Methods and systems for boost control
AssigneeFord Global Technologies, LLC
InventorsArturo del Refugio Sanchez Perez, Daniel Andres Ramos Coria, Rodrigo Felix, Artemio Magana
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for adjusting operation of an electric motor coupled to a compressor at high altitude engine operation. In one example, the method may include adjusting a ratio of electric compressor assist provided by an electric motor to an intake compressor relative to turbine assist provided via a wastegate during engine idling conditions as well as during transmission gearshifts. The method allows for engine idle speed and torque to be maintained at high altitudes while reducing sluggish boost behavior.
Claims18
A method for a boosted engine, comprising:
- adjusting a ratio of turbocharger compressor assist provided from an electric motor relative to turbocharger compressor assist provided from an exhaust wastegate based on ambient altitude during engine idling conditions preceding an operator pedal tip-in event, wherein the ratio is further adjusted based on a state of charge of a system battery, the compressor assist provided from the electric motor increased as the state of charge of the system battery exceeds a threshold.
A method for a boosted engine, comprising:
- adjusting a ratio of turbocharger compressor assist provided from an electric motor relative to turbocharger compressor assist provided from an exhaust wastegate based on ambient altitude during engine idling conditions preceding an operator pedal tip-in event;
- and, in response to the operator pedal tip-in event, further increasing the compressor assist provided from the electric motor while decreasing the compressor assist provided from the exhaust wastegate.
A method for a boosted engine, comprising:
- adjusting a ratio of turbocharger compressor assist provided from an electric motor relative to turbocharger compressor assist provided from an exhaust wastegate based on ambient altitude during engine idling conditions preceding an operator pedal tip-in event;
- and, in response to a transmission gear upshift/downshift while operating at a higher than threshold ambient altitude, increasing the ratio of compressor assist from the electric motor until the upshift/downshift is completed, and then increasing the ratio of compressor assist from the wastegate.
A method for a hybrid vehicle having a turbocharged engine, comprising:
- during a transmission gear shift, adjusting an amount of motor assist provided to a turbocharger compressor from an electric motor based on vehicle altitude, and further based on the transmission gear shift;
- and
- not providing motor assist to the compressor during the transmission gear shift when the vehicle altitude is below a threshold.
A vehicle system, comprising:
- an engine;
- an electric motor coupled to a battery;
- vehicle wheels driven by one or more of the engine and the electric motor;
- a transmission coupled between the engine and the vehicle wheels;
- a turbocharger for providing boosted intake air to the engine, the turbocharger including a compressor driven by a turbine, the compressor also configured to receive electric compressor assist from the electric motor;
- an exhaust wastegate selectively bypassing the turbine in an exhaust passage;
- a navigational system;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- receiving input regarding an altitude of vehicle operation from the navigational system;
- and
- when the altitude is higher than a threshold,
- operating the electric motor during engine idling conditions, before an operator tip-in request is received, to maintain engine idling speed by providing electric compressor assist to the compressor, an amount of electric compressor assist provided to the compressor based on a difference of the altitude from the threshold;
- and
- concurrently decreasing an opening of the wastegate, the decreasing of the opening of the wastegate based on the amount of electric compressor assist provided to the compressor.
Dependencies are inferred from the claim text.