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A dual speed fuel delivery system for an internal combustion engine in an automotive vehicle includes a fuel pump, a dropping resistor connected to the fuel pump for reducing the voltage required to drive the fuel pump, and a controller for determining an optimum transition point between one of a re

A dual speed fuel delivery system for an internal combustion engine in an automotive vehicle includes a fuel pump, a dropping resistor connected to the fuel pump for reducing the voltage required to drive the fuel pump, and a controller for determining an optimum transition point between one of a relatively high and low speed fuel pump operation so that a controlled amount of fuel is delivered to the engine. The controller calculates fuel pressure increase across the fuel pump, determines the minimum fuel pump voltage necessary to drive the fuel pump such that a predetermined amount of fuel is supplied to the engine and determines the current draw of the fuel pump. The controller then calculates the voltage drop across the dropping resistor and compares the resulting voltage with the minimum fuel pump voltage. The controller then selectively by-passes the dropping resistor based on this comparison.

대표청구항 ▼

[ We claim:] [1.] A dual speed fuel delivery system for an internal combustion engine in an automotive vehicle comprising:an electric motor driven fuel pump coupled to a power supply for delivering fuel to the engine;a dropping resistor connected in series between said fuel pump and said power suppl

[ We claim:] [1.] A dual speed fuel delivery system for an internal combustion engine in an automotive vehicle comprising:an electric motor driven fuel pump coupled to a power supply for delivering fuel to the engine;a dropping resistor connected in series between said fuel pump and said power supply for reducing the voltage required to drive said fuel pump;a controller for determining an optimum transition point between one of a relatively high and low speed fuel pump operation so that a controlled amount of fuel is delivered to the engine, with said controller calculating fuel pressure increase across said fuel pump, determining the minimum fuel pump voltage necessary to drive the fuel pump such that a predetermined amount of fuel is supplied to said engine, with said predetermined amount of fuel corresponding to a calculated amount of fuel that will be consumed by the engine during a given time, determining the current draw of the fuel pump based on said fuel pressure increase and said minimum fuel pump voltage, calculating the voltage drop across said dropping resistor, determining the voltage available at said pump, comparing the voltage available at said pump with said minimum fuel pump voltage, and, selectively by-passing said dropping resistor based on said comparison.