Alternative left/right bank EGR loop operation to improve fouling resistance during low mass flow engine mode
AssigneeFord Global Technologies, LLC
InventorJoseph Grandas
Life of this patent
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Abstract
A system for a vehicle, comprising of a diesel engine having an intake system and an exhaust system, a first EGR loop coupled between said intake system and said exhaust system and having a first valve and a first cooler located therein, a second EGR loop coupled between said intake system and said exhaust system and having a second valve and a second cooler located therein, and a control system operating the first and second valves in a first condition where both valves provide EGR flow to the engine, and at least temporarily increasing flow in the first EGR loop and decreasing flow in the second EGR loop when EGR flow is decreased to a condition where buildup in one of said coolers is increased.
Claims18
A system for a vehicle, comprising:
- a diesel engine having an intake system and an exhaust system;
- a first EGR loop coupled between said intake system and said exhaust system and having a first valve and a first cooler located therein;
- a second EGR loop coupled between said intake system and said exhaust system and having a second valve and a second cooler located therein;
- and
- a control system operating the first and second valves in a first condition where both valves provide EGR flow to the intake system of the engine, and operating the first and second valve to at least temporarily increase flow in the first EGR loop and decrease flow in the second EGR loop to decrease solid build up in a second condition where EGR flow is decreased.
A method of operating an engine having a first exhaust gas recirculation loop and second exhaust gas recirculation loop, the loops having respectively a first and second valve located therein and a first and second cooler located therein, the method comprising:
- during a first condition, operating with both the first and second valves providing at least some flow;
- and
- during a second condition, operating with the first valve providing more flow to the first cooler than during said first condition and the second valve providing less flow to the second cooler than during said first condition,
- wherein said second condition reduces a build up of a solid in at least the first cooler.
A method of operating an engine having a first exhaust gas recirculation loop and second exhaust gas recirculation loop, the loops having respectively a first and second valve located therein and a first and second cooler located therein, the method comprising:
- during a first condition, operating with both the first and second valves providing at least some flow;
- during a second condition, operating with the first valve providing more flow to the first cooler than during said first condition and the second valve closed;
- and
- during a third condition, operating with the first valve closed and the second valve providing more flow to the second cooler than during said first condition,
- wherein said second condition and third condition reduce a build up of a solid in the first cooler and second cooler.
Dependencies are inferred from the claim text.