Internal-combustion engines – Charge forming device – With fuel pump
Patent
1992-04-20
1994-05-24
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
123198DB, F02M 3704
Patent
active
053139232
ABSTRACT:
A pump control apparatus is disclosed which is of a small size, quietly operates and has a small number of signal output lines without loosing the fuel pump stopping function upon engine stall. This control apparatus of the invention includes a computer 5 which provides a signal output line 9 with an off-signal that is equal to the potential of a body 7 of a vehicle upon engine stop, and which provides the signal output line 9 with a drive signal that is higher in potential than the off-signal upon engine operation. This control apparatus further includes an FET 12 which is connected in series with a power supply line 8 and a fuel pump 4 and which, when receiving the drive signal, changes the terminal voltage of the fuel pump 4 in accordance with the input drive signal, and when receiving a voltage corresponding to the off-signal, stops the fuel pump 4. Thus, according to this invention, even if the power supply line 8 and the signal output line 9 are brought to the ground potential, or grounded, the fuel pump 4 is sure to be stopped, and thus the safety can be achieved.
REFERENCES:
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patent: 5092302 (1992-03-01), Mohan
Michiyama Katsunori
Sugiura Junji
Takeuchi Shigeru
Miller Carl S.
Nippondenso Co. Ltd.
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