Patent US5280388A successfully refreshed from Google Patents.
Patent EP0174601A1 successfully refreshed from Google Patents.
EP0174601A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oil degradation warning system
Assignee: Nissan Motor Co Ltd
•
Filing: 1985-09-04
•
Granted: —
•
Expires: 2005-09-04
Abstract
Abstract Herein disclosed is an oil degradation warning system which comprises several sensors (12b,12c,12d) for sensing parameters which are closely related to degradation factors of the engine oil, a microcomputer (16) which processes the detected parameters to compute oil degradation coefficients of them in each factor, integrates the oil degradation coefficients in each factor with passage of time, and issues an instruction signal when at least one of the integrated values of the oil degradation coefficients exceeds a corresponding reference value, and a warning device (20) which gives a warning when the instruction signal is applied thereto.
Inventors
- 👤 Ryuzaburou Inoue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 21:37
CPC Classifications
G; G07; G07C; G07C5/00; G07C5/006; F; F01; F01M; F01M11/00; F01M11/10; F16; F16N; F16N29/00; F16N29/04; F01M2011/14; F01M2250/00; F01M2250/62; F01M2250/64; F16N2200/00; F16N2200/08; F16N2200/12; F16N2230/00; F16N2230/02; F16N2250/00; F16N2250/08; F16N2260/00; F16N2260/02; F16N2260/12; F16N2260/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
An oil degradation warning system comprising: first means for detecting a plurality of parameters which are closely related to degradation factors of the engine oil; second means for processing said parameters to provide oil degradation coefficients of the parameters in each factor and integrating the oil degradation coefficients in each factor with passage of time; third means for issuing an instruction signal when at least one of the integrated values of the oil degration coefficients exceeds a corresponding reference value; and fourth means for giving a warning when said instruction signal is applied thereto.
Claim 2
Dependent Claim
94 words
An oil degradation warning system comprising: first means for detecting a plurality of parameters which are closely related to degradation factors of the engine oil; second means for processing said parameters to provide oil degradation coefficients of the parameters in each factor and integrating the oil degradation coefficients in each factor with passage of time; third means for issuing an instruction signal when at least one of the integrated values of the oil degration coefficients exceeds a corresponding reference value; and fourth means for giving a warning when said instruction signal is applied thereto.
Claim 3
Dependent Claim
53 words
An oil degradation warning system as claimed in Claim 1, in which said first means comprises an oil temperature sensor which senses the temperature of the engine oil, an engine speed sensor which senses the rotation speed of the engine, and an engine load sensor which senses a load applied to the engine.
Claim 4
Dependent Claim
33 words
An oil degradation warning system as claimed in Claim 2, in which the oil degradation parameters are the viscosity of oil, the basicity of oil and the mount of infusible matters in oil.
Claim 5
Dependent Claim
33 words
An oil degradation warning system as claimed in Claim 3, further comprising fifth means which resets the integrated values of the oil degradation coefficients to zero when oil change is practically carried out.
Claim 6
Dependent Claim
40 words
An oil degradation warning system as claimed in Claim 4, further comprising sixth means which judges whether or not a predetermined time passes after said fifth means completes its work as to resetting the integrated values of the degradation coefficients.
Claim 7
Dependent Claim
29 words
An oil degradation warning system as claimed in Claim 5, further comprising seventh means which initializes a memory when an ignition switch of the associated engine is turned on.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.