CN104454158B - Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof - Google Patents
Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof Download PDFInfo
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- CN104454158B CN104454158B CN201410588012.0A CN201410588012A CN104454158B CN 104454158 B CN104454158 B CN 104454158B CN 201410588012 A CN201410588012 A CN 201410588012A CN 104454158 B CN104454158 B CN 104454158B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000002902 bimodal effect Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008278 dynamic mechanism Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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 Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a variable-stroke pneumatic internal combustion hybrid power engine and a running method of the variable-stroke pneumatic internal combustion hybrid power engine. The variable-stroke pneumatic internal combustion hybrid power engine comprises at least two air cylinders, each air cylinder is provided with a piston, a connecting rod and a crankshaft, and each air cylinder is provided with an exhaust valve, an inlet valve and a compressed air valve. The engine can achieve switching of engine strokes and four work modes through a mechanical structure, a switching mechanism is simple, the overall structure of the engine is more compact than other hybrid power modes, space is saved, and when the engine works in a two-stroke air compressor mode, brake energy recovery can be achieved, and the effect of saving energy can be achieved. Recovered brake energy is stored in an air tank, the reasonable engine work modes are selected according to different running work conditions, the hybrid power engine can be made to work in the optimal area, and the dynamic property, economical efficiency and the emission property achieve the more ideal state. The internal combustion engine work area adjusting function is achieved, an internal combustion engine can be made to work in the efficient area, and redundant power is used for recycling compressed air.
Description
Technical field
The present invention relates to a kind of power engine and its operation method, it is more particularly related to a kind of variable punching
Journey pneumatic internal combustion hybrid engine and its operation method.
Background technology
With deepening constantly for energy-saving and emission-reduction theme, auto industry is devoted to seeking energy-efficient new technology meeting
Increasingly strict Abgasgesetz.Pneumatic internal combustion mixed dynamical can reclaim internal-combustion engine residual energy using air motor, be to realize height
Imitate the beneficial way of low emission.Chinese patent [CN200710067863.0], Chinese patent [CN201020158252.4] and in
State's patent [201120165652.2] proposes the system model of pneumatic internal combustion hybrid engine, these patents or profit respectively
Air motor air inlet is heated with I. C. engine exhaust, improving compressed air to do work can use energy；Or I. C. engine exhaust is introduced pneumatic
Engine is expanded, and reclaims exhaust overbottom pressure；Or internal combustion engine is pressurized using compressed air, improve internal combustion engine transient response
And power per liter, but it is not directed to the recycling of engine braking energy.Because pneumatic motor is generally two stroke engine, and internal combustion
Machine is generally four-stroke engine, the design of existing pneumatic internal combustion mixed dynamical, need to be coupled the two, many complex structures,
And hybrid power system can not be made to remain operating in best region.
The content of the invention
It is an object of the invention to overcome deficiency of the prior art, there is provided one kind has engine mode concurrently, pneumatic starts
The pneumatic internal combustion mixed dynamical of stroke changeable of machine pattern, pneumatic internal combustion hybrid engine pattern and Brake energy recovery pattern
Engine and its operation method.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions：
Stroke changeable pneumatic internal combustion hybrid engine, including at least two cylinders, cylinder have piston, connecting rod and song
Axle, is respectively provided with exhaust valve, inlet valve and compressed air valve on described each cylinder；Compressed air valve sprays with compressed air
Air valve is connected, the compressed aerojet valve control of its opening and closing；Compressed air snifting valve by compressed air inlet pipe, stop valve and
Pressure regulating device is connected to an air accumulator；Exhaust valve and inlet valve are controlled by a changeable valve actuating mechanism；Valve drives
Motivation structure include the hydraulic tappet mechanism single double peak cam axle corresponding with hydraulic tappet mechanism, valve actuating push rod, valve rocker and
Rocker arm shaft；Hydraulic tappet mechanism includes hydraulic tappet, hydraulic fluid chamber and roller；Hydraulic tappet one end passes through hydraulic fluid chamber and roller
It is connected, the other end connects with valve actuating push rod bottom, and valve actuating push rod top is connected by rocker arm shaft with valve rocker one end, and valve shakes
The arm other end is connected with exhaust valve, inlet valve；Roller is corresponded with the cam of single double peak cam axle and connected；Hydraulic tappet mechanism
Hydraulic fluid chamber be connected with hydraulic tappet magnetic valve；The hydraulic pressure oil nozzle of compressed air snifting valve and compressed air snifting valve magnetic valve
It is connected.
Described single double peak cam axle is connected by chain or belt with bent axle, drives single double peak cam axle to revolve by bent axle
Turn.
Described compressed air snifting valve is connected via compressed air snifting valve magnetic valve with electrically controlled plunger pump, compressed air
The power source of snifting valve is provided by electrically controlled plunger pump, and lift is controlled with timing by electrically controlled plunger pump.
The hydraulic tappet mechanism of described valve actuating mechanism is connected via hydraulic tappet magnetic valve with electrically controlled plunger pump, by
The hydraulic fluid chamber pressurization and release of electrically controlled plunger pump control hydraulic tappet mechanism.
The operation method of described stroke changeable pneumatic internal combustion hybrid engine comprises the following steps：
1）The compressed air snifting valve of engine whole cylinder is in normally off, controls hydraulic tappet magnetic valve, makes
It is all the unimodal cam engagement state with single double peak cam axle, atomizer that hydraulic tappet mechanism is switched to inlet valve, exhaust valve
Normal oil spout, engine is worked with quartastroke engine pattern；
2）Electrically controlled plunger pump is adjusted to piston and run to after top dead center fuel feeding, the compressed air jet of engine whole cylinder
Valve opens jet on time, controls hydraulic tappet magnetic valve, make hydraulic tappet mechanism be switched to inlet valve normally off, exhaust valve with
The double peak cam engagement state of single double peak cam axle, atomizer is closed, and engine is worked with two-stroke air motor pattern；
3）Electrically controlled plunger pump is adjusted to piston and run to after top dead center fuel feeding, the compressed air jet of engine portion sub-cylinder
Valve opens jet on time, and hydraulic tappet mechanism is switched to inlet valve normally off, and exhaust valve is bimodal convex with single double peak cam axle
Wheel engagement state, atomizer is closed, and this partial cylinders is worked with two-stroke air motor pattern；The compression of remaining cylinders is empty
Gas blowout air valve is closed, and hydraulic tappet mechanism is switched to inlet valve, exhaust valve to be connected with the unimodal cam of single double peak cam axle
Conjunction state, the normal oil spout of atomizer, this partial cylinders are worked with quartastroke engine pattern；Engine is dynamic with the mixing of pneumatic internal combustion
Force engine pattern works；
4）Electric control plunger displacement pump is adjusted to piston and run to before upper dead canter fuel feeding, the compressed air snifting valve of cylinder
Open on time, now used as exhaust valve, the compressed air in cylinder enters air accumulator to compressed air valve by compressed air valve 1
It is interior and stored, hydraulic tappet magnetic valve is controlled, hydraulic tappet mechanism is switched to inlet valve double with single double peak cam axle
Peak cam engagement state, exhaust valve normally off, atomizer is closed, engine as a two-stroke air compressor, with
Brake energy recovery pattern works.
Compared with prior art, the beneficial effects of the invention are as follows：
1）This stroke changeable pneumatic internal combustion hybrid engine can by mechanical structure realize engine strokes with
And four kinds of switchings of mode of operation, simply, engine overall structure is compact compared with other hybrid forms for switching mechanism, saves empty
Between.
2）When hybrid power engine works in two-stroke air compressor form, it is possible to achieve Brake energy recovery, reach
To the effect of energy-conservation；The braking energy of recovery is stored in gas tank, can be used for air motor pattern or pneumatic internal combustion
Hybrid power engine pattern, realizes the recycling of energy.
3）Rational engine working mode is selected according to different operating conditions, can be operated in hybrid power engine
Best region, dynamic property economy and emission performance reach more preferably state.
4）Also there is internal combustion engine region to adjust function, internal combustion engine can be made in efficient region, and unnecessary power
For reclaiming compressed air.
Brief description of the drawings
Fig. 1 is the structural representation of stroke changeable pneumatic internal combustion hybrid engine；
Fig. 2 is the hydraulic tappet structure schematic diagram in valve actuating mechanism of the invention；
Fig. 3 is list double peak cam axle construction schematic diagram corresponding with hydraulic tappet of the invention；
Reference is in figure：1 compressed air snifting valve；2 exhaust valves；3 inlet valves；4 valve rockers；5 valves are pushed away
Bar；6 pistons；7 connecting rods；8 hydraulic tappet mechanisms；9 single double peak cam axles；10 hydraulic tappet magnetic valves；11 bent axles；12
Compressed air snifting valve magnetic valve；13 compressed air valves；14 compressed air inlet pipes；15 hydraulic tappets；16 hydraulic oil
Chamber；17 rollers.
Specific embodiment
Firstly, it is necessary to explanation, the internal combustion engine form in the present invention can be gasoline engine, diesel engine and natural gas hair
Motivation etc..Below will be by taking diesel engine as an example, with reference to accompanying drawing, the present invention will be described in detail.
Stroke changeable pneumatic internal combustion hybrid engine structure is as shown in Figure 1 to Figure 3 in the present embodiment.
Stroke changeable pneumatic internal combustion hybrid engine, including at least two cylinders, cylinder have piston 6, the and of connecting rod 7
Bent axle 11, is respectively provided with exhaust valve 2, inlet valve 3 and compressed air valve 13 on described each cylinder；Compressed air valve 13 with
Compressed air snifting valve 1 is connected, and its compressed aerojet valve 1 of opening and closing is controlled；Compressed air snifting valve 1 is entered by compressed air
Tracheae 14, stop valve and pressure regulating device are connected to an air accumulator；Exhaust valve 2 and inlet valve 3 are driven by a changeable valve
Dynamic mechanism controls；Valve actuating mechanism includes the single double peak cam axle corresponding with hydraulic tappet mechanism 8 of hydraulic tappet mechanism 8
9th, valve actuating push rod 5, valve rocker 4 and rocker arm shaft；Hydraulic tappet mechanism 8 includes hydraulic tappet 15, hydraulic fluid chamber 16 and roller 17；
The one end of hydraulic tappet 15 is connected 17 with roller by hydraulic fluid chamber 16, and the other end connects with the bottom of valve actuating push rod 5, valve actuating push rod 5
Top is connected by rocker arm shaft with the one end of valve rocker 4, and the other end of valve rocker 4 is connected with exhaust valve 2, inlet valve 3；Roller 17
Corresponded with the cam of single double peak cam axle 9 and connected；The hydraulic fluid chamber 16 of hydraulic tappet mechanism 8 and hydraulic tappet magnetic valve 10
It is connected；The hydraulic pressure oil nozzle of compressed air snifting valve 1 is connected with compressed air snifting valve magnetic valve 12.
Described single double peak cam axle 9 is connected by chain or belt with bent axle 11, and single double peak cam is driven by bent axle 11
Axle 9 rotates.
Described compressed air snifting valve 1 is connected via compressed air snifting valve magnetic valve 12 with electrically controlled plunger pump, compression
The power source of aerojet valve 1 is provided by electrically controlled plunger pump, and lift is controlled with timing by electrically controlled plunger pump.
The hydraulic tappet mechanism 8 of described valve actuating mechanism is via hydraulic tappet magnetic valve 10 and electrically controlled plunger pump phase
Even, pressurizeed and release by the hydraulic fluid chamber 16 of electrically controlled plunger pump control hydraulic tappet mechanism 8.
The method of operation that the pneumatic internal combustion mixed dynamical of stroke changeable starts in the present embodiment is as follows：
Pattern one：
Engine is in engine mode.Now, the bypass of compressed air snifting valve magnetic valve 12 release, engine whole gas
The compressed air snifting valve 1 of cylinder is in normally off, and control hydraulic tappet magnetic valve 10 is switched to hydraulic tappet mechanism 8
Inlet valve 3, exhaust valve 2 are all the unimodal cam engagement state with single double peak cam axle 9, the normal oil spout of atomizer, engine
Worked with quartastroke engine pattern.
Pattern two：
Engine is in air motor pattern.Now, electrically controlled plunger pump is adjusted to piston 6 to run to after top dead center and supplied
Oil, the compressed air snifting valve 1 of engine whole cylinder opens jet on time, and the compressed air in air accumulator passes through compressed air
Valve 13 is sprayed into cylinder, control hydraulic tappet magnetic valve 10, hydraulic tappet mechanism 8 is switched to the normally off of inlet valve 3, is arranged
The double peak cam engagement state of valve 2 and single double peak cam axle 9, atomizer is closed, and engine is with two-stroke air motor
Pattern works.
Pattern three：
Engine is in pneumatic internal combustion hybrid engine pattern.Electrically controlled plunger pump is adjusted to piston 6 and runs supreme stopping
Fuel feeding after point, the compressed air snifting valve 1 of engine portion sub-cylinder opens jet on time, and the compressed air in air accumulator is by pressure
Contracting air valve 13 is sprayed into cylinder, and hydraulic tappet mechanism 8 is switched to the normally off of inlet valve 3, exhaust valve 2 and single double peak cam
The double peak cam engagement state of axle 9, atomizer is closed, and this partial cylinders is worked with two-stroke air motor pattern；Remaining
The compressed air snifting valve 1 of cylinder is closed, and hydraulic tappet mechanism 8 is switched to inlet valve 3, exhaust valve 2 is all and single double peak cam
The unimodal cam engagement state of axle 9, the normal oil spout of atomizer, this partial cylinders are worked with quartastroke engine pattern；Start
Machine is worked with pneumatic internal combustion hybrid engine pattern.
Pattern four：
Engine is in Brake energy recovery pattern.Now electric control plunger displacement pump is adjusted to piston 6 and run to before upper dead canter
Fuel feeding, the compressed air snifting valve 1 of cylinder is opened on time, and now compressed air valve 1 is used as exhaust valve, the pressure in cylinder
Contracting air is entered in air accumulator and stored by compressed air valve 1, control hydraulic tappet magnetic valve 10, makes hydraulic tappet
Mechanism 8 is switched to the double peak cam engagement state of inlet valve 3 and single double peak cam axle 9, and exhaust valve normally off, atomizer is closed
Close, engine is worked as a two-stroke air compressor with Brake energy recovery pattern.
Claims (4)
1. a kind of stroke changeable pneumatic internal combustion hybrid engine, including at least two cylinders, cylinder has piston（6）, even
Bar（7）And bent axle（11）, it is characterised in that it is respectively provided with exhaust valve on described each cylinder（2）, inlet valve（3）It is empty with compression
Gas valve（13）；Compressed air valve（13）With compressed air snifting valve（1）It is connected, its compressed aerojet valve of opening and closing（1）
Control；Compressed air snifting valve（1）By compressed air inlet pipe（14）, stop valve and pressure regulating device be connected to a gas storage
Tank；Exhaust valve（2）And inlet valve（3）Controlled by a changeable valve actuating mechanism；Valve actuating mechanism is endured including hydraulic pressure
Post mechanism（8）With hydraulic tappet mechanism（8）Corresponding single double peak cam axle（9）, valve actuating push rod（5）, valve rocker（4）With
Rocker arm shaft；Hydraulic tappet mechanism（8）Including hydraulic tappet（15）, hydraulic fluid chamber（16）And roller（17）；Hydraulic tappet（15）One
End passes through hydraulic fluid chamber（16）With roller（17）It is connected, the other end and valve actuating push rod（5）Bottom connects, valve actuating push rod（5）Top
By rocker arm shaft and valve rocker（4）One end is connected, valve rocker（4）The other end and exhaust valve（2）, inlet valve（3）It is connected；Rolling
Son（17）With single double peak cam axle（9）Cam correspond connect；Hydraulic tappet mechanism（8）Hydraulic fluid chamber（16）With hydraulic pressure
Tappet magnetic valve（10）It is connected；Compressed air snifting valve（1）Hydraulic pressure oil nozzle and compressed air snifting valve magnetic valve（12）It is connected；
Described compressed air snifting valve（1）Via compressed air snifting valve magnetic valve（12）It is connected with electrically controlled plunger pump, compressed air
Snifting valve（1）Power source provided by electrically controlled plunger pump, lift controls with timing by electrically controlled plunger pump.
2. stroke changeable pneumatic internal combustion hybrid engine according to claim 1, it is characterised in that described Dan Shuan
Peak camshaft（9）By chain or belt and bent axle（11）Connection, by bent axle（11）Drive single double peak cam axle（9）Rotation.
3. stroke changeable pneumatic internal combustion hybrid engine according to claim 1 and 2, it is characterised in that described gas
The hydraulic tappet mechanism of door drive mechanism（8）Via hydraulic tappet magnetic valve（10）It is connected with electrically controlled plunger pump, by automatically controlled plunger
Pump control hydraulic tappet mechanism（8）Hydraulic fluid chamber（16）Pressurization and release.
4. a kind of operation method of stroke changeable pneumatic internal combustion hybrid engine as claimed in claim 1, its feature exists
In comprising the following steps：
1）The compressed air snifting valve of engine whole cylinder（1）Normally off is in, hydraulic tappet magnetic valve is controlled（10）,
Make hydraulic tappet mechanism（8）It is switched to inlet valve（3）, exhaust valve（2）All it is and single double peak cam axle（9）Unimodal cam connect
Conjunction state, the normal oil spout of atomizer, engine is worked with quartastroke engine pattern；
2）Electrically controlled plunger pump is adjusted to piston（6）Run to after top dead center fuel feeding, the compressed air jet of engine whole cylinders
Valve（1）Jet is opened on time, controls hydraulic tappet magnetic valve（10）, make hydraulic tappet mechanism（8）It is switched to inlet valve（3）It is normally closed
State, exhaust valve（2）With single double peak cam axle（9）Double peak cam engagement state, atomizer close, engine is with two-stroke
Air motor pattern works；
3）Electrically controlled plunger pump is adjusted to piston（6）Run to after top dead center fuel feeding, the compressed air jet of engine portion sub-cylinder
Valve（1）Jet, hydraulic tappet mechanism are opened on time（8）It is switched to inlet valve（3）Normally off, exhaust valve（2）It is bimodal convex with single
Wheel shaft（9）Double peak cam engagement state, atomizer close, this partial cylinders with two-stroke air motor pattern work；
The compressed air snifting valve of remaining cylinders（1）Close, hydraulic tappet mechanism（8）It is switched to inlet valve（3）, exhaust valve（2）All it is
With single double peak cam axle（9）Unimodal cam engagement state, the normal oil spout of atomizer, this partial cylinders is with quartastroke engine
Pattern works；Engine is worked with pneumatic internal combustion hybrid engine pattern；
4）Electric control plunger displacement pump is adjusted to piston（6）Run to before upper dead canter fuel feeding, the compressed air snifting valve of cylinder
（1）Open on time, now compressed air valve（13）Used as exhaust valve, the compressed air in cylinder passes through compressed air valve（13）
Enter in air accumulator and stored, control hydraulic tappet magnetic valve（10）, make hydraulic tappet mechanism（8）It is switched to inlet valve
（3）With single double peak cam axle（9）Double peak cam engagement state, exhaust valve normally off, atomizer close, engine conduct
One two-stroke air compressor, is worked with Brake energy recovery pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588012.0A CN104454158B (en) | 2014-10-29 | 2014-10-29 | Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588012.0A CN104454158B (en) | 2014-10-29 | 2014-10-29 | Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof |
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| Publication Number | Publication Date |
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| CN104454158A CN104454158A (en) | 2015-03-25 |
| CN104454158B true CN104454158B (en) | 2017-05-24 |
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| CN201410588012.0A Active CN104454158B (en) | 2014-10-29 | 2014-10-29 | Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106930830B (en) * | 2015-12-29 | 2020-07-03 | 长城汽车股份有限公司 | Mode switching method and system of multi-stroke cycle engine and vehicle |
| CN105604633B (en) * | 2016-03-02 | 2018-07-13 | 乔云锦 | Automobile and tractor engine valve energy conserving system |
| CN107939472B (en) * | 2017-10-17 | 2023-10-27 | 浙江大学 | Two-stroke compression release type braking device of integrated engine and braking method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887612A (en) * | 2006-07-06 | 2007-01-03 | 刘冬生 | Pneumatic and oil-burning mixed powder vehicle |
| CN102042128A (en) * | 2009-10-16 | 2011-05-04 | 大连理工大学 | Engine with air supply devices |
| CN202100326U (en) * | 2011-05-23 | 2012-01-04 | 浙江大学 | Pneumatic internal combustion hybrid engine |
| CN202300564U (en) * | 2011-11-15 | 2012-07-04 | 浙江大学 | Braking energy recovery system based on compressed air circulation of engine |
-
2014
- 2014-10-29 CN CN201410588012.0A patent/CN104454158B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887612A (en) * | 2006-07-06 | 2007-01-03 | 刘冬生 | Pneumatic and oil-burning mixed powder vehicle |
| CN102042128A (en) * | 2009-10-16 | 2011-05-04 | 大连理工大学 | Engine with air supply devices |
| CN202100326U (en) * | 2011-05-23 | 2012-01-04 | 浙江大学 | Pneumatic internal combustion hybrid engine |
| CN202300564U (en) * | 2011-11-15 | 2012-07-04 | 浙江大学 | Braking energy recovery system based on compressed air circulation of engine |
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