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| Number | Title | Issue Date |
| 5554930 | Spark plug voltage probe device in an internal combustion engine In a spark plug voltage probe device which detects a voltage applied to a spark plug installed in an internal combustion engine so as to analyze a burning condition in the internal combustion engine on the basis of the voltage applied to the spark plug, a... | 09/10/1996 |
| 5543716 | Sparkplug voltage probe for use with an internal combustion engine by clamping sparkplug cables with an insulation base In a sparkplug voltage probe device in use for an internal combustion engine, an insulator base is attached to the internal combustion engine, an upper surface of the insulator base having a plurality of grooves in which the sparkplug cables are placed. A... | 08/06/1996 |
| 5534781 | Combustion detection via ionization current sensing for a "coil-on-plug" ignition system An ionization current sensing circuit providing a way to detect the combustion event in a spark ignited engine cylinder. The presence of an output signal from the proposed circuit indicates that a flame exists and that combustion has occurred in the cylin... | 07/09/1996 |
| 5523691 | Diagnostic device for gas turbine ignition system A device for diagnosing the state of health of an ignition system is provided, where the system includes at least one spark producing channel comprising an exciter, output circuit and igniter plug. The device provides a diagnosis of the state of health fo... | 06/04/1996 |
| 5521509 | Device of estimating heat resistivity for a spark plug and a method of estimating the same In a device of estimating heat resistivity for a spark plug, an ignition spark control circuit is provided to discontinue ignition spark across electrodes of a spark plug at a predetermined intervals. A counter circuit is provided to count the times of th... | 05/28/1996 |
| 5510715 | Apparatus for determining the ignition characteristic of an internal combustion engine An apparatus for determining the ignition characteristic of combustion in an internal combustion engine having an ignition coil including an ionic current computing circuit which analyzes ionic current enabled as a result of combustion. Ionic current flow... | 04/23/1996 |
| 5492007 | Misfire detection in a spark ignition engine A method for detecting misfire in a cylinder of an internal combustion engine through the ignition system of the engine. The present invention first predicts a time-to-fire measurement for an interrogating spark, then measures the actual time-to-fire meas... | 02/20/1996 |
| 5491416 | Method and device for the measuring and monitoring of electrical spark gaps during operation Spark gap measuring and monitoring method and device, for providing, during operation, a signal indicative of the intended performance of the spark gap (1), in particular a spark plug of a combustion engine. The device includes an electrical detecting ele... | 02/13/1996 |
| 5491417 | Sparkplug voltage probe device having a capacitance compensating function for an internal combustion engine In a sparkplug voltage probe device, an insulator base is attached to the internal combustion engine, an upper surface of the insulator base having a plurality of grooves in which the corresponding cables are placed. An electrode plate is embedded in the ... | 02/13/1996 |
| 5483818 | Method and apparatus for detecting ionic current in the ignition system of an internal combustion engine A method and a circuit are provided for detecting low level ionic currents. An ionization detection voltage is applied to a spark plug and a resulting output voltage signal is sent to a threshold device. The output voltage signal is developed by a low off... | 01/16/1996 |
| 5477148 | Spark plug voltage probe device for use in an internal combustion engine In a spark plug voltage probe device which detects voltage applied to a spark plug installed in an internal combustion engine so as to analyze burning conditions in the internal combustion engine on the basis of the voltage applied to the spark plug, a ru... | 12/19/1995 |
| 5461316 | Ignition coil with misfire detecting capacitor for internal combustion engine An ignition coil has a capacitor for detecting ignition voltage of a spark-ignition internal combustion engine to determine if misfire occurs. The ignition coil has a primary winding and a secondary winding both wound around a core. A connector section, c... | 10/24/1995 |
| 5461315 | High voltage transformer for the continuous monitoring of high voltage characteristics in a combustion engine High voltage transformer, in particular an ignition coil for a combustion engine, with a conductor section carrying a high voltage with respect to a reference potential (earth) and with at least one conductor surface in the proximity of the conductor sect... | 10/24/1995 |
| 5453694 | Snap-in type sparkplug voltage probe device for use in internal combustion engine In a snap-in type spark plug voltage probe device, the insulator base has an upper half and a lower half, both ends of which are integrally connected by means of a flexible portion. The upper half and the lower half have a plurality of grooves in which sp... | 09/26/1995 |
| 5450013 | Spark plug voltage detector probe having a replaceable cable fixing portion A spark plug voltage waveform detector probe for use in an internal combustion engine and which is mounted on a secondary circuit of an ignition circuit to form static capacity therebetween so as to detect a spark plug voltage waveform. The detector probe... | 09/12/1995 |
| 5426370 | Spark plug voltage probe device for detecting a burning condition and reducing noise level in an internal combustion engine In a spark plug voltage probe device, an electrically shield casing (301) is provided in which electrical circuit boards (302) are accommodated, the shield casing (301) having an electrically conductive wall (313) connected to the ground. An insulator bas... | 06/20/1995 |
| 5418461 | Device for detecting abnormality of spark plugs for internal combustion engines and a misfire-detecting system incorporating the same A device according to an aspect of the invention detects abnormality of spark plugs of an internal combustion engine. A value related to electric resistance across a gap between electrodes of each spark plug is measured. Next, it is determined whether or ... | 05/23/1995 |
| 5397990 | Device for accurately detecting ion current of internal combustion engine by masking noise generated by an ignition coil In an ion current detecting device for an internal combustion engine, an ion current detecting circuit for detecting an ion current produced when the gas mixture is burnt by spark discharges between the electrodes of a spark plug operates to mask the dete... | 03/14/1995 |
| 5363046 | Spark plug cap with misfire detecting capacitor for internal combustion engine A spark plug cap having a capacitor for detecting ignition voltage of an internal combustion engine to determine if misfire occurs. The spark plug cap covers the terminal of a spark plug and has a conductor for carrying ignition voltage current from an ig... | 11/08/1994 |
| 5349299 | Fuel supply misfire-detecting system for internal combustion engines A misfire-detecting system detects a misfire occurring in an internal combustion engine. A value of sparking voltage for discharging a spark plug of the engine is detected. A differentiating circuit differentiates the detected value of the sparking voltag... | 09/20/1994 |
| 5317267 | Spark plug voltage probe for use with an internal combustion engine A spark plug voltage probe detects a voltage applied to a spark plug installed in an internal combustion engine so as to analyze a burning condition in the internal combustion engine on the basis of the voltage applied to the spark plug. A rubber collar (... | 05/31/1994 |
| 5271268 | Ionic current sensing apparatus A capacitor is connected to an ignition coil for an internal combustion engine so as to be charged by ignition current generated by the ignition coil. After firing of a spark plug in a cylinder by the ignition current, the voltage across the capacitor is ... | 12/21/1993 |
| 5254954 | Defect detecting apparatus and method for detecting a defect in an insulator using an electric discharge sense by an optical pickup An apparatus for detecting a defect in an insulator formed therein with an axially extending hollow section; having a hold section 2 for holding the insulator, a first electrode 3 inserted in the hollow section 1a of the insulator 1, and a second electrod... | 10/19/1993 |
| 5216369 | Ignition occurrence detecting device for use in an ignition apparatus An ignition detecting device for use in an internal combustion engine. An ignition surge current detector detects an ignition surge current due to capacitive discharge of the ignition coil. A comparator compares an output voltage detected by the ignition ... | 06/01/1993 |
| 5208541 | Spark plug firing sensor with capacitive coupling and optical pickup A sensor for detecting the firing of a spark plug while maintaining electrical isolation of electronic equipment is disclosed. In the preferred embodiment, a conductive element is attached to one electrical lead of a neon bulb. A wrap secures one end of a... | 05/04/1993 |
| 5196798 | Automotive ignition coil tester A device for testing ignition coils from automobile and other spark ignition engines is disclosed which is a small, handheld ignition coil tester powered by the battery of the engine's ignition system. The coil tester provides a visual indication of prope... | 03/23/1993 |
| 5175501 | Method of deriving a primary clock from secondary signals in a distributorless ignition system An interface for coupling an engine analyzer to an engine having a distributorless ignition system includes a pair of pickup clamps for coupling signals from respective groups of spark plug wires. A logic cell array is supplied with spark plug secondary v... | 12/29/1992 |
| 5106293 | System for detecting the condition of ignition assemblies A detector for detecting the condition of an ignition assembly in a burner is disclosed. The flame in the burner is ignited in a fuel medium by means of an electric arc across a spark gap in the ignition assembly. The assembly is substantially inaccessibl... | 04/21/1992 |
| 5001431 | Clip for holding ignition wires of different sizes In an engine analyzer system, a test probe adapted for connecting to ignition wires of different diameters. The test probe including a pick-up clip for electrically coupling to the ignition wire and clamping to large diameter ignition wires. A rotatable c... | 03/19/1991 |
| 4987771 | Misfire detection device for an internal combustion engine A misfire detection device for an internal combustion engine comprises an ionic current detection circuit which detects an ionic current caused by ignition occurring at an ignition plug for a cylinder in a multi-cylinder internal combustion engine, a gate... | 01/29/1991 |
| 4937527 | Lead assembly for a distributorless ignition interface A distributorless ignition interface unit for use with an engine analyzer for analyzing an internal combustion engine includes a processing circuit which responds to analog signals representing true and wasted firings for the cylinders of the engine under... | 06/26/1990 |
| 4825167 | Spark plug testing under dynamic load A 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... | 04/25/1989 |
| 4742306 | Engine analysers An apparatus for generating a synchronizing signal for a selected cylinder of a multi-cylinder engine having a double ended coil ignition system, including a comparator for identifying a real ignition pulse on the ignition device associated with the selec... | 05/03/1988 |
| 4434402 | Electrical equipment An igniter test unit produces a square wave voltage that is applied across a parallel circuit comprising a first capacitor and a series arrangement of a second capacitor and diodes. An inductance and a thyristor are connected across the first capacitor, i... | 02/28/1984 |
| 3990302 | Automotive ignition analyzer with cylinder of interest display An automotive ignition analyzer is disclosed with cylinder of interest of display capabilities which allows one or more cylinders to be individually selected and displayed in a stacked mode while the remaining unselected cylinders are simultaneously displ... | 11/09/1976 |
