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:
Jun. 09, 1992
Filed:
Sep. 07, 1990
Robert W Deutsch, Sugar Grove, IL (US);
James W Kopec, St. Charles, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Measurement of fluid flow (or other fluid parameter) through a solenoid-actuated valve (12), and/or measurement of nominal operation of the valve itself, is achieved in one embodiment by modifying the amplitude of flyback pulses (48) generated by the solenoid. The degree of modification preferably varies with the value of the sensed information, and the modified flyback pulses are processed to extract that information from diagnostic and/or control purposes. In another embodiment, a variable impedance is established in the path of the solenoid's recirculation current. For a fraction of the solenoid's recirculation period, the impedance is caused to vary as a function of the value of the sensed information. For the remainder of the recirculation period, the value of the impedance is greatly reduced to maintain the recirculating current at a relatively high level.