| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device having a downsized power supply device required for operating an ozone generation device. <P>SOLUTION: The ozone generation device 5 includes a first reactor 6 having a capacity large enough to generate ozone having a mole number in the same range as the mole number of NO in a range of not smaller than a reference exhaust amount and smaller than a maximum exhaust amount, a second reactor 7 having a capacity large enough to generate ozone having a mole number in the same range as the mole number of NO in a range of smaller than the maximum exhaust amount. When a NOx exhaust amount is not greater than the reference exhaust mount, the ozone is supplied only from the first reactor 6 to a NOx storage catalyst 3, and when the NOx exhaust amount is greater than the reference exhaust amount, the ozone is supplied from the first reactor 6 and the second reactor 7 to the NOx storage catalyst 3. When the NOx exhaust amount is not greater than the reference exhaust amount, an ECU 30 uses a change-over switch 17 for applying voltage alternately between electrodes 10, 11 of the first reactor 6 and between electrodes 12, 13 of the second reactor 7 to store the ozone in the second reactor 7. <P>COPYRIGHT: (C)2011,JPO&INPIT |
