CN111396171B - Calculation method for engine oil dilution - Google Patents
Calculation method for engine oil dilution Download PDFInfo
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- CN111396171B CN111396171B CN202010234606.7A CN202010234606A CN111396171B CN 111396171 B CN111396171 B CN 111396171B CN 202010234606 A CN202010234606 A CN 202010234606A CN 111396171 B CN111396171 B CN 111396171B
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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
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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
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
Abstract
The invention discloses a method for calculating engine oil dilution, which comprises the following steps: (1) calculating the fuel quantity V0(ml) in the engine oil when the engine oil needs to be replaced; (2) outputting an engine oil dilution coefficient according to the rail pressure and MAP of a far-rear fuel injection quantity q, and obtaining a fuel oil increase rate q1(mg/s) in the engine oil in unit time after unit conversion; (3) correcting the environmental factors to obtain the increase rate a q1(ml/s) of the fuel oil in the engine oil after the environmental factors are corrected; (4) correcting the EGR rate, and obtaining the fuel oil increasing rate q2(ml/s) corrected by the EGR rate after unit conversion; (5) correcting fuel volatilization, and taking out the evaporation rate q3(ml/s) of the fuel in unit time; (6) the fuel oil increase rate in the engine oil per unit time is Q ═ a × Q1+ Q2-Q3 (ml/s); (7) integrating Q through time to obtain the fuel content V1(ml) in the engine oil; (8) when V1> V0, a reminder to change oil is displayed on the meter. Compared with the prior art, the invention has the advantages that: low cost and good use effect.
Description
Technical Field
The invention relates to the technical field of engine oil, in particular to a method for calculating engine oil dilution.
Background
At present, the remote post-injection regeneration technology generally adopted by light vehicles is that diesel oil sprayed out from a fuel injector by remote post-injection does not participate in combustion in a cylinder, stays in the cylinder for a period of time and is discharged into a DOC (diesel engine) for post-treatment through an exhaust valve along with waste gas, and reacts with oxygen in the DOC to release heat to raise the front temperature of a DPF (diesel particulate filter) so as to achieve the purpose of regeneration. Because the ECU (electronic control unit) does not have the logic of engine oil dilution, the ECU can only convert the engine oil dilution test results into oil change mileage according to the engine oil dilution test results in various environments (factors such as altitude and air temperature), and then the engine oil is changed by taking the minimum oil change mileage. When the method is used, not only the factors causing engine oil dilution are not distinguished, the use conditions of users cannot be distinguished in the engine oil replacing period, including the operation working conditions (cargo carrying capacity and vehicle speed), the environmental conditions (altitude and air temperature), the aftertreatment regeneration duration and the regeneration frequency, the engine oil is replaced by the minimum oil replacing mileage, the use cost of the users is increased, and although the diesel oil is not involved in the combustion in the cylinder after being sprayed into the cylinder, a part of the diesel oil is attached to the cylinder wall and flows to the oil pan through the gap between the cylinder wall and the piston, the engine oil dilution rate is improved, the viscosity value of the engine oil is reduced due to the fact that the engine oil is mixed into the diesel oil, the lubricating performance of the engine oil and the service life of the engine oil are affected, the performance of the diesel engine is further affected, the service life of the diesel engine is shortened, meanwhile, the users cannot.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a method for calculating the dilution of the engine oil, which has low cost and good use effect.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for calculating the dilution of engine oil comprises the following steps:
(1) calculating the fuel quantity V0(ml) in the engine oil when the engine oil needs to be replaced according to the engine oil replacing index given by the lubricating oil company and the total engine oil filling quantity;
(2) outputting an engine oil dilution coefficient according to the MAP of the rail pressure and the far-back oil injection quantity q, multiplying the far-back oil injection quantity q to obtain the basic fuel oil quantity in the engine oil, and obtaining the fuel oil increase rate q1(mg/s) in the engine oil in unit time after unit conversion;
(3) carrying out environmental factor correction, and multiplying the fuel increase rate q1 by a coefficient a taken out by the corrected MAP of the environmental pressure and the environmental temperature to obtain the increase rate a q1(ml/s) of the fuel in the engine oil after the environmental factor correction;
(4) correcting the EGR rate, taking out a correction coefficient according to the MAP of the EGR rate and the far back oil injection quantity q, multiplying the correction coefficient by the far back oil injection quantity q, and obtaining the fuel oil increase rate q2(ml/s) corrected by the EGR rate after unit conversion;
(5) correcting fuel oil volatilization, and taking out a fuel oil evaporation rate q3(ml/s) in unit time according to the accumulated running time after engine oil replacement and the water temperature MAP;
(6) the fuel oil increase rate in the engine oil per unit time is Q ═ a × Q1+ Q2-Q3 (ml/s);
(7) integrating the fuel increase rate Q in the engine oil per unit time by time to obtain the fuel content V1(ml) in the engine oil;
(8) when V1> V0, a reminder to change oil is displayed on the meter.
Compared with the prior art, the invention has the advantages that: according to the method for calculating the engine oil dilution, the calculation logic of the ECU is updated, only the influence factors of the engine oil dilution and the vehicle use conditions are used as input quantities, and through the calculation of software, a user can be reminded to replace the engine oil when the engine oil dilution reaches the limit value, so that the use effect is improved, and the user cost can be saved; the calculation method for diluting the engine oil caused by DPF regeneration through far-back spraying in the cylinder reduces the dilution rate of the engine oil, the viscosity value of the engine oil cannot be reduced when the engine oil is mixed into diesel oil, the lubricating performance of the engine oil and the service life of the engine oil cannot be influenced, and the use effect is improved.
As an improvement, the larger the rail pressure in the step (2), the more severe the engine oil dilution.
As an improvement, the greater the amount q of far and after oil injection accumulated in the step (2), the more serious the engine oil dilution rate.
As an improvement, the greater the EGR rate in said step (4), the more the engine oil is diluted.
As an improvement, the higher the temperature of the engine oil in the step (5), the faster the diesel oil volatilizes, and the lower the dilution rate of the engine oil is as time is accumulated.
As an improvement, after engine oil is replaced, the diagnostic instrument can be used for clearing the fuel dilution quantity and the accumulated running time accumulated in the ECU.
Drawings
FIG. 1 is a total calculation logic diagram of a calculation method for engine oil dilution according to the present invention.
FIG. 2 is a MAP value and calculation logic diagram of a calculation method for engine oil dilution according to the present invention.
FIG. 3 is a logic diagram of ECU unit conversion of the calculation method of engine oil dilution according to the present invention.
FIG. 4 is a logic diagram of a diluted fuel quantity calculation according to a method for calculating engine oil dilution according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A method for calculating the dilution of engine oil comprises the following steps:
(1) calculating the fuel quantity V0(ml) in the engine oil when the engine oil needs to be replaced according to the engine oil replacing index given by the lubricating oil company and the total engine oil filling quantity;
(2) outputting an engine oil dilution coefficient according to the MAP of the rail pressure and the far-back oil injection quantity q, multiplying the far-back oil injection quantity q to obtain the basic fuel oil quantity in the engine oil, and obtaining the fuel oil increase rate q1(mg/s) in the engine oil in unit time after unit conversion;
(3) carrying out environmental factor correction, and multiplying the fuel increase rate q1 by a coefficient a taken out by the corrected MAP of the environmental pressure and the environmental temperature to obtain the increase rate a q1(ml/s) of the fuel in the engine oil after the environmental factor correction;
(4) correcting the EGR rate, taking out a correction coefficient according to the MAP of the EGR rate and the far back oil injection quantity q, multiplying the correction coefficient by the far back oil injection quantity q, and obtaining the fuel oil increase rate q2(ml/s) corrected by the EGR rate after unit conversion;
(5) correcting fuel oil volatilization, and taking out a fuel oil evaporation rate q3(ml/s) in unit time according to the accumulated running time after engine oil replacement and the water temperature MAP;
(6) the fuel oil increase rate in the engine oil per unit time is Q ═ a × Q1+ Q2-Q3 (ml/s);
(7) integrating the fuel increase rate Q in the engine oil per unit time by time to obtain the fuel content V1(ml) in the engine oil;
(8) when V1> V0, a reminder to change oil is displayed on the meter.
The larger the rail pressure in the step (2), the more serious the engine oil dilution is.
And (3) the greater the accumulated far-rear oil injection quantity q in the step (2), the more serious the engine oil dilution rate is.
The greater the EGR rate in said step (4), the more severe the engine oil dilution.
In the step (5), the higher the temperature of the engine oil is, the faster the diesel oil volatilizes, and the lower the dilution rate of the engine oil is along with the accumulation of time.
After the engine oil is replaced, the diagnostic instrument can be used for clearing the fuel oil dilution quantity accumulated and calculated in the ECU and the accumulated running time.
TABLE 1 calculation of variables input for oil dilution
In specific implementation, the total calculation logic diagram of the calculation method of engine oil dilution shown in fig. 1, the MAP value and calculation logic diagram of the calculation method of engine oil dilution shown in fig. 2, the ECU unit conversion logic diagram of the calculation method of engine oil dilution shown in fig. 3, the diluted fuel quantity calculation logic diagram of the calculation method of engine oil dilution shown in fig. 4 and the variables required to be input in the calculation of engine oil dilution shown in table 1 are combined, when the calculation method of engine oil dilution is used, the variables and the influence relationship influencing engine oil dilution in table 1 are firstly written into the ECU, the total calculation logic diagram of the calculation method of engine oil dilution shown in fig. 1 can be obtained, and the engine oil dilution degree can be calculated along with the use conditions and the use time of a vehicle. According to the variables and the influence relation influencing the dilution of the engine oil, the greater the oil quantity injected far later, the more serious the dilution of the engine oil, the greater the accumulated oil quantity q injected far later, and the more serious the dilution rate of the engine oil; the larger the rail pressure is, the more the injected diesel oil is attached to the cylinder wall, and the more the engine oil is diluted; the oil jet is longer when the elevation is higher under the same rail pressure, the oil jet is more attached to the cylinder wall, and the engine oil is more seriously diluted; the greater the EGR rate (especially during the regeneration phase), the more severe the engine oil dilution; the higher the oil temperature, the faster the diesel oil volatilizes and, as time accumulates, the lower the oil dilution rate. After the algorithm is written into the ECU, the ECU can calculate the current engine oil dilution rate according to the relevant input quantity in the use process of the vehicle, so that a user can be reminded to replace the engine oil when the engine oil dilution reaches the limit value, the use effect is improved, the engine oil does not need to be replaced by the minimum oil change mileage, and the user cost can be saved. The ECU unit conversion logic diagram of the calculation method for the engine oil dilution in the attached figure 3 is that the unit of oil is converted from mg/Hub to ml/s, which is convenient for a user to check and improves the use effect. The calculation method for diluting the engine oil caused by DPF regeneration through far-back spraying in the cylinder reduces the dilution rate of the engine oil, the viscosity value of the engine oil cannot be reduced when the engine oil is mixed into diesel oil, the lubricating performance of the engine oil and the service life of the engine oil cannot be influenced, and the use effect is improved. Therefore, the calculation method for the engine oil dilution is low in cost and good in using effect.
Claims (6)
1. A method for calculating the dilution of engine oil is characterized by comprising the following steps:
(1) calculating the fuel quantity V0(ml) in the engine oil when the engine oil needs to be replaced according to the engine oil replacing index given by the lubricating oil company and the total engine oil filling quantity;
(2) outputting an engine oil dilution coefficient according to the MAP of the rail pressure and the far-back oil injection quantity q, multiplying the far-back oil injection quantity q to obtain the basic fuel oil quantity in the engine oil, and obtaining the fuel oil increase rate q1(mg/s) in the engine oil in unit time after unit conversion;
(3) carrying out environmental factor correction, and multiplying the fuel increase rate q1 by a coefficient a taken out by the corrected MAP of the environmental pressure and the environmental temperature to obtain the increase rate a q1(ml/s) of the fuel in the engine oil after the environmental factor correction;
(4) correcting the EGR rate, taking out a correction coefficient according to the MAP of the EGR rate and the far back oil injection quantity q, multiplying the correction coefficient by the far back oil injection quantity q, and obtaining the fuel oil increase rate q2(ml/s) corrected by the EGR rate after unit conversion;
(5) correcting fuel oil volatilization, and taking out a fuel oil evaporation rate q3(ml/s) in unit time according to the accumulated running time after engine oil replacement and the water temperature MAP;
(6) the fuel oil increase rate in the engine oil per unit time is Q ═ a × Q1+ Q2-Q3 (ml/s);
(7) integrating the fuel increase rate Q in the engine oil per unit time by time to obtain the fuel content V1(ml) in the engine oil;
(8) when V1> V0, a reminder to change oil is displayed on the meter.
2. The method for calculating the dilution of engine oil according to claim 1, wherein the method comprises the following steps: the larger the rail pressure in the step (2), the more serious the engine oil dilution is.
3. The method for calculating the dilution of engine oil according to claim 1, wherein the method comprises the following steps: and (3) the greater the accumulated far-rear oil injection quantity q in the step (2), the more serious the engine oil dilution rate is.
4. The method for calculating the dilution of engine oil according to claim 1, wherein the method comprises the following steps: the greater the EGR rate in said step (4), the more severe the engine oil dilution.
5. The method for calculating the dilution of engine oil according to claim 1, wherein the method comprises the following steps: in the step (5), the higher the temperature of the engine oil is, the faster the diesel oil volatilizes, and the lower the dilution rate of the engine oil is along with the accumulation of time.
6. The method for calculating the dilution of engine oil according to claim 1, wherein the method comprises the following steps: after the engine oil is replaced, the diagnostic instrument can be used for clearing the fuel oil dilution quantity accumulated and calculated in the ECU and the accumulated running time.
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| CN112414717B (en) * | 2020-10-29 | 2023-02-28 | 一汽解放汽车有限公司 | Test method for engine oil dilution by post-injection fuel oil of engine |
| CN115370446B (en) * | 2022-08-24 | 2023-09-01 | 东风商用车有限公司 | Method, device, equipment and storage medium for judging vehicle engine oil replacement period |
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| JP2009150293A (en) * | 2007-12-20 | 2009-07-09 | Mitsubishi Fuso Truck & Bus Corp | Oil dilution amount monitoring method and device for internal combustion engine |
| DE102009046075B4 (en) * | 2009-10-28 | 2011-06-30 | Ford Global Technologies, LLC, Mich. | Method for determining the proportion of heavy diesel components in a dilute engine oil |
| JP5505151B2 (en) * | 2010-07-13 | 2014-05-28 | トヨタ自動車株式会社 | Oil dilution fuel estimation device |
| FR2974853B1 (en) * | 2011-05-06 | 2015-05-01 | Renault Sa | METHOD OF ESTIMATING DILUTION OF FUEL IN THE OIL OF AN INTERNAL COMBUSTION ENGINE |
| CN107524493B (en) * | 2017-09-07 | 2019-10-29 | 台州滨海吉利发动机有限公司 | A kind of method and device controlling lubricating oil emulsion and fuel dilution |
| CN110886635B (en) * | 2018-09-06 | 2021-01-29 | 北京福田康明斯发动机有限公司 | Method and device for evaluating engine oil dilution level of engine |
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