| 摘要 |
<p>The exhaust gas successively flows through a hydrocarbon trap (3) and a catalytic converter (4) for the treatment of said gas, whereby the richness of the fuel in the mixture is regulated in a closed loop according to a predetermined set value by means of a signal delivered by an oxygen probe (5) placed in the exhaust line (2) between the engine (1) and the hydrocarbon trap (3). According to the invention, a) operation of the hydrocarbon trap (3) is detected by means of estimation by hydrocarbon release in the exhaust line (2) and b) during said operation, the richness of the set value for the regulation of the richness in a closed loop is reduced. In step a) the amount of fuel (MHC) contained in the trap is estimated and operation of the trap by hydrocarbon release is detected when said amount is positive and the temperature of the trap rises to beyond a set temperature (Ts).</p> |
