Diesel Kiki Co., Ltd.

Akifumi Tanoue

Hiromi Kono

Yuji Satoh

Yuji Sato

Yoshiyuki Kimura

In a system for automatically controlling a gear transmission wherein an actuator device coupled with an operation member for the gear-shifting operation of the transmission is controlled for shifting the transmission to a target gear position, the system is provided with a first control unit for producing target signals indicating target gear positions and transmission data showing the relationships between specific gear positions of the gear transmission and positions of the operation member. A second control unit responsive to the target signal and the transmission data to produce a control signal for controlling the actuator device so as to position the operation member to a position corresponding to the target gear position.

Automatic control system for gear transmission

A drive control apparatus of an automatic transmission device for use in automotive vehicles including a shift actuator and a select actuator comprising a pair of fluid pressure actuators capable of displacing a shift lever in right-angled two directions of a shift direction and a select direction, a piston rod and a detection rod capable of being displaced for an equal amount with respect to each other by a working fluid which is to be supplied and discharged to and from the actuators, a plurality of electromagnetic valves for supplying and discharging a working fluid to and from the actuators according to a control signal, a position switch for withdrawably engaging in a detection groove formed in an outer periphery of the detection rod and, when engaged, detaining the piston rod and detecting a control reference position of the actuators and outputting a detection signal thereof, a stroke sensor for continuously detecting displacement of the piston rod through the detection rod and an outputting a detection signal thereof, and a control unit for calculating the best position for each said actuators according to an input information regarding the driving state of the automotive vehicle and the operating state of an engine thereof and outputting a processed signal thereof to the electromagnetic valve in order to control the electromagnetic valve and also feedback controlling the activation of the electromagnetic valve according to the detection signals received from the position switch and from the stroke sensor, the activation of the actuators being normally controlled according to the input signal from the stroke sensor but, when the stroke sensor is out of order, being controlled according to the input signal coming from the position switch.

Backup control means for shift lever of an automatic transmission systems

An automatic transmission includes a fluid-pressure differential cylinder for select operation of the transmission and a fluid-pressure differential cylinder for shift operation of the transmission, each of the differential cylinders being built up into one block and joined with the mating differential cylinder with intake and discharge holes in one block held in communication with intake and discharge holes, respectively, in the other block. A piston rod of each of the differential cylinders has an annular groove and a cylinder block is provided with a locking member engageable with the groove to provide a reference position for the piston rod.

Automatic transmission

An automatic gear change device includes a first actuator operation control circuit for controlling the operation of a first actuator, a second actuator operation control circuit for controlling the operation of a second actuator, and a main control circuit for controlling the operation of the first and second actuator operation control circuits. The device further includes a communication line interconnecting the first and second actuator operation control circuits to thereby enable data transmission/reception between each operation control circuit and the main control circuit through the other actuator operation control circuit and the communication line.

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Higashimatsuyama, Japan

Akifumi Tanoue