| 摘要 |
PROBLEM TO BE SOLVED: To improve the responsiveness of a supercharging pressure rise. SOLUTION: If the temperature of an exhaust purifying catalyst is low and there is no acceleration request, exhaust bypassing a turbine of a turbosupercharger and maintaining high temperature is led to the catalyst to promote temperature raising activation (Step 1 to 4). In the process, if the catalyst is active or an acceleration request occurs, the exhaust bypassing of the turbine is prohibited, and if supercharging pressure is not higher than a given level, a postinjection is executed to elevate exhaust temperature and promote rises in turbine rotation and interlocked compressor rotation, which in turn suppresses lag in supercharging pressure rise. An excess air ratio corresponding to the postinjection quantity is controlled to suppress degradation in HC, CO and the like (Step 7 to 12). |
