Apparatus for driving electromagnetic devices, particularly electromagnetic injection valves in internal combustion engines

US4350132A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Harsch · Ditzingen, DE
• Peter Schulzke · Oberriexingen, DE

Key dates

• Filing date: Apr 23, 1981
• Grant date: Sep 21, 1982
• Expiry date: Apr 23, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/503
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An apparatus is proposed for driving electromagnetic devices, in particular electromagnetic injection valves in internal combustion engines. The apparatus includes a signal source for actuating pulses and is characterized in that at least one timing circuit is provided for advanced magnetization, preferably dependent on operating characteristics, of the electromagnetic device. The apparatus achieves the most linear possible relationship between the duration of the actuating pulse and, for example, the opening time of the injection valve. In this manner, the fuel quantity to be supplied to the internal combustion engine can be more precisely dosed and the operational behavior of the engine can be made optimal. Because of the advanced magnetization, the electromagnetic injection valve, for example, attracts more rapidly at the onset of the actuating pulse, because the magnetic coil has already stored a certain amount of energy, which lies somewhat below that amount which is required for attraction on the part of the magnetic core and thus for the ejection of fuel.