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US 9,850,831 B2Granted
Method and system for engine speed control
AssigneeFord Global Technologies, LLC
InventorsHamid-Reza Ossareh, Adam Nathan Banker, Baitao Xiao
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for engine speed flare control in an engine system having multiple staged charge boosting devices. In one example, during an engine start, an upstream compressor is rotated backwards via an electric motor to reduce the intake manifold pressure. The engine is then fueled based on the lower manifold pressure to reduce torque and engine speed flare until idle engine speed conditions are reached.
Claims17
A method for an engine, comprising:
- during an engine run-up to idle speed:
- spinning a first compressor with a motor opposite a normal direction to lower intake manifold pressure, wherein a speed of the first compressor spinning is based on engine speed, the first compressor being driven by an electric motor;
- while
- not spinning a second compressor located downstream of the first compressor, the second compressor driven by an exhaust turbine via a shaft.
1 more element
A method for a boosted engine, comprising:
- during an engine start,
- before engine speed reaches idling speed, spinning a first compressor opposite a normal direction with a second compressor deactivated;
- and
- in response to the engine speed reaching idling speed, spinning the first compressor forward with the second compressor maintained deactivated,
- wherein the first compressor is a supercharger compressor driven by an electric motor, and wherein the second compressor is a turbocharger compressor driven by an exhaust turbine via a shaft located downstream of the first compressor.
2 more elements
An engine system, comprising:
- an engine having an intake manifold;
- an intake throttle;
- a pedal for receiving an operator torque demand;
- a fuel injector coupled to an engine cylinder;
- a first intake compressor driven by an electric motor, the motor powered by a battery;
- a reversing circuit selectively couplable to the electric motor;
- a second intake compressor driven by an exhaust turbine, the first compressor positioned upstream of the first compressor along an intake passage;
- a pressure sensor coupled to the intake manifold;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- determining estimated manifold pressure;
- and
- in response to an engine restart request,
- rotating the first compressor opposite a normal direction via the motor to generate intake manifold vacuum;
- and
- during the rotating the first compressor the opposite the normal direction, fueling the engine cylinder based on the estimated manifold pressure until an engine speed reaches a threshold speed.
13 more elements
Dependencies are inferred from the claim text.