CN110749817A - Brake lamp switch fault detection method and device - Google Patents
Brake lamp switch fault detection method and device Download PDFInfo
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- CN110749817A CN110749817A CN201910953646.4A CN201910953646A CN110749817A CN 110749817 A CN110749817 A CN 110749817A CN 201910953646 A CN201910953646 A CN 201910953646A CN 110749817 A CN110749817 A CN 110749817A
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Abstract
The embodiment of the invention provides a brake lamp switch fault detection method and device. The method comprises the following steps: acquiring a pressure validity signal and a pressure value of a brake master cylinder in real time; acquiring state signals of two brake lamp switches in real time; and if the current brake master cylinder pressure validity signal indication is detected to be valid, judging whether the following conditions are met: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is larger than a preset pressure threshold value, and if the states are met, the brake lamp switches are determined to be in fault. The embodiment of the invention improves the accuracy of the detection of the brake lamp switch fault.
Description
Technical Field
The invention relates to the technical field of switches, in particular to a brake lamp switch fault detection method and device.
Background
With the improvement of living standard of people, automobiles are closely related to the life of people. The safety of automobiles is therefore becoming increasingly important.
The brake lamp switch plays an important role in the whole vehicle, the brake lamp switch is an essential part in the design of the whole vehicle, and the brake lamp switch used in the automatic transmission vehicle and the electric vehicle is a two-way switch, wherein the brake lamp switch is normally open on one way and normally closed on the other way.
The normal condition of two way switches of stop lamp switch promptly, the synchronization state is as shown in table 1, and wherein, I way is normally open, and II way is normally closed:
TABLE 1 brake lamp on-off synchronization status
As can be seen from table 1, in the non-braking state, the switch in the path I is 0 (off), and the switch in the path II is 1 (on), which indicates that the two switches are synchronized, i.e., the state is normal; in the braking state, the switch in the path I is 1 (on), and the switch in the path II is 0 (off), which indicates that the two paths of switches are synchronous, namely the state is normal.
The abnormal state of two way switches of stop lamp switch promptly, asynchronous state is as shown in table 2, and wherein, I way is normally open, and II way is normally closed:
TABLE 2 asynchronous state of brake light switch
As can be seen from table 2, in both the non-braking state and the braking state, the switches in the I path and the II path are simultaneously 0 (off), or the switches in the I path and the II path are simultaneously 1 (on), which indicates that the two paths of switches are not synchronized, i.e., the state is abnormal.
Due to the manufacturing precision problem of the brake lamp switch, the phenomenon that two paths of switches are switched on or off at the same time can occur, and a stroke interval of the two paths of switches which are switched on or off at the same time is called a transition area of the brake lamp switch; in addition, brake light switch and VCU (Vehicle Control Unit) wiring harnesses may have real fault problems due to open or broken circuits. In the control, the normal transition region and the actual fault need to be distinguished and processed.
Disclosure of Invention
The embodiment of the invention provides a brake lamp switch fault detection method and device, and aims to improve the accuracy of brake lamp switch fault detection.
The technical scheme of the embodiment of the invention is realized as follows:
a brake light switch fault detection method, the method comprising:
acquiring a pressure validity signal and a pressure value of a brake master cylinder in real time;
acquiring state signals of two brake lamp switches in real time;
when the current brake master cylinder pressure validity signal indication is detected to be valid, whether the following conditions are met is judged: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is greater than a preset pressure threshold value,
and if so, determining that the brake lamp switch has a fault.
The method further comprises the step of acquiring the state signals of the two brake lamp switches in real time
Judging whether the states of the two paths of brake switches are synchronous or not;
if the two brake lights are synchronous, timing the synchronous duration of the on-off states of the two brake lights;
and if the two paths of brake lamps are asynchronous, timing the asynchronous continuous time of the switch states of the two paths of brake lamps.
The method further comprises:
if the current brake master cylinder pressure validity signal indicates invalidity, judging whether the current vehicle speed is greater than a preset vehicle speed threshold value;
if the current vehicle speed is greater than the preset vehicle speed threshold, judging whether the asynchronous duration of the on-off states of the two brake lights is greater than a preset first time threshold, and if so, determining that the brake lights are in failure;
if the current vehicle speed is not greater than the preset vehicle speed threshold, judging whether the asynchronous continuous time of the on-off states of the two brake lights is greater than a preset second time threshold, and if so, determining that the brake lights are in failure;
wherein the preset second duration threshold > the preset first duration threshold.
The crawling vehicle speed of the vehicle is less than or equal to the preset vehicle speed threshold value and less than or equal to (the crawling vehicle speed of the vehicle is less than or equal to 0.5) km/h;
the preset first time length threshold value is less than or equal to 25s and is less than or equal to 15 s;
the preset second duration threshold is less than or equal to 140s when the time is less than or equal to 100 s.
After determining the failure of the stop lamp switch, the method further comprises:
acquiring the state signals of the two brake lamp switches in real time,
judging whether the switch states of the two brake lights are synchronous or not,
if yes, timing the synchronous duration of the on-off states of the two brake lights;
and if the detected synchronous duration of the switch states of the two brake lights is greater than a preset third duration threshold, determining that the brake light switch fault disappears and recovering to be normal.
The preset third duration threshold is less than or equal to 25s and is less than or equal to 15 s.
The pressure maximum value of the brake master cylinder in the brake lamp switch transition region is +3) bar which is less than or equal to the preset pressure threshold value is less than or equal to (the pressure maximum value of the brake master cylinder in the brake lamp switch transition region is +5) bar.
A brake light switch fault detection device, the method comprising:
the brake master cylinder pressure information acquisition module is used for acquiring a brake master cylinder pressure validity signal and a brake master cylinder pressure value in real time;
the brake lamp switch state acquisition module is used for acquiring state signals of two brake lamp switches in real time;
and the fault detection module is used for judging whether the brake lamp switch has a fault according to the pressure validity signal of the brake master cylinder and the state signals of the two brake lamp switches.
The stop lamp switch state acquisition module is further used for,
and the state signals of the two brake lamp switches are synchronously or asynchronously timed for the duration.
The failure detection module further operates after determining that the brake light switch has failed,
determining whether the brake light switch failure has disappeared, returned to normal, and/or
And sending the brake lamp switch fault prompt to an instrument controller, controlling the instrument to display fault information, and limiting the power output of the vehicle through a power controller.
When the embodiment of the invention detects that the current pressure validity signal of the brake master cylinder indicates validity, whether the following requirements are met is judged: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is larger than a preset pressure threshold value, and if the states of the two brake lamp switches are not synchronous, the brake lamp switch fault is determined, so that the transition area of the brake lamp switch is distinguished from the real fault of the brake lamp switch, and the accuracy of brake lamp switch fault detection is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a failure of a stop lamp switch according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a failure of a stop lamp switch according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a brake light switch fault detection apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Detection of a brake light switch failure has been achieved by performing logical judgment and control using an accelerator pedal sensor, an ESP (Electronic Stability Program) controller, a brake switch sensor, a vehicle speed sensor interface, and the like.
The inventor finds out through analysis that: in practical application, the pressure signal and the pressure value of the brake master cylinder are also related to the brake lamp switch fault, so that the brake lamp switch fault detection scheme provided by the invention is provided.
Fig. 1 is a flowchart of a method for detecting a failure of a stop lamp switch according to an embodiment of the present invention, which includes the following steps:
step 101: and acquiring a pressure validity signal of the brake master cylinder and a pressure value of the brake master cylinder in real time.
Step 102: and acquiring state signals of two brake lamp switches in real time.
Step 103: and if the current brake master cylinder pressure validity signal indication is detected to be valid, judging whether the following conditions are met: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is larger than a preset pressure threshold value, and if the states are met, the brake lamp switches are determined to be in fault.
The states of the two brake lamp switches (i.e. the normally open switch and the normally closed switch) are asynchronous, that is, the state signals of the two brake lamp switches are simultaneously 0 (i.e. simultaneously on) or simultaneously 1 (i.e. simultaneously off).
In an optional embodiment, in step 102, after acquiring the status signals of the two brake light switches in real time, the method further includes:
judging whether the states of the two paths of brake switches are synchronous or not;
if the two brake lights are synchronous, timing the synchronous duration of the on-off states of the two brake lights;
and if the two paths of brake lamps are asynchronous, timing the asynchronous continuous time of the on-off states of the two paths of brake lamps.
In an optional embodiment, if the current brake master cylinder pressure validity signal indicates invalidity, whether the current vehicle speed is greater than a preset vehicle speed threshold value or not is judged, if the current vehicle speed is greater than the preset vehicle speed threshold value, whether the unsynchronized duration of the on-off states of the two brake lights is greater than a preset first duration threshold value or not is judged, and if yes, the brake light on-off fault is determined; if the current vehicle speed is not greater than the preset vehicle speed threshold, judging whether the unsynchronized continuous time of the on-off states of the two brake lights is greater than a preset second time threshold, and if so, determining the failure of the brake light switch; wherein the second duration threshold > the first duration threshold.
In an optional embodiment, the crawling vehicle speed of the vehicle is less than or equal to (1.5) km/h and less than or equal to a preset vehicle speed threshold value and less than or equal to (0.5) km/h;
in an alternative embodiment, 15s is less than or equal to a preset first time threshold value is less than or equal to 25 s;
in an alternative embodiment, 100s is less than or equal to the predetermined second duration threshold value is less than or equal to 140 s.
In an alternative embodiment, determining the failure of the stop lamp switch further comprises:
acquiring state signals of two brake lamp switches in real time,
judging whether the switch states of the two brake lights are synchronous or not,
if yes, timing the synchronous duration of the on-off states of the two brake lights;
and if the detected synchronous duration of the switch states of the two brake lights is greater than a preset third duration threshold, determining that the brake light switch fault disappears and recovering to be normal.
In an alternative embodiment, 15s is ≦ 25s for the predetermined third duration threshold.
In an optional embodiment, the value range of the preset pressure threshold is as follows:
the pressure maximum value of the brake master cylinder in the brake lamp switch transition area is +3) bar which is less than or equal to the preset pressure threshold value is less than or equal to (the pressure maximum value of the brake master cylinder in the brake lamp switch transition area is +5) bar.
In an alternative embodiment, determining the failure of the stop lamp switch further comprises:
sending a brake lamp switch fault prompt to an instrument controller so that the instrument controller can light a brake fault lamp and a whole vehicle system fault lamp; and limits the vehicle power output.
The execution main body of the embodiment can be a vehicle control unit as follows: VCU or VBU.
Fig. 2 is a flowchart of a method for detecting a failure of a stop lamp switch according to another embodiment of the present invention, which includes the following specific steps:
step 201: the VCU acquires the brake master cylinder pressure validity signal and the brake master cylinder pressure value sent by the ESP controller from the CAN bus in real time.
The ESP controller CAN judge the pressure effectiveness of the brake master cylinder in real time and report the pressure effectiveness signal of the brake master cylinder to the VCU in real time through the CAN bus.
Step 202: the VCU acquires the state signals of the two brake lamp switches in real time.
The VCU is connected with each brake lamp switch through a hard wire, and the state signals of each brake lamp switch are transmitted to the VCU in real time through the hard wire.
Step 203: the VCU judges whether the current brake master cylinder pressure validity signal indicates validity or not, if yes, step 204 is executed; otherwise, step 205 is performed.
Step 204: the VCU judges whether the following conditions are met currently: the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is greater than a preset pressure threshold value, and if yes, step 208 is executed; otherwise, step 209 is performed.
Step 205: the VCU judges whether the current vehicle speed is greater than a preset vehicle speed threshold value, if so, the step 206 is executed; otherwise, step 207 is performed.
Step 206: the VCU judges whether the asynchronous duration of the two brake lamp switches is greater than a preset first time threshold value or not, and if yes, the step 208 is executed; otherwise, step 209 is performed.
Step 207: the VCU judges whether the asynchronous duration of the two brake lamp switches is greater than a preset second duration threshold or not, if so, the step 208 is executed; otherwise, step 209 is performed.
The second duration threshold is less than the first duration threshold.
Step 208: and the VCU determines that the brake lamp switch has a fault, sends fault information to the instrument controller, the instrument controller lights the fault lamp, and meanwhile, the VCU limits the power output of the vehicle, and the process is finished.
And after the brake lamp switch fault is determined, the VCU continuously outputs the brake lamp switch fault prompt until the VCU detects that the synchronous continuous time of the two brake lamp switch states is greater than a preset third time threshold, the brake lamp fault is determined to disappear, the VCU is recovered to be normal, and the brake lamp switch fault prompt is stopped being output.
In an alternative embodiment, the meter controller illuminating the fault light includes: and (5) lighting a brake fault lamp and a vehicle system fault lamp.
Limiting the vehicle power output includes: determining a required torque according to the highest driving speed (such as 60km/h) of a preset brake lamp switch in failure and the depth of an accelerator pedal, sending the required torque to a motor controller to ensure that a vehicle can be driven to a maintenance factory for maintenance treatment, and simultaneously informing an instrument controller of 'limited power driving' by words on the instrument through a VCU.
Specifically, the required torque is calculated according to the depth of an accelerator pedal, and if the vehicle speed corresponding to the calculated required torque is larger than the highest driving vehicle speed under the fault of a preset brake light switch, the required torque is adjusted to a value corresponding to the highest driving vehicle speed (such as 60km/h) under the fault of the preset brake light switch.
In addition, the VCU cancels the creep function after determining that the brake light switch is faulty.
Step 209: the VCU determines that the brake light switch is not faulty.
Fig. 3 is a schematic structural diagram of a brake light switch fault detection device provided in an embodiment of the present invention, and the device mainly includes: a master cylinder pressure information obtaining module 31, a brake lamp switch state obtaining module 32 and a fault detecting module 33, wherein:
and the master cylinder pressure information acquisition module 31 is used for acquiring the master cylinder pressure validity signal and the master cylinder pressure value from the ESP controller in real time.
And the stop lamp switch state acquisition module 32 is used for acquiring state signals of two paths of stop lamp switches in real time.
And the fault detection module 33 is configured to determine whether the brake light switch has a fault according to the effective brake master cylinder pressure signal and the pressure value of the brake master cylinder obtained by the master cylinder pressure information obtaining module 31, and the state signals of the two brake light switches obtained by the brake light switch state obtaining module 32.
In an optional embodiment, the stop lamp switch state obtaining module 32 is further configured to time the synchronous or asynchronous duration of the two stop lamp switch state signals.
In an alternative embodiment, the fault detection module 33 is further configured to determine whether the brake light switch fault has disappeared, to recover from normality, and/or to send a brake light switch fault indication to the meter controller, to control the meter to display fault information, and to limit vehicle power output via the power controller after determining the brake light switch fault.
In an optional embodiment, the fault detection module 33 is specifically configured to, when it is detected that the current indication of the valid signal of the pressure of the brake master cylinder is valid according to the valid signal of the pressure of the brake master cylinder obtained by the master cylinder pressure information obtaining module 31 in real time, determine whether the following conditions are satisfied according to the state signals of the two brake light switches obtained by the brake light switch state obtaining module 32 in real time and the master cylinder pressure value obtained by the master cylinder pressure information obtaining module 31 in real time: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is larger than a preset pressure threshold value, and if the states are met, the brake lamp switches are determined to be in fault.
In an alternative embodiment, the failure detection module 33 is further configured to,
if the current brake master cylinder pressure validity signal indicates invalidity, judging whether the current vehicle speed is greater than a preset vehicle speed threshold value;
if the current vehicle speed is greater than a preset vehicle speed threshold value, judging whether the unsynchronized duration of the on-off states of the two brake lights is greater than a preset first duration threshold value or not, and if so, determining that the brake lights are in failure;
if the current vehicle speed is not greater than the preset vehicle speed threshold, judging whether the unsynchronized continuous time of the on-off states of the two brake lights is greater than a preset second time threshold, and if so, determining the failure of the brake light switch;
wherein the second duration threshold > the first duration threshold.
In an optional embodiment, the fault detection module 33 is further configured to, after determining that the stop lamp switch has a fault, obtain state signals of the two stop lamp switches in real time, determine whether the two stop lamp switches are synchronized, and if so, time the duration of the synchronization of the two stop lamp switches; and if the detected synchronous duration of the switch states of the two brake lights is greater than a preset third duration threshold, determining that the brake light switch fault disappears and recovering to be normal.
In an optional embodiment, the device is located in a vehicle control unit.
In an optional embodiment, the vehicle control unit is a VCU or a VBU.
The embodiment of the invention has the following beneficial technical effects:
when a brake master cylinder pressure signal is effective, whether the following conditions are met is judged: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is larger than a preset pressure threshold value, and if the states are met, the brake lamp switches are determined to be in fault. And the inventor finds out through analysis that: when the two brake lamp switches are in a transition region (namely a stroke region which is simultaneously conducted or disconnected), the pressure value of the brake master cylinder is not greater than a preset pressure threshold value, and when the brake lamp switches have a real fault, when a driver steps on a brake pedal to start a vehicle or brake a vehicle, the pressure value of the brake master cylinder is greater than the preset pressure threshold value, so that the transition region of the brake lamp switches is separated from the real fault, and the fault detection accuracy of the brake lamp switches is improved.
Secondly, judging whether the current vehicle speed is greater than a preset vehicle speed threshold value or not when the pressure signal of the brake master cylinder is invalid; if the current vehicle speed is greater than a preset vehicle speed threshold value, judging whether the unsynchronized duration of the on-off states of the two brake lights is greater than a preset first duration threshold value or not, and if so, determining that the brake lights are in failure; if the current vehicle speed is not greater than the preset vehicle speed threshold, judging whether the unsynchronized continuous time of the on-off states of the two brake lights is greater than a preset second time threshold, and if so, determining the failure of the brake light switch; wherein the second duration threshold > the first duration threshold. Therefore, the brake lamp switch fault detection when the pressure signal of the brake master cylinder is invalid is realized, the brake lamp switch fault detection accuracy is further improved, and the brake lamp switch fault can be detected in any state of the vehicle.
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 made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A brake light switch fault detection method, the method comprising:
acquiring a pressure validity signal and a pressure value of a brake master cylinder in real time;
acquiring state signals of two brake lamp switches in real time;
when the current brake master cylinder pressure validity signal indication is detected to be valid, whether the following conditions are met is judged: the states of the two brake lamp switches are asynchronous, the pressure value of the brake master cylinder is greater than a preset pressure threshold value,
and if so, determining that the brake lamp switch has a fault.
2. The method of claim 1, wherein the obtaining the status signals of the two brake light switches in real time further comprises
Judging whether the states of the two paths of brake switches are synchronous or not;
if the two brake lights are synchronous, timing the synchronous duration of the on-off states of the two brake lights;
and if the two paths of brake lamps are asynchronous, timing the asynchronous continuous time of the switch states of the two paths of brake lamps.
3. The method of claim 2, further comprising:
if the current brake master cylinder pressure validity signal indicates invalidity, judging whether the current vehicle speed is greater than a preset vehicle speed threshold value;
if the current vehicle speed is greater than the preset vehicle speed threshold, judging whether the asynchronous duration of the on-off states of the two brake lights is greater than a preset first time threshold, and if so, determining that the brake lights are in failure;
if the current vehicle speed is not greater than the preset vehicle speed threshold, judging whether the asynchronous continuous time of the on-off states of the two brake lights is greater than a preset second time threshold, and if so, determining that the brake lights are in failure;
wherein the preset second duration threshold > the preset first duration threshold.
4. The method of claim 3,
the crawling vehicle speed of the vehicle is less than or equal to the preset vehicle speed threshold value and less than or equal to (the crawling vehicle speed of the vehicle is less than or equal to 0.5) km/h;
the preset first time length threshold value is less than or equal to 25s and is less than or equal to 15 s;
the preset second duration threshold is less than or equal to 140s when the time is less than or equal to 100 s.
5. The method of claim 1, wherein the determining after the brake light switch failure further comprises:
acquiring the state signals of the two brake lamp switches in real time,
judging whether the switch states of the two brake lights are synchronous or not,
if yes, timing the synchronous duration of the on-off states of the two brake lights;
and if the detected synchronous duration of the switch states of the two brake lights is greater than a preset third duration threshold, determining that the brake light switch fault disappears and recovering to be normal.
6. The method of claim 5, wherein 15s ≦ 25s for the preset third duration threshold.
7. The method of claim 1,
the pressure maximum value of the brake master cylinder in the brake lamp switch transition region is +3) bar which is less than or equal to the preset pressure threshold value is less than or equal to (the pressure maximum value of the brake master cylinder in the brake lamp switch transition region is +5) bar.
8. A brake light switch fault detection device, the method comprising:
the brake master cylinder pressure information acquisition module is used for acquiring a brake master cylinder pressure validity signal and a brake master cylinder pressure value in real time;
the brake lamp switch state acquisition module is used for acquiring state signals of two brake lamp switches in real time;
and the fault detection module is used for judging whether the brake lamp switch has a fault according to the pressure validity signal of the brake master cylinder and the state signals of the two brake lamp switches.
9. The apparatus of claim 8, wherein the stop lamp switch status acquisition module is further configured to,
and the state signals of the two brake lamp switches are synchronously or asynchronously timed for the duration.
10. The apparatus of claim 8, wherein the fault detection module is further configured to, after determining that the stop lamp switch has failed,
determining whether the brake light switch failure has disappeared, returned to normal, and/or
And sending the brake lamp switch fault prompt to an instrument controller, controlling the instrument to display fault information, and limiting the power output of the vehicle through a power controller.
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| CN113276819A (en) * | 2021-06-03 | 2021-08-20 | 东风汽车集团股份有限公司 | Fault processing method and system for brake switch and computer storage medium |
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| CN108791060A (en) * | 2018-06-14 | 2018-11-13 | 安徽江淮汽车集团股份有限公司 | A kind of braking light switch method for diagnosing faults and device |
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| CN111959414A (en) * | 2020-07-20 | 2020-11-20 | 浙江零跑科技有限公司 | Method for diagnosing brake lamp switch of electric passenger vehicle |
| CN113276819A (en) * | 2021-06-03 | 2021-08-20 | 东风汽车集团股份有限公司 | Fault processing method and system for brake switch and computer storage medium |
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