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:
Feb. 26, 2002
Filed:
Jan. 19, 1999
Mitsuhiro Shimazu, Hiratsuka, JP;
Shuuki Akushichi, Sagamihara, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A current control apparatus capable of accurately and stably controlling a current which is supplied to an object of control such as a coil of a solenoid even when a control target value varies greatly at a predetermined time interval. In this apparatus, a value (y ) of a current passing through the object of control ( ) is detected, and the detected current value (y ) is output at a predetermined time intervals. On the basis of a preceding corrected current value (y old) and a presently outputted current value (y ), a presently corrected current value (y ) is computed so that this value comes to be intermediate between the preceding corrected current value (y old) and presently outputted current value (y ), and the resultant current value is output. On the basis of a precedingly corrected duty (d old) and a presently outputted duty (d ), a presently corrected duty (d ) is computed so that the presently corrected duty (d ) has a value intermediate between those of the precedingly corrected duty (d old) and the presently outputted duty (d ). On the basis of a target current value (x ) to be input, the outputted corrected current value (y ) and the outputted corrected duty ( d), the duty (d ) is computed, and the result is outputted.