CN202132135U - Small-sized gasoline engine with internal EGR low-temperature consumption system - Google Patents
Small-sized gasoline engine with internal EGR low-temperature consumption system Download PDFInfo
- Publication number
- CN202132135U CN202132135U CN201120221188U CN201120221188U CN202132135U CN 202132135 U CN202132135 U CN 202132135U CN 201120221188 U CN201120221188 U CN 201120221188U CN 201120221188 U CN201120221188 U CN 201120221188U CN 202132135 U CN202132135 U CN 202132135U
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- valve
- gasoline engine
- exhaust
- cam
- outlet valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The utility model mainly relates to a small-sized gasoline engine with an internal EGR (Exhaust Gas Recirculation) low-temperature consumption system. The gasoline engine is provided with an intake valve, an exhaust valve, an admission cam for controlling the intake valve and an exhaust cam for controlling the exhaust valve, wherein the intake valve and the exhaust valve have an overlapping angle theta s; the amount of EGR is controlled by adjusting the overlapping angle theta s of the intake valve and the exhaust valve, so that one part of combustion waste gas remains in the cylinder of the engine and is mixed with an air-fuel mixture entering the cylinder in next circulation. The consumption temperature of a mixed gas is reduced by reducing the oxygen concentration in the mixed gas and increasing the specific heat capacity of the mixed gas, so that the concentration of NOx in the exhaust gas is reduced.
Description
Technical field
The utility model relates generally to the four stroke cycle miniature gasoline engine.The miniature gasoline engine that particularly has internal EGR low-temperature burning system.
Background technique
Miniature gasoline engine is in order to tackle more strict emission control standards, need organize the more effective post processing mode and the combustion process of cleaning more.Miniature gasoline engine adopts rich mixture usually in order to obtain higher power, but can cause higher H C discharging like this.Adopt rarer mixed gas can reduce the HC discharging, but the discharging of nitrogen oxide (NOx) become new problem.Therefore how to obtain lower HC and the NOx total emission volumn becomes topmost problem.
Engine exhaust gas recirculation is an effective technology of control NOx noxious emission; Can make part residual gas (internal EGR) stay in the cylinder through gas recirculation system; And with burn again after the air-fuel mixture that gets into cylinder mixes, reduced the discharge amount of the NOx in the engine exhaust pollutant effectively.
Conventional miniature gasoline engine needs to reduce the intake and exhaust resistance loss in order to improve power character and Economy, improves the air inlet charge.Therefore the suction valve of internal-combustion engine needs to open in advance; And outlet valve is wanted late release, and intake valve and exhaust valve are in opening state simultaneously in a period of time, so that gas of combustion is fully discharged; Obtain higher engine power, thereby be difficult to realize internal exhaust gas recirculation (internal EGR) technology.
The utility model provides a kind of miniature gasoline engine with internal EGR low-temperature burning system that can solve the problems of the technologies described above.Provide a kind of in operation range, make discharge that the NOx concentration that comprises in the gas reduces have an internal EGR low-temperature burning system miniature gasoline engine.
Summary of the invention
According to the utility model; Through Design and Machining or utilize certain regulating mechanism adjustment suction valve and exhaust-valve cam relative position; And then the overlapping angle of control suction valve and outlet valve is to obtain proper engine internal EGR amount; And then realize the low-temperature burning process, and reducing the NOx discharging, its concrete technological scheme is following:
A kind of miniature gasoline engine with internal EGR low-temperature burning system; The exhaust cam that said petrol engine has suction valve, outlet valve and is used to control the intake cam of suction valve and is used to control outlet valve; Suction valve and outlet valve have overlapping angle θ s; It is characterized in that, through the overlapping angle θ s control EGR amount of adjustment suction valve and outlet valve.
Said suction valve and outlet valve overlapping angle θ s are 20 °～45 ° crank angles.
Said intake cam and exhaust cam have the center line angle theta, adjust the overlapping angle θ s of suction valve and outlet valve through the center line angle theta of adjusting said intake cam and exhaust cam.
The center line angle theta of said intake cam and exhaust cam is 100 °～112 °.
The center line angle theta of said intake cam and exhaust cam is that direct Design and Machining forms or utilize the regulating mechanism adjustment to form.
Description of drawings
Fig. 1 is a distribution device.
Fig. 2 shows the exhaust valve lift of the miniature gasoline engine that is equipped with internal EGR low-temperature burning system and the graph of a relation of suction valve lift and crankangle.
Fig. 3 is intake cam and exhaust cam location diagram.
Embodiment
Describe the embodiment of the utility model with reference to the accompanying drawings in detail.
As shown in Figure 1; A kind of miniature gasoline engine with internal EGR low-temperature burning system; This petrol engine has suction valve 11, outlet valve 10, tappet 4 and 5, push rod 6 and 7, rocking arm 8 and 9 and the exhaust cam 2 that is used to control the intake cam 3 of suction valve and is used to control outlet valve, and intake cam 3 is installed on the camshaft 1 with exhaust cam 2.Exhaust cam 2 is through tappet 4, and push rod 6 and rocking arm 8 drive outlet valve 10 opening and closing; And intake cam passes through tappet 5, and push rod 7 and rocking arm 9 drive outlet valves 11 opening and closing.
The motion lift of suction valve and outlet valve is as shown in Figure 2.The lifting curve of the lifting curve of outlet valve 10 and suction valve 11 and the relation of crank angle are represented respectively by Ex and In.Valve overlap angle θ s through suitable makes part waste gas stay in the cylinder, thus, realizes reducing the mixture combustion temperature, reduces NOx and generates.The calculating benchmark of overlapping angle θ s is 0.2mm for the air inlet and exhaust valve gap in the utility model.If the valve overlap angle is too little, then the internal EGR amount is too much, can cause engine power too small; If the valve overlap angle is excessive, then the internal EGR amount is too little, can not reduce the NOx discharge amount effectively; Therefore answer choose reasonable valve overlap angle.Overlapping angle θ s can realize suitable internal EGR amount when getting 20 °～45 °.
Through the relative installation of Design and Machining or regulating mechanism adjustment exhaust cam 2 and intake cam 3, adjust the overlapping angle θ s of suction valve and outlet valve.Exhaust cam 2 is represented with the angle theta of exhaust cam 2 center lines 12 by intake cam 3 center lines 13 with the relative installation of intake cam 3, and is as shown in Figure 3.
When the angle theta of intake cam 3 center lines 13 and exhaust cam 2 center lines 12 is 112 °; The overlapping angle of suction valve and outlet valve is about 20 ° of crank angles, and NOx discharging this moment is that 45 °～50 ° motor NOx discharge value has reduced about 10% with respect to valve overlap.When the angle theta of intake cam 3 center lines 13 and exhaust cam 2 center lines 12 is 100 °; The overlapping angle of suction valve and outlet valve is about 45 ° of crank angles, and NOx discharging this moment is that 45 °～50 ° motor NOx discharge value has reduced about 25% with respect to valve overlap.
Claims (5)
1. miniature gasoline engine with internal EGR low-temperature burning system; The exhaust cam that said petrol engine has suction valve, outlet valve and is used to control the intake cam of suction valve and is used to control outlet valve; Suction valve and outlet valve have overlapping angle θ s; It is characterized in that, through the overlapping angle θ s control EGR amount of adjustment suction valve and outlet valve.
2. miniature gasoline engine according to claim 1 is characterized in that, said suction valve and outlet valve overlapping angle θ s are 20 °～45 ° crank angles.
3. miniature gasoline engine according to claim 1 is characterized in that said intake cam and exhaust cam have the center line angle theta, adjusts the overlapping angle θ s of suction valve and outlet valve through the center line angle theta of adjusting said intake cam and exhaust cam.
4. miniature gasoline engine according to claim 3 is characterized in that, the center line angle theta of said intake cam and exhaust cam is 100 °～112 °.
5. miniature gasoline engine according to claim 4 is characterized in that, the center line angle theta of said intake cam and exhaust cam is that direct Design and Machining forms or utilize the regulating mechanism adjustment to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120221188U CN202132135U (en) | 2011-06-28 | 2011-06-28 | Small-sized gasoline engine with internal EGR low-temperature consumption system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120221188U CN202132135U (en) | 2011-06-28 | 2011-06-28 | Small-sized gasoline engine with internal EGR low-temperature consumption system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202132135U true CN202132135U (en) | 2012-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120221188U Expired - Lifetime CN202132135U (en) | 2011-06-28 | 2011-06-28 | Small-sized gasoline engine with internal EGR low-temperature consumption system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202132135U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511133A (en) * | 2012-06-25 | 2014-01-15 | 通用汽车环球科技运作有限责任公司 | Engine including low pressure EGR system and internal EGR |
| CN109973258A (en) * | 2017-12-28 | 2019-07-05 | 中国船舶重工集团公司第七一一研究所 | Egr system and internal combustion engine including egr system |
-
2011
- 2011-06-28 CN CN201120221188U patent/CN202132135U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511133A (en) * | 2012-06-25 | 2014-01-15 | 通用汽车环球科技运作有限责任公司 | Engine including low pressure EGR system and internal EGR |
| CN109973258A (en) * | 2017-12-28 | 2019-07-05 | 中国船舶重工集团公司第七一一研究所 | Egr system and internal combustion engine including egr system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120201 |
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| CX01 | Expiry of patent term |