Exhaust gas purification system for internal combustion engine
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United States of America Patent
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Nov 3, 2020
Grant Date -
Apr 30, 2020
app pub date -
Sep 17, 2019
filing date -
Oct 30, 2018
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Abstract
At the start of the engine, when the temperature of the catalyst is less than the activation temperature, control for activating the catalyst (i.e., activation control) is performed. In the activation control, the first and second discharge actions of the ignition apparatuses are controlled. The first discharge action is performed to ignite the mixed gas in the cylinder. The second discharge action is performed to generate ozone. The first discharge action is performed immediately after the start of the cranking. The first discharge action is performed in the crank angle section at the retard side rather than the compression TDC. The first discharge action is performed in every cylinder. The second discharge action is performed before the start of the cranking. The second discharge action is performed in the other cylinder except for the initial combustion cylinder.
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