Control systems for vehicle engines coupled with automatic trans

Details Control systems for vehicle engines coupled with automatic trans Control systems for vehicle engines coupled with automatic trans

1989-05-23

1992-02-25

Lall, Parshotam S.

Boots, shoes, and leggings

36443103, 74866, B60K 4104

Patent

active

050918540

ABSTRACT:
A control system for a vehicle engine coupled with an automatic transmission, which comprises a detecting portion for detecting a condition of speed change operation in the automatic transmission, a speed sensor for detecting engine speed or turbine speed in the automatic transmission, a first period determining portion for determing a first period of time, in which the speed change operation is to be carried out, by calculation based on the speed detected by the speed sensor, a second period determining portion for determining a second period of time, in which the speed change operation is to be carried out, in accordance with a predetermined lapse of time after the condition of the speed change operation is selected, and a torque control portion operative to vary torque produced by the vehicle engine to suppress torque shock resulting from the speed change operation during the first period of time when a condition of shifting-up operation is detected by the detecting portion and to vary the torque so as to suppress torque shock resulting from the speed change operation during the second period of time when a condition of predetermined shifting-down operation is detected by the detecting portion.

REFERENCES:
patent: 4226141 (1980-10-01), Espenschied
patent: 4266447 (1981-05-01), Hees et al.
patent: 4355550 (1982-10-01), Will et al.
patent: 4370903 (1983-02-01), Stroh et al.
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patent: 4680988 (1987-07-01), Mori
patent: 4691285 (1987-09-01), Takeda
patent: 4744031 (1988-05-01), Takeda et al.
patent: 4770064 (1988-09-01), Kuerschner
patent: 4811223 (1989-03-01), Iwatsuki et al.

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