Patent ID: 6123057
Filing Date: 2000-09-26
Classification: F02P

Abstract:
Arrangement for communication in an ignition system between at least one ignition module mounted on a combustion engine and a control unit physically separated from the ignition module and arranged at a distance from the ignition module, wherein the ignition module includes at least one ignition coil with a primary winding and a secondary winding, at least one detection circuit for detecting an ionization current in a spark plug gap connected to the secondary winding, and a signal processing unit connectable to the detection unit, the signal processing unit containing means to determine at least one combustion parameter from the detected ionization current, the ignition module including a primary switch connected to the ignition coil's primary winding by means of which primary switch the control unit controls the current through the primary winding and thereby induces an ignition voltage in the spark plug gap, the arrangement being characterized in that the control unit communicates with the ignition module via a cable containing at least,one individual trigger wire for each primary switch in the ignition module, andone first bi-directional communication wire for each ignition module where the first bi-directional communication wire is used to activate the signal processing unit from the control unit, and to transfer information concerning a first combustion related parameter from the ignition module to the control unit, which information is obtained via the detection circuit and the signal processing unit from the combustion process, and where activation and the transfer of information via the communication wire is sequential.