Commercial vehicle amt brake skip shift control method, device, equipment and medium

Abstract

The application discloses a commercial vehicle AMT brake skip shift and downshift control method, device, equipment and medium, and belongs to the technical field of AMT control. The method comprises the following steps: determining a shift parameter and an engine optimal economic speed interval according to an engine universal characteristic curve in advance; when the vehicle needs to brake during driving and the engine speed is lower than an idle speed value, determining a target gear position according to the shift parameter and the engine optimal economic speed interval, and performing a shift operation according to the target gear position. According to the brake signal, the transmitter speed, the speed ratio of each gear position of the gearbox and the idle speed, and in combination with the engine universal characteristic curve, the automatic gearbox brake skip shift and downshift control is realized, the defect that a long time is consumed for step-by-step downshift is overcome, the driving safety is ensured, the problem of engine stall caused by the idle speed is avoided, and the stable operation of the vehicle is ensured.

Description

Technical Field

[0001] This invention belongs to the field of AMT control technology, specifically relating to a method, device, equipment, and medium for controlling AMT braking shifting and downshifting in commercial vehicles. Background Technology

[0002] AMT is short for Automated Mechanical Transmission.

[0003] The current AMT braking gear control logic for commercial vehicles is executed sequentially, that is, the gear is gradually increased or decreased according to the demand. This method can ensure smooth vehicle operation and the control logic is simple and easy to implement, but it has the following problems:

[0004] First, when a vehicle is traveling at high speed in a high gear, if emergency braking is required depending on road conditions, it needs to downshift gradually to the required lower gear, which takes a relatively long time and may not meet the emergency braking needs, potentially even causing an accident. Second, after the vehicle has released the brakes and needs to continue moving, if the gear is higher than the highest gear allowed for the current speed, there will be insufficient power, and it may even cause the engine to stall.

[0005] In summary, the control logic of the AMT braking gear sequence in commercial vehicles results in prolonged downshifting during emergency braking, which can easily lead to accidents. Furthermore, if the gear selected to continue driving after the brakes are released is too high, it can easily cause insufficient power or even engine stalling.

[0006] This is a shortcoming of the existing technology. Therefore, in view of the above-mentioned defects in the existing technology, it is very necessary to provide a method, device, equipment and medium for controlling the braking skipping and downshifting of AMT in commercial vehicles. Summary of the Invention

[0007] The existing control logic for sequential execution of braking gears in commercial vehicle AMTs results in prolonged downshifting during emergency braking, which can easily lead to accidents. Furthermore, the gear that is too high after the brakes are released can cause insufficient power or even engine stalling. To address these issues, this invention provides a method, device, equipment, and medium for controlling downshifting and skipping during braking in commercial vehicle AMTs.

[0008] In a first aspect, the present invention provides a method for controlling brake shifting and downshifting in an AMT (Automated Manual Transmission) system for commercial vehicles, comprising the following steps:

[0009] S1. Pre-determine the shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve;

[0010] S2. When braking is required while the vehicle is in motion and the engine speed is lower than the idle speed, the target gear is determined based on the shift parameters and the engine's optimal economic speed range, and the shifting operation is performed according to the target gear.

[0011] Furthermore, the specific steps of step S1 are as follows:

[0012] S11. Pre-determine the shift parameters based on the engine universal characteristic curve; the shift parameters include the braking downshift speed thresholds for all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio.

[0013] S12. Determine the optimal economic speed range of the engine based on the braking downshift speed thresholds of all gears in the transmission under different operating conditions.

[0014] Furthermore, the specific steps of step S2 are as follows:

[0015] S21. Determine whether the transmission control unit has received a braking signal;

[0016] If so, proceed to step S23;

[0017] If not, proceed to step S22;

[0018] S22. Control the vehicle to continue at the original speed and return to step S21;

[0019] S23. When the engine speed is lower than the idle speed and the vehicle is not in a starting state, calculate the speed values ​​of each gear corresponding to the current gear of the transmission;

[0020] S24. Filter out the economic gear speed values ​​that meet the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economic gear speed value, and take the maximum gear as the target gear;

[0021] S25. The transmission controller uses the target gear to perform the shifting operation.

[0022] Furthermore, the specific steps of step S23 are as follows:

[0023] S231. Determine the engine idle speed value and check whether the current engine speed is less than the idle speed value;

[0024] If so, proceed to step S232;

[0025] If not, proceed to step S22;

[0026] S232. Determine whether the current gear of the transmission is greater than or equal to the starting gear;

[0027] If so, proceed to step S233;

[0028] If not, engage first gear in the transmission to end;

[0029] S233. Control the clutch to disengage, and calculate the speed value of each gear based on the vehicle's matched engine idle speed value, the gear ratio of each gear in the transmission, and the current engine speed value.

[0030] Furthermore, the formulas for calculating the engine speed values ​​for each gear are as follows:

[0031]

[0032] in, Vst is the engine speed in one of the other gears, k is the other gear, ik is the gear ratio of gear k, ist is the gear ratio of the current gear, and Vst is the current engine speed.

[0033] Furthermore, the specific steps of step S24 are as follows:

[0034] S241. Sequentially locate the calculated speed values ​​for each gear;

[0035] S242. Determine whether the gear position speed value matches the engine's optimal economic speed range;

[0036] If so, use the positioning speed value as the economic speed value and proceed to step S243;

[0037] If not, discard the gear speed value and proceed to step S243;

[0038] S243. Determine whether the speed values ​​for each gear have been set;

[0039] If so, proceed to step S244;

[0040] If not, locate the speed value for the next gear and return to step S242;

[0041] S244. Determine if an economic speed value exists;

[0042] If so, proceed to step S246;

[0043] If not, proceed to step S245;

[0044] S245. Determining that no target gear exists, control the transmission to engage first gear, and end;

[0045] S246. Determine the gear corresponding to each economic speed value, sort the gears, and use the highest gear as the target gear.

[0046] Secondly, the present invention provides a commercial vehicle AMT brake shifting and downshifting control device, comprising:

[0047] The shift parameter determination module is used to pre-determine the shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve.

[0048] The brake shift control module is used to determine the target gear based on shift parameters and the engine's optimal economic speed range when braking is required during vehicle operation and the engine speed is below idle speed, and then perform the shift operation according to the target gear.

[0049] Furthermore, the shift parameter determination module includes:

[0050] The shift parameter determination unit is used to pre-determine the shift parameters based on the universal characteristic curve of the engine; the shift parameters include the braking downshift speed threshold of all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio.

[0051] The engine optimal economic speed range determination unit is used to determine the engine's optimal economic speed range based on the braking downshift speed threshold of all gears in the transmission under different operating conditions.

[0052] The brake shift control module includes:

[0053] The brake signal determination unit is used to determine whether the transmission control unit has received a brake signal;

[0054] The vehicle speed maintenance control unit is used to control the vehicle to travel at the original speed when no braking signal is received;

[0055] The gearbox speed calculation unit is used to receive the braking signal and calculate the speed value of each gear corresponding to the current gear when the engine speed is lower than the idle speed and the vehicle is not in a starting state.

[0056] The target gear calculation unit is used to filter out the economic gear speed values ​​that meet the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economic gear speed value, and use the maximum gear as the target gear.

[0057] The shift control unit is used to enable the transmission controller to perform shifting operations using the target gear.

[0058] Thirdly, the present invention provides a computer device, including a processor and a memory;

[0059] The memory is used to store computer programs, and the processor is used to retrieve and run the computer programs from the memory, causing the computer device to perform the method described in the first aspect above.

[0060] Fourthly, the present invention provides a storage medium.

[0061] The storage medium stores instructions that, when run on a computer, cause the computer to perform the method described in the first aspect above.

[0062] The beneficial effects of this invention are as follows:

[0063] The present invention provides a method, device, equipment and medium for controlling the braking shifting and downshifting of an automatic transmission (AMT) in commercial vehicles. Based on the braking signal, engine speed, gear ratios of each gear in the transmission and idle speed, and combined with the universal characteristic curve of the engine, the method achieves automatic transmission braking shifting and downshifting control. This overcomes the shortcomings of the long downshifting time, ensures driving safety, avoids the problem of engine stalling caused by idling, and ensures stable vehicle operation.

[0064] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0065] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a flowchart illustrating an embodiment of the commercial vehicle AMT braking shifting and downshifting control method of the present invention.

[0068] Figure 2 This is a flowchart illustrating another embodiment of the commercial vehicle AMT braking shifting and downshifting control method of the present invention.

[0069] Figure 3 This is a schematic diagram of the process for calculating the speed values ​​of each gear corresponding to the current gear position of the transmission according to the present invention.

[0070] Figure 4 This is a schematic diagram of the process for determining the target gear in this invention.

[0071] Figure 5 This is a schematic diagram of the commercial vehicle AMT brake shifting and downshifting control device of the present invention. Detailed Implementation

[0072] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0073] Example 1:

[0074] like Figure 1 As shown, the present invention provides a method for controlling brake shifting and downshifting in a commercial vehicle AMT, comprising the following steps:

[0075] S1. Pre-determine the shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve;

[0076] S2. When braking is required while the vehicle is in motion and the engine speed is lower than the idle speed, the target gear is determined based on the shift parameters and the engine's optimal economic speed range, and the shifting operation is performed according to the target gear.

[0077] Example 2:

[0078] like Figure 2 As shown, the present invention provides a method for controlling brake shifting and downshifting in a commercial vehicle AMT, comprising the following steps:

[0079] S1. Pre-determine the shifting parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve; the specific steps of step S1 are as follows:

[0080] S11. Pre-determine the shift parameters based on the engine universal characteristic curve; the shift parameters include the braking downshift speed thresholds for all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio.

[0081] S12. Determine the optimal economic speed range of the engine based on the braking downshift speed threshold of all gears in the transmission under different operating conditions;

[0082] S2. When braking is required while the vehicle is in motion, and the engine speed is below idle speed, determine the target gear based on the shift parameters and the engine's optimal economic speed range, and perform the shifting operation according to the target gear; the specific steps of step S2 are as follows:

[0083] S21. Determine whether the transmission control unit has received a braking signal;

[0084] If so, proceed to step S23;

[0085] If not, proceed to step S22;

[0086] S22. Control the vehicle to continue at the original speed and return to step S21;

[0087] S23. When the engine speed is lower than the idle speed and the vehicle is not in a starting state, calculate the engine speed values ​​corresponding to the current gear of the transmission; such as Figure 3 As shown, the specific steps of step S23 are as follows:

[0088] S231. Determine the engine idle speed value and check whether the current engine speed is less than the idle speed value;

[0089] If so, proceed to step S232;

[0090] If not, proceed to step S22;

[0091] S232. Determine whether the current gear of the transmission is greater than or equal to the starting gear;

[0092] If so, proceed to step S233;

[0093] If not, engage first gear in the transmission to end;

[0094] S233. Control the clutch to disengage, and calculate the engine speed value for each gear based on the vehicle's matched engine idle speed, the gear ratios of each gear in the transmission, and the current engine speed; the calculation formula for the engine speed value for each gear is as follows:

[0095]

[0096] in, Here, k is the engine speed in one of the other gears, ik is the gear ratio of gear k, ist is the gear ratio of the current gear, and Vst is the current engine speed.

[0097] S24. Filter out the economical gear speed values ​​that satisfy the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economical gear speed value, and use the highest gear as the target gear; for example... Figure 4 As shown, the specific steps of step S24 are as follows:

[0098] S241. Sequentially locate the calculated speed values ​​for each gear;

[0099] S242. Determine whether the gear position speed value matches the engine's optimal economic speed range;

[0100] If so, use the positioning speed value as the economic speed value and proceed to step S243;

[0101] If not, discard the gear speed value and proceed to step S243;

[0102] S243. Determine whether the speed values ​​for each gear have been set;

[0103] If so, proceed to step S244;

[0104] If not, locate the speed value for the next gear and return to step S242;

[0105] S244. Determine if an economic speed value exists;

[0106] If so, proceed to step S246;

[0107] If not, proceed to step S245;

[0108] S245. Determining that no target gear exists, control the transmission to engage first gear, and end;

[0109] S246. Determine the gear corresponding to each economic speed value, sort the gears, and use the highest gear as the target gear;

[0110] S25. The transmission controller uses the target gear to perform the shifting operation.

[0111] Example 3:

[0112] like Figure 5 As shown, the present invention provides a commercial vehicle AMT braking shift skipping and downshifting control device, comprising:

[0113] The shift parameter determination module is used to pre-determine shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve. The shift parameter determination module includes:

[0114] The shift parameter determination unit is used to pre-determine the shift parameters based on the universal characteristic curve of the engine; the shift parameters include the braking downshift speed threshold of all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio.

[0115] The engine optimal economic speed range determination unit is used to determine the engine's optimal economic speed range based on the braking downshift speed threshold of all gears in the transmission under different operating conditions.

[0116] The brake shift control module is used to determine the target gear based on shift parameters and the engine's optimal economic speed range when braking is required during vehicle operation and the engine speed is below idle speed, and then performs the shift operation according to the target gear. The brake shift control module includes:

[0117] The brake signal determination unit is used to determine whether the transmission control unit has received a brake signal;

[0118] The vehicle speed maintenance control unit is used to control the vehicle to travel at the original speed when no braking signal is received;

[0119] The gearbox speed calculation unit is used to receive the braking signal and calculate the speed value of each gear corresponding to the current gear when the engine speed is lower than the idle speed and the vehicle is not in a starting state.

[0120] The target gear calculation unit is used to filter out the economic gear speed values ​​that meet the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economic gear speed value, and use the maximum gear as the target gear.

[0121] The shift control unit is used to enable the transmission controller to perform shifting operations using the target gear.

[0122] Example 4:

[0123] This invention provides a computer device, including a processor and a memory;

[0124] The memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that the computer device performs the method described in Embodiment 1 or Embodiment 2 above.

[0125] Example 5:

[0126] This invention provides a storage medium,

[0127] The storage medium stores instructions that, when run on a computer, cause the computer to execute the method described in Embodiment 1 or Embodiment 2 above.

[0128] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A method for controlling brake shifting and downshifting in a commercial vehicle AMT, characterized in that, Includes the following steps: S1. Pre-determine the shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve; S2. When braking is required while the vehicle is in motion and the engine speed is lower than the idle speed, determine the target gear based on the shift parameters and the engine's optimal economic speed range, and perform the shift operation according to the target gear. The specific steps of step S2 are as follows: S21. Determine whether the transmission control unit has received a braking signal; If so, proceed to step S23; If not, proceed to step S22; S22. Control the vehicle to continue at the original speed and return to step S21; S23. When the engine speed is lower than the idle speed and the vehicle is not in a starting state, calculate the speed values ​​of each gear corresponding to the current gear of the transmission; S24. Filter out the economic gear speed values ​​that meet the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economic gear speed value, and take the maximum gear as the target gear; S25. The transmission controller uses the target gear to perform a shift operation; The specific steps of step S23 are as follows: S231. Determine the engine idle speed value and check whether the current engine speed is less than the idle speed value; If so, proceed to step S232; If not, proceed to step S22; S232. Determine whether the current gear of the transmission is greater than or equal to the starting gear; If so, proceed to step S233; If not, engage the transmission in first gear to end; S233. Control the clutch to disengage, and calculate the speed value of each gear based on the vehicle's matched engine idle speed value, the gear ratio of each gear in the transmission, and the current engine speed value; The formulas for calculating the engine speed in each gear are as follows: in, Vst is the engine speed in one of the other gears, k is the other gear, ik is the gear ratio of gear k, ist is the gear ratio of the current gear, and Vst is the current engine speed.

2. The commercial vehicle AMT braking shifting and downshifting control method as described in claim 1, characterized in that, The specific steps of step S1 are as follows: S11. Pre-determine the shift parameters based on the engine universal characteristic curve; the shift parameters include the braking downshift speed thresholds for all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio. S12. Determine the optimal economic speed range of the engine based on the braking downshift speed thresholds of all gears in the transmission under different operating conditions.

3. The commercial vehicle AMT braking shifting and downshifting control method as described in claim 1, characterized in that, The specific steps of step S24 are as follows: S241. Sequentially locate the calculated speed values ​​for each gear; S242. Determine whether the gear position speed value matches the engine's optimal economic speed range; If so, use the positioning speed value as the economic speed value and proceed to step S243; If not, discard the gear speed value and proceed to step S243; S243. Determine whether the speed values ​​for each gear have been set; If so, proceed to step S244; If not, locate the speed value for the next gear and return to step S242; S244. Determine if an economic speed value exists; If so, proceed to step S246; If not, proceed to step S245; S245. Determining that no target gear exists, control the transmission to engage first gear, and end; S246. Determine the gear corresponding to each economic speed value, sort the gears, and use the highest gear as the target gear.

4. A commercial vehicle AMT braking shift skipping and downshifting control device, applicable to the commercial vehicle AMT braking shift skipping and downshifting control method according to any one of claims 1-3, characterized in that, include: The shift parameter determination module is used to pre-determine the shift parameters and the engine's optimal economic speed range based on the engine's universal characteristic curve. The brake shift control module is used to determine the target gear based on shift parameters and the engine's optimal economic speed range when braking is required during vehicle operation and the engine speed is below idle speed, and then perform the shift operation according to the target gear.

5. The commercial vehicle AMT brake shifting and downshifting control device as described in claim 4, characterized in that, The shift parameter determination module includes: The shift parameter determination unit is used to pre-determine the shift parameters based on the universal characteristic curve of the engine; the shift parameters include the braking downshift speed threshold of all gears of the transmission under different operating conditions, the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission; the vehicle-matched engine idle speed value and the speed ratio of each gear of the transmission are denoted as the speed ratio. The engine optimal economic speed range determination unit is used to determine the engine's optimal economic speed range based on the braking downshift speed threshold of all gears in the transmission under different operating conditions. The brake shift control module includes: The brake signal determination unit is used to determine whether the transmission control unit has received a brake signal; The vehicle speed maintenance control unit is used to control the vehicle to travel at the original speed when no braking signal is received; The gearbox speed calculation unit is used to receive the braking signal and calculate the speed value of each gear corresponding to the current gear when the engine speed is lower than the idle speed and the vehicle is not in a starting state. The target gear calculation unit is used to filter out the economic gear speed values ​​that meet the engine's optimal economic speed range from the speed values ​​of each gear, determine the gear corresponding to each economic gear speed value, and use the maximum gear as the target gear. The shift control unit is used to enable the transmission controller to perform shifting operations using the target gear.

6. A computer device, characterized in that, Including processor and memory; The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device performs the method described in any one of claims 1-3.

7. A storage medium, characterized in that, The storage medium stores instructions that, when run on a computer, cause the computer to perform the method described in any one of claims 1-3.

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