Patent · US Expired

Electronic control circuit

US6394414B1 · kind B1 · utility

21Cited by

12References

18Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Wolfram Breitling · Sachsenheim, DE
Horst Singer · Tamm, DE
Reinhold Weible · Stuttgart, DE
Rolf Falliano · Welzheim, DE
Florian Richter · Hemmingen, DE

Key dates

Filing date	Feb 28, 2000
Grant date	May 28, 2002
Priority date	—
Expiry date	Feb 28, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01F7/1805
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electronic control circuit for controlling an electromagnetic valve having an armature, in particular for a heating and/or air-conditioning system in a motor vehicle, has an electronic switching element in series with the coil of the valve and is characterized in that the switching element controls the valve voltage (or the valve current) applied to the coil so that the valve voltage reaches a first value when the valve is switched on; then the valve voltage is reduced to a second value which is lower than the first value; and thereafter the valve voltage assumes a third value which is greater than the second value and represents a holding voltage for holding the armature in its switched-on position.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.