Starting control method and system of hybrid vehicle, vehicle and equipment

Abstract

The invention discloses a starting control method and system of a hybrid vehicle, the vehicle and equipment. The starting control method of the hybrid vehicle comprises the steps that whether the low-rotating-speed starting condition of an engine is met or not is judged; if the low-rotating-speed starting condition of the engine is met, a low-rotating-speed starting request is sent to a hybrid power system controller, so that the hybrid power system controller controls an ISG to drag the engine to maintain low-rotating-speed operation; according to the engine oil pressure of the engine or the compression top dead center position of the first cylinder of the engine, the oil injection ignition time of the engine is determined; and when the oil injection ignition time is reached, the engine is controlled to execute the corresponding oil injection ignition action so as to start the engine. By the adoption of the method and device, when the low-rotating-speed starting condition is met, the ISG is controlled to drag the engine to operate at the low rotating speed, the oil injection ignition time is determined, accurate control over starting of the engine is achieved, and therefore the durability and starting reliability of the hybrid vehicle engine are guaranteed.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a starting control method, system, vehicle, and equipment for a hybrid vehicle. Background Technology

[0002] During vehicle engine starting, if high-speed starting is used in low-temperature environments or when the engine malfunctions, it may reduce engine lifespan or even cause direct damage, or prevent the engine from starting altogether. Existing starter control technologies employ two main approaches: one relies solely on engine coolant or oil temperature to control the integrated starter generator (ISG) to drive the engine at low speeds. However, this approach neglects engine oil pressure, ISG torque control, and fuel injection control, resulting in poor control performance. Another approach relies on additional equipment to preheat the engine oil before starting to improve lubrication. However, this requires moving the vehicle to the preheating equipment location, making it less practical and less suitable for starter control requirements. Summary of the Invention

[0003] Therefore, it is necessary to provide a starting control method, system, vehicle, and equipment for hybrid vehicles to address the aforementioned technical problems. When the low-speed starting conditions are met, the ISG is controlled to drive the engine to run at low speed and the timing of fuel injection ignition is determined to achieve precise control of engine starting, thereby ensuring the durability and starting reliability of the hybrid vehicle engine.

[0004] Firstly, a method for starting control of a hybrid vehicle is provided, including: Determine whether the conditions for starting the engine at low speed are met; If the engine low-speed start-up conditions are met, a low-speed start-up request is sent to the hybrid system controller, which then controls the ISG to drag the engine to maintain low-speed operation. The timing of fuel injection and ignition is determined based on the engine oil pressure or the top dead center position of the first cylinder of the engine. When the fuel injection ignition timing is reached, the engine is controlled to perform the corresponding fuel injection ignition action to start the engine.

[0005] Furthermore, the determination of whether the engine low-speed start-up condition is met includes: Determine if the intake camshaft of the engine is faulty; If the intake camshaft of the engine is not faulty, then the engine low-speed start-up condition is determined to be met when the engine oil temperature is lower than the predetermined temperature. If the intake camshaft of the engine is faulty, then the low-speed start-up conditions of the engine are determined to be met.

[0006] Furthermore, sending a low-speed start request to the hybrid system controller, causing the hybrid system controller to control the ISG to maintain low-speed operation of the engine, includes: A low-speed start request is sent to the hybrid system controller. The hybrid system controller queries a pre-stored ISG drag torque limit table to obtain the corresponding drag torque. The ISG drag torque limit table includes drag torque limits corresponding to different engine speeds and different engine oil temperatures. The ISG is controlled to drag the engine at the drag torque to maintain low speed operation.

[0007] Furthermore, before controlling the ISG to drag the engine with the drag torque to maintain low-speed operation, the method further includes: Obtain altitude data; The correction value of the towing torque limit is obtained by querying the pre-stored towing torque limit correction coefficient table based on the altitude data. The towing torque limit correction coefficient table includes multiple altitudes and the corresponding towing torque limit correction coefficients for each altitude. The drag torque limit is corrected according to the drag torque limit correction coefficient.

[0008] Furthermore, the ISG towing torque limit table and the towing torque limit correction coefficient table are pre-calibrated.

[0009] Furthermore, determining the engine injection timing based on engine oil pressure or the top dead center position of cylinder one of the engines includes: When there is no fault in the intake camshaft of the engine, determine whether the engine oil pressure has risen to a predetermined pressure; If so, the moment when the engine oil pressure rises to the predetermined pressure is taken as the timing of the engine's fuel injection ignition.

[0010] Furthermore, determining the engine injection timing based on engine oil pressure or the top dead center position of cylinder one of the engines includes: If the intake camshaft of the engine is faulty, the top dead center position of the first cylinder is located during the low-speed operation of the engine driven by the ISG, and the corresponding moment when the top dead center position of the first cylinder is found is taken as the injection ignition timing of the engine.

[0011] Secondly, a start-up control system for a hybrid vehicle is provided, comprising: The judgment module is used to determine whether the engine low-speed start-up conditions are met; The towing control module is used to send a low-speed start request to the hybrid system controller when the engine low-speed start conditions are met, so that the hybrid system controller controls the ISG to tow the engine to maintain low-speed operation. The determination module is used to determine the engine's fuel injection ignition timing based on the engine oil pressure or the top dead center position of the first cylinder of the engine. The engine start control module is used to control the engine to perform the corresponding fuel injection and ignition actions to start the engine when the fuel injection and ignition timing is reached.

[0012] Thirdly, a vehicle is provided, comprising: a start-up control system for a hybrid vehicle according to the second aspect described above.

[0013] Fourthly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the steps of the starting control method for a hybrid vehicle according to the first aspect and any possible implementation thereof.

[0014] In the embodiments of this application, it is first determined whether the engine low-speed start-up conditions are met. If the conditions are met, a low-speed start-up request is sent to the hybrid system controller, causing the hybrid system controller to control the ISG to maintain the engine at a low speed. Then, based on the engine oil pressure or the top dead center position of the first cylinder compression stroke, the engine's fuel injection ignition timing is determined. When the fuel injection ignition timing is reached, the engine is controlled to perform the corresponding fuel injection ignition action to start the engine. Thus, when the low-speed start-up conditions are met, the ISG is controlled to maintain the engine at a low speed, and the fuel injection ignition timing is determined, achieving precise control of engine start-up and ensuring the durability and start-up reliability of the hybrid vehicle's engine. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A flowchart illustrating the start-up control method for a hybrid vehicle provided in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the execution of the start-up control method for a hybrid vehicle provided in an embodiment of this application. Figure 3 A technical roadmap for the start-up control method of a hybrid vehicle provided in the embodiments of this application; Figure 4 This is a structural block diagram of the start-up control system for a hybrid vehicle provided in an embodiment of this application; Figure 5 This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.

[0017] It should be noted that, unless otherwise specified, the embodiments and features of the embodiments in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] The following describes in detail, with reference to the accompanying drawings, a starting control method, system, vehicle, and device for a hybrid vehicle according to embodiments of this application.

[0019] Figure 1 This is a flowchart of a hybrid vehicle start-up control method according to an embodiment of this application. Figure 1 As shown, and in combination Figure 2 and Figure 3 The hybrid vehicle start-up control method according to an embodiment of this application includes the following steps: S101: Determine whether the engine starts at low speed.

[0020] In one embodiment of this application, determining whether the engine low-speed start-up condition is met includes: determining whether the engine intake camshaft has a fault; if the engine intake camshaft does not have a fault, then when the engine oil temperature is lower than a predetermined temperature, it is determined that the engine low-speed start-up condition is met; if the engine intake camshaft has a fault, then it is determined that the engine low-speed start-up condition is met.

[0021] The engine oil temperature is measured by an oil temperature sensor in the engine, such as... Figure 3 As shown, when the engine oil temperature t o Less than the predetermined temperature t oin At that time, determine that the engine starts at low speed and the engine oil temperature meets the requirements. t o Above another predetermined temperature threshold t oout When this happens, the engine low-speed start condition is exited. To avoid frequently entering and exiting the engine low-speed start condition, t oout It is higher than t oin .

[0022] S102: If the engine low-speed start-up condition is met, a low-speed start-up request is sent to the hybrid system controller, so that the hybrid system controller controls the ISG to drive the engine to maintain low-speed operation.

[0023] In one embodiment of this application, sending a low-speed start request to the hybrid system controller, causing the hybrid system controller to control the ISG to drag the engine to maintain low-speed operation, includes: sending a low-speed start request to the hybrid system controller; the hybrid system controller querying a pre-stored ISG drag torque limit table to obtain the corresponding drag torque; wherein the ISG drag torque limit table includes drag torque limits corresponding to different engine speeds and different engine oil temperatures; and controlling the ISG to drag the engine to maintain low-speed operation with the drag torque.

[0024] In one embodiment of this application, before controlling the ISG to drag the engine to maintain low-speed operation with the drag torque, the method further includes: obtaining altitude data; querying a pre-stored drag torque limit correction coefficient table based on the altitude data to obtain a correction value for the drag torque limit, wherein the drag torque limit correction coefficient table includes multiple altitudes and drag torque limit correction coefficients corresponding to each altitude; and correcting the drag torque limit based on the drag torque limit correction coefficients.

[0025] In one embodiment of this application, the limit table of ISG drag torque and the correction coefficient table of drag torque limit are pre-calibrated.

[0026] In a specific example, Table 1 is a table of limits for ISG traction torque.

[0027] Table 1 Limits of ISG Driving Torque

[0028] As shown in Table 1, where t o Engine oil temperature; n EThe engine speed is the reference point. At the same engine oil temperature, as the engine speed increases, the ISG drag torque gradually decreases to maintain the engine speed at a relatively low value. As shown in Table 1, limiting the ISG drag torque keeps the engine speed at around 300 r / min. Correspondingly, the lower the engine speed, the greater the ISG drag torque should be, especially at 0 RPM, where the ISG drag torque needs to be greater to overcome the engine's inertial torque. At the same engine speed, the lower the engine oil temperature, the greater the oil viscosity, and the greater the resistance when the ISG drags the engine to start. Therefore, the ISG drag torque should be correspondingly larger. Conversely, the higher the engine oil temperature, the lower the oil viscosity, and the less resistance when the ISG drags the engine to start. Therefore, the ISG drag torque can be appropriately smaller.

[0029] In practical applications, as the altitude increases, the pumping loss of the engine decreases, and the resistance when the ISG drives the engine to start will also decrease accordingly. Therefore, the ISG driving torque should also be reduced accordingly. Thus, the ISG driving torque limit in Table 1 is revised again according to the plateau altitude coefficient, as shown in Table 2.

[0030] Table 2 Correction Factors for Driving Torque Limits

[0031] As shown in Table 2, a smaller altitude coefficient r indicates a higher altitude, which reduces engine pumping losses and consequently reduces the resistance of the ISG when starting the engine. The ISG's torque should also be reduced accordingly, therefore, the correction factor should be smaller. Conversely, a larger altitude coefficient r indicates a lower altitude, and the correction factor should be larger. The altitude coefficient r is measured by the air pressure sensor on the engine.

[0032] S103: Determine the engine's fuel injection timing based on the engine oil pressure or the top dead center position of the first cylinder compression stroke.

[0033] In one embodiment of this application, determining the engine injection ignition timing based on engine oil pressure or the top dead center position of the first cylinder of the engine includes: when there is no fault in the engine intake camshaft, determining whether the engine oil pressure has risen to a predetermined pressure; if so, taking the moment when the engine oil pressure rises to the predetermined pressure as the engine injection ignition timing.

[0034] Specifically, such as Figure 3As shown, when the engine oil pressure has not risen to the predetermined pressure, engine fuel injection and ignition are prohibited. The ISG is controlled to drive the engine at a lower speed to maintain operation. Under this condition, since the engine speed is low and there is a certain amount of oil lubrication, there is no risk of wear. Only when the engine oil pressure rises to the predetermined pressure is this moment taken as the engine fuel injection and ignition timing.

[0035] In one embodiment of this application, determining the engine injection ignition timing based on engine oil pressure or the top dead center position of the first cylinder of the engine includes: if the intake camshaft of the engine is faulty, then during the low-speed operation of the engine driven by the ISG, the top dead center position of the first cylinder of the engine is located, and when the top dead center position of the first cylinder of the engine is located, the corresponding moment is taken as the engine injection ignition timing.

[0036] S104: When the fuel injection ignition timing is reached, control the engine to perform the corresponding fuel injection ignition action to start the engine.

[0037] According to the hybrid vehicle start-up control method of this application embodiment, the method first determines whether the engine low-speed start-up condition is met. If the engine low-speed start-up condition is met, a low-speed start-up request is sent to the hybrid system controller, causing the hybrid system controller to control the ISG to drag the engine to maintain low-speed operation. Then, based on the engine oil pressure or the top dead center position of the first cylinder compression stroke, the engine injection ignition timing is determined. When the injection ignition timing is reached, the engine is controlled to perform the corresponding injection ignition action to start the engine. Thus, when the low-speed start-up condition is met, the ISG is controlled to drag the engine to low-speed operation, and the injection ignition timing is determined, achieving precise control of engine start-up, thereby ensuring the durability and start-up reliability of the hybrid vehicle engine.

[0038] Figure 4 This is a structural block diagram of a hybrid vehicle start-up control system according to one embodiment of this application. Figure 4 As shown, the hybrid vehicle start-up control system according to an embodiment of this application includes: a judgment module 410, a towing control module 420, a determination module 430, and a start-up control module 440, wherein: The judgment module 410 is used to determine whether the engine low-speed start-up conditions are met. The towing control module 420 is used to send a low-speed start request to the hybrid system controller when the engine low-speed start condition is met, so that the hybrid system controller controls the ISG to tow the engine to maintain low-speed operation. The determination module 430 is used to determine the engine's fuel injection ignition timing based on the engine oil pressure or the top dead center position of the first cylinder of the engine. The engine start control module 440 is used to control the engine to perform corresponding fuel injection and ignition actions to start the engine when the fuel injection ignition timing is reached.

[0039] According to the hybrid vehicle start-up control system of this application embodiment, it first determines whether the engine low-speed start-up conditions are met. If the engine low-speed start-up conditions are met, a low-speed start-up request is sent to the hybrid system controller, causing the hybrid system controller to control the ISG to drag the engine to maintain low-speed operation. Then, based on the engine oil pressure or the top dead center position of the first cylinder compression stroke, the engine injection ignition timing is determined. When the injection ignition timing is reached, the engine is controlled to perform the corresponding injection ignition action to start the engine. Thus, when the low-speed start-up conditions are met, the ISG is controlled to drag the engine to low-speed operation, and the injection ignition timing is determined, achieving precise control of engine start-up, thereby ensuring the durability and start-up reliability of the hybrid vehicle engine.

[0040] Specific limitations regarding the start-up control system of hybrid vehicles can be found in the above description of the start-up control method for hybrid vehicles, and will not be repeated here. Each module of the aforementioned start-up control system for hybrid vehicles can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0041] In one embodiment, a vehicle is provided, comprising: a hybrid vehicle start-up control system according to any of the above embodiments. The vehicle first determines whether the engine low-speed start-up conditions are met; if the engine low-speed start-up conditions are met, it sends a low-speed start-up request to the hybrid system controller, causing the hybrid system controller to control the ISG to maintain low-speed operation of the engine; then, based on the engine oil pressure or the top dead center position of the first cylinder compression stroke, it determines the engine's fuel injection ignition timing; when the fuel injection ignition timing is reached, it controls the engine to perform the corresponding fuel injection ignition action to start the engine. Thus, by controlling the ISG to maintain low-speed operation of the engine and determining the fuel injection ignition timing when the low-speed start-up conditions are met, precise control of engine start-up is achieved, thereby ensuring the durability and start-up reliability of the hybrid vehicle engine.

[0042] Furthermore, other components and functions of the vehicle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0043] In one embodiment, a computer device is provided. Figure 5 This is a structural block diagram of the computer device provided in the embodiments of this application, with reference to... Figure 5The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned hybrid vehicle start-up control method embodiment. For example, it executes: determining whether the engine low-speed start-up condition is met; If the engine low-speed start-up conditions are met, a low-speed start-up request is sent to the hybrid system controller, which then controls the ISG to drag the engine to maintain low-speed operation. The timing of fuel injection and ignition is determined based on the engine oil pressure or the top dead center position of the first cylinder of the engine. When the fuel injection ignition timing is reached, the engine is controlled to perform the corresponding fuel injection ignition action to start the engine.

[0044] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0046] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A starting control method for a hybrid vehicle, characterized in that, include: Determine whether the conditions for starting the engine at low speed are met; If the engine low-speed start-up conditions are met, a low-speed start-up request is sent to the hybrid system controller, which then controls the ISG to drag the engine to maintain low-speed operation. The timing of fuel injection and ignition is determined based on the engine oil pressure or the top dead center position of the first cylinder of the engine. When the fuel injection ignition timing is reached, the engine is controlled to perform the corresponding fuel injection ignition action to start the engine.

2. The starting control method for a hybrid vehicle according to claim 1, characterized in that, The determination of whether the engine low-speed start-up conditions are met includes: Determine if the intake camshaft of the engine is faulty; If the intake camshaft of the engine is not faulty, then the engine low-speed start-up condition is determined to be met when the engine oil temperature is lower than the predetermined temperature. If the intake camshaft of the engine is faulty, then the low-speed start-up conditions of the engine are determined to be met.

3. The starting control method for a hybrid vehicle according to claim 1, characterized in that, Sending a low-speed start request to the hybrid system controller, causing the hybrid system controller to control the ISG to maintain low-speed operation of the engine, includes: A low-speed start request is sent to the hybrid system controller. The hybrid system controller queries a pre-stored ISG drag torque limit table to obtain the corresponding drag torque. The ISG drag torque limit table includes drag torque limits corresponding to different engine speeds and different engine oil temperatures. The ISG is controlled to drag the engine at the drag torque to maintain low speed operation.

4. The starting control method for a hybrid vehicle according to claim 3, characterized in that, Before controlling the ISG to drag the engine at the drag torque to maintain low-speed operation, the following is also included: Obtain altitude data; The correction value of the towing torque limit is obtained by querying the pre-stored towing torque limit correction coefficient table based on the altitude data. The towing torque limit correction coefficient table includes multiple altitudes and the corresponding towing torque limit correction coefficients for each altitude. The drag torque limit is corrected according to the drag torque limit correction coefficient.

5. The starting control method for a hybrid vehicle according to claim 4, characterized in that, The ISG towing torque limit table and the towing torque limit correction coefficient table are pre-calibrated.

6. The starting control method for a hybrid vehicle according to claim 1, characterized in that, The process of determining the engine's fuel injection timing based on engine oil pressure or the top dead center position of cylinder one includes: When there is no fault in the intake camshaft of the engine, determine whether the engine oil pressure has risen to a predetermined pressure; If so, the moment when the engine oil pressure rises to the predetermined pressure is taken as the timing of the engine's fuel injection ignition.

7. The starting control method for a hybrid vehicle according to claim 1, characterized in that, The process of determining the engine's fuel injection timing based on engine oil pressure or the top dead center position of cylinder one includes: If the intake camshaft of the engine is faulty, the top dead center position of the first cylinder is located during the low-speed operation of the engine driven by the ISG, and the corresponding moment when the top dead center position of the first cylinder is found is taken as the injection ignition timing of the engine.

8. A starting control system for a hybrid vehicle, characterized in that, include: The judgment module is used to determine whether the engine low-speed start-up conditions are met; The towing control module is used to send a low-speed start request to the hybrid system controller when the engine low-speed start conditions are met, so that the hybrid system controller controls the ISG to tow the engine to maintain low-speed operation. The determination module is used to determine the engine's fuel injection ignition timing based on the engine oil pressure or the top dead center position of the first cylinder of the engine. The engine start control module is used to control the engine to perform the corresponding fuel injection and ignition actions to start the engine when the fuel injection and ignition timing is reached.

9. A vehicle, characterized in that, include: The start-up control system for a hybrid vehicle according to claim 8.

10. 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 program, it implements the start-up control method for a hybrid vehicle according to any one of claims 1-7.

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