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:
Apr. 04, 2006
Filed:
Apr. 17, 2003
Takao Yamamoto, Saitama, JP;
Ryota Umetani, Saitama, JP;
Yoshihiko Tsuchiya, Saitama, JP;
Kenichi Nishizawa, Saitama, JP;
Takao Yamamoto, Saitama, JP;
Ryota Umetani, Saitama, JP;
Yoshihiko Tsuchiya, Saitama, JP;
Kenichi Nishizawa, Saitama, JP;
Exelixis, Inc., S. San Francisco, CA (US);
Abstract
To provide a fuel pump control device allowing a fuel pump having a small capacity to feed a sufficient amount of fuel to an internal combustion engine. During running of a vehicle at a low speed (for example, less than 2,0 km/hr), pulsed drive voltages are intermittently supplied to a fuel pump in accordance with each opening/closing of a thyristor on the basis of ignition pulses of the engine. In this way, the fuel pump repeats discharge operation at a relatively long cycle in synchronization with the pulsed drive voltages. During running of the vehicle at a high speed, a drive voltage is continuously supplied (that is, a DC voltage is supplied) from a power supply line to the fuel pump, whereby the fuel pump repeats discharge operation at a cycle with a short self-excitation state.