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:
Nov. 04, 1997
Filed:
Nov. 01, 1996
Si Cheon Lee, Changwon, KR;
Myung Hoon Song, Changwon, KR;
Samsung Heavy Industries Co., Ltd., Seoul, KR;
Abstract
A method for controlling the RPM of an engine in a hydraulic construction machine. A reference throttle lever position value and a reference engine RPM value are set to allow the engine to have a target output characteristic. A first control arithmetic operation is performed in response to a present throttle lever position value and the set reference throttle lever position value to allow a difference between the present throttle lever position value and the set reference throttle lever position value to be within the range of a mechanical error of an engine throttle control mechanism. A first control signal is generated as a result of the first control arithmetic operation to control the RPM of the engine. Then, a second control arithmetic operation is performed in response to a present engine RPM value and the set reference engine RPM value to allow the present engine RPM value to be approximated to the set reference engine RPM value under the condition that a difference therebetween is within the range of the mechanical error of the engine throttle control mechanism. A second control signal is generated as a result of the second control arithmetic operation to control the RPM of the engine.