Apparatus for detecting a neutral state of a transmission gear o

Details Apparatus for detecting a neutral state of a transmission gear o Apparatus for detecting a neutral state of a transmission gear o

1987-01-13

1989-02-14

Staab, Lawrence

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74872, B60K 4108

Patent

active

048038989

ABSTRACT:
An apparatus for detecting a neutral state of a transmission gear of a vehicle detects an engine rotational speed, a vehicle speed, and a condition in which the engine output power is transmitted to the transmission gear through a clutch. The apparatus judges that the transmission gear is in the neutral state when a ratio between the engine rotational speed and the vehicle speed is in any one of predetermined ranges. The apparatus also judges that the transmission gear is in the neutral state when a variation of the ratio between the engine rotational speed and the vehicle speed within a predetermined time period is greater than a predetermined value.

REFERENCES:
patent: 3707892 (1973-01-01), Kuroda et al.
patent: 4165722 (1979-08-01), Aoyama
patent: 4257381 (1981-03-01), Yuzawa et al.
patent: 4401073 (1983-08-01), Furuhashi
patent: 4481844 (1984-11-01), Ironside et al.
patent: 4508088 (1985-04-01), Hasegawa et al.
patent: 4596164 (1986-06-01), Hasegawa et al.
patent: 4685548 (1987-08-01), Holtermann et al.

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