Ignition timing control device for internal-combustion engines

Abstract

An ignition timing control device for internal-combustion engines which is provided in an internal-combustion engine to control the ignition timing of the internal-combustion engine, such as a gasoline engine and a diesel engine mounted as an automotive engine, and to control what is called a knocking phenomenon including abnormal sound and abnormal vibration resulting from abnormal combustion in the combustion chamber, and includes a knocking sensor which senses knocking information of the internal-combustion engine, a knocking discriminator which discriminates the knocking phenomenon in each cylinder of the engine sensed by the knocking sensor, a processing device which performs specific processing in accordance with the knocking phenomenon thus discriminated, a phase shifter which performs the phase shift control of an ignition signal by the output of this processing device, and a switching circuit which turns on and off the ignition coil by the output of this phase shifter; the processing device including an integrator which calculates the integral voltage by the discriminator output and resets this integral voltage correspondingly to ignition operation, and an integrator which integrates the integral voltage thus reset, and furthermore the processing device is provided, when required, with a subtractor which subtracts a specific value corresponding to for example an engine noise signal from the output of the discriminator.

Dependencies are inferred from the claim text.