Ignition circuit

An ignition circuit for a combustion engine having a combustion chamber, the ignition circuit comprising:

• a spark plug arranged in said combustion chamber;
• an ignition coil configured to generate a high voltage for triggering an ignition spark at said spark plug;
• a control unit configured to control said ignition coil;
• said control unit and said ignition coil being consolidated in a common component as an ignition module;
• a generator driven by said combustion engine;
• said ignition module being connected to said generator;
• said spark plug being disposed outside of said ignition module;
• said spark plug and said ignition coil, which is disposed in said ignition module, conjointly forming a high-voltage circuit;
• a reference potential source defining a reference potential outside of said ignition module;
• said high-voltage circuit including a line segment connecting said ignition module to said reference potential;
• a sensor configured to detect operating parameters of the combustion engine and to transmit an output signal to said ignition module;
• said sensor being electrically connected to said ignition module;
• an electric sensor circuit providing a supply voltage to said sensor;
• said electric sensor circuit being connected between said ignition module and said reference potential;
• said electric sensor circuit being connected via said line segment to said reference potential source;
• said high-voltage circuit being connected via said line segment to said reference potential so as to permit both said electric sensor circuit and said high-voltage circuit to be connected via said line segment to said reference potential;
• said line segment being a cable;
• said combustion engine defining a vibration exciting first unit;
• a second unit for accommodating said ignition module therein;
• said first and second units being vibration decoupled from each other and conjointly defining a vibration gap therebetween;
• and,
• said cable being arranged so as to bridge said vibration gap between said first and second units;
• said electric sensor circuit and said high-voltage circuit being interrupted when said line segment is mechanically interrupted;
• said output signal of said sensor transmitted to said ignition module being defective when said electric sensor circuit is interrupted;
• and,
• said control unit of said ignition module being configured to detect that said output signal is defective and to control said high-voltage circuit to prevent undefined high voltage conditions when said defective output signal is detected.