| http://www.w3.org/ns/prov#value | - Accordingly, by virtue of the above temperature control devices, the temperature of the upstream-side NOx adsorbing and reducing catalyst can be controlled within a desired range.An example of the temperature lowering device is a device for injecting a cooling agent (such as water) into the exhaust gas passageway upstream of the upstream-side NOx adsorbing and reducing catalyst.
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