EP 2224124 A1 20100901 - A glow plug controller for vehicles
Title (en)
A glow plug controller for vehicles
Title (de)
Glühkerzensteuereinheit für Fahrzeuge
Title (fr)
Contrôleur de bougie de préchauffage pour véhicules
Publication
Application
Priority
EP 09100156 A 20090227
Abstract (en)
The invention relates to a glow plug controller (10) and a method to operate a plurality of glow plugs (20, 21, 22, 23) such a way that the glow plugs (20, 21, 22, 23) generate lower EMI levels. The glow plug controller (10) receives a set of engine parameters (18) and generates PWM signals (31, 32, 33, and 34) to control each of the glow plugs (20, 21, 22, and 23). When the PWM signals (31, 32, 33, and 34) have more than 50% duty cycle, spikes appear in the current waveform whenever three or more of the PWM signals (31, 32, 33, 34) have on periods. This results in EMI. To reduce the peak level of the energy which represents the EMI, jitter is added to the PWM signals by varying the frequency of the PWM signals. The jitter in the PWM signals will spread the energy in the spikes over a range of frequency components, bringing down the peak level of the energy, thereby reducing the peak EMI level.
IPC 8 full level
F02P 19/02 (2006.01)
CPC (source: EP)
F02P 19/022 (2013.01); F02D 2041/2027 (2013.01); F02P 19/023 (2013.01)
Citation (applicant)
- US 2006009369 A1 20060112 - KILKENNY ANDREW [US], et al
- DE 102006010083 A1 20070606 - BERU AG [DE]
Citation (search report)
- [X] DE 102006010083 A1 20070606 - BERU AG [DE]
- [X] WO 2006009523 A1 20060126 - COSYLAB D O O [SI], et al
- [X] WO 2008110143 A1 20080918 - BERU AG [DE], et al
- [A] US 6164258 A 20001226 - PETROVICH PAUL A [US], et al
- [A] US 3916329 A 19751028 - HEKIMIAN NORRIS C, et al
Citation (examination)
US 2005253636 A1 20051117 - YANG TA-YUNG [US], et al
Designated contracting state (EPC)
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 SE SI SK TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
DOCDB simple family (application)
EP 09100156 A 20090227; CN 201010126191 A 20100226