| 摘要 |
PURPOSE:To power off a heater for fuel vaporization even when a heater temperature sensor breaks down and to prevent the fusion of the heater for fuel vaporization by providing a timer circuit and resetting a self-holding circuit when the detected temperature of the heater temperature sensor is lower than specific temperature within the specific clocking time of the timer circuit. CONSTITUTION:A lock switch 13a and a nonlock switch 13b are connected to the power source 12 of a fuel control circuit in series, the heater 15 for fuel vaporization is connected to the primary side of a transformer 17, and the contact 16a of a relay 16 for heater control is connected to the heater 15 in series. Further, the contact 14a of a self-holding relay 14b is connected to the switch 13b in parallel. The temperature detecting circuit consisting of a comparator 25, resistance, capacitor, etc., for the heater 15 is connected to a rectifying and constant voltage circuit 18, and the timer circuit consisting of a comparator 42, resistance, capacitor, etc., is provided. When the detected temperature of the temperature detecting circuit is constant within the specific clocking time of the timer circuit, a current to the relay 14b is cut off and the contact 16a is released to protect the heater 15. |
