CN104948325A - Gasoline engine and method for testing gasoline octane value thereof - Google Patents
Gasoline engine and method for testing gasoline octane value thereof Download PDFInfo
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Abstract
Provided is a gasoline engine and a method for testing a gasoline octane value thereof. The gasoline engine uses any gasoline with an unknown octane value, the octane value of the gasoline fuel can be detected automatically, and a corresponding combustion control method can be selected automatically according to the octane value of the gasoline. One combustion control method is homogeneous thin fuel lighting combustion method, the air-fuel ratio can reach over 40, and the specific fuel consumption is lower than 200 kW.h/g. The gasoline engine can use any kind of gasoline with the octane value ranging from -30 to 120 as fuel, the octane value of the fuel does not need to be known in advance, and the gasoline engine is an intelligent internal combustion engine.
Description
Technical field
The internal-combustion engine of mechanical industry and automotive field.
Background technique
Internal-combustion engine is a ripe technology, the basic structure of internal-combustion engine and principle be Professional visitors be familiar with.
The gasoline that petrol engine generally adopts label fixing, namely petrol engine generally can only use a kind of gasoline of octane value label, otherwise just can not obtain stable power stage, even can not normally run.
The method of test octane number is generally divided into organon and motor method.Organon adopts a single cylinder piston connecting bar and crankshaft system, and under normal environment conditions, adjusting cylinders compression ratio take different compression ratios compression equivalent proportion as gasoline and the air mixed oil and gas of 1.When fuel-air mixture is by compression ignite, the isooctane proportion of the normal benzine that inquiry and contrast can be configured by the use normal heptane of compression ignite and isooctane under the same conditions, this isooctane proportion numerical value is exactly the octane value index of tested gasoline.
The combustion mode (combustion control method) of internal-combustion engine, is generally divided into Spark ignition type and compression-ignited two kinds.The advantage of Spark ignition type combustion mode is that work is soft, and HP, hp/litre is large, and shortcoming is that heat to power output efficiency is low.The advantage of compression-ignited combustion mode to realize lean combustion, and motor hot merit conversion efficiency is high, and shortcoming is rough running, and power per liter is low.
Homogeneous oil gas lean combustion, having the advantage that work is soft and heat to power output efficiency is high, is the dream of internal-combustion engine industry research personnel.But because homogeneous lean fuel (gasoline) is difficult to use plug ignition, therefore this dream fails to realize always.
Summary of the invention
1, the main composition of petrol engine of the present invention and parts comprise cylinder, piston, connecting rod-crankshaft mechanism, spark plug, the gentle fitting of door of valve, oil pump, oil nozzle, controller, etc.Controller is usually also referred to as computer or car running computer (ECU).This petrol engine can use the fuel of the gasoline of octane value the unknown or similar gasoline, automatically the octane value of gasoline can be detected, and according to any one octane value of the octane value detected in-30 ~ 120 scopes, selected corresponding best combustion control method is a kind of intelligentized internal-combustion engine.This petrol engine can also realize the homogeneous lean ignited fuel combustion mode (controlling method) of gasoline.
2, the method of a kind of petrol engine test of the present invention octane number, adopt a petrol engine, the method of simulation-search technique test octane number, detect the output torque of motor, rotating speed, fuel injection quantity, oil spout number of times, oil spout phase place, air fuel ratio, plug ignition phase place, water tank temperature, oil temperature, ambient temperature, exhaust temperature (above-mentioned parameters, hereinafter referred to as " cylinder combustion key element "), slow adjustment plug ignition phase place (or main injection oil spout phase place of compression-ignited petrol engine), general in compression stroke, ignition phase is moved towards the position away from top dead center, until there is pinking, detect plug ignition phase place when pinking occurs, and the value of every cylinder combustion key element, search database data, find that octane value numerical value is that how many gasoline and pinking can should occur under the same conditions, then tentatively judge motor use the octane value of fuel (gasoline).When knock is detected, plug ignition phase place is postponed rapidly, to avoid pinking.Automobile industry to the detection of engine knock, and in order to avoid pinking is to the postponement of ignition phase, is prior art.Generally, there is 6 pinkings continuously, can determine that pinking produces.For the detection situation of data between two groups of data (such as, octane value is between 55 and 56), the octane value index of detection proportionally calculates, and data are accurate to one decimal place (such as, octane value is 55.3).
After engine operating load or other change of state, when running relatively steadily, repeat aforesaid operations, confirm the octane value of gasoline further.This detects and confirmation process is dynamic, even use the fuel that a certain octane value is fixing, this detects and confirmation process is also useful, can based on fuel with the change of environmental change after-combustion performance, Optimizing Combustion controlling method, increase the Power output of motor, reduce fuel consumption, optimize exhaust index.Therefore, the internal-combustion engine adopting controlling method of the present invention is intelligentized internal-combustion engine.This internal-combustion engine (or petrol engine) can the octane value of based on fuel (gasoline), determine that (rotating speed and moment of torsion export at different loads, and other cylinder combustion key element) state, adopt ignition combustion pattern or compression ignition combustion pattern, and adopt the homogeneous lean combustion pattern of ignition combustion pattern.
Database data is originated, produced the condition data of pinking at different conditions from the various gasoline that-30 ~ 120 octane values are spaced apart 1 by stand test test octane value scope, then this mass data is combined into database, and be stored in engine controller inside, inquire about contrast at any time for controller.Stand test and test data are combined into database, and database purchase is to engine controller, and controller to management, the inquiry of database, contrast, compare, be prior art.Database data can also be made into MAP spectrum, 151 kinds of gasoline of octane value scope-30 ~ 120, has 151 MAP spectrums.The making of collection of illustrative plates, storing and transfer, is also prior art.General follow-on test 6 times, and when octane value detection data restrain relatively, get the testing result of mean value as octane value of 4 mediants.Disperse if detect data, or occur the phenomenon that overlaps at collection of illustrative plates, then supplement and increase the number of times of test data, and take into account historical data, the unlatching taking into account fuel tank cap whether, is then judged.
This Fuel Petroleum can be the product of petroleum refining, can be also biomass fuel, or derive from the synthetic fuel of other raw materials such as coal.According to this method, detectable octane number scope can also lower than-30, or higher than 120.
3, the lean combustion controlling method of a kind of internal-combustion engine of the present invention, its technical characteristics is: the fuel adopting gasoline or similar gasoline, gasoline and air pre-mixing are closed, adopt plug ignition, air fuel ratio is more than or equal to 45 sustainedly and stably, or air fuel ratio is more than or equal to 40 sustainedly and stably and is less than 45, or air fuel ratio is more than or equal to 35 sustainedly and stably and is less than 40, or air fuel ratio is more than or equal to 30 sustainedly and stably and is less than 35, or air fuel ratio is greater than 25.5 sustainedly and stably and is less than 30, or air fuel ratio is more than or equal to 20 sustainedly and stably and is less than or equal to 25.5, or air fuel ratio is more than or equal to 18 sustainedly and stably and is less than 20, or air fuel ratio is more than or equal to 16 sustainedly and stably and is less than 18, or air fuel ratio is more than or equal to 15 sustainedly and stably and is less than 16.This air fuel ratio " sustainedly and stably " remains on a scope, is not to reach the short time, but motor stably can run even several hours a few minutes with such air fuel ratio.
Air fuel ratio is limited within 25.5 by present automotive engine control, but motor can not be kept sustainedly and stably to run near 25 with air fuel ratio.Because at low-load, when suction pressure is lower, improves air fuel ratio and engine ignition reliability can be made to reduce, even cannot light a fire.Motor cannot enter the homogeneous lean ignited fuel combustion regime of high air-fuel ratio.This is a technology barrier of puzzlement internal-combustion engine researcher decades.Such as, the petrol engine of compression ratio 10.5, uses 93# gasoline, when suction pressure is 40kpa, adopts air and fuel ratio 18, just can not use spark plug normal ignition.But under similarity condition, use octane value be 40 gasoline replace 93# gasoline as fuel, just can use spark plug normal ignition.Or under similarity condition, the compression ratio of cylinder is brought up to 17, just can use spark plug normal ignition.
The key technical feature that the present invention realizes above-mentioned technical characteristics is: the controlling method entering the ignition combustion state of high air-fuel ratio mixed oil and gas, and concrete grammar has four, and they are:
(1), adopt the method increasing cylinder compression ratio, improve the temperature of compression stroke end fuel-air mixture, increase the igniting reliability that thin fuel-air mixture adopts plug ignition.Compression ratio can be brought up to 12-15 by petrol engine, or 15-17, or 17-19, uses No. 93 gasoline, or No. 97 gasoline.
(2), equivalent proportion is adopted to be that the fuel-air mixture of 1 is as fuel concentration during underrun, along with the lifting of load, namely along with the increase of air inlet pressure, fuel-air mixture increases in the temperature of compression stroke end, under raising air fuel ratio can ensure the prerequisite of igniting reliability, progressively increase air fuel ratio.Stand test can determine the air fuel ratio that can ensure igniting reliability.
(3) upper limit amount of suction pressure, is increased.For the ease of improving air fuel ratio, and under the constant prerequisite of maximum output, fuel saving.
(4), suction pressure is when being in a high position, especially during WOT, is the opportune time improving or increase air fuel ratio;
These four kinds of concrete grammars are used alone, or combinationally use.
When equivalent proportion is 1, standard air fuel ratio is generally 14.7 or 14.6.
After suction pressure reaches maximum value, maintain suction pressure as far as possible and be in a high position, when needing to reduce load, just control to increase air fuel ratio, reduce fuel injection amount.Control air fuel ratio as far as possible and be in a high position.Under various condition, the reliability of plug ignition, or the upper data allowing air fuel ratio to reach, can be obtained by stand test.In other words, concrete corresponding with octane number, with various cylinder combustion key element can the air fuel ratio of reliable ignition and suction pressure, need to be determined by stand test.This Bench test methods is prior art.
Homogeneous lean ignited fuel combustion mode, also can adopt the method for repeatedly oil spout, increases the relative nonuniformity of homogeneous fuel-air mixture, improves velocity of combustion.
Under the prerequisite meeting power and moment of torsion output requirement, under the prerequisite ensureing igniting reliability, the mixed proportion of raising air and fuel as far as possible, to improve motor hot merit conversion efficiency, the discharge amount of oxynitrides in reduction tail gas.Same power stage, fuel consumption reduces.Once because raising air fuel ratio makes plug ignition reliability reduce, (existing motor car engine has the technical measures detecting plug ignition reliability, usual title fails normal ignition for " catching fire "), or can not normal ignition, then reduce air fuel ratio (increase fuel injection quantity) immediately, until recover normal ignition.
Adopt the method for partial tail gas reuse, reduce oxygen content in fuel-air mixture, to reduce the oxynitrides content of emission.A closure can be set, for regulating the ratio of recycling tail gas.Along with the increase of air fuel ratio, increase the aperture of tail gas closure, increase the ratio of recycling tail gas.
Equivalent proportion is greater than after 1, improve air fuel ratio, in the fuel-air mixture of equal in quality, the ratio of air increases, fuel-air mixture is increased by the difficulty of lighting a fire, in flame combustion and diffusion process, unit of fuel needs the mass of medium of heating to increase, and therefore flame temperature is lower, flame spread speed is slower, namely velocity of combustion is comparatively slow, is equivalent to the octane value (relative octane value) that improve gasoline, is equivalent to the burning-point that improve gasoline.Therefore, adopt homogeneous lean fuel (gasoline) ignition combustion control technique, higher compression ratio can be adopted, but do not have pinking.
Use regular price gasoline cannot promote air fuel ratio (such as: suction pressure 40kpa at low-load, compression ratio 10, air fuel ratio can not reach 18, or 17, because under such air fuel ratio condition, spark plug reliable ignition cannot be used), this is Development of I. C. Engine Industry over 100 years, fails to realize the key obstacle of homogeneous lean ignited fuel combustion control technology and application.
The component of combustion of cylinder includes but not limited to: suction pressure (air inflow), intake temperature, ambient temperature, water tank temperature, oil temperature, rotating speed, plug ignition phase angle (firing time), fuel injection quantity (each time), injection pressure, oil spout number of times, oil spout phase angle, compression ratio, moment of torsion export, the octane value of gasoline, whether occur pinking, etc.Some parameter can control, and some is intrinsic uncontrollable of equipment and changes, but has important impact to the selection of controling parameters.
" air feed " described in this specification, represents supply air.Air fuel ratio refers to the ratio of air and fuel.The structure of internal-combustion engine related to the present invention, basic functional principle, etc., be those skilled in the art it is well known that prior art, this specification does not describe in detail.
Specific implementation method
Embodiment 1, the internal-combustion engine of 4 cylinder 4 strokes, and cylinder bore is 76 millimeters, and compression ratio is 10, and use octane value is the gasoline (organon RON) of 93.At the intake stroke of internal-combustion engine, to in-cylinder injection fuel (or to admission line burner oil), air and fuel mixture ratio are in the basicly stable equivalent proportion 1 of low-load region, or enriching (prior art) a little, higher load region starts slowly to reduce fuel increment, and (increase with load, air fuel ratio increases, fuel delivery also increases), increase air fuel ratio, after entering high load region, air fuel ratio can be increased quickly.Table 1 is the citing of a kind of controlling method that air fuel ratio changes with suction pressure:
One of control program that table 1 air fuel ratio increases with suction pressure and increases
| Suction pressure (kpa) | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Air fuel ratio | 14.6 | 14.6 | 14.6 | 14.7 | 14.8 | 15 | 15.3 | 15.6 |
| Suction pressure (kpa) | 110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 |
| Air fuel ratio | 16 | 16.4 | 16.8 | 17.2 | 17.6 | 18 | 18.4 | 18.8 |
| Suction pressure (kpa) | 190 | 200 | 210 | 220 | 230 | 240 | ||
| Air fuel ratio | 19.2 | 19.7 | 20.2 | 20.7 | 21.2 | 21.7 |
Engine startup air fuel ratio is not with suction pressure change, and perform according to equivalent proportion 1, or fuel concentration has increased slightly, this is prior art.
When equivalent proportion is 1, air fuel ratio is 14.6 or 14.7.There is different selections in different motor corporations to the air fuel ratio corresponding to equivalent proportion 1.
Contrasting data listed by table 1 be motor from low load condition increasing productivity time, guarantee the controling parameters of reliability of lighting a fire.During from high load to low-load transition, can perform according to higher air fuel ratio.Such as: the air fuel ratio that suction pressure 180kpa is corresponding is 18.8, when reducing load, suction pressure can be maintained and do not reduce or few reduction, and air fuel ratio is risen to 19, or 20, or higher.During this reduction load, the maximum air fuel ratio data for various different octane gasoline corresponding to various suction pressure, can be obtained by stand test.
Equally, table 1 and table 2 column data, can obtain according to stand test and optimize, and different according to each motor or the automaker standard to igniting reliability, makes compensating or correcting accordingly.
The selection of the optimal air-fuel ratio under various working condition, also should consider the factors such as ambient temperature, water tank temperature, oil temperature, and makes corresponding compensation or correction.
Obtaining above by stand test, and compensate or correct the method for the air fuel ratio corresponding to suction pressure, is prior art.
The internal-combustion engine of embodiment's 2: one 4 cylinder 4 strokes, cylinder bore is 76 millimeters, and compression ratio is 17, and use octane value is the gasoline (organon RON) of 93.The hardware components that embodiment 2 is different from embodiment 1 is only that the compression ratio of cylinder is brought up to 17 from 10, then, when normally running (start up period except), the speed that air fuel ratio increases with suction pressure and increases can be higher, as shown in table 2.
The control program two that table 2 air fuel ratio increases with suction pressure and increases
| Suction pressure (kpa) | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Air fuel ratio | 14.6 | 14.7 | 14.9 | 15.2 | 15.6 | 16.1 | 16.6 | 17.1 |
| Suction pressure (kpa) | 110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 |
| Air fuel ratio | 17.7 | 18.3 | 18.9 | 19.5 | 20.2 | 20.9 | 21.6 | 22.3 |
| Suction pressure (kpa) | 190 | 200 | 210 | 220 | 230 | 240 | 250 | 260 |
| Air fuel ratio | 23.1 | 23.9 | 24.7 | 25.5 | 26.3 | 27.2 | 28.1 | 29 |
Embodiment 3, after motor enters high load running, need to reduce load operation, or when entering cruising speed operation, maintenance suction pressure can be adopted constant, is only the method reducing fuel injection amount, improve air fuel ratio, thus realize the object of fuel saving.
When motor is in comparatively low-load, and during the higher running state of air fuel ratio, if need increasing productivity, only by the method increasing throttle opening, or increase fuel duty by the method (maintaining air fuel ratio constant) increasing air inflow, engine response speed can be very slow.The present invention adopts that to maintain air inflow constant or increase while air inflow, reduce air fuel ratio, can increase fuel duty fast by the method reducing air fuel ratio, the power performance of motor can show outstanding especially, and namely the acceleration performance of automobile can be very outstanding.Even if by reducing the method for air fuel ratio, the short time promotes engine load, and air fuel ratio now still can higher than equivalent proportion 1, with fuel saving.
Embodiment 4, the internal-combustion engine of 4 cylinder 4 strokes, and cylinder bore is 76 millimeters, and compression ratio is 17.0, and use octane value is the low octane value gasoline (organon RON) of 55.First internal-combustion engine runs in compression ignite state, and rotating speed is at 2000 revs/min, and oil spout phase place arrives budc 26 degree at compression piston, suction pressure 106kpa, air fuel ratio 40.6, water tank temperature 88 DEG C, oil temperature 90 DEG C, and moment of torsion exports as 18NM.On the basis of this steady operational status, conversion combustion control method enters homogeneous lean ignited fuel combustion regime of the present invention, concrete controling parameters is: fuel injection phase at intake stroke piston through atdc 60 degree, suction pressure 106kpa, air fuel ratio 40.6, plug ignition phase place is that compression piston arrives budc 10 degree, when rotating speed is similarly 2000 revs/min, water tank temperature 80 DEG C, oil temperature 90 DEG C, moment of torsion exports as 25NM, and specific fuel consumption is 205kWh/g.In running, there is no pinking.As can be seen here, when air fuel ratio is identical, homogeneous ignition combustion controlling method is compared with diffusion compression ignition combustion controlling method, and motor hot merit conversion efficiency is higher, and Power output is larger.Because the flame temperature of homogeneous lean ignited fuel combustion manner is lower, in expection motor exhaust, oxynitrides content is lower.
Embodiment 5, the internal-combustion engine of 4 cylinder 4 strokes, and cylinder bore is 76 millimeters, and compression ratio is 10, turbosupercharging, and use octane value is the low octane value gasoline (organon RON) of 40.The factory-designed suction pressure upper limit of this internal-combustion engine genuine is 180kpa, and Maximum Torque exports as 240NM.Demonstration test of the present invention, is adjusted to 240kpa by the suction pressure upper limit, and the air fuel ratio of corresponding 240kpa suction pressure is 25, and test result shows, under rotating speed is 2000 revs/min of prerequisites identical with maximum output torque, and fuel saving 18.1%.
When embodiment 6, petrol engine detect octane number, one of method of slow premature ignition phase place: current operating condition, especially under the condition that suction pressure and fuel injection quantity are determined, motor generally can a corresponding narrower torque range (database data), from the lower edge near this torque range,, until there is pinking in progressively early spark plug ignition phase.During rotating speed 2000 revs/min, with 60 milliseconds for unit of time, every 0.1 degree, 60 milliseconds of premature ignition phase places (engine rotation one week is 360 degree), generally, the pinking of motor acting one-time detection.
Claims (5)
1. the method for a petrol engine test octane number, its technical characteristics is: adopt a petrol engine, detects output torque, fuel injection quantity, oil spout number of times, oil spout phase place, injection pressure, air fuel ratio, plug ignition phase place, suction pressure, intake temperature, water tank temperature, oil temperature, ambient temperature, the rotating speed of motor; Slow adjustment plug ignition phase place, until there is pinking, detect the phase place of plug ignition when pinking occurs, and the value of above-mentioned parameters, search database data, find that octane value numerical value is that how many gasoline and pinking can should occur under pinking the same terms, then tentatively judge motor use the octane value of fuel;
When knock is detected, plug ignition phase place is postponed rapidly, to avoid pinking;
After engine operating load, change of state, when running relatively steadily, repeat aforesaid operations, confirm the octane value of gasoline further;
At petrolic controller installation database, store the condition data that 151 kinds of gasoline that the octane value of octane value from-30 ~ 120 be spaced apart 1 produce pinking under different working condition, inquire about contrast at any time for controller; Database data or with MAP spectrum form store.
This Fuel Petroleum is the product of petroleum refining, or biomass fuel, or synthetic fuel.
2. the method for a kind of petrol engine test octane number according to claim 1, a kind of petrol engine, its technical characteristics is: the database of pinking appears in the 151 kinds of octane rating gasoline storing octane value scope-30 ~ 120 in controller under various operating mode and cylinder component of combustion condition; Store the database for the best combustion control method of these 151 kinds of octane rating gasoline under various working condition; Various cylinder combustion key elements corresponding when there is pinking by detecting continuously in petrol engine running, judge the octane value of gasoline in fuel tank; According to the judgement of Fuel Petroleum octane value and the current data of various cylinder combustion key element, determine to adopt any or which plant combustion control method and control strategy.
3. a lean combustion controlling method for internal-combustion engine, its technical characteristics is: the fuel adopting gasoline or similar gasoline, and gasoline and air pre-mixing are closed, and adopt plug ignition, air fuel ratio is more than or equal to 45 sustainedly and stably; Or air fuel ratio is more than or equal to 40 sustainedly and stably and is less than 45; Or air fuel ratio is more than or equal to 35 sustainedly and stably and is less than 40; Or air fuel ratio is more than or equal to 30 sustainedly and stably and is less than 35; Or air fuel ratio is greater than 25.5 sustainedly and stably and is less than 30; Or air fuel ratio is more than or equal to 20 sustainedly and stably and is less than or equal to 25.5; Or air fuel ratio is more than or equal to 18 sustainedly and stably and is less than 20; Or air fuel ratio is more than or equal to 16 sustainedly and stably and is less than 18; Or air fuel ratio is more than or equal to 15 sustainedly and stably and is less than 16;
The key technology realizing above-mentioned technical characteristics is the method controlling to enter high air-fuel ratio mixed oil and gas ignition combustion state:
(1), adopt the method increasing cylinder compression ratio, improve the temperature of compression stroke end fuel-air mixture, increase the igniting reliability that thin fuel-air mixture adopts plug ignition;
(2), equivalent proportion is adopted to be that the fuel-air mixture of 1 is as fuel concentration during underrun, along with the lifting of load, namely along with the increase of air inlet pressure, fuel-air mixture increases in the temperature of compression stroke end, under raising air fuel ratio can ensure the prerequisite of igniting reliability, progressively increase air fuel ratio;
(3) upper limit amount of suction pressure, is increased;
(4), when suction pressure is in a high position, especially when WOT, maintain suction pressure constant, improve or increase air-fuel ration control coefficient, synchronously reducing fuel injection amount;
Above-mentioned four kinds of concrete grammars are used alone, or combinationally use;
Under the prerequisite meeting power and moment of torsion output requirement, under the prerequisite ensureing igniting reliability, the mixed proportion of raising air and fuel as far as possible, to improve motor hot merit conversion efficiency, reduce the discharge amount of oxynitrides in tail gas, same power stage, fuel consumption reduces;
Adopt the method for partial tail gas reuse, reduce the oxynitrides content of emission; Or a closure is set, for regulating the ratio of recycling tail gas; Along with the increase of air fuel ratio, increase the ratio of recycling tail gas.
4. the lean combustion controlling method of a kind of internal-combustion engine according to claim 3, a kind of internal-combustion engine, its technical characteristics is: adopt homogeneous lean ignited fuel combustion control method, the air fuel ratio that engine combustion controls is high, and igniting reliability is high; Use octane value to be less than or equal to the low octane value gasoline of 69, or use the gasoline of other octane value; Adopt tail gas closure, control the ratio of recycling tail gas.
5. a petrol engine, its technical characteristics is: can adopt homogeneous lean ignited fuel combustion control method; Automatically the octane value of fuel in fuel tank can be detected; The fuel of the gasoline of octane value-30 ~ 120 or similar gasoline can be used; Use octane value lower than 69 gasoline or similar Fuel Petroleum time, compression ignition combustion controlling method can be realized;
The database of pinking is there is in the 151 kinds of octane rating gasoline storing octane value scope-30 ~ 120 in controller under various operating mode and cylinder component of combustion condition; Store the database for the best combustion control method of these 151 kinds of octane rating gasoline under various working condition; Various cylinder combustion key elements corresponding when there is pinking by detecting continuously in petrol engine running, judge the octane value of gasoline in fuel tank; According to the judgement of Fuel Petroleum octane value and the current data of various cylinder combustion key element, determine to adopt any or which plant combustion control method and control strategy;
Adopt homogeneous lean ignited fuel combustion control method, the air fuel ratio that engine combustion controls is high, and igniting reliability is high; Use octane value to be less than or equal to the low octane value gasoline of 69, or use the gasoline of other octane value; Adopt tail gas closure, control the ratio of recycling tail gas.
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