Engine fault processing method of heavy hybrid power system

Abstract

The invention discloses an engine fault processing method of a heavy hybrid power system. The engine fault processing method comprises the steps that the fault level of an engine is judged; if yes, whether the power system can work normally or not is monitored through engine response torque; if yes, the actual torque limiting level is judged through the engine response torque, and the driving mode is switched according to the actual limiting state; if the driving mode is the third level, the driving mode is switched into pure electric driving, and the engine is stopped from running; if so, activating drivability limitation, and limiting the power output of the engine or the motor according to the torque; if at the fifth stage, the drivability limit is activated and the power output of the engine or the motor is limited according to the vehicle speed. According to the engine fault handling method for the heavy-duty hybrid power system, the fault of the engine can be handled by adjusting the heavy-duty hybrid power system according to the current state, meanwhile, other power parts are protected against damage caused by the fault of the engine, and the regulatory limitation of the heavy-duty vehicle can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy-duty hybrid vehicles, and more particularly to a method for processing engine failures in a heavy-duty hybrid vehicle system. Background Art

[0002] Heavy-duty vehicles refer to M or N vehicles with a maximum gross mass greater than 3500 kg. Hybrid vehicles refer to vehicles whose vehicle drive system is composed of two or more single drive systems that can operate simultaneously, usually using traditional internal combustion engines and electric motors as power sources, and the vehicle's power is provided independently or jointly by a single drive system according to the actual vehicle driving state.

[0003] GB 17691-2018 specifies the emission limits and test methods for gaseous and particulate pollutants emitted by vehicles and their engines equipped with compression ignition engines in the sixth stage. While the hybrid system of heavy-duty vehicles uses a hybrid power combination to provide power, it must meet the emission regulations of GB 17691. Currently, there is no engine fault handling method to meet emission regulations.

[0004] Therefore, there is an urgent need for an engine fault handling method for a heavy-duty hybrid system. Summary of the invention

[0005] The purpose of the present invention is to provide an engine fault handling method for a heavy-duty hybrid power system to solve the problems in the above-mentioned prior art. It can not only handle the engine failure by adjusting the heavy-duty vehicle hybrid power system according to the current state, but also protect the remaining power components from damage caused by engine failure, and can also meet the regulatory restrictions on heavy-duty vehicles.

[0006] The present invention provides an engine fault processing method for a heavy-duty hybrid power system, which comprises:

[0007] Determine the fault level of the engine;

[0008] If the engine fault level is level one, the engine response torque is used to monitor whether the power system can work normally;

[0009] If the engine fault level is level 2, the actual torque limit level is determined by the engine response torque, and the driving mode is switched based on whether the actual limit state can meet the driver's needs;

[0010] If the engine fault level is level three, the driving mode will be forced to switch to pure electric driving and the engine will be stopped;

[0011] If the engine fault level is level 4, the driving performance restriction system is activated and the power output of the engine or electric motor is limited according to the torque;

[0012] If the engine fault level is level five, the driving performance limitation system will be activated and the power output of the engine or electric motor will be limited according to the vehicle speed.

[0013] In the above-mentioned engine fault processing method for a heavy-duty hybrid power system, preferably, when the engine fault level is level one, monitoring whether the power system can work normally by using the response torque of the engine specifically includes:

[0014] When a primary fault occurs in the engine, the corresponding fault code is stored in the electronic control unit;

[0015] The fault level is sent to the vehicle controller through the electronic control unit;

[0016] After receiving the first-level fault level of the engine, the vehicle controller monitors whether the power system can work normally through the engine's response torque;

[0017] If the power system can work normally, the current power output state will continue to be maintained;

[0018] The electronic control unit lights up the engine fault indicator light on the instrument panel to remind the driver to perform vehicle maintenance later.

[0019] The engine fault processing method of the heavy-duty hybrid system as described above, wherein preferably, when the engine fault level is level 2, the actual torque limit level is determined by the response torque of the engine, and the driving mode is switched according to whether the actual limit state can meet the driver's demand, specifically including:

[0020] When a secondary fault occurs in the engine, the corresponding fault code is retained in the electronic control unit;

[0021] The electronic control unit sends the fault level to the vehicle controller;

[0022] After receiving the secondary fault of the engine, the vehicle controller determines the actual torque limit level through the response torque of the engine, and determines whether to maintain the current working condition according to the actual torque limit level;

[0023] The vehicle controller controls the instrument to give text prompts for engine failures;

[0024] The electronic control unit illuminates the instrument's engine fault indicator light to remind the driver to perform vehicle maintenance after the current driving cycle.

[0025] The engine fault processing method of the heavy-duty hybrid system as described above, wherein preferably, after receiving the secondary fault of the engine, the vehicle controller determines the actual torque limit level through the response torque of the engine, and determines whether to maintain the current working condition according to the actual torque limit level, specifically including:

[0026] Confirm that the current driving mode is in series or parallel mode;

[0027] If it is a series working condition, the vehicle controller obtains the driver's driving demand;

[0028] The vehicle controller determines whether the maximum torque in the actual limiting state meets the driving requirements;

[0029] If satisfied, continue to maintain the current working condition;

[0030] If not, determine whether the electric motor and battery power meet the parallel working condition;

[0031] If the conditions are met, the system will enter the motor drive mode, and the vehicle controller will control the instrument panel to remind the driver to switch the driving mode through text.

[0032] If not satisfied, continue to maintain the current working condition.

[0033] The engine fault processing method of the heavy-duty hybrid system as described above, wherein preferably, when the engine fault level is level three, the driving mode is forcibly switched to pure electric driving and the engine is stopped, specifically including:

[0034] When a third-level fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit;

[0035] The electronic control unit sends the fault level to the vehicle controller;

[0036] After receiving the third-level fault of the engine, the vehicle controller obtains the driver's driving demand;

[0037] The vehicle controller determines whether the current power and motor status meet the parallel working condition;

[0038] If the conditions are met, the driving mode will be forcibly switched to pure electric driving and the engine will be stopped;

[0039] If not satisfied, the vehicle will be stopped;

[0040] The vehicle controller controls the instrument to give text prompts for engine failures;

[0041] The electronic control unit illuminates the instrument's engine fault indicator light to remind the driver to perform vehicle maintenance after the current driving cycle.

[0042] The engine fault processing method of the heavy-duty hybrid system as described above, wherein preferably, when the engine fault level is level 4, the activating the driving performance restriction system and limiting the power output of the engine or the motor according to the torque specifically includes:

[0043] When a level 4 fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit;

[0044] The electronic control unit sends the fault level to the vehicle controller;

[0045] After receiving the engine's level 4 fault, the vehicle controller determines whether the current driving mode is in series mode or parallel mode;

[0046] If in series mode, the engine will continue to be used for driving under this power and the power output of the engine will be limited according to the torque;

[0047] If in parallel mode, the power of the motor is dynamically limited to the corresponding torque state, and the power output of the motor is limited according to the torque;

[0048] The vehicle controller controls the instrument to give text prompts for engine failures;

[0049] The electronic control unit lights up the engine fault indicator light and the driver warning light on the instrument panel to remind the driver that the driving performance restriction system has been activated and that the vehicle should be repaired after the current driving cycle is completed.

[0050] The engine fault processing method of the heavy-duty hybrid system as described above, wherein preferably, when the engine fault level is level five, the activating the driving performance limitation system and limiting the power output of the engine or the motor according to the vehicle speed specifically includes:

[0051] When a level 5 fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit;

[0052] The electronic control unit sends the fault level to the vehicle controller;

[0053] After receiving the fifth-level fault of the engine, the vehicle controller limits the vehicle to 20km / h and determines whether the current driving mode is in series mode or parallel mode;

[0054] If in series mode, the engine power output is limited according to vehicle speed;

[0055] If in parallel mode, the power output of the motor will be forced into series mode according to the vehicle speed limit, and the engine induction system will be used to make the vehicle reach the speed limit to meet regulatory requirements;

[0056] The vehicle controller controls the instrument to give text prompts for engine failures;

[0057] The electronic control unit lights up the engine fault indicator light and the driver warning light on the instrument panel to remind the driver that the driving performance restriction system has been activated and that the vehicle should be repaired after the current driving cycle is completed.

[0058] The present invention provides an engine fault processing method for a heavy-duty hybrid system. When a heavy-duty hybrid system encounters an engine system fault, the engine fault condition is identified and corresponded to regulatory requirements, and an adjustment strategy for the heavy-duty hybrid system is formulated to handle the engine fault according to the current state, while protecting the remaining power components from damage caused by the engine fault and meeting the regulatory restrictions for heavy-duty vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0060] Figure 1 A flow chart of an embodiment of an engine fault processing method for a heavy-duty hybrid power system provided by the present invention;

[0061] Figure 2 It is a logic diagram of the engine fault handling strategy when the engine fault level is level one;

[0062] Figure 3 It is a logic diagram of the engine fault handling strategy when the engine fault level is level 2;

[0063] Figure 4 It is a logic diagram of the engine fault handling strategy when the engine fault level is level three;

[0064] Figure 5 It is a logic diagram of the engine fault handling strategy when the engine fault level is level 4;

[0065] Figure 6 This is the logic diagram of the engine fault handling strategy when the engine fault level is level five. DETAILED DESCRIPTION

[0066] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0067] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0069] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0070] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0071] The Stage VI emission regulations for heavy-duty vehicles require monitoring for severe functional faults, while increasing requirements for the correct operation of the NOx control system and specifying driving performance restrictions based on failures of the corresponding systems.

[0072] The corresponding system stipulates that when low reagent inventory, abnormal reagent quality, low reagent consumption, or a fault is detected, the driving performance restriction system will be activated if it is not corrected in time. The vehicle should include a two-level driving performance restriction system, namely a primary driving performance restriction system (performance restriction) and a severe driving performance restriction system (effectively restricting vehicle operation).

[0073] The sixth stage emission regulations for heavy-duty vehicles have made basic provisions for functional failures and emission limits, and clarified what kind of driver prompts or power limitation methods should be used when abnormal failures occur during vehicle operation. There is no problem in fully applying this regulation to fuel vehicles. The engine electronic control unit can achieve driving performance restrictions and driver prompts for the entire vehicle, and can handle the power adjustment of the vehicle under engine and emission failures; however, the power source of hybrid vehicles is not only the engine, and when meeting this regulation, it is necessary to consider both the safety of power system switching and the method of limiting the driving performance of the entire vehicle.

[0074] Heavy-duty vehicle hybrid systems lack guiding regulations and standards for engine and emission failures. OEMs need to meet the following demand scenarios based on the hybrid architecture and power distribution of the vehicle system:

[0075] To meet regulatory restrictions, heavy-duty hybrid vehicles must immediately diagnose and activate the driver warning system when there is an abnormality in the engine and its emission system, and at the same time activate restrictive measures such as the guidance system according to the fault level so that the driver can deal with it in time;

[0076] It is also necessary to formulate a handling strategy based on the impact of engine failure on the vehicle and the driver. Engine failures are divided into five levels, namely, level 1 failure: no impact on engine operation and no impact on emissions; level 2 failure: slight impact on engine operation and no impact on emissions; level 3 failure: severe impact on engine operation; level 4 failure: emissions leading to primary driving performance restrictions; level 5 failure: emissions leading to advanced driving performance restrictions. The handling of the five levels requires a strategy based on the impact on engine life and emission restrictions;

[0077] At the same time, the actual output status of the remaining power of the hybrid system is considered, and the impact of abnormal engine operation on the high-voltage components is evaluated before formulating treatment measures for the high-voltage power components.

[0078] The present invention provides an engine fault handling solution for a heavy-duty vehicle hybrid powertrain system that is a PHEV plug-in hybrid powertrain system. The PHEV includes two power sources, an engine and an electric motor. Under the series working condition, the engine mainly drives the heavy-duty vehicle to operate; under the parallel working condition, the engine and the electric motor can independently drive the vehicle to operate, and can work simultaneously or separately. The two modes realize a flexible mix of engine drive, electric motor drive, range-extended power generation, and external charging.

[0079] The heavy-duty vehicle hybrid power system involved in the present invention includes an engine 1, which can be flexibly used in driving and range-extending states; an electric motor 2, which is used to drive the heavy-duty vehicle with a pure electric or hybrid engine; an ECU 3 is an engine electronic control unit, which is used to control the engine operation, monitor engine failures, and send engine status information to the vehicle controller VCU4; VCU4 is used to control the overall power output of the heavy-duty vehicle, driving mode and power output source switching, component protection, driver reminders, etc.; an instrument 5 is used to display prompt information to the driver 6, and the instrument 5 includes an engine fault indicator light 7 and a driver warning light 8 to prompt the driver 6 to repair as soon as possible.

[0080] like Figure 1 As shown, the engine fault processing method of the heavy-duty hybrid power system provided in this embodiment includes the following steps in actual execution:

[0081] Step S1, determining the fault level of the engine 1.

[0082] Step S2: If the engine fault level is level one, monitor whether the power system can work normally through the response torque of the engine 1.

[0083] like Figure 2 As shown, in one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S2 may specifically include:

[0084] Step S21 : When a primary fault occurs in the engine 1 , a corresponding fault code is stored in the electronic control unit (ECU) 3 .

[0085] Step S22 : Send the fault level to the vehicle control unit (VCU) 4 through the electronic control unit (ECU) 3 .

[0086] Step S23 : After receiving the first-level fault level of the engine 1 , the vehicle control unit (VCU) 4 monitors whether the power system can work normally through the response torque of the engine 1 .

[0087] Step S24: If the power system can work normally, continue to maintain the current power output state.

[0088] Step S25 , the electronic control unit (ECU) 3 lights up the engine fault indicator light 7 of the instrument 5 to remind the driver 6 to perform vehicle maintenance later.

[0089] Step S3: If the engine fault level is level 2, the actual torque limit level is determined by the response torque of the engine 1, and the driving mode is switched according to whether the actual limit state can meet the driver's needs.

[0090] like Figure 3As shown, in one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S3 may specifically include:

[0091] Step S31 : When a secondary fault occurs in the engine 1 , the corresponding fault code is retained in the electronic control unit (ECU) 3 .

[0092] Step S32 : The electronic control unit (ECU) 3 sends the fault level to the vehicle control unit (VCU) 4 .

[0093] Step S33 : After receiving the secondary fault of the engine 1 , the vehicle controller (VCU) 4 determines the actual torque limit level through the response torque of the engine 1 , and determines whether to maintain the current operating condition according to the actual torque limit level.

[0094] In one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S33 may specifically include:

[0095] Step S331, confirming that the current driving mode is in a series operating mode or a parallel operating mode.

[0096] Step S332: If it is a series working condition, the vehicle controller (VCU) 4 obtains the driving demand of the driver 6.

[0097] Step S333 : The vehicle controller (VCU) 4 determines whether the maximum torque in the actual limiting state meets the driving requirements.

[0098] Step S334: If satisfied, continue to maintain the current working condition.

[0099] Step S335: If not, determine whether the electric motor and battery power meet the parallel working condition.

[0100] Step S336: If the conditions are met, the motor drive is entered, and the vehicle controller (VCU) 4 controls the instrument 5 to remind the driver 6 to switch the driving mode through text.

[0101] After entering the motor drive, it enters the parallel working state. At this time, motor 2 is used as the main driving state, and then engine 1 is used for parallel power generation.

[0102] Step S337: If not satisfied, continue to maintain the current working condition.

[0103] If the power of either the motor or the battery does not meet the parallel operating conditions, it will fall back to series mode and use the engine as the main drive.

[0104] Step S34: The vehicle controller (VCU) 4 controls the instrument 5 to give a text prompt of an engine failure.

[0105] Step S35 , the electronic control unit (ECU) 3 lights up the engine fault indicator light 7 of the instrument 5 to remind the driver 6 to perform vehicle maintenance after the current driving cycle ends.

[0106] Step S4: If the engine fault level is level three, the driving mode is forcibly switched to pure electric driving and the engine is stopped.

[0107] like Figure 4 As shown, in one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S4 may specifically include:

[0108] Step S41: When a third-level fault occurs in the engine, the corresponding fault code is retained in the electronic control unit (ECU) 3.

[0109] Step S42 : The electronic control unit (ECU) 3 sends the fault level to the vehicle control unit (VCU) 4 .

[0110] Step S43 : After receiving the third-level fault of the engine 1 , the vehicle controller (VCU) 4 obtains the driving demand of the driver 6 .

[0111] Step S44: The vehicle controller (VCU) 4 determines whether the current power and motor status meet the parallel working condition.

[0112] Step S45: If the conditions are met, the driving mode is forcibly switched to pure electric driving and the engine is stopped.

[0113] Furthermore, if the battery power or the state of the motor 2 cannot support the long-term operation of the vehicle, the minimum driving state is guaranteed and the driver 6 is prompted to drive to a service station for repair as soon as possible.

[0114] Step S46: If not satisfied, stop the vehicle operation.

[0115] Step S47: The vehicle controller (VCU) 4 controls the instrument 5 to give a text prompt of an engine failure.

[0116] The text prompt of the engine failure is given through the instrument 5, which can remind the driver to drive to the service station for repair as soon as possible.

[0117] Step S48: The electronic control unit (ECU) 3 lights up the engine fault indicator light 7 of the instrument 5 to remind the driver 6 to perform vehicle maintenance after the current driving cycle ends.

[0118] Step S5: If the engine fault level is level 4, the drivability limitation system is activated, and the power output of the engine 1 or the motor 2 is limited according to the torque.

[0119] like Figure 5As shown, in one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S5 may specifically include:

[0120] Step S51: When a level 4 fault occurs in the engine, the corresponding fault code is retained in the electronic control unit (ECU) 3.

[0121] Step S52 : The electronic control unit (ECU) 3 sends the fault level to the vehicle control unit (VCU) 4 .

[0122] Step S53 : After receiving the fourth-level fault of the engine 1 , the vehicle controller (VCU) 4 determines whether the current driving mode is in the series mode or the parallel mode.

[0123] Step S54: If the vehicle is in the series mode, the engine 1 continues to be used for driving under this power, and the power output of the engine 1 is limited according to the torque.

[0124] Step S55: If in the parallel mode, the power of the motor 2 is dynamically limited to a corresponding torque state, and the power output of the motor 2 is limited according to the torque.

[0125] Level 4 faults affect emission regulations. According to regulatory restrictions, the power will be limited to less than 75% output. The vehicle controller (VCU) 4 determines whether it is currently in series or parallel mode. If it is in the series state, the engine 1 continues to be used for driving under this power. If it is in the parallel mode, the power of the motor 2 is dynamically limited to the corresponding torque state to meet regulatory requirements.

[0126] Step S56, the vehicle controller (VCU) 4 controls the instrument 5 to give a text prompt of engine failure;

[0127] Step S57, the electronic control unit (ECU) 3 lights up the engine fault indicator light 7 and the driver warning light 8 of the instrument 5 to remind the driver 6 that the current vehicle has activated the driving performance restriction system and to perform vehicle maintenance after the current driving cycle ends.

[0128] Step S6: If the engine fault level is level five, the driving performance limitation system is activated and the power output of the engine 1 or the motor 2 is limited according to the vehicle speed.

[0129] like Figure 6 As shown, in one implementation of the engine failure processing method of the heavy-duty hybrid power system of the present invention, the step S6 may specifically include:

[0130] Step S61 : When a level 5 fault occurs in the engine 1 , the corresponding fault code is retained in the electronic control unit (ECU) 3 .

[0131] Step S62 : The electronic control unit (ECU) 3 sends the fault level to the vehicle control unit (VCU) 4 .

[0132] Step S63 : After receiving the fifth-level fault of the engine 1 , the vehicle controller (VCU) 4 limits the vehicle speed to 20 km / h and determines whether the current driving mode is in the series mode or the parallel mode.

[0133] Step S64: If in the series mode, the power output of the engine 1 is limited according to the vehicle speed.

[0134] Step S65: If the vehicle is in the parallel mode, the power output of the motor 2 is forced to enter the series mode according to the vehicle speed limit, and the engine induction system is used to make the vehicle reach the speed limit state to meet regulatory requirements.

[0135] Level 5 faults affect emission regulations. According to regulatory restrictions, the vehicle is limited to 20 km / h. The vehicle controller (VCU) 4 will be forced to enter the series mode and use the engine induction system to make the vehicle reach the speed limit state to meet regulatory requirements.

[0136] Step S66: The vehicle controller (VCU) 4 controls the instrument 5 to give a text prompt of an engine failure.

[0137] Step S67, the electronic control unit (ECU) 3 lights up the engine fault indicator light 7 and the driver warning light 8 of the instrument 5 to remind the driver that the driving performance restriction system has been activated and the vehicle should be repaired after the current driving cycle is completed.

[0138] When a heavy-duty vehicle uses a hybrid power system, the present invention covers the system restricted by current emission regulations. At the same time, due to the particularity of the hybrid power system, a better strategy is formulated to achieve smooth power switching and prompts of the driver warning system.

[0139] The engine fault handling method of the heavy-duty hybrid system provided in the embodiment of the present invention, when the heavy-duty vehicle hybrid system encounters an engine system failure, by identifying the engine failure situation and corresponding to the regulatory requirements, formulates an adjustment strategy for the heavy-duty vehicle hybrid system according to the current state to handle the engine failure, while protecting the remaining power components from damage caused by the engine failure, and can also meet the regulatory restrictions on heavy-duty vehicles.

[0140] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0141] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for handling engine failure of a heavy-duty hybrid system, characterized in that: include: Determine the fault level of the engine; If the engine fault level is level one, the engine response torque is used to monitor whether the power system can work normally; If the engine fault level is level 2, the actual torque limit level is determined by the engine response torque, and the driving mode is switched based on whether the actual limit state can meet the driver's needs; If the engine fault level is level three, the driving mode will be forced to switch to pure electric driving and the engine will be stopped; If the engine fault level is level 4, the driving performance restriction system is activated and the power output of the engine or electric motor is limited according to the torque; If the engine fault level is level five, the driving performance limitation system will be activated and the power output of the engine or electric motor will be limited according to the vehicle speed.

2. The engine failure processing method of the heavy-duty hybrid power system according to claim 1, characterized in that: When the engine fault level is level one, monitoring whether the power system can work normally through the engine response torque specifically includes: When a primary fault occurs in the engine, the corresponding fault code is stored in the electronic control unit; The fault level is sent to the vehicle controller through the electronic control unit; After receiving the first-level fault level of the engine, the vehicle controller monitors whether the power system can work normally through the engine's response torque; If the power system can work normally, the current power output state will continue to be maintained; The electronic control unit lights up the engine fault indicator light on the instrument panel to remind the driver to perform vehicle maintenance later.

3. The engine failure processing method of the heavy-duty hybrid power system according to claim 1, characterized in that: When the engine fault level is level 2, the actual torque limit level is determined by the engine response torque, and the driving mode is switched according to whether the actual limit state can meet the driver's needs, specifically including: When a secondary fault occurs in the engine, the corresponding fault code is retained in the electronic control unit; The electronic control unit sends the fault level to the vehicle controller; After receiving the secondary fault of the engine, the vehicle controller determines the actual torque limit level through the response torque of the engine, and determines whether to maintain the current working condition according to the actual torque limit level; The vehicle controller controls the instrument to give text prompts for engine failures; The electronic control unit illuminates the instrument's engine fault indicator light to remind the driver to perform vehicle maintenance after the current driving cycle.

4. The engine failure processing method of the heavy-duty hybrid power system according to claim 3, characterized in that: After receiving the secondary fault of the engine, the vehicle controller determines the actual torque limit level through the response torque of the engine, and determines whether to maintain the current working condition according to the actual torque limit level, specifically including: Confirm that the current driving mode is in series or parallel mode; If it is a series working condition, the vehicle controller obtains the driver's driving demand; The vehicle controller determines whether the maximum torque in the actual limiting state meets the driving requirements; If satisfied, continue to maintain the current working condition; If not, determine whether the electric motor and battery power meet the parallel working condition; If the conditions are met, the system will enter the motor drive mode, and the vehicle controller will control the instrument panel to remind the driver to switch the driving mode through text. If not satisfied, continue to maintain the current working condition.

5. The engine failure processing method of the heavy-duty hybrid power system according to claim 1, characterized in that: When the engine fault level is level three, the driving mode is forcibly switched to pure electric driving and the engine is stopped, specifically including: When a third-level fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit; The electronic control unit sends the fault level to the vehicle controller; After receiving the third-level fault of the engine, the vehicle controller obtains the driver's driving demand; The vehicle controller determines whether the current power and motor status meet the parallel working condition; If the conditions are met, the driving mode will be forcibly switched to pure electric driving and the engine will be stopped; If not satisfied, the vehicle will be stopped; The vehicle controller controls the instrument to give text prompts for engine failures; The electronic control unit illuminates the instrument's engine fault indicator light to remind the driver to perform vehicle maintenance after the current driving cycle.

6. The engine failure processing method of the heavy-duty hybrid power system according to claim 1, characterized in that: When the engine fault level is level 4, the drivability limitation system is activated and the power output of the engine or the motor is limited according to the torque, specifically including: When a level 4 fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit; The electronic control unit sends the fault level to the vehicle controller; After receiving the engine's level 4 fault, the vehicle controller determines whether the current driving mode is in series mode or parallel mode; If in series mode, the engine will continue to be used for driving under this power and the power output of the engine will be limited according to the torque; If in parallel mode, the power of the motor is dynamically limited to the corresponding torque state, and the power output of the motor is limited according to the torque; The vehicle controller controls the instrument to give text prompts for engine failures; The electronic control unit lights up the engine fault indicator light and the driver warning light on the instrument panel to remind the driver that the driving performance restriction system has been activated and that the vehicle should be repaired after the current driving cycle is completed.

7. The engine failure processing method of the heavy-duty hybrid power system according to claim 1, characterized in that: When the engine fault level is level 5, the driving performance limitation system is activated and the power output of the engine or motor is limited according to the vehicle speed, specifically including: When a level 5 fault occurs in the engine, the corresponding fault code will be retained in the electronic control unit; The electronic control unit sends the fault level to the vehicle controller; After receiving the fifth-level fault of the engine, the vehicle controller limits the vehicle to 20km / h and determines whether the current driving mode is in series mode or parallel mode; If in series mode, the engine power output is limited according to vehicle speed; If in parallel mode, the power output of the motor will be forced into series mode according to the vehicle speed limit, and the engine induction system will be used to make the vehicle reach the speed limit to meet regulatory requirements; The vehicle controller controls the instrument to give text prompts for engine failures; The electronic control unit lights up the engine fault indicator light and the driver warning light on the instrument panel to remind the driver that the driving performance restriction system has been activated and that the vehicle should be repaired after the current driving cycle is completed.

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