Pressure-responsive fuel delivery system.

摘要

A fuel delivery system for an internal combustion engine that includes a fuel supply with a fuel pump (14) responsive to application of electrical power for supplying fuel under pressure to fuel injectors (24, 26, 28, 30) mounted on the engine. A pressure sensor (102) is coupled to the pump/injector fuel delivery line (18) for measuring fuel delivery pressure. A second sensor (108) is positioned within the fuel tank (16) and is responsive to fuel alcohol concentration. The pump motor (12) is energized by a pulsed d.c. signal having a duty cycle that varies as a combined function of the pressure and alcohol-concentration sensor output signals so as to maintain constant fuel pressure at the injectors while automatically compensating quantity of fuel delivered by the injectors for differing fuel alcohol concentrations.