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:
Dec. 07, 1999
Filed:
Jun. 23, 1998
Aftab A Khan, Dearborn, MI (US);
Peter J Dix, Naperville, IL (US);
Alan D Berger, Winfield, IL (US);
Richard L Hall, Burlington, IA (US);
Rich Lech, Burlington, IA (US);
Case Corporation, Racine, WI (US);
Abstract
An anti-stall and bias control for a hydrostatic drive train system is disclosed. The system is used on a hydrostatic drive vehicle with an engine coupled to a first and second hydraulic pump. The first and second hydraulic pumps are coupled to first and second drive motors which drive wheels of the vehicle. The power to the drive motors is controlled by a control unit which output signals proportional to the desired power output from the motors. An engine speed sensor determines the speed of the engine. The control circuit reads the engine speed and determines whether the engine is in a stall condition. If the engine is in a stall condition, the control circuit scales the control signals of the first and second motor to reduce power output. A bias control is also provided to allow the vehicle operator to select greater relative power to either the first or second motor. The bias control outputs a bias signal which is read by the control unit. The bias signal is converted into a scaling value which is multiplied by the control signal to the nonselected motor to reduce power of the motor.