Synchronizer position fault simulation method of transmission

Abstract

The invention discloses a synchronizer position fault simulation method for a transmission, and the method comprises the steps: enabling the size of an electric signal actually received by a transmission controller to be changed through changing the resistance value of a transmission line based on the influence of the resistance value of the transmission line on the size of the electric signal actually received by the transmission controller; therefore, the transmission controller can judge the position fault of the synchronizer under the condition that the actual position of the synchronizer is normal, and the position fault of the synchronizer is simulated so as to test whether the processing of the transmission controller after the position fault of the synchronizer is reasonable or not. According to the method, actually damaged parts of the transmission do not need to be replaced for testing, operation is easy, implementation is easy, the synchronizer position fault simulation testing cost can be effectively reduced, the processing reasonability of a transmission controller after the synchronizer position fault can be well verified, and acceptance inspection under the fault working condition is achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method for simulating synchronizer position faults of a transmission. Background Art

[0002] For a transmission that includes a synchronizer, the synchronizer directly affects the actual gear output of the transmission, so the transmission controller needs to perform precise logical control of the position of the synchronizer, and when the position of the synchronizer fails, the transmission controller needs to perform corresponding processing operations.

[0003] In order to verify whether the transmission controller handles the situation normally when a synchronizer position fault occurs, in the related art, the transmission is tested by directly replacing the actually damaged parts. Different parts need to be replaced for different synchronizer position faults, so the workload is relatively large. Moreover, many position fault types need to be inspected during vehicle driving. The method of replacing the actually damaged parts has low operational feasibility. Summary of the invention

[0004] In order to solve the above problems, the present application provides a method for simulating synchronizer position fault of a transmission.

[0005] The present application discloses a method for simulating a synchronizer position fault of a transmission, the method comprising:

[0006] Based on the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position;

[0007] The electrical signal received by the transmission controller is configured according to the fault location.

[0008] In an exemplary embodiment, the transmission is provided with a position sensor, which is used to detect the position information of the synchronizer and output it to the transmission controller in the form of an electrical signal through a transmission line; the electrical signal received by the transmission controller is configured according to the fault position, including:

[0009] The resistance value of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position.

[0010] In an exemplary embodiment, before selecting a position other than a normal position of the synchronizer as a fault position based on the synchronizer position fault to be simulated, the method further includes:

[0011] Connecting an adjustable resistor in series between the transmission controller and the position sensor to obtain the transmission line with adjustable resistance;

[0012] Then, configuring the resistance of the transmission line according to the fault location includes:

[0013] The resistance value of the adjustable resistor is adjusted according to the fault location to adjust the resistance value of the transmission line.

[0014] In an exemplary embodiment, configuring the resistance of the transmission line according to the fault location includes:

[0015] determining a target resistance value of the transmission line based on the fault location, the target resistance value being used to make the electrical signal received by the transmission controller correspond to the fault location;

[0016] The resistance of the transmission line is configured to be the target resistance.

[0017] In an exemplary embodiment, the synchronizer position fault includes at least one of gear position abnormality, gear shift failure, gear shift failure, and position over-limit, wherein the gear position abnormality refers to that the position of the synchronizer is outside the normal position corresponding to the current gear, and the position over-limit refers to that the position of the synchronizer exceeds the preset limit position, and the limit position is a position outside the position corresponding to the gear position abnormality.

[0018] In an exemplary embodiment, when the synchronizer position fault is any one of a gear position abnormality, a gear disengagement failure, and a gear engagement failure, wherein the gear position abnormality is that the position of the synchronizer is outside the normal position corresponding to the current gear; when the resistance value of the transmission line is configured according to the fault position, the state of the transmission is also controlled to correspond to the synchronizer position fault that needs to be simulated.

[0019] In an exemplary embodiment, when the synchronizer position fault is an abnormal gear position, the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position, includes:

[0020] Determining a normal position corresponding to the synchronizer based on the gear position currently requiring fault simulation;

[0021] According to the normal position corresponding to the synchronizer, selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer;

[0022] The controlling the state of the transmission to correspond to the synchronizer position fault currently required to be simulated includes:

[0023] The transmission is controlled to be the gear that currently requires fault simulation.

[0024] In an exemplary embodiment, when the synchronizer position fault is a gear-shift failure or a gear-shift failure, the state of the transmission is controlled to correspond to the synchronizer position fault to be simulated, including:

[0025] Based on the predetermined disengaging gear position or engaging gear position, the transmission is controlled to perform a corresponding gear shifting operation.

[0026] In an exemplary embodiment, when the synchronizer position fault is a gear-engagement failure, the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position, includes:

[0027] Determining a normal position corresponding to the synchronizer based on the gear position currently required to be engaged;

[0028] According to the normal position corresponding to the synchronizer, selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer;

[0029] When the synchronizer position fault is a failure to disengage gears, the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position, includes:

[0030] Determining the gear position corresponding to the synchronizer based on the gear position currently requiring the gear to be disengaged;

[0031] The gear position is used as the fault position of the synchronizer.

[0032] In an exemplary embodiment, when the synchronizer position fault is a position over-limit, the position over-limit means that the position of the synchronizer exceeds a preset limit position, and the step of configuring the resistance of the transmission line according to the fault position includes:

[0033] The resistance of the transmission line is configured to be a maximum value.

[0034] In an exemplary embodiment, the transmission controller has a voltage output terminal and a current receiving terminal, the position sensor has a first input terminal and a first output terminal, the voltage output terminal outputs a preset voltage signal to the first input terminal, the internal resistance of the position sensor is determined based on its position, and the first output terminal is connected to the current receiving terminal through the transmission line to output position information to the transmission controller through the transmission line.

[0035] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0036] The synchronizer position fault simulation method of the transmission provided in the present application configures the size of the electrical signal actually received by the transmission controller based on the synchronizer position fault to be simulated, so that the transmission controller can judge that it is a synchronizer position fault when the actual position of the synchronizer is normal, and realizes the simulation of the synchronizer position fault to test whether the processing of the transmission controller after the synchronizer position fault is reasonable. This method does not need to replace the actual damaged parts of the transmission for testing, is simple to operate, easy to implement, and can effectively reduce the cost of synchronizer position fault simulation testing.

[0037] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0039] Figure 1 A schematic diagram schematically shows a partial component diagram of a vehicle system provided in an embodiment of the present application.

[0040] Figure 2 The schematic diagram of the synchronizer position detection principle provided in an embodiment of the present application is schematically shown.

[0041] Figure 3 A synchronizer position fault simulation test logic diagram of a transmission provided in an embodiment of the present application is schematically shown.

[0042] Figure 4 A flow chart of a method for simulating synchronizer position fault of a transmission provided in an embodiment of the present application is schematically shown.

[0043] Figure 5 A flow chart of a method for simulating synchronizer position fault of a transmission provided in another embodiment of the present application is schematically shown.

[0044] Figure 6 The figure schematically shows the relationship between the gear position and the synchronizer position provided in one embodiment of the present application.

[0045] The following are the descriptions of the reference numerals:

[0046] 101. Transmission; 102. Position sensor; 1021. First input terminal; 1022. First output terminal; 103. Synchronizer; 104. Transmission controller; 1041. Signal output terminal; 1042. Signal receiving terminal; 105. Transmission line; 106. Wire. DETAILED DESCRIPTION

[0047] Although the present application can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the present application and is not intended to limit the present application to that described herein.

[0048] The terms "include", "comprising", "having" and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or modules is not limited to the listed steps or modules, but may optionally include other steps or modules not listed, or may optionally include other steps or modules inherent to these processes, methods, products or devices.

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0050] OBD (On-Board Diagnostic) is an online diagnostic system used in automobiles to monitor vehicle conditions and control emissions. When a related component on a car fails, OBD will detect the fault and store the corresponding fault code in the onboard computer so that maintenance personnel can quickly and accurately determine the nature and location of the fault, and light up the malfunction indicator (MIL).

[0051] In the OBD diagnosis of the transmission, the main fault factor is the gear shifting performance of the transmission. For the wet dual-clutch transmission and other transmissions that contain synchronizers, the main components that affect the gear shift are the clutch and synchronizer, among which the synchronizer will directly affect the actual gear output of the transmission. Therefore, the transmission controller (TCU, Transmission Control Unit) needs to perform precise logical control of the synchronizer position, and at the same time, when the synchronizer position fails, corresponding processing operations need to be performed. In order to verify the rationality of the transmission controller's processing after the synchronizer position failure, a synchronizer position failure simulation test is required.

[0052] In the related art, when simulating synchronizer position faults, the actual damaged parts of the transmission are directly replaced, which is a large workload. In addition, for different synchronizer position faults, the parts that need to be replaced will also be different, making synchronizer position fault testing difficult. In addition, many types of position faults need to be tested while the vehicle is driving, and the method of replacing the actual damaged parts is not feasible.

[0053] To this end, the present application provides a method for simulating synchronizer position faults of a transmission to solve the problems of large workload and low operational feasibility of synchronizer position fault simulation testing.

[0054] Figure 1 A schematic diagram of a part of the components of a vehicle system provided by an embodiment of the present application is shown schematically. Figure 1 As shown, the transmission 101 is provided with a position sensor 102, which is used to detect the position information of the synchronizer 103, and the position sensor 102 outputs the position information in the form of an electrical signal. The position sensor 102 and the transmission controller 104 are connected via a transmission line 105, and the position sensor 102 outputs the position information of the synchronizer 103 to the transmission controller 104 in the form of an electrical signal via the transmission line 105. The transmission controller 104 analyzes and processes the received electrical signal to obtain the position information of the synchronizer 103.

[0055] The synchronizer position fault simulation method for a transmission provided in the present application selects a position other than the normal position of the synchronizer as the fault position based on the synchronizer position fault to be simulated, and then configures the electrical signal received by the transmission controller according to the fault position, so that the transmission controller can determine that it is a synchronizer position fault when the actual position of the synchronizer is normal, thereby realizing the simulation of the synchronizer position fault to test whether the processing of the transmission controller after the synchronizer position fault is reasonable.

[0056] Therein, configuring the electrical signal received by the transmission controller according to the fault location can be achieved in a variety of ways.

[0057] For example, in one embodiment, the connection between the transmission controller and the position sensor is cut off, the transmission controller is connected to an analog signal source, and the analog signal source is configured to output an electrical signal to the transmission controller according to the fault position, so that the electrical signal received by the transmission controller corresponds to the fault position. The analog signal source can be a voltage source, and the voltage output by the voltage source to the transmission controller is configured according to the fault position, so that the voltage received by the transmission controller corresponds to the fault position. The analog signal source can also be a current source, and the current output by the current source to the transmission controller is configured according to the fault position, so that the current received by the transmission controller corresponds to the fault position.

[0058] For example, in one embodiment, the connection between the transmission controller and the position sensor is maintained, and the transmission line 105 is connected to the analog signal source, which can be the end of the transmission line 105 connected to the position sensor connected to the analog signal source, or the end of the transmission line 105 connected to the transmission controller connected to the analog signal source, and then the analog signal source is configured according to the fault position to output the electrical signal to the transmission controller, so that the electrical signal received by the transmission controller corresponds to the fault position. As mentioned above, the analog signal source can be a voltage source or a current source.

[0059] For example, in one embodiment, the resistance of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position. Below, this application is described in detail mainly by taking this implementation as an example.

[0060] like Figure 2 As shown, the transmission controller 104 has a signal output terminal 1041 and a signal receiving terminal 1042, the position sensor 102 has a first input terminal 1021 and a first output terminal 1022, and the position sensor 102 has an internal resistance, and the internal resistance of the position sensor 102 is determined based on its position. The transmission controller 104 outputs a preset electrical signal through the signal output terminal 1041, and the preset electrical signal is transmitted to the first input terminal 1021 of the position sensor 102 through the wire 106. In the position sensor 102, the electrical signal is output through the first output terminal 1022 after passing through the internal resistance, and then reaches the signal receiving terminal 1042 through the transmission line 105. That is, the signal output terminal 1041, the wire 106, the first input terminal 1021, the internal resistance of the position sensor, the first output terminal 1022, the transmission line 105, and the signal receiving terminal 1042 are connected in series in sequence to form a loop.

[0061] In detail, the signal output terminal 1041 may be a voltage output terminal, and the signal receiving terminal 1042 may be a current receiving terminal. Accordingly, the preset electrical signal is a preset voltage signal, and the electrical signal received by the signal receiving terminal 1042 is a current signal. The magnitude of the current signal actually received by the transmission controller 104 is related to the internal resistance of the position sensor 102 and the resistance of the transmission line 105. When the internal resistance of the position sensor 102 is fixed, if the resistance of the transmission line 105 is maintained at a specific resistance value, the current signal received by the transmission controller 104 corresponds to the internal resistance of the position sensor 102, that is, corresponds to the position of the synchronizer 103; when the resistance of the transmission line 105 is increased, the current signal actually received by the transmission controller 104 will become smaller; when the resistance of the transmission line 105 is reduced, the current signal actually received by the transmission controller 104 will become larger.

[0062] Of course, the signal output terminal 1041 is not limited to being a voltage output terminal, that is, the preset electrical signal is not limited to being a preset voltage signal, and the signal receiving terminal 1042 is not limited to being a current receiving terminal. For example, the signal output terminal 1041 is a current output terminal, and the signal receiving terminal 1042 is a voltage receiving terminal. Accordingly, the preset electrical signal is a preset current signal. When the resistance of the transmission line 105 is increased, the voltage boost generated by the transmission line 105 increases, which will cause the voltage signal actually received by the transmission controller 104 to increase; when the resistance of the transmission line 105 is reduced, the voltage boost generated by the transmission line 105 decreases, which will cause the voltage signal actually received by the transmission controller 104 to decrease.

[0063] In one embodiment of the present application, based on the influence of the resistance of the transmission line on the size of the electrical signal actually received by the transmission controller, the size of the electrical signal actually received by the transmission controller is changed by changing the resistance of the transmission line, so that the transmission controller can judge that the synchronizer position is faulty when the actual position of the synchronizer is normal, and simulate the synchronizer position fault to test whether the transmission controller's processing after the synchronizer position fault is reasonable. This method does not require the transmission to replace the actual damaged parts for testing, is simple to operate, easy to implement, can effectively reduce the cost of synchronizer position fault simulation testing, can better verify the rationality of the transmission controller's processing after the synchronizer position fault, and realize acceptance under fault conditions.

[0064] The synchronizer position failure may be abnormal gear position, failure to disengage gear, failure to engage gear, position over-limit, etc. The abnormal gear position means that the synchronizer position is outside the normal position corresponding to the current gear, and the position over-limit means that the synchronizer position exceeds the preset limit position. It can be understood that the limit position is a position outside the position corresponding to the abnormal gear position.

[0065] Before conducting a transmission synchronizer position fault simulation test, the synchronizer position fault that needs to be simulated must be determined first, such as gear position abnormality (gear position abnormality can be divided into in-gear position abnormality and neutral position abnormality), gear shift failure, gear engagement failure, position overlimit, etc., and then based on the synchronizer position fault that needs to be simulated, determine the corresponding fault position of the synchronizer, and then use a signal interference device to adjust the resistance of the transmission line according to the fault position, so that the resistance of the transmission line corresponds to the fault position, and the electrical signal when the synchronizer actually has a position fault is simulated; at the same time, the transmission controller also needs to control the state of the transmission based on the synchronizer position fault that needs to be simulated, that is, the state of the vehicle. In this process, the vehicle signal will not be affected by the synchronizer position fault simulation test, and the transmission controller will perform corresponding processing operations (output corresponding control signals) based on the synchronizer position fault. The logic diagram of the transmission synchronizer position fault simulation test is as follows: Figure 3 shown.

[0066] Below, a method for simulating synchronizer position fault of a transmission according to an embodiment of the present application is described in detail with reference to the accompanying drawings.

[0067] Figure 4 A flowchart of a method for simulating synchronizer position fault of a transmission provided by an embodiment of the present application is schematically shown. Figure 4 As shown, the method for simulating the synchronizer position fault of the transmission provided in the embodiment of the present application includes steps S410 to S420, which are specifically as follows:

[0068] In step S410 , based on the synchronizer position fault to be simulated, a position other than the normal position of the synchronizer is selected as the fault position.

[0069] Among them, the synchronizer position fault that needs to be simulated may be an abnormal gear position. For example, the gears of the transmission may include R (Reverse), N (Neutral), P (Parking), D (Drive), etc. The forward gear may include multiple gears, such as D1 to D7. When the target gear that the transmission actually needs to output changes, the position of the synchronizer changes accordingly. When the synchronizer is in the position corresponding to the target gear, it is a normal position. When the synchronizer is in a position other than the normal position corresponding to the target gear, a gear position fault has occurred.

[0070] The synchronizer position fault that needs to be simulated can be a position overrun, where the position overrun means that the synchronizer position exceeds the preset limit position. At this time, problems such as component collision are likely to occur inside the transmission. It can be understood that the gear position abnormality is different from the position overrun. The gear position abnormality is a position fault outside the limit position range of the synchronizer. For example, the limit positions of the synchronizer are the 5% position and the 95% position. When the synchronizer position is below the 5% position and above the 95% position, it is a position overrun, and the position fault within the range of the 5% position to the 95% position will be a gear position abnormality. Among them, the 5% position and the 95% position refer to the position of the synchronizer relative to the shift fork, where the 0% position and the 100% position correspond to the two opposite ends of the shift fork, respectively.

[0071] The synchronizer position fault that needs to be simulated can be a gear disengagement failure, that is, when shifting gears, the synchronizer still remains in the position corresponding to the gear that needs to be disengaged. The synchronizer position fault that needs to be simulated can also be a gear engagement failure, that is, when shifting gears, the synchronizer does not switch to the position corresponding to the gear that needs to be engaged.

[0072] In one embodiment of the present application, the synchronizer position fault is a gear position abnormality, and step S410 includes: determining the normal position corresponding to the synchronizer based on the gear position that currently needs fault simulation; and selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer according to the normal position corresponding to the synchronizer. In this way, the acquisition of the fault position corresponding to the synchronizer under the gear position abnormality fault simulation is realized, and the logic is simple and easy to implement.

[0073] Among them, the gears that currently need fault simulation are, for example, D1 gear, D4 gear, D7 gear, R gear, neutral gear, etc. In the process of performing synchronizer position fault simulation test, the gear position abnormality simulation can be performed on multiple gears in sequence to verify the rationality of the transmission controller's processing after different gear position abnormality faults.

[0074] In one embodiment of the present application, the synchronizer position fault is position overrun, and step S410 includes: determining the position range allowed by the synchronizer, at which time, the position range allowed by the synchronizer is the normal position of the synchronizer; according to the position range allowed by the synchronizer, selecting a position outside the position range allowed by the synchronizer as the corresponding fault position of the synchronizer. In this way, the acquisition of the fault position corresponding to the synchronizer under the position overrun fault simulation is realized, and the logic is simple and easy to implement.

[0075] Exemplarily, the position range allowed by the synchronizer is from the 5% position to the 95% position, and the corresponding fault position of the synchronizer is below the 5% position and above the 95% position.

[0076] In one embodiment of the present application, the synchronizer position fault is a gear engagement failure, and step S410 includes: determining the normal position corresponding to the synchronizer based on the gear engagement position that currently needs to be engaged; and selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer according to the normal position corresponding to the synchronizer. In this way, the acquisition of the fault position corresponding to the synchronizer under the gear engagement failure fault simulation is realized, and the logic is simple and easy to implement.

[0077] In one embodiment of the present application, the synchronizer position fault is a gear disengagement failure, and step S410 includes: determining the gear position corresponding to the synchronizer based on the gear disengagement gear that currently needs to be disengaged; and using the gear position as the synchronizer fault position. In this way, the synchronizer fault position corresponding to the gear disengagement failure fault simulation is obtained, and the logic is simple and easy to implement.

[0078] In step S420, the resistance of the transmission line is configured according to the fault location so that the electrical signal received by the transmission controller corresponds to the fault location.

[0079] That is, based on the mapping relationship between the fault position and the resistance of the transmission line, the resistance of the transmission line is adjusted so that the electrical signal actually received by the transmission controller corresponds to the fault position selected in step S410.

[0080] In one embodiment of the present application, before executing step S410, an adjustable resistor is first connected in series between the transmission controller and the position sensor to obtain a transmission line with adjustable resistance. In step S420, the resistance value of the adjustable resistor is adjusted according to the fault position to adjust the resistance value of the transmission line so that the electrical signal received by the transmission controller corresponds to the fault position. By connecting the adjustable resistor in series between the transmission controller and the position sensor to obtain a transmission line with adjustable resistance, the resistance value of the transmission line can be adjusted by adjusting the resistance value of the adjustable resistor, and the resistance value adjustment of the transmission line is simple.

[0081] In detail, the output end of the position sensor can be connected to an external output port provided on the gearbox of the transmission, and the transmission controller has an input port. The input port of the transmission controller is connected to the aforementioned external output port through a transmission line, and the transmission line is pluggable between the external output port and the input port of the transmission controller. In the case where there is no need to perform a synchronizer position fault simulation test, the transmission line is a transmission line with a non-adjustable resistance, and the position sensor outputs position information to the transmission controller in the form of an electrical signal through the transmission line with a non-adjustable resistance. In the case of a synchronizer position fault simulation test, the transmission line with a non-adjustable resistance is unplugged from the external output port and the input port of the transmission controller, and the transmission line connected with an adjustable resistor is connected in series between the external output port and the input port of the transmission controller, thereby obtaining a transmission line with adjustable resistance.

[0082] In addition, the aforementioned transmission line with non-adjustable resistance may also include two sub-transmission lines, which are pluggably connected together through a connector, wherein one sub-transmission line is connected to the input port of the transmission controller, and the other sub-transmission line is connected to the aforementioned external output port. In the case where there is no need to perform a synchronizer position fault simulation test, the two sub-transmission lines are connected together through a connector. In the case of a synchronizer position fault simulation test, the two sub-transmission lines are disconnected from the connector, and an adjustable resistor is connected in series between the two sub-transmission lines, so that an adjustable resistor is connected in series between the transmission controller and the position sensor, thereby obtaining a transmission line with adjustable resistance.

[0083] The adjustable resistor may be an adjustable resistor whose resistance value can be adjusted manually; the adjustable resistor may also be an adjustable resistor whose resistance value is adjusted based on a control signal output by a control unit.

[0084] For example, the adjustable resistor may be SU160, SU190, etc. Among them, SU160 can be used to simulate a large resistor with a lower precision requirement, and SU190 can be used to simulate a small resistor with a higher precision requirement.

[0085] It should be noted that the adjustable resistor is only one implementation of the aforementioned signal interference device, and in a specific implementation, the signal interference device is not limited to being an adjustable resistor.

[0086] In one embodiment of the present application, step S420 includes: determining a target resistance of the transmission line based on the fault location, the target resistance being used to make the electrical signal received by the transmission controller correspond to the fault location; and configuring the resistance of the transmission line to be the target resistance.

[0087] In detail, the transmission line resistance corresponding to each position of the synchronizer can be obtained by pre-calculation, and a mapping relationship between each position of the synchronizer and the transmission line resistance can be established. In step S420, the target resistance of the transmission line can be obtained according to the fault position and the pre-established mapping relationship. The logic for determining the target resistance is simple.

[0088] In an embodiment in which an adjustable resistor is connected in series between a transmission controller and a position sensor and the resistance value of a transmission line is adjusted by adjusting the resistance value of the adjustable resistor, the resistance value of the transmission line is configured to be a target resistance value, that is, the resistance value of the adjustable resistor is adjusted to be the target resistance value.

[0089] When the synchronizer position fault is an abnormal gear position, or a failure to shift gears, or a failure to shift gears, when configuring the resistance of the transmission line according to the fault position, it is also necessary to control the state of the transmission to correspond to the synchronizer position fault that needs to be simulated.

[0090] Specifically, when the synchronizer position fault is a failure to disengage or engage, the state of the transmission is controlled to correspond to the synchronizer position fault to be simulated, that is, based on the predetermined disengagement gear position or engagement gear position, the transmission is controlled to perform the corresponding shifting operation. In this way, the fault simulation test is performed when the vehicle is in the corresponding driving state, ensuring the accuracy of the simulation test results.

[0091] When the synchronizer position fault is an abnormal gear position, the state of the transmission is controlled to correspond to the synchronizer position fault that needs to be simulated currently, that is, the transmission is controlled to be the gear that needs fault simulation currently. In this way, the fault simulation test is performed when the vehicle is in the corresponding driving state, ensuring the accuracy of the simulation test results.

[0092] Figure 5 A flowchart of a method for simulating synchronizer position fault of a transmission provided by another embodiment of the present application is schematically shown. Figure 5As shown, the method for simulating synchronizer position fault of a transmission provided in the embodiment of the present application includes steps S510 to S550, which are specifically as follows:

[0093] In step S510, an adjustable resistor is connected in series between the transmission controller and the position sensor to obtain a transmission line with adjustable resistance.

[0094] In step S520 , based on the synchronizer position fault to be simulated, a position other than the normal position of the synchronizer is selected as the fault position.

[0095] In step S530, based on the fault location, a target resistance value of the transmission line is determined, wherein the target resistance value is used to make the electrical signal received by the transmission controller correspond to the fault location.

[0096] In step S540, the state of the transmission is controlled to correspond to the synchronizer position fault to be simulated.

[0097] In step S550 , the resistance value of the adjustable resistor is adjusted based on the target resistance value.

[0098] It is understandable that the above steps S510 to S550 are not limited to Figure 5 The steps are performed in the order shown. For example, step S540 may be performed before step S530.

[0099] Figure 6 The relationship between the gear position and the synchronizer position provided in an embodiment of the present application is schematically shown. Figure 6 As shown, in one embodiment of the present application, the gears of the transmission include R gear, N gear, P gear, D1 gear to D7 gear, wherein the synchronizer position corresponding to the P / N gear is located between the D1 gear and the D5 gear, between the D4 gear and the D2 gear, between the D7 gear and the D3 gear, and between the R gear and the D6 gear. Near the 50% position (for example, 47% to 53%), it is the normal position corresponding to the synchronizer in the P / N gear; near the 18% position (for example, 15% to 23%), it is the normal position corresponding to the synchronizer in the D1 gear, the D4 gear, the D7 gear, and the R gear; near the 82% position (for example, 79% to 85%), it is the normal position corresponding to the synchronizer in the D5 gear, the D2 gear, the D3 gear, and the D6 gear.

[0100] Different fault injection environments are formulated for different position faults. Among them, the gear position abnormality is divided into gear position abnormality and neutral position abnormality. Among them, the gear position abnormality refers to the position abnormality of the synchronizer in R gear and D1 gear to D7 gear, and the neutral position abnormality refers to the position abnormality of the synchronizer in N gear. For the gear position abnormality fault, firstly control the transmission in the gear position that needs fault simulation at present, so that the vehicle can run steadily in the gear position that needs fault simulation at present, and then adjust the resistance value of the transmission line to realize the gear position abnormality fault injection. For the neutral position abnormality fault, it is also necessary to control the transmission in the neutral gear position first, so that the vehicle can run steadily in the neutral gear position, and then adjust the resistance value of the transmission line to realize the neutral position abnormality fault injection. For the gear failure and gear failure fault, it is necessary to adjust the resistance value of the transmission line and add or subtract the gear position at the same time when the vehicle is driving steadily to implement the fault injection. For the position overlimit fault, directly increase the resistance value of the transmission line to the maximum value, which is simple in logic and high in efficiency.

[0101] In detail, Figure 6 In the illustrated embodiment, the synchronizer position corresponding to the P / N gear is located in the middle position, while the synchronizer positions corresponding to the other gears are located on both sides. Therefore, for abnormal faults in the gear position, the synchronizer position needs to be moved to the middle position. Since the synchronizer position is on the low side in the D1 gear, D4 gear, D7 gear, and R gear, the corresponding transmission line resistance is relatively large at this time. Therefore, when injecting a fault, it is necessary to reduce the transmission line resistance so that the electrical signal received by the transmission controller corresponds to the synchronizer position biased toward the middle. For example, the reduced transmission line resistance can be between 3600Ω and 4200Ω. Since the synchronizer position is on the high side in the D5 gear, D2 gear, D3 gear, and D6 gear, the corresponding transmission line resistance is relatively small at this time. Therefore, when injecting a fault, it is necessary to increase the transmission line resistance so that the electrical signal received by the transmission controller corresponds to the synchronizer position biased toward the middle. For example, the increased transmission line resistance can be between 3600Ω and 4200Ω.

[0102] For example, the normal position corresponding to the synchronizer in D1 gear, D4 gear, D7 gear and R gear is at the 15%-23% position. In step S410, based on the synchronizer position fault to be simulated, a position other than the normal position of the synchronizer is selected as the fault position, that is, a position other than the 15%-23% position is selected as the fault position, such as the 24% position, the 27% position, the 31% position, etc.; in step S420, the resistance of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position, that is, the resistance of the transmission line is reduced so that the electrical signal received by the transmission controller corresponds to the 24% position, the 27% position, the 31% position, etc.

[0103] For another example, when the synchronizer is in D5, D2, D3 and D6 gears, the normal position corresponding to the synchronizer is at 79% to 85%. In step S410, based on the synchronizer position fault to be simulated, a position other than the normal position of the synchronizer is selected as the fault position, that is, a position other than the 79% to 85% position is selected as the fault position, such as the 77% position, the 75% position, the 72% position, etc.; in step S420, the resistance of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position, that is, the resistance of the transmission line is increased so that the electrical signal received by the transmission controller corresponds to the 77% position, the 75% position, the 72% position, etc.

[0104] For the abnormal neutral position fault, the position of the synchronizer needs to be moved to both sides. At this time, the corresponding transmission line resistance is an intermediate value. Therefore, when injecting the fault, you can choose to move the position of the synchronizer to the low side or to the high side. When the position of the synchronizer is moved to the high side, the transmission line resistance needs to be reduced so that the electrical signal received by the transmission controller corresponds to the position of the synchronizer biased to the high side. For example, the reduced transmission line resistance can be controlled at about 3500Ω; conversely, when the position of the synchronizer is moved to the low side, the transmission line resistance needs to be increased so that the electrical signal received by the transmission controller corresponds to the position of the synchronizer biased to the low side. For example, the increased transmission line resistance can be controlled at about 3500Ω.

[0105] For example, when the synchronizer is in neutral, the normal position corresponding to the synchronizer is at 47% to 53%. In step S410, based on the synchronizer position fault that needs to be simulated, a position other than the normal position of the synchronizer is selected as the fault position, that is, a position other than the 47% to 53% position is selected as the fault position, such as the 39% position, the 42% position, the 45% position, etc.; in step S420, the resistance of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position, that is, the resistance of the transmission line is increased so that the electrical signal received by the transmission controller corresponds to the 39% position, the 42% position, the 45% position, etc.

[0106] It should be noted that the low side refers to a side closer to the 0% position with the 50% position as a reference, and the high side refers to a side closer to the 100% position with the 50% position as a reference.

[0107] Furthermore, in some embodiments, for a position over-limit fault, the transmission line may be unplugged so that the transmission controller cannot recognize the position information output by the sensor and assumes that the synchronizer is at the 100% position at this time, thereby injecting a position over-limit fault.

[0108] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for simulating a synchronizer position fault of a transmission, characterized in that: The method comprises: Based on the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position; The electrical signal received by the transmission controller is configured according to the fault location.

2. The method according to claim 1, characterized in that The transmission is provided with a position sensor, which is used to detect the position information of the synchronizer and output it to the transmission controller in the form of an electrical signal through a transmission line; The step of configuring the electrical signal received by the transmission controller according to the fault location includes: The resistance value of the transmission line is configured according to the fault position so that the electrical signal received by the transmission controller corresponds to the fault position.

3. The method according to claim 2, characterized in that Before selecting a position other than a normal position of the synchronizer as a fault position based on the synchronizer position fault to be simulated, the method further includes: Connecting an adjustable resistor in series between the transmission controller and the position sensor to obtain the transmission line with adjustable resistance; Then, configuring the resistance of the transmission line according to the fault location includes: The resistance value of the adjustable resistor is adjusted according to the fault location to adjust the resistance value of the transmission line.

4. The method according to claim 2, characterized in that: The configuring the resistance of the transmission line according to the fault location includes: determining a target resistance value of the transmission line based on the fault location, the target resistance value being used to make the electrical signal received by the transmission controller correspond to the fault location; The resistance of the transmission line is configured to be the target resistance.

5. The method according to claim 2, characterized in that: The synchronizer position fault includes at least one of gear position abnormality, gear disengagement failure, gear engagement failure, and position overlimit, wherein the gear position abnormality is that the position of the synchronizer is outside the normal position corresponding to the current gear, and the position overlimit is that the position of the synchronizer exceeds the preset limit position, and the limit position is a position other than the position corresponding to the gear position abnormality; when the synchronizer position fault is any one of gear position abnormality, gear disengagement failure, and gear engagement failure, when the resistance value of the transmission line is configured according to the fault position, the state of the transmission is also controlled to correspond to the synchronizer position fault that needs to be simulated.

6. The method according to claim 5, characterized in that When the synchronizer position fault is an abnormal gear position, the synchronizer position fault to be simulated, selecting a position other than the normal position of the synchronizer as the fault position, includes: Determining a normal position corresponding to the synchronizer based on the gear position currently requiring fault simulation; According to the normal position corresponding to the synchronizer, selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer; The controlling the state of the transmission to correspond to the synchronizer position fault currently required to be simulated includes: The transmission is controlled to be the gear that currently requires fault simulation.

7. The method according to claim 5, characterized in that When the synchronizer position fault is a gear-shift failure or a gear-shift failure, the state of the transmission is controlled to correspond to the synchronizer position fault to be simulated, including: Based on the predetermined disengaging gear position or engaging gear position, the transmission is controlled to perform a corresponding gear shifting operation.

8. The method according to claim 7, characterized in that When the synchronizer position fault is a gear-engagement failure, the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position, includes: Determining a normal position corresponding to the synchronizer based on the gear position currently required to be engaged; According to the normal position corresponding to the synchronizer, selecting a position other than the normal position of the synchronizer as the fault position corresponding to the synchronizer; When the synchronizer position fault is a failure to disengage gears, the synchronizer position fault to be simulated, selecting a position other than a normal position of the synchronizer as a fault position, includes: Determining the gear position corresponding to the synchronizer based on the gear position currently requiring the gear to be disengaged; The gear position is used as the fault position of the synchronizer.

9. The method according to claim 2, characterized in that: When the synchronizer position fault is position over-limit, the position over-limit means that the position of the synchronizer exceeds a preset limit position, and the resistance value of the transmission line is configured according to the fault position, including: The resistance of the transmission line is configured to be a maximum value.

10. The method according to any one of claims 2 to 9, characterized in that: The transmission controller has a voltage output terminal and a current receiving terminal, the position sensor has a first input terminal and a first output terminal, the voltage output terminal outputs a preset voltage signal to the first input terminal, the internal resistance of the position sensor is determined based on its position, and the first output terminal is connected to the current receiving terminal through the transmission line to output position information to the transmission controller through the transmission line.

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