CN116215486A - Brake switch state judging method and system - Google Patents
Brake switch state judging method and system Download PDFInfo
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- CN116215486A CN116215486A CN202111479480.0A CN202111479480A CN116215486A CN 116215486 A CN116215486 A CN 116215486A CN 202111479480 A CN202111479480 A CN 202111479480A CN 116215486 A CN116215486 A CN 116215486A
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- brake switch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention relates to the technical field of vehicle braking, in particular to a method and a system for judging a brake switch state. The brake switch state judging method comprises the following steps of judging whether a brake switch signal is credible or not; when the brake switch signal is not credible, judging whether a fault prompt signal of a fault of the brake switch is received or not; when a fault prompt signal is received, a first signal is received, and whether the first signal is smaller than a first threshold value is judged; when the first signal is smaller than a first threshold value, judging that the brake switch does not act; and when the first signal is larger than or equal to a first threshold value, judging that the brake switch operates. When the brake switch signal is not credible, by increasing the judgment of whether the brake switch has a fault and the first signal, the situation that when the brake switch acts but the brake switch signal is not credible, for example, the brake pedal is stepped on and the brake lamp cannot be lightened, and the front car cannot judge the driving behavior of the front car in time due to the fact that the front car brakes but the brake lamp is not lightened, so that traffic accidents are caused is avoided.
Description
Technical Field
The invention relates to the technical field of vehicle braking, in particular to a method and a system for judging a brake switch state.
Background
Vehicles are mainly used for carrying personnel and/or goods, etc., and are widely used with the rapid development of economy. In driving a vehicle, a driver can brake as required, the driver steps on a brake pedal, a brake switch sends a brake switch signal to a vehicle body controller, and a brake lamp is lighted. When the vehicle brake switch fails, the vehicle body controller cannot receive the brake switch signal and can not light the brake lamp, and when the front vehicle brakes and the rear vehicle cannot judge the driving behavior of the front vehicle through the brake lamp, traffic accidents are very easy to occur.
Disclosure of Invention
Therefore, the invention provides a brake switch state judging method, which solves or partially solves the problems that in the prior art, a brake lamp cannot be lightened due to the failure of a vehicle brake switch, and traffic accidents are very easy to occur.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for judging the state of brake switch includes such steps as,
judging whether the brake switch signal is credible or not;
when the brake switch signal is not credible, judging whether a fault prompt signal of a fault of the brake switch is received or not;
when a fault prompt signal is received, a first signal is received, and whether the first signal is smaller than a first threshold value is judged;
when the first signal is smaller than a first threshold value, judging that the brake switch does not act;
and when the first signal is larger than or equal to a first threshold value, judging that the brake switch operates.
Optionally, after the step of determining whether the brake switch signal is authentic, the method further comprises the step of,
and when the brake switch signal is reliable, judging the brake switch to act.
Optionally, the step further comprises the step of, when the brake switch signal is not trusted, judging whether a fault prompt signal indicating that the brake switch has a fault is received,
and when the fault prompt signal is not received, judging that the brake switch is not operated.
Optionally, determining whether the brake switch has a fault includes the steps of,
judging whether the brake switch signal is credible or not;
when the brake switch signal is not trusted, judging whether the second signal is larger than a second threshold value or not;
when the second signal is larger than a second threshold value, judging that the brake switch has a fault, and transmitting a fault prompt signal of the fault;
and when the second signal is smaller than or equal to a second threshold value, judging that the brake switch has no fault and transmitting no fault prompt signal with fault.
Optionally, after the step of determining whether the brake switch signal is authentic, the method further comprises the step of,
when the brake switch signal is credible, judging that the brake switch has no fault, and not transmitting a fault prompt signal with fault.
Optionally, the step, after judging that the brake switch has a fault and transmitting a fault prompting signal that the fault exists when the second signal is larger than the second threshold value, further comprises the following steps,
and transmitting a fault prompt signal of the fault to the warning piece.
Optionally, the brake switch state judging method includes,
the first piece is used for receiving a fault prompt signal and a first signal of the fault of the brake switch and judging the state of the brake switch;
and the second piece is used for judging whether the brake switch has a fault or not and transmitting a fault prompt signal and a first signal of the fault.
Optionally, the first piece is a vehicle body controller, and the second piece is a stability control system;
when the stability control system determines whether the brake switch has a fault, the valve and the motor in the stability control system are not operated.
Optionally, the first signal and the second signal are both master cylinder pressure values.
In the brake switch state judging method, whether the brake switch signal of the brake switch is credible or not is judged, and when the brake switch signal is not credible, whether a fault prompt signal of a fault of the brake switch is received or not is judged; when the fault prompt signal is received, the brake switch fails, at the moment, a first signal is received, and whether the first signal is smaller than a first threshold value or not is judged to judge the state of the brake switch. That is, when the brake switch signal is not reliable, the judgment of whether the brake switch has a fault or not and the judgment of the first signal are added, so as to avoid the occurrence of traffic accidents caused by that the front vehicle cannot judge the front vehicle driving behavior in time due to the fact that the brake pedal is stepped on and the brake lamp cannot be lightened when the brake switch acts but the brake switch signal is not reliable. Therefore, the brake switch state judging method has the advantage of being safer.
Another object of the present invention is to provide a brake switch status determining system, so as to solve or partially solve the problem that the brake lamp cannot be turned on due to the failure of the existing vehicle brake switch, and traffic accidents are very easy to occur.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a brake switch state judging system includes,
a brake lamp for warning a braking state to prevent a rear-end collision accident;
a brake switch for outputting a brake switch signal;
the stability control system is connected with the brake switch and is used for judging whether the brake switch has faults or not;
and the vehicle body controller is connected with the brake lamp, the brake switch and the stable control system, and is used for judging the state of the brake switch according to the fault prompt signal and the first signal transmitted by the stable control system and controlling the brake lamp to be lightened according to the state of the brake switch.
The brake switch state judging system has the same advantages as those of the brake switch state judging method in the prior art, and is not described in detail herein.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first flow chart of a brake switch status determination method according to the present invention;
FIG. 2 is a schematic diagram of a second flow chart of a brake switch status determination method according to the present invention;
FIG. 3 is a schematic diagram illustrating connection of a brake switch status determination system according to the present invention;
reference numerals illustrate:
1-a brake light; 2-a brake switch; 3-a stable control system; 4-a body controller; 5-brake pedal.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The brake switch state judgment method of the embodiment of the present application may be executed by a controller of a vehicle including a brake lamp 1, a brake switch 2, a stability control system 3, a vehicle body controller 4, and the like.
As shown in fig. 1, an embodiment of the present application discloses a brake switch status judging method, which includes the following steps,
s11, judging whether a brake switch signal is credible or not;
s12, judging whether a fault prompt signal of a fault exists in the brake switch 2 or not when the brake switch signal is not credible;
s13, when a fault prompt signal is received, a first signal is received, and whether the first signal is smaller than a first threshold value is judged;
s14, when the first signal is smaller than a first threshold value, judging that the brake switch 2 is not operated;
s15, when the first signal is equal to or greater than the first threshold value, it is determined that the brake switch 2 is operated.
The vehicle has a brake pedal 5 therein, and the brake pedal 5 is a pedal for limiting power for decelerating and stopping. The brake switch 2 is mounted on the brake pedal 5, and controls the brake lamp 1, and when the brake pedal 5 is depressed, the brake switch 2 is turned on, and the brake lamp 1 is turned on. The brake lamp 1 is lighted to warn the driving behavior of the front car brake of the rear car, thereby preventing rear-end collision accidents and the like.
When the brake switch 2 operates, a brake switch signal is sent out to judge whether the brake switch signal is reliable, for example, the output voltage of the brake switch 2 can be collected, and whether the brake switch signal is reliable can be effectively judged through high voltage. For example, when the voltage threshold is 6V and the driver steps on the brake pedal 5, when the output voltage of the brake switch 2 acquired by the vehicle body controller 4 is greater than 6V, the brake switch signal is judged to be effective and reliable 1, and the vehicle body controller 4 controls the brake lamp 1 to be turned on; when the output voltage of the brake switch 2 acquired by the vehicle body controller 4 is less than or equal to 6V, the brake switch signal is judged to be not credible to be 0.
The first threshold and the second threshold are set according to the use requirement.
When the brake switch 2 is judged to be not operated, the brake lamp 1 is not lighted; when it is determined that the brake switch 2 is operated, the brake lamp 1 is turned on.
In the brake switch state judging method in the embodiment of the application, judging whether the brake switch signal of the brake switch 2 is credible, and judging whether a fault prompt signal of a fault of the brake switch 2 is received when the brake switch signal is not credible; when the fault prompting signal is received, the brake switch 2 breaks down, at the moment, the first signal is received again, and whether the first signal is smaller than a first threshold value is judged to judge the state of the brake switch 2. That is, when the brake switch signal is not reliable, the judgment of the state of the brake switch 2 is increased by increasing the judgment of whether the brake switch 2 has a fault or not and the judgment of the first signal, so as to avoid the occurrence of traffic accidents caused by that the brake pedal 5 is stepped on and the brake lamp 1 cannot be turned on and the front vehicle brakes but the rear vehicle cannot judge the front vehicle driving behavior in time due to the fact that the brake lamp 1 is not turned on when, for example, the brake switch 2 operates but the brake switch signal is not reliable. Therefore, the brake switch state judging method in the embodiment of the application has the advantage of being safer.
As shown in fig. 1, in an embodiment, after the step of determining whether the brake switch signal is authentic, step S16 is further included, where it is determined that the brake switch 2 is actuated when the brake switch signal is authentic.
When the brake switch signal is reliable, it is determined that the brake switch 2 is operated, and the brake lamp 1 is turned on. The brake lamp 1 is lighted to remind the rear automobile of the front automobile of the braking action, so that traffic accidents are effectively avoided.
As shown in fig. 1, in an embodiment, the step of determining whether the brake switch 2 has a fault indication signal after receiving the fault indication signal when the brake switch signal is not trusted further includes step S14 of determining that the brake switch 2 is not activated when the fault indication signal is not received.
When the failure indication signal is not received, it is determined that the brake switch 2 is not operated. By increasing the judgment as to whether or not there is a failure in the brake switch 2, the state of the brake switch 2 can be accurately judged.
As shown in fig. 1, in an embodiment, determining whether there is a failure of the brake switch 2 includes the steps of,
s21, judging whether a brake switch signal is credible or not;
s22, judging whether the second signal is larger than a second threshold value or not when the brake switch signal is not credible;
s23, when the second signal is larger than a second threshold value, judging that the brake switch 2 has a fault, and transmitting a fault prompt signal of the fault;
and S24, when the second signal is smaller than or equal to a second threshold value, judging that the brake switch 2 has no fault, and not transmitting a fault prompt signal with fault.
When the brake switch signal is not trusted, whether the brake switch 2 has a fault is determined by determining whether the second signal is greater than a second threshold. That is, when the brake switch signal is not reliable, the judgment of the second signal is added to accurately judge whether the brake switch 2 has a fault. By judging whether the brake switch 2 has a fault, for example, when the brake switch 2 is operated but the brake switch signal is not reliable, the brake lamp 1 cannot be lightened due to the fact that the brake switch 2 is judged to be not operated, so that traffic accidents are caused.
As shown in fig. 1, in an embodiment, after the step of determining whether the brake switch signal is trusted, step S24 is further included, where it is determined that the brake switch 2 has no fault and a fault indication signal that a fault exists is not transmitted when the brake switch signal is trusted.
As shown in fig. 1, in an embodiment, after determining that the brake switch 2 has a fault when the second signal is greater than the second threshold value and transmitting a fault indication signal of the fault, the method further includes step S25 of transmitting the fault indication signal of the fault to the warning member.
The warning part is used for warning the driver that the brake switch 2 breaks down and timely solves the fault of the brake switch 2.
In one embodiment, the warning member is an instrument of a vehicle. The driver obtains the information of the faults of the brake switch 2 through the display in the instrument, and maintains or replaces the brake switch 2 in time, so that accidents caused by the faults of the brake switch 2 are avoided.
As shown in fig. 1, in one embodiment, the brake switch comprises a first member and a second member, wherein the first member is used for receiving a fault indication signal and a first signal that the brake switch 2 has a fault, and judging the state of the brake switch 2; the second piece is used for judging whether the brake switch 2 has a fault or not, and transmitting a fault prompt signal and a first signal that the fault exists.
The first piece is used for executing steps S11 to S16, the second piece is used for executing steps S21 to S25, and the first piece and the second piece respectively execute different steps so as to facilitate the implementation of the brake switch state judging method.
In one embodiment, the first piece is a body controller 4 and the second piece is a stability control system 3; when the stability control system 3 determines whether or not there is a failure in the brake switch 2, the valves and motors in the stability control system 3 are not operated.
The body controller 4 (BCM) refers to an electronic control unit for controlling an electric system of a vehicle body in an automobile engineering, and the body controller 4 may be connected to other vehicle-mounted Electronic Control Units (ECU) through a bus.
The stability control system 3 is an active safety system of the vehicle, is a further expansion of functions of an anti-lock brake system (ABS) and a Traction Control System (TCS) of the vehicle, and on the basis, a yaw rate sensor, a lateral acceleration sensor and a steering wheel angle sensor are added when the vehicle is steering, and driving force and braking force of front and rear wheels and left and right wheels are controlled through an ECU to ensure lateral stability of the vehicle running. The stability control system 3 includes a valve and a motor, and when the valve and the motor are not operated, the influence of the valve and the motor on judging whether the brake switch 2 is faulty can be avoided.
In another embodiment, as in fig. 2, the first signal and the second signal are both master cylinder pressure values.
In another embodiment, determining whether there is a failure of the brake switch 2 includes the steps of:
s31, judging whether a brake switch signal is credible or not;
s32, judging whether the second signal is larger than a second threshold value or not when the brake switch signal is not credible;
s33, when the second signal is larger than a second threshold value, judging that the brake switch 2 has a fault, and transmitting a fault prompt signal of the fault;
s34, when the second signal is smaller than or equal to a second threshold value, judging that the brake switch 2 has no fault, and transmitting a fault prompt signal that no fault exists;
s35, when the brake switch signal is reliable, judging that the brake switch 2 has no fault, and transmitting a fault prompt signal that no fault exists;
s36, transmitting a fault prompt signal of the fault to the warning piece.
At this time, the step of determining the brake switch 2 is:
s41, judging whether a brake switch signal is credible or not;
s42, judging whether a fault prompt signal of a fault exists in the brake switch 2 or not when the brake switch signal is not reliable;
s43, receiving a first signal when a fault prompt signal with a fault is received, and judging whether the first signal is smaller than a first threshold value;
s44, when the first signal is smaller than a first threshold value, judging that the brake switch 2 is not operated;
s45, when the first signal is larger than or equal to a first threshold value, judging that the brake switch 2 is operated;
s46, when the brake switch signal is reliable, judging that the brake switch 2 is operated;
s47, when a failure indication signal indicating that there is no failure is received, it is determined that the brake switch 2 is not operated.
In the brake switch state judging method in the embodiment of the application, judging strategies about whether the brake switch 2 has a fault or not and the behavior of the brake switch 2 are respectively added through the stability control system 3 and the vehicle body controller 4, so that the problem that a rear vehicle cannot be reminded of braking of the front vehicle due to the fact that the brake switch 2 has a fault is avoided, and the problem that traffic accidents are easy to occur is solved.
The embodiment of the application also discloses a brake switch state judging system which comprises a brake lamp 1, a brake switch 2, a stable control system 3, a vehicle body controller 4 and a brake pedal 5, wherein the brake lamp 1 is used for warning the brake state so as to prevent rear-end collision accidents; the brake switch 2 is used for outputting a brake switch signal; the stability control system 3 is connected with the brake switch 2 and is used for judging whether the brake switch 2 has a fault or not; the vehicle body controller 4 is connected with the brake lamp 1, the brake switch 2 and the stability control system 3, and is configured to determine a state of the brake switch 2 according to a fault prompting signal and a first signal transmitted by the stability control system 3, and control the brake lamp 1 to be turned on according to the state of the brake switch 2.
Specifically, in a general vehicle, the brake lamp 1 includes a high-mounted brake lamp, a two-sided brake lamp, and the like.
In actual operation, the working strategy of the brake switch state judging system is as follows:
the vehicle body controller 4 collects the output voltage of the brake switch 2 through a hard wire, and effectively judges whether the brake switch signal is credible or not through high voltage. For example, when the voltage threshold is set to be 6V and a driver steps on the brake pedal 5, when the output voltage of the brake switch 2 acquired by the vehicle body controller 4 is greater than 6V, the brake switch signal is judged to be effective and reliable 1, and the vehicle body controller 4 controls the brake lamp 1 to be lightened; when the output voltage of the brake switch 2 acquired by the vehicle body controller 4 is less than or equal to 6V, judging that the brake switch signal is not credible to be 0; and when the brake switch signal is not trusted, performing the next judgment.
The master cylinder pressure signal of the stability control system 3 is adjusted to be still valid when it is determined that the brake switch 2 is malfunctioning. When the master cylinder pressure is greater than the second threshold value, the brake switch 2 is judged to be faulty, and at the moment, the stable control system 3 transmits a fault prompt signal indicating that the brake switch 2 is faulty, and effectively continues to send a true value to the CAN network by the master cylinder pressure as the first signal.
The body controller 4 determines whether the driver has stepped on the brake pedal 5 by receiving the read master cylinder pressure from the CAN network. When the vehicle body controller 4 judges that the brake switch signal is set to 0, if a fault prompt signal with a fault is not received, and the fault prompt signal is 0 at the moment, judging that a driver does not have brake action, and the brake lamp 1 is not lightened; if a fault prompt signal of a fault exists in the brake switch 2 is received, the fault prompt signal is 1 at the moment, the master cylinder pressure is judged at the same time, and if the master cylinder pressure is smaller than a second threshold value, the driver is judged to have no brake stepping action, and the brake lamp 1 is not lightened; if the master cylinder pressure is equal to or higher than the second threshold value, the driver is judged to have a brake stepping action, and the brake lamp 1 is turned on.
The judging strategies about whether the brake switch 2 has a fault or not and the behavior of the brake switch 2 are respectively added through the stability control system 3 and the vehicle body controller 4, so that the problem that a rear vehicle cannot be reminded of braking of the front vehicle due to the fault of the brake switch 2 is avoided, and the brake switch state judging system has the advantage of being safer.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A method for judging the state of a brake switch is characterized by comprising the following steps,
judging whether the brake switch signal is credible or not;
when the brake switch signal is not credible, judging whether a fault prompt signal of a fault of the brake switch (2) is received or not;
when a fault prompt signal is received, a first signal is received, and whether the first signal is smaller than a first threshold value is judged;
when the first signal is smaller than a first threshold value, judging that the brake switch (2) is not operated;
when the first signal is equal to or greater than a first threshold value, the braking switch (2) is judged to be operated.
2. The method for judging a state of a brake switch according to claim 1, further comprising the step of, after judging whether the brake switch signal is authentic,
when the brake switch signal is reliable, the brake switch (2) is judged to be operated.
3. The method according to claim 1, wherein the step of judging whether or not a failure indication signal indicating a failure of the brake switch (2) has been received when the brake switch signal is not authentic, further comprises the step of,
when the failure indication signal is not received, it is determined that the brake switch (2) is not operated.
4. The brake switch state judgment method according to claim 1, wherein judging whether the brake switch (2) has a failure or not comprises the steps of,
judging whether the brake switch signal is credible or not;
when the brake switch signal is not trusted, judging whether the second signal is larger than a second threshold value or not;
when the second signal is larger than a second threshold value, judging that the brake switch (2) has a fault, and transmitting a fault prompt signal of the fault;
and when the second signal is smaller than or equal to a second threshold value, judging that the brake switch (2) has no fault, and transmitting no fault prompt signal with fault.
5. The method of claim 4, wherein after the step of determining whether the brake switch signal is authentic, further comprising the step of,
when the brake switch signal is credible, the brake switch (2) is judged to be fault-free, and a fault prompt signal with faults is not transmitted.
6. The method according to claim 4, wherein the step of determining that the brake switch (2) has a failure when the second signal is greater than the second threshold value, and transmitting a failure indication signal indicating the failure, further comprises the step of,
and transmitting a fault prompt signal of the fault to the warning piece.
7. The method for determining a brake switch state according to claim 4, comprising,
a first part for receiving a fault indication signal and a first signal indicating that the brake switch (2) has a fault and judging the state of the brake switch (2);
and the second piece is used for judging whether the brake switch (2) has faults or not and transmitting fault prompt signals and first signals of the faults.
8. The brake switch state determination method according to claim 7, wherein the first member is a vehicle body controller (4) and the second member is a stability control system (3);
when the stability control system (3) determines whether or not there is a failure in the brake switch (2), the valve and the motor in the stability control system (3) are not operated.
9. The brake switch state determination method according to claim 7, wherein the first signal and the second signal are both master cylinder pressure values.
10. A brake switch state judging system is characterized by comprising,
a brake lamp (1) for warning a braking state to prevent a rear-end collision accident;
a brake switch (2) for outputting a brake switch signal;
a stable control system (3) connected with the brake switch (2) and used for judging whether the brake switch (2) has faults or not;
and the vehicle body controller (4) is connected with the brake lamp (1), the brake switch (2) and the stable control system (3) and is used for judging the state of the brake switch (2) according to the fault prompt signal and the first signal transmitted by the stable control system (3) and controlling the brake lamp (1) to be lightened according to the state of the brake switch (2).
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| CN202111479480.0A CN116215486A (en) | 2021-12-06 | 2021-12-06 | Brake switch state judging method and system |
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| CN202111479480.0A CN116215486A (en) | 2021-12-06 | 2021-12-06 | Brake switch state judging method and system |
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