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. 25, 1997
Filed:
Jan. 11, 1996
Andrew O Fonkalsrud, Yorkville, IL (US);
Steven V Christensen, Peoria, IL (US);
Mitchell J McGowan, Groveland, IL (US);
Thomas L Grill, Marseilles, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An electrohydraulic control device for a drive train of a machine including an engine, a transmission, a torque converter, and an impeller clutch is disclosed. A manually operated impeller clutch pedal produces an impeller clutch pedal signal in response to the position of the impeller clutch pedal. An impeller clutch electrohydraulic valve produces fluid flow to the impeller clutch to controllably engage and disengage the impeller clutch. An impeller clutch pressure curve that is responsive to the impeller clutch pedal position is stored in memory. A rotary position switch selects a desired rimpull setting indicative of a desired reduction in rimpull and produces a desired rimpull signal. An electronic controller receives the desired rimpull signal and reconfigures the impeller clutch pressure curve. Thereafter, the electronic controller receives the impeller clutch pedal signal and controllably actuates the electrohydraulic valve to produce a desired impeller clutch pressure defined by the impeller clutch pressure curve.