US 6,484,692 B2Granted

Ignition control system

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsHideki Umemoto, Tadayuki Saga, Tatsuji Irie, Wataru Fukui

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Abstract

An ignition control system is provided, which includes: an engine speed detector (101) for calculating an engine speed according to an engine crank angle signal (100); a current supply start controller (102) for outputting a proper current supply start timing signal corresponding to the engine speed to an ignition coil (5); a current supply finish controller (103) for outputting a proper current supply timing signal corresponding to the engine speed to an ignition coil; an ignition coil controller (104) for controlling supply of power to the ignition coil (5) according to the current supply start timing signal and the current supply finish timing signal; and an overspeed determination device (105) for outputting an overspeed determination signal when determining that the engine speed is in excess of a predetermined limit value. The overspeed determination signal prohibits starting the supply of current, and retards the current supply finish timing to such a degree as to decrease engine torque.

Claims5

Dependent claims

An ignition control system comprising:

engine speed detecting means for calculating an engine speed according to an engine crank angle sensor signal;
current supply start control means for outputting a proper current supply start timing signal corresponding to the engine speed to an ignition coil;
current supply finish control means for outputting a proper current supply finish timing signal corresponding to the engine speed to the ignition coil;
ignition coil control means for controlling supply of current to the ignition coil according to the signals outputted from said current supply start control means and said current supply finish control means;
and
overspeed determination means for outputting an overspeed determination signal when determining that the engine speed calculated by said engine speed detecting means is in excess of a predetermined limit value,
wherein said current supply finish control means resets a timing for finishing the supply of current to the ignition coil being supplied with current to a timing on and after a time indicated by the current supply finish timing signal to thereby inhibit engine from revolving.

4 more elements

Dependencies are inferred from the claim text.