Valve timing detection in fuel system using off cycle sweep
US12116941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2023 |
| Grant date | Oct 15, 2024 |
| Priority date | — |
| Expiry date | Aug 1, 2043 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2055
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Operating a fuel system for an engine includes moving a plunger during a pumping cycle between an advanced position and a retracted position, and pulsing a solenoid actuator in an electrical circuit during at least one off cycle of the plunger where the plunger is neither advancing nor retracting with a plurality of current pulses of varied duration. An electrical property such as a freewheeling response in the electrical circuit induced by moving a valve in response to each respective current pulse is monitored, and a valve timing of the valve determined based on the monitored electrical property. The fuel system including a fuel injector may be electronically trimmed based on the determined valve timing. Related apparatus and control logic is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.