CN117948210A - Engine oil supply control method, engine oil supply control device, vehicle, storage medium, and program - Google Patents
Engine oil supply control method, engine oil supply control device, vehicle, storage medium, and program Download PDFInfo
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Abstract
The invention relates to the technical field of vehicle control, in particular to an engine oil supply control method, an engine oil supply control device, a vehicle, a storage medium and a program, wherein the method comprises the following steps: detecting the ambient temperature of the vehicle under a downhill working condition; if the ambient temperature meets the preset low-temperature condition, calculating a temperature difference value between the temperature in the cab and the set temperature of the air conditioner under the condition of fuel cut of the engine; and controlling the engine to recover oil supply or maintain oil interruption according to the temperature in the cab, the set temperature of the air conditioner and the temperature difference value. Therefore, the problem that the heating comfort and the running safety of a vehicle driver and passengers are influenced due to long-time fuel cut-off of an engine when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in mountain areas is solved, and meanwhile, the fuel economy, the driving performance, the braking safety and the service life of a braking device of the vehicle can be guaranteed to the greatest extent, and the comprehensive performance of the vehicle is considered.
Description
Technical Field
The present invention relates to the field of vehicle control technology, and in particular, to an engine fuel supply control method, an engine fuel supply control device, a vehicle, a storage medium, and a program.
Background
Under the downhill working condition, the fuel vehicle with the automatic transmission usually enters a slope gear shifting mode, auxiliary braking is realized when the vehicle descends by using a lower gear and a relatively higher engine speed, the braking safety and the service life of a braking device are improved when the vehicle descends, and meanwhile, under the working condition, the engine generally performs fuel cut-off control due to smaller engine torque and higher rotating speed, so that the fuel economy of the whole vehicle is facilitated.
However, when the vehicle runs in the slope gear shifting mode under the low-temperature and mountain long downhill working condition, although the slope gear shifting mode is beneficial to the braking safety and the fuel economy of the vehicle, the engine water temperature continuously drops due to long-time engine oil-cut control, and under the low-temperature working condition, a driver in the vehicle generally closes a window and opens warm air and glass defogging, the temperature of the air outlet of the warm air and the glass defogging in the cab is lower due to the continuous drop of the engine water temperature, and further, water mist is easily formed on the front windshield glass and the glass of a main and auxiliary driver seat, so that the heating comfort and the running safety of the driver of the vehicle are influenced, and in order to avoid the influence, the driver is required to step on the brake to control the vehicle speed to be relatively low or step on the accelerator, so that the engine is restored to be supplied with oil, the fuel economy, the driving performance, the braking safety and the service life of the braking device of the vehicle are not well ensured, and the driver generally does not know the principles of the vehicle glass fogging and the engine oil supply control, and the corresponding vehicle operation lifting is more difficult, so that the driver is easy to cause confusion and complaints of users.
Disclosure of Invention
The invention provides an engine oil supply control method, an engine oil supply control device, an engine oil supply control vehicle, a storage medium and a program, which are used for solving the problem that the heating comfort and the running safety of a vehicle driver are influenced by long-time oil interruption of the engine when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in a mountain area, and simultaneously guaranteeing the fuel economy, the drivability, the braking safety and the service life of a braking device of the vehicle to the greatest extent and considering the comprehensive performance of the vehicle.
An embodiment of a first aspect of the present invention provides an engine oil supply control method, including the steps of: detecting the environment temperature of the vehicle under a downhill working condition, wherein the downhill working condition is that the gradient of a long downhill road where the vehicle is currently positioned is larger than or equal to a preset gradient; if the environmental temperature meets the preset low-temperature condition, calculating a temperature difference value between the temperature in the cab and the set temperature of the air conditioner under the condition that the engine is in a fuel cut state, wherein the preset low-temperature condition is that the environmental temperature is lower than the preset temperature; and controlling the engine to recover oil supply or maintain oil interruption according to the temperature in the cab, the set temperature of the air conditioner and the temperature difference value.
Optionally, the controlling the engine to resume fuel supply or maintain fuel cut according to the temperature in the cab, the air conditioner set temperature and the temperature difference value includes: and if the temperature in the cab is lower than the set temperature of the air conditioner and the temperature difference is greater than a first temperature threshold, controlling the engine to recover oil supply, otherwise, controlling the engine to maintain oil cut.
Optionally, before controlling the engine to resume fuel supply or maintain fuel cut according to the temperature in the cab, the air conditioner set temperature and the temperature difference value, the method further comprises: obtaining the number of drivers and passengers in the vehicle; and determining the first temperature threshold according to the number of passengers in the vehicle and the environmental temperature.
Optionally, before controlling the engine to maintain fuel cut, the method further comprises: acquiring the rotation speed of an engine and the opening degree of an accelerator pedal; and if the engine speed is higher than a first speed threshold and the opening of the accelerator pedal is smaller than a first opening threshold, controlling the engine to maintain fuel cut, otherwise, controlling the engine to recover fuel supply.
Optionally, before calculating the temperature difference between the temperature in the cab and the air conditioner set temperature in the event of engine fuel cut, the method further comprises: acquiring the engine torque, the engine rotating speed, the accelerator pedal opening and the temperature difference between the temperature in a cab and the set temperature of an air conditioner under the condition of engine oil supply; and if the engine torque is smaller than a torque threshold, the engine rotating speed is higher than a second rotating speed threshold, the accelerator pedal opening is smaller than a second opening threshold, and the absolute value of the temperature difference is smaller than a second temperature threshold, controlling the engine to cut off oil, otherwise, maintaining the engine to supply oil.
Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference value of the first temperature threshold and the second temperature threshold is greater than a preset threshold.
An embodiment of a second aspect of the present invention provides an engine oil supply control apparatus including: the detection module is used for detecting the environment temperature when the vehicle is in a downhill working condition, wherein the downhill working condition is that the gradient of a long downhill road where the vehicle is currently located is larger than or equal to a preset gradient; the calculating module is used for calculating the temperature difference between the temperature in the cab and the set temperature of the air conditioner under the condition of engine oil failure if the environment temperature meets the preset low temperature condition, wherein the preset low temperature condition is that the environment temperature is lower than the preset temperature; and the control module is used for controlling the engine to recover oil supply or maintain oil interruption according to the temperature in the cab, the set temperature of the air conditioner and the temperature difference value.
Optionally, the control module is further configured to: and if the temperature in the cab is lower than the set temperature of the air conditioner and the temperature difference is greater than a first temperature threshold, controlling the engine to recover oil supply, otherwise, controlling the engine to maintain oil cut.
Optionally, the method further comprises: the first acquisition module is used for acquiring the number of drivers and passengers in the vehicle; and determining the first temperature threshold according to the number of passengers in the vehicle and the environmental temperature.
Optionally, the method further comprises: the second acquisition module is used for acquiring the engine rotating speed and the accelerator pedal opening; and if the engine speed is higher than a first speed threshold and the opening of the accelerator pedal is smaller than a first opening threshold, controlling the engine to maintain fuel cut, otherwise, controlling the engine to recover fuel supply.
Optionally, the method further comprises: the third acquisition module is used for acquiring the engine torque, the engine rotating speed, the accelerator pedal opening and the temperature difference value between the temperature in the cab and the air conditioner set temperature under the condition of engine oil supply; and if the engine torque is smaller than a torque threshold, the engine rotating speed is higher than a second rotating speed threshold, the accelerator pedal opening is smaller than a second opening threshold, and the absolute value of the temperature difference is smaller than a second temperature threshold, controlling the engine to cut off oil, otherwise, maintaining the engine to supply oil.
Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference value of the first temperature threshold and the second temperature threshold is greater than a preset threshold.
An embodiment of a third aspect of the present invention provides a vehicle including: the engine oil supply control system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the engine oil supply control method according to the embodiment.
An embodiment of a fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor for implementing the engine oil supply control method as described in the above embodiment.
An embodiment of a fifth aspect of the present invention provides a computer program which, when executed, is adapted to implement the engine oil supply control method of the above-described embodiment.
Therefore, the invention has at least the following beneficial effects:
The embodiment of the invention can detect the current environmental temperature when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in mountain areas, if the current environmental temperature meets the set low temperature condition, the temperature difference between the temperature in the cab and the set temperature of the air conditioner under the condition of fuel cut of the engine is calculated, and the engine is controlled to recover fuel supply or maintain fuel cut based on the temperature in the cab, the set temperature of the air conditioner and the temperature difference together, so that the long-time fuel cut of the engine is prevented from influencing the heating comfort and running safety of a vehicle driver and passengers, the fuel economy, the drivability, the braking safety and the service life of a braking device of the vehicle can be guaranteed to the maximum extent, and the comprehensive performance of the vehicle is considered.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of an engine oil supply control method provided according to an embodiment of the present invention;
FIG. 2 is an exemplary diagram of an engine fueling control method that is compatible with vehicle performance in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart of an engine fueling control method that is compatible with vehicle performance according to an embodiment of the present disclosure;
Fig. 4 is a block diagram of an engine oil supply control device provided according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
When the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in mountain areas, although the slope gear shifting mode is favorable for braking safety and fuel economy of the vehicle, long-time engine oil-cut control can lead to continuous reduction of the water temperature of the engine, under the working conditions of low temperature, passengers in the vehicle generally close windows and open warm air and glass for defogging, continuous reduction of the water temperature of the engine can lead to lower temperatures of the warm air and the glass defogging air outlet in a cab, and further water mist is easily formed on front windshield glass and glass of a main driver and a co-driver, so that heating comfort and running safety of the passengers are affected.
In the engine fuel cut-off state, because the engine oil recovery and supply control mainly depends on the engine speed and the operation of an accelerator pedal by a driver, the engine generally recovers oil supply only when the engine speed is lower than a threshold value of the oil recovery and supply speed or the driver steps on the accelerator, and the temperature of warm air and a glass defogging air outlet is increased.
However, when the vehicle runs in a slope gear shifting mode under the low-temperature and mountain long downhill working conditions, unless a driver steps on a brake to control the vehicle speed to be relatively low or steps on an accelerator to enable the engine to recover oil supply, under the working conditions, according to the normal driving habit, the engine speed is lower than the oil supply recovery speed threshold value or the driver steps on the accelerator to enable the engine to recover oil supply to be relatively low, and even if the engine recovers oil supply, when the vehicle continues to run in the slope gear shifting mode under the low-temperature and mountain long downhill working conditions, the problem that the engine is cut off for a long time to enable the engine water temperature to continuously drop can occur, so that the heating comfort and the running safety of a vehicle driver and passengers are affected.
Aiming at the problems that when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in mountain areas, the heating comfort and running safety of vehicle drivers and passengers are affected by long-time fuel cut-off of an engine, the problem in the prior art is mainly solved by lifting the engine oil recovery and supply rotating speed threshold when warm air or glass defogging is started, but the rotating speed threshold cannot be higher than the engine oil recovery and supply rotating speed threshold when the warm air and glass defogging is not started, otherwise, the engine is easy to recover oil supply when the warm air or glass defogging is started, and the fuel economy of the vehicle is not facilitated.
Generally, compared with the engine oil recovery and supply rotation speed threshold when warm air and glass defogging are not started, the engine oil recovery and supply rotation speed threshold when the warm air and glass defogging are started is about 100-200 r/min higher, and because the engine rotation speed when the vehicle runs in a slope gear shifting mode under the long downhill working condition of a mountain area is generally higher, the engine oil recovery and supply control caused by that the engine rotation speed is lower than the engine oil recovery and supply rotation speed threshold when the warm air or the glass defogging is started is difficult to trigger, so that the effect of the prior art on the problems is poor.
Therefore, the invention provides an engine oil supply control method, which aims to solve the problem that the heating comfort and the running safety of a vehicle driver are affected by long-time oil interruption of an engine when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in a mountain area, and can also furthest ensure the fuel economy, the driving performance, the braking safety and the service life of a braking device of the vehicle and give consideration to the comprehensive performance of the vehicle.
An engine oil supply control method, apparatus, vehicle, storage medium, and program of an embodiment of the present invention are described below with reference to the accompanying drawings. Specifically, fig. 1 is a schematic flow chart of an engine oil supply control method according to an embodiment of the present invention.
As shown in fig. 1, the engine oil supply control method includes the steps of:
In step S101, an ambient temperature of the vehicle under a downhill condition is detected, where the downhill condition is that a gradient of a long downhill road on which the vehicle is currently located is greater than or equal to a preset gradient.
The preset gradient may be 6 degrees, and the road gradient value may be set according to actual requirements, which is not particularly limited in the present invention.
It can be appreciated that the embodiment of the invention can detect the ambient temperature of the vehicle in the downhill working condition through the temperature sensor of the vehicle, so as to conveniently judge whether the ambient temperature meets the preset low temperature condition or not.
In step S102, if the ambient temperature satisfies a preset low temperature condition, a temperature difference between the temperature in the cab and the air conditioner set temperature under the condition of engine fuel cut is calculated, wherein the preset low temperature condition is that the ambient temperature is lower than the preset temperature.
The preset temperature may be-5 ℃ or-10 ℃, and may be set according to actual requirements, and the present invention is not particularly limited.
It can be understood that the embodiment of the invention can calculate the temperature difference between the temperature in the cab and the set temperature of the air conditioner under the condition of fuel cut of the engine in a low-temperature environment, so as to determine whether the current air conditioner adjusting effect meets the temperature requirement of drivers and passengers, thereby facilitating the follow-up control of the engine to recover fuel supply or maintain fuel cut.
The temperature sensor for the ATC (Automatic Temperature Control, automatic temperature control of air conditioner) system is located in the cab, may be located near the right leg of the driver, in the position of the B-pillar or the headrest, etc., and CAN monitor the air temperature at the corresponding position in the cab, and when the temperature sensor for the ATC system collects the current temperature in the cab, the temperature sensor for the ATC system sends the current temperature to the ATC system, and then the temperature sensor for the ATC system sends the current temperature to the ECU (Engine Control Unit ) through the CAN (Controller Area Network, controller area network) bus.
Specifically, the cabin interior temperature t Air is monitored by the ATC system temperature sensor, and the difference Δt between t Air and the air conditioner set temperature t S is obtained by comparing the two, specifically Δt=t S-tAir.
Under normal conditions, when the vehicle window is closed and the temperature in the cab is regulated to approach a balanced state, the absolute value of Deltat delta t is within a second temperature threshold t Thres, t Thres is a positive value, the unit is the temperature, the value is from an ATC system calibration test result, generally 0-5 ℃, and if the absolute value of Deltat delta t is still more than t Thres after the air conditioner is opened for a long time in the vehicle window closing state, the air conditioner regulating effect is indicated to not meet the temperature requirement of drivers; simultaneously, t S and t Air are sent to the ECU through the CAN bus by the ATC system, and the ECU CAN calculate delta t by itself.
In the embodiment of the invention, before calculating the temperature difference between the temperature in the cab and the set temperature of the air conditioner under the condition of engine fuel cut, the method further comprises the following steps: acquiring an engine torque, an engine rotating speed, an accelerator pedal opening and a temperature difference value between a temperature in a cab and a set temperature of an air conditioner under the condition of engine oil supply; and if the engine torque is smaller than the torque threshold value, the engine speed is higher than the second speed threshold value, the opening of the accelerator pedal is smaller than the second opening threshold value, and the absolute value of the temperature difference is smaller than the second temperature threshold value, controlling the engine to cut off fuel, otherwise, maintaining the engine to supply fuel.
The torque threshold is an engine fuel-cut torque threshold T T, and can be specifically set according to the actual vehicle fuel economy, drivability and heating defogging performance; the second rotating speed threshold is an engine oil-break rotating speed threshold n T, and can be determined through calibration according to the water temperature of the engine and the specific performance of the vehicle combined with the actual vehicle; the second opening threshold α Z may be specifically set according to the fuel economy, drivability, and heating defogging performance of the real vehicle, and may be 2% by way of example, and the present invention is not limited in detail; the second temperature threshold is a temperature difference threshold t Thres at which the engine is in an fuelling state.
It can be understood that in the embodiment of the invention, when the engine is in the normal oil injection running state, if the engine torque is smaller than the torque threshold and the engine speed is higher than the second speed threshold, the opening of the accelerator pedal is smaller than the second opening threshold and the temperature difference between the temperature in the cab and the set temperature of the air conditioner is smaller than the second temperature threshold, the engine is controlled to cut off oil, otherwise, the engine is maintained to supply oil; therefore, the heating comfort and running safety requirements of vehicle drivers and passengers can be met, the fuel economy, the driving performance, the braking safety and the service life of the braking device of the vehicle can be guaranteed to the greatest extent, and the comprehensive performance of the vehicle is considered.
Specifically, the engine is in a normal fuel injection operation state, when the engine torque T E is smaller than the fuel cut torque threshold T T、, the engine rotation speed n E is higher than the fuel cut rotation speed threshold n T, the accelerator pedal opening alpha is smaller than the second opening threshold alpha Z, and the difference Δt between the temperature T Air in the cab monitored by the ATC system with the temperature sensor and the air conditioner set temperature T S is smaller than the second temperature threshold T Thres, the ECU controls the engine to cut off fuel, otherwise, the ECU controls the engine to maintain the normal fuel injection operation state, that is, to continue fuel cut off.
The fuel cut-off torque threshold T T can be specifically set according to the fuel economy, drivability and heating defogging performance of the real vehicle. The fuel cut-off rotating speed threshold n T can be obtained by looking up a table according to the engine water temperature t E and the vehicle gear G through a set MAP table in combination with the concrete performance of the real vehicle, and takes the vehicle with the 6-gear automatic transmission as an example, the fuel cut-off rotating speed threshold n T is shown in a table 1, and the value of the fuel cut-off rotating speed threshold n T is a positive value, and the unit is r/min.
In general, the setting principle of the fuel cut-off rotation speed threshold n T is as follows: under the same gear G, the lower the engine water temperature t E is, the lower the gear G is, the higher the corresponding fuel cut-off rotation speed threshold value n Tij (i=1, 2, … … 6;j =1, 2,3 … … 5) is, so that the engine is not easy to cut off fuel, the engine water temperature t E is improved, the fuel economy and emission performance of a vehicle are facilitated, and correspondingly, the higher the engine water temperature t E is, the lower the corresponding fuel cut-off rotation speed threshold value n Tij (i=1, 2,3 … … 6;j =1, 2,3 … … 5) is, so that the engine is easy to cut off fuel, and the fuel economy of the vehicle is facilitated; the lower the water temperature t E of the same engine, the higher the gear is, the higher the n Tij (i=1, 2,3 … … 6;j =1, 2,3 … …) is, so that the engine is not easy to cut off oil, the engine rotating speed is not dragged down or flameout in emergency braking is guaranteed, and correspondingly, the higher the gear is, the lower the n Tij (i=1, 2,3 … … 6;j =1, 2,3 … …) is, so that the engine is easy to cut off oil, and the fuel economy of a vehicle is facilitated. The fuel cut-off rotation speed threshold n T can be set according to comprehensive consideration of the performance of the real vehicle such as dynamic performance, fuel economy, drivability and braking safety.
TABLE 1 oil cut-off speed threshold MAP table
Specifically, when the water temperature of the engine is 30 ℃, the gear is 3, and the corresponding oil-breaking rotation speed threshold is 1800r/min.
In step S103, the engine is controlled to resume fuel supply or maintain fuel cut according to the temperature in the cabin, the air conditioner set temperature, and the temperature difference.
It can be understood that the embodiment of the invention controls the engine to recover oil supply or maintain oil cut-off based on the temperature in the cab, the set temperature of the air conditioner and the temperature difference value, thereby avoiding that the long-time oil cut-off of the engine affects the heating comfort and the driving safety of a vehicle driver and passengers, and simultaneously guaranteeing the fuel economy, the driving performance, the braking safety and the service life of the braking device of the vehicle to the greatest extent and taking the comprehensive performance of the vehicle into consideration.
It should be noted that, the present invention also needs to control engine fuel cut and oil recovery in combination with vehicle operation parameters, including, but not limited to, engine torque T E, engine speed N E, accelerator pedal opening α, engine water temperature T E, gear G, and number of occupants N, where engine torque T E is calculated by ECU, engine speed N E is directly sent to ECU by engine speed sensor, accelerator pedal opening α is directly sent to ECU by accelerator pedal opening sensor, engine water temperature T E is directly sent to ECU by engine water temperature sensor, gear G is sent to ECU by TCU (Transmission Control Unit, automatic transmission control unit) through CAN bus, number of occupants N is sent to BCM (Body Control Module ) by human body sitting sensor in each seat of vehicle, and then sent to ECU by BCM through CAN bus, concretely as follows:
In an embodiment of the present invention, before controlling the engine to resume fuel supply or maintain fuel cut according to the temperature in the cab, the air conditioner set temperature and the temperature difference value, the method further comprises: obtaining the number of drivers and passengers in the vehicle; a first temperature threshold is determined based on the number of occupants in the vehicle and the ambient temperature.
It can be understood that the embodiment of the invention can determine the first temperature threshold according to the number of drivers and passengers in the vehicle and the table lookup of the ambient temperature, ensure that the lower the ambient temperature is, the lower the first temperature threshold is under the same number of drivers and passengers, and comprehensively consider the performances of heating comfort of the drivers and passengers of the real vehicle, vehicle running safety influenced by the fog of the vehicle window, fuel economy, drivability and the like.
It should be noted that, the first temperature threshold t B may be obtained by looking up a table according to the ambient temperature and the number of occupants in the vehicle through a set MAP table, as shown in table 2 below, and the value is a positive value, with the unit being ℃. The setting principle of the first temperature threshold t B is as follows: under the same number of drivers and passengers N, the lower the ambient temperature t Ambient is, the smaller the ambient temperature t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) is, so that the engine is easy to recover oil supply, the water temperature t E of the engine is improved as soon as possible, the heating and defogging requirements of the drivers and passengers are met, the heating comfort and the driving safety of the passengers are ensured, and correspondingly, the higher the ambient temperature t Ambient is, the higher the ambient temperature t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) is; at the same environment temperature t Ambient, the larger the number of drivers and passengers N is, the smaller the number of t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … …) is, the engine is easy to recover oil supply, the water temperature t E of the engine is improved as soon as possible, the heating and defogging requirements of the drivers and passengers are met, the heating comfort and the driving safety of the vehicle drivers and passengers are ensured, and correspondingly, the smaller the number of drivers and passengers N is, the larger the number of t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … …) is. In the embodiment of the invention, the first temperature threshold t B is higher than the second temperature threshold t Thres, and the difference between the first temperature threshold t B and the second temperature threshold is greater than a preset threshold Δt △,tBjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) and a preset threshold Δt △, which can be set according to comprehensive consideration of the heating comfort of a driver and a passenger of a real vehicle, the running safety of the vehicle affected by the fogging of a vehicle window, the fuel economy, the drivability and other performances.
Specifically, in connection with table 2, when the acquired ambient temperature is-10 ℃, and the number of occupants is 2, the corresponding first temperature threshold is selected to be 7 ℃.
TABLE 2 first temperature threshold MAP table
In one embodiment of the invention, controlling the engine to resume fueling or maintain fuel cut according to the temperature in the cab, the air conditioner set temperature and the temperature difference comprises: and if the temperature in the cab is lower than the set temperature of the air conditioner and the temperature difference is greater than the first temperature threshold, controlling the engine to recover oil supply, otherwise, controlling the engine to maintain oil cut.
In combination with the foregoing, the second temperature threshold t Thres may be 5 ℃ and the preset threshold Δt △ may be 3 ℃ in an exemplary manner, so that the first temperature threshold t B is higher than 8 ℃ in an exemplary manner, and the first temperature threshold t B and the preset threshold Δt △ may be set according to comprehensive consideration of the heating comfort of a driver and a passenger of the real vehicle, the running safety of the vehicle affected by the fogging of the vehicle window, the fuel economy, the drivability and other performances in particular, and the invention is not limited specifically.
It can be understood that if the temperature in the cab is detected to be lower than the set temperature of the air conditioner and the temperature difference is larger than the first temperature threshold, the embodiment of the invention indicates that the adjusting effect of the air conditioner does not meet the temperature requirement of a driver and passengers at the moment, and the engine needs to be controlled to recover oil supply, so that the adjusting effect of the air conditioner is ensured to meet the target temperature requirement, and the driving experience of the user is improved; otherwise, the air conditioner adjusting effect meets the temperature requirement of drivers, namely the heating and defogging requirements of the drivers, and the fuel cut-off state of the engine is continuously maintained so as to ensure the fuel economy of the vehicle.
Specifically, when the temperature t Air in the cab monitored by the temperature sensor of the ATC system is lower than the air conditioner set temperature t S and the difference Δt between the two is greater than the first temperature threshold t B, the ECU controls the engine to resume oil supply, otherwise, the ECU controls the engine to maintain the fuel cut state.
In the embodiment of the invention, the first temperature threshold is higher than the second temperature threshold, and the difference value of the first temperature threshold and the second temperature threshold is larger than a preset threshold.
The preset threshold may be 3 ℃, and may be set according to actual requirements, which is not particularly limited in the present invention.
Specifically, the first temperature threshold t B of the embodiment of the present invention should be higher than the second temperature threshold t Thres and the difference between the two should be greater than the preset threshold Δt △, so as to avoid the engine from switching back and forth between fuel cut and fuel recovery control due to the tiny fluctuation of the temperature t Air in the cab monitored by the temperature sensor for the ATC system.
In an embodiment of the present invention, before controlling the engine to maintain fuel cut, the method further includes: acquiring the rotation speed of an engine and the opening degree of an accelerator pedal; and if the engine speed is higher than the first speed threshold and the opening of the accelerator pedal is smaller than the first opening threshold, controlling the engine to maintain fuel cut, otherwise, controlling the engine to recover fuel supply.
It can be understood that when the engine speed is higher than the first speed threshold and the opening of the accelerator pedal is smaller than the first opening threshold, the embodiment of the invention controls the engine to maintain fuel cut, and comprehensively considers the performances of real vehicle power, fuel economy, drivability, braking safety and the like.
It should be noted that, when the engine is in the fuel cut state, and the engine rotation speed n E is lower than the first rotation speed threshold, that is, the fuel supply restoration rotation speed threshold n R, or the accelerator pedal opening α is greater than the first opening threshold α T, or the temperature t Air in the cab monitored by the ATC system by the temperature sensor is lower than the air conditioner set temperature t S and the difference Δt between the two is greater than the first temperature threshold t B, the ECU controls the engine to restore fuel supply, otherwise, the ECU controls the engine to maintain the fuel cut state.
The recovered oil supply rotational speed threshold n R is obtained by subtracting a rotational speed difference deltan from an oil cut rotational speed threshold n T, and the rotational speed difference deltan can be obtained by looking up a table according to a set MAP according to the engine water temperature t E and the gear G, and the value of the rotational speed difference deltan is a positive value in r/min as shown in the following table 3. Since the setting principle of the return fuel supply rotational speed threshold n R is similar to that of the fuel cut rotational speed threshold n T, Δn ij (i=1, 2, … … 6;j =1, 2,3 … … 5) may be set to the same value at different engine water temperatures t E and gear G in table 3, or may be set in consideration of performance such as actual vehicle dynamics, fuel economy, drivability, and braking safety.
TABLE 3 MAP table for rotational speed difference
Specifically, if the current engine water temperature is-30 ℃, the gear is 2, the rotation speed difference is 300r/min through table lookup, and the accelerator pedal opening alpha is greater than the first opening threshold alpha T, which indicates that the driver steps on the accelerator pedal, and the first opening threshold alpha T can be set according to comprehensive consideration of the actual accelerator pedal characteristics, fuel economy and drivability, for example: illustratively can be set to 2%.
According to the engine oil supply control method provided by the embodiment of the invention, when the vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in a mountain area, the current environment temperature is detected, if the current environment temperature meets the set low temperature condition, the temperature difference between the temperature in a cab and the set temperature of an air conditioner under the condition of engine oil failure is calculated, and the engine oil supply recovery or the oil failure maintenance is controlled based on the temperature in the cab, the set temperature of the air conditioner and the temperature difference together, so that the influence of the long-time oil failure of the engine on the heating comfort and the running safety of a vehicle driver and passengers is avoided, the fuel economy, the drivability, the braking safety and the service life of a braking device of the vehicle can be guaranteed to the greatest extent, and the comprehensive performance of the vehicle is considered.
The engine fueling control method for considering the overall performance of the vehicle according to the present invention will be described in detail with reference to fig. 2 and 3, and comprises the following specific steps:
step 1, determining a temperature value;
A method for obtaining a temperature difference delta t between an indoor temperature t Air monitored by a temperature sensor according to an ATC system and an air conditioner set temperature t S is adopted, and specifically:
And determining the ambient temperature t Ambient and the difference delta t between the temperature t Air in the cab and the set temperature t S of the air conditioner, which are monitored by the ATC system through a temperature sensor, wherein the ambient temperature t Ambient is measured through the ambient temperature sensor in the vehicle and is sent to the ATC system, and then the ambient temperature t Ambient is sent to the ECU through a controller area network CAN bus by the ATC system.
The temperature sensor for ATC system is located in the cab, typically near the right leg of the driver, in the B-pillar or in the headrest, etc., and can monitor the temperature t Air in the cab, and obtain the difference Δt between the temperature t Air and the air-conditioning set temperature t S, specifically Δt=t S-tAir.
Under normal conditions, after the window is closed and the temperature in the cab is regulated to approach a balanced state, the absolute value of Deltat delta t is within a second temperature threshold t Thres, t Thres is a positive value, the unit is the temperature, the value is from an ATC calibration test result, generally 0-5 ℃, and if the absolute value of Deltat delta t still exceeds t Thres after the air conditioner is opened for a long time in the window closing state, the air conditioner regulating effect is indicated to not meet the temperature requirement of drivers and passengers. Simultaneously, t S and t Air are sent to the ECU through the CAN bus by the ATC system, and the ECU CAN calculate delta t by itself.
And 2, controlling fuel cut-off and fuel restoration of the engine according to the determined temperature value and the vehicle operation parameters.
The vehicle operation parameters include engine torque T E, engine rotation speed N E, accelerator pedal opening alpha, engine water temperature T E, gear G and number of drivers N, wherein the engine torque T E is calculated by the ECU, the engine rotation speed N E is directly sent to the ECU by an engine rotation speed sensor, the accelerator pedal opening alpha is directly sent to the ECU by an accelerator pedal opening sensor, the engine water temperature T E is directly sent to the ECU by an engine water temperature sensor, the gear G is sent to the ECU by the TCU through a CAN bus, the number of drivers N is sent to the BCM by a human sitting sensor in each seat of the vehicle, and then sent to the ECU by the BCM through the CAN bus.
2.1 Control method for controlling engine fuel cut-off by ECU according to temperature difference Deltat, engine torque T E, engine speed n E and accelerator pedal opening alpha
When the vehicle is in a normal oil injection operation state, when the engine torque T E is smaller than the oil cut-off torque threshold T T、 and the engine rotating speed n E is higher than a second rotating speed threshold, namely an oil cut-off rotating speed threshold n T, the opening alpha of the accelerator pedal is smaller than a second opening threshold alpha Z, and the difference delta T between the temperature T Air in the cab monitored by the ATC system through a temperature sensor and the air conditioner set temperature T S is smaller than a second temperature threshold T Thres, the ECU controls the engine to cut off oil, otherwise, the ECU controls the engine to maintain the normal oil injection operation state, namely continuous oil cut-off.
2.2 Setting principle and setting method of oil-break rotating speed threshold n T
The fuel cut-off torque threshold T T may be specifically set according to the fuel economy, drivability, and heating defogging performance of the real vehicle. The fuel cut-off rotating speed threshold n T can be obtained by looking up a table according to the engine water temperature t E and the vehicle gear G through a set MAP table in combination with the concrete performance of the real vehicle, and takes the vehicle with the 6-gear automatic transmission as an example, the fuel cut-off rotating speed threshold n T is shown in a table 1, and the value of the fuel cut-off rotating speed threshold n T is a positive value, and the unit is r/min.
In general, the setting principle of the fuel cut-off rotation speed threshold n T is as follows: under the same gear G, the lower the engine water temperature t E is, the higher n Tij (i=1, 2,3 … … 6;j =1, 2,3 … … 5) is, so that the engine is not easy to cut off oil, the engine water temperature t E is improved, the fuel economy and emission performance of the vehicle are facilitated, and correspondingly, the higher the engine water temperature t E is, the lower n Tij (i=1, 2,3 … … 6;j =1, 2,3 … … 5) is, so that the engine is easy to cut off oil, and the fuel economy of the vehicle is facilitated; the lower the water temperature t E of the same engine, the higher the gear is, the higher the n Tij (i=1, 2,3 … … 6;j =1, 2,3 … …) is, so that the engine is not easy to cut off oil, the engine rotation speed is not dragged down or flameout in emergency braking, and the dynamic property of the vehicle is guaranteed, correspondingly, the higher the gear is, the lower the n Tij (i=1, 2,3 … … 6;j =1, 2,3 … …) is, so that the engine is easy to cut off oil, and the fuel economy of the vehicle is facilitated. The fuel cut-off rotation speed threshold n T can be set according to comprehensive consideration of the performance of the real vehicle such as dynamic performance, fuel economy, drivability and braking safety.
TABLE 1 oil cut-off speed threshold MAP table
Specifically, when the water temperature of the engine is 30 ℃, the gear is 3, and the corresponding oil-breaking rotation speed threshold is 1800r/min.
2.3 Control method for controlling engine to resume oil supply by ECU according to temperature difference Deltat, engine speed n E and accelerator pedal opening alpha
When the engine is in a fuel cut state, and the engine rotating speed n E is lower than a first rotating speed threshold, namely a fuel supply restoration rotating speed threshold n R, or the accelerator pedal opening alpha is larger than a first opening threshold alpha T, or the temperature t Air in the cab monitored by the temperature sensor for the ATC system is lower than an air conditioner set temperature t S and the difference delta t between the temperature t and the temperature is larger than a first temperature threshold t B, the ECU controls the engine to restore fuel supply, otherwise, the ECU controls the engine to maintain the fuel cut state.
2.4, Setting principle and setting method of rotational speed difference delta n between oil cut rotational speed threshold n T and recovered oil supply rotational speed threshold n R
The recovered oil supply rotational speed threshold n R is obtained by subtracting a rotational speed difference Deltan from the oil cut rotational speed threshold n T, and the rotational speed difference Deltan can be obtained by looking up a table according to the engine water temperature t E and the gear G through a set MAP table, and the value of the rotational speed difference Deltan is a positive value and is expressed in r/min as shown in the following table 3. Since the setting principle of the return fuel supply rotational speed threshold n R is similar to that of the fuel cut rotational speed threshold n T, Δn ij (i=1, 2, … … 6;j =1, 2,3 … … 5) may be set to the same value at different engine water temperatures t E and gear G in table 3, or may be set in consideration of performance such as actual vehicle dynamics, fuel economy, drivability, and braking safety.
TABLE 3 MAP table for rotational speed difference
Specifically, if the current engine water temperature is-30 ℃, and the gear is 2 gear, the rotation speed difference is 300r/min through table lookup.
2.5 Setting principle and setting method of first opening threshold alpha T
The accelerator pedal opening α being greater than the first opening threshold α T indicates that the driver has stepped on the accelerator pedal, and the first opening threshold α T may be set in consideration of the actual accelerator pedal characteristics, fuel economy, and drivability, for example: illustratively can be set to 2%.
2.6, First temperature threshold t B, principle and method for setting according to ambient temperature t Ambient and number of drivers N
The temperature t Air in the cab monitored by the temperature sensor for the ATC system is lower than the set temperature t S of the air conditioner, and the difference Deltat between the temperature t Air and the set temperature t S of the air conditioner is larger than the first temperature threshold t B, so that the temperature of the engine is indicated to be continuously reduced to a lower temperature due to overlong fuel cut-off duration, the adjusting effect of the air conditioner cannot meet the temperature demands of drivers and passengers, namely the heating and defogging demands of the drivers and passengers, therefore, the engine is required to be controlled to recover the fuel supply, the water temperature t E of the engine is improved, the heating comfort and the driving safety of the drivers and passengers of the vehicle are met.
The first temperature threshold t B may be obtained by looking up a MAP table according to the ambient temperature and the number of occupants in the vehicle, and is a positive value in degrees celsius as shown in table 2 below. The setting principle of the first temperature threshold t B is as follows: under the same number of drivers and passengers N, the lower the ambient temperature t Ambient is, the smaller the ambient temperature t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) is, so that the engine is easy to recover oil supply, the water temperature t E of the engine is improved as soon as possible, the heating and defogging requirements of the drivers and passengers are met, the heating comfort and the driving safety of the passengers are ensured, and correspondingly, the higher the ambient temperature t Ambient is, the higher the ambient temperature t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) is; at the same environment temperature t Ambient, the larger the number N of drivers is, the smaller t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … …) is, the engine is easy to recover oil supply, the engine water temperature t E is improved as soon as possible, the heating and defogging requirements of the drivers are met, the heating comfort and the driving safety of the drivers are ensured, correspondingly, the smaller the number N of the drivers is, the larger t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … …) is, and the comprehensive consideration setting can be carried out on the performances such as t Bjk (j=1, 2,3 … … 5;k =1, 2,3 … … 5) and the preset threshold Deltat △ according to the heating comfort of the drivers of the real vehicles, the driving safety, the fuel economy and the driving performance influenced by vehicle window fogging.
TABLE 2 first temperature threshold MAP table
Specifically, in combination with table 2 above, when the acquired ambient temperature is-10 ℃, and the number of occupants is 2, the corresponding first temperature threshold is selected to be 7 ℃.
2.7, Wherein 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 Δt △, so as to avoid the cycle reciprocating switching of the engine between fuel cut and fuel supply recovery control caused by the tiny fluctuation of the temperature t Air in the cab monitored by the temperature sensor for the ATC system, and ensure the fuel economy and drivability of the vehicle.
In summary, the embodiment of the invention has the following beneficial effects:
(1) According to the embodiment of the invention, the difference between the temperature in the cab monitored by the temperature sensor for the ATC system and the set temperature of the air conditioner is taken into the conditions of engine fuel cut-off and oil supply recovery control, and the environment temperature and the number of drivers are considered, so that the problem that the heating comfort and the running safety of the drivers and the passengers of the vehicle are influenced due to long-time fuel cut-off of the engine when the vehicle runs in a slope shifting mode under the working conditions of low temperature and long downhill in a mountain area can be effectively solved, and meanwhile, the fuel economy, the drivability, the braking safety and the service life of a braking device of the vehicle can be furthest ensured, and the comprehensive performance of the vehicle is considered;
(2) The embodiment of the invention can effectively avoid the cyclic reciprocating switching of the engine between fuel cut and oil supply recovery control, ensure the fuel economy and drivability of the vehicle and give consideration to the comprehensive performance of the vehicle;
(3) The embodiment of the invention does not influence the running of the vehicle in a slope gear shifting mode under the working conditions of low temperature and long downhill in mountain areas, can still realize the auxiliary braking of the vehicle under the working conditions of downhill by utilizing the slope gear shifting mode, is beneficial to the braking safety and the service life of the braking device when the vehicle runs downhill, and can give consideration to the comprehensive performance of the vehicle;
(4) The embodiment of the invention only needs to adjust and perfect the control logic related to the engine fuel-cut control and the fuel-cut recovery control conditions in the ECU, does not need to change vehicle hardware, has small workload and low cost, and is easy to realize; is simple and practical, and can be effectively applied to engineering practice.
Next, an engine oil supply control device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 4 is a block schematic diagram of an engine oil supply control device according to an embodiment of the present invention.
As shown in fig. 4, the engine oil supply control device 10 includes: a detection module 100, a calculation module 200 and a control module 300.
The detection module 100 is configured to detect an ambient temperature when the vehicle is in a downhill condition, where the downhill condition is that a gradient of a long downhill road where the vehicle is currently located is greater than or equal to a preset gradient; the calculating module 200 is configured to calculate a temperature difference between a temperature in a cab and a set temperature of an air conditioner under an engine fuel cut condition if an ambient temperature meets a preset low temperature condition, where the preset low temperature condition is that the ambient temperature is lower than a preset temperature; the control module 300 is configured to control the engine to resume fueling or maintain fuel cut based on the temperature in the cabin, the air conditioning set temperature, and the temperature difference.
In an embodiment of the present invention, the control module 300 is further configured to: and if the temperature in the cab is lower than the set temperature of the air conditioner and the temperature difference is greater than the first temperature threshold, controlling the engine to recover oil supply, otherwise, controlling the engine to maintain oil cut.
In an embodiment of the present invention, the method further includes: the first acquisition module is used for acquiring the number of drivers and passengers in the vehicle; a first temperature threshold is determined based on the number of occupants in the vehicle and the ambient temperature.
In an embodiment of the present invention, the method further includes: the second acquisition module is used for acquiring the engine rotating speed and the accelerator pedal opening; and if the engine speed is higher than the first speed threshold and the opening of the accelerator pedal is smaller than the first opening threshold, controlling the engine to maintain fuel cut, otherwise, controlling the engine to recover fuel supply.
In an embodiment of the present invention, the method further includes: the third acquisition module is used for acquiring the engine torque, the engine rotating speed, the accelerator pedal opening and the temperature difference between the temperature in the cab and the air conditioner set temperature under the condition of engine oil supply; and if the engine torque is smaller than the torque threshold value, the engine speed is higher than the second speed threshold value, the opening of the accelerator pedal is smaller than the second opening threshold value, and the absolute value of the temperature difference is smaller than the second temperature threshold value, controlling the engine to cut off fuel, otherwise, maintaining the engine to supply fuel.
Optionally, the first temperature threshold is higher than the second temperature threshold, and the difference value of the first temperature threshold and the second temperature threshold is greater than a preset threshold.
It should be noted that the foregoing explanation of the embodiment of the engine oil supply control method is also applicable to the engine oil supply control device of this embodiment, and will not be repeated here.
According to the engine oil supply control device provided by the embodiment of the invention, when a vehicle runs in a slope gear shifting mode under the working conditions of low temperature and long downhill in a mountain area, the current environment temperature is detected, if the current environment temperature meets the set low temperature condition, the temperature difference between the temperature in a cab and the set temperature of an air conditioner under the condition of engine oil break is calculated, and the engine oil supply recovery or the maintenance of oil break is controlled together based on the temperature in the cab, the set temperature of the air conditioner and the temperature difference, so that the influence of long-time oil break of the engine on the heating comfort and the running safety of drivers and passengers of the vehicle is avoided, the fuel economy, the driving performance, the braking safety and the service life of a braking device of the vehicle can be guaranteed to the maximum extent, and the comprehensive performance of the vehicle is considered.
Fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. The vehicle may include:
memory 501, processor 502, and a computer program stored on memory 501 and executable on processor 502.
The processor 502 implements the engine oil supply control method provided in the above-described embodiment when executing a program.
Further, the vehicle further includes:
a communication interface 503 for communication between the memory 501 and the processor 502.
Memory 501 for storing a computer program executable on processor 502.
The memory 501 may include high-speed RAM (Random Access Memory ) or may include non-volatile memory, such as at least one disk memory.
If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 may be connected to each other via a bus and perform communication with each other. The bus may be an ISA (Industry Standard Architecture ) bus, a PCI (PERIPHERAL COMPONENT, external device interconnect) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 5, but not only one bus or one type of bus.
Alternatively, 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 may perform communication with each other through internal interfaces.
The processor 502 may be a CPU (Central Processing Unit ) or an ASIC (Application SPECIFIC INTEGRATED Circuit, application specific integrated Circuit) or one or more integrated circuits configured to implement embodiments of the present invention.
The embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the engine oil supply control method as above.
The embodiment of the invention also provides a computer program which is used for realizing the engine oil supply control method of the embodiment when being executed.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. An engine oil supply control method, characterized by comprising the steps of:
Detecting the environment temperature of the vehicle under a downhill working condition, wherein the downhill working condition is that the gradient of a long downhill road where the vehicle is currently positioned is larger than or equal to a preset gradient;
If the environmental temperature meets the preset low-temperature condition, calculating a temperature difference value between the temperature in the cab and the set temperature of the air conditioner under the condition that the engine is in a fuel cut state, wherein the preset low-temperature condition is that the environmental temperature is lower than the preset temperature;
and controlling the engine to recover oil supply or maintain oil interruption according to the temperature in the cab, the set temperature of the air conditioner and the temperature difference value.
2. The engine oil supply control method according to claim 1, characterized in that the controlling the engine to resume oil supply or to maintain oil cut according to the temperature in the cabin, the air conditioner set temperature, and the temperature difference value includes:
And if the temperature in the cab is lower than the set temperature of the air conditioner and the temperature difference is greater than a first temperature threshold, controlling the engine to recover oil supply, otherwise, controlling the engine to maintain oil cut.
3. The engine oil supply control method according to claim 2, characterized by further comprising, before controlling the engine to resume oil supply or to maintain fuel cut according to the temperature in the cabin, the air conditioner set temperature, and the temperature difference value:
Obtaining the number of drivers and passengers in the vehicle;
And determining the first temperature threshold according to the number of passengers in the vehicle and the environmental temperature.
4. The engine oil supply control method according to claim 2, characterized by further comprising, before controlling the engine to maintain fuel cut:
acquiring the rotation speed of an engine and the opening degree of an accelerator pedal;
And if the engine speed is higher than a first speed threshold and the opening of the accelerator pedal is smaller than a first opening threshold, controlling the engine to maintain fuel cut, otherwise, controlling the engine to recover fuel supply.
5. The engine oil supply control method according to claim 2, characterized by further comprising, before calculating a temperature difference between the temperature in the cabin and the air conditioner set temperature in the event of an engine oil break:
acquiring the engine torque, the engine rotating speed, the accelerator pedal opening and the temperature difference between the temperature in a cab and the set temperature of an air conditioner under the condition of engine oil supply;
And if the engine torque is smaller than a torque threshold, the engine rotating speed is higher than a second rotating speed threshold, the accelerator pedal opening is smaller than a second opening threshold, and the absolute value of the temperature difference is smaller than a second temperature threshold, controlling the engine to cut off oil, otherwise, maintaining the engine to supply oil.
6. The engine oil supply control method according to claim 5, characterized in that the first temperature threshold is higher than the second temperature threshold by a difference greater than a preset threshold.
7. An engine oil supply control device, characterized by comprising:
The detection module is used for detecting the environment temperature when the vehicle is in a downhill working condition, wherein the downhill working condition is that the gradient of a long downhill road where the vehicle is currently located is larger than or equal to a preset gradient;
The calculating module is used for calculating the temperature difference between the temperature in the cab and the set temperature of the air conditioner under the condition of engine oil failure if the environment temperature meets the preset low temperature condition, wherein the preset low temperature condition is that the environment temperature is lower than the preset temperature;
And the control module is used for controlling the engine to recover oil supply or maintain oil interruption according to the temperature in the cab, the set temperature of the air conditioner and the temperature difference value.
8. A vehicle, characterized by comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the engine oil supply control method according to any one of claims 1 to 6.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor for realizing the engine oil supply control method according to any one of claims 1 to 6.
10. A computer program, characterized in that the computer program, when executed, is adapted to carry out the engine oil supply control method according to any one of claims 1-6.
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| CN116923030A (en) * | 2022-04-21 | 2023-10-24 | 沃尔沃卡车集团 | Computer-implemented method of controlling cabin climate in a vehicle traveling on a road |
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