CN112580197B - Engine oil life estimation method and device - Google Patents
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Abstract
The invention relates to an engine oil life estimation method, which comprises the following steps: calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the duration of the cooling working condition; calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration of the thermal working condition; accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value; and comparing the engine oil aging accumulated value with an engine oil service life threshold, and performing engine oil maintenance early warning according to a comparison result. The method respectively calculates the engine oil aging values of the cooling working condition and the hot working condition, and accumulates the engine oil aging values within a set time, so that the actual engine oil aging condition is more accurately mastered.
Description
Technical Field
The invention relates to the field of vehicle engine maintenance systems, in particular to a method and a device for estimating the service life of engine oil.
Background
Currently, vehicle engine maintenance is the basis for maintenance, and the quality of the engine oil and/or the lubricating efficiency of the engine oil determine the service life and power performance of the engine. Under the condition of vehicle operation, the vehicle is probably in a medium-high temperature operation (namely a hot working condition) and a low-temperature circulation state (a cooling working condition) of stopping running, and the engine oil shows different circulation conditions from the medium-high temperature long-time operation circulation condition of a bench test under the circulation action of the hot working condition and the cooling working condition. When the vehicle is cold started each time, the ambient temperature of the vehicle can be greatly different, in winter in the north, engine oil is in a semi-solidified state when the engine is in a cold state, and in summer in the south, the engine is in a water absorption state. These conditions have different effects on the ageing of the oil and on the lubrication of the engine.
In the related art, the engine oil is monitored in real time simply, and information such as the temperature of the engine oil, the temperature of cooling liquid, the temperature of environment and the like is displayed on an instrument when an alarm is given. And effective statistics and judgment are lacked for various actual engine oil aging accumulation conditions, and especially the aging of the engine oil under a cold working condition is ignored, so that the actual aging change condition of the engine oil cannot be accurately mastered to give more accurate early warning information.
Disclosure of Invention
The embodiment of the invention provides an engine oil life estimation method and device, which can accurately master the actual aging condition of engine oil by respectively calculating the engine oil aging values of a cooling working condition and a hot working condition and accumulating the engine oil aging values in a set time.
In a first aspect, a method for estimating a lifetime of engine oil is provided, which includes:
calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the duration of the cooling working condition; calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration of the thermal working condition; accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value; and comparing the engine oil aging accumulated value with an engine oil service life threshold, and performing engine oil maintenance early warning according to a comparison result.
In some embodiments, the calculating the first engine oil aging value corresponding to the cooling condition according to the engine oil temperature and the cooling condition duration includes: determining the duration of the cooling condition; obtaining the temperature of the engine oil under a cooling working condition; and obtaining a first engine oil aging value according to the preset duration of the cooling working condition and the corresponding relation between the engine oil temperature and the engine oil aging value under the cooling working condition.
In some embodiments, the obtaining the temperature of the engine oil under the cooling condition includes: acquiring temperature data from a coolant sensor; and taking the temperature data as the engine oil temperature under the cooling working condition.
In some embodiments, the obtaining the temperature of the engine oil in the cooling condition includes: determining the starting time and the duration of the cooling working condition; calculating the temperature of the cooling liquid under the cooling working condition according to a first formula; the first formula is: t (T) = (T (0) -Ti) e -kt Wherein T is the duration of the cooling condition, T (T) is the engine oil temperature under the cooling condition,t (0) is the engine oil temperature at the starting moment of the cooling working condition, ti is the ambient temperature, e is a natural constant, and k is the cooling coefficient.
In some embodiments, the calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration of the thermal working condition includes: determining the duration of the thermal working condition; obtaining the engine oil temperature under the hot working condition; and obtaining a second engine oil aging value according to the preset duration of the thermal working condition and the corresponding relation between the engine oil temperature and the engine oil aging value under the thermal working condition.
In some embodiments, the accumulating the first oil aging value and the second oil aging value within the set time range according to a preset algorithm to obtain an oil aging accumulated value includes: recording a thermal working condition and a cooling working condition which are adjacent as a temperature cycle interval; calculating the engine oil aging value corresponding to the temperature cycle interval according to the first engine oil aging value corresponding to the cooling working condition and the second engine oil aging value corresponding to the thermal working condition; and integrating the engine oil aging values corresponding to all the temperature cycle intervals within a set time range to obtain an engine oil aging integrated value.
In some embodiments, the comparing the oil aging integrated value with an oil life threshold and performing an oil maintenance warning according to the comparison result includes: if the engine oil aging accumulated value is larger than the engine oil service life threshold, judging that an engine oil maintenance condition is reached and sending an engine oil maintenance early warning signal; and if the engine oil aging accumulated value is smaller than or equal to the engine oil life threshold, continuously calculating the engine oil aging accumulated value according to the next cooling working condition and the thermal working condition.
In some embodiments, said continuing to calculate the oil aging integrated value based on the next cooling condition and the thermal operating condition comprises: calculating a first engine oil aging value corresponding to the next cooling working condition; calculating a second engine oil aging value corresponding to the next thermal working condition; and fusing and accumulating the engine oil aging value corresponding to the next cooling working condition and the engine oil aging value corresponding to the next thermal working condition to the previous engine oil aging accumulated value.
In a second aspect, there is provided an engine oil life estimation apparatus, including: the cooling working condition engine oil aging calculation module is used for calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the cooling working condition duration; the thermal working condition engine oil aging calculation module is used for calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration time of the thermal working condition; the engine oil aging value accumulation module is used for accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value; and the engine oil maintenance early warning judgment module is used for comparing the engine oil aging accumulated value with an engine oil service life threshold value and carrying out engine oil maintenance early warning according to a comparison result.
In some embodiments, the engine oil life estimation device is in communication with a vehicle signal acquisition module; the vehicle signal acquisition module is used for acquiring a vehicle running state signal and sending the vehicle running state signal to the engine oil life estimation device; the vehicle operating condition signals include engine speed, ambient temperature, oil temperature, and temperature data obtained from a coolant sensor.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides an engine oil service life estimation method, which considers the aging problem of engine oil under two different working conditions of a cooling working condition and a thermal working condition of an engine, respectively calculates a first engine oil aging value corresponding to the cooling working condition and a second engine oil aging value corresponding to the thermal working condition, and accumulates the first engine oil aging value and the second engine oil aging value according to a preset algorithm in a preset time range, thereby obtaining an engine oil aging accumulated value, accurately mastering the actual condition of engine oil aging and providing more accurate engine oil aging maintenance early warning for customers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for estimating a lifetime of an engine oil according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an engine oil life estimation device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for estimating a lifetime of engine oil, which includes the steps of:
s10, calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the duration of the cooling working condition;
s20, calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration time of the thermal working condition;
s30, accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value;
and S40, comparing the engine oil aging accumulated value with an engine oil service life threshold, and carrying out engine oil maintenance early warning according to the comparison result.
It should be noted that the cooling condition in step S10 refers to that the vehicle is in a low-temperature cycle state of stopping, and the cooling condition may be confirmed by the engine speed, and when the engine speed is 0, it is determined that the vehicle is in the cooling condition. On the contrary, the thermal working condition means that the vehicle is in a running state, and the engine speed is not 0 under the working condition. Therefore, the duration of the cooling operation in step S10 and the duration of the thermal operation in step S20 can be obtained by the engine speed.
It can be understood that the engine speed and the engine oil temperature mentioned in the above steps can be acquired by a vehicle-mounted corresponding sensing device; in some embodiments, vehicle operation data such as an ambient temperature, a GPS position, a coolant temperature, and an engine speed are collected by the onboard controller and sent to the cloud platform, and the cloud platform performs the above steps S10 to S40 according to the received vehicle operation data, so as to accurately predict the oil life and issue an oil maintenance warning.
By the engine oil life estimation method provided by the embodiment, the engine oil aging condition of the engine in the cold working condition period can be brought into the engine oil life estimation, the actual aging process of the engine oil can be calculated by accumulating the first engine oil aging value and the second engine oil aging value through the preset algorithm, and the accuracy of judging the engine oil life is improved.
In some embodiments, step S10 comprises:
s101: determining the duration of the cooling condition;
s102: obtaining the temperature of the engine oil under a cooling working condition;
s103: and obtaining a first engine oil aging value according to the preset duration of the cooling working condition and the corresponding relation between the engine oil temperature and the engine oil aging value under the cooling working condition.
It should be noted that the duration of the cooling condition in step S101 is the duration that the engine speed is 0; the engine oil temperature under the cooling condition in the step S102 can be obtained through corresponding vehicle-mounted sensing equipment; the correspondence between the preset duration of the cooling condition, the engine oil temperature under the cooling condition, and the engine oil aging value in step S103 may be a cooling condition engine oil aging evaluation table as shown in table one.
Watch 1
As shown in the table I, when the duration time T is less than a hours and the engine oil temperature x is less than T1 ℃, the corresponding engine oil aging value is 0.1, namely the first engine oil aging value obtained under the working condition.
It should be noted that a in table i is smaller than b, T1 is smaller than T2, and both are preset values.
In some embodiments, step S102 includes:
s102a: acquiring temperature data from a coolant sensor;
s102b: and taking the temperature data as the engine oil temperature under the cooling working condition.
It should be noted that the temperature data obtained by the coolant sensor is used as the oil temperature under the cooling condition, because most engines are not provided with a separate oil temperature sensor, and the coolant temperature is used as a reference index of the oil temperature. The metal cylinder is a good thermal conductor, and the temperature of the cooling liquid is rapidly close to that of the engine oil, and is finally cooled by the ambient temperature at the same time.
In some embodiments, step S102 includes:
s102c: determining the starting time and the duration of the cooling working condition;
s102d: calculating the temperature of the cooling liquid under the cooling working condition according to a first formula;
s102e: the first formula is: t (T) = (T (0) -Ti) e -k T, wherein T is the duration of the cooling condition, T (T) is the engine oil temperature under the cooling condition, T (0) is the engine oil temperature at the starting moment of the cooling condition, ti is the ambient temperature, e is a natural constant, and k is the cooling coefficient.
It should be noted that when the engine is in the cooling condition, the vehicle circuit may be in a power-off state, so that the cloud platform cannot acquire temperature data from the coolant sensor. At the moment, the engine oil temperature at the starting moment of the cooling working condition is the temperature data acquired from the cooling liquid sensor at the last time when the vehicle is stopped and the power is off, and the engine oil temperature under the cooling working condition is obtained through calculation by a first formula.
In the cooling working condition, the temperature data of the cooling liquid sensor cannot be obtained in time due to power failure, and the engine oil aging condition in the period cannot be brought into the engine oil life evaluation.
In some embodiments, step S20 comprises:
s201: determining the duration of the thermal working condition;
s202: obtaining the engine oil temperature under the hot working condition;
s203: and obtaining a second engine oil aging value according to the preset duration of the thermal working condition and the corresponding relation between the engine oil temperature and the engine oil aging value under the thermal working condition.
It should be noted that the duration of the hot working condition in step S201 is the duration that the engine speed is not 0; in step S202, during the hot working condition, the engine oil temperature may be 20 degrees after the temperature data of the coolant sensor, i.e. the coolant temperature +20 degrees. The preset duration of the thermal working condition, the engine oil temperature under the thermal working condition, and the engine oil aging value in step S203 may be the engine oil aging evaluation table of the thermal working condition as shown in table two.
Watch 2
As shown in table two, when the duration time t is less than a hours and the engine oil temperature x is less than c degrees, the corresponding engine oil aging value is 0.2, which is the second engine oil aging value obtained under the working condition.
It should be noted that a is smaller than b, c is smaller than d, and both are preset values.
In some embodiments, step S30 includes:
s301: recording a heat working condition and a cooling working condition which are adjacent as a temperature cycle interval;
s302: calculating an engine oil aging value corresponding to the temperature cycle interval according to the first engine oil aging value corresponding to the cooling working condition and the second engine oil aging value corresponding to the thermal working condition;
s303: and integrating the engine oil aging values corresponding to all the temperature circulation intervals within a set time range to obtain an engine oil aging integrated value.
It can be understood that the engine oil aging process is composed of a plurality of temperature cycle sections, and each temperature cycle section is composed of a thermal working condition and a cooling working condition which are adjacent to each other. Whether the engine is in a hot working condition or a cooling working condition can be judged according to whether the rotating speed of the engine is 0 or not. Therefore, when the rotating speed of the engine is 0, the rotating speed is recorded as the starting point of the cooling working condition, the first engine oil aging value corresponding to the cooling working condition is calculated until the rotating speed of the engine begins to rise from 0, the cooling working condition is finished and immediately enters the thermal working condition, the second engine oil aging value corresponding to the thermal working condition begins to be calculated, and the first engine oil aging value and the second engine oil aging value obtained in the period are accumulated to obtain the engine oil aging value in a temperature cycle interval.
It should be noted that, in some embodiments, the time when the vehicle stops communicating with the cloud platform after power failure may also be used as the starting point for determining the cooling condition. In step S303, the engine oil aging values corresponding to all the temperature cycle sections within the set time range are accumulated, and accumulated statistics may be performed by a rain flow counting method.
In some embodiments, step S40 comprises:
s401: if the engine oil aging accumulated value is larger than the engine oil service life threshold, judging that an engine oil maintenance condition is reached and sending an engine oil maintenance early warning signal;
s402: and if the engine oil aging accumulated value is smaller than or equal to the engine oil life threshold, continuously calculating the engine oil aging accumulated value according to the next cooling working condition and the thermal working condition.
In some embodiments, step S402 includes:
s402a: calculating a first engine oil aging value corresponding to the next cooling working condition;
s402b: calculating a second engine oil aging value corresponding to the next thermal working condition;
s402c: and fusing the engine oil aging value corresponding to the next cooling working condition and the engine oil aging value corresponding to the next thermal working condition and accumulating the fused engine oil aging values to the previous engine oil aging accumulated value.
As shown in fig. 2, an embodiment of the present invention provides an engine oil life estimation apparatus, including: the cooling working condition engine oil aging calculation module is used for calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the cooling working condition duration; the thermal working condition engine oil aging calculation module is used for calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration time of the thermal working condition; the engine oil aging value accumulation module is used for accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value; and the engine oil maintenance early warning judgment module is used for comparing the engine oil aging accumulated value with an engine oil service life threshold value and carrying out engine oil maintenance early warning according to a comparison result.
As shown in FIG. 2, in some embodiments the oil life estimation device communicates with a vehicle signal acquisition module; the vehicle signal acquisition module is used for acquiring a vehicle running state signal and sending the vehicle running state signal to the engine oil life estimation device; the vehicle operating condition signals include engine speed, ambient temperature, oil temperature, and temperature data obtained from a coolant sensor.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method of estimating a lifetime of an engine oil, comprising:
calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the duration of the cooling working condition;
calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration of the thermal working condition;
accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value;
comparing the engine oil aging accumulated value with an engine oil service life threshold, and performing engine oil maintenance early warning according to a comparison result;
the cooling working condition and the hot working condition are confirmed according to the rotating speed of the engine, when the rotating speed of the engine is 0, the cooling working condition is judged to be in, and when the rotating speed of the engine is not 0, the hot working condition is judged to be in;
the first engine oil aging value corresponding to the cooling working condition is calculated according to the engine oil temperature and the cooling working condition duration, and the method comprises the following steps:
determining the duration of the cooling condition;
obtaining the temperature of the engine oil under a cooling working condition;
obtaining a first engine oil aging value according to the corresponding relation between the preset duration time of the cooling working condition, the engine oil temperature under the cooling working condition and the engine oil aging value;
the obtaining of the engine oil temperature under the cooling working condition comprises:
determining the starting time and the duration of the cooling working condition;
calculating the temperature of the cooling liquid under the cooling working condition according to a first formula;
the first formula is: t (T) = (T (0) -Ti) e -kt ，
Wherein T is the duration of the cooling condition, T (T) is the engine oil temperature under the cooling condition, T (0) is the engine oil temperature at the starting moment of the cooling condition, ti is the ambient temperature, e is a natural constant, and k is the cooling coefficient.
2. The method of claim 1, wherein the engine oil life is estimated,
the engine oil temperature under the cooling working condition is obtained, and the method comprises the following steps:
acquiring temperature data from a coolant sensor;
and taking the temperature data as the engine oil temperature under the cooling working condition.
3. The method of claim 1,
the second engine oil aging value corresponding to the thermal working condition is calculated according to the engine oil temperature and the duration time of the thermal working condition, and the method comprises the following steps:
determining the duration of the thermal working condition;
obtaining the engine oil temperature under the hot working condition;
and obtaining a second engine oil aging value according to the preset duration of the thermal working condition and the corresponding relation between the engine oil temperature and the engine oil aging value under the thermal working condition.
4. The method of claim 1,
the method for accumulating the first engine oil aging value and the second engine oil aging value within the set time range according to the preset algorithm to obtain the engine oil aging accumulated value comprises the following steps:
recording a heat working condition and a cooling working condition which are adjacent as a temperature cycle interval;
calculating the engine oil aging value corresponding to the temperature cycle interval according to the first engine oil aging value corresponding to the cooling working condition and the second engine oil aging value corresponding to the thermal working condition;
and integrating the engine oil aging values corresponding to all the temperature cycle intervals within a set time range to obtain an engine oil aging integrated value.
5. The method of claim 1,
comparing the engine oil aging accumulated value with an engine oil life threshold value, and performing engine oil maintenance early warning according to a comparison result, wherein the engine oil maintenance early warning comprises the following steps:
if the engine oil aging accumulated value is larger than the engine oil service life threshold, judging that an engine oil maintenance condition is reached and sending an engine oil maintenance early warning signal;
and if the engine oil aging accumulated value is smaller than or equal to the engine oil life threshold, continuously calculating the engine oil aging accumulated value according to the next cooling working condition and the thermal working condition.
6. The method of claim 5, wherein the engine oil life is estimated,
the continuous calculation of the oil aging accumulated value according to the next cooling working condition and the thermal working condition comprises the following steps:
calculating a first engine oil aging value corresponding to the next cooling working condition;
calculating a second engine oil aging value corresponding to the next thermal working condition;
and fusing and accumulating the engine oil aging value corresponding to the next cooling working condition and the engine oil aging value corresponding to the next thermal working condition to the previous engine oil aging accumulated value.
7. An engine oil life estimation device, characterized by comprising:
the cooling working condition engine oil aging calculation module is used for calculating a first engine oil aging value corresponding to the cooling working condition according to the engine oil temperature and the cooling working condition duration;
the thermal working condition engine oil aging calculation module is used for calculating a second engine oil aging value corresponding to the thermal working condition according to the engine oil temperature and the duration time of the thermal working condition;
the engine oil aging value accumulation module is used for accumulating the first engine oil aging value and the second engine oil aging value within a set time range according to a preset algorithm to obtain an engine oil aging accumulated value;
the engine oil maintenance early warning judgment module is used for comparing the engine oil aging accumulated value with an engine oil service life threshold value and carrying out engine oil maintenance early warning according to a comparison result;
the cooling working condition and the hot working condition are confirmed according to the rotating speed of the engine, when the rotating speed of the engine is 0, the cooling working condition is judged to be in, and when the rotating speed of the engine is not 0, the hot working condition is judged to be in;
the first engine oil aging value corresponding to the cooling working condition is calculated according to the engine oil temperature and the cooling working condition duration, and the method comprises the following steps:
determining the duration of the cooling condition;
obtaining the engine oil temperature under the cooling working condition;
obtaining a first engine oil aging value according to the corresponding relation between the preset duration time of the cooling working condition, the engine oil temperature under the cooling working condition and the engine oil aging value;
the engine oil temperature under the cooling working condition is obtained, and the method comprises the following steps:
determining the starting time and the duration of the cooling working condition;
calculating the temperature of the cooling liquid under the cooling working condition according to a first formula;
the first formula is: t (T) = (T (0) -Ti) e -kt ，
Wherein T is the duration of the cooling condition, T (T) is the engine oil temperature under the cooling condition, T (0) is the engine oil temperature at the starting moment of the cooling condition, ti is the ambient temperature, e is a natural constant, and k is the cooling coefficient.
8. An engine oil life estimation device according to claim 7, wherein said engine oil life estimation device is in communication with the vehicle signal acquisition module;
the vehicle signal acquisition module is used for acquiring a vehicle running state signal and sending the vehicle running state signal to the engine oil life estimation device;
the vehicle operating condition signals include engine speed, ambient temperature, oil temperature, and temperature data obtained from a coolant sensor.
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