CN104564434B - A kind of EGR engine assembly - Google Patents

Abstract

The invention provides an EGR engine assembly, which includes a crankcase, a cylinder head located at the upper and lower ends of the crankcase, an oil pan and an EGR cooler assembly located at the exhaust side of the engine, the EGR cooler assembly and the engine exhaust The pipes are matched accordingly, and the EGR cooler assembly is equipped with an EGR control valve. The EGR control valve can accurately control the flow of exhaust gas entering the EGR cooler assembly, so as to accurately control the EGR rate of the engine. The two ends of the EGR cooler assembly are respectively connected with an EGR inlet pipe and an EGR return pipe, and the two form a cooling circulation system to cool the exhaust gas in the exhaust pipe. The exhaust pipe of the engine is connected to the EGR intake pipe, and the EGR intake pipe is connected to the intercooled intake pipe connected with the combustion chamber. The cooled exhaust gas enters the combustion chamber, which reduces the oxygen concentration and the maximum combustion temperature in the cylinder, and reduces the Generation of harmful gas _NOx .

Description

A kind of EGR engine assembly

technical field

The invention relates to an EGR engine assembly, which belongs to the technical field of auto parts.

Background technique

In order to prevent air pollution and meet the emissions of nitrogen oxides (NO _x ) in automobile exhaust gas specified in the emission regulations, effective measures must be taken to reduce the combustion peak temperature, shorten the duration of high temperature, and adopt an appropriate air-fuel ratio to Reduce _NOx emissions. At present, exhaust gas recirculation technology (EGR) is generally used in automobiles to achieve the above purpose. This technology can reduce the oxygen concentration and maximum combustion temperature in the cylinder to control the generation of harmful gas NO _X and achieve the purpose of reducing emissions.

However, in the current EGR structure used in automobiles, only the exhaust gas is reintroduced into the combustion chamber for secondary combustion, and the exhaust gas flow into the combustion chamber cannot be accurately controlled, so that the EGR rate cannot be accurately controlled. Matched cooling structure, the effect of reducing the oxygen concentration and the maximum combustion temperature in the cylinder is not obvious, so the effect of controlling the generation of harmful gas NO _x and reducing emissions is not ideal, which is one of the shortcomings of the existing technology place.

Contents of the invention

The technical problem to be solved by the present invention is to provide an EGR engine assembly aimed at the deficiencies in the prior art, which can accurately control the flow of exhaust gas entering the EGR cooler assembly, and can effectively control harmful gases NOX generation and emission.

This program is realized through the following technical measures: the EGR engine assembly includes a crankcase, a cylinder head located at the upper and lower ends of the crankcase, an oil pan and an EGR cooler assembly located at the exhaust side of the engine, and the crankcase is equipped with Engine oil module, starter, air compressor, high-pressure oil pump, fuel supply pump and fuel module, EGR cooler assembly and engine exhaust pipe match correspondingly, and the two ends of EGR cooler assembly are respectively connected with EGR water inlet pipe and EGR return water pipe , the exhaust pipe of the engine is connected to the EGR intake pipe, the EGR intake pipe is connected to the intercooled rear intake pipe connected with the combustion chamber, the EGR cooler assembly is equipped with an EGR control valve, and the EGR control valve is a pneumatic control valve. The electromagnetic valve and position sensor are integrated, and the opening of the EGR control valve is fed back to the electronic control unit ECU, so that the EGR control valve can accurately control the flow of exhaust gas entering the EGR cooler assembly, so as to accurately control the EGR rate of the engine.

The exhaust side of the above-mentioned engine is also equipped with a supercharger, which realizes the supercharging of the engine, effectively improves the performance of the engine, and reduces the emission of harmful gas _NOx .

The above-mentioned engine oil module and starter are located on the exhaust side of the engine, and the air compressor, high-pressure oil pump, fuel supply pump and fuel module are located on the intake side of the engine. This arrangement can effectively utilize the space in the engine.

The above-mentioned engine oil module includes an engine oil filter, an oil-air separator, an engine oil cooler and a pressure limiting valve, and the fuel module includes a fuel fine filter and a hand oil pump. This integrated modular structure has a compact structure, minimizes the use of sealing elements, and reduces the number of parts by about 25% compared with conventional diesel engines, thereby effectively reducing the risk of leakage and facilitating maintenance.

A cylinder head cover is installed above the cylinder head, and the cylinder head cover is a nylon cylinder head cover, which is beneficial to marking the manufacturer's logo on the cylinder head cover.

The above-mentioned oil pan is a composite steel plate structure to reduce the noise of the engine working.

The end of the above-mentioned engine is equipped with a water pump, a generator and a fan, and the three assist the engine to maintain better performance.

The crankcase above is made of vermicular graphite cast iron, which reduces the weight of the cylinder while increasing the strength.

The beneficial effect of this scheme can be known according to the description of the above scheme. In the EGR engine assembly, an EGR control valve is installed on the EGR cooler assembly. The EGR control valve adopts a pneumatic control valve, and the electromagnetic valve and position The sensor feeds back the opening of the EGR control valve to the electronic control unit ECU, so that the EGR control valve can accurately control the flow of exhaust gas entering the EGR cooler assembly, so as to accurately control the EGR rate of the engine. The two ends of the EGR cooler assembly are respectively connected to the EGR inlet pipe and the EGR return pipe. The EGR inlet pipe leads the cooling water into the EGR cooler assembly, and the cooling water flows back to the thermostat housing from the EGR return pipe, forming an EGR system. The advanced cooling circulation system cools the exhaust gas in the exhaust pipe. The exhaust pipe of the engine is connected to the EGR intake pipe, and the EGR intake pipe is connected to the intercooled rear intake pipe connected with the combustion chamber. The EGR intake pipe leads the cooled exhaust gas into the intercooled rear intake pipe, and enters the Combustion chamber, that is, the exhaust gas in the exhaust pipe is cooled by the EGR cooler assembly and mixed with the air in the intake pipe after intercooling before entering the cylinder, so as to reduce the oxygen concentration and maximum combustion temperature in the cylinder to control harmful gas NO _X generation, to achieve the purpose of reducing emissions. The engine assembly has compact structure, high reliability and performance, can effectively reduce the _NOx emission of the engine, and reach the emission level of Euro V standard. It can be seen that, compared with the prior art, the present invention has outstanding substantive features and remarkable progress, and the beneficial effects of its implementation are also obvious.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a specific embodiment of the present invention.

Fig. 2 is a second perspective structural diagram of a specific embodiment of the present invention.

In the figure, 1-EGR water inlet pipe, 2-cylinder head cover, 3-air compressor intake pipe, 4-wire harness cover, 5-flywheel housing, 6-air compressor, 7-EGR cooler assembly, 8-EGR Air intake pipe, 9-intercooler rear intake pipe, 10-EGR return pipe, 11-oil module, 12-crankcase, 13-fuel module, 14-fuel pump, 15-high pressure oil pump, 16-generator, 17-oil Bottom case, 18-fan, 19-engine outlet pipe, 20-starter, 21-supercharger, 22-water pump.

Detailed ways

In order to clearly illustrate the technical characteristics of this solution, the following will describe this solution through specific implementation modes and in conjunction with the accompanying drawings.

A kind of EGR engine assembly, it comprises the crankcase 12 of vermicular graphite cast iron material, the cylinder head that is positioned at crankcase 12 upper and lower ends and oil pan 17 and the EGR cooler assembly 7 that is positioned at engine exhaust side and supercharger 21 . The crankcase 12 is equipped with an oil module 11, a starter 20, an air compressor 6, a high-pressure oil pump 15, an oil supply pump 14 and a fuel module 13, wherein the oil module 11 and the starter 20 are located on the exhaust side of the engine, and the air compressor 6. The high pressure oil pump 15, fuel supply pump 14 and fuel module 13 are located on the intake side of the engine. The engine oil module 11 and the fuel module 13 respectively adopt a modular structure: the engine oil module 11 includes an oil filter, an oil-air separator, an oil cooler and a pressure limiting valve, and the fuel module 13 includes a fuel fine filter and a hand oil pump.

The EGR cooler assembly 7 is matched with the exhaust pipe of the engine. The EGR cooler assembly 7 is equipped with an EGR control valve. The exhaust pipe of the exhaust pipe is connected with an EGR intake pipe 8, and the EGR intake pipe 8 is connected with an intercooled rear intake pipe 9 communicated with the combustion chamber. The EGR control valve adopts a pneumatic control valve, which is integrated with electronic control and position feedback. Through the EGR control valve, the exhaust gas flow into the EGR cooler assembly 7 can be accurately controlled to accurately control the EGR rate of the engine. The EGR water inlet pipe 1 introduces the cooling water into the EGR cooler assembly 7, and the cooling water flows back to the thermostat housing from the EGR return pipe 10, forming a cooling circulation system of the EGR system to cool the exhaust gas in the exhaust pipe. The EGR intake connection pipe 8 introduces the cooled exhaust gas into the intercooled intake pipe 9, and enters the combustion chamber through the intercooled intake pipe 9, that is, the exhaust gas in the exhaust pipe is cooled by the EGR cooler assembly 7 and connected with the intercooled intake pipe 9 The air in the cylinder is mixed and enters the cylinder, so that the oxygen concentration and the maximum combustion temperature in the cylinder are reduced, so as to control the generation of harmful gas NO _X and achieve the purpose of reducing emissions.

A cylinder head cover 2 is installed above the cylinder head, and the cylinder head cover 2 is a nylon cylinder head cover, which can conveniently mark the manufacturer's logo on the top surface of the cylinder head cover 2; A composite steel plate structure is used to reduce the noise when the engine is working. In addition, a water pump 22, a generator 16 and a fan 18 are installed at the end of the engine, through which the engine maintains better performance.

The technical features not described in the present invention can be realized by existing technologies, and will not be repeated here. The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above-mentioned specific implementation, and changes, modifications, additions or replacements made by those of ordinary skill in the art within the essential scope of the present invention should also belong to protection scope of the present invention.

Claims (10)

1. a kind of EGR engine assembly, it includes crankcase and the cylinder cap and oil sump positioned at crankcase upper and lower ends, crankcase Upper assembling organic oil module, starter, air compressor machine, high-pressure oil pump, oil feed pump and fuel oil module, it is characterised in that：Further include position In the cooler for recycled exhaust gas assembly (7) of the exhaust side of engine, cooler for recycled exhaust gas assembly（7）It is cold with exhaust pipe of engine corresponding matching, EGR But the both ends of device assembly are connected to EGR water inlet pipes (1) and EGR return pipes (10), waste pipe be connected with EGR into Gas takes over (8), EGR air inlet tubes are connected with communicated with combustion chamber in it is cold after air inlet pipe (9), on the cooler for recycled exhaust gas assembly EGR control valve is installed, EGR control valve uses pneumatic control valve, is integrated with solenoid valve and position sensor above, EGR is controlled The open degree feedback electron control unit ECU of valve processed, allows EGR control valve accurately to control into the useless of cooler for recycled exhaust gas assembly Throughput, accurately to control the EGR rate of engine.

2. EGR engine assembly according to claim 1, it is characterized in that：The exhaust side of the engine is also equipped with increasing Depressor.

3. EGR engine assembly according to claim 1 or 2, it is characterized in that：The machine oil module and starter are positioned at hair The exhaust side of motivation.

4. EGR engine assembly according to claim 3, it is characterized in that：The air compressor machine, high-pressure oil pump, oil feed pump and Fuel oil module is located at the air inlet side of engine.

5. EGR engine assembly according to claim 1 or 2, it is characterized in that：The machine oil module includes oil filtration Device, gs-oil separator, oil cooler and pressure limiting valve.

6. EGR engine assembly according to claim 1 or 2, it is characterized in that：The fuel oil module includes secondary fuel oil filter And hand oil pump.

7. EGR engine assembly according to claim 1 or 2, it is characterized in that：Cylinder head cover is installed above the cylinder cap, The cylinder head cover is nylon matter cylinder head cover.

8. EGR engine assembly according to claim 1 or 2, it is characterized in that：The oil sump is clad steel plate structure.

9. EGR engine assembly according to claim 1 or 2, it is characterized in that：The end of the engine is provided with water Pump, generator and fan.

10. EGR engine assembly according to claim 1 or 2, it is characterized in that：The crankcase is vermicular cast iron material Crankcase.