Digital waste gate valve arrangement and method of operating a digital waste gate valve arrangement in an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016003136-A1
Application number	US-201314772279-A
Country	US
Kind code	A1
Filing date	Mar 5, 2013
Priority date	Mar 5, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A digital waste gate arrangement in an internal combustion piston engine has at least one turbocharger with a compressor part and a turbine part. A flow control unit has more than two individually controllable on-off valve units, and a pneumatic actuator system is arranged to control each on-off valve individually. At least one control gas inlet port is in connection with the pneumatic actuator system, which control gas inlet port is arranged in connection with a downstream side of a compressor part of the turbocharger via a control gas passage. The control gas for operating the flow control unit is arranged available for the pneumatic actuator sys-tem through the control gas passage.

First claim

1 . A digital waste gate valve arrangement ( 100 ) in an internal combustion piston engine ( 12 ) having at least one turbocharger ( 14 ) with a compressor part ( 16 ) and a turbine part ( 18 ), and which digital waste gate arrangement comprises a flow control unit ( 106 ) having more than two individually controllable on-off valve units, and which arrangement comprises pneumatic actuator system ( 102 ) arranged to control each on-off valve unit individually, characterized in that the arrangement ( 100 ) comprises at least one control gas inlet port ( 108 ) in connection with the pneumatic actuator system ( 102 ), which control gas inlet port is arranged in connection with a downstream side of a compressor part ( 16 ) of the turbocharger via a control gas passage ( 22 , 22 ′) and that the control gas for operating the flow control unit ( 106 ) is arranged available for the pneumatic actuator system ( 102 ) through said control gas passage ( 22 , 22 ′).

2 . A digital waste gate valve arrangement ( 100 ) according to claim 1 , characterized in that the pneumatic actuator system ( 102 ) of the arrangement ( 100 ) comprises a dedicated pneumatic actuator ( 102 . 1 - 102 .N) arranged for each valve unit ( 106 . 1 - 106 .N) of the digital waste gate arrangement ( 100 ) and that each of the pneumatic actuators is in in connection with an inlet air passage ( 30 ) at downstream side of a compressor part ( 16 ).

3 . A digital waste gate valve arrangement ( 100 ) according to claim 1 , characterized in that pneumatic actuator system ( 102 ) of the arrangement ( 100 ) comprises a control system ( 104 . 1 - 104 .N) arranged for each pneumatic actuator ( 102 . 1 - 102 .N), and each control system ( 104 . 1 - 104 .N) is provided with at least two control ports ( 120 , 122 ) and an inlet port ( 124 ) for each pneumatic actuator ( 102 .N), and the control system ( 104 .N) is arranged for setting selectable flow connections between the at least one inlet port ( 124 ) and the control ports ( 120 , 122 ).

4 . A digital waste gate valve arrangement ( 100 ) according to claim 1 , characterized in that the control system ( 104 .N) comprises a control gas discharge port ( 110 ) for discharging the used control gas.

5 . A digital waste gate valve arrangement ( 100 ) according to claim 1 , characterized in that the control discharge port is provided with a check valve ( 112 .N).

6 . A digital waste gate valve arrangement ( 100 ) according to claim 5 , characterized in that the check valve ( 112 .N) is arranged to have an opening threshold pressure.

7 . A digital waste gate valve arrangement ( 100 ) according to claim 4 , characterized in that the control gas discharge port ( 110 .N) is arranged to be controllably set by the control system ( 104 .N) in a selectable flow connection to one of the control ports ( 120 , 122 ) of said two control ports.

8 . A digital waste gate valve arrangement ( 100 ) according to claim 1 , characterized in that the pneumatic actuator ( 102 .N) is a piston actuator which comprises a spring ( 126 ) arranged to urge the piston towards its valve unit closing direction.

9 . Method of operating a digital waste gate valve arrangement ( 100 ) in an internal combustion piston engine ( 12 ) having at least one turbocharger ( 14 ) with a compressor part ( 16 ) and a turbine part ( 18 ), in the turbine part ( 18 ) of the turbocharger unit ( 14 ) energy of the exhaust gas is partially used for driving the compressor part ( 16 ) and the operation of the turbine part ( 18 ) is controlled by a digital waste gate arrangement controlled by a pneumatic actuator system ( 102 ), characterized in that while the engine is operated, charge air is pressurized by the compressor part ( 16 ), the pressurized charge air is used as a control gas operating the pneumatic actuator system ( 102 ) of the digital waste gate arrangement ( 100 ).

Assignees

• Waertsilae Finland Oy

Inventors

• Mäenpää Janne

Classifications

• F02B37/186 Primary

  Arrangements of actuators or linkage for bypass valves · CPC title

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title