Patent · US Expired

Method for detecting malfunctions of a first relay

US6304189A · kind A · utility

9Cited by

2References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Stefan Koch · Mainz, DE
Rolf Kremser · Kirchheim unter Teck, DE
Michael Soellner · Bühl, DE

Key dates

Filing date	Jun 15, 2000
Grant date	Oct 16, 2001
Priority date	—
Expiry date	Jun 15, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01H47/002
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for detecting faulty switching operations of a first relay whose switching element is connected in series with a load and which, depending on the switch position, interrupts or closes the connection to the load in accordance with switching commands. In this context, a current is detected flowing through a circuit containing the switching element, and a faulty function of the relay, in particular a sticking of the switching element, is detected if the current intensity does not correspond to the current intensity to be expected in accordance with the selected switching position. Further relays, which can be provided in order to commutate the potentials at the load, can be included in the test. The method makes possible a relay test without moving the actuators, assuming the relays are in order. In addition, this generates a time savings, since not all of the relays have to be triggered for the test.

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