Importance

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Abstract

An electronic automatic transmission control system for an automobile comprises speed sensor means for detecting the speed of the automobile, load sensor means for detecting engine load, solenoids for controlling the automatic transmission including a lock-up clutch of a torque converter and a computer for receiving signals from the sensor means and for controlling the solenoids, the computer having a memory RAM and ROM for storing shift pattern data representing a plurality of lock-up patterns comprising three sorts of modes, i.e., power mode, economy mode and normal mode, in addition to a plurality of shift patterns comprising three sorts of modes, i.e., power mode, economy mode and normal mode. Any shift pattern and lock-up pattern is selected in one of three sorts of modes from a plurality of the shift patterns and lock-up patterns in accordance with correlation of the running speed and the engine load, and a combined pattern of the shift solenoid and the lock-up solenoid is selected according to the selected shift pattern and lock-up pattern, thereby gear shift and lock-up can be controlled. Safety provisions include dual speed sensors (speedometer) and (transmission output shaft) and fault detecting circuitry to maintain safe operation.

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First Claim