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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKimimichi Tokuda, Kouichi Watanabe, Junichi Onoue
Estimating the term…
Apparatus for purifying exhaust gas from a diesel engine includes a wall-flow filter made of a porous ceramic material for capturing carbon components contained in the exhaust gas and burning up the captured carbon components, a first exhaust pipe for introducing the exhaust gas into the filter, a second exhaust pipe for introducing the exhaust gas purified by the filter a bypass pipe bypassing the filter, first and second valves arranged inside of the first and bypass pipes, respectively, for controlling the exhaust gas flow, a heater for burning up carbon components captured in the filter, first and second temperature sensors for detecting temperatures in the first pipe and the filter, respectively, and a controller for controlling opening and closing of the first and second valves based on the temperature difference between temperatures detected by first and second temperature sensors to prevent the filter from cracking.
An apparatus for purifying exhaust gas comprising a filter made of a ceramic material that traps and captures carbon components in the exhaust gas from a diesel engine and burns up the captured carbon components after a certain amount of said carbon components is deposited to activate said filter itself, a first pipe that leads the exhaust gas from the engine into said filter, a second pipe that leads the exhaust gas purified by said filter into a muffler, a by-pass pipe that branches off from said first pipe and is connected to said second pipe to by-pass the exhaust gas from said first pipe into said second pipe, a first valve that is installed inside said first pipe and controls the flow of exhaust gas into said filter, a second valve that is installed inside said by-pass pipe and controls the flow of exhaust gas in said by-pass pipe, a first temperature detector that detects the temperature of exhaust gas in said first pipe, a second temperature detector that detects the temperature of said filter, a heating means that heats up said filter, and a controller that controls said heating system, said first valve, and said second valve based on the outputs of said first temperature detector, said second temperature detector, and the engine, said controller controlling the opening and closing of said first valve and said second valve based on the temperature difference between the temperature detected by said first temperature detector and the temperature detected by said second temperature detector in such a way as said controller closes said first valve and opens said second value, if said temperature difference exceeds a selected value.
An apparatus for purifying exhaust gas comprising a filter made of a ceramic material that impacts and absorbs carbon components in the exhaust gas from an engine and burns up the adhering carbon components after a certain amount of said carbon components is deposited to activate said filter itself, a first pipe that leads the exhaust gas from the engine into said filter, a second pipe that leads the exhaust gas purified by said filter into a muffler, a by-pass pipe that branches off from said first pipe and is connected to said second pipe to by-pass the exhaust gas from said first pipe into said second pipe, a first valve that is installed inside said first pipe and controls the flow of exhaust gas into said filter, a second valve that is installed inside said by-pass pipe and controls the flow of exhaust gas in said by-pass pipe, a heating means that heats up said filter, and a controller that controls said heating system, said first valve, and said second valve based on the output of the engine, said controller controlling the opening and closing of said first valve and said second valve based on the lapse of time after the starting of the engine in such a way as said controller closes said first valve and opens said second valve, when the engine is started.
Dependencies are inferred from the claim text.