Diagnostic tool for electric-operated fuel injectors and their drivers
US6761059B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2002 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Sep 1, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M51/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diagnostic tool (10) for testing fuel injectors (50) and their driver circuits (IDM), including associated wiring harnesses, in a fuel injection system of an engine in a motor vehicle. The tool has a driver-connection port (16) for connection to the driver circuits and an injector-connection port (18) for connection to the fuel injectors via jumper wiring harnesses. The tool can perform 1) a fuel injector test, by connecting an ohmmeter to the tool to measure injector coil resistance, 2) a driver-injector test, by connecting an oscilloscope to the tool to observe traces of electric current waveforms applied to the fuel injector, 3) a driver circuit test, by connecting the respective driver circuit to a load that simulates the load imposed by the respective fuel injector, and 4) a cylinder contribution test, by selectively disconnecting certain fuel injector actuators from their driver circuits while leaving the remaining fuel injector actuators connected to their driver circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.