CN201891532U - EGR (exhaust gas recirculation) air inlet control system of light diesel engine - Google Patents

EGR (exhaust gas recirculation) air inlet control system of light diesel engine Download PDF

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Publication number
CN201891532U
CN201891532U CN2010205397081U CN201020539708U CN201891532U CN 201891532 U CN201891532 U CN 201891532U CN 2010205397081 U CN2010205397081 U CN 2010205397081U CN 201020539708 U CN201020539708 U CN 201020539708U CN 201891532 U CN201891532 U CN 201891532U
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CN
China
Prior art keywords
air inlet
egr
tail gas
fresh air
valve
Prior art date
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CN2010205397081U
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Chinese (zh)
Inventor
庞威
赵贵
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广西玉柴机器股份有限公司
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Priority to CN2010205397081U priority Critical patent/CN201891532U/en
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Publication of CN201891532U publication Critical patent/CN201891532U/en

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    • Y02T10/121
    • Y02T10/146

Abstract

The utility model discloses an EGR (exhaust gas recirculation) air inlet control system of a light diesel engine, which comprises an air inlet connecting pipe communicated with a fresh air source. An air inlet throttling valve is arranged at an air inlet end of the air inlet connecting pipe and used for controlling the total air inlet volume of fresh air; the air inlet connecting pipe is in a double-layer structure; a lower layer of the air inlet connecting pipe is communicated with a first pressure stabilizing cavity of an air inlet pipe and controls fresh air flowing into the first pressure stabilizing cavity by the aid of an air inlet swirl control valve, so that a fresh air inlet group is formed; an EGR gas inlet is arranged at the root position of an upper layer of the air inlet connecting pipe; cooled tail gas flow entering the EGR gas inlet is controlled by the aid of an electric control EGR valve; tail gas is mixed with the fresh air in the upper layer of the air inlet connecting pipe; and the tail gas and the fresh air which are mixed sufficiently enter a second pressure stabilizing cavity of the air inlet pipe, so that a tail gas inlet group with EGR is formed. The system is capable of not only realizing gain of controllable high EGR rate at low and medium speeds, but also ensuring inflating efficiency of a high-speed section.

Description

LD-diesel EGR air intake control system

Technical field

The utility model relates to the diesel engine field, the air intake control system of particularly a kind of LD-diesel band EGR.

Background technique

The waste gas that diesel engine is burnt in the course of the work contains harmful gases such as NOx, and therefore country has clearly stipulated the NOx content in the motor exhaust in environmental regulation.Along with the standard promulgation of state three, state four, state five, NOx content limit value is more and more stricter.This just needs motor to take into full account the control of this limit value when design and burning exploitation, should satisfy the emission regulation demands of country, can take into account the performance requirement of motor again.

The formation mechanism three elements of NOx in the tail gas are high temperature, oxygen enrichment, firing duration.Promptly under the condition of enough oxygen concentrations, temperature is high more and combustion reaction time is long more, and then growing amount is big more.By egr system (Exhaust Gas Recycle, i.e. gas recirculation system), introduce the benefit that suction tude can obtain three aspects after the waste gas cooling with motor again: the thermal capacity that one, improves mixed gas.Also have water vapor and carbon dioxide in the waste gas, can effectively reduce the maximum combustion temperature in the cylinder, suppress the generation of NOx.Two, reduce concentration of oxygen in the mixed gas.The diluting effect that waste gas adds can make the relative concentration of oxygen descend, thereby also can reduce the discharging of NOx.Three, reduce velocity of combustion.Owing to contain a large amount of inert gases in the waste gas,, combustion velocity slowed down when these waste gas partial reflux have played the effect of diluting new charge after suction tude.

Country's Abgasgesetz is controlled the middle low speed section of section in the motor operation to the examination of Light-duty Vehicle NOx discharging, and the examination control section of centering, heavy goods vehicles NOx discharging is at the high-speed overload lotus section of motor operation.

In order to satisfy the examination requirement of rules, according to burning and exhausting control NOx mechanism, introduced the notion that EGR leads, promptly the shared percentage of backflow tail gas recently improves burning in the control cylinder.LD-diesel need lead up to the EGR more than 50% when middle low speed segment could effectively control the NOx discharging; And in high regime in order to reduce pumping loss, satisfy low rate of fuel consumption requirement, EGR leads and does not need so big.In fact just to catch up with the demand of stating opposite for the working principle of LD-diesel: during middle low speed, it is few to produce waste gas, is difficult to obtain higher exhaust back pressure backflow tail gas and guarantees that high EGR leads; During high speed, it is many to produce waste gas, but needs smooth and easy exhaust this moment again, and the more fresh air of inspiration participates in burning, and so big EGR has not led.The egr system of existing LD-diesel is at fixing booster turbine, fixing outlet pipe internal diameter, only depends on the aperture control exhaust gas flow of EGR valve before the suction tude, and low speed segment is controlled and obtained the performance requirement that desirable EGR led and can take into account high regime in being difficult in.

Tradition band EGR gas handling system scheme shortcoming:

1) reduces booster turbine, pressure is increased improve EGR to lead the too small Economy at a high speed of having sacrificed of turbine.

2) method that reduces the outlet pipe internal diameter increases exhaust pressure, and this method only leads beneficial to the EGR of high regime high load working condition, little to little load low speed segment influence, so having little significance to Light-duty Vehicle.

3) variation at IC Intake Valve Closes angle is difficult to the EGR that realization improves in the cylinder significantly and leads.

4) valve overlap reduces, and EGR leads and can increase to some extent, can't significantly improve but EGR leads critical value of existence.

The model utility content

The utility model is in order to overcome defective in the above-mentioned prior art, both can be implemented in the controlled high EGR of middle low speed acquisition and to have led, can guarantee the charging efficiency of high regime again, farthest reducing the influence that pressurized machine and outlet pipe lead EGR.

LD-diesel EGR air intake control system of the present utility model comprises the air inlet tube that is communicated with fresh air sources, and the inlet end of air inlet tube is established intake-air throttle valve, is used to control the air inlet total amount of fresh air; Air inlet tube is a double layer construction, and wherein air inlet tube lower floor is communicated with suction tude first pressure stabilizing cavity and controls the fresh air flow that flows into first pressure stabilizing cavity by the intake swirl control valve, forms the FAI Fresh Air Intake group; Root place, air inlet tube upper strata establishes the EGR suction port, the exhaust flow that enters the EGR suction port is controlled by the electric control EGR valve through cooled tail gas, tail gas mixes on the air inlet tube upper strata with fresh air, abundant mixed tail gas and fresh air enter suction tude second pressure stabilizing cavity, form band EGR tail gas air inlet group.

Wherein, the air inlet tube upper strata is communicated with suction tude second pressure stabilizing cavity by the second pressure stabilizing cavity bronchus, is used for fully mixing tail gas and the fresh air that is positioned at the air inlet tube upper strata.

Wherein this system also comprises cooler for recycled exhaust gas and EGR conduit, and tail gas cools off in cooler for recycled exhaust gas, enters air inlet tube by the EGR conduit then.

Wherein, LD-diesel is four cylinders, 16 valve diesel, the FAI Fresh Air Intake group comprises first and third, five, seven suction ports, and band EGR tail gas air inlet group comprises second, four, six, eight suction ports, and fresh air inlet is provided with at interval with band EGR tail gas suction port.

Wherein, intake-air throttle valve, intake swirl control valve and electric control EGR valve can carry out the automatically controlled control of ECU, are exceeding under the prerequisite that lowers engine performance, can satisfy the emission limit of country again; When diesel engine during at middle low-speed running, the valve of the valve of intake-air throttle valve and intake swirl control valve turns down, and the valve of electric control EGR valve is opened to maximum, is used to introduce enough tail gas and guarantees the air inlet charging efficiency of band EGR tail gas air inlet group; When diesel engine when running up, the valve of the valve of intake-air throttle valve and intake swirl control valve is opened greatly, the valve of electric control EGR valve suitably turns down, and is used to guarantee the charging efficiency of the FAI Fresh Air Intake of two air inlet groups.

Compared with prior art, the utlity model has following beneficial effect:

1, by the double layer design of air inlet tube and the setting of three respective valves, can under different operating modes, accurately control EGR and lead;

2, the compact structure of system, be convenient to implement, the big EGR that can satisfy the light-duty diesel engine middle and slow speed of revolution leads requirement;

3, system failure rate is low, safe and reliable, can satisfy stricter emission request after the optimization and upgrading.

Description of drawings

Fig. 1 is the three-dimensional assembling exploded view of the air intake control system of the utility model diesel engine band EGR;

Fig. 2 is the stereogram after the air intake control system of the utility model diesel engine band EGR is assembled;

Fig. 3 is the stereogram (showing eight suction ports) after the air intake control system of the utility model diesel engine band EGR is assembled;

Fig. 4 is the oil gas flow schematic diagram (showing the valve location of the double layer construction of air inlet tube and intake-air throttle valve, intake swirl control valve) in the air intake control system of the utility model diesel engine band EGR;

Fig. 5 is the turnover air-flow schematic representation of the three-dimensional assembling of air intake control system of diesel engine band EGR of the present invention.

Mark the following drawings mark thereon in conjunction with the accompanying drawings:

The 1-suction tude; The 2-intake-air throttle valve; The 3-EGR conduit; 4-intake swirl control valve; The 5-air inlet tube; 6-electric control EGR valve; The 7-EGR cooler; 8-suction tude first pressure stabilizing cavity; The 9-first pressure stabilizing cavity intake manifold; The 10-second pressure stabilizing cavity intake manifold; 11-suction tude second pressure stabilizing cavity; The 12-second pressure stabilizing cavity bronchus; 13-first suction port; 14-second suction port; 15-the 3rd suction port; 16-the 4th suction port; 17-the 5th suction port; 18-the 6th suction port; 19-the 7th suction port; 20-the 8th suction port; 21-intake-air throttle valve valve; 22-air inlet tube shunting chamber; The 23-EGR suction port; 24-intake swirl control valve valve; The 25-fresh air inlet; 26-exhaust exhaust gas inlet.

Embodiment

Below in conjunction with accompanying drawing, an embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model is not subjected to the restriction of embodiment.

As shown in Figure 1, the air intake control system of whole diesel engine band EGR is made up of seven most of component: i.e. suction tude 1, intake-air throttle valve 2, EGR conduit 3, intake swirl control valve 4, air inlet tube 5, electric control EGR valve 6, cooler for recycled exhaust gas 7.

Further as shown in Figure 2, suction tude is divided double-layer structure, and suction tude first pressure stabilizing cavity 8 is equipped with intake swirl control valve 4 down at its front end; Suction tude second pressure stabilizing cavity 11 is last, and is connected with the long second pressure stabilizing cavity bronchus 12.Tail gas imports air inlet tube 5 through EGR conduit 3 after electric control EGR valve 6 and cooler for recycled exhaust gas 7 control flow rate and cooling.

Further shown in Fig. 2,3, suction tude second pressure stabilizing cavity 11 links to each other with second suction port 14, the 4th suction port 16, the 6th suction port 18, the 8th suction port 20, and this group suction port is called band EGR tail gas air inlet group; Suction tude first pressure stabilizing cavity 8 links to each other with first suction port 13, the 3rd suction port 15, the 5th suction port 17, the 7th suction port 19, and this group suction port is called the FAI Fresh Air Intake group.

Introduce the working principle and the working procedure of the utility model system below in detail:

System of the present utility model sets up on the basis of the diesel engine of four cylinders, 16 valves: have in the diesel engine of two intake valves at each cylinder, suction tude is divided into two groups, and first group is mixed with EGR tail gas, and second group of band valve do not mix with EGR tail gas.When middle low speed operating mode, the electric control EGR valve is opened to maximum, by controlling second group valve and air inlet restriction valve, can make first group to obtain very high EGR and lead; And when high-speed working condition, control electric control EGR valve suitably cuts out, and second group valve and air inlet restriction valve are opened simultaneously, have guaranteed that enough fresh airs enter.

Further as shown in Figure 4, system of the present utility model has three valves to regulate: the electric control EGR valve 6 (not shown among Fig. 4, as to see Fig. 1,2) of promptly controlling EGR tail gas amount; The control fresh air enters the valve 21 of the intake-air throttle valve of total amount; Control the intake swirl control valve 4 (corresponding valve is the valve 24 among Fig. 4) of one group of suction tude air inflow.

During at middle low speed, motor is few to the fresh air gross demand in diesel engine work, and intake-air throttle valve valve 21 can turn down; This moment, the tail gas production was little, electric control EGR valve 2 can be opened to maximum to introduce enough tail gas; Intake swirl control valve valve 24 turns down, and guarantees the pressure of EGR tail gas and fresh air combined group suction tude, guarantees the charging efficiency of air inlet.

During in high speed, motor is a lot of to the fresh air gross demand in diesel engine work, and intake-air throttle valve valve 21 can strengthen; This moment, the tail gas production was very big, thereby electric control EGR valve 2 suitably can cut out the tail gas that control EGR introduces; Intake swirl control valve valve 24 standard-sized sheets guarantee that two groups of suction tude all have enough fresh airs, have guaranteed the charging efficiency of air inlet.

The air inlet FLOW CONTROL further as shown in Figure 4, the utility model core texture is that the air inlet tube shunting chamber 22 of air inlet tube 5 has been divided into two strands with fresh air, first strand enters 12, the second strands in the second pressure stabilizing cavity bronchus and enters suction tude first pressure stabilizing cavity 8.In the second pressure stabilizing cavity bronchus 12 EGR suction port 23 is arranged, the tail gas that EGR introduces with enter suction tude second pressure stabilizing cavity 11 after first strand of fresh air can fully mix in the second pressure stabilizing cavity bronchus of growing 12.After second burst of fresh air valve 24 throttling, enter suction tude first pressure stabilizing cavity 8 through intake swirl control valve 4.

The air inlet of whole system and give vent to anger situation as shown in Figure 5, first suction port 13 is connected two intake ducts of first cylinder with second suction port 14; The 3rd suction port 15 is connected two intake ducts of second cylinder with the 4th suction port 16; The 5th suction port 17 is connected two intake ducts of the 3rd cylinder with the 6th suction port 18; The 7th suction port 19 is connected two intake ducts of the 4th cylinder with the 8th suction port 20.Fresh air enters by intake-air throttle valve 2 accurate measurements from fresh air inlet 25; The tail gas of outlet pipe enters from 26 accurate measurements of exhaust exhaust gas inlet through water conservancy diversion, after supercooling, EGR suction port 23 (see figure 4)s of importing air inlet tube 5.Fresh air and tail gas through the utility model system handles after, in the outflow of eight suction ports of suction tude shown in accompanying drawing 5 arrows.Wherein, first and third, five, seven suction ports have only fresh air, and second, four, six, eight suction ports are fresh air+EGR tail gas mixed gass.

The overall work process is shown in Fig. 1 to 5, and fresh air has been split into two strands through after valve 21 control flow rate of intake-air throttle valve in air inlet tube, and first strand upwards enters suction tude second pressure stabilizing cavity 11 through the second pressure stabilizing cavity bronchus 12; Second strand enters suction tude first pressure stabilizing cavity 8 after valve 24 control flow rate through the intake swirl control valve to the right, finally flow to first and third, five, seven suction ports.Exhaust tail gas enters the electric control EGR valve from exhaust exhaust gas inlet 26, enter cooler for recycled exhaust gas after the accurate measurement, cooling fully mixes back arrival suction tude second pressure stabilizing cavity 11 with first strand of fresh air at the second pressure stabilizing cavity bronchus 12 after EGR conduit 3 imports to air inlet tube 5, finally flow to second, four, six, eight suction ports.Wherein, first and second suction port enters first cylinder, and third and fourth suction port enters second cylinder, and the 5th, six suction ports enter the 3rd cylinder, and the 7th, eight suction ports enter the 4th cylinder.By controlling the fresh air content of first and third, five, seven suction ports, can lead by the interior EGR of control cylinder, i.e. the shared percentage of cylinder inner exhaust gas.

The application of the structural design of double-deck air inlet tube of the present utility model and three respective valves, the controlled high EGR of low speed acquisition led in both can being implemented in, and can guarantee the charging efficiency of high regime again, farthest reduced the influence that pressurized machine and outlet pipe lead EGR.

More than disclosed only be a specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection domain of the present utility model.

Claims (4)

1. a LD-diesel EGR air intake control system is characterized in that, comprise the air inlet tube that is communicated with fresh air sources, the inlet end of air inlet tube is established intake-air throttle valve, is used to control the air inlet total amount of fresh air; Air inlet tube is a double layer construction, and wherein air inlet tube lower floor is communicated with suction tude first pressure stabilizing cavity and controls the fresh air flow that flows into first pressure stabilizing cavity by the intake swirl control valve, forms the FAI Fresh Air Intake group; Root place, air inlet tube upper strata establishes the EGR suction port, the exhaust flow that enters the EGR suction port is controlled by the electric control EGR valve through cooled tail gas, tail gas mixes on the air inlet tube upper strata with fresh air, abundant mixed tail gas and fresh air enter suction tude second pressure stabilizing cavity, form band EGR tail gas air inlet group.
2. LD-diesel EGR air intake control system according to claim 1, it is characterized in that, described air inlet tube upper strata is communicated with described suction tude second pressure stabilizing cavity by the second pressure stabilizing cavity bronchus, is used for fully mixing tail gas and the fresh air that is positioned at the air inlet tube upper strata.
3. LD-diesel EGR air intake control system according to claim 1 and 2 is characterized in that, also comprises cooler for recycled exhaust gas and EGR conduit, and tail gas cools off in cooler for recycled exhaust gas, enters air inlet tube by the EGR conduit then.
4. LD-diesel EGR air intake control system according to claim 3, it is characterized in that, described LD-diesel is four cylinders, 16 valve diesel, described FAI Fresh Air Intake group comprises first and third, five, seven suction ports, described band EGR tail gas air inlet group comprises second, four, six, eight suction ports, and fresh air inlet is provided with at interval with band EGR tail gas suction port.
CN2010205397081U 2010-09-20 2010-09-20 EGR (exhaust gas recirculation) air inlet control system of light diesel engine CN201891532U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205397081U CN201891532U (en) 2010-09-20 2010-09-20 EGR (exhaust gas recirculation) air inlet control system of light diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205397081U CN201891532U (en) 2010-09-20 2010-09-20 EGR (exhaust gas recirculation) air inlet control system of light diesel engine

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CN201891532U true CN201891532U (en) 2011-07-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410089A (en) * 2010-09-20 2012-04-11 广西玉柴机器股份有限公司 Light diesel engine EGR (Exhaust Gas Recycle) intake control system
CN103397959A (en) * 2013-07-02 2013-11-20 广西玉柴机器股份有限公司 Air inlet connecting pipe of EGR engine
CN104791149A (en) * 2015-04-21 2015-07-22 吉林大学 Gasoline engine air and waste gas layered regulation device and method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410089A (en) * 2010-09-20 2012-04-11 广西玉柴机器股份有限公司 Light diesel engine EGR (Exhaust Gas Recycle) intake control system
CN103397959A (en) * 2013-07-02 2013-11-20 广西玉柴机器股份有限公司 Air inlet connecting pipe of EGR engine
CN104791149A (en) * 2015-04-21 2015-07-22 吉林大学 Gasoline engine air and waste gas layered regulation device and method thereof
CN104791149B (en) * 2015-04-21 2017-04-12 吉林大学 Gasoline engine air and waste gas layered regulation device and method thereof

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Granted publication date: 20110706

Termination date: 20150920