Patent ID: 9695730
Date: 2017-07-04
CPC Classifications: B01D,F01N,F02D,Y02T

Claim:
1. An exhaust gas purifying apparatus comprising: an oxidative catalyst and a filter that are disposed in an exhaust gas path of an engine; a fuel injecting device that injects fuel according to a fuel injection pattern; and a control device that is configured to estimate a deposition amount of a particulate matter, the control device setting the fuel injection pattern, wherein the control device is operable to run a first recovery mode and a second recovery mode which are control modes to set the fuel injection pattern including post-injection to recover the filter, the second recovery mode is run when the estimated deposition amount exceeds a starting threshold value that is larger than a reference threshold value, and in the second recovery mode, a post-injection amount is set to be a first injection amount when the deposition amount is larger than the reference threshold value, and the post-injection amount is set to be a second injection amount that is a larger injection amount than the first injection amount when the deposition amount is equal to the reference threshold value or smaller, and the first recovery mode is run when the deposition amount exceeds the reference threshold value and is equal to the starting threshold value or smaller, and the post-injection amount is maintained at a constant value regardless of the magnitude of the deposition amount.