| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely protect a reducer injection valve from exhaust heat when urea water having cooling action is not sufficiently supplied to the reducer injection valve in an exhaust emission control device including a filter trapping exhaust particulate matter contained in exhaust gas of an engine, the reducer injection valve injecting urea water as NOx reducer into exhaust gas for removing NOx in exhaust gas, a reducer supply device supplying urea water to the injection valve, and ECU controlling operation of the injection valve, the supply device and the engine, and regenerates the filter by fuel injection control from the injector by ECU. <P>SOLUTION: When the EUC determines that urea water supply pressure Pr to the reducer injection valve is not higher than a prescribed pressure (Yes determination in step SA2), and when the ECU determines that remaining quantity Mr of urea water is less than a prescribed quantity even if the pressure exceeds the prescribed pressure (Yes determination in step SA3), target filter temperature during filter regeneration is set lower. <P>COPYRIGHT: (C)2010,JPO&INPIT |
