Automatic transmission auto neutral clutch controls with intermi

Details Automatic transmission auto neutral clutch controls with intermi Automatic transmission auto neutral clutch controls with intermi

1997-03-17

1998-09-08

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Clutch control

With fluid drive

477169, 477174, 477175, F16H 5938, B60K 4122

Patent

active

058038698

ABSTRACT:
A powertrain for a vehicle includes an engine, a multi-speed transmission and control, and output drive mechanisms. The transmission has an electro-hydraulic control for establishing the transmission drive ratios and the interchange therebetween. The ratios are established by a plurality of friction devices, one of which is engaged for the lowest forward ratio. The control has a microcomputer which evaluates vehicle operating parameters and maintains the transmission properly controlled in response to various input signals. The transmission is maintained in an auto neutral condition when the engine is at idle, the transmission output speed is zero, the vehicle brakes are engaged and the forward drive has been selected. The control continually adjusts the pressure in the one friction device to maintain the torque capacity thereof in a range less than full engagement and greater than a minimum value.

REFERENCES:
patent: 5086894 (1992-02-01), Iizuka et al.
patent: 5628706 (1997-05-01), Zhang
patent: 5704871 (1998-01-01), Furukawa et al.
patent: 5725456 (1998-03-01), Fischer et al.
patent: 5738609 (1998-04-01), Jones et al.

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