An in-cylinder brake AMT shift control method, system, device and medium for realizing brake force grading

Abstract

The application provides a cylinder braking AMT shift control method, system, device and medium for realizing brake force grading, and belongs to the technical field of vehicle shift control. The method steps are as follows: the negative torque of vehicle braking is divided into cylinder braking levels in advance, and an AMT shift strategy is formulated according to the levels; when the vehicle is on a downhill road and the cylinder braking switch is turned on, the brake negative torque switch state is obtained, the cylinder braking is turned on when the conditions are met, and the negative torque range is determined according to the brake negative torque switch state; the cylinder braking level is determined according to the negative torque range, and the AMT shift strategy is matched; when the cylinder braking force is greater than the brake force threshold and the accelerator is not stepped on, the downshift instruction is sent according to the matched AMT shift strategy, the engine speed and the brake force are increased, and the vehicle is controlled to travel at a constant speed or at a deceleration speed by using the increased brake force. The AMT shift control strategy based on the cylinder braking brake force grading improves the cylinder braking brake force.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle gear shifting control, and particularly relates to a cylinder brake AMT gear shifting control method, system, device and medium for realizing brake force grading. BACKGROUND

[0002] Heavy trucks are not only on a flat road in the actual transportation process, but often encounter various slope changes. In fact, different slopes have different demands for vehicle braking force. The traditional AMT gear shifting control strategy is usually a single form of gear shifting control method, which cannot meet the different braking force demands of the driver in most downhill working conditions. For example, when the downhill slope is large, the single gear shifting control method cannot respond in time, and the engine speed cannot be quickly adjusted to the required speed range of the cylinder brake, resulting in the vehicle accelerating and sliding under the action of gravity, and the vehicle speed increasing faster and faster, which seriously threatens the safety of the vehicle. On the contrary, when the downhill slope is small, the engine speed request is high, and the high engine speed request will result in excessive braking force and rapid deceleration of the vehicle. On the one hand, it affects the ride comfort, and on the other hand, in order to maintain the stable speed of the vehicle during the downhill process, the driver may need to frequently step on the accelerator pedal to adjust the engine speed and braking force. Such high-frequency operation increases the operation burden of the driver, which not only easily leads to driving fatigue, but also leads to operation errors, and there is a driving safety hazard.

[0003] Therefore, in view of the above defects in the prior art, it is necessary to provide a cylinder brake AMT gear shifting control method, system, device and medium for realizing brake force grading. SUMMARY

[0004] In view of the above defects in the prior art that the traditional single AMT gear shifting control strategy cannot meet the braking force demands of different working conditions when the vehicle is downhill, the application provides a cylinder brake AMT gear shifting control method, system, device and medium for realizing brake force grading to solve the above technical problems.

[0005] In the first aspect, the application provides a cylinder brake AMT gear shifting control method for realizing brake force grading, comprising the following steps:

[0006] S1. Dividing the negative torque of vehicle braking into cylinder brake levels in advance, and formulating an AMT gear shifting strategy for cylinder braking of each level;

[0007] S2. When the vehicle is on a downhill road and the cylinder brake switch is turned on, acquiring the brake negative torque switch state, and turning on the cylinder brake when the conditions are met, and determining the negative torque range according to the brake negative torque switch state;

[0008] S3. Determine the cylinder braking level according to the determined negative torque range, and match the AMT shift strategy for the cylinder braking level;

[0009] S4. When the cylinder braking force is greater than the braking force threshold and the accelerator is not pressed, issue a downshift command according to the matched AMT shift strategy, increase the engine speed and braking force, and use the increased braking force to control the vehicle to travel at a constant speed or decelerate.

[0010] Further, the specific steps of step S1 are as follows:

[0011] S11. Divide the cylinder braking levels according to the engine negative torque percentage during vehicle braking in advance;

[0012] S12. For each level of cylinder braking, determine the downshift target speed corresponding to the different original speeds of the engine in each gear as the AMT shift strategy, and generate a table.

[0013] Further, the engine negative torque of 30% is used as the first level of cylinder braking, the engine negative torque of 50% is used as the second level of cylinder braking, the engine negative torque of 70% is used as the third level of cylinder braking, and the engine negative torque of 100% is used as the fourth level of cylinder braking;

[0014] In each level of AMT shift strategy, the downshift target speed corresponding to the different original speeds of the engine is determined for gears 1-16.

[0015] Further, the specific steps of step S2 are as follows:

[0016] S21. Determine whether the brake switch is on in downhill road conditions;

[0017] If yes, go to step S22;

[0018] If no, return to step S21;

[0019] S22. Obtain the brake negative torque switch state and determine whether the brake downshift torque increase function condition is met;

[0020] If yes, go to step S23;

[0021] If no, return to step S21;

[0022] S23. Start cylinder braking and go to step S4;

[0023] S24. Determine the negative torque range according to the brake negative torque switch state.

[0024] Further, the brake negative torque switch state includes vehicle speed signal state, vehicle weight signal state, and slope signal.

[0025] Further, the specific steps of step S3 are as follows:

[0026] S31. Corresponding engine negative torque percentage of the determined negative torque range to the preset cylinder braking level is not matched, and it is determined that the AMT shift strategy table needs to be used;

[0027] S32. The actual gear of the vehicle is obtained, and the AMT shift strategy table to be used is determined to determine the downshift target speed.

[0028] Further, the step S4 is specifically as follows:

[0029] S41. It is judged whether the cylinder braking force is greater than the braking force threshold;

[0030] If yes, go to step S42;

[0031] If no, return to step S21;

[0032] S42. It is judged whether the accelerator is not stepped on;

[0033] If yes, go to step S43;

[0034] If no, wait for a set period of time and return to step S42;

[0035] S43. The downshift target speed of the found AMT shift strategy is obtained, and a downshift instruction is generated according to the downshift target speed and sent to the engine;

[0036] S44. The engine speed is raised to the downshift target speed, the braking force is raised, and the raised braking force is used to control the vehicle to travel at a constant speed or decelerate.

[0037] In a second aspect, the present application provides an in-cylinder brake AMT shift control system for realizing in-cylinder brake force grading, comprising:

[0038] An AMT shift strategy braking module is used to pre-divide the negative torque of vehicle braking into cylinder braking levels, and to formulate AMT shift strategies for cylinder braking of each level;

[0039] An in-cylinder brake opening and negative torque range determination module is used to obtain the braking negative torque on-off state when the downhill road condition and the in-cylinder brake switch are opened, and to open the in-cylinder brake when the conditions are met, and to determine the negative torque range according to the braking negative torque on-off state;

[0040] An AMT shift strategy matching module is used to determine the in-cylinder brake level according to the determined negative torque range, and to match the AMT shift strategy of the in-cylinder brake level;

[0041] The hierarchical braking module is used to issue a downshift instruction according to a matched AMT shift strategy, increase the engine speed and the braking force, and control the vehicle to travel at a constant speed or at a deceleration speed by using the increased braking force when the in-cylinder braking force is greater than a braking force threshold and the accelerator is not depressed.

[0042] In a third aspect, the present application provides a device comprising a processor and a memory;

[0043] The memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the device executes the method of the first aspect.

[0044] In a fourth aspect, the present application provides a storage medium,

[0045] The storage medium stores instructions, which, when executed on a computer, cause the computer to execute the method of the first aspect.

[0046] The present application has the following beneficial effects:

[0047] The in-cylinder braking AMT shift control method, system, device and medium provided by the present application increase a set of AMT shift control strategy for in-cylinder braking force grading on the basis of the original shift control strategy, judge the required negative torque of the driver, select the appropriate AMT shift control strategy according to the in-cylinder braking switch state quantity, the required negative torque, the actual gear and the accelerator state, increase the engine speed to the required in-cylinder braking speed according to the actual engine speed, and achieve the effect of increasing the in-cylinder braking force, so that the vehicle can travel at a constant speed or at a deceleration speed on a downhill, and meet the braking force requirements of the driver in different downhill conditions.

[0048] In addition, the design principle of the present application is reliable, the structure is simple, and the present application has very wide application prospects.

[0049] Therefore, compared with the prior art, the present application has outstanding substantial characteristics and significant progress, and the beneficial effects of the implementation are also obvious. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0051] Figure 1 is a flowchart of the in-cylinder braking AMT shift control method of the present application.

[0052] Figure 2 is a schematic diagram of the cylinder braking AMT shift control system of the present application for realizing brake force grading.

[0053] Figure 3 is a schematic diagram of the AMT control strategy of the present application. DETAILED DESCRIPTION

[0054] The cylinder braking AMT shift control method for realizing cylinder braking force grading can be applied to one or more devices, which is a device capable of automatically performing numerical calculation and / or information processing according to pre-set or stored instructions, and the hardware thereof includes but is not limited to microprocessors, application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0055] The device can be any electronic product capable of human-computer interaction with the user, such as a personal computer, a tablet computer, a smart phone, a personal digital assistant (PDA), an interactive Internet Protocol Television (IPTV), etc. The network in which the device is located includes but is not limited to the Internet, a wide area network, a metropolitan area network, a local area network, a virtual private network (VPN), etc.

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the scope of protection of the present application.

[0057] Please refer to Figure 1 shown is a cylinder braking AMT shift control method for realizing brake force grading in a specific implementation, comprising the following steps:

[0058] 1. The negative torque of vehicle braking is divided into cylinder braking levels in advance, and an AMT shift strategy is formulated for cylinder braking of each level;

[0059] S2. When the downhill road condition and the cylinder braking switch are turned on, the braking negative torque on-off state is obtained, and the cylinder braking is turned on when the conditions are met, and the negative torque range is determined according to the braking negative torque on-off state;

[0060] S3. Determine the in-cylinder braking level based on the determined negative torque range, and match the AMT shift strategy for the in-cylinder braking level;

[0061] S4. When the in-cylinder braking force is greater than the braking force threshold and the accelerator is not pressed, a downshift command is issued according to the matched AMT shift strategy to increase the engine speed and braking force, and use the increased braking force to control the vehicle to drive at a constant speed or decelerate.

[0062] In this embodiment, step S1 is specifically as follows:

[0063] S11. Pre-determine the in-cylinder braking level based on the percentage of engine negative torque during vehicle braking;

[0064] S12. For each level of in-cylinder braking, determine the downshift target speed corresponding to the different original engine speeds in each gear as the AMT shift strategy, and generate a table;

[0065] like Figure 3 As shown, 30% of the engine's negative torque is used as the first level of in-cylinder braking, 50% of the engine's negative torque is used as the second level of in-cylinder braking, 70% of the engine's negative torque is used as the third level of in-cylinder braking, and 100% of the engine's negative torque is used as the fourth level of in-cylinder braking.

[0066] In each level of AMT shift strategy, the target downshift speed corresponding to the different original engine speeds for gears 1-16 is determined;

[0067] The specific steps of step S2 are as follows:

[0068] S21. On a downhill road, determine whether the brake switch is engaged;

[0069] If so, proceed to step S22;

[0070] If not, return to step S21;

[0071] S22. Obtain the status of the braking negative torque switch and determine whether the conditions for the braking downshift torque increase function are met;

[0072] If so, proceed to step S23;

[0073] If not, return to step S21;

[0074] S23. Engage the cylinder brake and proceed to step S4;

[0075] S24. Determine the negative torque range based on the status of the brake negative torque switch; the status of the brake negative torque switch includes the vehicle speed signal status, the vehicle weight signal status, and the gradient signal.

[0076] The specific steps of step S3 are as follows:

[0077] S31. Corresponding engine negative torque percentage of the determined negative torque range and preset cylinder braking level is not matched, and it is determined that the AMT shift strategy table needs to be used;

[0078] S32. The actual gear of the vehicle is obtained, and the AMT shift strategy table to be used is determined to determine the downshift target speed;

[0079] Step S4 is specifically as follows:

[0080] S41. Determine whether the cylinder braking force is greater than the braking force threshold;

[0081] If yes, go to step S42;

[0082] If no, return to step S21;

[0083] S42. Determine whether the accelerator is not depressed;

[0084] If yes, go to step S43;

[0085] If no, wait for a set period of time and return to step S42;

[0086] S43. Obtain the downshift target speed of the found AMT shift strategy, and generate a downshift command according to the downshift target speed to the engine;

[0087] S44. Increase the engine speed to the downshift target speed, realize the increase of the braking force, and use the increased braking force to control the vehicle to travel at a constant speed or decelerate.

[0088] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0089] The following is an embodiment of the cylinder braking AMT shift control system for realizing cylinder braking force grading provided by the embodiment of the present disclosure. The system belongs to the same inventive concept as the cylinder braking AMT shift control method for realizing cylinder braking force grading described above. Details not described in the embodiment of the cylinder braking AMT shift control system for realizing cylinder braking force grading can be referred to the embodiment of the cylinder braking AMT shift control method for realizing cylinder braking force grading described above.

[0090] As shown in Figure 2 , the system comprises:

[0091] An AMT shift strategy braking module is configured to pre-divide the negative torque of the vehicle braking into cylinder braking levels, and to formulate an AMT shift strategy for each level of cylinder braking;

[0092] The cylinder braking opening and negative torque range determination module is configured to obtain a brake negative torque switch state when the cylinder braking switch is opened on a downhill road condition, and open the cylinder braking when the condition is met, and determine a negative torque range according to the brake negative torque switch state.

[0093] The AMT shift strategy matching module is configured to determine a cylinder braking level according to the determined negative torque range, and match an AMT shift strategy of the cylinder braking level.

[0094] The staged braking module is configured to issue a downshift instruction according to the matched AMT shift strategy when the cylinder braking force is greater than a brake force threshold and the accelerator is not depressed, increase the engine speed and the brake force, and control the vehicle to travel at a constant speed or decelerate using the increased brake force.

[0095] The commercial vehicle non-synchronizer AMT static shift control method provided by the present application is the modules and algorithm steps of each example described in combination with the embodiments disclosed herein, which can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been described in the above description. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0096] Those skilled in the art can understand that the cylinder braking AMT shift control method for realizing cylinder braking force staging provided by the present application can be realized as a system, a method or a program product. Therefore, each aspect of the present disclosure can be embodied as a complete hardware embodiment, a complete software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, which can be collectively referred to as "circuitry", "module" or "system" here.

[0097] In a non-transitory computer-readable storage medium for storing the cylinder braking AMT shift control method for realizing cylinder braking force staging, it can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.

[0098] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various modifications and equivalents can be made by those skilled in the art without departing from the spirit and scope of the application. Any and all modifications and equivalents are intended to be included within the scope of the present application.

Claims

1. An AMT shift control method of cylinder brake that realizes brake force staging, characterized by, The method comprises the following steps: S1. Pre-classify the cylinder braking levels according to the engine negative torque percentage during vehicle braking, and formulate the AMT shift strategy for cylinder braking of each level; S2. When the vehicle is on a downhill road and the cylinder braking switch is on, obtain the brake negative torque switch state, and turn on the cylinder braking when the conditions are met, while determining the negative torque range according to the brake negative torque switch state; S3. Determine the cylinder braking level according to the determined negative torque range, and match the AMT shift strategy for the cylinder braking level; S4. When the cylinder braking force is greater than the brake force threshold and the accelerator is not depressed, issue a downshift instruction according to the matched AMT shift strategy, increase the engine speed and brake force, and use the increased brake force to control the vehicle to travel at a constant speed or at a deceleration; The specific steps of step S1 are as follows: S11. Pre-classify the cylinder braking levels according to the engine negative torque percentage during vehicle braking; S12. Formulate the downshift target speed corresponding to the different original speeds of the engine in each gear as the AMT shift strategy for cylinder braking of each level, and generate a table; The engine negative torque of 30% is the first level of cylinder braking, the engine negative torque of 50% is the second level of cylinder braking, the engine negative torque of 70% is the third level of cylinder braking, and the engine negative torque of 100% is the fourth level of cylinder braking; In the AMT shift strategy of each level, the downshift target speed corresponding to the different original speeds of the engine is determined for gears 1-16; The specific steps of step S2 are as follows: S21. When the vehicle is on a downhill road, determine whether the brake switch is on; If yes, go to step S22; If no, return to step S21; S22. Obtain the brake negative torque switch state and determine whether the brake downshift torque increase function conditions are met; If yes, go to step S23; If no, return to step S21; S23. Turn on the cylinder braking and go to step S24; S24. Determine the negative torque range according to the brake negative torque switch state.

2. The cylinder brake AMT shift control method of implementing brake force staging according to claim 1, characterized by, The brake negative torque switch state includes the vehicle speed signal state, the vehicle weight signal state, and the slope signal.

3. The cylinder brake AMT shift control method of implementing brake force staging according to claim 1, characterized by, The specific steps of step S3 are as follows: S31. Compare the determined negative torque range with the preset engine negative torque percentage corresponding to the cylinder braking level to determine the AMT shift strategy table to be used; S32. Obtain the actual gear of the vehicle, and find the downshift target speed in the AMT shift strategy table to be used.

4. The cylinder brake AMT shift control method of implementing brake force staging according to claim 3, characterized by, The specific steps of step S4 are as follows: S41. Determine whether the cylinder braking force is greater than the brake force threshold; If yes, go to step S42; If no, return to step S21; S42. Determine whether the accelerator is not depressed; If yes, go to step S43; If no, wait for a set period of time and return to step S42; S43. Obtain the downshift target speed of the found AMT shift strategy, and generate a downshift instruction to the engine according to the downshift target speed; S44. Increase the engine speed to the downshift target speed to increase the brake force, and use the increased brake force to control the vehicle to travel at a constant speed or at a deceleration.

5. An apparatus, comprising: The method comprises a processor and a memory; The memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the device executes the method in any one of claims 1-4.

6. A storage medium, characterized in that, The storage medium has instructions stored therein, which, when executed on a computer, cause the computer to execute the method in any one of claims 1-4.

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