| abstract |
PROBLEM TO BE SOLVED: To provide an exhaust purification device that efficiently burns and removes collected PM of a continuously regenerating diesel particulate filter. SOLUTION: A DOC (oxidation catalyst) 26 that causes unburned components in exhaust gas to be burned by catalytic action is interposed in an exhaust passage 15 of the engine, and a DPF that collects PM in exhaust gas downstream of the DOC 26 ( In the exhaust gas purification apparatus having a temperature raising means for forcibly regenerating the DPF 25 that increases the unburned components led to the DOC, the secondary air is supplied to the upstream side of the DOC 26 in the exhaust passage 15. A secondary air supply means 40, a heater 46 for heating the secondary air, and a secondary air supply means so as to obtain the supply amount of secondary air and the temperature of the secondary air calculated according to the operating state of the engine; And a controller 20 for controlling the operation of the heater. [Selection] Figure 1 |