초록 ▼

A fuel cut-off valve in the fuel injection pump of an internal combustion engine is provided with a device for facilitating the opening of the valve against pressure forces normally biasing the valve closed. A pair of solenoids may be provided, with both being used to open the valve and only one to

A fuel cut-off valve in the fuel injection pump of an internal combustion engine is provided with a device for facilitating the opening of the valve against pressure forces normally biasing the valve closed. A pair of solenoids may be provided, with both being used to open the valve and only one to hold the valve open. Alternately, a single solenoid may be supplied with a large quantity of power to open the valve, and considerably small power to hold the valve open. In a second alternative, an auxiliary passageway is formed in the valve, and a pressure relief valve normally blocking the auxiliary passageway can be opened to alleviate the pressure on the first valve.

대표청구항 ▼

A fuel cutoff apparatus for a fuel injection pump in an internal combustion engine, comprising: (a) a valve member movable to selectively open or block a port connecting a source of fuel to a fuel line; (b) an electromagnetic coil means selectively energizable at a plurality of distinct energy level

A fuel cutoff apparatus for a fuel injection pump in an internal combustion engine, comprising: (a) a valve member movable to selectively open or block a port connecting a source of fuel to a fuel line; (b) an electromagnetic coil means selectively energizable at a plurality of distinct energy levels to move said valve member to open or block the port; and (c) a controller means for energizing said electromagnetic coil means to pen said port in response to a valve opening command by determining whether the energy level of said coil means is at an energy level causing said valve member to open or to block said port, said controller means being further operable for determining a characteristic of engine speed of said engine when said energy level of said coil means is determined to be at a level causing said valve member to block said port member, for providing a variable level of electrical current to said coil means as a function of said engine speed characteristic for opening said port, and for selecting the electrical current in accordance with said engine speed characteristic whereby said controller causes said valve member to open said port with efficient current utilization.