CN113511182A - EPBi emergency braking control method and device and automobile - Google Patents
EPBi emergency braking control method and device and automobile Download PDFInfo
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- CN113511182A CN113511182A CN202110602364.7A CN202110602364A CN113511182A CN 113511182 A CN113511182 A CN 113511182A CN 202110602364 A CN202110602364 A CN 202110602364A CN 113511182 A CN113511182 A CN 113511182A
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- vehicle
- epbi
- angular displacement
- brake pedal
- automatic control
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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
Abstract
The invention provides an EPBi emergency braking control method and device when transmission of brake hydraulic pressure of an automobile fails and the automobile. The EPBi emergency automatic control method comprises the following steps: collecting the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle; judging whether the vehicle has brake hydraulic transmission failure or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle; and if so, activating an automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal, so that the electronic clamp of the EPBi system performs clamping braking.
Description
Technical Field
The invention relates to a control logic of a brake system, in particular to a control method for identifying the failure working condition of automobile brake hydraulic transmission (pipeline/master cylinder) by EPBi so as to control EPB to perform emergency braking.
Background
The current passenger car braking system relies on hydraulic oil to transmit braking force, and hydraulic transmission failure (main cylinder can not build pressure, pipeline damage and the like) is a serious failure mode and can endanger driving safety.
The EPBi dynamic braking function requires a driver to pull the parking switch for a long time to realize dynamic parking, and has serious hysteresis (the long-pull parking switch is generally set for more than 5 seconds). The function cannot quickly respond to the braking request of a driver, and the driver can forget the function because the first reaction is to step on a brake pedal in an emergency.
Disclosure of Invention
The invention discloses an EPBi emergency braking control method and device for failure of automobile brake hydraulic transmission and an automobile.
The technical scheme of the invention is as follows:
the embodiment of the invention provides an EPBi emergency automatic control method, which comprises the following steps:
collecting the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle;
judging whether the vehicle has brake hydraulic transmission failure or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle;
and if so, activating an automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal, so that the electronic clamp of the EPBi system performs clamping braking.
Preferably, the step of determining whether the brake hydraulic pressure transmission failure occurs to the vehicle based on the brake pedal angular displacement, the master cylinder pressure and the entire vehicle deceleration includes:
and if the brake pedal angular displacement is greater than or equal to a first preset displacement, the master cylinder pressure is less than or equal to a preset pressure, and the whole vehicle deceleration is less than or equal to a preset percentage of the deceleration corresponding to the brake pedal angular displacement, determining that the vehicle has brake hydraulic transmission failure.
Preferably, the step of activating the EPBi system automatic control function based on the current vehicle speed of the vehicle and the brake pedal angular displacement, so that the electronic clamp of the EPBi system performs clamping braking comprises:
and if the angular displacement of the brake pedal is greater than or equal to a first preset displacement and the current speed of the vehicle is less than or equal to a preset speed, controlling the electronic clamp of the EPBi system to clamp and brake with the maximum clamping force.
Preferably, the method further comprises:
and after the EPBi system automatic control function is activated, if the angular displacement of the brake pedal is less than or equal to a second preset displacement and the current opening degree of the accelerator pedal of the vehicle is greater than or equal to a preset value, exiting the EPBi system automatic control function.
The embodiment of the invention also provides an EPBi emergency automatic control device, which comprises:
the acquisition module is used for acquiring the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle;
the judging module is used for judging whether the brake hydraulic transmission failure occurs to the vehicle or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle;
and the activation module is used for activating the automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal if the vehicle is in the emergency, so that the electronic clamp of the EPBi system can clamp and brake.
The embodiment of the invention also provides an automobile which comprises the EPBi emergency automatic control device.
The invention has the beneficial effects that:
the scheme analyzes the angular displacement of the brake pedal, the deceleration of the vehicle and the pressure of the master cylinder and judges whether the hydraulic transmission of the vehicle fails or not, thereby controlling the EPB to clamp and provide the driving braking force.
Drawings
FIG. 1 is a logic control diagram of an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an EPBi emergency brake control method when the transmission of brake hydraulic pressure of an automobile fails, which calibrates the automatic control function of an EPBi system of the EPBi system in advance, and establishes a corresponding curve chart of a brake pedal angular displacement signal omega, a main cylinder pressure P, a finished automobile deceleration a and the automatic control function of the EPBi system in advance. The EPBi system automatic control functions corresponding to the vertical brake pedal angular displacement omega, the main cylinder pressure P and the whole vehicle deceleration a of different vehicle types are different.
Referring to fig. 1, in order to implement the method described above, the following operations need to be performed in the embodiment of the present invention. The EPBi system monitors the current angular displacement omega of a brake pedal, the pressure P of a main cylinder, the deceleration a of the whole vehicle, the speed V of the vehicle and the opening theta of an accelerator pedal in real time, judges that the transmission of the brake hydraulic pressure of the vehicle is failed when the following conditions are met, and activates the automatic control function of the EPBi system:
omega is more than or equal to 20 percent (the first preset displacement can be determined according to the matching of the real vehicle);
p is less than or equal to 1.5MPa (preset pressure which can be confirmed according to real vehicle calibration);
a is less than or equal to 50 percent (preset percentage) of the deceleration corresponding to the current pedal position (can be confirmed according to the real vehicle calibration);
the other functions of EPBi are not activated.
The EPBi system has the advantages that the automatic control function of the EPBi system is activated, the EPBi system controls the electronic calipers EPB of the EPBi system to clamp and brake, the electronic calipers and the ABS function configured with the ABS system act together to realize brake deceleration, and in the function execution process:
if omega is more than or equal to 20 percent (a first preset value) and the vehicle speed is less than or equal to 3km/h (a preset vehicle speed), the electronic calipers park with the maximum clamping force;
and if the omega is less than or equal to 5 percent (a second preset value) and the opening degree of the accelerator pedal is more than or equal to 10 percent (a preset value), the function is quitted.
The embodiment of the invention also provides an EPBi emergency automatic control device, which comprises:
the acquisition module is used for acquiring the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle;
the judging module is used for judging whether the brake hydraulic transmission failure occurs to the vehicle or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle;
and the activation module is used for activating the automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal if the vehicle is in the emergency, so that the electronic clamp of the EPBi system can clamp and brake.
The embodiment of the invention also provides an automobile which comprises the EPBi emergency automatic control device.
Claims (6)
1. An EPBi emergency automatic control method is characterized by comprising the following steps:
collecting the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle;
judging whether the vehicle has brake hydraulic transmission failure or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle;
and if so, activating an automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal, so that the electronic clamp of the EPBi system performs clamping braking.
2. The method according to claim 1, wherein the step of determining whether the brake hydraulic pressure transmission failure occurs in the vehicle based on the brake pedal angular displacement, the master cylinder pressure, and the entire vehicle deceleration includes:
and if the brake pedal angular displacement is greater than or equal to a first preset displacement, the master cylinder pressure is less than or equal to a preset pressure, and the whole vehicle deceleration is less than or equal to a preset percentage of the deceleration corresponding to the brake pedal angular displacement, determining that the vehicle has brake hydraulic transmission failure.
3. The method of claim 1, wherein activating the EPBi system automatic control function based on the current vehicle speed of the vehicle and the brake pedal angular displacement causes the electronic clamp of the EPBi system to perform the clamping braking, comprises:
and if the angular displacement of the brake pedal is greater than or equal to a first preset displacement and the current speed of the vehicle is less than or equal to a preset speed, controlling the electronic clamp of the EPBi system to clamp and brake with the maximum clamping force.
4. The method of claim 1, further comprising:
and after the EPBi system automatic control function is activated, if the angular displacement of the brake pedal is less than or equal to a second preset displacement and the current opening degree of the accelerator pedal of the vehicle is greater than or equal to a preset value, exiting the EPBi system automatic control function.
5. An EPBi emergency automatic control device is characterized by comprising:
the acquisition module is used for acquiring the angular displacement of a brake pedal of a vehicle, the pressure of a main cylinder and the deceleration of the whole vehicle;
the judging module is used for judging whether the brake hydraulic transmission failure occurs to the vehicle or not based on the angular displacement of the brake pedal, the pressure of the master cylinder and the deceleration of the whole vehicle;
and the activation module is used for activating the automatic control function of the EPBi system based on the current speed of the vehicle and the angular displacement of the brake pedal if the vehicle is in the emergency, so that the electronic clamp of the EPBi system can clamp and brake.
6. An automobile comprising the EPBi emergency automatic control device according to claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602364.7A CN113511182A (en) | 2021-05-31 | 2021-05-31 | EPBi emergency braking control method and device and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602364.7A CN113511182A (en) | 2021-05-31 | 2021-05-31 | EPBi emergency braking control method and device and automobile |
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| CN113511182A true CN113511182A (en) | 2021-10-19 |
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| CN202110602364.7A Pending CN113511182A (en) | 2021-05-31 | 2021-05-31 | EPBi emergency braking control method and device and automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802165A (en) * | 2022-05-05 | 2022-07-29 | 江铃汽车股份有限公司 | Vehicle braking method, device, equipment and storage medium |
| CN115230670A (en) * | 2022-08-24 | 2022-10-25 | 奇瑞汽车股份有限公司 | Method and device for warning of insufficient braking force of vehicle, vehicle and storage medium |
| CN115402284A (en) * | 2022-08-30 | 2022-11-29 | 浙江吉利控股集团有限公司 | Vehicle brake control method, vehicle brake control system, vehicle, and storage medium |
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Application publication date: 20211019 |