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US 8,601,811 B2Granted
Method and system adjusting an exhaust heat recovery valve
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Joseph Norman Ulrey
Life of this patent
Estimating the term…
Abstract
A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine.
Claims15
An engine method, comprising:
- determining turbocharger waste-gate degradation based on at least one of boost pressure, and a sensed position of a waste-gate;
- in response to the determined waste-gate degradation, increasing a level of exhaust heat extracted from combusted exhaust gas upstream of a turbocharger turbine and then flowing the combusted exhaust gas whose heat was extracted to the exhaust downstream of all cylinders and a turbocharger's turbine to reduce flow through the turbocharger's compressor.
An engine method, comprising:
- during a first condition, absent degraded operation of a turbocharger waste-gate, adjusting a position of a heat recovery valve in response to at least one of an engine speed, engine load, and boost pressure, the heat recovery valve providing a variable amount of exhaust gas heat to an exhaust heat recovery device, the variable amount of exhaust gas heat related to the position of the heat recovery valve;
- and
- during a second condition, including degradation of the turbocharger waste-gate, when an opening of the waste-gate is less than desired, increasing an opening of the heat recovery valve to limit flow through a turbocharger compressor.
Dependencies are inferred from the claim text.