Accelerator pedal clamping stagnation judgment and fault processing method

Abstract

The invention provides an accelerator pedal clamping stagnation judgment and fault processing method, and relates to the field of new energy automobile power system software design. Pedal clamping stagnation judgment logic is added, and when the clamping stagnation problem occurs, the output opening degree of the accelerator pedal can be reduced to zero; the opening degree of the accelerator pedal can be normally output when the clamping stagnation is relieved; according to the method, the brake pedal is introduced to confirm the clamping stagnation judgment logic, the stepping sequence of the brake pedal and the accelerator pedal is considered, and judgment of the clamping stagnation situation is prevented from being triggered by mistake; by means of the clamping stagnation point initialization algorithm, the problem that the opening degree of the accelerator pedal is directly output when the pedal is clamped before power-on is solved.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle power system software design. Specifically, it relates to a method for judging acceleration pedal jamming and handling faults. Background Art

[0002] Generally, two-way sensors are used for the acceleration pedal. The opening percentage is calculated based on the supply voltage and the sensor voltage, and then combined with minimum position self-learning, filtering, dead zone, hysteresis and other processing to ensure good consistency and anti-shake performance of the acceleration pedal opening. The two-way acceleration pedal sensors are independently powered and diagnosed. When both are normal, 50% of the ratio can be taken from each or the one with the smaller opening can be taken as the output. When one of them fails (such as a short circuit), the opening calculation can rely on the other one, which not only reduces the probability of the acceleration pedal completely failing, but also eliminates the influence of the failed sensor on the opening calculation; However, this cannot solve the problem of acceleration pedal jamming caused by physical or electrical reasons, such as improper position of the floor mat resulting in the pedal not being able to be fully released, mechanical problems of the acceleration pedal return spring resulting in the position not being able to return to zero, and the sensor voltage not changing with the pedal position. If jamming occurs before power-on, after starting the vehicle, shifting into gear and releasing the brake, the vehicle may rush out directly. If jamming occurs during driving, after the driver's foot leaves the acceleration pedal, the vehicle cannot decelerate as expected or even maintains acceleration, which will pose serious safety hazards to drivers, pedestrians and other vehicles. Therefore, we make improvements in this regard and propose a method for judging acceleration pedal jamming and handling faults. Summary of the Invention

[0003] The purpose of the present invention is to address the problem that currently, if jamming occurs during driving, after the driver releases the acceleration pedal, the vehicle cannot decelerate as expected or even maintains acceleration. These situations will pose serious safety hazards to drivers, pedestrians and other vehicles.

[0004] To achieve the above-mentioned invention purpose, the present invention provides a method for judging acceleration pedal jamming and handling faults to improve the above problems.

[0005] Specifically, this application is as follows: A method for judging acceleration pedal jamming and handling faults includes: Based on the two independently calculated acceleration pedal openings AccPos1 and AccPos2, the acceleration pedal opening AccWgtPos obtained after weighted arbitration of the diagnostic results is used as the input for jamming judgment; Define the pedal jamming point AccStkPos as the AccWgtPos value when the pedal is fully released. The finally output acceleration pedal opening AccPosOut is calculated by the following formula: AccPosOut = max(AccWgtPos - AccStkPos, 0).

[0006] As a preferred technical solution of this application, the pedal sticking point AccStkPos is normally 0% under normal circumstances, indicating that no sticking problem occurs, and the output opening is AccWgtPos.

[0007] As a preferred technical solution of this application, the initial value of the sticking point AccStkPos is not less than 100%, and it continuously takes the smaller value with the AccWgtPos calculated by the previous logic to update AccStkPos.

[0008] As a preferred technical solution of this application, if there is no sticking before power-on, after power-on, the opening calculated by AccWgtPos is equal to 0%, AccStkPos is immediately updated from the initial value of 100% to 0%, and after the driver steps on the accelerator pedal, the output value is equal to AccWgtPos.

[0009] As a preferred technical solution of this application, if there is sticking before power-on, after power-on, AccWgtPos calculates the opening, and AccStkPos is updated from the initial value of 100% to the calculated opening, and the pedal opening above the sticking point is used as the output.

[0010] As a preferred technical solution of this application, the judgment conditions for the sticking condition are as follows: The accelerator pedal opening is stable, which means that the range of up and down fluctuations is equivalent to the electrical noise of the sensor. The judgment algorithm performs a rolling filter calculation on AccWgtPos to calculate its average value, and then compares the difference between AccWgtPos at the current moment and its average value. If the difference is very small and lasts for a period of time, it is considered that the stable condition is established.

[0011] As a preferred technical solution of this application, the judgment conditions for the sticking condition also include: When the brake pedal is stepped on with the accelerator pedal opening, in order to prevent the stable accelerator pedal from being misjudged as sticking during normal driving, it is judged in combination with the brake pedal. Only when the driver steps on the brake can it be judged as sticking, and there is a sequence between the accelerator pedal and the brake pedal to prevent misjudgment as sticking when the driver steps on the deep brake first and then steps on the accelerator during a catapult start or a start on a large slope.

[0012] As a preferred technical solution of this application, when the sticking condition is met, AccStkPos transitions to the rolling average value of AccWgtPos at a certain slope, so that the output opening gradually decreases. When AccStkPos reaches the rolling average value of AccWgtPos, the output opening drops to 0%. If the driver steps on the accelerator pedal deeply, the pedal opening above the sticking point is used as the output.

[0013] As a preferred technical solution of the present application, for the release of pedal jamming, when AccWgtPos changes and is less than AccStkPos, it indicates that the opening of the accelerator pedal can return to a smaller position. Take the smaller value of AccStkPos and AccWgtPos and follow it to decrease, releasing the jamming. As a preferred technical solution of the present application, after releasing the jamming and stepping on the accelerator pedal again, the opening is normally output.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In the solution of the present application: The present invention adds a pedal jamming judgment logic. When a jamming problem occurs, the output opening of the accelerator pedal can be reduced to zero; and when the jamming is released, the opening of the accelerator pedal can be normally output. The present invention introduces the brake pedal to confirm the jamming judgment logic and considers the order of stepping on the brake pedal and the accelerator pedal to prevent misjudgment of the jamming situation. The present invention solves the problem of directly outputting the opening of the accelerator pedal when pedal jamming has occurred before power-on through a jamming point initialization algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a curve graph of AccPos1 and AccPos2 of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 2 It is a curve graph of AccWgtPos of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 3 It is a curve graph of AccWgtPos and AccPosOut of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 4 It is a curve graph of AccWgtPos, AccPosOut and AccStkPos of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 5 It is a curve graph of the occurrence of jamming of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 6 It is a curve graph of the release of jamming of the method for judging accelerator pedal jamming and fault handling provided by the present application; Figure 7 It is a flowchart of the method for judging accelerator pedal jamming and fault handling provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0017] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0018] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0019] Embodiment 1, as Figure 7 shown, a method for judging and handling the jam of an accelerator pedal includes: Based on the accelerator pedal opening degrees AccPos1 and AccPos2 calculated independently in two paths (as Figure 1 ), the accelerator pedal opening degree AccWgtPos obtained after weighted arbitration of the diagnostic results (as Figure 2 ), which is used as the input for jam judgment; Define the pedal jam point AccStkPos as the AccWgtPos value when the pedal is fully released. The finally output accelerator pedal opening degree AccPosOut is calculated by the following formula: AccPosOut = max(AccWgtPos - AccStkPos, 0).

[0020] Furthermore, the pedal jam point AccStkPos is normally 0%, indicating that no jam problem occurs, and the output opening degree is AccWgtPos. To prevent the pedal from jamming before the vehicle is powered on and started, resulting in the output of the accelerator pedal opening degree when the driver does not step on the accelerator.

[0021] Furthermore, the initial value of the jam point AccStkPos is not less than 100%, and it continuously takes the smaller value with the AccWgtPos calculated by the previous logic, that is, to find the minimum value of the accelerator pedal opening degree after this power-on, and use it to update AccStkPos.

[0022] Embodiment 2 further optimizes the method for judging and handling the accelerator pedal jamming provided in Embodiment 1. Specifically, if there is no jamming before power-on, the opening calculated by AccWgtPos after power-on is equal to 0%, and AccStkPos is immediately updated from the initial value of 100% to 0%. After the driver steps on the accelerator, the output value is equal to AccWgtPos (such as Figure 3 ).

[0023] Furthermore, if there has been jamming before power-on, the opening calculated by AccWgtPos after power-on (for example, 25%) is obtained, and AccStkPos is updated from the initial value of 100% to the calculated opening (for example, 25%). The pedal opening above the jamming point is used as the output. For example, when AccWgtPos is equal to 60% after the driver steps on the accelerator, the actual output opening is only 35% (such as Figure 4 ).

[0024] Embodiment 3 further optimizes the method for judging and handling the accelerator pedal jamming provided in Embodiment 1 or 2. Specifically, when a jamming problem occurs during driving, after the driver completely releases the pedal, the opening cannot return to 0% as before, and there is still a certain opening output, which brings safety risks. The judgment conditions for the jamming condition are as follows: The accelerator pedal opening is stable, which means the range of up and down fluctuations is equivalent to the sensor electrical noise. The judgment algorithm performs a rolling filter calculation on AccWgtPos to calculate its average value, and then compares the difference between AccWgtPos at the current moment and its average value. If the difference is very small and lasts for a certain period of time, it is considered that the stable condition is established.

[0025] Furthermore, the judgment conditions for the jamming condition also include: When the brake pedal is stepped on with the accelerator pedal opening, in order to prevent the stable accelerator pedal from being misjudged as jammed during normal driving, the brake pedal is combined for judgment. Only when the driver steps on the brake can it be judged as jammed, and there is a sequence between the accelerator pedal and the brake pedal to prevent misjudgment when the driver steps on the deep brake first and then steps on the accelerator during a catapult start or a start on a large slope.

[0026] Furthermore, when the jamming condition is met, AccStkPos transitions to the rolling average value of AccWgtPos at a certain slope, so that the output opening gradually decreases. When AccStkPos reaches the rolling average value of AccWgtPos, the output opening drops to 0%. If the driver steps on the accelerator pedal deeply, the pedal opening above the jamming point is used as the output (such as Figure 5 ).

[0027] Further, for the release of the pedal jamming, when AccWgtPos changes and is less than AccStkPos, it indicates that the accelerator pedal opening can return to a smaller position. Take the smaller value between AccStkPos and AccWgtPos and follow its decrease to release the jamming.

[0028] Further, after releasing the jamming and pressing the accelerator pedal again, the opening is normally output (such as Figure 6 ).

[0029] The usage process of the method for judging accelerator pedal jamming and fault handling provided by the present invention is as follows: Set the initial value of the jamming point AccStkPos to 100% to ensure that the accelerator pedal opening output in the first Step after power-on is zero; Continuously take the smaller value between the jamming point and the input value AccWgtPos for update to obtain the minimum value of the accelerator pedal opening after this power-on; Use the input value minus the jamming point value to obtain the final accelerator pedal opening output: AccPosOut = max(AccWgtPos - AccStkPos, 0); When the accelerator pedal input value is non-zero and stable without change, and then the brake is pressed, confirm that it is judged as a jamming fault after a period of time. The jamming point AccStkPos gradually transitions from the current value to the input value AccWgtPos, so that the final output opening will be zero; After the driver presses the accelerator pedal again, the input opening greater than the jamming point will be output to drive the vehicle; When the jamming is released and the driver releases the accelerator pedal, the input opening AccWgtPos can return to zero, and the jamming point AccStkPos also returns to zero following the smaller value of its value, so that the opening can be normally output when the accelerator pedal is pressed next time.

[0030] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is similarly within the scope of the patent protection of the present invention.

Claims

1. A method for judging and troubleshooting accelerator pedal sticking, characterized in that: include: Based on the accelerator pedal openings AccPos1 and AccPos2 calculated independently, the accelerator pedal opening AccWgtPos is obtained after weighted arbitration of the diagnosis results and is used as the input for the stuck judgment; The pedal sticking point AccStkPos is defined as the value of AccWgtPos when the pedal is fully released. The final output accelerator pedal opening AccPosOut is calculated by the following formula: AccPosOut=max(AccWgtPos-AccStkPos, 0).

2. The method for determining and troubleshooting an accelerator pedal stuck condition according to claim 1, characterized in that: The pedal sticking point AccStkPos is normally 0%, indicating that there is no sticking problem, and the output opening is AccWgtPos.

3. The method for determining and troubleshooting an accelerator pedal stuck condition according to claim 2, characterized in that: The initial value of the stuck point AccStkPos is not less than 100%, and is then continuously reduced by the AccWgtPos calculated by the preceding logic to update AccStkPos.

4. The method for determining and troubleshooting an accelerator pedal stuck condition according to claim 3, characterized in that: If there is no jamming before power-on, the opening calculated by AccWgtPos is equal to 0% after power-on, and AccStkPos is immediately updated from the initial value 100% to 0%. After the driver steps on the accelerator, the output value is equal to AccWgtPos.

5. The method for determining and troubleshooting an accelerator pedal stuck condition according to claim 4, characterized in that: If a jam has occurred before power-on, AccWgtPos calculates the opening after power-on, and AccStkPos is updated from the initial value 100% to the calculated opening, with the pedal opening above the jam point being output.

6. The method for determining and troubleshooting accelerator pedal sticking according to claim 5, characterized in that: The judgment conditions for the stuck condition are as follows: The accelerator pedal opening is stable, which means that the range of up and down fluctuations is equivalent to the electrical noise of the sensor. The judgment algorithm performs rolling filtering on AccWgtPos to calculate its average value, and then compares the difference between AccWgtPos at the current moment and its average value. If the difference is very small and lasts for a period of time, it is considered that the stable condition is met.

7. The method for determining and troubleshooting an accelerator pedal stuck condition according to claim 6, characterized in that: The judgment conditions for the stuck condition also include: When the brake pedal is pressed while the accelerator pedal is open, in order to prevent the accelerator pedal from being misjudged as stuck when it is stable during normal driving, it is judged in combination with the brake pedal. Only when the driver steps on the brake can it be judged as stuck. The accelerator pedal and the brake pedal have a sequence to prevent the driver from stepping on the brake deeply first and then accelerating during launch start or starting on a steep slope, which is misjudged as stuck.

8. The method for determining and troubleshooting accelerator pedal sticking according to claim 7, characterized in that: When the sticking condition is met, AccStkPos transitions to the rolling mean of AccWgtPos with a certain slope, so that the output opening gradually decreases. When AccStkPos reaches the rolling mean of AccWgtPos, the output opening drops to 0%. If the driver presses the accelerator pedal deeply, the pedal opening above the sticking point is used as the output.

9. The method for determining and troubleshooting accelerator pedal sticking according to claim 8, characterized in that: To release the stuck pedal, when AccWgtPos changes and is less than AccStkPos, it means that the accelerator pedal opening can return to a smaller position. The smaller of AccStkPos and AccWgtPos is taken, and the pedal is released from the stuck position by decreasing accordingly.

10. The method for judging and handling accelerator pedal sticking according to claim 9, characterized in that: After the hysteresis is released and the accelerator pedal is pressed again, the opening is output normally.

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