Spark plug testing under dynamic load
Patent 4825167 Issued on April 25, 1989. Estimated Expiration Date: 
November 2, 2007. 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.
November 2, 2007. 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 ReferencesEngine performance analyzer Ignition arc monitor circuit Testing method for ignition systems of internal combustion engines in motor vehicles Patent #: 4684896 InventorAssigneeApplicationNo. 07/115111 filed on 11/02/1987US Classes:324/399, Wherein a measured electric quantity indicates spark plug condition324/393, In situ testing of spark plug324/402, Apparatus for coupling a measuring instrument to an ignition system73/116MOTOR AND ENGINE TESTINGExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Harvey, Jack B. Attorney, Agent or FirmInternational ClassesF02P 17/12 (20060101)F02P 11/00 (20060101) F02P 11/06 (20060101) F02P 17/00 (20060101) AbstractA method of testing spark plugs in an engine is described. The engine is driven by its starter motor or other motor while ignition voltage is applied, the throttle is open and the fuel is cut off. This loads the spark plugs to reveal defects not otherwise apparent. Abnormally high or low plug peak voltages as well as abnormal arc durations are detected and counted and the counts are displayed. A microprocessor based measuring instrument coupled to capacitive pickups adjacent the spark plug wires and to the engine distributor evaluates the spark voltage and duration characteristics and displays the fault data. | |
