Engine shutdown control method, system and equipment, storage medium and vehicle

Abstract

The invention provides an engine shutdown control method, system and device, a storage medium and a vehicle. The method comprises the steps that when an engine shutdown demand is detected, a fuel cut-off shutdown instruction is sent to an engine controller; the current rotating speed of the engine is obtained when the fuel cut-off shutdown instruction is sent out; controlling the generator to reversely drag the engine to run for preset time at a fixed rotating speed based on the current rotating speed of the engine; and after the preset time, the rotating speed of the generator is controlled to be gradually reduced to zero, so that the engine is stopped. The problems of shutdown shaking and waste gas residue can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an engine shutdown control method, system, device, storage medium and vehicle. Background Art

[0002] With the vigorous development of new energy vehicles, extended-range electric vehicles have been accepted and recognized by more consumers because they effectively solve the range problem of current pure electric vehicles and have the advantage of low vehicle cost.

[0003] Methanol-range extended-range vehicles have shown great potential for application in the commercial vehicle sector, especially under specific operating conditions, due to their environmental, economic and technical advantages. Compared with traditional gasoline and diesel vehicles, methanol fuel produces less carbon dioxide and other pollutants when burned; as a low-carbon oxygen-containing fuel, methanol has high combustion efficiency and clean emissions, and is considered an ideal clean renewable energy source. In addition, the production conditions of methanol are relatively simple, and it can be produced through renewable energy sources such as wind and solar energy. Its market price is low, which has obvious cost advantages compared to traditional fuels.

[0004] With the gradual application of methanol engines, the control technology of methanol engines has attracted much attention. Especially in the field of methanol extended-range vehicles, the start-stop control technology of methanol engines is crucial, which directly affects its economy, stability and comfort. At present, the engine shutdown control of extended-range vehicles usually sends a fuel cut-off shutdown command to the engine controller through the vehicle controller to let the engine shut down automatically. However, during the shutdown process, there will be vehicle jitter, poor shutdown NVH (Noise Vibration Harshness) performance and exhaust gas residue problems. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide an engine shutdown control method, system, device, storage medium and vehicle, which can effectively solve the problems of shutdown jitter and exhaust gas residue.

[0006] One aspect of an embodiment of the present application provides an engine shutdown control method. The method includes: when an engine shutdown demand is detected, sending a fuel cut-off shutdown command to an engine controller; obtaining the current speed of the engine when the fuel cut-off shutdown command is issued; based on the current speed of the engine, controlling the generator to reverse the engine to run at a fixed speed for a predetermined time; after the predetermined time, controlling the speed of the generator to gradually drop to zero to shut down the engine.

[0007] Further, controlling the rotation speed of the generator to gradually decrease to zero includes: controlling the rotation speed of the generator to gradually decrease to zero at a predetermined slope.

[0008] Further, controlling the generator to reversely drag the engine to run at a fixed speed for a predetermined time based on the current speed of the engine includes: determining a target control speed of the generator based on the current speed of the engine; and controlling the generator to reversely drag the engine to run at the target control speed of the generator for a predetermined time.

[0009] Furthermore, the method also includes: setting a shutdown speed upper limit and a shutdown speed lower limit in advance according to the idle speed of the engine, wherein determining the target control speed of the generator based on the current speed of the engine includes: determining the target control speed of the generator based on the current speed of the engine, the shutdown speed upper limit and the shutdown speed lower limit.

[0010] Further, determining the target control speed of the generator based on the current speed of the engine, the shutdown speed upper limit and the shutdown speed lower limit includes: when the current speed of the engine is between the shutdown speed upper limit and the shutdown speed lower limit, setting the current speed of the engine as the target control speed; when the current speed of the engine is higher than the shutdown speed upper limit, setting the shutdown speed upper limit as the target control speed of the generator; when the current speed of the engine is lower than the shutdown speed lower limit, setting the shutdown speed lower limit as the target control speed.

[0011] Furthermore, the method also includes: requesting a generator controller to control the speed of the generator at a target control speed of the generator, including: obtaining an actual speed of the generator; and the generator controller performing PID control on the speed of the generator based on a deviation between the actual speed and the target control speed of the generator.

[0012] Another aspect of an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the engine shutdown control method as described above.

[0013] Another aspect of an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the engine shutdown control method as described above when executed by a processor.

[0014] Another aspect of the embodiment of the present application provides an engine shutdown control system. The engine shutdown control system includes a vehicle controller, an engine, a generator, an engine controller and a generator controller, the engine is coaxially connected to the generator, the vehicle controller is respectively connected to the engine controller and the generator controller, the engine controller is used to control the engine, and the generator controller is used to control the generator, wherein the vehicle controller is used to send a fuel cut-off shutdown instruction to the engine controller when the engine shutdown requirement is detected, and obtain the current speed of the engine when the fuel cut-off shutdown instruction is issued, and send a speed control request to the generator controller based on the current speed of the engine; the generator controller is used to control the generator to reverse the engine to run at a fixed speed for a predetermined time in response to the speed control request, and after the predetermined time, control the speed of the generator to gradually drop to zero to stop the engine.

[0015] Another aspect of the embodiment of the present application further provides a vehicle, wherein the vehicle includes the engine shutdown control system as described above.

[0016] The engine shutdown control method, system, device, storage medium and vehicle of one or more embodiments of the present application can effectively solve the problem of engine shutdown jitter or noise of extended-range vehicles by controlling the generator to reverse the engine at the speed at the time of shutdown request to maintain operation for a certain period of time and then steadily reduce the speed until shutdown; at the same time, it delays the engine fuel cut-off idling time and reduces the problem of engine exhaust residue.

[0017] In addition, the engine shutdown control method, system, device, storage medium and vehicle of one or more embodiments of the present application can effectively and accurately control the generator and engine to operate at a reasonable speed by requesting the generator controller to control the generator speed, so as to achieve the desired control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flowchart of an engine shutdown control method according to an embodiment of the present invention.

[0019] Figure 2 A control curve diagram of the target control speed of the generator over time according to one embodiment of the present application.

[0020] Figure 3 The present invention is a schematic block diagram of a computer device according to an embodiment of the present invention.

[0021] Figure 4 A schematic block diagram of an engine shutdown control system according to an embodiment of the present application.

[0022] Figure 5A schematic block diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0024] The engine shutdown control method, system, device, storage medium and vehicle of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0025] The present application provides an engine shutdown control method. Figure 1 A flow chart of an engine shutdown control method according to an embodiment of the present application is disclosed. Figure 1 As shown, an engine shutdown control method according to an embodiment of the present application may include steps S11 to S16.

[0026] In step S11, it is detected whether there is an engine shutdown requirement. When the detection result is "yes", the process proceeds to step S12. Otherwise, it returns to step S11 to continue the detection.

[0027] In step S12, when the engine shutdown requirement is detected, a fuel cut-off shutdown instruction is sent to the engine controller.

[0028] In step S13, the current speed of the engine when the fuel cut-off shutdown instruction is issued is obtained, and the current speed of the engine is recorded and latched.

[0029] Since the engine and generator of the extended-range vehicle are coaxially connected and the two are directly connected, the speed of the engine and the speed of the generator are synchronized.

[0030] In step S14, the generator is controlled to reverse the engine to run at a fixed speed based on the current speed of the engine.

[0031] In step S15, it is determined whether the operation at a fixed speed in step S14 has reached a predetermined time. If the result of the determination is "yes", the process proceeds to step S16. Otherwise, the process returns to step S14 and continues to operate at a fixed speed until the predetermined time is reached.

[0032] In step S16, after a predetermined time, the rotation speed of the generator is controlled to gradually decrease to zero to stop the engine.

[0033] Optionally, the rotation speed of the generator can be controlled to gradually decrease to zero at a predetermined slope, thereby ensuring that the rotation speed of the engine is smoothly decreased to zero.

[0034] Figure 2 A control curve diagram of the target control speed of a generator over time according to an embodiment of the present application is disclosed. Figure 2 As shown, the horizontal axis t represents time, and the vertical axis n represents the speed. At t=0, the engine controller issues a fuel cut-off shutdown command. At this time, the current speed of the engine is recorded as the engine shutdown speed n_stop. In the time period from 0 to t1, the generator is controlled to reverse the engine to run at the shutdown speed n_stop. After t1, the speed of the generator is controlled to gradually decrease to 0 according to a certain slope, so that the engine stops.

[0035] In some embodiments, step S14 of controlling the generator to reversely drive the engine to run at a fixed speed for a predetermined time based on the current speed of the engine may further include step S141 and step S142.

[0036] In step S141 , a target control speed of the generator is determined based on the current speed of the engine.

[0037] In some embodiments, the engine shutdown control method of the present application may further include step S17.

[0038] In step S17, the stop speed upper limit and the stop speed lower limit are set in advance according to the idle speed of the engine.

[0039] In this case, determining the target control speed of the generator based on the current speed of the engine in step S141 may include determining the target control speed of the generator based on the current speed of the engine in combination with the shutdown speed upper limit and the shutdown speed lower limit of the generator.

[0040] Specifically, Figure 2As shown, when the current speed of the engine, i.e., the speed at the stop time n_stop, is between the stop speed upper limit n_up and the stop speed lower limit n_down of the generator, the current speed of the engine, i.e., the speed at the stop time n_stop, can be set as the target control speed n_target of the generator, i.e., n_target=n_stop(n_down≤n_stop≤n_up); when the speed n_stop of the engine at the stop time is higher than the stop speed upper limit n_up of the generator, the stop speed upper limit n_up of the generator can be set as the target control speed n_target of the generator, i.e., n_target=n_up(n_stop>n_up); when the speed n_stop of the engine at the stop time is lower than the stop speed lower limit n_down of the generator, the stop speed lower limit n_down of the generator is set as the target control speed n_target of the generator, i.e., n_target=n_down(n_stop <n_down)。

[0041] In step S142, the generator is controlled to reversely drive the engine to run at the target control speed of the generator for a predetermined time.

[0042] In some embodiments, the engine shutdown control method of the present application may further include step S18.

[0043] In step S18, the generator controller is requested to control the rotation speed of the generator at the target control rotation speed of the generator.

[0044] In some embodiments, step S18 may further include step S181 and step S182.

[0045] In step S181, the actual rotation speed of the generator is obtained.

[0046] In step S182, the generator controller may perform PID (Proportional Integral Derivative) control on the generator speed based on the deviation between the actual speed of the generator and the target control speed of the generator, thereby stabilizing the generator speed at the target control speed.

[0047] The engine shutdown control method of the present application controls the generator to reverse the engine at the speed at the time of shutdown request to maintain operation for a certain period of time and then steadily reduce the speed until shutdown, thereby effectively solving the problem of engine shutdown jitter or noise of extended-range vehicles; at the same time, delaying the engine fuel cut-off idling time and reducing the problem of engine exhaust residue.

[0048] In addition, the engine shutdown control method of the present application can effectively and accurately control the generator and the engine to operate at a reasonable speed by requesting the generator controller to control the speed of the generator, so as to achieve the desired control effect.

[0049] The engine shutdown control method of the present application can not only be used in methanol-range extended-range vehicles to improve engine shutdown smoothness and emission performance, but can also be used in diesel or gasoline-range extended-range vehicles to solve the same technical problems.

[0050] The present application also provides a computer device. Figure 3 A schematic block diagram of a computer device according to an embodiment of the present application is disclosed. Figure 3 As shown, a computer device 300 of an embodiment of the present application includes a processor 301, an internal bus 302, a network interface 303, a memory 304, and a non-volatile memory 305, and may also include hardware required for other services. The processor 301 can read the corresponding computer program from the non-volatile memory 305 into the memory 304 and then run it to implement the steps of the engine shutdown control method as described above. Of course, in addition to the software implementation, the present application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic components.

[0051] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the engine shutdown control method described above are implemented.

[0052] The present application also provides an engine shutdown control system 400 . Figure 4 A schematic block diagram of an engine shutdown control system 400 according to an embodiment of the present application is disclosed. Figure 4 As shown, an engine shutdown control system 400 of an embodiment of the present application includes a vehicle controller 401, an engine controller 402, a generator controller 403, an engine 404 and a generator 405. The engine 404 and the generator 405 are coaxially connected, and the vehicle controller 401 is respectively connected to the engine controller 402 and the generator controller 403 for communication. The engine controller 402 can be used to control the engine 404, and the generator controller 403 can be used to control the generator 405.

[0053] When the vehicle controller 401 detects the need to shut down the engine, it can send a fuel cut-off shutdown command to the engine controller 402, and simultaneously obtain the current speed of the engine 404 when the fuel cut-off shutdown command is issued. Then, the vehicle controller 401 can send a speed control request to the generator controller 403 based on the current speed of the engine 404.

[0054] After receiving the speed control request sent by the vehicle controller 401, the generator controller 403 can control the generator 405 to reverse the engine 404 at a fixed speed for a predetermined time in response to the speed control request, and after the predetermined time, control the speed of the generator 405 to gradually drop to zero to shut down the engine 404.

[0055] In some embodiments, the generator controller 403 may control the rotation speed of the generator 405 to gradually decrease to zero according to a predetermined slope after a predetermined time.

[0056] In some embodiments, the vehicle controller 401 can determine the target control speed of the generator 405 based on the current speed of the engine 404, and then the generator controller 403 can control the generator 405 to reverse the engine 404 and run at the target control speed of the generator for a predetermined time.

[0057] In some embodiments, the upper and lower limits of the shutdown speed of the generator 405 are pre-stored in the vehicle controller 401. When the current speed of the engine 404 is between the upper and lower limits of the shutdown speed of the generator 405, the vehicle controller 401 can set the current speed of the engine 404 as the target control speed of the generator 405; when the current speed of the engine 404 is higher than the upper limit of the shutdown speed of the generator 405, the vehicle controller 401 can set the upper limit of the shutdown speed of the generator 405 as the target control speed of the generator 405; when the current speed of the engine 404 is lower than the lower limit of the shutdown speed of the generator 405, the vehicle controller 401 can set the lower limit of the shutdown speed of the generator 405 as the target control speed of the generator 405.

[0058] The engine shutdown control system 400 of the present application may have beneficial technical effects similar to those of the engine shutdown control method described above, and therefore, they will not be described in detail herein.

[0059] The present application also provides a vehicle 500 . Figure 5 A schematic block diagram of a vehicle 500 according to an embodiment of the present application is disclosed. Figure 5 As shown, the vehicle 500 includes the engine stop control system 400 as described above.

[0060] The above is a detailed introduction to the engine shutdown control method, system, device, storage medium and vehicle provided in the embodiments of the present application. Specific examples are used herein to illustrate the engine shutdown control method, system, device, storage medium and vehicle in the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. An engine shutdown control method, characterized in that: include: When the engine shutdown requirement is detected, a fuel cut-off shutdown instruction is sent to the engine controller; Obtaining the current speed of the engine when the fuel cut-off shutdown instruction is issued; Based on the current speed of the engine, the generator is controlled to reversely drive the engine to run at a fixed speed for a predetermined time; After the predetermined time, the rotation speed of the generator is controlled to gradually decrease to zero to stop the engine.

2. The method according to claim 1, characterized in that The step of controlling the rotation speed of the generator to gradually decrease to zero comprises: The rotation speed of the generator is controlled to gradually decrease to zero at a predetermined slope.

3. The method according to claim 1, characterized in that The controlling the generator to reversely drag the engine to run at a fixed speed for a predetermined time based on the current speed of the engine comprises: determining a target control speed of the generator based on a current speed of the engine; The generator is controlled to reversely drag the engine to operate at a target control speed of the generator for a predetermined time.

4. The method according to claim 3, characterized in that Also includes: The upper and lower limits of the shutdown speed are set in advance according to the idle speed of the engine. Wherein, determining the target control speed of the generator based on the current speed of the engine includes: A target control speed of the generator is determined based on a current speed of the engine, the stop speed upper limit, and the stop speed lower limit.

5. The method according to claim 4, characterized in that The step of determining the target control speed of the generator based on the current speed of the engine, the upper limit of the shutdown speed, and the lower limit of the shutdown speed includes: When the current speed of the engine is between the shutdown speed upper limit and the shutdown speed lower limit, the current speed of the engine is set as the target control speed of the generator; When the current speed of the engine is higher than the shutdown speed upper limit, the shutdown speed upper limit is set as the target control speed of the generator; When the current speed of the engine is lower than the shutdown speed lower limit, the shutdown speed lower limit is set as the target control speed of the generator.

6. The method according to claim 3, characterized in that Also includes: Requesting a generator controller to control the speed of the generator at a target control speed of the generator includes: Obtaining an actual rotation speed of the generator; The generator controller performs PID control on the rotation speed of the generator based on a deviation between the actual rotation speed and a target control rotation speed of the generator.

7. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the engine stop control method according to any one of claims 1 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the engine stop control method according to any one of claims 1 to 6 are implemented.

9. An engine shutdown control system, characterized in that: It includes a vehicle controller, an engine, a generator, an engine controller and a generator controller. The engine is coaxially connected to the generator. The vehicle controller is communicatively connected to the engine controller and the generator controller respectively. The engine controller is used to control the engine, and the generator controller is used to control the generator. The vehicle controller is used to send a fuel cut-off shutdown instruction to the engine controller when the engine shutdown demand is detected, obtain the current speed of the engine when the fuel cut-off shutdown instruction is issued, and send a speed control request to the generator controller based on the current speed of the engine; The generator controller is used to control the generator to reverse the engine to run at a fixed speed for a predetermined time in response to the speed control request, and after the predetermined time, control the speed of the generator to gradually decrease to zero to stop the engine.

10. A vehicle, characterized in that: Includes the engine shutdown control system as claimed in claim 9.

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