Charge air cooling system

Patent metadata

Field	Value
Publication number	US-9551273-B2
Application number	US-201013258202-A
Country	US
Kind code	B2
Filing date	Mar 15, 2010
Priority date	Mar 23, 2009
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A charge air cooler includes a high temperature side heat exchanger and a low temperature side heat exchanger. The high temperature side heat exchanger is provided on a high temperature side cooling flow path through which a first refrigerant cooled by a first heat exchanger (radiator) flows. The low temperature side heat exchanger is provided on a low temperature side cooling flow path through which a second refrigerant cooled cooler than the first refrigerant by a second heat exchanger (sub-radiator) flows. The low temperature side heat exchanger cools, by the second refrigerant, intake air cooled by the high temperature side heat exchanger. According to the above charge air cooler, the second heat exchanger (sub-radiator) can be prevented from becoming big in size, and intake air temperature can be cooled to desired temperature.

First claim

The invention claimed is:

1. A charge air cooling system comprising:
an internal combustion engine connected to a supercharger;
a first heat exchanger for cooling a first refrigerant;
a second heat exchanger for cooling a second refrigerant such that the second refrigerant is cooler than the first refrigerant;
a high temperature side cooling flow path through which the first refrigerant cooled by the first heat exchanger flows;
a low temperature side cooling flow path through which the second refrigerant cooled by the second heat exchanger flows;
a charge air cooler connected to the supercharger, the charge air cooler including:
a high temperature side heat exchanger that is provided on the high temperature side cooling flow path and cools, by the first refrigerant, supercharged intake air, and
a low temperature side heat exchanger that is provided on the low temperature side cooling flow path and cools, by the second refrigerant, intake air cooled by the high temperature side heat exchanger;
a bypass pathway, provided on an intake air flow passage downstream of the high temperature side heat exchanger, in parallel with the low temperature side heat exchanger; and
a thermostatic regulating valve, for controlling temperature of intake air to be supplied to the internal combustion engine, by regulating:
a flow rate of intake air that has exchanged heat at the low temperature side heat exchanger, and
a flow rate of intake air that has flowed through the bypass pathway,

wherein the first refrigerant is refrigerant of an internal combustion engine cooling system, and
wherein the second refrigerant is refrigerant of a refrigerant recirculation system of an air-conditioning cycle.

2. The charge air cooling system according to claim 1 , further comprising a case that includes:
an induction pipe,
an eduction pipe, and
a flow path along which intake air introduced through the induction pipe and dischargeable through the eduction pipe flows,
wherein the high temperature side heat exchanger and the low temperature side heat exchanger are formed integrally and housed within the case,
wherein the high temperature side heat exchanger is disposed upstream of the flow path within the case, and
wherein the low temperature side heat exchanger is disposed downstream of the flow path within the case.

3. The charge air cooling system according to claim 1 ,
wherein a temperature of the second refrigerant is such that intake air to be supplied to an internal combustion engine is coolable by the second refrigerant so as to have an intake air temperature that is a target temperature.

4. The charge air cooling system according to claim 1 ,
wherein a condenser for cooling air-conditioning refrigerant is disposed within a tank of the second heat exchanger, and
wherein the air-conditioning refrigerant is cooled by the second refrigerant flowing through the low temperature side cooling flow path.

5. A charge air cooling system comprising a charge air cooler according to claim 1 ,
wherein a first EGR cooler is provided on the high temperature side cooling flow path, and a second EGR cooler is provided on the low temperature side cooling flow path.

6. The charge air cooling system according to claim 5 , wherein the first EGR cooler and the second EGR cooler are formed integrally.

7. The charge air cooling system according to claim 1 ,
wherein the thermostatic regulating valve regulates the flow rate of intake air that has exchanged heat at the low temperature side heat exchanger and the flow rate of intake air that has flowed through the bypass pathway according to intake air target temperature based on fuel consumption.

8. The charge air cooling system according to claim 1 , further comprising a switching valve disposed upstream of the high temperature side heat exchanger,
wherein one of compressed intake air compressed by a supercharger and natural intake air that did not flow through the supercharger is selectively supplied to the high temperature side heat exchanger by the switching valve.

9. The charge air cooling system according to claim 8 , wherein the switching valve is controllable to:
supply the natural intake air during a period before a switching point while an intake air pressure of the compressed intake air is lower than an intake air pressure of the natural intake air after acceleration is started, or
supply the compressed intake air during a period after the switching point while the intake air pressure of the compressed intake air is higher than the intake air pressure of the natural intake air after acceleration is started.

10. The charge air cooling system according to claim 9 ,
wherein the supercharger is a turbocharger, and
wherein the period before the switching point is an acceleration initial stage of the internal combustion engine supercharged by the turbocharger, a period while a turbine of the turbocharger does not rotate sufficiently, or a period while intake air takes on negative pressure.

11. The charge air cooling system according to claim 1 , wherein the low temperature side heat exchanger includes a heat storage material.

Assignees

• Iwasaki Mitsuru
• Calsonic Kansei Corp

Inventors

• Iwasaki Mitsuru

Classifications

• Y02T10/146

  Cross-Sectional Technologies · mapped topic

• F02M26/24

  with two or more coolers · CPC title

• F02M26/32

  Liquid-cooled heat exchangers · CPC title

• F02B29/0462

  Liquid cooled heat exchangers · CPC title

• F02B29/0418

  the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface · CPC title