CN1824926A - Method for realizing fast change-over of gasoline engine distributing phase and device thereof - Google Patents
Method for realizing fast change-over of gasoline engine distributing phase and device thereof Download PDFInfo
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- CN1824926A CN1824926A CN200610002141.2A CN200610002141A CN1824926A CN 1824926 A CN1824926 A CN 1824926A CN 200610002141 A CN200610002141 A CN 200610002141A CN 1824926 A CN1824926 A CN 1824926A
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- 238000000034 method Methods 0.000 title claims description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 239000003921 oil Substances 0.000 claims description 22
- 244000144730 Amygdalus persica Species 0.000 claims description 6
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000010705 motor oil Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Abstract
In the invention, be designing a dislocated double-cam mechanism, changing the air inlet and exhaust cams at the same time in the same circulation can realize the early closing of the exhaust valve and the late opening of the air inlet valve to obtain the most residual gas in the cylinder, so that the SI combustion mode is changed to the HCCI combustion mode, on the contrary, the HCCI combustion mode is changed to the SI combustion mode.
Description
Technical field
The present invention relates to a kind of realization petrol engine port timing fast switching method and device thereof, be particularly related to petrol engine and realize smooth-going reliable switching fast between spark ignition (SI) combustion manner and homogeneous charge compression ignition burning (HCCI) mode, belong to motor car engine, combustion in IC engine technical field.
Background technique
Homogeneous charge compression ignition (HCCI) combustion manner can make the combustion thermal efficiency of petrol engine significantly improve, and reaches the level of ordinary diesel oil machine, and the discharging of NOx simultaneously reduces more than 95% than regular gasoline machine, is present international research focus.Generally acknowledged in the world, dual mode operated is the desirable operation strategy of automobile-used hcci engine, promptly uses the HCCI combustion mode under medium and small load, and at big load with cross and carry out the transition to traditional spark ignition (SI) burning or diesel combustion mode operation under the low-load.But the distribution device that uses the conventional gasoline machine is difficult to realize the switching of SI/HCCI combustion manner.So the practical application that has switched to this novel combustion manner between the combustion mode and the difficult point of commercialization.
Find after deliberation, adopt the port timing of negative valve overlap to form the effective measures that a large amount of internal EGRs are realization gasoline HCCI burnings.And to realize the steadily switching smoothly of SI/HCCI combustion mode, need a kind of fast variable valve actuating mechanism that responds, in a circulation, finish the preparation of the required mixed gas of different combustion modes, promptly make the engine breathing port timing change significantly simultaneously in a circulation, thereby in next one circulation, just can finish the switching of SI/HCCI pattern.Simultaneously this mechanism also should possess the outstanding feature of the low and good reliability of cost.
At present in the engine product conventional variable valve timing mechanism as shown in Figure 1, the variation that admission cam shaft is realized port timing is rotated by phase shifter (VCT) by this mechanism.But can not change valve lift and open the duration, and speed of response is slow, can't realize that intake and exhaust change the requirement of port timing simultaneously.And the distribution device (FVVT) of valve lift and phase place continuous variable, by adjusting the rocking arm ratio and cooperating the camshaft rotation, its intake and exhaust cam axle front end is all installed phase shifter (VCT), the change significantly that realizes cam lift and phase place generally needs tens engine cycles just can reach desired value, this mechanism is the cost height not only, and speed of response is slow, and the quick and stable that is difficult to finish between different combustion modes is switched (motor can catch fire and pinking during this period).
The device that can realize at present changing fast port timing in the research is electromagnetic air valve mechanism and electric liquid coupling valve mechanism, but cost is high, and control is complicated, has had a strong impact on practical prospect.Wherein electromagnetic air valve as shown in Figure 2, this mechanism volume is big, weight is big, operational noise is big, poor reliability.
Summary of the invention
The purpose of this invention is to provide a kind of low cost, respond fast port timing switching method and apparatus, need not to adopt cam phase translation device (VCT) to change port timing, and use the Single Over Head Camshaft scheme can realize making in the engine operational cycle intake and exhaust port timing and lift to change significantly simultaneously, in cylinder, keep a large amount of residual gases, reach the switching of quick and stable between spark ignition combustion and the bump combustion chamber pattern.
For reaching above purpose, technological scheme of the present invention is as follows:
The quick device for switching of a kind of realization petrol engine port timing, comprise cylinder cap, Timing Belt, camshaft pulley, camshaft, be arranged on the valve on the cylinder cap and be arranged on laterostigmatal valve spring, it is characterized in that: dislocation double-cam mechanism is housed on Single Over Head Camshaft, on described valve top the variable lift hydraulic tappet is installed, be provided with solenoid valve on the cylinder cap main oil gallery, the lift of variable lift hydraulic tappet is driven by dislocation double-cam mechanism; Every cylinder is provided with four kinds of cams in the described dislocation double-cam mechanism, is respectively compression-ignition mode exhaust cam, ignition mode exhaust cam, ignition mode intake cam, compression-ignition mode intake cam; All intake and exhaust cams all are arranged on the camshaft, and compression-ignition mode intake cam peach point is with respect to the sharp hysteresis of ignition mode intake cam peach; Compression-ignition mode exhaust cam peach point with respect to ignition mode exhaust SI nose in advance; Ignition mode intake cam external frame contains compression-ignition mode intake cam external frame, and ignition mode exhaust cam external frame contains compression-ignition mode exhaust cam external frame; The port timing of ignition mode cam is a plus lap, and the port timing of compression ignite cam is a under lap; The selection of the driving cam of described dislocation double-cam mechanism is by electromagnetic valve.
Be provided with the valve edge cap that is used for the adjusting play between valve of the present invention and the variable lift hydraulic tappet.
The invention provides a kind of petrol engine port timing fast switching method, it is characterized in that: its port timing switch step is as follows:
1) under spark-ignition combustion mode, the oil circuit of solenoid valve is communicated with oil pump, set up engine oil pressure in the cylinder cap main oil gallery and make the locking of variable lift hydraulic tappet, this moment, the ignition mode intake cam drove intake valve, the ignition mode exhaust cam drives exhaust valve, promptly realizes the port timing that spark-ignition combustion mode is required;
2) when the needs port timing is switched, the oil circuit of solenoid valve is communicated with oil sump, engine oil pressure in the cylinder cap main oil gallery is released, the variable lift hydraulic tappet unlocks, this moment, the compression-ignition mode intake cam drove intake valve, the compression-ignition mode exhaust cam drives exhaust valve, promptly realizes the switching of the interior spark-ignition combustion mode of a work cycle to the required port timing of pressuring combustion ignition pattern.
The present invention compared with prior art has the following advantages and the high-lighting effect: do not have the middle transition process in the handoff procedure, change the handoff procedure fast and reliable significantly when can finish air inlet port timing and exhaust port timing in a circulation.Compare with FVVT mechanism with electromagnetic air valve mechanism, electric liquid coupling valve mechanism, have that cost is low, mechanism is compact, reliable operation, response rapidly, control is simple, control accurate advantage, has outstanding practical application foreground.Test result proves that this variable valve actuating mechanism response is fast, and motor can be finished the smooth switching between the SI/HCCI combustion mode in a work cycle.During middle-low load, switch to the HCCI combustion mode from the SI combustion mode after, actual measurement NOx discharging is 0～20ppm, reduces the NOx discharging more than 95% than SI combustion mode petrol engine under the same load, no soot discharges, fuel consumption rate reaches the diesel engine level.
Description of drawings
Fig. 1 is conventional variable valve timing mechanism schematic representation.
Fig. 2 is an electromagnetic air valve variable valve actuating mechanism schematic representation in the foreign study.
Fig. 3 is the structural representation of the port timing apparatus for fast switching of employing Single Over Head Camshaft provided by the invention.
Fig. 4 is the sectional drawing that passes through the valve center line of Fig. 3.
Fig. 5 is the schematic representation of the dislocation double-cam mechanism in the variable valve timing apparatus for fast switching, expresses cam profile and phase place and arranges.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention, working procedure and embodiment are further described.
Fig. 3, Fig. 4 are the structural representation of the port timing apparatus for fast switching of employing Single Over Head Camshaft provided by the invention.This device comprises cylinder cap 1, Timing Belt 2, and camshaft pulley 3, camshaft 4 is arranged on valve 5 on the cylinder cap and living beings in laterostigmatal valve spring 6, valve edge cap 7, variable lift hydraulic tappet 8, cylinder cap main oil gallery 9 and solenoid valve 10.Dislocation double-cam mechanism is housed on Single Over Head Camshaft 4, dislocation double-cam mechanism design as shown in Figure 5, every cylinder is provided with four kinds of cams in the dislocation double-cam mechanism, comprises compression-ignition mode (HCCI) exhaust cam 11, ignition mode (SI) exhaust cam 12, ignition mode (SI) intake cam 13, compression-ignition mode (HCCI) intake cam 14 respectively.Variable valve actuating mechanism of the present invention changes when can realize fast valve lift and valve-control.Two ignition mode (SI) cam spark ignition petrol engine phase place is routinely arranged, two compression-ignition mode (HCCI) cam counterrotating phase place is arranged.In a circulation, switch the ignition mode intake and exhaust cam simultaneously to the compression-ignition mode intake and exhaust cam, the realization exhaust valve early closes with intake valve to be opened evening, obtain residual gas in a large amount of cylinders, reach the requirement of HCCI burning, thereby switch to the HCCI combustion mode from the SI combustion mode.Otherwise, switch to the SI combustion mode from the HCCI combustion mode.
Embodiment:
Be that compression ratio is that the port timing of 13,4 kinds of cams sees the following form on 95 millimeters the motor at a cylinder bore.
Motor adopts the starting of SI combustion mode; Motor switches the cam that works by variable lift hydraulic tappet (German INA company engine component product, Part No. 99610522524) when middle-low load, realize petrol engine port timing fast switching method, and step is as follows:
1) under spark-ignition combustion mode, the oil circuit of solenoid valve 10 is communicated with oil pump, set up engine oil pressure in the cylinder cap main oil gallery 9 and make 8 lockings of variable lift hydraulic tappet, this moment, variable lift hydraulic tappet outer shroud surface of contact was a working surface, make ignition mode intake cam 13 drive intake valve, ignition mode exhaust cam 12 drives exhaust valve, promptly realizes the port timing that spark-ignition combustion mode is required;
2) when the needs port timing is switched, open two-position three way magnetic valve, the oil circuit of solenoid valve is communicated with oil sump, engine oil pressure in the cylinder cap main oil gallery 9 is released, variable lift hydraulic tappet 8 unlocks, and the interior loop contacts face of variable lift hydraulic tappet this moment is a working surface, makes compression-ignition mode intake cam 14 drive intake valves, compression-ignition mode exhaust cam 11 drives exhaust valve, promptly realizes the switching of the port timing that compression-ignition mode is required.Because the variation of the port timing that the design of four kinds of cam profiles has been considered as long as therefore unload oil pressure, can form significantly negative valve overlap port timing, keeps enough high temperature exhaust gas, guarantees that reliable and stable HCCI burns.
In an engine cycles, can realize conventional SI port timing (valve lift 10mm by above step, 30 ° of CA of overlapping angle) to HCCI port timing (valve lift 5mm, the 150 ° of CA under lap angle) switching, thereby intercept the high-temp waste gas of suitable quality, high-temp waste gas in the cylinder of holding back is contracted by weight, pressure spike appears in the engine breathing top dead center, the a large amount of high temperature exhaust gas that keep in the cylinder make the interior compression terminal temperature of next circulation cylinder increase substantially, and motor switches to HCCI combustion mode port timing from SI combustion mode port timing in a work cycle.
Enforcement operating mode example:
| The SI cam | The HCCI cam | |
| EVO BBDC ° CA left by exhaust valve | 56 | 45 |
| Exhaust valve closes ATDC ° of CA of EVC | 12 | -75 |
| BTDC ° of CA of IVO Inlet Valve Open IVO | 12 | -75 |
| Intake valve closes ABDC ° of CA of IVC | 36 | 45 |
Claims (3)
1. quick device for switching of realization petrol engine port timing, comprise cylinder cap (1), Timing Belt (2), camshaft pulley (3), camshaft (4), be arranged on the valve (5) on the cylinder cap and be arranged on laterostigmatal valve spring (6), it is characterized in that: dislocation double-cam mechanism is housed on Single Over Head Camshaft, on described valve top variable lift hydraulic tappet (8) is installed, be provided with solenoid valve (10) on cylinder cap main oil gallery (9), the lift of variable lift hydraulic tappet is driven by dislocation double-cam mechanism; Every cylinder is provided with four kinds of cams in the described dislocation double-cam mechanism, is respectively compression-ignition mode exhaust cam (11), ignition mode exhaust cam (12), ignition mode intake cam (13), compression-ignition mode intake cam (14); All intake and exhaust cams all are arranged on the camshaft, and compression-ignition mode intake cam peach point is with respect to the sharp hysteresis of ignition mode intake cam peach; Compression-ignition mode exhaust cam peach point with respect to ignition mode exhaust SI nose in advance; Ignition mode intake cam external frame contains compression-ignition mode intake cam external frame, and ignition mode exhaust cam external frame contains compression-ignition mode exhaust cam external frame; The port timing of ignition mode cam is a plus lap, and the port timing of compression ignite cam is a under lap; The selection of the driving cam of described dislocation double-cam mechanism is by electromagnetic valve.
2. according to the quick device for switching of the described a kind of realization petrol engine port timing of claim 1, it is characterized in that: between described valve and variable lift hydraulic tappet, be provided with the valve edge cap (7) that is used for the adjusting play.
3. petrol engine port timing fast switching method that employing is installed according to claim 1, it is characterized in that: its port timing switch step is as follows:
1) under spark-ignition combustion mode, the oil circuit of solenoid valve (10) is communicated with oil pump, set up engine oil pressure in the cylinder cap main oil gallery (9) and make variable lift hydraulic tappet (8) locking, ignition mode intake cam this moment (13) drives intake valve, ignition mode exhaust cam (12) drives exhaust valve, promptly realizes the port timing that spark-ignition combustion mode is required;
2) when the needs port timing is switched, the oil circuit of solenoid valve is communicated with oil sump, engine oil pressure in the cylinder cap main oil gallery (9) is released, variable lift hydraulic tappet (8) unlocks, compression-ignition mode intake cam this moment (14) drives intake valve, compression-ignition mode exhaust cam (11) drives exhaust valve, promptly realizes the switching of the interior spark-ignition combustion mode of a work cycle to the required port timing of pressuring combustion ignition pattern.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100021412A CN100363597C (en) | 2006-01-19 | 2006-01-19 | Method for realizing fast change-over of gasoline engine distributing phase and device thereof |
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| CNB2006100021412A CN100363597C (en) | 2006-01-19 | 2006-01-19 | Method for realizing fast change-over of gasoline engine distributing phase and device thereof |
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Cited By (11)
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| CN101397921B (en) * | 2008-10-23 | 2010-04-07 | 浙江大学 | Electric driving fully variable valve actuator for air-powered engine |
| CN101598044B (en) * | 2008-11-27 | 2011-12-07 | 包敢锋 | Intelligent variable valve adjusting device belt pulley and preparation method thereof |
| CN101408119B (en) * | 2007-10-10 | 2012-06-27 | 株式会社丰田自动织机 | Failure diagnosis apparatus for homogeneous charge compression ignition engine |
| CN101699040B (en) * | 2009-10-26 | 2012-07-25 | 清华大学 | Two-stage variable compression ratio system of gasoline engine and control method thereof |
| CN101196143B (en) * | 2006-12-01 | 2013-01-30 | 福特环球技术公司 | Multiple combustion mode engine using direct alcohol injection |
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| CN109819665A (en) * | 2016-09-09 | 2019-05-28 | 世倍特集团有限责任公司 | For controlling after scavenging period in the cylinder of internal combustion engine remaining residual gas quality and/or the method and apparatus for washing away air quality in the exhaust manifold for pouring internal combustion engine during scavenging period |
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| JPS6027717A (en) * | 1983-07-27 | 1985-02-12 | Honda Motor Co Ltd | Lubricator |
| JPS643208A (en) * | 1987-06-23 | 1989-01-09 | Honda Motor Co Ltd | Tappet valve system for internal combustion engine |
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| US6244330B1 (en) * | 1998-11-16 | 2001-06-12 | Foster Wheeler Corporation | Anti-vibration ties for tube bundles and related method |
| US20050183693A1 (en) * | 2004-02-25 | 2005-08-25 | Ford Global Technologies Llc | Method and apparatus for controlling operation of dual mode hcci engines |
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2006
- 2006-01-19 CN CNB2006100021412A patent/CN100363597C/en active Active
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| CN101196143B (en) * | 2006-12-01 | 2013-01-30 | 福特环球技术公司 | Multiple combustion mode engine using direct alcohol injection |
| CN101408119B (en) * | 2007-10-10 | 2012-06-27 | 株式会社丰田自动织机 | Failure diagnosis apparatus for homogeneous charge compression ignition engine |
| CN101397921B (en) * | 2008-10-23 | 2010-04-07 | 浙江大学 | Electric driving fully variable valve actuator for air-powered engine |
| CN101598044B (en) * | 2008-11-27 | 2011-12-07 | 包敢锋 | Intelligent variable valve adjusting device belt pulley and preparation method thereof |
| CN101699040B (en) * | 2009-10-26 | 2012-07-25 | 清华大学 | Two-stage variable compression ratio system of gasoline engine and control method thereof |
| CN108699925A (en) * | 2016-04-07 | 2018-10-23 | 宝马股份公司 | Valve actuating mechanism and engine pack |
| CN107448255A (en) * | 2016-05-31 | 2017-12-08 | 福特环球技术公司 | For the method and system for the exhaust valve for operating explosive motor |
| CN109819665A (en) * | 2016-09-09 | 2019-05-28 | 世倍特集团有限责任公司 | For controlling after scavenging period in the cylinder of internal combustion engine remaining residual gas quality and/or the method and apparatus for washing away air quality in the exhaust manifold for pouring internal combustion engine during scavenging period |
| CN109819665B (en) * | 2016-09-09 | 2022-05-17 | 世倍特集团有限责任公司 | Method and device for controlling residual gas mass in cylinder and/or flushing air mass in exhaust manifold of internal combustion engine |
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Address after: 215200, Suzhou 2358, Changan Road, Wujiang District, Jiangsu 6, Wujiang science and Technology Pioneer Park, 2 floors Patentee after: SUZHOU AUTOMOBILE RESEARCH INSTITUTE, TSINGHUA UNIVERSITY (WUJIANG) Patentee after: Tsinghua University Address before: 215134, Suzhou 2358, Changan Road, Wujiang District, Jiangsu 6, Wujiang science and Technology Pioneer Park, 2 floors Patentee before: SUZHOU AUTOMOBILE RESEARCH INSTITUTE, TSINGHUA UNIVERSITY (WUJIANG) Patentee before: Tsinghua University |