CN113460020A - Vehicle braking control method and control system based on braking capability - Google Patents
Vehicle braking control method and control system based on braking capability Download PDFInfo
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- CN113460020A CN113460020A CN202110742683.8A CN202110742683A CN113460020A CN 113460020 A CN113460020 A CN 113460020A CN 202110742683 A CN202110742683 A CN 202110742683A CN 113460020 A CN113460020 A CN 113460020A
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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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- Regulating Braking Force (AREA)
Abstract
The invention discloses a vehicle braking control method and a vehicle braking control system based on braking capacity, wherein the control method comprises the following steps: acquiring the temperature of a brake disc, inquiring a temperature-braking capacity table according to the temperature of the brake disc, and determining the corresponding braking capacity; when the braking capacity is smaller than or equal to a preset first braking capacity threshold value, a braking capacity display request is sent to the instrument; when the braking capacity is smaller than or equal to a preset second braking capacity threshold value, determining the torque reduction percentage of the engine according to the braking capacity; and sending a torque reduction request and the engine torque reduction percentage to an engine controller, and acquiring torque reduction execution information returned by the engine controller. The invention can ensure safe braking force and reduce safety risk.
Description
Technical Field
The invention belongs to the field of brake control, and particularly relates to a vehicle brake control method and a vehicle brake control system based on brake capacity.
Background
In the whole vehicle braking system, the braking force is mainly decelerated to stop by the friction force generated by the friction plate and the brake disc, and the functions of vehicle deceleration and vehicle stop are carried out. In the process of the service braking of the whole automobile, the brake block and the brake disc rub with each other, and the automobile is decelerated and stopped by the friction force generated by the brake block and the brake disc.
Because the brake block and the brake disc carry out high-strength and high-frequency friction motion, the temperature of the brake disc is increased violently, under the condition of different temperatures, the brake capacity is different, the brake distance reflected to the vehicle is also changed, and the safety risk may occur when the driver cannot predict the brake distance.
Disclosure of Invention
The invention aims to provide a vehicle braking control method and a vehicle braking control system based on braking capacity, so as to ensure safe braking force and reduce safety risk.
The invention discloses a vehicle brake control method based on braking capacity, which comprises the following steps:
acquiring the temperature of a brake disc, inquiring a temperature-braking capacity table according to the temperature of the brake disc, and determining the corresponding braking capacity;
when the braking capacity is smaller than or equal to a preset first braking capacity threshold value, a braking capacity display request is sent to an instrument;
when the braking capacity is smaller than or equal to a preset second braking capacity threshold value, determining the torque reduction percentage of the engine according to the braking capacity;
sending a torque reduction request and the torque reduction percentage of the engine to an engine controller, and acquiring torque reduction execution information returned by the engine controller;
the temperature-braking capacity meter is a corresponding relation meter of the brake disc temperature and the braking capacity obtained in a calibration mode, and the preset first braking capacity threshold is larger than the preset second braking capacity threshold.
Preferably, if the braking capacity of the vehicle after the vehicle continuously runs on the preset downhill road condition for the preset time is greater than a preset third braking capacity threshold value and less than or equal to a preset second braking capacity threshold value, a yellow light display warning request is sent to the instrument; and if the braking capacity of the vehicle after the vehicle continuously runs for the preset time on the preset downhill road condition is less than or equal to the preset third braking capacity threshold value, sending a red light display warning request to the instrument.
Preferably, the percentage of torque reduction of the engine determined according to the braking capability is specifically as follows:
if the braking capacity is larger than a preset fourth braking capacity threshold and smaller than or equal to a preset second braking capacity threshold, determining that the torque reduction percentage of the engine is a preset first percentage;
if the braking capacity is larger than a preset fifth braking capacity threshold and smaller than or equal to a preset fourth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset second percentage;
if the braking capacity is larger than a preset sixth braking capacity threshold and smaller than or equal to a preset fifth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset third percentage;
if the braking capacity is larger than a preset seventh braking capacity threshold and smaller than or equal to a preset sixth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset fourth percentage;
if the braking capacity is smaller than or equal to a preset seventh braking capacity threshold value, determining that the torque reduction percentage of the engine is a preset fifth percentage;
the preset first percentage is smaller than the preset second percentage, the preset second percentage is smaller than the preset third percentage, the preset third percentage is smaller than the preset fourth percentage, and the preset fourth percentage is smaller than the preset fifth percentage.
Preferably, the corresponding relation table of the brake disc temperature and the braking capacity is obtained by calibrating in the following way:
selecting three running-in vehicles, releasing the brakes when the brake is stepped until the temperature of a brake disc reaches 100 ℃ in the running process of the vehicles, then accelerating until the speed reaches 100km/h, stepping the brakes until the vehicles stop, and recording the corresponding braking distances S ', S' of the three vehicles respectively"And S"'(ii) a For braking distance S', braking distance S"And a braking distance S"'Averaging to obtain the average braking distance S corresponding to the temperature of the brake disc of 100 DEG Cmin；
The three vehicles are also used, and in the running process of the vehicles, the brake is stepped until the temperature of the brake disc reaches TxWhen the vehicle is in use, the brake is released, the vehicle is accelerated until the vehicle speed reaches 100km/h, the brake is stepped until the vehicle stops, and the brake distances S corresponding to the three vehicles are recordedx'、Sx "And Sx "'(ii) a To the braking distance Sx', braking distance Sx "And a braking distance Sx "'Averaging to obtain the temperature T of the brake discxAverage braking distance S of time-course correspondencex(ii) a Wherein x is selected from the group consisting of all integers from 1 to n, 100 deg.C<Tx≤400℃；
Using the formula: p is a radical ofx=[1-（Sx-Smin）/Smin]100%, calculating the brake disc temperature TxTemporal braking capability pxAnd forming a corresponding relation table of the brake disc temperature and the braking capacity by combining the 100% of the braking capacity when the brake disc temperature is 100 ℃.
Preferably, the preset downhill condition means that the vehicle runs on a downhill road with a gradient greater than or equal to 8%.
Preferably, the preset first braking capability threshold is 70%, the preset second braking capability threshold is 50%, the preset third braking capability threshold is 20%, the preset time is 3 minutes, the preset fourth braking capability threshold is 40%, the preset fifth braking capability threshold is 30%, the preset sixth braking capability threshold is 20%, and the preset seventh braking capability threshold is 10%; the preset first percentage is 20%, the preset second percentage is 40%, the preset third percentage is 60%, the preset fourth percentage is 80%, and the preset fifth percentage is 100%.
The vehicle brake control system based on the braking capability comprises a brake controller and a temperature sensor which is arranged on a steering knuckle and used for collecting the temperature of a brake disc, wherein the temperature sensor is connected with the brake controller; the brake controller is programmed to execute the vehicle brake control method described above.
When the braking capacity is smaller than or equal to a preset first braking capacity threshold value, a braking capacity display request is sent to an instrument, a driver is prompted to pay attention to the following capacity through the instrument, and the vehicle distance is kept; when the braking capacity is smaller than or equal to the preset second braking capacity threshold value, a torque reduction request and an engine torque reduction percentage (namely, the engine is actively requested to be dragged backwards to reduce the vehicle speed) are sent to the engine controller, the use frequency of the brake is reduced through the dragging backwards of the engine, the temperature increase speed of the brake disc is slowed down, and therefore sufficient safe braking force is guaranteed to be provided at any time, and the safety risk is reduced.
Drawings
FIG. 1 is a schematic diagram of a braking capability based vehicle braking control system according to the present invention.
FIG. 2 is a flow chart of a braking capability based vehicle braking control method according to the present invention.
Detailed Description
The vehicle brake control system based on the braking capability shown in fig. 1 comprises a brake controller and a temperature sensor which is arranged on a steering knuckle and used for collecting the temperature of a brake disc, wherein the temperature sensor is connected with the brake controller, the brake controller acquires the temperature of the brake disc from the temperature sensor, the brake controller is communicated with an instrument and an engine controller through a CAN (controller area network) line, and the brake controller CAN acquire information such as road gradient and the like from the CAN line.
The braking capability-based vehicle braking control method shown in fig. 2 is executed by a brake controller, and comprises the following steps:
step one, acquiring the temperature of a brake disc, inquiring a temperature-braking capacity table according to the temperature of the brake disc, and determining the corresponding braking capacity.
The temperature-braking energy meter is a corresponding relation table of brake disc temperature and braking capacity obtained by a calibration mode, and the specific calibration mode is as follows:
selecting three running-in vehicles, releasing the brakes when the brake is stepped until the temperature of a brake disc reaches 100 ℃ in the running process of the vehicles, then accelerating until the speed reaches 100km/h, stepping the brakes until the vehicles stop, and recording the corresponding braking distances S ', S' of the three vehicles respectively"And S"'(ii) a For braking distance S', braking distance S"And a braking distance S"'Averaging to obtain the average braking distance S corresponding to the temperature of the brake disc of 100 DEG Cmin。
The three trolleys are also usedWhen the vehicle is running, the brake is stepped until the temperature of the brake disc reaches TxWhen the vehicle is in use, the brake is released, the vehicle is accelerated until the vehicle speed reaches 100km/h, the brake is stepped until the vehicle stops, and the brake distances S corresponding to the three vehicles are recordedx'、Sx "And Sx "'(ii) a To the braking distance Sx', braking distance Sx "And a braking distance Sx "'Averaging to obtain the temperature T of the brake discxAverage braking distance S of time-course correspondencex(ii) a Wherein x is selected from the group consisting of all integers from 1 to n, 100 deg.C<TxIs less than or equal to 400 ℃. E.g. Tx120 deg.C, 140 deg.C, 160 deg.C, 180 deg.C, 200 deg.C, 220 deg.C, 240 deg.C, 260 deg.C, 280 deg.C, 300 deg.C, 320 deg.C, 340 deg.C, 360 deg.C, 380 deg.C, 400 deg.C, etc.
Using the formula: p is a radical ofx=[1-（Sx-Smin）/Smin]100%, calculating the brake disc temperature TxTemporal braking capability pxAnd forming a corresponding relation table of the brake disc temperature and the braking capacity by combining the 100% braking capacity when the brake disc temperature is 100 ℃.
And step two, judging whether the braking capacity is less than or equal to 70%, if so, executing step three, otherwise, returning to execute step one.
And step three, sending a braking capacity display request to the instrument, and then executing step four.
And step four, judging whether the braking capacity is less than or equal to 50%, if so, executing step five, otherwise, returning to execute step one.
And step five, determining the torque reduction percentage of the engine according to the braking capacity, and then executing step six.
The percentage of torque reduction of the engine determined according to the braking capacity is specifically as follows:
if the braking capacity is less than or equal to 50% by 40%, the torque reduction percentage of the engine is 20%; if the braking capacity is less than or equal to 40% by 30%, the torque reduction percentage of the engine is 40%; if the braking capacity is less than or equal to 30 percent by 20 percent, the torque reduction percentage of the engine is 60 percent; if the braking capacity is less than or equal to 20% by 10%, the torque reduction percentage of the engine is 80%; if the braking capacity is less than or equal to 10%, the torque reduction percentage of the engine is 100%.
And step six, sending a torque reduction request and a torque reduction percentage of the engine to the engine controller, acquiring torque reduction execution information returned by the engine controller, and then executing step seven. And after receiving the torque reduction request and the torque reduction percentage of the engine, the engine controller executes the torque reduction action according to the torque reduction percentage of the engine and feeds back the torque reduction execution information to the brake controller. The engine is reversely dragged and decelerated by a torque reduction mode, the use frequency of a brake is reduced, the temperature increase speed of a brake disc is slowed down, and sufficient braking force is guaranteed to be provided at any time.
And seventhly, judging whether the braking capacity of the vehicle after the vehicle continuously runs for 3 minutes on a downhill road with the gradient larger than or equal to 8% is larger than 20% and smaller than or equal to 50%, if so, executing the step eight, and otherwise, executing the step nine.
And step eight, sending a yellow light display warning request to the instrument, and then executing step nine. After the instrument receives the yellow light display warning request, the yellow light is displayed to remind a driver of insufficient braking capacity.
And step nine, judging whether the braking capacity of the vehicle after the vehicle continuously runs for 3 minutes on a downhill road with the gradient larger than or equal to 8% is smaller than or equal to 20%, if so, executing step ten, and otherwise, ending.
And step ten, sending a red light display warning request to the instrument, and then ending. And after the instrument receives the red light display warning request, the red light is displayed to remind a driver of insufficient braking capacity.
Claims (7)
1. A vehicle braking control method based on braking capability, characterized by comprising:
acquiring the temperature of a brake disc, inquiring a temperature-braking capacity table according to the temperature of the brake disc, and determining the corresponding braking capacity;
when the braking capacity is smaller than or equal to a preset first braking capacity threshold value, a braking capacity display request is sent to an instrument;
when the braking capacity is smaller than or equal to a preset second braking capacity threshold value, determining the torque reduction percentage of the engine according to the braking capacity;
sending a torque reduction request and the torque reduction percentage of the engine to an engine controller, and acquiring torque reduction execution information returned by the engine controller;
the temperature-braking capacity meter is a corresponding relation meter of the brake disc temperature and the braking capacity obtained in a calibration mode, and the preset first braking capacity threshold is larger than the preset second braking capacity threshold.
2. The braking capability based vehicle braking control method of claim 1, wherein:
if the braking capacity of the vehicle after the vehicle continuously runs for the preset time on the downhill road condition is greater than a preset third braking capacity threshold value and less than or equal to a preset second braking capacity threshold value, sending a yellow lamp display warning request to an instrument;
and if the braking capacity of the vehicle after the vehicle continuously runs for the preset time on the preset downhill road condition is less than or equal to the preset third braking capacity threshold value, sending a red light display warning request to the instrument.
3. The braking capability based vehicle braking control method of claim 1 or 2, characterized in that:
if the braking capacity is larger than a preset fourth braking capacity threshold and smaller than or equal to a preset second braking capacity threshold, determining that the torque reduction percentage of the engine is a preset first percentage;
if the braking capacity is larger than a preset fifth braking capacity threshold and smaller than or equal to a preset fourth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset second percentage;
if the braking capacity is larger than a preset sixth braking capacity threshold and smaller than or equal to a preset fifth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset third percentage;
if the braking capacity is larger than a preset seventh braking capacity threshold and smaller than or equal to a preset sixth braking capacity threshold, determining that the torque reduction percentage of the engine is a preset fourth percentage;
if the braking capacity is smaller than or equal to a preset seventh braking capacity threshold value, determining that the torque reduction percentage of the engine is a preset fifth percentage;
the preset first percentage is smaller than the preset second percentage, the preset second percentage is smaller than the preset third percentage, the preset third percentage is smaller than the preset fourth percentage, and the preset fourth percentage is smaller than the preset fifth percentage.
4. The braking capability based vehicle braking control method of any of claims 1 to 3, characterized in that:
the corresponding relation table of the brake disc temperature and the braking capacity is obtained by calibration in the following mode:
selecting three running-in vehicles, releasing the brakes when the brake is stepped until the temperature of a brake disc reaches 100 ℃ in the running process of the vehicles, then accelerating until the speed reaches 100km/h, stepping the brakes until the vehicles stop, and recording the corresponding braking distances S ', S' of the three vehicles respectively"And S"'(ii) a For braking distance S', braking distance S"And a braking distance S"'Averaging to obtain the average braking distance S corresponding to the temperature of the brake disc of 100 DEG Cmin；
The three vehicles are also used, and in the running process of the vehicles, the brake is stepped until the temperature of the brake disc reaches TxWhen the vehicle is in use, the brake is released, the vehicle is accelerated until the vehicle speed reaches 100km/h, the brake is stepped until the vehicle stops, and the brake distances S corresponding to the three vehicles are recordedx'、Sx "And Sx "'(ii) a To the braking distance Sx', braking distance Sx "And a braking distance Sx "'Averaging to obtain the temperature T of the brake discxAverage braking distance S of time-course correspondencex(ii) a Wherein x is selected from the group consisting of all integers from 1 to n, 100 deg.C<Tx≤400℃；
Using the formula: p is a radical ofx=[1-（Sx-Smin）/Smin]100%, calculating the brake disc temperature TxOf the hourBraking capacity pxAnd forming a corresponding relation table of the brake disc temperature and the braking capacity by combining the 100% of the braking capacity when the brake disc temperature is 100 ℃.
5. The braking capability based vehicle braking control method of claim 2, wherein: the preset downhill road condition refers to a downhill road with the gradient greater than or equal to 8%.
6. The braking capability based vehicle braking control method of claim 3, wherein:
the preset first braking capacity threshold value is 70%, the preset second braking capacity threshold value is 50%, the preset third braking capacity threshold value is 20%, the preset time is 3 minutes, the preset fourth braking capacity threshold value is 40%, the preset fifth braking capacity threshold value is 30%, the preset sixth braking capacity threshold value is 20%, and the preset seventh braking capacity threshold value is 10%; the preset first percentage is 20%, the preset second percentage is 40%, the preset third percentage is 60%, the preset fourth percentage is 80%, and the preset fifth percentage is 100%.
7. A vehicle brake control system based on braking capability comprises a brake controller and a temperature sensor which is arranged on a steering knuckle and used for collecting the temperature of a brake disc, wherein the temperature sensor is connected with the brake controller; the method is characterized in that: the brake controller is programmed to execute a vehicle brake control method according to any one of claims 1 to 6.
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| CN202110742683.8A CN113460020B (en) | 2021-06-30 | 2021-06-30 | Vehicle braking control method and control system based on braking capability |
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| CN202110742683.8A CN113460020B (en) | 2021-06-30 | 2021-06-30 | Vehicle braking control method and control system based on braking capability |
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Cited By (1)
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| CN113460020B (en) | 2022-12-09 |
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