Engine Abnormal Start Control Method and Related Equipment for Hybrid Electric Vehicles

Abstract

The embodiments of the present application relate to the technical field of hybrid electric vehicles, and disclose an abnormal engine start control method and related equipment for a hybrid electric vehicle. The method includes: in response to the abnormal engine start state in the hybrid electric vehicle being an active state, determining the target engine start speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature; determining the target current of the clutch control valve according to the target engine start speed and the actual engine speed; adjusting the actual engine speed according to the target current to obtain the adjusted actual engine speed; in response to the adjusted actual engine speed being greater than or equal to the preset speed threshold and the obtained engine start success flag state being an active state, determining that the abnormal engine start state is a success state. The present application can achieve the abnormal start of the generator in the generator failure state, and improve the adaptability of the hybrid electric vehicle in the failure state.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid electric vehicles, and particularly to an abnormal engine start control method for a hybrid electric vehicle, a hybrid electric vehicle, and a computer-readable storage medium. Background Art

[0002] With the continuous improvement of technology and living standards, people have put forward higher requirements for the abnormal handling of hybrid electric vehicles. Since a hybrid electric vehicle has two different forms of power sources, the hybrid control vehicle can still continue to travel using a single power source in a fault state.

[0003] To ensure the safety of the driver and passengers while enabling the vehicle to travel to a safe area, the effectiveness of the fault handling measures of hybrid electric vehicles has become a technical problem to be solved urgently. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide an abnormal engine start control method for a hybrid electric vehicle, a hybrid electric vehicle, and a computer-readable storage medium, which can realize the abnormal start of the engine in the state of generator failure and improve the adaptability of the hybrid electric vehicle in the failure state.

[0005] According to one aspect of the embodiments of the present application, an abnormal engine start control method for a hybrid electric vehicle is provided, including: in response to the abnormal engine start state in the hybrid electric vehicle being an activated state, determining an engine start target speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature; determining a target current of a clutch control valve according to the engine start target speed and the actual engine speed; adjusting the actual engine speed according to the target current to obtain an adjusted actual engine speed; and in response to the adjusted actual engine speed being greater than or equal to a preset speed threshold and the obtained engine start success flag state being an activated state, determining that the abnormal engine start state is a successful state.

[0006] In an alternative manner, the step of determining the target current of the clutch control valve according to the engine start target speed and the actual engine speed includes: calculating an engine speed difference between the engine start target speed and the actual engine speed; determining a clutch target pressure according to the obtained target increment control coefficient and the engine speed difference; and determining the target current of the clutch control valve according to the clutch target pressure and the transmission oil temperature.

[0007] In an alternative manner, the engine speed difference includes the engine speed difference at a first moment, the engine speed difference at a second moment, and the engine speed difference at a third moment, where the first moment is later than the second moment, and the second moment is later than the third moment; the target increment control coefficient includes a proportional control coefficient, a differential control coefficient, and an integral control coefficient; the step of determining the clutch target pressure according to the obtained target increment control coefficient and the engine speed difference includes: calculating a first difference between the engine speed difference at the first moment and the engine speed difference at the second moment, and calculating a second difference between the engine speed difference at the first moment and a preset multiple of the engine speed difference at the second moment; calculating the sum of the speeds between the second difference and the engine speed difference at the third moment; summing up the product of the calculated proportional control coefficient and the first difference, the product of the integral control coefficient and the engine speed difference at the first moment, and the product of the differential control coefficient and the sum of the speeds to obtain the clutch target pressure.

[0008] In an alternative manner, before the step of determining the clutch target pressure according to the obtained target increment control coefficient and the engine speed difference, the method further includes: obtaining the actual speed of the front drive motor and the hybrid system speed ratio; calculating the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed according to the actual speed of the front drive motor, the hybrid system speed ratio, and the actual engine speed; determining the target increment control coefficient from a preset increment control coefficient table according to the clutch speed difference and the transmission oil temperature, where the preset increment control coefficient table includes the corresponding relationship between the clutch speed difference, the transmission oil temperature, and the target increment control coefficient.

[0009] In an alternative manner, the hybrid system speed ratio includes the front drive motor transmission speed ratio and the engine transmission speed ratio; the step of calculating the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed according to the actual speed of the front drive motor, the hybrid system speed ratio, and the actual engine speed includes: calculating the ratio between the front drive motor transmission speed ratio and the actual speed of the front drive motor; calculating the product of the ratio and the engine transmission speed ratio; taking the difference between the product and the actual engine speed as the clutch speed difference.

[0010] In an alternative manner, the step of determining the target engine starting speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature includes: determining the initial engine starting speed from a preset initial engine starting speed table according to the engine water temperature, where the initial engine starting speed table includes the correspondence between the engine water temperature and the initial engine starting speed; determining a target gradient value for adjusting the initial engine starting speed from a preset speed gradient table according to the actual engine speed and the transmission oil temperature, the target gradient value including an ascending gradient value or a descending gradient value, and the speed gradient table including the correspondence between the actual engine speed, the transmission oil temperature, and the target gradient value; and performing gradient processing on the initial engine starting speed according to the target gradient value to obtain the target engine starting speed.

[0011] In an alternative manner, before the step of determining the target engine starting speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature, the method further includes: collecting vehicle information, where the vehicle information includes the remaining battery power, limp-home mode, engine fault level, engine state, clutch speed difference between the rotational speed of the clutch driving disc and the rotational speed of the clutch driven disc, transmission oil temperature, clutch disc temperature, and clutch system fault status; and determining that the abnormal engine starting state is an active state in response to the remaining battery power being less than or equal to a preset battery threshold, the limp-home mode being an active mode, the engine fault level being a preset fault level, the engine state being a stopped state, the clutch speed difference being less than or equal to a preset clutch speed threshold, the transmission oil temperature being less than or equal to a preset oil temperature threshold, the clutch disc temperature being less than or equal to a preset temperature threshold, and the clutch system fault status being a fault-free state, where the limp-home mode refers to the vehicle driving mode when the hybrid vehicle fails.

[0012] In an alternative manner, the method further includes: in response to the adjusted actual engine speed being less than the preset speed threshold, returning to the step of determining the target engine starting speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature in response to the abnormal engine starting state in the hybrid vehicle being an active state, and recording one jump. Until the total number of recorded jumps is greater than or equal to a preset number of jumps, set the engine starting success flag bit to be frozen and trigger the failure of the fault flag bit.

[0013] According to another aspect of the embodiments of the present application, a hybrid vehicle is provided, including a memory and a processor, where the processor is configured to execute program instructions stored in the memory to implement the method for controlling abnormal engine starting of a hybrid vehicle according to any one of the above.

[0014] According to another aspect of the embodiments of the present application, a computer-readable storage medium is provided, on which program instructions are stored, and when the program instructions are executed by a processor, the above-mentioned engine abnormal start control method based on a hybrid vehicle is implemented.

[0015] In the embodiments of the present application, in response to the abnormal start state of the engine in the hybrid vehicle being in an active state, the target current of the clutch control valve is determined based on the target engine start speed and the actual engine speed; and the actual engine speed is adjusted according to the target current; then, in response to the adjusted actual engine speed being greater than or equal to the preset speed threshold and the state of the obtained engine start success flag being in an active state, it is determined that the abnormal start state of the engine is a successful state. Thus, in the active state of the abnormal start state of the engine, the closed-loop control of the clutch speed is completed through the target current of the clutch control valve determined by the target engine start speed and the actual engine speed, and the abnormal start of the engine can be realized in the state of generator failure, so as to improve the adaptability of the hybrid vehicle in the failure state and ensure the safety of the passengers and drivers.

[0016] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to be able to understand the technical means of the embodiments of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification. These drawings show embodiments consistent with the present application and are used together with the specification to explain the technical solutions of the present application.

[0018] Figure 1 The flowchart shows an exemplary embodiment of the engine abnormal start control method based on a hybrid vehicle in the present application;

[0019] Figure 2 Shows Figure 1 The flowchart of an exemplary embodiment of step 120 in the engine abnormal start control method based on a hybrid vehicle;

[0020] Figure 3 Shows Figure 1 The flowchart of an exemplary embodiment of step 110 in the engine abnormal start control method based on a hybrid vehicle;

[0021] Figure 4 The flowchart shows an exemplary application scenario of the engine abnormal start control method based on a hybrid vehicle;

[0022] Figure 5 The structural schematic diagram of a hybrid vehicle in the present application is shown;

[0023] Figure 6 The structural schematic diagram of an embodiment of a hybrid vehicle in the present application is shown;

[0024] Figure 7 The structural schematic diagram of an embodiment of a computer-readable storage medium in the present application is shown. Detailed implementation manners

[0025] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0026] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of an exemplary embodiment of the engine abnormal start control method based on a hybrid vehicle in the present application. Specifically, the following steps may be included:

[0027] Step S110: In response to the engine abnormal start state in the hybrid vehicle being an activated state, determine the engine start target speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature.

[0028] First of all, it should be noted that a hybrid vehicle has two different forms of power sources, and the power source in the form of power generation has a low cost, so that users tend to prefer the power source in the form of power generation. However, the power source in the form of power generation is generated by a fixed battery, and there are easily problems such as generator failure or battery power exhaustion during the driving of the vehicle. To avoid safety problems during driving, in the embodiments of the present application, when a generator failure or battery power exhaustion is detected, the engine is started to enable the hybrid vehicle to continue driving through the engine even in the case of a generator failure. Among them, in the embodiments of the present application, the vehicle information needs to reach a state capable of activating the abnormal start of the generator before starting the engine.

[0029] Specifically, a hybrid vehicle collects vehicle information, where the vehicle information may include: accelerator pedal opening, actual clutch pressure, transmission oil temperature, engine flywheel end torque, actual engine speed, engine water temperature, engine fault level, engine status, engine start success flag, actual front drive motor speed, remaining battery charge SOC, estimated clutch disc temperature, clutch system fault status, and limp mode signal. Exemplarily, the vehicle information can be collected by the vehicle control unit HCU (Hybrid Control Unit) in the hybrid vehicle. Specifically, the HCU collects and analyzes the accelerator pedal opening, actual clutch pressure, and transmission oil temperature signals in real time; the HCU obtains the engine flywheel end torque, actual engine speed, engine water temperature, engine fault level, engine status, and engine start success flag from the engine management system through the controller area network; the HCU obtains the actual front drive motor speed signal from the front drive motor control unit through the controller area network; the HCU obtains the battery SOC signal from the battery management system through the controller area network; the HCU obtains the estimated clutch disc temperature, clutch system fault status, and limp mode signal from the internal related modules.

[0030] The hybrid vehicle determines whether the abnormal engine start state in the hybrid vehicle is an active state based on the collected vehicle information. In response to the abnormal engine start state in the hybrid vehicle being an active state, the target engine start speed is determined based on the obtained actual engine speed, engine water temperature, and transmission oil temperature.

[0031] Step S120: Determine the target current of the clutch control valve based on the target engine start speed and the actual engine speed.

[0032] The target current of the clutch control valve is used to control the clutch, thereby increasing the engine speed connected to the clutch.

[0033] The hybrid vehicle determines the target current of the clutch control valve based on the target engine start speed determined in step S120 and the obtained actual engine speed.

[0034] Step S130: Adjust the actual engine speed according to the target current to obtain the adjusted actual engine speed.

[0035] The hybrid vehicle controls the clutch based on the target current of the clutch control valve, thereby increasing the engine speed connected to the clutch to obtain the adjusted actual engine speed.

[0036] Step S140: In response to the adjusted actual engine speed being greater than or equal to the preset speed threshold and the status of the obtained engine start success flag being active, determine that the abnormal engine start state is a successful state.

[0037] The preset rotational speed threshold can be a rotational speed value set by the staff based on experience or determined according to the average value of the historical engine rotational speed. The embodiments of the present application do not limit this. Exemplarily, the preset rotational speed threshold can be 800 rpm.

[0038] The abnormal engine start state being a success state indicates that the actual engine rotational speed at this time is greater than or equal to the preset rotational speed threshold, that is, the engine meets the starting conditions and starts successfully.

[0039] During the process of determining the target current of the clutch control valve in a hybrid vehicle, the engine start request can be set to active and the engine start mode can be set to the standard mode, so that the actual engine rotational speed gradually increases until the actual engine rotational speed is greater than or equal to the preset rotational speed threshold, and the engine start success flag status obtained at this time is the active state. It is determined that the abnormal engine start state is the success state, and the working state of the hybrid system is triggered to enter the parallel mode. It should be noted that when the actual engine rotational speed is greater than or equal to 600 rpm and less than 800 rpm, the fuel injection command status of the hybrid vehicle is the active state. Additionally, it should be noted that if the adjusted actual engine rotational speed is less than the preset rotational speed threshold, return to step S110 and record one jump. Until the total number of recorded jumps is greater than or equal to the preset number of jumps, the engine start success flag is set to freeze, and the fault flag is triggered to fail. Among them, the preset number of jumps is 3 times.

[0040] It can be seen that the method for controlling abnormal engine start of a hybrid vehicle according to the embodiments of the present application responds to the activation state of the abnormal engine start state in the hybrid vehicle, determines the target current of the clutch control valve through the engine start target rotational speed and the actual engine rotational speed; and adjusts the rotational speed of the actual engine according to the target current; then, in response to the adjusted actual engine rotational speed being greater than or equal to the preset rotational speed threshold and the engine start success flag status obtained being the active state, it is determined that the abnormal engine start state is the success state. Thus, in the activation state of the abnormal engine start state, the target current of the clutch control valve determined through the engine start target rotational speed and the actual engine rotational speed completes the clutch rotational speed closed-loop control, and can realize the abnormal start of the engine in the generator failure state, so as to improve the adaptability of the hybrid vehicle in the failure state and ensure the safety of the passengers and drivers.

[0041] Based on the above embodiments, the embodiments of the present application adopt Figure 2 the flowchart shown to elaborate in detail how to determine the target current of the clutch control valve. Please refer to Figure 2 , Figure 2 which is Figure 1Schematic flow diagram of an exemplary embodiment of step 120 in the shown engine abnormal start control method based on a hybrid vehicle. Specifically, the method of this embodiment includes the following steps:

[0042] Step S210, calculate the engine speed difference between the engine start target speed and the actual engine speed.

[0043] The engine speed difference refers to the speed difference value between the engine start target speed and the actual engine speed. It should be noted that the value range of the engine speed difference is [0, 1500].

[0044] Specifically, the calculation of the engine speed difference satisfies the following formula:

[0045] e = n EngStrtReq - n EngAct

[0046] Where, n EngStrtReq is the engine start target speed, n EngAct is the actual engine speed, and e is the speed difference value between the engine start target speed and the actual engine speed, that is, the engine speed difference.

[0047] Step S220, determine the clutch target pressure according to the obtained target increment control coefficient and the engine speed difference.

[0048] The target increment control coefficient refers to the control coefficient in the incremental PID controller. Specifically, the target increment control coefficient includes a proportional control coefficient, a differential control coefficient, and an integral control coefficient. Among them, the proportional control coefficient is denoted as K p , the differential control coefficient is denoted as k d , and the integral control coefficient is denoted as k i . Exemplarily, for the acquisition method of the target increment control coefficient, the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed can be calculated according to the obtained actual speed of the front drive motor, the hybrid system speed ratio, and the actual engine speed; and the target increment control coefficient can be determined from the preset increment control coefficient table according to the clutch speed difference and the transmission oil temperature. Among them, the preset increment control coefficient table is constructed based on the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed, the transmission oil temperature, and the increment control coefficient determined through bench tests considering the clutch slip friction power. The preset increment control coefficient table includes the corresponding relationship between the clutch speed difference, the transmission oil temperature, and the target increment control coefficient. The hybrid system speed ratio includes the front drive motor transmission speed ratio and the engine transmission speed ratio.

[0049] It should be noted that the clutch speed difference between the clutch driving disc speed and the clutch driven disc speed is calculated based on the actual speed of the front drive motor, the speed ratio of the hybrid power system, and the actual speed of the engine. Specifically, it is to calculate the ratio between the transmission speed ratio of the front drive motor and the actual speed of the front drive motor; calculate the product of the ratio and the engine transmission speed ratio; and use the difference between the product and the actual engine speed as the clutch speed difference. It should be noted that the target increment control coefficient can avoid the overshoot phenomenon of the incremental PID controller, the risk of clutch ablation caused by the overheating of the clutch, which leads to the failure of the abnormal engine start control function, and further leads to the problem of the complete loss of power of the hybrid vehicle.

[0050] Among them, the calculation of the clutch speed difference satisfies the following formula:

[0051]

[0052] Among them, n CluDiff is the clutch speed difference between the clutch driving disc speed and the clutch driven disc speed, r FmcuAct is the actual speed of the front drive motor, r Fmcu is the transmission speed ratio of the front drive motor, r EngTrsm is the engine transmission speed ratio, n EngAct is the actual engine speed.

[0053] The engine speed difference includes the engine speed difference at the first moment, the engine speed difference at the second moment, and the engine speed difference at the third moment. The first moment is later than the second moment, and the second moment is later than the third moment. Among them, the first moment is the current moment k, the second moment k - 1 is the previous moment of the current moment k, and the third moment k - 2 is the previous moment of the second moment k - 1, that is, the first two moments before the current moment.

[0054] The hybrid vehicle determines the clutch target pressure according to the obtained target increment control coefficient and the engine speed difference. Specifically, the hybrid vehicle calculates the first difference between the engine speed difference at the first moment and the engine speed difference at the second moment, and calculates the second difference between the engine speed difference at the first moment and the engine speed difference at the second moment multiplied by a preset multiple; calculates the sum of the speeds between the second difference and the engine speed difference at the third moment; sums up the product of the calculated proportional control coefficient and the first difference, the product of the integral control coefficient and the engine speed difference at the first moment, and the product of the differential control coefficient and the sum of the speeds, to obtain the clutch target pressure. It should be noted that the value range of the clutch target pressure is [0, 15] bar.

[0055] Among them, the calculation of the clutch target pressure satisfies the following formula:

[0056] P CluReq (k) = Kp · [e(k) - e(k - 1)] + k i · e(k) + k d · [e(k) - 2e(k - 1) + e(k - 2)]

[0057] Wherein, K p is the proportional control coefficient of the incremental PID controller, k i is the integral control coefficient of the incremental PID controller, k d is the derivative control coefficient of the incremental PID controller, e(k) is the difference between the engine start target speed and the actual engine speed at time k, e(k - 1) is the difference between the engine start target speed and the actual engine speed at time k - 1, e(k - 2) is the difference between the engine start target speed and the actual engine speed at time k - 2, e(k) - e(k - 1) is the first difference, e(k) - 2e(k - 1) is the second difference, and e(k) - 2e(k - 1) + e(k - 2) is the speed sum.

[0058] Step S230, determine the target current of the clutch control valve according to the clutch target pressure and the transmission oil temperature.

[0059] The hybrid vehicle can determine the target current of the clutch control valve from a preset ammeter according to the clutch target pressure and the transmission oil temperature. Among them, the preset ammeter includes the corresponding relationship between the clutch target pressure, the transmission oil temperature, and the target current of the clutch control valve. It should be noted that the preset ammeter can be constructed by the clutch target pressure, the transmission oil temperature, and the target current of the clutch control valve determined through bench tests.

[0060] It can be seen that the engine abnormal start control method based on the hybrid vehicle in the embodiment of the present application calculates the engine speed difference between the engine start target speed and the actual engine speed; determines the target current of the clutch control valve according to the clutch target pressure determined by the obtained target incremental control coefficient and the engine speed difference. Thus, determining the target current through the target incremental control coefficient can avoid the overshoot phenomenon of the incremental PID controller, the risk that the clutch overheating phenomenon causes the clutch to burn out, resulting in the failure of the engine abnormal start control function, and further leading to the problem that the hybrid vehicle completely loses power.

[0061] Based on the above embodiments, the embodiment of the present application uses Figure 3 the flowchart shown to elaborate in detail how to determine the engine start target speed. Please refer to Figure 3 , Figure 3 which Figure 1 is a schematic flowchart of an exemplary embodiment of step 110 in the engine abnormal start control method based on the hybrid vehicle. Specifically, the method of this embodiment includes the following steps:

[0062] Step S310: Determine the initial engine starting speed according to the engine water temperature from a preset initial engine starting speed table.

[0063] In the embodiment of the present application, before the process of determining the initial engine starting speed according to the engine water temperature from the preset initial engine starting speed table, the hybrid vehicle can determine whether the abnormal engine starting state is an active state according to the collected vehicle information. Exemplarily, the collected information includes the remaining battery power, limp-home mode, engine fault level, engine state, clutch speed difference between the rotational speed of the clutch driving disc and the rotational speed of the clutch driven disc, transmission oil temperature, clutch disc temperature, and clutch system fault state. The hybrid vehicle determines whether the remaining battery power is less than or equal to a preset battery threshold, whether the limp-home mode is an active mode, whether the engine fault level is a preset fault level, whether the engine state is a stopped state, whether the clutch speed difference is less than or equal to a preset clutch speed threshold, whether the transmission oil temperature is less than or equal to a preset oil temperature threshold, whether the clutch disc temperature is less than or equal to a preset temperature threshold, and whether the clutch system fault state is a fault-free state. In response to the remaining battery power being less than or equal to the preset battery threshold, the limp-home mode being an active mode, the engine fault level being a preset fault level, the engine state being a stopped state, the clutch speed difference being less than or equal to the preset clutch speed threshold, the transmission oil temperature being less than or equal to the preset oil temperature threshold, the clutch disc temperature being less than or equal to the preset temperature threshold, and the clutch system fault state being a fault-free state, it is determined that the abnormal engine starting state is an active state. It should be noted that if any of the above conditions is not met, the abnormal engine starting state is set to a frozen state. Additionally, it should be noted that if the transmission oil temperature detected in real time during the abnormal engine starting process of the hybrid vehicle is greater than or equal to the preset oil temperature or the clutch disc temperature is greater than or equal to the preset temperature, the abnormal engine starting state is set to a frozen state. Wherein, the preset temperature is 350 degrees, and the preset oil temperature is 120 degrees.

[0064] When the abnormal engine starting state of the hybrid vehicle is an active state, the initial engine starting speed is determined according to the engine water temperature from a preset initial engine starting speed table. Among them, the initial engine starting speed table includes the corresponding relationship between the engine water temperature and the initial engine starting speed. It should be noted that the preset initial engine starting speed table is constructed based on the engine water temperature and the initial engine starting speed determined through bench testing.

[0065] Step S320: Determine the target gradient value for adjusting the initial engine starting speed according to the actual engine speed and the transmission oil temperature from a preset speed gradient table.

[0066] The rotation speed gradient table includes the corresponding relationship among the actual engine speed, the gearbox oil temperature, and the target gradient value. Among them, the target gradient value is used to perform gradient processing on the initial engine start speed, and the target gradient value includes an ascending gradient value or a descending gradient value. It should be noted that the rotation speed gradient table is constructed based on the actual engine speed, the gearbox oil temperature, and the target gradient value determined through bench tests.

[0067] Step S330: Perform gradient processing on the initial engine start speed according to the target gradient value to obtain the target engine start speed.

[0068] The hybrid vehicle adjusts the initial engine start speed according to the target gradient value to obtain the target engine start speed.

[0069] It can be seen that the engine start control method based on a hybrid vehicle in the embodiment of the present application determines the initial engine start speed from a preset initial engine start speed table according to the engine water temperature. The initial engine start speed table includes the corresponding relationship between the engine water temperature and the initial engine start speed; determines the target gradient value for adjusting the initial engine start speed from a preset rotation speed gradient table according to the actual engine speed and the gearbox oil temperature. The rotation speed gradient table includes the corresponding relationship among the actual engine speed, the gearbox oil temperature, and the target gradient value; performs gradient processing on the initial engine start speed according to the target gradient value to obtain the target engine start speed. Thereby, the target current of the clutch control valve for performing closed-loop control of the clutch speed can be accurately determined according to the obtained target engine start speed, and the abnormal start of the engine can be achieved in the state of generator failure, so as to improve the adaptability of the hybrid vehicle in the failure state and ensure the safety of the passengers and drivers.

[0070] On the basis of the above embodiments, to elaborate in detail the engine abnormal start control method based on a hybrid vehicle in the present application, the following Figure 4 flowchart is further described in detail as follows:

[0071] The hybrid vehicle collects vehicle signals and analyzes the collected vehicle signals, that is, Figure 4 the input signal collection and analysis in; calculates the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed according to the actual front drive motor speed, the hybrid system speed ratio, and the actual engine speed in the collected vehicle signals, that is, Figure 4Calculate the rotational speed difference between the driving and driven discs of the clutch, and then determine whether the abnormal engine start state is an active state based on the remaining battery power, limp-home mode, engine fault level, engine state, transmission oil temperature, clutch disc temperature, clutch system fault state in the collected information, and the calculated rotational speed difference between the driving and driven discs of the clutch; in response to the remaining battery power being less than or equal to the preset battery threshold, the limp-home mode being an active mode, the engine fault level being the preset fault level, the engine state being a stopped state, the clutch rotational speed difference being less than or equal to the preset clutch rotational speed threshold, the transmission oil temperature being less than or equal to the preset oil temperature threshold, the clutch disc temperature being less than or equal to the preset temperature threshold, and the clutch system fault state being a fault-free state, determine that the abnormal engine start state is an active state; then analyze the engine start target rotational speed based on the obtained actual engine rotational speed, engine water temperature, and transmission oil temperature, determine the target current of the clutch control valve based on the engine start target rotational speed and the actual engine rotational speed, and then perform closed-loop control of the clutch rotational speed based on the target current of the clutch control valve, and activate the engine start function during the process of determining the target current of the clutch control valve. Then, when the adjusted actual engine rotational speed is greater than or equal to 800 rpm and the engine start success flag status is an active state, set the abnormal engine start state to a success state and trigger the hybrid power system working state to enter the parallel mode; if the adjusted actual engine rotational speed is less than 800 rpm, jump to the determination step of the abnormal engine start activation state.

[0072] It should be further noted that the execution subject of the method for controlling abnormal engine start of a hybrid vehicle can be the hybrid vehicle, or can be executed by a terminal device, a server, or other processing devices in the hybrid vehicle. For example, the vehicle control unit HCU in the hybrid vehicle. In some possible implementation manners, the method for controlling abnormal engine start of a hybrid vehicle can be implemented by a processor calling computer-readable instructions stored in a memory.

[0073] Figure 5 is a block diagram of a hybrid vehicle shown in an exemplary embodiment of the present application. As Figure 5 shown, the exemplary hybrid vehicle 500 includes: an activation module 510, a target current determination module 520, an adjustment module 530, and an abnormal start success module. Specifically:

[0074] The activation module 510 is configured to, in response to the abnormal engine start state in the hybrid vehicle being an active state, determine the engine start target rotational speed based on the obtained actual engine rotational speed, engine water temperature, and transmission oil temperature.

[0075] The target current determination module 520 is configured to determine the target current of the clutch control valve based on the engine start target rotational speed and the actual engine rotational speed.

[0076] An adjustment module 530 is configured to adjust the actual engine speed according to a target current to obtain an adjusted actual engine speed.

[0077] An abnormal start success module 540 is configured to determine that the abnormal engine start state is a success state in response to the adjusted actual engine speed being greater than or equal to a preset speed threshold and the obtained engine start success flag bit state being an active state.

[0078] In this exemplary hybrid vehicle, in response to the abnormal engine start state in the hybrid vehicle being an active state, a target current of a clutch control valve is determined based on an engine start target speed and an actual engine speed; the actual engine speed is adjusted according to the target current; and then in response to the adjusted actual engine speed being greater than or equal to a preset speed threshold and the obtained engine start success flag bit state being an active state, it is determined that the abnormal engine start state is a success state. Thus, in the active state of the abnormal engine start state, a closed-loop control of the clutch speed is completed through the target current of the clutch control valve determined by the engine start target speed and the actual engine speed, so that the abnormal start of the engine can be realized in the generator failure state, thereby improving the adaptability of the hybrid vehicle in the failure state and ensuring the safety of the passengers and drivers.

[0079] Among them, the functions of each module can be referred to in the embodiments of the method for controlling abnormal engine start of a hybrid vehicle, and will not be elaborated here.

[0080] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of an embodiment of the hybrid vehicle of the present application. The hybrid vehicle 60 includes a memory 61 and a processor 62. The processor 62 is configured to execute program instructions stored in the memory 61 to implement the steps in any of the above embodiments of the method for controlling abnormal engine start of a hybrid vehicle. In a specific implementation scenario, the hybrid vehicle 60 may include, but is not limited to, a microcomputer and a server. In addition, the hybrid vehicle 60 may also include mobile devices such as a laptop computer and a tablet computer, which are not limited here.

[0081] Specifically, the processor 62 is used to control itself and the memory 61 to implement the steps in any of the above embodiments of the engine abnormal start control method based on a hybrid vehicle. The processor 62 can also be referred to as a CPU (Central Processing Unit). The processor 62 may be an integrated circuit chip with signal processing capabilities. The processor 62 can also be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. Additionally, the processor 62 can be implemented jointly by integrated circuit chips.

[0082] In the above solution, in response to the abnormal start state of the engine in the hybrid vehicle being the active state, the target current of the clutch control valve is determined based on the target engine start speed and the actual engine speed; then the actual engine speed is adjusted according to the target current; in response to the adjusted actual engine speed being greater than or equal to the preset speed threshold and the status of the obtained engine start success flag being the active state, it is determined that the abnormal start state of the engine is the successful state. Thus, in the active state of the abnormal start state of the engine, the clutch speed closed-loop control is completed through the target current of the clutch control valve determined by the target engine start speed and the actual engine speed, and the abnormal start of the engine can be achieved in the generator failure state to improve the adaptability of the hybrid vehicle in the failure state and ensure the safety of the passengers and drivers.

[0083] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of an embodiment of the computer-readable storage medium of the present application. The computer-readable storage medium 70 stores program instructions 71 that can be run by the processor, and the program instructions 71 are used to implement the steps in any of the above embodiments of the engine abnormal start control method based on a hybrid vehicle.

[0084] In the above solution, in response to the abnormal engine start state in the hybrid vehicle being the activation state, the target current of the clutch control valve is determined based on the target engine start speed and the actual engine speed; then, the actual engine speed is adjusted according to the target current; in response to the adjusted actual engine speed being greater than or equal to the preset speed threshold and the obtained engine start success flag bit state being the activation state, it is determined that the abnormal engine start state is the success state. Thus, in the activation state of the abnormal engine start state, the closed-loop control of the clutch speed is completed through the target current of the clutch control valve determined by the target engine start speed and the actual engine speed, enabling the abnormal start of the engine in the generator failure state, so as to improve the adaptability of the hybrid vehicle in the failure state and ensure the safety of the passengers and drivers.

[0085] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the methods described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0086] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. In addition, the embodiments of the present invention are not directed to any particular programming language.

[0087] In the specification provided herein, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. Similarly, in order to streamline the present invention and assist in understanding one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims following the specific implementation manners are hereby expressly incorporated into the specific implementation manners, where each claim itself serves as a separate embodiment of the present invention.

[0088] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into a module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive.

[0089] It should be noted that the above embodiments are illustrative of the present invention and not restrictive thereof, and alternative embodiments can be designed by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. An abnormal engine start control method for a hybrid vehicle, characterized in that, The method includes: In response to the abnormal start state of the engine in the hybrid vehicle being an active state, determining a target engine start speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature; Determining a target current of the clutch control valve according to the target engine start speed and the actual engine speed; Adjusting the actual engine speed according to the target current to obtain an adjusted actual engine speed; In response to the adjusted actual engine speed being greater than or equal to a preset speed threshold and the obtained engine start success flag status being an active state, determining that the abnormal engine start state is a success state; The step of determining a target current of the clutch control valve according to the target engine start speed and the actual engine speed includes: Calculating an engine speed difference between the target engine start speed and the actual engine speed; Determining a clutch target pressure according to the obtained target increment control coefficient and the engine speed difference; Determining a target current of the clutch control valve according to the clutch target pressure and the transmission oil temperature.

2. The method according to claim 1, characterized in that, The engine speed difference includes an engine speed difference at a first moment, an engine speed difference at a second moment, and an engine speed difference at a third moment, the first moment being later than the second moment, and the second moment being later than the third moment; the target increment control coefficient includes a proportional control coefficient, a differential control coefficient, and an integral control coefficient; The step of determining a clutch target pressure according to the obtained target increment control coefficient and the engine speed difference includes: Calculating a first difference between the engine speed difference at the first moment and the engine speed difference at the second moment, and calculating a second difference between the engine speed difference at the first moment and a preset multiple of the engine speed difference at the second moment; Calculating a speed sum between the second difference and the engine speed difference at the third moment; Performing a summation process on the product of the calculated proportional control coefficient and the first difference, the product of the integral control coefficient and the engine speed difference at the first moment, and the product of the differential control coefficient and the speed sum to obtain the clutch target pressure.

3. The method according to claim 1, wherein Before the step of determining a clutch target pressure according to the obtained target increment control coefficient and the engine speed difference, the method further includes: Obtaining the actual speed of the front drive motor and the hybrid system speed ratio; Calculating a clutch speed difference between the clutch driving disk speed and the clutch driven disk speed according to the actual speed of the front drive motor, the hybrid system speed ratio, and the actual engine speed; Determining a target increment control coefficient from a preset increment control coefficient table according to the clutch speed difference and the transmission oil temperature, where the preset increment control coefficient table includes the corresponding relationship between the clutch speed difference, the transmission oil temperature, and the target increment control coefficient.

4. The method according to claim 3, wherein The hybrid system speed ratio includes a front drive motor transmission speed ratio and an engine transmission speed ratio; The step of calculating the clutch speed difference between the clutch driving disk speed and the clutch driven disk speed according to the actual speed of the front drive motor, the speed ratio of the hybrid power system, and the actual speed of the engine includes: Calculating the ratio between the transmission speed ratio of the front drive motor and the actual speed of the front drive motor; Calculating the product between the ratio and the transmission speed ratio of the engine; Taking the difference between the product of the ratio and the transmission speed ratio of the engine and the actual speed of the engine as the clutch speed difference.

5. The method according to claim 1, wherein The step of determining the engine start target speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature includes: Determining the initial engine start speed from a preset initial engine start speed table according to the engine water temperature, where the initial engine start speed table includes the corresponding relationship between the engine water temperature and the initial engine start speed; Determining a target gradient value for adjusting the initial engine start speed from a preset speed gradient table according to the actual engine speed and the transmission oil temperature, where the target gradient value includes an increasing gradient value or a decreasing gradient value, and the speed gradient table includes the corresponding relationship between the actual engine speed, the transmission oil temperature, and the target gradient value; Performing gradient processing on the initial engine start speed according to the target gradient value to obtain the engine start target speed.

6. The method according to claim 1, wherein Before the step of determining the engine start target speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature, the method further includes: Collecting vehicle information, where the vehicle information includes the remaining battery power, limp home mode, engine fault level, engine status, clutch speed difference between the clutch driving disk speed and the clutch driven disk speed, transmission oil temperature, clutch disc temperature, and clutch system fault status; Responding to the remaining battery power being less than or equal to a preset battery threshold, the limp home mode being an active mode, the engine fault level being a preset fault level, the engine status being a stopped state, the clutch speed difference being less than or equal to a preset clutch speed threshold, the transmission oil temperature being less than or equal to a preset oil temperature threshold, the clutch disc temperature being less than or equal to a preset temperature threshold, and the clutch system fault status being a fault-free state, determining that the engine abnormal start state is an active state, where the limp home mode refers to the vehicle driving mode when the hybrid vehicle system fails.

7. The method according to claim 1, wherein The method further includes: Responding to the adjusted actual engine speed being less than the preset speed threshold, returning to the step of determining the engine start target speed according to the obtained actual engine speed, engine water temperature, and transmission oil temperature when the engine abnormal start state in the hybrid vehicle is an active state, and recording one jump. Until the total number of recorded jumps is greater than or equal to a preset number of jumps, set the engine start success flag bit to be frozen and trigger the fault flag bit to fail.

8. A hybrid vehicle, characterized in that, It includes a memory and a processor, and the processor is used to execute the program instructions stored in the memory to implement the method according to any one of claims 1 to 7.

9. A computer-readable storage medium having program instructions stored thereon, characterized in that, When the program instructions are executed by the processor, the method according to any one of claims 1 to 7 is implemented.

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