Engine speed control method, control system, vehicle and storage medium for a hybrid vehicle

Abstract

This invention discloses a method for controlling engine speed in a hybrid vehicle, comprising: during vehicle operation, when shifting conditions are met, performing a shift operation; the vehicle controller sending a control command to the engine controller to control the actual engine speed; completing the shift action; and the engine controller controlling the engine's output torque to meet set conditions. This method for controlling engine speed in a hybrid vehicle requires no changes to components, adds no new components or controllers, and only optimizes existing controller software strategies to solve the problem of abnormally high engine speed, achieving reasonable control of engine speed. This ensures that the engine speed is kept within a reasonable range during shifting, preventing abnormal increases or runaway speeds due to clutch disengagement, avoiding excessive engine noise and fuel consumption, eliminating vehicle jerking during shifting, and maintaining the same overall vehicle cost with a short implementation cycle. This invention also discloses a hybrid vehicle engine speed control system, a vehicle, and a computer-readable storage medium.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology. Specifically, this invention relates to a method for controlling engine speed in a hybrid vehicle, a control system, a vehicle, and a storage medium. Background Technology

[0002] With the development and widespread adoption of hybrid vehicles, a series of issues arising during their actual use have attracted widespread attention.

[0003] In existing 2DHT / 3DHT hybrid models, during vehicle operation, when the transmission shifts gears and the engine is still running, the clutch disengages for about 2 seconds, and the gear is in neutral. With no engine load, this can easily lead to abnormally high engine speeds or even runaway acceleration. Subjectively, this results in noticeable abnormal noises from the front compartment, accompanied by increased fuel consumption. Therefore, this causes problems such as loud engine noise, high fuel consumption, and vehicle jerking.

[0004] The aim is to provide an improved method for controlling engine speed in hybrid vehicles, particularly addressing the issue of abnormally high engine speeds. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for controlling engine speed in hybrid vehicles, with the purpose of achieving reasonable control of engine speed.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a hybrid vehicle engine speed control method, comprising:

[0007] When the conditions for shifting are met during vehicle operation, a shifting operation is performed.

[0008] The vehicle controller sends control commands to the engine controller to control the actual engine speed.

[0009] Complete the gear shifting action;

[0010] The engine controller ensures that the engine's output torque meets the set conditions.

[0011] The shift condition is that the vehicle controller sends a shift request to the transmission controller.

[0012] After the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage.

[0013] The vehicle controller sends control commands to the engine controller, including a speed control flag and a target speed. The engine controller then controls the engine's actual speed to follow the target speed.

[0014] The engine controller controls the engine's actual speed to follow the target speed by controlling the engine's throttle opening.

[0015] The set conditions include that the engine output torque is not greater than the engine reverse torque.

[0016] After the gear shift is completed, the clutch engages, the speed control requests disengagement, and the engine controller responds to the torque control, controlling the output torque of the engine.

[0017] The present invention also provides a hybrid vehicle engine speed control system, including a vehicle controller, an engine controller, and a transmission controller. The vehicle controller is configured to send control commands to the engine controller and shift requests to the transmission controller. The engine controller is configured to control the actual engine speed and control the engine output torque to meet set conditions.

[0018] The present invention also provides a vehicle including the aforementioned hybrid vehicle engine speed control system.

[0019] The present invention also provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the hybrid vehicle engine speed control method described above.

[0020] The hybrid vehicle engine speed control method of the present invention requires no changes to components, no addition of other components or controllers, and only optimizes the existing controller software strategy to solve the problem of abnormal engine speed increase, so as to achieve reasonable control of engine speed. During the gear shifting process, the engine speed is controlled within a reasonable range, and there will be no abnormal increase or runaway due to clutch disengagement. It avoids the problem of excessive engine noise and high fuel consumption, and there is no jerking problem in the whole vehicle during gear shifting. Moreover, the overall vehicle cost is not increased and the implementation cycle is short. Attached Figure Description

[0021] Figure 1 This is a flowchart of the hybrid vehicle engine speed control method of the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] This invention provides a method for controlling engine speed in hybrid vehicles, which keeps the engine speed within a reasonable range during gear shifting, preventing abnormal increases or runaway speeds due to clutch disengagement.

[0025] To solve the aforementioned technical problems, the present invention adopts the following solution:

[0026] 1. The system involved in the method is controlled by the transmission controller (TCU) to disengage the clutch upon receiving a request from the vehicle controller (HCU);

[0027] 2. The engine control system (EMS) receives the speed control request and target speed from the vehicle control unit (HCU), and requests that the torque be no greater than the engine's reverse torque;

[0028] 3. After receiving the speed control request and the target speed, the engine control system (EMS) controls the throttle opening to make the actual engine speed follow the target speed.

[0029] 4. After shifting gears, the clutch engages, the speed control requests disengagement, and the engine control system (EMS) responds to the torque control, controlling the engine torque.

[0030] Specifically, the present invention provides a method for controlling the engine speed of a hybrid vehicle, comprising:

[0031] When the conditions for shifting are met during vehicle operation, a shifting operation is performed.

[0032] The vehicle controller sends control commands to the engine controller to control the actual engine speed.

[0033] Complete the gear shifting action;

[0034] The engine controller ensures that the engine's output torque meets the set conditions.

[0035] The shift condition is that the vehicle controller sends a shift request to the transmission controller.

[0036] After the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage.

[0037] The vehicle controller sends control commands to the engine controller, including a speed control flag and a target speed. The engine controller then controls the engine's actual speed to follow the target speed.

[0038] The engine controller controls the engine's actual speed to follow the target speed by controlling the engine's throttle opening.

[0039] The set conditions include that the engine output torque is not greater than the engine reverse torque.

[0040] After the gear shift is completed, the clutch engages, the speed control requests disengagement, and the engine controller responds to the torque control, controlling the output torque of the engine.

[0041] The present invention also provides a hybrid vehicle engine speed control system, including a vehicle controller, an engine controller, and a transmission controller. The vehicle controller is configured to send control commands to the engine controller and shift requests to the transmission controller. The engine controller is configured to control the actual engine speed and control the engine output torque to meet set conditions.

[0042] The present invention also provides a vehicle including the aforementioned hybrid vehicle engine speed control system.

[0043] The present invention also provides a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the hybrid vehicle engine speed control method described above.

[0044] Example

[0045] Firstly, such as Figure 1 As shown, this embodiment of the invention provides a method for controlling the engine speed of a hybrid vehicle, including the following steps:

[0046] S1. When the shifting conditions are met during vehicle operation, perform the shifting operation;

[0047] S2. The vehicle controller sends control commands to the engine controller to control the actual speed of the engine.

[0048] S3, complete the gear shifting action;

[0049] S4. The engine controller controls the engine's output torque to meet the set conditions.

[0050] Specifically, such as Figure 1 As shown, in step S1 above, the shift condition is that the vehicle controller (HCU) sends a shift request to the transmission controller (TCU), and the transmission controller controls the engagement and disengagement of the clutch.

[0051] like Figure 1 As shown, in step S1 above, after the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage. The clutch is located between the engine and the transmission; when the clutch is disengaged, the engine's power cannot be transmitted to the transmission.

[0052] like Figure 1 As shown, in step S2 above, the control command sent by the vehicle controller to the engine controller (EMS) includes controlling the engine speed control flag and the target speed. After receiving the control command from the vehicle controller, the engine controller controls the actual engine speed to follow the target speed, keeping the engine speed within a reasonable range and preventing abnormal speed increases or runaway problems due to clutch disengagement.

[0053] like Figure 1 As shown, in step S2 above, after receiving the speed control request and the target speed, the engine controller controls the engine's actual speed to follow the target speed by controlling the engine's throttle opening. By controlling the engine speed, the engine controller responds to the target speed sent by the vehicle controller, thus achieving reasonable control of the engine speed.

[0054] like Figure 1 As shown, in step S3 above, the transmission controller completes the shifting action and controls the clutch to be engaged, so that the engine power can be transmitted to the transmission.

[0055] like Figure 1 As shown, in step S4 above, the set conditions include the engine output torque not exceeding the engine drag torque at this time. After shifting gears, the clutch engages, the speed control requests disengagement, and the engine controller responds to the torque control, controlling the engine output torque to ensure it does not exceed the engine drag torque at this time. This can optimize the engine's operating speed range to a certain extent, bringing it closer to the optimal fuel economy range. Furthermore, by controlling the output torque to not exceed the drag torque, it can ensure driving performance while avoiding the adverse effects of excessive torque output on the vehicle, improving shift smoothness and enhancing the driving experience. Stable torque output helps maintain stable engine operation, reducing malfunctions and damage caused by sudden load changes.

[0056] In a second aspect, embodiments of the present invention also provide a hybrid vehicle engine speed control system for implementing a hybrid vehicle engine speed control method, comprising a vehicle controller, an engine controller, and a transmission controller, wherein the engine controller and the transmission controller are electrically connected to the vehicle controller. The vehicle controller is configured to send control commands to the engine controller and shift requests to the transmission controller, and the engine controller is configured to control the actual engine speed and control the engine output torque to meet set conditions.

[0057] During vehicle operation, after the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage, and the engine's power cannot be transmitted to the transmission.

[0058] After the clutch is switched to the disengaged state, the engine controller receives the control command from the vehicle controller. The engine controller controls the actual speed of the engine to follow the target speed, keeping the engine speed within a reasonable range, so that there will be no abnormal increase in speed or runaway due to the clutch disengaging.

[0059] The transmission controller completes the gear shifting action, controlling the clutch to be engaged so that the engine's power can be transmitted to the transmission.

[0060] After the gear shift is completed, the clutch engages, the speed control requests disengagement, the engine controller responds to the torque control, and the engine controller controls the engine's output torque to ensure that the output torque does not exceed the engine's drag torque at this time.

[0061] In a third aspect, embodiments of the present invention also provide a vehicle including the aforementioned hybrid vehicle engine speed control system. The hybrid vehicle engine speed control system implements the aforementioned hybrid vehicle engine speed control method, which will not be described in detail here. Since the vehicle of this embodiment includes the hybrid vehicle engine speed control system described above, it possesses all the advantages of the aforementioned hybrid vehicle engine speed control system.

[0062] In this embodiment of the invention, the vehicle is a 2DHT hybrid model, and the transmission in the 2DHT hybrid model is a 2DHT transmission. The 2DHT transmission has two forward gears. Compared to traditional E-CVTs (continuously variable transmissions) or single-gear DHTs, it can optimize the operating points of the engine and electric motor under a wider range of operating conditions, improving fuel economy and power performance. Through more precise gear control, the 2DHT transmission can reduce engine speed when the vehicle is traveling at high speeds, thereby reducing fuel consumption and noise. Furthermore, the 2DHT transmission has high transmission efficiency, providing relatively strong power output.

[0063] In this embodiment of the invention, the vehicle can also be a 3DHT hybrid model, and the transmission of the 3DHT hybrid model is a 3DHT transmission. The 3DHT transmission has three forward gears. Compared to a 2DHT transmission, the 3DHT transmission offers more gear selection, enabling more precise power distribution and more efficient energy management under more complex operating conditions. Due to the increased number of gears, the 3DHT transmission can cover a wider speed range, thereby achieving more comprehensive optimization of power performance and fuel economy. The multi-gear design also makes power output smoother and more powerful.

[0064] In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions for causing a computer to execute a hybrid vehicle engine speed control method.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0067] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for controlling engine speed in a hybrid vehicle, characterized in that, include: S1. When the shifting conditions are met during vehicle operation, perform the shifting operation; S2. The vehicle controller sends control commands to the engine controller to control the actual speed of the engine. S3, complete the gear shifting action; S4. The engine controller controls the engine's output torque to meet the set conditions. In step S1, after the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage. The clutch is located between the engine and the transmission. After the clutch is disengaged, the engine's power cannot be transmitted to the transmission. In step S2, the control instructions sent by the vehicle controller to the engine controller include controlling the engine speed control flag and the target speed; after receiving the control instructions from the vehicle controller, the engine controller controls the actual speed of the engine to follow the target speed, keeping the engine speed within a reasonable range, so as not to cause abnormal speed increase or runaway due to clutch disengagement. In step S2, after receiving the speed control request and the target speed, the engine controller controls the engine's actual speed to follow the target speed by controlling the engine's throttle opening; the engine controller responds to the target speed sent by the vehicle controller by controlling the engine speed, thereby achieving reasonable control of the engine speed.

2. The hybrid vehicle engine speed control method according to claim 1, characterized in that, The shift condition is that the vehicle controller sends a shift request to the transmission controller.

3. The hybrid vehicle engine speed control method according to claim 2, characterized in that, After the vehicle controller sends a shift request to the transmission controller, the transmission controller controls the clutch to disengage.

4. The hybrid vehicle engine speed control method according to any one of claims 1 to 3, characterized in that, The vehicle controller sends control commands to the engine controller, including a speed control flag and a target speed. The engine controller then controls the engine's actual speed to follow the target speed.

5. The hybrid vehicle engine speed control method according to claim 4, characterized in that, The engine controller controls the engine's actual speed to follow the target speed by controlling the engine's throttle opening.

6. The hybrid vehicle engine speed control method according to any one of claims 1 to 3, characterized in that, The set conditions include that the engine output torque is not greater than the engine reverse torque.

7. The hybrid vehicle engine speed control method according to claim 6, characterized in that, After the gear shift is completed, the clutch engages, the speed control requests disengagement, and the engine controller responds to the torque control, controlling the output torque of the engine.

8. A hybrid vehicle engine speed control system implementing the hybrid vehicle engine speed control method according to any one of claims 1 to 7, characterized in that, It includes a vehicle controller, an engine controller, and a transmission controller. The vehicle controller is configured to send control commands to the engine controller and shift requests to the transmission controller. The engine controller is configured to control the actual speed of the engine and control the output torque of the engine to meet set conditions.

9. A vehicle, characterized in that, Includes the hybrid vehicle engine speed control system as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the hybrid vehicle engine speed control method according to any one of claims 1 to 7.

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