Patent ID: 9518552
Filing Date: 2016-12-13
CPC Classification: B27B,F02B,F02D,F02P

Claim Text:
1. 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.