Methods and systems for torque control
AssigneeFord Global Technologies, LLC
InventorsAdam Nathan Banker, Julia Helen Buckland, Joseph Norman Ulrey, Uros Vojko Kalabic, Matthew John Gerhart, Tobias John Pallett, Ilya Kolmanovsky, Suzanne Kay Wait
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for improving surge control. When surge conditions are approached, a reference governor reduces engine airflow at a slower rate and to a higher level than the engine airflow required to meet the reduced torque demand. The excess torque resulting from the extra airflow is offset by applying a negative torque on the driveshaft via an electric machine coupled to the engine or via alternate engine actuator adjustments.
Claims24
A method for a boosted engine, comprising:
- via an electronic controller of the engine, responsive to an indication of turbocharger surge, applying negative torque from an electric machine coupled to the engine while providing an airflow to the engine greater than a demanded airflow, the demanded airflow determined based on an operator torque demand,
- wherein applying negative torque from the electric machine includes increasing a load applied on the engine from one or more of an alternator, an electric motor, and a starter-generator, and wherein providing the airflow greater than the demanded airflow includes providing a greater than demanded throttle flow to the engine.
A method for an engine, comprising:
- via an electronic controller of the engine:
- operating the engine at stoichiometry with an initial airflow amount based on a driver demanded torque;
- responsive to compressor surge, increasing airflow above the initial airflow amount while maintaining operation at stoichiometry;
- and
- absorbing excess engine torque resulting from the increasing airflow via an electric motor coupled to the engine.
A method for a boosted engine, comprising:
- via an electronic controller of the engine:
- during a first tip-out, reducing engine airflow at a first, faster rate to meet torque demand;
- and
- during a second, different tip-out, reducing engine airflow at a second, slower rate while applying an electric machine load on the engine to meet the torque demand.
A hybrid vehicle system, comprising:
- an engine for providing propulsion power;
- an electric motor for also providing propulsion power;
- a pedal for receiving an operator torque demand;
- a starter-generator for starting the engine;
- a compressor for providing a boosted aircharge to the engine;
- and
- a controller with computer readable instructions for:
- in response to an operator pedal tip-out,
- reducing engine airflow, the reducing limited based on a surge limit of the compressor;
- and
- increasing an electric machine load applied on the engine based on the limited reducing to meet the operator torque demand.
A method for a boosted engine, comprising:
- via an electronic controller of the engine:
- responsive to an indication of turbocharger surge,
- providing an airflow to the engine greater than a demanded airflow, the demanded airflow determined based on operator torque demand;
- and
- during a first condition, applying negative torque from an electric machine while providing the airflow;
- and
- during a second condition, adjusting an engine torque actuator while providing the airflow.
Dependencies are inferred from the claim text.