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:
Jan. 17, 2017
Filed:
May. 28, 2015
Denso Corporation, Kariya, Aichi-pref., JP;
Naoyuki Yamada, Kariya, JP;
Naoki Mikami, Takahama, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A fuel injection system has a common rail storing fuel, a fuel injector injecting the fuel, a fuel-passage supplying the fuel to the fuel injector, and a fuel-pressure sensor detecting a fuel pressure. An ECU acquires a waveform of a fuel pressure representing a change of a fuel pressure based on the detected fuel pressure at the fuel injection. The ECU calculates a speed of a fuel pressure wave forming the waveform of the fuel pressure based on a period of a pulsation of the waveform of the fuel pressure and a fuel passage length, and a fuel density based on the speed of the fuel pressure wave. The ECU further calculates a fuel cetane number, and a kinematic viscosity of the fuel based on the fuel density and the fuel cetane number. The ECU judges fuel properties based on the kinematic viscosity of the fuel.