| 摘要 |
In a torque converter automatic transmission comprising a torque converter, a speed change gear having friction engaging means, and a hydraulic actuation circuit to supply pressure oil to the friction engaging means, an actuating oil pressure control system comprising a vehicle speed detecting circuit for generating an electrical signal corresponding to the vehicle speed, a load detecting circuit for generating an electrical signal corresponding to the vehicle loading, an operational circuit adapted to receive as the inputs thereto and operate on the output signals from said two detecting circuits in accordance with an equation so as to generate an output voltage, a sawtooth voltage having a constant period, a comparator circuit for comparing the output sawtooth voltage of the sawtooth wave generating circuit with the output voltage of the operational circuit to generate a rectangular voltage having a time width corresponding to said equation, and means for varying the actuating oil pressure of the oil under pressure supplied to the friction engaging means according to the output rectangular voltage of the comparator circuit, whereby said actuating oil pressure is controlled in accordance with variations in the time width of the output rectangular voltage of the comparator circuit.
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