The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2011
Filed:
Mar. 05, 2009
Akira Serizawa, Makinohara, JP;
Hiroo Yabe, Susono, JP;
Sadafumi Ikeda, Chigasaki, JP;
Kouji Manabe, Hadano, JP;
Akira Teranishi, Atsugi, JP;
Hironobu Takahashi, Ebina, JP;
Akira Serizawa, Makinohara, JP;
Hiroo Yabe, Susono, JP;
Sadafumi Ikeda, Chigasaki, JP;
Kouji Manabe, Hadano, JP;
Akira Teranishi, Atsugi, JP;
Hironobu Takahashi, Ebina, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
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.