Starting method and device of hybrid power engine, vehicle and medium

Abstract

The invention discloses a starting method and device of a hybrid power engine, a vehicle and a medium, and relates to the technical field of vehicles. The method comprises the steps that whether the vehicle enters an emergency state or not is judged; the emergency state represents that the vehicle cannot enter a high-voltage working state; under the condition that it is confirmed that the vehicle enters the emergency state, power is supplied to a high-voltage system of the vehicle based on a low-voltage storage battery of the vehicle; according to the low-voltage starting parameters, an engine of the vehicle is controlled to be started; wherein the low-voltage starting parameter is smaller than the high-voltage starting parameter; the low-pressure starting parameters represent parameters required for starting an engine in a low-pressure working state; the high-pressure starting parameters represent parameters required for starting the engine in a high-pressure working state. By adopting the method, the engine can be started through the electric quantity output by the low-voltage storage battery under the condition that the high-voltage battery cannot work normally.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method, a device, a vehicle and a medium for starting a hybrid power engine. Background Art

[0002] In the related art, when a hybrid vehicle starts its engine, the high-voltage battery pack supplies power to the generator, which then drives the engine to start the engine. When the high-voltage battery pack cannot output power due to various reasons, such as failure or inability of the main relay to close, the engine cannot be started, resulting in the vehicle being unable to power on and drive. Summary of the invention

[0003] Based on this, it is necessary to provide a method, device, vehicle and medium for starting a hybrid engine that can start the engine when a high-voltage battery pack fails in order to solve the above technical problems.

[0004] A method for starting a hybrid engine, comprising:

[0005] Determine whether the vehicle enters an emergency state; the emergency state indicates that the vehicle cannot enter a high-voltage working state;

[0006] When confirming that the vehicle enters the emergency state, supplying power to the high-voltage system of the vehicle based on the low-voltage battery of the vehicle;

[0007] According to the low-pressure starting parameter, the engine start of the vehicle is controlled; wherein the low-pressure starting parameter is smaller than the high-pressure starting parameter; the low-pressure starting parameter represents the parameter required to start the engine under the low-pressure working state; the high-pressure starting parameter represents the parameter required to start the engine under the high-pressure working state.

[0008] In the above solution, controlling the engine start of the vehicle according to the low-voltage start parameter includes:

[0009] The engine is driven to rotate based on the generator of the vehicle;

[0010] When it is determined that the engine reaches the low-pressure starting parameter, the engine is controlled to ignite to start.

[0011] In the above scheme, the controlling the engine start of the vehicle according to the low-voltage starting parameter comprises:

[0012] The ignition speed is reduced from the first speed in the high-voltage starting parameter to the second speed, and the starting power is reduced from the first starting power in the high-voltage starting parameter to the second starting power.

[0013] In the above solution, the low-voltage battery is provided with a power supply interface for connecting to an external power supply, and the method further comprises:

[0014] If the engine cannot be started, the engine is started according to the output power of the low-voltage battery and the output power of the power supply interface.

[0015] In the above scheme, the method further includes:

[0016] The low-voltage battery is charged based on an external power source connected to the power supply interface.

[0017] In the above solution, the low-voltage battery of the vehicle supplies power to the high-voltage system of the vehicle, including:

[0018] The bidirectional DC-DC converter of the vehicle is controlled to convert the low-voltage direct current of the low-voltage battery into high-voltage direct current.

[0019] In the above solution, the step of determining whether the vehicle enters an emergency state includes:

[0020] The output capacity of the high-voltage battery pack of the vehicle is detected, and whether the low-voltage battery and the low-voltage system are operating normally is detected.

[0021] A hybrid engine starting device, comprising:

[0022] A judgment module, used to judge whether the vehicle enters an emergency state; the emergency state indicates that the vehicle cannot enter a high-voltage working state;

[0023] A power supply module, configured to supply power to a high-voltage system of the vehicle based on a low-voltage battery of the vehicle when confirming that the vehicle enters the emergency state;

[0024] A starting module is used to control the engine start of the vehicle according to a low-pressure starting parameter; wherein the low-pressure starting parameter is less than the high-pressure starting parameter; the low-pressure starting parameter represents the parameter required to start the engine under a low-pressure working state; the high-pressure starting parameter represents the parameter required to start the engine under a high-pressure working state.

[0025] A hybrid vehicle comprises a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the method for starting the hybrid engine is implemented.

[0026] A computer-readable storage medium stores a computer program, which implements the hybrid engine starting method when executed by a processor.

[0027] The hybrid engine starting method, device, vehicle and medium judge whether the vehicle has entered an emergency state, and when the vehicle has entered an emergency state, the vehicle's low-voltage battery supplies power to the vehicle's high-voltage system, thereby using the low-voltage battery for reverse power supply to start the engine. The vehicle's engine start is then controlled based on the low-voltage starting parameter, wherein the low-voltage starting parameter is less than the high-voltage starting parameter, so that the vehicle can ensure smooth engine start even when the low-voltage battery output capacity is limited, thereby improving the reliability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic flow chart of a method for starting a hybrid engine in one embodiment;

[0029] Figure 2 A control block diagram of a vehicle in an emergency state in one embodiment;

[0030] Figure 3 A circuit topology diagram of a hybrid vehicle in an emergency state in one embodiment;

[0031] Figure 4 A schematic diagram of a flow chart of starting an engine based on a generator in an embodiment;

[0032] Figure 5 A schematic diagram of the relationship between engine startup parameters in one embodiment;

[0033] Figure 6 A decision logic diagram for engine start in one embodiment;

[0034] Figure 7 1 is a structural block diagram of a method for starting a hybrid engine in one embodiment. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] The implementation details of the technical solution of the embodiment of the present application are described in detail below.

[0037] In one embodiment, Figure 1 As shown, a method for starting a hybrid engine is provided, and the method may include the following steps:

[0038] Step S101, determining whether the vehicle enters an emergency state.

[0039] The emergency state means that the vehicle cannot enter the high-voltage working state, that is, the vehicle cannot start the engine through the high-voltage battery pack. Under normal circumstances, the vehicle's high-voltage battery pack and high-voltage system work normally, and the vehicle enters the high-voltage working state. In the high-voltage working state, it can provide power for the vehicle's high-voltage equipment. In actual applications, the high-voltage battery pack may not be able to output power normally due to battery aging, short circuit, overcharge, over-discharge or other electrical faults, resulting in the vehicle being unable to enter the high-voltage working state. Since the high-voltage battery pack cannot provide electricity, the engine and other high-voltage equipment cannot work normally, causing the entire vehicle to lose power.

[0040] In this embodiment, it is necessary to determine whether the vehicle enters an emergency state, so as to determine whether the vehicle uses a high-voltage battery pack to start the engine or uses an emergency mode to start the engine.

[0041] In one embodiment, determining whether the vehicle enters an emergency state includes: detecting the output capacity of the high-voltage battery pack of the vehicle, and detecting whether the low-voltage battery and the low-voltage system are operating normally.

[0042] The purpose of testing the output capacity of the vehicle's high-voltage battery pack is to determine whether the high-voltage battery pack can provide normal power supply. If the high-voltage battery pack can output power, the high-voltage battery pack is used to power the vehicle, so that the engine can be started through the high-voltage battery pack. If the high-voltage battery pack cannot output power, the entire vehicle cannot be high-voltage, and the engine cannot be started through the high-voltage battery pack. At this time, you can consider using the vehicle's low-voltage battery for reverse power supply to start the engine. The premise of using a low-voltage battery to start the engine is that the vehicle's low-voltage battery and low-voltage system can work normally. Based on this, it is also necessary to perform a self-inspection of the low-voltage battery and low-voltage system to determine whether the vehicle's low-voltage battery and low-voltage system can work normally.

[0043] When it is determined that the vehicle's high-voltage battery pack cannot output power and the vehicle's low-voltage battery and low-voltage system can operate normally, the emergency state is activated and the vehicle is determined to have entered the emergency state.

[0044] Step S102: When it is confirmed that the vehicle enters an emergency state, power is supplied to the high-voltage system of the vehicle based on the low-voltage battery of the vehicle.

[0045] In an emergency situation, the high-voltage battery pack cannot output power. At this time, it is necessary to rely on the low-voltage battery to provide the necessary power support for the high-voltage system. The low-voltage battery serves as a backup power source to supply power to the vehicle's high-voltage system. The high-voltage system generally refers to the high-voltage equipment in the vehicle. These high-voltage equipment can drive the operation of the engine, thereby enabling the engine to be started through the output power of the low-voltage battery.

[0046] Among them, Figure 2 As shown, Figure 2The control block diagram of the vehicle in an emergency state is shown. After entering the emergency state, the vehicle will start by driving the engine ignition through the generator by implementing a bidirectional DC-DC converter reverse boost, lowering the ignition speed, and connecting the power supply interface to an external power supply. The specific processing flow after the vehicle enters the emergency state will be described in detail below through different embodiments.

[0047] In one embodiment, Figure 3 As shown, Figure 3 The circuit topology of a hybrid vehicle in an emergency state is shown. The circuit includes a bidirectional DC-DC converter. A bidirectional DC-DC converter is a power electronic device that can convert energy between two DC voltages. It can boost the low voltage of the low-voltage battery to the high voltage required by the high-voltage system. This process enables the low-voltage battery to output sufficient power to support the working requirements of the high-voltage system. Using the power boosted by the bidirectional DC-DC converter, the low-voltage battery can drive the high-voltage system to start the engine, thereby ensuring that the vehicle still has the ability to start when the high-voltage battery pack cannot provide power.

[0048] Step S103, controlling the vehicle engine to start according to the low-voltage starting parameters.

[0049] The engine needs to meet certain parameters when starting to ensure successful engine ignition and overcome static friction, so as to ensure that the engine can enter a normal working state. In an emergency state, the vehicle controls the engine start of the vehicle according to the low-pressure starting parameters, where the low-pressure starting parameters refer to the parameters required to start the engine under low-pressure working conditions, that is, the vehicle controls the engine to at least reach the low-pressure starting parameters, so that the engine can ignite smoothly and operate normally.

[0050] It should be noted that the output power of the low-voltage battery is usually lower than the output power of the high-voltage battery pack, so the operation of the engine in the high-voltage working state is different from that in the low-voltage working state. For example, the speed of the engine in the high-voltage working state will be higher than the speed in the low-voltage working state. Therefore, if the parameters required to start the engine in the high-voltage working state (i.e., high-voltage starting parameters) are used as the conditions for starting the engine in the low-voltage working state, the engine will be difficult to start. Based on this, considering that the performance requirements of the vehicle for the engine in the low-voltage working state will be lower than the performance requirements of the vehicle for the engine in the high-voltage working state, in the process of starting the engine in the low-voltage working state, the low-voltage starting parameters will be less than the parameters required to start the engine in the high-voltage working state (high-voltage starting parameters), making it easier for the engine to reach the starting conditions in the low-voltage working state, thereby ensuring that the engine can start smoothly in the low-voltage working state.

[0051] In one embodiment, Figure 4As shown, Figure 4 A schematic diagram of the process of starting the engine based on generator dragging is shown.

[0052] Step S201, the generator of the vehicle drives the engine to rotate.

[0053] Step S202, when it is determined that the engine reaches the low-pressure starting parameter, control the engine ignition to start.

[0054] refer to Figure 3 As shown in the circuit topology diagram, the high-voltage system includes a generator. When the engine is started under low-voltage working conditions, the low-voltage battery supplies power to the generator, and the rotation of the generator is started through the motor controller, and the generator can convert electrical energy into mechanical energy. The rotation of the generator is connected to the engine through a mechanical connection (such as a belt or gear). The electrical energy provided by the low-voltage battery enables the generator to generate sufficient torque, so that the generator can drive the crankshaft of the engine to rotate.

[0055] After the engine successfully drives the engine to rotate, the vehicle will monitor the engine's rotation in real time to determine whether the engine has reached the low-pressure starting parameters, thereby determining the ignition timing. The ignition timing refers to the specific moment in the engine's working cycle when the ignition system is in operation. By determining the ignition timing, it can ensure that the mixed gas (air and fuel) is ignited at the appropriate time. Once it is confirmed that the engine has reached the low-pressure starting parameters, indicating that it is at the best ignition timing, the vehicle controller sends an ignition signal to the engine, instructing the engine to ignite, so that the ignition system will activate the spark plug, generate an arc to ignite the mixed gas in the cylinder. This process is a key step in starting the engine, ensuring that the engine can smoothly enter the working state, perform the working cycle, and complete the engine start.

[0056] It should be noted that in this embodiment, the engine is driven to rotate by the generator, avoiding the use of a drive motor with a disengagement device, which can more effectively utilize electrical energy, provide a higher starting torque, and reduce the design cost of the engine starting system.

[0057] In one embodiment, parameters related to engine starting include ignition speed and starting power, wherein the ignition speed refers to the minimum speed required for the engine to reach ignition during the starting process, and this speed is a key parameter for the engine to successfully ignite the mixture in the cylinder; starting power refers to the power required during the engine starting process, which is used to overcome the delicate inertia and internal friction of the engine.

[0058] In practical applications, the ignition speed of a hybrid engine is usually set to be greater than that of the engine of a fuel-powered vehicle, taking into account issues such as noise, vibration, and roughness. As the ignition speed increases, the starting power requirement of the hybrid engine also increases accordingly.

[0059] Since the output power of the low-voltage battery is low, the higher ignition speed and starting power are not suitable for the application scenario of starting the engine in the low-voltage working state. Based on this, in this embodiment, in an emergency state, it is necessary to set the engine starting parameters from the high-voltage starting parameters to the low-voltage starting parameters. Figure 5 As shown, Figure 5 The relationship diagram of engine starting parameters is shown in Figure 5 The difference in power demand and ignition speed when the engine is started in the high-voltage working state and the low-voltage working state can be determined, wherein the power demand and ignition speed when the engine is started in the low-voltage working state are lower than the power demand and ignition speed when the engine is started in the high-voltage working state.

[0060] In an emergency, the vehicle controller needs to reduce the ignition speed from the first speed (such as 1200rpm) under the high-pressure working state to the second speed (such as 200rpm). Reducing the ignition speed to the second speed can reduce the energy demand when the engine is started, ensuring that the engine can still start smoothly under the low-pressure working state.

[0061] The vehicle controller also needs to adjust the starting power from the first power (such as 2.5KW) under the high-voltage working state to the second power (such as less than 1KW). As the ignition speed decreases, the starting power of the engine also decreases accordingly, which means that in an emergency state, the power required by the engine is greatly reduced. This power level is sufficient to overcome the static friction and inertia of the engine, ensuring that the engine can start without relying on the output of the high-voltage battery pack.

[0062] After the vehicle controller completes the setting of the low-voltage starting parameters, the vehicle controller will continue to monitor whether the engine speed and power reach the low-voltage starting parameters, thereby controlling the engine ignition to start.

[0063] In one embodiment, reference Figure 3 As shown in the circuit topology diagram, the vehicle's low-voltage battery is also equipped with a power supply interface for connecting to an external power source. The low-voltage battery has reserved a wiring port in the form of lead-out wiring for the external power source to connect.

[0064] In actual applications, when the vehicle is in extremely low temperature weather, or the low-voltage battery is low in power due to other reasons, the low-voltage battery may not provide enough power to start the engine. In this case, an external power supply can be connected through the power supply interface, and the output power of the external power supply is used to supplement the starting power, thereby ensuring the smooth start of the engine under the combined effect of the output power of the low-voltage battery and the output power of the power supply interface.

[0065] In one embodiment, the power supply interface of the low-voltage battery can also be used for emergency replenishment of the low-voltage battery power. After the power supply interface is connected to an external power source, the external power source can charge the low-voltage battery through the power supply interface, thereby ensuring the power of the low-voltage battery. In practical applications, considering that the power supply interface has the function of replenishing the power of the low-voltage battery, the power supply interface is generally arranged outside the vehicle in an area that is easy for the driver to access, such as at the spiral mouth of the front / rear trailer hook. When using the power supply interface, the driver only needs to pry open the small baffles on the front and rear bumpers to easily access the power supply interface, and then connect the external power source in parallel through the charging interface to provide low-voltage power to the low-voltage battery.

[0066] Based on the above embodiments, Figure 6 As shown, Figure 6 The decision logic diagram for engine start is shown.

[0067] The engine start process starts with the vehicle being powered on. Powering on the vehicle means that the vehicle's electrical system is activated and ready for various operations and functions, indicating that the engine is ready to enter the starting state.

[0068] Then the power supply status is judged, including low voltage self-test and high voltage power-on test. Low voltage self-test refers to the detection of the status of the low voltage battery and the operating status of the low voltage system. High voltage power-on test is used to determine whether the high voltage battery pack can output power to supply power to the vehicle normally.

[0069] If the low-voltage self-test indicates that the low-voltage battery and low-voltage system are normal, and the high-voltage battery pack is normal, the vehicle will enter normal working state, and the vehicle will start the engine according to the high-voltage battery pack. If the low-voltage self-test indicates that the low-voltage battery and low-voltage system are normal, but the high-voltage battery pack is abnormal, it means that the high-voltage battery pack cannot supply power to the vehicle, resulting in the engine being unable to start, and the vehicle will enter an emergency state.

[0070] In an emergency, the vehicle uses the low-voltage battery to reverse power and output power to drive the generator to start the engine.

[0071] Among them, the low voltage output by the low-voltage battery is converted into a high voltage through a bidirectional DC-DC converter to power the high-voltage system in the vehicle. At the same time, the vehicle controller lowers the ignition speed, and as the ignition speed is lowered, the starting power is also lowered accordingly. Based on this, the engine is started through the reverse power supply of the bidirectional DC-DC converter and the lowered ignition speed. Specifically, the high voltage output by the bidirectional DC-DC converter can power the generator, so that the generator can drive the engine to rotate, and the engine will start when the ignition speed and starting power are reached.

[0072] After achieving reverse power supply and lowering the ignition speed, it is necessary to monitor whether the engine can start. If the engine still cannot start, the external power supply connected through the power supply interface of the low-voltage battery will reversely supply power to the high-voltage system under the joint action of the low-voltage battery and the external power supply.

[0073] In the above embodiment, it is judged whether the vehicle enters an emergency state to determine whether the high-voltage battery pack of the vehicle can supply power normally. When it is confirmed that the vehicle enters an emergency state, the vehicle's high-voltage system is supplied with power based on the vehicle's low-voltage battery to ensure that the vehicle's high-voltage system can operate normally, and then the vehicle's engine is controlled to start according to the low-voltage starting parameter, wherein the low-voltage starting parameter is less than the high-voltage starting parameter, so that the engine starting parameter is adjusted to a scenario suitable for the current low-voltage working state, so that the engine can be started smoothly in the low-voltage working state, ensuring the normal driving of the vehicle.

[0074] In one embodiment, a hybrid engine starting device is provided, referring to Figure 7 As shown, the hybrid engine starting device 700 may include: a determination module 701 , a power supply module 702 and a starting module 703 .

[0075] Among them, the judgment module 701 is used to judge whether the vehicle enters an emergency state; the emergency state indicates that the vehicle cannot enter a high-voltage working state;

[0076] The power supply module 702 is used to supply power to the high-voltage system of the vehicle based on the low-voltage battery of the vehicle when it is confirmed that the vehicle enters an emergency state;

[0077] The starting module 703 is used to control the engine start of the vehicle according to the low-pressure starting parameter; wherein the low-pressure starting parameter is less than the high-pressure starting parameter; the low-pressure starting parameter represents the parameter required to start the engine under the low-pressure working state; the high-pressure starting parameter represents the parameter required to start the engine under the high-pressure working state.

[0078] In one embodiment, the starting module 703 is specifically used to drive the engine to rotate based on the generator of the vehicle;

[0079] When it is determined that the engine reaches the low-pressure starting parameter, the engine ignition is controlled to start.

[0080] In one embodiment, the starting module 703 is specifically configured to reduce the ignition speed from a first speed in the high-voltage starting parameter to a second speed, and reduce the starting power from a first starting power in the high-voltage starting parameter to a second starting power.

[0081] In one embodiment, the starting module 703 is also used to start the engine according to the output power of the low-voltage battery and the output power of the power supply interface if the engine cannot be started.

[0082] In one embodiment, the start-up module 703 is further used to charge the low-voltage battery based on an external power source connected to the power supply interface.

[0083] In one embodiment, the power supply module 702 is specifically used to control the bidirectional DC-DC converter of the vehicle to convert the low-voltage direct current of the low-voltage battery into high-voltage direct current.

[0084] In one embodiment, the judgment module 701 is specifically used to detect the output capacity of the high-voltage battery pack of the vehicle, and to detect whether the low-voltage battery and the low-voltage system are working normally.

[0085] The specific definition of the hybrid engine starting device 700 can refer to the definition of the hybrid engine starting method above, which will not be repeated here. Each module in the hybrid engine starting device 700 can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0086] In one embodiment, a hybrid vehicle is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements a method for starting a hybrid engine when executing the computer program.

[0087] In one embodiment, a computer storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, a method for starting a hybrid engine is implemented.

[0088] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0089] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for starting a hybrid engine, characterized in that: include: Determine whether the vehicle is in an emergency state; The emergency state indicates that the vehicle cannot enter a high-voltage working state; When confirming that the vehicle enters the emergency state, supplying power to the high-voltage system of the vehicle based on the low-voltage battery of the vehicle; According to the low-pressure starting parameter, the engine start of the vehicle is controlled; wherein the low-pressure starting parameter is smaller than the high-pressure starting parameter; the low-pressure starting parameter represents the parameter required to start the engine under the low-pressure working state; the high-pressure starting parameter represents the parameter required to start the engine under the high-pressure working state.

2. The startup method according to claim 1, characterized in that: The controlling the engine start of the vehicle according to the low-voltage start parameter comprises: The engine is driven to rotate based on the generator of the vehicle; When it is determined that the engine reaches the low-pressure starting parameter, the engine is controlled to ignite to start.

3. The startup method according to claim 1 or 2, characterized in that: The controlling the engine start of the vehicle according to the low-voltage starting parameter comprises: The ignition speed is reduced from the first speed in the high-voltage starting parameter to the second speed, and the starting power is reduced from the first starting power in the high-voltage starting parameter to the second starting power.

4. The startup method according to claim 1, characterized in that: The low-voltage battery is provided with a power supply interface for accessing an external power supply, and the method further comprises: If the engine cannot be started, the engine is started according to the output power of the low-voltage battery and the output power of the power supply interface.

5. The startup method according to claim 4, characterized in that: The method further comprises: The low-voltage battery is charged based on an external power source connected to the power supply interface.

6. The startup method according to claim 1, characterized in that: The low-voltage battery based on the vehicle supplies power to the high-voltage system of the vehicle, comprising: The bidirectional DC-DC converter of the vehicle is controlled to convert the low-voltage direct current of the low-voltage battery into high-voltage direct current.

7. The startup method according to claim 1, characterized in that: The determining whether the vehicle enters an emergency state includes: The output capacity of the high-voltage battery pack of the vehicle is detected, and whether the low-voltage battery and the low-voltage system are operating normally is detected.

8. A hybrid engine starting device, characterized in that: include: A judgment module, used to judge whether the vehicle enters an emergency state; The emergency state indicates that the vehicle cannot enter a high-voltage working state; A power supply module, configured to supply power to a high-voltage system of the vehicle based on a low-voltage battery of the vehicle when confirming that the vehicle enters the emergency state; A starting module is used to control the engine start of the vehicle according to a low-pressure starting parameter; wherein the low-pressure starting parameter is less than the high-pressure starting parameter; the low-pressure starting parameter represents the parameter required to start the engine under a low-pressure working state; the high-pressure starting parameter represents the parameter required to start the engine under a high-pressure working state.

9. A hybrid vehicle, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the method for starting the hybrid engine according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for starting the hybrid engine according to any one of claims 1 to 7 is implemented.

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