Ignition device for internal combustion engine

Abstract

The invention provides an ignition device for an internal combustion engine including an ignition circuit (6) which generates high voltage for ignition and an ignition position control portion (10) for controlling ignition position at the time of providing ignition signal (Si). In the invention, in order to avoid recoil at the time of the internal combustion engine starting, a signal generator (2) is provided that generates a first pulse signal (P1), and a second pulse signal (P2) and a third pulse signal (P3) having a different polarity from the first pulse signal (P1), and the ignition position control portion includes: start time ignition signal providing means (11) for providing an ignition signal to an ignition circuit when the signal generator (2) successively generates the pulse signals having the same polarity at the start of the engine; idling time ignition signal providing means (12) for providing an ignition signal to the ignition circuit in response to the second pulse signal (P2) when first ignition at the start is completed and a rotational speed is an idling rotational speed or less; and normal rotation time ignition signal providing means (13) for arithmetically operating an ignition position and providing an ignition signal to the ignition circuit at a crank angle position that matches the arithmetically operated ignition position when the rotational speed of the internal combustion engine exceeds the idling rotational speed.

Description

technical field [0001] The present invention relates to an ignition device for an internal combustion engine that uses a microprocessor to control the ignition position of the internal combustion engine (the crank angle position of the ignition internal combustion engine). Background technique [0002] An ignition device for an internal combustion engine, as disclosed in JP-A-2001-200776, consists of an ignition circuit that controls the primary current of an ignition coil to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given, and an ignition position control unit that controls a crank angle position (ignition position) at which an ignition signal is supplied to the ignition circuit. [0003] In an internal combustion engine, a signal generator is installed to obtain engine rotation information including rotation speed information and rotation angle information. Signal generators usually consist of induction generato...

AI Technical Summary

Problems solved by technology

However, in this invention, since in addition to the signal generator, it is necessary to provide a singular point detection circuit that detects the zero crossing point or the peak point of the output voltage of the alternator driven by the internal combustion engine as a singular point, there is a hardware limitation. complex questions

[0015] In addition, since the phase of a singular point such as a zero-crossing point or a peak point of the output voltage of the alternator fluctuates due to the output current of the generator during idling, when determining the ignition position during idling based on the output signal of the singular point detection circuit, The ignition position will change during idling, and there is a possibility of unstable idling operation

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