KR100299712B1 - Cooling device of water cooled engine for vehicle - Google Patents

Abstract

PURPOSE: A cooling device of a water cooled engine for a vehicle is provided to improve the performance of the engine by controlling the temperature of the cooled water variably according to the rotational frequency of the engine. CONSTITUTION: A water jacket of an engine is connected with a radiator via a supply passage and a withdrawal passage for cooled water and the both passages are interconnected via a bypass passage. A water pump is installed at a connecting part of the withdrawal passage and the bypass passage. A casing(10) is installed rear part of a junction of the supply passage and the bypass passage. A partition(12) is installed at the center of the casing and divides the casing into two parts as a first passage(13a) and a second passage(13b). Thermostats(14a,14b) having different opening temperature are installed at the first and the second passages respectively. A diverter valve(15) is installed at the entrance of the casing to open and close the first and the second passages and is controlled by an ECU.

Description

Chiller for water-cooled engine for vehicles

The present invention relates to a cooling apparatus for a water-cooled engine for a vehicle, and more particularly, to a cooling apparatus for a water-cooled engine for a vehicle for variably adjusting the cooling water temperature according to the rotation speed of the engine.

As is well known, the temperature of the combustion gas in the cylinder of the engine is 2,000 ° C or higher, and since a substantial part of the heat is conducted to the cylinder, the cylinder head, the piston, and the like, the temperature thereof is prevented from being excessively raised. Many cooling devices are used.

The water-cooled cooling device connects the water jacket and the radiator formed on the cylinder block and the cylinder head to the cooling water supply passage and the cooling water recovery passage, and simultaneously connects the cooling water supply passage and the cooling water recovery passage to the bypass passage, and the cooling water supply passage. A thermostat is installed at the rear of the bypass passage branch of the bypass passage, and a water pump is installed at the bypass passage connecting portion of the coolant return passage. When the coolant temperature is low, the thermostat closes the coolant supply passage supplied to the radiator and passes the bypass passage. When the coolant temperature is high, the thermostat is opened so that the coolant is pumped to the radiator by the water pump, cooled by the air, and then formed into a circulation circuit that returns to the water jacket. Normally open and close within 80 ℃ It will have to.

However, the water-cooled cooling device is that the engine is cooled by the outside air in the case of a vehicle running like an automobile when the thermostat is opened and closed only at a coolant temperature of about 80 ° C.

As described above, when the engine is cooled by coolant and outside air, the engine is overcooled at medium and low speeds, and at high speeds, the engine is overheated and the combustion conditions are different. When the fuel consumption rate is increased, and the high speed is high, the efficiency of stacking is lowered, knocking occurs, and the output is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling apparatus for a water-cooled engine for a vehicle in which the cooling water temperature is variably adjusted according to the rotational speed of the engine so that the performance of the engine can be exhibited satisfactorily.

In order to achieve the above object, the present invention connects the water jacket and the radiator of the engine to the cooling water supply passage and the cooling water recovery passage and at the same time connect the both passages to the bypass passage, the bypass passage of the cooling water recovery passage In the case where a water pump is provided at the connecting portion, a casing is provided at the rear of the bypass passage branch of the cooling water supply passage, and a partition is formed at the center thereof to separate the first passage and the second passage, and to form the first passage and the second passage. Thermostats having different opening and closing temperatures are respectively installed in two passages, and a switching valve for opening and closing the first passage and the second passage is installed at the inlet of the casing to be controlled by the electronic control unit.

1 is a schematic diagram of an embodiment of the invention.

2 is a sectional view of principal parts of an embodiment of the present invention;

<Description of the symbols for the main parts of the drawings>

4: water jacket 5: radiator

6, 7: Cooling water supply and recovery passage 8: Bypass passage

10 casing 12 bulkhead

13a, 13b: first and second passages 14a, 14b: first and second thermostats

15: switching valve 16: electronic control unit

1 and 2, the water jacket 4 and the radiator 5 formed in the cylinder block 2 and the cylinder head 3 of the engine 1 are connected to the cooling water supply passage 6, The cooling water supply passage (7) and the cooling water supply passage (6) and the cooling water recovery passage (7) are connected to the bypass passage (8), and the bypass passage (8) of the cooling water recovery passage (7). In the case where the water pump 9 is provided at the connecting portion, the casing 10 to which the cover 11 is coupled is provided at the rear of the bypass passage 8 branching point of the cooling water supply passage 6 to form a center of the casing 10. The first passage 13a and the second passage 13b are divided into partitions 12 by partition wall 12, and the opening and closing temperatures of the first passage 13a and the second passage 13b are different from each other. 2 thermostat 14a, 14b is installed, and a switching valve 15 is installed between the inlet of the casing 10 and the support plate 12 'formed at the partition 12, and the switching An actuator (not shown) such as a motor or a solenoid valve is installed on the shaft of the bar 15 and controlled by the electronic control unit 16. The electronic control unit 16 has a signal such as an engine speed and a throttle valve opening degree. Will be entered.

The first and second thermostats 14a and 14b have the same configuration as that known in the art, including shafts, pallets, valves, and the like, and only the opening and closing temperatures of the first and second thermostats 14a and 14b. On the other hand, the first thermostat 14a sets the opening and closing temperature so that the second thermostat 14b opens and closes at a lower temperature at a temperature higher than the opening and closing temperature of the existing thermostat (about 80 ° C). The second thermostat 14b is used for high speed for the medium and low speed of 14a.

In the present invention as described above, when the coolant temperature is lower than the opening temperature of the first and second thermostats 14a and 14b, the first and second thermostats 14a and 14b are closed. When the coolant temperature is circulated through the pass passage 8 and the cooling water temperature is higher than the opening temperatures of the first and second thermostats 14a and 14b, the first and second thermostats 14a and 14b are selectively opened. When the coolant is circulated to the radiator 5, the engine speed signal input to the electronic control unit 16 when the engine speed is medium to low speed when the coolant circulates to the radiator 5 as described above. Is compared with the map table input to the electronic control unit 16, the actuator switches the switching valve 15 to the direction in which the second passage 13b is closed by the signal output from the electronic control unit 16, The circulation passage is formed toward the first passage 13a and cooled The temperature will be the first thermostat (14a) is opened when it reaches the opening temperature of the first thermostat (14a).

On the other hand, when the engine speed is high, the switching valve 15 is switched in the direction of closing the first passage 13a by the output signal of the electronic control unit 16 and at the opening temperature of the second thermostat 14b. The second thermostat 14b is opened to circulate the coolant at a temperature lower than the temperature flowing through the first passage 13a to the radiator 5.

As above, the coolant temperature is maintained at high and low speeds while the engine is cooled by the outside air, and the coolant temperature is maintained at low and medium speeds. Proper temperature is maintained by increasing cooling.

As described above, the present invention forms a first passage and a second passage separated by a partition wall in the casing, and installs first and second thermostats having different opening and closing temperatures in the first passage and the second passage, By installing a switching valve for switching the first and second passages at the inlet, it is possible to maintain the engine temperature at an appropriate temperature by keeping the coolant temperature high according to the engine speed and low during high speed rotation of the engine. Therefore, when the medium and low speed rotation, the harmful exhaust gas is reduced and fuel economy is improved, and when the high speed rotation, the volume efficiency is improved, knocking is prevented, and the output is improved.

Claims (1)

In the water jacket and radiator of the engine connected to the cooling water supply passage and the cooling water recovery passage, the both passages are connected to the bypass passage, and a water pump is provided at the connection of the bypass passage of the cooling water recovery passage. A casing is installed at the rear of the bypass passage branch of the cooling water supply passage to form a partition at the center thereof to form a first passage and a second passage, and a thermostat having a different opening and closing temperature between the first passage and the second passage is formed. And a switching valve for opening and closing the first passage and the second passage at the inlet of the casing, respectively, to control the vehicle water-cooled engine.

Images