Originally posted by alexaescht
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This is seperate to DPF regeneration. Most common rail diesels will inject several small injctions instead of 1 big one during the compression stroke and if needed 2 to start a burn on the exhaust stroke. if a burn is started the EGR which directs exhaust gas into the intake is closed. For regeneration to take place the exhaust needs to reach over 600 degrees. So cooling the charge air would not help so EGR is shut. NOx gases will go up during this time.
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