Global Patent Index - EP 0996874 A2

EP 0996874 A2 2000-05-03 - METHOD AND DEVICE FOR TESTING A DOUBLE SENSOR SYSTEM

Title (en)

METHOD AND DEVICE FOR TESTING A DOUBLE SENSOR SYSTEM

Title (de)

VERFAHREN UND ANORDNUNG ZUM PRÜFEN EINES DOPPELSENSORSYSTEMS

Title (fr)

PROCEDE ET SYSTEME POUR CONTROLER UN SYSTEME A DEUX DETECTEURS

Publication

EP 0996874 A2 (DE)

Application

EP 98945009 A

Priority

  • DE 9802007 W
  • DE 19730259 A

Abstract (en)

[origin: DE19730259C1] With a double sensor system used for positioning purposes in safety applications, an operating failure, including an inadmissible increase in the sensitivity of one of the sensors (S1, S2), is made known because reference marks (RM1, RM2) each having a response section (AA1, AA2) and a test section (PA11, PA21) are provided for. If operations are proceeding correctly the sensor emits a first output signal (AS1) in the area of the response section and a second output signal (<o>AS1</o>) in the area of the test section. In contrast, when a maximum sensitivity threshold (P) is exceeded the sensor also produces the first output signal (AS1) in the area of the test section. If there is a known change in the signal of the other sensor this is used to test the change in the output signal of the first sensor.

IPC 1-7 (main, further and additional classification)

G05B 9/00

IPC 8 full level (invention and additional information)

B61L 25/02 (2006.01); G01D 3/08 (2006.01)

CPC (invention and additional information)

G01D 3/08 (2013.01); B61L 25/025 (2013.01); B61L 25/026 (2013.01)

Citation (search report)

See references of WO 9903023A3

Designated contracting state (EPC)

AT CH DE DK FR GR IT LI SE

EPO simple patent family

DE 19730259 C1 19990204; CN 1262747 A 20000809; EP 0996874 A2 20000503; WO 9903023 A2 19990121; WO 9903023 A3 19990401

INPADOC legal status


2001-07-25 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010201

2001-04-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010221

2000-05-03 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991217

2000-05-03 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT CH DE DK FR GR IT LI SE