Method of evaluating the wear of engine oil taking into account the addition of fresh oil
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-033/26
G01N-011/00
출원번호
US-0221091
(2001-02-15)
우선권정보
DE-0010976 (2000-03-07)
국제출원번호
PCT/DE01/00563
(2001-02-15)
국제공개번호
WO01/67096
(2001-09-13)
발명자
/ 주소
Jakoby, Bernhard
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Kenyon & Kenyon
인용정보
피인용 횟수 :
14인용 특허 :
9
초록▼
A method of evaluating engine oil wear on the basis of viscosity measurement, accounting for the addition of fresh oil. Using an oil viscosity sensor, an amount of fresh oil added is detected, then the oil viscosity sensor determines a viscosity of the oil mixture of the engine oil and fresh oil. A
A method of evaluating engine oil wear on the basis of viscosity measurement, accounting for the addition of fresh oil. Using an oil viscosity sensor, an amount of fresh oil added is detected, then the oil viscosity sensor determines a viscosity of the oil mixture of the engine oil and fresh oil. A quantity of fresh oil added is determined in the electronic analyzer from a difference between the old oil level, i.e., the oil volume, and the new oil level. The viscosity of the fresh oil is determined from the viscosity of the old engine oil immediately before the point in time of the addition of fresh oil and from the viscosity after the addition. A hypothetical initial viscosity is calculated as a new corrected reference value from the known value of the viscosity of the old engine oil in the new condition, the quantity of the engine oil still present at the point in time of the addition, the calculated viscosity of the fresh oil and the calculated quantity of the fresh oil.
대표청구항▼
1. A method of evaluating wear in engine oil based on viscosity measurements, accounting for an addition of fresh oil to aged engine oil using an oil viscosity sensor, an oil level sensor and a connected electronic analyzer having a display device, and determining an aging of the aged engine oil and
1. A method of evaluating wear in engine oil based on viscosity measurements, accounting for an addition of fresh oil to aged engine oil using an oil viscosity sensor, an oil level sensor and a connected electronic analyzer having a display device, and determining an aging of the aged engine oil and determining an oil change interval recommendation resulting therefrom as a reference value by evaluating a change in a prevailing oil viscosity at at least one temperature, in comparison with a viscosity of the fresh oil added at a last oil change, the method comprising:detecting a quantity of oil used in the addition of the fresh oil using the oil level sensor;determining a viscosity of an oil mixture of the aged engine oil and the fresh oil together with a temperature using the oil viscosity sensor at at least one temperature;determining the quantity of the fresh oil added, using the electronic analyzer, from a difference between one of an old oil level and oil volume, and one of a new oil level and oil volume;determining a viscosity of the fresh oil from a viscosity of the aged engine oil immediately before and immediately after the addition of the fresh oil; andcalculating a hypothetical initial viscosity as a new corrected reference value from an initial viscosity of the aged engine oil when new, the oil volume still present at a point in time of the addition, a determined viscosity of the fresh oil, and a determined quantity of fresh oil. 2. The method of claim 1, further comprising:determining a viscosity limit value from the viscosity of the aged engine oil when new by multiplying the initial viscosity by a factor of an admissible increase in viscosity, so that a display of an end of an oil change interval by the display device is triggered when the viscosity limit value is exceeded by the viscosity of the oil mixture measured at a given time at a corresponding temperature value; andobtaining a new limit value from the hypothetical initial viscosity, when adding fresh oil, by multiplying the initial viscosity by the factor. 3. The method of claim 2, wherein the factor has a value greater than 1. 4. The method of claim 2, wherein a mixing rule is used to determine at least one of the calculated viscosity of the fresh oil and the hypothetical initial viscosity of the oil mixture when new as the new corrected reference value. 5. The method of claim 2, wherein at least one indirect influencing factor on the aging of the engine oil is accounted for in the determining the oil change interval. 6. The method of claim 5, wherein the at least one indirect influencing factor includes an oil heating temperature gradient. 7. The method of claim 5, wherein the at least one indirect influencing factor includes at least one of the number of kilometers driven and the number of hours of operation since the last oil change. 8. The method of claim 5, wherein the at least one indirect influencing factor includes at least one of a rotational speed of the engine and an oil temperature characteristic. 9. The method of claim 5, wherein the at least one indirect influencing factor includes a dielectric constant of the engine oil. 10. The method of claim 5, wherein the at least one indirect influencing factor includes a conductivity of the engine oil. 11. The method of in claim 5, wherein the at least one indirect influencing factor includes one of a frequency of cold starts and a load on the vehicle. 12. The method of claim 1, wherein the new corrected reference value is formed by accounting for an additional measured relationship as a reference characteristic. 13. The method of claim 12, wherein the reference characteristic includes a viscosity/temperature characteristic, wherein unmeasured ranges are supplemented by at least one of interpolation and extrapolation.
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이 특허에 인용된 특허 (9)
Steffenhagen Ulrich (Liederbach DEX), Device for temporarily blocking the re-measurement of an electric oil level measurement of a machine, particularly an in.
Braun Fritz (Kernen DEX) Felger Ursula (Schorndorf DEX) Jung Otto (Stuttgart DEX) Wojtacki Jakob (Wendlingen DEX), Method and apparatus for determining and extending a change interval for an operating fluid of a unit.
Discenzo Frederick M. ; Liu Chung-Chiun ; Feke Donald L. ; Dudik Laurie Ann, Micro-viscosity sensor and lubrication analysis system employing the same.
Halalay, Ion C.; Schneider, Eric W.; Olree, Robert M.; Staley, David R., On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils.
Liu,James Z T; Rhodes,Michael L.; Rahman,Aziz, System and method to determine oil quality utilizing a single multi-function surface acoustic wave sensor.
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