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| Number | Title | Issue Date |
| 6969995 | Measuring device for ignition voltages The invention relates to a measuring device with a sensor (4) for monitoring the ignition voltage of an associated cylinder of an internal combustion engine, said sensor (4) being arranged along the ignition conductor (12), between the spark plu... | 11/29/2005 |
| 6948484 | Capacitor discharge ignition device A capacitor discharge ignition device is provided with a capacitor for storing charge to produce ignition energy; ignition coils that receive charge released from the capacitor on the primary side and generate a high voltage on the secondary side; a switching elemen... | 09/27/2005 |
| 6281682 | Sensor for detecting ignition current and ion current in ignition secondary circuit An ignition secondary sensor is provided which is disposed in a high voltage path between an ignition coil and a spark plug for use with a detecting circuit for detecting ignition current and ion current flowing through a spark plug. The sensor comprises ... | 08/28/2001 |
| 5710512 | Structure and production process for secondary voltage detector for engine A detector for detecting a secondary voltage supplied to a spark plug of an engine comprises a rubber tube mounted on a high tension cord and equipped with a detecting electrode, and a shield case or shield layer enclosing the rubber tube. The rubber tube... | 01/20/1998 |
| 5497092 | Apparatus for detecting and displaying engine speed Apparatus for detecting and displaying the revolution speed of an internal combustion engine having an electrical distribution system including at least one spark plug includes a hand held housing having a digital display. An antenna is connected to the h... | 03/05/1996 |
| 5438269 | Sparking voltage detecting device having an embedded conductive member A sparking voltage detecting device for an internal combustion engine having an ignition system having at least one secondary side high-tension cord, is mounted on the secondary side high-tension cord, for detecting sparking voltage generated in the engin... | 08/01/1995 |
| 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 |
| 5017874 | Method and apparatus for detecting and indicating anomalies in the operation of the ignition systems of internal combustion engines The method and apparatus allows the detection and indication of anomalies in the operation of the ignition system of an internal combustion engine including a plurality of spark plugs, each of which receives a periodic high-voltage pulse output by a high-... | 05/21/1991 |
| 4942362 | Apparatus for testing ignition systems An analyzation apparatus for ignition systems that has a pulse detector circuit that generates and converts an AC signal into a DC signal, filters unwanted signals and allows the user to adjust the amplitude of the signal to accommodate differing ignition... | 07/17/1990 |
| 4783991 | Ignition and combustion engine performance monitor A semiautomated diagnostic apparatus primarily used with ignition systems on internal combustion engines is novel in that every firing is examined for peak breakdown voltage level in a synchronized sequential manner to create a display of abnormalities an... | 11/15/1988 |
| 4758790 | Engine analysers for capacitor discharge ignition systems An adaptor for use in conjunction with an internal combustion engine having a capacitor discharge ignition system provides a substitute high voltage pulse coincident with the high tension pulse of the engine ignition system but having a period which is su... | 07/19/1988 |
| 4449100 | Ignition system tester This specification discloses testing vehicle primary ignition systems by taking the integral of the primary spark plug firing voltage versus time over a time period when the spark should occur. To determine when an integration output should be evaluated, ... | 05/15/1984 |
| 4401948 | Diagnostic apparatus for internal combustion engine ignition system A diagnostic apparatus for an internal combustion engine ignition system measures the rise of the secondary voltage at the ignition coil represented by time lapse between initiation of the secondary voltage rising and occurrence of break and the ignition ... | 08/30/1983 |
| 4377785 | Device for diagnosing ignition system for use in internal combustion engine An ignition system for internal combustion engine, which controls the ignition coil primary current according to the magnitude of the floating capacitance in the secondary side wiring section of the ignition coil, by determining the floating capacitance f... | 03/22/1983 |
| 4349782 | Shielded differentiator for automotive ignition applications A portable electronic device for application in the diagnosis of automotive ignitions system failures is described. A novel probe is described, which can detect and differentiate the voltage on a typical ignition cable or spark plug. Means are provided to... | 09/14/1982 |
| 4305038 | Ignition circuit tester An ignition circuit tester including a pick-up coil assembly for inductive coupling with and location closely along a circuit element to be tested, an amplifier circuit for amplifying a signal picked up by the coil assembly, and a meter to indicate the si... | 12/08/1981 |
| 4204152 | High and low voltage measuring apparatus employing a single display and impedance matching Apparatus for measuring a high voltage in an ignition circuit, in which voltage dividing means has a first arm for connection to a point of measurement in said circuit and a second arm connected to a rectifying means. The output of the rectifying means is... | 05/20/1980 |
| 3984768 | Apparatus for high voltage resistance measurement Improved method and apparatus for measuring the effective operating resistance of an unknown resistance element to which repetitive high voltage pulses are normally applied during operation. As each high voltage pulse is applied to the element, the voltag... | 10/05/1976 |
