AMT clutch position control method and device

Abstract

The present invention relates to the technical field of AMT control, and discloses an AMT clutch position control method, wherein the actual position of the clutch is obtained in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch actual position is subtracted from the clutch set position to obtain the clutch position deviation value; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain the target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the position of the clutch is adjusted. The present invention also discloses an AMT clutch position control device. The AMT clutch position control method and device of the present invention realize the precise control of the clutch position, and can effectively improve the followability of the clutch position control.

Description

Technical Field

[0001] The present invention relates to the technical field of AMT control, and in particular to an AMT clutch position control method and device. Background Art

[0002] Compared with the traditional manual transmission (MT), the automatic transmission (AMT) has the advantages of simple operation, intelligent shifting, and taking into account both power and fuel consumption. Compared with AT, it has the advantages of strong power, high transmission efficiency, fuel saving, and low maintenance cost. It has become the main direction of the development of commercial vehicle transmissions in the future. During the starting and shifting process, the AMT will control the clutch to disengage or engage. At this time, the accuracy of the clutch position control will have a great impact on the starting and shifting quality. It is necessary to consider both the responsiveness of the clutch position control and the deterioration of the smoothness caused by position overshoot or large fluctuations.

[0003] In the prior art, position closed-loop control is usually used for the pneumatic actuator clutch of a mechanical automatic transmission. When the actual position deviates greatly from the target position, the dual valves in the clutch solenoid valve are used to output a large duty cycle for control; when the position deviation is small, the single valve in the clutch solenoid valve is used to output a small duty cycle for control. However, the control accuracy is low and the smoothness is poor. Summary of the invention

[0004] The purpose of the present invention is to provide an AMT clutch position control method and device to address the deficiencies of the above-mentioned technology, so as to achieve precise control of the clutch position and effectively improve the followability of the clutch position control.

[0005] To achieve the above-mentioned purpose, the AMT clutch position control method designed by the present invention obtains the actual position of the clutch in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch position deviation value is obtained by subtracting the clutch set position from the clutch actual position; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain the target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the position of the clutch is adjusted.

[0006] Preferably, n clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into n+1 sections. When PID control is performed on the air flow of the clutch actuator cylinder according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into n+1 groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The n sections of clutch position deviation values ​​correspond one-to-one to the n groups of P, I, and D coefficients in order from small to large.

[0007] Preferably, the clutch actuator is provided with four solenoid valves, including a large-diameter exhaust control solenoid valve, a small-diameter exhaust control solenoid valve, a large-diameter intake control solenoid valve and a small-diameter intake control solenoid valve. The large-diameter exhaust control solenoid valve, the small-diameter exhaust control solenoid valve, the large-diameter intake control solenoid valve and the small-diameter intake control solenoid valve all have working states of solenoid valve fully open, solenoid valve fully closed and opened according to duty cycle. The large-diameter exhaust control solenoid valve is used to achieve rapid engagement of the clutch, and the small-diameter exhaust control solenoid valve is used to achieve slow engagement of the clutch. The large-diameter intake control solenoid valve is used to achieve rapid separation of the clutch, and the small-diameter intake control solenoid valve is used to achieve slow separation of the clutch.

[0008] Preferably, when the target air flow rate is a positive number, a first air flow rate threshold and a second air flow rate threshold that increase in sequence are set, and the first air flow rate threshold and the second air flow rate threshold are both greater than 0. When the target air flow rate is less than the first air flow rate threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter intake control solenoid valve is in a duty cycle open working state. When the target air flow rate is greater than the first air flow rate threshold and less than the second air flow rate threshold, the large-diameter intake control solenoid valve is in a duty cycle open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state. When the target air flow rate is greater than the second air flow rate threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state.

[0009] Preferably, when the target air flow is a negative number, a third air flow threshold and a fourth air flow threshold that increase in sequence are set, and the third air flow threshold and the fourth air flow threshold are both less than 0. When the target air flow is less than the third air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the third air flow threshold and less than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a duty cycle open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter exhaust control solenoid valve is in a duty cycle open working state.

[0010] Preferably, a clutch position deviation value threshold is set for the clutch position deviation value, and the clutch position deviation value is divided into two sections. When PID control is performed on the air flow of the clutch actuator cylinder according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into two groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The two sections of clutch position deviation values ​​correspond one-to-one to the coefficients of the two groups of P, I, and D in order from small to large.

[0011] Preferably, the clutch position deviation value threshold is 10%. When the clutch position deviation value is less than 10%, the corresponding values ​​of P, I, and D coefficients are relatively low. When the clutch position deviation value is greater than 10%, the corresponding values ​​of P, I, and D coefficients are relatively high.

[0012] Preferably, two clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into three sections. When PID control is performed on the air flow of the clutch actuator cylinder according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into three groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The three sections of clutch position deviation values ​​correspond one-to-one to the three groups of P, I, and D coefficients in order from small to large.

[0013] Preferably, the clutch position deviation thresholds are 10% and 20%, and when the clutch position deviation is less than 10%, greater than 10%, less than 20%, and greater than 20%, the corresponding values ​​are the coefficients of P, I, and D from low to high, respectively.

[0014] An AMT clutch position control device comprises a clutch position sensor, an AMT control unit and a clutch actuator, wherein the clutch actual position is obtained in real time through the clutch position sensor, the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and uses the clutch actual position to subtract the clutch set position to obtain a clutch position deviation value, performs PID control on the air flow of the cylinder of the clutch actuator according to the clutch position deviation value to obtain a target air flow value, and finally determines the working state of the solenoid valve of the clutch actuator according to the target air flow value to adjust the position of the clutch.

[0015] The principle of the present invention is as follows:

[0016] In the present invention, when air enters the cylinder of the clutch actuator, the clutch actuator piston moves forward, thereby realizing the clutch moving in the disengagement direction; when air is exhausted from the cylinder of the clutch actuator, the clutch actuator piston moves backward, thereby realizing the clutch moving in the engagement direction. Therefore, to realize the precise control of the clutch position, it is necessary to precisely control the target air flow. In addition, the larger the P, I, and D coefficients are calibrated, the shorter the response time can be, thereby reaching the clutch target position faster; the smaller the P, I, and D coefficients are calibrated, the more control can be performed to avoid overshooting of the actual clutch position.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Realize precise control of clutch position, which can effectively improve the followability of clutch position control;

[0019] 2. The clutch position control method based on PID algorithm can be applied to different clutch systems;

[0020] 3. The proportional difference of the clutch displacement difference is divided into two groups of PID coefficients, which can shorten the response time and avoid overshoot. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the AMT clutch position control method of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0026] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0027] In the case of using “including”, “having” and “comprising” described in the present specification, unless otherwise used, there may also be another part or other parts, and the terms used may generally be in the singular but may also represent the plural form.

[0028] Example 1

[0029] like Figure 1As shown, an AMT clutch position control method is provided, wherein the actual clutch position is obtained in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch position deviation value is obtained by subtracting the clutch set position from the clutch actual position; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain a target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the clutch position is adjusted.

[0030] An AMT clutch position control device comprises a clutch position sensor, an AMT control unit and a clutch actuator. The actual position of the clutch is obtained in real time through the clutch position sensor. The AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and subtracts the clutch set position from the clutch actual position to obtain a clutch position deviation value. According to the clutch position deviation value, PID control is performed on the air flow of the cylinder of the clutch actuator to obtain a target air flow value. Finally, according to the target air flow value, the working state of the solenoid valve of the clutch actuator is determined to adjust the position of the clutch.

[0031] Example 2

[0032] like Figure 1 As shown, an AMT clutch position control method is provided, wherein the actual clutch position is obtained in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch position deviation value is obtained by subtracting the clutch set position from the clutch actual position; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain a target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the clutch position is adjusted.

[0033] Among them, n clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into n+1 sections. When PID control is performed on the air flow of the clutch actuator cylinder according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into n+1 groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The n-segment clutch position deviation value corresponds to the n-group P, I, and D coefficients in order from small to large.

[0034] In this embodiment, the clutch actuator is provided with four solenoid valves, including a large-diameter exhaust control solenoid valve, a small-diameter exhaust control solenoid valve, a large-diameter intake control solenoid valve and a small-diameter intake control solenoid valve. The large-diameter exhaust control solenoid valve, the small-diameter exhaust control solenoid valve, the large-diameter intake control solenoid valve and the small-diameter intake control solenoid valve all have working states of solenoid valve fully open, solenoid valve fully closed and open according to duty cycle.

[0035] When the target air flow is a positive number, a first air flow threshold and a second air flow threshold that increase in sequence are set, and the first air flow threshold and the second air flow threshold are both greater than 0. When the target air flow is less than the first air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter intake control solenoid valve is in a duty cycle open working state. When the target air flow is greater than the first air flow threshold and less than the second air flow threshold, the large-diameter intake control solenoid valve is in a duty cycle open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the second air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state.

[0036] When the target air flow is a negative number, a third air flow threshold and a fourth air flow threshold are set to increase in sequence, and the third air flow threshold and the fourth air flow threshold are both less than 0. When the target air flow is less than the third air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the third air flow threshold and less than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a duty cycle open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter exhaust control solenoid valve is in a duty cycle open working state.

[0037] An AMT clutch position control device comprises a clutch position sensor, an AMT control unit and a clutch actuator. The actual position of the clutch is obtained in real time through the clutch position sensor. The AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and subtracts the clutch set position from the clutch actual position to obtain a clutch position deviation value. According to the clutch position deviation value, PID control is performed on the air flow of the cylinder of the clutch actuator to obtain a target air flow value. Finally, according to the target air flow value, the working state of the solenoid valve of the clutch actuator is determined to adjust the position of the clutch.

[0038] Example 3

[0039] like Figure 1 As shown, an AMT clutch position control method is provided, wherein the actual clutch position is obtained in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch position deviation value is obtained by subtracting the clutch set position from the clutch actual position; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain a target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the clutch position is adjusted.

[0040] Among them, a clutch position deviation value threshold is set for the clutch position deviation value, and the clutch position deviation value is divided into 2 sections. When the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into 2 groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The 2-section clutch position deviation value corresponds to the 2 groups of P, I, and D coefficients in order from small to large.

[0041] In this embodiment, the clutch position deviation value threshold is 10%. When the clutch position deviation value is less than 10%, the corresponding values ​​of P, I, and D coefficients are relatively low. When the clutch position deviation value is greater than 10%, the corresponding values ​​of P, I, and D coefficients are relatively high.

[0042] In this embodiment, the clutch actuator is provided with four solenoid valves, including a large-diameter exhaust control solenoid valve, a small-diameter exhaust control solenoid valve, a large-diameter intake control solenoid valve and a small-diameter intake control solenoid valve. The large-diameter exhaust control solenoid valve, the small-diameter exhaust control solenoid valve, the large-diameter intake control solenoid valve and the small-diameter intake control solenoid valve all have working states of solenoid valve fully open, solenoid valve fully closed and open according to duty cycle.

[0043] When the target air flow is a positive number, a first air flow threshold and a second air flow threshold that increase in sequence are set, and the first air flow threshold and the second air flow threshold are both greater than 0. When the target air flow is less than the first air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter intake control solenoid valve is in a duty cycle open working state. When the target air flow is greater than the first air flow threshold and less than the second air flow threshold, the large-diameter intake control solenoid valve is in a duty cycle open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the second air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state.

[0044] When the target air flow is a negative number, a third air flow threshold and a fourth air flow threshold are set to increase in sequence, and the third air flow threshold and the fourth air flow threshold are both less than 0. When the target air flow is less than the third air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the third air flow threshold and less than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a duty cycle open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter exhaust control solenoid valve is in a duty cycle open working state.

[0045] An AMT clutch position control device comprises a clutch position sensor, an AMT control unit and a clutch actuator. The actual position of the clutch is obtained in real time through the clutch position sensor. The AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and subtracts the clutch set position from the clutch actual position to obtain a clutch position deviation value. According to the clutch position deviation value, PID control is performed on the air flow of the cylinder of the clutch actuator to obtain a target air flow value. Finally, according to the target air flow value, the working state of the solenoid valve of the clutch actuator is determined to adjust the position of the clutch.

[0046] Example 4

[0047] like Figure 1 As shown, an AMT clutch position control method is characterized in that: the actual position of the clutch is obtained in real time through a clutch position sensor; the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state; the clutch position deviation value is obtained by subtracting the clutch set position from the clutch actual position; the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value to obtain a target air flow value; the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value, and the position of the clutch is adjusted.

[0048] Among them, two clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into three sections. When the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into three groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The three sections of clutch position deviation values ​​correspond one by one to the three groups of P, I, and D coefficients in order from small to large.

[0049] In this embodiment, the clutch position deviation value thresholds are 10% and 20%. When the clutch position deviation value is less than 10%, greater than 10%, less than 20%, and greater than 20%, the corresponding values ​​are the coefficients of P, I, and D from low to high.

[0050] In this embodiment, the clutch actuator is provided with four solenoid valves, including a large-diameter exhaust control solenoid valve, a small-diameter exhaust control solenoid valve, a large-diameter intake control solenoid valve and a small-diameter intake control solenoid valve. The large-diameter exhaust control solenoid valve, the small-diameter exhaust control solenoid valve, the large-diameter intake control solenoid valve and the small-diameter intake control solenoid valve all have working states of solenoid valve fully open, solenoid valve fully closed and open according to duty cycle.

[0051] When the target air flow is a positive number, a first air flow threshold and a second air flow threshold that increase in sequence are set, and the first air flow threshold and the second air flow threshold are both greater than 0. When the target air flow is less than the first air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter intake control solenoid valve is in a duty cycle open working state. When the target air flow is greater than the first air flow threshold and less than the second air flow threshold, the large-diameter intake control solenoid valve is in a duty cycle open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the second air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state.

[0052] When the target air flow is a negative number, a third air flow threshold and a fourth air flow threshold are set to increase in sequence, and the third air flow threshold and the fourth air flow threshold are both less than 0. When the target air flow is less than the third air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the third air flow threshold and less than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a duty cycle open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter exhaust control solenoid valve is in a duty cycle open working state.

[0053] An AMT clutch position control device comprises a clutch position sensor, an AMT control unit and a clutch actuator. The actual position of the clutch is obtained in real time through the clutch position sensor. The AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and subtracts the clutch set position from the clutch actual position to obtain a clutch position deviation value. According to the clutch position deviation value, PID control is performed on the air flow of the cylinder of the clutch actuator to obtain a target air flow value. Finally, according to the target air flow value, the working state of the solenoid valve of the clutch actuator is determined to adjust the position of the clutch.

[0054] The AMT clutch position control method and device of the present invention can realize precise control of the clutch position and effectively improve the followability of the clutch position control; the clutch position control method based on the PID algorithm can be applicable to different clutch systems; the proportional difference of the clutch displacement difference is divided into two groups of PID coefficients, which can shorten the response time and avoid overshoot.

[0055] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

[0056] At the same time, it should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be construed as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims. The features of the various embodiments of the present invention may be partially or completely combined or spliced ​​with each other, and may be performed in various different configurations as those skilled in the art may fully understand. The embodiments of the present invention may be performed independently of each other, or may be performed together in a mutually dependent relationship.

[0057] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and the above structures should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for controlling an AMT clutch position, characterized in that: The actual position of the clutch is obtained in real time through the clutch position sensor; The AMT control unit calculates the clutch setting position based on driving intention and vehicle status; Subtract the clutch set position from the clutch actual position to obtain the clutch position deviation value; The air flow of the clutch actuator cylinder is PID-controlled according to the clutch position deviation value to obtain the target air flow value; Determine the working state of the solenoid valve of the clutch actuator according to the target air flow value and adjust the position of the clutch; n clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into n+1 sections. When the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value, P is proportional torque, I is integral torque, and D is differential torque. The coefficients of P, I, and D are divided into n+1 groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The n+1-section clutch position deviation value corresponds to the coefficient of the n+1 group of P, I, and D in order from small to large. The clutch actuator is provided with four solenoid valves, including a large-diameter exhaust control solenoid valve, a small-diameter exhaust control solenoid valve, a large-diameter intake control solenoid valve and a small-diameter intake control solenoid valve. The large-diameter exhaust control solenoid valve, the small-diameter exhaust control solenoid valve, the large-diameter intake control solenoid valve and the small-diameter intake control solenoid valve all have working states of solenoid valve fully open, solenoid valve fully closed and open according to duty cycle.

2. The AMT clutch position control method according to claim 1, characterized in that: When the target air flow is a positive number, a first air flow threshold and a second air flow threshold that increase in sequence are set, and the first air flow threshold and the second air flow threshold are both greater than 0. When the target air flow is less than the first air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter intake control solenoid valve is in a duty cycle open working state. When the target air flow is greater than the first air flow threshold and less than the second air flow threshold, the large-diameter intake control solenoid valve is in a duty cycle open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the second air flow threshold, the large-diameter intake control solenoid valve is in a solenoid valve fully open working state, and the small-diameter intake control solenoid valve is in a solenoid valve fully open working state.

3. The AMT clutch position control method according to claim 1, characterized in that: When the target air flow is a negative number, a third air flow threshold and a fourth air flow threshold are set to increase in sequence, and the third air flow threshold and the fourth air flow threshold are both less than 0. When the target air flow is less than the third air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the third air flow threshold and less than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a duty cycle open working state, and the small-diameter exhaust control solenoid valve is in a solenoid valve fully open working state. When the target air flow is greater than the fourth air flow threshold, the large-diameter exhaust control solenoid valve is in a solenoid valve fully closed working state, and the small-diameter exhaust control solenoid valve is in a duty cycle open working state.

4. The AMT clutch position control method according to claim 1, characterized in that: A clutch position deviation value threshold is set for the clutch position deviation value, and the clutch position deviation value is divided into two sections. When the air flow of the clutch actuator cylinder is PID controlled according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into two groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The two sections of clutch position deviation values ​​correspond to the coefficients of the two groups of P, I, and D in order from small to large.

5. The AMT clutch position control method according to claim 4, characterized in that: The clutch position deviation value threshold is 10%. When the clutch position deviation value is less than 10%, the corresponding values ​​of P, I, and D coefficients are relatively low. When the clutch position deviation value is greater than 10%, the corresponding values ​​of P, I, and D coefficients are relatively high.

6. The AMT clutch position control method according to claim 1, characterized in that: Two clutch position deviation value thresholds are set for the clutch position deviation value, and the clutch position deviation value is divided into three sections. When the air flow of the clutch actuator cylinder is controlled by PID according to the clutch position deviation value, P is the proportional torque, I is the integral torque, and D is the differential torque. The coefficients of P, I, and D are divided into three groups according to the clutch position deviation value, and the coefficients are calibrated respectively. The value of the coefficient of each group of P, I, and D is smaller than the value of the coefficient of the next group of P, I, and D. The three sections of clutch position deviation values ​​correspond to the three groups of P, I, and D coefficients in order from small to large.

7. The AMT clutch position control method according to claim 6, characterized in that: The clutch position deviation value thresholds are 10% and 20%. When the clutch position deviation value is less than 10%, greater than 10%, less than 20%, and greater than 20%, the corresponding values ​​are the coefficients of P, I, and D from low to high, respectively.

8. An AMT clutch position control device, characterized in that: The AMT clutch position control method as described in claim 1 includes a clutch position sensor, an AMT control unit and a clutch actuator, wherein the actual position of the clutch is obtained in real time through the clutch position sensor, the AMT control unit calculates the clutch set position according to the driving intention and the vehicle state, and uses the clutch actual position to subtract the clutch set position to obtain the clutch position deviation value, and PID control is performed on the air flow of the cylinder of the clutch actuator according to the clutch position deviation value to obtain the target air flow value, and finally the working state of the solenoid valve of the clutch actuator is determined according to the target air flow value to adjust the position of the clutch.

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