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:
Dec. 13, 1994
Filed:
Dec. 23, 1991
Friedrich Schmid, Korb, DE;
Andreas Koppitz, Stuttgart, DE;
Friedrich Hase, Stuttgart, DE;
Peter Joppig, Korb, DE;
Roland Klak, Ostfildern, DE;
Mercedes-Benz AG, Stuttgart, DE;
Abstract
The invention relates to a process and apparatus for heating the intake air in internal-combustion engines by means of a flame starting system with at least one glow plug. The apparatus is controlled in such a manner that the glow plug is continuously preheated during a first time period and is operated in pulses in a following second time period and the glow plug is switched off after a safety time has elapsed. The glow plug is preheated after it has been switched off, taking into account the instantaneous glow plug temperature during the cooling and the voltage available in such a manner that the temperature required for a repeat start is reached within a narrow tolerance band. In the case of a repeat starting operation taking place after the safety time has elapsed, the renewed preheating time for the glow plug is specified in accordance with a value determined from the glow plug temperature and the available voltage, the instantaneous glow plug temperature being determined from the cooling time of the glow plug after it has been switched off.