CN114312730B - Method for limiting engine torque when starting vehicle and computer readable storage medium - Google Patents
Method for limiting engine torque when starting vehicle and computer readable storage medium Download PDFInfo
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Abstract
The application discloses a method for limiting engine torque when a vehicle starts and a computer readable storage medium, wherein the method for limiting engine torque when the vehicle starts comprises the following steps: determining a current gear of the vehicle and determining a current clutch pressure value; determining an engine torque gradient value according to the current gear and the current clutch pressure value; the output torque of the engine is limited according to the engine torque gradient value. Therefore, the engine rotating speed can be prevented from floating upwards when the vehicle starts, smoothness when the vehicle starts is improved, and user experience is improved.
Description
Technical Field
The present application relates to the field of vehicle control technology, and in particular, to a method for limiting engine torque when a vehicle starts and a computer readable storage medium.
Background
For the existing vehicles with double clutch transmissions, because different gears share one clutch, for example, a first gear and a R gear (reverse gear) share one clutch, when the vehicle starts to step with the R gear, the torque of the engine rises faster and is higher than the combination speed of the clutch, so that the engine speed floats upwards, and the driving comfort of the vehicle is affected.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present application is to provide a method for limiting engine torque when a vehicle starts, wherein an engine torque gradient value is determined by a current gear and a clutch pressure value when the vehicle starts, and an output torque of the engine is limited according to the engine torque gradient value, so that an engine speed can be prevented from drifting upwards when the vehicle starts, smoothness when the vehicle starts is improved, and driving comfort of the vehicle is improved.
A second object of the present application is to propose a computer readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present application provides a method for limiting engine torque when a vehicle starts, the method comprising: determining a current gear of the vehicle and determining a current clutch pressure value; determining an engine torque gradient value according to the current gear and the current clutch pressure value; the output torque of the engine is limited according to the engine torque gradient value.
According to the method for limiting the engine torque when the vehicle starts, the current gear and the current clutch pressure value of the vehicle are determined, the engine torque gradient value is determined according to the current gear and the clutch pressure value, and the output torque of the engine is limited according to the engine torque gradient value, so that the engine speed can be prevented from drifting upwards when the vehicle starts, the smoothness when the vehicle starts is improved, and the driving comfort of the vehicle is improved.
In addition, the engine torque limiting method at the time of vehicle start according to the above embodiment of the application may have the following additional features:
according to one embodiment of the application, determining an engine torque gradient value from a current gear and a current clutch pressure value includes: determining a first engine torque gradient value corresponding to a current gear when the current clutch pressure value is above a clutch transfer torque point; and determining a second engine torque gradient value corresponding to the current gear when the current clutch pressure value is below the clutch transmission torque point, wherein the second engine torque gradient value is greater than the first engine torque gradient value.
According to one embodiment of the application, before limiting the output torque of the engine according to the engine torque gradient value, the method further comprises: determining a current driving mode of the vehicle; the engine torque gradient value is adjusted according to the current driving mode.
According to one embodiment of the application, adjusting the engine torque gradient value according to the current driving mode includes: when the current driving mode is a sport mode, the torque gradient value of the engine is subjected to reinforcement limitation; when the current driving mode is the economy mode, the engine torque gradient value is subjected to a reduction restriction.
According to one embodiment of the application the vehicle comprises a first starting gear and a second starting gear, the first starting gear corresponding to an engine torque gradient value being different from the second starting gear corresponding to an engine torque gradient value when the first starting gear and the second starting gear are in the same clutch.
According to an embodiment of the application, when the first starting gear is a forward gear and the second starting gear is a reverse gear, the engine torque gradient value corresponding to the first starting gear is greater than the engine torque gradient value corresponding to the second starting gear.
According to one embodiment of the application, the first engine torque gradient value corresponding to the first gear is 170-300Nm/s, and the second engine torque gradient value corresponding to the first gear is 500-2000Nm/s; the second starting gear corresponds to a first engine torque gradient of 100-150Nm/s and the first starting gear corresponds to a second engine torque gradient of 150-200Nm/s.
To achieve the above object, an embodiment of a second aspect of the present application provides a computer-readable storage medium having stored thereon a vehicle start-time engine torque limiting program that, when executed by a processor, implements the vehicle start-time engine torque limiting method described in the above embodiment.
According to the computer readable storage medium, when the stored vehicle starting engine torque limiting program is executed by the processor, the output torque of the engine is limited according to the engine torque gradient value by executing the vehicle starting engine torque limiting program, so that the engine rotating speed at the vehicle starting time can be prevented from drifting upwards, the smoothness at the vehicle starting time is improved, and the driving comfort of the vehicle is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
FIG. 1 is a flow chart of a method of limiting engine torque when a vehicle is launched in accordance with one embodiment of the present application;
FIG. 2 is a flow chart of a method of limiting engine torque when a vehicle is launched, according to an embodiment of the application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
FIG. 1 is a flow chart of a method of limiting engine torque when a vehicle is launched in accordance with one embodiment of the present application. Taking a TCU (Transmission Control Unit ) to which the method is applied in a vehicle as an example, referring to fig. 1, the engine torque limiting method at the time of starting the vehicle includes the steps of:
step S1, determining a current gear of the vehicle and determining a current clutch pressure value.
Specifically, a gear command sent by a gear selection lever or a gear selection control key may be received by the TCU via a CAN (Controller Area Network ) to determine a current gear, and a pressure value sent by a pressure sensor on the clutch to determine a current clutch pressure value.
Step S2, determining an engine torque gradient value according to the current gear and the current clutch pressure value.
Specifically, the corresponding engine torque gradient value may be determined by the TCU based on the current gear and the current clutch pressure value by querying a gear-pressure-engine torque gradient value table stored in memory.
Optionally, in some embodiments of the application, determining the engine torque gradient value from the current gear and the current clutch pressure value comprises: determining a first engine torque gradient value corresponding to a current gear when the current clutch pressure value is above a clutch transfer torque point; and determining a second engine torque gradient value corresponding to the current gear when the current clutch pressure value is below the clutch transmission torque point, wherein the second engine torque gradient value is greater than the first engine torque gradient value.
Specifically, when the current clutch pressure value is above a clutch transmission torque point, indicating that the clutch is not in an idle stroke, inquiring an engine torque gradient value stored in a memory according to the current gear and the current clutch pressure value, and determining a first engine torque gradient value; and when the current clutch pressure value is below the clutch transmission torque point, the clutch is in idle stroke, and the engine torque gradient value stored in the memory is queried according to the current gear and the current clutch pressure value to determine a second engine torque gradient value.
And S3, limiting the output torque of the engine according to the engine torque gradient value.
For example, the TCU sends an engine torque gradient value to the engine controller via the CAN network, the engine controller calculates based on the received engine torque gradient value, determines a net torque signal for the clutch, and sends feedback information to the TCU to cause the TCU to determine that the engine controller received the engine torque gradient value. The engine controller also controls the output torque of the engine based on the engine torque gradient value.
It can be appreciated that in practical applications, when the vehicle is equipped with a DCT (Dual Clutch Transmission, dual clutch automatic transmission), by controlling the output torque of the engine, the torque of the dual mass flywheel and the torque of the clutch output can be controlled, thereby controlling the smooth start of the vehicle and improving the user experience. And the rotating speed of the flywheel is detected by a sensor arranged on the dual-mass flywheel, and the starting condition of the vehicle is displayed by a pointer of an instrument panel.
Therefore, the current gear and the current clutch pressure value of the vehicle are determined, the engine torque gradient value is determined according to the current gear and the clutch pressure value, and the output torque of the engine is limited according to the engine torque gradient value, namely, the engine is limited in different gradients based on different gears and different clutch pressure intervals, so that the engine speed can be prevented from drifting upwards when the vehicle starts, the smoothness when the vehicle starts is improved, and the driving comfort of the vehicle is improved.
Further, in some embodiments of the application, the vehicle comprises a first starting gear and a second starting gear, the first starting gear corresponding to an engine torque gradient value different from the second starting gear corresponding to an engine torque gradient value when the first starting gear and the second starting gear are in the same clutch.
It should be noted that the speed ratios of the different starting gears are different, and the engine torques corresponding to the corresponding gears are also different, so that when the first starting gear and the second starting gear adopt the same clutch, the speed ratios corresponding to the different starting gears can be adapted by setting different engine torque gradient values, so that the vehicle starts steadily, and the user experience is improved.
In some embodiments of the application, when the first starting gear is a forward gear and the second starting gear is a reverse gear, the engine torque gradient value corresponding to the first starting gear is greater than the engine torque gradient value corresponding to the second starting gear.
It will be appreciated that in practice the ratio of the reverse gear is lower than that of the forward gear and that in order to prevent the engine from drifting up the speed of the engine, it is necessary to reduce the corresponding engine torque gradient value in order to allow the vehicle to start smoothly, so that when the first starting gear is the forward gear and the second starting gear is the reverse gear, the engine torque gradient value corresponding to the first starting gear is greater than that corresponding to the second starting gear.
In some embodiments of the present application, the first engine torque gradient value for the first gear is 170-300Nm/s and the second engine torque gradient value for the first gear is 500-2000Nm/s; the second starting gear corresponds to a first engine torque gradient of 100-150Nm/s and the first starting gear corresponds to a second engine torque gradient of 150-200Nm/s.
Specifically, when the current gear is determined to be a first starting gear and the current clutch pressure value is above the clutch transmission torque point, the TCU sends a first engine torque gradient value to the motor controller, wherein the sent first engine torque gradient value is gradually increased in a range of 170-300 Nm/s; when the current gear is determined to be the first starting gear and the current clutch pressure value is below the clutch transfer torque point, the TCU sends a second engine torque gradient value to the motor controller, wherein the sent second engine torque gradient value is gradually increased in the range of 500-2000 Nm/s. Therefore, when the current gear is determined to be the first starting gear, if the current pressure is below a clutch transmission torque point, the maximum engine torque gradient is requested, namely the engine torque is not limited, and if the current pressure is above the clutch transmission torque point, the minimum engine torque gradient is requested, namely the engine torque is limited, so that the problem that the power response of the vehicle is influenced when the first starting gear and the second starting gear adopt the same clutch and the vehicle starts in the first starting gear is solved, and good smoothness and response are obtained. When the first starting gear and the second starting gear are the same clutch, the TCU transmits the same engine torque gradient limit value to limit the engine speed, and the corresponding engine torque maps are different due to the different speed ratios corresponding to the different starting gears, so that when the vehicle starts with the first starting gear, the limit value of the engine torque gradient will be reduced to give consideration to the smoothness of the different gears, and the power response of the vehicle in the starting gear will be affected.
When the current gear is determined to be a second starting gear and the current clutch pressure value is above a clutch transmission torque point, the TCU sends a first engine torque gradient value to the motor controller, wherein the sent first engine torque gradient value gradually increases in a range of 100-150 Nm/s; when the current gear is determined to be the second starting gear and the current clutch pressure value is below the clutch transfer torque point, the TCU sends a second engine torque gradient value to the motor controller, wherein the sent second engine torque gradient value is gradually increased in the range of 150-200Nm/s. Therefore, when the current gear is determined to be the second starting gear, if the current pressure is below the clutch transmission torque point, the smaller engine torque gradient conforming to the second starting performance is requested to be limited, and if the current pressure is above the clutch transmission torque point, the larger engine torque gradient conforming to the second starting gear is requested to be limited, so that good smoothness and responsiveness are obtained. When the first starting gear and the second starting gear adopt the same clutch, the TCU transmits the same engine torque gradient limit value to limit the engine speed, and the corresponding engine torque maps are different due to different speed ratios corresponding to different starting gears, when the second starting gear starts, if the engine torque gradient value at the moment is adapted to the first starting gear, the clutch will drift upwards in the combining process, so that the driving comfort of the vehicle is affected.
It can be understood that the control strategy of the application is to limit the output torque of the engine in different starting gears by adopting the gradient value of the engine with big engine and small engine and ensure the smoothness and dynamic property in the starting process of the vehicle.
In some embodiments of the application, the method further comprises, prior to limiting the output torque of the engine according to the engine torque gradient value: determining a current driving mode of the vehicle; the engine torque gradient value is adjusted according to the current driving mode.
For example, the ECU (Electronic Control Unit ) may receive the current driving mode command sent by the central control screen and send the driving mode command to the TCU, which adjusts the engine torque gradient value according to the received driving mode command.
Further, when the current driving mode is the sport mode, the engine torque gradient value is subjected to strengthening limitation; when the current driving mode is the economy mode, the engine torque gradient value is subjected to a reduction restriction. By enhancing the engine torque gradient value in the sport mode, the starting time of the vehicle is shortened, the drivability of a user is improved, and by reducing the engine torque gradient value in the economy mode, the starting fuel consumption of the vehicle is reduced. Wherein the engine torque gradient values include a first engine torque gradient value and a second engine torque gradient value.
Therefore, the current gear and the current clutch pressure value of the vehicle are determined, the engine torque gradient value is determined according to the current gear and the clutch pressure value, the engine torque gradient value is reinforced or reduced and limited according to the current driving mode, and the output torque of the engine is limited according to the engine torque gradient value, so that the engine speed can be prevented from drifting upwards when the vehicle starts, the smoothness when the vehicle starts is improved, the driving comfort of the vehicle is improved, and the driving performance of the vehicle is improved.
To facilitate an understanding of the present application by those skilled in the art, referring to FIG. 2, the present application also provides a specific embodiment of a method for limiting engine torque when a vehicle is launched.
In step S21, the vehicle starts and an input signal of the accelerator pedal is detected.
Step S22, determining an engine torque gradient value according to the current gear of the vehicle and the current clutch pressure value.
Specifically, the TCU sends a first engine torque gradient value (170-300 Nm/s) to the motor controller when the current gear is determined to be the first starting gear and the current clutch pressure value is above the clutch transfer torque point. The TCU sends a second engine torque gradient value (500-2000 Nm/s) to the motor controller when the current gear is determined to be the first starting gear and the current clutch pressure value is below the clutch transfer torque point. The TCU sends a first engine torque gradient value (100-150 Nm/s) to the motor controller when the current gear is determined to be the second starting gear and the current clutch pressure value is above the clutch transfer torque point. The TCU sends a second engine torque gradient value (150-200 Nm/s) to the motor controller when the current gear is determined to be the second starting gear and the current clutch pressure value is below the clutch transfer torque point.
Step S23, determining a current driving mode of the vehicle, and adjusting the engine torque gradient value according to the current driving mode.
Specifically, when the current driving mode is determined to be a sport mode, the engine torque gradient value is subjected to reinforcement limitation; when the current driving mode is determined to be the economy mode, the engine torque gradient value is subjected to a reduction restriction.
Step S24, limiting the output torque of the engine according to the engine torque gradient value.
In summary, according to the method for limiting the engine torque when the vehicle starts, the corresponding engine torque gradient value is determined by determining the current gear of the vehicle and the magnitude relation between the current clutch pressure value and the clutch transmission torque point, the engine torque gradient value is regulated by determining the current mode of the vehicle, and the output torque of the engine is limited according to the regulated engine torque gradient value, so that the engine speed can be prevented from drifting upwards when the vehicle starts, the smoothness when the vehicle starts is improved, and the user experience is improved.
Corresponding to the above embodiment, the present application also provides a computer readable storage medium having stored thereon a vehicle start-time engine torque limiting program, which when executed by a processor, implements the vehicle start-time engine torque limiting method described in the above embodiment.
According to the computer readable storage medium, when the stored vehicle starting engine torque limiting program is executed by the processor, the output torque of the engine is limited according to the engine torque gradient value by executing the vehicle starting engine torque limiting program, so that the engine speed can be prevented from drifting upwards when the vehicle is started, the smoothness when the vehicle is started is improved, and the user experience is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, as used in embodiments of the present application, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying any particular number of features in the present embodiment. Thus, a feature of an embodiment of the application that is defined by terms such as "first," "second," etc., may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present application, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly defined otherwise in the embodiments.
In the present application, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific embodiments.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (7)
1. A method for limiting engine torque when a vehicle starts, comprising:
determining a current gear of the vehicle and determining a current clutch pressure value;
determining an engine torque gradient value based on the current gear and the current clutch pressure value;
limiting the output torque of the engine according to the engine torque gradient value;
determining an engine torque gradient value from the current gear and the current clutch pressure value, comprising:
determining a first engine torque gradient value corresponding to the current gear when the current clutch pressure value is above a clutch transfer torque point;
and determining a second engine torque gradient value corresponding to the current gear when the current clutch pressure value is below a clutch transmission torque point, wherein the second engine torque gradient value is larger than the first engine torque gradient value.
2. The vehicle launch engine torque limiting method of claim 1, wherein prior to limiting the output torque of the engine in accordance with the engine torque gradient value, the method further comprises:
determining a current driving mode of the vehicle;
and adjusting the engine torque gradient value according to the current driving mode.
3. The method of limiting engine torque at vehicle launch according to claim 2 wherein adjusting the engine torque gradient value according to the current driving mode comprises:
when the current driving mode is a sport mode, the engine torque gradient value is subjected to reinforcement limitation;
and when the current driving mode is an economy mode, performing reduction limitation on the engine torque gradient value.
4. Method for limiting the torque of an engine when starting a vehicle according to claim 1, characterized in that the vehicle comprises a first starting gear and a second starting gear, the first starting gear corresponding to an engine torque gradient value being different from the second starting gear corresponding to an engine torque gradient value when the first starting gear and the second starting gear are in the same clutch.
5. The method according to claim 4, characterized in that the engine torque gradient value corresponding to the first starting gear is larger than the engine torque gradient value corresponding to the second starting gear when the first starting gear is a forward gear and the second starting gear is a reverse gear.
6. The method of limiting engine torque at vehicle launch according to claim 5 wherein said first gear corresponds to a first engine torque gradient of 170 Nm/s to 300Nm/s and said first gear corresponds to a second engine torque gradient of 500 Nm/s to 2000Nm/s; the second starting gear corresponds to a first engine torque gradient value of 100-150Nm/s and the first starting gear corresponds to a second engine torque gradient value of 150-200Nm/s.
7. A computer-readable storage medium, characterized in that a vehicle start-time engine torque limiting program is stored thereon, which when executed by a processor implements the vehicle start-time engine torque limiting method according to any one of claims 1-6.
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| US6366843B1 (en) * | 1998-12-07 | 2002-04-02 | Zf Friedrichshafen Ag | Method for controlling an automatic transmission |
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| CN113323761A (en) * | 2021-06-23 | 2021-08-31 | 蜂巢传动科技河北有限公司 | Vehicle engine starting and stopping method and device and vehicle |
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| JP2003301733A (en) * | 2002-03-28 | 2003-10-24 | Robert Bosch Gmbh | Driving slip control device and method |
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| US6366843B1 (en) * | 1998-12-07 | 2002-04-02 | Zf Friedrichshafen Ag | Method for controlling an automatic transmission |
| JP2003003893A (en) * | 2001-06-25 | 2003-01-08 | Mitsubishi Motors Corp | Output control device for engine |
| CN105644562A (en) * | 2016-02-25 | 2016-06-08 | 安徽江淮汽车股份有限公司 | Double-clutch automatic transmission creeping control method |
| CN110094496A (en) * | 2018-01-31 | 2019-08-06 | 长城汽车股份有限公司 | A kind of torque control method, device and vehicle |
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