Mazda Motor Corporation

Nippondenso Co., Ltd.

Taku Muguruma

Masato Iwaki

Naofumi Fukue

Kouichi Furuta

Seiji Ohuchi

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.

Control apparatus for a vehicle engine electric fuel pump

A shift indicator system for a vehicle comprises an engine speed sensor for detecting the engine speed, a comparator which receives the output of the engine speed sensor and compares the detected engine speed with a preset speed, an indicator which receives the output of the comparator and provides an indication for directing upshifting, an adverse condition sensor for detecting an adverse condition which can adversely affect the engine output power, and a correcting circuit which receives the output of the adverse condition sensor and increases the preset speed when the adverse condition is detected.

Growing community of inventors

Hiroshima, Japan

Taku Muguruma