| 摘要 |
<p>PURPOSE: To provide an exhaust emission control device by which the early activation of a catalyst and the overheating thereof can be prevented. CONSTITUTION: An exhaust emission control device is provided with a first catalytic converter 11 of a small heat capacity, a second catalytic converter 12 of a large capacity that has been arranged downstream of the first catalytic converter 11, a secondary air supplying means 13 for supplying secondary air to the ustream of the first catalytic converter 11 or to an intermediate part between both the catalytic converters 11, 12, and a fuel injection quantity increasing means 14. A control means 30 supplies the secondary air to the upstream of the first catalytic converter 11 when the first catalytic converter 11 is in a partially activated condition, on the basis of the outputs of an operation state detecting means 22 and a temperature judging means 21; while when overheating would be caused, the secondary air is supplied to the intermediate part between both the catalytic converters 11, 12 for increasing a quantity of fuel injection.</p> |
