Internal-combustion engines – Igniters – Sparkers
Patent
1984-06-19
1985-05-07
Dolinar, Andrew M.
Internal-combustion engines
Igniters
Sparkers
123417, F02P 108
Patent
active
045151180
ABSTRACT:
To provide operating energy to an ignition instant control circuit, for example a microprocessor (22) which controls operation of a semiconductor switching stage (20) without detracting from the energy output of the magneto coil (14), the energy in the voltage half-wave (negative) which does not supply ignition energy is used to charge a storage capacitor (24) to a charging network (25, 26), with a limit being determined by a Zener diode (29); the ignition instant is calculated by the control circuit, typically a microprocessor (22), which receives operating energy from across the capacitor, and a control input at a control terminal (30) which is connected to an insulated gate semiconductor switch, typically an MOS-FET (31) having its drain (D) connected to the control terminal (30) of the microprocessor and through a coupling capacitor to the output terminal (24a) of the energy supply circuit; its source (S) connected to that one of the ignition winding terminals (14a) which is common to the energy supply circuit and the terminal of the capacitor (24) remote from the output voltage supply terminal (24a); and the gate (G) of which is controlled through a coupling network (33, 34, 35, 36) connected across the primary winding (14) of the magneto.
REFERENCES:
patent: 4378769 (1983-04-01), Haubner et al.
patent: 4462356 (1984-07-01), Hirt
Haubner Georg
Schmid Hans-Dieter
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