Hydraulically operated vehicle transmission

Details Hydraulically operated vehicle transmission Hydraulically operated vehicle transmission

1996-02-29

1997-10-14

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

477902, F16H 5972, F16H 5978

Patent

active

056766190

ABSTRACT:
A hydraulic control system for a hydraulically operated vehicle transmission. The system is configured to have a first gearshift mode for determining a gear ratio to be shifted to in accordance with a predetermined gearshift schedule based on detected parameters and a second gearshift mode for changing a gear ratio in accordance with at least one of an upshift command and a downshift command given by the driver. The first mode or the second mode is selected. And when the engine coolant temperature is found to be less than a predetermined value, the selection is prohibited or invalidated. This is because when the temperature is low, the viscosity of the ATF may be high and the time taken for completion of the gearshift is long, causing the driver to sense a time lag between the point at which the command was output and the point at which the actual gearshift is conducted. In the first mode, the driver does not sense this kind of time lag because the gearshift command is output by an electronic control unit without the driver knowing when it was output.

REFERENCES:
patent: 5489247 (1996-02-01), Markyvech et al.

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