초록 ▼

In a fuel pump driving apparatus for a vehicle engine including a fuel injection system, the selection of a plurality of energizing circuits each formed by the combination of two or all of three brushes of a fuel pump drive motor is effected in accordance with the load conditions of the engine, ther

In a fuel pump driving apparatus for a vehicle engine including a fuel injection system, the selection of a plurality of energizing circuits each formed by the combination of two or all of three brushes of a fuel pump drive motor is effected in accordance with the load conditions of the engine, thereby changing the rotational speed of the motor and hence the fuel quantity delivered from the fuel pump. When the occurrence of a fault in one of the energizing circuits is detected, the driver is informed of the occurrence of the fault and in addition a faulty-condition controller controls switching means in such a manner that the drive motor is energized through another one of the energizing circuits.

대표청구항 ▼

A fuel pump driving apparatus for an engine having a fuel pump, said apparatus comprising: a pump drive motor having an armature, first and second brushes arranged to oppose each other through said armature and a third brush arranged separately from said first and second brushes, wherein said first

A fuel pump driving apparatus for an engine having a fuel pump, said apparatus comprising: a pump drive motor having an armature, first and second brushes arranged to oppose each other through said armature and a third brush arranged separately from said first and second brushes, wherein said first brush is grounded; a power source connected to at least one of said first to third brushes; first and second switch members for connecting said second and third brushes respectively through first and second switch members to said power source; means for detecting a load condition of said engine; first current drawing means for drawing electric current to said armature of said motor through two of said first to third brushes; second current drawing means for drawing electric current to said armature of said motor through all of said first to third brushes; and means for switching enabling and disabling of said first and second current drawing means in response to the detected load condition of said engine, wherein said switching means controls to close said first switch member and to open said second switch member when said load condition detecting means detects a low load condition, and wherein said switching means controls to open said first switch member and to close said second switch member when said load condition detecting means detects a high load condition, and wherein said switching means controls to close both of said first and second switch members when said load condition detecting means detects an intermediate load condition.