CN115234647B - Starting control method and system after STT interventional shutdown and vehicle - Google Patents
Starting control method and system after STT interventional shutdown and vehicle Download PDFInfo
- Publication number
- CN115234647B CN115234647B CN202210901332.1A CN202210901332A CN115234647B CN 115234647 B CN115234647 B CN 115234647B CN 202210901332 A CN202210901332 A CN 202210901332A CN 115234647 B CN115234647 B CN 115234647B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 230000001934 delay Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 abstract description 5
- 230000001133 acceleration Effects 0.000 description 6
- 239000000446 fuel Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/44—Inputs being a function of speed dependent on machine speed, e.g. the vehicle speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/70—Inputs being a function of gearing status dependent on the ratio established
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/50—Signals to an engine or motor
- F16H63/502—Signals to an engine or motor for smoothing gear shifts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H2059/366—Engine or motor speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0015—Transmission control for optimising fuel consumptions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
- F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
- F16H2061/062—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/50—Signals to an engine or motor
- F16H2063/508—Signals to an engine or motor for limiting transmission input torque, e.g. to prevent damage of transmission parts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention discloses a starting control method, a starting control system and a vehicle after STT intervention shutdown, wherein under the starting working condition of fast stepping medium and large accelerator after STT intervention shutdown, an automatic transmission control unit performs intervention control by controlling clutch oil filling pressure and sending a request for delaying response of engine torque and a request for limiting the engine torque to an engine control unit, and further the automatic transmission control unit sends a request for limiting the rising speed of the engine torque to the engine control unit, and the engine control unit executes the request. The invention can solve the problem of impact when the STT intervenes to stop and rapidly step on the middle and large accelerator to start, reduce complaints of users and improve the driving experience of the users.
Description
Technical Field
The invention belongs to the field of vehicle control, and particularly relates to a starting control method and system after STT interventional shutdown and a vehicle.
Background
In order to cope with the increasingly stringent fuel consumption regulation and the urgent low-consumption fuel consumption demands of users, engine STT (i.e. intelligent start-stop system) is widely applied to modern cars as a cost-effective fuel-saving scheme. However, when the user steps on the middle and large accelerator quickly after the stop (parking) is performed by using the STT, the problem of unsmooth starting impact often occurs. This situation is common in typical high-frequency use situations where a user stops by the intervention of an STT (short time traffic light) when the user stops at a red light such as an urban intersection, and the driver suddenly and rapidly steps on a medium and large accelerator to start after the green light is lighted, and is easy to cause great complaints of the user.
The conventional starting working condition is that a driver presses a brake pedal, then the gear shifting device is operated to exit the P gear and shift into the D gear through the N gear, finally, the driver slowly presses a small accelerator to start, and the power combination process of the engine and the transmission is smoother. In the starting condition after the STT intervention shutdown, if the driver quickly steps on the medium and large accelerator after lifting the brake pedal (i.e. the accelerator opening rapidly exceeds 40% within 10ms to reach the medium and large accelerator range after the driver steps on the accelerator pedal, see fig. 1), the vehicle gear shifting device is always in D gear in the process, and the starting torque of the engine is controlled under the condition of no external torque limiting request, and the starting control can only be performed based on the driver required torque of the accelerator opening. The torque and the rotation speed of the engine are suddenly increased, the rotation speed difference between the turbine rotation speed of the speed changer and the rotation speed of the engine is gradually increased, the rotation speed difference between the engine and the speed changer is larger before the combination of the engine and the speed changer, and the rotation speeds of the two parts tend to be consistent after the combination is completed; thus, a certain shock is generated during the coupling process, and the acceleration of the vehicle during the start-up process is represented as a short sudden increase and decrease (see fig. 2).
Disclosure of Invention
The invention aims to provide a starting control method and system after STT intervention shutdown and a vehicle, so as to solve the problem of impact during starting by stepping on a medium and large accelerator quickly after STT intervention shutdown and improve the driving experience of a user.
The starting control method after STT intervention shutdown comprises the following steps:
In response to meeting the rapid-tip-in large throttle start condition, the automatic transmission control unit (i.e., TCU) intervenes in control, and the automatic transmission control unit controls the clutch to be filled with oil until the oil pressure reaches a preset oil pressure threshold P, and sends a request to the engine control unit (i.e., ECU) to delay the response of the preset time to the engine torque and a request to limit the engine torque to a preset torque threshold T.
In response to receiving the request to delay the response of the preset time to the engine torque, the engine control unit delays the response of the preset time to the engine torque (i.e., delays the response of the engine torque after the preset time).
In response to receiving a request to limit the engine torque to a preset torque threshold T, the engine control unit limits the engine torque to the preset torque threshold T.
In response to the clutch oil pressure being greater than or equal to a preset oil pressure threshold value P and the engine torque being equal to a preset torque threshold value T, the automatic transmission control unit sends a request to the engine control unit to limit the rate of engine torque rise to a preset rate threshold value k.
In response to receiving a request to limit the rate of engine torque rise to a preset rate threshold k, the engine control unit limits the rate of engine torque rise to a preset rate threshold k.
In response to the engine torque being equal to the driver demand torque (indicative of vehicle launch completion), the automatic transmission control unit directs the vehicle to
The engine control unit sends an exit torque control message and the automatic transmission control unit exits the control.
In response to receiving the exit torque control message, the engine control unit controls the engine torque to the driver demand torque.
Preferably, if the conditions a-f are met at the same time, the condition that the condition of starting the accelerator in the middle and large steps is met is indicated; wherein,
The condition a is: the gear of the vehicle is the D gear,
The condition b is: a stop signal of the STT is detected,
The condition c is: the engine speed is set to 0,
The condition d is: the vehicle speed is 0,
The condition e is: the throttle opening is greater than a preset opening threshold,
The condition f is: the change rate of the accelerator opening is larger than a preset change rate threshold value.
Preferably, the preset opening threshold is 40%.
Preferably, the preset rate of change threshold is 4%/ms (i.e., 4% change in accelerator opening per millisecond, corresponding to a 40% increase in accelerator opening of 10 ms).
The invention relates to a starting control system after STT intervention shutdown, which comprises an automatic transmission control unit and an engine control unit; the launch control system is programmed to perform the above-described STT interventional post-shutdown launch control method.
The vehicle comprises the starting control system after the STT intervention shutdown.
The invention has the following effects:
(1) Under the starting working condition of fast stepping on the middle and large accelerator after the STT intervention shutdown, the automatic transmission control unit controls the oil filling pressure of the clutch and transmits a request for delaying response of engine torque and a request for limiting the engine torque to the engine control unit for intervention control, and the engine control unit executes the request, so that the stable output of the acceleration of the engine and the initial power combination stage of the transmission is effectively ensured, and the smoothness of the vehicle is ensured.
(2) Further, the automatic transmission control unit sends a request for limiting the rising speed of the engine torque to the engine control unit, the engine control unit executes the request, and the acceleration stable output from the power combination to the starting completion is effectively ensured through the control of the rising speed of the engine torque, so that the smoothness of the vehicle is ensured.
(3) After the vehicle is started, the automatic transmission control unit exits the control, and the engine torque control right is returned to the engine control unit, so that the operation of the vehicle according to the subsequent driving intention of the driver (namely, the torque required by the driver) is effectively ensured, and the normal performance of the vehicle driving performance is ensured.
(4) The problem of impact when the STT intervenes and stops and steps on the middle and large accelerator quickly is solved, user complaints are reduced, and the driving experience of the user is improved.
Drawings
Fig. 1 is a schematic view of a change in starting accelerator opening.
Fig. 2 is a schematic view of acceleration of a vehicle during a conventional starting shock.
Fig. 3 is a flowchart illustrating the execution of the TCU in the start control method after the STT intervention shutdown in this embodiment.
Fig. 4 is a flowchart of the execution of the ECU in the start control method after STT intervention shutdown in the present embodiment.
Fig. 5 is a schematic view of acceleration of the vehicle at the start of the present embodiment.
Detailed Description
As shown in fig. 3 and 4, the start control method after the STT intervention stop in the present embodiment is executed by an automatic transmission control unit (i.e., TCU) and an engine control unit (i.e., ECU).
As shown in fig. 3, the automatic transmission control unit performs the steps of:
And step S1, judging whether the quick stepping medium and large accelerator starting condition is met, if yes, executing step S2, and otherwise, ending.
And if the conditions a-f are met at the same time, the condition of quick-stepping medium and large accelerator starting is met, otherwise, the condition of quick-stepping medium and large accelerator starting is not met. The condition a is: the vehicle gear is D gear; the condition b is: a stop signal of the STT is detected (i.e., an STT set signal is detected); the condition c is: the engine speed is 0; the condition d is: the vehicle speed is 0; the condition e is: the throttle opening is more than 40%; the condition f is: the throttle opening rate of change is greater than 4%/ms (i.e., 4% change in throttle opening per millisecond, corresponding to a 40% increase in throttle opening of 10 ms).
Step S2, controlling the clutch to charge oil until the oil pressure reaches a preset oil pressure threshold value P, sending a request for delaying the response of the preset time to the engine torque and a request for limiting the engine torque to a preset torque threshold value T to an engine control unit, and then executing step S3.
And step S3, judging whether the clutch oil pressure is greater than or equal to a preset oil pressure threshold value P, and the engine torque is equal to a preset torque threshold value T, if so, executing step S5, otherwise, executing step S4.
And S4, controlling the clutch to charge oil until the oil pressure reaches a preset oil pressure threshold value P, sending a request for limiting the engine torque to a preset torque threshold value T to an engine control unit, and then returning to the step S3.
Step S5, a request to limit the rate of rise of the engine torque to a preset rate threshold k is sent to the engine control unit, and then step S6 is performed.
And S6, judging whether the engine torque is equal to the torque required by the driver, if so (indicating that the starting of the vehicle is completed), executing the step S7, otherwise, returning to the step S5.
Step S7, an exit torque control message (i.e., TCU exit control) is sent to the engine control unit, and then ends.
As shown in fig. 4, the engine control unit performs the steps of:
And step P1, judging whether a request for responding to the engine torque by delaying the preset time is received, if so, executing step P2, otherwise, ending.
Step P2, delay the response of the preset time to the engine torque, and then execute step P3.
And step P3, judging whether a request for limiting the engine torque to a preset torque threshold T is received, if so, executing step P4, and otherwise, ending.
Step P4, limiting the engine torque to a preset torque threshold T, and then performing step P5.
And step P5, judging whether a request for limiting the rising speed of the engine torque to a preset speed threshold k is received, if so, executing step P6, otherwise, returning to executing step P4.
Step P6, limiting the engine torque rising rate to a preset rate threshold k, and then executing step P7.
And P7, judging whether the exit torque control message is received, if so, executing the step P8, otherwise, returning to execute the step P6.
And P8, controlling the engine torque to be the torque required by the driver, and ending.
The embodiment also provides a starting control system after STT intervention shutdown, which comprises an automatic transmission control unit and an engine control unit. The automatic transmission control unit is programmed to perform the steps shown in fig. 3, and the engine control unit is programmed to perform the steps shown in fig. 4.
The embodiment also provides a vehicle, which comprises the start control system after the STT intervention shutdown.
After the start control method after the STT intervention shutdown in this embodiment is adopted, it can be found that the start impact problem is solved by objectively testing the acceleration of the vehicle (see fig. 5).
Claims (6)
1. A method for controlling start after an STT intervention shutdown, the method comprising:
in response to meeting the quick-stepping medium-large accelerator starting condition, the automatic transmission control unit controls the clutch to charge oil until the oil pressure reaches a preset oil pressure threshold value P, and sends a request for delaying the response of the preset time to the engine torque and a request for limiting the engine torque to a preset torque threshold value T to the engine control unit;
In response to receiving a request to delay a preset time to respond to the engine torque, the engine control unit delays the preset time to respond to the engine torque;
In response to receiving a request to limit the engine torque to a preset torque threshold T, the engine control unit limits the engine torque to the preset torque threshold T;
in response to the clutch oil pressure being greater than or equal to a preset oil pressure threshold value P and the engine torque being equal to a preset torque threshold value T, the automatic transmission control unit sends a request to the engine control unit to limit the rate of engine torque rise to a preset rate threshold value k;
in response to receiving a request to limit the rate of engine torque rise to a preset rate threshold k, the engine control unit limits the rate of engine torque rise to a preset rate threshold k;
in response to the engine torque being equal to the driver demand torque, the automatic transmission control unit sends an exit torque control message to the engine control unit;
In response to receiving the exit torque control message, the engine control unit controls the engine torque to the driver demand torque.
2. The method for start-up control after STT intervention shutdown of claim 1, wherein:
If the conditions a-f are met at the same time, the condition that the condition of starting the accelerator is met in the fast stepping mode is indicated; wherein,
The condition a is: the gear of the vehicle is the D gear,
The condition b is: a stop signal of the STT is detected,
The condition c is: the engine speed is set to 0,
The condition d is: the vehicle speed is 0,
The condition e is: the throttle opening is greater than a preset opening threshold,
The condition f is: the change rate of the accelerator opening is larger than a preset change rate threshold value.
3. The method for start-up control after STT intervention shutdown of claim 2, wherein: the preset opening threshold value is 40%.
4. The method for start-up control after STT intervention shutdown of claim 2, wherein: the preset change rate threshold is 4%/ms.
5. A start control system after STT intervention shutdown comprises an automatic transmission control unit and an engine control unit; the method is characterized in that: the launch control system being programmed to perform a launch control method as claimed in any one of claims 1 to 4.
6. A vehicle, characterized in that: comprising a start control system as claimed in claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210901332.1A CN115234647B (en) | 2022-07-28 | 2022-07-28 | Starting control method and system after STT interventional shutdown and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210901332.1A CN115234647B (en) | 2022-07-28 | 2022-07-28 | Starting control method and system after STT interventional shutdown and vehicle |
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| CN115234647A CN115234647A (en) | 2022-10-25 |
| CN115234647B true CN115234647B (en) | 2024-07-09 |
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| CN202210901332.1A Active CN115234647B (en) | 2022-07-28 | 2022-07-28 | Starting control method and system after STT interventional shutdown and vehicle |
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| CN115750776B (en) * | 2022-11-15 | 2024-09-03 | 重庆长安汽车股份有限公司 | Automatic parking and idle speed start-stop simultaneous working start control method and system and vehicle |
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| DE102020109751A1 (en) * | 2019-04-11 | 2020-10-15 | Ford Global Technologies, Llc | SYSTEMS AND PROCEDURES FOR CONTROLLING STOP / START EVENTS FOR A HYBRID ELECTRIC VEHICLE |
| CN113606330A (en) * | 2021-08-18 | 2021-11-05 | 安徽江淮汽车集团股份有限公司 | Starting control method for automobile double-clutch automatic transmission |
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| JPH0989094A (en) * | 1995-09-21 | 1997-03-31 | Toyota Motor Corp | Control device for engine and automatic transmission |
| JP4648587B2 (en) * | 2001-07-18 | 2011-03-09 | 本田技研工業株式会社 | Engine restart start control device in power transmission device |
| US6556910B2 (en) * | 2001-08-31 | 2003-04-29 | Aisin Aw Co., Ltd. | Control apparatus and method for vehicle having an idle stop function |
| KR100448363B1 (en) * | 2001-11-28 | 2004-09-10 | 현대자동차주식회사 | Method for engine torque reduction controlling in automatic transmission |
| CN113323762A (en) * | 2021-06-10 | 2021-08-31 | 奇瑞商用车（安徽）有限公司 | Starting control method for automatic transmission vehicle model |
| CN113323761B (en) * | 2021-06-23 | 2023-04-25 | 蜂巢传动科技河北有限公司 | Engine start-stop method and device for vehicle and vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020109751A1 (en) * | 2019-04-11 | 2020-10-15 | Ford Global Technologies, Llc | SYSTEMS AND PROCEDURES FOR CONTROLLING STOP / START EVENTS FOR A HYBRID ELECTRIC VEHICLE |
| CN113606330A (en) * | 2021-08-18 | 2021-11-05 | 安徽江淮汽车集团股份有限公司 | Starting control method for automobile double-clutch automatic transmission |
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