A system for interrupting ignition is disclosed. Specific implementations of ignition interrupters may include a first conductive tab configured to couple to a spark plug; a second conductive tab configured to couple to a spark plug wire; a first tab holder coupled with the first conductive tab; a second tab holder coupled with the second conductive tab, where the second conductive tab overlaps with the first conductive tab; a sled positioned perpendicularly to a plane of the first conductive tab and the second conductive tab, the sled coupled between the first conductive tab and the second conductive tab; a first spring coupled to the sled; and a second spring coupled to the sled; where the sled may be configured to move to an open position in the gap between the first conductive tab and the second conductive tab, decompressing the first spring and the second spring.

An object is to reduce the required numbers of connector pins and A/D converters, without degrading the detection accuracy. There is provided an ignition apparatus which includes: ignition plugs provided for multiple cylinders; an ignition coil provided for each cylinder, and having a primary coil and a secondary coil magnetically coupled to the primary coil and connected to the ignition plug; switching devices each for switching between application and shut-off of current to the primary coil; a primary-voltage-signal separator provided for each cylinder, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal; a primary-signal combiner for electrically combining together each primary signal corresponding to each cylinder, to thereby output a composite primary signal; and a primary-voltage-information detector for inputting thereto the composite primary signal, to thereby output primary voltage information of each cylinder.

An object is to reduce the required numbers of connector pins and A/D converters, without degrading the detection accuracy. There is provided an ignition apparatus which includes: ignition plugs provided for multiple cylinders; an ignition coil provided for each cylinder, and having a primary coil and a secondary coil magnetically coupled to the primary coil and connected to the ignition plug; switching devices each for switching between application and shut-off of current to the primary coil; a primary-voltage-signal separator provided for each cylinder, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal; a primary-signal combiner for electrically combining together each primary signal corresponding to each cylinder, to thereby output a composite primary signal; and a primary-voltage-information detector for inputting thereto the composite primary signal, to thereby output primary voltage information of each cylinder.

An ignition exciter high frequency switching converter, ignition assembly, and method of operating the same, include a high frequency switching converter operably by way of a control circuit having a timing mechanism, to operate the high frequency switching converter in discontinuous conduction mode to charge a tank capacitor for igniting an igniter.

An ignition exciter high frequency switching converter, ignition assembly, and method of operating the same, include a high frequency switching converter operably by way of a control circuit having a timing mechanism, to operate the high frequency switching converter in discontinuous conduction mode to charge a tank capacitor for igniting an igniter.

Implementations of a system for interrupting ignition may include a first spark plug terminal coupled with a first internal contact, the first internal contact extending into a housing; a second spark plug terminal coupled with a second internal contact, the second internal contact extending into the housing; a contactor biased against the first internal contact and the second internal contact; a plunger coupled with a solenoid coupled within the housing; a battery coupled with the solenoid; and a temperature sensor coupled with the battery and the solenoid.

Implementations of a system for interrupting ignition may include a first spark plug terminal coupled with a first internal contact, the first internal contact extending into a housing; a second spark plug terminal coupled with a second internal contact, the second internal contact extending into the housing; a contactor biased against the first internal contact and the second internal contact; a plunger coupled with a solenoid coupled within the housing; a battery coupled with the solenoid; and a temperature sensor coupled with the battery and the solenoid.

An engine operation detection system includes an engine including a spark plug and a spark plug wire, and an engine run sensor including a signal wire including an antenna, the antenna configured to receive a spark plug signal from the spark plug wire, a data acquisition output wire outputting an engine on/off condition signal, a power supply providing power to the engine run sensing circuit, and an engine run sensing circuit configured to transform the spark plug signal into the engine on/off condition signal output via the data acquisition output wire.

An engine operation detection system includes an engine including a spark plug and a spark plug wire, and an engine run sensor including a signal wire including an antenna, the antenna configured to receive a spark plug signal from the spark plug wire, a data acquisition output wire outputting an engine on/off condition signal, a power supply providing power to the engine run sensing circuit, and an engine run sensing circuit configured to transform the spark plug signal into the engine on/off condition signal output via the data acquisition output wire.

Various embodiments of the present technology comprise a method and apparatus for a current circuit. According to various embodiments, the current circuit may be utilized for current detection or current limiting. The current circuit may be configured to compensate for a base current, making detection of an input current more accurate.