CN106285966B - The engine braking methods slow for vehicle - Google Patents
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- CN106285966B CN106285966B CN201510238880.0A CN201510238880A CN106285966B CN 106285966 B CN106285966 B CN 106285966B CN 201510238880 A CN201510238880 A CN 201510238880A CN 106285966 B CN106285966 B CN 106285966B
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Abstract
The engine braking methods slow for vehicle, engine is run under desired speed (in especially, the slow-speed of revolution), the pressure at expulsion of engine is adjusted by exhaust current-limiting apparatus (such as turbocharger and exhaust butterfly valve), control the temperature of engine, and the medium of predetermined amount is sprayed into the cylinder of engine or in exhaust pipe, the resistance of motion for increasing in-cylinder pressure and engine piston, to improve the formulation power of engine.When the medium sprayed into is fuel oil, burning of the fuel oil during the compression stroke of engine is controlled, the formulation power of in-cylinder pressure and engine is further increased.The present invention solves the problems, such as in engine in the prior art, braking power is too low when the slow-speed of revolution, it reduces and even avoids high-revolving engine braking, the failure modes such as high revolving speed braking bring top load and high row's temperature are eliminated, the reliability and durability of engine braking running are improved.
Description
Technical field:
The present invention relates to machinery field more particularly to engine arts, engine braking especially slow for vehicle
Method.
Background technique:
In prior art, the application of vehicle motor has long history, and the conventional ignition running of engine is that people is ripe
Know.For example, four-stroke diesel engine operates repeatedly according to the period, have in each period induction stroke, compression stroke,
Expansion (or workmanship) stroke and exhaust stroke.In the intake stroke, the piston of engine is in cylinder from top dead centre toward lower dead center
The inlet valve of movement, engine is opened, and the cylinder of engine is introduced air into.Followed by compression stroke, piston is from lower dead center
It is moved toward top dead centre, all in closed state, the air in cylinder is compressed for the intake and exhaust valves of engine, is arrived in piston
Near top dead center, diesel oil, which sprays into cylinder, to be mixed with compressed air and expands spontaneous combustion in (or workmanship) stroke next,
Gas expansion is generated, piston is driven from top dead centre toward lower dead center and is done manual work.Finally the exhaust stroke of engine, piston again from
Lower dead center is moved toward top dead centre, and the exhaust valve of engine is opened, and the gas after burning is discharged in exhaust pipe out of cylinder, is passed through
Enter offgas duct after post-processing to be discharged in atmosphere.
Engine braking technology is also well-known, and the engine for generating power only need to be temporarily converted to the sky for absorbing energy
Press.Fuel oil is cut off in conversion process, other than conventional inlet and outlet door is opened during inlet and outlet stroke, in engine
Piston compression stroke exhaust valve at the end of is again turned on, and is allowed to be released by compressed gas (being air when braking), be started
The energy that machine compressed gas in compression stroke is absorbed, cannot subsequent expansion stroke return to engine piston, and
It is to be discharged by the exhaust and cooling system of engine.It is final the result is that effective engine braking, slows down the speed of vehicle
Degree.
One precedent of engine braking technology is the U.S. Patent number US 3220392 provided by comings (Cummins)
(1965) it discloses, the invention of the patent utilizes hydraulic pressure transfer, and the movement of injection cam or neighbouring exhaust cam is passed to and is started
The valve of machine increases the exhaust of compression release braking near on the basis of the movement of engine conventional valve
Door movement.The invention cuts off fuel oil during braking running.
Due to cutting off fuel oil during engine braking, without work by combustion, existing engine brake is not by certainly
Oneself energy production braking, but it is a kind of passively, by the anti-device for dragging engine to do negative work of vehicle movement, therefore braking power
It is directly proportional to engine speed.The engine of commercial vehicle is in, the braking power of the slow-speed of revolution (1100 arrive 1500rpm) is far below height
The braking power of revolving speed (2100 arrive 2500rpm).And in these vehicle drivings most common engine speed exactly in, it is low
Revolving speed.Therefore, it is necessary to improve engine in, the braking power of the slow-speed of revolution.
Shipping company, Na Weisidawan state (Navistar International Transportation Corp.) is in beauty
State's patent 5634447 (1997) discloses a kind of engine braking methods, sprays a small amount of fuel oils during engine braking
Enter that a turbocharging, cold engine increases the braking power of engine without in.In the compression far from (advanced) top dead-centre
A small amount of fuel oil is sprayed into during stroke into the cylinder of engine.This small amount of fuel burning, promoted compression during cylinder pressure and
The energy of turbocharger, to increase braking power.However, when engine has intercooler (air-air), sucking
The air themperature of engine substantially reduces, and such Cryogenic air is stranded the combustion zone of the fuel oil sprayed into during engine braking
Difficulty is lighted even more extremely difficult especially in cold weather, when be in engine is in, the slow-speed of revolution.8th class heavy truck
All have intercooler (air-air), and in, the slow-speed of revolution is when being exactly that this truck is maximum to engine brake power demand
It waits.
Mack Trucks (Mack Trucks, Inc.) discloses one kind at United States Patent (USP) 6337447 (2002)
Similar engine braking methods, during engine braking by one turbocharging of (5 milligrams/stroke) of a small amount of fuel oils penetratings,
Cold engine increases the braking power of engine in band.During engine braking, in order to avoid intercooler is to air
Cooling, the compressed air come out from turbocharger bypasses intercooler, and the cylinder of engine is directly entered from bypass pipe.Such cylinder
Interior temperature is higher, is conducive to the burning of fuel oil sprayed into advance.But, from the point of view of the test data of the patent disclosure, in, it is low
The engine brake power of revolving speed (1500rpm or less) increases very little or absolutely not changes.This is indicated that, in engine
When the slow-speed of revolution, fuel oil does not have full combustion or does not burn at all.In addition, many engines start in addition to configuration compression-release
Except brake, it is also equipped with exhaust brake, such as the pressure at expulsion tune of exhaust butterfly valve and European Volvo in Chinese market
Save the exhaust such as device (EPR) current-limiting apparatus.Once exhaust brake starting (air-flow in limitation exhaust pipe), the work of turbocharger
With reduction even wholly without air inlet greatly reduces, and intercooler does not almost work.
In fact, Mack Trucks (Mack Trucks, Inc.) is in No. 6283091 (2001) disclosures of United States Patent (USP)
When Associated brake (engine compression brake is used together with exhaust brake), the temperature of engine can be high in the extreme, special
It is not at high revolving speed (2000 revs/min or more), the delivery temperature of engine is up to 12000F(6490C), cylinder temperature is up to
7510F(3990C).This engine overheat generated by Associated brake will lead to that fuel nozzle is sharp-tongued to be burnt out, therefore propose
(1 ~ 30 milligram/stroke) sharp-tongued invention of cooling fuel nozzle of small bursts fuel oil during engine braking.
Summary of the invention:
The purpose of the present invention is to provide the engine braking methods slow for vehicle, the method will solve existing
Engine braking will especially solve to send out in the prior art in, braking power too low technical problem when the slow-speed of revolution in technology
Motivation is braked in, engine temperature is too low when the slow-speed of revolution, insufficient technical problem can not be lighted or be burnt to fuel oil, and there are also send out
In high revolving speed, engine temperature is too high for motivation braking, fuel nozzle sharp-tongued the technical issues of burning out.
A kind of engine braking methods slow for vehicle of the invention the following steps are included:
1. engine is run under scheduled revolving speed,
2. the pressure at expulsion of engine is adjusted,
3. the temperature of engine is controlled,
4. the piston in the engine cylinder reach toward the top dead centre movement of compression stroke, compression gas in the jar make a reservation for it is high
When temperature, to the fuel oil of vapour cylinder injection predetermined amount,
5. the fuel oil is allowed to burn during compression stroke, increase the pressure and temperature in cylinder,
6. open exhaust valve before the top dead centre that piston arrives at compression stroke, discharges and compressed and burnt in cylinder
Gas.
Further, the step of pressure at expulsion of the adjusting engine includes one of following processes or their group
It closes:
1. adjusting the pressure at expulsion of engine using turbocharger, the turbocharger includes variable turbine pressurization
Machine,
2. using the pressure at expulsion of exhaust throttle valve regulation engine, the exhaust shutter includes exhaust butterfly valve,
3. adjusting the pressure at expulsion of engine using exhaust gas recycling system, the exhaust gas recycling system includes interior row
Gas recirculating system and outer exhaust gas recycling system.
Further, the interior exhaust gas recycling system adopts one of following processes or their combination:
1. also opening the exhaust of engine during the induction stroke of engine other than conventional IO Intake Valve Opens
Door,
2. also opening the air inlet of engine during the exhaust stroke of engine other than conventional exhauxt valve opens
Door.
Further, the step of temperature of the control engine includes controlling one of following temperature or their group
It closes:
1. the cylinder temperature of engine,
2. the delivery temperature of engine,
3. the oil temperature of engine, and
4. the cooling water temperature of engine.
Further, the predetermined amount of the fuel oil to vapour cylinder injection is determined by one of following parameters or their combination
It is fixed:
1. the temperature of engine,
2. the revolving speed of engine, and
3. the load limitation of engine braking.
Further, the fuel oil of the predetermined amount sprays into the cylinder of engine before the opening exhaust valve.
Further, the high temperature that makes a reservation for reached in cylinder by compressed gas is determined by the burning point of fuel oil.
Further, the fuel oil includes diesel oil.
Another kind of the invention is for the slow engine braking methods of vehicle, it is characterised in that: the method includes
Following steps:
1. engine is run under scheduled revolving speed,
2. the pressure at expulsion of engine is adjusted,
3. opening the exhaust valve of engine during the conventional admission door of engine is opened, allow in the exhaust pipe of engine
The cylinder of gas return engine,
4. the gas mixing in the gas and cylinder that return in exhaust pipe is improved into the combustibility of gas in the jar,
5. when mixed gas of the piston in engine cylinder in the top dead centre movement of compression stroke, compression cylinder reaches pre-
When fixed high temperature, to the fuel oil of vapour cylinder injection predetermined amount,
6. allowing the fuel oil in in-cylinder combustion, increase the pressure and temperature in cylinder,
7. open exhaust valve before the top dead centre that piston arrives at compression stroke, discharges and compressed and burnt in cylinder
Gas.
Another of the invention is for the slow engine braking methods of vehicle, it is characterised in that: the method includes
Following steps:
1. engine is run under scheduled revolving speed,
2. spraying into predetermined amount into the cylinder of engine when near the lower dead center that the piston of engine arrives at induction stroke
Medium, increase in-cylinder pressure,
3. increase the resistance that piston moves in compression stroke toward top dead centre,
4. open exhaust valve before the top dead centre that piston arrives at compression stroke, discharge in cylinder gas compressed and
Medium.
Further, the medium injected into cylinder includes one of following fluids or their combination:
1. gas, the gas includes air,
2. liquid, the liquid includes water and fuel oil.
Another the of the invention engine braking methods slow for vehicle, comprising the following steps:
1. engine is run under scheduled revolving speed,
2. the pressure in the exhaust pipe of engine is adjusted by exhaust current-limiting apparatus,
3. the air of predetermined amount is sprayed into exhaust pipe,
4. open exhaust valve when near the lower dead center that the piston of engine arrives at induction stroke, gas in exhaust pipe is allowed
The cylinder of body return engine increases in-cylinder pressure,
5. increase the resistance that piston moves in compression stroke toward top dead centre,
6. opening exhaust valve before the top dead centre that piston arrives at compression stroke, dischargeing gas compressed in cylinder.
Further, the exhaust current-limiting apparatus includes one of following systems or their combination:
1. turbocharger, the turbocharger includes variable turbo supercharger,
2. exhaust shutter, the exhaust shutter includes exhaust butterfly valve.
Further, the air of the penetrating exhaust pipe is provided by a jet mechanism, and the jet mechanism includes
Air compressor, jet pipe and snifting valve, the jet pipe is by the exhaust pipe of the outlet of air compressor and engine
Connection, the snifting valve are arranged in the outlet of air compressor or on jet pipes.
Further, the engine desired speed is between 1000 revs/min to 2000 revs/min.
Further, the engine desired speed is between 1200 revs/min to 1500 revs/min.
Further, the engine braking includes four-stroke engine braking.
Further, the engine braking includes two-cycle engine braking.
The working principle of the invention is: when engine braking, especially in engine, when slow-speed of revolution braking, to
Certain medium is sprayed into the cylinder of engine or in exhaust pipe, increases pressure in cylinder, so that the piston of engine is rushed in compression
The resistance of motion in journey increases, to increase the formulation power of engine.When the medium of penetrating is fuel oil, started by adjusting
The pressure at expulsion of machine controls the temperature of engine, enables the fuel oil sprayed into cylinder full combustion during compression stroke,
Generate bigger piston motion resistance and engine brake power.
The present invention is compared with prior art, and effect is positive and apparent.The present invention substantially increases in engine, is low
The braking power of revolving speed (vehicle motor actual use in normal revolution) reduces even to avoid and high-revolving starts mechanism
It is dynamic, the failure modes such as high revolving speed braking bring top load and high row's temperature are eliminated, the reliable of engine braking running is improved
Property and durability.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of conventional four-stroke engine.
The schematic diagram of valve stroke when Fig. 2 is conventional four-stroke engine igniting running.
Fig. 3 a to Fig. 3 f is that the piston of engine in the embodiment of engine braking methods of the invention is different in the cylinder
The unlatching of engine valve, the flowing of gas and fuel-injected schematic diagram when position.
Fig. 4 is the schematic diagram of valve stroke of the four-stroke engine in compression release braking.
Fig. 5 is the schematic diagram of valve stroke adopted in the embodiment of the engine braking methods in the present invention.
Fig. 6 be in another embodiment of engine braking methods of the invention jet mechanism in the exhaust pipe of engine
The schematic diagram of gas supply.
Specific embodiment:
Embodiment 1:
Fig. 1 and Fig. 2 is used to describe the igniting running of conventional four-stroke engine.General engine has multiple cylinders,
For example the engine in commercial vehicle is the diesel engine of six-in-line.But for brevity, Fig. 1 and Fig. 2 illustrate only one
The movement of the valve of the cylinder of a engine and the cylinder in one cycle.The piston 33 of engine does past up and down in cylinder 35
Multiple periodic motion.As described above, each period of motion of four-stroke engine includes induction stroke, compression stroke, expansion
(or workmanship) stroke and exhaust stroke.In the intake stroke, the engine piston 33 in Fig. 1 is in cylinder 35 from exhaust top dead center
(360 ° in Fig. 2) are opened, are generated in Fig. 2 toward the movement of (540 ° in Fig. 2) of air inlet lower dead center, the inlet valve 200 of engine
Inlet valve molded line 321 introduces air into the cylinder 35 of engine.Followed by compression stroke, piston 33 is past from air inlet lower dead center
Compression top center (720 ° in Fig. 2 or 0 °) movement, the inlet valve 200 and exhaust valve 300 of engine are all in closed state, vapour
Air in cylinder 35 is compressed, piston 33 arrive near when, fuel oil (such as diesel oil) spray into cylinder in compressed
Air mixing and burnt in next expansion (or workmanship) stroke explosive, generate gas expansion, from compression only by piston 33
Point is toward (180 ° in Fig. 2) driving workmanships of expansion bottom dead center.Period be finally engine exhaust stroke, piston 33 is from expansion
Lower dead center is moved toward exhaust top dead center, and the exhaust valve 300 of engine is opened, and is generated the exhaust valve molded line 220 in Fig. 2, will be burnt
Gas afterwards is discharged to exhaust pipe 22 out of cylinder 35.Notice the unlatching of the inlet and outlet door of engine be not exclusively limited in into,
Within exhaust stroke, such as in exhaust top dead center, the unlatching of inlet and outlet door has overlapping.Variable valve actuation prevailing at present, is removed
Except the height of control valve opening, the shut-in time of the main opening time for adjusting exhaust valve and inlet valve, reaches and start
The high efficiency and low emission of machine running.
Existing engine is equipped with greatly turbocharger 2 shown in FIG. 1, to improve the power and efficiency of engine.
The turbine 6 for the exhaust gas-driven turbine supercharger 2 being discharged from the exhaust pipe of engine 22, drives coaxial air compressor machine 4, improves air inlet pipe
Admission pressure in 8.Since the temperature of compressed air increases, reduce the efficiency of engine, thus compressed air into
It is cooling by intercooler 12 before the cylinder 35 for entering engine, cylinder 35 is then entered by air inlet pipe 18 and inlet valve 200.This
Outside, the generally each cylinder of existing engine is equipped with four valves, two inlet valves, two exhaust valves, shows in Fig. 1 single
Inlet valve 200 and single exhaust valve 300 are signal effect.
One embodiment of engine braking methods of the invention can be illustrated by the schematic diagram of Fig. 3 a to Fig. 3 f.
Compared with the structure of the conventional four-stroke engine in Fig. 1, engine brake is increased in Fig. 3 a to Fig. 3 f of the present embodiment
100 and exhaust brake 28.Engine brake 100 acts on exhaust valve 300, generates braking exhaust valve liter as shown in Figure 4
Journey curve 232.It is constant to notice that the exhaust valve lift profile 220 of conventional ignition running and inlet valve lifting curve 321 retain.System
The height of dynamic exhaust valve lift profile 232 and period are much smaller than the exhaust valve lift profile 220 for running of lighting a fire.Conventional exhaust system
Dynamic device 28 includes exhaust current-limiting apparatus, such as exhaust butterfly valve and other exhaust shutters here, is connected to by exhaust pipe 26
It (can also be placed in front of turbine 6) behind turbine 6.In fact, turbocharger 2, especially more and more common use
Variable turbo supercharger, have the function of be vented current-limiting apparatus, can be used alone, or shared with exhaust brake 28,
And they can be operated by the control module (ECU) of engine, control the pressure at expulsion of engine.
The operation of one embodiment of engine braking methods of the invention is as follows.By engine in desired speed
Lower operation, the range of the braked speed of heavy truck engine are usually 1000 to 2000 revs/min, the engine braking of most common of them
Revolving speed is 1200 to 1500 revs/min.It is the induction stroke in engine braking cycles shown in Fig. 3 a, the piston 33 of engine exists
It is moved in cylinder 35 from exhaust top dead center toward air inlet lower dead center, the inlet valve 200 of engine is opened, and conventional inlet valve liter is generated
Journey (conventional admission door lifting curve 321 shown in Fig. 5), introduces air into the cylinder 35 of engine.Piston 33 close into
When gas lower dead center (Fig. 3 b), engine brake 100 opens the exhaust valve 300 of engine, generates exhaust as shown in Figure 5 again
Recycle the exhaust valve lift profile 233 of (EGR).Pass through the perhaps exhaust brake 28 or two of the turbocharger 2 in Fig. 3 b
The pressure at expulsion of engine is adjusted in the combination of person, so that the pressure in exhaust pipe 22 is higher than the pressure in cylinder 35, row
Exhaust gas in tracheae 22 returns to cylinder 35 by the exhaust valve 200 opened, and controls temperature (including the delivery temperature, cylinder of engine
Interior temperature, oil temperature and cooling water temperature), help to improve the pressure, temperature and combustibility of gas in the jar.Next
In compression stroke, piston 33 is moved from air inlet lower dead center toward compression top center, and the inlet valve 200 and exhaust valve 300 of engine are all
It is in close state, the air in cylinder 35 is compressed.Reach in gas compressed and makes a reservation for (such as the combustion of fuel oil of high temperature
Point) when, by fuel injector 500 to the fuel oil (Fig. 3 c) of vapour cylinder injection predetermined amount.Fuel oil spontaneous combustion in high pressure and high-temperature gas
Or pass through spark ignition combustion.The burning of gas further increases pressure in cylinder and temperature and piston is past in compression stroke
The resistance of top dead centre movement, the braking power of engine increase with it.When piston 33 is close to compression top center as shown in Figure 3d
When, engine braking mechanism 100 again opens exhaust valve 300, and the exhaust valve lift for generating compression release as shown in Figure 5 is bent
Line 232 discharges the gas for being compressed and being burnt in cylinder 35.In next expansion stroke as shown in Figure 3 e, piston
33 move from compression top center toward expansion bottom dead center, but due to the pressure of the not no gas above of piston 33, no normal direction engine
Crankshaft acting.Engine braking cycles are finally exhaust strokes as illustrated in figure 3f, and piston 33 is from expansion bottom dead center toward exhaust
Top dead centre movement, the exhaust valve 300 of engine open (typical wastegate lifting curve 220 shown in Fig. 5), piston 33 already
It needs that pressure at expulsion is overcome up to move, further increases braking power.
The exhaust valve 300 that engine is opened during the exhaust stroke of engine described above generates as shown in Figure 5
The exhaust gas recirculatioon of exhaust valve lift profile 233 is interior exhaust gas recirculatioon (iEGR), and interior exhaust gas recirculatioon, which can also be, is starting
The inlet valve 200 of engine is opened during the exhaust stroke of machine, furthermore the function of interior exhaust gas recirculatioon is also possible to pass through outlet
Gas recycles (eEGR) Lai Shixian.
In addition, engine in compression stroke to the predetermined amount of vapour cylinder injection fuel oil by one of following parameters or they
Combination determine: temperature (especially cylinder temperature), the revolving speed of engine and the brake load limit of engine of engine.Such as
Fruit cylinder temperature is too low or burning point of fuel oil is too high, and full combustion will be unable to by spraying into too many fuel oil；If too many fuel oil produces
Raw excessive in-cylinder pressure, brake load will overstep the extreme limit；And the temperature (including in-cylinder pressure) and brake load of engine with
The revolving speed of engine is closely related.
In addition, the fuel oil of predetermined amount described above sprays into the cylinder of engine preferably before opening exhaust valve, in order to avoid
Unburned fuel oil is retained in cylinder.
Embodiment 2:
Second difference between embodiment and one embodiment of engine braking methods of the invention with this reality
That applies that example sprays into engine cylinder not only has fuel oil, further includes other gases or liquid medium, such as air and water.Although
The air and water of penetrating cannot burn, but be likely to increase the resistance that pressure and piston in cylinder are moved toward top dead centre, from
And increase the braking power of engine.If cylinder temperature is sufficiently high, the water of penetrating is possible to become steam and increase cylinder
Interior pressure.
The course of work of the present embodiment is similar with one embodiment, no longer repeats herein.
Embodiment 3:
The difference of the present embodiment and above-mentioned first or second embodiments is the present embodiment not and is the vapour directly to engine
Cylinder injection medium, but air is injected into the exhaust pipe of engine, then pass through the row pressure of regulation engine and opening row
Valve will inject the cylinder of the indentation engine of the air in exhaust pipe.
The operation of the engine braking methods of the present embodiment can be illustrated by Fig. 6.Compared with first embodiment,
Embodiment adds a jet mechanism, air pressure is configured on the diesel engine including the general commercial vehicle of air compressor 41(
Contracting machine), jet pipe 43 and snifting valve 45.Jet pipe 43 is by the exhaust pipe 22 of the one outlet of air compressor and engine
Connection, and snifting valve 45 is arranged in the outlet of air compressor or on jet pipe 43.When engine is under desired speed
When operation, pass through exhaust current-limiting apparatus (combination of turbocharger 2 or exhaust brake 28, or both in Fig. 6) limit
Extraction flow processed adjusts the pressure in the exhaust pipe of engine 22；The sky of predetermined amount is sprayed into exhaust pipe 22 by air-jet device
Gas；When the piston 33 of engine is close to the lower dead center of induction stroke as shown in FIG. 6, opened by engine braking mechanism 100
Exhaust valve 300 allows the gas in exhaust pipe 22 to be pressed into the cylinder 35 of engine (pressure at expulsion is greater than in-cylinder pressure at this time), increases
Add in-cylinder pressure.In this way, increasing piston 33 in next compression stroke toward the resistance of top dead centre movement and the system of engine
Dynamic power.Finally, passing through 100 row of being again turned on, engine braking mechanism before the top dead centre that piston 33 arrives at compression stroke
Valve 300 discharges gas compressed in cylinder.
Above description contains many specific embodiments, this should not be construed so as to limit the scope of the present, and
It is as representing some specific illustrations of the invention, many other differentiation are likely to therefrom generate.For example, hair here
Motivation braking method can be used for different engines, including overhead cam engine and pushrod engine；It can be used for single gas
Valve engine can also be used for the multivalve engine of more than two valves；The engine braking that can be used for two strokes, can also
To be used for four-stroke engine braking.
In addition, engine braking can be different substance to the medium of vapour cylinder injection, the time of injection is adjustable,
Its purpose is provided to increase the pressure in cylinder, so that the resistance of motion of the piston in cylinder increases, to increase the system of engine
Dynamic power.
In addition, the mechanism of jet, mode and time etc. can be different in the exhaust pipe of engine here.
Therefore, the scope of the present invention should not be determined by above-mentioned specific illustration, but be determined by claim.
Claims (12)
1. a kind of engine braking methods slow for vehicle, it is characterised in that: the method the following steps are included:
A) engine is run under scheduled revolving speed,
B) pressure at expulsion of engine is adjusted,
C) temperature of engine is controlled,
D) make a reservation for high temperature when the piston in engine cylinder reaches toward the top dead centre movement of compression stroke, compression gas in the jar
When, to the fuel oil of vapour cylinder injection predetermined amount,
E) it allows the fuel oil to burn during compression stroke, increases the pressure and temperature in cylinder,
F) before the top dead centre that piston arrives at compression stroke, exhaust valve is opened, discharges the gas for being compressed and being burnt in cylinder.
2. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the adjusting is started
The step of pressure at expulsion of machine includes one of following processes or their combination:
A) pressure at expulsion of engine is adjusted using turbocharger, the turbocharger includes variable turbo supercharger,
B) pressure at expulsion of exhaust throttle valve regulation engine is used, the exhaust shutter includes exhaust butterfly valve,
C) pressure at expulsion of engine is adjusted using exhaust gas recycling system, the exhaust gas recycling system includes interior is vented again
The circulatory system and outer exhaust gas recycling system.
3. the engine braking methods slow for vehicle as claimed in claim 2, it is characterised in that: the interior exhaust is again
The circulatory system adopts one of following processes or their combination:
A) during the induction stroke of engine other than conventional IO Intake Valve Opens, the exhaust valve of engine is also opened,
B) during the exhaust stroke of engine other than conventional exhauxt valve opens, the inlet valve of engine is also opened.
4. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the control is started
The step of temperature of machine includes controlling one of following temperature or their combination:
A) cylinder temperature of engine,
B) delivery temperature of engine,
C) oil temperature of engine,
D) cooling water temperature of engine.
5. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: to vapour cylinder injection
The predetermined amount of fuel oil is determined by one of following parameters or their combination:
A) temperature of engine,
B) revolving speed of engine,
C) load limitation of engine braking.
6. engine braking methods as described in claim 1, it is characterised in that: the fuel oil of the predetermined amount is opening exhaust
The cylinder of engine is sprayed into before door.
7. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: described making a reservation for is high
Temperature is determined by the burning point of fuel oil.
8. as described in claim 1 for the slow engine braking methods of vehicle, it is characterised in that: the fuel oil includes
Diesel oil.
9. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the engine is pre-
Revolving speed is determined between 1000 revs/min to 2000 revs/min.
10. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the engine
Desired speed is between 1200 revs/min to 1500 revs/min.
11. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the engine
Braking includes that four-stroke engine is braked.
12. the engine braking methods slow for vehicle as described in claim 1, it is characterised in that: the engine
Braking includes that two-cycle engine is braked.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051902.0A CN109854391B (en) | 2015-05-12 | 2015-05-12 | Engine braking method for improving vehicle retarding |
| CN201910051807.0A CN109882296A (en) | 2015-05-12 | 2015-05-12 | A kind of engine braking methods slow for vehicle |
| CN201510238880.0A CN106285966B (en) | 2015-05-12 | 2015-05-12 | The engine braking methods slow for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510238880.0A CN106285966B (en) | 2015-05-12 | 2015-05-12 | The engine braking methods slow for vehicle |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910051902.0A Division CN109854391B (en) | 2015-05-12 | 2015-05-12 | Engine braking method for improving vehicle retarding |
| CN201910051807.0A Division CN109882296A (en) | 2015-05-12 | 2015-05-12 | A kind of engine braking methods slow for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106285966A CN106285966A (en) | 2017-01-04 |
| CN106285966B true CN106285966B (en) | 2019-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510238880.0A Expired - Fee Related CN106285966B (en) | 2015-05-12 | 2015-05-12 | The engine braking methods slow for vehicle |
| CN201910051902.0A Expired - Fee Related CN109854391B (en) | 2015-05-12 | 2015-05-12 | Engine braking method for improving vehicle retarding |
| CN201910051807.0A Pending CN109882296A (en) | 2015-05-12 | 2015-05-12 | A kind of engine braking methods slow for vehicle |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910051902.0A Expired - Fee Related CN109854391B (en) | 2015-05-12 | 2015-05-12 | Engine braking method for improving vehicle retarding |
| CN201910051807.0A Pending CN109882296A (en) | 2015-05-12 | 2015-05-12 | A kind of engine braking methods slow for vehicle |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6809253B2 (en) * | 2017-01-25 | 2021-01-06 | いすゞ自動車株式会社 | engine |
| WO2019028424A1 (en) | 2017-08-03 | 2019-02-07 | Jacobs Vehicle Systems, Inc. | Systems and methods for counter flow management and valve motion sequencing in enhanced engine braking |
| CN108730023B (en) * | 2018-04-19 | 2023-02-21 | 上海尤顺汽车技术有限公司 | Method and device for controlling exhaust gas flow of engine |
| EP3783207A4 (en) * | 2018-04-19 | 2022-01-05 | Shanghai Ennova Valvetrain Corp. | Compound engine braking method and turbocharging control apparatus |
| CN110735724B (en) * | 2018-07-18 | 2021-04-20 | 上海尤顺汽车部件有限公司 | Method and system for braking compound engine |
| CN110836141B (en) * | 2018-08-16 | 2020-12-08 | 上海尤顺汽车部件有限公司 | Method and system for increasing exhaust pressure of engine |
| CN109736958A (en) * | 2019-03-21 | 2019-05-10 | 潍柴动力股份有限公司 | A method of improving engine brake power |
| EP3913205A1 (en) * | 2020-05-18 | 2021-11-24 | Ningbo Geely Automobile Research & Development Co. Ltd. | Method for engine braking and a powertrain |
| CN111828169A (en) * | 2020-08-10 | 2020-10-27 | 田国庆 | Hybrid power engine |
| CN112051065B (en) * | 2020-08-19 | 2022-11-11 | 中国第一汽车股份有限公司 | Engine brake system testing method |
| CN112065600A (en) * | 2020-09-09 | 2020-12-11 | 潍柴动力股份有限公司 | Method for raising temperature of after-treatment system of compression release engine and engine |
| CN113984405B (en) * | 2021-10-18 | 2024-05-07 | 中国第一汽车股份有限公司 | Retarder braking performance test method |
| CN114876658B (en) * | 2022-04-26 | 2023-05-23 | 潍柴动力股份有限公司 | Protection method and system for clamping stagnation of air release valve of supercharger under braking working condition |
| CN115329507B (en) * | 2022-10-14 | 2023-01-24 | 潍柴动力股份有限公司 | Intake valve profile design method and intake valve |
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- 2015-05-12 CN CN201910051807.0A patent/CN109882296A/en active Pending
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| CN109882296A (en) | 2019-06-14 |
| CN106285966A (en) | 2017-01-04 |
| CN109854391B (en) | 2021-05-25 |
| CN109854391A (en) | 2019-06-07 |
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Address after: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Patentee after: Shanghai Youshun Automobile Technology Co.,Ltd. Address before: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Patentee before: Shanghai Universoon Autoparts Co.,Ltd. |
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