KR20030016839A - Air Intake and Exhaust system for automobile - Google Patents

Abstract

PURPOSE: An intake and exhaust system for a vehicle is provided to improve fuel efficiency by controlling an engine accurately and recirculating exhaust gas optimally with regulating the intake amount according to combustion condition, and to reduce exhaust gas by supplying mixed gas to an engine cylinder with mixing gas evenly. CONSTITUTION: An intake and exhaust system comprises an air tank(101) compressing, storing and supplying external air; an exhaust gas recirculation unit(110) connected to an exhaust manifold(108) of an engine cylinder head(107) to receive exhaust gas partially; a mixer(102) receiving and mixing compressed air and exhaust gas from the air tank and the exhaust gas recirculation unit; a first injector regulating the injection amount according to travel information and supplying compressed air to the mixer; a delivery pipe receiving mixed gas from the mixer; second injectors injecting mixed gas from the delivery pipe through cylinder ports; and a pressure regulating valve installed in the output end of the mixer to regulate pressure of mixed gas evenly. The intake and exhaust system is controlled accurately corresponding to travel condition or exhaust gas recirculation.

Description

Air Intake and Exhaust System for Automobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake and exhaust device of a vehicle, and more particularly, to an intake and exhaust device for a vehicle, which enables precise and intelligent control according to driving conditions and exhaust gas exhaust conditions of a vehicle.

As is well known, a vehicle intake and exhaust system is a system in which a mixer is sucked into an engine cylinder to operate an engine and exhausts gas burned in the cylinder to the outside. The output of the engine is adjusted according to the mixing ratio of the fuel mixer.

1 shows an example of a configuration of an intake and exhaust device of a vehicle equipped with a conventional diesel engine, and includes an air cleaner 1 and a turbocharger for forcibly inhaling air through the air cleaner 1. The intercooler (3) and the intercooler (3), which serve to increase the absolute amount of intake air supplied to the cylinder by increasing the density by cooling the compressed air of the high temperature pressurized by the air compressor (2), 3) the mixer 4 into which the air supplied from the air and the exhaust gas supplied through the EGR valve 9 are mixed, and the air sucked into the cylinder head 6 through the mixer 4 are reduced. Induced intake manifold (5), exhaust manifold (7) which collects and discharges the exhaust gas burned by the cylinder head (6), and forcibly sucks air from the exhaust manifold (7) and discharges it to the outside of the vehicle Turbocharger turbine 10 Cooled and then pulled a portion of the exhaust gas discharged from the exhaust manifold 7 is composed of EGR cooler 8 and the EGR valve 9 to be supplied to the mixer (4).

Accordingly, the air sucked by the air compressor 2 of the turbocharger passes through the air cleaner 1, the air compressor 2, the intercooler 3, the mixer 4, and the intake manifold 5, in turn. The exhaust gas which is supplied into the head 6 and burned to the cylinder head 6 through the exhaust manifold 7 is partially through the EGR cooler 8 and the EGR valve 9 which constitute the exhaust gas recirculation system. It is supplied to the mixer 4, and most of the remaining exhaust gas is discharged out of the vehicle through a muffler (not shown) and a catalytic converter (not shown).

For reference, the exhaust gas recirculation system draws a part of the exhaust gas from the exhaust passage, recycles it to the intake passage, mixes it with the intake air, and introduces it back into the combustion chamber to reburn the exhaust gas. It is a system to reduce the generation of NOx.

However, the above-described conventional intake and exhaust apparatus of automobiles has a drawback that it is difficult to precisely control the mixed gas sucked into the cylinder according to the driving conditions of the vehicle, and the emission of nitrogen oxides (NOx) by the EGR system is Although it can be reduced, there is a disadvantage of increasing PM, and when the exhaust gas ratio flowing into the mixer 4 through the EGR valve 9 is excessive, it inhibits combustion stability, releases hydrocarbons (HC), and lowers fuel economy. There were problems.

Accordingly, the present invention has been made to solve the above problems, by eliminating the heavy-weight mechanical components constituting the existing intake and exhaust device, the intake and exhaust device according to the running conditions and EGR rate of the vehicle by the electronic control method The purpose is to provide a vehicle intake and exhaust device for precise and intelligent control.

1 is a configuration diagram showing a configuration of a conventional intake and exhaust device of a vehicle

2 is a configuration diagram showing the configuration of the intake and exhaust device of a vehicle of the present invention

Explanation of Reference Symbols in Major Parts of Drawings

101-Air Tank 102-Mixer

103-First injector 104-Equalizing valve

105-delivery pipe 106-second injector

107-Engine Cylinder Head 108-Exhaust Manifold

110-exhaust recirculation unit 111-EGR cooler

112-EGR Valve 113-Map Sensor

ECU-Electronic Control Unit

In order to achieve the above object, the present invention, an air tank for compressing and storing the external air, an exhaust recirculation unit connected to the exhaust manifold of the engine cylinder head receives a portion of the exhaust gas, and the air tank And a mixer (Mixer) for receiving and mixing compressed air and exhaust gas from the exhaust recirculation unit and various driving information of the vehicle delivered to the electronic control unit (ECU) and controlling the compressed air compressed from the air tank. Each cylinder of the engine cylinder head is provided with a first injector for injecting and supplying the mixer, a delivery pipe supplied with the mixed gas from the mixer, and a mixed gas supplied to the delivery pipe under the control of the electronic control unit. A plurality of second injectors sprayed through the port and installed at the output of the mixer and supplied from the mixer to the delivery pipe; It provides a vehicle intake and exhaust device configured to include a pressure equalizing control valve that adjusts a constant pressure of the mixed gas.

According to an aspect of the present invention, the exhaust recirculation unit is connected to an exhaust manifold and an EGR cooler for cooling the introduced exhaust gas, and an exhaust gas provided to open and close a pipe between the EGR cooler and the mixer and supplied to the mixer. EGR valve for adjusting the, characterized in that consisting of a map sensor for sensing the information of the exhaust gas supplied to the mixer through the EGR valve and delivers to the electronic control unit (ECU).

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the vehicle intake and exhaust device according to the present invention will be described in detail.

2 is a configuration diagram for explaining the configuration and operation of the vehicle intake and exhaust device of the present invention, the intake and exhaust device of the present invention, the air tank 101 for compressing and storing the air introduced from the outside and the engine cylinder head 107 Connected to the exhaust manifold 108 of the exhaust gas recirculation unit 110 to receive a part of the exhaust gas, and compressed air and exhaust gas supplied from the air tank 101 and the exhaust recirculation unit 110 to be mixed. Mixer 102 is provided.

At the input end of the mixer 102, a first injector 103 is provided for injecting and supplying compressed air compressed from the air tank 101 into the mixer 102. The first injector 103 is an electronic control unit. According to various driving information of the vehicle transmitted to the ECU, for example, the coolant temperature measured by the water temperature sensor, the engine speed (rpm), the engine load measured by the accelerator track sensor, and the exhaust gas information collected by the exhaust recirculation unit. Its injection amount is to be controlled.

On the other hand, the engine cylinder head 107 is provided with a delivery pipe 105 which receives the mixed gas from the mixer 102, and the delivery pipe 105 is provided for the control of the electronic control unit (ECU). Thereby, a plurality of second injectors 106 are installed to inject the mixed gas therein through the respective cylinder ports of the engine cylinder head 107.

At the output end of the mixer 102, a pressure equalizing valve 104 is opened and closed according to the mixed gas pressure inside the mixer 102, and the delivery pipe 105 can always supply a uniform pressure of the mixed gas. The equalization control valve 104 is configured to supply a mixed gas of a constant pressure to the delivery pipe 105 at all times by discharging the mixed gas of the pressurized pressure through the discharge pipe when the mixed gas pressure exceeds the prescribed pressure.

On the other hand, the exhaust recirculation unit 110 is connected to the exhaust manifold 108, the EGR cooler 111 for cooling the introduced exhaust gas, and the pipe between the EGR cooler 111 and the mixer 102. EGR valve 112 is installed to open and close to control the exhaust gas supplied to the mixer 102, and the electronic control unit (ECU) by sensing the information of the exhaust gas supplied to the mixer 102 through the EGR valve 112 It consists of a map sensor 113 for transmitting to.

The intake and exhaust device of the present invention configured as described above operates as follows.

The compressed air from the air tank 101 is injected into the mixer 102 through the first injector 103, wherein the injection amount of the air injected into the mixer 102 is a water temperature sensor, an engine speed, an accelerator track sensor. Control by the electronic control unit (ECU) in accordance with various vehicle driving information.

If the EGR valve 112 is in an open state, the exhaust gas information detected by the map sensor 113 is also transmitted to the electronic control unit (ECU) to consider the amount of exhaust gas supplied into the mixer 102. Thus, air can be injected from the first injector 103.

Of course, since the exhaust gas is not supplied into the mixer 102 when the EGR valve 112 is closed (OFF), the electronic control unit (ECU) is based on the remaining driving information except for the exhaust gas information.

Subsequently, the mixed gas in the mixer 102 is supplied to the delivery pipe 105 at a constant pressure through the equalization control valve 104, and also by the control of the electronic control unit ECU according to various driving information, the second injector ( It is injected at a uniform pressure into each cylinder of the engine cylinder head 107 through 106 and combusted.

The gas burned in the engine cylinder head 107 is discharged through the exhaust manifold 108, and some of the exhaust gas is introduced into the exhaust recirculation unit 110 and then recycled to the mixer 102, and some of the exhaust gas is As it passes through a muffler (not shown) and a catalytic converter (not shown) is discharged to the outside through the discharge pipe.

As described above, according to the present invention, precise and intelligent engine control is possible by controlling the intake air amount according to the change of combustion conditions according to the opening and closing of the EGR valve of the exhaust gas recirculation system, and the optimum EGR rate can be maintained. The best combustion condition and fuel economy can be realized.

In addition, by appropriately adjusting the nitrogen oxides and PM according to the driving conditions such as the engine speed (rpm) and the engine load conditions, there is an effect that can easily respond to the exhaust gas regulations.

In addition, it is possible to actively cope with a desired driving state by performing a stable engine combustion by maintaining a uniformly mixed gas supplied to the engine cylinder and supplying it to each cylinder head cylinder, and by controlling all combustion situations electronically.

In addition, since the existing various heavy parts such as a turbocharger, an intercooler, and a suction manifold can be excluded, there is an effect that the weight of the vehicle can be achieved.

Claims (2)

An air tank for compressing and storing external air, an exhaust recirculation unit connected to an exhaust manifold of the engine cylinder head to receive a part of the exhaust gas, and supplying compressed air and exhaust gas from the air tank and the exhaust recirculation unit A first injector configured to receive and mix the first and second injectors for controlling the amount of injection according to various driving information of the vehicle transmitted to the electronic control unit (ECU), and for supplying the compressed air compressed from the air tank to the mixer; A delivery pipe supplied with the mixed gas, a plurality of second injectors for injecting the mixed gas supplied to the delivery pipe through the control of the electronic control unit through each cylinder port of the engine cylinder head, and the mixer Equalization control valve installed at the output stage to adjust the pressure of the mixed gas supplied from the mixer to the delivery pipe Vehicle intake and exhaust device configured to include. The exhaust gas recirculation unit of claim 1, wherein the exhaust recirculation unit is connected to an exhaust manifold to cool an exhaust gas introduced into the exhaust manifold, and the exhaust gas is supplied to the mixer to open and close a pipe between the EGR cooler and the mixer. And an EGR valve, and a map sensor which senses information of the exhaust gas supplied to the mixer through the EGR valve and transmits the information to the electronic control unit (ECU).