of the engine manifold, and judges the relationship between the vacuum in the vacuum booster and the vacuum booster. Whether the engine manifold vacuum difference is greater than the preset threshold value, if yes, send the second alarm command and store the fault code and alarm, the situation at this time may be the vacuum chamber and/or the engine to the vacuum booster If the difference between the vacuum degree in the vacuum booster and the vacuum degree of the engine manifold is less than or equal to the preset threshold value due to air leakage in the connecting pipeline, this time will be terminated and the judgment will continue after the next cycle arrives.

Further, the method also judges the difference between the vacuum degree of the vacuum booster detected this time and the vacuum degree of the vacuum booster detected last time, and if the difference is greater than the preset threshold value, a third alarm command is sent and Store the fault code and alarm. At this time, it may be caused by factors such as vacuum booster damage and air leakage. If the difference is less than or equal to the preset threshold value, this judgment will be terminated and continue after receiving the vacuum degree of the next cycle. judge.

In all embodiments of the present invention, the alarm prompts of the first alarm command, the second alarm command and the third alarm command are different, for example, through the length of the alarm sound, the volume of the alarm sound, etc., the staff can distinguish what is the reason according to the alarm command caused by the alarm.

In the embodiment of the present invention, the first detection module periodically detects the degree of vacuum in the vacuum booster.

In the embodiment of the present invention, not only the electronic stability control system of the vehicle is used to complete the vacuum degree compensation of the vacuum booster, but also various factors that may affect the vacuum degree of the vacuum booster are checked, such as engine operating parameters, ambient air pressure, and air conditioner opening and closing conditions, etc. , and make adaptive responses to different situations, for example, when the engine parameters do not meet the preset requirements, send a supercharging command, and when the engine operating parameters meet the preset requirements, send a supercharging command and the first alarm command; in addition, the present invention also aims at The vacuum degree of the engine manifold is compared with the vacuum degree of the booster, and it is checked whether the conduit connecting the engine and the vacuum booster is leaking; the present invention sets various safety inspection measures for automobile braking control, so that a detailed understanding of the causes of insufficient vacuum degree specific reason.

The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately. In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (18)

1. A vehicle braking control system, characterized in that the system comprises: Booster modules in automotive electronic stability control systems; The first detection module is used to detect and output the vacuum degree in the vacuum booster to the control module; The control module is used to determine whether the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree after receiving the braking signal of the vehicle, if yes, send a boost command, and if not, brake control termination; The boosting module is used to control the brake to perform braking according to the boosting instruction issued by the control module. 2. The automobile brake control system according to claim 1, further comprising: The second detection module is used to detect and output engine operating parameters to the control module; After the control module judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree, and before sending the boost command, it judges whether the engine operating parameters meet the preset requirements, if the engine operating parameters do not meet the preset requirements , send a boost command, if the engine operating parameters meet the preset requirements, send a boost command and a first alarm command; and The alarm unit is configured to alarm according to the first alarm instruction. 3. The automobile braking control system according to claim 1, further comprising: The third detection module is used to detect and output the ambient air pressure of the vehicle to the control module; After the control module judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree and before sending the boost command, it judges whether the ambient air pressure meets the preset threshold value, and if not, sends a boost pressure command. command, if yes, send a pressurization command and a first alarm command; and The alarm unit is configured to alarm according to the first alarm instruction. 4. The automobile braking control system according to claim 2, wherein said engine operating parameters include engine speed and engine water temperature; The control module judges whether the engine water temperature and engine speed meet the preset threshold value. If at least one of the engine water temperature and engine speed does not meet the preset threshold value, a boost command is sent. If the engine water temperature and engine speed meet If the threshold value is preset, the booster command and the first alarm command will be sent. 5. The vehicle braking control system according to claim 1, wherein the first detection module periodically detects the vacuum degree in the vacuum booster. 6. The automobile brake control system according to claim 1, wherein the preset vacuum degree threshold value includes a first vacuum degree preset threshold value, a second vacuum degree preset threshold value, and a second vacuum degree preset threshold value that increase sequentially. Limit and third vacuum preset threshold; When the control module judges that the vacuum degree in the vacuum booster is less than the first vacuum degree preset threshold value, send a first pressurization instruction; When the control module judges that the vacuum degree in the vacuum booster is greater than or equal to the first vacuum degree preset threshold value and less than the second vacuum degree preset threshold value, a second pressurization instruction is sent; When the control module judges that the vacuum degree in the vacuum booster is greater than or equal to the second vacuum degree preset threshold value and less than the third vacuum degree preset threshold value, the control module sends a third boosting command; When the control module judges that the vacuum degree in the vacuum booster is greater than or equal to the third vacuum degree preset threshold value, the braking control of the control module is terminated; The boost pressure controlled by the first boost command, the second boost command and the third boost command increases sequentially in a gradient; The supercharging module completes supercharging with a gradient increase according to the first supercharging instruction, the second supercharging instruction and the third supercharging instruction. 7. The vehicle braking control system according to claim 1, further comprising: The fourth detection module is used to detect and output the vehicle speed to the control module; After the supercharging module controls the brake to perform braking, the control module judges whether the vehicle speed is zero, if yes, the control module stops sending the supercharging command, and if not, the control module continues to send the supercharging command; The supercharging module continues supercharging and controls the brake to perform braking according to the supercharging instruction until the supercharging instruction is released or the vehicle speed is zero. 8. The vehicle brake control system according to claim 1, further comprising: The fifth detection module is used to detect and output the vacuum degree in the engine manifold to the control module; The control module judges whether the difference between the vacuum degree in the vacuum booster and the vacuum degree in the engine manifold is greater than a preset threshold value, if yes, sends a second alarm command and stores the fault code, if no, judges terminate; and The alarm unit is configured to alarm according to the second alarm instruction. 9. The vehicle braking control system according to claim 1, characterized in that the control module is a control module in a vehicle electronic stability system. 10. The automobile brake control system according to claim 1, further comprising a shutdown execution module, the control module is connected to an air conditioner switch through a signal line to obtain an air conditioner on/off signal; After the control module judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree, and before sending the pressurization command, the control module judges whether the air conditioner is turned on, and if the air conditioner is turned on, then sends a shutdown command, The shutdown execution module turns off the air conditioner according to the shutdown command. When the air conditioner is turned off, the control module continues to judge whether the vacuum degree of the vacuum booster is less than the vacuum degree preset threshold value. If the vacuum degree of the vacuum booster is not less than the vacuum degree preset threshold value limit value, the brake control is terminated, and if the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, a boost command is sent. 11. A control method for an automobile brake control system according to claim 1, comprising the following steps: Receive braking signal; Detect the vacuum degree in the vacuum booster; Judging whether the vacuum degree of the vacuum booster is less than the preset threshold value of the vacuum degree, if not, the brake control is terminated, and if it is, a boost command is sent; The brake is controlled to perform braking according to the boost command. 12. The control method of the automobile braking control system according to claim 11, wherein the control module sends a pressure boost after determining that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree. Before the instruction, it is judged whether the engine operating parameters meet the preset requirements, if the engine operating parameters do not meet the preset requirements, a boost command is sent, and if the engine operating parameters meet the preset requirements, a boost command and the first alarm command are sent; The alarm is executed according to the first alarm instruction. 13. The control method of the automobile braking control system according to claim 11, wherein the control module sends a pressure boost after determining that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree. Before the command, judge whether the ambient air pressure meets the preset requirements, if not, send a boost command, if yes, send a boost command and the first alarm command; The alarm is executed according to the first alarm instruction. 14. The control method of the automobile brake control system according to claim 12, wherein the specific judgment on the engine operating parameters is: judging whether the engine speed and the engine water temperature meet the preset threshold value, if the engine speed and the engine water temperature If at least one of the water temperatures does not meet the preset threshold value, a boost command is sent, and if the engine speed and the engine water temperature both meet the preset threshold value, a boost command and a first alarm command are sent. 15. The control method of the automobile braking control system according to claim 11, characterized in that the vacuum degree in the vacuum booster is judged, when the vacuum degree in the vacuum booster is less than the first vacuum degree preset threshold value, send the first boost command; when the vacuum in the vacuum booster is greater than or equal to the first vacuum preset threshold value and less than the second vacuum preset threshold value, send the second boost command; When the vacuum degree in the vacuum booster is greater than or equal to the second vacuum degree preset threshold value and less than the third vacuum degree preset threshold value, a third boost instruction is sent; when the vacuum degree in the vacuum booster is greater than or When it is equal to the preset threshold value of the third vacuum degree, the braking control is terminated; The boost pressures controlled by the first boost command, the second boost command and the third boost command increase sequentially in a gradient. 16. The control method of the automobile braking control system according to claim 11, further comprising detecting the vacuum degree in the engine manifold, and judging whether the difference between the vacuum degree in the vacuum booster and the vacuum degree of the engine manifold is greater than If the preset threshold value is yes, then send a second alarm command and store the fault code, and alarm according to the second alarm command, if it is no, then the judgment is terminated. 17. The control method of the automobile braking control system according to claim 11, further comprising judging the difference between the vacuum degree in the vacuum booster detected this time and the vacuum degree in the vacuum booster detected last time Whether it is greater than the preset threshold value, if yes, send a third alarm command and store the fault code, and alarm according to the third alarm command, if no, then the judgment is terminated. 18. The control method of the vehicle brake control system according to claim 11, characterized in that, after the control module judges that the vacuum degree in the vacuum booster is less than the preset threshold value of the vacuum degree, and after sending the pressure boost Before the instruction, judge whether the air conditioner is on. If the air conditioner is on, turn off the air conditioner and continue to judge whether the vacuum degree in the vacuum booster is less than the vacuum degree preset threshold value. If the vacuum degree in the vacuum booster is less than the vacuum degree preset threshold value , to send a pressurization command, if the vacuum degree in the vacuum booster is greater than or equal to the preset threshold value of the vacuum degree, the brake control is terminated.