초록 ▼

A method and apparatus to reduce the emissions of an exhaust stream is provided. One feature of the present invention includes a control unit for metering a reagent into the exhaust stream. The control unit adjusts a quantity of the reagent to be metered into the exhaust stream. One embodiment of th

A method and apparatus to reduce the emissions of an exhaust stream is provided. One feature of the present invention includes a control unit for metering a reagent into the exhaust stream. The control unit adjusts a quantity of the reagent to be metered into the exhaust stream. One embodiment of the present invention concerns a method of removing nitrogen oxides in exhaust gases from a diesel engine by introducing ammonia into the exhaust stream. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

대표청구항 ▼

What is claimed is: 1. An emission control apparatus for an engine including a catalytic converter, comprising: an ammonia injector for injecting a continuous and variable amount of ammonia into an exhaust stream of the engine to reduce NOx emissions; a controller structured to control the ammonia

What is claimed is: 1. An emission control apparatus for an engine including a catalytic converter, comprising: an ammonia injector for injecting a continuous and variable amount of ammonia into an exhaust stream of the engine to reduce NOx emissions; a controller structured to control the ammonia injector; a first exhaust gas temperature sensor disposed adjacent to the engine; a second exhaust temperature sensor disposed adjacent to the catalytic converter; and a catalyst; wherein the controller is adapted to precisely control the continuous and variable amount of ammonia injected into the exhaust stream to reduce an amount of ammonia slippage; wherein data detected by the first exhaust gas temperature sensor is used to anticipate the amount of NOx produced by the engine; wherein data detected by the second exhaust temperature sensor is used to adjust the amount of ammonia injected into the exhaust stream; further comprising an intake air sensor, a throttle position sensor, an engine revolutions-per-minute sensor, an exhaust backpressure sensor, an ammonia tank sensor, an intake air temperature sensor, a turbocharger boost sensor, a crankshaft sensor, an ammonia temperature sensor, an ammonia container temperature sensor, and an ammonia container pressure sensor. 2. The apparatus of claim 1, wherein the engine is selected from a group consisting of an engine using gasoline, an engine using diesel fuel, an engine using natural gas, a spark-ignition engine, and a compression-ignition engine. 3. The apparatus of claim 1, wherein the catalyst is a selective catalytic reduction converter. 4. The apparatus of claim 1, wherein the ammonia is selected from a group consisting of, ammonia in a gas state, urea, and ammonia mixed with a liquid. 5. The apparatus of claim 1, wherein the controller is structured to control an ammonia shut-off valve. 6. The apparatus of claim 1, wherein the controller is structured to control a diagnostic light that presents diagnostic codes by turning on and off. 7. The apparatus of claim 1, further comprising an ammonia container pressure regulator, an ammonia container heater, a catalyzed diesel particulate trap, an air pump, a liquid pump, a heater, and a mixer element. 8. A method of reducing an amount of oxides of nitrogen contained in a gas stream from an engine, the method comprising the steps of: providing a controller that communicates with a plurality of sensors that provide information to the controller, including a first exhaust gas temperature sensor disposed adjacent to the engine and a second exhaust temperature sensor disposed downstream of the first exhaust gas temperature sensor; using data detected by the first exhaust gas temperature sensor to anticipate the amount of NOx produced by the engine; using data detected by the second exhaust temperature sensor to adjust the amount of ammonia injected into the exhaust stream; and precisely controlling a continuous and variable amount of ammonia injected into the exhaust stream to reduce an amount of ammonia slippage; further comprising the steps of regulating the amount of ammonia that is introduced into the gas stream by analyzing information from an intake air sensor; regulating the amount of ammonia that is introduced into the gas stream by analyzing information from a throttle position sensor; regulating the amount of ammonia that is introduced into the gas stream by analyzing information from an engine revolutions-per-minute sensor; regulating the amount of ammonia that is introduced into the gas stream by analyzing information from an exhaust backpressure sensor; regulating the amount of ammonia that is introduced into the gas stream by analyzing information from an intake air temperature sensor; regulating the amount of ammonia that is introduced into the gas stream by analyzing information from a turbocharger boost sensor; and regulating the amount of ammonia that is introduced into the gas stream by analyzing information from a crankshaft sensor. 9. The apparatus of claim 8, wherein the engine is selected from a group consisting of: an engine using gasoline, an engine using diesel fuel, an engine using natural gas, a spark-ignition engine, and a compression-ignition engine. 10. The apparatus of claim 8, further including ammonia that is injected by the ammonia injector, wherein the ammonia is selected from a group consisting of, ammonia in a gas state, urea, and ammonia mixed with a liquid. 11. An emission control apparatus for an engine producing a gas stream, comprising: a pre-oxidation catalyst located downstream of the engine, and structured to receive the gas stream; an ammonia injector located substantially in the gas stream, and located downstream of the pre-oxidation catalyst; a controller structured to control the ammonia injector; a first exhaust gas temperature sensor disposed adjacent to the engine; a second exhaust temperature sensor disposed downstream of the first exhaust gas temperature sensor; a mixer element located substantially in the gas stream, and located downstream of the ammonia injector; and an SCR catalyst located downstream of the a mixer element, and structured to receive the gas stream; wherein the controller is adapted to precisely control a continuous and variable amount of ammonia injected into the exhaust stream to reduce an amount of ammonia slippage; further comprising an intake air sensor, a throttle position sensor, an engine revolutions-per-minute sensor, an exhaust backpressure sensor, an ammonia tank sensor, an intake air temperature sensor, a turbocharger boost sensor, a crankshaft sensor, an ammonia temperature sensor, an ammonia container temperature sensor, and an ammonia container pressure sensor. 12. The apparatus of claim 11, wherein the controller is structured to control an ammonia shut-off valve. 13. The apparatus of claim 11, wherein the controller is structured to control a diagnostic light that presents diagnostic codes by turning on and off. 14. The apparatus of claim 11, further comprising an ammonia container pressure regulator, an ammonia container heater, a pre-catalytic converter, a selective catalytic reduction converter, an ammonia slip converter, a catalyzed diesel particulate trap, an air pump, a liquid pump, and a heater.