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. 27, 2001
Filed:
Dec. 02, 1998
Yoshiaki Ueda, Fuji, JP;
Jatco Transtechnology Ltd., Fuji, JP;
Abstract
A solenoid supply current value is predicted from a detected battery voltage, an operational fluid temperature, and the like, and a chopper ON time during chopping drive is reduced, and relatively, a chopper OFF time is increased by using, for example, a voltage correction coefficient which becomes smaller as the battery voltage becomes larger, or a temperature correction coefficient which is set smaller as the operational fluid temperature is smaller. Alternatively, an overexciting current of the solenoid is detected at least at two time points during overexcitation, and a termination time point of the overexcitation at which the overexciting current reaches a target overexciting current is predicted from the overexciting current value, and the overexcitation is terminated when the termination time point is reached.