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US 8,412,442 B2Granted
Method of engine starting
AssigneeFord Global Technologies, LLC
InventorEric Kurtz
Life of this patent
Estimating the term…
Abstract
An engine starting method is disclosed. In one example, engine operation is adjusted to reduce catalyst light off time. Exhaust temperatures may be increased until a threshold engine temperature is reached.
Claims17
A method, comprising:
- operating an engine at idle conditions with a first EGR percent concentration of cylinder charge with an open compressor bypass valve when engine temperature is less than a first temperature;
- and
- operating the engine at idle conditions with a second EGR percent concentration of cylinder charge, less than the first EGR percent concentration, with a closed compressor bypass valve when engine temperature is greater than the first temperature.
A method, comprising:
- operating an engine at idle conditions with a first EGR percent concentration of cylinder charge with an open turbocharger wastegate when engine temperature is less than a first temperature;
- and
- operating the engine at idle conditions with a second EGR percent concentration of cylinder charge, less than the first EGR percent concentration, with a closed turbocharger wastegate when engine temperature is greater than the first temperature.
A method, comprising:
- operating an engine at idle with a first EGR percent concentration of cylinder charge with an open turbocharger wastegate and compressor bypass valve when engine temperature is less than a threshold;
- and
- operating the engine at idle with a second EGR percent concentration of cylinder charge, less than the first EGR percent concentration, with a closed turbocharger wastegate valve and compressor bypass valve when engine temperature is greater than the threshold.
Dependencies are inferred from the claim text.