Gear shift control method, device, equipment and medium

Abstract

Embodiments of the present disclosure relate to a gear shifting control method, device, equipment and medium. The method comprises: in the case that the exhaust brake unit of a target vehicle is in an activated state, judging whether the associated working condition information of the target vehicle meets the gear shifting control condition; wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit; if the associated working condition information meets the gear shifting control condition, determining the clutch pressure value of the target vehicle according to the engine speed of the target vehicle; and performing gear shifting control on the target vehicle according to the clutch pressure value. In the above scheme, in the case that the exhaust brake unit actually functions, the fine control of the clutch pressure value based on the engine speed is realized, so that the clutch control is more accurate during gear shifting, gear shifting impact is avoided, the reliability of the hydraulic automatic transmission is improved, the power output is more stable, and the gear shifting experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, and particularly relates to a gear shifting control method and device, equipment and medium. BACKGROUND

[0002] In order to reduce the risk of brake failure caused by long-time braking in high load and long downhill, some vehicles increase the exhaust brake function of the engine to assist the vehicle braking and improve the braking safety of the vehicle.

[0003] In related technologies, when the exhaust brake is used, the torque sent by the engine to the torque converter is a negative maximum torque, which will cause the clutch control pressure calculated by the torque converter based on the torque to be too large, resulting in gear shifting impact, damage to the hardware of the torque converter, and poor gear shifting experience of the user. SUMMARY

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a gear shifting control method, device, equipment and medium.

[0005] The present disclosure provides a gear shifting control method, which comprises the following steps:

[0006] In the case that the exhaust brake unit of the target vehicle is in an activated state, it is judged whether the associated working condition information of the target vehicle meets a gear shifting control condition; wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit;

[0007] If the associated working condition information meets the gear shifting control condition, the clutch pressure value of the target vehicle is determined according to the engine speed of the target vehicle;

[0008] The target vehicle is controlled to shift gears according to the clutch pressure value.

[0009] The present disclosure also provides a gear shifting control device, which comprises:

[0010] A judging module is configured to, in the case that the exhaust brake unit of the target vehicle is in an activated state, judge whether the associated working condition information of the target vehicle meets a gear shifting control condition; wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit;

[0011] A first determining module is configured to, if the associated working condition information meets the gear shifting control condition, determine the clutch pressure value of the target vehicle according to the engine speed of the target vehicle;

[0012] A shift module is configured to perform shift control on the target vehicle according to the clutch pressure value.

[0013] The electronic device includes a processor, a memory for storing executable instructions of the processor, and the processor is configured to read the executable instructions from the memory and execute the instructions to implement the shift control method provided by the embodiments of the present disclosure.

[0014] The embodiments of the present disclosure also provide a computer-readable storage medium storing a computer program, and the computer program is used to execute the shift control method provided by the embodiments of the present disclosure.

[0015] The technical solution provided by the embodiments of the present disclosure has the following advantages compared with the prior art: the shift control method provided by the embodiments of the present disclosure includes: in the case that the exhaust brake unit of the target vehicle is in an activated state, determining whether the associated working condition information of the target vehicle meets the shift control condition; wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit; if the associated working condition information meets the shift control condition, determining the clutch pressure value of the target vehicle according to the engine speed of the target vehicle; and performing shift control on the target vehicle according to the clutch pressure value. By using the above technical solution, when the exhaust brake unit of the vehicle is in an activated state and the working condition information related to the vehicle and the exhaust brake unit meets the condition for performing shift control, the clutch pressure value is determined according to the engine speed, and shift control is performed on the vehicle according to the clutch pressure value. According to the state setting of the exhaust brake unit and the actual working condition related to the vehicle and the exhaust brake, it is determined whether the exhaust brake actually acts, and in the case of actual action, the clutch pressure value based on the engine speed is finely controlled, so that the clutch control is more accurate during shifting, the shift impact is avoided, the reliability of the hydraulic automatic transmission is improved, the power output is more stable, and the user's shift experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure together with the specification.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0018] Figure 1 A flowchart of a shift control method provided by the embodiments of the present disclosure is shown in the figure.

[0019] Figure 2 FIG. 1 is a flowchart of another shift control method provided in an embodiment of the present disclosure;

[0020] Figure 3 FIG. 1 is a flowchart of another shift control method provided in an embodiment of the present disclosure;

[0021] Figure 4 FIG. 1 is a flowchart of another shift control method provided in an embodiment of the present disclosure;

[0022] Figure 5 FIG. 1 is a flowchart of another shift control method provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0024] With the increasing maturity of automatic transmission technology, the proportion of vehicles equipped with automatic transmission in the market is gradually increasing, and the use rate of automatic transmission vehicles in daily use is also higher. With the increasing demand of users for comfort, the quality and reliability of automatic transmission shift are increasingly required.

[0025] In related technologies, in order to improve safety and reduce the risk of brake failure caused by long-time braking in the case of high load and long downhill, some vehicles are equipped with engine exhaust brake function, which can assist vehicle braking and improve vehicle braking safety. However, the torque accuracy of the diesel engine of the vehicle in related technologies is poor, and the torque of the engine to the torque converter is the negative maximum torque when the engine is reversed when the exhaust brake is used. However, this negative maximum torque is not the actual output torque of the engine, which further leads to the clutch control pressure calculated by the torque converter based on the torque being too large, resulting in shift impact, damage to the hardware of the torque converter, and poor shift experience of the user. It can be seen that in related technologies, the control strategy for automatic transmission vehicles has the problem of inaccurate engine torque transmission and poor torque accuracy during exhaust braking.

[0026] To solve the above problems, the present disclosure provides a shift control method, which will be introduced below in combination with specific embodiments.

[0027] Figure 1A flowchart of a shift control method is provided in the embodiments of the present disclosure, and the shift control method can be applied to a shift control device. The shift control device can be implemented by software and / or hardware, and can be integrated in an electronic device, which can be a transmission control unit (TCU). As shown in FIG. 1, the shift control method includes the following steps. Figure 1

[0028] In step 101, in a case where an exhaust brake unit of a target vehicle is in an activated state, it is determined whether associated working condition information of the target vehicle satisfies a shift control condition; wherein the associated working condition information is working condition information associated with the exhaust brake unit.

[0029] The target vehicle can be a vehicle equipped with a transmission control unit adopting the shift control method. The target vehicle can be a diesel engine automatic transmission vehicle, and the embodiments of the present disclosure do not limit the use of the target vehicle, for example, the target vehicle can be a commercial vehicle. The exhaust brake unit can be a unit for realizing an exhaust brake function in the target vehicle, which is also known as cylinder braking or reverse drag. The exhaust brake function can adjust the pressure of the exhaust passage of the engine to increase the exhaust stroke, and then obtain the braking force by using the generated negative pressure. The activated state can represent that the corresponding function has been turned on, but it does not represent that the function has actually acted. The actual action can be understood as generating the corresponding braking force by the exhaust brake function. The associated working condition information can be working condition information associated with the action of the exhaust brake function, and the associated working condition information can be used to determine whether the exhaust brake function actually acts. The shift control condition can be a condition for determining whether to perform shift control based on the engine speed, and the shift control condition can be used to represent that the exhaust brake function of the target vehicle has acted based on the associated working condition information.

[0030] In the embodiments of the present disclosure, during the driving process of the target vehicle, the user can set the exhaust brake unit to the activated state through the exhaust brake switch according to the user's own needs. The shift control device can detect the state identifier of the exhaust brake unit in real time, and if the state identifier is in the activated state, the associated working condition information of the target vehicle is obtained, and it is determined whether the associated working condition information satisfies the shift control condition.

[0031] In step 102, if the associated working condition information satisfies the shift control condition, the clutch pressure value of the target vehicle is determined according to the engine speed of the target vehicle.

[0032] ​The engine speed can be the number of revolutions of the engine crankshaft per unit time. The clutch pressure value, also referred to as the clutch control pressure value, can be the pressure value acting on the clutch plate in the clutch. The type of clutch is not limited in the embodiment.

[0033] In the embodiments of the present disclosure, if the shift control device determines that the associated working condition information meets the shift control condition, it means that the exhaust brake unit of the target vehicle is in an activated state, and the exhaust brake unit has actually acted. The shift control needs to be performed during the subsequent exhaust brake period. The shift control device can obtain the engine speed of the target vehicle, and directly determine the clutch pressure value according to the engine speed and the relationship between the pre-labeled speed and pressure value. Alternatively, the torque is determined according to the engine speed, and the clutch pressure value is indirectly determined based on the torque and the relationship between the pre-labeled torque and pressure value.

[0034] In some embodiments of the present disclosure, the associated working condition information includes user operation information and vehicle running information, and the shift control condition includes a first shift control condition in the user operation dimension and a second shift control condition in the vehicle running dimension.

[0035] The user operation information can be working condition information adjusted by user operation. The vehicle running information can be working condition information representing the running condition of the vehicle, which cannot be directly adjusted by user operation. The first shift control condition can be a condition for determining whether to perform shift control based on the engine speed in the user operation dimension. The first shift control condition can correspond to the user operation information one-to-one. The second shift control condition can be a condition for determining whether to perform shift control based on the engine speed in the vehicle running dimension. The second shift control condition can correspond to the vehicle running information one-to-one.

[0036] In some embodiments of the present disclosure, the associated working condition information meets the shift control condition, including: the user operation information meets the first shift control condition, and the vehicle running information meets the second shift control.

[0037] In the embodiment, the gear shift control device can acquire the first user operation information, and determine whether the first user operation information satisfies the first gear shift control condition. If yes, it means that the target vehicle in the user operation dimension matches the user operation condition when the exhaust brake unit actually acts. The gear shift control device can acquire the second user operation information, and determine whether the second user operation information satisfies the second gear shift control condition. If yes, it means that the target vehicle in the vehicle operation dimension matches the vehicle operation condition when the exhaust brake unit actually acts. In the case where both the first gear shift control condition and the second gear shift control condition are satisfied, the gear shift control device can send an instruction to activate the subsequent gear shift control function through the instruction.

[0038] In the above scheme, whether the exhaust brake function of the target vehicle actually acts is determined from two dimensions of user operation and vehicle operation, and subsequent gear shift control is performed in the case of actual action, so that the timing of gear shift control is more adapted to the current situation of the vehicle.

[0039] In some embodiments of the present disclosure, the user operation information includes the accelerator pedal opening degree and / or the driving mode, and the user operation information satisfying the first gear shift control condition includes: the accelerator pedal opening degree being not greater than a preset opening threshold; and / or, the driving mode not belonging to a preset terrain mode; wherein the preset terrain mode includes at least one of a multi-drive mode, a sand mode, and an off-road mode.

[0040] The accelerator pedal opening degree can be used to represent the degree to which the user currently steps on the accelerator pedal. The preset opening threshold can be a threshold value preset for judging whether the user does not step on the accelerator or steps on the accelerator with a small degree, which can be set according to the accelerator sensitivity of the target vehicle, etc. The lower the accelerator sensitivity, the higher the preset opening value can be, so that the subsequent processing steps can be continued in the case where the engine does not respond obviously but the accelerator pedal opening degree is not 0. For example, the preset opening threshold can be 0 or 5.

[0041] The driving mode can be a mode for adjusting the vehicle for a specific road condition or a specific driving demand, and the driving model can include a gear shift mode corresponding to the specific road condition or the specific driving demand. The preset terrain mode can be a driving mode set for a terrain without a long downhill. The multi-drive mode can be a mode for distributing engine power to two or more wheels, which can include a four-wheel drive mode, etc. The multi-drive mode is often used in terrains where uphill and downhill are continuously exchanged. The sand mode can be a driving mode set for a sand terrain. The off-road mode can be a driving mode set for an off-road terrain.

[0042] Optionally, the user operation information includes an accelerator pedal opening degree, and the user operation information satisfying the first shift control condition includes that the accelerator pedal opening degree is not greater than a preset opening degree threshold. Alternatively, the user operation information includes a driving mode, and the user operation information satisfying the first shift control condition includes that the driving mode does not belong to a preset terrain mode. Alternatively, the user operation information includes an accelerator pedal opening degree and a driving mode, and the user operation information satisfying the first shift control condition includes that the accelerator pedal opening degree is not greater than a preset opening degree threshold, and the driving mode does not belong to a preset terrain mode.

[0043] In the embodiment, the engine control system sends the accelerator pedal opening degree to the shift control device, and the shift control device determines whether the accelerator pedal opening degree is not greater than a preset opening degree threshold after receiving the accelerator pedal opening degree. If yes, it indicates that the driver does not trigger the throttle opening or the power system response, and the target vehicle satisfies the shift control condition in the accelerator pedal opening degree dimension. Generally, the driver does not need to brake or perform exhaust brake when triggering the vehicle power system response. The above determination process determines whether the target vehicle will actually open the exhaust brake function in the accelerator pedal opening degree dimension.

[0044] In the embodiment, the shift control system can obtain a mode signal representing the driving mode in which the target vehicle is currently located, analyze the mode signal, and determine that the driving mode is a normal mode or a self-defined long downhill mode, i.e., the driving mode does not belong to a preset terrain mode, which indicates that the target vehicle is not currently located in a terrain such as off-road or sand where there is no continuous downhill section, and the target vehicle can be continuously downhill, and the target vehicle satisfies the shift control condition in the driving mode dimension. Since there is no long downhill in continuous uphill and downhill, sand, off-road, and other terrains, exhaust brake is not needed. The above determination in the driving mode dimension determines whether the target vehicle will actually open the exhaust brake function.

[0045] In some embodiments of the present disclosure, the vehicle operation information includes a target gear value and / or an engine speed, and the vehicle operation information satisfying the second shift control includes that the target gear value is not less than a preset gear value, and / or that the exhaust brake torque determined according to the engine speed is not greater than a preset torque threshold.

[0046] The target gear value represents the gear currently suitable for the target vehicle. This target gear value can be used to indicate the current gear the target vehicle is in, or the gear to which it needs to shift. The preset gear value can be the minimum gear value under the actual operation of the exhaust braking function. This embodiment does not limit this preset gear value; for example, the preset gear value can be 2nd gear. The exhaust braking torque can be understood as the actual torque output by the engine. The preset torque threshold can be used to determine whether the exhaust braking function is effective on the actual torque output by the engine. This embodiment does not limit this preset torque threshold; for example, the preset torque threshold can be 0 or a smaller value that is close to 0.

[0047] Optionally, the vehicle operating information includes a target gear value, and the vehicle operating information satisfies the second shift control, including: the target gear value is not less than a preset gear value. Alternatively, the vehicle operating information includes engine speed, and the vehicle operating information satisfies the second shift control, including: the exhaust braking torque determined based on the engine speed is not greater than a preset torque threshold. Alternatively, the vehicle operating information includes both a target gear value and engine speed, and the vehicle operating information satisfies the second shift control, including: the target gear value is not less than a preset gear value, and the exhaust braking torque determined based on the engine speed is not greater than a preset torque threshold.

[0048] In this embodiment, the automatic transmission control system sends a target gear value to the shift control device. This automatic transmission control system can be a hydraulic automatic transmission control system. The shift control device receives the target gear value and determines whether it is within a preset gear index. If so, it indicates that the target gear value is not less than the preset gear value, and the target vehicle meets the shift control conditions in the gear dimension. The preset gear index can be a list of gear values ​​that are not less than the preset gear value among the vehicle's available gear values. Since the speed ratio is higher in lower gears, the likelihood of the exhaust braking function actually being used is lower. The target gear value determines whether the target vehicle's gear matches the exhaust braking function.

[0049] In this implementation, the engine can send its exhaust braking torque to the shift control device. The shift control device receives the exhaust braking torque and determines whether it is less than or equal to a preset torque threshold. If so, the exhaust braking function is considered to be actually in effect. Thus, the effectiveness of the exhaust braking function is determined by whether it actually affects the torque output by the engine.

[0050] Figure 2 This is a flowchart illustrating another shift control method provided in this embodiment of the present disclosure, as shown below. Figure 2 As shown, the clutch pressure value of the target vehicle is determined based on the engine speed of the target vehicle, including:

[0051] At step 201, the input torque is determined based on the exhaust brake torque; wherein the exhaust brake torque is determined according to the engine speed.

[0052] The input torque can be a torque for the input pressure calculation unit to determine the clutch pressure value, and the input torque can be understood as a direct basis for determining the clutch pressure value.

[0053] In the embodiment, the shift control device can determine the exhaust brake torque as the input torque. Alternatively, the shift control device can gradually reach the exhaust brake torque with the maximum negative torque as the starting value of the input torque.

[0054] In some embodiments of the present disclosure, determining the input torque based on the exhaust brake torque includes: determining a calculation torque corresponding to the current time according to the current time, a torque change function; wherein the torque change function is determined according to an initial time when the shift control condition is met, a maximum negative torque, and a pre-set function parameter value; if the calculation torque is not greater than the exhaust brake torque, the calculation torque is determined as the input torque; if the calculation torque is greater than the exhaust brake torque, the exhaust brake torque is determined as the input torque.

[0055] The initial time can be the time when the shift control condition is determined to be met. The torque change function can be used to determine the torque value in the process of gradually changing the torque from the maximum negative torque to the exhaust brake torque. The maximum negative torque can be the maximum torque of the engine output of the target vehicle in the negative direction, and the negative direction can be the torque direction when the target vehicle is braked. The maximum negative torque can be understood as the minimum torque of the target vehicle. The function parameter value can be a specific value pre-set for the parameters in the function, and the present embodiment does not limit the function parameter value. Taking the torque change function as a linear function as an example, the function parameter value can be the slope. The calculation torque can be an intermediate torque in the process of gradually changing the torque from the maximum negative torque to the exhaust brake torque value.

[0056] In the embodiment, the initial moment when the shift control condition is satisfied is determined, in order to avoid the torque from the negative maximum torque to the exhaust brake torque, the shift control device can determine the torque corresponding to the initial moment in the torque change function as the negative maximum torque, and determine the calculated torque corresponding to the current moment in the torque change function according to the function parameter value and the initial moment, the negative maximum torque. Determine the calculated torque corresponding to the current moment in the torque change function. Determine whether the calculated torque is greater than the exhaust brake torque. If the calculated torque is less than or equal to the exhaust brake torque, it means that the calculated torque is greater than or equal to the exhaust brake torque in the case of the same negative direction of the torque, and the current is still in the gradual change stage of the torque, so the calculated torque is determined as the input torque. If the calculated torque is greater than the exhaust brake torque, it means that the calculated torque is less than the exhaust brake torque in the case of the same negative direction of the torque, and the current is in the stage where the gradual change of the torque has been completed, so the exhaust brake torque is determined as the input torque.

[0057] In the above scheme, the input torque is gradually changed from the negative maximum torque to the exhaust brake torque, and the gradual change of the clutch pressure determined subsequently is realized by the gradual change of the input torque, the smooth control of the clutch pressure is realized, and the smoothness of the shift is further improved.

[0058] Step 202, input the input torque into the pressure calculation unit of the target vehicle, so that the pressure calculation unit determines the clutch pressure value according to the input torque.

[0059] Among them, the pressure calculation unit can be a functional unit for determining the clutch pressure according to the torque. The pressure calculation unit can be an existing unit in the vehicle.

[0060] In the embodiment, the shift control device can input the input torque into the pressure calculation unit of the target vehicle, and the pressure calculation unit receives the input torque and calculates the clutch pressure value according to the input torque.

[0061] In the above scheme, the clutch pressure value is determined based on the engine speed and the torque as an intermediate quantity, so that the shift control method can be realized by means of the existing pressure calculation unit for calculating the clutch pressure value according to the torque, the adaptability of the shift control method to the existing vehicle is improved, and the cost of applying the shift control method is reduced.

[0062] Step 103, shift control the target vehicle according to the clutch pressure value.

[0063] In the embodiment of the present disclosure, during the shift process, the shift control device can apply pressure to the clutch plate according to the clutch pressure value, thereby realizing the shift control of the target vehicle.

[0064] The shift control method provided by the embodiments of the present disclosure comprises: in the case that the exhaust brake unit of the target vehicle is in an activated state, judging whether the associated working condition information of the target vehicle satisfies a shift control condition; wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit; if the associated working condition information satisfies the shift control condition, determining a clutch pressure value of the target vehicle according to the engine speed of the target vehicle; and performing shift control on the target vehicle according to the clutch pressure value. By using the above technical solution, in the case that the exhaust brake unit of the vehicle is in an activated state and the working condition information related to the vehicle and the exhaust brake unit satisfies the condition for performing shift control, the clutch pressure value is determined according to the engine speed, and the vehicle is controlled according to the clutch pressure value, the actual effect of the exhaust brake is determined according to the state setting of the exhaust brake unit and the actual working condition related to the vehicle and the exhaust brake, and in the case of actual effect, the fine control of the clutch pressure value based on the engine speed is realized, so that the clutch control is more accurate during shifting, the shift impact is avoided, the reliability of the hydraulic automatic transmission is improved, the power output is more stable, and the user's shift experience is improved.

[0065] In some embodiments of the present disclosure, the shift control method further comprises: determining the exhaust brake torque according to the engine speed and a pre-labeled speed-torque model; wherein the speed-torque model is determined by adjusting a pedal characteristic model corresponding to the target vehicle according to the torque feedback information of the driver.

[0066] The speed-torque model can be a mathematical model representing the relationship between the engine speed and the exhaust brake torque. The torque feedback information can be used to represent the driver's sensory feedback of the torque at a specific engine speed. The torque feedback information can include information representing that the sensed torque is larger than the torque determined based on the pedal characteristic model, information representing that the sensed torque is smaller than the torque determined based on the pedal characteristic model, information representing that the sensed torque is consistent with the torque determined based on the pedal characteristic model, and the like. The pedal characteristic model can be a mathematical model representing the relationship between the engine speed and the exhaust brake torque, which is determined based on a pedal map.

[0067] In the present embodiment, a pedal map is pre-labeled for the target vehicle, and based on the pedal map, a pedal characteristic model representing the relationship between the engine speed of the target vehicle and the exhaust brake torque can be determined. In order to further improve the accuracy of the exhaust brake torque determined by the model, in the present embodiment, the subjective feedback of the driver on the torque at a specific engine speed during the driving of the vehicle can be collected to generate torque feedback information. The speed-torque model is fitted and adjusted according to the torque feedback information. After the engine speed is determined, the shift control device can substitute the engine speed into the speed-torque model to obtain the exhaust brake torque corresponding to the engine speed.

[0068] In the above scheme, the existing pedal characteristic model is adjusted to obtain a speed torque model, so that the relationship between the target vehicle engine speed and the exhaust brake torque is more accurate, and the exhaust brake torque determined based on the speed torque model is also more accurate, thereby creating a foundation for smooth shift control.

[0069] Next, the shift control method in the embodiment of the present disclosure will be further described through a specific example. In the embodiment, in the normal driving of the vehicle, the switch of the exhaust brake function is opened, the throttle is released for coasting, or the brake is pressed after the throttle is released, the shift clutch pressure control is performed based on the exhaust brake torque, thereby improving the shift comfort and reliability, and the method specifically includes the following steps: first, the vehicle state is detected, if the switch of the exhaust brake function is opened in the driving of the vehicle, it is judged whether the throttle opening degree is not greater than a preset opening threshold; if yes, it is judged whether the target gear value belongs to a preset gear index; if yes, it is judged whether the driving mode belongs to a preset terrain mode; if yes, it is determined whether the exhaust brake torque is not greater than a preset torque threshold; if yes, the clutch control function is opened, the torque starting from the function activation time reaches the calculated exhaust brake torque according to a certain slope, and the shift clutch pressure control is performed based on the preset exhaust brake torque.

[0070] Figure 3 A schematic diagram of the shift control method provided in the embodiment of the present disclosure is shown in Figure 3As shown, the target vehicle can be a commercial automatic vehicle. When the target vehicle is in the process of driving, the exhaust brake unit is activated by the exhaust brake switch. The hydraulic automatic transmission control system receives the throttle pedal opening degree sent by the engine control system. If the throttle pedal opening degree is less than or equal to the preset opening degree threshold, the subsequent target gear value is judged. If the throttle pedal opening degree is greater than the preset opening degree threshold, the throttle pedal opening degree is continuously monitored. If the target gear value sent by the hydraulic automatic transmission control system is on the preset gear index, the subsequent driving mode is judged. If the target gear value is not on the preset gear index, the target gear value is continuously monitored. If the driving mode sent by the hydraulic automatic transmission control system does not belong to the preset terrain mode, the subsequent exhaust brake torque is judged. If the driving mode belongs to the preset terrain mode, the driving mode is continuously monitored. If the exhaust brake torque sent by the engine is greater than the preset torque threshold, the exhaust brake torque is continuously monitored. If the exhaust brake torque sent by the engine is not greater than the preset torque threshold, it means that the shift control conditions of the above different dimensions are all met, and the hydraulic automatic transmission control system sends a command to activate the exhaust brake shift clutch control. The torque used by the shift clutch needs to be determined based on the torque constant of the engine corresponding to the exhaust brake torque at different engine speeds. From the time when the exhaust brake switch is activated, the hydraulic automatic transmission control system receives the demand torque value sent by the engine. The demand torque value can be a negative maximum torque. The calculated torque of the input pressure calculation unit changes from the negative maximum torque to the corresponding exhaust brake torque according to the preset slope. The shift clutch controls the pressure of the clutch based on the input torque, so that the clutch control pressure is accurate and stable, and the shift is smooth.

[0071] The shift control method provided by the embodiments of the present disclosure is used for the exhaust brake unit of the target vehicle. When the exhaust brake torque, the throttle pedal opening degree, the target gear value and the driving mode all meet the corresponding conditions, the shift clutch controls the pressure of the shift clutch based on the exhaust brake torque. By adding the corresponding judgment strategy in the software of the automatic transmission control unit, the exhaust brake torque is determined according to the engine speed, and then the clutch pressure control is performed. The negative maximum torque sent by the engine is no longer used, so that the clutch control is more accurate and smooth during the shift, the power output is more stable, the shift is more comfortable, and the reliability of the hydraulic automatic transmission is ensured.

[0072] Figure 4 A structural schematic diagram of a shift control device provided by the embodiments of the present disclosure is shown in the figure. The device can be realized by software and / or hardware. The device can also be integrated in an electronic device. Figure 4 As shown, the shift control device comprises:

[0073] The judging module 401 is configured to judge whether associated working condition information of the target vehicle meets a shift control condition in a case where an exhaust brake unit of the target vehicle is in an activated state, wherein the associated working condition information is working condition information having an associated relationship with the exhaust brake unit.

[0074] The first determining module 402 is configured to determine a clutch pressure value of the target vehicle according to an engine speed of the target vehicle if the associated working condition information meets the shift control condition.

[0075] The shift module 403 is configured to perform shift control on the target vehicle according to the clutch pressure value.

[0076] Optionally, the associated working condition information comprises user operation information and vehicle running information, and the shift control condition comprises a first shift control condition in a user operation dimension and a second shift control condition in a vehicle running dimension.

[0077] The associated working condition information meets the shift control condition, comprising:

[0078] The user operation information meets the first shift control condition, and the vehicle running information meets the second shift control.

[0079] Optionally, the user operation information comprises an accelerator pedal opening degree and / or a driving mode, and the user operation information meets the first shift control condition, comprising:

[0080] The accelerator pedal opening degree is not greater than a preset opening degree threshold, and / or the driving mode does not belong to a preset terrain mode, wherein the preset terrain mode comprises at least one of a multi-drive mode, a sand mode and an off-road mode.

[0081] Optionally, the vehicle running information comprises a target gear value and / or the engine speed, and the vehicle running information meets the second shift control, comprising:

[0082] The target gear value is not less than a preset gear value, and / or an exhaust brake torque determined according to the engine speed is not greater than a preset torque threshold.

[0083] Optionally, the determination of the clutch pressure value of the target vehicle according to the engine speed of the target vehicle comprises:

[0084] determining an input torque based on an exhaust brake torque, wherein the exhaust brake torque is determined according to the engine speed;

[0085] inputting the input torque to a pressure calculation unit of the target vehicle, so that the pressure calculation unit determines the clutch pressure value according to the input torque.

[0086] Optionally, the determining the input torque based on the exhaust brake torque comprises:

[0087] determining the calculated torque corresponding to the current time according to the current time and a torque change function, wherein the torque change function is determined according to an initial time when the shift control condition is met, a negative maximum torque and a pre-set function parameter value;

[0088] if the calculated torque is not greater than the exhaust brake torque, determining the calculated torque as the input torque;

[0089] if the calculated torque is greater than the exhaust brake torque, determining the exhaust brake torque as the input torque.

[0090] Optionally, the shift control device further comprises:

[0091] a second determining module configured to determine the exhaust brake torque according to the engine speed and a pre-calibrated speed-torque model, wherein the speed-torque model is determined by adjusting a pedal characteristic model corresponding to the target vehicle according to torque feedback information of a driver.

[0092] It should be noted that, Figure 4 The shift control device shown can perform each step in the shift control method embodiment described above, and achieve each process and effect in the shift control method embodiment described above, and thus will not be described here.

[0093] Figure 5 A structural schematic diagram of an electronic device is provided for the embodiments of the present disclosure. As shown in Figure 5 The electronic device 500 includes one or more processors 501 and a memory 502.

[0094] The processor 501 can be a central processing unit (CPU) or other forms of processing units with shift control capabilities and / or instruction execution capabilities, and can control other components in the electronic device 500 to perform desired functions.

[0095] The memory 502 can include one or more computer program products that can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory, for example, can include random access memory (RAM), cache memory, and / or the like. The non-volatile memory, for example, can include read only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer-readable storage media, and the processor 501 can run the program instructions to implement the shift control method of the embodiments of the present disclosure described above and / or other desired functions. Various contents such as input signals, signal components, noise components, and the like can also be stored in the computer-readable storage media.

[0096] In one example, the electronic device 500 can further include an input device 503 and an output device 504, which are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0097] In addition, the input device 503 can further include, for example, a keyboard, a mouse, and the like.

[0098] The output device 504 can output various information to the outside, including the determined distance information, direction information, and the like. The output device 504 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0099] Of course, in order to simplify, Figure 5 In the above description, only some of the components in the electronic device 500 related to the present disclosure are shown, and components such as buses, input / output interfaces, and the like are omitted. In addition, the electronic device 500 can further include any other appropriate components according to specific application cases.

[0100] In addition to the above method and device, the embodiments of the present disclosure can also be a computer program product including computer program instructions, which, when executed by a processor, cause the processor to perform the shift control method provided by the embodiments of the present disclosure.

[0101] The computer program product can be written in any combination of one or more programming languages, including an object-oriented programming language such as Java, C++, and the like, and conventional procedural programming languages, such as the "C" programming language, or the like. The program code can be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0102] In addition, an embodiment of the present disclosure can also be a computer readable storage medium, having stored thereon computer program instructions, which, when executed by a processor, cause the processor to perform the shift control method provided by the embodiments of the present disclosure.

[0103] The computer readable storage medium can take the form of one or more combinations of any type of readable media. The readable media can be a readable signal medium or a readable storage medium. The readable storage medium may, for example, include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0104] An embodiment of the present disclosure can also be a vehicle configured with the shift control device described above.

[0105] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0106] The above description is merely that of the specific embodiments of the present disclosure, to enable a person skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shift control method characterized by, The method comprises: In a case where an exhaust brake unit of a target vehicle is in an activated state, it is determined whether associated working condition information of the target vehicle satisfies a shift control condition; wherein the activated state represents that an exhaust brake function is opened and not actually acted, actual action represents that a corresponding brake force is generated through the exhaust brake function, the associated working condition information is working condition information having an associated relationship with the exhaust brake unit, the associated working condition information is used to determine whether the exhaust brake function is actually acted, and the shift control condition is a condition for shift control based on an engine speed and is used to represent that the exhaust brake function is determined to be actually acted based on the associated working condition information; If the associated working condition information satisfies the shift control condition, a clutch pressure value of the target vehicle is determined according to an engine speed of the target vehicle; The target vehicle is controlled to shift according to the clutch pressure value; The clutch pressure value of the target vehicle is determined according to the engine speed of the target vehicle, comprising: An input torque is determined based on an exhaust brake torque; wherein the exhaust brake torque is determined according to the engine speed and a pre-labeled speed-torque model, and the speed-torque model is a mathematical model representing the relationship between the engine speed and the exhaust brake torque; The input torque is input to a pressure calculation unit of the target vehicle, so that the pressure calculation unit determines the clutch pressure value according to the input torque.

2. The method of claim 1, wherein, The associated working condition information comprises user operation information and vehicle running information, and the shift control condition comprises a first shift control condition in a user operation dimension and a second shift control condition in a vehicle running dimension, The associated working condition information satisfies the shift control condition, comprising: The user operation information satisfies the first shift control condition, and the vehicle running information satisfies the second shift control.

3. The method of claim 2, wherein, The user operation information comprises an accelerator pedal opening degree and / or a driving mode, and the user operation information satisfies the first shift control condition, comprising: The accelerator pedal opening degree is not greater than a preset opening threshold, and / or the driving mode does not belong to a preset terrain mode; wherein the preset terrain mode comprises at least one of a multi-drive mode, a sand mode and an off-road mode.

4. The method of claim 2, wherein, The vehicle running information comprises a target gear value and / or the engine speed, and the vehicle running information satisfies the second shift control, comprising: The target gear value is not less than a preset gear value, and / or an exhaust brake torque determined according to the engine speed is not greater than a preset torque threshold.

5. The method of claim 1, wherein, The input torque is determined based on the exhaust brake torque, comprising: A calculation torque corresponding to a current time is determined according to the current time and a torque change function; wherein the torque change function is determined according to an initial time when the shift control condition is satisfied, a negative maximum torque and a pre-set function parameter value; If the calculation torque is not greater than the exhaust brake torque, the calculation torque is determined as the input torque. If the calculated torque is greater than the exhaust brake torque, the exhaust brake torque is determined as the input torque.

6. The method according to claim 1 or 4, characterized in that, The rotation speed torque model is determined according to adjustment of a pedal characteristic model corresponding to the target vehicle according to torque feedback information of a driver.

7. A shift control device characterized by comprising: Comprise: The judging module is configured to judge whether the associated working condition information of the target vehicle meets a shift control condition in a case that an exhaust brake unit of the target vehicle is in an activated state; wherein the activated state represents that an exhaust brake function is opened and not actually acted, the actually acted represents that a corresponding brake force is generated through the exhaust brake function, the associated working condition information is working condition information having an associated relationship with the exhaust brake unit, the associated working condition information is used to judge whether the exhaust brake function is actually acted, and the shift control condition is a condition for shift control based on engine rotation speed which is set in advance, and the shift control condition is used to represent that the exhaust brake function is actually acted based on the associated working condition information; The first determining module is configured to determine a clutch pressure value of the target vehicle according to the engine rotation speed of the target vehicle if the associated working condition information meets the shift control condition; The shift module is configured to perform shift control on the target vehicle according to the clutch pressure value. The determination of the clutch pressure value of the target vehicle according to the engine rotation speed of the target vehicle comprises: The input torque is determined based on the exhaust brake torque, wherein the exhaust brake torque is determined according to the engine rotation speed and a rotation speed torque model which is pre-labeled, and the rotation speed torque model is a mathematical model representing the relationship between the engine rotation speed and the exhaust brake torque; The input torque is input to a pressure calculation unit of the target vehicle, so that the pressure calculation unit determines the clutch pressure value according to the input torque.

8. An electronic device, comprising: The electronic device comprises: A processor; A memory for storing executable instructions of the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the shift control method according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used to execute the shift control method according to any one of claims 1-6. The storage medium stores a computer program, and the computer program is used to execute the shift control method according to any one of claims 1-6.

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