Fuel injection valve drive control apparatus
US5574617A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1994 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Dec 9, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2058
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection valve drive control apparatus in which an opening current is supplied to an excitation coil to open an electromagnetic fuel injection valve, and thereafter a holding current is supplied to keeping the valve open, comprising a first switch connected in series with the coil, a valve driver for controlling conduction of the first switch, and a flywheel circuit and a second switch in parallel with the coil. The second switch is turned on a predetermined time following the start of supply of the holding current. A timer, provided to measure the predetermined time, starts clocking in response to the supply of the holding current or the valve opening current, or turning off of the first switch. The activation time of the second switch is shortened, whereby power consumption is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.