Vehicular automatic transmission control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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May 30, 1989
Grant Date -
N/A
app pub date -
Mar 27, 1984
filing date -
Mar 31, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicular automatic transmission control system comprising: a hydraulic control circuit including a hydraulic pressure source, a pressure regulator valve for producing a line pressure by regulating the oil pressure supplied from the pressure source, a number of shift valves for selectively engaging and releasing friction members of the automatic transmission according to operating conditions of a vehicle such as vehicle speed and throttle opening rate, and a solenoid valve blocking switching operation of a highest shift gear toward a highest gear position of the transmission; and an electronic control circuit for controlling on-and off-ranges of the solenoid valve, including a manual mode switch for setting the control either in a highest speed non-cancel mode permitting shifts to the highest gear position or a highest speed cancel mode inhibiting shifts to the highest gear position and forcibly effecting a downshift when selected during operation in the highest gear position, vehicle speed sensor, and a kickdown switch detecting a throttle opening rate greater than a predetermined value; characterized in that: the electronic control circuit is provided with circuitry for resetting the mode of control in a predetermined initial state upon turning on a power switch of the engine.
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