Method of determining engine racing and method of preventing eng

Details Method of determining engine racing and method of preventing eng Method of determining engine racing and method of preventing eng

1989-03-02

1991-05-21

Gruber, Felix D.

Boots, shoes, and leggings

74866, G05D 1702, B60K 4108

Patent

active

050180681

ABSTRACT:
Engine racing is determined during shift in an automatic transmission having clutches associated with respective gear positions, by, after a shift command is issued to effect a shift in a power-on mode, detecting the input and output rotational speed ratios of previous-gear-position and next-gear-position clutches of the transmission, and determining that engine racing has occurred if the input and output rotational speed ratio of one of the clutches which is normally greater than 1.0 during a gear shift remains below a threshold value slightly smaller than 1.0 for a predetermined period of time.

REFERENCES:
patent: 3927579 (1975-12-01), Golan
patent: 4073204 (1978-02-01), Dick
patent: 4309919 (1982-01-01), Iwanaga et al.
patent: 4431095 (1984-02-01), Suga
patent: 4457410 (1984-07-01), Suga et al.
patent: 4582182 (1986-04-01), Takeda et al.

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