Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Patent
1996-01-11
1996-12-17
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
F02P 306
Patent
active
055842801
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an ignition device of the capacitor discharge type for an internal combustion engine which is adapted to control an ignition timing of an internal combustion engine by means of a microcomputer.
BACKGROUND ART
In general, an ignition device of the capacitor discharge type for an internal combustion engine includes a capacitor for accumulation of ignition energy which is arranged on a side of a primary winding of an ignition coil, a capacitor charging circuit for charging of the capacitor and a discharge switch which is turned on upon feeding of an ignition signal thereto to cause charges in the capacitor to be discharged to the primary winding of the ignition coil, wherein charges in the ignition energy accumulation capacitor are discharged to the primary winding of the ignition coil to cause a high voltage to be induced across a secondary winding of the ignition coil, resulting in ignition operation of the internal combustion engine being carried out.
Such an ignition device may be constructed in such a manner that a magneto mounted on the internal combustion engine is provided therein with an exciter coil, which acts as an ignition power supply to charge the ignition energy accumulation capacitor. In such construction, a rotation angle period during which the exciter coil generates an output voltage of a positive half cycle and that during which it generates an output voltage of a negative half cycle are defined to be a charge period and a non-charge period, respectively, so that the capacitor may be charged by means of an output voltage of the exciter coil obtained during the charge period.
In recent years, an internal combustion engine is requested to meet requirements such as purification of exhaust gas, an improvement in fuel consumption rate, a decrease in noise, an increase in output and the like. In order to meet the requirements, it is required to use a microcomputer to precisely control an ignition timing of the internal combustion engine in view of control conditions such as an engine speed and the like.
A device for controlling the ignition timing by means of a microcomputer is disclosed in, for example, Japanese Patent Application Laid-Open Publication No. 262366/1989. The device disclosed is adapted to control the ignition timing depending on a degree of opening of a throttle valve. Another device for the same purpose is disclosed in Japanese Patent Application Laid-Open Publication No. 163443/1989, which is constructed so as to control the ignition timing in view of both an engine speed and a degree of opening of a throttle valve.
In the following description, the ignition timing will be indicated by a rotation angle of an output shaft (normally, a crank shaft) of the internal combustion engine.
An ignition device for an internal combustion engine which is adapted to control an ignition timing of the internal combustion engine by means of a microcomputer is constructed so as to realize both an engine speed operation means for operating an engine speed or a rotational speed of the internal combustion engine and an ignition timing operation means for operating the ignition timing in view of the engine speed by means of the microcomputer to feed an ignition circuit with an ignition signal at an rotation angle corresponding to an ignition timing operated by the ignition timing operation means, to thereby carry out ignition operation of the engine. In order to ensure that the ignition device carries but such ignition operation, it is required that coincidence of a rotation angle of the crank shaft with the operated ignition timing is detected at every rotation of the engine.
In view of the foregoing, in the conventional ignition device, a predetermined rotation angle position of the crank shaft of the internal combustion engine is defined to be a reference position, so that an ignition timing of the engine at each engine speed is operated in the form of a length of time required when the engine rotates from the reference position to a rotation angle c
REFERENCES:
patent: 4858585 (1989-08-01), Remmers
patent: 4924381 (1990-05-01), Piteo et al.
patent: 5024204 (1991-06-01), Dykstra
patent: 5050553 (1991-09-01), Erhard
patent: 5070839 (1991-12-01), Okuda
patent: 5433184 (1995-07-01), Kinoshita et al.
patent: 5493496 (1996-02-01), James et al.
Kinoshita Atsufumi
Sato Norio
Kokusan Denki Co. Ltd.
Nelli Raymond A.
LandOfFree
Ignition device of capacitor discharge type for internal combust does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ignition device of capacitor discharge type for internal combust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ignition device of capacitor discharge type for internal combust will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1984176