A method and system for detecting brake pedal opening degree

Abstract

The application relates to a brake pedal opening and closing degree detection method and system, wherein the method comprises the following steps: when the pedal is stepped on, a voltage signal is generated by changing the voltage; when the pedal is stepped on, a triangular wave signal is generated; the voltage signal and the triangular wave signal are output and amplitude modulation is carried out; the signal after amplitude modulation is converted into a PWM signal; the PWM signal is output to a vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle. The opening and closing degree detection method provided by the application carries out amplitude modulation on the generated voltage signal and triangular wave signal when the pedal is stepped on, converts the signals into PWM signals, the vehicle body controller receives the PWM signals and identifies the stepping depth according to the duty cycle. Therefore, the stepping degree of the brake pedal can be judged every time the pedal is stepped on, the stepping depth of each time can be obtained in time when needed, the driving record is more complete, and great convenience is provided for possible accident analysis.

Description

TECHNICAL FIELD

[0001] The application relates to a brake pedal opening and closing degree detection method and a brake pedal opening and closing degree detection system, and belongs to the technical field of automobile control. BACKGROUND

[0002] The setting of an automobile brake system can technically ensure the safe driving of an automobile and improve the average speed of the automobile, and is a key device for safe driving of a vehicle.

[0003] At present, the brake pedal of an existing automobile has a traditional and single structure and is not provided with an opening and closing degree detection function. In actual use, mechanical control is basically relied on mechanical structures and hydraulic devices. At this time, passengers and drivers cannot determine the stepping depth in the driving process, and cannot record the brake force of the vehicle according to the brake opening and closing degree, the stepping depth, which causes certain difficulties in the analysis of possible future driving records and accidents.

[0004] In addition, when a vehicle is driving on a standard road, the fixed stepping depth and vehicle speed will have a fixed brake distance. At present, the mainstream active safety auxiliary driving is only involved when the vehicle is too close to a pedestrian or other vehicles, and thus the active safety system is poor in effect when the vehicle speed exceeds 50 KM / H, and problems such as sudden braking, braking failure and collision occur when danger occurs.

[0005] The brake cannot be confirmed to be attenuated on different road surfaces according to the brake opening and closing degree, and the road surface condition cannot be judged. The driver cannot adjust the vehicle speed in a timely manner according to the actual situation, and a major safety hazard is left.

[0006] Because there is no opening and closing degree detection, the vehicle owner cannot determine whether the brake is attenuated on the same road surface and with the same stepping depth, cannot predict the brake pad wear degree, and can only go to a special repair shop or 4S shop to know. Going to a 4S shop will generate labor costs, but if the brake pad is still good at this time, money and time are wasted. If the brake pad is already excessively worn before the replacement of the brake pad reaches the limit or mileage, it will cause a great safety hazard to the vehicle owner, the passengers and other road participants.

[0007] For example, the problem of the vehicle owner frequently seeking rights and interests is currently often encountered. The vehicle owner indicates that the brake pedal is stepped to the bottom, the vehicle still does not slow down, and multiple accidents have occurred. Through the data uploaded to the cloud by the automobile, it can only be shown that the vehicle owner has / stops stepping on the brake pedal, but the stepping depth cannot be analyzed, and whether the vehicle owner only lightly steps on the brake cannot be judged.

[0008] Therefore, how to detect the opening and closing degree of the brake pedal is a problem to be solved by those skilled in the art. SUMMARY

[0009] The problem to be solved by the present application is to provide a brake pedal opening and closing degree detection method to solve the above problems of the prior art.

[0010] When the pedal is stepped on, the voltage changes, and a voltage signal is generated;

[0011] When the pedal is stepped on, a triangular wave signal is generated;

[0012] The voltage signal and the triangular wave signal are output and amplitude modulated;

[0013] The amplitude modulated signal is converted into a PWM signal;

[0014] The PWM signal is output to the vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle.

[0015] Preferably, before stepping on the pedal, it further comprises: setting the corresponding relationship between the vehicle speed, the stepping depth and the brake distance in the vehicle body controller.

[0016] When the opening and closing degree detection and the data corresponding to different stepping depths corresponding to different brake distances are provided, the vehicle can automatically make safety avoidance actions according to the stepping depth and the actual distance.

[0017] In addition, it can also assist the driver to judge the brake wear condition when the vehicle braking distance is extended and the efficiency is reduced under the same stepping depth.

[0018] Preferably, the stepping depth is identified according to the duty cycle, which further comprises: judging whether the brake distance of the vehicle at the current vehicle speed and the stepping depth satisfies the corresponding relationship.

[0019] Preferably, when the brake distance exceeds the maximum value under the corresponding relationship, the user is prompted to repair the brake system.

[0020] Preferably, the stepping depth is identified according to the duty cycle, which further comprises: judging whether the vehicle distance from the front vehicle at the current vehicle speed and the stepping depth satisfies the safe brake distance.

[0021] Preferably, before stepping on the pedal, it further comprises: setting the suggested parameter value of the stepping depth under different road conditions in the vehicle body controller in advance.

[0022] When the vehicle is driving on the ice and snow road, it can assist the ABS (anti-lock brake system) to prevent the stepping depth from being too deep and to prevent slipping to ensure driving safety.

[0023] Preferably, before stepping on the pedal, it is first judged whether the stepping depth detection is turned on, if yes, the subsequent steps are executed to generate the corresponding signal when stepping; if not, the brake is directly executed.

[0024] The detection method of the opening and closing degree provided by the application modulates the generated voltage signal and the triangular wave signal in amplitude when stepping on, and converts them into PWM signals, and the vehicle body controller receives the PWM signals and identifies the stepping depth according to the duty cycle. Therefore, the stepping degree of the brake pedal can be judged every time when stepping on, and the stepping depth of each time can be obtained in time when needed, so that the driving record is more complete, and great convenience is provided for the analysis of possible accidents.

[0025] A detection system of the opening and closing degree of a brake pedal, comprising a brake pedal, further comprising a sliding rheostat arranged on the brake pedal, a triangular wave generator and a pulse width modulator connected with the sliding rheostat, and the triangular wave generator and the pulse width modulator are connected with a vehicle body controller.

[0026] Preferably, the triangular wave generator is a digital analog converter or a triangular wave generation chip.

[0027] Preferably, the triangular wave generator and the pulse width modulator are integrated into a chip.

[0028] The detection system of the opening and closing degree of the brake pedal of the application sets a sliding rheostat on the brake pedal, which can change according to the stepping degree of the pedal when stepping on the pedal, and the corresponding changes are recorded and processed by the triangular wave generator and the pulse width modulator, and fed back to the vehicle body controller, and then the stepping depth is identified and recorded. The monitoring system realizes real-time monitoring of the pedal, can timely understand the stepping depth of the pedal during driving, perfects the driving record, and realizes monitoring and recording of the brake behavior during driving. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the detection of the opening and closing degree of the brake pedal of the application;

[0030] Figure 2 It is a flow chart of the detection method of the opening and closing degree of the brake pedal of the application;

[0031] Figure 3 It is a flow chart of the detection method of the opening and closing degree of the brake pedal in another embodiment of the application. DETAILED DESCRIPTION

[0032] The application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, but not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the convenience of description, not all the structures.

[0033] Embodiment 1:

[0034] Referring to Figures 1-2 The brake pedal opening and closing degree detection method provided by the present application comprises:

[0035] When the pedal is stepped on, the voltage changes, and a voltage signal is generated;

[0036] When the pedal is stepped on, a triangular wave signal is generated;

[0037] The voltage signal and the triangular wave signal are output and amplitude modulated;

[0038] The amplitude modulated signal is converted into a PWM signal;

[0039] The PWM signal is output to a vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle.

[0040] When the pedal is stepped on, the voltage changes due to the change of the pedal position, at this time, the generated voltage signal and the triangular wave signal are amplitude modulated and converted into a PWM signal output to the vehicle body controller, the vehicle body controller can identify the stepping depth according to the duty cycle, and record the stepping depth, so that the driving record is more comprehensive, and the subsequent standby is facilitated.

[0041] Embodiment 2:

[0042] A corresponding relationship among the vehicle speed, the stepping depth and the brake distance is set in the vehicle body controller;

[0043] The brake pedal opening and closing degree detection method provided by the present application comprises:

[0044] When the pedal is stepped on, the voltage changes, and a voltage signal is generated;

[0045] When the pedal is stepped on, a triangular wave signal is generated;

[0046] The voltage signal and the triangular wave signal are output and amplitude modulated;

[0047] The amplitude modulated signal is converted into a PWM signal;

[0048] The PWM signal is output to a vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle.

[0049] In this embodiment, a corresponding relationship among the vehicle speed, the stepping depth and the brake distance is set, therefore, after the stepping depth is identified by the vehicle body controller, the required braking distance of the vehicle can be known in combination with the current vehicle speed. Of course, whether the vehicle can be safely braked can also be judged according to the current vehicle speed and the distance between the vehicle and the front vehicle.

[0050] When the vehicle has data on the degree of apprehension and the corresponding braking distance for different pedal depths, it can automatically take safety evasive action based on the pedal depth and the actual distance.

[0051] In addition, it can also help drivers judge the condition of brakes when the braking distance of the vehicle increases and the efficiency decreases under the same pedal depth.

[0052] Example 3:

[0053] Set the relationship between vehicle speed, pedal depth, and braking distance in the vehicle control system;

[0054] The method for detecting the opening degree of a brake pedal provided by the present invention includes:

[0055] When the pedal is pressed, the voltage changes, generating a voltage signal;

[0056] When the pedal is pressed, a triangular wave signal is generated;

[0057] Output voltage signal and triangular wave signal and perform amplitude modulation;

[0058] The amplitude-modulated signal is converted into a PWM signal;

[0059] The PWM signal is output to the vehicle body controller, which identifies and records the pedal depth based on the duty cycle;

[0060] Determine whether the vehicle's braking distance meets the corresponding relationship at the current vehicle speed and pedal depth.

[0061] The correspondence mentioned here needs to be set within an appropriate range. For example, given the vehicle speed and pedal depth, the corresponding braking distance is within an appropriate range, and the braking system is in normal condition within this range.

[0062] As a preferred embodiment, when the braking distance exceeds the maximum value under the corresponding relationship, the user is prompted to inspect the braking system.

[0063] When the actual braking distance exceeds the maximum value of the above range, which is beyond the normal braking distance range, it is determined that there is brake fade and the wear of the brake pads has already affected driving. At this time, the driver should be reminded to have the vehicle inspected to avoid safety accidents caused by brake failure.

[0064] Example 4:

[0065] Set the relationship between vehicle speed, pedal depth, and braking distance in the vehicle control system;

[0066] The method for detecting the opening degree of a brake pedal provided by the present invention includes:

[0067] When the pedal is stepped on, the voltage changes, and a voltage signal is generated;

[0068] When the pedal is stepped on, a triangular wave signal is generated;

[0069] The voltage signal and the triangular wave signal are output and amplitude modulated;

[0070] The amplitude modulated signal is converted into a PWM signal;

[0071] The PWM signal is output to the vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle;

[0072] It is judged whether the vehicle-to-vehicle distance at the current vehicle speed and the stepping depth meets the safe braking distance.

[0073] In this embodiment, the corresponding relationship between the vehicle speed, the stepping depth, and the braking distance is set, so that after the vehicle body controller identifies the stepping depth, the braking distance required by the vehicle can be known in combination with the current vehicle speed. Of course, it can also be judged whether the vehicle can brake safely according to the current vehicle speed and the vehicle-to-vehicle distance. If the braking distance is met, the stepping depth can be continued to brake, and if it is not met, the stepping force should be increased in time or other appropriate avoidance measures are adopted to avoid causing greater harm.

[0074] When the opening and closing degree detection and the data corresponding to different stepping depths corresponding to different braking distances are provided, the vehicle can automatically make a safe avoidance action according to the stepping depth and the actual distance.

[0075] In addition, it can also be realized that if the vehicle braking distance is extended and the efficiency is reduced at the same stepping depth, the driver can be assisted to judge the brake wear condition.

[0076] Embodiment 5:

[0077] The recommended parameter value of the stepping depth under different road conditions is set in advance in the vehicle body controller;

[0078] When the pedal is stepped on, the voltage changes, and a voltage signal is generated;

[0079] When the pedal is stepped on, a triangular wave signal is generated;

[0080] The voltage signal and the triangular wave signal are output and amplitude modulated;

[0081] The amplitude modulated signal is converted into a PWM signal;

[0082] The PWM signal is output to the vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle;

[0083] When stepping on the pedal, the voltage changes due to the change of the pedal position, at this time, the generated voltage signal and the triangular wave signal are amplitude modulated, and converted into a PWM signal output to the vehicle body controller, the vehicle body controller can identify the stepping depth according to the duty cycle, and record the stepping depth, so that the driving record is more comprehensive, and the subsequent standby is facilitated.

[0084] And the pre-set recommended parameter value can provide certain help for the driver, especially the novice driver, so that the driver can quickly make a judgment when facing different road conditions.

[0085] For example, when the vehicle is driving on an icy road, the recommended parameter value can be combined with ABS (anti-lock braking system) to prevent over-stepping and slipping, thereby ensuring the safety of driving.

[0086] Embodiment 6:

[0087] Determine whether the stepping depth detection is turned on, if yes, execute the subsequent steps, and generate the corresponding signal when stepping on the pedal; if no, directly execute the braking;

[0088] When stepping on the pedal, the voltage changes, and a voltage signal is generated;

[0089] When stepping on the pedal, a triangular wave signal is generated;

[0090] Output the voltage signal and the triangular wave signal and perform amplitude modulation;

[0091] Convert the amplitude modulated signal into a PWM signal;

[0092] Output the PWM signal to the vehicle body controller, identify and record the stepping depth according to the duty cycle.

[0093] When stepping on the pedal, the voltage changes due to the change of the pedal position, at this time, the generated voltage signal and the triangular wave signal are amplitude modulated, and converted into a PWM signal output to the vehicle body controller, the vehicle body controller can identify the stepping depth according to the duty cycle, and record the stepping depth, so that the driving record is more comprehensive, and the subsequent standby is facilitated.

[0094] As Figure 3 shown, the stepping depth detection is first determined in this application, in the case of turning on, the corresponding voltage signal and triangular wave signal are generated through the brake pedal sliding resistor and triangular wave generator, and the subsequent amplitude modulation, PWM signal conversion and braking steps are executed; if the depth detection is not turned on, the effective braking is directly performed through the hydraulic system and mechanical transmission.

[0095] Embodiment 7:

[0096] Further, the application also provides a brake pedal opening degree detection system, which comprises a brake pedal, a sliding rheostat arranged on the brake pedal, a triangular wave generator connected with the sliding rheostat, and a pulse width modulator connected with the triangular wave generator and the pulse width modulator.

[0097] During driving, if the driver steps on the pedal, a triangular wave is generated, and the voltages of the sliding end and the fixed end of the sliding rheostat connected with the brake pedal change, the voltage signal and the triangular wave signal are input to the pulse width modulator for amplitude modulation, and are converted into a PWM signal, and a position calculation module in the body controller identifies the stepping depth according to the duty cycle.

[0098] The triangular wave generator can generate a triangular wave with a certain frequency, and the specific frequency value can be determined according to the program processing requirement, and the maximum amplitude of the waveform is the same as the power supply voltage of the sliding rheostat. The triangular wave generator can be generated by a DAC (digital analog converter) or a specific chip with a triangular wave generating function. Specifically, the triangular wave generator is a digital analog converter or a triangular wave generating chip.

[0099] The pulse width modulator performs PWM modulation on the carrier wave with the output voltage of the sliding rheostat as the threshold value. The modulated PWM signal is output to the BCM (body controller).

[0100] The BCM position calculation module measures the duty cycle of the PWM signal by a counter in the processor, as shown in the formula (1), and the obtained duty cycle value directly reflects the proportion of the displacement of the sliding end of the sliding rheostat to the total sliding stroke, that is, the proportion of the current opening degree of the brake pedal to the total opening stroke, that is, the stepping depth. Figure 1

[0101] As preferred, the triangular wave generator and the pulse width modulator can also be replaced by an integrated special IC to further simplify the circuit. That is, the triangular wave generator and the pulse width modulator can be an integrated chip.

[0102] The brake pedal opening degree detection system of the application sets the sliding rheostat on the brake pedal, can change according to the stepping degree of the pedal when stepping on the pedal, and records and processes the corresponding changes through the triangular wave generator and the pulse width modulator, and feeds back to the body controller, and then identifies and records the stepping depth. The monitoring system realizes real-time monitoring of the pedal, can timely understand the stepping depth of the pedal during driving, perfects the driving record, and realizes monitoring and recording of the brake behavior during driving.

[0103] In summary, the technical scheme of the application can realize detection of the brake opening degree, facilitate data analysis, restore the scene and trace back after an accident, and greatly improve the solution of the problems of accident accountability and unclear responsibility. ​

[0104] The detection of brake opening and closing degree can be presented to the passenger and the driver, increasing the seniority and business sense of the vehicle, and improving the luxury.

[0105] The detection of brake opening and closing degree can assist in judging the wear degree of brake pads, helping to save the use cost of the vehicle and improve the safety factor of use.

[0106] The safety factor of the vehicle safety auxiliary driving is increased, and abnormal judgment of the auxiliary driving safety system is prevented.

[0107] The precision is extremely high, the digital signal is strong, the anti-interference ability is strong, the electromagnetic radiation and environmental factors are not afraid, and the module can work in more complex conditions.

[0108] The cost is low, the price is close to one time lower than that of the traditional sampling through the ADC (analog-to-digital converter), and the use cost is lower.

[0109] Calibration is not required, which is beneficial to production and convenient for maintenance, and the whole module can be integrally installed and replaced.

[0110] The pulse width modulation mentioned above can use a triangular wave and a voltage of a sliding rheostat to pass through a comparator, so as to modulate the PWM signal. Or refer to GP9303, which is an analog signal to PWM signal converter, equivalent to an ADC of a PWM signal output. This chip can linearly convert an analog voltage of 0V to 5V into a PWM signal with a duty cycle of 0% to 100%, and the linear error of the duty cycle is less than 0.5%.

[0111] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0112] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0113] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connection", "connecting" should be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0114] For those skilled in the art, any modification or change made according to the above embodiments of the present application, without departing from the purpose of the present application, shall be included in the protection scope of the present application.

Claims

1. A method of detecting the opening / closing degree of a brake pedal, characterized by, The method comprises the following steps: When the brake pedal is stepped on, the voltage changes, and a voltage signal is generated; When the brake pedal is stepped on, a triangular wave signal is generated; The voltage signal and the triangular wave signal are outputted and amplitude modulated; The amplitude modulated signal is converted into a PWM signal; The PWM signal is outputted to a vehicle body controller, and the stepping depth is identified and recorded according to the duty cycle.

2. The detection method according to claim 1, characterized in that, Before the brake pedal is stepped on, the method further comprises the step of setting a corresponding relationship between the vehicle speed, the stepping depth and the brake distance in the vehicle body controller.

3. The detection method according to claim 2, characterized in that, After the stepping depth is identified according to the duty cycle, the method further comprises the step of judging whether the brake distance of the vehicle at the current vehicle speed and the stepping depth satisfies the corresponding relationship.

4. The detection method according to claim 3, characterized in that, When the brake distance exceeds the maximum value in the corresponding relationship, the user is prompted to maintain the brake system.

5. The method of claim 2, wherein, After the stepping depth is identified according to the duty cycle, the method further comprises the step of judging whether the distance between the vehicle and the front vehicle at the current vehicle speed and the stepping depth satisfies the safe brake distance.

6. The method of claim 1, wherein Before the brake pedal is stepped on, the method further comprises the step of setting the suggested parameter value of the stepping depth under different road conditions in the vehicle body controller in advance.

7. The method of claim 1, wherein Before the brake pedal is stepped on, the method further comprises the step of judging whether the stepping depth detection is started, and if yes, the following steps are executed to generate the corresponding signal when the brake pedal is stepped on; if no, the brake is directly executed.

8. A brake pedal opening detection system comprising a brake pedal, characterized by, The method further comprises a sliding rheostat arranged on the brake pedal, a triangular wave generator connected with the sliding rheostat and a pulse width modulator, and the triangular wave generator and the pulse width modulator are connected with the vehicle body controller. When the brake pedal is stepped on, the triangular wave generator generates a triangular wave, and the sliding end and the fixed end voltage of the sliding rheostat connected with the brake pedal change, and the generated voltage signal and the triangular wave signal are sent to the pulse width modulator for amplitude modulation and converted into a PWM signal, and the position calculation module in the vehicle body controller identifies the stepping depth according to the duty cycle of the PWM signal.

9. The detection system of claim 8, wherein, The triangular wave generator is a digital analog converter or a triangular wave generating chip.

10. The detection system of claim 8, wherein, The triangular wave generator and the pulse width modulator are an integrated chip.

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