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:
Apr. 26, 2016
Filed:
Dec. 06, 2011
Yoshito Hujishiro, Saitama, JP;
Yutaka Tanaka, Saitama, JP;
Tomohiro Nakamura, Saitama, JP;
Bosch Corporation, Tokyo, JP;
Abstract
To suppress current fluctuations upon commencement of driving and prolong lifespan by reducing electric stress caused by current fluctuations. A glow plug, a glow switch, and a stabilizing coilare series-connected, and upon commencement of the driving of the glow plug, a repetition frequency of PWM signals that control the opening and closing of the glow switchis made into a higher frequency than a repetition frequency in a normal drive state and the opening and closing of the glow switchis controlled (S), and when a predetermined drive shift condition has been met (S), the repetition frequency of the PWM signals is returned to the frequency during normal driving and the opening and closing of the glow switchis controlled (S), whereby the current upon commencement of driving is smoothed and the occurrence of an instantaneous large current is suppressed.