Automobile parking and starting engine torque control method and device and vehicle

Abstract

The application discloses a kind of automobile parking start engine torque control method, device and vehicle.Its control method includes determining the driving intention of driver according to the actual gear position or transmission neutral control state in the process of vehicle driving;When the driving intention of driver changes, the oil temperature in the current transmission is obtained, and the engine torque compensation delay time of vehicle is determined according to the oil temperature in the transmission;After the driving intention changes and the torque compensation delay time, the engine outputs torque according to the change of driving intention.It realizes the delay time of torque compensation intervention or exit of engine when the driving intention of driver changes, so as to improve noise and reduce fuel consumption under the premise of ensuring that the vehicle is static, avoid the jerk in the process of neutral control, and reduce the response impact of engine output torque control, and then keep the vehicle in a stable and comfortable state during vehicle parking or starting.

Description

Technical Field

[0001] The embodiments of the present invention relate to engine torque control technology, and more particularly to a method, device and vehicle for controlling engine torque when starting and stopping a car. Background Technology

[0002] With the development of the automotive industry, drivers have increasingly higher demands for the driving experience. During the stop-and-start process, drivers pay more attention to the vehicle's acceleration and speed control.

[0003] Currently, there are four common types of automatic transmissions in automobiles: hydraulic automatic transmissions (AT), continuously variable transmissions (CVT), automated manual transmissions (AMT), and dual-clutch automatic transmissions (DCT). Automatic transmissions with neutral gear control can reduce vehicle vibration and noise when the vehicle is stationary, and can reduce fuel consumption when the vehicle is in Drive (D) and the brake is applied for extended periods at red lights. However, existing engine torque control methods, due to changes in the neutral gear control state of the automatic transmission, can result in insufficient or excessive engine torque output. This leads to significant engine speed fluctuations during the interaction between the automatic transmission and engine torque control, causing inaccurate vehicle acceleration and speed control. Consequently, the stability and comfort of the vehicle during parking and starting cannot be guaranteed, negatively impacting the driver's experience. Summary of the Invention

[0004] This invention provides a method, device, and vehicle for controlling engine torque during vehicle parking and starting, so as to improve noise and reduce fuel consumption when the vehicle is static, avoid jerking during neutral control, reduce the response shock of engine output torque control, and thus keep the vehicle in a stable and comfortable state during parking or starting.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling engine torque during vehicle start-up from a standstill, comprising:

[0006] Determine the driver's driving intention based on the actual gear position or neutral gear control status of the transmission during vehicle operation;

[0007] When the driver's driving intention changes, the current oil temperature in the transmission is obtained, and the vehicle engine torque compensation delay time is determined based on the oil temperature in the transmission.

[0008] After the driving intention changes and the torque compensation delay time has elapsed, the engine outputs torque according to the change in driving intention.

[0009] Furthermore, based on the actual gear position information and the neutral gear control status of the transmission during vehicle operation, the driver's driving intention is determined, including:

[0010] The system acquires the actual gear position information and the neutral control status of the transmission during vehicle operation. When the actual gear position during vehicle operation is park or neutral, or when the neutral control status of the transmission is in the first or second state, the vehicle's driving intention is to stop; otherwise, the driver's driving intention is to start. The first state is when the clutch of the transmission is disengaged, and the second state is when the neutral control of the transmission is engaged.

[0011] Furthermore, when the vehicle's driving intention changes, the current oil temperature in the transmission is obtained, and the vehicle engine torque compensation delay time is determined based on the change in driving intention and the oil temperature in the transmission, including:

[0012] When the driver's driving intention changes from parking intention to driving intention, the current oil temperature in the transmission is obtained, and the torque compensation delay intervention time is determined based on the oil temperature in the transmission; wherein, the lower the oil temperature in the transmission, the longer the torque compensation delay intervention time.

[0013] Furthermore, after the change in driving intention and the torque compensation delay time, the engine outputs torque according to the change in driving intention, including:

[0014] After the time it takes for the driving intention to change from the parking intention to the driving intention is greater than the torque compensation delay intervention time, the engine outputs torque with transmission torque compensation.

[0015] Furthermore, the step of obtaining the current oil temperature in the transmission when the driver's driving intention changes, and determining the vehicle engine torque compensation delay time based on the change in driving intention and the oil temperature in the transmission, further includes:

[0016] When the driver's driving intention changes from driving intention to parking intention, the current oil temperature in the transmission is obtained, and the torque compensation delay exit time is determined based on the oil temperature in the transmission.

[0017] Furthermore, after the change in driving intention and the torque compensation delay time, the engine outputs torque according to the change in driving intention, including:

[0018] After the time it takes for the driving intention to change from the driving intention to the parking intention is greater than the torque compensation delay exit time, the engine outputs torque without gearbox torque compensation.

[0019] Furthermore, the method also includes maintaining the current torque output of the engine if the driving intention does not change. In a second aspect, embodiments of the present invention also provide a vehicle stop-start engine torque control device, comprising:

[0020] The determination module is used to determine the driver's driving intention based on the actual gear position or the neutral control state of the transmission during vehicle operation.

[0021] The acquisition module is used to acquire the current oil temperature in the transmission when the driver's driving intention changes, and to determine the vehicle engine torque compensation delay time based on the oil temperature in the transmission.

[0022] The compensation module is used to enable the engine to output torque according to the change in driving intention after the torque compensation delay time has elapsed.

[0023] Furthermore, the determining module includes:

[0024] The status acquisition unit is used to acquire the actual gear information and the neutral gear control status of the transmission during vehicle operation;

[0025] The intention determination unit is used to determine the driver's driving intention as a parking intention when the actual gear position during vehicle driving is parking or neutral, or when the neutral control state of the transmission is in the first state or the second state; otherwise, the driver's driving intention is a starting intention. The first state is when the clutch of the transmission is in the disengaged stage, and the second state is when the neutral control of the transmission is in the engaged stage.

[0026] Thirdly, embodiments of the present invention also provide a vehicle, including the aforementioned automobile stop-start engine torque control device.

[0027] This invention provides a method, device, and vehicle for controlling engine torque during vehicle parking and starting. The control method determines the driver's driving intention based on the actual gear position or neutral gear control state during vehicle operation. When the driver's driving intention changes, the current oil temperature in the transmission is obtained, and an engine torque compensation delay time is determined based on this temperature. After the driving intention changes and the torque compensation delay time has elapsed, the engine outputs torque according to the change in driving intention. This achieves the goal of controlling the delay time of engine torque compensation intervention or disengagement based on the current oil temperature in the automatic transmission when the driver's driving intention changes, allowing the engine to output torque according to the change in driving intention. This avoids jerking during neutral gear control and reduces the response shock of engine output torque control while improving noise and reducing fuel consumption when the vehicle is stationary, thus maintaining a smooth and comfortable state for the vehicle during parking or starting. Attached Figure Description

[0028] Figure 1 A flowchart of an engine torque control method for starting and stopping a car, provided as an embodiment of the present invention.

[0029] Figure 2 A flowchart of another method for controlling engine torque when starting and stopping a car, provided as an embodiment of the present invention.

[0030] Figure 3 This is a flowchart for determining a driver's driving intention, provided as an embodiment of the present invention.

[0031] Figure 4 A flowchart of another method for controlling engine torque when starting and stopping a car, provided as an embodiment of the present invention.

[0032] Figure 5 This is a flowchart of automobile shutdown and start-up torque control provided in an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of an engine torque control device for automobile parking and starting, provided in an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of another automobile engine torque control device provided in an embodiment of the present invention. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] Figure 1 A flowchart of an engine torque control method for starting and stopping a car is provided in an embodiment of the present invention, with reference to... Figure 1 The method specifically includes the following steps:

[0037] S100: Determine the driver's driving intention based on the actual gear position or neutral gear control status of the transmission during vehicle operation.

[0038] The actual gears used during vehicle operation include Park (P), Neutral (N), Reverse (R), and Drive (D). Vehicles with automatic transmissions can automatically shift forward gears based on vehicle speed and engine speed. The transmission's neutral control states include clutch disengagement, neutral control engagement, clutch engagement, and neutral control disengagement. These can be represented as follows: State 1 (clutch disengagement), State 2 (neutral control engagement), State 3 (clutch engagement), and State 0 (neutral control disengagement). Throughout these changes in neutral control state, the actual gear selected by the transmission remains constant.

[0039] Specifically, during vehicle operation, when the driver shifts gears, by judging the actual gear information and the automatic transmission's neutral control status, it's possible to determine whether the driver intends to stop or start, and output a driving intention indicator signal. For example, when the actual gear is P or N, the driving intention indicator is 0, indicating the vehicle is stopped; when the actual gear is R or D, the driving intention indicator is 1, indicating the vehicle is starting or moving. When the driving intention indicator changes, it indicates a change in the driver's driving intention. For instance, when the driving intention indicator changes from 0 to 1, it indicates the driver's intention to start; when it changes from 1 to 0, it indicates the driver's intention to stop. By determining the driver's driving intention, the timing of the engine's delayed intervention and disengagement of transmission torque compensation can be determined, achieving smooth vehicle control when stopping and starting.

[0040] S200: When the driver's driving intention changes, the current oil temperature in the transmission is obtained, and the engine torque compensation delay time is determined based on the oil temperature in the transmission.

[0041] Specifically, the engine can compensate the transmission for torque during gear shifts, ensuring that the total torque at the wheel ends of the powertrain remains stable throughout the shift, thus achieving uninterrupted power transitions. Factors affecting the magnitude of the engine's compensation torque include transmission oil temperature, steady-state engine speed, and clutch speed. The engine torque compensation delay time is the time during which the engine delays or de-emerges from torque compensation during gear shifts. For example, different oil temperatures correspond to different torque compensation delay times depending on the driver's intention to start or stop. Different transmission oil temperatures can be set to correspond to different torque compensation delay times; lower oil temperatures result in greater friction and a longer torque compensation delay time.

[0042] S300: When the driving intention changes and after a torque compensation delay time, the engine outputs torque according to the change in driving intention.

[0043] Specifically, after a change in driving intention and a torque compensation delay period, the engine compensates the transmission for torque. For example, if the driver's intention is to start, after the torque compensation delay period, the transmission torque compensation flag is 1, and the engine outputs torque with transmission torque compensation. If the driver's intention is to stop, after the torque compensation delay period, the transmission torque compensation flag is 0, and the engine outputs torque without transmission torque compensation. If the driving intention flag remains unchanged, the engine outputs the torque previously output based on the previous transmission torque compensation flag. This improves noise and reduces fuel consumption when the vehicle is stationary, while avoiding jerking during neutral gear control and reducing the response shock of engine output torque control, thus maintaining a smooth and comfortable vehicle during stopping or starting.

[0044] The technical solution of this embodiment determines the driver's driving intention based on the actual gear position or neutral control state of the transmission during vehicle operation. When the driver's driving intention changes, the current oil temperature in the transmission is obtained, and the engine torque compensation delay time is determined based on the transmission oil temperature. After the driving intention changes and the torque compensation delay time has elapsed, the engine outputs torque according to the change in driving intention. This achieves the goal of controlling the engine to output torque according to the change in driving intention based on the current oil temperature in the automatic transmission, after the torque compensation delay time, thereby avoiding jerking during neutral control and reducing the response impact of engine output torque control while ensuring improved noise and reduced fuel consumption when the vehicle is stationary. This, in turn, maintains a smooth and comfortable state for the vehicle during parking or starting.

[0045] Figure 2A flowchart of another method for controlling engine torque during vehicle start-up and parking provided by an embodiment of the present invention is shown below. Figure 2 As shown, the method includes:

[0046] S110. Obtain the actual gear information and transmission neutral control status during vehicle driving. When the actual gear during vehicle driving is parking or neutral, or when the transmission neutral control status is in the first or second state, the vehicle's driving intention is to stop. Otherwise, the driver's driving intention is to start.

[0047] Among them, after obtaining the actual gear information and the neutral control status of the transmission during the vehicle's driving process, the current vehicle status can be determined by the actual gear information and the neutral control status of the transmission, and then the driver's driving intention can be determined when the vehicle status changes. Figure 3 A flowchart for determining a driver's driving intention is provided as an embodiment of the present invention, such as... Figure 3 As shown, the method includes:

[0048] S1: The actual gear is P or N, or the neutral control status is 1 or 2. If so, proceed to S2; otherwise, proceed to S3.

[0049] Determine if the actual gear is P or N, or if the neutral control status is state 1 or state 2, indicating the driver's intention to stop. When the driver shifts into D or R, the clutch is either disengaged or already disengaged, indicating the vehicle is in a stopped state. If so, proceed to S2; otherwise, proceed to S3.

[0050] S2, the driving intention indicator is 0.

[0051] When the vehicle is in Drive (D) gear, and there is a long red light ahead, the driver presses the brake pedal to stop the vehicle. During this process, the neutral gear control state will change from state 0 to state 1, and from state 1 to state 2. When the neutral gear control state enters state 1 or state 2, the driving intention indicator is 0, indicating that the vehicle is in a parked state.

[0052] S3, the driving intention sign is 1.

[0053] When the vehicle is in D gear and the red light ahead turns green, the driver releases the brake pedal. During this process, the neutral gear control status will change from 2 to 3 and from 3 to 0. When the neutral gear control status enters 3, the driving intention indicator is 1, indicating that the vehicle is in the starting state. When the neutral gear control status enters 0, the driving intention indicator is still 1, indicating that the vehicle is in the driving state.

[0054] When the driving intention indicator changes, it indicates that the driver's driving intention has changed. When the driver's driving intention changes, it is necessary to control whether the engine output has torque compensation from the transmission, so as to keep the vehicle in a smooth and comfortable state during the stopping or starting process.

[0055] S210. When the driver's driving intention changes from parking intention to driving intention, the current oil temperature in the transmission is obtained, and the torque compensation delay intervention time is determined based on the oil temperature in the transmission.

[0056] The lower the oil temperature inside the transmission, the longer the torque compensation delay intervention time.

[0057] Specifically, when the driving intention indicator changes from 0 to 1, it indicates that the driver's driving intention has changed from a parking intention to a driving intention, and the vehicle is about to start moving. For example, when the vehicle is in D gear and the traffic light ahead turns green, the driver releases the brake pedal. During this process, the neutral gear control state will change from state 2 to state 3, and then from state 3 to state 0. When the neutral gear control state changes from state 2 to state 3, the driving intention indicator simultaneously changes from 0 to 1. Or, when the vehicle is in R gear, and the neutral gear control state changes from state 2 to state 3, the driving intention indicator also simultaneously changes from state 0 to state 1.

[0058] When the driver's intention changes from parking to driving, the current transmission oil temperature is obtained. Based on a table comparing transmission oil temperature with torque compensation delay time, the engine torque compensation delay intervention time can be determined. This table can be obtained through multiple tests on this vehicle model to achieve the optimal ratio. The lower the transmission oil temperature, the longer the torque compensation delay intervention time. This delay, by adjusting the torque compensation intervention time, aims to improve noise and reduce fuel consumption when the vehicle is stationary, while avoiding jerking during neutral gear control and reducing the response shock of engine output torque control.

[0059] S310: When the time for the driving intention to change from parking intention to driving intention is greater than the torque compensation delay intervention time, the engine outputs torque with transmission torque compensation.

[0060] Specifically, the transmission requires additional torque consumption during and after engagement. Torque compensation refers to the engine outputting additional torque to offset this loss. When the driving intention changes from a stop intention to a drive intention, and after the torque compensation delay intervention time, the engine performs torque compensation on the transmission, outputting torque with transmission torque compensation. For example, if the current transmission oil temperature is 60℃, the torque compensation delay intervention time T1 = 500ms is obtained from a table based on the transmission oil temperature value. After the torque compensation delay intervention time T1 = 500ms, the transmission torque compensation flag changes from 0 to 1. After the transmission torque compensation flag is 1, the engine outputs torque with transmission torque compensation, reducing the impact during clutch engagement.

[0061] Figure 4 A flowchart of another method for controlling engine torque during vehicle start-up and parking provided by an embodiment of the present invention is shown below. Figure 4 As shown, the method includes:

[0062] S110. Obtain the actual gear information and transmission neutral control status during vehicle driving. When the actual gear during vehicle driving is parking or neutral, or when the transmission neutral control status is in the first or second state, the vehicle's driving intention is to stop. Otherwise, the driver's driving intention is to start.

[0063] S220. When the driver's driving intention changes from driving intention to parking intention, the current oil temperature in the transmission is obtained, and the torque compensation delay exit time is determined based on the oil temperature in the transmission.

[0064] Specifically, when the driver's intention changes from driving to stopping, the current transmission oil temperature is obtained. Based on a table comparing transmission oil temperature with torque compensation delay time, the torque compensation delay exit time is determined. This table can be obtained through multiple tests on the specific vehicle model to determine the optimal table. Different vehicle models may use different tables for this comparison. By delaying the torque compensation exit time, the vehicle maintains torque compensation throughout the driving process. When the driver intends to stop, the engine ceases torque compensation after the delay time. This approach, while improving noise and reducing fuel consumption when the vehicle is stationary, avoids jerking during neutral gear control and reduces the response shock of engine output torque control.

[0065] S320. After the time it takes for the driving intention to change from driving intention to parking intention is greater than the torque compensation delay exit time, the engine outputs torque without gearbox torque compensation.

[0066] Specifically, the vehicle maintains a transmission torque compensation state throughout the driving process. When the driving intention changes from a stop intention to a drive intention and the torque compensation delay disengagement time has elapsed, the engine stops providing torque compensation to the transmission, and the engine outputs torque without transmission torque compensation. For example, if the current transmission oil temperature is 20°C, the second delay time T2 = 600ms is obtained from a table based on the transmission oil temperature value. After the transmission torque compensation flag delay time T2 = 600ms, it changes from 1 to 0, reducing the impact during clutch disengagement. T1 and T2 are not directly related in magnitude; they are determined based on the transmission oil temperature. The lower the oil temperature, the greater the friction, and the longer the torque compensation delay disengagement time. Furthermore, the magnitude of the transmission compensation torque is affected by: transmission oil temperature, steady-state engine speed, and clutch speed.

[0067] Furthermore, if the driving intention remains unchanged, the engine maintains its current torque output.

[0068] Specifically, if the driving intention indicator does not change, and if the previous transmission torque compensation indicator was 1, then the engine maintains output torque with transmission torque compensation. If the previous transmission torque compensation indicator was 0, then the engine maintains output torque without transmission torque compensation, that is, the engine maintains the current torque output.

[0069] Furthermore, Figure 5 A flowchart of automobile shutdown and start-up torque control is provided as an embodiment of the present invention, such as Figure 5 As shown, the method includes:

[0070] S4: Determine if the driving intention indicator has changed. If it has, proceed to S2; otherwise, proceed to S11.

[0071] S5: Determine if the driving intention indicator changes from 0 to 1. If yes, proceed to S3; otherwise, proceed to S5.

[0072] S6: After delaying T1, the transmission torque compensation flag changes from 0 to 1.

[0073] Specifically, when the driver's driving intention changes from parking to driving, the current oil temperature in the transmission is obtained. Based on the comparison table between the oil temperature in the transmission and the torque compensation delay time of the vehicle engine, the torque compensation delay time T1 is determined. The transmission torque compensation flag changes from 0 to 1 after the torque compensation delay time T1.

[0074] S7: When the transmission torque compensation flag is set to 1, the output torque is compensated by the transmission torque.

[0075] S8: Determine whether the driving intention indicator has changed from 1 to 0. If yes, proceed to S6; otherwise, proceed to S1.

[0076] Specifically, when the vehicle is in Drive (D) and there is a long wait at a red light, the driver applies the brake pedal to stop the vehicle. During this process, the neutral gear control status changes from 0 to 1, and then from 1 to 2. When the neutral gear control status changes from 0 to 1, the driving intention indicator simultaneously changes from 1 to 0. Alternatively, when the vehicle is in Reverse (R), if the neutral gear control status changes from 0 to 1, the driving intention indicator also changes from 1 to 0. Or, if the vehicle is stationary, the neutral gear control status is 0 in Reverse; shifting to Neutral (N) causes the driving intention indicator to change from 1 to 0.

[0077] S9: After delaying T2, the transmission torque compensation flag changes from 1 to 0.

[0078] Specifically, the current oil temperature in the transmission is obtained, the torque compensation delay exit time T2 is obtained by looking up the table, and the transmission torque compensation flag changes from 1 to 0 after the torque compensation delay exit time T2.

[0079] S10: When the transmission torque compensation flag is 0, the output torque is without transmission torque compensation.

[0080] Specifically, after the transmission torque compensation flag is set to 0, the engine stops torque compensation after a delay period and outputs torque without transmission torque compensation.

[0081] S11: If the driving intention indicator has not changed, the previous transmission torque compensation indicator and torque status will be maintained.

[0082] Compared with the prior art, this embodiment, for automatic transmissions with neutral control, considers the state changes of neutral control, the torque compensation control of the automatic transmission, and the influence of the automatic transmission oil temperature on the torque compensation delay time. Based on the actual gear information sent by the automatic transmission and the current oil temperature within the transmission, the engine torque compensation time for neutral control is increased or decreased during vehicle stop or start-up. This is used to switch the transmission torque compensation control strategy during neutral control. While ensuring improved noise and reduced fuel consumption when the vehicle is stationary, this avoids jerking during neutral control and reduces the response impact of engine output torque control. Therefore, during vehicle stop or start-up, the vehicle remains in a stable and comfortable state, improving the driver's driving experience.

[0083] Figure 6 This is a schematic diagram of a vehicle stop-start engine torque control device provided in an embodiment of the present invention. The device in this embodiment can execute the vehicle stop-start engine torque control method described in the above embodiments, such as... Figure 6 As shown, the device includes:

[0084] The determination module 110 is used to determine the driver's driving intention based on the actual gear position or the neutral control state of the transmission during vehicle operation.

[0085] Specifically, during vehicle operation, when the driver performs a gear shift, the determination module 110, after acquiring the actual gear information and the neutral control status of the transmission during vehicle operation, can determine the current vehicle status through the actual gear information and the neutral control status of the transmission. Then, when the vehicle status changes, it can determine the driver's driving intention, determine whether the driver intends to stop or start, and output a driving intention flag signal to the acquisition module 120. A driving intention flag of 0 indicates that the vehicle is in a stopped state, and a driving intention flag of 1 indicates that the vehicle is in a driving state.

[0086] The acquisition module 120 is used to acquire the current oil temperature in the transmission when the driver's driving intention changes, and to determine the engine torque compensation delay time based on the oil temperature in the transmission.

[0087] Specifically, changes in the driving intention indicator determine whether the driver intends to stop or start. When the driving intention indicator changes from 0 to 1, it indicates that the driver's intention has changed from stopping to driving, and the vehicle should start. When the driving intention indicator changes from 1 to 0, it indicates that the driver's intention has changed from driving to stopping, and the vehicle should stop. The current transmission oil temperature is obtained to determine the delay time for engine torque compensation to the transmission. This torque compensation delay time can be determined using a table that compares transmission oil temperature to torque compensation delay time. This table can be obtained through multiple tests on this vehicle model to achieve the optimal comparison. Lower transmission oil temperature results in a longer torque compensation delay time. This torque compensation delay time, while improving noise and reducing fuel consumption when the vehicle is stationary, avoids jerking during neutral gear control and reduces the response shock of engine output torque control.

[0088] The compensation module 130 is used to enable the engine to output torque according to the change in driving intention after a torque compensation delay time has elapsed.

[0089] Specifically, by determining the delay time of transmission torque compensation, and then increasing or decreasing the engine torque compensation delay time of neutral control when the vehicle is stopped and started, the torque output is either with or without transmission torque compensation. This avoids jerking during neutral control and reduces the response shock of engine output torque control while ensuring improved noise and reduced fuel consumption when the vehicle is stationary. As a result, the vehicle remains in a smooth and comfortable state when stopped or started.

[0090] The technical solution of this embodiment determines the driver's driving intention through a determining module based on the actual gear position or neutral control state of the transmission during vehicle operation. When the driver's driving intention changes, an acquiring module obtains the current oil temperature within the transmission and determines the engine torque compensation delay time based on this temperature. The compensation module, after the driving intention changes and the torque compensation delay time has elapsed, ensures the engine outputs torque according to the change in driving intention. This achieves the goal of controlling the engine to output torque according to the change in driving intention based on the current oil temperature within the automatic transmission, after the torque compensation delay time. This avoids jerking during neutral control and reduces the response shock of engine output torque control while improving noise and reducing fuel consumption when the vehicle is stationary, thus maintaining a smooth and comfortable state for the vehicle during parking or starting.

[0091] Furthermore, Figure 7 This is a schematic diagram of another automobile stop-start engine torque control device provided in an embodiment of the present invention. Figure 7 As shown, module 110 includes:

[0092] The status acquisition unit 111 is used to acquire the actual gear information and the neutral control status of the transmission during vehicle operation.

[0093] Specifically, the actual gears during vehicle operation include Park (P), Neutral (N), Reverse (R), and Drive (D). The transmission's neutral control states include clutch disengagement, neutral control engagement, clutch engagement, and neutral control disengagement. The first state represents clutch disengagement, the second state represents neutral control engagement, the third state represents clutch engagement, and the zeroth state represents neutral control disengagement. Throughout these changes in the automatic transmission's neutral control state, the actual gear remains unchanged.

[0094] The intention determination unit 112 is used to determine the driver's driving intention as a parking intention when the actual gear position during vehicle driving is parking or neutral, or when the neutral control state of the transmission is in the first state or the second state; otherwise, the driver's driving intention is a starting intention. The first state is when the clutch of the transmission is in the disengaged stage, and the second state is when the neutral control of the transmission is in the engaged stage.

[0095] This invention also provides a vehicle including the engine torque control device described in the above embodiments. This device controls the engine to output torque according to the change in the driver's driving intention after a torque compensation delay time, based on the current oil temperature in the automatic transmission. This avoids jerking during neutral gear control and reduces the response shock of engine output torque control while ensuring improved noise and reduced fuel consumption when the vehicle is stationary. As a result, the vehicle remains in a stable and comfortable state during parking or starting.

[0096] Of course, the vehicle provided in the embodiments of the present invention includes, but is not limited to, the automobile stop-start engine torque control device as described above, and can also perform related operations in the automobile stop-start engine torque control method provided in any embodiment of the present invention.

[0097] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for controlling engine torque during vehicle start-up and parking, characterized in that, include: Determine the driver's driving intention based on the actual gear position or neutral gear control status of the transmission during vehicle operation; When the driver's driving intention changes, the current oil temperature in the transmission is obtained, and the vehicle engine torque compensation delay time is determined based on the change in driving intention and the oil temperature in the transmission. After the driving intention changes and the torque compensation delay time has elapsed, the engine outputs torque according to the change in driving intention. When the driving intention of the vehicle changes, the current oil temperature in the transmission is obtained, and the engine torque compensation delay time is determined based on the change in driving intention and the oil temperature in the transmission. This includes: when the driver's driving intention changes from parking intention to driving intention, the current oil temperature in the transmission is obtained, and the torque compensation delay intervention time is determined based on the oil temperature in the transmission; wherein, the lower the oil temperature in the transmission, the longer the torque compensation delay intervention time. The step of causing the engine to output torque according to the change in driving intention after the torque compensation delay time has elapsed includes: after the time for the driving intention to change from the parking intention to the driving intention is greater than the torque compensation delay intervention time, the engine outputs torque with transmission torque compensation.

2. The method according to claim 1, characterized in that, The process of determining the driver's driving intention based on the actual gear position information and the neutral gear control status of the transmission during vehicle operation includes: The system acquires the actual gear position information and the neutral control status of the transmission during vehicle operation. When the actual gear position during vehicle operation is parking or neutral, or when the neutral control status of the transmission is in the first or second state, the driving intention of the vehicle is the parking intention; otherwise, the driving intention of the driver is the starting intention. The first state is when the clutch of the transmission is in the disengaged stage, and the second state is when the neutral control of the transmission is in the engaged stage.

3. The method according to claim 2, characterized in that, The step of obtaining the current oil temperature in the transmission when the driver's driving intention changes, and determining the vehicle engine torque compensation delay time based on the change in driving intention and the transmission oil temperature, further includes: When the driver's driving intention changes from driving intention to parking intention, the current oil temperature in the transmission is obtained, and the torque compensation delay exit time is determined based on the oil temperature in the transmission.

4. The method according to claim 3, characterized in that, After the change in driving intention and the torque compensation delay time, the engine outputs torque according to the change in driving intention, including: After the time it takes for the driving intention to change from the driving intention to the parking intention is greater than the torque compensation delay exit time, the engine outputs torque without gearbox torque compensation.

5. The method according to claim 1, characterized in that, Also includes: If the driving intention does not change, the engine maintains its current torque output.

6. A vehicle start-stop engine torque control device, characterized in that, include: The determination module is used to determine the driver's driving intention based on the actual gear position or the neutral control state of the transmission during vehicle operation. The acquisition module is used to acquire the current oil temperature in the transmission when the driver's driving intention changes, and to determine the vehicle engine torque compensation delay time based on the driver's driving intention and the oil temperature in the transmission. When the driving intention of the vehicle changes, the current oil temperature in the transmission is obtained, and the engine torque compensation delay time is determined based on the change in driving intention and the oil temperature in the transmission. This includes: when the driver's driving intention changes from parking intention to driving intention, the current oil temperature in the transmission is obtained, and the torque compensation delay intervention time is determined based on the oil temperature in the transmission; wherein, the lower the oil temperature in the transmission, the longer the torque compensation delay intervention time. The compensation module is used to enable the engine to output torque according to the change in driving intention after the torque compensation delay time has elapsed; The step of causing the engine to output torque according to the change in driving intention after the torque compensation delay time has elapsed includes: after the time for the driving intention to change from the parking intention to the driving intention is greater than the torque compensation delay intervention time, the engine outputs torque with transmission torque compensation.

7. The automobile stop-start engine torque control device according to claim 6, characterized in that, The determining module includes: The status acquisition unit is used to acquire the actual gear information and the neutral gear control status of the transmission during vehicle operation; The intention determination unit is used to determine the driver's driving intention as a parking intention when the actual gear position during vehicle driving is parking or neutral, or when the neutral control state of the transmission is in the first state or the second state; otherwise, the driver's driving intention is a starting intention. The first state is when the clutch of the transmission is in the disengaged stage, and the second state is when the neutral control of the transmission is in the engaged stage.

8. A vehicle, characterized in that, Includes the vehicle stop-start engine torque control device as described in any one of claims 6-7.

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