Engine Combustion Judgment Method, Device, Equipment and Storage Medium

Abstract

The present application discloses an engine combustion judgment method, device, equipment and storage medium, relating to the technical field of vehicles. The disclosed engine combustion judgment method includes: when the requested torque of a target generator meets the combustion judgment enabling condition corresponding to the power split mode, obtaining the engine acting torque, the target generator acting torque and the ring gear acting torque; determining the planetary gear set torque resultant force according to the engine acting torque, the target generator acting torque and the ring gear acting torque; judging the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determining the combustion state of the target engine according to the state judgment result. By the above method, the combustion state of the engine in the power split mode can be accurately identified, whether the engine is actually combusting can be determined, the situation of post-combustion erosion and blockage of the catalyst can be avoided, and the safety of the hybrid control system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to an engine combustion judgment method, device, equipment and storage medium. Background Art

[0002] In a hybrid vehicle, there are multiple power sources. In addition to the engine, there are also a generator and a drive motor that can both provide power sources. When certain faults occur in the engine or when it is approaching fuel shortage, in the case of no combustion or incomplete combustion, the vehicle can still output torque through the drive motor to move forward. The engine can still run at a high speed under the drive of the generator. If the combustion state of the engine cannot be accurately identified, it will cause too much unburned fuel to enter the catalyst, and spontaneous combustion will occur when the catalyst and temperature reach a certain level, which may seriously lead to catalyst ablation and blockage. In the current market's hybrid powertrain architectures, the main operating modes of the engine are: series, parallel, and power split. In the power split mode, the engine, generator, and drive motor are always in a coupled relationship, and the speed and torque among the three affect each other. However, currently, there is only a combustion judgment for the engine in the series and parallel modes of the vehicle, and there is an urgent need for an accurate judgment method for the combustion state of the engine in the power split mode.

[0003] The above content is only used to assist in understanding the technical solution of the present application, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present application is to provide an engine combustion judgment method, device, equipment and storage medium, aiming to solve the technical problem in the prior art that the combustion state of the engine in the power split mode cannot be accurately judged.

[0005] To achieve the above purpose, the present application proposes an engine combustion judgment method, and the method includes:

[0006] When the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode, obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque;

[0007] Determine the planetary gear set torque resultant force according to the engine acting torque, the target generator acting torque, and the ring gear acting torque;

[0008] Judge the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determine the combustion state of the target engine according to the state judgment result.

[0009] In an embodiment, before obtaining the engine acting torque, the target generator acting torque, and the ring gear acting torque, it further includes:

[0010] Obtain the calculated engine torque, the output torque of the target generator, and the current acceleration;

[0011] Perform torque calculation based on the calculated engine torque to determine the engine acting torque;

[0012] Perform torque calculation based on the output torque to determine the target generator acting torque;

[0013] Perform torque calculation based on the current acceleration to determine the ring gear acting torque.

[0014] In one embodiment, the performing torque calculation based on the calculated engine torque to determine the engine acting torque includes:

[0015] Obtain the engine moment of inertia and the engine speed change rate of the target engine;

[0016] Determine the engine inertia acting force of the target engine based on the engine moment of inertia and the engine speed change rate;

[0017] Perform torque calculation based on the engine inertia acting force and the calculated engine torque to determine the engine acting torque.

[0018] In one embodiment, the performing torque calculation based on the output torque to determine the target generator acting torque includes:

[0019] Obtain the generator moment of inertia of the target generator, the generator speed change rate of the target generator, and the first transmission coefficient;

[0020] Determine the generator inertia acting force of the target generator based on the generator moment of inertia and the generator speed change rate;

[0021] Perform torque calculation based on the generator inertia acting force, the first transmission coefficient, and the output torque to determine the target generator acting torque.

[0022] In one embodiment, the performing torque calculation based on the current acceleration to determine the ring gear acting torque includes:

[0023] Obtain the curb weight of the vehicle, the vehicle tire radius, and the second transmission coefficient;

[0024] Perform torque calculation based on the curb weight of the vehicle, the vehicle tire radius, the second transmission coefficient, and the current acceleration to determine the ring gear acting torque.

[0025] In one embodiment, the judging the combustion state of the target engine based on the planetary gear set torque resultant force and the torque resultant force threshold, and determining the combustion state of the target engine according to the state judgment result includes:

[0026] Judge the combustion state of the target engine according to the planetary gear train torque resultant force and the torque resultant force threshold value;

[0027] When the state judgment result is that the absolute value of the planetary gear train torque resultant force is greater than the torque resultant force threshold value, determine the state duration;

[0028] When the state duration is greater than the duration threshold value, determine that the combustion state of the target engine is an unburned state.

[0029] In one embodiment, after judging the combustion state of the target engine according to the planetary gear train torque resultant force and the torque resultant force threshold value, it further includes:

[0030] When the state judgment result is that the absolute value of the planetary gear train torque resultant force is not greater than the torque resultant force threshold value, determine that the combustion state of the target engine is a normal combustion state.

[0031] In one embodiment, before obtaining the engine acting torque, the target generator acting torque, and the ring gear acting torque when the requested torque of the target generator meets the combustion judgment enabling condition of the power split mode, it further includes:

[0032] Determine the current operating mode according to the vehicle mode control information;

[0033] When the current operating mode is the power split mode, obtain the requested torque of the target generator;

[0034] When the absolute value of the requested torque of the target generator is less than the requested torque threshold value, determine that the requested torque of the target generator meets the combustion judgment enabling condition in the power split mode.

[0035] In one embodiment, after judging the combustion state of the target engine according to the planetary gear train torque resultant force and the torque resultant force threshold value, and determining the combustion state of the target engine according to the state judgment result, it further includes:

[0036] When the combustion state of the target engine is an unburned state, generate a combustion warning message according to the planetary gear train torque resultant force;

[0037] Send the combustion warning message to the vehicle display interface for combustion state warning.

[0038] In addition, to achieve the above object, the present application also proposes an engine combustion judgment device, the engine combustion judgment device includes: an acquisition module, configured to acquire the engine acting torque, the target generator acting torque, and the ring gear acting torque when the requested torque of the target generator meets the combustion judgment enabling condition of the power split mode;

[0039] A processing module, configured to determine the resultant torque of the planetary gear set according to the engine acting torque, the target generator acting torque, and the ring gear acting torque.

[0040] A judgment module, configured to judge the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant force threshold, and determine the combustion state of the target engine according to the state judgment result.

[0041] In addition, to achieve the above object, the present application further provides an engine combustion judgment device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the computer program is configured to implement the steps of the engine combustion judgment method as described above.

[0042] In addition, to achieve the above object, the present application further provides a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the engine combustion judgment method as described above are implemented.

[0043] The present application provides an engine combustion judgment method. When the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode, the present application acquires the engine acting torque, the target generator acting torque, and the ring gear acting torque; determines the resultant torque of the planetary gear set according to the engine acting torque, the target generator acting torque, and the ring gear acting torque; judges the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant force threshold, and determines the combustion state of the target engine according to the state judgment result. By the above method, when the requested torque meets the combustion judgment enabling condition corresponding to the power split mode, the resultant torque of the planetary gear set is calculated based on multiple torques, and the combustion state is judged by the resultant torque of the planetary gear set and the torque resultant force threshold, so that the combustion state of the engine can be accurately identified in the power split mode, it can be determined whether the engine is actually burning, avoiding the situation of catalyst post-combustion erosion and blockage, and improving the safety of the hybrid control system. Description of the Drawings

[0044] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application and used together with the description to explain the principles of the present application.

[0045] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic flowchart provided for the first embodiment of the engine combustion judgment method of this application;

[0047] Figure 2 It is a schematic flowchart provided for the second embodiment of the engine combustion judgment method of this application;

[0048] Figure 3 It is a schematic flowchart provided for the third embodiment of the engine combustion judgment method of this application;

[0049] Figure 4 It is a schematic flowchart provided for the fourth embodiment of the engine combustion judgment method of this application;

[0050] Figure 5 It is a schematic flowchart of the brief process of the engine combustion judgment method provided for the fourth embodiment of this application;

[0051] Figure 6 It is a schematic diagram of the module structure of the engine combustion judgment device in the embodiment of this application;

[0052] Figure 7 It is a schematic diagram of the device structure of the hardware operating environment involved in the engine combustion judgment method in the embodiment of this application.

[0053] The realization of the purpose, functional features, and advantages of this application will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments

[0054] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not used to limit this application.

[0055] For a better understanding of the technical solutions of this application, the following will be described in detail in combination with the accompanying drawings of the specification and specific embodiments.

[0056] The main solution of the embodiment of this application is: when the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode, obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque; determine the planetary gear set torque resultant force according to the engine acting torque, the target generator acting torque, and the ring gear acting torque; judge the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determine the combustion state of the target engine according to the state judgment result.

[0057] When certain faults occur in the engine or when it is approaching fuel shortage, and there is no combustion or incomplete combustion, the vehicle can still move forward by the output torque of the drive motor. The engine can still operate at high speed driven by the generator. If the combustion state of the engine cannot be accurately identified, it will cause too much unburned fuel to enter the catalyst, and spontaneous combustion will occur when the catalyst and temperature reach a certain level, which may seriously lead to catalyst ablation and blockage. In the current market's hybrid powertrain architectures, the main operating modes of the engine are: series, parallel, and power split. In the power split mode, the engine, generator, and drive motor are always in a coupled relationship, and the rotational speeds and torques among the three affect each other. However, currently, there is only a combustion judgment for the engine in the vehicle's series mode and parallel mode. There is an urgent need for an accurate method for judging the combustion state of the engine in the power split mode.

[0058] In this application, when the requested torque meets the combustion judgment enabling condition corresponding to the power split mode, the planetary gear set torque resultant force is calculated based on multiple torques, and the combustion state is judged through the planetary gear set torque resultant force and the torque resultant force threshold, which can accurately identify the combustion state of the engine in the power split mode, determine whether the engine is actually burning, avoid the situation of catalyst post-combustion ablation and blockage, and improve the safety of the hybrid control system.

[0059] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, an engine combustion judgment device, etc. that can implement the above functions. Hereinafter, taking the engine combustion judgment device as an example, this embodiment and the following embodiments will be described.

[0060] Based on this, the embodiment of this application provides an engine combustion judgment method, referring to Figure 1 , Figure 1 which is a schematic flowchart of the first embodiment of the engine combustion judgment method of this application.

[0061] In this embodiment, the method includes steps S10 to S30:

[0062] Step S10, when the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode, obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque;

[0063] It should be noted that in this embodiment, the combustion judgment enabling condition corresponding to the power split mode refers to that the absolute value |M P1-Req | of the requested torque M of the P1 generator P1-Req is less than a certain value M K1 . The target generator refers to the P1 generator in the hybrid control system. The engine acting torque MP-ice Refers to the engine acting torque on the planetary gear set, and the target generator acting torque M P-P1 Refers to the P1 generator acting torque on the planetary gear set, and the ring gear acting torque M P-Ring Refers to the ring gear acting torque on the planetary gear set. In this embodiment, M K1 Is a pre-set requested torque threshold value.

[0064] It can be understood that when the vehicle enters the power split mode and the engine cannot burn, to maintain the target speed control, the requested torque M of the P1 generator P1-Req Will fluctuate within a small range to control and adjust the engine speed. Determine whether the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode. If so, obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque; if not, exit the combustion judgment of the engine.

[0065] Step S20, determine the resultant torque of the planetary gear set according to the engine acting torque, the target generator acting torque, and the ring gear acting torque;

[0066] It should be noted that based on the engine acting torque M P-ice , the target generator acting torque M P-P1 , and the ring gear acting torque M P-Ring , the resultant torque of the acting torque on the planetary gear set M P = M P-ice + M P-P1 + M P-Ring .

[0067] Step S30, judge the combustion state of the target engine according to the resultant torque of the planetary gear set and the resultant torque threshold value, and determine the combustion state of the target engine according to the state judgment result.

[0068] It should be noted that usually when the engine calculation torque is accurate, the resultant torque of the acting torque on the planetary gear set M P Is close to zero or within a certain torque range. If |M P | is greater than a certain value M K2 , and lasts for a certain time T, then it is judged that the engine is in an unburned state. Otherwise, it means that the engine is in a normal combustion state. In this embodiment, the unburned state includes two states: unable to burn and incomplete combustion. M K2 Is a pre-set resultant torque threshold value. The target engine refers to the engine whose combustion state needs to be judged in the hybrid control system.

[0069] In a feasible implementation manner, after step S30, steps A11 to A12 may further be included:

[0070] Step A11, when the combustion state of the target engine is the unburned state, generate a combustion warning message according to the resultant torque of the planetary gear set;

[0071] Step A12, send the combustion warning message to the vehicle display interface for warning of the combustion state.

[0072] It should be noted that when the combustion state of the target engine is the unburned state, a combustion warning message is generated based on the resultant torque of the planetary gear set and the duration for which the resultant torque of the planetary gear set is greater than the torque resultant threshold, and a warning sign is generated based on the combustion warning message. The warning sign is displayed through the vehicle display interface, and at the same time, the combustion warning message is sent to the user's terminal. The user can intuitively understand the combustion warning message through the user's terminal, so that the user can know the combustion state of the target engine, thereby completing the warning of the combustion state of the target engine.

[0073] In this embodiment, when the combustion state of the target engine is the unburned state, a combustion warning message is generated according to the resultant torque of the planetary gear set; the combustion warning message is sent to the vehicle display interface for warning of the combustion state. In the above manner, the user can intuitively and timely know the combustion state of the engine and take corresponding measures, ensuring the safety of the hybrid control system.

[0074] This embodiment provides an engine combustion determination method. In this embodiment, when the requested torque of the target generator satisfies the combustion determination enabling condition corresponding to the power split mode, the engine acting torque, the target generator acting torque, and the ring gear acting torque are obtained; the resultant torque of the planetary gear set is determined according to the engine acting torque, the target generator acting torque, and the ring gear acting torque; the combustion state of the target engine is judged according to the resultant torque of the planetary gear set and the torque resultant threshold, and the combustion state of the target engine is determined according to the state judgment result. In the above manner, when the requested torque satisfies the combustion determination enabling condition corresponding to the power split mode, the resultant torque of the planetary gear set is calculated based on multiple torques, and the combustion state is judged through the resultant torque of the planetary gear set and the torque resultant threshold, which can accurately identify the combustion state of the engine in the power split mode, determine whether the engine is actually burning, avoid the situation of catalyst post-combustion erosion and blockage, and improve the safety of the hybrid control system.

[0075] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar content as that in the above-mentioned first embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 2 , before obtaining the engine acting torque, the target generator acting torque, and the ring gear acting torque in step S10, the engine combustion determination method further includes steps S11 to S14:

[0076] Step S11, obtain the engine calculated torque, the output torque of the target generator, and the current acceleration;

[0077] It should be noted that in the engine control system, the engine calculated torque M ice , is mainly calculated based on the actual intake air volume, the actual controlled fuel injection volume under the fuel conversion air-fuel ratio calibrated on the test bench, and the actual controlled ignition angle under the corresponding working conditions. However, the system cannot monitor whether the fuel injector or the ignition device actually injects fuel or ignites. But in the target speed control of the hybrid control system, the engine output torque is adjusted by adjusting the engine intake air volume. If there is a fault in the engine fuel injection system or ignition system, it will cause a large difference between the engine calculated torque M ice and the actual torque. When the engine cannot burn, the actual torque will be the engine running resistance torque.

[0078] It can be understood that the output torque of the target generator refers to the torque M of the P1 generator P1-Act . The motor control system can monitor the authenticity of the P1 generator torque in real time, and the torque M P1-Act of the P1 generator usually has higher torque accuracy than the engine control torque and has good followability. M P1-Act basically follows the requested torque M of the P1 generator P1-Req .

[0079] In a specific implementation, the current acceleration refers to the acceleration of the vehicle at this time. When the vehicle is moving at a constant speed, the acceleration is 0, and the current acceleration is a vector with a direction.

[0080] Step S12, perform torque calculation based on the engine calculated torque to determine the engine acting torque;

[0081] It should be noted that by using the engine calculated torque M ice , combined with the inertial force acting on the change of the target engine speed, the engine acting torque M P-ice can be calculated.

[0082] In a feasible implementation manner, step S12 may include steps B11 to B13:

[0083] Step B11, obtain the engine moment of inertia and the engine speed change rate of the target engine;

[0084] Step B12, determine the engine inertial force acting on the target engine according to the engine moment of inertia and the engine speed change rate;

[0085] Step B13, perform torque calculation according to the engine inertial force and the engine calculated torque to determine the engine acting torque.

[0086] It should be noted that, according to the engine moment of inertia J of the target engine ice and the engine speed change rate dn ice determine the inertia acting force J of the target engine speed change ice ×dn ice ×2π / 60. The inertia acting force of the target engine speed change is the engine inertia acting force of the target engine.

[0087] It can be understood that through the engine inertia acting force J of the target engine ice ×dn ice ×2π / 60, combined with the engine calculated torque M ice perform the calculation of the engine acting torque, and obtain the engine acting torque M on the planetary gear set P-ice =M ice +J ice ×dn ice ×2π / 60.

[0088] In this embodiment, by obtaining the engine moment of inertia and the engine speed change rate of the target engine; determining the engine inertia acting force of the target engine according to the engine moment of inertia and the engine speed change rate; performing torque calculation according to the engine inertia acting force and the engine calculated torque to determine the engine acting torque. Through the above method, the accuracy of the engine acting torque is ensured, laying a foundation for the subsequent torque resultant force to accurately reflect the combustion state of the engine.

[0089] The above is only one feasible implementation manner of step S12 provided in this embodiment. The specific implementation manner of step S12 in this embodiment is not specifically limited.

[0090] Step S13, perform torque calculation according to the output torque to determine the target generator acting torque;

[0091] It should be noted that by using the output torque M of the target generator P1-Act , combined with the inertia acting force of the P1 generator speed change, the target generator acting torque M P-P1 can be calculated.

[0092] In a feasible implementation manner, step S13 may include steps C11 to C13:

[0093] Step C11, obtain the generator moment of inertia of the target generator, the generator speed change rate of the target generator, and the first transmission coefficient;

[0094] Step C12: Determine the inertia force of the target generator based on the generator inertia and the generator speed change rate.

[0095] Step C13: Perform torque calculation based on the generator inertia force, the first transmission coefficient, and the output torque to determine the acting torque of the target generator.

[0096] It should be noted that, based on the generator inertia J P1 of the target generator and the generator speed change rate dn P1 the inertia force J P1 acting on the target generator due to the speed change is determined as J P1 ×dn

[0097] ×2π / 60. The inertia force acting on the target generator due to the speed change is the inertia force of the target generator. P1 ×dn P1 ×2π / 60, combined with the first transmission coefficient K P1 and the output torque M P1-Act of the target generator, the acting torque of the generator is calculated, and the acting torque M P-P1 of the generator on the planetary gear set is obtained as M P1-Act =(M P1 +J P1 ×dn P1 ×2π / 60)×K P1 . In this embodiment, the first transmission coefficient K

[0098] refers to the transmission coefficient of the sun gear torque acting on the planetary gear set, which is determined according to the transmission coefficient of the ECVT (Electrical Continuously Variable Transmission) structure. For example, it is 3.6. The specific value of the first transmission coefficient is not limited in this embodiment.

[0099] The above is only one feasible implementation manner of step S13 provided in this embodiment. The specific implementation manner of step S13 is not specifically limited in this embodiment.

[0100] Step S14: Calculate the torque according to the current acceleration to determine the acting torque of the ring gear.

[0101] It should be noted that when the vehicle is in a steady state of uniform speed, the resultant force acting on the ring gear is almost zero. If the vehicle is accelerating or decelerating, there is an inertia acting force of the ring gear on the planetary gear set. Since the ring gear is coupled with the wheel end, the current acceleration of the vehicle can be used to calculate the acting torque M of the ring gear on the planetary gear set. P-Ring 。

[0102] In a feasible implementation, step S14 may further include steps D11 - D12:

[0103] Step D11: Obtain the curb weight of the vehicle, the radius of the vehicle tire, and the second transmission coefficient.

[0104] Step D12: Calculate the torque according to the curb weight of the vehicle, the radius of the vehicle tire, the second transmission coefficient, and the current acceleration to determine the acting torque of the ring gear.

[0105] It should be noted that torque calculation is performed according to the curb weight M of the vehicle, the radius R of the vehicle tire, the current acceleration a, and the second transmission coefficient K Ring to determine the acting torque M of the ring gear P-Ring = M × a × R / K Ring 。In this embodiment, the second transmission coefficient K Ring refers to the transmission coefficient from the planetary gear set to the wheel end in the power split mode, such as 2.54. The specific value of the second transmission coefficient is not limited in this embodiment.

[0106] In this embodiment, by obtaining the curb weight of the vehicle, the radius of the vehicle tire, and the second transmission coefficient; calculating the torque according to the curb weight of the vehicle, the radius of the vehicle tire, the second transmission coefficient, and the current acceleration to determine the acting torque of the ring gear. In the above manner, the accuracy of the acting torque of the ring gear is ensured, laying a foundation for the subsequent torque resultant force to accurately reflect the combustion state of the engine.

[0107] The above is only one feasible implementation of step S14 provided in this embodiment, and the specific implementation of step S14 in this embodiment is not specifically limited.

[0108] This embodiment provides a method for judging engine combustion. In this embodiment, the engine calculated torque, the output torque of the target generator, and the current acceleration are obtained; torque calculation is performed based on the engine calculated torque to determine the engine acting torque; torque calculation is performed based on the output torque to determine the target generator acting torque; and torque calculation is performed based on the current acceleration to determine the ring gear acting torque. By the above method, the engine acting torque, the target generator acting torque, and the ring gear acting torque can be accurately calculated, laying a foundation for the subsequent torque resultant force to accurately reflect the combustion state of the engine.

[0109] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar content as in the above-mentioned first embodiment and second embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 3 , step S30, the engine combustion judgment method further includes steps S31 to S33:

[0110] Step S31, judging the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold;

[0111] In a feasible implementation manner, after step S31, step E11 may further be included:

[0112] Step E11, when the state judgment result is that the absolute value of the planetary gear set torque resultant force is not greater than the torque resultant force threshold, determining that the combustion state of the target engine is a normal combustion state.

[0113] It should be noted that when the absolute value |M P | of the planetary gear set torque resultant force is not greater than the torque resultant force threshold M K2 ; or when the absolute value |M P | of the planetary gear set torque resultant force is greater than the torque resultant force threshold M K2 , but the duration for which the absolute value |M P | of the planetary gear set torque resultant force is greater than the torque resultant force threshold M K2 does not exceed the set duration threshold T, it indicates that the combustion state of the target engine is a normal combustion state.

[0114] In this embodiment, when the state judgment result is that the absolute value of the planetary gear set torque resultant force is not greater than the torque resultant force threshold, it is determined that the combustion state of the target engine is a normal combustion state. By the above method, the accuracy of the combustion state judgment is ensured.

[0115] Step S32, when the state judgment result is that the absolute value of the planetary gear set torque resultant force is greater than the torque resultant force threshold, determining the state duration;

[0116] Step S33: When the duration of the state is greater than the duration threshold, determine that the combustion state of the target engine is an unburned state.

[0117] It should be noted that usually when the calculated torque of the engine is accurate, the resultant torque M of the planetary gear set P is close to zero or within a certain torque range. If the absolute value |M P | of the resultant torque of the planetary gear set is greater than the torque resultant threshold M K2 and the absolute value |M P | of the resultant torque of the planetary gear set is greater than the torque resultant threshold M K2 and the duration of the absolute value |M P | of the resultant torque of the planetary gear set being greater than the torque resultant threshold M K2 exceeds the set duration threshold T, it indicates that the combustion state of the target engine is an unburned state. In this embodiment, the state duration refers to the duration during which the absolute value |M

[0118] This embodiment provides a method for judging the combustion state of an engine. This embodiment judges the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant threshold; when the state judgment result is that the absolute value of the resultant torque of the planetary gear set is greater than the torque resultant threshold, determine the state duration; when the state duration is greater than the duration threshold, determine that the combustion state of the target engine is an unburned state. Through the above method, the combustion state of the engine can be accurately judged.

[0119] Based on the first embodiment and / or the second embodiment and / or the third embodiment of the present application, in the fourth embodiment of the present application, the same or similar content as in the above-mentioned first embodiment, second embodiment and third embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 Before step S10, the engine combustion judgment method further includes steps S01 to S03:

[0120] Step S01, determine the current operating mode according to the vehicle mode control information;

[0121] It should be noted that the vehicle mode control information includes but is not limited to the mode flag bit corresponding to the current operating mode of the vehicle, vehicle speed, engine operating state, generator operating state and other related information. Determine the current operating mode of the vehicle engine through the vehicle mode control information. The main operating modes of the engine are series, parallel and power split modes, etc.

[0122] Step S02, when the current operating mode is the power split mode, obtain the requested torque of the target generator;

[0123] Step S03, when the absolute value of the requested torque of the target generator is less than the requested torque threshold, it is determined that the requested torque of the target generator meets the combustion judgment enabling condition in the power split mode.

[0124] It should be noted that when the current operating mode of the vehicle engine is the power split mode, the requested torque M of the target generator P1 is obtained P1-Req , when the absolute value |M P1-Req | of the requested torque of the target generator P1 is less than the requested torque threshold MK1, it indicates that the requested torque of the target generator P1 meets the combustion judgment enabling condition in the power split mode. At this time, the judgment of the combustion state of the engine is entered. If |M P1-Req | is not less than the requested torque threshold MK1, the judgment is exited.

[0125] This embodiment provides an engine combustion judgment method. In this embodiment, the current operating mode is determined according to the vehicle mode control information; when the current operating mode is the power split mode, the requested torque of the target generator is obtained; when the absolute value of the requested torque of the target generator is less than the requested torque threshold, it is determined that the requested torque of the target generator meets the combustion judgment enabling condition in the power split mode. Through the above method, it can be accurately determined whether the requested torque of the target generator P1 meets the combustion judgment enabling condition in the power split mode, laying a foundation for the subsequent combustion judgment of the engine.

[0126] Exemplarily, to help understand the implementation process of the engine combustion judgment method obtained by combining the above Embodiment 1, Embodiment 2, and Embodiment 3, please refer to Figure 5 , Figure 5 A brief flow schematic diagram of an engine combustion judgment method is provided. Specifically:

[0127] In the power split mode, the engine torque on the planetary gear set is transmitted to the sun gear (the position where the P1 generator is located) and the ring gear (the wheel end position where the P3 drive motor is located) through the structural relationship of the planet carrier. If the torque resultant force of the planetary gear set structure system is unbalanced, it will cause a runaway phenomenon in the planetary gear set structure system. In this embodiment, the torque resultant force on the planetary gear set in the planet carrier system is monitored to judge whether the engine torque is accurate. Based on this, combined with the torque magnitude of the P1 generator on the sun gear, it is identified and judged whether the engine is actually burning. The specific control process is as follows: 1) When the engine cannot burn, to maintain the target speed control, the requested torque M of the P1 generator P1-Req will fluctuate within a small range to control and adjust the engine speed. Therefore, the power split mode combustion judgment is enabled: in the power split mode, |M P1-Req | is less than a certain value M K1 in this case. 2) The engine torque M is calculated in the engine control systemice , which is mainly calculated based on the actual intake air volume, the actual controlled fuel injection volume under the fuel conversion air-fuel ratio calibrated on the test bench, and the actual controlled ignition angle under the corresponding working conditions. However, the system cannot monitor whether the injector or the ignition device actually injects fuel or ignites. But in the target speed control, the engine intake air volume will be adjusted to adjust the engine output torque. If there is a fault in the engine fuel injection system or ignition system, it will cause the calculated torque M of the engine ice to be quite different from the actual torque. When the engine cannot burn, the actual torque will be the engine running resistance torque; the torque exerted by the engine on the planetary gear set: M P-ice = M ice + J ice ×dn ice ×2π / 60. 3) The motor control system can monitor the authenticity of the P1 generator torque in real time, and the torque M of the P1 generator P1-Act The torque accuracy is usually stronger than the engine control torque, and the followability is very good. M P1-Act basically follows M P1-Req ; the torque exerted by the P1 generator on the planetary gear set: M P-P1 =(M P1-Act + J P1 ×dn P1 ×2π / 60)×K P1 . 4) When the vehicle is in a uniform steady state, the resultant force acting on the ring gear is almost zero. If the vehicle is in an acceleration or deceleration process, there is an inertial force acting on the planetary gear set by the ring gear. Since the ring gear is coupled with the wheel end, the vehicle acceleration torque can be used to calculate the torque acting on the planetary gear set by the ring gear; the torque exerted by the ring gear on the planetary gear set: M P-Ring = M×a×R / K Ring . 5) The resultant torque acting on the planetary gear set: M P = M P-ice + M P-P1 + M P-Ring . Usually, when the engine calculated torque is accurate, M P is close to zero or within a certain torque range. If |M P | is greater than a certain value M K2 , and lasts for a certain time T, it is determined that the engine is in an unburned state.

[0128] This embodiment can accurately judge the engine combustion in the power split mode of the hybrid vehicle, avoid the situation of post-combustion erosion and blockage of the catalyst, and improve the safety of the hybrid control system.

[0129] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the engine combustion judgment method of this application. Based on this technical concept, more forms of simple transformations are within the protection scope of this application.

[0130] The present application further provides an engine combustion judgment device. Please refer to Figure 6 , the engine combustion judgment device includes:

[0131] An acquisition module 10, configured to acquire the engine acting torque, the target generator acting torque, and the ring gear acting torque when the requested torque of the target generator meets the combustion judgment enabling condition corresponding to the power split mode;

[0132] A processing module 20, configured to determine the planetary gear set torque resultant force according to the engine acting torque, the target generator acting torque, and the ring gear acting torque;

[0133] A judgment module 30, configured to judge the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determine the combustion state of the target engine according to the state judgment result.

[0134] Optionally, the acquisition module 10 is further configured to:

[0135] Acquire the engine calculated torque, the output torque of the target generator, and the current acceleration; perform torque calculation according to the engine calculated torque to determine the engine acting torque; perform torque calculation according to the output torque to determine the target generator acting torque; perform torque calculation according to the current acceleration to determine the ring gear acting torque.

[0136] Optionally, the acquisition module 10 is further configured to:

[0137] Acquire the engine moment of inertia and the engine speed change rate of the target engine; determine the engine inertia acting force of the target engine according to the engine moment of inertia and the engine speed change rate; perform torque calculation according to the engine inertia acting force and the engine calculated torque to determine the engine acting torque.

[0138] Optionally, the acquisition module 10 is further configured to:

[0139] Acquire the generator moment of inertia of the target generator, the generator speed change rate of the target generator, and the first transmission coefficient; determine the generator inertia acting force of the target generator according to the generator moment of inertia and the generator speed change rate; perform torque calculation according to the generator inertia acting force, the first transmission coefficient, and the output torque to determine the target generator acting torque.

[0140] Optionally, the acquisition module 10 is further configured to:

[0141] Obtain the curb weight of the whole vehicle, the radius of the vehicle tire, and the second transmission coefficient; perform torque calculation based on the curb weight of the whole vehicle, the radius of the vehicle tire, the second transmission coefficient, and the current acceleration to determine the acting torque of the ring gear.

[0142] Optionally, the determination module 30 is further configured to:

[0143] Judge the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant threshold; when the state judgment result is that the absolute value of the resultant torque of the planetary gear set is greater than the torque resultant threshold, determine the state duration; when the state duration is greater than the duration threshold, determine that the combustion state of the target engine is an unburned state.

[0144] Optionally, the determination module 30 is further configured to:

[0145] When the state judgment result is that the absolute value of the resultant torque of the planetary gear set is not greater than the torque resultant threshold, determine that the combustion state of the target engine is a normal combustion state.

[0146] Optionally, the acquisition module 10 is further configured to:

[0147] Determine the current operation mode according to the vehicle mode control information; when the current operation mode is the power split mode, obtain the requested torque of the target generator; when the absolute value of the requested torque of the target generator is less than the requested torque threshold, determine that the requested torque of the target generator meets the combustion judgment enabling condition in the power split mode.

[0148] Optionally, the determination module 30 is further configured to:

[0149] When the combustion state of the target engine is an unburned state, generate a combustion warning message according to the resultant torque of the planetary gear set; send the combustion warning message to the vehicle display interface for combustion state warning.

[0150] The engine combustion judgment device provided by this application adopts the engine combustion judgment method in the above embodiment, and can solve the technical problem of engine combustion judgment. Compared with the prior art, the beneficial effects of the engine combustion judgment device provided by this application are the same as those of the engine combustion judgment method provided by the above embodiment, and other technical features in the engine combustion judgment device are the same as the features disclosed in the method of the above embodiment, and will not be elaborated here.

[0151] The present application provides an engine combustion judgment device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the engine combustion judgment method in the first embodiment above.

[0152] Refer to the following Figure 7 , which shows a schematic structural diagram of an engine combustion judgment device suitable for implementing the embodiments of the present application. The engine combustion judgment device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistant), PADs (Portable Application Description: tablet computers), PMPs (Portable Media Player: portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The shown engine combustion judgment device is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0153] As Figure 7As shown, the engine combustion determination device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM: Random Access Memory) 1004. In the RAM 1004, various programs and data required for the operation of the engine combustion determination device are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the engine combustion determination device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows an engine combustion determination device having various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems can be alternatively implemented or had.

[0154] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above functions defined in the methods of the embodiments disclosed in the present application are executed.

[0155] The engine combustion determination device provided by the present application adopts the engine combustion determination method in the above embodiments and can solve the technical problems of engine combustion determination. Compared with the prior art, the beneficial effects of the engine combustion determination device provided by the present application are the same as those of the engine combustion determination method provided by the above embodiments, and the other technical features in the engine combustion determination device are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0156] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0157] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0158] This application provides a computer-readable storage medium with computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the engine combustion judgment method in the above embodiments.

[0159] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, device, or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0160] The above computer-readable storage medium can be included in the engine combustion judgment device; it can also exist independently without being assembled into the engine combustion judgment device.

[0161] The above computer-readable storage medium carries one or more programs. When the above one or more programs are executed by the engine combustion judgment device, the engine combustion judgment device is enabled to perform engine combustion judgment.

[0162] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN: Local Area Network) or a wide area network (WAN: Wide Area Network), or it can be connected to an external computer (for example, by connecting through the Internet using an Internet service provider).

[0163] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of the code, and this module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutively represented blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0164] The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation on the unit itself in some cases.

[0165] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned engine combustion judgment method, and can solve the technical problem of engine combustion judgment. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the engine combustion judgment method provided in the above embodiments, and will not be elaborated here.

[0166] The present application also provides a computer program product, including a computer program which, when executed by a processor, implements the steps of the engine combustion determination method as described above.

[0167] The computer program product provided by the present application can solve the technical problem of engine combustion determination. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as those of the engine combustion determination method provided in the above embodiments, and will not be elaborated here.

[0168] The above are only partial embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A method for judging engine combustion, characterized in that, The engine combustion determination method includes: When the requested torque of the target generator meets the combustion determination enabling condition corresponding to the power split mode, obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque; Determine the planetary gear set torque resultant force according to the engine acting torque, the target generator acting torque, and the ring gear acting torque; Judge the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determine the combustion state of the target engine according to the state judgment result.

2. The method according to claim 1, wherein Before obtaining the engine acting torque, the target generator acting torque, and the ring gear acting torque, it further includes: Obtain the engine calculated torque, the output torque of the target generator, and the current acceleration; Perform torque calculation according to the engine calculated torque to determine the engine acting torque; Perform torque calculation according to the output torque to determine the target generator acting torque; Perform torque calculation according to the current acceleration to determine the ring gear acting torque.

3. The method according to claim 2, wherein The performing torque calculation according to the engine calculated torque to determine the engine acting torque includes: Obtain the engine moment of inertia and the engine speed change rate of the target engine; Determine the engine inertia acting force of the target engine according to the engine moment of inertia and the engine speed change rate; Perform torque calculation according to the engine inertia acting force and the engine calculated torque to determine the engine acting torque.

4. The method according to claim 2, wherein The performing torque calculation according to the output torque to determine the target generator acting torque includes: Obtain the generator moment of inertia of the target generator, the generator speed change rate of the target generator, and the first transmission coefficient; Determine the generator inertia acting force of the target generator according to the generator moment of inertia and the generator speed change rate; Perform torque calculation according to the generator inertia acting force, the first transmission coefficient, and the output torque to determine the target generator acting torque.

5. The method according to claim 2, characterized in that, The performing torque calculation according to the current acceleration to determine the ring gear acting torque includes: Obtain the curb weight of the vehicle, the vehicle tire radius, and the second transmission coefficient; Perform torque calculation according to the curb weight of the vehicle, the vehicle tire radius, the second transmission coefficient, and the current acceleration to determine the ring gear acting torque.

6. The method according to claim 1, characterized in that, The judging the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, and determining the combustion state of the target engine according to the state judgment result includes: Judge the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold; When the state judgment result is that the absolute value of the planetary gear set torque resultant force is greater than the torque resultant force threshold, determine the state duration; When the state duration is greater than the duration threshold, determine that the combustion state of the target engine is the unburned state.

7. The method according to claim 6, wherein After judging the combustion state of the target engine according to the planetary gear set torque resultant force and the torque resultant force threshold, it further includes: When the absolute value of the resultant torque of the planetary gear set is not greater than the torque resultant threshold in the state judgment result, determine that the combustion state of the target engine is the normal combustion state.

8. The method according to any one of claims 1 to 7, characterized in that Before obtaining the engine acting torque, the target generator acting torque, and the ring gear acting torque when the requested torque of the target generator satisfies the combustion judgment enabling condition corresponding to the power split mode, it further includes: Determine the current operating mode according to the vehicle mode control information; When the current operating mode is the power split mode, obtain the requested torque of the target generator; When the absolute value of the requested torque of the target generator is less than the requested torque threshold, determine that the requested torque of the target generator satisfies the combustion judgment enabling condition in the power split mode.

9. The method according to any one of claims 1 to 7, characterized in that, After judging the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant threshold, and determining the combustion state of the target engine according to the state judgment result, it further includes: When the combustion state of the target engine is the unburned state, generate a combustion warning message according to the resultant torque of the planetary gear set; Send the combustion warning message to the vehicle display interface for combustion state warning.

10. An engine combustion judgment device, characterized in that, The engine combustion judgment device includes: An acquisition module, configured to obtain the engine acting torque, the target generator acting torque, and the ring gear acting torque when the requested torque of the target generator satisfies the combustion judgment enabling condition corresponding to the power split mode; A processing module, configured to determine the resultant torque of the planetary gear set according to the engine acting torque, the target generator acting torque, and the ring gear acting torque; A judgment module, configured to judge the combustion state of the target engine according to the resultant torque of the planetary gear set and the torque resultant threshold, and determine the combustion state of the target engine according to the state judgment result.

11. An engine combustion judgment device, characterized in that, The engine combustion judgment device includes: a memory, a processor, and an engine combustion judgment program stored on the memory and executable on the processor, where the engine combustion judgment program is configured to implement the engine combustion judgment method according to any one of claims 1 to 9.

12. A storage medium, characterized in that, An engine combustion judgment program is stored on the storage medium, and when the engine combustion judgment program is executed by the processor, it implements the engine combustion judgment method according to any one of claims 1 to 9.

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