Fuel delivery control system
US4838232A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Nov 30, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/366
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for controlling delivery of fuel to a compression ignition engine having a predetermined characteristic ignition delay. A positive-displacement pump, typically a high-pressure, multiplunger in-line pump, receives fuel from a source and provides intermittent, pressurized pulses of fuel flow. A conduit extends from a pumping chamber to a node to which a normally-closed fuel injector is operatively connected. A normally-open, solenoid-controlled bypass valve has an inlet port connected to the conduit node for allowing fuel to bypass the injector. When a signal is applied to the bypass valve it rapidly closes, causing the pressure at the injector to rapidly increase to a first injector-opening level to inject pilot fuel. Thereafter, following a predetermined hydraulic delay, the pressure at the injector rapidly increases to a second level greater than the first to provide main fuel injection. The conduit length determines the hydraulic delay and is selected to have a predetermined time relation with the engine's ignition delay time. The hydraulic delay substantially corresponds with the ignition delay time in the preferred embodiment. The bypass valve also responds rapidly in …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.