EP 0389775 A3 19910515 - WATCH CIRCUIT OF THE HIGH VOLTAGE IN AN IGNITION DEVICE
Title (en)
WATCH CIRCUIT OF THE HIGH VOLTAGE IN AN IGNITION DEVICE
Publication
Application
Priority
DE 3909906 A 19890325
Abstract (en)
[origin: EP0389775A2] The invention relates to a circuit for monitoring a high-voltage ignition system of an internal combustion engine of a motor vehicle or the like for shunts and/or short circuits, having a series circuit formed from the primary winding of an ignition coil and from an interruptor and connected to a supply voltage or battery voltage. It proposes, in particular for a catalytic converter protection function, that a measurement arrangement (11) which detects the primary current (i) of the ignition coil (2) and converts this current into a corresponding test voltage (UPr) be used, which measurement arrangement (11) has an evaluation circuit (10) which compares the test voltage (UPr) with the voltage supply (Uv) and issues a fault report when the test voltage (UPr) is too large in comparison with the supply voltage (Uv). <IMAGE>
IPC 1-7
IPC 8 full level
F02P 11/06 (2006.01); F02P 17/00 (2006.01); F02P 17/12 (2006.01)
CPC (source: EP US)
F02P 17/12 (2013.01 - EP US)
Citation (search report)
- US 4454560 A 19840612 - NAKAO SATOSHI [JP], et al
- US 3942102 A 19760302 - KUHN KLAUS ROLAND, et al
- EP 0344349 A1 19891206 - BOSCH GMBH ROBERT [DE]
- WO 8911591 A1 19891130 - MOTOROLA INC [US]
- DE 3729824 A1 19890316 - WAGNER PETER DIPL ING [DE]
- [A] PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 139 (M-387)[1862], 14. Juni 1985; & JP-A-60 19 962 (NIPPON DENSO K.K.) 01-02-1985
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0389775 A2 19901003; EP 0389775 A3 19910515; EP 0389775 B1 19950531; DE 3909906 A1 19900927; DE 59009172 D1 19950706; ES 2073464 T3 19950816; US 5027073 A 19910625
DOCDB simple family (application)
EP 90102944 A 19900215; DE 3909906 A 19890325; DE 59009172 T 19900215; ES 90102944 T 19900215; US 48678690 A 19900301