Patents Examined by Cart Stuart Miller
  • Patent number: 4791905
    Abstract: In a dc electric fuel pump control apparatus for controlling the quantity of fuel supplied to a vehicle engine in accordance with an engine operating parameter condition such as an intake air flow condition or engine speed condition, when controlling a voltage applied to a fuel pump operating motor by closing or opening a fixed-resistor short-circuiting switch circuit in accordance with the magnitude of the operating parameter relative to a predetermined value, an increase or decrease of a battery power source voltage from a predetermined value is detected to increase or decrease the predetermined value of the engine operating parameter. Where a variable resistor is used in place of the fixed resistor, its resistance value in a low battery power source voltage condition is controlled lower than that in a high battery power source voltage condition.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: December 20, 1988
    Assignees: Nippondenso Co., Ltd., Mazda Motor Corporation
    Inventors: Kouichi Furuta, Naofumi Fukue, Taku Muguruma, Masato Iwaki