Nissan Motor Company Limited

Yazaki Corporation

Kouji Manabe

Hiroo Yabe

Akira Serizawa

Yoshihiro Mitsumoto

Kazuhira Kobayashi

Sadafumi Ikeda

Akira Teranishi

Hironobu Takahashi

A control apparatus for controlling a fuel pump includes: an electronic switch provided in a circuit for connecting a power supply to a motor for driving the fuel pump; a current detector which detects a current which flows through the motor; and a controller which controls the electronic switch in a first PWM mode of a first frequency and a first duty ratio in a normal operation; and change a PWM mode to control the electronic switch in a second PWM mode of a second frequency lower than the first frequency and a second duty ratio lower than the first duty ratio when the current flowing through the motor exceeds a threshold current value in the normal operation.

Fuel pump control apparatus

A power supply system includes: a high voltage power supply; a main power supply wire; a step down circuit inputting a power having a high voltage and outputting a power having a lowered voltage; a sub-power supply wire; a voltage sensor for sensing a voltage of the power outputted from the step down circuit; a sub-switching element disposed on the sub-power supply wire; and a controller for controlling the sub-switching element. The controller turns off the sub-switching element, when the voltage sensed with the voltage sensor is equal to or higher than a first predetermined voltage defined lower than the lowered voltage. Moreover, the controller drives the sub-switching element in duty control for stepping down the power having the high voltage to the power having the lowered voltage outputted from the step down circuit, when the voltage sensed with the voltage sensor is lower than the first predetermined voltage.

Power supply system and process including sub-switching element control

A vehicle engine starting system that drives a starter motor engaged to start an engine by using a lithium secondary battery as a power source comprises a voltage sensor that detects a voltage at the secondary battery and a control device that allows power to be discharged from the secondary battery to the starter motor if the voltage at the secondary battery detected by the voltage sensor is equal to or higher than a predetermined value and disallows a discharge from the secondary battery to the starter motor if the voltage at the secondary battery detected by the voltage sensor is lower than the predetermined value.

Vehicle engine starting system and method

Growing community of inventors

Hadano, Japan

Kouji Manabe