Ignition apparatus for internal combustion engine
AssigneeDenso Corporation
InventorAkimitsu Sugiura
Life of this patent
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Abstract
Disclosed is an ignition apparatus for an internal combustion engine. The ignition apparatus includes a spark plug, an ignition coil and a controller. The spark plug has an auxiliary combustion chamber in which a discharge gap is arranged. The ignition coil is configured to apply a voltage to the spark plug. The controller is configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap within a period from a compression stroke to an expansion stroke of the internal combustion engine.
Claims9
An ignition apparatus for an internal combustion engine, the ignition apparatus comprising:
- a spark plug having an auxiliary combustion chamber in which a discharge gap is arranged;
- an ignition coil configured to apply a voltage to the spark plug;
- and
- a controller configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap within a period from a compression stroke to an expansion stroke of the internal combustion engine,
- wherein:
- in the multiple-discharge mode, the controller causes the discharge to be generated at least once in the expansion stroke;
- a gas flow speed in the discharge gap is lower during the discharge pause period than during discharge periods immediately before and immediately after the discharge pause period;
- the discharge pause period is set to a low flow speed period during which the gas flow speed in the discharge gap is lower than a predetermined flow speed threshold;
- and
- in the multiple-discharge mode, a first discharge is generated immediately before a compression top dead center (TDC), then the discharge pause period is provided between a time instant immediately before the TDC and a time instant immediately after the TDC, and then a second discharge is generated immediately after the TDC.
An ignition apparatus for an internal combustion engine, the ignition apparatus comprising:
- a spark plug having an auxiliary combustion chamber in which a discharge gap is arranged;
- an ignition coil configured to apply a voltage to the spark plug;
- and
- a controller configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap within a period from a compression stroke to an expansion stroke of the internal combustion engine,
- wherein:
- in the multiple-discharge mode, the controller causes the discharge to be generated at least once in the expansion stroke;
- the discharge pause period is set to start when a discharge sustaining voltage or an attenuation rate of discharge current of the discharge generated immediately before the discharge pause period becomes lower than a predetermined threshold;
- and
- in the multiple-discharge mode, a first discharge is generated immediately before a compression top dead center (TDC), then the discharge pause period is provided between a time instant immediately before the TDC and a time instant immediately after the TDC, and then a second discharge is generated immediately after the TDC.
Dependencies are inferred from the claim text.