CN114312730A - Engine torque limiting method and computer readable storage medium for vehicle starting - Google Patents
Engine torque limiting method and computer readable storage medium for vehicle starting Download PDFInfo
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Abstract
The invention discloses a method for limiting engine torque during vehicle starting and a computer readable storage medium, wherein the method for limiting the engine torque during vehicle starting comprises the following steps: determining the current gear of the vehicle and determining the current clutch pressure value; determining an engine torque gradient value according to the current gear and the current clutch pressure value; and limiting the output torque of the engine according to the engine torque gradient value. Therefore, the engine speed can be prevented from floating upwards when the vehicle starts, the smoothness of the vehicle when the vehicle starts is improved, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method for limiting engine torque when a vehicle starts and a computer-readable storage medium.
Background
For the current vehicle with a dual clutch transmission, because different gears share one clutch, for example, one gear and an R gear (reverse gear) share one clutch, when the vehicle starts in the R gear, the engine torque rises faster than the clutch engagement speed, so that the engine speed floats, and the driving comfort of the vehicle is affected.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a method for limiting engine torque when a vehicle starts, in which an engine torque gradient value is determined according to a current gear and a clutch pressure value when the vehicle starts, an output torque of an engine is limited according to the engine torque gradient value, thereby preventing an engine speed from drifting when the vehicle starts, improving smoothness when the vehicle starts, and improving driving comfort of the vehicle.
A second object of the invention is to propose a computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for limiting engine torque when a vehicle is started, the method comprising: determining the current gear of the vehicle and determining the current clutch pressure value; determining an engine torque gradient value according to the current gear and the current clutch pressure value; and limiting the output torque of the engine according to the engine torque gradient value.
According to the method for limiting the engine torque during vehicle starting, disclosed by the embodiment of the invention, the engine rotating speed can be prevented from floating when the vehicle is started by determining the current gear and the current clutch pressure value of the vehicle, determining the engine torque gradient value according to the current gear and the clutch pressure value and limiting the output torque of the engine according to the engine torque gradient value, so that the smoothness of the vehicle during starting is improved, and the driving comfort of the vehicle is improved.
In addition, according to the engine torque limiting method at the time of vehicle start of the above embodiment of the present invention, the following additional features may be further provided:
according to one embodiment of the invention, determining an engine torque gradient value based on a current gear and a current clutch pressure value comprises: when the current clutch pressure value is above the clutch transmission torque point, determining a first engine torque gradient value corresponding to the current gear; and when the current clutch pressure value is below the clutch transmission torque point, determining a second engine torque gradient value corresponding to the current gear, wherein the second engine torque gradient value is larger than the first engine torque gradient value.
According to an embodiment of the invention, 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 present invention, adjusting the engine torque gradient value according to the current driving mode comprises: when the current driving mode is the motion mode, strengthening and limiting the torque gradient value of the engine; when the current driving mode is the economy mode, a reduction limit is imposed on the engine torque gradient value.
According to one embodiment of the invention, the vehicle comprises a first starting gear and a second starting gear, and when the same clutch is used for the first starting gear and the second starting gear, the gradient value of the engine torque corresponding to the first starting gear is different from the gradient value of the engine torque corresponding to the second starting gear.
According to one embodiment of the present invention, 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 larger than the engine torque gradient value corresponding to the second starting gear.
According to one embodiment of the invention, the first engine torque gradient value corresponding to the first starting gear is 170-300Nm/s, and the second engine torque gradient value corresponding to the first starting gear is 500-2000 Nm/s; the first engine torque gradient value corresponding to the second starting gear is 100-150Nm/s, and the second engine torque gradient value corresponding to the first starting gear is 150-200 Nm/s.
In order to achieve the above object, a second aspect of the present invention 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 embodiments.
According to the computer-readable storage medium of the embodiment of the invention, when the stored engine torque limiting program is executed by the processor when the vehicle starts, the engine torque limiting program is executed when the vehicle starts, 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 floating when the vehicle starts, the smoothness of the vehicle when the vehicle starts is improved, and the driving comfort of the vehicle is improved.
Additional aspects and advantages of the invention 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 invention.
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FIG. 1 is a flow chart of a method of engine torque limiting at vehicle launch according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method of engine torque limiting during vehicle launch in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of a method of engine torque limiting during vehicle launch in accordance with one embodiment of the present invention. Taking a TCU (Transmission Control Unit) applied to a vehicle as an example, referring to fig. 1, the method for limiting the engine torque when the vehicle starts includes the following steps:
and step S1, determining the current gear of the vehicle and determining the current clutch pressure value.
Specifically, a TCU may receive a gear command sent by a gear selection lever or a gear selection control key through a CAN (Controller Area Network) to determine a current gear, and receive a pressure value sent by a pressure sensor on the clutch to determine a current clutch pressure value.
And 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 current clutch pressure values by consulting a gear-pressure-engine torque gradient value table stored in memory.
Optionally, in some embodiments of the present invention, determining the engine torque gradient value based on the current gear and the current clutch pressure value comprises: when the current clutch pressure value is above the clutch transmission torque point, determining a first engine torque gradient value corresponding to the current gear; and when the current clutch pressure value is below the clutch transmission torque point, determining a second engine torque gradient value corresponding to the current gear, wherein the second engine torque gradient value is larger than the first engine torque gradient value.
Specifically, when the current clutch pressure value is above the clutch transmission torque point, the clutch is not in the idle stroke, the engine torque gradient value stored in the memory is inquired according to the current gear and the current clutch pressure value, and the first engine torque gradient value is determined; and when the current clutch pressure value is below the clutch transmission torque point, the clutch is in the idle stroke, and the engine torque gradient value stored in the memory is inquired according to the current gear and the current clutch pressure value to determine a second engine torque gradient value.
In step S3, the output torque of the engine is limited 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, and the engine controller performs calculations based on the received engine torque gradient value, determines a net torque signal for the clutch, and sends feedback information to the TCU to enable the TCU to determine that the engine torque gradient value was received by the engine controller. The engine controller also controls an output torque of the engine according to the engine torque gradient value.
It can be understood that, in practical applications, when a vehicle is equipped with a DCT (Dual Clutch Transmission), the torque of the Dual mass flywheel and the torque output by the Clutch can be controlled by controlling the output torque of the engine, so as to control the vehicle to start smoothly, thereby improving 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, 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 gear and different clutch pressure intervals, the rotating speed of the engine can be prevented from floating when the vehicle starts, the smoothness of the vehicle when the vehicle starts is improved, and the driving comfort of the vehicle is improved.
Further, in some embodiments of the invention, the vehicle comprises a first starting gear and a second starting gear, and when the same clutch is used for the first starting gear and the second starting gear, the gradient value of the engine torque corresponding to the first starting gear is different from the gradient value of the engine torque corresponding to the second starting gear.
It should be noted that the speed ratios of 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 stably, and the user experience is improved.
In some embodiments of the invention, 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 larger than the engine torque gradient value corresponding to the second starting gear.
It can be understood that, in practical applications, the speed of the reverse gear is lower than that of the forward gear, and in order to prevent the rotation speed of the engine from drifting, the corresponding engine torque gradient value needs to be reduced to enable 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 larger than the engine torque gradient value corresponding to the second starting gear.
In some embodiments of the present invention, the first engine torque gradient value corresponding to the first starting gear is 170-; the first engine torque gradient value corresponding to the second starting gear is 100-150Nm/s, and the second engine torque gradient value corresponding to the first starting gear is 150-200 Nm/s.
Specifically, when the current gear is determined to be a first 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 within the range of 170 and 300 Nm/s; upon determining that the current gear is the first starting gear and that 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 within 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 the 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. It should be noted that, when the same clutch is used in the first starting gear and the second starting gear, the TCU sends the same engine torque gradient limit value to limit the engine speed, and since the speed ratios corresponding to the different starting gears are different and the corresponding engine torque maps are also different, when the vehicle starts in the first starting gear, the limit value of the engine torque gradient is adjusted to be smaller in order to take account of the smoothness of the different gears, and at this time, the power response of the vehicle in the starting gear is affected.
When the current gear is determined to be a second 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 gradually increases within the range of 100 and 150 Nm/s; and when the current gear is determined to be the second starting gear and the current clutch pressure value is below the clutch transmission 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 within the range of 150 and 200 Nm/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 which accords with the second starting performance is requested to be limited, and if the current pressure is above the clutch transmission torque point, the larger limitation is performed on the engine torque which accords with the second starting gear, so that the good smoothness and the good responsiveness are obtained. It should be noted that, when the same clutch is used in the first starting gear and the second starting gear, the TCU sends the same engine torque gradient limit value to limit the engine speed, and since the speed ratios corresponding to the different starting gears are different, the corresponding engine torque maps are also different, when the second starting gear is started, if the engine torque gradient value at this time is adapted to the first starting gear, the clutch may float upward during the combining process, which affects the driving comfort of the vehicle.
It can be understood that the control strategy of the invention is to limit the output torque of the engine in different starting gears by using the first-large and last-small engine gradient values so as to ensure the smoothness and dynamic property of the vehicle in the starting process.
In some embodiments of the invention, 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.
For example, an ECU (Electronic Control Unit) may receive a current driving mode command sent by the central Control screen and send the driving mode command to the TCU, and the TCU adjusts the engine torque gradient value according to the received driving mode command.
Further, when the current driving mode is the motion mode, strengthening and limiting the gradient value of the engine torque; when the current driving mode is the economy mode, a reduction limit is imposed on the engine torque gradient value. The starting time of the vehicle is shortened and the drivability of a user is improved by enhancing the torque gradient value of the engine in the motion mode, and the starting oil consumption of the vehicle is reduced by reducing the torque gradient value of the engine in the economy mode. 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 current driving mode is combined, the engine torque gradient value is strengthened or reduced and limited, the output torque of the engine is limited according to the engine torque gradient value, the engine rotating speed can be prevented from floating 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 understanding of the present application by those skilled in the art, reference is made to FIG. 2, which shows an embodiment of a method for limiting engine torque during vehicle launch.
In step S21, the vehicle is started and an input signal of an accelerator pedal is detected.
And step S22, determining an engine torque gradient value according to the current gear of the vehicle and the current clutch pressure value.
Specifically, upon determining that the current gear is the first launch gear and that the current clutch pressure value is above the clutch transfer torque point, the TCU sends a first engine torque gradient value (170) 300Nm/s to the motor controller. Upon determining that the current gear is the first launch gear and that the current clutch pressure value is below the clutch transfer torque point, the TCU sends a second engine torque gradient value (500-. When the current gear is determined to be the second starting gear and the current clutch pressure value is above the clutch transmission torque point, the TCU sends the first engine torque gradient value (100 and 150Nm/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 transmission torque point, the TCU sends a second engine torque gradient value (150-.
And step S23, determining the 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 the motion mode, strengthening and limiting the engine torque gradient value; when the current driving mode is determined to be the economy mode, a reduction limit is applied to the engine torque gradient value.
In step S24, the output torque of the engine is limited according to the engine torque gradient value.
In summary, according to the engine torque limiting method for vehicle starting provided by the invention, 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 torque transmission point, the engine torque gradient value is adjusted by determining the current mode of the vehicle, and the output torque of the engine is limited according to the adjusted engine torque gradient value, so that the engine speed can be prevented from drifting when the vehicle is started, the smoothness of the vehicle when the vehicle is started is improved, and the user experience is improved.
In correspondence with the above-described embodiment, the present invention also proposes a computer-readable storage medium having stored thereon a vehicle start-time engine torque restriction program that, when executed by a processor, implements the vehicle start-time engine torque restriction method described in the above-described embodiment.
According to the computer-readable storage medium of the embodiment of the invention, when the stored engine torque limiting program is executed by the processor when the vehicle starts, the engine torque limiting program is executed when the vehicle starts, 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 floating when the vehicle starts, the smoothness of the vehicle when the vehicle starts 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, such as an ordered listing of executable instructions that can be considered to implement logical functions, can 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). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second", and the like used in the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the embodiments. Thus, a feature of an embodiment of the present invention that is defined by the terms "first," "second," etc. may explicitly or implicitly indicate that at least one of the feature is included in the embodiment. In the description of the present invention, the word "plurality" means at least two or two and more, such as two, three, four, etc., unless specifically limited otherwise in the examples.
In the present invention, unless otherwise explicitly stated or limited by the relevant description or limitation, the terms "mounted," "connected," and "fixed" in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. Those of ordinary skill in the art will understand the specific meaning of the above terms in the present invention according to their specific implementation.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A method of limiting engine torque at vehicle launch, comprising:
determining the current gear of the vehicle and determining the current clutch pressure value;
determining an engine torque gradient value according to the current gear and the current clutch pressure value;
and limiting the output torque of the engine according to the engine torque gradient value.
2. The method of claim 1, wherein determining an engine torque gradient value based on the current gear and the current clutch pressure value comprises:
when the current clutch pressure value is above a clutch transmission torque point, determining a first engine torque gradient value corresponding to the current gear;
and when the current clutch pressure value is below a clutch transmission torque point, determining a second engine torque gradient value corresponding to the current gear, wherein the second engine torque gradient value is larger than the first engine torque gradient value.
3. The engine torque limiting method at the time of vehicle startup according to claim 1 or 2, characterized in that 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;
adjusting the engine torque gradient value according to the current driving mode.
4. The method of claim 3, wherein adjusting the engine torque gradient value as a function of the current driving mode comprises:
when the current driving mode is a motion mode, performing reinforced limitation on the engine torque gradient value;
and when the current driving mode is the economy mode, performing reduction limitation on the engine torque gradient value.
5. The method for limiting engine torque at vehicle startup as claimed in claim 1 or 2, characterized in that the vehicle comprises a first startup gear and a second startup gear, and when the same clutch is used for the first startup gear and the second startup gear, the engine torque gradient value corresponding to the first startup gear is different from the engine torque gradient value corresponding to the second startup gear.
6. The method for limiting engine torque at startup of a vehicle according to claim 5, wherein 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 larger than the engine torque gradient value corresponding to the second starting gear.
7. The vehicle startup engine torque limiting method as recited in claim 6, characterized in that the first engine torque gradient value corresponding to said first starting gear is 170-300Nm/s, and the second engine torque gradient value corresponding to said first starting gear is 500-2000 Nm/s; the first engine torque gradient value corresponding to the second starting gear is 100-150Nm/s, and the second engine torque gradient value corresponding to the first starting gear is 150-200 Nm/s.
8. A computer-readable storage medium, characterized in that a vehicle startup engine torque limiting program is stored thereon, which when executed by a processor implements the vehicle startup engine torque limiting method according to any one of claims 1 to 7.
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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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| 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 |
| US20030209377A1 (en) * | 2002-03-28 | 2003-11-13 | Thomas Sauter | Reduction in TCS control frequency when cornering on a road surface having a low coefficient of friction |
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