Patent ID: 11959442
Assignee: ECONTROLS, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A method of circulating engine exhaust gas from an exhaust system of an internal combustion engine to an intake system of the internal combustion engine, the method comprising:
cooling exhaust gas from the exhaust system with a first cooler, the first cooler configured to cool exhaust gas from the exhaust system using a coolant fluid, the first cooler comprising a first coolant fluid inlet configured to accept the coolant fluid and a first coolant fluid outlet configured to discharge the coolant fluid;
mixing the exhaust gas cooled by the first cooler with engine intake air from the intake system in a mixing chamber to form an exhaust-air mixture;
cooling the exhaust-air mixture with a second cooler configured to cool the exhaust-air mixture using the coolant fluid, the second cooler comprising a second coolant fluid inlet configured to accept the coolant fluid and a second coolant fluid outlet configured to discharge the coolant fluid;
circulating and cooling the coolant fluid used by the first cooler and the second cooler through a heat exchange system using at least one coolant fluid pump and at least one heat exchanger;
calculating, using an engine control module (ECM), a dewpoint temperature of the exhaust-air mixture based on readings taken from a sensor assembly;
determining, using the ECM, a temperature of the exhaust-air mixture using readings from a throttle inlet sensor associated with the internal combustion engine system;
comparing, using the ECM, a temperature of the exhaust-air mixture measured by the sensor assembly to the dewpoint temperature; and
controlling the heat exchange system, using the ECM, to adjust at least one of a coolant fluid temperature and a coolant fluid amount of the coolant fluid supplied to the second coolant inlet based on the comparison.