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:
Oct. 21, 2003
Filed:
Jun. 06, 2001
Günther Uhl, Ludwigsburg, DE;
Beru AG, Ludwigsburg, DE;
Abstract
Process and circuit for heating up a glow plug of a given glow plug type in a given arrangement in an internal combustion engine to a predetermined temperature. The power supply voltage is on the glow plug via a measurement resistor ( ) and a switch ( ). A control and regulation unit ( ) taps the voltage drop via the measurement resistor ( ) and determines the heat energy supplied to the glow plug therefrom and from the likewise tapped voltage on the glow plug. The signal which occurs on the output ( ) of the unit ( ) controls the switch ( ). After closing the switch ( ) the unit ( ) supplies the glow plug with heat energy which is added up in the unit ( ). As soon as the heat energy which is required for heating up to a predetermined temperature and which is determined beforehand from the known parameters of the glow plug and from the starting temperature is reached, the switch is opened again via the output signal at the output ( ).