Turbocharger shaft over-speed compensation
AssigneeFord Global Technologies, LLC
InventorsYong Shu, Michiel J. Vvan Nieuwstadt
Life of this patent
Estimating the term…
Abstract
A method for controlling engine operation, the engine having a turbocharger coupled between an intake and exhaust manifold of the engine via a turbocharger shaft, the method comprising dynamically determining turbocharger shaft speed based at least on intake and exhaust manifold conditions using a torque balance across the turbocharger; and adjusting turbocharger boosting to adjust turbocharger shaft speed in response to said dynamically determined turbocharger shaft speed.
Claims15
A method for controlling an engine having a turbocharger coupled between an intake and exhaust manifold of the engine via a turbocharger shaft, comprising:
- dynamically determining turbocharger shaft speed based at least on intake and exhaust manifold conditions using a torque balance across the turbocharger;
- and
- adjusting turbocharger boosting to limit turbocharger shaft speed to be below a threshold value in response to said dynamically determined turbocharger shaft speed, even during transient turbocharger conditions.
A method for controlling engine operation, the engine having a turbocharger coupled between an intake and exhaust manifold of the engine via a turbocharger shaft, the method comprising:
- dynamically estimating turbocharger shaft speed based on intake and exhaust flow and turbocharger inertia using a torque balance across the turbocharger, said dynamic estimate including feedback based on steady state turbocharger mapping data, said feedback including an integrated term;
- adjusting said integrated term based on a change in steady state turbocharger operation using steady state mapping data;
- and
- adjusting turbocharger boosting to limit turbocharger shaft speed in response to said dynamically estimated turbocharger shaft speed.
A system comprising:
- a diesel engine;
- a variable geometry turbocharger having a turbocharger shaft coupled between an intake and exhaust of the diesel engine;
- a controller for dynamically determining turbocharger shaft speed based at least on intake and exhaust manifold conditions using a torque balance across the turbocharger and adjusting turbocharger boosting via vane position to limit turbocharger shaft speed in response to said dynamically determined turbocharger shaft speed, the controller accounting for altitude effects on dynamic and steady state turbocharger operation, the controller determining manifold pressure, exhaust pressure, and atmospheric pressure to dynamically determine turbocharger shaft speed, and the controller further including an integral action to reduce steady state error.
Dependencies are inferred from the claim text.