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AssigneeAisin Seiki Kabushiki Kaisha
InventorsShoji Kawata, Tomoaki Nishimura, Naoji Sakakibar, Nobuyuki Imai, Hiroyuki Amano, Shigemitsu Hamajima
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A safety circuit in an automatic transmission control system having a comparator producing a transmission shifting control signal wherein upon comparing a vehicular velocity responsive signal and a throttle opening responsive signal, the safety circuit comprises: a comparator whose inverting input terminal is supplied with the vehicular velocity responsive signal through a capacitor and whose non-inverting input terminal is supplied with a constant voltage signal which is lower than the inverting terminal signal at normal state, the comparator detecting the difference between the two input voltages; a transistor circuit for connecting to ground said transmission shifting control signal; and a latching circuit for latching the output signal of the transistor circuit, whereby an abrupt loss of the vehicluar velocity responsive signal is detected.
A safety circuit for use in an automatic transmission control system having a control circuit for receiving a first input signal which is responsive to the velocity of a vehicle and a second input signal which corresponds to the output torque of the vehicle engine or to the throttle opening of the vehicle engine, and for producing a transmission shifting control signal upon comparing the first and second input signals, said safety circuit comprising:
Dependencies are inferred from the claim text.