A method and system for preventing oil escape
AssigneeVolvo Truck Corporation
InventorMagnus EKSTRAND
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Abstract
A method is provided for preventing oil escape into an exhaust gas during operation of a turbocharged engine. The method includes providing pressurized fluid to an area sealing off a bearing housing of an axial turbine unit from an adjacent exhaust conduit downstream of the axial turbine unit, and detecting a malfunction in the provision of pressurized fluid. Further to this, the method includes the step of, in response to such malfunction detection, controlling an exhaust pressure increasing device arranged downstream of the axial turbine unit for increasing the pressure inside the exhaust conduit upstream of the exhaust pressure increasing device.
Claims22
A method for preventing oil escape into an exhaust gas during operation of a turbocharged engine, comprising:
- providing pressurized air to an area sealing off a bearing housing of an axial turbine unit from an adjacent exhaust conduit downstream of the axial turbine unit;
- and
- detecting a malfunction in the provision of pressurized air;
- in response to such malfunction detection, controlling an exhaust pressure increasing device arranged downstream of the axial turbine unit for increasing the pressure inside the exhaust conduit upstream of the exhaust pressure increasing device.
A vehicle system, comprising an exhaust pressure increasing device and an axial turbine unit arranged upstream of the exhaust pressure increasing device, the axial turbine unit comprising an air supply for providing pressurized air to an area sealing off a bearing housing of the axial turbine unit from an adjacent exhaust conduit, wherein the vehicle system further comprises a control unit configured to monitor the operation of the air supply, wherein the control unit is further configured to control the operation of the exhaust pressure increasing device in response to a detected malfunction in the provision of pressurized air.
Dependencies are inferred from the claim text.