| 摘要 |
PROBLEM TO BE SOLVED: To surely stop fuel supply even in occurrence of abnormality that an output signal from a microcomputer relating to control of a device for fuel supply, is fixed to a state of constant voltage.SOLUTION: An electromagnetic pump 72 for fuel supply is connected to a common relay 120 and an EP relay 130 in series with respect to an AC power source 105. An excitation circuit 200 switches on the common relay 120 at a time period when a pulse signal as a control signal Pcr is output from a microcomputer 100. An excitation circuit 300 switches on the EP relay 130 when a control signal Sper is set to an active level from the microcomputer 100. The microcomputer 100 produces a control signal Sepr to control an opening/closing timing of the EP relay 130 according to a phase of the AC voltage Vac of the AC power source 105.SELECTED DRAWING: Figure 3 |
