Vehicle exhaust heat recovery system and method

Patent metadata

Field	Value
Publication number	US-9790841-B2
Application number	US-201514806285-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Dec 15, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

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.

First claim

What is claimed is:

1. 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.

2. The exhaust heat recovery system of claim 1 , wherein
the engine has a passage communicating between a cylinder head and a cylinder block such that the coolant flows in the passage; and
the second valve comprises a cylinder head-side valve for blocking circulation of the coolant from the cylinder head of the engine to the coolant circulation circuit, and a cylinder block-side valve for blocking circulation of the coolant from the cylinder block of the engine to the coolant circulation circuit.

3. The exhaust heat recovery system of claim 2 , wherein the water pump is mounted to the cylinder head of the engine to be driven by receiving rotational force through a drive belt from a cam shaft or a crank shaft.

4. The exhaust heat recovery system of claim 1 , wherein when the temperature of the coolant detected by the temperature sensor is less than the first temperature, the controller opens the first valve to open a coolant passage of the exhaust heat exchanger, opens the cylinder head-side valve and closes the cylinder block-side valve of the second valve to decrease a flow rate of the coolant passing through the engine by opening of only a cylinder head-side coolant passage of the engine, controls the third valve to open a passage of the coolant flowing to the water-cooled intercooler while closing a passage of the coolant flowing to the sub-radiator, and controls the fourth valve to close a passage of the coolant flowing to the radiator.

5. The exhaust heat recovery system of claim 1 , wherein when the temperature of the coolant detected by the temperature sensor is equal to or greater than the first temperature, the controller opens the first valve to open a coolant passage of the exhaust heat exchanger, opens the cylinder head-side valve and the cylinder block-side valve to open both of a cylinder head-side coolant passage and a cylinder block-side coolant passage of the engine, controls the third valve to close a passage of the coolant flowing to the water-cooled intercooler while opening a passage of the coolant flowing to the sub-radiator, and closes the fourth valves to close a passage of the coolant flowing to the radiator.

6. The exhaust heat recovery system of claim 1 , wherein when the temperature of the coolant detected by the temperature sensor is equal to or greater than the second temperature and is less than the third temperature, the controller closes the first valve to close a coolant passage of the exhaust heat exchanger, opens the cylinder head-side valve and the cylinder block-side valve to open both of a cylinder head-side coolant passage and a cylinder block-side coolant passage of the engine, controls the third valve to close a passage of the coolant flowing to the water-cooled intercooler while opening a passage of the coolant flowing to the sub-radiator, and closes the fourth valves to close a passage of the coolant flowing to the radiator.

7. The exhaust heat recovery system of claim 1 , wherein when the temperature of the coolant detected by the temperature sensor is equal to or greater than the third temperature, the controller closes the first valve to close a coolant passage of the exhaust heat exchanger, opens the cylinder head-side valve and the cylinder block-side valve to open both of a cylinder head-side coolant passage and a cylinder block-side coolant passage of the engine, controls the third valve to close a passage of the coolant flowing to the water-cooled intercooler while opening a passage of the coolant flowing to the sub-radiator, and opens the fourth valves to open a passage of the coolant flowing to the radiator.

8. 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.

9. The vehicle exhaust heat recovery method of claim 8 , wherein the preheating coolant and intake air comprises:
preheating the coolant by opening a passage of the coolant circula

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee Joon-Hee
• Lee Jun-Yong
• Lee Myung-Jun

Classifications

• F01P3/18

  Arrangements or mounting of liquid-to-air heat-exchangers (such arrangements on cylinders or cylinder heads F01P3/04; relative to vehicles B60K11/04) · CPC title

• F01P2003/027

  Cooling cylinders and cylinder heads in parallel · CPC title

• F01P7/16 Primary

  by thermostatic control · CPC title

• F01P2060/16

  Outlet manifold · CPC title

• F01P2037/02

  starting · CPC title