Method for protecting the towing function of an amt transmission

Abstract

The present application relates to AMT gearbox trailer function protection method, containing steps: judge trailer function precondition; judge fault information; execute trailer mode; execute trailer function activation process; check whether the trailer gear is successfully engaged; real-time monitor gearbox gear; end the flow of this trailer function protection method. The present application avoids the dilemma of forcibly towing the trailer, does not cause the gearbox to be unable to be fully lubricated, and does not cause the gear to be ablated and the gearbox to be damaged; when a safety fault occurs in the vehicle, the gearbox towing function can be activated manually to tow the trailer, meeting the demand of towing the trailer without disassembling the transmission shaft and damaging the gearbox.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of AMT gearbox control, in particular to an AMT gearbox trailer function protection method. BACKGROUND

[0002] At present, AMT gearboxes have been widely used in the automotive industry. It can be predicted that the share of AMT gearboxes in the future automotive industry (especially in the commercial vehicle industry) will continue to increase.

[0003] Under some extreme conditions, the vehicle cannot move on its own due to accidents or some failures of key system components such as AMT gearboxes, and the transmission shaft needs to be disassembled by contacting the towing service company before the vehicle can be towed to the maintenance service site. That is, the existing technology for AMT gearbox towing processing method mostly only disassembles the transmission shaft to perform towing work.

[0004] After searching, there is no protection technology for AMT gearbox in the existing technology. The closest existing technology is a Chinese invention patent with the application number CN202111013810.7 and the name "A low-speed control method, device and equipment for a commercial vehicle matching an AMT", which discloses a low-speed control method for AMT. However, its purpose is to achieve smooth control of AMT during low-speed operation, not to protect AMT during towing. Therefore, the technical means, technical purpose and technical effect are different.

[0005] The defects of the existing technology are:

[0006] 1. Since the existing technology does not develop a response method for towing conditions in the gearbox strategy on the existing AMT gearbox, according to the mechanical structure principle of the AMT gearbox, the gearbox is disconnected when the gearbox is in neutral, so that if the vehicle is towed forcibly, the gearbox cannot be fully lubricated, which may cause gear erosion and damage to the gearbox.

[0007] 2. Since the existing technology cannot be driven when the vehicle fails, in order not to damage the gearbox and other mechanical structures, the only way to tow is to disassemble the transmission shaft, which greatly affects the efficiency and has a certain probability of causing secondary damage to the vehicle during disassembly of the transmission shaft. SUMMARY

[0008] The present application provides an AMT gearbox towing function protection method to solve the above problems, which aims to avoid the dilemma of forcibly towing the vehicle, without causing the gearbox to be insufficiently lubricated, and without causing gear erosion and damage to the gearbox. When a vehicle fails, the gearbox towing function can be activated manually to tow the vehicle, meeting the demand for towing the vehicle without disassembling the transmission shaft and damaging the gearbox.

[0009] To solve the above problems, the technical scheme provided by the present application is:

[0010] An AMT gearbox trailer function protection method, comprising the following steps:

[0011] S100. Determine whether the state of the current vehicle meets the manually preset trailer function precondition; then according to the determination result, the following operations are performed:

[0012] If the determination result is that the state of the current vehicle does not meet the trailer function precondition, return and execute S100 again;

[0013] If the determination result is that the state of the current vehicle meets the trailer function precondition, execute S200;

[0014] S200. Determine whether the gearbox solenoid valve has reported a fault information, and then according to the determination result, the following operations are performed:

[0015] If the determination result is that the gearbox solenoid valve has reported the fault information, return and execute S100 again;

[0016] If the determination result is that the gearbox solenoid valve has not reported the fault information, execute S300;

[0017] S300. Inform the driver to manually execute the trailer mode; then check whether the trailer mode is executed; then according to the check result, the following operations are performed:

[0018] If the check result is that the trailer mode is not executed, return and execute S300 again;

[0019] If the check result is that the trailer mode has been executed, execute S400;

[0020] S400. Execute the trailer function activation process; then check whether the trailer function activation process is executed successfully; then according to the check result, the following operations are performed:

[0021] If the check result is that the trailer function activation process is not executed successfully, return and execute S400 again;

[0022] If the check result is that the trailer function activation process is executed successfully, execute S500;

[0023] S500. Check whether the trailer gear is engaged successfully; then according to the check result, the following operations are performed:

[0024] If the check result is that the trailer gear engagement is unsuccessful, the trailer mode is closed; meanwhile, a "trailer mode closed" alarm is issued; then S800 is executed;

[0025] If the check result is that the trailer gear engagement is successful, a prompt "trailer function activated" is issued; then S600 is executed;

[0026] S600. During the trailer process, the gearbox gear position is monitored in real time; then the following operations are performed according to the monitoring result:

[0027] If the monitoring result is that the gearbox does not occur out of gear, S700 is executed;

[0028] If the monitoring result is that the gearbox occurs out of gear, an out-of-gear alarm is issued, and then S800 is executed;

[0029] S700. Check whether the trailer has been completed; then the following operations are performed according to the check result:

[0030] If the check result is that the trailer has been completed, S800 is executed;

[0031] If the check result is that the trailer has not been completed, return and execute S600 again;

[0032] S800. End the flow of the trailer function protection method.

[0033] Preferably, the judgment in S100 whether the state of the current vehicle meets the trailer function precondition specifically comprises the following steps:

[0034] S110. Obtain the vehicle air pressure value and the vehicle voltage value;

[0035] S120. Compare the vehicle voltage value with the artificially preset vehicle voltage minimum threshold value; then the following operations are performed according to the comparison result:

[0036] If the vehicle voltage value is less than the vehicle voltage minimum threshold value, the judgment result is that the state of the current vehicle does not meet the trailer function precondition, and then return and execute S110 again;

[0037] If the vehicle voltage value is not less than the vehicle voltage minimum threshold value, S130 is executed;

[0038] S130. Compare the vehicle air pressure value with the artificially preset vehicle air pressure minimum threshold value; then the following operations are performed according to the comparison result:

[0039] If the vehicle air pressure value is less than the vehicle air pressure minimum threshold value, S140 is executed;

[0040] If the vehicle air pressure value is not less than the vehicle air pressure minimum threshold, then the result of the judgment is that the current state of the vehicle satisfies the precondition of the trailer function;

[0041] S140. Start the engine for the inflation operation; then start timing until the system air pressure low alarm is cleared; then turn off the power and execute S130 again.

[0042] Preferably, the trailer mode specifically comprises the following steps:

[0043] S310. The driver determines that the vehicle is currently in a stationary state;

[0044] S320. The driver turns the lock key to the ON position to enable the power;

[0045] S330. The driver puts the transmission handle into the neutral position.

[0046] Preferably, the trailer function activation process in S400 specifically comprises the following steps:

[0047] S410. Check the main box position; then according to the check result, the following operations are performed:

[0048] If the check result is that the main box position is not currently in the neutral position, then the check result is that the trailer function activation process is not successfully executed; then return and execute S410 again;

[0049] If the check result is that the main box position is currently in the neutral position, then execute S420;

[0050] S420. Switch the rear auxiliary box to the high gear; then check the rear auxiliary box position; then according to the check result, the following operations are performed:

[0051] If the check result is that the rear auxiliary box position is not currently in the high gear, then the check result is that the trailer function activation process is not successfully executed; then return and execute S420 again;

[0052] If the check result is that the rear auxiliary box position is currently in the high gear, then execute S430;

[0053] S430. Switch the front auxiliary box to the neutral position; then check the front auxiliary box position; then according to the check result, the following operations are performed:

[0054] If the check result is that the front auxiliary box position is not currently in the neutral position, then the check result is that the trailer function activation process is not successfully executed; then return and execute S430 again;

[0055] If the check result is that the front auxiliary box position is currently in the neutral position, then execute S440;

[0056] S440. Shift the main gearbox into 3rd gear; then check whether the main gearbox is successfully shifted into 3rd gear; then make the following operation according to the checking result:

[0057] If the checking result is that the main gearbox fails to be successfully shifted into 3rd gear, execute S450;

[0058] If the checking result is that the main gearbox is successfully shifted into 3rd gear, set the checking result as that the trailer function activation procedure is successfully executed; then execute S500;

[0059] S450. Shift the main gearbox into 2nd gear; then check whether the main gearbox is successfully shifted into 2nd gear; then make the following operation according to the checking result:

[0060] If the checking result is that the main gearbox fails to be successfully shifted into 2nd gear, execute S460;

[0061] If the checking result is that the main gearbox is successfully shifted into 2nd gear, set the checking result as that the trailer function activation procedure is successfully executed; then execute S500;

[0062] S460. Shift the main gearbox into 1st gear; then check whether the main gearbox is successfully shifted into 1st gear; then make the following operation according to the checking result:

[0063] If the checking result is that the main gearbox fails to be successfully shifted into 1st gear, execute S470;

[0064] If the checking result is that the main gearbox is successfully shifted into 1st gear, set the checking result as that the trailer function activation procedure is successfully executed; then execute S500;

[0065] S470. Set the checking result as that the trailer function activation procedure fails to be successfully executed; then return and execute S400 again.

[0066] Preferably, S410 further comprises the following steps:

[0067] S411. Perform a gear shifting action on the main gearbox; then compare the gear shifting action time with a manually preset first time threshold; then make the following operation according to the comparison result:

[0068] If the gear shifting action time is less than the first time threshold, set the checking result as that the main gearbox position is currently empty;

[0069] If the gear shifting action time is greater than the first time threshold, close the valve, then wait for a manually preset waiting period; meanwhile, add 1 to the value in a gear shifting unsuccessful counter; the initial value in the gear shifting unsuccessful counter is 0; then execute S412;

[0070] S412. The value in the unsuccessful shifting counter is compared with a first trial number threshold value preset manually; and then the following operation is performed according to the comparison result:

[0071] If the value in the unsuccessful shifting counter is less than the first trial number threshold value, the process returns and S411 is performed again;

[0072] If the value in the unsuccessful shifting counter is not less than the first trial number threshold value, the check result is set as the main box position being currently not empty, and the value in the unsuccessful shifting counter is set to 0.

[0073] Preferably, S420 further comprises the following steps:

[0074] S421. The rear sub-gearbox is shifted to the high gear, and the shifting time is compared with a second time threshold value preset manually; and then the following operation is performed according to the comparison result:

[0075] If the shifting time is less than the second time threshold value, the check result is set as the rear sub-gearbox position being currently the high gear;

[0076] If the shifting time is greater than the second time threshold value, the valve is closed, and then the process waits for a waiting period; meanwhile, the value in the unsuccessful shifting counter is increased by 1, and the initial value in the unsuccessful shifting counter is 0; and then S422 is performed;

[0077] S422. The value in the unsuccessful shifting counter is compared with a second trial number threshold value preset manually; and then the following operation is performed according to the comparison result:

[0078] If the value in the unsuccessful shifting counter is less than the second trial number threshold value, the process returns and S421 is performed again;

[0079] If the value in the unsuccessful shifting counter is not less than the second trial number threshold value, the check result is set as the rear sub-gearbox position being currently not the high gear.

[0080] Preferably, S430 further comprises the following steps:

[0081] S431. The front sub-gearbox is shifted to the empty gear, and the shifting time is compared with a third time threshold value preset manually; and then the following operation is performed according to the comparison result:

[0082] If the shifting time is less than the third time threshold value, the check result is set as the front sub-gearbox position being currently the empty gear;

[0083] If the gear shifting action time is greater than the third time threshold, then close the valve, and wait for a waiting period; meanwhile, increase the value in the gear shifting unsuccessful counter by 1; the initial value in the gear shifting unsuccessful counter is 0; then execute S432;

[0084] S432. The value in the gear shifting unsuccessful counter is compared with a third trial number threshold preset by a human being; then according to the comparison result, the following operations are performed:

[0085] If the value in the gear shifting unsuccessful counter is less than the third trial number threshold, then return and execute S431 again;

[0086] If the value in the gear shifting unsuccessful counter is not less than the third trial number threshold, then set the check result as the current position of the front auxiliary gearbox is not empty; meanwhile, set the value in the gear shifting unsuccessful counter to 0.

[0087] Preferably, during the towing process of S600-S800, the towing gear position, vehicle speed and vehicle approaching distance are also monitored; and the vehicle speed and the vehicle approaching distance are ensured to satisfy the following conditions:

[0088] The vehicle speed is not higher than a maximum towing speed preset by a human being, and the vehicle approaching distance is not higher than a maximum towing distance preset by a human being.

[0089] Preferably, the judgment on whether the current state of the vehicle satisfies the preconditions of the towing function in S100 is realized by a transmission control unit TCU;

[0090] The realization of whether the transmission electromagnetic valve reports the fault information in S200 is realized by the transmission control unit TCU;

[0091] The minimum vehicle voltage threshold is 22V; and the minimum vehicle air pressure threshold is 3bar.

[0092] Preferably, the first trial number threshold is 3 times; the second trial number threshold is 3 times; and the third trial number threshold is 3 times;

[0093] The first time threshold is 0.6s; the second time threshold is 0.6s; and the third time threshold is 0.6s;

[0094] The waiting period is 1s;

[0095] The maximum towing speed is 50km / h; and the maximum towing distance is 100km.

[0096] Compared with the prior art, the present application has the following advantages:

[0097] 1. Because this invention designs a special protection method for the state of the AMT transmission during towing, it avoids the predicament of forced towing, prevents the transmission from being unable to be adequately lubricated, and prevents gear burning and transmission damage.

[0098] 2. Because this invention designs a special protection method for the state of the AMT transmission during towing, when a vehicle safety failure occurs, the transmission towing function can be manually activated for towing, thus meeting the need for towing the vehicle without disassembling the drive shaft and without damaging the transmission. Attached Figure Description

[0099] Figure 1 This is a schematic diagram of the method flow of a specific embodiment of the present invention. Detailed Implementation

[0100] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0101] like Figure 1 As shown, an AMT transmission trailer function protection method includes the following steps:

[0102] S100. Determine whether the current vehicle status meets the pre-set conditions for the towing function; then, based on the determination result, perform the following operations:

[0103] If the determination result is that the current vehicle status does not meet the prerequisites for trailer function, then return and execute S100 again.

[0104] If the determination result is that the current vehicle status meets the prerequisites for trailer function, then execute S200.

[0105] In this specific embodiment, in S100, the transmission control unit (TCU) is used to determine whether the current state of the vehicle meets the prerequisites for the trailer function.

[0106] In this specific embodiment, determining whether the current vehicle's status meets the prerequisites for the towing function in S100 includes the following steps:

[0107] S110. Obtain vehicle air pressure and vehicle voltage values.

[0108] S120. Compare the vehicle voltage value with the manually preset minimum vehicle voltage threshold; then perform the following operations based on the comparison result:

[0109] If the vehicle voltage value is less than the vehicle voltage minimum threshold value, the result of the judgment is set as the state of the current vehicle does not satisfy the precondition of the trailer function, and then the process returns to and executes S110 again.

[0110] If the vehicle voltage value is not less than the vehicle voltage minimum threshold value, S130 is executed.

[0111] S130. The vehicle air pressure value is compared with the manually preset vehicle air pressure minimum threshold value, and then the following operation is performed according to the comparison result:

[0112] If the vehicle air pressure value is less than the vehicle air pressure minimum threshold value, S140 is executed.

[0113] If the vehicle air pressure value is not less than the vehicle air pressure minimum threshold value, the result of the judgment is set as the state of the current vehicle satisfies the precondition of the trailer function.

[0114] The vehicle voltage minimum threshold value is 22V, and the vehicle air pressure minimum threshold value is 3bar.

[0115] S140. The engine is started to perform the inflation operation, and then timing is started until the system air pressure low alarm is removed, and then the engine is turned off and powered on again, and S130 is executed again.

[0116] S200. It is judged whether the gearbox electromagnetic valve has reported a fault information, and then the following operation is performed according to the judgment result:

[0117] If the judgment result is that the gearbox electromagnetic valve has reported a fault information, the process returns to and executes S100 again.

[0118] If the judgment result is that the gearbox electromagnetic valve has not reported a fault information, S300 is executed.

[0119] In the embodiment, whether the gearbox electromagnetic valve has reported a fault information is realized by the gearbox control unit TCU in S200.

[0120] S300. The driver is informed to manually execute the trailer mode, and then it is checked whether the trailer mode is executed completely, and then the following operation is performed according to the checking result:

[0121] If the checking result is that the trailer mode is not executed completely, the process returns to and executes S300 again.

[0122] If the checking result is that the trailer mode has been executed completely, S400 is executed.

[0123] In the embodiment, the trailer mode specifically includes the following steps:

[0124] S310. The driver determines that the vehicle is currently in a stationary state.

[0125] S320. The driver rotates the key to the ON position to power on the vehicle.

[0126] S330. The driver shifts the gear lever to the NEUTRAL position.

[0127] S400. The trailer function activation procedure is executed. Then, it is checked whether the trailer function activation procedure is successfully executed. Then, according to the checking result, the following operations are performed:

[0128] If the checking result is that the trailer function activation procedure is not successfully executed, return and execute S400 again.

[0129] If the checking result is that the trailer function activation procedure is successfully executed, execute S500.

[0130] In this embodiment, the trailer function activation procedure in S400 specifically includes the following steps:

[0131] S410. The main gear position is checked. Then, according to the checking result, the following operations are performed:

[0132] If the checking result is that the main gear position is not currently in the NEUTRAL position, the checking result is set to that the trailer function activation procedure is not successfully executed. Then, return and execute S410 again.

[0133] If the checking result is that the main gear position is currently in the NEUTRAL position, execute S420.

[0134] In this embodiment, S410 further includes the following steps:

[0135] S411. The main gear is shifted. Then, the shifting time is compared with a first time threshold value preset by a human being. Then, according to the comparison result, the following operations are performed:

[0136] If the shifting time is less than the first time threshold value, the checking result is set to that the main gear position is currently in the NEUTRAL position.

[0137] If the shifting time is greater than the first time threshold value, the valve is closed, and then a waiting period is waited for a time length preset by a human being. Meanwhile, the value in a shifting unsuccessful counter is increased by 1. The initial value in the shifting unsuccessful counter is 0. Then, execute S412.

[0138] In this embodiment, the first time threshold value is 0.6 s.

[0139] In this embodiment, the time length of the waiting period is 1 s.

[0140] S412. The value in the shifting unsuccessful counter is compared with a first trial number threshold value preset by a human being. Then, according to the comparison result, the following operations are performed:

[0141] If the value in the unsuccessful shifting counter is less than the first trial number threshold, return and execute S411 again.

[0142] If the value in the unsuccessful shifting counter is not less than the first trial number threshold, set the check result as the current neutral position of the main gearbox is not empty NEUTRAL; and set the value in the unsuccessful shifting counter to 0.

[0143] In this embodiment, the first trial number threshold is 3.

[0144] S420. Shift the rear gearbox to the high gear HIGH; then check the rear gearbox position; and then according to the check result, perform the following operations:

[0145] If the check result is that the current rear gearbox position is not the high gear HIGH, set the check result as the trailer function activation process is not successfully executed; then return and execute S420 again.

[0146] If the check result is that the current rear gearbox position is the high gear HIGH, execute S430.

[0147] In this embodiment, S420 further comprises the following steps:

[0148] S421. Perform a shifting action on the rear gearbox, and the target gear is the high gear HIGH; then compare the shifting action time with a second time threshold preset by the human; and then according to the comparison result, perform the following operations:

[0149] If the shifting action time is less than the second time threshold, set the check result as the current rear gearbox position is the high gear HIGH.

[0150] If the shifting action time is greater than the second time threshold, close the valve, and then wait for a waiting period; and at the same time, add 1 to the value in the unsuccessful shifting counter; the initial value in the unsuccessful shifting counter is 0; then execute S422.

[0151] In this embodiment, the second time threshold is 0.6s.

[0152] S422. Compare the value in the unsuccessful shifting counter with a second trial number threshold preset by the human; and then according to the comparison result, perform the following operations:

[0153] If the value in the unsuccessful shifting counter is less than the second trial number threshold, return and execute S421 again.

[0154] If the value in the unsuccessful shifting counter is not less than the second trial number threshold, set the check result as the current rear gearbox position is not the high gear HIGH.

[0155] In the embodiment, the second threshold of the number of trial and error is 3 times.

[0156] S430. Switch the front auxiliary gearbox to neutral position NEUTRAL; then check the front auxiliary gearbox position; and then according to the checking result, the following operations are made:

[0157] If the checking result is that the front auxiliary gearbox position is not currently in neutral position NEUTRAL, the checking result is set as that the trailer function activation process is not successfully executed; then return and execute S430 again.

[0158] If the checking result is that the front auxiliary gearbox position is currently in neutral position NEUTRAL, S440 is executed.

[0159] In the embodiment, S430 further comprises the following steps:

[0160] S431. Perform a gear engagement action on the front auxiliary gearbox, and the target gear position is neutral position NEUTRAL; then compare the gear engagement action time with a third threshold of time preset by human; and then according to the comparison result, the following operations are made:

[0161] If the gear engagement action time is less than the third threshold of time, the checking result is set as that the front auxiliary gearbox position is currently in neutral position NEUTRAL.

[0162] If the gear engagement action time is greater than the third threshold of time, close the valve, and then wait for a waiting period; meanwhile, the value in the gear engagement unsuccessful counter is added by 1; the initial value in the gear engagement unsuccessful counter is 0; then S432 is executed.

[0163] In the embodiment, the third threshold of time is 0.6s.

[0164] S432. Compare the value in the gear engagement unsuccessful counter with a third threshold of the number of trial and error preset by human; and then according to the comparison result, the following operations are made:

[0165] If the value in the gear engagement unsuccessful counter is less than the third threshold of the number of trial and error, return and execute S431 again.

[0166] If the value in the gear engagement unsuccessful counter is not less than the third threshold of the number of trial and error, the checking result is set as that the front auxiliary gearbox position is not currently in neutral position NEUTRAL; meanwhile, the value in the gear engagement unsuccessful counter is set to 0.

[0167] In the embodiment, the third threshold of the number of trial and error is 3 times.

[0168] S440. Engage the main gearbox into 3rd gear; then check whether the main gearbox is successfully engaged into 3rd gear; and then according to the checking result, the following operations are made:

[0169] If the checking result is that the main gearbox fails to be successfully engaged into 3rd gear, S450 is executed.

[0170] If the result of the check is that the main gearbox is successfully engaged in 3rd gear, the result of the check is set to the operation of the trailer function activation process being successful; then S500 is executed.

[0171] It should be noted that the purpose of first attempting to engage 3rd gear in S440 is to improve the efficiency of the trailer.

[0172] S450. The main gearbox is engaged in 2nd gear; then it is checked whether the main gearbox is successfully engaged in 2nd gear; then the following operations are performed according to the result of the check:

[0173] If the result of the check is that the main gearbox is not successfully engaged in 2nd gear, S460 is executed.

[0174] If the result of the check is that the main gearbox is successfully engaged in 2nd gear, the result of the check is set to the operation of the trailer function activation process being successful; then S500 is executed.

[0175] S460. The main gearbox is engaged in 1st gear; then it is checked whether the main gearbox is successfully engaged in 1st gear; then the following operations are performed according to the result of the check:

[0176] If the result of the check is that the main gearbox is not successfully engaged in 1st gear, S470 is executed.

[0177] If the result of the check is that the main gearbox is successfully engaged in 1st gear, the result of the check is set to the operation of the trailer function activation process being successful; then S500 is executed.

[0178] S470. The result of the check is set to the operation of the trailer function activation process not being successfully executed; then S400 is returned and executed again.

[0179] S500. It is checked whether the trailer gear is successfully engaged; then the following operations are performed according to the result of the check:

[0180] If the result of the check is that the trailer gear is not successfully engaged, the trailer mode is closed; at the same time, an alarm of “trailer mode closed” is issued; then S800 is executed.

[0181] If the result of the check is that the trailer gear is successfully engaged, a prompt of “trailer function activated” is issued; then S600 is executed.

[0182] S600. During the trailer process, the gearbox gear is monitored in real time; then the following operations are performed according to the result of the monitoring:

[0183] If the result of the monitoring is that the gearbox does not disengage, S700 is executed.

[0184] If the result of the monitoring is that the gearbox disengages, an alarm of disengagement is issued; then S800 is executed.

[0185] S700. Check whether the trailer has been completed; then according to the check result, the following operations are made:

[0186] If the check result is that the trailer has been completed, S800 is executed.

[0187] If the check result is that the trailer has not been completed, return and execute S600 again.

[0188] S800. End the flow of the trailer function protection method.

[0189] In the trailer process of S600-S800 in the specific embodiment, the trailer gear, vehicle speed and vehicle distance are also monitored; and the vehicle speed and vehicle distance are ensured to meet the following conditions:

[0190] The vehicle speed is not higher than the maximum towing speed manually preset, and the vehicle distance is not higher than the maximum towing distance manually preset.

[0191] In the specific embodiment, the maximum towing speed is 50km / h; and the maximum towing distance is 100km.

[0192] It should be noted that in the process of towing, the maximum towing speed and the maximum towing distance should not be exceeded through the instrument panel display, the display screen display and the voice broadcast prompt.

[0193] In the above detailed description, various features are combined together in a single embodiment to simplify the disclosure. Such disclosed methods should not be interpreted as reflecting an intention that the claimed subject matter requires more features than are explicitly stated in each claim. On the contrary, the appended claims, as reflected in the claims section below, reflect the general inventive principles of the present application. Thus, the disclosure is not to be interpreted that the claimed subject matter requires more features than are explicitly stated in each claim. Accordingly, the claims section is hereby expressly incorporated into the detailed description as part of the disclosure.

[0194] In order for any person skilled in the art to implement or use the present application, the above discloses the disclosed embodiments. For those skilled in the art, various modifications of the embodiments are obvious, and the general principles defined herein can also be applied to other embodiments without departing from the spirit and protection scope of the disclosure. Therefore, the disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present disclosure.

[0195] The above description includes examples of one or more embodiments. Of course, not all possible combinations of components or methods described above will be employed to make or use the embodiments nor will all of

[0196] The above description is included to illustrate the operation of and advantages of the present application and is not meant to limit or define the only embodiments of the inventive subject matter. The scope of the inventive subject matter encompasses all changes, modifications and alterations of the inventive concepts disclosed and applied to the inventive principles of the present application as would be or are reasonably inferable by one with average skill in the art, who would become further familiar with the teaching of the present application after an understanding of the foregoing detailed description.

Claims

1. An AMT transmission trailer function protection method, characterized in that: Comprising the following steps: S100. Determine whether the current vehicle state meets the manual preset trailer function precondition; then according to the judgment result, the following operations are performed: If the judgment result is that the current vehicle state does not meet the trailer function precondition, return and execute S100 again; If the judgment result is that the current vehicle state meets the trailer function precondition, execute S200; S200. Determine whether the gearbox solenoid valve has reported a fault information, and then according to the judgment result, the following operations are performed: If the judgment result is that the gearbox solenoid valve has reported the fault information, return and execute S100 again; If the judgment result is that the gearbox solenoid valve has not reported the fault information, execute S300; S300. Inform the driver to manually execute the trailer mode; then check whether the trailer mode has been executed; then according to the check result, the following operations are performed: If the check result is that the trailer mode has not been executed, return and execute S300 again; If the check result is that the trailer mode has been executed, execute S400; S400. Execute the trailer function activation process; then check whether the trailer function activation process is executed successfully; then according to the check result, the following operations are performed: If the check result is that the trailer function activation process is not executed successfully, return and execute S400 again; If the check result is that the trailer function activation process is executed successfully, execute S500; S500. Check whether the trailer gear is engaged successfully; then according to the check result, the following operations are performed: If the check result is that the trailer gear is not engaged successfully, close the trailer mode; at the same time, issue a "trailer mode closed" alarm; then execute S800; If the check result is that the trailer gear is engaged successfully, issue a prompt "trailer function activated"; then execute S600; S600. During the trailer process, the gearbox gear position is monitored in real time; then according to the monitoring result, the following operations are performed: If the monitoring result is that the gearbox does not occur out of gear, execute S700; If the monitoring result is that the gearbox occurs out of gear, issue an out-of-gear alarm, and then execute S800; S700. Check whether the trailer has been completed; then according to the check result, the following operations are performed: If the check result is that the trailer has been completed, execute S800; If the check result is that the trailer has not been completed, return and execute S600 again; S800. End the flow of the trailer function protection method.

2. The AMT gearbox trailer function protection method according to claim 1, comprising the following steps: the determination in S100 whether the current vehicle state meets the trailer function precondition specifically comprises the following steps: S110. Obtain the vehicle air pressure value and the vehicle voltage value; S120. Compare the vehicle voltage value with the manually preset vehicle voltage minimum threshold value; then according to the comparison result, the following operations are performed: If the vehicle voltage value is less than the vehicle voltage minimum threshold value, the judgment result is that the current vehicle state does not meet the trailer function precondition, and then return and execute S110 again; If the vehicle voltage value is not less than the vehicle voltage minimum threshold, S130 is performed; S130. Comparing the vehicle air pressure value with a manually preset vehicle air pressure minimum threshold; and then making the following operation according to the comparison result: If the vehicle air pressure value is less than the vehicle air pressure minimum threshold, S140 is performed; If the vehicle air pressure value is not less than the vehicle air pressure minimum threshold, the result of the judgment is that the state of the current vehicle satisfies the precondition of the trailer function; S140. Starting the engine to perform the inflation operation; then starting the timing until the system air pressure low alarm is removed; then turning off the engine and powering on, and then performing S130 again.

3. The AMT transmission trailer function protection method of claim 2, wherein: The trailer mode specifically includes the following steps: S310. The driver determines that the vehicle is currently in a stationary state; S320. The driver twists the lock key to the ON gear to realize the power-on; S330. The driver hangs the gearbox handle into the neutral gear.

4. The AMT transmission trailer function protection method of claim 3, wherein: The trailer function activation process in S400 specifically includes the following steps: S410. Checking the main gearbox position; and then making the following operation according to the checking result: If the checking result is that the main gearbox position is not currently in the neutral gear, the checking result is that the trailer function activation process is not successfully performed; then returning and performing S410 again; If the checking result is that the main gearbox position is currently in the neutral gear, S420 is performed; S420. Switching the rear auxiliary gearbox to the high gear; then checking the rear auxiliary gearbox position; and then making the following operation according to the checking result: If the checking result is that the rear auxiliary gearbox position is not currently in the high gear, the checking result is that the trailer function activation process is not successfully performed; then returning and performing S420 again; If the checking result is that the rear auxiliary gearbox position is currently in the high gear, S430 is performed; S430. Switching the front auxiliary gearbox to the neutral gear; then checking the front auxiliary gearbox position; and then making the following operation according to the checking result: If the checking result is that the front auxiliary gearbox position is not currently in the neutral gear, the checking result is that the trailer function activation process is not successfully performed; then returning and performing S430 again; If the checking result is that the front auxiliary gearbox position is currently in the neutral gear, S440 is performed; S440. Hanging the main gearbox into the 3 gear; then checking whether the main gearbox is successfully hung into the 3 gear; and then making the following operation according to the checking result: If the checking result is that the main gearbox fails to be successfully hung into the 3 gear, S450 is performed; If the checking result is that the main gearbox is successfully hung into the 3 gear, the checking result is that the trailer function activation process is successfully performed; then S500 is performed; S450. Hanging the main gearbox into the 2 gear; then checking whether the main gearbox is successfully hung into the 2 gear; and then making the following operation according to the checking result: If the checking result is that the main gearbox fails to be successfully hung into the 2 gear, S460 is performed; If the checking result is that the main gearbox is successfully hung into the 2 gear, the checking result is that the trailer function activation process is successfully performed; then S500 is performed; S460. Hanging the main gearbox into the 1 gear; then checking whether the main gearbox is successfully hung into the 1 gear; and then making the following operation according to the checking result: If the check result is that the main gearbox fails to engage 1st gear, S470 is executed; If the check result is that the main gearbox successfully engages 1st gear, the check result is set as that the trailer function activation process is successfully executed; then S500 is executed; S470. The check result is set as that the trailer function activation process fails to be successfully executed; Then return and execute S400 again.

5. The AMT transmission trailer function protection method of claim 4, wherein: S410 further comprises the following steps: S411. Perform a gear shifting action on the main gearbox; then compare the gear shifting action time with a first time threshold value preset by a human; and then make the following operation according to the comparison result: If the gear shifting action time is less than the first time threshold value, set the check result as that the main gearbox position is currently in neutral gear; If the gear shifting action time is greater than the first time threshold value, close the valve, then wait for a waiting period time preset by a human; and at the same time, increase the value in a gear shifting unsuccessful counter by 1; the initial value in the gear shifting unsuccessful counter is 0; then execute S412; S412. Compare the value in the gear shifting unsuccessful counter with a first trial and error number threshold value preset by a human; and then make the following operation according to the comparison result: If the value in the gear shifting unsuccessful counter is less than the first trial and error number threshold value, return and execute S411 again; If the value in the gear shifting unsuccessful counter is not less than the first trial and error number threshold value, set the check result as that the main gearbox position is currently not in neutral gear; and at the same time, set the value in the gear shifting unsuccessful counter to 0.

6. The AMT transmission trailer function protection method of claim 5, wherein: S420 further comprises the following steps: S421. Perform a gear engaging action on the rear auxiliary gearbox, and the target gear is high gear; then compare the gear engaging action time with a second time threshold value preset by a human; and then make the following operation according to the comparison result: If the gear engaging action time is less than the second time threshold value, set the check result as that the rear auxiliary gearbox position is currently in high gear; If the gear engaging action time is greater than the second time threshold value, close the valve, then wait for a waiting period time; and at the same time, increase the value in a gear engaging unsuccessful counter by 1; the initial value in the gear engaging unsuccessful counter is 0; then execute S422; S422. Compare the value in the gear engaging unsuccessful counter with a second trial and error number threshold value preset by a human; and then make the following operation according to the comparison result: If the value in the gear engaging unsuccessful counter is less than the second trial and error number threshold value, return and execute S421 again; If the value in the gear engaging unsuccessful counter is not less than the second trial and error number threshold value, set the check result as that the rear auxiliary gearbox position is currently not in high gear.

7. The AMT transmission trailer function protection method of claim 6, wherein: S430 further comprises the following steps: S431. Perform a gear engaging action on the front auxiliary gearbox, and the target gear is neutral gear; then compare the gear engaging action time with a third time threshold value preset by a human; and then make the following operation according to the comparison result: If the gear engaging action time is less than the third time threshold value, set the check result as that the front auxiliary gearbox position is currently in neutral gear; If the gear engaging action time is greater than the third time threshold value, close the valve, then wait for a waiting period time; and at the same time, increase the value in a gear engaging unsuccessful counter by 1; the initial value in the gear engaging unsuccessful counter is 0; then execute S432; If the shift action time is greater than the third time threshold, then close the valve and wait for a waiting period, and meanwhile, increase the value in the unsuccessful shift counter by 1, wherein the initial value in the unsuccessful shift counter is 0; then perform S432; S432. Compare the value in the unsuccessful shift counter with a third trial number threshold set by a user, and then perform the following operations according to the comparison result: If the value in the unsuccessful shift counter is less than the third trial number threshold, then return to and perform S431 again; If the value in the unsuccessful shift counter is not less than the third trial number threshold, then set the check result as the current position of the front auxiliary gearbox is not empty; Meanwhile, set the value in the unsuccessful shift counter to 0.

8. The AMT transmission trailer function protection method of claim 7, wherein: During the trailer process in S600-S800, the trailer gear position, vehicle speed and vehicle approach distance are also monitored, and the vehicle speed and the vehicle approach distance are ensured to satisfy the following conditions: The vehicle speed is not higher than a maximum towing speed set by a user, and the vehicle approach distance is not higher than a maximum towing distance set by a user.

9. The AMT gearbox trailer function protection method of claim 8, wherein: In S100, the state of the current vehicle is determined by the gearbox control unit TCU to see whether the preconditions of the trailer function are met; In S200, the gearbox electromagnetic valve is determined by the gearbox control unit TCU to see whether the fault information is reported; The minimum vehicle voltage threshold is 22V, and the minimum vehicle air pressure threshold is 3 bar.

10. The AMT transmission trailer function protection method of claim 9, wherein: The first trial number threshold is 3 times, the second trial number threshold is 3 times, and the third trial number threshold is 3 times; The first time threshold is 0.6s, the second time threshold is 0.6s, and the third time threshold is 0.6s; The waiting period is 1s; The maximum towing speed is 50km / h, and the maximum towing distance is 100km.

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