CN117622096A

CN117622096A - Intelligent power protection control method and system for hybrid electric vehicle

Info

Publication number: CN117622096A
Application number: CN202311311741.7A
Authority: CN
Inventors: 唐香蕉; 赖明聪; 高祖成; 罗少华
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2023-10-11
Filing date: 2023-10-11
Publication date: 2024-03-01

Abstract

The invention relates to the technical field of automobile engineering, comprising the steps of judging the SOC value of a battery in forced series connection according to the information of the ambient temperature, the driving requirement and the battery state, limiting the speed of the whole automobile and lighting a tortoise speed lamp according to the starting condition and failure times of an engine, judging whether to limit the driving torque requirement, the power of a battery and an air conditioner according to the SOC value of the battery, and increasing the torque closed loop fault identification. The method provides an intelligent power protection control strategy under the condition that the SOC of a power battery of a hybrid electric vehicle is too low, and through judging the SOC of the power battery, different power SOC is too low, different power protection strategies are adopted, so that the effect of protecting the battery to the maximum extent is achieved, the service life of the battery is prolonged, the torque closed loop fault recognition function is increased, the high-voltage electricity is prevented from being excessively consumed due to repeated starting of an engine, and the operations of lighting a turtle speed indicator lamp, a low-power battery fault lamp, actively powering down the high-voltage electricity and the like are increased in the intelligent power protection control process.

Description

Intelligent power protection control method and system for hybrid electric vehicle

Technical Field

The invention relates to the technical field of automobile engineering, in particular to an intelligent electricity protection control method of a hybrid electric vehicle.

Background

The hybrid electric vehicle is powered by the power battery, and the excessive consumption of the power battery can cause the over-discharge and the power shortage of the power battery in the running process or the stationary state of the vehicle, so that the hybrid electric vehicle can not be started normally, and the service life of the power battery is reduced. In order to effectively avoid battery damage of a power battery of a hybrid electric vehicle caused by power deficiency, and improve the service life of the power battery, the prior art generally adopts the method of detecting the residual electric quantity of the power battery in real time, charges the power battery in a power deficiency state, ensures that the vehicle can be started normally, but starts a charging function under the condition of being lower than a fixed threshold value, does not consider the influence of external factors such as temperature, and sends an alarm signal to a vehicle owner in time when the residual oil quantity of the vehicle is lower, and has the problems that the actual residual electric quantity of the power battery is too low or the charging function cannot be started normally when an engine and other systems are in fault, and the like, so that the protection of the power battery is not facilitated.

Disclosure of Invention

The present invention has been made in view of the above-described problems occurring in the prior art.

Therefore, the invention provides an intelligent power-saving control method of a hybrid electric vehicle, which can realize different control strategies for the residual electric quantity in stages by monitoring the SOC of a power battery of the vehicle and combining the factors such as the ambient temperature, the power consumption requirement of a driver and the like.

In order to solve the technical problems, the invention provides the following technical scheme, namely an intelligent electricity protection control method of a hybrid electric vehicle, which comprises the following steps: and judging the SOC value of the battery in forced series connection according to the information of the environment temperature, the driving requirement and the battery state, limiting the speed of the whole vehicle according to the starting condition and failure times of the engine, and igniting a tortoise speed lamp, judging whether to limit the driving torque requirement and the power of the battery and an air conditioner according to the SOC value of the battery, and increasing the torque closed loop fault identification.

As a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the information of the environment temperature, the driving requirement and the battery state comprises that when the environment temperature is higher than-5 ℃ and no warm air conditioner requirement exists, the system with the SOC lower than 40% of the SOC of the power battery forcedly starts the engine, and the engine enters a series mode, and when the environment temperature is lower than-5 ℃ or the warm air conditioner requirement exists, the system with the SOC lower than 55% of the SOC of the power battery forcedly starts the engine and enters the series mode.

As a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the battery SOC value during forced series connection comprises that under the normal temperature state, when the battery SOC is lower than 40%, the engine is forced to start into a series connection mode, and when the environment temperature is lower than-5 ℃ or the requirement of warm air and air conditioning exists, the SOC critical value is adjusted to 55%;

when the continuous start of the engine fails for 3 times, the turtle-speed lamp is turned on to limit the speed of the whole vehicle, when the battery SOC is lower than 30%, the turtle-speed lamp is continuously turned on, the HCU of the whole vehicle does not respond to the driving torque demand, when the battery SOC is lower than 25%, the HCU limits the battery/air conditioner power, when the battery SOC is lower than 20% and no charging current is continuous for more than 1s, the BMS actively drops high voltage and reports faults, and the diagnosis instrument is required to clear the BMS fault code to normally go up the high voltage.

As a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the speed limiting of the whole vehicle comprises the steps of triggering a first-level fault of a system, turning on a turtle-speed lamp in an indicator lamp instrument to request the engine to stop if the engine is started for 1 time after failure in the forced series connection process, triggering a second-level fault to request the engine to stop when the engine is started for 3 times continuously and failed, prohibiting the engine from being started, and limiting the speed of the whole vehicle.

As a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the judging according to the battery SOC comprises the steps that the HCU reduces the output power of an engine and reduces the rotating speed of a motor by controlling the output of the engine and the motor according to the current battery SOC state;

the air speed of the air conditioner is reduced, the refrigerating/heating effect of the air conditioner is reduced by controlling the operation of the air conditioning system, meanwhile, the working mode of the air conditioning system is optimized, and the energy efficiency of the air conditioning system is improved by utilizing the residual electric quantity of the battery.

As a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the fault identification of the closed loop of the increased torque comprises the steps of state diagnosis of a hybrid power control unit, actual steady-state torque detection and duration detection of a motor and an engine, judging the fault type according to the diagnosis detection result and taking corresponding measures;

as a preferable scheme of the intelligent electricity protection control method of the hybrid electric vehicle, the invention comprises the following steps: the state diagnosis of the hybrid power control unit comprises motor fault detection, engine fault detection, forced shutdown request or not, engine shutdown request or not of the electronic control unit, operation request for reducing fuel consumption sent by the hybrid power control unit or not, detection of whether an engine is started or not and detection of a light-off zone indicator lamp of the engine;

the motor, the actual steady-state torque detection of the engine and the duration detection comprise that the motor torque is larger than 5 N.m, the actual steady-state torque of the engine is larger than or equal to 15 N.m, the duration is larger than 30s, the three conditions are met simultaneously, a first-level fault is triggered, the engine is requested to stop, a tortoise speed lamp in an indicator lamp instrument is lightened, the speed limit is 30km/h, the fault occurrence frequency is increased by one counting unit, and the previous step is circulated;

the fault type is judged according to the diagnosis detection result, and corresponding measures are taken, wherein when the counting unit is more than or equal to 3, a secondary fault is triggered, the engine is requested to stop, the engine is forbidden to be automatically powered on again and then released, after the power battery is excessively low, the system actively outputs high voltage, and after a fault code of a battery management system is cleared by a diagnostic instrument, the system returns to normal high voltage;

setting the SOC value of the battery as S and the driving torque requirement as tau _d Battery power P _b The air conditioner power is P _a Torque closed loop fault is identified as τ _e By a function h (S, τ _d ,P _b ,P _a ,τ _e ) The influence of the battery SOC value on driving torque demand, power of the battery and an air conditioner and torque closed loop fault identification are expressed, when S is less than or equal to a set value,then it is indicated that the battery SOC value is too low and the driving torque demand is limited to τ _d X 0.5, battery power P _b X 0.8, air conditioner power P _a X 0.6, and increasing torque closed loop fault identification as τ _e +0.1Nm/kgm ² /s ² ；

When S is larger than or equal to the set value, the battery SOC value is too high, and the driving torque requirement, the battery power, the air conditioner power or the increased torque closed loop fault identification is not required to be limited.

Another object of the present invention is to provide a system for an intelligent power protection control method of a hybrid vehicle, which can minimize energy consumption and improve battery life while ensuring vehicle running performance.

The intelligent electricity protection control method of the hybrid electric vehicle is characterized in that: the system comprises an air conditioner control module, an engine management module, an indicator light instrument and a battery management module.

The air conditioner control module is used for intelligently adjusting the working state of the air conditioner system according to the temperature and humidity requirements in the vehicle and the load condition of the vehicle in the running process of the vehicle so as to reduce energy consumption.

The engine management module optimizes the working state of the engine according to the running working conditions of the vehicle, including acceleration, deceleration and cruising, realizes the balance of fuel economy and power performance, and when the vehicle brakes, the engine management system also works cooperatively with the braking system to convert part of braking energy into electric energy to be stored in the battery, thus realizing energy recovery.

The indicator light instrument can display real-time states of the vehicle, including driving modes, battery power and oil consumption information, and helps a driver to know the running condition of the vehicle so as to take a proper driving mode.

The battery management module is used for monitoring the working state of the battery pack, including electric quantity, temperature and voltage parameters, and ensuring that the battery works in a safe and reliable range.

A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that said processor, when executing said computer program, implements the steps of an intelligent power protection control method for a hybrid vehicle.

A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a method for intelligent power protection control of a hybrid vehicle.

The invention has the beneficial effects that: different control strategies are implemented on the residual electric quantity of the power battery in stages, so that the battery is prevented from being deficient to the maximum extent, damage to the battery caused by excessive consumption of the battery is avoided, and the service life of the power battery is prolonged. The torque closed loop fault identification is added, so that the high-voltage electricity is prevented from being excessively consumed in the process of repeatedly starting the engine, and the power battery is further protected. According to factors such as external environment temperature, driving power requirement and the like, different SOC critical values are set as forced engine starting conditions, so that battery electric quantity management is more refined, and an optimal control effect is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a schematic flow chart of an intelligent electricity protection control method of a hybrid electric vehicle according to an embodiment of the invention;

fig. 2 is a diagram of an intelligent power protection control system of the intelligent power protection control method of the hybrid electric vehicle according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a system of an intelligent power protection control method of a hybrid electric vehicle according to an embodiment of the present invention.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1-2, a first embodiment of the present invention provides an intelligent power protection control method for a hybrid electric vehicle, including:

s1: and judging the SOC value of the battery in forced series connection according to the information of the ambient temperature, the driving requirement and the battery state.

Further, the information of the ambient temperature, the driving requirement and the battery state includes that when the ambient temperature is higher than-5 ℃ and no warm air conditioner is required, the system with the SOC of the power battery lower than 40% forcedly starts the engine, and the engine enters a series mode, and when the ambient temperature is lower than-5 ℃ or the warm air conditioner is required, the system with the SOC of the power battery lower than 55% forcedly starts the engine and enters the series mode. .

Further, the battery SOC value during forced series connection comprises that under the normal temperature state, when the battery SOC is lower than 40%, the engine is forced to start into a series connection mode, and when the environment temperature is lower than-5 ℃ or the requirement of warm air and air conditioning exists, the SOC critical value is adjusted to 55%;

it should be noted that, if the engine fails to continuously start for 3 times, the turtle-speed lamp is turned on to limit the speed of the whole vehicle, when the battery SOC is lower than 30%, the turtle-speed lamp is continuously turned on, the whole vehicle HCU does not respond to the driving torque demand, when the battery SOC is lower than 25%, the HCU limits the battery/air conditioner power, when the battery SOC is lower than 20% and no charging current is continuous for more than 1s, the BMS actively drops high voltage and reports faults, and the diagnosis instrument is required to clearly understand the BMS fault code to normally go up high voltage.

S2: and (5) limiting the speed of the whole vehicle and lighting the tortoise speed lamp according to the starting condition and failure times of the engine.

Furthermore, the speed limiting of the whole vehicle by the engine starting condition and the failure times comprises the steps of triggering a first-level fault of a system after the engine is started for 1 time in the forced serial connection process, turning on a tortoise speed lamp in an indicator lamp instrument to request the engine to stop, triggering a second-level fault to request the engine to stop when the engine is started for 3 times continuously and failed, prohibiting the engine from starting, and limiting the speed of the whole vehicle.

S3: and judging whether to limit the driving torque demand and the power of the battery and the air conditioner according to the battery SOC, and increasing the torque closed loop fault identification.

Further, the step of judging whether to limit the driving torque requirement and the power of the battery and the air conditioner according to the battery SOC comprises the step of controlling the output of the engine and the motor according to the current battery SOC state, so as to reduce the output power of the engine and the rotating speed of the motor;

Further, the increased torque closed loop fault identification comprises hybrid power control unit state diagnosis, motor and engine actual steady state torque detection and duration detection, fault type is judged according to diagnosis detection results, and corresponding measures are taken.

It should be noted that, the state diagnosis of the hybrid control unit includes motor failure detection, engine failure detection, whether there is a forced shutdown request, whether there is an engine shutdown request of the electronic control unit, whether there is a fuel consumption reduction operation request sent by the hybrid control unit, whether there is an engine starting process detection, and a light-up flag indicator detection of the engine;

the method comprises the steps of judging the fault type according to a diagnosis detection result, and taking corresponding measures, wherein when a counting unit is more than or equal to 3, triggering a secondary fault, requesting an engine to stop, prohibiting the engine from starting, releasing after re-electrifying, and after the power battery is excessively low to lead the system to actively lower high voltage, clearing a fault code of a battery management system by using a diagnostic instrument, and then resetting the system to normally upper high voltage.

It should be noted that, assuming the battery SOC value is S and the driving torque demand is τ _d Battery power P _b The air conditioner power is P _a Torque closed loop fault is identified as τ _e By a function h (S, τ _d ,P _b ,P _a ,τ _e ) The influence of the battery SOC value on the driving torque demand, the power of the battery and the air conditioner and the torque closed loop fault identification are represented, when S is less than or equal to 0.1, the battery SOC value is too low, and the driving torque demand is limited to be tau _d X 0.5, battery power P _b X 0.8, air conditioner power P _a X 0.6, and increasing torque closed loop fault identification as τ _e +0.1Nm/kgm ² /s ² ；

When S is more than or equal to 0.9, the battery SOC value is too high, and the driving torque demand, the battery power, the air conditioner power or the increased torque closed loop fault identification is not required to be limited.

Example 2

In order to verify the beneficial effects of the invention, the invention is scientifically demonstrated through experiments.

The system monitors the state of the power battery, when detecting that the SOC of the power battery is lower, judges the conditions such as warm air and air conditioning requirements according to the state of the vehicle and the requirements of a driver, and executes the following steps:

1. when the ambient temperature is higher than-5 ℃ and no warm air conditioner is required, the system with the SOC of the power battery lower than 40% forcedly starts the engine to enter a series mode; when the ambient temperature is lower than-5 ℃ or the demand of warm air and air conditioning exists, the system with the SOC lower than 55% of the power battery can forcedly start the engine to enter a series mode.

2. If the engine is failed to start 1 time in the forced serial connection process, triggering a first-level fault of the system, and turning on a turtle speed lamp to request the engine to stop; when the engine is failed to be started for 3 times continuously, triggering a secondary fault, requesting the engine to stop, prohibiting the engine from being started, and performing speed limiting treatment on the whole vehicle.

3. When the SOC of the power battery is reduced to 30%, the turtle speed lamp is continuously turned on, the HCU of the whole vehicle does not respond to the driving torque demand, the vehicle cannot run, and the power consumption of the vehicle-mounted electric equipment is not limited.

4. When the power battery SOC decreases to 25%, the HCU limits battery/air conditioning power while the vehicle is not running.

5. When the SOC of the power battery is reduced to 20%, and the charging current is not detected to last more than 1s, the system lights the low-power-consumption fault lamp of the power battery, and the BMS actively outputs high-voltage power.

After the system actively outputs high voltage due to the too low electric quantity of the power battery, the system can normally output high voltage again after the BMS fault code is clear by the diagnostic instrument.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Example 3

A third embodiment of the present invention, which is different from the first two embodiments, is:

the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Example 4

Referring to fig. 3, for an embodiment of the present invention, a system for an intelligent power protection control method of a hybrid electric vehicle is provided, which is characterized in that: the system comprises an air conditioner control module, an engine management module, an indicator light instrument and a battery management module.

And the air conditioner control module is used for intelligently adjusting the working state of the air conditioner system according to the temperature and humidity requirements in the vehicle and the load condition of the vehicle in the running process of the vehicle so as to reduce energy consumption.

And the engine management system can optimize the working state of the engine according to the running working conditions of the vehicle, including acceleration, deceleration and cruising, so as to realize the balance of fuel economy and power performance, and can also work cooperatively with the braking system to convert part of braking energy into electric energy to be stored in a battery to realize energy recovery when the vehicle brakes.

The indicator light instrument can display real-time state of the vehicle, including driving mode, battery power and fuel consumption information, and helps a driver to know the running condition of the vehicle so as to take a proper driving mode.

And the battery management module is responsible for monitoring the working state of the battery pack, including electric quantity, temperature and voltage parameters, and ensuring that the battery works in a safe and reliable range.

Claims

1. An intelligent electricity protection control method for a hybrid electric vehicle is characterized by comprising the following steps of: comprising the steps of (a) a step of,

judging the SOC value of the battery in forced series connection according to the information of the ambient temperature, the driving requirement and the battery state;

speed limiting is carried out on the whole vehicle according to the starting condition and failure times of the engine, and a tortoise speed lamp is lightened;

and judging whether to limit the driving torque demand and the power of the battery and the air conditioner according to the battery SOC, and increasing the torque closed loop fault identification.

2. The intelligent power protection control method of the hybrid electric vehicle according to claim 1, wherein: the information of the environment temperature, the driving requirement and the battery state comprises that when the environment temperature is higher than-5 ℃ and no warm air conditioner requirement exists, the system with the SOC lower than 40% of the SOC of the power battery forcedly starts the engine, and the engine enters a series mode, and when the environment temperature is lower than-5 ℃ or the warm air conditioner requirement exists, the system with the SOC lower than 55% of the SOC of the power battery forcedly starts the engine and enters the series mode.

3. The intelligent power protection control method of the hybrid electric vehicle according to claim 2, wherein: the battery SOC value during forced series connection comprises that under the normal temperature state, when the battery SOC is lower than 40%, the engine is forced to start into a series connection mode, and when the environment temperature is lower than-5 ℃ or the requirement of warm air and air conditioning exists, the SOC critical value is adjusted to 55%;

4. The intelligent power protection control method for a hybrid electric vehicle according to claim 3, wherein: the speed limiting of the whole vehicle comprises the steps of triggering a first-level fault of a system, turning on a turtle-speed lamp in an indicator lamp instrument to request the engine to stop if the engine is started for 1 time after failure in the forced series connection process, triggering a second-level fault to request the engine to stop when the engine is started for 3 times continuously and failed, prohibiting the engine from being started, and limiting the speed of the whole vehicle.

5. The intelligent power protection control method for a hybrid electric vehicle according to claim 4, wherein: the judging according to the battery SOC comprises the steps that the HCU reduces the output power of an engine and reduces the rotating speed of a motor by controlling the output of the engine and the motor according to the current battery SOC state;

6. The intelligent power protection control method for a hybrid electric vehicle according to claim 5, wherein: the fault identification of the closed loop of the increased torque comprises state diagnosis of a hybrid power control unit, actual steady-state torque detection and duration detection of a motor and an engine, and the fault type is judged according to the diagnosis detection result and corresponding measures are taken.

7. The intelligent power protection control method for a hybrid electric vehicle according to claim 6, wherein: the state diagnosis of the hybrid power control unit comprises motor fault detection, engine fault detection, forced shutdown request or not, engine shutdown request or not of the electronic control unit, operation request for reducing fuel consumption sent by the hybrid power control unit or not, detection of whether an engine is started or not and detection of a light-off zone indicator lamp of the engine;

setting the SOC value of the battery as S and the driving torque requirement as tau _d Battery power P _b The air conditioner power is P _a Torque closed loop fault is identified as τ _e By a function h (S, τ _d ,P _b ,P _a ,τ _e ) The influence of the battery SOC value on the driving torque demand, the power of the battery and the air conditioner and the torque closed loop fault identification are shown, when S is smaller than or equal to the set value, the battery SOC value is too low, and the driving torque demand is limited to be tau _d X 0.5, battery power P _b X 0.8, air conditioner power P _a X 0.6, and increasing torque closed loop fault identification as τ _e +0.1Nm/kgm ² /s ² ；

8. A system employing the intelligent power protection control method of a hybrid vehicle according to any one of claims 1 to 7, characterized in that: the system comprises an air conditioner control module, an engine management module, an indicator light instrument and a battery management module;

the air conditioner control module is used for intelligently adjusting the working state of the air conditioner system according to the temperature and humidity requirements in the vehicle and the load condition of the vehicle in the running process of the vehicle so as to reduce energy consumption;

the engine management module optimizes the working state of the engine according to the running working conditions of the vehicle, including acceleration, deceleration and cruising, realizes the balance of fuel economy and power performance, and when the vehicle brakes, the engine management system also works cooperatively with the braking system to convert part of braking energy into electric energy to be stored in the battery, so as to realize energy recovery;

the indicator light instrument can display the real-time state of the vehicle, including the driving mode, the battery power and the oil consumption information, so as to help a driver to know the running condition of the vehicle and to take a proper driving mode;

9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.