Inventors:
James C. Elmslie - Oxford MI
Gary J. Patterson - Utica MI
Assignee:
General Motors Corporation - Detroit MI
International Classification:
F02M 4100
Abstract:
A method for extending the operating range of engine fuel injectors fed by a pressurized fuel system includes operating the fuel system at a controlled lower fuel pressure during engine operation in a lower power range, and operating the fuel system at a controlled higher fuel pressure during engine operation above the lower power range. An engine embodying the method may include a fuel distributor connected with the injectors for supplying the pressurized fuel and a pressure control operative in response to a prescribed engine condition, such as supercharger boost pressure, to maintain injector fuel supply pressure at a lower value during engine operation in a lower portion of the power range and at a higher value during engine operation in a higher portion of the power range. The dual or multiple fuel pressures provide greater fuel output for increased power in the higher power range with consistent fuel delivery for stable idle and engine operation in the lower power range.