To provide a deterioration estimation device of engine oil capable of inexpensively and accurately estimating deterioration of engine oil, and thereby properly determining replacement time of the engine oil.
This deterioration estimation device of engine oil used for lubrication of an internal combustion engine 3 is provided with: an oxidation prevention performance estimation means 2 estimating oxidation prevention performance OIT of the engine oil; a cleanness maintenance performance estimation means 2 estimating cleanness maintenance performance TBN of the engine oil; and a deterioration estimation means 2 estimating the deterioration of the engine oil based on the estimated oxidation prevention performance and cleanness maintenance performance.
MARUYAMA MASASHI
AIKAWA KOUICHIRO
HOSHIKAWA WATARU
| JPS6165007A | 1986-04-03 | |||
| JPS62203915A | 1987-09-08 | |||
| JPH0331746A | 1991-02-12 |
Next Patent: ESTIMATION DEVICE OF OXIDATION PREVENTION PERFORMANCE OF ENGINE OIL