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. 23, 1993
Filed:
Dec. 10, 1991
Hans-Jurgen Zurner, Ammerndorf, DE;
Dietmar Henkel, Neumarkt, DE;
MAN Nutzfahrzeuge Aktiengesellschaft, Munich, DE;
Abstract
The present invention relates to an injection system for air-compressing combustion engines. In order to reduce the combustion noise of diesel combustion engines it has been suggested to divide the injection step into a pre-injection and main injection. In order to improve the velocity of the injection quantity increase during partial load and/or at low revolutions per minute it is suggested that a pressure wave generator is arranged downstream of the injection pump and to further provide a volume reservoir in parallel to the pressure wave generator. The pressure wave generator ensures that the passage of the injection line is opened only when a predetermined pressure has been reached. After opening of the pressure wave generator the pressure will not drop as quickly since fuel will be supplied by the volume reservoir even when the injection pump has only a low piston velocity. A further advantage of the present invention is that the by-pass line may branch off at a metering piston unit so that due to the reflection of the pressure wave at the metering piston, generated by the pressure wave generator, a doubling of the pressure occurs.