Control device for high-pressure fuel system

摘要

The present invention relates to reducing exhaust emissions at startup, providing improved fuel pressure control performance in a low-load region, and detecting high-pressure fuel system abnormalities. Disclosed is a high-pressure fuel system control device (203) which includes a high-pressure pump (207) for pressurizing fuel and discharging the pressurized fuel to a fuel rail (205), an injector (204) for injecting the fuel stored in the fuel rail (205), and a fuel pressure sensor (206) for measuring the pressure of the fuel stored in the fuel rail (205), and controls the high-pressure pump (207) and the injector (204) in accordance with an output generated from the fuel pressure sensor (206). The high-pressure fuel system control device (203) includes a homo-elasticity coefficient estimation section (901) for estimating a homo-elasticity coefficient of fuel in accordance with a pressure change which occurs when a fuel discharge amount of the high-pressure pump (207) is not smaller than a predetermined value; a fuel pressure estimation section (903) for estimating fuel pressure within the fuel rail (205) in accordance with the homo-elasticity coefficient and control target values for the high-pressure pump and the injector (204); and a fuel control section (904) for correcting an injection pulse of the injector (204) in accordance with the fuel pressure estimated by the fuel pressure estimation section (903).