Method for operating a turbocharger arrangement and control unit for a turbocharger arrangement
AssigneeFord Global Technologies, LLC
InventorsSimon Petrovic, Alain Marie Roger Chevalier, Arno Bartsch
Life of this patent
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Abstract
A method for operating a turbocharger arrangement of an internal combustion engine, the turbocharger arrangement comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the high-pressure turbocharging stage comprising a high-pressure compressor with a sensorless compressor bypass valve, comprises evaluating at least one sensor signal of the turbocharger arrangement for detecting a failure mode of the compressor bypass valve.
Claims15
A method for operating a turbocharged engine via an electronic control unit including non-transitory instructions stored in memory, the turbocharged engine comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the high-pressure turbocharging stage comprising a high-pressure compressor with a passive, sensorless compressor bypass valve to bypass the high-pressure compressor, the method comprising:
- detecting a failure mode of the compressor bypass valve based on at least one sensor signal of the turbocharged engine, the at least one sensor signal including a signal from an inter-stage pressure sensor located upstream from a high-pressure compressor bypass line outlet and downstream from a low-pressure compressor inlet;
- and
- when the failure mode is detected, setting a first turbine bypass valve to a designated position and controlling boost pressure with a second turbine bypass valve.
A method of controlling a turbocharged engine via an electronic control unit including non-transitory instructions stored in memory, comprising:
- operating the turbocharged engine with a low-pressure turbocharger and a high-pressure turbocharger arranged sequentially, the high-pressure turbocharger comprising a compressor with a passive, sensorless compressor bypass valve (CBV);
- determining degradation of the CBV based on an operating parameter;
- and
- adjusting a turbine bypass valve in response to the determination of the degradation of the CBV.
A method of controlling a turbocharged engine via an electronic control unit including non-transitory instructions stored in memory, comprising:
- operating the turbocharged engine with sequentially arranged low-pressure and high-pressure turbochargers including a high-pressure compressor with a passive, sensorless compressor bypass valve (CBV);
- setting a high-pressure turbine bypass valve fully open and controlling boost pressure by a low-pressure turbine bypass valve responsive to CBV degradation at low-speed/torque;
- and
- setting the low-pressure turbine bypass valve fully closed and controlling boost pressure by the high-pressure turbine bypass valve responsive to CBV degradation at high-speed/torque.
Dependencies are inferred from the claim text.