公开(公告)号：US5050376A

公开(公告)日：1991-09-24

申请号：US477019

申请日：1990-02-08

申请人： Paul M. Stiglic ,  Brian C. Gabelman ,  James A. Hardy

发明人： Paul M. Stiglic ,  Brian C. Gabelman ,  James A. Hardy

IPC分类号： F01N3/02 ,  F01N3/023 ,  F01N9/00 ,  F02B3/06 ,  F02D9/04 ,  F02D41/02 ,  F02D41/14 ,  F02D41/38

CPC分类号： F02D41/1401 ,  F01N3/023 ,  F01N3/0235 ,  F01N9/002 ,  F02B37/025 ,  F02D41/029 ,  F02D41/1446 ,  F02D41/38 ,  F01N2240/36 ,  F01N2260/14 ,  F02B3/06 ,  F02D2041/0022 ,  F02D2041/1419 ,  F02D2250/18 ,  F02D2250/32 ,  F02D9/04 ,  Y02T10/144 ,  Y02T10/47

摘要： A control system for regenerating a particulate trap in the exhaust system of a diesel engine includes control logic which controls the air/fuel ratio of the engine by operating a backpressure valve in the engine exhaust system to provide a proper amount of excess oxygen to permit efficient combustion of the particulate content of the trap, but to avoid rapid and damaging combustion rates. Actual engine air/fuel ratio is compared to a commanded air/fuel ratio, and the position of the backpressure valve is adjusted accordingly. The commanded air/fuel ratio is ratcheted upwardly or downwardly once in a predetermined time period in response to a temperature error signal between exhaust gas temperature sensed in the engine exhaust manifold and a predetermined commanded temperature. An override is provided to permit the vehicle operator to override regeneration when power is required from the engine, and a low power cut-off is provided to suspend regeneration when the engine is operated for a period of time at low power conditions where regeneration is inefficient.

摘要翻译： 用于再生柴油发动机排气系统中的颗粒捕集器的控制系统包括控制逻辑，其通过操作发动机排气系统中的背压阀来控制发动机的空气/燃料比，以提供适量的过量氧气以允许有效 捕集器的颗粒物含量的燃烧，而避免了快速和破坏性的燃烧率。 将实际的发动机空燃比与指令的空燃比进行比较，并且相应地调节背压阀的位置。 响应于在发动机排气歧管中检测到的废气温度与预定指令温度之间的温度误差信号，在预定时间段内，命令空气/燃料比被向上或向下一次向上或向下棘轮。 提供超控以允许车辆操作者在从发动机需要动力时超驰再生，并且当发动机在再生效率低的低功率条件下在发动机运转一段时间时提供低功率切断以暂停再生 。