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发明公开
CN102667082A 内燃机的排气净化系统 失效 - 权利终止

内燃机的排气净化系统
摘要：
本发明提供一种内燃机的排气净化系统，该内燃机的排气净化系统在具有NSR催化剂和SCR的内燃机中，能够对由NOX的穿越导致的排放物恶化进行抑制。该排气净化系统为能够进行稀燃运转的内燃机（10）的排气净化系统，具有配置在排气通路（12）上的NSR催化剂（16）、配置在NSR催化剂（16）的下游的SCR（18）、配置在SCR（18）的下游并且产生与NOX浓度相应的输出的NOX传感器（26）、以及实施浓空燃比短时介入的浓空燃比短时介入单元，在NOX传感器（26）产生了比规定的NOX浓度高的输出特性的场合，使包含在浓空燃比短时介入时的废气中的NOX量增加。在为规定的高负荷运转的场合，最好将规定的时刻的浓空燃比短时介入时的空燃比控制为理论空燃比。另外，在为规定的低负荷运转的场合，使浓空燃比短时介入时的气体量增加。
摘要（英）：

Provided is an exhaust emission purification system for an internal combustion engine equipped with an NSR catalyst and an SCR wherein lowering of emission of NOx due to ventilation can be suppressed. An exhaust emission purification system of an internal combustion engine (10) capable of lean burn operation comprises an NSR catalyst (16) arranged in the exhaust passage (12), an SCR (18) arranged in the downstream of the NSR catalyst (16), an NOx sensor (26) arranged in the downstream of the SCR (18) and producing an output according to the concentration of NOx, and a rich spike means for carrying out rich spike, wherein the quantity of NOx contained in the exhaust emission at the time of rich spike is increased when the NOx sensor (26) exhibits the output characteristics which exceed a predetermined concentration of NOx. In case of predetermined heavy load operation, the air-fuel ratio is preferably controlled stoichiometrically at the time of rich spike of a predetermined timing. In case of predetermined light load operation, the amount of gas is increased at the time of rich spike.

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