Method for determining optimal working point of engine and related device

Abstract

The embodiment of the invention relates to the field of data processing and hybrid vehicles, and provides a method for determining the optimal working point of an engine and a related device, and the method comprises the steps: obtaining a steady-state operation efficiency diagram of a generator of a to-be-detected hybrid vehicle at each working point; constructing a transient efficiency diagram of each working point when the generator of the hybrid vehicle to be detected operates; performing fusion processing on the steady-state operation efficiency diagram and the transient efficiency diagram to obtain a target efficiency diagram; determining an engine oil consumption diagram corresponding to each working point of the generator of the hybrid vehicle to be detected; determining a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map; the optimal working point of the hybrid vehicle to be detected under the corresponding working condition is determined according to the comprehensive oil consumption diagram, and the optimal working point of the hybrid vehicle under the corresponding working condition can be determined by combining the transient efficiency diagram, the steady-state operation efficiency diagram and the engine oil consumption diagram of each working point when the engine operates. And the accuracy of determining the optimal working point is improved.

Description

Technical Field

[0001] The present application relates to the fields of data processing and hybrid vehicle technology, and in particular to a method for determining an optimal operating point of an engine and a related device. Background Art

[0002] In current series hybrid systems, the engine operating point selection mechanism mainly relies on traditional empirical formulas or simplified rules. These traditional methods are often based on preset, relatively static operating condition assumptions, which results in low accuracy in determining the engine's optimal operating point. This limitation makes it difficult to continuously maintain the engine operating point in its most efficient operating range in actual operation, thereby increasing overall fuel consumption. Summary of the invention

[0003] The embodiments of the present application provide a method and a related device for determining the optimal operating point of an engine, which can determine the optimal operating point of a hybrid vehicle under corresponding working conditions by combining a transient efficiency diagram, a steady-state operating efficiency diagram, and an engine fuel consumption diagram of each operating point of the engine during operation, thereby improving the accuracy of determining the optimal operating point and reducing the fuel consumption of the hybrid vehicle.

[0004] A first aspect of an embodiment of the present application provides a method for determining an optimal operating point of an engine, the method comprising:

[0005] Obtaining a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point;

[0006] Constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation;

[0007] fusing the steady-state efficiency graph and the transient efficiency graph to obtain a target efficiency graph;

[0008] Determine an engine fuel consumption diagram corresponding to each operating point of a generator of the hybrid vehicle to be tested;

[0009] determining a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map;

[0010] The optimal operating point of the hybrid vehicle to be tested under the corresponding working condition is determined according to the comprehensive fuel consumption map.

[0011] In this example, by obtaining a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point, a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation is constructed, the steady-state operating efficiency diagram and the transient efficiency diagram are fused to obtain a target efficiency diagram, and an engine fuel consumption diagram corresponding to each operating point of the generator of the hybrid vehicle to be tested is determined. According to the target efficiency diagram and the engine fuel consumption diagram, a comprehensive fuel consumption diagram is determined, and according to the comprehensive fuel consumption diagram, the optimal operating point of the hybrid vehicle to be tested under the corresponding operating condition is determined. Therefore, the transient efficiency diagram of each operating point when the engine is running, the steady-state operating efficiency diagram and the engine fuel consumption diagram can be combined to determine the optimal operating point of the hybrid vehicle under the corresponding operating condition, thereby improving the accuracy of determining the optimal operating point, and thus reducing the fuel consumption of the hybrid vehicle.

[0012] In a possible implementation, constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation includes:

[0013] Obtaining vehicle operating parameters under k operating conditions when the generator is running, to obtain a vehicle operating parameter set;

[0014] Determine the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set, and obtain the input mechanical work set;

[0015] Determine the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set;

[0016] A transient efficiency diagram of each operating point of the generator during operation is determined according to the input mechanical work set and the power generation set.

[0017] In a possible implementation, determining the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameters in the vehicle operating parameter set to obtain the input mechanical work set includes:

[0018] The input mechanical work of the first vehicle operating parameter is determined by the method shown in the following formula, where the first vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0019]

[0020] Among them, E k is the input mechanical work, T is the input torque, n is the input speed, and t is the time;

[0021] Repeat the above method of determining the input mechanical work of the first vehicle operating parameter by the method shown in the following formula until the input mechanical work corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the input mechanical work set.

[0022] In a possible implementation, determining the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain the power generation set includes:

[0023] The input mechanical work of the second vehicle operating parameter is determined by the method shown in the following formula, where the second vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0024]

[0025] Among them, E is the power generation, U is the output voltage, I is the output current, and t is the time;

[0026] The method of determining the input mechanical work of the second vehicle operating parameter by the method shown in the following formula is repeatedly executed until the power generation corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the power generation set.

[0027] In a possible implementation, the fusing the steady-state operation efficiency map and the transient efficiency map to obtain a target efficiency map includes:

[0028] Obtaining a first weight corresponding to the steady-state efficiency diagram, and obtaining a second weight corresponding to the transient efficiency diagram;

[0029] Using the first weight and the second weight to perform weighted calculation on the efficiency values ​​of the corresponding working points in the steady-state efficiency diagram and the transient efficiency diagram, to obtain a target efficiency value of each working point;

[0030] An efficiency diagram is constructed according to the target efficiency values ​​of the various operating points to obtain the target efficiency diagram.

[0031] In a possible implementation, determining the optimal operating point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map includes:

[0032] Determine k power demand intervals;

[0033] Determine the optimal operating points corresponding to the k power demand intervals respectively from the comprehensive fuel consumption map to obtain k reference optimal operating points;

[0034] Acquire position information of k reference working points in the engine operation diagram of the hybrid vehicle to be detected to obtain k reference position information;

[0035] The optimal operating point of the engine under the corresponding operating conditions is determined according to the k reference position information.

[0036] A second aspect of an embodiment of the present application provides a device for determining an optimal operating point of an engine, the device comprising:

[0037] An acquisition unit, used to acquire a steady-state operating efficiency diagram of a generator of a hybrid vehicle to be tested at each operating point;

[0038] A construction unit, used to construct a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation;

[0039] A fusion unit, used for fusing the steady-state efficiency diagram and the transient efficiency diagram to obtain a target efficiency diagram;

[0040] A first determination unit is used to determine an engine fuel consumption map corresponding to each working point of a generator of a hybrid vehicle to be tested;

[0041] a second determining unit, configured to determine a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map;

[0042] The third determination unit is used to determine the optimal working point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map.

[0043] In a possible implementation, the construction unit is specifically used to:

[0044] Obtaining vehicle operating parameters under k operating conditions when the generator is running, to obtain a vehicle operating parameter set;

[0045] Determine the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set, and obtain the input mechanical work set;

[0046] Determine the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set;

[0047] A transient efficiency diagram of each operating point of the generator during operation is determined according to the input mechanical work set and the power generation set.

[0048] In a possible implementation, in determining the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameters in the vehicle operating parameter set to obtain the input mechanical work set, the construction unit is specifically used to:

[0049] The input mechanical work of the first vehicle operating parameter is determined by the method shown in the following formula, where the first vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0050]

[0051] Among them, E k is the input mechanical work, T is the input torque, n is the input speed, and t is the time;

[0052] Repeat the above method of determining the input mechanical work of the first vehicle operating parameter by the method shown in the following formula until the input mechanical work corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the input mechanical work set.

[0053] In a possible implementation, in determining the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain the power generation set, the construction unit is specifically used to:

[0054] The input mechanical work of the second vehicle operating parameter is determined by the method shown in the following formula, where the second vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0055]

[0056] Among them, E is the power generation, U is the output voltage, I is the output current, and t is the time;

[0057] The method of determining the input mechanical work of the second vehicle operating parameter by the method shown in the following formula is repeatedly executed until the power generation corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the power generation set.

[0058] In a possible implementation, the fusion unit is specifically used to:

[0059] Obtaining a first weight corresponding to the steady-state efficiency diagram, and obtaining a second weight corresponding to the transient efficiency diagram;

[0060] Using the first weight and the second weight to perform weighted calculation on the efficiency values ​​of the corresponding working points in the steady-state efficiency diagram and the transient efficiency diagram, to obtain a target efficiency value of each working point;

[0061] An efficiency diagram is constructed according to the target efficiency values ​​of the various operating points to obtain the target efficiency diagram.

[0062] In a possible implementation manner, the third determining unit is specifically configured to:

[0063] Determine k power demand intervals;

[0064] Determine the optimal operating points corresponding to the k power demand intervals respectively from the comprehensive fuel consumption map to obtain k reference optimal operating points;

[0065] Acquire position information of k reference working points in the engine operation diagram of the hybrid vehicle to be detected to obtain k reference position information;

[0066] The optimal operating point of the engine under the corresponding operating conditions is determined according to the k reference position information.

[0067] A third aspect of an embodiment of the present application provides a terminal, comprising a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the step instructions in the first aspect of the embodiment of the present application.

[0068] The fourth aspect of the embodiments of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps described in the first aspect of the embodiments of the present application.

[0069] A fifth aspect of the embodiments of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described in the first aspect of the embodiments of the present application. The computer program product may be a software installation package. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0071] Figure 1 A flow chart of a method for determining an optimal operating point of an engine is provided for an embodiment of the present application;

[0072] Figure 2 A schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0073] Figure 3A structural schematic diagram of a device for determining an optimal operating point of an engine is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0074] 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.

[0075] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0076] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0077] In order to better understand the method for determining the optimal operating point of an engine provided by an embodiment of the present application, the following first briefly introduces the existing method for determining the optimal operating point of an engine. In the existing scheme, the selection mechanism of the engine operating point mainly relies on traditional empirical formulas or simplified rules. These traditional methods are often based on preset, relatively static operating condition assumptions, and lack the ability to conduct detailed analysis and rapid response to the dynamic changes in the actual efficiency of the engine under different load and speed conditions. This limitation makes it difficult for the engine operating point to continue to maintain its most efficient operating range in actual operation, thereby affecting the overall fuel economy. In addition, due to the lack of flexibility and accuracy of these methods, especially when facing high loads or complex and changeable dynamic conditions, it is difficult for the system to quickly and accurately adjust the working state of the engine and cannot effectively respond to the rapid changes in actual working conditions. This lack of real-time control capability further restricts the room for improving the overall efficiency of the system.

[0078] In order to solve the above technical problems, an embodiment of the present application provides a method for determining the optimal operating point of an engine, which can combine the transient efficiency diagram, steady-state operating efficiency diagram and engine fuel consumption diagram of each operating point of the engine during operation to determine the optimal operating point of a hybrid vehicle under corresponding working conditions, thereby improving the accuracy of determining the optimal operating point and reducing the fuel consumption of the hybrid vehicle.

[0079] See also Figure 1 , Figure 1 A flow chart of a method for determining an optimal operating point of an engine is provided for an embodiment of the present application. Figure 1 As shown, the method includes:

[0080] 101. Obtain a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point.

[0081] The hybrid vehicle to be tested may be a vehicle that is already in use or a vehicle that is in the testing phase before being put into production. The hybrid vehicle to be tested includes a series hybrid system, which includes an engine and a generator. The operating point can be understood as a general operating point of a hybrid vehicle. The steady-state operating efficiency diagram can be obtained from the automobile supplier of the hybrid vehicle to be tested.

[0082] 102. Construct a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation.

[0083] The vehicle operating parameters under k operating conditions when the generator is running can be obtained, and the transient efficiency diagram can be determined according to the input speed, input torque, output current and output voltage in the vehicle operating parameters. Therefore, the transient efficiency diagram can be determined in combination with the operating parameters of the hybrid vehicle to be tested when it is running, which can improve the accuracy of determining the transient efficiency diagram.

[0084] 103. Fusing the steady-state efficiency graph and the transient efficiency graph to obtain a target efficiency graph.

[0085] The weights corresponding to the steady-state operation efficiency diagram and the transient efficiency diagram may be obtained respectively, and the steady-state operation efficiency diagram and the transient efficiency diagram may be fused using the weights to obtain a target efficiency diagram.

[0086] 104. Determine an engine fuel consumption diagram corresponding to each operating point of the generator of the hybrid vehicle to be tested.

[0087] The initial engine fuel consumption map of the hybrid vehicle to be tested is obtained. The transmission ratio and transmission efficiency between the engine and the generator are obtained, and the engine fuel consumption map corresponding to each working point of the generator is derived according to the transmission ratio and transmission efficiency. Specifically, a general derivation method can be used for derivation to obtain the engine fuel consumption map corresponding to each working point of the generator.

[0088] 105. Determine a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map.

[0089] The engine fuel consumption map and the target efficiency map can be divided point by point to obtain a comprehensive fuel consumption map. Specifically, the point by point division can be understood as dividing the fuel consumption value in the engine fuel consumption map with the efficiency value in the target efficiency map for each operating point to obtain a corresponding value, and the corresponding value is used together with the operating point to construct a comprehensive fuel consumption map. A general construction method can be used to construct a comprehensive fuel consumption map.

[0090] 106. Determine the optimal operating point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map.

[0091] Among them, multiple power demand intervals can be determined, and then the optimal operating point corresponding to the power interval can be determined from the comprehensive fuel consumption diagram to obtain a reference optimal operating point. The optimal operating point of the engine under the corresponding working conditions can be determined by referring to the position information of the optimal operating point in the engine operation diagram.

[0092] In this example, by obtaining a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point, a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation is constructed, the steady-state operating efficiency diagram and the transient efficiency diagram are fused to obtain a target efficiency diagram, and an engine fuel consumption diagram corresponding to each operating point of the generator of the hybrid vehicle to be tested is determined. According to the target efficiency diagram and the engine fuel consumption diagram, a comprehensive fuel consumption diagram is determined, and according to the comprehensive fuel consumption diagram, the optimal operating point of the hybrid vehicle to be tested under the corresponding operating condition is determined. Therefore, the transient efficiency diagram of each operating point when the engine is running, the steady-state operating efficiency diagram and the engine fuel consumption diagram can be combined to determine the optimal operating point of the hybrid vehicle under the corresponding operating condition, thereby improving the accuracy of determining the optimal operating point, and thus reducing the fuel consumption of the hybrid vehicle.

[0093] In a possible implementation, constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation includes:

[0094] A1. Obtain vehicle operating parameters under k operating conditions when the generator is running, and obtain a vehicle operating parameter set;

[0095] A2. Determine the input mechanical work under the corresponding working condition according to the input speed and input torque in the vehicle operating parameter set to obtain an input mechanical work set;

[0096] A3. Determine the power generation under the corresponding working condition according to the output current and output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set;

[0097] A4. Determine a transient efficiency diagram of each operating point of the generator during operation according to the input mechanical work set and the power generation set.

[0098] The vehicle operating parameters include input speed, input torque, output current and output voltage. The K operating conditions can be understood as k pre-set operating conditions, or can be all operating conditions of the hybrid vehicle to be tested.

[0099] The entropy of the input mechanical work and the corresponding power generation can be determined as the power generation efficiency of the corresponding working point. Therefore, the efficiency diagram is constructed according to the power generation efficiency and the corresponding working point to obtain the transient efficiency diagram. Specifically, a general efficiency diagram construction method can be used, which will not be described here.

[0100] The input mechanical work of the first vehicle operating parameter may be determined by the method shown in the following formula, where the first vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0101]

[0102] Among them, E k is the input mechanical work, T is the input torque, n is the input speed, and t is the time;

[0103] Repeat the above method of determining the input mechanical work of the first vehicle operating parameter by the method shown in the following formula until the input mechanical work corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the input mechanical work set.

[0104] The input mechanical work of the second vehicle operating parameter may be determined by the method shown in the following formula, where the second vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0105]

[0106] Among them, E is the power generation, U is the output voltage, I is the output current, and t is the time;

[0107] The method of determining the input mechanical work of the second vehicle operating parameter by the method shown in the following formula is repeatedly executed until the power generation corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the power generation set.

[0108] In a possible implementation, the fusing the steady-state operation efficiency map and the transient efficiency map to obtain a target efficiency map includes:

[0109] B1. Obtaining a first weight corresponding to the steady-state efficiency diagram, and obtaining a second weight corresponding to the transient efficiency diagram;

[0110] B2. Using the first weight and the second weight to perform weight calculation on the efficiency values ​​of the corresponding working points in the steady-state efficiency diagram and the transient efficiency diagram to obtain a target efficiency value of each working point;

[0111] B3. Constructing an efficiency diagram according to the target efficiency values ​​of each operating point to obtain the target efficiency diagram.

[0112] The first weight and the second weight may be pre-set weights, which may be set by empirical values ​​or historical data. A general construction method may be used to construct an efficiency diagram according to the target efficiency values ​​of each operating point to obtain the target efficiency diagram.

[0113] In a possible implementation, determining the optimal operating point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map includes:

[0114] C1. Determine k power demand intervals;

[0115] C2. Determine the optimal operating points corresponding to the k power demand intervals respectively from the comprehensive fuel consumption map to obtain k reference optimal operating points;

[0116] C3. Obtaining position information of k reference working points in the engine operation diagram of the hybrid vehicle to be tested, to obtain k reference position information;

[0117] C4. Determine the optimal operating point of the engine under the corresponding working condition according to the k reference position information.

[0118] The power demand range may be understood as a power demand range set for different operating conditions during operation.

[0119] The operating point with the lowest fuel consumption in the power demand range can be determined by traversing and combining with the comprehensive fuel consumption map, and determined as the reference optimal operating point.

[0120] The position information of k reference operating points in the engine operation diagram of the hybrid vehicle to be tested can be obtained by a general reverse deduction method to obtain k reference position information, and the operating point corresponding to the reference position information is determined as the optimal operating point under the corresponding working condition.

[0121] For the above embodiments, please refer to Figure 2 , Figure 2A schematic diagram of the structure of a terminal provided in an embodiment of the present application, as shown in the figure, includes a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and the program includes instructions for executing the following steps;

[0122] Obtaining a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point;

[0123] Constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation;

[0124] fusing the steady-state efficiency graph and the transient efficiency graph to obtain a target efficiency graph;

[0125] Determine an engine fuel consumption diagram corresponding to each operating point of a generator of the hybrid vehicle to be tested;

[0126] determining a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map;

[0127] The optimal operating point of the hybrid vehicle to be tested under the corresponding working condition is determined according to the comprehensive fuel consumption map.

[0128] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the execution process on the method side. It is understandable that in order to realize the above functions, the terminal includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments provided herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can 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.

[0129] The embodiment of the present application can divide the terminal into functional units according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0130] In line with the above, see Figure 3 , Figure 3The present invention provides a schematic diagram of a device for determining an optimal operating point of an engine. Figure 3 As shown, the device comprises:

[0131] An acquisition unit 301 is used to acquire a steady-state operating efficiency diagram of a generator of a hybrid vehicle to be tested at each operating point;

[0132] A construction unit 302 is used to construct a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation;

[0133] A fusion unit 303 is used to fuse the steady-state efficiency map and the transient efficiency map to obtain a target efficiency map;

[0134] A first determination unit 304 is used to determine an engine fuel consumption diagram corresponding to each working point of the generator of the hybrid vehicle to be tested;

[0135] A second determining unit 305 is used to determine a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map;

[0136] The third determination unit 306 is used to determine the optimal working point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map.

[0137] In a possible implementation, the construction unit 302 is specifically used for:

[0138] Obtaining vehicle operating parameters under k operating conditions when the generator is running, to obtain a vehicle operating parameter set;

[0139] Determine the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set, and obtain the input mechanical work set;

[0140] Determine the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set;

[0141] A transient efficiency diagram of each operating point of the generator during operation is determined according to the input mechanical work set and the power generation set.

[0142] In a possible implementation, in determining the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set to obtain the input mechanical work set, the construction unit 302 is specifically used for:

[0143] The input mechanical work of the first vehicle operating parameter is determined by the method shown in the following formula, where the first vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0144]

[0145] Among them, E k is the input mechanical work, T is the input torque, n is the input speed, and t is the time;

[0146] Repeat the above method of determining the input mechanical work of the first vehicle operating parameter by the method shown in the following formula until the input mechanical work corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the input mechanical work set.

[0147] In a possible implementation, in determining the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain the power generation set, the construction unit 302 is specifically used for:

[0148] The input mechanical work of the second vehicle operating parameter is determined by the method shown in the following formula, where the second vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set:

[0149]

[0150] Among them, E is the power generation, U is the output voltage, I is the output current, and t is the time;

[0151] The method of determining the input mechanical work of the second vehicle operating parameter by the method shown in the following formula is repeatedly executed until the power generation corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the power generation set.

[0152] In a possible implementation, the fusion unit 303 is specifically configured to:

[0153] Obtaining a first weight corresponding to the steady-state efficiency diagram, and obtaining a second weight corresponding to the transient efficiency diagram;

[0154] Using the first weight and the second weight to perform weighted calculation on the efficiency values ​​of the corresponding working points in the steady-state efficiency diagram and the transient efficiency diagram, to obtain a target efficiency value of each working point;

[0155] An efficiency diagram is constructed according to the target efficiency values ​​of the various operating points to obtain the target efficiency diagram.

[0156] In a possible implementation, the third determining unit 306 is specifically configured to:

[0157] Determine k power demand intervals;

[0158] Determine the optimal operating points corresponding to the k power demand intervals respectively from the comprehensive fuel consumption map to obtain k reference optimal operating points;

[0159] Acquire position information of k reference working points in the engine operation diagram of the hybrid vehicle to be detected to obtain k reference position information;

[0160] The optimal operating point of the engine under the corresponding operating conditions is determined according to the k reference position information.

[0161] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the methods for determining the optimal operating point of an engine as recorded in the above method embodiments.

[0162] An embodiment of the present application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program enables a computer to execute part or all of the steps of any one of the methods for determining the optimal operating point of an engine as recorded in the above method embodiments.

[0163] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain 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.

[0164] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0165] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical or other forms.

[0166] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0167] In addition, the functional units in the various embodiments of the application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software program modules.

[0168] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0169] A person skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which can include: a flash drive, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.

[0170] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for determining an optimal operating point of an engine, characterized in that: The method comprises: Obtaining a steady-state operating efficiency diagram of the generator of the hybrid vehicle to be tested at each operating point; Constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation; fusing the steady-state efficiency graph and the transient efficiency graph to obtain a target efficiency graph; Determine an engine fuel consumption diagram corresponding to each operating point of a generator of the hybrid vehicle to be tested; determining a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map; The optimal operating point of the hybrid vehicle to be tested under the corresponding working condition is determined according to the comprehensive fuel consumption map.

2. The method for determining the optimal operating point of an engine according to claim 1, characterized in that: The step of constructing a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation includes: Obtaining vehicle operating parameters under k operating conditions when the generator is running, to obtain a vehicle operating parameter set; Determine the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set, and obtain the input mechanical work set; Determine the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set; A transient efficiency diagram of each operating point of the generator during operation is determined according to the input mechanical work set and the power generation set.

3. The method for determining the optimal operating point of an engine according to claim 2, characterized in that: The step of determining the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameters in the vehicle operating parameter set to obtain the input mechanical work set includes: The input mechanical work of the first vehicle operating parameter is determined by the method shown in the following formula, where the first vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set: Among them, E k is the input mechanical work, T is the input torque, n is the input speed, and t is the time; Repeat the above method of determining the input mechanical work of the first vehicle operating parameter by the method shown in the following formula until the input mechanical work corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the input mechanical work set.

4. The method for determining the optimal operating point of an engine according to claim 2, characterized in that: The step of determining the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain the power generation set includes: The input mechanical work of the second vehicle operating parameter is determined by the method shown in the following formula, where the second vehicle operating parameter is any vehicle operating parameter in the vehicle operating parameter set: Among them, E is the power generation, U is the output voltage, I is the output current, and t is the time; The method of determining the input mechanical work of the second vehicle operating parameter by the method shown in the following formula is repeatedly executed until the power generation corresponding to each vehicle operating parameter in the vehicle operating parameter set is obtained to obtain the power generation set.

5. The method for determining the optimal operating point of an engine according to any one of claims 1 to 4, characterized in that: The step of fusing the steady-state efficiency graph and the transient efficiency graph to obtain a target efficiency graph includes: Obtaining a first weight corresponding to the steady-state efficiency diagram, and obtaining a second weight corresponding to the transient efficiency diagram; Using the first weight and the second weight to perform weighted calculation on the efficiency values ​​of the corresponding working points in the steady-state efficiency diagram and the transient efficiency diagram, to obtain a target efficiency value of each working point; An efficiency diagram is constructed according to the target efficiency values ​​of the various operating points to obtain the target efficiency diagram.

6. The method for determining the optimal operating point of an engine according to claim 5, characterized in that: The step of determining the optimal operating point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map includes: Determine k power demand intervals; Determine the optimal operating points corresponding to the k power demand intervals respectively from the comprehensive fuel consumption map to obtain k reference optimal operating points; Acquire position information of k reference working points in the engine operation diagram of the hybrid vehicle to be detected to obtain k reference position information; The optimal operating point of the engine under the corresponding operating conditions is determined according to the k reference position information.

7. A device for determining an optimal operating point of an engine, characterized in that: The device comprises: An acquisition unit, used to acquire a steady-state operating efficiency diagram of a generator of a hybrid vehicle to be tested at each operating point; A construction unit, used to construct a transient efficiency diagram of each operating point of the generator of the hybrid vehicle to be tested during operation; A fusion unit, used for fusing the steady-state efficiency diagram and the transient efficiency diagram to obtain a target efficiency diagram; A first determination unit is used to determine an engine fuel consumption map corresponding to each working point of a generator of a hybrid vehicle to be tested; a second determining unit, configured to determine a comprehensive fuel consumption map according to the target efficiency map and the engine fuel consumption map; The third determination unit is used to determine the optimal working point of the hybrid vehicle to be tested under the corresponding working condition according to the comprehensive fuel consumption map.

8. The engine optimal operating point determination device according to claim 7, characterized in that: The building blocks are specifically used for: Obtaining vehicle operating parameters under k operating conditions when the generator is running, to obtain a vehicle operating parameter set; Determine the input mechanical work under the corresponding working condition according to the input speed and the input torque in the vehicle operating parameter set, and obtain the input mechanical work set; Determine the power generation under the corresponding working condition according to the output current and the output voltage in the vehicle operating parameters in the vehicle operating parameter set to obtain a power generation set; A transient efficiency diagram of each operating point of the generator during operation is determined according to the input mechanical work set and the power generation set.

9. A terminal, characterized in that: The method comprises a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute the method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the processor is caused to perform the method according to any one of claims 1 to 6.

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