초록 ▼

A direct injected gas engine system is made more suitable for use with a fuel of natural gas by a fuel control system providing variable gas pressure control to reduce gas pressure compared to that applied at full load, and extend fuel pulse duration for light loads as compared to fuel pulse duratio

A direct injected gas engine system is made more suitable for use with a fuel of natural gas by a fuel control system providing variable gas pressure control to reduce gas pressure compared to that applied at full load, and extend fuel pulse duration for light loads as compared to fuel pulse duration at light loads if applied at the full load gas pressure. The light load fuel pulse duration can now be extended to be at least as long as the ignition delay period of the engine. A variable gas pressure regulator under the control of the engine's electronic control module provides the desired gas pressure control. Engine speed and load parameters are used to monitor engine conditions and provide signals to the electronic control module, which may use them to set the appropriate pressure in a map mode. The apparatus and method of operation improves efficiency and lowers emissions at light loads.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel system of a direct injected gas engine comprising:a source of pressurized gaseous fuel containing natural gas pressurized to at least about 1,000 psi;an injector arranged to inject fuel directly into a combustion chamber of an engine;a fuel control system controlli

[ What is claimed is:] [1.] A fuel system of a direct injected gas engine comprising:a source of pressurized gaseous fuel containing natural gas pressurized to at least about 1,000 psi;an injector arranged to inject fuel directly into a combustion chamber of an engine;a fuel control system controlling pressure of fuel supplied to the injector from the source, said fuel control system being responsive to engine load conditions to reduce the pressure of the fuel at light loads, compared to the pressure of the fuel at full load, and to increase the duration of pulses of the fuel at light loads, compared to the duration of pulses to supply a substantially equivalent quantity of gas at the full load gas pressure, wherein the fuel control system comprises a dome loaded gas pressure regulator and an electronic control module, said electronic control module being arranged to receive input signals relating to engine parameters and to provide output signals, to a control valve controlling a fluid of a hydraulic control loop, that determine the pressure of pulses of fuel supplied to the injector by the regulator.