KR20120050845A

KR20120050845A - Circulation circuit of cooling water for engine

Info

Publication number: KR20120050845A
Application number: KR1020100112302A
Authority: KR
Inventors: 이봉상
Original assignee: 현대자동차주식회사
Priority date: 2010-11-11
Filing date: 2010-11-11
Publication date: 2012-05-21

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling water circulation circuit of an automotive engine capable of shortening the warm-up time of the engine to reduce heat loss and improving fuel efficiency through early reduction of frictional resistance.
The present invention is applied to the cooling water circulation circuit of an automotive engine in which the coolant heated in the engine by applying the first and second thermostats circulates the heater and other components, the radiator and the bypass passage, and then circulates back to the engine by the water pump. The coolant pumped by the water pump is supplied to the cylinder block of the engine and the cylinder engine separately, and the coolant heated while circulating the cylinder block is joined with the heated coolant while circulating the cylinder head through the cylinder head. It provides a cooling water circulation circuit of the vehicle engine discharged through.

Description

Circulation Circuit of Cooling Water For Engine

The present invention relates to a cooling water circulation circuit of an automobile engine, and more particularly, by preventing cooling in an unnecessary area according to an operating condition of an engine, shortening the engine warm-up time to reduce heat loss and at the same time reducing frictional resistance. Through the cooling water circulation circuit of the vehicle engine to improve the fuel economy through.

In automobiles, the heat generated by the engine is divided into energy used to raise the temperature of the engine and energy used to overcome friction, energy used to push pistons or move various instruments (CAM, etc.) and exhaust energy.

Accordingly, energy efficiency can be improved by preserving heat energy generated from the engine as much as possible and reducing losses. This can be achieved by shortening the engine warm-up time and reducing frictional resistance at the time of disclosure.

The shortening of the warm-up time is made possible by reducing the thermal energy discharged through the cooling water in the initial starting section (section where cooling is not necessary due to the low heat load), and reducing the loss of friction (except fuel injection amount) through early warm-up. It also becomes possible.

Considering this point, the cooling system of an automobile engine includes air-cooling to directly cool the engine with external air, and water-cooling to circulate and cool the cooling water into the engine.

In the above water-cooled cooling system according to the present invention is to circulate the cooling water in the water jacket formed in the cylinder block and the cylinder head to perform the cooling, the radiator radiating heat energy of the cooling water by the rotation of the cooling fan And a water pump for forcibly circulating the cooling water, and a thermostat for maintaining a proper temperature of the cooling water by adjusting the flow rate of the valve automatically by opening and closing the valve according to the temperature change in the engine.

In the cooling system configured as described above, referring to a configuration of a general separate cooling circuit, the cooling water introduced through the first thermostat 2 is pumped by the water pump 4 as shown in FIG. It is supplied separately to the cylinder block 8 and the cylinder head 10 of 6).

In addition, the cooling water heated while circulating the cylinder block 8 and the cooling water heated while circulating the cylinder head 10 are joined again and circulated to the downstream side, and the cooling water circulating in the cylinder block 8 is a second thermostat. After passing through the stats 12 will join.

After the cooling cycle of the engine is performed as described above, the first thermostat (2) is branched into three branches and partially cooled by cold external air introduced by a cooling fan (not shown) while passing through the radiator 14. The other part flows into the auxiliary device 16 for providing hot water of the heater or the throttle valve and supplying the cooling water such as the turbocharger, and then heats or cools and then flows into the first thermostat 2; Some are bypassed to form a circulation structure that flows directly into the first thermostat (2).

However, in the conventional cooling structure as described above, when the second thermostat is not opened, the cooling water pumped from the water pump can reduce the cooling loss by filling and stagnating the cylinder block, but structurally between the cylinder head and the block. As a flow is generated through the minute leakage hole, the warm-up time has a problem.

In addition, since the second thermostat is configured as a temperature sensitive type and reacts only by temperature, it does not respond quickly to sudden operating conditions such as rapid acceleration, and thus has another problem due to a large restriction on thermal load reduction of the engine. .

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to reduce the heat loss by reducing the engine warm-up time and to improve the fuel economy through the early reduction of friction resistance To provide a cooling water circulation circuit.

In order to realize the above object, the present invention, by applying the first and second thermostat, the coolant heated in the engine is circulated back to the engine by the water pump after circulating the heater and other components, the radiator and the bypass passage, respectively In the cooling water circulation circuit of an automobile engine,

The coolant pumped from the water pump is supplied to the cylinder block of the engine and the cylinder engine, and the coolant heated while circulating the cylinder block is joined with the heated coolant while circulating the cylinder head through the cylinder head, through one path. Provides a cooling water circulation circuit of the discharged vehicle engine.

The first thermostat is disposed upstream of the water pump, and the second thermostat is disposed between the water pump and the cylinder block.

In the above, the first thermostat is applied in a temperature-sensitive manner, the second thermostat is characterized in that applied to the electronic thermostat controlled by the ECU.

Wherein the first thermostat is characterized in that the three-way valve that can be supplied to the engine to the minimum of the coolant of the bypass coolant and other components even if the coolant circulation from the radiator is blocked.

In the above, the first thermostat is disposed on the rear side of the cylinder head, and the second thermostat is disposed between the water pump and the cylinder block.

As described above, the present invention adopts the engine inlet control method and the variable separation control method according to the operating conditions of the engine. The longer the circulation water of the coolant, the longer the cooling water stays in the engine. In other words, it will be able to make the most of the heat dissipation.

In the initial start-up of the engine, the coolant in the cylinder block is kept circulated without circulating, thereby premature warm-up is possible. As it enters the cylinder head, the cylinder head is heated to shorten the warm-up time.

In addition, it is possible to shorten the warm-up time of the engine as described above to reduce heat loss and at the same time improve fuel efficiency through early reduction of frictional resistance.

These drawings are for reference in describing exemplary embodiments of the present invention and the technical spirit of the present invention should not be construed as being limited to the accompanying drawings.
1 is a general coolant circulation circuit diagram.
2 is a cooling water circulation circuit according to the present invention.
3 is a cooling water circulation circuit in the off operation of the second thermostat.
4 is a cooling water circulation circuit in the on-operation of the second thermostat.
5 is a coolant circulation circuit diagram in the on operation of the first and second thermostat.
6 is a cooling water circulation circuit diagram of another embodiment according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In the following detailed description, the names of the components are divided into first, second, and the like in order to distinguish the names of the components in the same relationship, and the descriptions of the components are not necessarily limited to the order in the following description.

2 is a coolant circulation circuit diagram according to the present invention, wherein reference numeral 20 denotes an engine, and the engine 20 is separated into a cylinder block 22 and a cylinder head 24. In the present invention, the cylinder block 22 Cooling water is supplied through the cooling water passages respectively separated to the and head 24.

In more detail, the coolant introduced through the first thermostat 26 is pumped by the water pump 28 and separately supplied to the cylinder block 22 and the cylinder head 24 of the engine 20. The second thermostat 30 is disposed between the water pump 28 and the cylinder block 22.

In the above water pump 28 is applied to the clutch water pump controlled by the engine control unit (ECU) according to the operating conditions of the engine, the first thermostat 26 is a temperature response using a wax (WAX), etc. Equation is applied, the second thermostat 30 applies an electronically controlled thermostat controlled by an engine control unit (ECU) not shown.

Accordingly, the water pump 28 is operated and controlled according to the heat load condition of the engine, the first thermostat 26 is opened and closed according to the coolant temperature, the cylinder according to the operation of the second thermostat 30 It is determined whether the block 22 is circulated with coolant.

The coolant heated while circulating the cylinder block 22 flows into the cylinder head 24 to join the heated coolant while circulating the cylinder head 24, and then circulates downstream through the tail of the cylinder head 24. do.

After the cooling cycle of the engine is performed as described above, the first branch is divided into three branches, and the first thermostat 26 is cooled by cold external air introduced by a cooling fan (not shown) while passing through the radiator 32. The other part is introduced into the auxiliary device 34 for providing hot water of the heater or throttle valve and supplying cooling water such as a turbocharger, and then heating or cooling to the first thermostat 26, and the other Some are bypassed to form a circulation structure that directly enters the first thermostat 26.

The present invention having the coolant circulation circuit as described above adopts the engine inlet control method and the variable separation control method according to the operating conditions of the engine.

And the first thermostat 26 in the above is made of a temperature-sensitive as described above, it is made of a known three-way valve.

More specifically, even if the first thermostat 26 is closed to block the coolant circulation from the radiator 32, the minimum flow rate of the bypass coolant supplied to the bypass passage flows out and the coolant used to supply the other parts 34. Joined with and configured to be introduced into the engine 20 side.

Accordingly, in the warm-up period, as shown in FIG. 3, the second thermostat 30 is turned off to block the coolant from flowing into the cylinder block 22.

Then, the coolant in the cylinder block 22 is kept in a stagnant state, thereby enabling early warm-up. After a predetermined time has elapsed in this state, the second thermostat 30 is turned on as shown in FIG. 4. The coolant is circulated to the cylinder block 22.

When the coolant flows into the cylinder block 22 as described above, the hot coolant absorbing heat from the cylinder block flows into the cylinder head 24, thereby shortening the warm-up time by heating the cylinder head 24.

That is, the present invention intends to make the most of the heat dissipation by lengthening the copper wire of the coolant to secure a longer time for the coolant to stay in the engine.

When the engine is normally warmed up and brought to a normal state, the coolant is in a high temperature state, and thus the first thermostat 26 is opened, thereby forming a coolant circuit having a state as shown in FIG.

As described above, in the separate cooling circuit using the clutch water pump, the second thermostat 30 controlled by the engine control unit (ECU) is disposed on the inlet side of the cylinder block 22 to provide a second thermostat. When the stat 30 is controlled on, the coolant is moved to the cylinder head 24 through the cylinder block 22, so that the cooling is made.

FIG. 6 illustrates another embodiment according to the present invention. In the embodiment of the present invention, the first thermostat 26 is disposed upstream of the water pump 28. In another embodiment, the first thermostat is shown. Reference numeral 26 is disposed on the rear side of the cylinder head 24.

In another embodiment as described above is applied as a general thermostat instead of a three-way valve, it is possible to obtain the same action and effect as the effect of the present invention only by changing the position.

That is, by blocking the outlet of the coolant until the engine 20 rises to the normal temperature, the coolant that has been supplied to the cylinder block 22 and the cylinder head 24 of the engine 20 is stagnant and heated, thereby premature warm-up. You will get a working effect to make.

As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it is within the scope of the present invention.

20 ... Engine 22 ... Cylinder Block
24 ... cylinder head 26 ... 1st thermostat
28 ... water pump 30 ... second thermostat
32 ... radiator

Claims

In the cooling water circulation circuit of an automotive engine in which the coolant heated in the engine by applying the first and second thermostats circulates the heater and other components, the radiator and the bypass passage, and then circulates back to the engine by the water pump.
The coolant pumped from the water pump is supplied to the cylinder block of the engine and the cylinder engine, and the coolant heated while circulating the cylinder block is joined with the heated coolant while circulating the cylinder head through the cylinder head, through one path. Cooling water circulation circuit of the vehicle engine, characterized in that to discharge.

The cooling water circulation circuit of claim 1, wherein the first thermostat is disposed upstream of the water pump, and the second thermostat is disposed between the water pump and the cylinder block.

The cooling water circulation circuit of claim 2, wherein the first thermostat is formed in a temperature sensitive manner, and the second thermostat is formed of an electronic thermostat controlled by an ECU.

4. The coolant circulation of an automotive engine according to claim 3, wherein the first thermostat is applied with a three-way valve which can supply the engine with bypass coolant and other components coolant to a minimum even if the coolant circulation from the radiator is blocked. Circuit.

The cooling water circulation circuit according to claim 1, wherein the first thermostat is disposed at the rear side of the cylinder head, and the second thermostat is disposed between the water pump and the cylinder block.

The cooling water circulation circuit of claim 5, wherein the first thermostat is formed in a temperature-sensitive manner, and the second thermostat is formed of an electronic thermostat controlled by an ECU.