Automatic transmission

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

74868, B60K 4106

Patent

active

050741675

ABSTRACT:
An automatic transmission includes a hydraulic control circuit for developing coupling pressure to the friction coupling member, the hydraulic control circuit having a regulator device for regulating the coupling pressure and a solenoid valve for controlling the regulator device, a hydraulic pressure sensor device for detecting hydraulic pressure in connection with the coupling pressure, an actuator device for actuating the solenoid valve in a range between the opening position and the closing position to change the control amount of the solenoid valve when the vehicle is in a predetermined state, a memory device for storing a characteristic relationship between detected hydraulic pressures and changed control amounts, and a control device for controlling the solenoid valve based on the characteristic relationship so that the regulator device regulates the coupling pressure to a desired value. This automatic transmission compensates a variation in characteristic relationship between the control amount of the solenoid valve and the coupling pressure, and assures more accurate open control.

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patent: 4919012 (1990-04-01), Bolz
patent: 4955256 (1990-09-01), Kashihara et al.
07/342855 Pending Patent Application Assigned to Mazda Motor Corp., Dated 04-25-89.

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