Fuel pressure measurement and related processes, systems, and controls
AssigneeCummins-Scania HPCR System, LLC
InventorsMarcus Emanuel Holmgren, David L. Baldwin, Xiaoyu Xie
Life of this patent
Estimating the term…
Abstract
A system and process of operating an internal combustion engine system includes a fuel injector in fluid communication with a fuel rail operable to inject fuel during an engine cycle. A high pressure pump is connected to the fuel rail and includes pumping elements that pressurize the fuel and discrete quantity inlet metering valves that control the fuel flow from the pumping elements. Fuel flow from the pumping elements of the high pressure pump to the fuel rail is terminated by the discrete quantity inlet metering valves during a portion of the engine cycle in order to obtain fuel pressure measurements of the fuel rail while fuel is being injected.
Claims20
A process of operating an internal combustion engine system, the process comprising:
- providing fuel to a plurality of pumping elements through a plurality of discrete quantity inlet metering valves associated with corresponding ones of the plurality of pumping elements;
- pressurizing a fuel rail with fuel output from the plurality of pumping elements, the fuel rail connected to a plurality of fuel injectors that are operable to inject fuel into corresponding ones of a plurality of cylinders of an internal combustion engine during an engine cycle of the corresponding one of the plurality of cylinders;
- controlling each of the plurality of discrete quantity inlet metering valves to terminate a fuel flow from each of the plurality of pumping elements to the fuel rail during the engine cycle;
- measuring a pressure of the fuel rail while the fuel flow from the plurality of pumping elements is terminated during the engine cycle;
- and
- controlling the plurality of discrete quantity inlet metering valves to provide fuel flow from at least one of the plurality of pumping elements to the fuel rail during the engine cycle after measuring the pressure of the fuel rail.
A system including an internal combustion engine, the system comprising:
- a fuel injector in fluid communication with a fuel rail, the fuel injector operable to provide fuel to a cylinder of the internal combustion engine during an engine cycle;
- a high pressure pump in fluid communication with the fuel rail, the high pressure pump including a plurality of pumping elements and a plurality of discrete quantity inlet metering valves associated with respective ones of the plurality of pumping elements;
- and
- an electronic control system configured to:
- control each of the plurality of discrete quantity inlet metering valves to terminate a fuel flow from the plurality of pumping elements to the fuel rail during the engine cycle;
- measure a pressure of the fuel rail while the fuel flow from the plurality of pumping elements is terminated during the engine cycle;
- and
- controlling the plurality of discrete quantity inlet metering valves to provide fuel flow from at least one of the pumping elements to pressurize the fuel rail during the engine cycle after measuring the pressure of the fuel rail.
A method, comprising:
- cutting out at least one fuel pump event associated with at least one injection event during each engine cycle of a plurality of engine cycles;
- and
- measuring a fuel pressure while the fuel pump event is cut-out.
Dependencies are inferred from the claim text.