Patent ID: 6871489

Claim:
An exhaust emissions reduction system for diesel engines, the diesel engine producing an exhaust stream containing particulate matter and emissions, the exhaust emissions reduction system comprising: an emissions oxidation device; a heat exchanger downstream from said emissions oxidation device, said heat exchanger adapted to change a temperature of the exhaust stream; a selective catalytic reduction device adapted to chemically alter emissions in the temperature adjusted exhaust stream, said selective catalytic reduction device placed downstream from said heat exchanger; a filter to remove particulate matter from the exhaust stream; heater placed downstream from said selective catalytic reduction device and upstream from said filter for regenerating said filter; at least one sensor disposed in the exhaust stream and sensing the temperature of the exhaust stream; and a controller coupled to said heat exchanger and said heater, said controller adapted to control operations of said heat exchanger and said heater based upon the temperature sensed by said sensor.