Engine control method and device and vehicle

Abstract

The invention discloses an engine control method and device and a vehicle, which are applied to the operation condition of a mixed methanol engine, and the control method comprises the following steps: acquiring the battery charge state of the mixed methanol engine; determining the initial power generation power of the mixed methanol engine according to the battery charge state; in the running process of the mixed methanol engine, the cooling liquid temperature of the mixed methanol engine is obtained; and the initial generation power of the mixed methanol engine is adjusted according to the cooling liquid temperature and the first threshold value. According to the control method provided by the invention, the battery charge state and the temperature information of the cooling liquid are combined, and the initial starting power of the mixed methanol engine is adjusted in real time, so that knocking and fire accidents of the mixed methanol engine in the operation process are avoided, and safe operation of the methanol engine is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of engine control technology, and in particular to an engine control method, device, and vehicle. Background Technology

[0002] The core objective of hybrid power generation strategies based on SOC (State of Charge) is to design range-extending strategies that balance engine power, emissions, and fuel economy by monitoring battery charge in real time. For methanol engines, methanol fuel is more prone to abnormal combustion phenomena such as knocking or misfires compared to traditional ignition-based engines like gasoline. These abnormal combustion phenomena severely limit the power and torque increases of methanol engines and pose a significant challenge to engine reliability. Summary of the Invention

[0003] This invention provides a method, device, and vehicle for controlling an engine. First, the initial power output of the hybrid methanol engine is determined based on the battery state of charge. Second, the initial power output of the hybrid methanol engine is adjusted in real time based on the coolant temperature. The control method provided by this invention combines battery state of charge and coolant temperature information to adjust the initial starting power of the hybrid methanol engine in real time, thereby avoiding knocking and misfires during operation and preventing damage to the machine.

[0004] According to a first aspect of the present invention, an engine control method is provided, applied to the operating conditions of a methanol-blended engine, the control method comprising:

[0005] Obtain the battery state of charge of the hybrid methanol engine;

[0006] The initial power generation of the hybrid methanol engine is determined based on the battery state of charge.

[0007] During the operation of the hybrid methanol engine, the coolant temperature of the hybrid methanol engine is obtained;

[0008] The initial power generation of the hybrid methanol engine is adjusted according to the coolant temperature and a first threshold.

[0009] Optionally, determining the initial power generation of the hybrid methanol engine based on the battery state of charge includes:

[0010] When the battery state of charge is greater than or equal to the second threshold, the initial power generation is adjusted to the first initial power generation.

[0011] When the battery state of charge is less than the second threshold and greater than or equal to the third threshold, the initial power generation is adjusted to the second initial power generation.

[0012] When the battery state of charge is less than the third threshold, the initial power generation is adjusted to the third initial power generation; wherein the second threshold is greater than the third threshold, the first initial power generation is less than the second initial power generation, and the second initial power generation is less than the third initial power generation.

[0013] Optionally, adjusting the initial power generation of the methanol-mixed engine based on the coolant temperature and the first threshold includes:

[0014] When the coolant temperature is lower than the first threshold, the starting state of the methanol-mixed engine is controlled to be motor reverse start;

[0015] When the coolant temperature is greater than or equal to the first threshold, the adjustment mode of the initial power generation of the methanol-mixed engine is determined.

[0016] Optionally, the step of determining the adjustment method for the initial power generation of the methanol-fueled engine when the coolant temperature is greater than or equal to the first threshold includes:

[0017] Obtain the motor reverse speed of the hybrid methanol engine;

[0018] The adjustment method for the initial power generation of the hybrid methanol engine is determined based on the relationship between the motor reverse speed and the fourth threshold.

[0019] Optionally, the method for adjusting the initial power generation of the hybrid methanol engine based on the relationship between the motor reversing rate and the fourth threshold includes:

[0020] The cylinder vibration frequency and single-cylinder speed fluctuation rate of the hybrid methanol engine are obtained.

[0021] When the motor reverse speed is greater than the fourth threshold, the cylinder vibration frequency is less than the fifth threshold, and the single cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the motor reverse speed rise rate of the mixed methanol engine is controlled to decrease by a first preset value.

[0022] When the motor's reverse speed is less than or equal to the fourth threshold, the initial power generation of the hybrid methanol engine is adjusted.

[0023] Optionally, adjusting the initial power generation of the methanol-mixed engine when the motor's reverse speed is less than or equal to the fourth threshold includes:

[0024] The initial power generation method of the hybrid methanol engine is determined based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold.

[0025] Optionally, the method for adjusting the initial power generation of the hybrid methanol engine based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold includes:

[0026] When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single cylinder speed fluctuation rate is less than the sixth threshold, the initial power generation of the hybrid methanol engine is adjusted to the third initial power generation.

[0027] When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single-cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fourth initial power generation; wherein the third initial power generation is greater than the fourth initial power generation.

[0028] Optionally, the method for adjusting the initial power generation of the hybrid methanol engine based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold includes:

[0029] When the cylinder vibration frequency is less than the fifth threshold and the single cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fifth initial power generation.

[0030] When the cylinder vibration frequency is less than the fifth threshold and the single-cylinder speed fluctuation rate is less than the sixth threshold, the methanol-mixed engine is controlled to operate at the initial power generation.

[0031] According to a second aspect of the present invention, an engine control device is provided, applicable to the operating conditions of a methanol-blended engine, the control device being used to execute the engine control method described in any one of the first aspects of the present invention, the engine control device comprising:

[0032] The acquisition module is used to acquire the battery state of charge of the hybrid methanol engine and the coolant temperature of the hybrid methanol engine during operation.

[0033] An initial power generation determination module is used to determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0034] An adjustment module is used to adjust the initial power generation of the methanol-mixed engine based on the relationship between the coolant temperature and a first threshold.

[0035] According to a third aspect of the present invention, a vehicle is provided, characterized in that it includes a control device for the engine described in the second aspect of the present invention and a methanol-blended engine.

[0036] This invention discloses an engine control method, device, and vehicle applied to the operating conditions of a hybrid methanol engine. The control method includes: acquiring the battery state of charge (SBC) of the hybrid methanol engine; determining the initial power output of the hybrid methanol engine based on the SBC; acquiring the coolant temperature of the hybrid methanol engine during operation; and adjusting the initial power output of the hybrid methanol engine based on the relationship between the coolant temperature and a first threshold. The engine control method provided by this invention first determines the initial power output of the hybrid methanol engine based on the battery SBC, and then adjusts the initial power output of the hybrid methanol engine in real time based on the coolant temperature. This control method combines battery SBC and coolant temperature information to adjust the initial starting power of the hybrid methanol engine in real time, thereby preventing knocking and misfires during operation and ensuring the safe operation of the hybrid methanol engine.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of an engine control method provided in an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0041] Figure 3 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0042] Figure 4 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0043] Figure 5 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of a methanol-fueled hybrid engine equipped with a knock sensor and a speed sensor, provided in an embodiment of the present invention.

[0045] Figure 7 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0046] Figure 8 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0047] Figure 9 This is a flowchart of another engine control method provided in an embodiment of the present invention;

[0048] Figure 10 This is a schematic diagram of the structure of an engine control device provided in an embodiment of the present invention. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0052] Figure 1 This is a flowchart of an engine control method provided in an embodiment of the present invention, for reference. Figure 1 This invention provides a control method for an engine, applied to the operating conditions of a hybrid methanol engine. The hybrid methanol engine includes an electric motor drive unit and an internal combustion engine that uses methanol as fuel, meaning that the vehicle's functions are provided jointly by the power of the battery and the power of the internal combustion engine. The control method includes:

[0053] S101. Obtain the battery state of charge of the hybrid methanol engine.

[0054] Among them, the State of Charge (SOC) is a parameter describing the remaining capacity of the battery. It is usually expressed as a percentage and is basically defined as SOC = (current remaining battery capacity / total rated battery capacity) × 100%. For example, if a battery with a rated capacity of 50kWh has a remaining capacity of 30kWh, then the SOC is 60%.

[0055] Specifically, the vehicle's battery state of charge is obtained based on information such as the voltage, current, and temperature of the hybrid methanol engine's battery.

[0056] S102. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0057] Specifically, based on the battery state of charge obtained in step S101 above, the initial power generation of the methanol-hybrid engine is determined. The initial power generation is the initial power generation of the methanol-hybrid engine. For example, when the battery state of charge is greater than or equal to 80%, it proves that the battery power of the methanol-hybrid engine is relatively sufficient, and the methanol-hybrid engine is controlled to provide power to the motor with a smaller power generation; when the battery state of charge is less than or equal to 30%, it proves that the battery power of the methanol-hybrid engine is relatively scarce, and the methanol-hybrid engine is controlled to provide power to the motor with a larger power generation; when the battery state of charge is between 30% and 80%, it proves that the battery power of the methanol-hybrid engine is relatively moderate, and the methanol-hybrid engine is controlled to provide power to the motor with a moderate power generation.

[0058] S103. During the operation of the methanol-blended engine, the coolant temperature of the methanol-blended engine is obtained.

[0059] Specifically, a temperature sensor is installed on the cooling pipe of the methanol-blended engine. When the methanol-blended engine starts with its initial power generation, the signal from the temperature sensor installed on the cooling pipe is acquired during the operation of the methanol-blended engine to obtain the coolant temperature of the methanol-blended engine.

[0060] S104. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0061] Specifically, based on the coolant temperature of the methanol-mixed engine obtained in step S103 above, the initial power generation of the methanol-mixed engine is adjusted in real time according to the coolant temperature. For example, when the coolant temperature is less than 60%, the starting state of the methanol-mixed engine is adjusted to motor reverse start.

[0062] The engine control method provided by this invention first determines the initial power generation of the hybrid methanol engine based on the battery state of charge of the hybrid methanol engine, and then adjusts the initial power generation of the hybrid methanol engine in real time based on the temperature of the coolant of the hybrid methanol engine. The control method provided by this invention combines the battery state of charge and coolant temperature information to adjust the initial starting power of the hybrid methanol engine in real time, so as to avoid knocking and misfire during the operation of the hybrid methanol engine and ensure the safe operation of the hybrid methanol engine.

[0063] Based on the above embodiments, the present invention further refines the determination of the initial power generation of the hybrid methanol engine according to the battery state of charge. Figure 2 This is a flowchart of another engine control method provided in an embodiment of the present invention, for reference. Figure 2 The engine control method provided in this embodiment of the invention includes:

[0064] S201. Obtain the battery state of charge of the hybrid methanol engine.

[0065] S202. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0066] S2021. When the battery state of charge is greater than or equal to the second threshold, the initial power generation is adjusted to the first initial power generation.

[0067] Specifically, when the battery state of charge is greater than or equal to the second threshold (e.g., 80%), for example, when the battery state of charge is 95%, it proves that the battery power of the hybrid methanol engine is sufficient. Then, the initial power generation of the hybrid methanol engine is adjusted to the first initial power generation (e.g., 20kW) to meet the kinetic energy of the motor drive part in the hybrid methanol engine.

[0068] S2022. When the battery state of charge is less than the second threshold and greater than or equal to the third threshold, the initial power generation is adjusted to the second initial power generation.

[0069] Specifically, when the battery state of charge is less than the second threshold (e.g., 80%) and greater than or equal to the third threshold (e.g., 30%), for example, when the battery state of charge is 50%, it is proven that the battery power of the hybrid methanol engine is moderate. Then, the initial power generation of the hybrid methanol engine is adjusted to the second initial power generation (e.g., 50kW) to meet the kinetic energy of the motor drive part in the hybrid methanol engine.

[0070] S2023. When the battery state of charge is less than the third threshold, the initial power generation is adjusted to the third initial power generation.

[0071] Specifically, when the battery state of charge is less than the third threshold (e.g., 30%), for example, when the battery state of charge is 25%, it indicates that the battery power of the hybrid methanol engine is relatively low. In this case, the initial power generation of the hybrid methanol engine is adjusted to the third initial power generation (e.g., 80kW) to meet the kinetic energy requirements of the motor drive section in the hybrid methanol engine.

[0072] S203. During the operation of the methanol-blended engine, obtain the coolant temperature of the methanol-blended engine.

[0073] S204. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0074] Among them, the second threshold is greater than the third threshold, the first initial power generation is less than the second initial power generation, and the second initial power generation is less than the third initial power generation.

[0075] Based on the above embodiments, the present invention further refines the adjustment of the initial power generation of the methanol-mixed engine according to the coolant temperature and a first threshold. Figure 3 This is a flowchart of another engine control method provided in an embodiment of the present invention, for reference. Figure 3 The engine control method provided in this embodiment of the invention includes:

[0076] S301. Obtain the battery state of charge of the hybrid methanol engine.

[0077] S302. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0078] S303. During the operation of the methanol-blended engine, obtain the coolant temperature of the methanol-blended engine.

[0079] S304. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0080] S3041. When the coolant temperature is less than the first threshold, the starting state of the methanol-mixed engine is controlled to be reverse-drive starting by the electric motor.

[0081] Specifically, when the temperature sensor installed in the cooling pipe of the methanol-blended engine detects that the coolant temperature is lower than the first threshold, for example, if the coolant temperature is 50°C and the first threshold is 60°C, then the coolant temperature being lower than the first threshold indicates that the methanol-blended engine has misfired during a cold start. Misfire is a phenomenon where the air-fuel mixture in the engine fails to ignite properly or burns incompletely, which seriously damages the normal operation of the methanol-blended engine. At this time, the starting state of the methanol-blended engine is adjusted to reverse start with an electric motor. On the one hand, this can expel excess fuel, and on the other hand, with the assistance of a water boiler, the coolant in the engine body can circulate to accelerate warm-up and reduce the occurrence of misfire.

[0082] S3042. When the coolant temperature is greater than or equal to the first threshold, determine the adjustment method of the initial power generation of the methanol-mixed engine.

[0083] Specifically, when the temperature sensor installed in the cooling pipe of the hybrid methanol engine detects that the coolant temperature is greater than or equal to the first threshold, for example, the coolant temperature is 70°C and the first threshold is 60°C, then the initial power generation adjustment method of the hybrid methanol engine is further determined to further meet the kinetic energy of the motor drive part in the hybrid methanol engine.

[0084] Based on the above embodiments, the present invention further refines the method for adjusting the initial power generation of the methanol-mixed engine when the coolant temperature is greater than or equal to a first threshold. Figure 4 This is a flowchart of another engine control method provided in an embodiment of the present invention. (Reference) Figure 4 The engine control method provided in this embodiment of the invention includes:

[0085] S401. Obtain the battery state of charge of the hybrid methanol engine.

[0086] S402. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0087] S403. During the operation of the methanol-blended engine, obtain the coolant temperature of the methanol-blended engine.

[0088] S404. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0089] S405. When the coolant temperature is greater than or equal to the first threshold, determine the adjustment method of the initial power generation of the methanol-mixed engine.

[0090] S406, Obtain the motor reverse speed of the methanol-blended engine.

[0091] Specifically, an electric motor is a device that converts electrical energy into mechanical energy, while reverse motor refers to operating the motor as a generator, that is, using the inertia of the vehicle's tires to convert mechanical energy into electrical energy, thereby providing electrical energy to the motor.

[0092] The reverse drag power of the motor of the methanol-blended engine within a unit time period is obtained. The reverse drag rate of the motor of the methanol-blended engine is determined by the ratio of the reverse drag power of the motor of the methanol-blended engine to the unit time.

[0093] S407. Determine the adjustment method of the initial power generation of the hybrid methanol engine based on the relationship between the motor reverse speed and the fourth threshold.

[0094] Specifically, the motor back-dragging rate of the hybrid methanol engine calculated in step S406 above is used to determine the adjustment method of the initial power generation of the hybrid methanol engine. For example, if the motor back-dragging rate is 5kW / s and the fourth threshold is 4kW / s, it proves that the motor back-dragging rate of the hybrid methanol engine is rising too fast, so it is necessary to adjust the motor back-dragging rate of the hybrid methanol engine.

[0095] Based on the above embodiments of the invention, the embodiments of the present invention further refine the method for adjusting the initial power generation of the methanol-mixed engine according to the relationship between the motor reverse speed and the fourth threshold. Figure 5 This is a flowchart of another engine control method provided in an embodiment of the present invention, for reference. Figure 5 The engine control method provided in this embodiment of the invention includes:

[0096] S501, Obtain the battery state of charge of the hybrid methanol engine.

[0097] S502. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0098] S503. During the operation of the methanol-blended engine, the coolant temperature of the methanol-blended engine is obtained.

[0099] S504. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0100] S505. When the coolant temperature is greater than or equal to the first threshold, determine the adjustment method of the initial power generation of the methanol-mixed engine.

[0101] S506, Obtain the motor reverse speed of the methanol-blended engine.

[0102] S507. Determine the adjustment method of the initial power generation of the mixed methanol engine based on the relationship between the motor reverse speed and the fourth threshold.

[0103] S508, Obtain the cylinder vibration frequency and single-cylinder speed fluctuation rate of the hybrid methanol engine.

[0104] Figure 6 This is a schematic diagram of the installation of a knock sensor and a speed sensor in a hybrid methanol engine according to an embodiment of the present invention. (Refer to...) Figure 6 The hybrid methanol engine provided in this embodiment of the invention includes a knock sensor 1, a speed sensor 2, a cylinder head 3, a methanol injector 4, a spark plug 5, a piston 6, and a crankshaft 7. The knock sensor 1 is used to detect the cylinder vibration frequency of the hybrid methanol engine, and the speed sensor 2 is used to detect the single-cylinder speed of the hybrid methanol engine. The single-cylinder speed fluctuation rate refers to the instantaneous change rate of the crankshaft 7 of the hybrid methanol engine. The ratio of the single-cylinder speed of the crankshaft 7 to the unit time is the single-cylinder speed fluctuation rate of the hybrid methanol engine, and the unit is revolutions per minute per second.

[0105] S5081. When the motor back-dragging rate is greater than the fourth threshold, the cylinder vibration frequency is less than the fifth threshold, and the single-cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the motor back-dragging rate of the methanol-mixed engine is reduced by the first preset value.

[0106] Specifically, the motor reverse speed, cylinder vibration frequency, and single-cylinder speed fluctuation rate of the mixed methanol engine obtained in steps S506 and S508 are used to adjust the motor reverse speed of the mixed methanol engine. For example, when the motor reverse speed of the mixed methanol engine is greater than 4 kW / s, the cylinder vibration frequency is less than 5 kHz, and the single-cylinder speed fluctuation rate is greater than or equal to 10 revolutions per minute per second, it is because the motor reverse power of the mixed methanol engine is rising too fast. In this case, it is necessary to control the motor reverse speed of the mixed methanol engine to be reduced by 25%, that is, to adjust the motor reverse speed of the mixed methanol engine to 75% of the original speed.

[0107] S5082. When the motor reverse speed is less than or equal to the fourth threshold, the initial power generation of the methanol-mixed engine is adjusted.

[0108] Specifically, when the motor reverse speed is less than or equal to the fourth threshold (e.g., 4 kW / s), the initial power generation of the hybrid methanol engine is further adjusted.

[0109] Based on the above embodiments of the invention, the embodiments of the present invention further refine the adjustment of the initial power generation of the methanol-mixed engine when the motor reverse speed is less than or equal to the fourth threshold. Figure 7 This is a flowchart of another engine control method provided in an embodiment of the present invention, for reference. Figure 7 The engine control method provided in this embodiment of the invention includes:

[0110] S601. Obtain the battery state of charge of the hybrid methanol engine.

[0111] S602. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0112] S603. During the operation of the methanol-blended engine, the coolant temperature of the methanol-blended engine is obtained.

[0113] S604. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0114] S605. Obtain the cylinder vibration frequency and single-cylinder speed fluctuation rate of the methanol-blended engine.

[0115] S606. When the motor reverse speed is less than or equal to the fourth threshold, the initial power generation of the methanol-mixed engine is adjusted.

[0116] S607. The method for adjusting the initial starting power of the methanol-mixed engine is determined based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold.

[0117] Specifically, in step S605 above, the cylinder vibration frequency and single-cylinder speed of the hybrid methanol engine are obtained by the knock sensor and the speed sensor. Based on the relationship between the cylinder vibration frequency and the fifth threshold, and the relationship between the single-cylinder speed fluctuation rate and the sixth threshold, the adjustment method of the initial starting power of the hybrid methanol engine is further determined.

[0118] Based on the above embodiments, the present invention further refines the method for adjusting the initial power generation of the methanol-mixed engine according to the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold. Figure 8 This is a flowchart of another engine control method provided in an embodiment of the present invention, for reference. Figure 8 The engine control method provided in this embodiment of the invention includes:

[0119] S701, Obtain the battery state of charge of the hybrid methanol engine.

[0120] S702. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0121] S703. During the operation of the methanol-blended engine, the coolant temperature of the methanol-blended engine is obtained.

[0122] S704. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0123] S705, Obtain the cylinder vibration frequency and single-cylinder speed fluctuation rate of the methanol-blended engine.

[0124] S706. When the motor reverse speed is less than or equal to the fourth threshold, the initial power generation of the methanol-mixed engine is adjusted.

[0125] S707. The method for adjusting the initial starting power of the methanol-blended engine is determined based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold.

[0126] S7071. When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single-cylinder speed fluctuation rate is less than the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the third initial power generation.

[0127] Specifically, when the detected cylinder vibration frequency of the methanol-fueled engine is greater than or equal to the fifth threshold (e.g., 15 kHz), and the single-cylinder speed fluctuation rate of the methanol-fueled engine is less than 8 revolutions per minute per second, that is, when a knock signal is detected in the methanol-fueled engine but no misfire signal is detected, it means that the methanol-fueled engine has experienced a knock accident but no misfire accident. In this case, the initial power generation of the methanol-fueled engine needs to be adjusted to the third initial power generation.

[0128] S7072. When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single-cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fourth initial power generation.

[0129] Specifically, when the detected cylinder vibration frequency of the methanol-fueled engine is greater than or equal to the fifth threshold (e.g., 15 kHz), and the single-cylinder speed fluctuation rate of the methanol-fueled engine is greater than or equal to 8 revolutions per minute per second, that is, when knock and misfire signals of the methanol-fueled engine are detected, it means that a knock and misfire accident has occurred in the methanol-fueled engine. In this case, it is necessary to adjust the ignition advance angle of the methanol-fueled engine and adjust the initial power generation corresponding to the torque to the fourth initial power generation, where the third initial power generation is greater than the fourth initial power generation.

[0130] Based on the above embodiments, the present invention further refines the method for adjusting the initial power generation of the methanol-mixed engine according to the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold. Figure 9 This is a flowchart of another engine control method provided in an embodiment of the present invention. (Reference) Figure 9 The engine control method provided in this embodiment of the invention includes:

[0131] S801, Obtain the battery state of charge of the hybrid methanol engine.

[0132] S802. Determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0133] S803. During the operation of the methanol-blended engine, the coolant temperature of the methanol-blended engine is obtained.

[0134] S804. Adjust the initial power generation of the methanol-mixed engine according to the coolant temperature and the first threshold.

[0135] S805, Obtain the cylinder vibration frequency and single-cylinder speed fluctuation rate of the methanol-blended engine.

[0136] S806. When the motor reverse speed is less than or equal to the fourth threshold, the initial power generation of the methanol-mixed engine is adjusted.

[0137] S807. The method for adjusting the initial starting power of the methanol-mixed engine is determined based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold.

[0138] S8071. When the cylinder vibration frequency is less than the fifth threshold and the single-cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fifth initial power generation.

[0139] Specifically, when the detected cylinder vibration frequency of the methanol-blended engine is less than the fifth threshold (e.g., 8 kHz), and the single-cylinder speed fluctuation rate of the methanol-blended engine is greater than or equal to 10 revolutions per minute per second, that is, when a misfire signal is detected but no knock signal is detected, it means that the methanol-blended engine has experienced a misfire but no knock accident. In this case, it is necessary to adjust the initial power generation of the methanol-blended engine to the fifth initial power generation.

[0140] S8072. When the cylinder vibration frequency is less than the fifth threshold and the single cylinder speed fluctuation rate is less than the sixth threshold, the methanol-mixed engine is controlled to operate at the initial power generation.

[0141] Specifically, when the detected cylinder vibration frequency of the methanol-blended engine is less than the fifth threshold (e.g., 8 kHz) and the single-cylinder speed fluctuation rate of the methanol-blended engine is less than 8 revolutions per minute per second, that is, when no misfire or knock signal is detected in the methanol-blended engine, it means that the methanol-blended engine has not experienced a misfire or knock accident. At this time, the methanol-blended engine is working normally, and the methanol-blended engine is controlled to work at the initial power generation.

[0142] Based on the same inventive concept, embodiments of the present invention also provide an engine control device. Figure 10 This is a schematic diagram of the structure of an engine control device provided in an embodiment of the present invention, for reference. Figure 10 This is applied to the operating conditions of a methanol-blended engine. The control device is used to execute the engine control method in any of the above embodiments of the invention. The engine control device includes:

[0143] Module A is used to acquire the battery state of charge of the hybrid methanol engine and the coolant temperature of the hybrid methanol engine during operation.

[0144] Initial power generation determination module B is used to determine the initial power generation of the hybrid methanol engine based on the battery state of charge.

[0145] The regulating module C is used to adjust the initial power generation of the methanol-mixed engine based on the coolant temperature and a first threshold.

[0146] The engine control device provided in this embodiment of the invention can achieve the same technical effect as the engine control method provided in any of the above embodiments of the invention, and will not be described again here.

[0147] According to the same inventive concept, embodiments of the present invention also provide a vehicle, including the engine control device and the hybrid methanol engine described in the above embodiments.

[0148] The vehicle provided in this embodiment of the invention can achieve the same technical effect as the engine control device provided in the above-described embodiment of the invention, and will not be described again here.

[0149] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method of an engine characterized by comprising: The control method, applied to the operating conditions of a methanol-blended engine, includes: Obtain the battery state of charge of the hybrid methanol engine; The initial power generation of the hybrid methanol engine is determined based on the battery state of charge. During the operation of the hybrid methanol engine, the coolant temperature of the hybrid methanol engine is obtained; The initial power generation of the hybrid methanol engine is adjusted according to the coolant temperature and a first threshold.

2. The control method of an engine according to claim 1, characterized by, Determining the initial power generation of the hybrid methanol engine based on the battery state of charge includes: When the battery state of charge is greater than or equal to the second threshold, the initial power generation is adjusted to the first initial power generation. When the battery state of charge is less than the second threshold and greater than or equal to the third threshold, the initial power generation is adjusted to the second initial power generation. When the battery state of charge is less than the third threshold, the initial power generation is adjusted to the third initial power generation; wherein the second threshold is greater than the third threshold, the first initial power generation is less than the second initial power generation, and the second initial power generation is less than the third initial power generation.

3. The control method of an engine according to claim 1, characterized by, The step of adjusting the initial power generation of the methanol-mixed engine based on the coolant temperature and a first threshold includes: When the coolant temperature is lower than the first threshold, the starting state of the methanol-mixed engine is controlled to be motor reverse start; When the coolant temperature is greater than or equal to the first threshold, the adjustment mode of the initial power generation of the methanol-mixed engine is determined.

4. The engine control method according to claim 3, characterized in that, The step of determining the adjustment method for the initial power generation of the methanol-mixed engine when the coolant temperature is greater than or equal to the first threshold includes: Obtain the motor reverse speed of the hybrid methanol engine; The adjustment method for the initial power generation of the hybrid methanol engine is determined based on the relationship between the motor reverse speed and the fourth threshold.

5. The engine control method according to claim 4, characterized in that, The method for determining the initial power generation of the hybrid methanol engine based on the relationship between the motor reversing rate and the fourth threshold includes: The cylinder vibration frequency and single-cylinder speed fluctuation rate of the hybrid methanol engine are obtained. When the motor reverse speed is greater than the fourth threshold, the cylinder vibration frequency is less than the fifth threshold, and the single cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the motor reverse speed rise rate of the mixed methanol engine is controlled to decrease by a first preset value. When the motor's reverse speed is less than or equal to the fourth threshold, the initial power generation of the methanol-blended engine is adjusted.

6. The engine control method according to claim 5, characterized in that, When the motor's reverse speed is less than or equal to the fourth threshold, adjusting the initial power generation of the methanol-mixed engine includes: The initial power generation method of the hybrid methanol engine is determined based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold.

7. The engine control method according to claim 6, characterized in that, The method for adjusting the initial power generation of the methanol-mixed engine based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold includes: When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single cylinder speed fluctuation rate is less than the sixth threshold, the initial power generation of the hybrid methanol engine is adjusted to the third initial power generation. When the cylinder vibration frequency is greater than or equal to the fifth threshold and the single-cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fourth initial power generation; wherein the third initial power generation is greater than the fourth initial power generation.

8. The engine control method according to claim 6, characterized in that, The method for adjusting the initial power generation of the methanol-mixed engine based on the cylinder vibration frequency, the fifth threshold, the single-cylinder speed fluctuation rate, and the sixth threshold includes: When the cylinder vibration frequency is less than the fifth threshold and the single cylinder speed fluctuation rate is greater than or equal to the sixth threshold, the initial power generation of the methanol-mixed engine is adjusted to the fifth initial power generation. When the cylinder vibration frequency is less than the fifth threshold and the single-cylinder speed fluctuation rate is less than the sixth threshold, the methanol-mixed engine is controlled to operate at the initial power generation.

9. A control device for an engine, characterized in that, The control device is applied to the operating conditions of a methanol-blended engine, and is used to execute the engine control method according to any one of claims 1 to 8. The engine control device includes: The acquisition module is used to acquire the battery state of charge of the hybrid methanol engine and the coolant temperature of the hybrid methanol engine during operation. An initial power generation determination module is used to determine the initial power generation of the hybrid methanol engine based on the battery state of charge. An adjustment module is used to adjust the initial power generation of the methanol-mixed engine based on the coolant temperature and a first threshold.

10. A vehicle, characterized in that, Includes the control device for the engine as described in claim 9 and the methanol-blended engine.

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