A power-on self-test method and device for an AMT gearbox

Abstract

The application provides a power-on self-test method for an AMT gearbox: when the shift knob position is less than a first set value, the knob is moved to the first gear direction; compared with the first initial position, the knob position of the first and second gears is moved to the first gear direction by more than a first set distance, which is the second initial position, and the knob is moved to the second gear direction; compared with the second initial position, the knob position of the first and second gears is moved to the second gear direction by more than a second set distance, and the knob position of the first and second gears is moved to the neutral gear, which is recorded as the third initial position, and the knob is moved to the third gear direction; compared with the third initial position, the knob position of the third and fourth gears is moved to the third gear direction by more than a third set distance, which is the fourth initial position, and the knob is moved to the third gear direction; compared with the fourth initial position, the knob position of the third and fourth gears is moved to the fourth gear direction by more than a fourth set distance, and the knob position of the third and fourth gears is moved to the neutral gear, which is recorded as the self-test success. The application can accurately determine the gear hanging failure.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission system technology, and more specifically, to a power-on self-test method and apparatus for an AMT transmission. Background Technology

[0002] With the development of new energy vehicles, pure electric AMT (Automated Mechanical Transmission) systems are increasingly being used in the commercial vehicle sector due to their advantages of accommodating both high and low vehicle speeds, steep gradients, and low operator workload.

[0003] After a period of operation, the shift actuator may experience wear, jamming, or other malfunctions. During disassembly, inspection, and repair, there may be instances where the shift mechanism is installed backwards or the wiring harness is installed backwards. Therefore, the AMT actuator needs a self-testing method to determine whether there is a malfunction.

[0004] In summary, the present invention provides a power-on self-test method and apparatus for AMT transmissions. Summary of the Invention

[0005] To address the problems of the prior art, this invention provides a power-on self-test method for an AMT transmission. The method is applicable to a four-speed AMT system, which includes two independent shifting devices. The first independent shifting device is responsible for gears 1 and 2, and the second independent shifting device is responsible for gears 3 and 4. The method includes the following steps:

[0006] Step a: When the shift lever positions of the two independent shifting devices do not exceed the first set value, the shift lever positions of 1st and 2nd gears and 3rd and 4th gears at this time are recorded as the first initial position. The shift actuator moves the shift lever towards 1st gear with the set first shifting force and first time. After reaching the first time, proceed to step b.

[0007] Step b: If, compared with the first initial position, the shift knob positions of gears 1 and 2 have moved more than a first set distance toward gear 1, then the shift knob positions of gears 1 and 2 and gears 3 and 4 at this moment are recorded as the second initial position. The shift actuator moves the shift knob toward gear 2 with a set second shift force and a second time. After reaching the second time, proceed to step c.

[0008] Step c: If, compared to the second initial position, the positions of the 1st and 2nd gear shifters have moved more than the second set distance toward the 2nd gear, then after moving the 1st and 2nd gear shifters to neutral, record the shifter positions of the 1st and 2nd gears and the 3rd and 4th gears at this moment as the third initial position. The shift actuator moves the shifter toward the 3rd gear with the set third shifting force and third time. After reaching the third time, proceed to step d.

[0009] Step d: If, compared with the third initial position, the positions of the 3rd and 4th gear shifters have moved more than the third set distance toward the 3rd gear, then record the shifter positions of the 1st and 2nd gears and the 3rd and 4th gears at this moment as the fourth initial position. The shift actuator moves the shifter toward the 3rd gear with the set fourth shifting force and fourth time. After reaching the fourth time, proceed to step e.

[0010] Step e: If, compared to the fourth initial position, the positions of the 3rd and 4th gear shifters have moved more than the fourth preset distance toward the 4th gear, then after moving the 3rd and 4th gear shifters to neutral, record that the self-test was successful.

[0011] According to one embodiment of the present invention, the method comprises:

[0012] Step 1: Check if the vehicle has been re-energized. If so, proceed to Step 2; otherwise, skip the self-check.

[0013] Step 2: Check if the four-speed AMT system is in neutral. If yes, proceed to step 4; otherwise, proceed to step 3.

[0014] Step 3: Shift the four-speed AMT system to neutral. After shifting to neutral, proceed to Step 4. If the system is not shifted to neutral within the specified time, report the fault "Failed to return to neutral after power-on" and end the self-test.

[0015] Step 4: Determine whether the shift knob positions of the two independent shifting devices exceed the first set value. If so, report the fault "sensor fault" and end the self-test. If not, proceed to step a.

[0016] According to one embodiment of the present invention, compared with the first initial position, if the positions of the 1st and 2nd gear shifters have moved more than the first predetermined distance in the 1st gear direction, then proceed to step b; otherwise, proceed to step five, wherein step five includes:

[0017] Compared to the first initial position, if the 1st and 2nd gear shift knob positions move more than the first set distance toward 2nd gear, a fault "1st and 2nd gear shift actuator wires reversed" will be reported.

[0018] Compared to the first initial position, if the 3rd or 4th gear shift knob position moves more than the first set distance toward 3rd or 4th gear, a fault "1st and 2nd gear shift actuators are installed backwards with 3rd or 4th gear" will be reported.

[0019] Compared to the first initial position, if the positions of the gear shift knobs for 1st and 2nd gears and 3rd and 4th gears do not exceed the first set distance, a fault "Cannot be pushed towards 1st gear" is reported, and the self-test ends.

[0020] According to one embodiment of the present invention, compared with the second initial position, if the positions of the 1st and 2nd gear shifters move more than the second predetermined distance towards the 2nd gear, then proceed to step c; otherwise, proceed to step six, wherein step six includes:

[0021] Compared to the second initial position, if the 1st and 2nd gear shift knob positions move more than the second set distance toward 1st gear, a fault "1st and 2nd gear shift actuator wires reversed" will be reported.

[0022] Compared to the second initial position, if the 3rd or 4th gear shift knob position moves more than the second set distance toward 3rd or 4th gear, a fault "1st and 2nd gear shift actuators are installed backwards with 3rd or 4th gear" will be reported.

[0023] Compared to the second initial position, if the positions of the 1st and 2nd gear shifters and the 3rd and 4th gear shifters do not exceed the second set distance, a fault "Cannot be pushed towards 2nd gear" is reported, and the self-test ends.

[0024] According to an embodiment of the present invention, step c includes:

[0025] Move the 1st and 2nd gear shifters to neutral. If the gear is not shifted to neutral within five hours, the system will report the fault "1st and 2nd gear self-test failed to return to neutral" and end the self-test.

[0026] According to one embodiment of the present invention, compared with the third initial position, if the positions of the 3rd and 4th gear shifters move more than the third predetermined distance in the 3rd gear direction, then proceed to step d; otherwise, proceed to step seven, wherein step seven includes:

[0027] Compared to the third initial position, if the 3rd and 4th gear shift knobs move more than the third set distance toward the 4th gear, a fault "3rd and 4th gear shift actuator wires reversed" will be reported.

[0028] Compared to the third initial position, if the position of the 1st or 2nd gear shift head moves more than the third set distance toward 1st or 2nd gear, a fault "1st or 2nd gear shift actuators are installed backwards" will be reported.

[0029] Compared to the third initial position, if the positions of the shift knobs for gears 1 and 2, and gears 3 and 4, do not exceed the third set distance, a fault "Cannot be pushed towards gear 3" is reported, and the self-test ends.

[0030] According to one embodiment of the present invention, compared with the fourth initial position, if the positions of the 3rd and 4th gear shifters move more than the fourth predetermined distance in the 4th gear direction, then proceed to step e; otherwise, proceed to step eight, wherein step eight includes:

[0031] Compared to the fourth initial position, if the 3rd and 4th gear shift knob positions move more than the fourth set distance towards 3rd gear, a fault "3rd and 4th gear shift actuator wires reversed" will be reported.

[0032] Compared with the fourth initial position, if the position of the 1st or 2nd gear shift head moves more than the fourth set distance toward 1st or 2nd gear, a fault "1st or 2nd gear shift actuators are installed backwards" will be reported.

[0033] Compared to the fourth initial position, if the positions of the shift knobs for gears 1 and 2, and gears 3 and 4, do not exceed the fourth preset distance, a fault "Cannot be pushed towards gear 4" is reported, and the self-test ends.

[0034] According to an embodiment of the present invention, step e includes:

[0035] Move the 3rd and 4th gear shift knobs to neutral. If the gear is not shifted to neutral within the sixth time interval, the system will report the fault "3rd and 4th gear self-test failed to return to neutral" and end the self-test.

[0036] According to another aspect of the invention, a storage medium is also provided, which includes a series of instructions for performing the steps of the method described in any of the preceding claims.

[0037] According to another aspect of the present invention, a power-on self-test device for an AMT transmission is also provided, wherein a power-on self-test is performed by a power-on self-test method for an AMT transmission as described in any of the preceding claims. The method is applicable to a four-speed AMT system, the four-speed AMT system comprising two independent shifting devices, a first independent shifting device responsible for gears 1 and 2, and a second independent shifting device responsible for gears 3 and 4. The device comprises:

[0038] The first module is used to record the shift positions of gears 1 and 2 and gears 3 and 4 as the first initial position when the shift positions of the shift levers of the two independent shift devices do not exceed the first set value. The shift actuator moves the shift lever towards gear 1 with a set first shift force and a first time. After the first time is reached, it switches to the second module.

[0039] The second module is used to record the positions of the shift knobs for gears 1 and 2 and gears 3 and 4 as the second initial position if, compared with the first initial position, the shift knobs for gears 1 and 2 have moved more than a first set distance toward gear 1. The shift actuator then moves the shift knobs toward gear 2 with a set second shift force and a second time. After the second time is reached, the shift will switch to the third module.

[0040] The third module is used to move the shift knobs of gears 1 and 2 to neutral if, compared with the second initial position, the shift knobs of gears 1 and 2 have moved more than a second set distance toward gear 2. Then, the shift knobs of gears 1 and 2 and gears 3 and 4 are moved to neutral and the shift knobs of gears 1 and 2 and gears 3 and 4 are recorded as the third initial position. The shift actuator moves the shift knobs toward gear 3 with a set third shift force and a third time. After the third time is reached, the shift switch is transferred to the fourth module.

[0041] The fourth module is used to record the positions of the shift knobs for gears 1 and 2 and gears 3 and 4 as the fourth initial position if, compared with the third initial position, the shift knob positions for gears 3 and 4 have moved more than a third set distance towards gear 3. The shift actuator then moves the shift knob towards gear 3 with a set fourth shift force and a fourth time. After reaching the fourth time, the process switches to the fifth module.

[0042] The fifth module is used to move the 3rd and 4th gear shifters to neutral and record a successful self-test if the 3rd and 4th gear shifters have moved more than a fourth set distance in the 4th gear direction compared to the fourth initial position.

[0043] The power-on self-test method and device for AMT transmissions provided by this invention have the following advantages compared with the prior art:

[0044] 1. A power-on self-test method for an AMT transmission is provided, wherein the position of the shift lever is fed back to the transmission control unit in real time through a position detection device (sensor). The transmission control unit can control both the shift power source and the system power unit. After a series of prescribed operations, the position of the shift lever is detected to determine whether the self-test has passed.

[0045] 2. A power-on self-test method for AMT transmission is provided, which requires little time and can accurately determine the faults of the position detection device (sensor) and the faults of the actuator in shifting gears to various positions.

[0046] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0047] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0048] Figure 1 An AMT system according to an embodiment of the present invention is shown;

[0049] Figure 2A flowchart of a power-on self-test method for an AMT transmission according to an embodiment of the present invention is shown;

[0050] Figure 3 A flowchart of a power-on self-test method for an AMT transmission according to another embodiment of the present invention is shown; and

[0051] Figure 4 A block diagram of a power-on self-test device for an AMT transmission according to an embodiment of the present invention is shown. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0053] Figure 1 An AMT system according to an embodiment of the present invention is shown.

[0054] like Figure 1 As shown, the shift power source and the shift lever constitute the shift actuator. The shift power source drives the shift lever to move left and right through power output (the magnitude and direction of this power output are adjustable), thereby realizing the shift action.

[0055] The position detection device (sensor) can detect the actual position of the shift lever in real time and transmit it to the transmission control unit; the transmission control unit is responsible for sending commands and data storage and calculation for the entire system; the shift lever is an internal part of the transmission, and by adjusting its position, the switching of different working gear pairs in the transmission can be realized; the system drive unit is the power source of the entire AMT system, which can be a power device such as an engine or an electric motor.

[0056] exist Figure 1 In this system, the position of the gear shift lever is fed back to the transmission control unit in real time via a position detection device (sensor). The transmission control unit can control both the shifting power source and the system power unit. The transmission control unit can also monitor the speed signal of the transmission output shaft in real time.

[0057] Figure 2 A flowchart of a power-on self-test method for an AMT transmission according to an embodiment of the present invention is shown.

[0058] Figure 2 The method shown is applicable to a four-speed AMT system, which includes two independent shifting devices. The first independent shifting device is responsible for gears 1 and 2, and the second independent shifting device is responsible for gears 3 and 4.

[0059] like Figure 2As shown, in step S201, i.e. step a, when the shift lever positions of the two independent shifting devices do not exceed the first set value, the shift lever positions of gears 1 and 2 and gears 3 and 4 at this time are recorded as the first initial positions. The shifting actuator moves the shift lever towards gear 1 with the set first shifting force and first time. After reaching the first time, it proceeds to step b.

[0060] like Figure 2 As shown, in step S202, i.e. step b, if the shift knob positions of gears 1 and 2 have moved more than a first set distance toward gear 1 compared to the first initial position, then the shift knob positions of gears 1 and 2 and gears 3 and 4 at this moment are recorded as the second initial position. The shift actuator moves the shift knob toward gear 2 with a set second shift force and a second time. After reaching the second time, the process proceeds to step c.

[0061] like Figure 2 As shown, in step S203, i.e. step c, if the position of the 1st and 2nd gear shifters moves more than the second set distance towards the 2nd gear compared to the second initial position, then the 1st and 2nd gear shifters are moved to neutral, and the shifter positions of the 1st and 2nd gears and the 3rd and 4th gears at this moment are recorded as the third initial position. The shift actuator moves the shifter towards the 3rd gear with the set third shifting force and third time. After reaching the third time, the process proceeds to step d.

[0062] like Figure 2 As shown, in step S204, i.e. step d, if the shift knob positions of gears 3 and 4 move more than the third set distance towards gear 3 compared to the third initial position, then the shift knob positions of gears 1 and 2 and gears 3 and 4 at this moment are recorded as the fourth initial position. The shift actuator moves the shift knob towards gear 3 with the set fourth shift force and fourth time. After reaching the fourth time, it proceeds to step e.

[0063] like Figure 2 As shown, in step S205, i.e. step e, if the position of the 3rd and 4th gear shifters moves more than the fourth set distance in the 4th gear direction compared with the fourth initial position, then after moving the 3rd and 4th gear shifters to neutral, the self-test is recorded as successful.

[0064] Figure 3 A flowchart of a power-on self-test method for an AMT transmission according to another embodiment of the present invention is shown.

[0065] STEP1: Check if the vehicle has been newly powered on. If so, proceed to STEP2; otherwise, do not perform a self-check.

[0066] STEP2: Check if the four-speed AMT system is in neutral. If yes, proceed to STEP4; otherwise, proceed to STEP3.

[0067] STEP3: Shift the four-speed AMT system to neutral. After shifting to neutral, proceed to STEP4. If the system is not shifted to neutral within the seventh time, the system will report the fault "Failed to return to neutral after power-on" and end the self-test.

[0068] STEP4: Determine the position of the shift paddles of the two independent shifting devices. If the position exceeds the first set value, report the fault "sensor fault" and end the self-test. If the position does not exceed the first set value, proceed to STEP5.

[0069] STEP 5: Record the initial positions of the shift knobs for 1st, 2nd, 3rd, and 4th gears at this moment, hereinafter referred to as the "first initial position". The shift actuator moves the shift knob towards 1st gear with the set first shift force and the first time. After reaching the set first time, proceed to STEP 6.

[0070] STEP6: Compared with the first initial position, if the 1st and 2nd gear shift positions move more than the first set distance towards 1st gear, then proceed to STEP8; otherwise, proceed to STEP7.

[0071] STEP 7: Compared to the first initial position, if the 1st or 2nd gear shift knob moves more than a first set distance towards 2nd gear, report the fault "1st or 2nd gear shift actuator wires reversed"; if the 3rd or 4th gear shift knob moves more than a first set distance towards 3rd or 4th gear, report the fault "1st or 2nd gear and 3rd or 4th gear shift actuators reversed"; if the 1st or 2nd gear and 3rd or 4th gear shift knobs do not exceed the first set distance compared to the first initial position, report the fault "Cannot be pushed towards 1st gear"; and end the self-test.

[0072] STEP 8: Record the initial positions of the shift knobs for 1st, 2nd, 3rd, and 4th gears at this moment, hereinafter collectively referred to as the "second initial position". The shift actuator moves the shift knob towards 2nd gear with the set second shift force and second time. After reaching the set second time, proceed to STEP 9.

[0073] STEP 9: Compared with the second initial position, if the 1st and 2nd gear shift positions move more than the second set distance towards 2nd gear, then proceed to STEP 11; otherwise, proceed to STEP 10.

[0074] STEP 10: Compared to the second initial position, if the 1st or 2nd gear shift knob moves more than the second preset distance towards 1st gear, report the fault "1st or 2nd gear shift actuator wires reversed"; if the 3rd or 4th gear shift knob moves more than the second preset distance towards 3rd or 4th gear, report the fault "1st or 2nd gear and 3rd or 4th gear shift actuators reversed"; if the 1st or 2nd gear and 3rd or 4th gear shift knobs do not exceed the second preset distance compared to the second initial position, report the fault "Cannot be pushed towards 2nd gear" and end the self-test.

[0075] STEP 11: Move the 1st and 2nd gear shift knobs to neutral. After shifting to neutral, proceed to STEP 12. If the gear is not shifted to neutral within the fifth time, the fault "1st and 2nd gear self-test failed to return to neutral" will be reported, and the self-test will end.

[0076] STEP12: Record the initial positions of the shift knobs for 1st, 2nd, 3rd, and 4th gears at this moment, hereinafter referred to as the "third initial position". The shift actuator moves the shift knob towards 3rd gear with the set third shift force and third time. After reaching the set third time, proceed to STEP13.

[0077] STEP13: Compared to the third initial position, if the 3rd and 4th gear shift knobs have moved more than the third set distance toward 3rd gear, then proceed to STEP15; otherwise, proceed to STEP14.

[0078] STEP 14: Compared to the third initial position, if the 3rd and 4th gear shift knobs move more than the third preset distance towards 4th gear, report the fault "3rd and 4th gear shift actuator wires reversed"; compared to the third initial position, if the 1st and 2nd gear shift knobs move more than the third preset distance towards 1st or 2nd gear, report the fault "1st and 2nd gear shift actuators and 3rd and 4th gear shift actuators reversed"; compared to the third initial position, if neither the 1st nor 2nd gear shift knobs nor the 3rd and 4th gear shift knobs exceed the third preset distance, report the fault "Cannot be pushed towards 3rd gear" and end the self-test.

[0079] STEP15: Record the initial positions of the shift knobs for 1st, 2nd, 3rd, and 4th gears at this moment, hereinafter referred to as the "fourth initial position". The shift actuator moves the shift knob towards 3rd gear with the set fourth shift force and fourth time. After reaching the set fourth time, proceed to STEP16.

[0080] STEP16: Compared to the fourth initial position, if the 3rd and 4th gear shift knobs have moved more than the fourth set distance toward the 4th gear, then proceed to STEP18; otherwise, proceed to STEP17.

[0081] STEP 17: Compared to the fourth initial position, if the 3rd and 4th gear shift knobs move more than the fourth preset distance towards 3rd gear, report the fault "3rd and 4th gear shift actuator wires reversed"; compared to the fourth initial position, if the 1st and 2nd gear shift knobs move more than the fourth preset distance towards 1st or 2nd gear, report the fault "1st and 2nd gear shift actuators and 3rd and 4th gear shift actuators reversed"; compared to the fourth initial position, if neither the 1st nor 2nd gear shift knobs nor the 3rd and 4th gear shift knobs exceed the fourth preset distance, report the fault "Cannot be pushed towards 4th gear" and end the self-test.

[0082] STEP18: Move the 3rd and 4th gear shift knobs to neutral. After shifting to neutral, proceed to STEP19. If the gear is not shifted to neutral within the six-hour time limit, the fault "3rd and 4th gear self-test failed to return to neutral" will be reported, and the self-test will end.

[0083] STEP19. Self-test successful. The self-test flag is incremented by 1.

[0084] It should be noted that the first set value, the first initial position, the first shift force, the first time, the first set distance, the second initial position, the second shift force, the second time, the second set distance, the third initial position, the third shift force, the third time, the third set distance, the fourth initial position, the fourth shift force, the fourth time, the fourth set distance, the fifth time, the sixth time, and the seventh time can be set and changed according to actual needs, and the present invention does not impose any restrictions on this.

[0085] In one embodiment, the values ​​of the first set distance, the second set distance, the third set distance, and the fourth set distance are equal.

[0086] In one embodiment, the values ​​of the first time, second time, third time, fourth time, fifth time, sixth time, and seventh time are equal.

[0087] The power-on self-test method and apparatus for AMT transmissions provided by this invention can also be used in conjunction with a computer-readable storage medium. The storage medium stores a computer program, and executing the computer program runs the power-on self-test method for AMT transmissions. The computer program is capable of executing computer instructions, which include computer program code. The computer program code can be in the form of source code, object code, executable file, or some intermediate form.

[0088] Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0089] It should be noted that the contents of computer-readable storage media may be appropriately added to or subtracted from the contents according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media may not include electrical carrier signals and telecommunication signals.

[0090] Figure 4 A block diagram of a power-on self-test device for an AMT transmission according to an embodiment of the present invention is shown.

[0091] like Figure 4 As shown, the power-on self-test device 400 for AMT transmission includes a first module 401, a second module 402, a third module 403, a fourth module 404, and a fifth module 405.

[0092] The 400 power-on self-test device for AMT transmissions is applicable to four-speed AMT systems. The four-speed AMT system includes two independent shifting devices. The first independent shifting device is responsible for gears 1 and 2, and the second independent shifting device is responsible for gears 3 and 4.

[0093] The first module 401 is used to record the shift positions of gears 1 and 2 and gears 3 and 4 as the first initial position when the shift positions of the shift levers of the two independent shift devices do not exceed the first set value. The shift actuator moves the shift lever towards gear 1 with the set first shift force and first time. After reaching the first time, it switches to the second module.

[0094] The second module 402 is used to record the positions of the shift knobs for gears 1 and 2 and gears 3 and 4 as the second initial position if, compared with the first initial position, the shift knobs for gears 1 and 2 have moved more than a first set distance toward gear 1. The shift actuator then moves the shift knobs toward gear 2 with a set second shift force and a second time. After the second time is reached, the shift will switch to the third module.

[0095] The third module 403 is used to move the shift knobs of the 1st and 2nd gears to neutral if, compared with the second initial position, the shift knobs of the 1st and 2nd gears have moved to the 2nd gear direction by more than the second set distance. Then, the shift knobs of the 1st and 2nd gears and the shift knobs of the 3rd and 4th gears are recorded as the third initial position. The shift actuator moves the shift knobs to the 3rd gear direction with the set third shift force and third time. After the third time is reached, it switches to the fourth module.

[0096] The fourth module 404 is used to record the positions of the shift knobs for 1st and 2nd gears and 3rd and 4th gears as the fourth initial position if, compared with the third initial position, the shift knobs for 3rd and 4th gears have moved more than the third set distance in the direction of 3rd gear. The shift actuator then moves the shift knobs in the direction of 3rd gear with the set fourth shift force and fourth time. After reaching the fourth time, it switches to the fifth module.

[0097] The fifth module 405 is used to move the 3rd and 4th gear shifters to neutral and record a successful self-test if the 3rd and 4th gear shifters have moved more than the fourth set distance in the 4th gear direction compared to the fourth initial position.

[0098] In summary, the power-on self-test method and device for AMT transmissions provided by this invention have the following advantages compared with the prior art:

[0099] 1. A power-on self-test method and device for an AMT transmission is provided. The position of the shift lever is fed back to the transmission control unit in real time through a position detection device. The transmission control unit can control both the shift power source and the system power unit. After a series of prescribed operations, the position of the shift lever is detected to determine whether the self-test has passed.

[0100] 2. A power-on self-test method and device for AMT transmission is provided, which requires a short time and can accurately determine the faults of the position detection device (sensor) and the faults of the actuator in shifting gears to various positions.

[0101] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0102] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0103] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0104] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0105] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0106] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A power-on self-test method for an AMT transmission, characterized in that, The method is applicable to a four-speed AMT system, which includes two independent shifting devices. The first independent shifting device is responsible for gears 1 and 2, and the second independent shifting device is responsible for gears 3 and 4. The method includes the following steps: Step a: When the shift lever positions of the two independent shifting devices do not exceed the first set value, the shift lever positions of 1st and 2nd gears and 3rd and 4th gears at this time are recorded as the first initial position. The shift actuator moves the shift lever towards 1st gear with the set first shifting force and first time. After reaching the first time, proceed to step b. Step b: If, compared with the first initial position, the shift knob positions of gears 1 and 2 have moved more than a first set distance toward gear 1, then the shift knob positions of gears 1 and 2 and gears 3 and 4 at this moment are recorded as the second initial position. The shift actuator moves the shift knob toward gear 2 with a set second shift force and a second time. After reaching the second time, proceed to step c. Step c: If, compared to the second initial position, the position of the 1st and 2nd gear shifters has moved more than the second set distance toward the 2nd gear, then after moving the 1st and 2nd gear shifters to neutral, record the shifter positions of the 1st and 2nd gears and the 3rd and 4th gears at this moment as the third initial position. The shift actuator moves the shifter toward the 3rd gear with the set third shifting force and third time. After reaching the third time, proceed to step d. Step d: If, compared with the third initial position, the shift knob positions of gears 3 and 4 have moved more than the third set distance toward gear 3, then the shift knob positions of gears 1 and 2 and gears 3 and 4 at this moment are recorded as the fourth initial position. The shift actuator moves the shift knob toward gear 3 with the set fourth shift force and fourth time. After reaching the fourth time, proceed to step e. Step e: If, compared with the fourth initial position, the positions of the 3rd and 4th gear shifters have moved more than the fourth preset distance toward the 4th gear, then after moving the 3rd and 4th gear shifters to neutral, record that the self-test was successful. The values ​​of the first time, the second time, the third time, and the fourth time are all equal.

2. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, The method includes: Step 1: Check if the vehicle's ignition is turned back on. If yes, proceed to Step 2; otherwise, skip the self-check. Step 2: Check if the four-speed AMT system is in neutral. If yes, proceed to step 4; otherwise, proceed to step 3. Step 3: Shift the four-speed AMT system to neutral. After shifting to neutral, proceed to Step 4. If the system is not shifted to neutral within the specified time, report the fault "Failed to return to neutral after power-on" and end the self-test. Step 4: Determine whether the shift knob positions of the two independent shifting devices exceed the first set value. If so, report the fault "sensor fault" and end the self-test. If not, proceed to step a.

3. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Compared to the first initial position, if the positions of gear 1 and 2 have moved more than the first set distance towards gear 1, then proceed to step b; otherwise, proceed to step five, which includes: Compared to the first initial position, if the 1st and 2nd gear shift knob positions move more than the first set distance toward 2nd gear, a fault "1st and 2nd gear shift actuator wires reversed" is reported; Compared to the first initial position, if the 3rd or 4th gear shift knob position moves more than the first set distance toward 3rd or 4th gear, a fault "1st and 2nd gear shift actuators are installed backwards with 3rd or 4th gear" is reported. Compared to the first initial position, if the positions of the gear shift knobs for 1st and 2nd gears and 3rd and 4th gears do not exceed the first set distance, a fault "Cannot be pushed towards 1st gear" is reported, and the self-test ends.

4. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Compared to the second initial position, if the positions of the 1st and 2nd gear shifters move more than the second set distance towards the 2nd gear, then proceed to step c; otherwise, proceed to step six, which includes: Compared to the second initial position, if the 1st and 2nd gear shift knob positions move more than the second set distance toward 1st gear, a fault "1st and 2nd gear shift actuator wires reversed" will be reported. Compared to the second initial position, if the 3rd or 4th gear shift knob position moves more than the second set distance toward 3rd or 4th gear, a fault "1st and 2nd gear shift actuators are installed backwards with 3rd or 4th gear" will be reported. Compared to the second initial position, if the positions of the gear shift knobs for 1st and 2nd gears and 3rd and 4th gears do not exceed the second set distance, a fault "Cannot be pushed towards 2nd gear" is reported, and the self-test ends.

5. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Step c includes: Move the 1st and 2nd gear shifters to neutral. If the gear is not shifted to neutral within the fifth time, the system will report the fault "1st and 2nd gear self-test failed to return to neutral" and end the self-test.

6. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Compared to the third initial position, if the 3rd and 4th gear shifters move more than the third preset distance towards 3rd gear, then proceed to step d; otherwise, proceed to step seven, which includes: Compared to the third initial position, if the 3rd and 4th gear shift knobs move more than the third set distance toward 4th gear, a fault "3rd and 4th gear shift actuator wires reversed" is reported. Compared to the third initial position, if the position of the 1st or 2nd gear shift head moves more than the third set distance toward 1st or 2nd gear, a fault "1st or 2nd gear shift actuators are installed backwards" is reported. Compared to the third initial position, if the positions of the shift knobs for gears 1 and 2, and gears 3 and 4, do not exceed the third set distance, a fault "Cannot be pushed towards gear 3" is reported, and the self-test ends.

7. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Compared to the fourth initial position, if the 3rd and 4th gear shift positions move more than the fourth predetermined distance towards the 4th gear, then proceed to step e; otherwise, proceed to step eight, which includes: Compared to the fourth initial position, if the 3rd and 4th gear shift knob positions move more than the fourth set distance toward 3rd gear, a fault "3rd and 4th gear shift actuator wires reversed" is reported. Compared to the fourth initial position, if the position of the 1st or 2nd gear shift head moves more than the fourth set distance toward 1st or 2nd gear, a fault "1st or 2nd gear shift actuators are installed backwards" is reported. Compared to the fourth initial position, if the positions of the shift knobs for gears 1 and 2, and gears 3 and 4, do not exceed the fourth preset distance, a fault "Cannot be pushed towards gear 4" is reported, and the self-test ends.

8. The power-on self-test method for an AMT transmission as described in claim 1, characterized in that, Step e includes: Move the 3rd and 4th gear shift knobs to neutral. If the gear is not shifted to neutral within the sixth time interval, the system will report the fault "3rd and 4th gear self-test failed to return to neutral" and end the self-test.

9. A storage medium, characterized in that, It includes a series of instructions for performing the method steps as described in any one of claims 1-8.

10. A power-on self-test device for an AMT transmission, characterized in that, A power-on self-test is performed using a power-on self-test method for an AMT transmission as described in any one of claims 1-8. The method is applicable to a four-speed AMT system, which includes two independent shifting devices. The first independent shifting device is responsible for gears 1 and 2, and the second independent shifting device is responsible for gears 3 and 4. The device comprises: The first module is used to record the shift positions of gears 1 and 2 and gears 3 and 4 as the first initial position when the shift positions of the shift levers of the two independent shift devices do not exceed the first set value. The shift actuator moves the shift lever towards gear 1 with a set first shift force and a first time. After the first time is reached, it switches to the second module. The second module is used to record the positions of the shift knobs for gears 1 and 2 and gears 3 and 4 as the second initial position if, compared with the first initial position, the shift knobs for gears 1 and 2 have moved more than a first set distance toward gear 1. The shift actuator then moves the shift knobs toward gear 2 with a set second shift force and a second time. After the second time is reached, the shift will switch to the third module. The third module is used to move the shift knobs of gears 1 and 2 to neutral if, compared with the second initial position, the shift knobs of gears 1 and 2 have moved more than a second set distance toward gear 2. Then, the shift knobs of gears 1 and 2 and gears 3 and 4 are moved to neutral and the shift knobs of gears 1 and 2 and gears 3 and 4 are recorded as the third initial position. The shift actuator moves the shift knobs toward gear 3 with a set third shift force and a third time. After the third time is reached, the shift switch is transferred to the fourth module. The fourth module is used to record the positions of the shift knobs for gears 1 and 2 and gears 3 and 4 as the fourth initial position if, compared with the third initial position, the shift knob positions for gears 3 and 4 have moved more than a third set distance towards gear 3. The shift actuator then moves the shift knob towards gear 3 with a set fourth shift force and a fourth time. After reaching the fourth time, the process switches to the fifth module. The fifth module is used to move the 3rd and 4th gear shifters to neutral and record a successful self-test if the 3rd and 4th gear shifters have moved more than a fourth set distance in the 4th gear direction compared to the fourth initial position.

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