Patent ID: 7168244
Filing Date: 2007-01-30
Classification: F01N,F02D,Y02T

Abstract:
1. A control method for an exhaust gas purification system, in an internal combustion engine, provided with a diesel particulate filter device in the exhaust passage thereof and having a diesel particulate filter control means comprising: regeneration timing judgment means for judging a regeneration timing of a filter of the diesel particulate filter device; exhaust gas temperature raising means for raising an exhaust gas temperature; and cooling water temperature detection means for detecting an engine cooling water temperature, in which said diesel particulate filter control means raises an exhaust gas temperature by the exhaust gas temperature raising means to regenerate the filter by performing a forced regeneration control, when the timing for regeneration is judged by the regeneration timing judgment means and an exhaust gas temperature is low; wherein the actuation of the exhaust gas temperature raising means is interrupted when the engine cooling water temperature detected by the cooling water temperature detection means exceeds a predetermined judgment water temperature, during the forced regeneration control of the filter using the exhaust gas temperature raising means.