Self-adaptive calibration control method for gear sensor

Abstract

The invention discloses a self-adaptive calibration control method for a gear sensor. The method comprises the following steps: carrying out anomaly detection on the function of the gear sensor; if the function detection of the gear sensor is abnormal, the electronic gear shifting actuator control unit prompts to carry out self-adaptive calibration of the gear sensor; and the electronic gear shifting control unit is used for carrying out self-adaptive calibration on the gear sensor. According to the gear sensor self-adaptive calibration control method, when the sensor calibration data is abnormal, a driver is reminded of parking, self-adaptive calibration is started, all gear positions are calibrated again, the driver does not need to drive a vehicle to an after-sale site for initialization calibration, and after self-adaptive calibration, the calibration result is the same as the initialization calibration result.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and more specifically, to a gear position sensor adaptive calibration control method. Background Art

[0002] The gear sensor inside the electronic shift actuator will be initialized and calibrated after it rolls off the supplier's production line, mainly for the sensor signal corresponding to each gear position when the gear sensor is matched with the shift mechanical mechanism.

[0003] Due to the mechanical matching between the electronic shift actuator and the gearbox and the manufacturing process, there is a certain gap between the shift shaft of the actuator and the gearbox. After the vehicle has traveled a certain mileage (30,000 or 50,000 kilometers), the shaking amount will increase, which may cause the problem of misalignment of the position matching accuracy of the gear sensor. The phenomenon manifested is that the gearbox cannot shift gears when the vehicle control system functions normally. To avoid the above problems, the existing scheme is as follows: through the durability test of components, find the relevant parameters when the matching accuracy is misaligned. If the above problems may occur after the vehicle has traveled 50,000 kilometers, it is noted in the after-sales manual that after 50,000 kilometers, the after-sales staff will perform the initialization and calibration action. This scheme requires the driver to drive the vehicle to the after-sales site before it can be carried out. The driver cannot operate it by himself, and it is more troublesome to implement. If the driver has reached the mileage but has not gone to the store for initialization and calibration, the vehicle will be at risk of shift failure at any time.

[0004] Therefore, there is an urgent need for an adaptive calibration control method for a gear sensor. Summary of the invention

[0005] The object of the present invention is to provide a gear position sensor adaptive calibration control method to solve the above-mentioned problems in the prior art and to achieve adaptive calibration of the gear position sensor.

[0006] The present invention provides a gear position sensor adaptive calibration control method, which includes:

[0007] Perform abnormal detection on the function of the gear position sensor;

[0008] If the gear position sensor function detection is abnormal, the electronic shift actuator control unit prompts to perform gear position sensor adaptive calibration;

[0009] The gear position sensor is adaptively calibrated using the electronic gear shift control unit.

[0010] In the above-mentioned adaptive calibration control method for the gear position sensor, preferably, the abnormality detection of the function of the gear position sensor specifically includes:

[0011] After the driver operates the shift lever to the target position, if the preset time threshold is exceeded and the transmission control unit still does not receive the shift execution completion and target gear position signal fed back by the electronic shift actuator, a gear position sensor abnormality is recorded and accumulated;

[0012] If the number of times the gear position sensor is abnormal exceeds the abnormal number threshold, it is determined that the gear position sensor is malfunctioning.

[0013] In the above-mentioned adaptive calibration control method for the gear position sensor, preferably, the preset time threshold is 300 ms, and the abnormal number threshold is 3 times.

[0014] The gear position sensor adaptive calibration control method as described above, wherein preferably, in the case of abnormal gear position sensor function detection, the electronic shift actuator control unit prompts to perform gear position sensor adaptive calibration, specifically comprising:

[0015] The electronic shift actuator control unit prompts the driver to stop the car and shift to P gear through the instrument panel and performs adaptive calibration of the gear position sensor.

[0016] In the above-mentioned gear position sensor adaptive calibration control method, preferably, the adaptive calibration of the gear position sensor using the electronic shift control unit specifically includes:

[0017] The electronic shift actuator control unit sends a self-learning instruction to the gear position sensor;

[0018] The electronic shift actuator control unit drives the shift actuator to rotate clockwise until it cannot rotate any more;

[0019] The electronic shift actuator control unit sends a command to exit the P gear to drive the electronic shift actuator to rotate counterclockwise;

[0020] The first driving force valley point is recorded as the P gear position;

[0021] The second driving force valley point position is recorded as the R gear position;

[0022] The third driving force valley point position is recorded as the N gear position;

[0023] The fourth driving force valley point position is recorded as the D gear position.

[0024] As described above, the gear position sensor adaptive calibration control method, wherein preferably, the gear position sensor adaptive calibration control method further comprises:

[0025] After the gear position sensor adaptive calibration is completed, determine whether the calibration is successful.

[0026] In the above-mentioned gear position sensor adaptive calibration control method, preferably, after the gear position sensor adaptive calibration is completed, determining whether the calibration is successful specifically includes:

[0027] The electronic shift actuator controller calculates the angle difference between each gear position, namely, P, R, N and D;

[0028] If the angle difference meets the design requirements, the calibration is considered successful;

[0029] If the angle difference exceeds the corresponding angle difference design threshold, the calibration is considered to have failed and adaptive calibration needs to be performed again;

[0030] If the calibration fails even after exceeding the preset calibration times threshold, the calibration status of the gear position sensor is determined to be abnormal, and the driver is prompted to go to an after-sales service shop for repair.

[0031] In the above-mentioned gear position sensor adaptive calibration control method, preferably, the gear position judgment principle of the gear position sensor in the middle of each gear position is:

[0032] In the case of slow operation, the gear sensor can detect the gear signal. If the current gear is P gear, the gear signal is P gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters D gear; if the current gear is D gear, the gear signal is D gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters P gear;

[0033] In the case of rapid operation, the gear sensor may lose signal. If the current gear is P, when the driver quickly operates to the middle position from R to N, the sensor may lose the R signal, and the gear signal output is R. If the driver continuously operates from P to D, the gear signal must output P, ​​R, N, and D signals in sequence.

[0034] The present invention provides a gear position sensor adaptive calibration control method. When sensor calibration data abnormality occurs, the driver is reminded to stop the vehicle, and adaptive calibration is started to recalibrate each gear position. The driver does not need to drive the vehicle to an after-sales site for initialization calibration. After the adaptive calibration, the calibration result is the same as the initialization calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0036] Figure 1 A flow chart of an embodiment of a gear position sensor adaptive calibration control method provided by the present invention;

[0037] Figure 2 is a timing diagram of the shifting process of the present invention;

[0038] Figure 3 It is the flow chart of adaptive calibration of gear position sensor;

[0039] Figure 4 Schematic diagram of the signal processing strategy for the intermediate position of each gear. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0041] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0043] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0045] like Figure 1 As shown, the gear position sensor adaptive calibration control method provided in this embodiment includes the following steps in actual execution:

[0046] Step S1, performing abnormality detection on the function of the gear position sensor.

[0047] In one implementation of the gear position sensor adaptive calibration control method of the present invention, step S1 may specifically include:

[0048] Step S11: After the driver operates the shift lever to enter the target position, if the preset time threshold is exceeded and the transmission control unit still does not receive the shift execution completion and target gear position signals fed back by the electronic shift actuator, a gear position sensor abnormality is recorded and accumulated.

[0049] Exemplarily, in one embodiment of the present invention, the preset time threshold is 300ms. Figure 2 As shown in the figure, after the driver operates the shift lever to enter the target position, it takes 36ms to go through signal detection and filtering (16s), interrupt processing and shift logic detection (10s), and then send a shift request through the CAN signal (10s). The electronic shift actuator receives the shift lever's gear request signal (10s), then goes through interrupt processing (5s), and drives the shift shaft to enter the corresponding gear (200ms under normal conditions and 350ms under full load). o The slope is 500ms), and at least 215ms is needed in total. Therefore, under normal working conditions, the gear sensor can detect the target gear signal after 251ms (36 ms +215ms), and then go through sensor position feedback and filtering (16ms), and finally send it through the CAN signal (10ms). The total process takes 277ms (251ms +16ms +10ms). Therefore, the control logic designed by the present invention determines that if the transmission control unit TCU still does not receive the gear shift execution completion and target gear signal fed back by the electronic shift actuator after 300ms, then a gear sensor abnormality is recorded.

[0050] Step S12: If the number of abnormalities of the gear position sensor exceeds the abnormality number threshold, it is determined that the function of the gear position sensor is abnormal.

[0051] Exemplarily, in one embodiment of the present invention, the abnormal number threshold is 3 times.

[0052] Step S2: If the gear position sensor function detection is abnormal, the electronic shift actuator control unit prompts to perform gear position sensor adaptive calibration.

[0053] Specifically, when the gear position sensor function detects an abnormality, the electronic shift actuator control unit prompts the driver to stop the car and shift to P gear through the instrument panel, and performs adaptive calibration of the gear position sensor.

[0054] Specifically, if the gear position sensor is abnormal for three consecutive times, the electronic shift control unit will send an adaptive calibration request prompt message to the instrument, prompting the driver to stop the car and shift the gear to P gear, waiting for the gear position sensor to be recalibrated. As mentioned above, after the driver operates the shift lever to enter the target position, the electronic shift actuator control unit needs to send a target gear position signal and a shift completion status signal after 277ms (under normal conditions). Therefore, the control algorithm is set to send a target gear position signal and a gear shift completion status signal after 300ms. If the target gear position signal is not fed back normally after 300ms, the sensor abnormal value +1, and the abnormal value reaches more than 3 times, it is judged that the sensor needs to be recalibrated.

[0055] Step S3: using the electronic shift control unit to adaptively calibrate the gear position sensor.

[0056] like Figure 3 As shown, in one implementation of the gear position sensor adaptive calibration control method of the present invention, step S3 may specifically include:

[0057] Step S31: The electronic shift actuator control unit sends a self-learning instruction to the gear position sensor.

[0058] Step S32: The electronic shift actuator control unit drives the shift actuator to rotate clockwise until it cannot rotate anymore.

[0059] Step S33: the electronic shift actuator control unit sends an exit P gear instruction to drive the electronic shift actuator to rotate counterclockwise.

[0060] Step S34, recording the first driving force valley point position as the P gear position.

[0061] Step S35, recording the second driving force valley point position as the R gear position.

[0062] Step S36: record the third driving force valley point position as the N gear position.

[0063] Step S37: record the fourth driving force valley point position as the D gear position.

[0064] Furthermore, in some embodiments of the present invention, the gear position sensor adaptive calibration control method further includes:

[0065] Step S4: After the gear position sensor adaptive calibration is completed, determine whether the calibration is successful.

[0066] In one implementation of the gear position sensor adaptive calibration control method of the present invention, step S4 may specifically include:

[0067] Step S41: The electronic shift actuator controller calculates the angle difference between the P gear, the R gear, the N gear and the D gear.

[0068] Step S42: If the angle difference meets the design requirements, the calibration is determined to be successful.

[0069] Step S43: If the angle difference exceeds the corresponding angle difference design threshold, it is determined that the calibration has failed and adaptive calibration needs to be performed again.

[0070] Step S44: If the calibration times exceed the preset threshold and still fail, it is determined that the calibration state of the gear position sensor is abnormal, and the driver is prompted to go to an after-sales service store for repair.

[0071] Exemplarily, the preset calibration times threshold is 5. In a specific implementation, the electronic shift control unit prompts the driver through the instrument panel that the driver needs to go to an after-sales service shop for repair.

[0072] Furthermore, if Figure 4 As shown in the figure, during the process of adaptive calibration and determining whether the calibration is successful, the gear position judgment principle of the gear position sensor in the middle of each gear position is:

[0073] In the case of slow operation, the gear sensor can detect the gear signal. If the current gear is P gear, the gear signal is P gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters D gear; if the current gear is D gear, the gear signal is D gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters P gear;

[0074] In the case of rapid operation, the gear sensor may lose signal. If the current gear is P, when the driver quickly operates to the middle position from R→N, the sensor may lose the R signal, and the gear signal output is R. If the driver continuously operates from P to D, the gear signal must output P, ​​R, N, and D signals in sequence, and so on.

[0075] The gear sensor adaptive calibration control method provided in the embodiment of the present invention reminds the driver to stop the vehicle and starts adaptive calibration to recalibrate each gear position when abnormal sensor calibration data occurs. The driver does not need to drive the vehicle to the after-sales site for initialization calibration. After the adaptive calibration, the calibration result is the same as the initialization calibration.

[0076] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0077] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A gear position sensor adaptive calibration control method, characterized in that: include: Perform abnormal detection on the function of the gear position sensor; If the gear position sensor function detection is abnormal, the electronic shift actuator control unit prompts to perform gear position sensor adaptive calibration; The gear position sensor is adaptively calibrated using the electronic gear shift control unit.

2. The gear position sensor adaptive calibration control method according to claim 1, characterized in that: The abnormality detection of the function of the gear position sensor specifically includes: After the driver operates the shift lever to the target position, if the preset time threshold is exceeded and the transmission control unit still does not receive the shift execution completion and target gear position signal fed back by the electronic shift actuator, a gear position sensor abnormality is recorded and accumulated; If the number of times the gear position sensor is abnormal exceeds the abnormal number threshold, it is determined that the gear position sensor is malfunctioning.

3. The gear position sensor adaptive calibration control method according to claim 2, characterized in that: The preset time threshold is 300ms, and the abnormal number threshold is 3 times.

4. The gear position sensor adaptive calibration control method according to claim 1, characterized in that: In the case of abnormal gear position sensor function detection, the electronic shift actuator control unit prompts to perform gear position sensor adaptive calibration, specifically including: The electronic shift actuator control unit prompts the driver to stop the car and shift to P gear through the instrument panel and performs adaptive calibration of the gear position sensor.

5. The gear position sensor adaptive calibration control method according to claim 1, characterized in that: The adaptive calibration of the gear position sensor by using the electronic gear shift control unit specifically includes: The electronic shift actuator control unit sends a self-learning instruction to the gear position sensor; The electronic shift actuator control unit drives the shift actuator to rotate clockwise until it cannot rotate any more; The electronic shift actuator control unit sends a command to exit the P gear to drive the electronic shift actuator to rotate counterclockwise; The first driving force valley point is recorded as the P gear position; The second driving force valley point position is recorded as the R gear position; The third driving force valley point position is recorded as the N gear position; The fourth driving force valley point position is recorded as the D gear position.

6. The gear position sensor adaptive calibration control method according to claim 1, characterized in that: The gear position sensor adaptive calibration control method further includes: After the gear position sensor adaptive calibration is completed, determine whether the calibration is successful.

7. The gear position sensor adaptive calibration control method according to claim 6, characterized in that: After the gear position sensor adaptive calibration is completed, determining whether the calibration is successful specifically includes: The electronic shift actuator controller calculates the angle difference between each gear position, namely, P, R, N and D; If the angle difference meets the design requirements, the calibration is considered successful; If the angle difference exceeds the corresponding angle difference design threshold, the calibration is considered to have failed and adaptive calibration needs to be performed again; If the calibration fails even after exceeding the preset calibration times threshold, the calibration status of the gear position sensor is determined to be abnormal, and the driver is prompted to go to an after-sales service shop for repair.

8. The gear position sensor adaptive calibration control method according to claim 6, characterized in that: The gear position judgment principle of the gear position sensor in the middle of each gear position is: In the case of slow operation, the gear sensor can detect the gear signal. If the current gear is P gear, the gear signal is P gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters D gear; if the current gear is D gear, the gear signal is D gear before the driver enters N gear; if the current gear is N gear, the gear signal is N gear before the driver enters R gear; if the current gear is R gear, the gear signal is R gear before the driver enters P gear; In the case of rapid operation, the gear sensor may lose signal. If the current gear is P, when the driver quickly operates to the middle position from R→N, the sensor may lose the R signal, and the gear signal output is R. If the driver continuously operates from P to D, the gear signal must output P, ​​R, N, and D signals in sequence.

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