Control device and method for adjusting the angular velocity ratio between a camshaft and a crankshaft

US7036474B2 · kind B2 · utility

Assignee

• Aft Atlas Fahrzeugtechnik GmbH · DE

Inventors

• Detlef Axmacher · Iserlohn, DE
• Massimiliano Gasparro · Halver, DE
• Dirk Neubauer · Altena, DE
• Frank Pachan · Dortmund, DE
• Lars Pfutzenreuter · Werdohl, DE
• Markus Wilke · Leverkusen, DE

Key dates

• Filing date: Mar 14, 2005
• Grant date: May 2, 2006
• Expiry date: Mar 14, 2025

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2820/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A control device and method for adjusting the angular velocity ratio (ωN(t)/ωK(t)) between a camshaft and a crankshaft is provided. Various control devices and methods for rotating the camshaft relative to the crankshaft provide a drive which may advance and retard the camshaft in comparison to the crankshaft. Previous systems have the disadvantage that either two drives in different directions are necessary for each actuation direction or the drive must have right-handed rotation and left-handed rotation. In the control device and the method according to the invention, the advancing of the camshaft is achieved by a drive in the running direction of the camshaft and the retarding is achieved by a braking device. It has been shown to be especially advantageous if an electric motor in two quadrant mode is used as the drive, which may then also be used as the braking device. Such a control device and method are required for setting the control times in internal combustion engines.