Vehicle exhaust heat recovery system and method
AssigneeHyundai Motor Company
InventorsJoon-Hee Lee, Jun-Yong Lee, Myung-Jun Lee
Life of this patent
Estimating the term…
Abstract
An exhaust heat recovery system may include a coolant circulation circuit arranged to connect an engine, an exhaust heat exchanger, a radiator, a water-cooled intercooler, and a sub-radiator, and controls each valve arranged on a passage which connects the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator to the coolant circulation circuit according to the coolant temperature so as to control temperatures of coolant and intake air, thereby enabling the engine to be rapidly warmed up.
Claims16
An exhaust heat recovery system comprising:
- an exhaust heat exchanger transferring heat energy of exhaust gas discharged from an engine to coolant to increases a temperature of the coolant;
- a radiator radiating heat of the coolant heated through heat exchange with the engine;
- a water-cooled intercooler cooling intake air using the coolant;
- a sub-radiator radiating heat of the coolant heated through the water-cooled intercooler;
- a coolant circulation circuit arranged to connect the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator;
- a water pump allowing the coolant to be circulated along the coolant circulation circuit through the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator;
- a first valve for opening and closing connection between the exhaust heat exchanger and the coolant circulation circuit;
- a second valve for opening and closing connection between the engine and the coolant circulation circuit;
- a third valve mounted on a distribution line for distributing the coolant supplied along the coolant circulation circuit to the water-cooled water pump and the sub-radiator;
- a fourth valve for opening and closing connection between the radiator and the coolant circulation circuit;
- a temperature sensor for measuring the temperature of the coolant circulated along the coolant circulation circuit;
- and
- a controller adjusting opening degrees of the first to fourth valves according to the temperature of the coolant measured by the temperature sensor,
- wherein the controller preheats the coolant and the intake air when the temperature of the coolant detected by the temperature sensor is less than a first temperature, preheats the coolant and cools the intake air when the temperature of the coolant detected by the temperature sensor is equal to or greater than the first temperature and is less than a second temperature, cools the coolant and the intake air when the temperature of the coolant detected by the temperature sensor is equal to or greater than the second temperature and is less than a third temperature, and cool the engine when the coolant temperature detected by the temperature sensor is equal to or greater than the third temperature, by adjusting the opening degrees of the first to fourth valves.
A vehicle exhaust heat recovery method using a vehicle exhaust heat recovery system having a circulation circuit of coolant circulated along an engine, an exhaust heat exchanger, a radiator, a water-cooled intercooler, and a sub-radiator for cooling an engine, comprising:
- detecting a temperature of the coolant;
- preheating coolant and intake air by controlling an amount of the coolant circulated in each of the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator when the temperature of the coolant is less than a predetermined first temperature;
- preheating coolant and cooling intake air by controlling an amount of the coolant circulated in each of the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator when the temperature of the coolant is equal to or greater than the predetermined first temperature and is less than a predetermined second temperature;
- cooling coolant and intake air by controlling an amount of the coolant circulated in each of the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator when the temperature of the coolant is equal to or greater than the predetermined second temperature and is less than a predetermined third temperature;
- and
- cooling the engine by controlling an amount of the coolant circulated in each of the engine, the exhaust heat exchanger, the radiator, the water-cooled intercooler, and the sub-radiator when the temperature of the coolant is equal to or greater than the predetermined third temperature.
Dependencies are inferred from the claim text.