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:
Jul. 30, 1996
Filed:
Sep. 18, 1995
Komatsu Ltd., Tokyo, JP;
Abstract
A control mechanism for a hydrostatic-mechanical power transmission system having a mechanical transmission unit driven through an input shaft connectable to a power source, and a hydrostatic transmission unit that is connectable to the input shaft and includes a pump and a motor each having a displacement setting swash plate. The control mechanism further includes a differential unit for connecting an output shaft to the mechanical transmission unit and the hydrostatic transmission unit to drive. At least either of the displacement setting swash plates is variable in angle. The control mechanism also includes a throttle position detector for detecting the position of a throttle in relation to the power source; a target motor speed ratio setting device for setting, based on the position of the throttle detected by the throttle position detector, a target motor speed ratio that is a target value for the ratio of the revolution speed of the motor in the hydrostatic transmission unit to the revolution speed of the power source; and a swash plate angle controller for controlling at least either of the angles of the displacement setting swash plates by feed-forward control in which the target motor speed ratio set by the target motor speed ratio setting device is used in such a way that the ratio of a displacement volume of the pump to a displacement volume of the motor is made to follow the target motor speed ratio.