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:
Feb. 20, 1979
Filed:
Nov. 18, 1976
Applicant:
Inventor:
Vittorio Di Nunzio, Turin, IT;
Assignee:
Fiat Societa per Azioni, Turin, IT;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02B / ; G05F / ; F02M / ;
U.S. Cl.
CPC ...
123 / ; 123 / ; 1231 / ; 323 19 ;
Abstract
The period of opening of a solenoid-operated fuel injector is stabilized against variation of vehicle battery voltage by computing the period of injector opening from the instant of a discontinuity present in each rise of the solenoid energizing current. The discontinuity is detected and differentiated to form one input to a comparator, the other input of which is supplemented from the vehicle battery through a Zener diode so that the comparison threshold of the comparator increases as the battery voltage increases. The comparator is automatically switched off in the absence of a solenoid energizing current.