KR100490672B1 - Auxilary heating apparatus by collecting heat from exhaust gas of automobile engine - Google Patents

Abstract

The present invention relates to an auxiliary heating apparatus for low-emission automobile exhaust heat recovery. The hot water flowing into a heating core of a heat exchanger for heating in a vehicle is installed by installing a high-flow turbulent multi-tubular recirculation exhaust heat exchanger at the rear of the engine exhaust manifold. It relates to a low pollution automobile engine exhaust heat recovery auxiliary heating device for heating.

The present invention provides an exhaust gas heat exchanger having a plurality of exhaust gas flow pipes through which exhaust gas is distributed and a cooling water flow pipe formed through the exhaust gas flow pipes in an exhaust pipe connected to an exhaust manifold, and exhausting the exhaust gas heat exchanger. A first control valve is provided between the inlet of the gas flow pipe and the exhaust pipe to control the flow rate of the exhaust gas flowing into the exhaust gas flow pipe, and is exhausted between the outlet of the exhaust gas flow pipe of the exhaust gas heat exchanger and the intake manifold and the exhaust pipe. A second control valve for selectively controlling the gas passage and the flow rate is provided, and the inlet and the outlet of the cooling water flow pipe of the exhaust gas heat exchanger are connected to a cooling water pipe connecting the heater core of the heat exchanger for heating in the vehicle cabin, the cooling water flow pipe A third control valve is installed between the inlet and the cooling water pipe to control the flow rate. A fourth control valve is provided between the outlet of the coolant flow pipe and the input of the coolant pipe and the coolant water pump to selectively control the passage and the flow rate of the coolant.

Description

Auxilary heating apparatus by collecting heat from exhaust gas of automobile engine}

The present invention relates to an auxiliary heating apparatus for low-emission automobile exhaust heat recovery. The hot water flowing into a heating core of a heat exchanger for heating in a vehicle is installed by installing a high-flow turbulent multi-tubular recirculation exhaust heat exchanger at the rear of the engine exhaust manifold. It relates to a low pollution automobile engine exhaust heat recovery auxiliary heating device for heating.

Today, automobiles are developing direct injection methods such as gasoline direct injection (GDI) with high combustion efficiency for gasoline engines to cope with stringent emission regulations (ULEV, SULEV and EURO-IV, etc.) and diesel engines. In recent years, there is a trend to develop an advanced low pollution engine using DDI (Diesel Direct Injection) which is an ultra-high pressure direct injection method using a common rail.

  All of these advanced low-pollution engines maximize the fuel consumption efficiency, so the amount of heat emitted by the engine cooling water, which is the heating source of the car, is reduced by 30% to 40%, making it impossible to adequately heat the car interior in winter.

All conventional low pollution engine cars are not properly heated in the proper vehicle interior due to the rapid lack of heat source.

Therefore, in the case of a conventional low pollution engine vehicle, the interior temperature of the vehicle is lowered from 10 degrees Celsius to 15 degrees Celsius, and defrosting and proper cabin heating on the windshield for the driver's vision are impossible. .

 In addition, the heating problem of the cold weather of the car is a SUV car that is recently in increasing demand, the indoor space is wider, the above problems are more and more.

In addition, the heating device of the existing car is a hot water heating system that recycles the cooling water of the engine of the car. The device is very simple and easy to install, while the lack of a heat source prevents proper heating of the appropriate vehicle interior. .

Accordingly, the present invention has been made in view of the above-mentioned problems, and in particular, the exhaust gas heat exchanger is installed at the rear of the engine exhaust manifold to operate a heating device for heating the car interior, thereby sufficiently heating the car interior and starting the car. This is to make the engine warm up quickly.

In addition, the present invention is to provide an auxiliary heating apparatus for heating the vehicle interior and the engine by recovering the exhaust heat of the low pollution automobile engine.

In order to achieve the above object, the present invention provides an exhaust gas heat exchanger having a plurality of exhaust gas distribution pipes through which the exhaust gas is distributed and a cooling water distribution pipe formed through the exhaust gas distribution pipes, and installed in an exhaust pipe connected to the exhaust manifold. A first control valve is provided between the inlet of the exhaust gas flow pipe of the exhaust gas heat exchanger and the exhaust pipe to control the flow rate of the exhaust gas flowing into the exhaust gas flow pipe, and the outlet and the intake air of the exhaust gas flow pipe of the exhaust gas heat exchanger. A second control valve is provided between the manifold and the exhaust pipe to selectively control the exhaust gas passage and the flow rate, and the inlet and the outlet of the cooling water flow pipe of the exhaust gas heat exchanger are connected to the cooling water pipe connecting the heater core of the heat exchanger for heating in the automobile compartment. A flow rate between the inlet of the coolant flow pipe and the coolant pipe passage The install third control valve, and is made by installing a fourth control valve for selectively controlling the passage and flow rate of the cooling water between the cooling water outlet pipe and a coolant water pump input side of the cooling water flow pipe.

When described in detail with reference to Figures 1, 2, 3 attached to an embodiment of the present invention.

 1 is a circuit diagram showing a heat exchange system for heating a vehicle interior provided with the present invention, Figure 2 is a perspective view of a recirculating exhaust gas heat exchanger according to the present invention, Figure 3 is a cross-sectional view of the exhaust gas distribution pipe.

1, 2, and 3, the exhaust gas heat exchanger 10 is installed in addition to the existing engine cooling system and the vehicle interior heating apparatus.

The exhaust gas heat exchanger 10 includes a plurality of exhaust gas flow pipes 11 through which recycled exhaust gas is distributed, and a cooling water flow pipe 12 formed through the exhaust gas flow pipes.

The passage of the exhaust gas distribution pipe 11 is installed in the exhaust gas recirculation pipe 32 connecting the exhaust pipe 31 connected to the exhaust manifold 30 and the intake manifold 20. A first control valve 40 is installed between the exhaust gas recirculation pipe 32 and the exhaust pipe 31 to control the flow rate of the exhaust gas flowing into the exhaust gas flow pipe 11. A second control valve 50 for controlling the recycle exhaust gas to be selectively distributed to the intake manifold 20 and the exhaust pipe 31 at the outlet “C1” side of the exhaust gas flow pipe 11 of the recycle exhaust gas heat exchanger 10. Install it.

The cooling water flow pipe 12 of the exhaust gas heat exchanger 10 is installed between the cooling water outlet of the engine and the heater core for heating the thread. The inlet "B" and the outlet "B1" of the cooling water flow passage 12 are connected to a cooling water pipe connecting the engine 60 and the heater core 71 of the heat exchanger 70 for heating in the automobile compartment. The inlet "B" of the cooling water flow pipe 12 is connected to the engine 60 side and the outlet "B1" of the cooling water flow pipe 12 is connected to the heat exchanger 70 side for heating in the car compartment, and the cooling water flow pipe 12 The flow path of the coolant is selectively connected to the inlet of the coolant flow pipe 12 and the heater core 71 between the inlet of the coolant and the cooling water pipe connecting the engine 60 and the heater core 71 of the heat exchanger 70 for heating the vehicle interior. A third control valve 80 to control the cooling water pipe 12; and an outlet of the cooling water flow pipe 12, and a cooling water pipe connecting the engine 60 and the heater core 71 of the heat exchanger 70 for heating the vehicle interior. A fourth control valve 90 for selectively controlling the input of the coolant water pump 120 is installed. Although it is shown in Figure 1 to be returned to the coolant storage tank 100 at the outlet of the coolant flow pipe 12, it may be directly connected to the input side of the water pump.

As shown in Figs. 2 and 3, the exhaust gas flow pipe is preferably formed of a bent pipe that maximizes the contact area with the exhaust gas passing through the inside and the coolant outside. The exhaust gas flow pipe shown in FIG. 2 increases the surface area to increase the contact area with the cooling water. Another embodiment of the exhaust gas distribution pipe shown in Figure 3 is a highly turbulent flow type tube designed to be spiral. Therefore, the exhaust gas passing through the exhaust gas distribution pipe 11 can transfer its heat to the cooling water in the cooling water distribution tube 12 through the exhaust gas distribution pipe 11 as much as possible.

The first control valve 40, the second control valve 50, the third control valve 80, the fourth control valve 90 is used that the passage and the flow rate is automatically controlled by an electronic control unit (not shown) Do it.

When described in detail with reference to Figures 1, 2, 3 attached to the correct operating state of the present invention configured as described above.

When the vehicle is started, the air introduced through the intake manifold 20 and the fuel introduced into the engine 60 are combusted to generate a high-temperature combustion gas (hereinafter referred to as exhaust gas). It is discharged to the outside through the fold 30 and the exhaust pipe 31, or a part is introduced into the intake manifold 20 again through the exhaust gas recirculation pipe 32 in which the recirculation exhaust gas heat exchanger 10 is installed, together with the fuel. It enters and burns into the engine 60.

On the other hand, the coolant is circulated by the water pump 120, the coolant flows into the engine 60 receives the heat from the engine 60, cooled in the radiator 110, and then is introduced into the water pump again.

When the engine is warmed and the coolant is heated to a certain temperature, the engine is introduced into a heat exchanger 70 for heating in the car compartment to warm the air in the heat exchanger 70 for heating in the car interior and sent to the inside of the car by using a blower fan 72. Heating.

In addition, the coolant passing through the engine 60 flows into the recycle exhaust gas heat exchanger 10 and is heated again by the high temperature recycle exhaust gas and flows into the vehicle heat exchanger 70.

This is explained in more detail as follows.

Looking at the flow of the exhaust gas first, the exhaust gas generated by the combustion of air and fuel introduced through the intake manifold 20 is discharged to the outside through the exhaust manifold 30 and the exhaust pipe 31, and some exhaust gas. After passing through the exhaust gas recirculation pipe 32 and the exhaust gas distribution pipe 11 of the recirculating exhaust gas heat exchanger 10 through the first control valve 40, the intake air is controlled by the second control valve 50. It is introduced into the engine 60 through the manifold 20 or is reintroduced into the exhaust pipe 31 and discharged to the outside.

In addition, the flow of the coolant refers to the coolant passage formed in the cylinder block of the engine 60 and the cylinder head of the coolant of the radiator 110 installed with the coolant storage tank 100 or the cooling fan 111 by the operation of the coolant water pump 120. The engine 60 heated by the combustion heat of the fuel is cooled while rotating the respective parts of the engine 60 through (not shown). Thereafter, the engine 60 is cooled and flows directly into the heater core 71 of the vehicle heat exchanger 70 through the coolant third control valve 80 heated to a predetermined temperature to heat the heat exchanger 70 for the vehicle interior. The outside air in the inside) is heated, and then the inside of the room is heated to an appropriate temperature by blowing the heated outside air into the vehicle interior with the blowing fan 72.

At this time, after passing through the respective parts of the engine 60, the cooling water of a predetermined temperature introduced into the heater core 71 of the heat exchanger 70 for heating the vehicle interior immediately after passing through the third control valve 80 to heat the outside air If the heat quantity or temperature sufficient to heat the room to an appropriate temperature is low (initial startup and cold weather), the cooling water passed to each part of the engine 60 and heated to a predetermined temperature is controlled by the third control valve 80. Receive heat from the recycled exhaust gas flowing into the coolant flow pipe 12 of the furnace exhaust gas heat exchanger 10 and passing through the plurality of exhaust gas flow pipes 11 penetrated into the coolant flow pipe 12 in a thermally conductive manner. After the secondary heating, the air flow is introduced into the heater core 71 of the heat exchanger 70 for heating in the vehicle interior through the fourth control valve 90 and the cooling water pipe. Heated to.

The outside air in the heated vehicle heat exchanger 70 is introduced into the vehicle interior by the operation of the blower fan 72, thereby heating the vehicle interior.

As described above, the cooling water cooled to a predetermined temperature or lower by heating the vehicle interior, that is, the cooling water passing through the heater core 71 is introduced into the engine 60 through the cooling water water pump 120. When the heater core is not used, the coolant heated secondly through the coolant flow pipe 12 is directly introduced into the coolant storage tank 100 under the control of the fourth control valve 90 to cool the water pump 120. By flowing into the engine 60 through, the engine 60 is warmed up quickly.

When no warming up of the car or heating is required, the control valves can be controlled to disable the exhaust gas heat exchanger.

All control valves 40, 50, 80 and 90 are automatically controlled by an electronic control unit provided in the vehicle. That is, it is appropriately controlled in accordance with the set value (in-vehicle temperature, cooling water temperature, combustion rate, etc.) set in the electronic control unit.

As described above, according to the present invention, by installing an exhaust gas heat exchanger using heat of exhaust gas in an exhaust gas recirculation pipe, the cooling water used in a heat exchanger for heating in an automobile compartment can be heated to an appropriate temperature required for heating in a short time. It is effective to make the heating inside the car comfortable even in cold weather.

In addition, the warm-up of the engine is performed at a fast time when the vehicle is started, and thus, the fuel is completely burned within a short time, thereby reducing the air pollution caused by the exhaust gas.

In addition, there is an effect that can improve the regeneration rate of the heat of combustion emitted to the outside due to the exhaust gas.

1 is a circuit diagram showing a heat exchange system for heating a car interior provided with the present invention.

2 is a perspective view of a recycle exhaust gas heat exchanger according to the present invention;

3 is a sectional view of a heat exchanger exhaust gas distribution pipe;

*** Explanation of symbols for main parts of drawing ***

10: recirculating exhaust gas heat exchanger 11: exhaust gas distribution pipe

12: cooling water distribution pipe 20: intake manifold

30 exhaust exhaust manifold 31 exhaust pipe

32: exhaust gas recirculation pipe 40: first control valve (CONTROL VALVE)

50: second control valve 60: engine

70: heat exchanger for heating in the car interior 71: heater core (HEATER CORE)

72: blower fan 80: third control valve

90: fourth control valve

Claims (2)

An exhaust gas heat exchanger having a plurality of exhaust gas distribution pipes through which the exhaust gas is distributed and a cooling water distribution pipe formed through the exhaust gas distribution pipes is installed in the exhaust pipe connected to the exhaust manifold, A first control valve is installed between the inlet of the exhaust gas flow pipe of the exhaust gas heat exchanger and the exhaust pipe to control the flow rate of the exhaust gas flowing into the exhaust gas flow pipe. A second control valve for selectively controlling the exhaust gas passage and the flow rate between the outlet of the exhaust gas flow pipe of the exhaust gas heat exchanger and the intake manifold and the exhaust pipe of the engine, An inlet and an outlet of the cooling water flow pipe of the exhaust gas heat exchanger are connected to a cooling water pipe line connecting the heater core of the heat exchanger for heating in the car, and a third control valve is installed between the inlet and the cooling water pipe path of the cooling water flow pipe. And a fourth control valve for selectively controlling the passage and the flow rate of the cooling water between the outlet of the cooling water flow pipe and the cooling water pipe and the input of the cooling water water pump. The method of claim 1, The exhaust gas distribution pipe is a low pollution automobile engine exhaust heat recovery auxiliary heating device, characterized in that formed in the bent pipe is repeated a constant curvature in the longitudinal direction.