Apparatus for detecting condition of burning in internal combustion engine
November 14, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesVoltage source for ion current measurement in an internal combustion engine Method and apparatus for detecting ion current in an internal combustion engine ignition system Misfire-detecting system for internal combustion engines Misfire-detecting system for internal combustion engines Method and apparatus for detecting cylinder misfire in an internal combustion engine Misfire detector device for use in an internal combustion engine Sensor and method for detecting misfires in internal combustion engines 5548220 Misfire detecting circuit for internal combustion engine Apparatus for detecting misfire in internal combustion engine Patent #: 5563332 InventorsAssigneeApplicationNo. 748785 filed on 11/14/1996US Classes:73/116, MOTOR AND ENGINE TESTING73/35.08, Ionization324/399Wherein a measured electric quantity indicates spark plug conditionExaminersPrimary: Dombroske, George M.Attorney, Agent or FirmForeign Patent References
International ClassesF02P 017/00G01M 015/00 Foreign Application Priority Data1995-11-14 JPAbstractAn apparatus for detecting a condition of burning in an internal combustion engine includes a spark plug and an ignition coil. The ignition coil has a primary winding and a secondary winding. The secondary winding is connected to the spark plug. An ion current sensing resistor is connected to a low voltage side of the secondary winding of the ignition coil for sensing an ion current. A diode is connected in parallel with the primary winding of the ignition coil. A switching element is connected in series with the primary winding of the ignition coil. The switching element is movable into and out of an on state. A suitable device is operative for resisting a current flowing through the diode when the switching element is in the on state.Field of SearchIonizationMOTOR AND ENGINE TESTING Disparate tests under operating conditions With continuous operation Operation efficiency (e.g., engine performance, driver habits) Electronic ignition system With capacitor discharge circuit In situ testing of spark plug Wherein a measured electric quantity indicates spark plug condition Apparatus for coupling a measuring instrument to an ignition system | |
