Engine control method for hybrid vehicle, medium, controller and vehicle

Abstract

An engine control method for a hybrid vehicle comprises: in response to a shutdown requirement of an engine, controlling the engine to perform torque reduction, and using an ISG motor to stabilize the rotating speed of the engine at the minimum idling power generation rotating speed; and when the torque of the engine is reduced to zero and the rotating speed of the engine is stabilized at the minimum idling power generation rotating speed for a first preset time, controlling the ISG motor to drag-stop the engine.

Description

Engine control method and medium, controller and vehicle for hybrid vehicle

[0001] Priority information

[0002] The present application claims priority to and the benefit of the filing date of the Chinese Patent Application No. 2024102201282 filed on February 28, 2024 with the China National Intellectual Property Office, and incorporates herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of engine control, and in particular to an engine control method and medium, controller and vehicle for hybrid vehicle. BACKGROUND

[0004] The related engine stop control technology, by the engine control unit to the engine speed closed loop control, there is slow convergence of speed, long stop time, can't quickly reach the target speed and the adjustment range is limited the shortcomings.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide an engine control method for hybrid vehicle, which has the advantages of fast response of engine speed control before stopping, controllable engine speed change when stopping, and stable system state.

[0007] A second object of the present application is to provide a computer-readable storage medium.

[0008] A third object of the present application is to provide a controller.

[0009] A fourth object of the present application is to provide a hybrid vehicle.

[0010] To achieve the above-mentioned objects, the first aspect of the present application provides an engine control method for hybrid vehicle, the hybrid vehicle comprising an engine and an ISG motor, the method comprising: in response to a demand for stopping the engine, controlling the engine to reduce torque, and using the ISG motor to stabilize the engine speed at the idle minimum power generation speed; when the torque of the engine is reduced to zero and the time for the engine speed to stabilize at the idle minimum power generation speed reaches a first preset time, controlling the ISG motor to stop the engine.

[0011] The engine control method of the hybrid vehicle according to the embodiment of the present application controls the engine to reduce torque, controls the engine speed of the engine by the ISG motor, accelerates the convergence of the engine speed before shutdown, and controls the engine speed of the engine by the ISG motor when the engine torque is reduced to zero, thereby ensuring the fast response of the engine speed control before shutdown, the controllable change of the engine speed at shutdown, and the stability of the system state.

[0012] In addition, the engine control method of the hybrid vehicle according to the above embodiment of the present application can further have the following additional technical features.

[0013] According to one embodiment of the present application, the control of the engine to reduce torque and the adjustment of the engine speed of the engine to the idle minimum power generation speed by the ISG motor comprises: determining an idle target indicated torque and an idle minimum power generation speed; controlling the torque of the engine to be reduced to the idle target indicated torque, and controlling the ISG motor according to the real-time engine speed to stabilize the engine speed at the idle minimum power generation speed; when the time for stabilizing the engine speed at the idle minimum power generation speed reaches a second preset time, controlling the torque of the engine to be reduced from the idle target indicated torque to zero, and controlling the ISG motor to increase torque to stabilize the engine speed at the idle minimum power generation speed when the time reaches a first preset time.

[0014] According to one embodiment of the present application, the method further comprises: controlling the pressure in the cylinder of the engine when the torque of the engine is reduced to zero.

[0015] According to one embodiment of the present application, the determination of the idle target indicated torque comprises: determining the idle target indicated torque according to the engine speed and the coolant temperature before the response to the shutdown demand of the engine.

[0016] According to one embodiment of the present application, the determination of the idle minimum power generation speed comprises: determining the idle minimum power generation speed according to the smaller value of the engine speed and the idle shutdown maximum speed before the response to the shutdown demand of the engine.

[0017] According to one embodiment of the present application, the control of the pressure in the cylinder of the engine comprises: controlling the engine to prohibit fuel injection and close the throttle valve of the engine.

[0018] According to one embodiment of the present application, the method further comprises: prohibiting the ignition of the engine.

[0019] According to one embodiment of the present application, the step of controlling the ISG motor according to the real-time speed of the engine to stabilize the speed of the engine at the idle minimum power generation speed comprises: calculating the difference between the real-time speed of the engine and the idle minimum power generation speed; and controlling the ISG motor according to the difference to stabilize the speed of the engine at the idle minimum power generation speed.

[0020] According to one embodiment of the present application, during the step of controlling the ISG motor according to the real-time speed of the engine to stabilize the speed of the engine at the idle minimum power generation speed, the method further comprises: if the real-time speed of the engine is less than a minimum preset speed, reducing the output torque of the ISG motor; and if the real-time speed of the engine is greater than or equal to the minimum preset speed and less than the idle minimum power generation speed, performing the step of controlling the ISG motor to stall the engine.

[0021] According to one embodiment of the present application, the step of controlling the ISG motor to increase the torque comprises: according to the idle minimum power generation speed, reducing the slope of the loading or unloading of the output torque of the ISG motor in a target torque range.

[0022] According to one embodiment of the present application, the method further comprises: during the step of controlling the ISG motor to increase the torque to stabilize the speed of the engine at the idle minimum power generation speed, when the speed of the engine fluctuates, unidirectionally limiting the output torque of the ISG motor.

[0023] To achieve the above object, a second aspect of the present application provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the engine control method of the hybrid vehicle according to the first aspect of the present application.

[0024] To achieve the above object, a third aspect of the present application provides a controller, which comprises a memory and a processor. The memory stores a computer program. The computer program is executed by the processor to implement the engine control method of the hybrid vehicle according to the first aspect of the present application.

[0025] To achieve the above object, a fourth aspect of the present application provides a hybrid vehicle, which comprises an engine, an ISG motor and the controller according to the third aspect of the present application.

[0026] Additional aspects and advantages of the present application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] FIG1 is a flow chart of an engine control method for a hybrid vehicle according to an embodiment of the present application;

[0028] FIG2 is a flow chart of adjusting the engine speed to the idle minimum power generation speed according to one embodiment of the present application;

[0029] FIG3 is a flow chart of an engine control method for a hybrid vehicle according to a specific embodiment of the present application;

[0030] FIG4 is a block diagram of a controller according to an embodiment of the present application;

[0031] FIG5 is a schematic diagram of a hybrid vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] The engine control method and medium, controller 500, and vehicle 1000 of the hybrid vehicle according to the embodiment of the present application are described in detail below with reference to Figures 1-5 of the specification and specific implementation methods.

[0034] In the embodiment of the present application, the hybrid vehicle 1000 may include an engine 100 and an ISG (Integrated Starter and Generate motor) motor 300 .

[0035] FIG1 is a flow chart of an engine control method for a hybrid vehicle according to an embodiment of the present invention. As shown in FIG1 , the engine control method for a hybrid vehicle may include:

[0036] S101, in response to a shutdown request of the engine 100, controlling the engine 100 to reduce torque, and utilizing the ISG motor 300 to stabilize the speed of the engine 100 at the minimum idle power generation speed;

[0037] S102 , when the torque of the engine 100 is reduced to zero and the time during which the speed of the engine 100 is stabilized at the idle minimum power generation speed reaches a first preset time, the ISG motor 300 is controlled to stop the engine 100 .

[0038] For example, when the target operating mode of the engine 100 is switched from the parallel / series operating mode to the stop operating mode, or when it is determined according to the state of charge (SOC) of the power battery, the discharge power, the driving demand power, or the like that the engine 100 needs to be stopped, the engine 100 is controlled to stop.

[0039] In the embodiment of the present application, the power domain controller controls the engine control module (ECM) and the ISG motor 300 to complete the stop control of the engine 100.

[0040] In the embodiment of the present application, the power domain controller can be a power-train control module (PCM), a vehicle control unit (VCU), an electronic control unit (ECU), or the like.

[0041] In the embodiment of the present application, when the engine 100 is controlled to stop, in order to accelerate the convergence of the engine speed of the engine 100, the PCM controls the output torque of the ISG motor 300 while controlling the ECM to reduce the torque of the engine 100 to reduce the engine speed of the engine 100. That is, the engine speed of the engine 100 is controlled by the ECM and the ISG motor 300 together to quickly adjust the engine speed of the engine 100 to the idle minimum power generation speed and stabilize at the idle minimum power generation speed. When the PCM controls the ECM to reduce the torque of the engine 100 to zero, the engine speed of the engine 100 is controlled by the ISG motor 300 alone, and when the engine speed of the engine 100 stabilizes at the idle minimum power generation speed for a first preset time N1, the engine 100 is stopped by controlling the ISG motor 300 to pull the engine 100, thereby ensuring the stability of the system state before stopping.

[0042] In the embodiment of the present application, when the ISG motor 300 is controlled to pull the engine 100 to stop, the target speed of the ISG motor 300 can be converted to 0 rpm (revolutions per minute) to pull the engine speed of the engine 100 to 0 rpm to stop by outputting the feedback torque of the ISG motor 300.

[0043] In one embodiment of the present application, as shown in FIG. 2, the engine 100 is controlled to reduce the torque, and the engine speed of the engine 100 is stabilized at the idle minimum power generation speed by using the ISG motor 300, which can include:

[0044] S201, determining the idle target indication torque and the idle minimum power generation speed;

[0045] S202, control the torque of the engine 100 to decrease to the idle target indicated torque, and control the ISG motor 300 according to the real-time speed of the engine 100 to stabilize the speed of the engine 100 at the idle minimum power generation speed;

[0046] S203, when the time for stabilizing the speed of the engine 100 at the idle minimum power generation speed reaches the second preset time, control the torque of the engine 100 to decrease from the idle target indicated torque to zero, and control the ISG motor 300 to increase the torque to stabilize the speed of the engine 100 at the idle minimum power generation speed when the time for stabilizing the speed of the engine 100 at the idle minimum power generation speed reaches the first preset time.

[0047] Specifically, after the PCM determines the idle target indicated torque T1 and the idle minimum power generation speed, the PCM sends the idle target indicated torque T1 to the ECM. The ECM controls the torque of the engine 100 to decrease to the idle target indicated torque T1 in response to the idle target indicated torque T1 sent by the PCM. At the same time, the PCM sends the idle minimum power generation speed to the ISG motor 300 to control the ISG to output a load torque according to the real-time speed of the engine 100 and the idle minimum power generation speed while the ECM is controlled to decrease the torque of the engine 100. Through the cooperation of the ECM and the ISG motor 300, the speed of the engine 100 is quickly adjusted to the idle minimum power generation speed.

[0048] The embodiment of the present application quickly adjusts the speed of the engine 100 to the idle minimum power generation speed and stabilizes the speed of the engine 100 at the idle minimum power generation speed by the way of feedforward adjusting the torque of the engine 100 and feedback adjusting the torque of the ISG motor 300, and realizes the quick convergence of the speed of the engine 100.

[0049] When the time for stabilizing the speed of the engine 100 at the idle minimum power generation speed reaches the second preset time N2, the PCM decays the target indicated torque T1 to zero at a certain rate, and controls the torque of the engine 100 to decrease from the idle target indicated torque T1 to zero torque through the ECM, and at the same time, controls the ISG motor 300 to start the segmented torque increase. The stable control of the speed of the engine 100 by the ECM and the ISG motor 300 is changed to the stable control of the speed of the engine 100 by the ISG alone, so that the speed of the engine 100 is stabilized at the idle minimum power generation speed.

[0050] Before the engine 100 is controlled to stop, the embodiment of the present application cooperatively controls the speed of the engine 100 by the ECM and the ISG motor 300, and the transition of the speed of the engine 100 is controlled by the ISG motor 300 and the ECM together, and then the speed of the engine 100 is controlled by the ISG alone, so that the stability of the system state before stopping is ensured.

[0051] In an embodiment of the present application, determining the idle target indicated torque can comprise:

[0052] The idle target indicated torque is determined according to the engine speed of the engine 100 before the engine 100 is required to stop and the coolant temperature in response to the requirement of the engine 100 to stop.

[0053] Specifically, the PCM can determine the idle target indicated torque according to the engine speed of the engine 100 before the engine 100 is required to stop and the coolant temperature in response to the requirement of the engine 100 to stop by using a lookup table method, and send the idle target indicated torque T1 to the ECM.

[0054] An embodiment of the present application takes the engine speed of the engine 100 and the coolant temperature lookup table engine 100 system resistance torque as a feedforward link.

[0055] In an embodiment of the present application, determining the idle minimum power generation speed can comprise:

[0056] The idle minimum power generation speed is determined according to the smaller value between the engine speed of the engine 100 before the engine 100 is required to stop and the idle stop maximum speed in response to the requirement of the engine 100 to stop.

[0057] Specifically, the PCM takes the smaller value between the engine speed of the engine 100 before the engine 100 is required to stop and the idle stop maximum speed in response to the requirement of the engine 100 to stop, and sends the idle minimum power generation speed to the ISG motor 300.

[0058] In an embodiment of the present application, controlling the ISG motor 300 according to the real-time engine speed of the engine 100 to stabilize the engine speed of the engine 100 at the idle minimum power generation speed can comprise:

[0059] Calculating the difference between the real-time engine speed of the engine 100 and the idle minimum power generation speed;

[0060] Controlling the ISG motor 300 according to the difference to stabilize the engine speed of the engine 100 at the idle minimum power generation speed.

[0061] Specifically, the difference between the real-time engine speed of the engine 100 and the idle minimum power generation speed is calculated, and the ISG torque is output for feedback control according to the calculated difference to stabilize the engine speed of the engine 100 at the idle minimum power generation speed.

[0062] An embodiment of the present application controls the ISG motor 300 to perform closed-loop coordinated control on the engine speed of the engine 100, and adjusts the engine speed of the engine 100 to the idle minimum power generation speed in a closed loop.

[0063] In one embodiment of the present application, the ISG motor 300 is controlled according to the real-time speed of the engine 100 in the process of stabilizing the speed of the engine 100 at the idle minimum power generation speed, and the engine control method of the hybrid vehicle further comprises:

[0064] If the real-time speed of the engine 100 is less than the minimum preset speed, the output torque of the ISG motor 300 is reduced;

[0065] If the real-time speed of the engine 100 is greater than or equal to the minimum preset speed and less than the idle minimum power generation speed, the step of controlling the ISG motor 300 to pull the engine 100 to stop is performed.

[0066] Specifically, in the process of stabilizing the speed of the engine 100 at the idle minimum power generation speed, the ISG motor 300 is controlled according to the real-time speed of the engine 100, and if the speed of the engine 100 is lower than the minimum set speed during the adjustment process, the output torque of the ISG motor 300 is controlled to be reduced to prevent the engine 100 from being overloaded and causing the engine 100 to stall. When the output torque of the ISG motor 300 is reduced to 0, if the speed of the engine 100 is still lower than the minimum set speed, the ISG motor 300 is controlled to pull the engine 100 to stop. If the real-time speed of the engine 100 is greater than or equal to the minimum preset speed and less than the idle minimum power generation speed, the ISG motor 300 is controlled to pull the engine 100 to stop.

[0067] In an embodiment of the present application, the minimum preset speed can be 500 rpm-800 rpm.

[0068] In one embodiment of the present application, the engine control method of the hybrid vehicle further comprises:

[0069] When the torque of the engine 100 is reduced to zero, the pressure in the cylinder of the engine 100 is controlled.

[0070] Specifically, when the torque of the engine 100 is reduced to zero, the PCM controls the ECM to control the pressure in the cylinder of the engine 100, so that the pressure in the cylinder of the engine 100 is controlled, avoiding knocking noise during the stopping process.

[0071] In one embodiment of the present application, controlling the pressure in the cylinder of the engine 100 comprises: controlling the engine 100 to prohibit fuel injection and closing the throttle valve of the engine 100.

[0072] Specifically, when the torque of the engine 100 is unloaded to zero, the engine 100 is controlled to prohibit fuel injection and close the throttle valve of the engine 100.

[0073] If implemented, the PCM controls the ECM to perform the throttle closing action and sends an injection prohibition command to the ECM, and the ECM controls the engine 100 to prohibit injection in response to the injection prohibition command. It should be noted that the engine 100 prohibits injection but does not stop ignition.

[0074] The embodiment of the present application controls the engine 100 to close the throttle before controlling the engine 100 to stop, so that the in-cylinder pressure is controlled, the excessive torsional vibration and reverse rotation of the engine 100 during stopping are suppressed, and the problem of gear knocking caused by the reverse rotation of the engine 100 is avoided.

[0075] In an embodiment of the present application, the engine control method of the hybrid vehicle further includes prohibiting ignition of the engine 100.

[0076] Specifically, the PCM sends a stop command, and the ECM controls ignition enable prohibition in response to the stop command to prohibit ignition of the engine 100.

[0077] In an embodiment of the present application, controlling the ISG motor 300 to increase torque can include:

[0078] According to the idle minimum power generation speed, the slope of loading or unloading of the output torque of the ISG motor 300 is reduced in the target torque range.

[0079] Specifically, while controlling the torque of the engine 100 to decrease from the idle target indication torque T1 to zero torque, according to the idle minimum power generation speed, the slope of loading or unloading of the output torque of the ISG motor 300 is reduced in the target torque range.

[0080] In an embodiment of the present application, the engine control method of the hybrid vehicle further includes:

[0081] In the process of controlling the ISG motor 300 to increase torque to stabilize the speed of the engine 100 at the idle minimum power generation speed, when the speed of the engine 100 fluctuates, the output torque of the ISG motor 300 is unidirectionally limited.

[0082] Specifically, in the process of controlling the ISG motor 300 to increase torque to stabilize the speed of the engine 100 at the idle minimum power generation speed, when the speed of the engine 100 fluctuates, the output torque of the ISG motor 300 is unidirectionally limited. That is, according to the positive or negative of the output torque of the ISG motor 300 at the previous moment, the positive or negative of the output torque of the ISG motor 300 at the current moment is determined, to avoid the gear knocking caused by the frequent change of the ISG torque across 0.

[0083] As a specific embodiment, as shown in Fig. 3, the PCM sends an idle target indication torque T1 to the ECM and starts timing Time1. The PCM sends an idle minimum generation speed to the ISG motor 300 according to the minimum value of the engine 100 speed before the engine 100 stops in response to the stop demand and the idle maximum stop speed. The PCM compares the real-time speed of the engine 100 with the idle minimum generation speed, calculates the ISG adjustment speed torque according to the difference obtained by the comparison, and executes the ISG adjustment speed torque by the ISG. If the speed of the engine 100 is less than the minimum set speed during the adjustment, the ISG adjustment torque is reduced to prevent the engine 100 load torque from being too large, which causes the engine 100 to stall. If the speed of the engine 100 is greater than or equal to the minimum set speed and less than the idle minimum generation speed, the ISG motor 300 is controlled to pull the engine 100 to stop. When the timing Time1 is reached (it is to be noted that the time for the speed of the engine 100 to stabilize at the idle minimum generation speed reaches a second preset time N2, i.e., Time1>N2), the PCM decays the target indication torque T1 at a certain rate and starts timing Time2. The ISG torque is further adjusted according to the idle minimum generation speed when the target indication torque T1 starts to decay, and the slope of the ISG torque load or unload is reduced in the torque [-T_isg, T_isg] interval. When the torque of the engine 100 is reduced to zero, the PCM controls the ECM to perform a throttle closing action and sends an oil injection prohibition instruction to the ECM, and the ECM controls the engine 100 to prohibit oil injection in response to the oil injection prohibition instruction. When the timing Time2 is reached (it is to be noted that the time for the speed of the engine 100 to stabilize at the idle minimum generation speed reaches a first preset time N1, i.e., Time2>N1), the ISG motor 300 is controlled to pull the engine 100 to stop.

[0084] The engine control method of the hybrid vehicle of the embodiment of the present application controls the ISG and the engine 100 in coordination, so that the speed and the moment of inertia of the engine 100 before stopping are highly consistent. The throttle is closed before stopping, which can inhibit the excessive torsional vibration and the reverse rotation of the engine 100 before stopping, and avoid the problems such as gear pair knocking caused by the reverse rotation of the engine 100.

[0085] The engine control method of the hybrid vehicle of the embodiment of the present application uses the feedforward plus feedback adjustment mode to quickly stabilize the speed of the engine 100, and the speed control before stopping is controlled by the ISG alone instead of being controlled by the ISG and the ECM together, which ensures that the system state is stable before stopping. The throttle is closed and the oil injection is prohibited before stopping, so that the in-cylinder pressure can be controlled, and the knocking abnormal sound during the stopping process is avoided.

[0086] It should be noted that the starting of the hybrid vehicle 1000 usually adopts the ISG motor 300, and for the hybrid vehicle 1000 with a double-motor series-parallel or extended-range structure, the engine 100 and the generator are rigidly connected through a gear pair and a torque damper, and the inertia of the generator is much larger than that of the conventional vehicle 1000 with a starter, so the stability of the engine 100 speed and load torque and the size of the cylinder pressure in the initial state of the stop machine have a significant impact on the stop NVH (Noise, Vibration, Harshness, noise, vibration and harshness) quality. The control method of the embodiment of the application can also improve the stop NVH quality of the hybrid vehicle 1000.

[0087] The application provides a computer-readable storage medium.

[0088] In this embodiment, the computer-readable storage medium stores a computer program, and the computer program is executed by the processor to implement the engine control method of the hybrid vehicle as described above.

[0089] The application provides a controller 500.

[0090] In this embodiment, the controller 500 can include a memory and a processor, and the memory stores a computer program, wherein the computer program is executed by the processor to implement the engine control method of the hybrid vehicle as described above.

[0091] FIG. 4 is a structural block diagram of the controller 500 of the embodiment of the application.

[0092] As shown in FIG. 4, the controller 500 includes a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, for example, through a bus 502. Optionally, the controller 500 can also include a transceiver 504. It should be noted that in actual applications, the transceiver 504 is not limited to one, and the structure of the controller 500 does not constitute a limitation on the embodiments of the application.

[0093] The processor 501 can be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure. The processor 501 can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of DSP and microprocessor, etc.

[0094] The bus 502 can include a path for transmitting information between the above-mentioned components. The bus 502 can be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus 502 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is shown in FIG. 4, but it does not mean that there is only one bus or only one type of bus.

[0095] The memory 503 is used to store a computer program corresponding to the engine control method of the hybrid vehicle of the above-mentioned embodiments of the present application, which is controlled and executed by the processor 501. The processor 501 is used to execute the computer program stored in the memory 503 to realize the content shown in the foregoing method embodiments.

[0096] The controller 500 includes, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (Personal Digital Assistant), a PAD (Tablet Personal Computer), a PMP (Portable Multimedia Player), a vehicle terminal (such as a vehicle navigation terminal), and the like, and a fixed terminal such as a digital TV, a desktop computer, and the like. The controller 500 shown in FIG. 4 is only an example, and should not limit the functions and use range of the embodiments of the present application.

[0097] The computer readable storage medium and the controller 500 of the embodiments of the present application use the above-mentioned engine control method of the hybrid vehicle, which ensures that the engine 100 speed control response is fast before shutdown, the system state is stable, the engine 100 speed change is controllable at shutdown, and knocking abnormal sound is avoided during shutdown process.

[0098] The application provides a hybrid vehicle 1000.

[0099] Fig. 5 is a schematic view of the hybrid vehicle 1000 according to an embodiment of the application. As shown in Fig. 5, the hybrid vehicle 1000 can include an engine 100, an ISG motor 300, and the controller 500 as described above.

[0100] It should be noted that the controller 500 is a power domain controller. For example, a PCM, a VCU, an ECU, or the like can be used.

[0101] The hybrid vehicle 1000 according to the embodiments of the application ensures the fast response of the engine 100 speed control before shutdown, the stability of the system state, and the controllable engine 100 speed change at shutdown, thereby avoiding knocking noise during the shutdown process.

[0102] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a list of executable instructions for implementing logic functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions, or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection having one or more wires (electrical devices), a portable computer diskette (magnetic devices), 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 can even be paper or another suitable medium on which the program is printed, because the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by electronic means to obtain the program, and then the program can be stored in the computer memory.

[0103] It should be understood that various aspects of the application can be implemented in hardware, software, firmware or a combination of them. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application data signal, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0104] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] In the description of the present application, it should be understood that the orientation or positional relationship indicated by 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" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0106] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0107] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0108] In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0109] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for controlling an engine of a hybrid vehicle, wherein: The hybrid vehicle (1000) comprises an engine (100) and an ISG motor (300), and the method comprises: In response to a shutdown requirement of the engine (100), the engine (100) is controlled to reduce torque, and the rotation speed of the engine (100) is stabilized at an idle minimum power generation speed by using the ISG motor (300); When the torque of the engine (100) is reduced to zero and the time during which the rotation speed of the engine (100) is stabilized at the idle minimum power generation rotation speed reaches a first preset time, the ISG motor (300) is controlled to stop the engine (100).

2. The hybrid vehicle engine control method according to claim 1, wherein: The controlling of the engine (100) to reduce torque and stabilizing the rotation speed of the engine (100) at an idle minimum power generation speed by using the ISG motor (300) comprises: Determine the idle target indicated torque and the idle minimum generating speed; Controlling the torque of the engine (100) to decrease to the idle target indicated torque, and controlling the ISG motor (300) according to the real-time rotation speed of the engine (100) to stabilize the rotation speed of the engine (100) at the idle minimum power generation rotation speed; When the time for the rotation speed of the engine (100) to be stabilized at the idle minimum power generation speed reaches a second preset time, the torque of the engine (100) is controlled to decrease from the idle target indicated torque to zero, and the ISG motor (300) is controlled to increase the torque, so that the rotation speed of the engine (100) is stabilized at the idle minimum power generation speed until the time reaches a first preset time.

3. The hybrid vehicle engine control method according to claim 1, wherein: The method further comprises: When the torque of the engine (100) is reduced to zero, the pressure in the cylinder of the engine (100) is controlled.

4. The engine control method for a hybrid vehicle according to claim 2, wherein: Determining the idle target indicated torque includes: The idle target indicated torque is determined based on the rotational speed and coolant temperature of the engine (100) before responding to a shutdown request of the engine (100).

5. The engine control method for a hybrid vehicle according to claim 2, wherein: Determining the idle minimum generating speed includes: The idle minimum power generation speed is determined according to the smaller value of the speed of the engine (100) before responding to the shutdown requirement of the engine (100) and the idle shutdown maximum speed.

6. The engine control method for a hybrid vehicle according to claim 3, wherein: The controlling of the pressure in the cylinder of the engine (100) comprises: The engine (100) is controlled to prohibit fuel injection and close the throttle of the engine (100).

7. The engine control method for a hybrid vehicle according to claim 6, wherein: The method further comprises: Ignition of the engine (100) is inhibited.

8. The engine control method for a hybrid vehicle according to claim 2, wherein: The controlling of the ISG motor (300) according to the real-time rotation speed of the engine (100) to stabilize the rotation speed of the engine (100) at the idle minimum power generation speed comprises: Calculating the difference between the real-time rotation speed of the engine (100) and the idle minimum power generation rotation speed; The ISG motor (300) is controlled according to the difference to stabilize the rotation speed of the engine (100) at the idle minimum power generation rotation speed.

9. The hybrid vehicle engine control method according to claim 2, wherein: In the process of controlling the ISG motor (300) according to the real-time rotation speed of the engine (100) to stabilize the rotation speed of the engine (100) at the idle minimum power generation rotation speed, the method further comprises: If the real-time speed of the engine (100) is less than a minimum preset speed, reducing the output torque of the ISG motor (300); If the real-time speed of the engine (100) is greater than or equal to the lowest preset speed and less than the idle minimum power generation speed, the step of controlling the ISG motor (300) to stop the engine (100) is performed.

10. The engine control method for a hybrid vehicle according to claim 2, wherein: The controlling of the ISG motor (300) to increase torque comprises: According to the idle minimum power generation speed, the slope of loading or unloading of the output torque of the ISG motor (300) is reduced in the target torque range.

11. The engine control method for a hybrid vehicle according to claim 8, wherein: The method further comprises: In the process of controlling the torque increase of the ISG motor (300) to stabilize the rotation speed of the engine (100) at the idle minimum power generation rotation speed, when the rotation speed of the engine (100) fluctuates, the output torque of the ISG motor (300) is unidirectionally limited.

12. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the method for controlling the engine (100) of the hybrid vehicle (1000) according to any one of claims 1 to 11 is implemented.

13. A controller (500), comprising a memory (503) and a processor (501), wherein the memory (503) stores a computer program, wherein: When the computer program is executed by the processor (501), the engine control method for a hybrid vehicle according to any one of claims 1 to 11 is implemented.

14. A hybrid vehicle (1000), wherein: include: An engine (100), an ISG motor (300), and a controller (500) as claimed in claim 13.

Images