Pressure time controlled unit injector
US4427152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1981 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Jul 13, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/32
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector is provided for each cylinder of an internal combustion engine, the injector including an electronically operated control valve disposed between supply passage and a timing chamber to control the admission of fuel into and out of the timing chamber. A primary pumping piston and a secondary floating piston are axially spaced within the central bore of the injection body, and a normally closed injection nozzle is situated at one end of the injector body. A mechanical linkage associated with the camshaft of the engine drives the primary pumping piston against the bias of a main spring. The timing chamber is defined between the pistons and a metering chamber is defined between the secondary piston and the nozzle. An electronic control unit responds to engine operating conditions, and delivers a signal to the control valve to close the valve and seal the timing chamber for a controlled period of time to form a hydraulic link so that the pistons move in concert during the injection and metering phases of the cycle of operation. When the signal from the ECU is terminated, the control valve opens, and breaks the link so that the primary piston moves independently of the sec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.