Aisin-warner Limited

Aisin-warner K.k.

Hidehiro Kondo

Shoji Yokoyama

Nobuaki Miki

Takiji Fuji

Toshio Takaichi

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, and a vehicle speed sensor; characterized in that: the electronic control circuit is arranged to nullify setting of the highest gear cancel mode by the manual mode switch at a vehicle speed higher than a predetermined value.

Vehicular automatic transmission control system with gear shift inhibitor

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.

Vehicular automatic transmission control system

A throttle opening detector for internal combustion engine is composed of a slide contact device which has first and second contacts with potential periodically varying in pulse form corresponding to throttle opening variation, phase difference of pulses beteeen said first and second contacts being a fourth of the period, and of a throttle opening reading device which reads out throttle opening from the potential variation in the first and second contacts and variations of exclusive-OR of potential signals in both contacts. The throttle opening detector enables to detect throttle opening precisely using a cheap micro-computer in 2 bits and to carry out the initial adjustment automatically.

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Anjo, Japan

Hidehiro Kondo