초록 ▼

A device for collecting and removing particulate emissions from diesel engine exhaust before the exhaust is discharged into the atmosphere. The device comprises an enclosure having an inlet, an outlet, a main flow path, containing a medium for trapping and removing particulate material, a by-pass fo

A device for collecting and removing particulate emissions from diesel engine exhaust before the exhaust is discharged into the atmosphere. The device comprises an enclosure having an inlet, an outlet, a main flow path, containing a medium for trapping and removing particulate material, a by-pass for diverting the exhaust flow around the main flow path, a heating unit to initiate forced regeneration of the medium and a control system for regulating the forced regeneration of the medium and the flow through the main and by-pass flow paths. In a first aspect of the invention the regeneration of the medium and the flow through the main and by-pass flow paths are regulated by a pair of valves, a thermocouple, engine sensors, and a back-pressure switch. In a second aspect of the invention, a single valve and microcomputer are used in place of the pair of valves and in conjunction with the thermocouple regulate the flow through the main and by-pass flow paths and the regeneration of medium. In a third aspect, a compact enclosure is provided for installations where space is limited. An optional pre-converter, electrostatic precipitator, air injection and thermal stabilizer are disclsoed for enhancing performance and increasing the filtration efficiency of the device over a broad range of diesel engine applications.

대표청구항 ▼

A diesel engine exhaust oxidizing device comprising an enclosure having an inlet for receiving diesel engine exhaust, a main flow path through said enclosure to an outlet of the enclosure, said main flow path containing a medium for trapping particulate material such as soot and removing significant

A diesel engine exhaust oxidizing device comprising an enclosure having an inlet for receiving diesel engine exhaust, a main flow path through said enclosure to an outlet of the enclosure, said main flow path containing a medium for trapping particulate material such as soot and removing significant amounts thereof from the exhaust flow through said main flow path, a by-pass through said enclosure for diverting flow from said main flow path and control means for selectively controlling the flow through said main flow path and said by-pass in accordance with certain sensed conditions relating to the status of engine operation and condition of the medium, said control means comprises a butterfly valve between said inlet and medium for opening and closing said main flow path to exhaust flow which enters the enclosure at said inlet, a by-pass valve for opening and closing said by-pass to exhaust flow which enters the enclosure at said inlet, biasing means for biasing said by-pass valve to normally close said by-pass to flow, a venturi disposed upstream of both the butterfly valve and the by-pass valve, said venturi and both said valves being organized and arranged such that when the main flow path is open to flow by said butterfly valve being open, there is established for back-pressure presented by the main flow path, a threshold above which the by-pass valve is caused to open the by-pass to flow, and said threshold corresponds to a back-pressure representing a level of particulate trapping by said medium at which regeneration of said medium is called for, said by-pass valve being disposed such that the back-pressure presented by the main flow path acts directly on the by-pass valve to cause the opening of said by-pass upon the back-pressure attaining the threshold.