| 摘要 |
PURPOSE:To aim at improvement of the startability of an automatic transmission at the time of cranking by causing a line pressure control solenoid to be operated by means of a circuit switch different from another circuit switch which is set to ON and OFF by virtue of the computer output so as to reduce the line pressure. CONSTITUTION:Signals from the computer output port are supplied to the base of a circuit switch Tr-1 for the PNP transistor, and then, when the base voltage is OFF, the source voltage is supplied to the coil of a line pressure control solenoid 15. While, between the source voltage and the coil of the line pressure control solenoid 15 is placed a circuit switch Tr-2 for the PNP transistor in parallel to the circuit switch Tr-1, whose base voltage is grounded by means of an NPN transistor switch Tr-3. To the base of the transistor switch Tr-3, a voltage signal, which is applied by means of a diode D to a starter 17, is supplied when a starter switch 18 is set to ON. |
