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US 11,530,657 B2Granted
Compressor surge control
AssigneeCummins Inc.
InventorsMayura H. Halbe, Ming-Feng Hsieh
Life of this patent
Estimating the term…
Abstract
Systems, methods and apparatus are disclosed for providing or maintaining a target surge margin at the compressor during steady state engine operating conditions and to avoid compressor surge during transients by controlling a compressor recirculation valve position to a commanded position. The estimated surge margin can be determined in response to the measured pressure ratio across the compressor, an estimated compressor flow, and a compressor map for the compressor.
Claims20
A method, comprising:
- determining a target surge margin at a compressor of a turbocharger of an internal combustion engine, the internal combustion engine including a compressor recirculation valve including a first controllable actuator for controlling a position of the compressor recirculation valve, the turbocharger further including a turbine with a turbine bypass and a wastegate including a second controllable actuator for controlling a position of the wastegate in the turbine bypass;
- determining a compressor recirculation flow rate correction in response to the target surge margin and a throttle flow rate;
- determining a first compressor recirculation valve position command for the first controllable actuator based on a closed loop compressor outlet pressure compensation and an open loop compressor recirculation valve position determined to maintain the target surge margin in a steady state;
- determining a second compressor recirculation valve command for the first controllable actuator based on a compressor flow rate required to avoid surge at a measured compressor outlet pressure and a measured compressor flow rate;
- selecting one of the first and second compressor recirculation valve position commands;
- and
- positioning the compressor recirculation valve with the first controllable actuator in response to the selected one of the first and second compressor recirculation valve position commands.
4 more elements
An apparatus, comprising:
- an electronic controller configured to detect a compressor surge condition and, in response to the compressor surge condition:
- determine a first compressor recirculation valve position based on a closed loop compressor outlet pressure compensation and an open loop compressor recirculation valve position that maintains the target surge margin in a steady state;
- determine a second compressor recirculation valve position based on a compressor flow rate required to avoid surge at a measured compressor outlet pressure and a measured compressor flow rate;
- determine, in response to a selected one of the first and second compressor recirculation valve positions, a compressor recirculation valve position command that controls a compressor recirculation valve actuator to position a compressor recirculation valve in a compressor recirculation flow path of an internal combustion engine, the electronic controller further being configured to determine a wastegate actuator position command that controls a wastegate actuator to position a wastegate in a turbine bypass of the internal combustion engine.
1 more element
A system, comprising:
- an internal combustion engine pneumatically coupled to a compressor of a turbocharger on an inlet side of the engine and to a turbine of the turbocharger on an outlet side of the engine, the compressor including a compressor recirculation flow path and a compressor recirculation valve in the compressor recirculation flow path connected to a compressor recirculation valve actuator responsive to a compressor recirculation valve actuator command, the turbine comprising a wastegate connected to a wastegate actuator responsive to a wastegate actuator position command;
- and
- a controller configured to detect a compressor surge condition and, in response to the compressor surge condition:
- determine a first compressor recirculation valve position based on a closed loop compressor outlet pressure compensation and an open loop compressor recirculation valve position that maintains the target surge margin in a steady state, determine a second compressor recirculation valve position based on a compressor flow rate required to avoid surge at a measured compressor outlet pressure and a measured compressor flow rate;
- and
- select one of the first compressor recirculation valve position and the second compressor recirculation valve position,
- wherein the compressor recirculation valve is moved to the selected position in response to a command from the controller.
4 more elements
Dependencies are inferred from the claim text.