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:
Jul. 22, 2003
Filed:
Mar. 19, 2002
Tillmann Braun, Berglen, DE;
Uwe Gärtner, Remshalden, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
A process and system are provided for automatically controlling the fraction of the exhaust gas quantity returned to an internal-combustion engine with respect to the mixture quantity fed on the whole to the internal-combustion engine, which mixture quantity is formed by the returned exhaust gas quantity and a fresh air quantity. The actual fraction of the returned exhaust gas quantity with respect to the mixture quantity fed on the whole to the internal-combustion engine is determined by sensors from measurements of the temperature of the fed fresh air quantity, the temperature of the returned exhaust gas quantity and the temperature of the mixture quantity fed as a whole. This actual fraction of the returned exhaust gas quantity is adapted to a predetermined desired fraction. In the case of a further process, the actual fraction of the returned exhaust gas quantity with respect to the mixture quantity fed on the whole to the internal-combustion engine is determined by at least one sensor from at least one measurement of the temperature of the exhaust gas flowing out of the internal-combustion engine, and this actual fraction of the returned exhaust gas quantity is adapted to a predetermined desired fraction. In the case of a further process, the actual fraction of the returned exhaust gas quantity with respect to the mixture quantity fed on the whole to the internal-combustion engine is determined by means of measurements of the flow rate of the fresh air quantity fed to the internal-combustion engine and the flow rate of the mixture quantity fed on the whole to the internal-combustion engine, and this actual fraction of the returned exhaust gas quantity is adapted to a predetermined desired fraction. In the case of a further process, the returned exhaust gas quantity is automatically controlled to a predetermined content of nitrogen oxides in the exhaust gas.