CN112160815A - Method and device for delaying engine oil dilution and vehicle - Google Patents
Method and device for delaying engine oil dilution and vehicle Download PDFInfo
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- CN112160815A CN112160815A CN202010994457.4A CN202010994457A CN112160815A CN 112160815 A CN112160815 A CN 112160815A CN 202010994457 A CN202010994457 A CN 202010994457A CN 112160815 A CN112160815 A CN 112160815A
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- 239000010705 motor oil Substances 0.000 title claims abstract description 220
- 238000010790 dilution Methods 0.000 title claims abstract description 76
- 239000012895 dilution Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000003921 oil Substances 0.000 claims abstract description 290
- 238000011217 control strategy Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims description 71
- 230000001133 acceleration Effects 0.000 claims description 49
- 230000008859 change Effects 0.000 claims description 47
- 238000001514 detection method Methods 0.000 claims description 36
- 238000004590 computer program Methods 0.000 claims description 12
- 230000003068 static effect Effects 0.000 description 47
- 239000000446 fuel Substances 0.000 description 7
- 230000003111 delayed effect Effects 0.000 description 5
- 238000013507 mapping Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 239000000243 solution Substances 0.000 description 3
- 239000004606 Fillers/Extenders Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000003113 dilution method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M11/12—Indicating devices; Other safety devices concerning lubricant level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
Abstract
The invention discloses a method, a device and a vehicle for delaying engine oil dilution, wherein the method for delaying engine oil dilution comprises the following steps: detecting an oil level value of the engine; comparing the oil level value with a reference oil level value; and when the oil level values detected for multiple times are higher than the reference oil level value by a set value, executing an engine control strategy for delaying oil dilution. The device for delaying engine oil dilution provided by the embodiment of the invention executes the engine dilution delaying control strategy when the engine oil level values detected for a plurality of times continuously are higher than the reference engine oil level value by a certain value, and can accurately determine the condition of engine oil dilution in the engine oil because the engine oil level values detected for a plurality of times continuously are higher than the reference engine oil level value, thereby effectively delaying the engine oil dilution of the engine.
Description
Technical Field
The invention relates to the technical field of vehicles, the field of extended range electric automobiles and the technical field of engine oil monitoring, in particular to a method and a device for delaying engine oil dilution and a vehicle.
Background
In general, products of incomplete combustion of fuel, oil oxides or insoluble substances generated by friction are mixed into engine oil during engine operation, and the engine oil is diluted when the oil dilution rate and the engine oil kinematic viscosity change rate exceed certain limit values. Dilution of engine oil is a problem to be avoided in the field of automotive technology because it causes a series of problems such as reduced engine oil life, reduced fuel economy, reduced power performance, and reduced engine reliability and service life.
Compared with the conventional automobile, the extended range hybrid vehicle has more engine start and stop times and is relatively easy to have the problem of engine oil dilution, and most of the technical solutions for engine oil dilution in the prior art are considered from the aspect of engine body design or conventional engine control. And few solutions for effectively solving the problem of engine oil dilution of the extended-range hybrid vehicle are specifically combined with the operating characteristics of the extended-range hybrid vehicle.
Disclosure of Invention
Objects of the invention
The invention aims to provide a method, a device and a vehicle for delaying engine oil dilution.
(II) technical scheme
A first aspect of the present invention provides a method of delaying oil dilution, the method comprising: acquiring an engine oil level value of the engine, wherein the reference engine oil level value is acquired after engine oil is replaced by the engine for the last time; comparing the oil level value with a reference oil level value; and when the oil level values obtained continuously for multiple times are higher than the reference oil level value by a set value, executing an engine control strategy for delaying oil dilution.
In some embodiments, the engine control strategy to delay oil dilution comprises: reducing the frequency of engine shutdowns, and/or increasing the temperature of engine cooling water.
In some embodiments, the obtaining an oil level value of an engine comprises: determining the working condition of an engine, wherein the working condition of the engine comprises an engine stopping working condition and an engine running working condition; calling a reference engine oil level value corresponding to the working condition of the engine; and acquiring the engine oil level value of the engine corresponding to the working condition of the engine.
In some embodiments, the executing the engine strategy for delaying oil dilution when the oil level values obtained a plurality of times in succession are all higher than the reference oil level value by a set amount includes: and when the oil level values obtained continuously for multiple times are higher than the reference oil level value under the corresponding working condition by respective set values, executing an engine control strategy for delaying oil dilution.
In some embodiments, after determining the operating condition of the engine, before obtaining an oil level value of the engine corresponding to the operating condition of the engine, further comprising: obtaining the oil temperature of engine oil; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine.
In some embodiments, obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises: detecting the current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine working condition; and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
In some embodiments, obtaining the baseline oil level value after the last engine oil change comprises: determining the working condition of the engine; continuously detecting the engine oil level value corresponding to the working condition of the engine for multiple times; and determining the average value of the oil level values corresponding to the working conditions of the engine for multiple times as a reference oil level value corresponding to the working conditions of the engine.
In some embodiments, obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises: when the engine is in a stop condition, determining that the vehicle state satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃; and acquiring an engine oil level value corresponding to the stop working condition of the engine.
In some embodiments, obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises: when the engine is in the running working condition, determining that the vehicle state meets the following conditions: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
According to a second aspect of the present invention, there is provided an apparatus for delaying oil dilution, comprising: the liquid level detection module is used for acquiring an engine oil level value of the engine; the liquid level comparison module is used for comparing the engine oil level value with a reference engine oil level value, wherein the reference engine oil level value is obtained after the engine is changed for the latest time; and the execution module is used for executing an engine control strategy for delaying engine oil dilution when the engine oil level values obtained continuously and repeatedly are higher than the reference engine oil level value by a set value.
In some embodiments, the liquid level detection module is configured to determine an operating condition of an engine, the operating condition of the engine including an engine stop condition and an engine operating condition; calling a reference engine oil level value corresponding to the working condition of the engine; and acquiring the engine oil level value of the engine corresponding to the working condition of the engine.
In some embodiments, the execution module is configured to execute an engine control strategy for delaying oil dilution when the oil level values obtained multiple times in succession are all higher than the reference oil level value under the corresponding working condition by respective set values.
In some embodiments, the liquid level detection module is used for acquiring the oil temperature of the engine; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine.
In some embodiments, the oil level detection module is configured to detect a current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine working condition; and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
In some embodiments, the liquid level detection module is configured to determine that the vehicle condition satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃; acquiring an engine oil level value corresponding to an engine stop working condition; or the liquid level detection module is used for determining that the vehicle state meets the following conditions when the engine is in the running working condition: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
According to a third aspect of the invention, there is provided a vehicle comprising a memory and a processor; the memory for storing a computer program; the processor is configured to implement the method for delaying oil dilution provided in the first aspect when executing the computer program.
According to a fourth aspect of the present invention, there is provided an electronic device comprising a memory and a processor; the memory for storing a computer program; the processor is configured to implement the method for delaying oil dilution provided by the first aspect when executing the computer program.
According to a fifth aspect of the present invention, a computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method of delaying oil dilution provided by the first aspect.
(III) advantageous effects
The method for delaying engine oil dilution provided by the embodiment of the invention is characterized in that when the engine oil level values detected for a plurality of times continuously are higher than the reference engine oil level value by a certain value, a control strategy for delaying engine oil dilution is executed.
Drawings
FIG. 1 is a schematic flow diagram of a method for delaying oil dilution according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a delayed oil dilution device according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with the detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present application. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present application.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Before discussing the aspects of the present invention in detail, a brief introduction of the related technologies and terms will be made.
An engine oil level sensor: the sensor is arranged in a bottom shell of an oil tank of the engine and can measure the height of a real-time oil level value and the temperature of engine oil in the engine.
The extended range electric automobile comprises an engine and a motor which are connected through a shaft, wherein fuel oil of the engine is used for dragging a generator to generate electric quantity, one part of the electric quantity generated by the generator is used for driving the vehicle, and the other part of the electric quantity is stored in a battery module of the vehicle.
In general, products of incomplete combustion of fuel, oil oxides or insoluble substances generated by friction are mixed into engine oil during engine operation, and the engine oil is diluted when the oil dilution rate and the engine oil kinematic viscosity change rate exceed certain limit values. Dilution of engine oil is a problem that needs to be avoided in the field of vehicle technology because dilution of engine oil causes a series of problems such as reduced engine oil life, reduced fuel economy, reduced power performance, and reduced reliability and service life of engines.
The range-extended electric automobile or the hybrid electric automobile indicates the fuel of the engine and controls the electric automobile to generate electricity when the electric quantity of the battery module is low, and the engine does not need the fuel when the electric quantity of the battery module is high, so that the number of times that the engine of the type of electric automobile is not started all the time is more than that of the fuel automobile in the running process, and the problem of engine oil dilution is more likely to occur in the range-extended electric automobile.
The technical scheme provided by the invention is not used for solving the problem that the engine oil is easy to dilute in the conventional extended range electric vehicle or hybrid electric vehicle.
FIG. 1 is a schematic flow diagram of a method for delaying oil dilution according to a first embodiment of the present invention.
As shown in fig. 1, the method for delaying oil dilution includes: step S101-step S103.
In step S101, an oil level value of the engine is obtained.
And S102, comparing the oil level value with a reference oil level value, wherein the reference oil level value is obtained after the engine is changed for the latest time.
It can be understood that the reference oil level value can be re-determined after the engine is changed with oil each time, and the reference oil level value is re-determined after the engine is changed with oil each time because the oil content of the engine changed with oil each time may have slight difference, so that the detection error caused by the oil change can be avoided, and the engine control strategy for determining when to execute the oil dilution can be more accurately determined by the delayed oil dilution method.
And step S103, when the oil level values obtained continuously for multiple times are higher than the reference oil level value by a set value, executing an engine control strategy for delaying oil dilution.
Since the oil level sensor usually has a detection frequency, in order to reduce the error of the result of a single detection, an engine control strategy is set for determining to implement delayed oil dilution when the oil level values obtained continuously for multiple times are all higher than the reference oil level value by a set value.
Optionally, the number of consecutive times is, for example, 3 times, that is, when the oil level values obtained for 3 consecutive times are all higher than the reference oil level value by a set value, an engine control strategy for delaying oil dilution may be executed. The present invention is exemplified by 3 consecutive times, but not limited to.
Alternatively, the setting value is, for example, 5mm, 10mm, 15mm, which is not limited by the present invention.
In one embodiment, the obtaining of the oil level value of the engine in step S101 includes: an operating condition of the engine is determined, including an engine stop condition and an engine run condition. Calling a reference engine oil level value corresponding to the working condition of the engine; and acquiring the engine oil level value of the engine corresponding to the working condition of the engine.
In the embodiment, the reference oil level values corresponding to various working conditions are determined after the oil is changed for the last time, so that the reference oil level values determined after the oil is changed for the last time can be stored and recorded, and the reference oil level values can be directly called when a method for delaying oil dilution is required.
Specifically, after the engine is changed for each time, the reference engine oil level value is detected once, that is, the newly detected reference engine oil level value will cover the original reference engine oil level value. The main reason is that the total amount of the engine oil is slightly different after the engine oil is replaced every time, so that the level value of the reference engine oil used as a reference needs to be determined again after the engine oil is replaced every time, and the serious error during comparison is avoided.
With reference to the foregoing embodiment, in the step S103, when the oil level values obtained in multiple consecutive times are all higher than the reference oil level value by a set value, an engine strategy for delaying oil dilution is implemented, including: and when the oil level values obtained continuously for multiple times are higher than the reference oil level value under the corresponding working condition by respective set values, executing an engine control strategy for delaying oil dilution.
Specifically, the acquired engine liquid level value comprises a static liquid level value and a dynamic liquid level value. And when the engine is in a stop working condition, the obtained engine oil level value is a static level value, and when the engine is in an operating working condition, the detected engine oil level value is a dynamic level value.
Accordingly, the reference oil level value includes a reference static level value and a reference dynamic level value.
And after the engine oil is replaced, detecting the reference static liquid level value when the engine is in a stop working condition, and after the engine oil is replaced, detecting the reference dynamic liquid level value when the engine is in an operating working condition.
In one embodiment, the step S101 of obtaining the oil level value of the engine includes: determining that the engine is in a stop working condition, and acquiring a static liquid level value detected by an engine oil level sensor; the step S102 of comparing the oil level value with the reference oil level value includes comparing the static level value with the reference static level value. Step S103, when the oil level values detected for a plurality of consecutive times are all higher than the reference oil level value by a set value, executing an engine control strategy for delaying oil dilution, including: and when the static liquid level values detected for a plurality of times continuously are higher than the reference static liquid level value by a first set value, executing an engine control strategy for delaying engine oil dilution.
For example, the reference static level value is 100mm, the reference dynamic level value is 95mm, the set value is 10mm, the predetermined number of times is 3 times, the measured static level value is Xmm, and the measured dynamic level value is Ymm, if X-100 is greater than 10 for 3 consecutive times or Y-95 is greater than 10 for 3 consecutive times, the execution condition is satisfied, and the engine control strategy of delaying engine oil dilution is executed. The predetermined number of times can be set according to the requirement of statistical calculation, such as 3, 4 or 5 times, and usually 3 times is selected. The set value can also be set according to the requirements of the control sensitivity, for example, 5, 10 or 15, usually 10.
When the difference between the static liquid level value and the reference static liquid level value or the difference between the dynamic liquid level value and the reference dynamic liquid level value is judged, the judgment is carried out by adopting the condition that the continuous preset times are greater than or not greater than the judgment, because the vehicle possibly has bump or other unstable conditions in the running process, the detection data of one single time often has contingency, so the detection of the continuous preset times is required, the continuous judgment by using the continuous detection data is to avoid the contingency condition possibly existing, and the specific continuous times can be preset, such as 3 times, 4 times or 5 times and the like.
In some embodiments, the engine control strategy for retarding oil dilution comprises: reducing the starting and stopping frequency of the engine; and/or increasing engine cooling water temperature.
For example, in the above embodiments, the engine control strategy for delaying oil dilution refers to setting a special engine control strategy for preventing or delaying oil dilution for an engine controller.
In some embodiments, when the engine control strategy of delaying oil dilution is executed, the starting frequency of the engine is controlled to be halved or the frequency of starting and stopping becomes 2/3, or a preset value. For example, the start-stop frequency of the engine is reduced, for example, for an extended range engine, the start-stop frequency is usually higher, if the start-stop frequency under normal conditions is 10 times/hour, when the risk of engine oil dilution is detected, the start-stop frequency is controlled to be 5 times/hour, and the start-stop frequency of the extended range engine per hour is reduced at the expense of increasing the work load of a power battery or reducing the power consumption of other electric equipment. Or may also counteract or delay dilution of the engine oil by postponing the action of the engine thermal management components, i.e. increasing the engine cooling water temperature by slowing down the heat rejection. These strategies described above may be implemented individually or in combination.
In some embodiments, the engine and engine controller is a range extender and range extender controller, such as in a hybrid vehicle.
In one embodiment, the detecting the oil level value of the engine of step S101 includes: and determining that the engine is in the running working condition, and detecting the dynamic liquid level value. The comparing the oil level value to the reference oil level value of step S102 includes comparing the dynamic level value to a reference dynamic level value. The step S103 of executing an engine control strategy for delaying engine oil dilution when the engine oil level values detected for a plurality of consecutive times are all higher than the reference engine oil level value by a set value includes: and when the dynamic liquid level values detected for a plurality of times are higher than the reference dynamic liquid level value by a second set value, executing an engine control strategy for delaying engine oil dilution.
It is understood that the first set point may be the same as or different from the second set point.
In some embodiments, after determining the operating condition of the engine in step S101, before acquiring the oil level value of the engine corresponding to the operating condition of the engine in step S103, the method further includes: obtaining the oil temperature of engine oil; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine.
It is understood that, in the present embodiment, the oil temperature of the engine is acquired; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; the obtaining of the oil level value of the engine may be performed before the reference oil level value corresponding to the working condition of the engine is obtained, may be performed after the reference oil level value corresponding to the working condition of the engine is obtained, or may be performed simultaneously with the reference oil level value corresponding to the working condition of the engine, which is not limited in the present invention. Preferably, before a reference oil level value corresponding to the working condition of the engine is obtained, the delay time corresponding to the working condition of the engine is determined according to the oil temperature of the engine; and then, a reference oil level value corresponding to the working condition of the engine is taken when the delay time is continued.
With the above embodiment, before obtaining the oil temperature of the engine and determining the delay time corresponding to the operating condition of the engine, the method further includes: determining that the working conditions of the engine are switched in a time interval after the previous engine oil level detection before the current engine oil level detection; then determining the delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine. It can be understood that, in the present embodiment, the switching of the operating condition of the engine means that the operating condition of the engine is changed, or the operating condition of the engine is kept unchanged, but the state of the vehicle does not meet the oil level obtaining condition corresponding to the operating condition.
It can be understood that, in this embodiment, if the operating condition of the engine does not change within the time interval of twice detecting the oil level, and the state of the vehicle conforms to the oil level obtaining condition of the corresponding operating condition, the delay time may not be obtained, and the oil level value of the engine may be directly obtained. In the time interval between the two detections of the oil level, of course, if the operating conditions of the engine do not change,
in this embodiment, at the time interval of detecting the oil level twice, the condition of the engine does not change, which means that the engine always keeps a stop condition, and the vehicle state meets the engine oil obtaining condition corresponding to the stop condition of the engine. Wherein the engine oil liquid level that the vehicle state accords with the engine and stops the operating mode and correspond obtains the condition and include: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than 0.01g/10s or the engine oil temperature is one or more of 20 ℃ to 90 ℃.
Or, in the time interval of detecting the engine oil level twice, the condition of the engine is not changed, that is, the engine is always in the running condition, and the vehicle state meets the engine oil obtaining condition corresponding to the running condition of the engine. Wherein the engine oil liquid level that the vehicle state accords with the engine operating mode and corresponds obtains the condition including: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
In this embodiment, after the state of the engine in the vehicle meets the engine level value obtaining condition corresponding to the corresponding working condition, the delay time corresponding to the working condition of the engine is obtained first, and after the delay time is continued, the engine oil level value is detected, where the delay time is to confirm that the engine oil level value is stable, so as to avoid inaccurate detected data.
In an alternative embodiment, the delay time for the engine to be in the stopped condition is, for example, 5 seconds.
In an alternative embodiment, the corresponding delay time is, for example, 3 seconds when the engine is in an operating condition.
It is to be understood that, in this step, the delay time is obtained in consideration of the fact that the oil level may fluctuate from the operation to non-operation of the engine when the engine is in a stop condition, and therefore, a delay is made for a certain time in order to wait for the oil to flow back into the oil tank. And when the engine is in the operating condition, when the engine operates, the engine oil needs to be stirred, and when the engine operates, the setting of the backflow time also needs to consider the stability that the engine oil is not stirred to the stirring state and the backflow time, so the embodiment is to avoid the inaccurate level value of the detected engine oil caused by the fluctuation of the liquid level of the engine oil possibly caused by the operating condition of the engine, and therefore, the setting is carried out after a certain time delay before each detection, and the detection precision is improved.
The determining of the delay according to the oil temperature may set a delay time corresponding to a higher oil temperature to be shorter, where the oil temperature generally affects the viscosity of the oil, and the delay time may be set to be shorter as the oil temperature is higher and the oil backflow time is shorter. The working condition of the engine, the temperature of engine oil under the corresponding working condition and the time delay of each temperature are preset with a mapping table for storage, and when the time delay is required to be obtained, the mapping table is directly called from the storage.
In one embodiment, obtaining an oil level value of the engine corresponding to a working condition of the engine comprises: detecting the current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine working condition; and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
It is understood that the delay time under the engine stop condition may be the same as or different from the delay time under the engine operation condition, and the time duration of the two may be any value, which is not limited by the present invention.
In one embodiment, determining that the engine is in a stopped condition, the step of detecting a static level value includes: determining that the engine is in a stop condition; detecting the current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine under a stop working condition; and adding the current oil level value and the compensation value to obtain the static level value.
In this embodiment, the compensation value of the oil level value corresponding to the engine being in the stop condition may be obtained, for example, by calling a preset mapping table, and searching the compensation value of the current oil level value in the mapping table according to the current temperature of the oil and the acceleration of the vehicle. The mapping table includes a compensation value of an oil level value at each oil temperature, and a compensation value of an oil level value corresponding to an acceleration of a different vehicle at each oil temperature.
In another embodiment of the present invention, compensation values for oil level values under different conditions may be determined in advance in a laboratory environment.
Specifically, under the condition that the acceleration of the vehicle is a first acceleration under the stop working condition of the engine, a first volume of engine oil with a first temperature is poured into the engine, and the current engine oil temperature and the current engine oil level value are detected. Then, under the condition of constant acceleration, the engine oil with the first volume and the second temperature is poured into the engine, and the temperature and the oil level value of the current engine oil are detected. The constant acceleration and the constant volume are ensured, and the engine oil level value of the engine under the stop working condition is detected under the condition of changing the oil temperature, so that a plurality of groups of data are obtained. And then constructing a fitting curve according to the oil temperature and the oil level value. And obtaining a fitting curve of the oil level value and the oil temperature under the conditions of the first volume and the first acceleration. Then, the oil level value corresponding to one standard temperature can be set as a standard value. Therefore, the engine oil level value compensation value corresponding to each temperature is obtained when the acceleration of the vehicle is the first acceleration and the engine oil is the first volume.
For example, the acceleration of the vehicle is determined to be 0, the oil amount is 3L, and the corresponding oil level value is 88mm when the oil temperature is 33 ℃, namely, when the acceleration is 0 and the oil amount is 3L, the corresponding oil level value is compensated to be 0, when the acceleration of the vehicle is 0 and the oil amount is 3L, the oil temperature is 89mm, when the acceleration of the vehicle is 0 and the oil amount is 3L, and the oil temperature is 50 ℃, the compensation value of the corresponding oil level value is 89-88 to +1mm, that is, when the oil level sensor is used to detect the oil level value in the subsequent actual process, when the vehicle acceleration is 0, the oil amount is 3L, and the oil temperature is 50 ℃, the current actual static level value can be obtained only by adding the compensation value 1mm to the value of the currently detected oil level value.
In one embodiment, the determining that the engine is in an operating condition and detecting a dynamic level value includes: determining that the engine is in an operating condition; detecting the current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine under the operating condition; and adding the current engine oil level value and the compensation value to obtain the dynamic liquid.
Specifically, in another embodiment of the present invention, compensation values for oil level values under different conditions may be determined in advance in a laboratory environment.
Specifically, under the condition that the acceleration of the vehicle is a second acceleration under the operating condition of the engine, the engine oil with a second volume and a second temperature is poured into the engine, and the current engine oil temperature and the current engine oil level value are detected. Then, under the acceleration constant condition, the engine oil with the second volume and the second temperature is poured into the engine, and the temperature and the oil level value of the current engine oil are detected. The constant acceleration and the constant volume are ensured, and the engine oil level value of the engine under the operating condition is detected under the condition of changing the oil temperature, so that a plurality of groups of data are obtained. And then constructing a fitting curve according to the oil temperature and the oil level value. And obtaining a fitting curve of the oil level value and the oil temperature under the conditions of the second volume and the second acceleration. Then, the oil level value corresponding to one standard temperature can be set as a standard value. Therefore, the engine oil level value compensation value corresponding to each temperature is obtained when the acceleration of the vehicle is the second acceleration and the engine oil is the second volume.
The volume of the engine oil is constant, the oil temperature is constant, and different engine oil level values are measured when the acceleration changes, so that a compensation value of the engine oil level value corresponding to each acceleration is obtained.
For example, the acceleration of the vehicle is determined to be 5km/s2The corresponding engine oil level value is 89mm when the oil mass is 3L and the engine oil temperature is 35 ℃, namely when the engine oil temperature is 5km/s2When the oil amount is 3L and the engine oil temperature is 35 ℃, the engine oil level value compensation of the corresponding engine under the operation working condition is 0, and when the acceleration of the vehicle is 5km/s2The oil quantity is 3L, and the oil temperature is 80mm, the oil level value corresponding to the oil level value at 20 ℃, and then the oil level value is 5km/s2When the oil amount is 3L and the temperature of the engine oil is 20 ℃, the compensation value of the corresponding engine oil level value is 80-88-8 mm, namely when the engine oil level sensor is used for detecting the engine oil level value subsequently and actually, when the vehicle is 5km/s2When the oil amount is 3L and the temperature of the engine oil is 20 ℃, the current actual dynamic level value can be obtained only by adding the compensation value of minus 8mm to the value of the currently detected engine oil level value.
In some embodiments, after each oil change of the engine, the data of the reference static level value and the reference dynamic level value originally stored in the electronic memory is cleared, and the data of the reference static level value and the reference dynamic level value re-determined after the oil change is stored.
The NVRAM is a non-volatile random access memory, and is generally a memory arranged in a vehicle main control unit, wherein an engine oil level sensor measures a static level value measured under an engine stop working condition and a dynamic level value measured under an engine running working condition, namely, the static level value and the dynamic level value are compared with a reference static level value and a reference dynamic level value read from the electronic memory to judge whether two difference values have continuous preset times which are larger than a set value or not, so that an engine control strategy for delaying engine oil dilution is determined to be executed or quit. Since the reference static level value and the reference dynamic level value are to be redetermined after each oil change, the original reference static level value and reference dynamic level value data in the memory NVRAM are to be cleared and replaced with new reference static level value and reference dynamic level value data.
In some embodiments, the obtaining the reference oil level value after the last engine oil change in step S101 includes: determining the working condition of the engine; continuously detecting the engine oil level value corresponding to the working condition of the engine for multiple times; and determining the average value of the oil level values corresponding to the working conditions of the engine for multiple times as a reference oil level value corresponding to the working conditions of the engine.
In one embodiment, said detecting a baseline oil level value after determining that the engine is changing oil comprises: determining that the engine is in a stop working condition after engine oil is replaced; continuously detecting the static liquid level value for multiple times; and determining the average value of the static liquid level values for multiple times as the reference static liquid level value.
In this embodiment, since the engine oil level value detected at a single time may be inaccurate, the average value of the plurality of continuously measured static level values is used as the reference static level value.
Optionally, the continuously detected static level values for 3 times are used as the reference static level value.
In one embodiment, the determining detects a baseline oil level value after the engine has changed oil, comprising: determining that the engine is in an operating condition after engine oil is replaced; continuously detecting the dynamic liquid level value for multiple times; and determining the average value of the dynamic liquid level values for multiple times as the reference dynamic liquid level value.
In this embodiment, since the engine oil level value detected at a single time may be inaccurate, the average value of multiple dynamic level values measured continuously is used as the reference dynamic level value.
Optionally, the dynamic level value detected 3 times continuously is used as the reference dynamic level value.
It can be understood that the reference static level value and the reference dynamic level value are mainly used for providing a reference for the variation of the static level value and the dynamic level value measured in the normal operation of the vehicle. Since the total amount of oil varies slightly after each oil change, the reference static level value and the reference dynamic level value are determined again after each oil change. In order to prevent the condition of engine oil damage after work from influencing the reference value, the static liquid level value and the dynamic liquid level value measured in the first round of continuous determination times after engine oil replacement are used as calculation data of the reference static liquid level value and the reference dynamic liquid level value. The number of determinations may be 3, 4 or 5, and may be selected to be 3 in general. The calculation method usually uses an averaging method, for example, if the static liquid level values measured in the first round for 3 consecutive times after the engine oil is changed are 97mm, 98mm and 99mm respectively, the reference static liquid level value is (97+98+ 99)/3-98 mm. For another example, if the dynamic level values measured in the first 3 consecutive engine oil changes are 93mm, 94mm and 95mm, respectively, the reference dynamic level value is (93+94+ 95)/3-94 mm.
In a specific embodiment, obtaining an oil level value of the engine corresponding to a working condition of the engine comprises: when the engine is in a stop condition; determining that the vehicle state satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃; and acquiring an engine oil level value corresponding to the stop working condition of the engine.
In some preferred embodiments, the collected data of the oil level sensor can be read as the level value of the oil level value under the engine stop condition at the current moment when the engine is in the stop condition and the vehicle is required to be powered on to meet the condition that the change rate of the vehicle speed is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is-0.1 g-0.1g, the change rate of the transverse and longitudinal acceleration of the vehicle is lower than 0.01g/10s, and the oil temperature is 20-90 ℃.
In another specific embodiment, obtaining an oil level value of the engine corresponding to a working condition of the engine comprises: when the engine is in the running working condition, determining that the vehicle state meets the following conditions: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
In some preferred embodiments, the engine is in the operating condition, and the vehicle needs to simultaneously meet the conditions that the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is-0.25 g-0.25g, and the change rate is lower than 0.01g/10s, and the engine oil temperature is 60-90 ℃, so that the data collected by the engine oil level sensor can be read as the level value of the engine oil level value under the operating condition of the engine at the current moment.
Fig. 2 is a schematic structural diagram of an apparatus for delaying oil dilution according to a first embodiment of the present invention.
As shown in fig. 2, the device for delaying oil dilution includes:
and the liquid level detection module is used for acquiring an engine oil level value of the engine.
And the liquid level comparison module is used for comparing the engine oil level value with a reference engine oil level value, wherein the reference engine oil level value is obtained after the engine is changed for the latest time.
It can be understood that the reference oil level value can be re-determined after the engine is changed with oil each time, and the reference oil level value is re-determined after the engine is changed with oil each time because the oil content of the engine changed with oil each time may have slight difference, so that the detection error caused by the oil change can be avoided, and the engine control strategy for determining when to execute the oil dilution can be more accurately determined by the delayed oil dilution method.
And the execution module is used for executing an engine control strategy for delaying engine oil dilution when the engine oil level values obtained continuously and repeatedly are higher than the reference engine oil level value by a set value.
Since the oil level sensor usually has a detection frequency, in order to reduce the error of the result of a single detection, an engine control strategy is set for determining to implement delayed oil dilution when the oil level values obtained continuously for multiple times are all higher than the reference oil level value by a set value.
Optionally, the number of consecutive times is, for example, 3 times, that is, when the oil level values obtained for 3 consecutive times are all higher than the reference oil level value by a set value, an engine control strategy for delaying oil dilution may be executed. The present invention is exemplified by 3 consecutive times, but not limited to.
Alternatively, the setting value is, for example, 5mm, 10mm, 15mm, which is not limited by the present invention.
In some embodiments, the execution module is configured to execute an engine control strategy for delaying oil dilution when the oil level values obtained multiple times in succession are all higher than the reference oil level value under the corresponding working condition by respective set values.
In some embodiments, the liquid level detection module is used for determining that the engine is in a stop condition and detecting a static liquid level value; the liquid level comparison module is used for comparing the static liquid level value with a reference static liquid level value; the execution module is used for executing an engine control strategy for delaying engine oil dilution when the static liquid level values detected for multiple times are higher than the reference static liquid level value by a first set value.
In some embodiments, the liquid level detection module is used for determining that the engine is in an operating condition and detecting a dynamic liquid level value; the liquid level comparison module is used for comparing the dynamic liquid level value with a reference dynamic liquid level value; the execution module is used for executing an engine control strategy for delaying engine oil dilution when the dynamic liquid level values detected for multiple times are higher than the reference dynamic liquid level value by a second set value.
In some embodiments, the liquid level detection module is used for acquiring the oil temperature of the engine; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine.
In some embodiments, the oil level detection module is configured to detect a current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine working condition; and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
In some embodiments, a liquid level detection module to determine that the engine is at a stop condition; detecting the current oil level value; acquiring a compensation value of an engine oil level value corresponding to the engine under a stop working condition; and adding the current oil level value and the compensation value to obtain the static level value.
In some embodiments, the reference liquid level detection module is used for determining that the engine is in a stop condition after being changed by engine oil; continuously detecting the static liquid level value for multiple times; and determining the average value of the static liquid level values for multiple times as the reference static liquid level value.
In some embodiments, the reference oil level detection module is configured to determine that the engine is in an operating condition after oil replacement; continuously detecting the dynamic liquid level value for multiple times; and determining the average value of the dynamic liquid level values for multiple times as the reference dynamic liquid level value.
In some embodiments, the liquid level detection module is configured to determine that the vehicle condition satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃; and acquiring an engine oil level value corresponding to the stop working condition of the engine.
In some embodiments, the liquid level detection module is configured to determine that the vehicle condition satisfies, when the engine is in an operating condition: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
The device for delaying engine oil dilution provided by the embodiment of the invention executes the engine dilution delaying control strategy when the engine oil level values detected for a plurality of times continuously are higher than the reference engine oil level value by a certain value, and can accurately determine the condition of engine oil dilution in the engine oil because the engine oil level values detected for a plurality of times continuously are higher than the reference engine oil level value, thereby effectively delaying the engine oil dilution of the engine.
Yet another embodiment of the present invention provides an electronic device comprising a memory, at least one processor, and an oil level sensor coupled to the processor; the memory for storing a computer program; and the engine oil level sensor is used for detecting the engine oil level value at any time and sending the engine oil level value to the processor. The processor, when executing the computer program, implements a method such as delaying an oil level value based on an oil level value detected by a sensor.
It is understood that, in this embodiment, the electronic device executes the method for delaying the oil level value provided in any one of the examples provided in the first embodiment, and for the sake of brevity of the description, details of the method for delaying the oil level value provided in the first embodiment are not repeated herein.
Yet another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method provided by the first embodiment.
It is to be understood that, in this embodiment, the computer readable storage medium executes the method for delaying the oil level value provided in any one of the examples provided in the first embodiment, and for the sake of brevity of the description, details of the method for delaying the oil level value provided in the first embodiment are not repeated herein.
Another embodiment of the present invention provides a vehicle comprising a memory, at least one processor, and an oil level sensor coupled to the processor; the memory for storing a computer program; the engine oil level sensor is used for detecting the value of the engine oil level value of the engine at any time and sending the data of the engine oil level value to the processor. The processor is configured to, when executing the computer program, implement the method provided in the first embodiment.
It is understood that, in this embodiment, the processor of the vehicle executes the method for delaying the oil level provided in any one of the examples provided in the first embodiment, and for the sake of brevity of the description, the method for delaying the oil level provided in the first embodiment is not described herein again.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or illustrative of the principles of the present application and are not to be construed as limiting the present application. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. Further, it is intended that the appended claims cover all such changes and modifications that fall within the scope and range of equivalents of the appended claims, or the equivalents of such scope and range.
Claims (15)
1. A method of delaying oil dilution, comprising:
acquiring an engine oil level value of an engine;
comparing the oil level value with a reference oil level value, wherein the reference oil level value is obtained after the engine is changed for the latest time;
and when the oil level values obtained continuously for multiple times are higher than the reference oil level value by a set value, executing an engine control strategy for delaying oil dilution.
2. The method of claim 1, wherein said obtaining an oil level value of an engine comprises:
determining the working condition of an engine, wherein the working condition of the engine comprises an engine stopping working condition and an engine running working condition;
the reference engine oil level value corresponding to the working condition of the engine is obtained
And acquiring the engine oil level value of the engine corresponding to the working condition of the engine.
3. The method of claim 2, wherein the executing the engine strategy of delaying oil dilution when the oil level values obtained a plurality of consecutive times are all higher than the baseline oil level value by a set amount comprises:
and when the oil level values obtained continuously for multiple times are higher than the reference oil level value under the corresponding working condition by respective set values, executing an engine control strategy for delaying oil dilution.
4. The method of claim 2, wherein after determining the operating condition of the engine, prior to obtaining an oil level value of the engine corresponding to the operating condition of the engine, further comprising:
obtaining the oil temperature of engine oil;
determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine;
continuing the delay time;
and acquiring the oil level value of the engine.
5. The method of claim 2, wherein said obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises:
detecting the current oil level value;
acquiring a compensation value of an engine oil level value corresponding to the engine working condition;
and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
6. The method of claim 1, wherein obtaining a baseline oil level value after a last engine oil change comprises:
determining the working condition of the engine;
continuously detecting the engine oil level value corresponding to the working condition of the engine for multiple times;
and determining the average value of the oil level values corresponding to the working conditions of the engine for multiple times as a reference oil level value corresponding to the working conditions of the engine.
7. The method of claim 2, wherein obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises:
when the engine is in a stop condition,
determining that the vehicle state satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃;
and acquiring an engine oil level value corresponding to the stop working condition of the engine.
8. The method of claim 2, wherein said obtaining an oil level value of the engine corresponding to an operating condition of the engine comprises:
when the engine is in an operating condition,
determining that the vehicle state satisfies: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃;
and acquiring an engine oil level value corresponding to the operating condition of the engine.
9. An apparatus for delaying oil dilution, comprising:
the liquid level detection module is used for acquiring an engine oil level value of the engine;
the liquid level comparison module is used for comparing the engine oil level value with a reference engine oil level value, wherein the reference engine oil level value is obtained after the engine is changed for the latest time;
and the execution module is used for executing an engine control strategy for delaying engine oil dilution when the engine oil level values obtained continuously and repeatedly are higher than the reference engine oil level value by a set value.
10. The apparatus of claim 9,
the liquid level detection module is used for determining the working condition of the engine, wherein the working condition of the engine comprises an engine stop working condition and an engine running working condition; calling a reference engine oil level value corresponding to the working condition of the engine; and acquiring the engine oil level value of the engine corresponding to the working condition of the engine.
11. The apparatus of claim 10, wherein the execution module is configured to execute the engine control strategy for delaying oil dilution when the oil level values obtained in a plurality of consecutive times are higher than the reference oil level value under the corresponding operating condition by respective set values.
12. The device of claim 10, wherein the liquid level detection module is configured to obtain an oil temperature of the engine; determining delay time corresponding to the working condition of the engine according to the oil temperature of the engine oil of the engine; continuing the delay time; and acquiring the oil level value of the engine.
13. The apparatus of claim 10, wherein the level detection module is configured to detect a current oil level value; acquiring a compensation value of the engine oil liquid level corresponding to the working condition of the engine; and adding the current oil level value and the compensation value to obtain the oil level value of the engine corresponding to the working condition of the engine.
14. The apparatus of claim 10, wherein the liquid level detection module is configured to determine that the vehicle condition satisfies, when the engine is in a stopped condition: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle state meets the condition that the transverse and longitudinal acceleration of the vehicle is between-0.1 g and +0.1g, and the change rate of the transverse and longitudinal acceleration of the vehicle is lower than one or more of 0.01g/10s or the engine oil temperature is between 20 ℃ and 90 ℃; acquiring an engine oil level value corresponding to an engine stop working condition; or the liquid level detection module is used for determining that the vehicle state meets the following conditions when the engine is in the running working condition: the vehicle speed change rate is lower than 0.3km/h/s, the vehicle transverse and longitudinal acceleration is between-0.25 g and +0.25g, and the change rate is lower than one or more of 0.01g/10s or the engine oil temperature is 60-90 ℃; and acquiring an engine oil level value corresponding to the operating condition of the engine.
15. A vehicle comprising a memory and a processor; the memory for storing a computer program; the processor, when executing the computer program, implementing the method of any of claims 1-8.
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