Engine control method, device and equipment based on EGR state and vehicle

Abstract

The invention relates to the technical field of engine control, in particular to an engine control method, device and equipment based on an EGR state and a vehicle. The method comprises the steps that the required power and the current working state of the EGR system are obtained; searching an optimal oil consumption area corresponding to the required power and a rotating speed range pointed by the optimal oil consumption area in a pre-drawn universal characteristic curve graph related to the current working state; and the rotating speed of the engine is controlled within the rotating speed range. By means of the method, fuel consumption can be prevented from being increased when the EGR system is started, and the fuel economy of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to an engine control method, device, equipment and vehicle based on EGR status. Background Art

[0002] The Exhaust Gas Recirculation (EGR) system is a technology used to reduce the emission of harmful gases (such as nitrogen oxides) in automobile exhaust. The EGR system reintroduces a portion of the exhaust gas into the intake manifold, which is mixed with fresh air before entering the combustion chamber, thereby reducing the combustion temperature and reducing the generation of nitrogen oxides.

[0003] However, when the EGR system introduces exhaust gas into the combustion chamber, excessive exhaust gas will cause the oxygen concentration in the intake manifold to become too low, resulting in incomplete combustion, which in turn requires more fuel to maintain the same power output, causing increased fuel consumption; and the introduction of exhaust gas also increases the resistance of the intake system, which means that the engine needs more energy to push the gas into the intake manifold, which also leads to increased fuel consumption.

[0004] Therefore, when the EGR system is turned on, the engine's fuel consumption will increase and the vehicle's economy will be reduced. Summary of the invention

[0005] Based on this, it is necessary to provide an engine control method, device, equipment and vehicle based on the EGR state to address the above technical problems, so as to avoid increased fuel consumption when the EGR system is turned on and improve the fuel economy of the entire vehicle.

[0006] In a first aspect, a method for controlling an engine based on an EGR state is provided, the method comprising:

[0007] Obtain the required power and the current working status of the EGR system;

[0008] In a pre-drawn universal characteristic curve diagram related to the current working state, searching for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area;

[0009] The engine speed is controlled within the speed range.

[0010] In combination with the first aspect, in a first possible implementation of the first aspect, after obtaining the current working state of the EGR system, obtaining a pre-drawn universal characteristic curve diagram related to the current working state;

[0011] Obtaining a pre-drawn universal characteristic curve diagram related to the current working state, including:

[0012] When the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state;

[0013] When the current working state of the EGR system is the on state, a pre-drawn universal characteristic curve diagram related to the on state is obtained.

[0014] In combination with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, when the current working state of the EGR system is the on state, obtaining a preset universal characteristic curve diagram related to the on state of the EGR system includes:

[0015] When the current working state of the EGR system is an open state, obtaining a current EGR valve opening of the EGR system;

[0016] A pre-drawn universal characteristic curve diagram related to the current EGR valve opening is obtained.

[0017] In combination with the first aspect, in a third possible implementation manner of the first aspect, before obtaining a pre-drawn universal characteristic curve diagram related to the current working state, the method further includes:

[0018] Draw a universal characteristic curve diagram of the engine when the EGR system is in a closed state and an open state respectively.

[0019] In combination with the second possible implementation of the first aspect, in a fourth possible implementation of the first aspect, before obtaining a pre-drawn universal characteristic curve diagram related to the current working state, the method further includes:

[0020] A universal characteristic curve diagram of the engine when the EGR system is in a closed state is drawn, and a universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is respectively a plurality of different opening values.

[0021] In combination with the third or fourth feasible implementation manner of the first aspect, in a fifth feasible implementation manner of the first aspect, in the universal characteristic curve diagram, equal fuel consumption curves and equal power curves of the engine at different speeds and torques are drawn.

[0022] In combination with the fifth implementable embodiment of the first aspect, in a sixth implementable embodiment of the first aspect, searching for an optimal fuel consumption area corresponding to the required power in a pre-drawn universal characteristic curve diagram related to the current working state includes:

[0023] In a preset universal characteristic curve diagram related to the current working state, an isopower curve pointed to by the required power is used as a target isopower curve, and an isofuel consumption curve intersecting with the target power curve is used as a target isofuel consumption curve;

[0024] In the intersection area of ​​the target constant power curve and the target constant fuel consumption curve, the area with the lowest fuel consumption is taken as the optimal fuel consumption area.

[0025] In a second aspect, an engine control device based on an EGR state is provided, the device comprising:

[0026] An acquisition module, used to acquire the required power and the current working state of the EGR system;

[0027] A search module, used to search for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area in a pre-drawn universal characteristic curve diagram related to the current working state;

[0028] The speed control module is used to control the speed of the engine within the speed range.

[0029] In a third aspect, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of an engine control method based on an EGR state as described in any one of the first aspect or the first to sixth possible implementations of the first aspect are implemented.

[0030] In a fourth aspect, a vehicle is provided, comprising an engine control device based on the EGR state as described in the second aspect.

[0031] The above-mentioned engine control method, device, equipment and vehicle based on the EGR state obtains the required power and the current working state of the EGR system, and searches for the optimal fuel consumption area corresponding to the required power and the speed range pointed to by the optimal fuel consumption area in a pre-drawn universal characteristic curve diagram related to the current working state, controls the engine speed within the speed range, and realizes that the engine is controlled to operate in the optimal working area when the EGR system is turned on, thereby avoiding increased fuel consumption and improving the fuel economy of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic flow chart of an engine control method based on an EGR state in one embodiment;

[0033] Figure 2 is a structural block diagram of an engine control device based on an EGR state in one embodiment;

[0034] Figure 3 is a structural block diagram of an engine control device based on an EGR state in one embodiment;

[0035] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0038] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0039] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] At present, in order to reduce the emission of nitrogen oxides in response to the call for environmental protection, in addition to pure electric vehicles (Battery Electric Vehicle, BEV), plug-in hybrid electric vehicles (Plug-in Hybrid Electric Vehicle, PHEV), range-extended electric vehicles (Range-Extended Electric Vehicle, REEV) and hybrid electric vehicles (HEV) and other new energy vehicles equipped with engines or internal combustion engines and non-new energy vehicles are generally equipped with Exhaust Gas Recirculation (EGR) systems.

[0041] When the EGR system introduces exhaust gas into the combustion chamber, excessive exhaust gas will make the oxygen concentration in the intake manifold too low, resulting in incomplete combustion, which in turn requires more fuel to maintain the same power output. In addition, the introduction of exhaust gas also increases the resistance of the intake system, which means that the engine needs more energy to push the gas into the intake manifold. Therefore, turning on the EGR system will increase fuel consumption and reduce the fuel economy of the entire vehicle.

[0042] To this end, the present application proposes an engine control method based on the EGR state. By obtaining the required power and the current working state of the EGR system, the optimal fuel consumption area corresponding to the required power and the speed range pointed to by the optimal fuel consumption area are found in a pre-drawn universal characteristic curve diagram related to the current working state, and the engine speed is controlled within this speed range, so that the engine is controlled to operate in the optimal working area when the EGR system is turned on, thereby avoiding increased fuel consumption and improving the fuel economy of the entire vehicle.

[0043] In one embodiment, Figure 1 As shown, an engine control method based on EGR state is provided, and the method is applied to an engine controller as an example for explanation, and includes the following steps:

[0044] Step 202, obtaining the required power and the current working state of the EGR system;

[0045] Step 204, searching for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area in a pre-drawn universal characteristic curve diagram related to the current working state;

[0046] Step 206, controlling the engine speed within the speed range.

[0047] Before executing this method, it is necessary to draw the universal characteristic curve of the engine in advance. In the first embodiment, the EGR system has only two states: closed and open. Therefore, drawing the universal characteristic curve of the engine includes: drawing the universal characteristic curve of the engine when the EGR system is in the closed state and the open state respectively; in the universal characteristic curve, the equal fuel consumption curve and the equal power curve of the engine at different speeds and torques are drawn.

[0048] When the EGR system is in the on state, the EGR rate will vary due to different operating conditions. For example, the engine controller may adjust the opening of the EGR valve based on real-time data provided by various sensors (such as the throttle position sensor, oxygen sensor, and intake pressure sensor, etc.), thereby changing the EGR rate. For example, under high load, the engine controller may increase the opening of the EGR valve to increase the EGR rate, thereby reducing nitrogen oxide emissions. Under low load or idle conditions, the engine controller may reduce the opening of the EGR valve or even shut down the EGR system to maintain stable combustion and prevent excessive exhaust gas from affecting engine performance.

[0049] Different EGR rates have different effects on fuel consumption. For different EGR rates, the engine's optimal operating area is also different. Therefore, the EGR system includes two modes: closed and open. In the open mode, different EGR valve openings are distinguished.

[0050] Therefore, preferably, in the second embodiment, drawing the universal characteristic curve diagram of the engine includes: drawing the universal characteristic curve diagram of the engine when the EGR system is in a closed state, and drawing the universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is a plurality of different opening values; in the universal characteristic curve diagram, the equal fuel consumption curve and the equal power curve of the engine at different speeds and torques are drawn.

[0051] Example of a universal characteristic curve Figure 1Generally, the following steps are included: (1) Collecting test data: Obtaining test data of the engine under different speed and load conditions, including speed, torque, power and fuel consumption rate; (2) Determining coordinate axes: The horizontal axis represents the engine speed, and the vertical axis represents the engine torque or engine power; (3) Drawing equal fuel consumption rate curves: Based on the collected data, screen out data with equal fuel consumption rates under different speeds and torques, draw equal fuel consumption curves on the coordinate axis based on these data, and mark the corresponding fuel consumption rate value on each equal fuel consumption rate curve. The closer the equal fuel consumption rate is to the center, the lower the fuel consumption rate is; (4) Drawing equal power curves: Based on the collected data, screen out data with equal power under different speeds and torques, draw equal power curves on the coordinate axis based on these data, and mark the corresponding power value on each equal power curve. It should be noted that in order to distinguish the equal fuel consumption rate curve from the equal power curve, in the universal characteristic curve diagram, the equal fuel consumption curve and the equal power curve are drawn with different line types and / or colors.

[0052] In a first embodiment, the EGR system is set to a closed state and an open state respectively, and a universal characteristic curve diagram is drawn according to the above steps to obtain universal characteristic curve diagrams related to the closed state and the open state of the EGR system respectively.

[0053] In a second embodiment, the EGR system is set to a closed state and an open state respectively, and a plurality of different EGR valve openings are set in the open state. Then, a universal characteristic curve diagram is drawn according to the above steps to obtain a universal characteristic curve diagram related to the closed state of the EGR system and a universal characteristic curve diagram related to each different EGR valve opening in the open state of the EGR system.

[0054] After drawing the universal characteristic curve diagram of the engine when the EGR system is in the closed state and the open state respectively, when using it, first obtain the required power and the current working state of the EGR system.

[0055] The required power is the power that the engine needs to output to meet the vehicle's operating requirements under specific working conditions. For example, for non-new energy vehicles, the engine is the power source of the vehicle, and the required power can be calculated based on the gear set by the driver and the depth of the accelerator pedal; for extended-range vehicles, the engine does not directly provide a power source for the vehicle, but converts the chemical energy of the fuel into mechanical energy, and then the generator converts the mechanical energy into electrical energy, thereby providing a power source for the vehicle. Therefore, after the range extender enters the power generation mode, the vehicle controller will calculate the required power generation, which is the required power generation of the engine.

[0056] In the first embodiment, the current working state of the EGR system is a closed state or an open state. Preferably, in the second embodiment, in order to adaptively control the working point of the engine at different EGR rates, the current working state of the EGR system is a closed state or an open state, and the current EGR valve opening in the open state.

[0057] After obtaining the current working state of the EGR system, a pre-drawn universal characteristic curve diagram related to the current working state is obtained. In the first embodiment, this step specifically includes: when the current working state of the EGR system is the closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state; when the current working state of the EGR system is the open state, obtaining a pre-drawn universal characteristic curve diagram related to the open state.

[0058] Preferably, in the second embodiment, the step specifically includes: when the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state; when the current working state of the EGR system is an open state, obtaining the current EGR valve opening of the EGR system; obtaining a pre-drawn universal characteristic curve diagram related to the current EGR valve opening.

[0059] Then, in a pre-drawn universal characteristic curve diagram related to the current working state, an optimal fuel consumption area corresponding to the required power is searched, specifically including: in the preset universal characteristic curve diagram related to the current working state, an isopower curve pointed to by the required power is used as a target isopower curve, and an isofuel consumption curve intersecting with the target power curve is used as a target isofuel consumption curve; in the intersection area of ​​the target isopower curve and the target isofuel consumption curve, an area with the lowest fuel consumption is used as the optimal fuel consumption area.

[0060] Finally, in the pre-drawn universal characteristic curve diagram related to the current work, find the speed range corresponding to the optimal fuel consumption area, control the engine speed within the speed range, and thus control the engine to operate in the optimal working area.

[0061] In another embodiment, the working area with the lowest fuel consumption rate can be marked on the universal characteristic curve diagram and used as the optimal working area of ​​the engine. Generally, the optimal working area is located on the innermost curves of the equal fuel consumption curve; the equal power curve intersecting with the optimal working area and the speed range corresponding to the optimal working area are determined. When applied, when the required power meets the power value corresponding to the equal power curve intersecting with the optimal working area, the engine speed is controlled within the speed range corresponding to the optimal working area.

[0062] In the above-mentioned engine control method based on EGR state, by pre-drawing the universal characteristic curve diagram of the engine related to different states of the EGR system, when in use, in the universal characteristic curve diagram of the engine related to the current working state of the EGR system, the optimal fuel consumption area corresponding to the required power and the speed range pointed to by the optimal fuel consumption area are found, and the engine speed is controlled within the speed range, so that the engine is controlled to operate in the optimal working area when the EGR system is turned on, thereby avoiding increased fuel consumption and improving the fuel economy of the whole vehicle.

[0063] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0064] In one embodiment, Figure 2 As shown, an engine control device based on EGR state is provided, comprising: an acquisition module, a search module and a speed control module, wherein:

[0065] An acquisition module, used to acquire the required power and the current working state of the EGR system;

[0066] A search module, used to search for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area in a pre-drawn universal characteristic curve diagram related to the current working state;

[0067] The speed control module is used to control the speed of the engine within the speed range.

[0068] In a specific embodiment, after acquiring the current working state of the EGR system, the acquisition module is also used to obtain a pre-drawn universal characteristic curve diagram related to the current working state, specifically including: when the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state; when the current working state of the EGR system is an open state, obtaining a pre-drawn universal characteristic curve diagram related to the open state.

[0069] In a specific embodiment, the acquisition module is used to obtain a preset universal characteristic curve diagram related to the opening state of the EGR system when the current working state of the EGR system is the opening state, specifically including: when the current working state of the EGR system is the opening state, obtaining the current EGR valve opening of the EGR system; obtaining a pre-drawn universal characteristic curve diagram related to the current EGR valve opening.

[0070] In a specific embodiment, Figure 3 As shown, the device also includes a drawing module, which is used to draw the universal characteristic curve diagram of the engine when the EGR system is in the closed state and the open state respectively before obtaining the pre-drawn universal characteristic curve diagram related to the current working state.

[0071] In a specific embodiment, the drawing module is also used to: draw a universal characteristic curve diagram of the engine when the EGR system is in a closed state, and draw a universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is a plurality of different opening values.

[0072] In a specific implementation manner, in the universal characteristic curve diagram, equal fuel consumption curves and equal power curves of the engine at different speeds and torques are plotted.

[0073] In a specific implementation, the search module is used to search for an optimal fuel consumption area corresponding to the required power in a pre-drawn universal characteristic curve diagram related to the current working state, specifically including: in the preset universal characteristic curve diagram related to the current working state, taking the equal power curve pointed to by the required power as the target equal power curve, and taking the equal fuel consumption curve intersecting with the target power curve as the target equal fuel consumption curve; in the intersection area of ​​the target equal power curve and the target equal fuel consumption curve, taking the area with the lowest fuel consumption as the optimal fuel consumption area.

[0074] For the specific definition of the engine control device based on the EGR state, please refer to the definition of the engine control method based on the EGR state in the above text, which will not be repeated here. Each module in the above-mentioned engine control device based on the EGR state can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0075] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store a universal characteristic curve diagram of the engine related to the working state of the EGR system. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an engine control method based on the EGR state is implemented.

[0076] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0077] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0078] Obtain the required power and the current working status of the EGR system;

[0079] In a pre-drawn universal characteristic curve diagram related to the current working state, searching for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area;

[0080] The engine speed is controlled within the speed range.

[0081] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0082] Obtaining a pre-drawn universal characteristic curve diagram related to the current working state, including:

[0083] When the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state;

[0084] When the current working state of the EGR system is the on state, a pre-drawn universal characteristic curve diagram related to the on state is obtained.

[0085] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0086] When the current working state of the EGR system is an open state, obtaining a current EGR valve opening of the EGR system;

[0087] A pre-drawn universal characteristic curve diagram related to the current EGR valve opening is obtained.

[0088] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0089] Draw a universal characteristic curve diagram of the engine when the EGR system is in a closed state and an open state respectively.

[0090] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0091] A universal characteristic curve diagram of the engine when the EGR system is in a closed state is drawn, and a universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is respectively a plurality of different opening values.

[0092] In one embodiment, when the processor executes the computer program, it also implements:

[0093] In the universal characteristic curve diagram, equal fuel consumption curves and equal power curves of the engine at different speeds and torques are drawn.

[0094] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0095] In a preset universal characteristic curve diagram related to the current working state, an isopower curve pointed to by the required power is used as a target isopower curve, and an isofuel consumption curve intersecting with the target power curve is used as a target isofuel consumption curve;

[0096] In the intersection area of ​​the target constant power curve and the target constant fuel consumption curve, the area with the lowest fuel consumption is taken as the optimal fuel consumption area.

[0097] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0098] Obtain the required power and the current working status of the EGR system;

[0099] In a pre-drawn universal characteristic curve diagram related to the current working state, searching for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area;

[0100] The engine speed is controlled within the speed range.

[0101] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0102] Obtaining a pre-drawn universal characteristic curve diagram related to the current working state, including:

[0103] When the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state;

[0104] When the current working state of the EGR system is the on state, a pre-drawn universal characteristic curve diagram related to the on state is obtained.

[0105] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0106] When the current working state of the EGR system is an open state, obtaining a current EGR valve opening of the EGR system;

[0107] A pre-drawn universal characteristic curve diagram related to the current EGR valve opening is obtained.

[0108] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0109] Draw a universal characteristic curve diagram of the engine when the EGR system is in a closed state and an open state respectively.

[0110] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0111] A universal characteristic curve diagram of the engine when the EGR system is in a closed state is drawn, and a universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is respectively a plurality of different opening values.

[0112] In one embodiment, when the computer program is executed by a processor, it also implements:

[0113] In the universal characteristic curve diagram, equal fuel consumption curves and equal power curves of the engine at different speeds and torques are drawn.

[0114] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0115] In a preset universal characteristic curve diagram related to the current working state, an isopower curve pointed to by the required power is used as a target isopower curve, and an isofuel consumption curve intersecting with the target power curve is used as a target isofuel consumption curve;

[0116] In the intersection area of ​​the target constant power curve and the target constant fuel consumption curve, the area with the lowest fuel consumption is taken as the optimal fuel consumption area.

[0117] In one embodiment, a vehicle is provided. The vehicle includes the engine control device based on the EGR state as described in the above embodiments.

[0118] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0119] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An engine control method based on EGR state, characterized in that: The method comprises: Obtain the required power and the current working status of the EGR system; In a pre-drawn universal characteristic curve diagram related to the current working state, searching for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area; The engine speed is controlled within the speed range.

2. The engine control method based on the EGR state according to claim 1, characterized in that: After obtaining the current working state of the EGR system, obtaining a pre-drawn universal characteristic curve diagram related to the current working state; Obtaining a pre-drawn universal characteristic curve diagram related to the current working state, including: When the current working state of the EGR system is a closed state, obtaining a pre-drawn universal characteristic curve diagram related to the closed state; When the current working state of the EGR system is the on state, a pre-drawn universal characteristic curve diagram related to the on state is obtained.

3. The engine control method based on the EGR state according to claim 2, characterized in that: When the current working state of the EGR system is the on state, obtaining a preset universal characteristic curve diagram related to the on state of the EGR system includes: When the current working state of the EGR system is an open state, obtaining a current EGR valve opening of the EGR system; A pre-drawn universal characteristic curve diagram related to the current EGR valve opening is obtained.

4. The engine control method based on the EGR state according to claim 2, characterized in that: Before obtaining a pre-drawn universal characteristic curve diagram related to the current working state, the method further includes: Draw a universal characteristic curve diagram of the engine when the EGR system is in a closed state and an open state respectively.

5. The engine control method based on the EGR state according to claim 3, characterized in that: Before obtaining a pre-drawn universal characteristic curve diagram related to the current working state, the method further includes: A universal characteristic curve diagram of the engine when the EGR system is in a closed state is drawn, and a universal characteristic curve diagram of the engine when the EGR system is in an open state and the EGR valve opening is respectively a plurality of different opening values.

6. The engine control method based on the EGR state according to claim 4 or 5, characterized in that: In the universal characteristic curve diagram, equal fuel consumption curves and equal power curves of the engine at different speeds and torques are drawn.

7. The engine control method based on the EGR state according to claim 6, characterized in that: In a pre-drawn universal characteristic curve diagram related to the current working state, searching for an optimal fuel consumption area corresponding to the required power includes: In a preset universal characteristic curve diagram related to the current working state, an isopower curve pointed to by the required power is used as a target isopower curve, and an isofuel consumption curve intersecting with the target power curve is used as a target isofuel consumption curve; In the intersection area of ​​the target constant power curve and the target constant fuel consumption curve, the area with the lowest fuel consumption is taken as the optimal fuel consumption area.

8. An engine control device based on EGR state, characterized in that: The device comprises: An acquisition module, used to acquire the required power and the current working state of the EGR system; A search module, used to search for an optimal fuel consumption area corresponding to the required power and a speed range pointed to by the optimal fuel consumption area in a pre-drawn universal characteristic curve diagram related to the current working state; The speed control module is used to control the speed of the engine within the speed range.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the engine control method based on the EGR state according to any one of claims 1 to 7 are implemented.

10. A vehicle, characterized in that: The vehicle includes the EGR state-based engine control apparatus of claim 8 .

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