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US 10,502,122 B2Granted
Method and system for boost pressure control
AssigneeFord Global Technologies, LLC
InventorsBaitao Xiao, Hamid-Reza Ossareh, Adam Nathan Banker
Life of this patent
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Abstract
Methods and systems are provided for controlling boost pressure in a staged engine system comprising a turbocharger and an upstream electric supercharger. In one example, a method may include accelerating an electric supercharger to choke the flow of air to the engine in the event of turbocharger overboost.
Claims20
A method for operating a vehicle system, comprising:
- bypassing a first, upstream compressor and providing a flow of compressed air to a direct injection piston engine via a second, downstream compressor, at least one of the compressors driven by an electric motor electrically coupled with a battery;
- in response to a boost pressure overshoot, adjusting speed of the first compressor;
- and
- in response to an indication of degradation of a compressor bypass valve, adjusting an actuator with a default tuning.
1 more element
A method for a boosted engine, comprising:
- responsive to a first increase in driver demand, accelerating a first, upstream compressor to increase airflow through a second, downstream compressor;
- responsive to a second increase in driver demand, adjusting speed of the first, upstream compressor to decrease airflow through the second, downstream compressor;
- and
- adjusting operation of the first compressor based on an altitude of vehicle operation of a vehicle in which the boosted engine is positioned.
1 more element
An engine system, comprising:
- a direct injection engine having an intake;
- a first intake compressor driven by an electric motor, the motor powered by a battery;
- a second intake compressor driven by an exhaust turbine, the second compressor positioned downstream of the first compressor along the intake;
- a bypass including a bypass valve coupled across the first compressor;
- a wastegate including a wastegate valve coupled across the exhaust turbine;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- in response to an operator pedal tip-in while the second compressor is spinning,
- closing the wastegate valve to adjust a speed of the second compressor;
- and
- concurrently adjusting a speed of the first compressor to limit airflow into the second compressor, wherein operation of the first compressor is further adjusted based on an altitude of operation of the engine system.
8 more elements
Dependencies are inferred from the claim text.