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    • 62. 发明授权
    • Apparatus and method for vehicle emissions control
    • 车辆排放控制装置和方法
    • US06568179B2
    • 2003-05-27
    • US09797236
    • 2001-03-01
    • Michel Deeba
    • Michel Deeba
    • F01N300
    • F01N3/2046F01N3/0814F01N3/0842F01N3/0885F01N3/101F01N13/009F01N13/0093F01N2410/00F01N2570/04Y02A50/2324Y02T10/22Y02T10/24Y02T10/26
    • An apparatus and method for vehicle emissions control are disclosed. More particularly, an apparatus and method for insuring that the temperature of a vehicle's exhaust gas stream entering the underfloor catalytic converter during engine operation does not exceed the temperature at which the capability of the multi-functional catalyst in the converter to absorb NOx starts to fall off. A first temperature sensor is provided in the exhaust outlet leading from the exhaust manifold of the engine and a second temperature sensor is provided in the catalytic converter. The catalytic converter contains a multi-functional catalyst such as a three-way conversion catalyst and a NOx trap as well as a NOx sensor at its outlet for sensing when NOx breakthrough is occurring. The sensors transmit their readings to a controller which transmits signal to a proportional valve located in the exhaust outlet downstream of the first temperature sensor. In response to the signals received from the controller, the proportional valve divides the exhaust gas stream received from the engine exhaust manifold into a first stream in communication with the catalytic converter and a second stream in communication with a heat exchanger. Any stream exiting the heat exchanger is then blended with the non-heat exchanged stream and the blended stream is passed into the catalytic converter. The amount of the exhaust gas stream in the first conduit will vary from that in the second conduit such that the temperature entering the catalytic converter is maintained in the range of about 300 to about 600° C. during the lean mode operation of the engine and further such that the multi-functional catalyst is periodically purged of NOx and/or SOx.
    • 公开了一种用于车辆排放控制的装置和方法。 更具体地,涉及一种用于确保在发动机运转期间进入地板下催化转化器的车辆的废气流的温度不超过转化器中的多功能催化剂吸收NOx的能力开始下降的温度的装置和方法 关闭 第一温度传感器设置在从发动机的排气歧管引出的排气出口中,并且第二温度传感器设置在催化转化器中。 催化转化器包含多功能催化剂,例如三元转化催化剂和NOx捕集器,以及在其出口处的NOx传感器,用于在发生NOx突破时感测。 传感器将其读数传送到控制器,该控制器将信号传输到位于第一温度传感器下游的排气出口中的比例阀。 响应于从控制器接收的信号,比例阀将从发动机排气歧管接收的废气流分成与催化转化器连通的第一流和与热交换器连通的第二流。 然后将离开热交换器的任何物流与未热交换的流混合,并将混合的物流进入催化转化器。 第一导管中的废气流的量将与第二导管中的排气流量不同,使得在发动机的稀薄模式运行期间进入催化转化器的温度保持在约300至约600℃的范围内, 进一步使得多功能催化剂周期性地清除NOx和/或SOx。