Car window anti-pinch processing method and system for recognizing bumpy road surface by using acceleration

Abstract

The invention discloses a car window anti-pinch processing method and system for recognizing a bumpy road surface through acceleration. The system comprises an acquisition module, a filtering module, a judgment module and an execution module. The method comprises the following steps: acquiring acceleration, and fitting into an acceleration-time curve; carrying out filtering processing on the collected acceleration-time curve; judging whether the vehicle enters a bumpy road surface or not according to the filtered acceleration-time curve period; and after the vehicle is identified to enter the bumpy road surface, the anti-pinch inhibition coefficient is increased within the bumpy time, so that the anti-pinch force is increased. The acceleration characteristic of the vehicle running on the bumpy road surface is recognized through the safety air bag controller or other equipment with an acceleration sensor, the acceleration-time curve is collected, it is judged that the vehicle enters the bumpy road surface according to the periodic change of the acceleration-time curve, the state is kept for a certain time, the anti-pinch judgment condition is optimized, and the anti-pinch effect is improved. And the false anti-pinch probability is reduced to the greatest extent under the condition of ensuring that the anti-pinch function is effective in the vehicle driving process.

Description

Technical Field

[0001] The invention relates to the field of automobile window control, and in particular to a window anti-pinch processing method and system for identifying bumpy roads using acceleration. Background Art

[0002] The ripple anti-pinch solution for windows, if the road is bumpy during the automatic rising process of the window, will cause the resistance of the window motor to change and cause the driving current to fluctuate. However, the ripple anti-pinch solution needs to use the motor driving current to determine whether it is anti-pinch, stalled and other working conditions. Therefore, if the anti-pinch judgment logic under static conditions is still used on bumpy roads, it is easy to trigger false anti-pinch. Existing technical solutions usually use the method of judging the vehicle speed to shield the anti-pinch function. If the vehicle speed reaches a certain threshold, the anti-pinch function is directly shielded. Although this can effectively reduce the probability of false anti-pinch, it will also increase the risk of injury from the window, and the vehicle speed has no direct relationship with the fluctuation of the motor driving current. Therefore, a more accurate method can be used to judge the bumpy working condition of the vehicle and optimize the false anti-pinch situation during the bumpy period, such as Figure 1 As shown in the figure, when a vehicle enters a bumpy road, its acceleration value will change dramatically. Summary of the invention

[0003] To solve the above problems, the present invention proposes a window anti-pinch processing method and system that uses acceleration to identify bumpy roads. The acceleration characteristics of bumpy roads are identified through an airbag controller or other equipment with an acceleration sensor, and the anti-pinch judgment conditions are optimized during bumpy roads. The probability of false anti-pinch is minimized while ensuring that the anti-pinch function is effective during vehicle driving.

[0004] The technical solution adopted by the present invention is: a method for preventing vehicle windows from being pinched by using acceleration to identify bumpy roads, the method comprising:

[0005] Collect acceleration and fit it into an acceleration-time curve;

[0006] Filter the collected acceleration-time curve;

[0007] Judging that the vehicle enters a bumpy road based on the acceleration-time curve cycle after filtering;

[0008] After recognizing that the vehicle has entered a bumpy road, the anti-pinch suppression coefficient is increased during the bumpy time, thereby increasing the anti-pinch force.

[0009] According to the above scheme, the filtering process of the collected acceleration-time curve is specifically obtained by the following method:

[0010] The current moment filtered acceleration volt value is obtained by the current moment filtered acceleration volt value minus the current moment filtered acceleration volt value minus the previous moment acceleration volt value multiplied by the filtering coefficient and the previous moment acceleration volt value.

[0011] According to the above scheme, the method of judging whether the vehicle has entered a bumpy road surface based on the acceleration-time curve period after filtering is specifically that when the acceleration change period is less than a preset period, it is judged that the vehicle has entered a bumpy road surface, and it is determined that the time the vehicle remains on the bumpy road surface is not less than a preset time.

[0012] According to the above solution, the change period is obtained by adding the time when the acceleration enters the positive value interval and the time when the acceleration enters the negative value interval.

[0013] According to the above scheme, the acceleration enters the positive value interval specifically as follows: when the acceleration is a negative value, its value increases until it is greater than the hysteresis interval value, and it is judged that the acceleration enters the negative value interval;

[0014] The acceleration entering the negative value interval is specifically: when the acceleration is a positive value, its value decreases until it is less than the negative value of the hysteresis interval value, and it is judged that the acceleration enters the negative value interval;

[0015] The hysteresis interval value is a non-negative number.

[0016] According to the above scheme, the anti-pinch suppression coefficient is obtained by looking up the absolute value of the acceleration voltage value after filtering at the current moment, and the anti-pinch suppression coefficient is proportional to the absolute value.

[0017] According to the above scheme, the relationship between the anti-pinch suppression coefficient and the anti-pinch force is: the anti-pinch force on a bumpy road surface is equal to the product of the anti-pinch force under static conditions of the vehicle and the anti-pinch suppression coefficient.

[0018] A vehicle window anti-pinch processing system for identifying bumpy roads using acceleration, comprising:

[0019] The acquisition module is used to collect acceleration and fit it into an acceleration-time curve;

[0020] A filtering module is used to filter the collected acceleration-time curve;

[0021] A judgment module, used to judge whether the vehicle enters a bumpy road according to the acceleration-time curve cycle after filtering;

[0022] The execution module is used to increase the anti-pinch suppression coefficient during the bumpy time after recognizing that the vehicle enters a bumpy road surface, thereby increasing the anti-pinch force.

[0023] Wherein, the filtering module is specifically used for:

[0024] The current moment filtered acceleration volt value is calculated, wherein the current moment filtered acceleration volt value is obtained by subtracting the acceleration volt value before filtering from the current moment filtered acceleration volt value minus the acceleration volt value at the previous moment, multiplied by the filtering coefficient, and the sum of the acceleration volt value at the previous moment.

[0025] Wherein, the judgment module is specifically used for:

[0026] When the variation period of the acceleration-time curve is less than a preset period, it is determined that the vehicle enters a bumpy road surface, and it is determined that the time the vehicle remains on the bumpy road surface is not less than a preset time.

[0027] The beneficial effect of the present invention is as follows: the present invention proposes to identify the acceleration characteristics of a vehicle when it is traveling on a bumpy road surface through an airbag controller or other equipment equipped with an acceleration sensor and collect an acceleration-time curve, judge that the vehicle has entered a bumpy road surface through the periodic changes of the acceleration-time curve, and maintain this state for a certain period of time, thereby optimizing the anti-pinch judgment conditions and minimizing the probability of false anti-pinch while ensuring that the anti-pinch function is effective during vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the acceleration change of a vehicle driving on a bumpy road;

[0029] Figure 2 A flow chart of a method for preventing vehicle windows from being pinched by using acceleration to identify bumpy roads according to the present invention;

[0030] Figure 3 Schematic diagram of acceleration-time curve before and after X-axis filtering in the embodiment;

[0031] Figure 4 It is a schematic diagram of the acceleration-time curve cycle in the embodiment;

[0032] Figure 5 This is a schematic diagram of the structure of the vehicle window system in the embodiment;

[0033] Figure 6 Schematic diagram of the acceleration of the vehicle along the X-axis and Y-axis in the embodiment.

[0034] In the figure: L1-acceleration-time curve before filtering; L2-acceleration-time curve after filtering. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The present invention provides a method and system for preventing vehicle windows from being pinched by using acceleration to identify bumpy roads. Figure 2 As shown, the method specifically includes:

[0037] S1. Collect acceleration and fit it into an acceleration-time curve.

[0038] By collecting the acceleration signal provided by the vehicle's airbag controller or other equipment with an acceleration sensor and fitting it, an acceleration-time curve with the horizontal axis being time and the vertical axis being acceleration is obtained.

[0039] S2. Filter the collected acceleration-time curve.

[0040] This embodiment takes the X-axis acceleration signal as an example, performs high-pass filtering on the collected acceleration-time curve, amplifies the acceleration signal with a high change rate, weakens the acceleration signal with a low change rate, and centers the curve and moves it to the Y-axis volt value origin of the coordinate system to facilitate the judgment of the curve period.

[0041] Among them, the specific method of filtering processing is:

[0042] AccelerationSignalFilter[x]=AccelerationSignal[x]-((AccelerationSignal[x]-AccelerationSignal[x-1])*FilterCoef+AccelerationSignal[x-1])

[0043] Wherein, AccelerationSignalFilter[x] is the acceleration voltage value after filtering at the current moment; AccelerationSignal[x] is the acceleration voltage value before filtering at the current moment; AccelerationSignal[x-1] is the acceleration voltage value at the previous moment; FilterCoef is the filter coefficient, which is 0.1 in this embodiment.

[0044] The filtering effect is as follows Figure 3 As shown, curve L1 is the acceleration-time curve before filtering, and curve L2 is the acceleration-time curve after filtering.

[0045] S3. Determine whether the vehicle enters a bumpy road according to the acceleration-time curve period after filtering.

[0046] A hysteresis interval value Hyst for judging the positive and negative intervals of acceleration is set, where Hyst is a non-negative number. In this embodiment, Hyst=0.3g, where g is the acceleration due to gravity.

[0047] like Figure 4 As shown, when the acceleration is positive, its value decreases until it is less than -Hyst, and it is judged that the acceleration enters the negative value interval; the time of entering the negative value interval is counted and recorded as T1;

[0048] When the acceleration is negative, its value increases until it is greater than +Hyst, and it is judged that the acceleration enters the positive interval; the time of entering the positive interval is counted and recorded as T2;

[0049] Then the acceleration change period T is: T = T1 + T2;

[0050] When the acceleration change cycle is less than the preset cycle, it is determined that the vehicle has entered a bumpy road, and it is determined that the time the vehicle remains on the bumpy road is not less than the preset time; in this embodiment, the preset cycle is set to 200ms, and the preset time is set to 10s. The preset values ​​in the embodiment can also be adjusted according to actual system requirements.

[0051] S4: After recognizing that the vehicle enters a bumpy road, the anti-pinch suppression coefficient is increased during the bumpy time, thereby increasing the anti-pinch force.

[0052] After the vehicle is identified to have entered a bumpy road, it is determined that the vehicle has remained on the bumpy road for a certain period of time, and the anti-pinch suppression coefficient of the vehicle is increased during this state time. The anti-pinch suppression coefficient can be obtained by looking up the absolute value of the acceleration voltage value after filtering at the current moment, and the anti-pinch suppression coefficient is proportional to the absolute value of the acceleration voltage value after filtering at the current moment.

[0053] The specific relationship between the anti-pinch suppression coefficient and the window anti-pinch force is:

[0054] WindowAntiPinchForce=StaticAntiPinchForce*AntiPinchSuppressionCoef

[0055] Among them, WindowAntiPinchForce is the anti-pinch force of the window when the vehicle is driving on a bumpy road; StaticAntiPinchForce is the anti-pinch force of the window under static conditions; AntiPinchSuppressionCoef is the anti-pinch suppression coefficient.

[0056] Therefore, it can be seen from the relationship that as the anti-pinch suppression coefficient increases, the window anti-pinch force increases accordingly; during vehicle driving, when the running resistance of the window motor is greater than the window anti-pinch force, the vehicle's anti-pinch function is triggered, and the increase in the window anti-pinch force increases the running resistance of the window motor required to trigger the anti-pinch function, reducing the probability of false anti-pinch; when the vehicle leaves the bumpy road, the anti-pinch suppression coefficient returns to the coefficient size under the vehicle's static operating conditions.

[0057] At the same time, in order to implement the above solution, the present invention also provides a window anti-pinch processing system for identifying bumpy roads using acceleration, comprising:

[0058] The acquisition module is used to collect acceleration and fit it into an acceleration-time curve;

[0059] A filtering module is used to filter the collected acceleration-time curve;

[0060] A judgment module, used to judge whether the vehicle enters a bumpy road according to the acceleration-time curve cycle after filtering;

[0061] The execution module is used to increase the anti-pinch suppression coefficient during the bumpy time after recognizing that the vehicle enters a bumpy road surface, thereby increasing the anti-pinch force.

[0062] Among them, the filtering module is specifically used to calculate the acceleration volt value after filtering at the current moment. The specific calculation method is that the acceleration volt value after filtering at the current moment is equal to the acceleration volt value before filtering at the current moment, minus the acceleration volt value before filtering at the current moment minus the acceleration volt value at the previous moment, multiplied by the filtering coefficient and the sum of the acceleration volt value at the previous moment.

[0063] The judgment module is specifically used to judge whether the vehicle enters a bumpy road. When the change period of the acceleration-time curve is less than a preset period, it is judged that the vehicle enters a bumpy road, and it is determined that the time the vehicle stays on the bumpy road is not less than a preset time; the change period is specifically the sum of the time when the acceleration enters the positive value interval and the time when the acceleration enters the negative value interval.

[0064] Meanwhile, the window structure used in this embodiment is as follows Figure 5 As shown, it includes a window motor, a motor drive, a window and environmental parts, a door / body, and an airbag controller; wherein the window motor is powered by the motor drive and realizes forward and reverse rotation; the window motor generates motor current and feeds back to the motor drive; the window and environmental parts are driven to rise and fall by the window motor, and there is resistance to the operation of the window motor during the rising and falling process of the window and environmental parts. When the vehicle is driving on a bumpy road, there is a vertical acceleration change in the door / body and the window and environmental parts, which affects the operation resistance of the window motor; the acceleration signal required to judge the acceleration-time curve period is provided by the airbag controller.

[0065] Due to the current passenger car safety standards, all vehicles are equipped with airbag controllers, and the input for the controller to judge collisions comes from its own highly sensitive acceleration sensor chip. When the vehicle is driving, the airbag controller can obtain acceleration signals in the vehicle signal network, generally the acceleration of the X (lateral) and Y (longitudinal) axes, such as Figure 6As shown. Although the acceleration change of the Z (vertical direction) axis directly affects the running resistance of the window motor on a bumpy road, it will inevitably affect the acceleration of the X and Y axes under this condition. When the vehicle is driving on a bumpy road, the acceleration signals of the X and Y axes will change, and the change cycle of the acceleration signal will become shorter. Therefore, it is possible to determine whether the vehicle has entered a bumpy road by collecting the change cycle of the acceleration-time curve obtained by collecting the acceleration signal provided by the airbag controller. After identifying that the vehicle has entered a bumpy road, the anti-pinch function can be processed.

[0066] Meanwhile, in addition to the airbag controller used in this embodiment, other devices equipped with acceleration sensors may also be used to provide acceleration signals.

[0067] This embodiment proposes to use an airbag controller or other equipment equipped with an acceleration sensor to identify the acceleration characteristics of a vehicle when it is traveling on a bumpy road and collect an acceleration-time curve. It is judged through the periodic changes of the acceleration-time curve that the vehicle has entered a bumpy road and this state is maintained for a certain period of time, thereby optimizing the anti-pinch judgment conditions and minimizing the probability of false anti-pinch while ensuring that the anti-pinch function is effective during vehicle driving.

[0068] The present invention can be applied to various types of vehicles, especially off-road vehicles.

[0069] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for preventing vehicle windows from being pinched by using acceleration to identify bumpy roads, characterized in that: The method includes: Collect acceleration and fit it into an acceleration-time curve; Filter the collected acceleration-time curve; Judging that the vehicle enters a bumpy road based on the acceleration-time curve cycle after filtering; After recognizing that the vehicle has entered a bumpy road, the anti-pinch suppression coefficient is increased during the bumpy time, thereby increasing the anti-pinch force.

2. A window anti-pinch and treatment method for using acceleration to identify bumpy roads according to claim 1, characterized in that: The filtering process of the collected acceleration-time curve is specifically obtained by the following method: The current moment filtered acceleration volt value is obtained by the current moment filtered acceleration volt value minus the current moment filtered acceleration volt value minus the previous moment acceleration volt value multiplied by the filtering coefficient and the previous moment acceleration volt value.

3. The method for preventing and treating vehicle windows by using acceleration to identify bumpy roads according to claim 1, characterized in that: The method of judging whether the vehicle enters a bumpy road according to the acceleration-time curve cycle after filtering is specifically as follows: When the variation period of the acceleration-time curve is less than a preset period, it is determined that the vehicle enters a bumpy road surface, and it is determined that the time the vehicle remains on the bumpy road surface is not less than a preset time.

4. The method for preventing and treating vehicle windows by using acceleration to identify bumpy roads according to claim 3, characterized in that: The variation period is obtained by adding the time when the acceleration enters the positive value interval and the time when the acceleration enters the negative value interval.

5. The method for preventing and treating vehicle windows by using acceleration to identify bumpy roads according to claim 4, characterized in that: The acceleration entering the positive range is specifically: When the acceleration is negative, its value increases until it is greater than the hysteresis interval value, and it is judged that the acceleration enters the negative value interval; The acceleration entering the negative range is specifically: When the acceleration is positive, its value decreases until it is less than the negative value of the hysteresis interval value, and it is judged that the acceleration enters the negative value interval; The hysteresis interval value is a non-negative number.

6. The method for preventing and treating vehicle windows from being pinched by using acceleration to identify bumpy roads according to claim 1, characterized in that: The anti-pinch suppression coefficient is obtained by looking up the table and calibrating the absolute value of the acceleration volt value after filtering at the current moment, and the anti-pinch suppression coefficient is proportional to the absolute value.

7. The method for preventing and treating vehicle windows from being pinched by using acceleration to identify bumpy roads according to claim 1, characterized in that: The relationship between the anti-pinch suppression coefficient and the anti-pinch force is: the anti-pinch force on a bumpy road surface is equal to the product of the anti-pinch force under a static working condition of the vehicle and the anti-pinch suppression coefficient.

8. A window anti-pinch processing system using acceleration to identify bumpy roads, characterized in that: include: The acquisition module is used to collect acceleration and fit it into an acceleration-time curve; A filtering module is used to filter the collected acceleration-time curve; A judgment module, used to judge whether the vehicle enters a bumpy road according to the acceleration-time curve cycle after filtering; The execution module is used to increase the anti-pinch suppression coefficient during the bumpy time after recognizing that the vehicle enters a bumpy road surface, thereby increasing the anti-pinch force.

9. A vehicle window anti-pinch processing system for identifying bumpy roads using acceleration according to claim 8, characterized in that: The filtering module is specifically used for: The current moment filtered acceleration volt value is calculated, wherein the current moment filtered acceleration volt value is obtained by subtracting the acceleration volt value before filtering from the current moment filtered acceleration volt value minus the acceleration volt value at the previous moment, multiplied by the filtering coefficient, and the sum of the acceleration volt value at the previous moment.

10. The vehicle window anti-pinch processing system for identifying bumpy roads using acceleration according to claim 8, characterized in that: The judgment module is specifically used for: When the variation period of the acceleration-time curve is less than a preset period, it is determined that the vehicle enters a bumpy road surface, and it is determined that the time the vehicle remains on the bumpy road surface is not less than a preset time.

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