An ignition device for engine according to the present invention performs continuous spark discharge of an ignition plug by using a multiplex signal, an integration signal or a control signal. In the multiplex signal, discharge continuous signals IGW#1 to 4 for cylinders of the engine have been mult
An ignition device for engine according to the present invention performs continuous spark discharge of an ignition plug by using a multiplex signal, an integration signal or a control signal. In the multiplex signal, discharge continuous signals IGW#1 to 4 for cylinders of the engine have been multiplexed. In the integration signal, a discharge continuous signal IGW and a secondary current instruction signal IGA have been added to an ignition signal IGT. In the control signal, the secondary current instruction signal IGA has been added into the multiplex signal or the integration signal. This structure can reduce the total number of signal lines connected between an ECU and a controller, and further reduce a signal line to transmit the secondary current instruction signal IGA.
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1. An ignition device for internal combustion engines comprising: a main ignition circuit performing power supply control of a primary coil in an ignition coil to generate spark discharge in a corresponding ignition plug, the ignition coil being arranged in a cylinder of a multi-cylinder internal co
1. An ignition device for internal combustion engines comprising: a main ignition circuit performing power supply control of a primary coil in an ignition coil to generate spark discharge in a corresponding ignition plug, the ignition coil being arranged in a cylinder of a multi-cylinder internal combustion engine;an energy supply circuit supplying electric energy to the primary coil during the spark discharge started by the operation of main ignition circuit in order to supply a secondary current to a secondary coil of the ignition coil, and to maintain continuously the spark discharge initiated by the operation of the main ignition circuit;a multiplex signal transmission section generating a multiplex signal in which at least two cylinder discharge continuous signals have been multiplexed, and transmitting the generated multiplex signal; anda cylinder signal extraction section receiving the multiplex signal and extracting the cylinder discharge continuous signals from the received multiplex signal,wherein the ignition device performs the spark discharge of the ignition plug continuously on the basis of the cylinder discharge continuous signals. 2. The ignition device for internal combustion engines according to claim 1, wherein the multiplex signal transmission section adds a secondary current instruction signal representing a secondary current instruction value into the multiplex signal, and transmits the multiplex signal, and the energy supply circuit maintains the secondary current supplying in the secondary coil of the ignition coil within a target current range on the basis of the secondary current instruction value indicated by the secondary current instruction signal. 3. The ignition device for internal combustion engines according to claim 1, wherein the multiplex signal transmission section generates the multiplex signal in which all of the cylinder discharge continuous signals have been multiplexed. 4. An ignition device for internal combustion engines comprising: a main ignition circuit performing power supply control of a primary coil in an ignition coil to generate spark discharge in a corresponding spark plug;an energy supply circuit supplying electric energy to the primary coil during the spark discharge started by the operation of main ignition circuit in order to supply a secondary current in a secondary coil of the ignition coil, and to maintain continuously the spark discharge initiated by the operation of the main ignition circuit;an integral signal transmission section generating an integration signal for each cylinder in which a discharge continuous signal as an instruction signal of performing continuous spark discharge has been added to an ignition signal as an instruction signal for main ignition operation of the spark plug, and transmitting the generated integration signal for each cylinder through a signal line; anda signal separation section receiving the integration signal (IGC) through the signal line, and separating the ignition signal and the discharge continuous signal from the received integration signal, outputting the ignition signal to the main ignition circuit, and the discharge continuous signal to the energy supply circuit. 5. The ignition device for internal combustion engines according to claim 4, wherein the integral signal transmission section generates and outputs the integration signal in which the discharge continuous signal and the secondary current instruction signal representing a secondary current instruction value have been added to the ignition signal, the signal separation section receives the integration signal, separates the secondary current instruction signal from the received integration signal, and outputs the secondary current instruction signal, andthe energy supply circuit maintains the secondary current within a target range on the basis of the secondary current instruction value indicated by the received secondary current instruction signal. 6. The ignition device for internal combustion engines according to claim 4, wherein the integral signal transmission section generates the ignition signal having a stair structure of a signal level thereof so as to add the discharge continuous signal into the ignition signal. 7. The ignition device for internal combustion engines according to claim 5, wherein integral signal transmission section generates the ignition signal having a stair structure of the signal level thereof so as to add the discharge continuous signal and the secondary current instruction signal into the ignition signal. 8. The ignition device for internal combustion engines according to claim 5, wherein the ignition signal instructs an energy accumulation period during which electromagnetic energy is accumulated in the primary coil by the main ignition circuit, and the energy accumulation period is started at a rising timing of the integration signal, and the secondary current instruction value is determined on the basis of a signal level of the integration signal in a predetermined period which is started at a rising timing of the integration signal. 9. An ignition device for internal combustion engines comprising: a main ignition circuit performing power supply control of a primary coil in an ignition coil to generate spark discharge in a corresponding spark plug;an energy supply circuit supplying electric energy to the primary coil during the spark discharge started by the operation of main ignition circuit in order to supply a secondary current in a secondary coil of the ignition coil, and to maintain continuously the spark discharge initiated by the operation of the main ignition circuit;an integral signal transmission section generating an integration signal for each cylinder in which a discharge continuous signal as an instruction signal of performing continuous spark discharge has been added to an ignition signal as an instruction signal for main ignition operation of the spark plug, and transmitting the generated integration signal for each cylinder through a signal line; anda signal separation section receiving the integration signal through the signal line, and separating the ignition signal and the discharge continuous signal from the received integration signal, outputting the ignition signal to the main ignition circuit, and the discharge continuous signal to the energy supply circuit. 10. The ignition device for internal combustion engines according to claim 9, wherein the integral signal transmission section transmits the integration signal in which a secondary current instruction signal representing a secondary current instruction value and the discharge continuous signal have been added to the ignition signal, and the energy supply circuit maintains a secondary current within a target range on the basis of the secondary current instruction value. 11. The ignition device for internal combustion engines according to claim 9, wherein the integral signal transmission section generates the ignition signal having a stair structure of the signal level thereof so as to add the discharge continuous signal into the ignition signal. 12. The ignition device for internal combustion engines according to claim 10, wherein the integral signal transmission section generates the ignition signal having a stair structure of the signal level thereof so as to add the discharge continuous signal and the secondary current instruction signal into the ignition signal.
Petruska, David C.; Stewart, Doyle Kent; Wegner, Monte Lee; Eberhardt, Gerald Michael, Multiplexing drive circuit for an AC ignition system with current mode control and fault tolerance detection.
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