Nippondenso Co., Ltd.

Shigeya Abe

Teruyoshi Ito

Michio Iyoda

Toshio Tanaka

Kouichi Sasaki

Shinro Torii

Tsuneo Kato

In an ignition system including an ignition distributor integrated with an ignition coil, an electrical conductor linking leakage magnetic flux of the ignition coil is arranged on the outer periphery of the coil of an electromagnetic pickup to have a current conducting path around the axis of the coil. An eddy current is induced in the conductor by the leakage magnetic flux to generate magnetic flux in the direction opposite to the leakage magnetic flux of the ignition coil by the eddy current, thereby reducing a noise voltage generated in the electromagnetic pickup.

Ignition system including ignition distributor integrated with ignition

A control signal the value of which gradually changes in response to the turning on of a switching element connected in series to the primary winding circuit of an ignition coil is generated. By use of this control signal, the voltage across the primary winding is caused to rise slowly when the switching element is on, thus preventing an unnecessary high voltage from being generated across the secondary winding of the ignition coil.

Ignition system for internal combustion engine

A contactless ignition system for an internal combustion engine including an ignition signal generator having two pickup coils which are connected in series or parallel and oppositely in polarity to each other so as to be responsive to the rotation of a signal rotor in order to generate respective AC signals with one signal occurring at an intermediate position of the other, an input circuit disposed so as to be turned on or off when the AC signal from the ignition signal generator exceeds predetermined values in the positive and negative directions, respectively, an inverter circuit disposed to invert the output of the input circuit, first and second output circuits for generating a first output to turn on or off responsive to the output of the input circuit and a second output to turn off or on responsive to the output of the inverter circuit, and first and second ignition coils respectively responsive to the first and second outputs each so as to switch on and off the primary current therethrough.

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Kariya, Japan

Shigeya Abe