Engine oil supply control method and apparatus, vehicle, storage medium and program

Abstract

The present invention relates to the technical field of vehicle control, in particular to an engine oil supply control method and apparatus, a vehicle, a storage medium and a program. The method comprises: measuring the environment temperature of a vehicle when the vehicle is in a downhill condition; if the environment temperature meets a preset low-temperature condition, calculating a temperature difference value between the temperature in a cab and the set temperature of an air conditioner in the case of fuel cut-off of an engine; and, on the basis of the temperature in the cab, the set temperature of the air conditioner and the temperature difference value, controlling the engine to recover oil supply or maintain fuel cut-off. The present invention solves the problems that when a vehicle runs in a hill shift mode under the conditions of low temperature and mountainous long downhill areas, a long-time fuel cut-off of an engine affects the comfort of heating and the driving safety for drivers and passengers in the vehicle; in addition, the fuel economy, the drivability, the braking safety of vehicles and the service life of braking devices can be guaranteed to the maximum extent while ensuring the overall vehicle performance of vehicles.

Description

Engine fuel supply control method, device, vehicle, storage medium and program

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410347719.6 and application date of March 26, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present invention relates to the field of vehicle control technology, and in particular to an engine fuel supply control method, device, vehicle, storage medium and program. Background Art

[0004] When driving downhill, a fuel vehicle equipped with an automatic transmission usually enters the hill shift mode, using a lower gear and relatively high engine speed to achieve auxiliary braking when the vehicle is driving downhill. This is beneficial to improving the braking safety of the vehicle when driving downhill and the service life of the braking device. At the same time, under this condition, due to the small engine torque and high speed, the engine will generally cut off the fuel, which is beneficial to the fuel economy of the entire vehicle.

[0005] However, when the vehicle is traveling in hill shift mode under low temperature and long downhill conditions in mountainous areas, although the hill shift mode is beneficial to the vehicle's braking safety and fuel economy, the prolonged engine fuel cut-off control will cause the engine water temperature to continue to drop. Under low temperature conditions, the driver and passengers in the vehicle generally close the windows and turn on the heater and glass defogger. The continuous drop in engine water temperature will cause the heater and glass defogger outlet temperatures in the cab to be low, which will easily cause water mist to form on the front windshield and the driver and co-driver windows, affecting the heating comfort and driving safety of the vehicle's drivers and passengers. In order to avoid the above-mentioned effects, the driver needs to brake to control the vehicle speed to a relatively low level or step on the accelerator to resume engine fuel supply, which cannot well guarantee the vehicle's fuel economy, drivability, braking safety and brake device service life. In addition, the driver and passengers generally do not understand the principles of vehicle glass fogging and engine fuel supply control, and it is even more difficult for them to make corresponding vehicle operation measures. Therefore, it is easy to cause confusion and complaints from users.

[0006] Summary of the Invention

[0007] The present invention provides an engine fuel supply control method, device, vehicle, storage medium and program to solve the problem that when a vehicle is driving in a hill shift mode under low temperature and long downhill conditions in mountainous areas, the heating comfort and driving safety of the vehicle occupants are affected by long-term engine fuel cut-off. At the same time, it can maximize the vehicle's fuel economy, drivability, braking safety and the service life of the braking device, taking into account the comprehensive performance of the vehicle.

[0008] A first aspect of an embodiment of the present invention provides an engine fuel supply control method, comprising the following steps: detecting the ambient temperature when the vehicle is in a downhill condition, wherein the downhill condition is that the slope of the long downhill road on which the vehicle is currently located is greater than or equal to a preset slope; if the ambient temperature meets a preset low temperature condition, calculating the temperature difference between the cab interior temperature and the air conditioning set temperature when the engine is cut off from fuel, wherein the preset low temperature condition is that the ambient temperature is lower than a preset temperature; controlling the engine to resume fuel supply or maintain fuel cut off according to the cab interior temperature, the air conditioning set temperature and the temperature difference.

[0009] Optionally, controlling the engine to resume fuel supply or maintain fuel cut-off based on the cab interior temperature, the air-conditioning set temperature and the temperature difference includes: if the cab interior temperature is lower than the air-conditioning set temperature and the temperature difference is greater than a first temperature threshold, controlling the engine to resume fuel supply; otherwise, controlling the engine to maintain fuel cut-off.

[0010] Optionally, before controlling the engine to resume fuel supply or maintain fuel cut-off based on the cabin temperature, the air-conditioning set temperature and the temperature difference, it also includes: obtaining the number of drivers and passengers in the vehicle; determining the first temperature threshold based on the number of drivers and passengers in the vehicle and the ambient temperature.

[0011] Optionally, before controlling the engine to maintain fuel cut-off, it also includes: obtaining the engine speed and the accelerator pedal opening; if the engine speed is higher than a first speed threshold and the accelerator pedal opening is less than a first opening threshold, controlling the engine to maintain fuel cut-off, otherwise controlling the engine to resume fuel supply.

[0012] Optionally, before calculating the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel, it also includes: obtaining the engine torque, engine speed, accelerator pedal opening, and the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is supplied with fuel; if the engine torque is less than the torque threshold and the engine speed is higher than the second speed threshold and the accelerator pedal opening is less than the second opening threshold and the absolute value of the temperature difference is less than the second temperature threshold, then the engine is controlled to cut off fuel, otherwise, the engine supply with fuel is maintained.

[0013] Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference between the first temperature threshold and the second temperature threshold is greater than a preset threshold.

[0014] A second aspect of the present invention provides an engine fuel supply control device, comprising: a detection module for detecting the ambient temperature when the vehicle is in a downhill condition, wherein the downhill condition is that the slope of the long downhill road on which the vehicle is currently located is greater than or equal to a preset slope; a calculation module for calculating the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel if the ambient temperature meets a preset low temperature condition, wherein the preset low temperature condition is that the ambient temperature is lower than a preset temperature; a control module for controlling the engine to resume fuel supply or maintain fuel cut-off according to the cab interior temperature, the air-conditioning set temperature and the temperature difference.

[0015] Optionally, the control module is further configured to: if the temperature in the cab is lower than the air-conditioning set temperature and the temperature difference is greater than a first temperature threshold, control the engine to resume fuel supply; otherwise, control the engine to maintain fuel cut-off.

[0016] Optionally, the method further includes: a first acquisition module, configured to acquire the number of passengers in the vehicle; and determine the first temperature threshold value according to the number of passengers in the vehicle and the ambient temperature.

[0017] Optionally, it also includes: a second acquisition module, used to obtain the engine speed and the accelerator pedal opening; if the engine speed is higher than the first speed threshold and the accelerator pedal opening is less than the first opening threshold, the engine is controlled to maintain fuel cut-off, otherwise the engine is controlled to resume fuel supply.

[0018] Optionally, it also includes: a third acquisition module, used to obtain the engine torque, engine speed, accelerator pedal opening and the temperature difference between the interior temperature of the cab and the air-conditioning set temperature under the condition of engine fuel supply; if the engine torque is less than the torque threshold and the engine speed is higher than the second speed threshold and the accelerator pedal opening is less than the second opening threshold and the absolute value of the temperature difference is less than the second temperature threshold, the engine is controlled to cut off fuel, otherwise, the engine fuel supply is maintained.

[0019] Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference between the first temperature threshold and the second temperature threshold is greater than a preset threshold.

[0020] A third aspect of the present invention provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the engine fuel supply control method as described in the above embodiment.

[0021] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the engine fuel supply control method as described in the above embodiment.

[0022] A fifth aspect of the present invention provides a computer program, which, when executed, is used to implement the engine fuel supply control method as described in the above embodiment.

[0023] Therefore, the present invention has at least the following beneficial effects:

[0024] The embodiment of the present invention can detect the current ambient temperature when the vehicle is in low temperature and is traveling in a long downhill mountainous area in a hill shift mode. If the current ambient temperature meets the set low temperature condition, the temperature difference between the cab temperature and the air-conditioning set temperature when the engine is cut off from fuel is calculated, and the engine is jointly controlled to resume fuel supply or maintain fuel cut-off based on the cab temperature, the air-conditioning set temperature and the temperature difference, so as to avoid the impact of long-term engine fuel cut-off on the heating comfort and driving safety of the vehicle occupants, while maximally ensuring the vehicle's fuel economy, drivability, braking safety and the service life of the braking device, while taking into account the comprehensive performance of the vehicle.

[0025] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] FIG1 is a flow chart of an engine fuel supply control method according to an embodiment of the present invention;

[0028] FIG2 is an exemplary diagram of an engine fuel supply control method taking into account comprehensive vehicle performance according to an embodiment of the present invention;

[0029] 3 is a flow chart of an engine fuel supply control method taking into account comprehensive vehicle performance according to an embodiment of the present invention;

[0030] FIG4 is a block diagram of an engine fuel supply control device according to an embodiment of the present invention;

[0031] FIG5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0033] When the vehicle is traveling in hill shift mode at low temperatures and on a long downhill slope in mountainous areas, although the hill shift mode is beneficial to the vehicle's braking safety and fuel economy, the prolonged engine fuel cut-off control will cause the engine water temperature to continue to drop. In low temperature conditions, the driver and passengers in the vehicle generally close the windows and turn on the heater and glass defogger. The continuous drop in engine water temperature will cause the heater and glass defogger outlet temperatures in the cab to be low, which can easily lead to the formation of water mist on the front windshield and the driver and co-driver windows, affecting the heating comfort and driving safety of the driver and passengers.

[0034] When the engine is in the fuel-cut-off state, since the engine's fuel supply resumption control mainly depends on the engine speed and the driver's operation of the accelerator pedal, the engine will generally resume fuel supply only when the engine speed is lower than the fuel supply resumption speed threshold or the driver steps on the accelerator, thereby increasing the temperature of the heater and glass defogger outlets.

[0035] However, when the vehicle is traveling in hill shift mode at low temperatures or on a long downhill slope in mountainous areas, unless the driver steps on the brakes to control the vehicle speed to a relatively low level or steps on the accelerator to resume fuel supply to the engine, under such conditions, according to normal driving habits, the probability of the engine speed falling below the threshold for resuming fuel supply or the driver stepping on the accelerator to resume fuel supply to the engine is relatively low. Even if the engine resumes fuel supply, when the vehicle continues to travel in hill shift mode at low temperatures or on a long downhill slope in mountainous areas, the engine will still be cut off from fuel for a long time, causing the engine water temperature to continue to drop, affecting the heating comfort and driving safety of the vehicle occupants.

[0036] In order to address the problem that when the above-mentioned vehicle is traveling in hill shift mode under low temperature and long downhill conditions in mountainous areas, the heating comfort and driving safety of the vehicle occupants are affected by the long period of engine fuel cut-off, the existing technology mainly addresses this problem by increasing the engine fuel resumption speed threshold when the heater is turned on or the glass defogger is turned on. However, this speed threshold cannot be much higher than the engine fuel resumption speed threshold when the heater and glass defogger are not turned on. Otherwise, the engine will easily resume fuel supply when the heater or glass defogger is turned on, which is not conducive to the vehicle's fuel economy.

[0037] Generally speaking, compared with the engine fuel resumption speed threshold when the heater and glass defogger are not turned on, the engine fuel resumption speed threshold when the heater and glass defogger are turned on is about 100 to 200 r / min higher. In addition, since the engine speed is generally higher when the vehicle is traveling in hill shift mode under long downhill conditions in mountainous areas, it is difficult to trigger the engine fuel resumption control because the engine speed is lower than the engine fuel resumption speed threshold when the heater or glass defogger is turned on. Therefore, the existing technology has poor effect on the above problem.

[0038] Therefore, the present invention provides an engine fuel supply control method, which aims to solve the problem that when a vehicle is driving in a hill shift mode under low temperature and long downhill conditions in mountainous areas, the heating comfort and driving safety of the vehicle drivers and passengers are affected due to the long-term oil cut-off of the engine. At the same time, it can maximize the vehicle's fuel economy, drivability, braking safety and the service life of the braking device, taking into account the comprehensive performance of the vehicle.

[0039] The following describes an engine fuel supply control method, device, vehicle, storage medium, and program according to an embodiment of the present invention with reference to the accompanying drawings. Specifically, FIG1 is a flow chart of an engine fuel supply control method according to an embodiment of the present invention.

[0040] As shown in FIG1 , the engine fuel supply control method includes the following steps:

[0041] In step S101 , the ambient temperature when the vehicle is in a downhill condition is detected, wherein the downhill condition is that the slope of the long downhill road on which the vehicle is currently located is greater than or equal to a preset slope.

[0042] Among them, the preset slope can be 6°, and the road slope value can be set according to actual needs, which is not specifically limited in the present invention.

[0043] It is understandable that the embodiment of the present invention can detect the ambient temperature when the vehicle is in a downhill condition through the vehicle's temperature sensor, so as to subsequently determine whether the ambient temperature meets the preset low temperature condition.

[0044] In step S102, if the ambient temperature meets the preset low temperature condition, the temperature difference between the cabin temperature and the air conditioning set temperature when the engine is cut off is calculated, wherein the preset low temperature condition is that the ambient temperature is lower than the preset temperature.

[0045] The preset temperature may be -5°C or -10°C, and may be set according to actual needs, which is not specifically limited in the present invention.

[0046] It can be understood that the embodiment of the present invention can calculate the temperature difference between the cab temperature and the air-conditioning set temperature when the engine is cut off from fuel in a low-temperature environment, thereby determining whether the current air-conditioning adjustment effect meets the temperature requirements of the driver and passengers, so as to facilitate the subsequent control of the engine to resume fuel supply or maintain fuel cut-off.

[0047] It should be noted that the temperature sensor used in the ATC (Automatic Temperature Control) system is located in the cab, generally near the driver's right leg, B-pillar or headrest, etc., and can monitor the air temperature at the corresponding position in the cab. When the temperature sensor used in the ATC system collects the current cab temperature, it sends it to the ATC system, and then the ATC system sends it to the ECU (Engine Control Unit) via the CAN (Controller Area Network) bus.

[0048] Specifically, the ATC system uses a temperature sensor to monitor the temperature inside the cab. Air , by comparing t Air With air conditioning set temperature t S Get the difference Δt between the two, specifically, Δt=t S -t Air .

[0049] Under normal circumstances, when the windows are closed and the temperature inside the cab is close to the equilibrium state, the absolute value of △t |△t| should be within the second temperature threshold t Thres Within, t Thres It is a positive value in °C. Its value comes from the ATC system calibration test results, generally 0 to 5 °C. If the air conditioner is turned on for a long time with the windows closed and |△t| still exceeds t Thres , it indicates that the air conditioning adjustment effect does not meet the temperature requirements of the driver and passengers; at the same time, t S and t Air The ATC system sends the data to the ECU via the CAN bus, and the ECU can calculate △t by itself.

[0050] In an embodiment of the present invention, before calculating the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel, it also includes: obtaining the engine torque, engine speed, accelerator pedal opening, and the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is supplied with fuel; if the engine torque is less than the torque threshold and the engine speed is higher than the second speed threshold and the accelerator pedal opening is less than the second opening threshold and the absolute value of the temperature difference is less than the second temperature threshold, then the engine is controlled to cut off fuel, otherwise, the engine fuel supply is maintained.

[0051] Among them, the torque threshold is the engine fuel cut-off torque threshold T T , which can be set according to the actual vehicle's fuel economy, drivability, and heating and defogging performance; the second speed threshold is the engine fuel cut-off speed threshold n T , can be determined by calibration based on the engine water temperature and vehicle gear position combined with the specific performance of the actual vehicle; the second opening threshold α Z The specific setting can be made according to the fuel economy, driving performance and heating and defogging performance of the actual vehicle. For example, it can be 2%, which is not specifically limited in the present invention. The second temperature threshold is the temperature difference threshold t when the engine is in the fuel supply state. Thres .

[0052] It can be understood that, in the embodiment of the present invention, when the engine is in normal fuel injection operation, if the engine torque is less than a torque threshold and the engine speed is higher than a second speed threshold and the accelerator pedal opening is less than the second opening threshold and the temperature difference between the cab temperature and the air-conditioning set temperature is less than a second temperature threshold, then the engine fuel supply is controlled to be cut off; otherwise, the engine fuel supply is maintained; in this way, the heating comfort and driving safety requirements of the vehicle drivers and passengers can be met, and the fuel economy, drivability, braking safety and service life of the braking device of the vehicle can be maximized, while taking into account the comprehensive performance of the vehicle.

[0053] Specifically, the engine is in a normal fuel injection operation state, when the engine torque T E Less than the fuel cut-off torque threshold T T、 And the engine speed n E Higher than the fuel cut-off speed threshold n T , and the accelerator pedal opening α is less than the second opening threshold α Z , and the ATC system uses a temperature sensor to monitor the cabin temperature t Air With air conditioning set temperature t S The difference △t is less than the second temperature threshold t Thres When the fuel is turned off, the ECU controls the engine to cut off the fuel; otherwise, the ECU controls the engine to maintain the normal fuel injection operation state, that is, the fuel is not cut off.

[0054] Among them, the fuel cut-off torque threshold T T It can be set according to the actual vehicle's fuel economy, drivability, and heating and demisting performance. T It can be combined with the specific performance of the actual vehicle according to the engine water temperature t E The vehicle gear position G is obtained by looking up the set MAP table. Taking a vehicle equipped with a 6-speed automatic transmission as an example, the fuel cut-off speed threshold n T As shown in Table 1, its value is positive and its unit is r / min.

[0055] Generally, the fuel cut-off speed threshold n TThe setting principle is: Under the same gear G, the engine water temperature t E The lower the gear G, the lower the corresponding fuel cut-off speed threshold n Tij (i=1,2,3……6;j=1,2,3……5) should be higher, so that the engine is not easily cut off from oil, which is conducive to increasing the engine water temperature t E , which is beneficial to the vehicle's fuel economy and emission performance. Accordingly, the engine water temperature t E The higher the n Tij (i=1,2,3……6;j=1,2,3……5) should be lower, so that the engine is easier to cut off the fuel, which is beneficial to the fuel economy of the vehicle; the same engine water temperature t E The lower the gear, the higher the n Tij (i=1,2,3……6;j=1,2,3……5) should be higher, so that the engine is not easily cut off from fuel, so as to ensure that the engine speed will not be dragged down or stalled during emergency braking. Accordingly, the higher the gear, the higher the n Tij (i=1,2,3……6;j=1,2,3……5) The lower the value, the easier it is for the engine to cut off fuel, which is beneficial to the fuel economy of the vehicle. T The specific settings can be made based on comprehensive consideration of the actual vehicle's power, fuel economy, drivability, braking safety and other performance.

[0056] Table 1 Fuel cut-off speed threshold MAP table

[0057] Specifically, when the engine water temperature is 30°C and the gear is 3, the corresponding fuel cut-off speed threshold is 1800r / min.

[0058] In step S103, the engine is controlled to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air conditioner set temperature and the temperature difference.

[0059] It can be understood that the embodiment of the present invention jointly controls the engine to resume fuel supply or maintain fuel cut-off based on the cabin temperature, air-conditioning set temperature and temperature difference, so as to avoid the engine being cut off from fuel for a long time affecting the heating comfort and driving safety of the vehicle drivers and passengers, while at the same time maximizing the vehicle's fuel economy, drivability, braking safety and service life of the braking device, taking into account the comprehensive performance of the vehicle.

[0060] It should be noted that the present invention also needs to combine the vehicle operating parameters to control the engine fuel cut-off and resumption of fuel supply. The vehicle operating parameters include but are not limited to the engine torque T E , engine speed n E , accelerator pedal opening α, engine water temperature t E , gear position G and number of passengers N, where the engine torque T ECalculated by ECU, engine speed n E The engine speed sensor is directly sent to the ECU, the accelerator pedal opening α is directly sent to the ECU, and the engine water temperature t E The engine water temperature sensor measures the temperature and sends it directly to the ECU. The gear position G is sent from the TCU (Transmission Control Unit) to the ECU via the CAN bus. The number of passengers N is measured by the human seat sensors in each seat and sent to the BCM (Body Control Module), which then sends it to the ECU via the CAN bus. The details are as follows:

[0061] In an embodiment of the present invention, before controlling the engine to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air-conditioning set temperature and the temperature difference, it also includes: obtaining the number of drivers and passengers in the vehicle; determining a first temperature threshold based on the number of drivers and passengers in the vehicle and the ambient temperature.

[0062] It can be understood that the embodiment of the present invention can determine the first temperature threshold value based on the number of drivers and passengers in the vehicle and the ambient temperature by looking up the table, ensuring that under the same number of drivers and passengers, the lower the ambient temperature, the lower the first temperature threshold value, and comprehensively considering the heating comfort of the actual vehicle drivers and passengers, the vehicle driving safety affected by fogging of windows, fuel economy, and drivability.

[0063] It should be noted that the first temperature threshold t B It can be obtained by looking up the set MAP table according to the ambient temperature and the number of passengers in the car, as shown in Table 2 below. Its value is a positive value in °C. The first temperature threshold t B The setting principle is: under the same number of passengers N, the ambient temperature t Ambient The lower the t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) should be smaller, so that the engine can easily resume fuel supply and increase the engine water temperature t as soon as possible. E , to meet the heating and defogging needs of the drivers and passengers, and to ensure the heating comfort and driving safety of the vehicle passengers. Accordingly, the ambient temperature t Ambient The higher the t Bjk (j=1,2,3……5;k=1,2,3……5) can be larger; for the same ambient temperature t Ambient The larger the number of passengers N is, the greater the Bjk (j=1, 2, 3...5; k=1, 2, 3...5) should be smaller, so that the engine can easily resume fuel supply and increase the engine water temperature t as soon as possible. E, meeting the heating and defogging needs of the drivers and passengers, ensuring the heating comfort and driving safety of the vehicle drivers and passengers. Accordingly, the smaller the number of drivers and passengers N, the greater the t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) can be larger. In the embodiment of the present invention, the first temperature threshold t B Above the second temperature threshold t Thres , and the difference between the two is greater than the preset threshold △t △ , t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) and a preset threshold Δt △ Specifically, it can be set based on comprehensive consideration of the heating comfort of the actual vehicle drivers and passengers, vehicle driving safety affected by window fogging, fuel economy, drivability and other performance.

[0064] Specifically, in combination with Table 2, when the acquired ambient temperature is -10°C and the number of drivers and passengers is 2, the corresponding first temperature threshold is selected as 7°C.

[0065] Table 2 First temperature threshold MAP table

[0066] In one embodiment of the present invention, the engine is controlled to resume fuel supply or maintain fuel cut-off according to the temperature in the cab, the air-conditioning set temperature and the temperature difference, including: if the temperature in the cab is lower than the air-conditioning set temperature and the temperature difference is greater than the first temperature threshold, the engine is controlled to resume fuel supply, otherwise the engine is controlled to maintain fuel cut-off.

[0067] In combination with the above, the second temperature threshold t Thres For example, it can be 5°C, and the preset threshold Δt △ For example, it can be 3°C, then the first temperature threshold t B For example, it is definitely higher than 8°C, the first temperature threshold t B and preset threshold △t △ Specifically, the setting can be made based on comprehensive consideration of the heating comfort of the actual vehicle occupants, the vehicle driving safety affected by window fogging, fuel economy, drivability and other performance, and the present invention does not make specific limitations.

[0068] It can be understood that if the embodiment of the present invention detects that the temperature in the cab is lower than the air-conditioning set temperature and the temperature difference is greater than the first temperature threshold, it indicates that the air-conditioning adjustment effect does not meet the temperature requirements of the driver and passengers at this time, and it is necessary to control the engine to resume fuel supply, so as to ensure that the air-conditioning adjustment effect meets the target temperature requirements and improves the user's driving experience; otherwise, it indicates that the air-conditioning adjustment effect meets the temperature requirements of the driver and passengers, that is, it meets the heating and demisting needs of the driver and passengers, and the engine will continue to maintain the fuel-off state to ensure the fuel economy of the vehicle.

[0069] Specifically, the ATC system uses a temperature sensor to monitor the cabin temperature t Air Lower than the air conditioner set temperature t S And the difference △t between the two is greater than the first temperature threshold t B When the fuel supply is restored, the ECU controls the engine to resume fuel supply; otherwise, the ECU controls the engine to maintain the fuel cut-off state.

[0070] In the embodiment of the present invention, the first temperature threshold is higher than the second temperature threshold, and the difference between the first temperature threshold and the second temperature threshold is greater than a preset threshold.

[0071] The preset threshold value may be 3° C., which may be set according to actual needs and is not specifically limited in the present invention.

[0072] Specifically, the first temperature threshold t in the embodiment of the present invention is B Should be higher than the second temperature threshold t Thres And the difference between the two should be greater than the preset threshold △t △ To avoid the ATC system using a temperature sensor to monitor the cabin temperature t Air The slight fluctuation in fuel pressure causes the engine to switch back and forth between fuel cut-off and fuel resumption control.

[0073] In an embodiment of the present invention, before controlling the engine to maintain fuel cut-off, it also includes: obtaining the engine speed and the accelerator pedal opening; if the engine speed is higher than the first speed threshold and the accelerator pedal opening is less than the first opening threshold, then controlling the engine to maintain fuel cut-off, otherwise controlling the engine to resume fuel supply.

[0074] It can be understood that the embodiment of the present invention controls the engine to maintain fuel cut-off when the engine speed is higher than the first speed threshold and the accelerator pedal opening is less than the first opening threshold, taking into account the performance of the actual vehicle, such as power, fuel economy, drivability and braking safety.

[0075] It should be noted that when the engine is in the fuel cut-off state, when the engine speed n E Lower than the first speed threshold, that is, the fuel supply speed threshold n R , or the accelerator pedal opening α is greater than the first opening threshold α T , or the cabin temperature t monitored by the ATC system using a temperature sensor Air Lower than the air conditioner set temperature t S And the difference △t between the two is greater than the first temperature threshold t B When the fuel supply is restored, the ECU controls the engine to resume fuel supply; otherwise, the ECU controls the engine to maintain the fuel cut-off state.

[0076] Among them, the fuel supply speed threshold n R is the fuel cut-off speed threshold n T Subtract the speed difference △n to get the speed difference △n, which can be obtained according to the engine water temperature tE The gear position G is obtained by looking up the set MAP table, as shown in Table 3 below. Its value is positive and the unit is r / min. R Setting principle and fuel cut-off speed threshold n T The setting principle is similar to that of ij (i=1,2,3……6;j=1,2,3……5) Different engine water temperatures t in Table 3 E It can be set to the same value as in gear position G, or it can be set based on comprehensive considerations of the actual vehicle's power, fuel economy, drivability, braking safety and other performance.

[0077] Table 3 Speed ​​difference MAP table

[0078] Specifically, if the current engine water temperature is -30°C, the gear is 2, the speed difference is 300 r / min, and the accelerator pedal opening α is greater than the first opening threshold α T Indicates that the driver has stepped on the accelerator pedal, the first opening threshold α T The setting may be made based on comprehensive consideration of the accelerator pedal characteristics, fuel economy, and drivability of the actual vehicle. For example, it may be set to 2%.

[0079] According to the engine fuel supply control method proposed in an embodiment of the present invention, when the vehicle is in a low temperature and is traveling in a hill shift mode on a long downhill slope in a mountainous area, the current ambient temperature is detected. If the current ambient temperature meets the set low temperature condition, the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel is calculated. Based on the cab interior temperature, the air-conditioning set temperature and the temperature difference, the engine is jointly controlled to resume fuel supply or maintain fuel cut-off, thereby avoiding the impact of long-term engine fuel cut-off on the heating comfort and driving safety of the vehicle occupants, while maximizing the vehicle's fuel economy, drivability, braking safety and service life of the braking device, taking into account the comprehensive performance of the vehicle.

[0080] The engine fuel supply control method of the present invention taking into account the comprehensive performance of the vehicle will be described in detail below with reference to FIG2 and FIG3 . The specific steps are as follows:

[0081] Step 1: Determine the temperature value;

[0082] The temperature inside the cab is monitored by the temperature sensor of the ATC system. Air With air conditioning set temperature t S The method for obtaining the temperature difference △t between the two is specifically:

[0083] Determine the ambient temperature t AmbientAnd the temperature inside the cab monitored by the temperature sensor of the ATC system Air With air conditioning set temperature t S The difference △t, where the ambient temperature t Ambient The ambient temperature is measured by the vehicle's ambient temperature sensor and sent to the ATC system, which then sends it to the ECU via the CAN bus.

[0084] The temperature sensor used in the ATC system is located in the cab, usually near the driver's right leg, B-pillar or headrest, etc., and can monitor the temperature inside the cab. Air , through t Air With air conditioning set temperature t S Get the difference Δt between the two, specifically, Δt=t S -t Air .

[0085] Under normal circumstances, when the windows are closed and the temperature inside the cab is close to the equilibrium state, the absolute value of △t |△t| should be within the second temperature threshold t Thres Within, t Thres It is a positive value in °C. Its value comes from the ATC calibration test results and is generally 0 to 5 °C. If the air conditioner is turned on for a long time with the windows closed and |△t| still exceeds t Thres , it indicates that the air conditioning adjustment effect does not meet the temperature requirements of the driver and passengers. S and t Air The ATC system sends the data to the ECU via the CAN bus, and the ECU can calculate △t by itself.

[0086] Step 2: Control the engine fuel cut-off and fuel resumption based on the determined temperature value and combined with the vehicle operating parameters.

[0087] Among them, the vehicle operating parameters include engine torque T E , engine speed n E , accelerator pedal opening α, engine water temperature t E , gear position G and number of passengers N, where the engine torque T E Calculated by ECU, engine speed n E The engine speed sensor is directly sent to the ECU, the accelerator pedal opening α is directly sent to the ECU, and the engine water temperature t E The temperature is measured by the engine water temperature sensor and sent directly to the ECU. The gear position G is sent from the TCU to the ECU via the CAN bus. The number of drivers and passengers N is measured by the human seating sensor in each seat of the vehicle and sent to the BCM, and then sent from the BCM to the ECU via the CAN bus.

[0088] 2.1、ECU calculates the temperature difference △t and engine torque T E , engine speed n E And a control method for controlling engine fuel cutoff by accelerator pedal opening α

[0089] When the vehicle is in normal fuel injection operation, when the engine torque T E Less than the fuel cut-off torque threshold T T、 And the engine speed n E Higher than the second speed threshold, that is, the fuel cut-off speed threshold n T , and the accelerator pedal opening α is less than the second opening threshold α Z , and the ATC system uses a temperature sensor to monitor the cabin temperature t Air With air conditioning set temperature t S The difference △t is less than the second temperature threshold t Thres When the fuel is turned off, the ECU controls the engine to cut off the fuel; otherwise, the ECU controls the engine to maintain the normal fuel injection operation state, that is, the fuel is not cut off.

[0090] 2.2 Fuel cut-off speed threshold n T Setting principles and setting methods

[0091] Fuel cut-off torque threshold T T It can be set according to the actual vehicle's fuel economy, drivability, and heating and demisting performance. T It can be combined with the specific performance of the actual vehicle according to the engine water temperature t E The vehicle gear position G is obtained by looking up the set MAP table. Taking a vehicle equipped with a 6-speed automatic transmission as an example, the fuel cut-off speed threshold n T As shown in Table 1, its value is positive and its unit is r / min.

[0092] Generally, the fuel cut-off speed threshold n T The setting principle is: Under the same gear G, the engine water temperature t E The lower the n Tij (i=1,2,3……6;j=1,2,3……5) should be higher, so that the engine is not easily cut off from oil, which is conducive to increasing the engine water temperature t E , which is beneficial to the vehicle's fuel economy and emission performance. Accordingly, the engine water temperature t E The higher the n Tij (i=1,2,3……6;j=1,2,3……5) should be lower, so that the engine is easier to cut off the fuel, which is beneficial to the fuel economy of the vehicle; the same engine water temperature t E The lower the gear, the higher the n Tij(i=1,2,3……6;j=1,2,3……5) should be higher, so that the engine is not easily cut off from fuel, so as to ensure that the engine speed will not be dragged down or stalled during emergency braking, and the vehicle's power. Accordingly, the higher the gear, the better. Tij (i=1,2,3……6;j=1,2,3……5) The lower the value, the easier it is for the engine to cut off fuel, which is beneficial to the fuel economy of the vehicle. T The specific settings can be made based on comprehensive consideration of the actual vehicle's power, fuel economy, drivability, braking safety and other performance.

[0093] Table 1 Fuel cut-off speed threshold MAP table

[0094] Specifically, when the engine water temperature is 30°C and the gear is 3, the corresponding fuel cut-off speed threshold is 1800r / min.

[0095] 2.3、ECU calculates the temperature difference △t and engine speed n E And a control method for controlling engine fuel resumption by controlling accelerator pedal opening α

[0096] When the engine is in the fuel cut-off state, when the engine speed n E Lower than the first speed threshold, that is, the fuel supply speed threshold n R , or the accelerator pedal opening α is greater than the first opening threshold α T , or the temperature inside the cab monitored by the ATC system using a temperature sensor Air Lower than the air conditioner set temperature t S And the difference △t between the two is greater than the first temperature threshold t B When the fuel supply is restored, the ECU controls the engine to resume fuel supply; otherwise, the ECU controls the engine to maintain the fuel cut-off state.

[0097] 2.4 Fuel cut-off speed threshold n T and the fuel supply recovery speed threshold n R Setting principle and method of speed difference △n

[0098] Resume fuel supply speed threshold n R is the fuel cut-off speed threshold n T Subtract the speed difference △n to get the speed difference △n, which can be obtained according to the engine water temperature t E The gear position G is obtained by looking up the set MAP table, as shown in Table 3 below. Its value is positive and the unit is r / min. R Setting principle and fuel cut-off speed threshold n T The setting principle is similar to that of ij(i=1,2,3……6;j=1,2,3……5) Different engine water temperatures t in Table 3 E It can be set to the same value as in gear position G, or it can be set based on comprehensive considerations of the actual vehicle's power, fuel economy, drivability, braking safety and other performance.

[0099] Table 3 Speed ​​difference MAP table

[0100] Specifically, if the current engine water temperature is -30°C and the gear is 2nd gear, the speed difference is 300r / min obtained by looking up the table.

[0101] 2.5. First opening threshold α T Setting principles and setting methods

[0102] The accelerator pedal opening α is greater than the first opening threshold α T Indicates that the driver has stepped on the accelerator pedal, the first opening threshold α T The setting may be made based on comprehensive consideration of the accelerator pedal characteristics, fuel economy, and drivability of the actual vehicle. For example, it may be set to 2%.

[0103] 2.6. First temperature threshold t B According to the ambient temperature t Ambient Principles and methods for setting the number of drivers and passengers N

[0104] The temperature inside the cab monitored by the temperature sensor of the ATC system is t Air Lower than the air conditioner set temperature t S And the difference △t between the two is greater than the first temperature threshold t B , indicating that the engine water temperature continues to drop to a low temperature due to the prolonged fuel cut-off. The air conditioning adjustment effect cannot meet the temperature requirements of the driver and passengers, that is, it cannot meet the heating and defogging needs of the driver and passengers. Therefore, it is necessary to control the engine to resume fuel supply and increase the engine water temperature t E , to meet the heating and demisting needs of drivers and passengers, and ensure the heating comfort and driving safety of vehicle drivers and passengers.

[0105] The first temperature threshold t B It can be obtained by looking up the set MAP table according to the ambient temperature and the number of passengers in the car, as shown in Table 2 below. Its value is a positive value in °C. The first temperature threshold t B The setting principle is: under the same number of passengers N, the ambient temperature t Ambient The lower the t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) should be smaller, so that the engine can easily resume fuel supply and increase the engine water temperature t as soon as possible. E, to meet the heating and defogging needs of the drivers and passengers, and to ensure the heating comfort and driving safety of the vehicle passengers. Accordingly, the ambient temperature t Ambient The higher the t Bjk (j=1,2,3……5;k=1,2,3……5) can be larger; for the same ambient temperature t Ambient The larger the number of passengers N is, the greater the Bjk (j=1, 2, 3...5; k=1, 2, 3...5) should be smaller, so that the engine can easily resume fuel supply and increase the engine water temperature t as soon as possible. E , meeting the heating and defogging needs of the drivers and passengers, ensuring the heating comfort and driving safety of the vehicle drivers and passengers. Accordingly, the smaller the number of drivers and passengers N, the greater the t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) can be larger, t Bjk (j=1, 2, 3...5; k=1, 2, 3...5) and a preset threshold Δt △ Specifically, it can be set based on comprehensive consideration of the heating comfort of the actual vehicle drivers and passengers, vehicle driving safety affected by window fogging, fuel economy, drivability and other performance.

[0106] Table 2 First temperature threshold MAP table

[0107] Specifically, in combination with Table 2 above, when the acquired ambient temperature is -10°C and the number of drivers and passengers is 2, the corresponding first temperature threshold is selected as 7°C.

[0108] 2.7, where the first temperature threshold t B Should be greater than the second temperature threshold t Thres And the difference between the two should be greater than the preset threshold △t △ To avoid the ATC system using a temperature sensor to monitor the cabin temperature t Air The slight fluctuation in fuel consumption causes the engine to switch back and forth between fuel cut-off and fuel resumption control, ensuring the vehicle's fuel economy and drivability.

[0109] In summary, the embodiments of the present invention have the following beneficial effects:

[0110] (1) The embodiment of the present invention incorporates the difference between the cabin temperature monitored by the ATC system using a temperature sensor and the air conditioner set temperature into the engine fuel cut-off and fuel resumption control conditions, and takes into account the ambient temperature and the number of drivers and passengers. This effectively solves the problem of the heating comfort and driving safety of the vehicle occupants being affected by the engine fuel cut-off for a long time when the vehicle is driving in a hill shift mode under low temperature and long downhill conditions in mountainous areas. At the same time, it can maximize the vehicle's fuel economy, drivability, braking safety, and the service life of the braking device, taking into account the overall performance of the vehicle.

[0111] (2) The embodiments of the present invention can effectively prevent the engine from cyclically switching between fuel cut-off and fuel resumption control, thereby ensuring the fuel economy and drivability of the vehicle while taking into account the overall performance of the vehicle;

[0112] (3) The embodiment of the present invention does not affect the vehicle's driving in the hill shift mode under low temperature or long downhill conditions in mountainous areas. The hill shift mode can still be used to achieve auxiliary braking of the vehicle under downhill conditions, which is beneficial to the braking safety of the vehicle when driving downhill and the service life of the braking device, and can take into account the comprehensive performance of the vehicle;

[0113] (4) The embodiment of the present invention only requires adjusting and improving the control logic related to the engine fuel cut-off control and fuel resumption control conditions in the ECU, without changing the vehicle hardware. It has a small workload, low cost, and is easy to implement. It is simple and practical and can be effectively applied in engineering practice.

[0114] Next, the engine fuel supply control device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0115] FIG4 is a block diagram of an engine fuel supply control device according to an embodiment of the present invention.

[0116] As shown in FIG4 , the engine fuel supply control device 10 includes: a detection module 100 , a calculation module 200 and a control module 300 .

[0117] Among them, the detection module 100 is used to detect the ambient temperature when the vehicle is in a downhill condition, wherein the downhill condition is that the slope of the long downhill road on which the vehicle is currently located is greater than or equal to the preset slope; the calculation module 200 is used to calculate the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel if the ambient temperature meets the preset low temperature condition, wherein the preset low temperature condition is that the ambient temperature is lower than the preset temperature; the control module 300 is used to control the engine to resume fuel supply or maintain fuel cut-off according to the cab interior temperature, the air-conditioning set temperature and the temperature difference.

[0118] In an embodiment of the present invention, the control module 300 is further configured to: if the cabin temperature is lower than the air conditioner set temperature and the temperature difference is greater than a first temperature threshold, control the engine to resume fuel supply; otherwise, control the engine to maintain fuel cut-off.

[0119] In an embodiment of the present invention, the method further includes: a first acquisition module for acquiring the number of passengers in the vehicle; and determining a first temperature threshold according to the number of passengers in the vehicle and the ambient temperature.

[0120] In an embodiment of the present invention, it also includes: a second acquisition module, used to obtain the engine speed and the accelerator pedal opening; if the engine speed is higher than the first speed threshold and the accelerator pedal opening is less than the first opening threshold, the engine is controlled to maintain fuel cut-off, otherwise the engine is controlled to resume fuel supply.

[0121] In an embodiment of the present invention, it also includes: a third acquisition module, used to obtain the engine torque, engine speed, accelerator pedal opening and the temperature difference between the cabin temperature and the air-conditioning set temperature under the condition of engine fuel supply; if the engine torque is less than the torque threshold and the engine speed is higher than the second speed threshold and the accelerator pedal opening is less than the second opening threshold and the absolute value of the temperature difference is less than the second temperature threshold, the engine fuel is controlled to be cut off; otherwise, the engine fuel supply is maintained.

[0122] Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference between the first temperature threshold and the second temperature threshold is greater than a preset threshold.

[0123] It should be noted that the aforementioned explanation of the embodiment of the engine fuel supply control method is also applicable to the engine fuel supply control device of this embodiment, and will not be repeated here.

[0124] According to the engine fuel supply control device proposed in an embodiment of the present invention, when the vehicle is in low temperature and is traveling in a hill shift mode on a long downhill slope in a mountainous area, the current ambient temperature is detected. If the current ambient temperature meets the set low temperature condition, the temperature difference between the cab interior temperature and the air-conditioning set temperature when the engine is cut off from fuel is calculated. Based on the cab interior temperature, the air-conditioning set temperature and the temperature difference, the engine is jointly controlled to resume fuel supply or maintain fuel cut-off, thereby avoiding long-term engine fuel cut-off affecting the heating comfort and driving safety of the vehicle occupants, while maximizing the vehicle's fuel economy, drivability, braking safety and service life of the braking device, taking into account the comprehensive performance of the vehicle.

[0125] FIG5 is a schematic diagram of the structure of a vehicle provided by an embodiment of the present invention. The vehicle may include:

[0126] Memory 501 , processor 502 , and computer programs stored in the memory 501 and executable on the processor 502 .

[0127] When the processor 502 executes the program, the engine fuel supply control method provided in the above embodiment is implemented.

[0128] Furthermore, the vehicle further comprises:

[0129] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0130] The memory 501 is used to store computer programs that can be run on the processor 502 .

[0131] The memory 501 may include a high-speed RAM (Random Access Memory), or may include a non-volatile memory, such as at least one disk memory.

[0132] If the memory 501, processor 502, and communication interface 503 are implemented independently, the communication interface 503, memory 501, and processor 502 can be interconnected via a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus. Buses can be divided into address buses, data buses, control buses, etc. For ease of illustration, FIG5 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0133] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0134] The processor 502 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0135] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned engine fuel supply control method when executed by a processor.

[0136] An embodiment of the present invention further provides a computer program, which, when executed, is used to implement the engine fuel supply control method of the above embodiment.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0138] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0139] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or N executable instructions for implementing a custom logical function or step of a process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0140] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having logic gate circuits for implementing logical functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0141] Those skilled in the art will appreciate that all or part of the steps in the method of the above-mentioned embodiment can be accomplished by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0142] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for controlling engine fuel supply, characterized in that: The following steps are involved: Detect the ambient temperature when the vehicle is in downhill condition; If the ambient temperature meets the preset low temperature condition, the temperature difference between the cabin temperature and the air conditioner set temperature when the engine is cut off is calculated; The engine is controlled to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air conditioner set temperature and the temperature difference.

2. The engine fuel supply control method according to claim 1, characterized in that: The controlling the engine to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air conditioner set temperature, and the temperature difference includes: If the temperature in the cab is lower than the air-conditioning set temperature and the temperature difference is greater than a first temperature threshold, the engine is controlled to resume fuel supply; otherwise, the engine is controlled to maintain fuel cut-off.

3. The engine fuel supply control method according to claim 2, characterized in that: Before controlling the engine to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air conditioner set temperature, and the temperature difference, the method further includes: Get the number of passengers in the car; The first temperature threshold is determined according to the number of occupants in the vehicle and the ambient temperature.

4. The engine fuel supply control method according to claim 2, characterized in that: Before controlling the engine to maintain fuel cut-off, the method further includes: Get engine speed and accelerator pedal opening; If the engine speed is higher than a first speed threshold and the accelerator pedal opening is less than a first opening threshold, the engine is controlled to maintain fuel cutoff; otherwise, the engine is controlled to resume fuel supply.

5. The engine fuel supply control method according to claim 2, characterized in that: Before calculating the temperature difference between the cab interior temperature and the air conditioning set temperature when the engine is fuel-off, the following is also included: Obtaining the engine torque, engine speed, accelerator pedal opening, and the temperature difference between the cabin temperature and the air conditioner set temperature under the condition of the engine being fueled; If the engine torque is less than a torque threshold, the engine speed is higher than a second speed threshold, the accelerator pedal opening is less than a second opening threshold, and the absolute value of the temperature difference is less than a second temperature threshold, the engine is controlled to cut off fuel supply; otherwise, the engine fuel supply is maintained.

6. The engine fuel supply control method according to claim 5, characterized in that: The first temperature threshold is higher than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is greater than a preset threshold.

7. An engine fuel supply control device, characterized in that: include: The detection module is used to detect the ambient temperature when the vehicle is in a downhill condition, wherein the downhill condition is when the vehicle The slope of the long downhill road in front of the vehicle is greater than or equal to the preset slope; a calculation module, configured to calculate a temperature difference between the cabin temperature and the air conditioning set temperature when the engine is cut off from fuel if the ambient temperature satisfies a preset low temperature condition, wherein the preset low temperature condition is that the ambient temperature is lower than a preset temperature; A control module is used to control the engine to resume fuel supply or maintain fuel cut-off according to the cabin temperature, the air conditioner set temperature and the temperature difference.

8. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the engine fuel supply control method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the engine fuel supply control method according to any one of claims 1 to 6.

10. A computer program, characterized in that When the computer program is executed, it is used to implement the engine fuel supply control method according to any one of claims 1 to 6.

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