Toyota Jidosha Kabushiki Kaisha

Fumiaki Izumi

Yukio Hamano

Kunihiro Iwatsuki

Yoshio Shindo

Yuji Kashihara

Yutaka Taga

Hideo Tomomatsu

Hiroji Taniguchi

Kazuhiko Hayashi

Shinji Sekido

Hiroshi Sasaoka

Keita Sakurai

In a system for integrally controlling an automatic transmission and an engine comprising: a member for controlling the engine; a member formed separately of the engine control member, for controlling the automatic transmission; and various communication lines for connecting the engine control member and the automatic transmission control member to each other; judgments are made quickly and without fail as to whether trouble exists, such as disconnections or short-circuits of the various communication lines. When a trouble is detected, the proper control is maintained as much as possible in accordance with the types of trouble.

Double-detecting, trouble-judging and failsafe devices in system for

In a system for integrally controlling an automatic transmission and an engine, an apparatus for controlling the automatic transmission and an apparatus for controlling the engine are formed separately from each other to reduce size and cost, and to facilitate the mounting of control means onto a vehicle. Further, if trouble occurs in this communication system between the engine control apparatus and the automatic transmission control apparatus countermeasures are properly performed, and a trouble is reduced as much as possible.

System for integrally controlling automatic transmission and engine

In a system for shift control in an automatic transmission, wherein a hydraulic control device is operated to selectively switch the engagements of frictionally engaging devices and any one of plurality of gear stages can be achieved in accordance with a preset shift map, a system is provided to judge whether shifting is abnormal or not. When it is judged that the shifting is abnormal, oil pressure for engaging the frictionally engaging devices is raised. With this arrangement, the durability of the frictionally engaging devices can be secured.

System for shift control in automatic transmission

In a system for shift control in an automatic transmission, wherein gear stages are automatically switched in accordance with a preset shift pattern, judgment is made as to whether or not a shifting was abnormal, and, if it is judged as abnormal, the shift pattern in the subsequent shifting is changed to a fail shift pattern, in which shift points are set slightly low. With this arrangement, the durability of frictionally engaging devices is secured.

A diagnostic system for watching the sound operation of a kickdown switch in an automotive vehicle equipped with an automatic transmission adapted to be prohibited from operating at the highest speed stage according to the operation of the kickdown switch, the system including a comparator which compares an output signal from a throttle opening sensor corresponding to the depression of the accelerator pedal of the vehicle and an output signal from the kickdown switch, and generates a warning signal when the two output signals are not correlated with one another in a predetermined mutual relation so as to inform the driver of a malfunction of the kickdown switch.

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Toyota, Japan

Fumiaki Izumi