Control apparatus for fuel pump
US5313923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Apr 20, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2037/085
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.