Control of an electrically heated pre-heating device for cold-starting internal combustion engines

US7464699B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Peter Joppig · Bad Marienberg, DE
• Frank Lantermann · Bietigheim-Bissingen, DE
• Friedrich Schmid · Bad Marienberg, DE
• Karl Vogel · Bad Vilbel, DE

Key dates

• Filing date: Jul 15, 2004
• Grant date: Dec 16, 2008
• Expiry date: Jul 24, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for heating up the intake air of an internal combustion engine during the preglow phase or start-up phase, the heating power is controlled by a control unit of the engine electronics as a function of the operating data of the internal combustion engine. During the preglow phase, the heating element is initially supplied with full current until the heating element reaches its reference temperature. After the reference temperature has been reached and until the start-up phase, a post-heating phase begins in which the heating element is kept at a constant temperature by way of a relatively low power. During the start-up phase, in a first time period, the heating element is switched off, and in a second time period in which the speed of the internal combustion engine is raised to the starting speed, the heating element is switched on again.