EP 3017568 A1 20160511 - APPARATUS AND MEASUREMENT METHOD FOR ASCERTAINING THE INTERNAL DELAY TIME OF A CAN BUS ACCESS UNIT
Title (en)
APPARATUS AND MEASUREMENT METHOD FOR ASCERTAINING THE INTERNAL DELAY TIME OF A CAN BUS ACCESS UNIT
Title (de)
VORRICHTUNG UND MESSVERFAHREN ZUR ERMITTLUNG DER INTERNEN VERZÖGERUNGSZEIT EINER CAN-BUSANSCHLUSSEINHEIT
Title (fr)
DISPOSITIF ET PROCÉDÉ DE MESURE POUR DÉTERMINER LE TEMPS DE RETARD INTERNE D'UNE UNITÉ D'INTERFACE DE BUS CAN
Publication
Application
Priority
- DE 102013213128 A 20130704
- DE 102013218075 A 20130910
- EP 2014062155 W 20140611
Abstract (en)
[origin: WO2015000668A1] An apparatus (5) and a measurement method for ascertaining the internal delay time of a CAN bus access unit (11, 21, 31) are provided in order to check correct operation of serial data transmission in a bus system (4) having at least two subscriber stations (11, 21, 31), wherein the subscriber stations (10, 20, 30) are connected to the bus (40) by means of a bus access unit (11, 21, 31) and exchange messages (41) via the bus (40), wherein transmission access to the bus (40) for each message (41) is allocated to a subscriber station (10, 20, 30) by the arbitration method according to CAN standard ISO 11898–1, which subscriber station becomes the transmitter for this message (41). The apparatus (5) has a unit for ascertaining the internal delay time (DELTA_T) with a delay counter (305) for ascertaining the delay time (DELTA_T) between a transmitted signal (CAN_TX) and a received signal (CAN_RX), which delay counter (305) is stopped if both the received signal (CAN_RX) has a dominant level and the counter reading of the delay counter (305) is greater than or equal to a prescribed configuration value (T_MIN), or for ascertaining the internal delay time (DELTA_T) on the basis of the maximum and minimum delay times of the bus access unit (11, 21, 31). Stopping the delay counter only after a minimum counter reading increases the measurement accuracy in the event of signal perturbations, e.g. as a result of signal reflections.
IPC 8 full level
H04L 12/413 (2006.01); H04L 12/26 (2006.01)
CPC (source: EP US)
H04L 7/0041 (2013.01 - US); H04L 12/4135 (2013.01 - EP US); H04L 43/0852 (2013.01 - EP US); H04L 2012/40215 (2013.01 - US)
Citation (search report)
See references of WO 2015000668A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DE 102013218075 A1 20150108; CN 105340223 A 20160217; CN 105340223 B 20190820; EP 3017568 A1 20160511; JP 2016527778 A 20160908; JP 6204587 B2 20170927; US 2016173295 A1 20160616; US 9917705 B2 20180313; WO 2015000668 A1 20150108
DOCDB simple family (application)
DE 102013218075 A 20130910; CN 201480037580 A 20140611; EP 14730143 A 20140611; EP 2014062155 W 20140611; JP 2016522378 A 20140611; US 201414902623 A 20140611