Electrical circuit
First Claim
1. An electrical circuit for connection to a high tension lead which is connected to a spark plug of a spark ignition internal combustion engine, the circuit comprising a capacitor, the capacitance of said capacitor when employed along being such that if a high voltage pulse is applied to the high tension lead, the voltage developed across the capacitor and the charge stored by the capacitor are sufficient to initiate and sustain an ignition spark, wherein there is a resistor connected in parallel with said capacitor.
1 Assignment
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Accused Products
Abstract
An electrical circuit for connection to a high tension lead which is connected to a spark plug of a spark ignition internal cumbustion engine. The circuit comprises a capacitor (11) the capacitance of which is such that, if a high voltage pulse is applied to the high tension lead, the voltage developed across the capacitor and the charge stored by the capacitor are sufficient to initiate and sustain and ignition spark. The capacitor may be voltage dependent to achieve an optimised spark current characteristic. A resistor (12), such as a voltage dependent resistor, and a voltage controlled discharge device (13) may be connected in parallel with the capacitor.
50 Citations
19 Claims
- 1. An electrical circuit for connection to a high tension lead which is connected to a spark plug of a spark ignition internal combustion engine, the circuit comprising a capacitor, the capacitance of said capacitor when employed along being such that if a high voltage pulse is applied to the high tension lead, the voltage developed across the capacitor and the charge stored by the capacitor are sufficient to initiate and sustain an ignition spark, wherein there is a resistor connected in parallel with said capacitor.
- 2. An electrical circuit for connection to a high tension lead which is connected to a spark plug of a spark ignition internal combustion engine, the circuit comprising a capacitor, the capacitance of said capacitor when employed alone being such that if a high voltage pulse is applied to the high tention lead, the voltage developed across the capacitor and the charge stored by the capacitor are sufficient to initiate and sustain an ignition spark, wherein there is a voltage controlled discharge device connected in parallel with said capacitor.
Specification