CN106285966A - For the engine braking methods that vehicle is slow - Google Patents
For the engine braking methods that vehicle is slow Download PDFInfo
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- CN106285966A CN106285966A CN201510238880.0A CN201510238880A CN106285966A CN 106285966 A CN106285966 A CN 106285966A CN 201510238880 A CN201510238880 A CN 201510238880A CN 106285966 A CN106285966 A CN 106285966A
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Abstract
For the engine braking methods that vehicle is slow, electromotor is run under desired speed (in particularly, the slow-speed of revolution), pressure at expulsion by aerofluxus current-limiting apparatus (such as turbocharger and aerofluxus butterfly valve) regulation electromotor, control the temperature of electromotor, and in the cylinder of electromotor or in exhaustor, spray into the medium of scheduled volume, increase in-cylinder pressure and the resistance of motion of engine piston, thus improve the formulation power of electromotor.When the medium sprayed into is fuel oil, control fuel oil burning during the compression stroke of electromotor, improve in-cylinder pressure and the formulation power of electromotor further.The present invention solves in prior art in electromotor, the slow-speed of revolution time the lowest problem of braking power, reduce and even avoid high-revolving engine braking, eliminate high rotating speed and brake the failure mode such as the top load brought and high row's temperature, improve reliability and durability that engine braking operates.
Description
Technical field:
The present invention relates to mechanical field, particularly relate to engine art, especially for the engine braking methods that vehicle is slow.
Background technology:
In prior art, the existing long history of application of vehicle motor, the conventional ignition running of electromotor is known.For example, four-stroke Diesel engine operated repeatedly according to the cycle, had induction stroke, compression stroke, expansion (or workmanship) stroke and exhaust stroke in each cycle.In the intake stroke, the piston of electromotor moves toward lower dead center from top dead centre in cylinder, and the inlet valve of electromotor is opened, and introduces air into the cylinder of electromotor.Followed by compression stroke, piston moves toward top dead centre from lower dead center, the inlet valve of electromotor and exhaust valve are all in closed mode, air in cylinder is compressed, near top dead center is arrived at piston, mix is incorporated in spontaneous combustion in ensuing expansion (or workmanship) stroke with compressed air in diesel oil sprays into cylinder, produce gas expansion, piston is driven workmanship from top dead centre toward lower dead center.Being finally the exhaust stroke of electromotor, piston moves toward top dead centre from lower dead center again, and the exhaust valve of electromotor is opened, and is discharged in exhaustor by the gas after burning in cylinder, enters offgas duct and be discharged in air after post processing.
Engine braking technology is also widely known by the people, and only need to temporarily be converted to absorb the air compressor machine of energy by the electromotor producing power.Transformation process cuts off fuel oil, in addition to conventional inlet and outlet door is opened during inlet and outlet stroke, at the end of engine piston compresses stroke is close, exhaust valve is again turned on, allow to be released by compressed gas (being air during braking), the energy that electromotor compressed gas in compression stroke is absorbed, the piston of electromotor can not be returned at expansion stroke subsequently, but the aerofluxus and cooling system by electromotor discharges.Final result is effective engine braking, slows down the speed of vehicle.
One precedent of engine braking technology is the U.S. Patent number US provided by comings (Cummins)
3220392 (1965) disclose, the invention of this patent utilizes hydraulic pressure transfer, the motion of injection cam or neighbouring exhaust cam is passed to the valve of electromotor, on the basis of electromotor conventional valve moves, increases the exhaust valve movement of compression release braking near.This invention, during braking running, cuts off fuel oil.
Owing to cutting off fuel oil during engine braking, there is no work by combustion, existing engine brake is not that energy on one's own account produces braking, but a kind of passive, moved the anti-device dragging electromotor to do negative work by vehicle, therefore braking power is directly proportional to engine speed.The electromotor of commercial car in, the braking power of the slow-speed of revolution (1100 arrive 1500rpm) is far below the braking power of high rotating speed (2100 arrive 2500rpm).And these vehicles travel in the most frequently used engine speed exactly in, the slow-speed of revolution.Therefore, it is necessary to improve electromotor in, slow-revving braking power.
Shipping company of Na Weisidawan state (Navistar International Transportation Corp.) discloses a kind of engine braking methods in United States Patent (USP) 5634447 (1997), a small amount of fuel oil sprays into during engine braking electromotor cold in a turbocharging, nothing to increase the braking power of electromotor.In the cylinder of electromotor, a small amount of fuel oil is sprayed into during the compression stroke away from (in advance) top dead-centre.This small amount of fuel oil burning, promotes the cylinder pressure during compression and the energy of turbocharger, thus increases braking power.But, when electromotor is with charge air cooler (air-air), the air themperature sucking electromotor is substantially reduced, the burning of such Cryogenic air fuel oil to spraying into during engine braking brings difficulty, particularly at cold weather, in electromotor is in, the slow-speed of revolution time light the most extremely difficult.8th class heavy truck all with charge air cooler (air-air), and in, the most this truck of the slow-speed of revolution to engine brake power demand maximum when.
Mack Trucks (Mack Trucks, Inc.) disclose a kind of similar engine braking methods in United States Patent (USP) 6337447 (2002), during engine braking, fuel oil (5 milligrams/stroke) in a small amount is sprayed into electromotor cold in a turbocharging, band to increase the braking power of electromotor.During engine braking, in order to avoid the charge air cooler cooling to air, walk around charge air cooler from turbocharger compressed air out, be directly entered the cylinder of electromotor from bypass pipe.So temperature in cylinder is higher, is conducive to the burning of the fuel oil sprayed in advance.But, from the point of view of the test data of this patent disclosure, in, the engine brake power increase of the slow-speed of revolution (below 1500rpm) the least or entirely without change.This indicates that, when the middle and slow speed of revolution of electromotor, fuel oil the most fully burns or the most do not burns.Additionally, a lot of electromotors are in addition to configuration compression-release engine brake, it is also equipped with exhaust brake, such as the aerofluxus current-limiting apparatus such as EPR Exhaust Pressure Regulator (EPR) of the aerofluxus butterfly valve in Chinese market and Europe Volvo.Once exhaust brake starts (limit to exhaustor in air-flow), the effect of turbocharger reduce even wholly without, air inlet is greatly reduced, and charge air cooler works hardly.
In fact, Mack Trucks (Mack Trucks, Inc.) when United States Patent (USP) 6283091 (calendar year 2001) discloses Associated brake (engine compression brake and exhaust brake are used together), the temperature of electromotor can be the highest, particularly when high rotating speed (more than 2000 revs/min), the delivery temperature of electromotor is up to 1200 F(649 C), cylinder temperature is up to 751 F(399 C).This engine overheat produced by Associated brake can cause that fuel nozzle is sharp-tongued to be burnt out, it is therefore proposed that the invention that small bursts fuel oil (1 ~ 30 milligram/stroke) cooling fuel nozzle is sharp-tongued during engine braking.
Summary of the invention:
It is an object of the invention to provide for the slow engine braking methods of vehicle, in described method prior art to be solved engine braking in, the slow-speed of revolution time the lowest technical problem of braking power, in prior art to be solved engine braking in, the slow-speed of revolution time engine temperature is the lowest, fuel oil cannot light or burn insufficient technical problem, also engine braking engine temperature when high rotating speed is the highest, the sharp-tongued technical problem burnt out of fuel nozzle.
A kind of engine braking methods slow for vehicle of the present invention comprises the following steps:
1. electromotor is run under predetermined rotating speed,
2. regulate the pressure at expulsion of electromotor,
3. control the temperature of electromotor,
4. when the piston in engine cylinder move toward the top dead centre of compression stroke, compression gas in the jar reach predetermined high temperature time, to the fuel oil of vapour cylinder injection scheduled volume,
5. allow described fuel oil burn during compression stroke, increase the pressure and temperature in cylinder,
6. arrive at the top dead centre of compression stroke at piston before, open exhaust valve, the gas being compressed and burning in dischargeing cylinder.
Further, the step of the pressure at expulsion of described regulation electromotor includes one of following process or combinations thereof:
1. using the pressure at expulsion of turbocharger regulation electromotor, described turbocharger includes variable turbo supercharger,
2. using the pressure at expulsion of exhaust throttle valve regulation electromotor, described exhaust shutter includes aerofluxus butterfly valve,
3. using the pressure at expulsion of exhaust gas recycling system regulation electromotor, described exhaust gas recycling system includes interior exhaust gas recycling system and outer exhaust gas recycling system.
Further, described interior exhaust gas recycling system adopts one of following process or combinations thereof:
1., during the induction stroke of electromotor in addition to conventional IO Intake Valve Opens, also open the exhaust valve of electromotor,
2., during the exhaust stroke of electromotor in addition to conventional exhauxt valve opens, also open the inlet valve of electromotor.
Further, the step of the described temperature controlling electromotor includes controlling one of following temperature or combinations thereof:
1. the cylinder temperature of electromotor,
2. the delivery temperature of electromotor,
3. the oil temperature of electromotor, and
4. the cooling water temperature of electromotor.
Further, the scheduled volume of the described fuel oil to vapour cylinder injection is determined by one of following parameters or combinations thereof:
1. the temperature of electromotor,
2. the rotating speed of electromotor, and
3. the load limitation of engine braking.
Further, the fuel oil of described scheduled volume described open exhaust valve before spray into the cylinder of electromotor.
Further, in cylinder by compressed gas reach described in predetermined high temperature determined by the burning-point of fuel oil.
Further, described fuel oil includes diesel oil.
The another kind of the present invention is used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
1. electromotor is run under predetermined rotating speed,
2. regulate the pressure at expulsion of electromotor,
3. the conventional admission door at electromotor opens the exhaust valve of electromotor during opening, and allows the cylinder of gas return engine in waste pipe,
4. the gas returned in exhaustor is mixed with the gas in cylinder, improves the combustibility of gas in the jar,
5. when the piston in engine cylinder reaches to make a reservation for high temperature toward the mixed gas in the top dead centre motion, compression cylinder of compression stroke, to the fuel oil of vapour cylinder injection scheduled volume,
6. allow described fuel oil at in-cylinder combustion, increase the pressure and temperature in cylinder,
7. arrive at the top dead centre of compression stroke at piston before, open exhaust valve, the gas being compressed and burning in dischargeing cylinder.
Another of the present invention is used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
1. electromotor is run under predetermined rotating speed,
2. when the piston at electromotor arrives at the lower of induction stroke, in the cylinder of electromotor, spray into the medium of scheduled volume, increase in-cylinder pressure,
3. increase piston resistance toward top dead centre motion in compression stroke,
4. arrive at the top dead centre of compression stroke at piston before, open exhaust valve, discharge gas compressed and medium in cylinder.
Further, the described medium injected in cylinder includes one of following fluid or combinations thereof:
1. gas, described gas includes air,
2. liquid, described liquid includes water and fuel oil.
Another of the present invention is used for the engine braking methods that vehicle is slow, comprises the following steps:
1. electromotor is run under predetermined rotating speed,
2. by the pressure in the aerofluxus current-limiting apparatus regulation exhaust pipe of engine,
3. in exhaustor, spray into the air of scheduled volume,
4. when the piston at electromotor arrives at the lower of induction stroke, open exhaust valve, allow the cylinder of gas return engine in exhaustor, increase in-cylinder pressure,
5. increase piston resistance toward top dead centre motion in compression stroke,
6. arrive at the top dead centre of compression stroke at piston before, open exhaust valve, discharge gas compressed in cylinder.
Further, described aerofluxus current-limiting apparatus includes one of following system or combinations thereof:
1. turbocharger, described turbocharger includes variable turbo supercharger,
2. exhaust shutter, described exhaust shutter includes aerofluxus butterfly valve.
Further, the described air spraying into exhaustor is provided by a jet mechanism, described jet mechanism includes air compressor, jet pipe and snifting valve, the outlet of air compressor is connected by described jet pipe with waste pipe, and described snifting valve is arranged on the outlet of air compressor or on jet pipe.
Further, described electromotor desired speed is between 1000 revs/min to 2000 revs/min.
Further, described electromotor desired speed is between 1200 revs/min to 1500 revs/min.
Further, described engine braking includes that four-stroke engine is braked.
Further, described engine braking includes that two-cycle engine is braked.
The operation principle of the present invention is: when engine braking, time especially in electromotor, slow-speed of revolution braking, certain medium is sprayed in the cylinder of electromotor or in exhaustor, increase pressure in cylinder, the piston of the electromotor resistance of motion in compression stroke is increased, thus increases the formulation power of electromotor.When the medium sprayed into is fuel oil, controlled the temperature of electromotor by the pressure at expulsion of regulation electromotor so that spraying into the fuel oil in cylinder fully can burn during compression stroke, produces bigger piston movement resistance and engine brake power.
The present invention compares with prior art, and its effect is positive and obvious.The present invention substantially increases in electromotor, the braking power of the slow-speed of revolution (vehicle motor actually used in normal revolution), reduce and even avoid high-revolving engine braking, eliminate high rotating speed and brake the failure mode such as the top load brought and high row's temperature, improve reliability and durability that engine braking operates.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of conventional four-stroke engine.
Fig. 2 is the schematic diagram of valve stroke during conventional four-stroke engine igniting running.
Fig. 3 a to Fig. 3 f be the engine braking methods of the present invention embodiment in the piston diverse location in the cylinder of electromotor time the unlatching of engine valve, the flowing of gas and fuel-injected schematic diagram.
Fig. 4 is the schematic diagram of the four-stroke engine valve stroke when compression release braking.
Fig. 5 is the schematic diagram of the valve stroke adopted in the embodiment of the engine braking methods in the present invention.
Fig. 6 be the engine braking methods of the present invention another embodiment in jet mechanism toward the schematic diagram of supply in waste pipe.
Detailed description of the invention:
Embodiment 1:
Fig. 1 and Fig. 2 is used for describing the igniting running of conventional four-stroke engine.The Diesel engine that general electromotor has the electromotor on multiple cylinder, such as commercial car to be six-in-line.But for brevity, Fig. 1 and Fig. 2 illustrate only the cylinder of an electromotor and the motion within a cycle of the valve of this cylinder.The piston 33 of electromotor does periodic movement up and down reciprocatingly in cylinder 35.As it has been 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, engine piston 33 in Fig. 1 moves toward air inlet lower dead center (540 ° in Fig. 2) from exhaust top dead center (360 ° Fig. 2) in cylinder 35, the inlet valve 200 of electromotor is opened, and produces the inlet valve molded line 321 in Fig. 2, introduces air into the cylinder 35 of electromotor.Followed by compression stroke, piston 33 moves toward compression top center (720 ° Fig. 2 or 0 °) from air inlet lower dead center, the inlet valve 200 of electromotor and exhaust valve 300 are all in closed mode, air in cylinder 35 is compressed, when piston 33 arrives near, fuel oil (such as diesel oil) is mixed with compressed air in spraying into cylinder is incorporated in ensuing expansion (or workmanship) stroke explosive burning, produce gas expansion, piston 33 is driven workmanship from compression top center toward expansion bottom dead center (180 ° Fig. 2).Cycle is finally the exhaust stroke of electromotor, and piston 33 moves toward exhaust top dead center from expansion bottom dead center, and the exhaust valve 300 of electromotor is opened, and produces the exhaust valve molded line 220 in Fig. 2, and the gas after burning is discharged in cylinder 35 exhaustor 22.Within noticing that the unlatching of the inlet and outlet door of electromotor is not exclusively limited in inlet and outlet stroke, such as at exhaust top dead center, the unlatching of inlet and outlet door has overlap.Variable valve actuation the most prevailing, in addition to controlling the height of valve opening, the opening time of main regulation exhaust valve and the shut-in time of inlet valve, reaches high efficiency and the low emission of engine operation.
Existing electromotor is equipped with greatly the turbocharger 2 shown in Fig. 1, to improve power and the efficiency of electromotor.From the turbine 6 of the exhaust gas-driven turbine supercharger 2 that the exhaust pipe of engine 22 is discharged, drive coaxial air compressor machine 4, improve the admission pressure in air inlet pipe 8.Owing to the temperature of the air after compression increases, reduce the efficiency of electromotor, so before compressed air enters the cylinder 35 of electromotor, cooling down through charge air cooler 12, then being entered cylinder 35 by air inlet pipe 18 and inlet valve 200.Additionally, the general each cylinder of existing electromotor is equipped with four valves, two inlet valves, two exhaust valves, in Fig. 1, single inlet valve 200 and the single exhaust valve 300 of display are signal effect.
First embodiment of the engine braking methods of the present 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, Fig. 3 a to Fig. 3 f of the present embodiment adds engine brake 100 and exhaust brake 28.Engine brake 100 acts on exhaust valve 300, produces braking exhaust valve lift profile 232 as shown in Figure 4.Notice that exhaust valve lift profile 220 that conventional ignition operates and inlet valve lifting curve 321 retain constant.The exhaust valve lift profile 220 of the height of braking exhaust valve lift profile 232 and cycle much smaller than igniting running.Conventional exhaust brake 28 includes aerofluxus current-limiting apparatus, aerofluxus butterfly valve the most here and other exhaust shutter, is connected to after turbine 6 (can also be placed in before turbine 6) by exhaustor 26.It is true that turbocharger 2, the variable turbo supercharger the most increasingly commonly used, there is the function of aerofluxus current-limiting apparatus, can be used alone, or share with exhaust brake 28, and they can be operated by the control module (ECU) of electromotor, controls the pressure at expulsion of electromotor.
The operation of first embodiment of the engine braking methods of the present invention is as follows.Being run under desired speed by electromotor, the scope of the braked speed of heavy truck electromotor is usually 1000 to 2000 revs/min, and the engine braking rotating speed of most common of which is 1200 to 1500 revs/min.Shown in Fig. 3 a is the induction stroke in engine braking cycles, the piston 33 of electromotor moves toward air inlet lower dead center from exhaust top dead center in cylinder 35, the inlet valve 200 of electromotor is opened, produce conventional inlet valve lift (the conventional admission door lifting curve 321 shown in Fig. 5), introduce air into the cylinder 35 of electromotor.When piston 33 is close to air inlet lower dead center (Fig. 3 b), the exhaust valve 300 of electromotor is opened by engine brake 100, the exhaust valve lift profile 233 of generation exhaust gas recirculatioon (EGR) as shown in Figure 5.By the turbocharger 2 in Fig. 3 b, or exhaust brake 28, or a combination of both, the pressure at expulsion of electromotor is adjusted, make the pressure in exhaustor 22 higher than the pressure in cylinder 35, waste gas in exhaustor 22 returns cylinder 35 by the exhaust valve 200 opened, and controls the temperature (including delivery temperature, cylinder temperature, oil temperature and cooling water temperature) of electromotor, is favorably improved the pressure of gas in the jar, temperature and combustibility.In ensuing compression stroke, piston 33 moves toward compression top center from air inlet lower dead center, and inlet valve 200 and the exhaust valve 300 of electromotor are compressed all in closed mode, the air in cylinder 35.When gas compressed reaches to make a reservation for high temperature (burning-point of such as fuel oil), by fuel injector 500 to the fuel oil (Fig. 3 c) of vapour cylinder injection scheduled volume.Fuel oil spontaneous combustion or pass through spark ignition combustion in high pressure and high-temperature gas.The burning of gas increases the pressure in cylinder and temperature and the piston resistance toward top dead centre motion in compression stroke further, and the braking power of electromotor increases therewith.When piston 33 is close to compression top center as shown in Figure 3 d, engine braking mechanism 100 opens exhaust valve 300 again, produces the exhaust valve lift profile 232 that compression as shown in Figure 5 discharges, the gas being compressed and burning in dischargeing cylinder 35.In ensuing expansion stroke as shown in Figure 3 e, piston 33 moves toward expansion bottom dead center from compression top center, but owing to there is no the pressure of gas above piston 33, it is impossible to do work to the bent axle of electromotor.Engine braking cycles is finally exhaust stroke as illustrated in figure 3f, piston 33 moves toward exhaust top dead center from expansion bottom dead center, the exhaust valve 300 of electromotor opens (the typical wastegate lifting curve 220 shown in Fig. 5) already, piston 33 needs to overcome pressure at expulsion up to move, and increases braking power further.
It is interior exhaust gas recirculatioon (iEGR) that the described above exhaust valve 300 opening electromotor during the exhaust stroke of electromotor produces the exhaust gas recirculatioon of exhaust valve lift profile 233 as shown in Figure 5, interior exhaust gas recirculatioon can also is that the inlet valve 200 opening electromotor during the exhaust stroke of electromotor, and the function of interior exhaust gas recirculatioon is also possible to be realized by outer exhaust gas recirculatioon (eEGR) in addition.
Further, determine by one of following parameters or combinations thereof to the scheduled volume of vapour cylinder injection fuel oil in compression stroke at electromotor: temperature (especially cylinder temperature), the rotating speed of electromotor and the brake load limit of electromotor of electromotor.If cylinder temperature is the lowest, or the burning-point of fuel oil is the highest, and spraying into too many fuel oil can not fully burn；If too many fuel oil produces undue in-cylinder pressure, brake load will overstep the extreme limit；And the temperature of electromotor (including in-cylinder pressure) and brake load are closely related with the rotating speed of electromotor.
Additionally, the fuel oil of scheduled volume described above preferably sprayed into the cylinder of electromotor before opening exhaust valve, in order to avoid unburned fuel oil is retained in cylinder.
Embodiment 2:
Difference between second embodiment and first embodiment of the engine braking methods of the present invention not only has fuel oil spray in engine cylinder with the present embodiment, also includes other gas or liquid medium, such as air and water etc..Although the air sprayed into and water can not burn, but it is likely to increase the pressure in cylinder and resistance that piston moves toward top dead centre, thus increases the braking power of electromotor.If cylinder temperature is sufficiently high, the water sprayed into likely becomes steam and increases pressure in cylinder.
The work process of the present embodiment is similar with first embodiment, no longer repeats at this.
Embodiment 3:
The present embodiment and the difference of above-mentioned first or second embodiments are that the present embodiment is not direct ejection medium in the cylinder of electromotor, but in waste pipe, inject air, then by regulating and controlling the row pressure of electromotor and opening exhaust valve, the air injected in exhaustor is pressed into the cylinder of electromotor.
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, the diesel engine including the general commercial car of air compressor 41(be configured with air compressor), jet pipe 43 and snifting valve 45.Air compressor outlet is connected by jet pipe 43 with waste pipe 22, and snifting valve 45 is arranged on the outlet of air compressor or on jet pipe 43.When running under electromotor is at desired speed, limit extraction flow, the pressure in the regulation exhaust pipe of engine 22 by aerofluxus current-limiting apparatus (turbocharger 2 in Fig. 6, or exhaust brake 28, or a combination of both)；In exhaustor 22, the air of scheduled volume is sprayed into by air jet system；When the piston 33 of electromotor is close to the lower dead center of induction stroke as shown in Figure 6, exhaust valve 300 is opened by engine braking mechanism 100, allow (now pressure at expulsion is more than in-cylinder pressure) in the cylinder 35 of the gas press-in electromotor in exhaustor 22, increase in-cylinder pressure.So, piston 33 resistance and braking power of electromotor toward top dead centre motion in ensuing compression stroke is increased.Finally, before piston 33 arrives at the top dead centre of compression stroke, it is again turned on exhaust valve 300 by engine braking mechanism 100, discharges gas compressed in cylinder.
Described above contains a lot of specific embodiment, and this should not be construed so as to limit the scope of the present, but as representing some concrete illustrations of the present invention, other differentiation many are likely to therefrom produce.For example, engine braking methods here may be used for different electromotors, including overhead cam engine and pushrod engine；May be used for single air valve engine, the multivalve engine of two or more valve can also be used for；May be used for the engine braking of two strokes, it is also possible to for four-stroke engine braking.
Additionally, engine braking can be different materials to the medium of vapour cylinder injection, the time of injection can regulate, and its purpose is provided to increase the pressure in cylinder so that the piston resistance of motion in cylinder increases, thus increases the braking power of electromotor.
Further, here toward the mechanism of jet, mode and time etc. in the exhaust pipe of engine can be different.
Therefore, the scope of the present invention should not determined by above-mentioned concrete illustration, but is determined by claim.
Claims (18)
1. one kind is used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
A) electromotor is run under predetermined rotating speed,
B) pressure at expulsion of electromotor is regulated,
C) temperature of electromotor is controlled,
D) when the piston in engine cylinder move toward the top dead centre of compression stroke, compression gas in the jar reach predetermined high temperature time, to the fuel oil of vapour cylinder injection scheduled volume,
E) allow described fuel oil burn during compression stroke, increase the pressure and temperature in cylinder,
F) arrive at the top dead centre of compression stroke at piston before, exhaust valve is opened, the gas being compressed and burning in dischargeing cylinder.
2. engine braking methods as claimed in claim 1, it is characterised in that: the step of the pressure at expulsion of described regulation electromotor includes one of following process or combinations thereof:
A) using the pressure at expulsion of turbocharger regulation electromotor, described turbocharger includes variable turbo supercharger,
B) using the pressure at expulsion of exhaust throttle valve regulation electromotor, described exhaust shutter includes aerofluxus butterfly valve,
C) using the pressure at expulsion of exhaust gas recycling system regulation electromotor, described exhaust gas recycling system includes interior exhaust gas recycling system and outer exhaust gas recycling system.
3. engine braking methods as claimed in claim 2, it is characterised in that: described interior exhaust gas recycling system adopts one of following process or combinations thereof:
A) during the induction stroke of electromotor in addition to conventional IO Intake Valve Opens, the exhaust valve of electromotor is also opened,
B) during the exhaust stroke of electromotor in addition to conventional exhauxt valve opens, the inlet valve of electromotor is also opened.
4. engine braking methods as claimed in claim 1, it is characterised in that: the step of the described temperature controlling electromotor includes controlling one of following temperature or combinations thereof:
A) cylinder temperature of electromotor,
B) delivery temperature of electromotor,
C) oil temperature of electromotor,
D) cooling water temperature of electromotor.
5. engine braking methods as claimed in claim 1, it is characterised in that: determine by one of following parameters or combinations thereof to the scheduled volume of the fuel oil of vapour cylinder injection:
A) temperature of electromotor,
B) rotating speed of electromotor,
C) load limitation of engine braking.
6. engine braking methods as claimed in claim 1, it is characterised in that: the fuel oil of described scheduled volume sprayed into the cylinder of electromotor before opening exhaust valve.
7. engine braking methods as claimed in claim 1, it is characterised in that: described predetermined high temperature is determined by the burning-point of fuel oil.
8. engine braking methods as claimed in claim 1, it is characterised in that: described fuel oil includes diesel oil.
9. one kind is used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
A) electromotor is run under predetermined rotating speed,
B) pressure at expulsion of electromotor is regulated,
C) the conventional admission door at electromotor opens the exhaust valve of electromotor during opening, and allows the cylinder of gas return engine in waste pipe,
D) gas returned in exhaustor is mixed with the gas in cylinder, improves the combustibility of gas in the jar,
E) when the piston in engine cylinder reaches to make a reservation for high temperature toward the mixed gas in the top dead centre motion, compression cylinder of compression stroke, to the fuel oil of vapour cylinder injection scheduled volume,
F) allow described fuel oil at in-cylinder combustion, increase the pressure and temperature in cylinder,
G) arrive at the top dead centre of compression stroke at piston before, exhaust valve is opened, the gas being compressed and burning in dischargeing cylinder.
10. one kind is used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
A) electromotor is run under predetermined rotating speed,
B) when the piston at electromotor arrives at the lower of induction stroke, in the cylinder of electromotor, spray into the medium of scheduled volume, increase in-cylinder pressure,
C) piston resistance toward top dead centre motion in compression stroke is increased,
D) arrive at the top dead centre of compression stroke at piston before, open exhaust valve, discharge gas compressed and medium in cylinder.
11. engine braking methods as claimed in claim 10, it is characterised in that: the described medium injected in cylinder includes one of following fluid or combinations thereof:
A) gas, described gas includes air,
B) liquid, described liquid includes water and fuel oil.
12. 1 kinds are used for the engine braking methods that vehicle is slow, it is characterised in that: described method comprises the following steps:
A) electromotor is run under predetermined rotating speed,
B) by the pressure in the aerofluxus current-limiting apparatus regulation exhaust pipe of engine,
C) in exhaustor, spray into the air of scheduled volume,
D) when the piston at electromotor arrives at the lower of induction stroke, open exhaust valve, allow the cylinder of gas return engine in exhaustor, increase in-cylinder pressure,
E) piston resistance toward top dead centre motion in compression stroke is increased,
F) arrive at the top dead centre of compression stroke at piston before, open exhaust valve, discharge gas compressed in cylinder.
13. engine braking methods as claimed in claim 12, it is characterised in that: described aerofluxus current-limiting apparatus includes one of following system or combinations thereof:
A) turbocharger, described turbocharger includes variable turbo supercharger,
B) exhaust shutter, described exhaust shutter includes aerofluxus butterfly valve.
14. engine braking methods as claimed in claim 12, it is characterized in that: the described air spraying into exhaustor is provided by a jet mechanism, described jet mechanism includes air compressor, jet pipe and snifting valve, the outlet of air compressor is connected by described jet pipe with waste pipe, and described snifting valve is arranged on the outlet of air compressor or on jet pipe.
15. engine braking methods as described in claim 1,9,10 and 12, it is characterised in that: described electromotor desired speed is between 1000 revs/min to 2000 revs/min.
16. engine braking methods as described in claim 1,9,10 and 12, it is characterised in that: described electromotor desired speed is between 1200 revs/min to 1500 revs/min.
17. engine braking methods as described in claim 1,9,10 and 12, it is characterised in that: described engine braking includes that four-stroke engine is braked.
18. engine braking methods as described in claim 1,9,10 and 12, it is characterised in that: described engine braking includes that two-cycle engine is braked.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051807.0A CN109882296A (en) | 2015-05-12 | 2015-05-12 | A kind of engine braking methods slow for vehicle |
| CN201910051902.0A CN109854391B (en) | 2015-05-12 | 2015-05-12 | Engine braking method for improving vehicle retarding |
| CN201510238880.0A CN106285966B (en) | 2015-05-12 | 2015-05-12 | The engine braking methods slow for vehicle |
Applications Claiming Priority (1)
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| JP2018119472A (en) * | 2017-01-25 | 2018-08-02 | いすゞ自動車株式会社 | engine |
| CN108730023A (en) * | 2018-04-19 | 2018-11-02 | 上海尤顺汽车部件有限公司 | A kind of method and apparatus of control engine exhaust air-flow |
| 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 |
| WO2019201162A1 (en) * | 2018-04-19 | 2019-10-24 | 上海尤顺汽车部件有限公司 | Compound engine braking method and turbocharging control apparatus |
| CN110735724A (en) * | 2018-07-18 | 2020-01-31 | 上海尤顺汽车部件有限公司 | Method and system for braking compound engine |
| CN110836141A (en) * | 2018-08-16 | 2020-02-25 | 上海尤顺汽车部件有限公司 | Method and system for increasing exhaust pressure of engine |
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| WO2021233149A1 (en) * | 2020-05-18 | 2021-11-25 | Ningbo Geely Automobile Research & Development Co., Ltd. | Method for engine braking and powertrain |
| CN113984405A (en) * | 2021-10-18 | 2022-01-28 | 中国第一汽车股份有限公司 | Method for testing braking performance of retarder |
| CN114876658A (en) * | 2022-04-26 | 2022-08-09 | 潍柴动力股份有限公司 | Protection method and system for blocking of air release valve of supercharger under braking condition |
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| 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 |
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| WO2019201162A1 (en) * | 2018-04-19 | 2019-10-24 | 上海尤顺汽车部件有限公司 | Compound engine braking method and turbocharging control apparatus |
| 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 |
| CN110735724A (en) * | 2018-07-18 | 2020-01-31 | 上海尤顺汽车部件有限公司 | Method and system for braking compound engine |
| CN110836141A (en) * | 2018-08-16 | 2020-02-25 | 上海尤顺汽车部件有限公司 | Method and system for increasing exhaust pressure of engine |
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| 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 |
| WO2021233149A1 (en) * | 2020-05-18 | 2021-11-25 | Ningbo Geely Automobile Research & Development Co., Ltd. | Method for engine braking and powertrain |
| CN113984405A (en) * | 2021-10-18 | 2022-01-28 | 中国第一汽车股份有限公司 | Method for testing braking performance of retarder |
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| CN114876658A (en) * | 2022-04-26 | 2022-08-09 | 潍柴动力股份有限公司 | Protection method and system for blocking of air release valve of supercharger under braking condition |
| CN115329507A (en) * | 2022-10-14 | 2022-11-11 | 潍柴动力股份有限公司 | Intake valve profile design method and intake valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109882296A (en) | 2019-06-14 |
| CN109854391B (en) | 2021-05-25 |
| CN109854391A (en) | 2019-06-07 |
| CN106285966B (en) | 2019-03-15 |
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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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