KR19990053384A - Variable Cooling System of Turbocharged Engine - Google Patents

Abstract

The bypass pipe 40 provided between the intake manifold of the engine 10 and the turbocharger 20, and the air inputted through the two flow paths in parallel with the bypass pipe 40 described above. First and second flow paths for opening and closing the two flow paths of the intercooler 50 for cooling, the bypass valve 60 for opening and closing the bypass pipe 40, and the intercooler 50, respectively. It consists of a valve (70, 80), the bypass valve 60 and the control unit 90 for opening and closing the first and second flow path valves (70, 80) according to the speed and load of the engine, the speed of the engine And it provides a variable cooling system of the turbocharge engine that can improve the performance while preventing the intake loss of the engine by variably cooling the air charged according to the load.

Description

Variable Cooling System of Turbocharged Engine

The present invention relates to a variable cooling system of a turbocharged engine. More specifically, the variable cooling of the supercharged air according to the speed and load of the engine can prevent the engine's suction loss and improve performance. It relates to a variable cooling system of a turbocharge engine.

Recently, the demand for automobiles has exploded due to the improvement of the national standard of living, but the cost of purchasing and maintaining automobiles has also increased since the Gulf crisis due to the increase of the automobile tax and the increase of oil prices. In addition to these factors, in particular, considering the poor road conditions and parking conditions in Korea, the long-term demand for automobiles in Korea is expected to be concentrated on small, high-powered light passenger cars. In response to this trend, some domestic automakers produced light passenger and vans equipped with small engines of 800cc class.In the early stages, they showed rapid growth in sales and market share. Recently, sales growth has slowed due to inconvenience. However, as one of the solutions to Korea's road conditions and urban parking problems, which are becoming more and more serious social problems, the government's active support for light passenger cars has been proposed. In light of the current domestic conditions and the cases of Europe and Japan, In the future, we believe that the supply of light passenger cars in Korea should expand even further.

In order to expand the supply of light vehicles, it is necessary to actively devise ways to satisfy the demands of consumers for low output due to low displacement through improvement of engine performance. As an active way to improve the output without increasing the displacement and engine speed, the multi-valve method and the turbocharge method are the first priority, and already in foreign countries, it is applied to small engines for light vehicles as well as medium and large engines. .

Turbocharge of automobile engines is reasonable in terms of utilizing exhaust loss energy, and can improve engine output without increasing displacement and engine speed, and in addition, it can balance high power, low fuel consumption, and compact weight. As a possible means, it is one of the useful measures to meet the demand for high performance of automotive engines.

As shown in FIG. 1, when the turbocharger 10 is installed to turbocharge the engine, when the exhaust turbine is turned on by the energy of the exhaust gas discharged from the engine, a compressor directly connected thereto pushes air into the engine. It is also called an exhaust turbine supercharger as a device for improving engine power. The turbocharger 20 has a configuration in which turbines having different angles are installed at both ends of one shaft, and one side of the housing is connected to the intake manifold via the intercooler 30, and the other side is connected to the exhaust manifold. As the exhaust gas is discharged from the exhaust stroke of the engine and the turbine on the exhaust side is rotated, the impeller on the intake side also rotates. The velocity energy of the air is converted into pressure energy and compressed and supplied to the cylinder, thereby improving volumetric efficiency and exhaust efficiency.

However, in the case of turbo-charging the engine in this way, unlike turbo-charging of a diesel engine, in a gasoline engine, high load knocking occurs due to a rise in temperature and pressure due to compression of the hop air, and an increase in heat load due to high temperature and high pressure. As the combustion pressure increases, the thermal load increase of engine parts becomes a serious problem.

Therefore, in the conventional turbocharged engine, as shown in FIG. 1, the intercooler 30 is provided between the turbocharger 20 and the intake manifold of the engine 10, and the air supercharged to the engine 10 is absorbed. It adopts a system that cools to an appropriate temperature.

However, in the conventional turbocharged engine cooling system, it is advantageous to cool the turbocharged air when the engine is heated at high speed, but it is advantageous to cool it when the engine is at low or medium speed. Since the cooling is made uniformly, there is a rather disadvantageous problem.

An object of the present invention is to solve the conventional problems as described above, by preventing the intake loss of the engine by improving the performance of the engine by varying cooling of the supercharged air according to the speed and load of the engine, It is to provide a variable cooling system of the turbocharged engine.

1 is a block diagram showing a cooling system of a conventional turbocharged engine.

2 is a block diagram showing a variable cooling system of a turbocharge engine according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: engine 20: turbocharger

30, 50: intercooler 40: bypass pipe

60, 70, 80: valve 90: control unit

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. Shall be.

2 is a block diagram showing a variable cooling system of a turbocharge engine according to an embodiment of the present invention. As shown in FIG. 2, the configuration of the variable cooling system of the turbocharge engine according to the embodiment of the present invention includes a bypass pipe 40 provided between the intake manifold of the engine 10 and the turbocharger 20. Is installed in parallel with the bypass pipe 40, the intercooler 50 for cooling the air input through the two flow paths, and the bypass valve 60 for opening and closing the bypass pipe 40 ), First and second flow path valves 70 and 80 for opening and closing the two flow paths of the intercooler 50, and the bypass valve 60 and the first and second flow path valves 70, respectively. , 80 consists of a control unit 90 for opening and closing according to the speed and load of the engine.

With the above configuration, the operation of the variable cooling system of the turbocharge engine according to the embodiment of the present invention is as follows.

When the power is applied, the control program programmed and stored in the internal memory of the controller 90 is executed by the controller 90 to start the operation of the variable cooling system of the turbocharge engine according to the embodiment of the present invention. When the operation is started, the controller 90 initializes all memory variables and then determines speed, load and temperature of the engine by using signals input from various sensors (not shown) including an engine speed sensor.

When the engine is at a low speed low load, the controller 90 closes the first and second flow path valves 70 and 80 and opens only the bypass valve 60 to cool the supercharged air supplied from the turbocharger 20. Without being supplied to the engine 10 through the bypass pipe (40).

When the engine is a medium speed heavy load, the control unit 90 closes the bypass valve 60 and the second flow path valve 80 and opens only the first flow path valve 70 to supply the supercharged air supplied from the turbocharger 20. Is supplied to the engine 10 while being properly cooled via the intercooler 50.

When the engine is at high speed and high load, the controller 90 closes the bypass valve 60 and opens the first and second flow path valves 70 and 80 so that the supercharged air supplied from the turbocharger 20 is intercooled. 50 is supplied to the engine 10 while being sufficiently cooled.

As described above, in the embodiment of the present invention, by varying the cooling of the supercharged air in accordance with the speed and load of the engine variable of the turbocharge engine having the effect of preventing the intake loss of the engine and at the same time improve the performance It is possible to provide a cooling system. Such effects of the present invention can be modified and used by those skilled in the art without departing from the gist of the present invention in the turbocharged engine field.

Claims (1)

The bypass pipe 40 provided between the intake manifold of the engine 10 and the turbocharger 20, and the air inputted through the two flow paths in parallel with the bypass pipe 40 described above. First and second flow paths for opening and closing the two flow paths of the intercooler 50 for cooling, the bypass valve 60 for opening and closing the bypass pipe 40, and the intercooler 50, respectively. And a control part 90 for opening and closing the valves 70 and 80 and the bypass valve 60 and the first and second flow path valves 70 and 80 according to the speed and load of the engine. Variable cooling system for turbocharged engines.