CN118293217A - AMT downgrade processing method, device and medium based on clutch position - Google Patents

Abstract

The embodiment of the specification discloses an AMT degradation processing method, equipment and medium based on clutch position, and relates to the technical field of AMT, wherein the method comprises the following steps: collecting position data by a real-time clutch of a clutch position sensor, collecting position data by the real-time clutch, analyzing the position reliability of the clutch, and determining the position reliability state of the clutch corresponding to the clutch position sensor, wherein the position reliability state of the clutch comprises a reliability state and an unreliability state; when the reliable state of the clutch position is an unreliable state, determining real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; and according to the real-time clutch estimated position data and a preset duty ratio control strategy, the clutch is subjected to open-loop control, AMT degradation processing is realized, the normal clutch release engagement of the vehicle is ensured, and the reliability of the system is improved.

Description

AMT downgrade processing method, device and medium based on clutch position

Technical Field

The present specification relates to the field of AMT technology, and in particular to a method, device and medium for processing AMT degradation based on clutch position.

Background technique

Automated Mechanical Transmission (AMT) is an automatic transmission system composed of a traditional dry friction plate clutch and a manual transmission, plus a transmission control unit (TCU) and a selector and clutch actuator. In the AMT technology, accurate detection of the clutch position is a key link to ensure the normal driving and shifting functions of the vehicle. The clutch position sensor is used to monitor the state of the clutch in real time and transmit relevant information to the control system to achieve precise control of the clutch.

At present, in the control method of the clutch, the real-time position of the clutch is mostly collected through the clutch position sensor. However, in actual applications, the clutch position sensor may cause the position information to be unreliable due to various reasons (such as sensor failure, signal interference, etc.). During the driving process of the vehicle, once the clutch position sensor position is unreliable, the real-time position of the clutch cannot be obtained, and the clutch cannot be separated and engaged, and the basic functions such as starting and shifting cannot be realized, which affects the driving of the vehicle. Therefore, during the driving process of the vehicle, once the clutch position sensor position is unreliable, the vehicle will not be able to start and shift normally, which will seriously affect the driving experience and driving safety.

Summary of the invention

One or more embodiments of the present specification provide a clutch position-based AMT degradation processing method, device and medium for solving the following technical problems: During vehicle driving, once the clutch position sensor position is unreliable, the vehicle will not be able to start and shift gears normally, seriously affecting the driving experience and driving safety.

One or more embodiments of this specification adopt the following technical solutions:

One or more embodiments of the present specification provide an AMT degradation processing method based on clutch position, the method comprising: collecting real-time clutch collected position data of a clutch position sensor, performing position credibility analysis on the clutch through the real-time clutch collected position data, and determining a clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an untrustworthy state; when the clutch position credibility state is the untrustworthy state, determining real-time clutch estimated position data according to a pre-constructed clutch position estimation model and pre-acquired clutch target position data; and performing open-loop control on the clutch according to the real-time clutch estimated position data and a preset duty cycle control strategy to achieve AMT degradation processing.

Further, through the real-time clutch position data, a position credibility analysis is performed on the clutch to determine the clutch position credibility state corresponding to the clutch position sensor, which specifically includes: obtaining the clutch position range corresponding to the clutch, and judging the position data of the clutch according to the real-time clutch position data and the clutch position range to determine whether the real-time clutch position meets the clutch position range; obtaining the current collection time of the real-time clutch position data to determine the historical collection time of the collection cycle before the current collection time and the historical clutch position data corresponding to the historical collection time; determining the current position change rate of the clutch through the current collection time, the real-time clutch position data, the historical collection time and the historical clutch position data; judging whether the real-time clutch position exceeds a preset position change threshold according to the current position change rate; when the real-time clutch position does not meet the clutch position range, or the real-time clutch position exceeds the preset position change threshold, determining that the clutch position credibility state corresponding to the clutch position sensor is an untrustworthy state.

Furthermore, before determining the real-time clutch estimated position data based on the pre-constructed clutch position estimation model and the pre-acquired clutch target position data, the method further includes: constructing a clutch position estimation model, wherein the clutch position estimation model is as follows: L _x = L-[(L ₀ -L ₁ )+

∫(Q ₁ +Q ₂ -Q ₃ -Q ₄ )/Sdt]; where L _x is the real-time clutch estimated position data, L ₀ is the clutch fully engaged position, L ₁ is the pre-acquired initial clutch position, L is the total stroke of the clutch, Q ₁ is the flow of the clutch release fast valve at a specified duty cycle, Q ₂ is the flow of the clutch release slow valve at a specified duty cycle, Q ₃ is the flow of the clutch engagement fast valve at a specified duty cycle, Q ₄ is the flow of the clutch engagement slow valve at a specified duty cycle, and S is the cylinder cross-sectional area of the clutch actuator.

Further, according to the pre-constructed clutch position estimation model and the pre-acquired clutch target position data, the real-time clutch estimated position data is determined, specifically including: determining the initial clutch position, wherein the initial clutch position is the position when the clutch position credible state is the uncredible state; determining the target adjustment duty cycle through the initial clutch position and the clutch target position data; determining the specified duty cycle based on the target adjustment duty cycle, and obtaining the flow data set of the clutch actuator at the specified duty cycle, wherein the flow data set includes the flow of the clutch separation fast valve at the specified duty cycle, the flow of the clutch separation slow valve at the specified duty cycle, the flow of the clutch engagement fast valve at the specified duty cycle, and the flow of the clutch engagement slow valve at the specified duty cycle; obtaining the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch; calculating the real-time clutch estimated position data through the clutch position estimation model according to the initial clutch position, the flow data set, the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch.

Furthermore, determining the initial clutch position specifically includes: when the untrusted state is the first untrusted state, obtaining the current collection time of the real-time clutch collection position data to determine the historical clutch collection position data of the previous collection cycle at the current collection time; determining the initial clutch position based on the historical clutch collection position data; when the untrusted state is not the first untrusted state, obtaining the historical clutch estimated position data of the previous moment of the current collection time to determine the initial clutch position.

Further, according to the real-time clutch estimated position data and the preset duty cycle control strategy, the clutch is open-loop controlled, specifically including: determining the target operation information of the clutch according to the real-time clutch estimated position data and the clutch target position data, wherein the target operation information includes a target operation mode and a target operation range, the target operation mode includes any one of clutch separation and clutch engagement, and the target operation range includes full-range operation and non-full-range operation; determining the corresponding clutch actuator to be operated through the target operation mode in the target operation information, wherein the clutch actuator to be operated includes any one or more of a clutch separation fast valve, a clutch separation slow valve, a clutch engagement fast valve and a clutch engagement slow valve; determining the duty cycle to be adjusted of the clutch actuator to be operated according to the target operation range in the target operation information and the duty cycle control strategy; and performing open-loop control of the clutch.

Furthermore, the corresponding clutch actuator to be operated is determined through the target operation mode in the target operation information, specifically including: when the target operation mode is clutch separation, the clutch actuator to be operated is determined to be the clutch separation fast valve and the clutch separation slow valve; when the target operation mode is clutch engagement, the clutch actuator to be operated is determined to be the clutch engagement fast valve and the clutch engagement slow valve; according to the target operation range and the duty cycle control strategy in the target operation information, the duty cycle to be adjusted of the clutch actuator to be operated is determined, specifically including: when the target operation range is full-range operation, the duty cycle to be adjusted of the clutch actuator to be operated is determined to be a preset first duty cycle; when the target operation range is non-full-range operation, the duty cycle to be adjusted of the clutch actuator to be operated is determined to be a preset second duty cycle.

Furthermore, the clutch is open-loop controlled through the duty cycle to be adjusted, specifically including: when the target operating range is not full-range operation, the preset second duty cycle is used to control the clutch actuator to be operated, and the current clutch estimated position of the clutch is determined through the preset second duty cycle; when the difference between the current clutch estimated position and the clutch target position data is not greater than a preset threshold value, the clutch actuator to be operated is adjusted to zero.

One or more embodiments of the present specification provide an AMT degradation processing device based on a clutch position, comprising:

at least one processor; and,

a memory communicatively connected to the at least one processor; wherein,

The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to:

Collect real-time clutch position data collected by the clutch position sensor, perform position credibility analysis on the clutch through the real-time clutch position data, and determine the clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an untrusted state; when the clutch position credibility state is the untrusted state, determine the real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; perform open-loop control on the clutch according to the real-time clutch estimated position data and a preset duty cycle control strategy to achieve AMT degradation processing.

One or more embodiments of this specification provide a non-volatile computer storage medium storing computer executable instructions, wherein the computer executable instructions are configured to:

Collect real-time clutch position data collected by the clutch position sensor, perform position credibility analysis on the clutch through the real-time clutch position data, and determine the clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an untrusted state; when the clutch position credibility state is the untrusted state, determine the real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; perform open-loop control on the clutch according to the real-time clutch estimated position data and a preset duty cycle control strategy to achieve AMT degradation processing.

At least one of the above technical solutions adopted in the embodiments of this specification can achieve the following beneficial effects: through the above technical solution, by real-time collection of clutch position data and reliability analysis, it is possible to respond quickly when a problem occurs in the clutch position sensor. In an unreliable state, the system can rely on estimated position data for open-loop control, thereby avoiding erroneous operations caused by sensor failure and improving the driving safety of the vehicle; in the case of an unreliable clutch position sensor, the basic driving functions of the vehicle, such as starting and shifting, can be maintained through the clutch position estimation model and open-loop control strategy, ensuring that the driver can still drive the vehicle to a safe place for repair when the sensor fails; the design of a downgrade processing strategy This enables the AMT system to maintain a certain degree of stability and reliability when facing sensor failures, enhancing the robustness of the system. Even when the sensor is unreliable, the system can still control it by estimating the position data to avoid complete system failure. By collecting clutch position data in real time and performing credibility analysis, the system can promptly detect sensor failures and prompt the driver to perform repairs, which helps to formulate reasonable maintenance strategies based on the fault conditions. When the clutch position sensor fails, the downgrade processing strategy can minimize the impact of the failure on the driving experience. Although downgrade processing may result in restrictions on some advanced functions, the system can still maintain basic driving functions, thereby improving the user's driving experience in fault conditions.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. In the drawings:

FIG1 is a schematic flow chart of an AMT downgrade processing method based on clutch position provided in an embodiment of this specification;

FIG2 is a flow chart of another AMT downgrade processing method based on clutch position provided in an embodiment of this specification;

FIG3 is a schematic structural diagram of an AMT degradation processing device based on clutch position provided in an embodiment of this specification.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

Automated Mechanical Transmission (AMT) is an automatic transmission system composed of a traditional dry friction plate clutch and a manual transmission, plus a transmission control unit (TCU) and a selector and clutch actuator. In the AMT technology, accurate detection of the clutch position is a key link to ensure the normal driving and shifting functions of the vehicle. The clutch position sensor is used to monitor the state of the clutch in real time and transmit relevant information to the control system to achieve precise control of the clutch.

At present, in the control method of the clutch, the real-time position of the clutch is mostly collected through the clutch position sensor. However, in actual applications, the clutch position sensor may cause the position information to be unreliable due to various reasons (such as sensor failure, signal interference, etc.). During the driving process of the vehicle, once the clutch position sensor position is unreliable, the real-time position of the clutch cannot be obtained, and the clutch cannot be separated and engaged, and the basic functions such as starting and shifting cannot be realized, which affects the driving of the vehicle. Therefore, during the driving process of the vehicle, once the clutch position sensor position is unreliable, the vehicle will not be able to start and shift normally, which will seriously affect the driving experience and driving safety.

The embodiment of this specification provides an AMT downgrade processing method based on clutch position. It should be noted that the execution subject in the embodiment of this specification can be a server or any device with data processing capabilities. Figure 1 is a flow chart of an AMT downgrade processing method based on clutch position provided by the embodiment of this specification. As shown in Figure 1, it mainly includes the following steps:

Step S101, collecting real-time clutch position data collected by the clutch position sensor, performing position credibility analysis on the clutch through the real-time clutch position data, and determining a clutch position credibility state corresponding to the clutch position sensor.

Wherein, the clutch position credible state includes a credible state and an uncredible state;

In one embodiment of the present specification, when the AMT vehicle is driving normally, the real-time clutch position data is obtained through the clutch position sensor. The clutch position sensor in the clutch actuator can directly reflect the real-time position of the clutch piston, which is equivalent to indirectly detecting the real-time position of the clutch. In general, the followability of the actual position of the clutch and the target position is achieved through closed-loop control. The closed-loop control here refers to controlling the switch of the clutch solenoid valve through a certain control method, detecting the position of the clutch and using the position feedback as an input to affect the control of the clutch. The control is relatively complex and can achieve precise control of the clutch. Through the real-time clutch position data, the position credibility analysis of the clutch is performed to determine the clutch position credibility state corresponding to the clutch position sensor.

The real-time clutch position data is collected to analyze the position credibility of the clutch and determine the clutch position credibility state corresponding to the clutch position sensor, which specifically includes: obtaining the clutch position range corresponding to the clutch, and judging the position data of the clutch according to the real-time clutch position data and the clutch position range to determine whether the real-time clutch position meets the clutch position range; obtaining the current collection time of the real-time clutch position data to determine the historical collection time of the collection cycle before the current collection time and the historical clutch position data corresponding to the historical collection time; determining the current position change rate of the clutch through the current collection time, the real-time clutch position data, the historical collection time and the historical clutch position data; judging whether the real-time clutch position exceeds a preset position change threshold according to the current position change rate; when the real-time clutch position does not meet the clutch position range, or the real-time clutch position exceeds the preset position change threshold, determining that the clutch position credibility state corresponding to the clutch position sensor is an untrustworthy state.

In one embodiment of the present specification, the clutch position range corresponding to the clutch, that is, the specified position variation range of the clutch, is obtained, which can be determined by clutch parameters, empirical data, etc. According to the real-time clutch position data and the clutch position range, it is determined whether the real-time clutch position collected by the clutch position sensor is within the clutch position range.

In actual application scenarios, the acquisition frequency of the clutch position sensor may be different. The current acquisition moment corresponding to the real-time clutch acquisition position data is obtained, and the historical acquisition moment of the previous acquisition cycle of the current acquisition moment is determined by the current acquisition moment. The previous acquisition cycle here can be every millisecond, etc., which is related to the acquisition frequency of the clutch position sensor. The historical clutch acquisition position data corresponding to the historical acquisition moment is obtained. The time difference is calculated by the current acquisition moment and the historical acquisition moment, and the position difference is determined by the real-time clutch acquisition position data and the historical clutch acquisition position data. The current position change rate of the clutch is determined by the ratio of the position difference and the time difference. It should be noted that the position change rate of the clutch should not be greater than the preset position change threshold. The position change threshold here can be calculated by multiple tests or obtained by empirical data. According to the current position change rate, it is judged whether the real-time clutch position exceeds the preset position change threshold. When the real-time clutch position does not meet the clutch position range, or the real-time clutch position exceeds the preset position change threshold, the clutch position credible state corresponding to the clutch position sensor is determined to be an untrustworthy state. That is to say, as long as one of the conditions of not conforming to the clutch position range and exceeding the preset position change threshold is met, the clutch position credible state corresponding to the clutch position sensor is determined to be an uncredible state.

When the real-time clutch position meets the clutch position range and the real-time clutch position does not exceed a preset position change threshold, the clutch position credible state corresponding to the clutch position sensor is determined to be a credible state.

Through the above technical solution, the clutch position data is monitored in real time and credibility analysis is performed, so that when a sensor fails or the data is abnormal, it can be discovered in time, avoiding incorrect operations such as starting and shifting due to inaccurate clutch position information, thereby ensuring driving safety; accurate detection of the clutch position is the basis for the stable operation of the AMT system. By real-time collection and analysis of the clutch position data, the clutch action can be controlled more accurately, reducing system fluctuations or failures caused by sensor problems, and improving the overall stability of the system; precise control of the clutch position has an important impact on the vehicle's starting stability, gear shifting smoothness, etc., through real-time collection and analysis of the clutch position data, the clutch state can be judged more accurately, thereby performing more refined control and optimizing the driving experience.

Step S102, when the clutch position credible state is an uncredible state, determining real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data.

In one embodiment of the present specification, when the clutch position credible state is a credible state, the followability of the actual clutch position and the target position is achieved through closed-loop control. When the clutch position credible state is an untrustworthy state, when it is confirmed that the clutch position is untrustworthy, the TCU will confirm and send a fault code to the instrument, report the clutch position untrustworthy fault, and remind the driver that the vehicle has a fault. At the same time, the TCU determines the real-time clutch estimated position data based on the pre-built clutch position estimation model and the pre-acquired clutch target position data, and switches the control of the clutch solenoid valve from closed-loop control to open-loop control.

Before determining the real-time clutch estimated position data according to the pre-constructed clutch position estimation model and the pre-acquired clutch target position data, the method also includes: constructing a clutch position estimation model, the clutch position estimation model is as follows: L _x =L-[(L ₀ -L ₁ )+∫(Q ₁ +Q ₂ -Q ₃ -Q ₄ )/Sdt]; wherein L _x is the real-time clutch estimated position data, L ₀ is the clutch fully engaged position, L ₁ is the pre-acquired initial clutch position, L is the total stroke of the clutch, Q ₁ is the flow of the clutch release fast valve at a specified duty cycle, Q ₂ is the flow of the clutch release slow valve at a specified duty cycle, Q ₃ is the flow of the clutch engagement fast valve at a specified duty cycle, Q ₄ is the flow of the clutch engagement slow valve at a specified duty cycle, and S is the cylinder cross-sectional area of the clutch actuator.

In one embodiment of the present specification, since the clutch solenoid valve has different flow rates at different duty cycles and the cylinder cross-sectional area of the clutch actuator is fixed, a clutch position estimation model is constructed, and the clutch position estimation model is as follows: L _x =L-[(L ₀ -L ₁ )+∫(Q ₁ +Q ₂ -Q ₃ -Q ₄ )/Sdt]; wherein L _x is real-time clutch estimated position data, L ₀ is the clutch fully engaged position, L ₁ is a pre-acquired initial clutch position, where the initial clutch position is the position when the clutch position is unreliable, L is the total stroke of the clutch, Q ₁ is the flow rate of the clutch release fast valve at a specified duty cycle, Q ₂ is the flow rate of the clutch release slow valve at a specified duty cycle, Q ₃ is the flow rate of the clutch engagement fast valve at a specified duty cycle, Q ₄ is the flow rate of the clutch engagement slow valve at a specified duty cycle, and S is the cylinder cross-sectional area of the clutch actuator.

According to the pre-built clutch position estimation model and the pre-acquired clutch target position data, the real-time clutch estimated position data is determined, specifically including: determining the initial clutch position, wherein the initial clutch position is the position when the clutch position credible state is the uncredible state; determining the target adjustment duty cycle through the initial clutch position and the clutch target position data; determining the specified duty cycle based on the target adjustment duty cycle, and acquiring the flow data set of the clutch actuator at the specified duty cycle, wherein the flow data set includes the flow of the clutch separation fast valve at the specified duty cycle, the flow of the clutch separation slow valve at the specified duty cycle, the flow of the clutch engagement fast valve at the specified duty cycle, and the flow of the clutch engagement slow valve at the specified duty cycle; acquiring the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch; calculating the real-time clutch estimated position data through the clutch position estimation model according to the initial clutch position, the flow data set, the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch.

In one embodiment of the present specification, the initial clutch position when the clutch position credible state is an untrustworthy state is determined, and the target adjustment duty cycle is determined by the TCU according to the initial clutch position and the clutch target position data. The target adjustment duty cycle is used as the specified duty cycle, and the flow data set of the clutch actuator under the specified duty cycle is obtained. The flow data set includes the flow of the clutch separation fast valve under the specified duty cycle, the flow of the clutch separation slow valve under the specified duty cycle, the flow of the clutch engagement fast valve under the specified duty cycle, and the flow of the clutch engagement slow valve under the specified duty cycle. The clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch are obtained through the clutch parameters. The above parameters are only subject to the restrictions of the clutch, and the above parameters of each clutch are fixed parameters. The initial clutch position, the flow data set, the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch are input into the clutch position estimation model, and the real-time clutch estimated position data is output.

Determining the initial clutch position specifically includes: when the untrusted state is the first untrusted state, obtaining the current collection time of the real-time clutch collection position data to determine the historical clutch collection position data of the previous collection cycle at the current collection time; determining the initial clutch position based on the historical clutch collection position data; when the untrusted state is not the first untrusted state, obtaining the historical clutch estimated position data of the previous moment of the current collection time to determine the initial clutch position.

In one embodiment of the present specification, the initial clutch position is the position when the clutch position trust state is an untrusted state. In actual application scenarios, there are two situations. One is the first untrusted state. In this case, it means that the data collected by the current clutch position sensor is no longer trustworthy. The position data collected last time is used as the initial clutch position, that is, the historical clutch position data collected in the previous collection cycle at the current collection moment. The other is when the untrusted state is not the first untrusted state, that is, the data collected last time is also no longer trustworthy. In this case, the clutch position information of the last time has been estimated by the method in the embodiment of the present specification. Therefore, the historical clutch estimated position data at the previous moment of the current collection moment is determined as the initial clutch position.

Through the above technical scheme, when the clutch position is credible, closed-loop control can ensure that the actual position of the clutch closely follows the target position to achieve precise control, which helps to improve the vehicle's starting stability, gear shifting smoothness, and overall driving performance. When the clutch position sensor is unreliable, the TCU can quickly confirm the fault and send a fault code to the instrument to remind the driver to repair it in time, which helps the driver to understand the vehicle status in time and avoid potential risks caused by sensor failure. When the clutch position is unreliable, the TCU determines the real-time clutch estimated position data through the clutch position estimation model and switches to open-loop control. Open-loop control can ensure the availability of the clutch in basic functions, such as starting and shifting, thereby ensuring the basic driving ability of the vehicle. The design of the entire degradation processing strategy enables the AMT system to maintain a certain functionality and stability in the face of sensor failure, thereby improving the robustness and reliability of the system.

Step S103, based on the real-time clutch estimated position data and the preset duty cycle control strategy, the clutch is open-loop controlled to achieve AMT degradation processing.

The clutch is open-loop controlled according to the real-time clutch estimated position data and the preset duty cycle control strategy, specifically including: determining the target operation information of the clutch according to the real-time clutch estimated position data and the clutch target position data, wherein the target operation information includes a target operation mode and a target operation range, the target operation mode includes any one of clutch separation and clutch engagement, and the target operation range includes full-range operation and non-full-range operation; determining the corresponding clutch actuator to be operated through the target operation mode in the target operation information, wherein the clutch actuator to be operated includes any one or more of a clutch separation fast valve, a clutch separation slow valve, a clutch engagement fast valve and a clutch engagement slow valve; determining the duty cycle to be adjusted of the clutch actuator to be operated according to the target operation range in the target operation information and the duty cycle control strategy; and performing open-loop control on the clutch through the duty cycle to be adjusted.

The corresponding clutch actuator to be operated is determined through the target operation mode in the target operation information, specifically including: when the target operation mode is clutch separation, the clutch actuator to be operated is determined to be the clutch separation fast valve and the clutch separation slow valve; when the target operation mode is clutch engagement, the clutch actuator to be operated is determined to be the clutch engagement fast valve and the clutch engagement slow valve; according to the target operation range and the duty cycle control strategy in the target operation information, the duty cycle to be adjusted of the clutch actuator to be operated is determined, specifically including: when the target operation range is full-range operation, the duty cycle to be adjusted of the clutch actuator to be operated is determined to be a preset first duty cycle; when the target operation range is non-full-range operation, the duty cycle to be adjusted of the clutch actuator to be operated is determined to be a preset second duty cycle.

It should be noted that the preset second duty cycle is the minimum duty cycle of the clutch solenoid valve, which refers to the minimum duty cycle that can drive the clutch solenoid valve to open. For example, the preset second duty cycle can be determined to be 8% based on empirical data; the preset first duty cycle is 100%, which can also be determined based on empirical data.

The clutch is open-loop controlled through the duty cycle to be adjusted, specifically including: when the target operating range is not within the full range, the preset second duty cycle is used to control the clutch actuator to be operated, and the current clutch estimated position of the clutch is determined through the preset second duty cycle; when the difference between the current clutch estimated position and the clutch target position data is not greater than a preset threshold value, the clutch actuator to be operated is adjusted to zero.

It should be noted that, in general, in order to prevent the clutch from rushing out of the target position, the real-time position of the clutch should be at a certain distance from the target position. The distance here is the preset threshold value, which can be set according to demand or empirical data. By switching the control of the clutch solenoid valve from closed-loop control to open-loop control and using the minimum duty cycle for control, the normal separation and engagement of the clutch is ensured, and the AMT degradation processing plan is ensured when the clutch position sensor has problems, so as to ensure that the vehicle can normally separate and engage the clutch, thereby realizing basic starting and shifting functions and improving the reliability of the AMT system.

Through the above technical solution, by collecting clutch position data in real time and performing credibility analysis, the system can respond quickly when a clutch position sensor has a problem. In an untrusted state, the system can rely on estimated position data for open-loop control, thereby avoiding erroneous operations caused by sensor failure and improving the driving safety of the vehicle. In the case of an untrusted clutch position sensor, the basic driving functions of the vehicle, such as starting and shifting, can be maintained through the clutch position estimation model and the open-loop control strategy, ensuring that the driver can still drive the vehicle to a safe place for repair when the sensor fails. The design of the degradation processing strategy enables the AMT system to maintain a certain stability and reliability in the face of sensor failure, enhancing the robustness of the system. Even when the sensor is untrusted, the system can control by estimating position data to avoid complete system failure. By collecting clutch position data in real time and performing credibility analysis, the system can detect sensor failures in time and prompt the driver to perform repairs, which helps to formulate a reasonable maintenance strategy according to the fault situation. When the clutch position sensor fails, the degradation processing strategy can minimize the impact of the fault on the driving experience. Although the degradation processing may result in the limitation of some advanced functions, the system can still maintain basic driving functions, thereby improving the user's driving experience in the case of a fault.

FIG2 is a flow chart of another AMT downgrade processing method based on clutch position provided by an embodiment of this specification. As shown in FIG2, the method includes: when it is confirmed that the clutch position is unreliable, the TCU will confirm and send a fault code to the instrument, report the clutch position unreliable fault, and remind the driver that the vehicle has a fault. At the same time, the TCU estimates the actual position of the clutch based on the model, and switches the control of the clutch solenoid valve from closed-loop control to open-loop control.

When the clutch needs to be disengaged in the next step and the clutch target position is the fully disengaged position, the disengagement fast valve and the disengagement slow valve both use a 100% duty cycle, which is 0 after a certain time threshold. Otherwise, the disengagement fast valve and the disengagement slow valve both use the minimum duty cycle disengagement control, the clutch target position and the actual position deviation ≤ the threshold, and the duty cycle of each clutch solenoid valve is 0.

When the clutch needs to be engaged in the next step and the clutch target position is the fully engaged position, the engagement fast valve and the engagement slow valve simultaneously use a 100% duty cycle, which becomes 0 after a certain time threshold. Otherwise, the engagement fast valve and the engagement slow valve simultaneously use the minimum duty cycle engagement control, the deviation between the clutch target position and the actual position is ≤ the threshold, and the duty cycle of each clutch solenoid valve is 0.

When neither separation nor engagement is required, the clutch solenoid valve duty cycle is 0 and the clutch maintains the current position.

Through the above technical solution, when the clutch position is unreliable, the real-time position of the clutch is calculated based on the current position of the clutch and the flow integral to ensure the accuracy of the clutch position; when the clutch position is unreliable, the control of the clutch solenoid valve is switched from closed-loop control to open-loop control, and the minimum duty cycle is used for control to ensure normal separation and engagement of the clutch, and to ensure the AMT downgrade processing solution when the clutch position sensor has problems, to ensure that the vehicle can normally separate and engage the clutch, thereby realizing basic starting and shifting functions, and improving the reliability of the AMT system.

The embodiment of the present specification also provides an AMT degradation processing device based on clutch position, as shown in FIG3 , the device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

Collect real-time clutch position data collected by the clutch position sensor, perform position credibility analysis on the clutch through the real-time clutch position data, and determine the clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an untrusted state; when the clutch position credibility state is the untrusted state, determine the real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; perform open-loop control on the clutch according to the real-time clutch estimated position data and a preset duty cycle control strategy to realize AMT degradation processing.

The embodiment of the present specification also provides a non-volatile computer storage medium storing computer executable instructions, wherein the computer executable instructions are configured as follows:

Collect real-time clutch position data collected by the clutch position sensor, perform position credibility analysis on the clutch through the real-time clutch position data, and determine the clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an untrusted state; when the clutch position credibility state is the untrusted state, determine the real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; perform open-loop control on the clutch according to the real-time clutch estimated position data and a preset duty cycle control strategy to realize AMT degradation processing.

Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

The above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

The devices and media provided in the embodiments of this specification correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

This specification is described with reference to the flowchart and/or block diagram of the method, device (system), and computer program product according to the embodiment of this specification. It should be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of the process and/or box in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

In a typical configuration, a computing device includes one or more processors (CPU), input/output interfaces, network interfaces, and memory.

The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and/or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims (10)

1. A method for processing AMT degradation based on clutch position, characterized in that the method comprises: Collecting real-time clutch position data collected by a clutch position sensor, performing position credibility analysis on the clutch through the real-time clutch position data, and determining a clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an uncredible state; When the clutch position credible state is the untrustworthy state, determining real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; According to the real-time clutch estimated position data and the preset duty cycle control strategy, the clutch is open-loop controlled to achieve AMT downgrade processing. 2. The AMT degradation processing method based on clutch position according to claim 1 is characterized in that the position data of the clutch is collected in real time, the position credibility analysis of the clutch is performed, and the clutch position credibility state corresponding to the clutch position sensor is determined, which specifically includes: Acquire a clutch position range corresponding to the clutch, and perform position data judgment on the clutch according to the real-time clutch position data and the clutch position range to determine whether the real-time clutch position meets the clutch position range; Acquire the current collection time of the real-time clutch collection position data to determine the historical collection time of the collection cycle before the current collection time and the historical clutch collection position data corresponding to the historical collection time; Determining the current position change rate of the clutch through the current collection time, the real-time clutch collection position data, the historical collection time and the historical clutch collection position data; According to the current position change rate, determining whether the real-time clutch position exceeds a preset position change threshold; When the real-time clutch position does not conform to the clutch position range, or the real-time clutch position exceeds a preset position change threshold, it is determined that the clutch position credible state corresponding to the clutch position sensor is an uncredible state. 3. The method for processing AMT degradation based on clutch position according to claim 1, characterized in that before determining the real-time clutch estimated position data based on the pre-built clutch position estimation model and the pre-acquired clutch target position data, the method further comprises: A clutch position estimation model is constructed, and the clutch position estimation model is as follows: L _x =L-[(L ₀ -L ₁ )+∫(Q ₁ +Q ₂ -Q ₃ -Q ₄ )/Sdt]; Wherein, _Lx is the real-time clutch estimated position data, _L0 is the clutch fully engaged position, _L1 is the pre-acquired initial clutch position, L is the total stroke of the clutch, _Q1 is the flow of the clutch release fast valve at a specified duty cycle, _Q2 is the flow of the clutch release slow valve at a specified duty cycle, _Q3 is the flow of the clutch engagement fast valve at a specified duty cycle, _Q4 is the flow of the clutch engagement slow valve at a specified duty cycle, and S is the cylinder cross-sectional area of the clutch actuator. 4. The method for processing AMT degradation based on clutch position according to claim 1, characterized in that the real-time clutch estimated position data is determined according to a pre-built clutch position estimation model and pre-acquired clutch target position data, specifically comprising: Determining an initial clutch position, wherein the initial clutch position is a position when the clutch position credible state is an uncredible state; determining a target adjustment duty cycle through the initial clutch position and the clutch target position data; Based on the target adjustment duty cycle, a specified duty cycle is determined, and a flow data set of the clutch actuator under the specified duty cycle is obtained, wherein the flow data set includes a flow of a clutch release fast valve under the specified duty cycle, a flow of a clutch release slow valve under the specified duty cycle, a flow of a clutch engagement fast valve under the specified duty cycle, and a flow of a clutch engagement slow valve under the specified duty cycle; Obtaining the fully engaged position of the clutch, the cylinder cross-sectional area of the clutch actuator, and the total stroke of the clutch; The real-time clutch estimated position data is calculated by the clutch position estimation model according to the initial clutch position, the flow data set, the clutch fully engaged position, the cylinder cross-sectional area of the clutch actuator and the total stroke of the clutch. 5. The method for processing AMT degradation based on clutch position according to claim 4, characterized in that determining the initial clutch position specifically comprises: When the untrusted state is the first untrusted state, obtaining the current collection time of the real-time clutch collection position data to determine the historical clutch collection position data of the collection cycle before the current collection time; Determining the initial clutch position according to the historical clutch position data; When the untrusted state is not the first untrusted state, historical clutch estimated position data at a moment before the current acquisition moment is acquired to determine the initial clutch position. 6. The method for processing AMT degradation based on clutch position according to claim 1, characterized in that the clutch is open-loop controlled according to the real-time clutch estimated position data and a preset duty cycle control strategy, specifically comprising: Determining target operation information of the clutch according to the real-time clutch estimated position data and the clutch target position data, wherein the target operation information includes a target operation mode and a target operation range, the target operation mode includes any one of clutch disengagement and clutch engagement, and the target operation range includes full-range operation and non-full-range operation; Determining a corresponding clutch actuator to be operated according to the target operation mode in the target operation information, wherein the clutch actuator to be operated includes any one or more of a clutch release fast valve, a clutch release slow valve, a clutch engagement fast valve and a clutch engagement slow valve; Determining a duty cycle to be adjusted of the clutch actuator to be operated according to the target operation range and the duty cycle control strategy in the target operation information; The clutch is open-loop controlled by the duty cycle to be adjusted. 7. The method for processing AMT degradation based on clutch position according to claim 6, characterized in that the corresponding clutch actuator to be operated is determined according to the target operation mode in the target operation information, specifically comprising: When the target operation mode is clutch separation, determining that the clutch actuator to be operated is the clutch separation fast valve and the clutch separation slow valve; When the target operation mode is clutch engagement, determining that the clutch actuator to be operated is the clutch engagement fast valve and the clutch engagement slow valve; Determining the duty cycle to be adjusted of the clutch actuator to be operated according to the target operation range and the duty cycle control strategy in the target operation information specifically includes: When the target operating range is full-range operation, determining the to-be-operated clutch actuator's to-be-operated duty cycle to be adjusted to be a preset first duty cycle; When the target operating range is not the full-range operation, the to-be-operated clutch actuator's to-be-operated duty cycle is determined to be a preset second duty cycle. 8. The method for processing AMT degradation based on clutch position according to claim 7, characterized in that the clutch is open-loop controlled by the duty cycle to be adjusted, specifically comprising: When the target operating range is not the full range operation, the preset second duty ratio is used to control the actuator of the clutch to be operated, and the current clutch estimated position of the clutch is determined by the preset second duty ratio; When the difference between the current clutch estimated position and the clutch target position data is not greater than a preset threshold, the actuator of the clutch to be operated is adjusted to zero. 9. An AMT degradation processing device based on clutch position, characterized in that the device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: Collecting real-time clutch position data collected by a clutch position sensor, performing position credibility analysis on the clutch through the real-time clutch position data, and determining a clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an uncredible state; When the clutch position credible state is the untrustworthy state, determining real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; According to the real-time clutch estimated position data and the preset duty cycle control strategy, the clutch is open-loop controlled to achieve AMT degradation processing. 10. A non-volatile computer storage medium storing computer executable instructions, wherein the computer executable instructions are configured as follows: Collecting real-time clutch position data collected by a clutch position sensor, performing position credibility analysis on the clutch through the real-time clutch position data, and determining a clutch position credibility state corresponding to the clutch position sensor, wherein the clutch position credibility state includes a credibility state and an uncredible state; When the clutch position credible state is the untrustworthy state, determining real-time clutch estimated position data according to a pre-built clutch position estimation model and pre-acquired clutch target position data; According to the real-time clutch estimated position data and the preset duty cycle control strategy, the clutch is open-loop controlled to achieve AMT degradation processing.