Vehicle shift method and vehicle shift system

Abstract

This invention provides a vehicle gear shifting method and a vehicle gear shifting system. In this method, under predetermined conditions where the absolute value of the difference between the first slope of the change curve of the pulse width modulation signal value of the full gear position sensor and the second slope of the change curve of the pulse width modulation signal value of the gear shift intention sensor is less than or equal to a first predetermined value, and the absolute value of the slope of the change curve of the pulse width modulation signal value of the full gear position sensor is greater than or equal to a second predetermined value, a gear shift trigger point is determined based on the pulse width modulation signal value of the gear shift intention sensor when the predetermined conditions are triggered, or based on the moment when the predetermined conditions are triggered. At the gear shift trigger point, the vehicle's clutch is disengaged. Thus, for different vehicles, this method avoids the problem of inconsistent gear shift intention determination for different vehicles using conventional methods, and overcomes the problem of deteriorated gear shifting performance due to reading errors and wear of various components.

Description

Technical Field

[0001] This invention relates to the field of vehicle gear shifting, and more specifically to a vehicle gear shifting method and a vehicle gear shifting system employing the same method. Background Technology

[0002] In existing vehicle shifting systems that include an electronic clutch, the shifting system comprises a full-gear position sensor and a shift intention sensor. The full-gear position sensor is located in the shift tower mechanism of the transmission to sense whether the gear is in a neutral or engaged state. The shift intention sensor is located in the shift lever mechanism to sense the driver's shifting intention, thereby feeding back the shifting intention to the shifting system so that the shifting system can control the disengagement of the electronic clutch.

[0003] Figure 1 The diagram illustrates the changes in various parameters of the aforementioned vehicle's gear shifting system over time during the gear shifting process. Figure 1 In the top-to-bottom arrangement, the first coordinate system represents the change of the pulse width modulation signal of the shift intention sensor over time during the shifting process; the second coordinate system represents the change of the pulse width modulation signal of the full gear sensor over time during the shifting process; the third coordinate system represents the change of engine speed over time during the shifting process; and the fourth coordinate system represents the change of engine torque and clutch torque over time during the shifting process. Figure 1 It is known that after the shift intention sensor recognizes the driver's shift intention, the shift system controls the electronic clutch to disengage. After the electronic clutch disengages, the shift system engages the corresponding gear. From a driving performance perspective, a suitable interval Δt must be defined between the shift intention sensor sensing the shift intention and the change in the state of the gear to maintain good shift performance.

[0004] However, existing learning strategies rely on signals from a full-gear sensor and a shift intention sensor. These two sensors are calibrated at the end of the production line, and their signals are continuously compared during vehicle operation to determine the shift intention trigger point. This shifting method may have the following problems.

[0005] 1. Poor consistency in shift intention performance across different vehicles. This is due to the system rigidity and mechanical structural tolerances of the shift system. At the end of the production line, different gear learning methods are used to learn different full-gear position sensors and shift intention sensors, resulting in different positions for the calibrated full-gear position sensors and shift intention sensors. Therefore, some vehicles are sensitive to shift intentions, while others are less sensitive.

[0006] 2. Because the vehicle's shift lever mechanism and the transmission, including the shift tower mechanism, are not rigidly connected, the readings of the full gear position sensor and the shift intention sensor may differ when the shift lever mechanism and shift tower mechanism are in motion. If the difference between these two readings exceeds a preset threshold, a shift is triggered, which may cause problems. Furthermore, wear and tear on various components can cause variations in the readings of the full gear position sensor and the shift intention sensor, which can also lead to a deterioration in shifting performance. Summary of the Invention

[0007] The present invention was made in view of the deficiencies of the prior art. The object of the present invention is to provide a new vehicle shifting method that can ensure the consistency of shifting performance across various vehicles as much as possible and reduce problems such as reading errors and performance degradation caused by wear and tear of components. Another object of the present invention is to provide a vehicle shifting system employing the above-described vehicle shifting method.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution.

[0009] The present invention provides a vehicle shifting method wherein the absolute value of the difference between the first slope of the change curve of the signal value of the full gear position sensor of the vehicle and the second slope of the change curve of the signal value of the shift intention sensor of the vehicle is less than or equal to a first predetermined value and the absolute value of the second slope is greater than or equal to a second predetermined value is a predetermined condition. A shift trigger point is determined based on the signal value of the shift intention sensor when the predetermined condition is triggered or based on the time value when the predetermined condition is triggered, and the clutch of the vehicle begins to disengage at the shift trigger point.

[0010] The signal values ​​of the full gear position sensor and the shift intention sensor are selected as pulse width modulation signal values; of course, other modulation forms of output signal types can also be used.

[0011] Preferably, the first predetermined value is greater than or equal to 0 and the second predetermined value is greater than 0.

[0012] More preferably, the shift trigger point is determined by the sum of the pulse width modulation signal value of the shift intention sensor and a third predetermined value when the aforementioned predetermined conditions are triggered.

[0013] More preferably, the shift trigger point is determined by the sum of the time when the aforementioned predetermined condition is triggered and the fourth predetermined value.

[0014] More preferably, the fourth predetermined value is either positive or negative.

[0015] More preferably, after a predetermined number of gear shifting processes, the gear shift trigger point is redefined.

[0016] More preferably, the predetermined number of times is not less than 1000 times.

[0017] The present invention also provides a vehicle shifting system, wherein the vehicle shifting system adopts the shifting method described in any one of the above technical solutions.

[0018] Preferably, the shifting system includes an electronic clutch as the clutch.

[0019] By adopting the above technical solution, the present invention provides a novel vehicle gear shifting method. Under predetermined conditions, where the absolute value of the difference between the first slope of the change curve of the pulse width modulation signal value of the full gear position sensor and the second slope of the change curve of the pulse width modulation signal value of the gear shift intention sensor is less than or equal to a first predetermined value, and the absolute value of the slope of the change curve of the pulse width modulation signal value of the full gear position sensor is greater than or equal to a second predetermined value, the pulse width modulation signal values ​​of the full gear position sensor and the gear shift intention sensor are recorded under these predetermined conditions. A gear shift trigger point is determined based on the pulse width modulation signal value of the gear shift intention sensor when the predetermined conditions are triggered, or based on the moment when the predetermined conditions are triggered. At the gear shift trigger point, the vehicle's clutch is disengaged. Thus, for different vehicles, the gear shift trigger point determined by the method according to the present invention avoids the problem of poor consistency in determining the gear shift intention for different vehicles using conventional methods. Furthermore, this method can overcome the problem of deteriorated gear shifting performance due to reading errors and wear of various components. Attached Figure Description

[0020] Figure 1 It shows the state of various parameters of the vehicle's shift system as a function of time during the shifting process.

[0021] Figure 2 This is an explanatory diagram illustrating the vehicle shifting method according to the present invention, showing curves of how each parameter changes over time. Detailed Implementation

[0022] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement the invention, and are not intended to exhaustively describe all possible embodiments of the invention, nor to limit the scope of the invention. The vehicle gear shifting method according to the present invention will now be described in conjunction with the accompanying drawings.

[0023] Figure 2This is an explanatory diagram illustrating the vehicle shifting method according to the present invention. In a top-down arrangement, the first coordinate system represents the state of change of the pulse width modulation signal of the shift intention sensor and the pulse width modulation signal of the full gear position sensor over time; the second coordinate system represents the state of change of the slope of the change curve of the pulse width modulation signal of the shift intention sensor and the slope of the change curve of the pulse width modulation signal of the full gear position sensor over time, wherein the slope of the change curve of the pulse width modulation signal of the shift intention sensor in the second coordinate system can be obtained by differentiating the curve of the change curve of the pulse width modulation signal of the shift intention sensor in the first coordinate system over time, and the slope of the change curve of the pulse width modulation signal of the full gear position sensor in the second coordinate system can be obtained by differentiating the curve of the change curve of the pulse width modulation signal of the shift intention sensor in the first coordinate system over time; the third coordinate system represents the state of change of the difference between the slope of the change curve of the pulse width modulation signal of the shift intention sensor and the slope of the change curve of the pulse width modulation signal of the full gear position sensor over time.

[0024] To eliminate the influence of system rigidity and mechanical structural tolerances in the shifting system on the accuracy of sensing the driver's shifting intention, the shifting method of the present invention determines whether the driver actually has a shifting intention by measuring the change in the pulse width modulation signal value of the full gear position sensor, and determines the clutch disengagement trigger point of the shifting system by comparing the difference between the slope of the change curve of the pulse width modulation signal value of the full gear position sensor and the slope of the change curve of the pulse width modulation signal value of the shifting intention sensor.

[0025] Specifically, a predetermined condition is established that the absolute value of the difference between the slope of the change curve of the pulse width modulation signal value of the shift intention sensor (first slope) and the slope of the change curve of the pulse width modulation signal value of the full gear position sensor (second slope) is less than or equal to a first predetermined value, and the absolute value of the second slope is greater than or equal to a second predetermined value. A shift trigger point is determined based on the pulse width modulation signal value of the shift intention sensor when the predetermined condition is triggered, or based on the time value when the predetermined condition is triggered. At the shift trigger point, the vehicle's clutch begins to disengage. In this embodiment, the first predetermined value can be slightly greater than 0 or 0. When the first predetermined value is 0, it indicates that the first slope and the second slope are the same. The second predetermined value is greater than 0, and both the first and second predetermined values ​​are adjustable empirical values.

[0026] When the shift trigger point is determined based on the aforementioned predetermined conditions, it can be more accurately determined using the pulse modulation signal parameters or time parameters of the shift intention sensor. On one hand, the shift trigger point can be determined by the sum of the pulse width modulation signal value of the shift intention sensor at the time the predetermined conditions are triggered and a third predetermined value, where the third predetermined value is a correction value for the pulse width modulation signal. This allows setting a predetermined time before the aforementioned predetermined conditions are met as the shift trigger point. On the other hand, the shift trigger point can be determined by the sum of the time when the aforementioned predetermined conditions are triggered and a fourth predetermined value, where the fourth predetermined value can be positive or negative. This allows setting a predetermined time before or after the aforementioned conditions are met as the shift trigger point. Both the first and second predetermined values ​​are adjustable empirical values.

[0027] In this way, after performing a shift cycle using the above method (e.g., shifting from 3rd gear to 4th gear), the shift intention sensor and the full gear sensor can learn accordingly, thereby ensuring effective shifting operations within a certain period of vehicle operation and guaranteeing shifting performance.

[0028] Furthermore, it should be understood that after a period of vehicle use, the wear and tear of various components causes the shift trigger point to change, thus requiring a re-determination of the shift trigger point. Preferably, the shift trigger point is re-determined after a predetermined number of shift cycles of not less than 1000. Of course, it can also be set to re-determine the shift trigger point after a predetermined period of vehicle use.

[0029] In addition, the present invention also provides a vehicle shifting system, which includes a shift lever mechanism, a transmission (including gears, shift tower, shift fork, etc.), multiple sensors (including shift intention sensor or full gear sensor, etc.) and an electronic clutch.

[0030] In summary, the present invention provides a vehicle gear shifting method and a vehicle gear shifting system, which are not limited to the examples listed in the above specific embodiments, and the following supplementary description is provided.

[0031] (i) Although not explicitly stated in the above specific embodiments, it should be understood that the shift intention sensor may be a sensor that senses the displacement of the shift lever or the rotation angle of the shift lever, and the shift intention sensor may be a Hall sensor.

[0032] (ii) By employing the method according to the present invention, the vehicle can automatically learn the shift intention trigger point and ensure the consistency of shift intention performance of various vehicles; moreover, by employing the method according to the present invention, the vehicle can continuously update (adaptively) the shift intention trigger point throughout its service life.

[0033] (iii) Although not explicitly stated in the above specific technical solutions, it should be understood that the change curve of the pulse width modulation signal value when shifting between different gears is different from the change curve of the pulse width modulation signal value of the shift intention sensor, but the inventive concept of this application can be used to determine the shift trigger point.

[0034] (iv) Although pulse width modulation signals are used for the signals of the full gear sensor and the shift intention sensor in the above specific technical solutions, it is clear that the method of the present invention can also be used for other modulation types or output types of signals of the full gear sensor and the shift intention sensor.

[0035] Furthermore, regarding the selection of the shift trigger point, although there may be multiple points that satisfy the predetermined conditions of the inventive concept of this application, the first point that satisfies the predetermined conditions after confirming that the driver indeed intends to shift gears should be selected as the shift trigger point. Moreover, after determining the shift trigger point multiple times using the inventive concept of this invention, a more reasonable shift trigger point can be determined using an appropriate average weighting algorithm.

Claims

1. A vehicle shift method characterized by, An absolute value of a difference between a first slope of a change curve of a signal of an all-range sensor of the vehicle and a second slope of a change curve of a signal of a shift intention sensor of the vehicle is less than or equal to a first predetermined value and an absolute value of the second slope is greater than or equal to a second predetermined value is a predetermined condition, a shift trigger point at which a clutch of the vehicle starts to be separated is determined based on a signal value of the shift intention sensor when the predetermined condition is triggered or based on a time value at which the predetermined condition is triggered.

2. The vehicle shifting method of claim 1, wherein, The first predetermined value is greater than or equal to 0 and the second predetermined value is greater than 0.

3. The vehicle shifting method of claim 1, wherein, The shift trigger point is determined by a sum of the signal value of the shift intention sensor when the predetermined condition is triggered and a third predetermined value.

4. The vehicle shifting method of claim 1, wherein, The shift trigger point is determined by a sum of the time at which the predetermined condition is triggered and a fourth predetermined value.

5. The vehicle shifting method of claim 4, wherein, The fourth predetermined value is a positive value or a negative value.

6. The vehicle shifting method according to any one of claims 1 to 5, characterized by, The shift trigger point is re-determined after a predetermined number of shift processes.

7. The vehicle shifting method of claim 6, wherein, The predetermined number is not less than 1000.

8. The vehicle shifting method of claim 1, wherein, The signal of the all-range sensor and the signal of the shift intention sensor are pulse width modulation signals.

9. A shift system for a vehicle, characterized by comprising: The shift system for the vehicle adopts the shift method according to any one of claims 1 to 8.

10. The shift system for a vehicle according to claim 9, characterized by The shift system includes an electronic clutch as the clutch.

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