Patent ID: 6951100
Filing Date: 2005-10-04
Classification: F01N,F02D,F02M

Abstract:
1. An exhaust gas cleaning system for an internal combustion engine, the exhaust gas cleaning system comprising: a particulate filter disposed in an exhaust passage of the engine for collecting and accumulating particulate matters included in exhaust gas; an operating condition detecting means for detecting an operating condition of the engine; particulate matter accumulation quantity detecting means for detecting a quantity of the particulate matters accumulated in the particulate filter; temperature increasing means for increasing temperature of the particulate filter; temperature increase controlling means for operating the temperature increasing means based on detection results of the operating condition detecting means and the particulate matter accumulation quantity detecting means; and particulate matter accumulation inhibiting means included in the temperature increase controlling means for performing an operation for inhibiting the accumulation of the particulate matters to the particulate filter when the particulate matters accumulated in the particulate filter exceeds a predetermined quantity and the engine is under a predetermined operating condition; wherein the temperature increase controlling means stops temperature increasing operation performed with the temperature increasing means if an output torque of the engine is equal to or greater than a first threshold in the case where the quantity of the accumulated particulate matters exceeds the predetermined quantity, wherein the temperature increase controlling means performs the temperature increasing operation with the temperature increasing means if the output torque of the engine is less than the first threshold and is equal to or greater than a second threshold, which is less than the first threshold, in the case where the quantity of the accumulated particulate matters exceeds the predetermined quantity, and wherein the temperature increase controlling means performs an operation with the particulate matter accumulation inhibiting means if the output torque of the engine is less than the second threshold in the case where the quantity of the accumulated particulate matters exceeds the predetermined quantity, without performing the temperature increasing operation with the temperature increasing means.