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:
Mar. 17, 1987
Filed:
Nov. 07, 1983
Nippon Soken, Inc., Nishio, JP;
Abstract
A fuel injection system for an internal combustion engine includes sensors for sensing the reference rotational position of the engine, a unit injector for compressing the fuel and injecting a predetermined amount of the fuel, and an electronic control device. The unit injector includes an actuator such as a piezoelectric actuator, a piston, and an injection valve. The piezoelectric actuator comprises a columnar laminated body of disk-shaped piezoelectric elements. The laminated body is expanded or compressed in the axial direction of the column according to the application of a positive or a negative high voltage. The electronic control device controls the frequency of the voltage supplied to the actuator during the period from the timing of a reference rotational position and controls, accordingly, the amount of fuel injection in accordance with the frequency of the voltage supplied to the actuator.