CN109624943B - Electronic parking high-temperature re-clamping method and system - Google Patents
Electronic parking high-temperature re-clamping method and system Download PDFInfo
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- CN109624943B CN109624943B CN201910035684.1A CN201910035684A CN109624943B CN 109624943 B CN109624943 B CN 109624943B CN 201910035684 A CN201910035684 A CN 201910035684A CN 109624943 B CN109624943 B CN 109624943B
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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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
Abstract
The invention provides an electronic parking high-temperature re-clamping method and system. The method comprises the steps of monitoring the temperature of a brake disc in real time according to a preset brake disc temperature rising model, detecting the variation of the temperature of the brake disc according to the preset brake disc temperature falling model when the temperature of the brake disc reaches a preset temperature value entering a high-temperature reclamping mode and a vehicle is in a parking state, executing high-temperature reclamping operation when the variation of the temperature of the brake disc reaches the preset value, and quitting the high-temperature reclamping operation until the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc drops to a preset temperature value exiting the high-temperature reclamping mode. The system comprises a temperature monitoring module, a parking state detection module, a temperature variation detection module, a parking execution module and a parking brake control module. The invention can solve the problem that the vehicle slips down the slope due to insufficient clamping force between the friction plate and the brake disc because the friction plate and the brake disc are gradually cooled after high-temperature parking.
Description
Technical Field
The invention relates to the technical field of automatic control of vehicles, in particular to an electronic parking high-temperature re-clamping method and system.
Background
At present, along with the rapid development of electronic technology, the intelligent degree of automobiles is higher and higher. An Electronic Parking Brake (EPB) system gradually replaces a conventional mechanical hand Brake function, and the electronic parking Brake system is a technology that temporary braking during driving and long-term braking after parking are integrated together, and parking braking is realized in an electronic control mode.
In the braking process of the vehicle, heat is generated due to friction between the friction plate and the brake disc, and the friction plate and the brake disc expand in heated volume. When the vehicle passes through the working condition of a large long slope, the temperatures of the friction plate and the brake disc can be increased higher, and the heated volume expansion amount of the friction plate and the brake disc can be larger.
After the vehicle is parked under the condition that the temperatures of the friction plate and the brake disc of the vehicle are too high, the friction plate and the brake disc are gradually cooled, the volumes of the friction plate and the brake disc are changed due to temperature reduction, and clamping force between the friction plate and the brake disc is insufficient, so that the vehicle slides down a slope, and the parking safety of the vehicle is affected.
In conclusion, the electronic parking high-temperature reclamping method and system are developed, and the problem that after a vehicle is parked under the condition that the temperatures of a friction plate and a brake disc are too high, the clamping force between the friction plate and the brake disc is insufficient due to gradual cooling of the friction plate and the brake disc, and therefore the vehicle slips down a slope is solved.
Disclosure of Invention
The invention aims to solve the technical problems and provides an electronic parking high-temperature re-clamping method and system, which are realized by the following technical scheme:
a first aspect of the present invention provides an electronic parking high-temperature re-clamping method, including:
monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature re-clamping mode，Detecting a parking state of the vehicle;
when the vehicle is in a parking state, detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model;
when the temperature variation of the brake disc reaches a preset value, controlling the brake disc to perform high-temperature reclamping operation on the brake friction plate;
and repeating the step of controlling the brake disc to perform high-temperature reclamping operation on the brake friction plate when the variation of the temperature of the brake disc reaches a preset value, and controlling the brake disc to exit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for exiting the high-temperature reclamping mode.
Further, according to the brake disc temperature of predetermineeing the rising model real time monitoring brake disc temperature, include: the method comprises the steps of collecting the current environment temperature of a vehicle in real time, obtaining a brake disc temperature rising model corresponding to the environment temperature according to the environment temperature, and monitoring the brake disc temperature in real time according to the brake disc temperature rising model corresponding to the environment temperature.
Further, the detecting a parking state of the vehicle includes: the method comprises the steps of collecting the current wheel rotating speed of a vehicle, the current ignition switch state of the vehicle and the clamping state of a brake disc in real time, and judging that the vehicle is in a parking state when the wheel rotating speed is smaller than a preset threshold value, the ignition switch is in an on state and the brake disc is in the clamping state.
Further, when the vehicle is in a parking state, detecting the variation of the brake disc temperature according to a preset brake disc temperature drop model, including: when the vehicle is in a parking state, a brake disc temperature drop model corresponding to the environment temperature is obtained, and whether the variation of the brake disc temperature reaches a preset value or not is detected according to the brake disc temperature drop model corresponding to the environment temperature.
Further, when the variation of the brake disc temperature reaches a preset value, the step of controlling the brake disc to perform a high-temperature reclamping operation on the brake pads further includes: and when the variation of the temperature of the brake disc reaches a preset value, delaying preset time, and controlling the brake disc to perform high-temperature reclamping operation on the brake friction disc after the preset time.
A second aspect of the present invention provides an electronic parking high temperature re-clamping system, the system comprising:
the temperature monitoring module is used for monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
the parking state detection module is used for detecting the parking state of the vehicle when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature rejoining mode;
the temperature variation detection module is used for detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model when the vehicle is in a parking state;
the parking execution module is used for controlling the brake disc to execute high-temperature reclamping operation on the brake friction plate when the temperature variation of the brake disc reaches a preset value; and is used for controlling the brake disc to exit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for exiting the high-temperature reclamping mode;
and the parking brake control module is used for driving the parking execution module to control the brake disc so that the brake disc executes the high-temperature re-clamping operation or quits the high-temperature re-clamping operation.
Further, the temperature monitoring module comprises a temperature acquisition module, a temperature rise model acquisition module and a temperature calculation module,
the temperature acquisition module is used for acquiring the current environment temperature of the vehicle in real time;
the temperature rise model acquisition module is used for acquiring a brake disc temperature rise model corresponding to the ambient temperature according to the ambient temperature;
and the temperature calculation module is used for calculating the temperature of the brake disc in real time according to the brake disc temperature rising model corresponding to the environment temperature.
Further, the parking state detection module comprises a wheel rotating speed acquisition module, an ignition switch state acquisition module, a parking execution module state acquisition module and a parking state judgment module,
the wheel rotating speed acquisition module is used for acquiring the current wheel rotating speed of the vehicle in real time;
the ignition switch state acquisition module is used for acquiring the ignition switch state of the vehicle in real time;
the parking execution module state acquisition module is used for acquiring the clamping state of the parking execution module in real time;
and the parking state judging module is used for judging that the vehicle is in a parking state when the wheel rotating speed is less than a preset threshold value, the ignition switch is in an on state and the parking executing module is in a clamping state.
Further, the temperature variation detecting module comprises a temperature drop model obtaining module and a temperature variation calculating module,
the temperature drop model acquisition module is used for acquiring a brake disc temperature drop model corresponding to the environment temperature when the vehicle is in a parking state;
and the temperature variation calculating module is used for calculating whether the variation of the temperature of the brake disc reaches a preset value or not according to the brake disc temperature reduction model corresponding to the environment temperature.
Further, the parking actuating mechanism comprises a reclamping function actuating module and a reclamping function quitting module,
the re-clamping function execution module is used for controlling the brake disc to execute high-temperature re-clamping operation on the brake friction plate immediately or after preset time when the variable quantity of the temperature of the brake disc reaches a preset value;
and the rejicking function quitting module is used for controlling the brake disc to quit the high-temperature rejicking operation when the rejicking operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for quitting the high-temperature rejicking mode.
The implementation of the invention has the following beneficial effects:
(1) this application real time monitoring brake disc temperature, when the brake disc temperature reaches the temperature value of the clamp mode again of predetermined entering high temperature, electron parking system gets into high temperature and presss from both sides function standby state again, press from both sides function standby state again at high temperature, if it is in the parking state (the vehicle is static promptly, the vehicle parking state is pulled up) to detect the vehicle, then according to predetermined brake disc temperature decline model, detect the change amount of brake disc temperature, as long as the change amount of brake disc temperature reaches the default, just control the brake disc and carry out a high temperature operation of pressing from both sides again to the brake disc, when lasting predetermined time or brake disc temperature drop to the temperature value of the clamp mode of predetermined withdrawal high temperature again, withdraw from high temperature and press from both sides the operation again. After the high temperature parking can be solved well in this application, because friction disc, brake disc cool off gradually, the clamp force that leads to between friction disc and brake disc is not enough to the problem of the vehicle swift current slope that arouses.
(2) This application is according to predetermined temperature rising model control driving disk temperature to according to the change amount of predetermined braking disk temperature decline model detection braking disk temperature, and carry out a lot of again according to the change amount that the temperature drops and press from both sides, thereby make the high temperature of this application press from both sides the operation more accurate again.
(3) The high-temperature electronic braking parking device is high in generalization degree, and adaptive parameter adjustment can be performed on all vehicle types, so that the high-temperature electronic braking parking device can be suitable for different vehicle types, other electronic braking parking vehicle types can be directly designed according to the strategy, and the phenomenon of high-temperature parking sliding is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a first flowchart of an exemplary method for electronic parking high temperature rebinding according to the present invention;
FIG. 2 is a schematic diagram of an exemplary embodiment of an electronic parking high temperature rebinding method;
FIG. 3 is a second flowchart of the electronic parking high temperature rebinding method according to the embodiment of the present invention;
FIG. 4 is a first block diagram of an exemplary method for electronic parking high temperature rebinding in accordance with the present invention;
FIG. 5 is a second block diagram of the electronic parking high temperature rebinding method according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment discloses an electronic parking high-temperature re-clamping method, which includes:
s110, monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
specifically, the steps include: the method comprises the steps of collecting the current environment temperature of a vehicle in real time, obtaining a brake disc temperature rising model corresponding to the environment temperature according to the environment temperature, and monitoring the brake disc temperature in real time according to the brake disc temperature rising model corresponding to the environment temperature.
Since the temperature change of the brake disk of the vehicle is different in different environmental temperatures, for example, the temperature change of the brake disk may be greatly different in winter and summer, in the embodiment, a plurality of brake disk temperature increase models corresponding to the environmental temperatures are stored in advance. The brake disc temperature rise model pre-stored in the embodiment is formed by a self-defined method, and the specific forming process is approximately as follows: the method comprises the steps of carrying out multiple braking operations on a vehicle at different environmental temperatures, wherein the temperature of each time point from the beginning to the end of braking is different in each braking, collecting the temperature of a brake disc at each time point in each braking process, and inputting the temperature of the brake disc at each time point into a temperature calculation model to form a test temperature rising curve (because the braking process generates heat due to friction between the brake disc and a friction plate, and the temperature of the brake disc is in a rising trend in the braking process, the formed curve also needs to be a rising curve). And carrying out denoising, fitting and other treatment on the multiple brake disc temperature test rising curves formed by multiple braking operations, and finally forming multiple test temperature rising curves corresponding to different environmental temperatures.
The test temperature rise curve is obtained through experiments, and the test result is not very accurate due to the fact that the experiment process is possibly influenced by other factors, so that the test temperature rise curve obtained through the test needs to be corrected.
Because the material, structure, and heat dissipation condition of each brake disc are different, the present embodiment may modify the test temperature rise curve obtained by the experimental test process according to the physical and/or chemical property (such as material, structure, and heat dissipation condition) of the brake disc, specifically, the present embodiment may obtain the theoretical temperature rise curve of the brake disc at different environmental temperatures according to the physical and/or chemical property of the brake disc, modify the test temperature rise curve by the theoretical temperature rise curve to obtain a modified temperature rise curve, which is the brake disc temperature rise model in the present embodiment, wherein the different environmental temperatures may be divided according to seasons, such as spring, summer, autumn, and winter, and may also be divided according to specific temperature values, such as 1-10 deg.C, 10-20 deg.C, 20-30 deg.C, etc.
In the embodiment, the current environment temperature of the vehicle is acquired in real time through a temperature sensor, when the current environment temperature is judged to be in summer, a brake disc temperature rising model corresponding to summer is acquired from a preset brake disc temperature rising model, and the brake disc temperature is monitored in real time according to the brake disc temperature rising model corresponding to summer; and when the current environment temperature is judged to be winter, acquiring a brake disc temperature rising model corresponding to winter from the preset brake disc temperature rising model, and monitoring the brake disc temperature in real time according to the brake disc temperature rising model corresponding to winter.
S120, detecting the parking state of the vehicle when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature re-clamping mode;
in this embodiment, a preset temperature value entering the high temperature rejicking mode is stored, for example, the preset temperature value may be a preset minimum temperature value entering the high temperature rejicking mode, when it is detected through a brake disc temperature rising model corresponding to an ambient temperature that the brake disc temperature reaches the preset minimum temperature value entering the high temperature rejicking mode, the high temperature rejicking mode is entered into a standby state, and at this time, it is detected whether the vehicle is in a parking state;
the specific method for detecting whether the vehicle is in the parking state in the embodiment is as follows:
the method comprises the steps of collecting the current wheel rotating speed, the ignition switch state and the clamping state of a brake disc of a vehicle in real time, and judging that the vehicle is in a parking state when the wheel rotating speed is smaller than a preset threshold value (when the wheel rotating speed is smaller than the preset threshold value, the vehicle can be judged to be in a static state), the ignition switch is in an on state and the brake disc is in the clamping state.
S130, when the vehicle is in a parking state, detecting the variation of the brake disc temperature according to a preset brake disc temperature reduction model;
specifically, the steps include: when a vehicle is in a parking state, acquiring a brake disc temperature drop model corresponding to the environment temperature, and detecting whether the variation of the brake disc temperature reaches a preset value according to the brake disc temperature drop model corresponding to the environment temperature;
since the temperature change of the brake disk of the vehicle is different in different environmental temperatures, for example, the temperature change of the brake disk may be greatly different in winter and summer, in the embodiment, a plurality of brake disk temperature decrease models corresponding to the environmental temperatures are stored in advance. The brake disc temperature drop model prestored in the embodiment is also formed by a custom method, and the specific forming process is approximately as follows: the method comprises the steps of carrying out multiple braking operations on a vehicle at different environmental temperatures, collecting the temperature reduction change condition of a brake disc at each time point after parking is completed each time, and inputting the temperature of the brake disc at each time point into a temperature calculation model to form a test temperature reduction curve (after parking, the brake disc and a friction plate are gradually cooled, and the temperature of the brake disc is in a reduction trend, so that the formed curve also needs to be a reduction curve). And carrying out denoising, fitting and other treatment on the multiple brake disc temperature test descending curves formed by multiple times of braking, and finally forming multiple test temperature descending curves corresponding to different environmental temperatures.
The test temperature drop curve is obtained through experiments, and the test result is not very accurate because the experiment process is possibly influenced by other factors, so that the test temperature drop curve obtained through the test needs to be corrected.
Because the material, structure, and heat dissipation condition of each brake disc are different, the test temperature drop curve obtained in the experimental test process can be corrected according to the physical and/or chemical properties (such as material, structure, and heat dissipation condition) of the brake disc in this embodiment, specifically, the theoretical temperature drop curve of the brake disc at different environmental temperatures can be obtained according to the physical and/or chemical properties of the brake disc, the test temperature drop curve is corrected by the theoretical temperature drop curve to obtain a corrected temperature drop curve, which is the brake disc temperature drop model in this embodiment, wherein the different environmental temperatures can be divided according to seasons, such as spring, summer, autumn, and winter, and can also be divided according to specific temperature values, such as 1-10 deg.C, 10-20 deg.C, 20-30 deg.C, etc.
In the embodiment, when a vehicle is in a parking state and the current environment temperature is summer, a brake disc temperature drop model corresponding to summer is obtained from a preset brake disc temperature drop model, and whether the variation of the brake disc temperature reaches a preset value is detected according to the brake disc temperature drop model corresponding to summer; when a vehicle is in a parking state and the current environment temperature is winter, a brake disc temperature reduction model corresponding to the winter is obtained from a preset brake disc temperature reduction model, and whether the variation of the brake disc temperature reaches a preset value is detected according to the brake disc temperature reduction model corresponding to the winter.
S140, when the temperature variation of the brake disc reaches a preset value, controlling the brake disc to perform high-temperature reclamping operation on the brake friction plate;
s150, repeating the step of controlling the brake disc to execute high-temperature reclamping operation on the brake friction plate when the variation of the temperature of the brake disc reaches a preset value, and controlling the brake disc to exit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for exiting the high-temperature reclamping mode.
The clamping force for the high-temperature reclamping operation in this embodiment may not be determined according to the current environment of the vehicle, for example, the clamping force may be determined according to the gradient, specifically, a ramp of 0-5% may be used as a flat road by default, a smaller clamping force may be used, a ramp of 5-15% may be used as a medium ramp by default, a larger clamping force may be used, a large gradient of 15-30% may be used as a large clamping force by default, and a maximum clamping force may be used. In addition to the environment in which the vehicle is currently located, vehicle parameters of the vehicle, such as weight, etc., are also contributing factors in determining the clamping force of the high temperature re-clamp.
Specifically, in this embodiment, instead of ending the re-clamping once when the variation of the brake disc temperature reaches the preset value, the re-clamping is performed once when the variation of the brake disc temperature reaches the preset value, that is, the re-clamping is performed for multiple times until the duration of the high-temperature re-clamping operation reaches the preset time or the brake disc temperature drops to a temperature value exiting the preset high-temperature re-clamping mode, and the high-temperature re-clamping operation is not stopped.
Next, how the electronic parking high-temperature re-chucking method in the present embodiment is implemented is exemplified:
as shown in fig. 2, which is a working schematic diagram of the present embodiment, the parameters in the present embodiment are defined as follows: defining a preset minimum temperature value (on temp) for entering a high-temperature re-clamping mode to be 350 ℃, a preset maximum temperature value (off temp) for exiting the high-temperature re-clamping mode to be 250 ℃, a maximum time (max _ wake _ up _ time) for the high-temperature re-clamping operation to last to be 1h, and controlling the brake disc to perform one high-temperature re-clamping operation on the brake friction plate when the variation (drop temp) of the temperature of the brake disc is 80 ℃, wherein the condition for entering the high-temperature re-clamping mode is as follows: the vehicle is in a power-on state, the temperature of the brake disc reaches a preset minimum temperature value (on temp) for entering a high-temperature rejoining mode, and the exit condition of the high-temperature rejoining mode is defined as follows: when the temperature of the brake disc reaches a preset maximum temperature value (off temp) for exiting the high-temperature re-clamping mode or the duration time of the state machine reaches the maximum time (max _ wake _ up _ time) for the duration of the high-temperature re-clamping operation when entering the high-temperature re-clamping mode, defining the high-temperature re-clamping condition as follows: the vehicle is in a stationary state, the parking device state is in an applied state (namely, the parking execution module is in a clamping state), and the drop temp reaches a set value.
Firstly, acquiring the current external environment temperature through an external temperature collector, acquiring a brake disc temperature rising model corresponding to the environment temperature, monitoring the brake disc temperature in real time according to the brake disc temperature rising model corresponding to the environment temperature, entering a high-temperature re-clamping standby state when the brake disc temperature reaches 350 ℃ (on temp), detecting whether the vehicle is in a parking state (assuming that the parking brake disc temperature is 600 ℃) or not, acquiring a preset brake disc temperature falling model corresponding to the environment temperature to detect whether the brake disc temperature variation (drop temp) is 80 ℃ (the brake disc temperature is 520 ℃) or not when the vehicle is in the parking state (namely the vehicle is in a static state and a parking execution module is in a clamping state), controlling the brake disc to execute the first high-temperature re-clamping operation on a brake pad if the brake disc temperature is 80 ℃ (the brake disc temperature is 440 ℃), and (3) manufacturing the brake disc to perform a second high-temperature reclamping operation on the brake friction plate, when the temperature of the brake disc is reduced by 80 ℃ (the temperature of the brake disc is 360 ℃), manufacturing the brake disc to perform a third high-temperature reclamping operation on the brake friction plate, and so on, and stopping the high-temperature reclamping operation until the duration of the high-temperature reclamping operation reaches 1h, namely max _ wake _ up _ time, or the temperature of the brake disc is reduced to 250 ℃ (namely off temp).
Example 2
As shown in fig. 3, the present embodiment discloses another electronic parking high-temperature reclamping method, which includes:
s210, monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
s220, detecting the parking state of the vehicle when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature re-clamping mode;
s230, when the vehicle is in a parking state, detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model;
please refer to S110-S130 for the detailed process of steps S210-S230, which is not described herein.
S240, delaying preset time when the variable quantity of the temperature of the brake disc reaches a preset value, and controlling the brake disc to perform high-temperature reclamping operation on the brake friction disc after the preset time;
in this embodiment, when the variation of the temperature of the brake disc reaches the preset value, the high-temperature reclamping operation may not be performed immediately, but the preset time may be delayed first, for example, 10 seconds may be delayed first, and then the brake disc is controlled to perform the high-temperature reclamping operation on the brake pad after 10 seconds. The reason why the high-temperature re-clamping operation is performed after the preset time is set in this embodiment is that: in practical applications, there are cases where the vehicle is started immediately after the vehicle is parked, and in such cases, there is a possibility that the vehicle needs to be restarted if the temperature variation of the brake disc has not reached the preset value.
And S250, repeating the steps of delaying preset time when the variation of the temperature of the brake disc reaches a preset value, controlling the brake disc to perform high-temperature reclamping operation on the brake friction disc after the preset time, and controlling the brake disc to exit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for exiting the high-temperature reclamping mode.
Specifically, in this embodiment, instead of immediately performing re-clamping once when the variation of the brake disc temperature reaches the preset value, the re-clamping is performed once every time the variation of the brake disc temperature reaches the preset value and the preset time is delayed, that is, after the variation of the temperature reaches the preset value and the preset time is delayed, the re-clamping is performed for a plurality of times until the duration of the high-temperature re-clamping operation reaches the preset time or the brake disc temperature drops to the preset temperature value for exiting the high-temperature re-clamping mode, and the high-temperature re-clamping operation is stopped.
Example 3
As shown in fig. 4 and 5, the present embodiment discloses an electronic parking high-temperature rebinding system, which includes:
the temperature monitoring module is used for monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
specifically, the temperature monitoring module comprises a temperature acquisition module, a temperature rise model acquisition module and a temperature calculation module;
the temperature acquisition module is used for acquiring the current environment temperature of the vehicle in real time;
the temperature rise model acquisition module is used for acquiring a brake disc temperature rise model corresponding to the ambient temperature according to the ambient temperature;
and the temperature calculation module is used for calculating the temperature of the brake disc in real time according to the brake disc temperature rising model corresponding to the environment temperature.
The parking state detection module is used for detecting the parking state of the vehicle when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature rejoining mode;
specifically, the parking state detection module comprises a wheel rotating speed acquisition module, an ignition switch state acquisition module, a parking execution module state acquisition module and a parking state judgment module,
the wheel rotating speed acquisition module is used for acquiring the current wheel rotating speed of the vehicle in real time;
the ignition switch state acquisition module is used for acquiring the ignition switch state of the vehicle in real time;
the parking execution module state acquisition module is used for acquiring the clamping state of the parking execution module in real time;
and the parking state judging module is used for judging that the vehicle is in a parking state when the wheel rotating speed is less than a preset threshold value, the ignition switch is in an on state and the parking executing module is in a clamping state.
The temperature variation detection module is used for detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model when the vehicle is in a parking state;
specifically, the temperature variation detection module comprises a temperature drop model selection module and a temperature variation calculation module,
the temperature drop model acquisition module is used for acquiring a brake disc temperature drop model corresponding to the environment temperature when the vehicle is in a parking state;
and the temperature variation calculating module is used for calculating whether the variation of the temperature of the brake disc reaches a preset value or not according to the brake disc temperature reduction model corresponding to the environment temperature.
The parking execution module comprises a re-clamping function execution module and a re-clamping function exit module, wherein the re-clamping function execution module is used for controlling the brake disc to execute high-temperature re-clamping operation on the brake friction plate immediately or after preset time when the variation of the temperature of the brake disc reaches a preset value; the re-clamping function quitting module is used for controlling the brake disc to quit the high-temperature re-clamping operation when the high-temperature re-clamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for quitting the high-temperature re-clamping mode;
and the parking brake control module is used for driving the parking execution module to control the brake disc so that the brake disc executes the high-temperature re-clamping operation or quits the high-temperature re-clamping operation.
The preset temperature value entering the high temperature rejicking mode in this embodiment may be, for example, a preset minimum temperature value entering the high temperature rejicking mode, and the preset temperature value exiting the high temperature rejicking mode may be, for example, a preset maximum temperature value exiting the high temperature rejicking mode.
It should be noted that the modules in this embodiment correspond to the method in embodiment 1 one to one.
The embodiment of the invention has the following beneficial effects:
(1) this application real time monitoring brake disc temperature, when the brake disc temperature reaches the temperature value of the clamp mode again of predetermined entering high temperature, electron parking system gets into high temperature and presss from both sides function standby state again, press from both sides function standby state again at high temperature, if it is in the parking state (the vehicle is static promptly, the vehicle parking state is pulled up) to detect the vehicle, then according to predetermined brake disc temperature decline model, detect the change amount of brake disc temperature, as long as the change amount of brake disc temperature reaches the default, just control the brake disc and carry out a high temperature operation of pressing from both sides again to the brake disc, when lasting predetermined time or brake disc temperature drop to the temperature value of the clamp mode of predetermined withdrawal high temperature again, withdraw from high temperature and press from both sides the operation again. After the high temperature parking can be solved well in this application, because friction disc, brake disc cool off gradually, the clamp force that leads to between friction disc and brake disc is not enough to the problem of the vehicle swift current slope that arouses.
(2) This application is according to predetermined temperature rising model control driving disk temperature to according to the change amount of predetermined braking disk temperature decline model detection braking disk temperature, and carry out a lot of again according to the change amount that the temperature drops and press from both sides, thereby make the high temperature of this application press from both sides the operation more accurate again.
(3) The high-temperature electronic braking parking device is high in generalization degree, and adaptive parameter adjustment can be performed on all vehicle types, so that the high-temperature electronic braking parking device can be suitable for different vehicle types, other electronic braking parking vehicle types can be directly designed according to the strategy, and the phenomenon of high-temperature parking sliding is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An electronic parking high-temperature reclamping method is characterized by comprising the following steps:
monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature re-clamping mode, detecting the parking state of the vehicle;
when the vehicle is in a parking state, detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model;
when the temperature variation of the brake disc reaches a preset value, controlling the brake disc to perform high-temperature reclamping operation on the brake friction plate;
repeatedly controlling the brake disc to perform high-temperature reclamping operation on the brake friction plate when the variation of the temperature of the brake disc reaches a preset value, and controlling the brake disc to quit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for quitting the high-temperature reclamping mode;
the preset brake disc temperature rise model is obtained in the following process:
under different environmental temperatures, the vehicle is subjected to multiple braking operations;
collecting the temperature of a brake disc at each time point in each braking operation process at different environmental temperatures;
based on the temperature calculation model, carrying out temperature test processing on the temperature of the brake disc at each time point in each braking operation process to obtain a test temperature rising curve corresponding to each braking operation at different environmental temperatures;
fitting a test temperature rising curve corresponding to each braking operation at different environmental temperatures to obtain candidate test temperature rising curves corresponding to different environmental temperatures;
correcting the candidate test temperature rising curve based on a theoretical temperature rising curve to obtain target test temperature rising curves corresponding to different environmental temperatures; the theoretical temperature rise curve is determined based on physical and/or chemical properties of the brake disc;
and taking target test temperature rising curves corresponding to different environmental temperatures as the preset brake disc temperature rising model.
2. The electronic parking high-temperature reclamping method according to claim 1, wherein the real-time monitoring of the brake disc temperature according to a preset brake disc temperature rise model comprises:
the method comprises the steps of collecting the current environment temperature of a vehicle in real time, obtaining a brake disc temperature rising model corresponding to the environment temperature according to the environment temperature, and monitoring the brake disc temperature in real time according to the brake disc temperature rising model corresponding to the environment temperature.
3. The electronic parking high temperature reclamping method of claim 1, wherein the detecting a parked state of the vehicle comprises:
the method comprises the steps of collecting the current wheel rotating speed of a vehicle, the current ignition switch state of the vehicle and the clamping state of a brake disc in real time, and judging that the vehicle is in a parking state when the wheel rotating speed is smaller than a preset threshold value, the ignition switch is in an on state and the brake disc is in the clamping state.
4. The electronic parking high-temperature reclamping method according to claim 2, wherein the detecting the variation of the brake disc temperature according to a preset brake disc temperature drop model when the vehicle is in the parking state comprises:
when the vehicle is in a parking state, a brake disc temperature drop model corresponding to the environment temperature is obtained, and whether the variation of the brake disc temperature reaches a preset value or not is detected according to the brake disc temperature drop model corresponding to the environment temperature.
5. The electronic parking high-temperature reclamping method according to claim 1, wherein the step of controlling the brake disc to perform a high-temperature reclamping operation on a brake pad when the variation amount of the brake disc temperature reaches a preset value further comprises: and when the variation of the temperature of the brake disc reaches a preset value, delaying preset time, and controlling the brake disc to perform high-temperature reclamping operation on the brake friction disc after the preset time.
6. An electronic parking high temperature re-clamping system, comprising:
the temperature monitoring module is used for monitoring the temperature of the brake disc in real time according to a preset brake disc temperature rising model;
the parking state detection module is used for detecting the parking state of the vehicle when the temperature of the brake disc reaches a preset temperature value for entering a high-temperature rejoining mode;
the temperature variation detection module is used for detecting the variation of the temperature of the brake disc according to a preset brake disc temperature reduction model when the vehicle is in a parking state;
the parking execution module is used for controlling the brake disc to execute high-temperature reclamping operation on the brake friction plate when the temperature variation of the brake disc reaches a preset value; and is used for controlling the brake disc to exit the high-temperature reclamping operation when the high-temperature reclamping operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for exiting the high-temperature reclamping mode;
the parking brake control module is used for driving the parking execution module to control the brake disc so that the brake disc executes the high-temperature re-clamping operation or quits the high-temperature re-clamping operation;
wherein, the system still includes preset brake disc temperature rise model acquisition module, preset brake disc temperature rise model acquisition module includes:
the brake operation module is used for performing multiple brake operations on the vehicle at different environmental temperatures;
the brake disc temperature acquisition module is used for acquiring the brake disc temperature of each time point in each brake operation process at different environmental temperatures;
the test temperature rise curve acquisition module is used for carrying out temperature test processing on the temperature of the brake disc at each time point in each brake operation process based on the temperature calculation model to obtain a test temperature rise curve corresponding to each brake operation at different environmental temperatures;
the candidate test temperature rising curve obtaining module is used for fitting a test temperature rising curve corresponding to each braking operation at different environmental temperatures to obtain candidate test temperature rising curves corresponding to different environmental temperatures;
the target test temperature rising curve acquisition module is used for correcting the candidate test temperature rising curve based on a theoretical temperature rising curve to obtain target test temperature rising curves corresponding to different environmental temperatures; the theoretical temperature rise curve is determined based on physical and/or chemical properties of the brake disc;
and the preset brake disc temperature rise model determining module is used for taking target test temperature rise curves corresponding to different environmental temperatures as the preset brake disc temperature rise model.
7. The electronic parking high-temperature re-clamping system according to claim 6, wherein the temperature monitoring module comprises a temperature acquisition module, a temperature rise model acquisition module and a temperature calculation module,
the temperature acquisition module is used for acquiring the current environment temperature of the vehicle in real time;
the temperature rise model acquisition module is used for acquiring a brake disc temperature rise model corresponding to the ambient temperature according to the ambient temperature;
and the temperature calculation module is used for calculating the temperature of the brake disc in real time according to the brake disc temperature rising model corresponding to the environment temperature.
8. The electronic parking high-temperature reclamping system of claim 6, wherein the parking state detection module comprises a wheel rotation speed acquisition module, an ignition switch state acquisition module, a parking execution module state acquisition module and a parking state judgment module,
the wheel rotating speed acquisition module is used for acquiring the current wheel rotating speed of the vehicle in real time;
the ignition switch state acquisition module is used for acquiring the ignition switch state of the vehicle in real time;
the parking execution module state acquisition module is used for acquiring the clamping state of the parking execution module in real time;
and the parking state judging module is used for judging that the vehicle is in a parking state when the wheel rotating speed is less than a preset threshold value, the ignition switch is in an on state and the parking executing module is in a clamping state.
9. The electronic parking high-temperature rebinding system according to claim 7, wherein the temperature variation detecting module includes a temperature drop model obtaining module and a temperature variation calculating module,
the temperature drop model acquisition module is used for acquiring a brake disc temperature drop model corresponding to the environment temperature when the vehicle is in a parking state;
and the temperature variation calculating module is used for calculating whether the variation of the temperature of the brake disc reaches a preset value or not according to the brake disc temperature reduction model corresponding to the environment temperature.
10. The electronic parking high-temperature rebinding system according to claim 6, wherein the parking execution module comprises a rebinding function execution module and a rebinding function exit module,
the re-clamping function execution module is used for controlling the brake disc to execute high-temperature re-clamping operation on the brake friction plate immediately or after preset time when the variable quantity of the temperature of the brake disc reaches a preset value;
and the rejicking function quitting module is used for controlling the brake disc to quit the high-temperature rejicking operation when the rejicking operation lasts for a preset time or the temperature of the brake disc is reduced to a preset temperature value for quitting the high-temperature rejicking mode.
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| CN110775038B (en) * | 2019-09-18 | 2021-04-06 | 浙江零跑科技有限公司 | Integrated electronic parking system for new energy vehicle and control method thereof |
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| CN113460019B (en) * | 2020-03-31 | 2022-12-09 | 比亚迪股份有限公司 | Method for monitoring temperature of brake disc in real time, storage medium and vehicle |
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| CN114148308A (en) * | 2021-12-28 | 2022-03-08 | 江西五十铃汽车有限公司 | High-temperature re-clamping method for electronic parking system |
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