System for and method of controlling shifting in gear position i

Details System for and method of controlling shifting in gear position i System for and method of controlling shifting in gear position i

1989-04-11

1991-06-11

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

B60K 4106

Patent

active

050222864

ABSTRACT:
An automatic transmission with a downshift control is disclosed. Upon deceleration, the downshift is effected to cause engine brake running with downshifted state to take place. When the driver depresses an accelertator pedal to open the engine throttle, i.e., a power demand, the engine brake running with downshifted state is to be released but with a predetermined delay time. More specifically, the engine brake running with downshifted state is released upon expiration of the predetermined delay time after the power demand has been detected. In the second embodiment, the release timing is more precisely controlled such that the delayed release becomes moot when the power demand disappears, so that the downshifted state is immediately released when the accelerator pedal is released after it has been depressed.

REFERENCES:
patent: 4041809 (1977-08-01), Dick et al.
patent: 4253346 (1981-03-01), Kuhnle
patent: 4412290 (1983-10-01), Pannier
patent: 4456107 (1984-06-01), Ito et al.
patent: 4457410 (1984-07-01), Suga et al.
patent: 4463822 (1984-08-01), Tanigawa et al.
patent: 4551802 (1985-11-01), Smyth
patent: 4671139 (1987-06-01), Downs et al.
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4730519 (1988-03-01), Nakamura et al.
patent: 4823646 (1989-04-01), Yoshimura et al.
Service Manual, Nissan Full-Range Electronically Controlled Automatic Transmission of RE4R01A Type, 1987 (A261C07), issued by Nissan Motor Company, Limited in Mar. 1987.
Japanese Service Manual for Automatic Transmission Types L4N71B and E4N71B, Nissan Motor Company Limited, Nov., 1982.

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