Antiparasitic ignition device for cars
OwnerFerdy P. Mayerinventor
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Abstract
A device and a method are provided for improving the operation of ignition devices, in which the parasitic waves causing interference are attenuated by means of a combination of resistors, connected in the primary and/or secondary of the ignition circuit (high voltage circuit of the coil). According to the invention, frequency sensitive resistor cables and a direct or simulated secondary resistance (formed by a small resistance placed in the primary of the ignition circuit) are substituted for the classical secondary resistive ignition cables and/or lumped resistors. Ignition and RFI-radiation can so be optimized by reducing ignition energy to its original level, and by adapting the last to the actual need i.e. varying its value in accordance with engine rpm etc.
Claims30
In an internal combustion engine ignition system of the type including:
- a DC power source supplying current through an ignition coil and a distributor to the engine's spark plugs;
- the coil having a low voltage primary winding circuit connected to the DC source, and a high voltage secondary winding circuit connected to the distributor;
- and means for repetitively interrupting the current flowing through the primary circuit;
- the improvement comprising the combination of:
- frequency selective ignition wires interconnecting the distributor and the spark plugs, said wires exhibiting low resistance to direct and lower frequency currents below the radio frequency range and high resistance to higher current frequencies in the radio frequency range;
- and
- resistor means electrically connected to the ignition coil for reducing the ignition power flowing through the secondary circuit to the minimum value required for substantially zero ignition reserve, thereby minimizing both the wear on the spark plugs and also secondary parasitic radiations, both of which would otherwise occur but for the presence of said resistor means, said zero ignition reserve being a value of ignition power which is the minimum necessary for efficient spark ignition.
A method of improving the ignition efficiency of, and reducing the radio frequency interference radiation from, an internal combustion engine designed for operation with an ignition system including an ignition coil having a high voltage secondary circuit containing resistive components, including spark plugs and ignition wires, comprising the steps of:
- replacing the resistive ignition wires with frequency selective ignition wires which have the characteristic of presenting a low resistance to direct currents and lower frequency currents while attenuating radio frequency currents;
- replacing the remaining resistive components with standard, non-resistive components;
- and
- connecting in circuit with the ignition coil a separate resistor having an optimum resistance value such that the ignition current flowing through said secondary circuit to the spark plugs is large enough efficiently to fire the spark plugs and low enough to minimize both the wear of the spark plugs and also secondary parasitic radiations.
In an internal combustion engine ignition system including a high voltage power source supplying power through a secondary winding circuit of a high voltage transformer and a distributor to the engine's spark plugs, a low-voltage D.C. source connected to the low-voltage primary winding circuit of the transformer, and means for forming current pulses in the primary circuit, the improvement for optimizing the ignition power supplied to the spark plugs by reducing said ignition power to the minimum value required to obtain substantially zero ignition reserve for different operating conditions of the engine, said zero ignition reserve being a value of ignition power which is the minimum necessary for efficient spark ignition, whereby spark plug life is maximized and radio frequency interference is reduced by supplying the minimum ignition power required for efficient ignition at each engine operating condition, said improvement comprising:
- controllable impedance means connected to the transformer for selectively decreasing the power delivered to the spark plugs in accordance with impedance values corresponding to those required to produce said substantially zero ignition reserve for each of said different operating conditions of the engine;
- and
- control means responsive to said different engine operating conditions for varying said impedance means to produce the impedance value required to produce said minimum value of ignition power required to obtain said substantially zero ignition reserve for each engine operating condition.
A method of optimizing the ignition power delivered by an ignition circuit to the spark plugs of an internal combustion engine for a plurality of different engine operating conditions so that only the minimum power required for substantially zero ignition reserve is delivered to the spark plugs, said zero ignition reserve being a value of ignition power which is the minimum necessary for efficient spark ignition, said method comprising the steps of:
- sensing the different operating conditions of the engine;
- and
- adaptively varying the impedance of the ignition circuit in accordance with the sensed engine operating conditions to deliver said minimum ignition power for each sensed operating condition.
Dependencies are inferred from the claim text.