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US 10,648,413 B2Granted
Method for determining a dilution of recirculated gases in a split exhaust engine
AssigneeFord Global Technologies, LLC
InventorsDaniel Madison, Joseph Ulrey, Gopichandra Surnilla, Mohannad Hakeem, Ross Dykstra Pursifull
Life of this patent
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Abstract
Methods and systems are provided for determining a dilution of recirculated gases, including blowthrough air, combusted exhaust gas, and fuel vapor, in a split exhaust engine. In one example, the dilution rate may be calculated using a steady state model based on temperature measurements from an intake region of the engine. The steady state model may be further used in combination with a feedforward model adapted to estimate engine dilution during engine transients as a correction factor.
Claims18
A method comprising:
- determining, via an electronic controller, a dilution rate of gas recirculated from a first set of exhaust valves to an intake passage via a recirculation passage based on a differential pressure across a flow constriction positioned in the intake passage downstream of where the recirculation passage couples to the intake passage, a temperature of gases in each of the recirculation passage and the intake passage, upstream and downstream of where the recirculation passage couples to the intake passage, while flowing exhaust gas from a second set of exhaust valves to a turbocharger turbine and not to the intake passage;
- and
- adjusting, via the electronic controller, one or more of fuel injection to engine cylinders and spark timing based on the determined dilution rate.
A method, comprising:
- flowing gases from a first set of exhaust valves to a compressor disposed in an intake passage and flowing exhaust gas from a second set of exhaust valves to a turbine disposed in an exhaust passage and not to the intake passage, where each cylinder of a plurality of engine cylinders includes one valve of the first set of exhaust valves and one valve of the second set of exhaust valves;
- determining a dilution rate of the gases flowing from the first set of exhaust valves to the compressor based on a differential pressure across a flow constriction positioned in the intake passage downstream of where a recirculation passage couples to the intake passage, and a temperature of each of:
- the gases flowing from the first set of exhaust valves to the compressor, before the gases enter the intake passage, intake air flowing in the intake passage, upstream of where the gases from the first set of exhaust valves enter the intake passage, and combined gases flowing through the intake passage, downstream of where the gases from the first set of exhaust valves enter the intake passage;
- and
- adjusting one or more of fuel injection to the plurality of engine cylinders and spark timing based on the determined dilution rate.
2 more elements
A system for an engine, comprising:
- a first set of exhaust valves exclusively coupled to a first exhaust manifold, the first exhaust manifold coupled to an intake passage, upstream of a turbocharger compressor, via an exhaust gas recirculation (EGR) passage, the EGR passage including an EGR valve;
- a second set of exhaust valves exclusively coupled to a second exhaust manifold coupled to an exhaust passage, upstream of a turbocharger turbine disposed in the exhaust passage;
- a plurality of engine cylinders, each cylinder including one of the first set of exhaust valves and one of the second set of exhaust valves;
- and
- a controller including memory with instructions stored thereon for:
- determining a dilution rate of gases flowing from the first set of exhaust valves to the turbocharger compressor via the EGR passage based on a first temperature of gases in the EGR passage, a second temperature of gases in the intake passage, upstream of where the EGR passage couples to the intake passage, and a third temperature of gases in the intake passage, downstream of the turbocharger compressor;
- and
- adjusting spark timing and fuel injection to the plurality of engine cylinders based on the determined dilution rate,
- wherein the instructions further include instructions for determining the dilution rate based on engine speed, engine load, a cam timing of the first set of exhaust valves, and a differential pressure across the EGR valve and a flow constriction positioned in the intake passage downstream of where the EGR passage couples to the intake passage.
6 more elements
Dependencies are inferred from the claim text.