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AssigneeSTT Emtec AB
InventorsIngemar Eriksson, Micael Blomquist
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The invention is related to a method and a device for recirculation of a part of exhaust gases from an exhaust pipe (6, 9) of a diesel engine (1) to the inlet of the engine, the exhaust gases being diverted from the exhaust pipe (6, 9) and directed through a recirculation conduit (10) to a controllable valve device (12) arranged between the engine and the air intake (2) thereof for allowing supply of air/recirculated exhaust gases in a desired relation to the combustion chamber of the engine (1). The invention also relates to a particular valve having two controllable inlets, said valve being useful in the method or device according to the invention, and a regulation method and device for regulating the air/fuel relation of a diesel engine.
A method for recirculating a part of exhaust gases from an exhaust pipe (6,9) of a diesel engine (1) to an inlet of the engine, the exhaust gases being diverted from the exhaust pipe (6,9) and directed through a recirculation conduit (10) to a controllable valve device (12) arranged between the engine and an air intake (2) thereof to enable supply of air/recirculated exhaust gases in a desired relation to a combustion chamber of the engine, the valve device comprising dampers (20,21) arranged in inlet channels (17,18) for the recirculated exhaust gases and air respectively, characterized in that at least one of the dampers (20,21) always is maintained open, the other damper (20,21) is closed by means of a drive motor (22) common to the dampers, and the drive motor (22) operates one of the dampers (20, 21) at a time and adjusts the same into any position between the open position and the closed position.
A device for recirculating a part of the exhaust gases from an exhaust pipe (6,9) of a diesel engine (1) to an inlet of the engine, a recirculation conduit (10) being provided for diverting the exhaust gases from the exhaust pipe (6,9) and directing them to a controllable valve device (12) arranged between the engine and an air intake (2) thereof for enabling supply of air/recirculated gases in a desired relation to a combustion chamber of the engine (1), the valve device comprising dampers (20,21) arranged in inlet channels (17,18) for the recirculated exhaust gases and air respectively, characterized in that the valve device is arranged to always maintain at least one of the dampers open, a drive motor (22) common to the dampers is arranged to close the other of the dampers (20,21) and the drive motor (22) is arranged to operate one of the dampers (20, 21) at a time and adjust the same into any position between the open position and the closed position.
A valve for mixing two fluids flowing through two inlet channels (17, 18), characterized in that dampers (20,21) are arranged in both inlet channels (17,18), at least one of the dampers always is open and that a common motor (22) is arranged to close the other of said dampers (20,21), and the motor (22) is arranged to operate one of the dampers (20, 21) at a time and adjust the same into any position between the open position and the closed position.
Dependencies are inferred from the claim text.