Torque distribution method under engine fault torque limitation, controller and vehicle

Abstract

The invention provides a torque distribution method under an engine fault, a controller and a vehicle, and solves the problems that in the prior art, after the torque of an engine is limited, the power performance of the whole vehicle is reduced, the engine works in a fault for a long time, and the fault is further deteriorated. According to the torque distribution method under the engine fault torque limitation, in the operation process of the hybrid vehicle, relevant parameters are detected at any time, whether the fault torque limitation occurs or not is determined according to the preset fault torque limitation judgment condition, and the torque limitation level of the fault torque limitation is determined; power sources and target torque of each power source are determined according to preset limiting torque corresponding to the torque limiting grade and the required driving torque of the hybrid vehicle, so that the sum of the target torque of at least one power source is equal to the required driving torque of the hybrid vehicle. When the engine breaks down and limits torque, the motor can be fully utilized to compensate the corresponding driving torque, the motor can be fully utilized, the working time of the engine can be shortened, and therefore the economical efficiency of the whole hybrid vehicle is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle torque distribution, and in particular to a torque distribution method, a controller and a vehicle under engine failure. Background Art

[0002] During the operation of the vehicle, the failure of the components in the post-treatment system, or the failure of the urea pump and urea nozzle, or the failure of the components in the engine control system (such as the engine control unit or sensor), or the failure of the internal components of the engine (such as the valve train failure or insufficient cylinder pressure, etc.), will cause the engine to be torque limited to prevent the probability of further deterioration of the fault due to excessive power. Engine torque limitation refers to the limitation of the engine's torque output. Therefore, when the engine is torque limited, the vehicle's power performance is reduced, the vehicle speed is reduced, and it is difficult to reach the service station quickly. In addition, the engine works for a long time, which further deteriorates the fault. Summary of the invention

[0003] In view of this, the present application provides a torque distribution method, a controller and a vehicle under engine failure. When the engine fails and the torque is limited, the motor can be fully utilized to compensate for the corresponding driving torque. This can not only fully utilize the motor, but also reduce the engine working time, thereby ensuring the overall economy of the hybrid vehicle.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions: a torque distribution method under engine fault torque limiting, applied to a hybrid vehicle, the hybrid vehicle comprising: an engine, a power battery and a motor; wherein the torque distribution method comprises: when the engine fails to limit torque, determining a preset limit torque corresponding to the torque limit level according to the torque limit level of the fault torque limiting; determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, so that the sum of the first target driving torque and the second target driving torque is equal to the required driving torque of the hybrid vehicle; controlling the engine to output the first target driving torque; and controlling the motor to output the second target driving torque.

[0005] In one embodiment of the present application, the first target driving torque of the engine and the second target driving torque of the motor are determined according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, including: when the torque limit level is the primary torque limit and the required driving torque of the hybrid vehicle is greater than the preset limit torque corresponding to the primary torque limit, determining the preset limit torque as the first target driving torque of the engine; calculating the motor compensation torque according to the preset limit torque and the current driving torque of the engine; and determining the second target driving torque of the motor according to the current driving torque of the motor and the motor compensation torque.

[0006] In one embodiment of the present application, the first target driving torque of the engine and the second target driving torque of the motor are determined according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, and also includes: when the torque limit level is the primary torque limit and the required torque of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the primary torque limit, determining the current driving torque of the engine as the first target driving torque of the engine; determining the current driving torque of the motor as the second target driving torque of the motor.

[0007] In one embodiment of the present application, the first target driving torque of the engine and the second target driving torque of the motor are determined according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, including: when the torque limit level is a high-level torque limit and the hybrid vehicle is in a hybrid mode, and when the state of charge value of the power battery is 100%, the hybrid mode is switched to a pure electric mode, and the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle.

[0008] In one embodiment of the present application, when the torque limit level is a high-level torque limit, and the hybrid vehicle is in a hybrid mode, and when the state of charge value of the power battery is 100%, the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle. Thereafter, the torque distribution method further includes: when the state of charge value of the power battery is less than a preset threshold value, switching the pure electric mode to a hybrid mode, and determining the first target driving torque of the engine to be the preset limit torque corresponding to the high-level torque limit.

[0009] In one embodiment of the present application, the first target driving torque of the engine and the second target driving torque of the motor are determined according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, and also include: when the torque limit level is a high-level torque limit, and the hybrid vehicle is in a hybrid mode, and the state of charge value of the power battery is greater than a preset threshold and less than 100%, and the preset limit torque corresponding to the high-level torque limit of the engine is less than the required torque of the hybrid vehicle, determining the first target driving torque of the engine as the preset limit torque corresponding to the high-level torque limit; determining the motor compensation torque according to the state of charge value of the power battery and the duration of the fault torque limit; and calculating the second target driving torque of the motor according to the current driving torque of the motor and the motor compensation torque.

[0010] In one embodiment of the present application, the motor compensation torque is calculated based on the state of charge value of the power battery and the duration of the fault torque limitation, including: constructing a fault torque limitation compensation database, the fault torque limitation compensation database including the state of charge value of the power battery, the duration of the fault torque limitation and the corresponding motor compensation torque; querying the motor compensation torque that matches the state of charge value of the power battery and the duration of the fault torque limitation in the fault torque limitation compensation database.

[0011] In one embodiment of the present application, the first target driving torque of the engine and the second target driving torque of the motor are determined according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, and the method further includes: when the torque limit level is a high-level torque limit, and the hybrid vehicle is in a hybrid mode, and the state of charge value of the power battery is greater than a preset threshold and less than 100%, and the preset limit torque corresponding to the high-level torque limit of the engine is greater than the required torque of the hybrid vehicle, determining the preset limit torque corresponding to the high-level torque limit as the first target driving torque of the engine; calculating the power generation torque according to the preset limit torque corresponding to the high-level torque limit and the required torque of the hybrid vehicle; and controlling the motor to generate electricity with the power generation torque to charge the power battery.

[0012] As a second aspect of the present application, the present application also provides a torque distribution controller under engine fault torque limiting, including: a torque limit level determination module, which is used to determine the preset limit torque corresponding to the torque limit level according to the torque limit level of the fault torque limiting when the engine fails to limit torque; a torque distribution module, which is used to determine the first target driving torque of the engine and the second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle; a control module, which is used to control the engine to output the first target driving torque; and control the motor to output the second target driving torque.

[0013] As a third aspect of the present application, the present application also provides a hybrid vehicle, comprising: an engine; a motor, a power input shaft of the motor being connected to a power output shaft of the engine, a power battery, the motor being connected to the power battery; and the torque distribution controller described above.

[0014] The torque distribution method under engine fault torque limiting provided by the present application is to formulate the level of fault torque limiting, the judgment conditions corresponding to each level of fault torque limiting, and the corresponding preset limit torque in advance according to relevant standards. During the operation of the hybrid vehicle, the relevant parameters are detected at all times, and whether fault torque limiting occurs and the torque limiting level of the fault torque limiting are determined according to the preset judgment conditions of the fault torque limiting, and then the power source and the target torque of each power source are determined according to the preset limit torque corresponding to the torque limiting level and the required driving torque of the hybrid vehicle, so that the sum of the target torques of at least one power source is equal to the required driving torque of the hybrid vehicle. When the engine has a fault torque limiting, the motor can be fully utilized to compensate for the corresponding driving torque, which can not only fully utilize the motor, but also reduce the working time of the engine, thereby ensuring the overall vehicle economy of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 A working block diagram of a hybrid vehicle provided in an embodiment of the present application.

[0017] Figure 2 The figure is a flow chart of a torque distribution method under engine fault torque limitation provided in one embodiment of the present application.

[0018] Figure 3 The figure is a flow chart of a torque distribution method under engine fault torque limitation provided by another embodiment of the present application.

[0019] Figure 4 The figure is a flow chart of a torque distribution method under engine fault torque limitation provided by another embodiment of the present application.

[0020] Figure 5 The figure shows a working block diagram of a torque distribution controller under engine fault torque limitation provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solution of the embodiment of the present application is applicable to the application scenario of gear shift control of hybrid vehicles, and the hybrid vehicle can be a passenger car or a commercial vehicle. Figure 1 FIG. 1 is a working principle diagram of a hybrid vehicle provided in an embodiment of the present application. Figure 1 As shown, the hybrid vehicle includes:

[0022] The power battery 300, the engine 100, the motor 200 and the driving element 400, wherein the power output shaft of the engine 100 and the power output shaft of the motor 200 are connected to the driving element 400 to drive the driving element 400 to move. The engine 100 is connected to the motor 200, and the motor 200 converts the kinetic energy transmitted by the engine 100 into electrical energy and stores the electrical energy in the power battery 300 to charge the power battery 300. During the operation of the hybrid vehicle, the following three driving modes can be used to drive the driving element 400 to move:

[0023] (1) A pure electric driving mode can be used to drive the driving element 400 to move, that is, only the power battery 300 is used as the power source, and the motor 200 converts the electrical energy transmitted by the power battery 300 into kinetic energy to drive the driving element 400 to move. The required driving torque required to drive the driving element 400 to move is equal to the driving torque output by the power output shaft of the motor 200.

[0024] (2) A pure engine driving mode can be used to drive the driving element 400 to move, that is, only the engine 100 is used as the power source, the engine 100 drives the driving element 400 to move, and the required driving torque required to drive the driving element 400 to move is equal to the driving torque output by the power output shaft of the engine 100.

[0025] (3) The hybrid driving mode can be used to drive the driving element 400 to move, that is, the engine 100 and the power battery 300 are used as power sources to jointly drive the driving element 400 to move. The required driving torque required to drive the driving element 400 to move is equal to the sum of the driving torque output by the power output shaft of the motor 200 and the driving torque output by the power output shaft of the engine 100.

[0026] When the vehicle is running in the above-mentioned pure engine drive mode or hybrid drive mode, if there is a failure in the components of the post-treatment system, or the urea pump and urea nozzle, or the components in the engine control system (such as the engine control unit or sensor), or the internal components of the engine (such as valve train failure or insufficient cylinder pressure, etc.), the engine torque is limited, that is, the maximum torque of the engine is limited, the power of the whole vehicle is weakened, and the engine running time is long, which leads to further deterioration of the engine failure. In addition, when the engine is torque-limited, the power performance of the whole vehicle is reduced, the speed is reduced, and it is difficult to quickly reach the service station.

[0027] After research, the inventor of the present application proposes: to formulate the level of fault torque limitation and the judgment conditions corresponding to each level of fault torque limitation and the corresponding preset limit torque in advance according to relevant standards. During the operation of the hybrid vehicle, the relevant parameters are constantly detected, and the torque limitation level of the fault torque limitation is determined according to the preset judgment conditions of the fault torque limitation, and then the power source and the target torque of each power source are determined according to the preset limit torque corresponding to the torque limitation level and the required driving torque of the hybrid vehicle, so that the sum of the target torques of at least one power source is equal to the required driving torque of the hybrid vehicle. When the engine has a torque limitation due to a fault, the motor can be fully utilized to compensate for the corresponding driving torque, which can not only fully utilize the motor, but also reduce the working time of the engine, thereby ensuring the overall economy of the hybrid vehicle.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] As a first aspect of the present application, the present application provides a torque distribution method under engine fault torque limiting. Figure 1 FIG. 1 is a torque distribution method under engine fault torque limiting provided by an embodiment of the present application, such as Figure 1 As shown, the torque distribution method under engine failure torque limiting includes the following steps:

[0030] S1: when the engine is in torque limit failure, a preset torque limit corresponding to the torque limit level is determined according to the torque limit level of the torque limit failure;

[0031] Specifically, fault torque limiting refers to torque limiting when the vehicle drivability limiting system is activated by an engine fault.

[0032] Specifically, the specific judgment conditions for determining the occurrence and failure of torque limiting can refer to relevant standards, such as GB17691-2018 standard, or the conditions for failure of torque limiting can be designed according to relevant standards.

[0033] Similarly, the level of fault torque limiting can also be determined according to relevant standards. For example, the torque limiting level of fault torque limiting can have two levels, namely: primary torque limiting (primary driving performance limitation, primary engine performance limitation) and advanced torque limiting (advanced driving performance limitation, advanced engine performance limitation). Each level of fault torque limiting corresponds to a preset limiting torque, that is, after the engine has a fault torque limiting, the maximum torque of the engine is the preset limiting torque. The preset limiting torque corresponding to the fault torque limiting can be determined according to relevant standards, and can be equal to the standard provisions, or it can be less than the standard provisions. For example, the preset limiting torque corresponding to the primary torque limiting can be 75% of the external characteristic maximum torque of the engine, or it can be less than 75% of the external characteristic maximum torque of the engine. The preset limiting torque corresponding to the advanced torque limiting can be 50% of the external characteristic maximum torque of the engine, or it can be less than 50% of the external characteristic maximum torque of the engine.

[0034] Optionally, there may be multiple levels of fault torque limiting, and the judgment conditions corresponding to each level may be determined with reference to relevant standards. Similarly, the preset limit torque corresponding to each level may also be determined according to relevant standards, for example, primary limit torque, intermediate limit torque and advanced limit torque, wherein the judgment conditions for each level of fault torque limiting may be determined according to relevant standards. Similarly, the preset limit torque corresponding to each level of fault torque limiting may be determined according to relevant standards, for example, the preset limit torque corresponding to the primary limit torque is less than or equal to 75% of the external characteristic maximum torque of the engine. The preset limit torque corresponding to the intermediate limit torque is less than or equal to 65% of the external characteristic maximum torque of the engine. The preset limit torque corresponding to the advanced limit torque is less than or equal to 50% of the external characteristic maximum torque of the engine.

[0035] S2: Determine a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, so that the sum of the first target driving torque and the second target driving torque is equal to the required driving torque.

[0036] After the torque limit level is determined, the driving torque of the engine and / or motor can be determined based on the preset limit torque corresponding to the torque limit level and the required driving torque of the hybrid vehicle to determine the power source and the driving torque of each power source.

[0037] Specifically, the power source determined in S2 may be one or two. For example, the power source determined in S2 may be an engine, an electric motor, or both an engine and an electric motor.

[0038] Specifically, the sum of the driving torques of the determined power sources is equal to the required driving torque of the hybrid vehicle. For example, when S2 determines that the engine is the power source, the first target driving torque of the engine is equal to the required driving torque of the hybrid vehicle, and the second target driving torque is 0. When the power source determined in S2 is the motor, the second target driving torque of the motor is equal to the required driving torque of the hybrid vehicle, and the first target driving torque is 0. When the power sources determined in S2 are the motor and the engine, the sum of the first target driving torque of the engine and the second target driving torque of the motor is equal to the required driving torque of the hybrid vehicle.

[0039] S3: controlling the engine to output a first target driving torque;

[0040] S4: Control the motor to output a second target driving torque.

[0041] After the power source and the driving torque corresponding to each power source are determined in S2, the electric motor can be controlled to output the first target driving torque, and the electric motor can be controlled to output the second target driving torque, so that the sum of the first target driving torque and the second target driving torque is equal to the required driving torque of the hybrid vehicle to drive the driving element to move.

[0042] The torque distribution method under engine fault torque limiting provided by the present application is to formulate the level of fault torque limiting, the judgment conditions corresponding to each level of fault torque limiting, and the corresponding preset limit torque in advance according to relevant standards. During the operation of the hybrid vehicle, the relevant parameters are detected at all times, and whether fault torque limiting occurs and the torque limiting level of the fault torque limiting are determined according to the preset judgment conditions of the fault torque limiting, and then the power source and the target torque of each power source are determined according to the preset limit torque corresponding to the torque limiting level and the required driving torque of the hybrid vehicle, so that the sum of the target torques of at least one power source is equal to the required driving torque of the hybrid vehicle. When the engine has a fault torque limiting, the motor can be fully utilized to compensate for the corresponding driving torque, which can not only fully utilize the motor, but also reduce the working time of the engine, thereby ensuring the overall vehicle economy of the hybrid vehicle.

[0043] Optionally, there are two levels of torque limit, namely primary torque limit and advanced torque limit. The following describes the specific torque distribution methods when the torque limit level of the fault torque limit is primary torque limit and advanced torque limit.

[0044] In one embodiment of the present application, Figure 3 As shown, when the torque limit level of the engine's fault torque limit is the primary torque limit, the specific torque distribution method, that is, S2 (determining the first target driving torque of the engine and the second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle) specifically includes the following steps:

[0045] S20: Determine that the torque limit level of the fault torque limit is the primary torque limit;

[0046] Specifically, the torque limit level of the fault torque limit can be determined according to the specific judgment conditions of the preset primary torque limit. The specific judgment conditions can be the conditions specified in the relevant standards, or can be set according to the provisions of the relevant standards.

[0047] When the torque limit level of the fault torque limit is determined to be the primary torque limit, the preset limit torque corresponding to the primary torque limit can be determined. For example, the preset limit torque corresponding to the primary torque limit is equal to 75% of the external characteristic maximum torque of the engine.

[0048] S21: determining whether the required driving torque of the hybrid vehicle is greater than a preset limit torque corresponding to the primary limit torque;

[0049] When the judgment result of S21 is no, that is, the required driving torque of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the primary limit torque, S25 is executed.

[0050] When the judgment result of S21 is yes, that is, the required driving force of the hybrid vehicle is greater than the preset limit torque, S22-S24 are executed.

[0051] S22: determining a preset limit torque as a first target driving torque of the engine;

[0052] When the required driving torque of the hybrid vehicle is greater than the preset limit torque corresponding to the primary torque limit, the preset limit torque corresponding to the primary torque limit is determined as the first target driving torque of the engine, that is, the engine is running at full load. That is, no matter how much the current driving torque of the engine is, the driving torque of the engine (that is, the first target driving torque) is determined as the preset limit torque corresponding to the primary torque limit, so that the engine is running at full load.

[0053] S23: calculating the motor compensation torque according to the preset limit torque and the current driving torque of the engine;

[0054] Since the required torque of the hybrid vehicle is greater than the preset limit torque, the motor compensates for the remaining torque that is limited by the limit torque. That is, the motor compensation torque is calculated based on the preset limit torque and the current driving torque of the engine. The motor compensation torque is equal to the difference between the preset limit torque of the engine and the current driving torque.

[0055] S24: Determine a second target driving torque of the motor according to the current driving torque of the motor and the motor compensation torque.

[0056] Specifically, the current driving torque of the motor is the driving torque of the motor before torque compensation at the current moment. The current driving torque of the motor may be determined according to the current driving mode. If the current driving mode is a pure engine driving mode, the current driving torque of the motor is 0. If the current driving mode is a hybrid driving mode, the current driving torque of the motor is equal to the current driving torque of the motor in the current hybrid driving mode.

[0057] At this time, the motor compensation torque is compensated to the motor, that is, the sum of the current driving torque of the motor and the motor compensation torque is used together as the second target driving torque of the motor.

[0058] When the torque limit level of the fault torque limiter is the primary torque limiter, if the required torque of the hybrid vehicle is greater than the preset limit torque corresponding to the primary torque limiter, the engine runs at full load and the motor is controlled to compensate for the remaining torque.

[0059] S25: Determine the current driving torque of the engine as the first target driving torque of the engine, and determine the current torque of the motor as the second target driving torque of the motor.

[0060] If the required torque of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the primary limit torque, the distribution method of the driving torque corresponding to the driving torque corresponding to the current driving mode is not changed, and the motor does not need to further compensate the torque.

[0061] Optionally, after S24 (determining the second target driving torque of the motor according to the current driving torque of the motor and the motor compensation torque), the torque distribution method further includes the following steps:

[0062] S252: When the state of charge value of the power battery is less than a preset threshold value, determining that the first target driving torque of the engine is a preset limit torque corresponding to the high-level torque limit.

[0063] After the motor is used for torque compensation, the state of charge of the power battery is monitored at all times. If the state of charge of the power battery is less than the preset threshold, it means that the power battery is difficult to provide electrical energy to the motor. In this case, the first target driving torque of the engine is determined to be the preset limit torque corresponding to the advanced torque limit, that is, the engine works at maximum power and the hybrid vehicle is driven purely by the engine.

[0064] In this application, when the torque limit level of the fault torque limit is the primary torque limit, if the demand torque of the hybrid vehicle is greater than the preset limit torque corresponding to the primary torque limit, the engine runs at full load, the motor is controlled to compensate for the remaining torque, and the motor is used to supplement the missing part of the vehicle power. When the demand torque is small, the economy of the vehicle is guaranteed as much as possible. If the demand torque of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the primary torque limit, the distribution method of the driving torque corresponding to the current driving mode is not changed, and the motor does not need to further compensate the torque.

[0065] In another embodiment of the present application, Figure 4 As shown, when the torque limit level of the engine's fault torque limit is the primary torque limit, the specific torque distribution method, that is, S2 (determining the first target driving torque of the engine and the second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle) specifically includes the following steps:

[0066] S26: Determine that the torque limit level is the advanced torque limit and the driving mode of the hybrid vehicle is the hybrid mode;

[0067] Similarly, the torque limit level of the fault torque limit can be determined according to the specific judgment conditions of the preset high-level torque limit. When the torque limit level of the fault torque limit is determined to be the high-level torque limit, the preset limit torque corresponding to the high-level torque limit can be determined, for example, the preset limit torque corresponding to the high-level torque limit is equal to 50% of the external characteristic maximum torque of the engine.

[0068] The hybrid mode refers to the current driving mode of the hybrid vehicle in which the engine and the motor are driven together.

[0069] S27: Determine whether the state of charge value of the power battery is equal to 100%;

[0070] When the judgment result of S27 is yes, that is, the charge state value of the power battery is equal to 100%, which means that the power battery is fully charged. At this time, the driving mode of the hybrid vehicle is switched to the pure electric mode, and the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle, that is, S28 is executed.

[0071] When the judgment result of S27 is no, that is, when the state of charge value of the power battery is less than 100%, S290-S296 are executed.

[0072] S28: Switching the pure electric mode to the hybrid mode, and determining the first target driving torque of the motor as the required torque of the hybrid vehicle.

[0073] When the power battery is fully charged, the hybrid mode of the hybrid vehicle is switched to the pure electric mode, and the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle, that is, the current driving mode of the hybrid vehicle is switched to the pure electric mode.

[0074] S290: determining whether the required driving torque of the hybrid vehicle is greater than a preset limit torque corresponding to the advanced torque limit;

[0075] When the judgment result of S290 is yes, that is, the required driving torque of the hybrid vehicle is greater than the preset limit torque corresponding to the high-level torque limit, S291-293 is executed.

[0076] When the judgment result of S290 is no, that is, the required driving force of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the high-level torque limit, S294-296 is executed.

[0077] S291: Determine that the first target driving torque of the engine is a preset limit torque corresponding to the high-level torque limit;

[0078] When the required driving torque of the hybrid vehicle is greater than the preset limit torque corresponding to the high-level torque limit, the preset limit torque corresponding to the high-level torque limit is determined as the first target driving torque of the engine, that is, the engine is running at full load. That is, no matter how much the current driving torque of the engine is, the driving torque of the engine (that is, the first target driving torque) is determined as the preset limit torque corresponding to the high-level torque limit, so that the engine works at maximum power.

[0079] S292: Calculating the motor compensation torque according to the state of charge value of the power battery and the duration of the fault torque limit;

[0080] When the power battery is greater than not fully charged and the state of charge value of the power battery is greater than a preset threshold, it means that the power battery can be used as a power source to provide electrical energy for the motor to output power to the drive component cloud. That is, the motor can be used to provide kinetic energy for the drive component.

[0081] At this time, the motor compensation torque can be determined based on the charge state value of the power battery and the duration of the fault torque limitation.

[0082] Specifically, the duration of the fault torque limitation is the duration between the current moment and the moment when the fault torque limitation occurs.

[0083] Optionally, a fault torque limiting compensation database can be pre-built, which includes the charge state value of the power battery, the duration of the fault torque limiting, and the corresponding motor compensation torque; then, the fault torque limiting compensation database is queried for the motor compensation torque that matches the charge state value of the power battery and the duration of the fault torque limiting.

[0084] Optionally, the higher the state of charge value of the power battery, the greater the motor compensation torque. The longer the duration of the fault torque limit occurs, the less the motor supplement torque.

[0085] S293: Calculate a second target driving torque of the motor according to the current driving torque of the motor and the motor compensation torque.

[0086] After the motor compensation torque is determined, the second target driving torque of the motor may be calculated according to the current driving torque of the motor and the motor compensation torque.

[0087] That is, in this application, when the high-level torque limit is in effect, if the power battery is fully charged, the hybrid mode is directly switched to the pure electric drive mode, that is, the second target drive torque of the motor is the required torque of the hybrid vehicle. If the power battery is not fully charged and the state of charge value is greater than the preset threshold, the engine operates at maximum power, and then the motor compensation torque is determined according to the state of charge value and the duration of the fault torque limit, and the motor compensates the torque.

[0088] S294: Determine a preset limit torque corresponding to the high-level torque limit as a first target driving torque of the engine;

[0089] When the required driving force of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the high-level torque limit, the preset limit torque corresponding to the high-level torque limit is determined as the first target driving torque of the engine, that is, the engine works at maximum power.

[0090] S295: Calculating the power generation torque according to the preset limit torque corresponding to the advanced torque limiter and the required torque of the hybrid vehicle;

[0091] At the same time, the engine provides power to the motor so that the electrodes generate electricity and store the electricity in the power battery to charge the power battery. When charging the power battery, the state of charge of the power battery is monitored at all times. When the state of charge of the power battery is 100%, it switches to the pure electric mode and executes S27-S28. If the state of charge of the power battery is not fully charged, continue to execute S27-S290-S296.

[0092] S296: Control the motor to generate electricity with the power generation torque to charge the power battery. In this application, when the demand drive of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the advanced torque limit, the engine works at maximum power, and at the same time the motor uses the remaining torque of the engine to generate electricity. The power generation torque is the difference between the maximum torque of the engine after being limited and the required torque of the whole vehicle, so that the engine can be fully charged as soon as possible under the condition of severe torque limit.

[0093] Optionally, after the hybrid mode is switched to the pure electric mode in S28, i.e., S28 (switching the pure electric mode to the hybrid mode, and determining the first target driving torque of the motor as the required torque of the hybrid vehicle), the torque distribution method of the present application further includes the following steps:

[0094] S280: When the state of charge value of the power battery is less than a preset threshold value, the pure electric mode is switched to the hybrid mode, and the first target driving torque of the engine is determined to be a preset limit torque corresponding to the high-level torque limit.

[0095] When the hybrid mode of the hybrid vehicle is switched to the pure electric mode, the power battery provides power for the driving element. During the operation of the hybrid vehicle, the state of charge of the power battery is constantly detected, and it is determined whether the state of charge of the power battery is less than the preset threshold. If the state of charge of the power battery is greater than or equal to the preset threshold, the pure electric mode continues to be used. If the state of charge of the power battery is less than the preset threshold, the pure electric mode is switched to the hybrid mode, and the first target driving torque of the engine is determined to be the preset limit torque corresponding to the advanced torque limit.

[0096] As a second aspect of the present application, the present application also provides a torque distribution controller under engine fault torque limiting, such as Figure 5 As shown, a torque distribution controller 1 under engine fault torque limitation includes:

[0097] The torque limit level determination module 10 is used to determine the preset torque limit level corresponding to the torque limit level according to the torque limit level of the torque limit level when the engine has torque limit failure;

[0098] The torque distribution module 11 is used to determine a first target driving torque of the engine and / or a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle;

[0099] The control module 12 is used to control the engine to output a first target driving torque; and / or control the motor to output a second target driving torque.

[0100] The torque distribution controller under engine fault torque limiting provided by the present application pre-determines the level of fault torque limiting, the judgment conditions corresponding to each level of fault torque limiting, and the corresponding preset limit torque according to relevant standards. During the operation of the hybrid vehicle, the relevant parameters are constantly detected, and whether fault torque limiting occurs and the torque limiting level of the fault torque limiting are determined according to the preset judgment conditions of the fault torque limiting, and then the power source and the target torque of each power source are determined according to the preset limit torque corresponding to the torque limiting level and the required driving torque of the hybrid vehicle, so that the sum of the target torques of at least one power source is equal to the required driving torque of the hybrid vehicle. When the engine has a fault torque limiting, the motor can be fully utilized to compensate for the corresponding driving torque, which can not only fully utilize the motor, but also reduce the working time of the engine, thereby ensuring the overall vehicle economy of the hybrid vehicle.

[0101] The method in the present application can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions, and when the computer programs or instructions are loaded and executed on a computer, the process or function described in the present application is executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM or other programmable device.

[0102] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0103] The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0104] In addition, the embodiment of the present application may also be a storage medium, on which a computer program is stored, and the computer program is executed by a processor to execute the steps of a torque distribution method under engine fault torque limitation described in any of the above embodiments of this specification:

[0105] For the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0106] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0107] The steps in the methods of the embodiments of the present application can be adjusted in order, combined and deleted according to actual needs, and the technical features recorded in the embodiments can be replaced or combined. The devices in the embodiments of the present application can be combined, divided and deleted according to actual needs.

[0108] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0109] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly by hardware, software units executed by a processor, or a combination of the two. The software units may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0110] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0111] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A torque distribution method under engine fault torque limitation, characterized in that: Applied to a hybrid vehicle, the hybrid vehicle comprises: an engine, a power battery and a motor; wherein the torque distribution method comprises: When the engine is torque limited due to a fault, determining a preset torque limit corresponding to the torque limit level according to the torque limit level of the torque limited due to the fault; determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, so that a sum of the first target driving torque and the second target driving torque is equal to the required driving torque of the hybrid vehicle; controlling the engine to output the first target driving torque; The motor is controlled to output the second target driving torque.

2. The torque distribution method according to claim 1, characterized in that: Determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle includes: When the torque limit level is the primary torque limit, and the required driving torque of the hybrid vehicle is greater than the preset limit torque corresponding to the primary torque limit, determining the preset limit torque as the first target driving torque of the engine; calculating a motor compensation torque according to the preset limit torque and the current driving torque of the engine; A second target driving torque of the motor is determined according to the current driving torque of the motor and the motor compensation torque.

3. The torque distribution method according to claim 2, characterized in that: Determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, further comprising: When the torque limit level is the primary torque limit and the required torque of the hybrid vehicle is less than or equal to the preset limit torque corresponding to the primary torque limit, determining the current driving torque of the engine as the first target driving torque of the engine; A current driving torque of the motor is determined as a second target driving torque of the motor.

4. The torque distribution method according to claim 1, characterized in that: Determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle includes: When the torque limit level is high torque limit, and the hybrid vehicle is in hybrid mode, and when the state of charge of the power battery is 100%, the hybrid mode is switched to pure electric mode, and the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle.

5. The torque distribution method according to claim 4, characterized in that: When the torque limit level is the advanced torque limit, and the hybrid vehicle is in the hybrid mode, and when the state of charge of the power battery is 100%, the second target driving torque of the motor is determined to be the required torque of the hybrid vehicle, and then the torque distribution method further includes: When the state of charge value of the power battery is less than a preset threshold value, the pure electric mode is switched to the hybrid mode, and the first target driving torque of the engine is determined to be the preset limit torque corresponding to the high-level torque limit.

6. The torque distribution method according to claim 4, characterized in that: Determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, further comprising: When the torque limit level is a high-level torque limit, and the hybrid vehicle is in a hybrid mode, and the state of charge value of the power battery is greater than a preset threshold value and less than 100%, and the preset limit torque corresponding to the high-level torque limit of the engine is less than the required torque of the hybrid vehicle, determining the first target driving torque of the engine to be the preset limit torque corresponding to the high-level torque limit; Determining the motor compensation torque according to the state of charge value of the power battery and the duration of the fault torque limit; A second target driving torque of the motor is calculated according to the current driving torque of the motor and the motor compensation torque.

7. The torque distribution method according to claim 6, characterized in that: The motor compensation torque is calculated according to the state of charge value of the power battery and the duration of the fault torque limit, including: Constructing a fault torque limiting compensation database, wherein the fault torque limiting compensation database includes a state of charge value of the power battery, a duration of the fault torque limiting, and a corresponding motor compensation torque; The motor compensation torque that matches the state of charge value of the power battery and the duration of the fault torque limitation is queried in the fault torque limitation compensation database.

8. The torque distribution method according to claim 4, characterized in that: Determining a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle, further comprising: When the torque limit level is a high-level torque limit, and the hybrid vehicle is in a hybrid mode, and the state of charge value of the power battery is greater than a preset threshold value and less than 100%, and the preset limit torque corresponding to the high-level torque limit of the engine is greater than the required torque of the hybrid vehicle, determining the preset limit torque corresponding to the high-level torque limit as the first target driving torque of the engine; Calculating the power generation torque according to the preset limit torque corresponding to the advanced torque limiter and the required torque of the hybrid vehicle; The motor is controlled to generate electricity with the power generation torque to charge the power battery.

9. A torque distribution controller under engine fault torque limit, characterized in that: include: A torque limit level determination module, used for determining a preset torque limit corresponding to the torque limit level according to the torque limit level of the torque limit when the engine has torque limit failure; a torque distribution module, configured to determine a first target driving torque of the engine and a second target driving torque of the motor according to the torque limit level and the corresponding preset limit torque and the required driving torque of the hybrid vehicle; A control module is used to control the engine to output the first target driving torque; and control the motor to output the second target driving torque.

10. A hybrid vehicle, characterized in that: include: engine; a motor, a power input shaft of the motor being connected to a power output shaft of the engine, and a power battery, the motor being connected to the power battery; as well as The torque distribution controller as claimed in claim 9.

Images