CN114715100A - Compensation control method for vehicle hydraulic braking - Google Patents
Compensation control method for vehicle hydraulic braking Download PDFInfo
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- CN114715100A CN114715100A CN202210531302.6A CN202210531302A CN114715100A CN 114715100 A CN114715100 A CN 114715100A CN 202210531302 A CN202210531302 A CN 202210531302A CN 114715100 A CN114715100 A CN 114715100A
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- vehicle
- brake
- compensation
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- pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention provides a compensation control method for vehicle hydraulic braking, which comprises the following steps: collecting and monitoring vehicle status signals in real time, the vehicle status signals including: a brake pedal switch signal, a master cylinder pressure signal, a vehicle deceleration signal, and an ABS no-fault signal. When the fact that the pressure of a master cylinder reaches the locking pressure under the normal condition when a driver presses a brake pedal is monitored, but no fault signal exists in the ABS of the vehicle but the ABS is not activated at the moment, and the deceleration of the vehicle is lower than a set threshold value, it is judged that the brake system of the vehicle is in a decline state at the moment. And after the vehicle braking system is in a fading state, acquiring the current vehicle speed of the vehicle, and if the current vehicle speed is greater than a set vehicle speed threshold value, performing hydraulic braking fading compensation. The invention can reduce the braking distance of the vehicle and improve the running safety of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle hydraulic braking, in particular to a compensation control method for vehicle hydraulic braking.
Background
With the development of automobile technology, the performance requirements of the brake system are higher and higher. The current braking system is hydraulic braking, hydraulic pressure is generated by an actuating device according to driver requirements or external requirements and is transmitted to a wheel brake through a pipeline and a regulating device, the brake hydraulic pressure enables a friction plate of the brake to tightly press a brake disc, friction torque is generated, kinetic energy of a vehicle is converted into heat energy through friction, the purpose of speed reduction braking is achieved, and the hydraulic braking has several problems. After frequent braking, the temperatures of the brake disc and the friction plate can rise quickly, if the braking is too frequent, the braking strength is too high, or the heat dissipation of the brake disc of the brake is poor, the temperatures of the brake disc and the friction plate can rise sharply, and after the temperature of the friction pair rises, the friction coefficient is reduced, the braking performance is reduced, and the braking distance is lengthened. The common working condition is that the vehicle continuously brakes on a long slope, so that the temperature of a brake disc and a friction plate is overhigh, and the braking performance is declined. Other conditions that result in a reduction in the coefficient of friction between the brake disk and the friction plate, such as oil splash on the brake disk. Therefore, how to perform compensation control on the hydraulic brake of the vehicle to avoid the brake failure has important significance.
Disclosure of Invention
The invention provides a compensation control method for vehicle hydraulic braking, which solves the problem that the braking performance of the existing vehicle hydraulic braking is reduced when the temperature of a brake disc is too high or the load of a vehicle is high, can reduce the braking distance of the vehicle, and improves the running safety of the vehicle.
In order to achieve the above purpose, the invention provides the following technical scheme:
a compensation control method of a hydraulic brake of a vehicle, comprising:
collecting and monitoring vehicle status signals in real time, the vehicle status signals including: a brake pedal switch signal, a brake master cylinder pressure signal, a vehicle deceleration signal and an ABS no-fault signal;
when the fact that a driver steps on a brake pedal is monitored, the pressure of a master cylinder reaches the locking pressure under the normal condition, but the ABS of the vehicle is not activated without a fault signal at the moment, and the deceleration of the vehicle is lower than a set threshold value, it is judged that a vehicle brake system is in a decline state at the moment;
and after the vehicle braking system is in a fading state, acquiring the current vehicle speed of the vehicle, and if the current vehicle speed is greater than a set vehicle speed threshold value, performing hydraulic braking fading compensation.
Preferably, the method further comprises the following steps:
acquiring the wheel speed of a rear wheel of the vehicle, and judging whether the vehicle needs to enter rear wheel hydraulic compensation or not according to the current vehicle speed and the wheel speed of the rear wheel;
and if the wheel speed of the rear wheel is greater than the set wheel speed threshold when the vehicle braking system is in a decline state, judging that the braking force of the rear axle of the vehicle does not reach the ABS intervention threshold, and entering rear wheel hydraulic compensation.
Preferably, the determining whether the rear wheel hydraulic braking compensation needs to be activated includes:
when the ABS is monitored to be activated but the wheels of the rear axle are not locked, hydraulic brake compensation of the rear wheels is activated to compensate the brake pressure of the rear axle, so that the brake pressure of the wheels of the rear axle is increased to the locking pressure level.
Preferably, the method further comprises the following steps:
and when the current vehicle speed is less than a set vehicle speed threshold value and the rear wheel speed is equal to 0, judging that the vehicle meets a rear wheel hydraulic compensation quit condition, and further controlling the vehicle to quit the rear wheel hydraulic compensation.
Preferably, the method further comprises the following steps:
and when the driver releases the brake pedal, the current vehicle speed is less than a set speed threshold value or the ABS system has a fault, controlling the vehicle to quit the hydraulic brake compensation.
Preferably, the performing of the hydraulic brake fade compensation includes:
the brake pressure is compensated to the brake locking pressure after the decline or the brake pressure is compensated until the ABS is activated.
Preferably, the rear wheel hydraulic pressure compensation comprises:
boosting the rear axle vehicle through a driving pump so that the rear axle braking force reaches an ABS intervention threshold value;
or the pressure of the brake master cylinder is increased by adding the driving motor, so that the brake pressure of the rear axle vehicle is increased to a locking pressure level.
Preferably, the hydraulic brake compensation module and the rear wheel hydraulic compensation module are integrated in the body stabilization system, in the electric booster or in the brake control unit.
The invention provides a compensation control method for vehicle hydraulic braking, which adopts real-time acquisition and monitoring of vehicle homomorphic signals to judge whether a vehicle braking system is in a decline state or not and activates hydraulic braking decline compensation according to the current vehicle speed of a vehicle when the vehicle braking system is in the decline state. The problem of current vehicle hydraulic braking have the brake performance when the brake disc temperature is too high or the vehicle high load and reduce is solved, can reduce vehicle braking distance, improve the security of vehicle operation.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
Fig. 1 is a schematic diagram of a compensation control method for hydraulic braking of a vehicle according to the present invention.
Fig. 2 is a flowchart of a compensation control of a hydraulic brake of a vehicle according to the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The invention provides a compensation control method for vehicle hydraulic braking, which aims to solve the problem that the braking performance of the existing vehicle hydraulic braking is reduced when the temperature of a brake disc is too high or the load of the vehicle is the same as the high load, and the braking distance of the vehicle is prolonged.
As shown in fig. 1 and 2, a compensation control method of a hydraulic brake of a vehicle includes:
s1: collecting and monitoring vehicle status signals in real time, the vehicle status signals including: a brake pedal switch signal, a brake master cylinder pressure signal, a vehicle deceleration signal and an ABS no-fault signal;
s2: when the fact that a driver steps on a brake pedal is monitored, the pressure of a master cylinder reaches the locking pressure under the normal condition, but the ABS of the vehicle is not activated without a fault signal at the moment, and the deceleration of the vehicle is lower than a set threshold value, it is judged that a vehicle brake system is in a decline state at the moment;
s3: and after the vehicle braking system is in a fading state, acquiring the current vehicle speed of the vehicle, and if the current vehicle speed is greater than a set vehicle speed threshold value, performing hydraulic braking fading compensation.
Specifically, brake fade recognition is performed in real time, and the judgment signals include a brake pedal switch signal, a brake master cylinder pressure, an ABS activation state, vehicle deceleration and the like. When the fact that a driver steps on a brake pedal is monitored, the master cylinder pressure MPC reaches the locking pressure under the normal condition, but the ABS of the vehicle is not activated when the ABS is not in fault, and the deceleration of the vehicle is lower than a set threshold value, it is judged that a brake system is in a decline state at the moment.
The brake system recession judgment conditions are as follows:
the brake pedal switch is triggered to indicate that the driver steps on the brake pedal.
And the pressure of the brake master cylinder is greater than a set pressure threshold value.
And thirdly, the ABS is not activated.
And fourthly, the deceleration of the vehicle is lower than the set deceleration threshold value.
And when the brake system is in the decline state, confirming whether hydraulic brake decline compensation is carried out or not by combining information such as vehicle speed and the like. And when the system judges that the braking system is degraded, if the vehicle speed is greater than a set threshold value (which can be calibrated, such as 15km/h), performing hydraulic braking degradation compensation. The method can improve the braking performance when the temperature of the brake disc is too high and heat fading occurs or the friction coefficient of the friction plate is reduced by providing hydraulic braking compensation. The problem that the braking distance of the vehicle is lengthened because the braking force of the rear axle does not reach the ABS intervention level when the vehicle is in a high load state, the vehicle cannot reach the maximum deceleration, the braking distance of the vehicle can be reduced, and the running safety of the vehicle is improved.
The method further comprises the following steps:
s4: acquiring the wheel speed of a rear wheel of the vehicle, and judging whether the vehicle needs to enter rear wheel hydraulic compensation or not according to the current vehicle speed and the wheel speed of the rear wheel;
s5: and if the wheel speed of the rear wheel is greater than the set wheel speed threshold when the vehicle braking system is in a decline state, judging that the braking force of the rear axle of the vehicle does not reach the ABS intervention threshold, and entering rear wheel hydraulic compensation.
Further, the determining whether the rear wheel hydraulic braking compensation needs to be activated includes: when the ABS is monitored to be activated but the wheels of the rear axle are not locked, hydraulic brake compensation of the rear wheels is activated to compensate the brake pressure of the rear axle, so that the brake pressure of the wheels of the rear axle is increased to the locking pressure level.
Specifically, the hydraulic brake compensation function also has a rear wheel hydraulic compensation function, under the full-braking working condition, the front axle wheels enter the ABS regulation, but when the rear wheel brake pressure is not enough to enable the rear axle wheels to enter the ABS control, the brake pressure or the rear axle brake pressure is compensated, so that the rear axle wheels rapidly enter the ABS regulation, the whole vehicle brake force is improved, and the brake distance is reduced. When the ABS is monitored to be activated, but the rear axle wheels are not locked, the hydraulic brake compensation function of the rear wheels is activated to compensate the brake pressure of the rear axles, and the brake pressure of the rear axle wheels is increased to the locking pressure level, so that the rear axle wheels quickly enter the ABS for adjustment.
The method further comprises the following steps: and when the current vehicle speed is less than a set vehicle speed threshold value and the rear wheel speed is equal to 0, judging that the vehicle meets a rear wheel hydraulic compensation quit condition, and further controlling the vehicle to quit the rear wheel hydraulic compensation.
The method further comprises the following steps: and when the driver releases the brake pedal, the current vehicle speed is less than a set speed threshold value or the ABS system has a fault, controlling the vehicle to quit the hydraulic brake compensation.
Specifically, hydraulic brake compensation is exited when a condition is monitored as not being met or the system is malfunctioning. When the situation that the driver looses and releases the brake pedal or the vehicle speed is lower than a set vehicle speed threshold value is monitored, hydraulic brake compensation is quitted; or when the ABS system is monitored to have faults, or the wheel speed sensor has faults, or signals required by the system have faults, the hydraulic brake compensation is quitted.
Further, the performing hydraulic brake fade compensation includes: the brake pressure is compensated to the brake locking pressure after the decline or the brake pressure is compensated until the ABS is activated.
Specifically, there are two ways of compensation,
the first method is as follows: the brake pressure is compensated to the brake lock pressure after the decline. The brake locking pressure under normal conditions and the brake locking pressure after decay are obtained by calibration matching.
The second method comprises the following steps: the brake pressure is compensated until the ABS is activated, wherein no failure of the ABS is a prerequisite.
Further, the rear wheel hydraulic compensation includes: boosting the rear axle vehicle through a driving pump so that the rear axle braking force reaches an ABS intervention threshold value; or the pressure of the brake master cylinder is increased by adding the driving motor, so that the brake pressure of the rear axle vehicle is increased to a locking pressure level.
Specifically, there are two ways for rear wheel hydraulic brake compensation:
in the first mode, when the hydraulic brake module is placed in the vehicle body stability control unit ESC or the intelligent integrated brake control unit IPB, the pressurization of the rear axle wheels is realized by driving a pump and a corresponding electromagnetic valve.
And in a second mode, when the hydraulic brake compensation module is placed in the electric booster eBooster, the pressure of a brake main cylinder is increased by adding a driving motor, so that the brake pressure of rear axle wheels is increased to a locking pressure level.
Furthermore, the hydraulic brake compensation module and the rear wheel hydraulic compensation module are integrated in the vehicle body stabilization system, in the electric booster or in the brake control unit.
In practical application, a signal acquisition and monitoring module is arranged to acquire and monitor vehicle state signals in real time, wherein the vehicle state signals comprise brake pedal switch signals, brake master cylinder pressure signals, vehicle speed and wheel speed signals, vehicle deceleration signals, ABS fault and activation state signals and the like. And a brake system recession identification module is arranged for identifying the recession of the brake in real time, and the judgment signals comprise a brake pedal switching signal, the pressure of a brake master cylinder, the ABS activation state, the vehicle deceleration and the like. And 3) a hydraulic brake recession compensation module is arranged, and when the brake system is judged to be in a recession state, the hydraulic brake recession compensation is determined by combining information such as vehicle speed and the like. The hydraulic brake compensation module can be integrated in a vehicle body stabilizing system ESC, or integrated in an electric booster eBooster, or integrated in an intelligent integrated brake control unit IPB.
Therefore, the invention provides a compensation control method for vehicle hydraulic braking, which adopts real-time acquisition and monitoring of vehicle same-state signals to judge whether a vehicle braking system is in a decline state, and activates hydraulic braking decline compensation according to the current vehicle speed of a vehicle when the vehicle braking system is in the decline state. The problem of current vehicle hydraulic braking have the brake performance when the brake disc temperature is too high or the vehicle high load and reduce is solved, can reduce vehicle braking distance, improve the security of vehicle operation.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (8)
1. A compensation control method of a hydraulic brake of a vehicle, characterized by comprising:
collecting and monitoring vehicle status signals in real time, the vehicle status signals including: a brake pedal switch signal, a brake master cylinder pressure signal, a vehicle deceleration signal and an ABS no-fault signal;
when the fact that a driver steps on a brake pedal is monitored, the pressure of a master cylinder reaches the locking pressure under the normal condition, but the ABS of the vehicle is not activated without a fault signal at the moment, and the deceleration of the vehicle is lower than a set threshold value, it is judged that a vehicle brake system is in a decline state at the moment;
and after the vehicle braking system is in a decline state, acquiring the current vehicle speed of the vehicle, and if the current vehicle speed is greater than a set vehicle speed threshold value, performing hydraulic braking decline compensation.
2. The compensation control method of a hydraulic brake of a vehicle according to claim 1, characterized by further comprising:
acquiring the wheel speed of a rear wheel of the vehicle, and judging whether the vehicle needs to enter rear wheel hydraulic compensation or not according to the current vehicle speed and the wheel speed of the rear wheel;
and if the wheel speed of the rear wheel is greater than the set wheel speed threshold when the vehicle braking system is in a decline state, judging that the braking force of the rear axle of the vehicle does not reach the ABS intervention threshold, and entering rear wheel hydraulic compensation.
3. The compensation control method of hydraulic braking of a vehicle according to claim 2, wherein the determining whether or not the rear wheel hydraulic braking compensation needs to be activated includes:
when the ABS is monitored to be activated but the wheels of the rear axle are not locked, hydraulic brake compensation of the rear wheels is activated to compensate the brake pressure of the rear axle, so that the brake pressure of the wheels of the rear axle is increased to the locking pressure level.
4. The compensation control method of a hydraulic brake of a vehicle according to claim 3, characterized by further comprising:
and when the current vehicle speed is less than a set vehicle speed threshold value and the rear wheel speed is equal to 0, judging that the vehicle meets a rear wheel hydraulic compensation quit condition, and further controlling the vehicle to quit the rear wheel hydraulic compensation.
5. The compensation control method of a hydraulic brake of a vehicle according to claim 4, characterized by further comprising:
and when the driver releases the brake pedal, the current vehicle speed is less than a set speed threshold value or the ABS system has a fault, controlling the vehicle to quit the hydraulic brake compensation.
6. The compensation control method of hydraulic braking of a vehicle according to claim 5, wherein the performing hydraulic brake fade compensation includes:
the brake pressure is compensated to the brake locking pressure after the decline or the brake pressure is compensated until the ABS is activated.
7. The compensation control method of a hydraulic brake of a vehicle according to claim 6, wherein the rear wheel hydraulic pressure compensation includes:
boosting the rear axle vehicle through a driving pump so as to enable the rear axle braking force to reach an ABS intervention threshold value;
or the pressure of the brake master cylinder is increased by adding the driving motor, so that the brake pressure of the rear axle vehicle is increased to a locking pressure level.
8. The compensation control method of a hydraulic brake of a vehicle according to claim 7, characterized in that the hydraulic brake compensation module and the rear wheel hydraulic pressure compensation module are integrated in a vehicle body stabilization system, in an electric booster or in a brake control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531302.6A CN114715100B (en) | 2022-05-16 | 2022-05-16 | Compensation control method for hydraulic braking of vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531302.6A CN114715100B (en) | 2022-05-16 | 2022-05-16 | Compensation control method for hydraulic braking of vehicle |
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| CN114715100A true CN114715100A (en) | 2022-07-08 |
| CN114715100B CN114715100B (en) | 2023-04-25 |
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| CN202210531302.6A Active CN114715100B (en) | 2022-05-16 | 2022-05-16 | Compensation control method for hydraulic braking of vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115771497A (en) * | 2022-11-30 | 2023-03-10 | 华南理工大学 | Brake heat fading compensation control method based on brake pressure control |
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| JP2002193090A (en) * | 2000-12-25 | 2002-07-10 | Aisin Seiki Co Ltd | Vehicular brake device |
| JP2013071714A (en) * | 2011-09-29 | 2013-04-22 | Hitachi Automotive Systems Ltd | Brake system |
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| KR20160087499A (en) * | 2015-01-14 | 2016-07-22 | 주식회사 만도 | Brake system control apparatus and control method |
| CN108860111A (en) * | 2018-06-28 | 2018-11-23 | 北京新能源汽车股份有限公司 | A kind of hydraulic braking decline compensating control method, device and automobile |
| CN109398334A (en) * | 2018-12-29 | 2019-03-01 | 芜湖伯特利汽车安全***股份有限公司 | A kind of control method and system promoting motor vehicle service brake safety based on parking braking |
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2022
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002193090A (en) * | 2000-12-25 | 2002-07-10 | Aisin Seiki Co Ltd | Vehicular brake device |
| CN103328290A (en) * | 2011-01-24 | 2013-09-25 | 丰田自动车株式会社 | Brake fade determination device, brake fade determination method and braking system |
| JP2013071714A (en) * | 2011-09-29 | 2013-04-22 | Hitachi Automotive Systems Ltd | Brake system |
| KR20160087499A (en) * | 2015-01-14 | 2016-07-22 | 주식회사 만도 | Brake system control apparatus and control method |
| CN108860111A (en) * | 2018-06-28 | 2018-11-23 | 北京新能源汽车股份有限公司 | A kind of hydraulic braking decline compensating control method, device and automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115771497A (en) * | 2022-11-30 | 2023-03-10 | 华南理工大学 | Brake heat fading compensation control method based on brake pressure control |
| CN115771497B (en) * | 2022-11-30 | 2024-04-23 | 华南理工大学 | Brake heat fading compensation control method based on brake pressure control |
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| CN114715100B (en) | 2023-04-25 |
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