CN101201009A - Engine valve timing and lift continuously variable system - Google Patents
Engine valve timing and lift continuously variable system Download PDFInfo
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- CN101201009A CN101201009A CNA2007101507047A CN200710150704A CN101201009A CN 101201009 A CN101201009 A CN 101201009A CN A2007101507047 A CNA2007101507047 A CN A2007101507047A CN 200710150704 A CN200710150704 A CN 200710150704A CN 101201009 A CN101201009 A CN 101201009A
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Abstract
The invention discloses a continuously variable timing and lifting system for engine valve, comprising a hydraulic oil pump and an accumulator, wherein the oil outlet of the hydraulic oil pump is connected with the accumulator; and the accumulator is provided with a pressure regulating valve. The invention also comprises a two-position two-way solenoid valve, an electronic control unit connected with the solenoid valve, a valve rocker and a hydraulic push rod assembly, wherein the oil outlet of the two-position two-way solenoid valve is connected with the accumulator via an oil pipeline. The hydraulic push rod assembly consists of a push rod, a pressure chamber and a hydraulic piston, wherein, the hydraulic piston is arranged in the pressure chamber and connected with the push rod; the valve rocker is arranged on and presses down the piston. The pressure chamber is connected with the oil outlet of the solenoid valve via a pipeline. The system has simple structure and the control and the adjustment are convenient; the requirements of the machining accuracy and the chemical performance of coupling pieces of the hydraulic push rod are not very high; the service life is long; the timing and the lifting can be continuously and flexibly adjusted; the system can be refitted from the existing push rod of the common engine without many alterations, thereby it is easy to realize the industrialization of the system.
Description
Technical field
The present invention relates to the engine variable technology, relate in particular to engine valve timing and lift continuously variable system.
Background technique
Traditional piston four stroke engine generally adopts the distribution device of mechanical type camshaft actuated inlet door and exhaust valve.Valve move through bent axle and camshaft, the mechanical transmission between camshaft and each valve is controlled regularly.For a long time, this mechanical type mechanism is proved to be simply, effectively and reliably, and expense is cheap relatively.Yet this valve mechanism is in the unlatching moment of valve, and it is changeless opening on the parameters such as endurance and valve lift, can't regulate in engine operation, and work lacks flexible.And these changeless valve Operational Limitss can only be by various port timing test, therefrom choose a kind of compromise proposal of engine performance when taking into account various operating mode, best timing can not be provided in all cases, and the engine performance potentiality can not be not fully exerted.Because this compromise basic demand that can satisfy the most of operating mode of internal-combustion engine is so be considered to feasible.But since the eighties in 20th century, the energy and environmental problem become increasingly conspicuous, society is to the increasingly stringent that requires of the Economy of fuel oil and noxious emission, how to improve performance, the raising thermal efficiency of motor and reduce noxious emission more and more receiving publicity, this just requires conventional engines is improved.
Port timing directly affects the intake and exhaust performance of motor, and the quality of combustion process is played crucial effects.The selection of port timing will be considered the problems such as fuel economy, low-speed stability and toxic emission under the high-speed power, low speed torque, idling oil consumption, sub load of motor.In order to obtain engine performance preferably, port timing should change along with the variation of rotating speed and load.Motor is needing bigger valve overlap and IC Intake Valve Closes angle at a high speed and under the big load, so that obtain higher power output; Otherwise, at idling and less IC Intake Valve Closes angle and the valve overlap of the next needs of the little load of low speed, so that obtain idling stationarity and gas exhausting property preferably.
Engine operation person has improved the design of motor at reducing Engine's Harmful Emission, improved the control system of motor, exhaust gas recirculation (EGR) and post-processing technology have appearred, yet be accompanied by the minimizing of Engine's Harmful Emission, but cause the reduction of engine efficiency, and when adopting high pressure-charging pressure, may cause the motor maximum explosive pressure too high.The variable gas distribution technology can realize miller cycle by changing the valve opening close moment, under certain operating mode of motor operation, can utilize in the compression stroke, the time that the retarded admission door is closed, the gas that makes a part enter cylinder reenters intake manifold, and under turbo charged effect, keeping certain air pressure, the intake efficiency of motor can increase and reduce pump greatly and inhale loss.Thereby the many reduction compression ratios when so just having caused actual pressurized air not have air inlet cause expansion ratio greater than compression ratio, reduce the maximum explosive pressure of engine operation.
Compare with fixing port timing, variable valve timing then can be under rotating speed in the whole operating range of motor and load, best valve opening, close moment or lift is provided, thereby improve motor inlet and outlet performance, satisfy the requirement of motor preferably, the whole motor combination property that improves in high rotating speed and the slow-speed of revolution, big load power character, Economy, toxic emission during with little load.The development of modern high technology is carried out comprehensive study and technological development with energy-conservation, synergy, the low emission of motor car engine as " energy-conservation-efficient-environmental protection " integrated problem.The changeless restriction of the port timing incompatibility requirements of the times that more and more seem, for this reason, the changeable air valve technology has become one of motor car engine research emphasis direction.
The variable gas distribution technology is because the advantage of self, be subject to people's attention day by day, foreign study mechanism has carried out a large amount of research, a variety of variable valve actuations have appearred, some system has realized the function of valve changeable parameters, but have only minority mechanism simple in structure, lower-cost to realize commercialization, most of variable valve actuations are because the higher or reliability problems of cost is only at the experimental stage.Variable valve actuating mechanism in the existing product is main mode with the phase place that changes camshaft, and is all bigger to the change of former motor, is more common in the small-power petrol engine.Because high-power diesel engine intake and exhaust cam axle is divided into " overhead " and " putting at the bottom of the side " two kinds, because " putting at the bottom of the side " camshaft makes engine structure simple, low cost of manufacture, use very extensive at present, usually its inlet and exhaust valve is by same camshaft actuated, be difficult to make inlet and exhaust valve to adjust respectively, so the changeable air valve technology of high-power diesel engine remains to be developed.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of both less demanding to material and process equipment are provided, little to former diesel engine change, the while can reliably be realized the engine valve timing and the lift continuously variable system of engine valve timing and the continuous flexibility and changeability of lift again.
The technical solution adopted for the present invention to solve the technical problems is: engine valve timing and lift continuously variable system, it comprises hydraulic-pressure pump, the accumulator that links to each other with the oil outlet of described hydraulic-pressure pump, described accumulator is provided with pressure regulator valve, it also comprises the 2/2-way solenoid valve that its filler opening links to each other with described accumulator by oil supply line, the ECU (Electrical Control Unit) that links to each other with described solenoid valve, valve rocker, the hydraulic push rod assembly, described hydraulic push rod assembly comprises a push rod, the pressure chamber, be arranged on the hydraulic piston that links to each other with described push rod in the described pressure chamber, valve rocker is pressed on the described piston, and described pressure chamber is connected with the oil outlet of described solenoid valve by pipeline.
The invention has the beneficial effects as follows that system architecture is simple, control easy to adjust; Machining accuracy and mechanical properties of materials to hydraulic push rod idol part do not have too high request, the long service life of element; Timing and lift can be adjusted continuously flexibly; Can on the existing push rod basis of common engine, reequip, little to former machine change, be easy to the industrialization of the technology that realizes.
Description of drawings
Accompanying drawing is the systematic schematic diagram of engine valve timing of the present invention and lift continuously variable system.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Engine valve timing and lift continuously variable system as shown in drawings, it comprises hydraulic-pressure pump 5, the accumulator 4 that links to each other with the oil outlet of described hydraulic-pressure pump 5, described accumulator 4 is provided with pressure regulator valve 3, it also comprises the 2/2-way solenoid valve 2 that its filler opening links to each other with described accumulator 4 by oil supply line, the ECU (Electrical Control Unit) 6 that links to each other with described solenoid valve, valve rocker, hydraulic push rod assembly 1, described hydraulic push rod assembly 1 comprises a push rod, pressure chamber 7, be arranged on the hydraulic piston 8 that links to each other with described push rod in the described pressure chamber 7, valve rocker is pressed on the described piston 8, and described pressure chamber 7 is connected by the oil outlet of pipeline with described solenoid valve 2.Described hydraulic-pressure pump can be any in gear pump, plunger pump, rotor pump and the vane pump.Accumulator 4 can be any type of stable-pressure device, and the oil duct that also can use enough volumes plays pressure stabilization function.Described ECU (Electrical Control Unit) 6 can be special-purpose controlling component, also the control function can be integrated in the control unit of engine (ECU).Described hydraulic push rod assembly 1 can be converted by the former machine push rod of motor.
Of the present inventionly comprise two kinds of mode of operations: a kind of is the mode of operation of strap cam axle, and a kind of is the mode of operation of strap cam axle not.
1. strap cam axle mode of operation
This system is under the mode of operation that cooperates camshaft, when system is idle, the described 2/2-way solenoid valve 2 of described ECU (Electrical Control Unit) 6 controls keeps normally off, the machine oil that described hydraulic-pressure pump 5 is carried enters supply reservoir through described pressure regulator valve 3, described hydraulic push rod assembly 1 pumps with the engine cam rotation, and inlet and exhaust valve is moved with lift according to the timing of former machine, and this moment, hydraulic piston 8 was in lowest order, the push rod length minimum, valve moves according to cam profile.
When described hydraulic push rod assembly 1 is rotating in the process that pumps with engine cam, open fuel feeding in piston chamber by described ECU (Electrical Control Unit) 6 control 2/2-way solenoid valves 2 in a certain moment of setting, piston chamber's internal pressure is raise rapidly, when pressure during greater than valve spring power, described hydraulic piston 8 is up in piston chamber, and described hydraulic push rod assembly 1 length increases; When described hydraulic push rod assembly 1 in same distribution circulation, cut off fuel feeding in piston chamber by the described 2/2-way solenoid valve 2 of described ECU (Electrical Control Unit) 6 controls constantly at another, and make piston chamber and fuel tank UNICOM, piston chamber's inner engine oil pushes back sump under the effect of valve spring power, piston chamber's internal pressure is reduced rapidly, described hydraulic push rod assembly 1 returns to raw footage rapidly, finishes the adjustment of timing and lift in distribution circulation of motor.
2. strap cam axle mode of operation not
This system is at strap cam axle not independently under the mode of operation, described hydraulic push rod assembly 1 can place any position that engine valve is moved, described ECU (Electrical Control Unit) 6 is opened fuel feeding in piston chamber by the described 2/2-way solenoid valve 2 of control in a certain moment of setting, piston chamber's internal pressure is raise, when pressure during greater than valve spring power, described hydraulic push rod assembly 1 length increases, valve opening; When described hydraulic push rod assembly 1 in same distribution circulation, cut off fuel feeding in piston chamber by ECU (Electrical Control Unit) 6 control 2/2-way solenoid valves 2 constantly at another that set, piston chamber's inner engine oil is because the effect of valve spring elastic force pushes back sump, piston chamber's internal pressure is reduced, described hydraulic push rod assembly 1 returns to raw footage, valve event is finished in valve-closing one time.
Engine valve timing of the present invention and lift continuously variable system, accurately control according to engine operating state by ECU (Electrical Control Unit) 6, by the moment of in good time adjustment 2/2-way solenoid valve 2 opening and closing, can adjust oil-feed in the piston chamber and oil-break in the hydraulic push rod assembly 1 flexibly, by changing the length of hydraulic push rod assembly 1, adjust the timing and the lift of engine breathing flexibly, thereby adjust engines distribution to the optimum state.
Engine valve timing of the present invention and lift continuously variable system, its advantage is:
1. system architecture is simple, and is little to former machine change, can realize low cost fabrication;
Since to the pressure in the accumulator less demanding (only need 5～10MPa), the required driving power of low pressure fuel pump is little, so The power consumption of system is little;
3. this system acts on respectively each cylinder of engine, can realize the separate adjustment of each cylinder intake and exhaust, also can realize wherein certain Single cylinder or a few cylinder intake and exhaust are adjusted, and bring into play to greatest extent the variable flexibility of intake and exhaust phase place and lift, optimize The performance of engine;
4. this system controls flexibly by automatical control system, can be by the figure of the control MAP under the various operating modes of full course of inquiry engine operation, and real-time adjusts to the optimum state with intake and exhaust;
5. system's control is simple and convenient, only need carry out time-oriented sequential control to a 2/2-way solenoid valve and just can make system satisfy the requirement of engine valve timing and lift continuous changeable;
6. when adopting the independent working mode of strap cam axle not, can cancel engine cam, reduce motor and be lost in power consumption on the distribution device.
Claims (4)
1. engine valve timing and lift continuously variable system, it comprises hydraulic-pressure pump, the accumulator that links to each other with the oil outlet of described hydraulic-pressure pump, described accumulator is provided with pressure regulator valve, it is characterized in that: it also comprises the 2/2-way solenoid valve that its filler opening links to each other with described accumulator by oil supply line, the ECU (Electrical Control Unit) that links to each other with described solenoid valve, valve rocker, the hydraulic push rod assembly, described hydraulic push rod assembly comprises a push rod, the pressure chamber, be arranged on the hydraulic piston that links to each other with described push rod in the described pressure chamber, valve rocker is pressed on the described piston, and described pressure chamber is connected with the oil outlet of described solenoid valve by pipeline.
2. engine valve timing according to claim 1 and lift continuously variable system is characterized in that: described hydraulic-pressure pump is a kind of in gear pump, plunger pump, rotor pump and the vane pump.
3. engine valve timing according to claim 1 and lift continuously variable system is characterized in that: described accumulator is for stable-pressure device independently or use the oil duct of enough volumes.
4. engine valve timing according to claim 1 and lift continuously variable system is characterized in that: described ECU (Electrical Control Unit) maybe will be controlled function for special-purpose controlling component and be integrated in the control unit of engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101507047A CN101201009A (en) | 2007-12-04 | 2007-12-04 | Engine valve timing and lift continuously variable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101507047A CN101201009A (en) | 2007-12-04 | 2007-12-04 | Engine valve timing and lift continuously variable system |
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| Publication Number | Publication Date |
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| CN101201009A true CN101201009A (en) | 2008-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101507047A Pending CN101201009A (en) | 2007-12-04 | 2007-12-04 | Engine valve timing and lift continuously variable system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975098A (en) * | 2010-09-30 | 2011-02-16 | 哈尔滨工程大学 | Camless electrohydraulic variable valve timing system based on fuel medium |
| CN101526042B (en) * | 2008-12-23 | 2011-07-06 | 天津大学 | Electronic control method of variable gas inlet and exhaust system of compression ignition engine |
| CN101418709B (en) * | 2008-10-09 | 2011-11-02 | 天津大学 | Distribution plate controlled two-mode engine valve timing changing system |
| WO2012012973A1 (en) * | 2010-07-30 | 2012-02-02 | 天津大学 | Hydraulic self-adaptation variable valve timing system for diesel engine and control method therefor |
| CN102536373A (en) * | 2010-12-08 | 2012-07-04 | 施瓦本冶金工程汽车有限公司 | Device for adjusting a rotation angle position of a camshaft |
| CN103277158A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Hydraulically flexibly driven valve mechanism |
| CN103388502A (en) * | 2013-07-31 | 2013-11-13 | 哈尔滨工程大学 | Full changeable electro-hydraulic air valve driving device |
| CN104421008A (en) * | 2013-09-10 | 2015-03-18 | 谢庆生 | Gas distribution phase and gas valve lift independent and continuous variable adjuster |
| CN104295333B (en) * | 2013-07-16 | 2017-02-22 | 张珊 | Engine valve mechanism |
-
2007
- 2007-12-04 CN CNA2007101507047A patent/CN101201009A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418709B (en) * | 2008-10-09 | 2011-11-02 | 天津大学 | Distribution plate controlled two-mode engine valve timing changing system |
| CN101526042B (en) * | 2008-12-23 | 2011-07-06 | 天津大学 | Electronic control method of variable gas inlet and exhaust system of compression ignition engine |
| RU2505683C2 (en) * | 2010-07-30 | 2014-01-27 | Тянь Цзинь Юниверсити | Self-adaptive hydraulic system with variable timing phases for diesel engine and method of its control |
| WO2012012973A1 (en) * | 2010-07-30 | 2012-02-02 | 天津大学 | Hydraulic self-adaptation variable valve timing system for diesel engine and control method therefor |
| CN101975098A (en) * | 2010-09-30 | 2011-02-16 | 哈尔滨工程大学 | Camless electrohydraulic variable valve timing system based on fuel medium |
| CN101975098B (en) * | 2010-09-30 | 2012-12-19 | 哈尔滨工程大学 | Camless electrohydraulic variable valve timing system based on fuel medium |
| CN102536373A (en) * | 2010-12-08 | 2012-07-04 | 施瓦本冶金工程汽车有限公司 | Device for adjusting a rotation angle position of a camshaft |
| CN102536373B (en) * | 2010-12-08 | 2014-10-22 | 施瓦本冶金工程汽车有限公司 | Device for adjusting a rotation angle position of a camshaft |
| US9200546B2 (en) | 2010-12-08 | 2015-12-01 | Schwabische Huttenwerke Automotive Gmbh | Device for adjusting the rotational angular position of a cam shaft |
| CN103277158A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Hydraulically flexibly driven valve mechanism |
| CN104295333B (en) * | 2013-07-16 | 2017-02-22 | 张珊 | Engine valve mechanism |
| CN103388502A (en) * | 2013-07-31 | 2013-11-13 | 哈尔滨工程大学 | Full changeable electro-hydraulic air valve driving device |
| CN103388502B (en) * | 2013-07-31 | 2016-01-27 | 哈尔滨工程大学 | A kind of full changeable electro-hydraulic air valve drive unit |
| CN104421008A (en) * | 2013-09-10 | 2015-03-18 | 谢庆生 | Gas distribution phase and gas valve lift independent and continuous variable adjuster |
| WO2015035859A1 (en) * | 2013-09-10 | 2015-03-19 | Xie Qingsheng | Regulator for independently and continuously variable valve timing and valve lift |
| CN104421008B (en) * | 2013-09-10 | 2018-08-14 | 谢庆生 | Port timing and valve stroke independence continuous variable adjuster |
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Open date: 20080618 |