Patent ID: 6932064

Claim:
A capacitor discharge ignition system for an engine having an ignition device, said capacitor discharge ignition system including: an ignition coil having a primary winding and a secondary winding for coupling to said ignition device; an ignition capacitor coupled to said primary winding; a charge coil coupled to said ignition capacitor for generating a charge signal in synchronism with operation of said engine to charge said ignition capacitor; a trigger circuit for generating a trigger signal in synchronism with operation of said engine and being in circuit with said ignition capacitor and said primary winding for discharging said ignition capacitor through said primary winding; a timing circuit connected to said trigger circuit for controlling timing of said trigger signal as a function of engine speed, said timing circuit including: a timing coil for generating a timing signal in synchronism with operation of said engine; and a switch having primary current conducting electrodes in circuit with said trigger circuit and further having a control electrode coupled to said timing coil for at least partially shorting operation of said trigger circuit.