Electronic ignition advance circuit - uses phase locked loop generating ramp output with falling edge synchronised with that of input pulse

摘要

Pulses generated in a pickup synchronised with the engine crankshaft are fed to a circuit for generating a voltage proportional to the desired advance and to a phase locked loop. This is adapted to generate, at its output, a ramp synchronised with the input pulses, with the ramp output and proportional voltage supplied to a comparator, the output of which generates firing pulses which are advanced as a function of engine operation for use in the electronic ignition system.