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US 8,301,358 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.
Claims19
A method, comprising:
- operating an engine at idle conditions with a first EGR percent concentration of cylinder charge 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, when engine temperature is greater than the first temperature, a glow plug being activated and deactivated responsive to EGR percentage or engine exhaust temperature.
A method, comprising:
- operating an engine at idle conditions with a first cylinder air charge and a first cylinder EGR amount when engine temperature is less than a first engine temperature;
- operating the engine at idle conditions with a second cylinder air charge and a second cylinder EGR amount when engine temperature is greater than the first engine temperature, the second EGR amount and the second cylinder air charge less than the first EGR amount and the first cylinder air charge, the second EGR amount reduced by a proportionally greater amount from the first EGR amount as the second cylinder air charge is reduced from the first cylinder air charge;
- and
- lowering an intake manifold pressure via opening a compressor bypass valve.
1 more element
An engine system, comprising:
- an engine;
- an EGR valve in pneumatic communication with the engine;
- a glow plug coupled to the engine;
- a controller, the controller including instructions to operate the engine at idle conditions with the EGR valve at a first EGR valve position when the engine is operating at a first engine temperature, the controller including instructions to operate the engine at idle conditions with the EGR valve at a second EGR valve position when the engine is operated at an engine temperature greater than the first engine temperature, the second EGR valve position opened less than the first EGR valve position, the controller including further instructions to heat a combustion chamber of the engine after a start via the glow plug when engine temperature is less than the first engine temperature.
1 more element
Dependencies are inferred from the claim text.