Patent ID: 9429132
Filing Date: 2016-08-30
CPC Classification: F02P

Claim Text:
1. A capacitive ignition system ( 1 ) with ion-sensing comprising an ignition coil ( 2 ), with a primary winding ( 3 ) that is connected to an energy source for providing the energy for a spark event and with a secondary winding ( 4 ) having a first terminal (T 1 ) connected to a spark plug ( 5 ) so that a secondary voltage (V S ) across the secondary winding ( 4 ) is applied to the spark gap ( 8 ) of the spark plug ( 5 ), an ionization current biasing and measurement circuitry ( 6 ) on a secondary side of the ignition coil ( 2 ) for providing a biasing voltage to the spark gap ( 8 ) after the spark event for ion-sensing and a diode (D 1 ) that is connected across the secondary winding ( 4 ), wherein the diode (D 1 ) is connected across the secondary winding ( 4 ) so that it is reverse-biased for a spark current flowing through the spark gap ( 8 ) during the spark event of the spark plug ( 5 ) and forward-biased for an AC ringing voltage (V R ) after the spark event.