US 10,947,932 B2 · Methods and systems for adjusting a flow of gases in a scavenge exhaust gas recirculation system of a split exhaust engine system

Abstract

Methods and systems are provided for adjusting operation of a split exhaust engine system based on a total flow of gases through a scavenge exhaust gas recirculation system of the split exhaust engine system. In one example, a method may include setting a cam timing correction based on a difference between a first value and a second value of a flow through an exhaust gas recirculation (EGR) passage, the first value determined based on a first parameter set including a cylinder valve overlap area and the second value determined based on a second parameter set not including the cylinder valve overlap area, and operating at least one of an intake cam and an exhaust cam at a corrected timing using the cam timing correction. In this way, the flow through the EGR passage may be adjusted even without active control of a valve coupled in the EGR passage.

Claims20

Dependent claims

A method for operating an engine system comprising:

via a controller,
setting a cam timing correction based on a difference between a first determination and a second determination of an exhaust flow through an exhaust gas recirculation (EGR) passage detected by at least one sensor, the first determination based on a cylinder valve overlap and the second determination independent of the cylinder valve overlap;
and
operating at least one of an intake cam and an exhaust cam of the engine system at a corrected timing using the cam timing correction.

1 more element

A method for operating a vehicle including an engine and a controller, comprising:

adjusting, via the controller, a cam adaptive term based on a first flow rate of gases through a scavenge exhaust gas recirculation (SC-EGR) passage to an intake passage of the engine and a second flow rate of the gases, the first flow rate determined based on a valve opening overlap area between scavenge exhaust valves and intake valves coupled to cylinders of the engine, the intake valves coupling the cylinders to an intake manifold and the scavenge exhaust valves coupling the cylinders to the SC-EGR passage via a scavenge manifold, and the second flow rate determined based on a delta pressure between the SC-EGR passage and the intake passage detected by at least one sensor;
and
operating, via the controller, at least one of an intake cam and an exhaust cam at a corrected timing based on the cam adaptive term.

An engine system, comprising:

a plurality of cylinders, each including an intake valve, a scavenge exhaust valve, and a blowdown exhaust valve;
an intake manifold coupled to the intake valve of each cylinder and an intake passage;
a scavenge manifold coupled to the scavenge exhaust valve of each cylinder and the intake passage, upstream of a compressor, via a scavenge exhaust gas recirculation (SC-EGR) passage;
a blowdown manifold coupled to the blowdown exhaust valve of each cylinder and an exhaust passage including a turbine;
and
a controller storing computer readable instructions on non-transitory memory that, when executed during engine operation, cause the controller to:
determine a first value of a total flow of gases through the SC-EGR passage based on a valve opening overlap area between the scavenge exhaust valve and the intake valve;
determine a second value of the total flow of gases through the SC-EGR passage based on a delta pressure between the intake passage and the SC-EGR passage detected by at least one sensor, the second value time-aligned with the first value;
and
adjust an operating parameter of the engine based on the first value and the second value.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/450,818Filed 24 Jun 2019

Published

US 2020/0400106 A124 Dec 2020

Granted

16 Mar 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

F02M 26/14
Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories: in relation to the exhaust…
F01N 13/107
Of exhaust manifolds: more than one exhaust manifold or exhaust collector
F02B 37/025
Gas passages between engine outlet and pump drive, e.g. reservoirs: multiple scrolls or multiple gas passages guiding the gas to the pump drive
F02D 13/0203
During engine operation: variable control of intake and exhaust valves

Methods and systems for adjusting a flow of gases in a scavenge exhaust gas recirculation system of a split exhaust engine system

Life of this patent

Methods and systems for adjusting a flow of gases in a scavenge exhaust gas recirculation system of a split exhaust engine system

Life of this patent

Abstract

Claims20