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. 10, 1989
Filed:
Dec. 22, 1987
Applicant:
Inventors:
Kenneth R Butts, Grosse Pointe Woods, MI (US);
Joseph L Wanamaker, Rochester, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
25112905 ; 3644241 ; 7475 / ;
Abstract
A driver circuit for the solenoid actuator coils of a direct pressure electronic transmission control. The circuit is remotely configurable for satisfying the requirements of both shifting and nonshifting modes of operation. In shifting modes of operation, a common snubber element is activated to permit fast commutation of the coil current while protecting the switching devices. In nonshifting modes of operation, dedicated free-wheeling diodes are activated to circulate the coil energy at turn-off of the switching devices to facilitate reduction energy consumption and heating.