Method of determining engine racing and method of preventing...

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

F - Mech Eng,Light,Heat,Weapons

16

H

74/159, 354/23

F16H 61/04 (2006.01) F16H 59/46 (2006.01) F16H 61/00 (2006.01) F16H 61/02 (2006.01) F16H 61/08 (2006.01)

Patent

CA 1313778

ABSTRACT OF THE DISCLOSURE 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.

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