Engine control method and system and electronic equipment

Abstract

The invention relates to the field of automobile driving, and provides an engine control method and system and electronic equipment. The method comprises the following steps of S1, detecting whether a vehicle is in a reverse towing working condition or not; s2, if the vehicle is in the reverse towing working condition, operation information of a current engine is obtained; the operation information at least comprises an engine fuel oil way state, a gearbox gear shifting state and an engine braking state; s3, based on the engine operation information, whether the vehicle meets a first preset condition or not is judged; and S4, if the vehicle meets the first preset condition, an economic reverse towing control strategy is triggered so as to control the vehicle to run in an economic reverse towing mode. Compared with the prior art, the negative torque of the engine can be effectively reduced under the reverse towing working condition, and the coasting distance of the vehicle is increased.

Description

Technical Field

[0001] The present application relates to the field of automobile driving, and in particular to an engine control method, system and electronic equipment. Background Art

[0002] Current control strategies for engine energy consumption primarily focus on optimizing the combustion process, specifically optimizing energy consumption when the engine is in positive torque-driven operation. Existing technologies primarily employ single-control throttle or EGR valves, primarily for exhaust temperature management and component lifespan. Alternatively, improvements to engine hardware can optimize lubrication and reduce friction losses. However, there are currently no effective solutions for optimizing engine energy consumption during reverse towing or coasting conditions.

[0003] Based on the above, there is an urgent need for an engine control method, system and electronic device to overcome at least one of the above technical problems. Summary of the Invention

[0004] The present invention aims to provide an engine control method, system, and electronic device that reduce engine negative torque and vehicle energy consumption during reverse towing. The specific solution is as follows:

[0005] An engine control method, comprising the following steps:

[0006] S1: Detect whether the vehicle is in reverse towing condition;

[0007] S2: If the vehicle is in reverse towing mode, obtain the current engine operation information;

[0008] S3: determining whether the vehicle meets a first preset condition based on the engine operating information;

[0009] S4: If the vehicle meets the first preset condition, the economic reverse towing control strategy is triggered to control the vehicle to travel in an economic reverse towing manner.

[0010] Optionally, the operating information includes at least: engine fuel circuit status, transmission shift status and engine braking status.

[0011] Optional, S3, including:

[0012] Based on the engine's operating information, determine the engine's operating status;

[0013] When the operating state of the engine is a first state and the first state is maintained for a first preset time, it is determined that the vehicle meets the first preset condition;

[0014] The first state needs to simultaneously meet the following conditions: the engine fuel circuit state is a fuel cut-off state, the transmission is a non-shifting state, and the engine brake state is an inactive state.

[0015] Optional, S4, specifically including:

[0016] Based on the constraint conditions, a target throttle opening value of the engine is set, and the throttle opening is controlled; wherein the constraint conditions include at least: emission constraint conditions and mechanical constraint conditions;

[0017] In response to the throttle opening state, obtaining a theoretical intake manifold intake pressure corresponding to a minimum reverse torque of the engine in a reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure; and

[0018] The second preset method is used to obtain the EGR valve opening value.

[0019] Optionally, in response to the throttle opening state, obtaining a theoretical intake manifold intake pressure corresponding to a minimum reverse torque of the engine in the reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure, specifically includes:

[0020] The engine bench test method is used to measure the engine reverse torque data at different intake pressures to form an intake manifold pressure-reverse torque mapping curve;

[0021] According to the intake manifold pressure-reverse drag torque mapping curve, the theoretical intake manifold intake pressure for the minimum reverse drag torque is obtained;

[0022] Set the theoretical intake manifold intake pressure to the optimal intake pressure.

[0023] Optionally, the second preset method is used to obtain the EGR valve opening value, specifically including:

[0024] When the engine throttle opening meets the constraint conditions, the actual intake pressure of the intake manifold is collected in real time;

[0025] Taking the optimal intake pressure as the target, the EGR valve opening value is calculated according to the difference between the optimal intake pressure and the actual intake pressure.

[0026] Optionally, the following steps are also included:

[0027] When the engine throttle opening is within the constraint range, the engine intake valve delay mechanism is triggered;

[0028] Based on the engine intake valve delay mechanism, the VVA device is controlled to switch to the large Miller camshaft.

[0029] Optionally, the economic reverse drag control strategy further includes the following steps:

[0030] In response to the engine intake valve delay mechanism, according to the engine electronically controlled accessory energy saving strategy; wherein, the engine electronically controlled accessory energy saving strategy includes:

[0031] Based on the actual working requirements of the engine reverse towing condition, the engine electronically controlled accessories are controlled to operate according to their corresponding preset calibration values; the engine electronically controlled accessories include at least: an oil pump, a water pump, an air compressor and a fan; wherein, the actual working requirements include at least: safety use requirements and electronic control function requirements.

[0032] An engine control system comprising:

[0033] A detection module configured to detect whether the vehicle is in a reverse towing condition;

[0034] an acquisition module configured to acquire current engine operating information if the vehicle is in a reverse towing condition;

[0035] a judgment module configured to judge whether the vehicle meets a first preset condition based on the engine operation information;

[0036] The strategy module is configured to trigger an economic reverse drag control strategy to control vehicle driving if the vehicle meets a first preset condition.

[0037] An electronic device comprises: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0038] A computer program is stored in the memory, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method.

[0039] A computer-readable storage medium stores a computer program / instruction thereon, which implements the steps of the method when executed by a processor.

[0040] A computer program product comprises a computer program / instructions which, when executed by a processor, implement the steps of the method.

[0041] Through the above solution, the following beneficial technical effects are achieved:

[0042] The present application provides an engine control method, system and electronic equipment, which first detects whether the vehicle is in a reverse towing condition. If so, it determines whether the vehicle meets a first preset condition based on the obtained engine operating information, and then triggers an economic reverse towing control strategy to control the vehicle to travel in the reverse towing condition. The advantage of this design is compared with the existing technology that only considers exhaust temperature management and catalyst protection or relies only on hardware lubrication to reduce friction loss. When the vehicle is in a reverse towing condition, it can dynamically adjust according to the actual operating state of the engine, so that the vehicle's energy consumption optimization is more in line with the real-time operating conditions, improves control accuracy, thereby reducing energy loss during reverse towing and improving the economy of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of an engine control method;

[0044] Figure 2 is a curve diagram showing the relationship between reverse drag torque and intake air pipe pressure;

[0045] Figure 3 The following is a comparison of the reverse drag torque characteristics with engine speed under different Miller cams, where the line of the large Miller cycle is above the line of the small Miller cycle;

[0046] Figure 4 FIG. 1 is a flow chart of an engine control method according to one embodiment. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application clearer, the following Figures 1-4 This application is further described in detail. Obviously, the embodiments described are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0049] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0050] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0051] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0052] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0053] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0054] The optional embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] Figure 1 An engine control method is shown, the method comprising the following steps:

[0056] S1: Detect whether the vehicle is in reverse towing condition;

[0057] S2: If the vehicle is in reverse towing mode, obtain the current engine operation information;

[0058] S3: determining whether the vehicle meets a first preset condition based on the engine operating information;

[0059] S4: If the vehicle meets the first preset condition, the economic reverse drag control strategy is triggered to control the vehicle's driving.

[0060] Specifically, the present application first determines whether the vehicle is in a reverse towing condition; when the vehicle is in a reverse towing condition, it further determines whether the vehicle meets the first preset condition, and then triggers the start of an economic reverse towing control strategy based on the judgment result, so that when the vehicle is traveling in a reverse towing condition, while ensuring the basic emissions of the engine, emissions will not deteriorate, and fatigue damage to the internal parts of the engine, resulting in a shortened service life, is also avoided. Through the economic reverse towing control strategy, the use functions of various components of the engine are coordinated, and without affecting the practical functions of the components, it can be dynamically adjusted according to the actual operating status of the engine, thereby achieving energy consumption improvement, thereby reducing energy loss during reverse towing and improving the economy of the entire vehicle.

[0061] Furthermore, the engine operation information includes at least: engine fuel circuit status, transmission shift status and engine braking status.

[0062] Furthermore, based on the engine operating information, determining whether the vehicle meets a first preset condition specifically includes:

[0063] Based on the engine's operating information, determine the engine's operating status;

[0064] When the operating state of the engine is a first state and the first state is maintained for a first preset time, it is determined that the vehicle meets the first preset condition;

[0065] The first state needs to simultaneously meet the following conditions: the engine fuel circuit state is a fuel cut-off state, the transmission shift state is a non-shift state, and the engine brake state is an inactive state.

[0066] Specifically, this embodiment further determines the engine's operating state and requires that the engine's operating state simultaneously meet the following conditions: the engine fuel circuit is in a cut-off state, the transmission is in a non-shifting state, and the engine brake is in an inactive state, and this operating state is maintained for a first preset time before the economic reverse drag control strategy is triggered. The purpose of this design is to accurately identify such conflicting scenarios through the superposition of multiple conditions, avoiding blindly triggering the strategy when the states are not fully matched, and further avoiding misjudgments or inaccurate judgments that lead to the subsequent incorrect execution of the economic reverse drag control strategy, which could affect driving safety or economy.

[0067] It can be understood that this design uses dual filtering methods of multiple conditions and time verification to ensure that the vehicle will only perform subsequent operations under stable and conflict-free working conditions, reducing problems such as power interruption and abnormal fuel consumption caused by misjudgment, and improving the reliability and safety of vehicle control.

[0068] In a specific embodiment, step S4: if the vehicle meets the first preset condition, triggering the economic reverse towing control strategy to control the vehicle to travel in an economic reverse towing manner, specifically includes:

[0069] Based on the constraint conditions, a target throttle opening value of the engine is set, and the throttle opening is controlled; wherein the constraint conditions include at least: emission constraint conditions and mechanical constraint conditions;

[0070] In response to the throttle opening state, obtaining a theoretical intake manifold intake pressure corresponding to a minimum reverse torque of the engine in a reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure; and

[0071] The second preset method is used to obtain the EGR valve opening value.

[0072] First, it should be noted that the intake volume is generally controlled through the throttle during reverse towing: 1. If the throttle is set to a small opening during reverse towing, the negative pressure in the cylinder will be large, making it easier for oil to be drawn into the cylinder, resulting in increased oil consumption. In addition, when the driver requests acceleration, the intake pressure will rise from its minimum value, and the transient acceleration response will be poor. 2. If the throttle is set to a large opening during reverse towing, the engine scavenging volume will increase, accelerating the catalyst cooling and worsening emissions. Excessive fresh air scavenging volume can also cause excessive cooling in the cylinder, and the thermal shock can cause thermal fatigue damage to the spark plugs, exhaust manifold, and cylinder head, shortening their lifespan. Therefore, in order to prevent excessive catalyst cooling from affecting emissions and improve engine reliability during reverse towing, the throttle opening is pre-set by setting emission and mechanical constraints. This avoids the situation where simply pursuing minimum reverse towing torque ignores emissions violations or mechanical damage.

[0073] Specifically, by employing the first preset method, the optimal intake pressure corresponding to the engine's minimum reverse torque during reverse towing is determined, thereby directly reducing engine drag during coasting, thereby increasing the vehicle's coasting distance and reducing energy consumption. Furthermore, by synchronously controlling the throttle and EGR valve, rather than adjusting either component independently, the vehicle can adapt to diverse and complex road conditions, providing greater flexibility.

[0074] Furthermore, in response to the throttle opening state, obtaining the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine in the reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure, specifically includes:

[0075] The engine bench test method is used to measure the engine reverse torque data at different intake pressures to form an intake manifold pressure-reverse torque mapping curve;

[0076] According to the intake manifold pressure-reverse drag torque mapping curve, the theoretical intake manifold intake pressure for the minimum reverse drag torque is obtained;

[0077] Set the theoretical intake manifold intake pressure to the optimal intake pressure.

[0078] It can be understood that the present application measures the reverse drag torque by controlling different intake pressures on the engine test bench, thereby obtaining an intake manifold pressure-reverse drag torque mapping curve. Figure 2 As shown in FIG, when the engine speed is 1200 rpm, the intake manifold pressure and reverse drag torque diagram is shown, and the intake pressure point with the minimum reverse drag torque is set as the optimal intake pressure; Figure 2 The middle vertical axis represents the reverse drag torque, and the horizontal axis represents the corresponding ratio of the standard intake pressure. In this embodiment, the standard intake pressure is 1 bar of atmospheric pressure.

[0079] Furthermore, the second preset method is used to obtain the EGR valve opening value, specifically including:

[0080] When the engine throttle opening meets the constraint conditions, the actual intake pressure of the intake manifold is collected in real time;

[0081] Taking the optimal intake pressure as the target, the EGR valve opening value is calculated according to the difference between the optimal intake pressure and the actual intake pressure (such as PID control algorithm).

[0082] The throttle valve opening constraint range in this embodiment is 5%-10%, that is, the throttle valve opening is between 5%-10%.

[0083] In this embodiment, the engine bench test method is used to ensure that the theoretical pressure point of the minimum reverse torque is highly matched with the actual working conditions, thereby improving the reliability of the control strategy at the source. Furthermore, when the vehicle is coasting, it avoids the situation where the actual intake pressure deviates from the optimal value due to engine load fluctuations caused by changes in road slope, or abnormal conditions such as air leakage in the intake system. The EGR opening is quickly corrected through real-time difference, and the intake pressure is stabilized in the target range, ensuring that the reverse torque is always close to the minimization target.

[0084] Furthermore, the present application further comprises the following steps:

[0085] When the engine throttle opening is within the constraint range, the engine intake valve delay mechanism is triggered;

[0086] Based on the engine intake valve delay mechanism, the VVA device is controlled to switch to the large Miller camshaft.

[0087] like Figure 3 and Figure 4 As shown, Figure 3The vertical axis is the reverse torque, and the horizontal axis is the engine speed. When the engine throttle opening is within the constraint range, for the two-stage VVA, according to the engine cam profile, the camshaft with a larger Miller degree is selected for switching. For the continuously variable camshaft, the valve overlap angle or the position with a larger lift is selected to delay the closing of the intake valve, so that part of the intake air is pushed back to the intake manifold at the beginning of the compression stroke, reducing the compressed working medium actually entering the combustion chamber.

[0088] It can be understood that through the Miller cycle principle, the pumping loss in the reverse towing condition is actively reduced, the reverse towing torque is directly reduced, and the sliding economy is improved; by using the throttle opening as a trigger condition, the low-load reverse towing scenario is accurately locked, and the energy saving and emission reduction effects are amplified through overall multi-dimensional collaborative optimization.

[0089] like Figure 4 As shown, the economic reverse drag control strategy also includes the following steps:

[0090] In response to the engine intake valve delay mechanism, according to the engine electronically controlled accessory energy saving strategy; wherein, the engine electronically controlled accessory energy saving strategy includes:

[0091] Based on the actual working requirements of the engine reverse towing condition, the engine electronically controlled accessories are controlled to operate according to their corresponding preset calibration values; the engine electronically controlled accessories include at least: an oil pump, a water pump, an air compressor and a fan; wherein, the actual working requirements include at least: safety use requirements and electronic control function requirements.

[0092] The safety requirements are used to ensure the necessary conditions for basic engine operation safety (such as the oil pump needs to maintain the minimum oil pressure while still maintaining a safe oil film thickness to prevent wear of mechanical parts; the water pump needs to ensure the minimum circulation of coolant to avoid overheating); the electronic control function requirements are used to meet the necessary conditions for the engine electronic control system functions (such as the air compressor needs to maintain the minimum air pressure of the braking system; the fan needs to adjust the minimum speed according to the real-time water temperature).

[0093] It can be understood that the preset calibration values ​​are obtained based on static bench tests; for electronically controlled accessories such as oil pumps, water pumps, air compressors, fans, etc., by pre-calibrating the safety and functional adaptation values ​​under different reverse towing conditions, the energy consumption of accessories can be reduced while meeting the needs, further reducing the overall energy consumption of the vehicle under reverse towing conditions and improving the economy of the entire vehicle.

[0094] Furthermore, the method further includes the following steps:

[0095] Real-time acquisition of vehicle external environment information and engine status information; wherein the environmental information includes at least altitude, ambient temperature and air humidity information; the engine status information includes at least engine oil temperature, water temperature and speed information;

[0096] Based on the vehicle's external environment information and engine status information, the preset calibration value is dynamically corrected through a predefined compensation model.

[0097] For example, the external altitude is 2000m, the ambient temperature is -5°C, and the air humidity is 20%; the engine oil temperature is 65°C, the water temperature is 70°C, and the speed is 1200 rpm. When a compensation model (such as the water pump water temperature and speed compensation model) is called, an altitude of 2000m corresponds to a 20% drop in air pressure. The model outputs a +20% compensation for the air compressor speed, correcting the preset calibration value of 1000 rpm to 1200 rpm. When the water temperature is 70°C, lower than the reference of 90°C, the model outputs a -10% compensation for the water pump speed, correcting the preset calibration value of 1200 rpm to 1080 rpm. The ECU sends the corrected speed command to the air compressor and water pump, allowing them to operate according to the adapted parameters. This design not only improves energy saving but also ensures operational safety under complex working conditions.

[0098] Furthermore, the present application also includes the following steps: when the engine throttle opening is within the constraint range, the pre-adjustment strategy of the engine electronic control accessories is immediately triggered, and the intake valve delay mechanism is started at the same time, so that the time point when the pre-adjustment of the engine electronic control accessories is completed is completely synchronized with the time point when the intake valve delay mechanism takes effect; thereby eliminating the action lag caused by the difference in response speed of the pre-adjustment strategy and the intake valve delay mechanism.

[0099] For example, when the throttle opening reaches 6% and falls within the range of 5%-15%, the ECU immediately triggers the accessory pre-adjustment strategy and starts the intake valve delay mechanism at the same time; for example, after 0.5s, the intake valve delay mechanism completes the switch, but has not entered the effective state, and the electronically controlled accessory is still in the process of deceleration; when the time is 1s, the electronically controlled accessory completes the deceleration, and the intake valve delay mechanism enters the effective state, and both work stably at the same time without lag.

[0100] In summary, under the economic reverse drag control strategy, this application sets the optimal intake pressure requirement, sets the current throttle opening, and controls the EGR valve opening according to the set intake pressure requirement to achieve closed-loop control of the intake pressure, which can reduce the pump suction loss by about 10%; under the economic reverse drag control strategy, the VVA solenoid valve is controlled to switch to the large Miller camshaft, which can reduce the compression power loss by about 7%, and controls the minimum set pressure of the electronic oil pump and the minimum set speed of the electronic water pump to reduce the accessory power consumption by 5%.

[0101] In another aspect, the present application provides an engine control system, comprising:

[0102] A detection module configured to detect whether the vehicle is in a reverse towing condition;

[0103] an acquisition module configured to acquire current engine operating information if the vehicle is in a reverse towing condition;

[0104] a judgment module configured to judge whether the vehicle meets a first preset condition based on the engine operation information;

[0105] The strategy module is configured to trigger an economic reverse drag control strategy to control vehicle driving if the vehicle meets a first preset condition.

[0106] It is worth noting that although the present system only discloses a detection module, an acquisition module, a judgment module and a strategy module, it does not mean that the present device is limited to the above-mentioned basic functional modules. Rather, what the present invention wants to express is that, based on the above-mentioned basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the existing technology to form an infinite number of embodiments or technical solutions. In other words, the present system is open rather than closed. Just because the present embodiment only discloses individual basic functional modules, it cannot be considered that the scope of protection of the claims of the present invention is limited to the above-mentioned basic functional modules.

[0107] On the other hand, the present application provides an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0108] A computer program is stored in the memory, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method.

[0109] On the other hand, the present application provides a computer-readable storage medium having a computer program / instruction stored thereon, which implements the steps of the method when the computer program / instruction is executed by a processor.

[0110] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0111] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program may be stored in a non-volatile computer-readable storage medium. When executed, the computer program may include the processes of the above-described method embodiments. Any reference to memory, database, or other media used in the embodiments provided herein may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRRAM), etc. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM may take various forms. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchain. The processors involved in the various embodiments provided in this application may be general-purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, data processing logic devices based on quantum computing, etc., but are not limited thereto.

[0112] The technical features of the above embodiments can 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.

[0113] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An engine control method, characterized in that: The method comprises the following steps: S1: Detect whether the vehicle is in reverse towing condition; S2: If the vehicle is in reverse towing mode, obtain the current engine operation information; S3: determining whether the vehicle meets a first preset condition based on the engine operating information; S4: If the vehicle meets the first preset condition, the economic reverse towing control strategy is triggered to control the vehicle to travel in an economic reverse towing manner.

2. The method according to claim 1, characterized in that The operating information includes at least: engine fuel circuit status, transmission shift status and engine braking status.

3. The method according to claim 2, characterized in that S3, specifically including: Based on the engine's operating information, determine the engine's operating status; When the operating state of the engine is a first state and the first state is maintained for a first preset time, it is determined that the vehicle meets the first preset condition; The first state needs to simultaneously meet the following conditions: the engine fuel circuit state is a fuel cut-off state, the transmission is a non-shifting state, and the engine brake state is an inactive state.

4. The method according to claim 3, characterized in that S4, specifically including: Based on the constraint conditions, a target throttle opening value of the engine is set, and the throttle opening is controlled; wherein the constraint conditions include at least: emission constraint conditions and mechanical constraint conditions; In response to the throttle opening state, obtaining a theoretical intake manifold intake pressure corresponding to a minimum reverse torque of the engine in a reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure; and The second preset method is used to obtain the EGR valve opening value.

5. The method according to claim 4, characterized in that The method of obtaining, in response to the throttle opening state, a theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine in the reverse drag state by a first preset method, and using the theoretical intake manifold intake pressure corresponding to the minimum reverse torque of the engine as the optimal intake pressure, specifically includes: The engine bench test method is used to measure the engine reverse torque data at different intake pressures to form an intake manifold pressure-reverse torque mapping curve; According to the intake manifold pressure-reverse drag torque mapping curve, the theoretical intake manifold intake pressure for minimum reverse drag torque is obtained; Set the theoretical intake manifold intake pressure to the optimal intake pressure.

6. The method according to claim 5, characterized in that The second preset method is used to obtain the EGR valve opening value, specifically including: When the engine throttle opening meets the constraint conditions, the actual intake pressure of the intake manifold is collected in real time; Taking the optimal intake pressure as the target, the EGR valve opening value is calculated according to the difference between the optimal intake pressure and the actual intake pressure.

7. The method according to claim 6, characterized in that The following steps are also included: When the engine throttle opening is within the constraint range, the engine intake valve delay mechanism is triggered; Based on the engine intake valve delay mechanism, the VVA device is controlled to switch to the large Miller camshaft.

8. The method according to claim 7, characterized in that The economic reverse drag control strategy also includes the following steps: In response to the engine intake valve delay mechanism, according to the engine electronically controlled accessory energy saving strategy; wherein, the engine electronically controlled accessory energy saving strategy includes: Based on the actual working requirements of the engine reverse towing condition, the engine electronically controlled accessories are controlled to operate according to their corresponding preset calibration values; the engine electronically controlled accessories include at least: an oil pump, a water pump, an air compressor and a fan; wherein, the actual working requirements include at least: safety use requirements and electronic control function requirements.

9. An engine control system, characterized in that: include: A detection module configured to detect whether the vehicle is in a reverse towing condition; an acquisition module configured to acquire current engine operating information if the vehicle is in a reverse towing condition; a judgment module configured to judge whether the vehicle meets a first preset condition based on the engine operation information; The strategy module is configured to trigger an economic reverse drag control strategy to control vehicle driving if the vehicle meets a first preset condition.

10. A computer device or an electronic device comprising: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; characterized in that a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method described in any one of claims 1 to 8.

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