Ignition system for internal combustion engine
AssigneeNippondenso Co., Ltd.
InventorIwao Takaki
Life of this patent
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Abstract
An ignition system for an internal combustion engine in which the primary voltage applied across the primary winding of the ignition coil is detected together with the secondary current flowing through the secondary winding of the ignition coil, and the electrical characteristic of the secondary circuit of the ignition coil supplying the arc energy is calculated on the basis of the detected signals thereby controlling the primary current supplied to the primary winding of the ignition coil on the basis of the result of calculation, so that the secondary circuit of the ignition coil can exhibit the desired electrical characteristic for supplying the arc energy of desired level.
Claims16
An ignition system for an internal combustion engine comprising an ignition signal generator generating an ignition signal in synchronism with the rotation of the engine, a power transistor unit turned on-off in response to the ignition signal generated from said ignition signal generator, an ignition coil including a primary winding and a secondary winding electrically isolated from each other, the primary winding being connected to said power transistor unit turned on-off to interrupt the primary current supplied to the primary winding of said ignition coil, a spark plug connected to one end of the secondary winding of said ignition coil, a secondary current detecting resistor connected between the other end of the secondary winding of said ignition coil and an earth potential point for detecting the secondary current flowing through the secondary winding of said ignition coil, a calculating circuit receiving both of the secondary current detected by said secondary current detecting resistor and the primary voltage detected by a primary voltage resistor connected to a grounded side end of the primary winding of said ignition coil as its input signals for calculating, on the basis of these input signals, an ignition control value representing the characteristics of the secondary electrical circuit of said ignition coil, and means responsive to the output signal from said calculating circuit for controlling the high voltage applied across said spark plug.
Dependencies are inferred from the claim text.