CN107795395B - A kind of disconnected cylinder drop torsion method of gasoline engine - Google Patents
A kind of disconnected cylinder drop torsion method of gasoline engine Download PDFInfo
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- CN107795395B CN107795395B CN201710584289.XA CN201710584289A CN107795395B CN 107795395 B CN107795395 B CN 107795395B CN 201710584289 A CN201710584289 A CN 201710584289A CN 107795395 B CN107795395 B CN 107795395B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The present invention relates to a kind of disconnected cylinders of petrol engine to drop torsion method, it is three cylinders and three cylinders or more suitable for cylinder number, it is characterized by: increasing gaseous mixture adaptive control function by the adaptive dedicated control software of gaseous mixture on the basis of usual directly jetting gasoline engine air-fuel ratio closed loop function, fuel injector oil spout instruction is issued as a disconnected cylinder control period using two engine operational cycles, and combine the adjusting of the angle of ignition, it is required to which the drop for reaching more accurate is turned round, specific method includes eight steps.The beneficial effects of the invention are as follows, under the premise of not increasing engine mechanical structure and electronic device hardware cost, by the way that addition drop turns round efficiency calculation, drop turns round coordination in ECU control strategy, disconnected cylinder strategy, disconnected cylinder execute and the functions such as igniting is corrected, it is final to realize that engine drop turns round precision and is enhanced about more than once, engine drop turns round effect when improving efficiently vehicle shift, improves vehicle shift ride comfort.
Description
Technical field
The invention belongs to field of automobile electronic control.It is related to a kind of disconnected cylinder drop torsion method of petrol engine, is suitable for cylinder number
More than three cylinders and three cylinders, electric-controlled fuel injector, spark plug and control unit of engine ECU (Engine Control are installed
Unit petrol engine and vehicle).
Background technique
For with conventional speed change mechanism such as manual transmission, the automobile for thering is grade to determine gearbox automatically, entire
In driving process, system may require that the torque rapid decrease of engine output, such as when vehicle rises to high tap position by low-grade location,
In order to guarantee the ride comfort of shift process, engine is needed to can be realized fast prompt drop torsion and disconnected cylinder problem.
Pervious in the prior art in the present invention, patent document (CN103470324A) discloses a kind of disconnected cylinder machine of engine
Structure, including the rocker arm of the actuated by cams driven by camshaft, and the valve for being connected to one end, being driven by the rocker arm,
Further include be connected to the rocker arm other end opposite with valve, pushing tow or traction are carried out to the rocker arm so that rocker arm and cam connect
Touching or isolated executing agency.Disclosed in patent document (CN103204164A) a kind of hybrid vehicle control system and
Torque, idle stop control method drop in engine, including have anti-blocking brake system ABS (Antilock Brake
System) ABS module, entire car controller and the Engine ECU of function, ABS module pass through entire car controller and Engine ECU
Communication connection.The reduction torque command that ABS is issued is forwarded to Engine ECU by entire car controller, and entire car controller sends idle
Speed shuts down control instruction to Engine ECU.A kind of non pressurized multi-cylinder diesel engine is disclosed in patent document (CN205400912U)
Disconnected cylinder fuel-economizing control device, including ECU, engine and fuel tank, ECU is connected to engine by control bus, in engine
Equipped with injection pump, injection pump is connected to fuel tank by oil pipe, is connected to engine by high-pressure oil pipe, and high-pressure oil pipe pipeline is equipped with
Branch's oil pipe is connected to fuel tank, and electromagnetic valve switch is equipped on branch's oil pipe, and electromagnetic valve switch is connect by control with feedback line
ECU。
For system disclosed in patent document (CN103470324A), pass through change engines distribution component mechanical structure
Final to realize that disconnected cylinder function, this method need to be reprocessed on existing engine, cost of implementation is higher；Patent document
(CN103204164A) system disclosed in, emphasis describe the torque in hybrid power system between different dynamic source and power demand
Coordination problem can not be suitable for uniform-charge Otto-engine drop and twist off cylinder demand；System disclosed in patent document (CN205400912U),
The quick response for being primarily upon and resolving economy benefit brought by cylinder, but turn round for drop requires not ideal solution party
Method.
Summary of the invention
For above-mentioned problems of the prior art, the technical problem to be solved by the present invention is to have engine drop
In the case where torsion demand, the disconnected cylinder control of engine is carried out in two engine operational cycles, and correct ignition advance angle simultaneously,
The output torque when movements such as engine gears switching can be accurately reduced according to desired torque value, to reach corresponding
Engine torque response requires.
Now basic idea of the present invention and technical solution are described below:
Traditional engine drop torsion method is mainly influenced by engine torque adjustable range and precision, with driver
It is higher and higher to drivability requirement, need the torque adjustable range of engine more flexible, accurate.In the work of automobilism
The case where often will appear the decline of requirement engine output torque moment in condition, such as in engine shifting up operation, need
Engine output torque is reduced rapidly while clutch gradually combines, with reduce shift when mechanical shock, guarantee drive with
The good driving experience of passenger.Thus automobile research and development have really the descent performance of engine output torque with calibration personnel
Fixed demand, it is desirable that while torque value accuracy after guaranteeing to reduce, also to guarantee that torque fall time is rapid.Current automobile
In be widely used and postpone the angle of ignition or stop the oil spout of a certain cylinder or a few cylinders in engine operational cycle and acting reaches rapid
The requirement turned round is dropped.If engine torque is reduced using the method for postponing the angle of ignition, although can be promptly by engine torque
Value reduces, but being limited in scope of reducing of torque, is influenced by torque deposit and angle of ignition efficiency, if reducing excessive, it may appear that start
Machine catches fire phenomenon, cannot be reduced to any torque value completely by adjusting the angle of ignition.If stopping using in engine operational cycle
Only the method for oil spout and the acting of a certain cylinder or a few cylinders is turned round to realize that engine drops, then cannot fully meet the precision of torque reduction
It is required that so that vehicle shift quality decline.By taking 3 cylinder gasoline engines as an example, if shift front engine output torque is 90Nm, change
Target engine output torque is 75Nm after gear, if selection stops a cylinder oil spout in engine operational cycle at this time, finally
Engine torque will will appear at this time the torque deviation of 15Nm, so that driving be caused to reduce for 60Nm or so.
In research of the invention and practice process, inventor's discovery: while using the disconnected cylinder of engine and the angle of ignition is adjusted, and
The disconnected cylinder period is expanded, engine drop can be effectively improved and turn round precision.Basic conception of the invention is started having as a result,
In the case that torsion demand drops in machine, the disconnected cylinder control of engine is carried out in two engine operational cycles, and correct igniting simultaneously and mention
Anterior angle accurately reduces the output torque of engine gears switching, to reach corresponding engine according to desired torque value
Torque responsive requirement.
According to foregoing invention basic conception, the present invention provides a kind of disconnected cylinder drop torsion method of gasoline engine, it is characterised in that: not
Under the premise of increasing conventional engine hardware modification cost, by control unit of engine ECU according to current working by dedicated soft
Part judges disconnected cylinder entry condition, i.e., obtains exterior by ECU and drop torsion demand, by current demand torque and minimum ignition
The angle basic torque of corresponding engine is compared, and judges currently whether carry out disconnected cylinder operation, as carried out disconnected cylinder
Operation then successively carries out it is expected disconnected cylinder number calculating, disconnected cylinder model selection and angle of ignition corrected Calculation, finally issues disconnected cylinder sequence, point
Fiery angle correction, and forbid oxygen closed-loop control；It is issued using two engine operational cycles as a disconnected cylinder control period
Fuel injector oil spout instruction, and the adjusting of the angle of ignition is combined, it is required to reach more accurate drop and turn round, structure such as 1 institute of attached drawing
Show, software flow pattern and main program are as shown in Fig. 7, and steps are as follows for specific method:
Step 1: judged under current working according to the relationship between demand torque in ECU and minimum ignition angle torque whether
Carry out disconnected cylinder control；
Step 1.1: when working as normal vehicle operation, and not occurring fuel cut-off condition, if attainable by adjusting angle of ignition institute
Minimum engine output torque is less than engine demand torque, then i.e. to can reach target engine defeated by adjusting the angle of ignition for explanation
The angle of ignition at this time can be calculated by ECU torque coordination and fiery road torque arithmetic function at this time in torque out；
Step 1.2: if minimum engine output torque be more than or equal to engine demand torque, by engine break cylinder request
Flag set, condition of the mark for the disconnected cylinder strategy of subsequent execution engine, while forbidding air-fuel ratio closed loop control function,
(disconnected cylinder drop twisting structure block diagram is as shown in Fig. 2)；
Step 2: when engine breaks cylinder request flag set, illustrating that system needs to realize engine by disconnected cylinder at this time
Drop, which is turned round, to be required, and is calculated disconnected cylinder drop by following method and is turned round efficiency:
Wherein η is disconnected cylinder efficiency, TqreqFor engine demand torque, TqbasFor the basic torque of engine；
It is calculate by the following formula to obtain and it is expected disconnected cylinder number:
Numcutoff=η × Numcyl×2 (2)
Wherein NumcutoffCylinder number, Num are watched in the distance until it vanishes by a definite datecylFor engine cylinder number, NumcutoffMinimum value is 0, and maximum value is hair
Two times of engine cylinder number；
Step 3: the influence for relieving system demand torque abnormal sudden change to disconnected cylinder needs to resist the disconnected cylinder number of expectation
Interference calculation:；The disconnected cylinder number of expectation that this is calculated is made comparisons with the disconnected cylinder number of the expectation of last computation, if the difference of the two
It is worth larger, then illustrates that disconnected cylinder drop is turned round efficiency and is mutated, the maximum value for it is expected that disconnected cylinder number increases or decreases is limited by increasing
System, it is final to realize the anti-interference calculating for it is expected disconnected cylinder number；
Step 3.1: being that standard selects the disconnected cylinder mode actually executed to watch in the distance until it vanishes cylinder number；
Step 3.2: current to watch in the distance until it vanishes cylinder number NumcutoffWhen less than first disconnected cylinder pattern switching threshold value 1+ThdOfs, selection
Disconnected cylinder mode 0, the disconnected cylinder mode finally executed do not execute disconnected cylinder operation, and wherein ThdOfs is disconnected cylinder mode decision threshold shift
Amount is the parameter that can demarcate modification, and value range is [- 0.5,0.5], and the value of the parameter decides that engine response drop is turned round and needs
It is more likely to disconnected cylinder when asking still to be more likely to postpone the angle of ignition, for adapting to different engine and vehicle performance requirement；
When ThdOfs value is greater than 0, indicate that engine is more likely to realize that drop is turned round by postponing the angle of ignition；When ThdOfs value
When less than 0, indicate that engine is more likely to realize that drop is turned round by disconnected cylinder；
Step 3.3: working as NumcutoffMore than or equal to 1+ThdOfs and less than second disconnected cylinder pattern switching threshold value 2+ThdOfs
When, disconnected cylinder mode 1 is selected, executes a cylinder oil-break, a disconnected cylinder period in a disconnected cylinder period in the disconnected cylinder mode finally executed
Refer to two engine operational cycles；
Step 3.4: working as NumcutoffWhen more than or equal to 2+ThdOfs and being less than the disconnected cylinder mode threshold 3+ThdOfs of third,
Disconnected cylinder mode 2 is selected, executes two cylinder oil-breaks in a disconnected cylinder period in the disconnected cylinder mode finally executed, and so on, until
NumcutoffCylinder number (2* cylinder number)+ThdOfs disconnected more than or equal to maximum, selects disconnected cylinder mode 2* cylinder number, the disconnected cylinder mould finally executed
Whole cylinder oil-breaks in a disconnected cylinder period in formula；
Step 3.5: also needing before disconnected cylinder model selection to NumcutoffHysteresis judgement is carried out, that is, works as NumcutoffGradually increase
When adding, and being more than disconnected cylinder pattern switching threshold value, Num is neededcutoffMore than one hysteresis threshold condition again just carries out disconnected cylinder mode
Switching, if Num at this timecutoffDisconnected between cylinder pattern switching threshold value and hysteresis threshold value, then keep current disconnected cylinder mode constant；
Step 3.6: working as NumcutoffWhen being gradually reduced, and being more than disconnected cylinder pattern switching threshold value, Num is neededcutoffIt is more than again
Hysteresis threshold condition just carries out disconnected cylinder pattern switching, if it is expected disconnected cylinder number Num at this timecutoffDisconnected cylinder pattern switching threshold value with it is stagnant
It returns between threshold value, then keeps current disconnected cylinder mode constant；
Step 4: formulating reasonably disconnected cylinder mode, the basic principle of formulation is that the engine output torque after disconnected cylinder is made to the greatest extent may be used
It can continuously comply with the rules；
Step 4.1: disconnected cylinder mode 0 indicates not executing disconnected cylinder operation within the entire disconnected cylinder period；
Step 4.2: disconnected cylinder mode 1 indicates current cylinder the opening as disconnected cylinder movement when choosing disconnected cylinder request flag set
Begin, stop the oil spout movement of the cylinder, each cylinder in the subsequent same engine operational cycle keeps normal oil spout acting, connects down
The normal oil spout of fuel injector of whole cylinders is kept in the engine operational cycle come and is done work, and is followed with above-mentioned two engine
Ring keeps each cylinder oil spout state in the next disconnected cylinder period constant as a disconnected cylinder period, until disconnected cylinder mode changes,
Or disconnected cylinder request flag resets, system exits disconnected cylinder state；
Step 4.3: disconnected cylinder mode 2 indicates current cylinder the opening as disconnected cylinder movement when choosing disconnected cylinder request flag set
Begin, stops the oil spout movement of the cylinder, each fuel injector movement and this engine operation in subsequent next engine operational cycle
Each fuel injector movement is identical in circulation, using above-mentioned two cycle of engine as a disconnected cylinder period, is kept for the next disconnected cylinder period
Interior each cylinder oil spout state is constant, until disconnected cylinder mode changes or disconnected cylinder request flag resets, system exits disconnected cylinder state；
Step 4.4: and so on, disconnected cylinder mode 3,4 ... 2* cylinder numbers can be successively defined, if NumcutoffInteger portion
It is divided into even number, then each cylinder injector in a disconnected cylinder period in two engine operational cycles is kept strokes, an engine
Fuel injector in working cycles closes number and schedules to last the half for watching in the distance until it vanishes cylinder number integer part, if NumcutoffInteger part be surprise
It is more then to stop stopping oil spout number in than second engine operational cycle of oil spout number for number in first engine operational cycle
One, the principle for needing to abide by each engine operational cycle are as follows: guarantee break in monomotor working cycles cylinder and acting
Interruption is as separated as possible, while considering the acting evenness between two engine operational cycles；
Step 5:. converts engine cylinder number in ECU in the cylinder number in the disconnected cylinder period, with first hair after engine start
Motivation expansion stroke is starting point, identical as disconnected cylinder cylinder number in this engine operational cycle intrinsic motivation cylinder number, adjacent next
In a engine operating cycle, disconnected cylinder cylinder number is followed successively by current cylinder number and most the sum of large cylinder number.Following every two engine work
It is identical to recycle the cylinder cylinder number that breaks in the first two engine operational cycle therewith；
Step 6: the generation of disconnected cylinder sequence: using disconnected cylinder request flag set as starting point, using the acting of a next cylinder as
The starting cylinder in disconnected cylinder period successively determines each cylinder injector oil spout state in the disconnected cylinder period according to selected disconnected cylinder mode；
It when disconnected cylinder mode changes, keeps each cylinder sequence in the disconnected cylinder period constant, and oil spout movement will be executed in next cylinder
Shi Yixin cylinder mode of breaking corresponds to the oil spout state of the cylinder as foundation, come determine fuel injector whether oil spout；
: the calculating of the practical disconnected cylinder number of step 7:.: by nearest 2*NumcylEach cylinder injector in engine expansion stroke
Stop oil spout state number to add up, accumulated result is denoted as Num as practical disconnected cylinder numberCutoffAct, for torquemeter
The correction value of the functions such as calculation；
Step 8: calculating angle of ignition Efficiency correction coefficient when disconnected cylinder drop is turned round: will it is expected that disconnected cylinder number and the difference of practical disconnected cylinder number are made
The drop for turning round control for cylinder drop of breaking turns round deviation, is denoted as NumDelta, it is shown below
NumDelta=NumCutoff-NumCutoffAct (3)
Angle of ignition Efficiency correction coefficient η when drop is turned roundIgCalculation method is shown below
ηIgBy it is counter look into angle of ignition efficiency curve and can be obtained currently need modified ignition angle, using the angle as partially
Shifting adds on basic ignition angle, is finally reached the amendment of the angle of ignition.
The invention has the advantages that under the premise of not increasing engine mechanical structure and electronic device hardware cost,
By the way that addition drop turns round efficiency calculation, drop turns round coordination in ECU control strategy, disconnected cylinder strategy, disconnected cylinder execute and the function such as igniting is corrected
Can, final to realize that engine drop turns round precision and is enhanced about more than once, engine drop turns round effect when improving efficiently vehicle shift, mentions
High vehicle shift ride comfort.
Detailed description of the invention
Fig. 1 is disconnected cylinder drop kink composition of the present invention
Fig. 2 is that disconnected cylinder drop of the present invention turns round control block diagram
Fig. 3 is disconnected cylinder drop torsion method engine rig test result exemplary diagram of the present invention
Fig. 4 is partial enlarged view (its of disconnected cylinder drop torsion method engine rig test result exemplary diagram of the present invention
Figure is shown for the amplification in the 105th second to 106 seconds in 2 test result of attached drawing)
Fig. 5 is that four-cylinder gasoline machine of the present invention cylinder drop of breaking twists off oily mode example figure (specific explanations are shown in specific implementation
The 4th point in scheme)
Fig. 6 is that (specific explanations are shown in specific reality to the disconnected cylinder drop torsion fuel injector movement exemplary diagram of four-cylinder gasoline machine of the present invention
4th point is applied in scheme)
Fig. 7 is that disconnected cylinder drop of the present invention turns round tactical software flow chart and main program example
Specific embodiment
A specific embodiment of the invention is described in further detail with reference to the accompanying drawing:
Refering to attached drawing 2,7: the present invention provides a kind of disconnected cylinders of gasoline engine to drop torsion method, can reach preferably disconnected cylinder drop torsion
Effect.Below by taking certain four cylinder direct injection gasoline engine of 1.2L discharge capacity as an example, entire strategy realization process is using the synchronization signal time in terms of
Calculate step-length；
Step 1. is carried out disconnected cylinder condition by the size relation between demand torque in ECU and minimum ignition angle torque and sentenced
It is disconnected, when working as normal vehicle operation, and not occurring fuel cut-off condition, if by adjusting the attainable minimum engine output of angle of ignition institute
Torque is less than engine demand torque, then turns round at this time without disconnected cylinder drop；Start if minimum engine output torque is more than or equal to
Engine is broken cylinder request flag set, while forbidding air-fuel ratio closed loop control function by machine demand torque；
Step 2: after determining disconnected cylinder condition by engine current torque state, the cylinder request flag set if engine breaks,
Disconnected cylinder drop, which is calculated, by following method turns round efficiency:
Wherein η is disconnected cylinder efficiency, TqreqFor engine demand torque, TqbasFor the basic torque of engine, when engine turns
Speed is 2000 revs/min, when engine load is 75%, the basic torque T q of enginebasIt is 80 Ns meters, if existing at this time outer
Torsion demand, and demand torque Tq drop in portionreqWhen being 58 Ns meters, the disconnected cylinder efficiency being calculated is 27.5%, can pass through following formula meter
Calculation obtains it is expected disconnected cylinder number:
Numcutoff=η × Numcyl×2 (2)
Wherein NumcutoffCylinder number, Num are watched in the distance until it vanishes by a definite datecylFor engine cylinder number, engine cylinder number Num at this timecylIt is 4, foundation
The cylinder number Num it is assumed that the expectation being calculated at this time is brokencutoffIt is 2.2, if choosing disconnected cylinder mode decision threshold shift ThdOfs
It is 0, then NumcutoffGreater than 2；
Step 3: the influence for relieving system demand torque abnormal sudden change to disconnected cylinder needs to resist the disconnected cylinder number of expectation
Interference calculation: is that standard selects the disconnected cylinder mode actually executed, for four cylinder engine, Ke Yishe to watch in the distance until it vanishes cylinder number
Count 9 kinds of disconnected cylinder modes, respectively mode 0,1,2 ... 8.Hysteresis Rule of judgment is added before disconnected cylinder model selection, selects hysteresis
Condition threshold parameter is 0 and 0.1, i.e., current to watch in the distance until it vanishes cylinder number NumcutoffIt gradually increases, and is more than that disconnected cylinder pattern switching threshold value adds
Disconnected cylinder pattern switching is carried out when 0.1, if Num at this timecutoffSubtract in disconnected cylinder pattern switching threshold value and add between 0.1 with the threshold value, then protects
It is constant to hold currently disconnected cylinder mode；Similarly, current to watch in the distance until it vanishes cylinder number NumcutoffIt is gradually reduced, and is more than that disconnected cylinder pattern switching threshold value subtracts 0
Shi Jinhang breaks cylinder pattern switching, if Num at this timecutoffBetween cylinder pattern switching threshold value of breaking again and the threshold value subtract 0, then keep current
Disconnected cylinder mode is constant.Work as NumcutoffWhen less than 1+ThdOfs, disconnected cylinder mode 0 is selected, finally in two engine operational cycles
Disconnected cylinder movement is not executed；Work as NumcutoffWhen more than or equal to 1+ThdOfs and being less than 2+ThdOfs, disconnected cylinder mode 1 is selected, is finally existed
Disconnected cylinder acting movement is executed once in two engine operational cycles；Work as NumcutoffMore than or equal to 2+ThdOfs and it is less than 3+
When ThdOfs, disconnected cylinder mode 2 is selected, cylinder acting movement of breaking twice is finally executed in two engine operational cycles；With such
It pushes away, works as NumcutoffWhen more than or equal to 8+ThdOfs, disconnected cylinder mode 8 is selected, is finally broken in two engine operational cycles complete
Portion's oil spout operation acts, the disconnected cylinder number Num of expectation at this timecutoffIt is 2.2, it has been more than 2+0.1 which, which increases in the process, therefore is selected
Select disconnected cylinder mode 2；
Step 4. formulates reasonably disconnected cylinder mode, can be according in order to keep the engine output torque after disconnected cylinder as continuous as possible
Attached drawing 5,6 designs each fuel injection mode, from oil spout in two engine operational cycles under each fuel injection mode available in Fig. 5,6
Device action sequence, the engine cylinder number shown in Fig. 6 are opposite cylinder number, i.e., cylinder number 1 corresponds to disconnected cylinder drop and turns round enabled (the disconnected cylinder of function
Drop turn round request flag set) when engine physics cylinder number, and as starting cylinder, next eight engine expansion strokes
The period is turned round for a disconnected cylinder drop, finally determines to change disconnected cylinder drop according to disconnected cylinder mode and turns round period each fuel injector action sequence；One
A disconnected cylinder drop was turned round in the period, if leading to the disconnected cylinder mode chosen change due to it is expected disconnected cylinder number variation, corresponding each oil spout
Device movement will be switched to the oil spout sequence of new disconnected cylinder pattern definition at once；Such as request flag set and expectation are turned round when disconnected cylinder drops
Torque T qreqWhen being 58, the disconnected cylinder number Num of expectation is calculatedcutoffIt is 2.2, value is between 2 to 3, and NumcutoffIncrease
When be more than threshold value 2.1, if at this time engine physics cylinder third cylinder will oil spout acting, next by broken third cylinder oil spout,
And the corresponding oil spout sequence of fuel cut-off mode 2 is successively executed, if after executing the 5th oil spout movement in the disconnected cylinder drop torsion period, the phase
Hope torque T qreqBecome 48.5, the expectation being calculated is broken cylinder number NumcutoffIt is 3.15, value is between 3 to 4, and Numcutoff
It is more than threshold value 3.1 when increase, then keeps disconnected cylinder period starting cylinder constant, each fuel injector movement is executed with fuel cut-off mode 3, if when holding
After row turns round second oil spout movement in period to next disconnected cylinder drop, it is expected that torque T qreqBecome 8, the expectation being calculated is broken cylinder
Number NumcutoffIt is 7.2, value is between 7 to 8, and NumcutoffIt is more than threshold value 7.1 when increase, then continues to hold with fuel cut-off mode 7
Each fuel injector of row acts, and corresponding each fuel injector action sequence is as shown in Fig. 6 in above example.Whole process circulation carries out,
Until disconnected cylinder drop is turned round request flag and resetted, then stops disconnected cylinder drop and turn round function；
The calculating of the disconnected cylinder number of step 5. reality: 8 nearest cylinder injectors are stopped into oil spout state number and are added up, are tired out
The result added is as practical disconnected cylinder number, for the correction value to functions such as torque arithmetics；
Step 6. calculates angle of ignition Efficiency correction coefficient when disconnected cylinder drop is turned round: will it is expected that disconnected cylinder number and the difference of practical disconnected cylinder number are made
The drop for turning round control for cylinder drop of breaking turns round deviation, is denoted as NumDelta, it is shown below
NumDelta=NumCutoff-NumCutoffAct (3)
If current watch in the distance until it vanishes cylinder number NumcutoffIt is 7.2, practical disconnected cylinder number NumcutoffActWhen being 7, then torque deviation NumDelta
It is 0.2；
Angle of ignition Efficiency correction coefficient η when drop is turned roundIgCalculation method is shown below
Angle of ignition correction factor η at this timeIgIt is 2.5%, it is therefore desirable under the optimal torque basis that the current angle of ignition calculates
2.5% is reduced, and looks into angle of ignition efficiency curve by the way that the optimal torque is counter, can be obtained and currently need modified ignition angle,
It is added to the angle as offset on basic ignition angle, is finally reached the amendment of the angle of ignition.
The method of the present invention has carried out 3 cylinder machines in threst stand and has broken cylinder drop torsional test, test result such as attached drawing 3 and attached
Shown in Fig. 4, demand torque is down to 35Nm by 125Nm, and final torque responsive precision is less than 5Nm, and the response time is less than 150ms.
Claims (4)
1. a kind of gasoline engine breaks, torsion method drops in cylinder, it is characterised in that: is passed through specially by control unit of engine ECU according to current working
Disconnected cylinder entry condition is judged with software, by the current demand torque basic torque of engine corresponding with minimum ignition angle into
Row compares, and judges currently whether carry out disconnected cylinder operation, successively carries out it is expected disconnected cylinder number if carrying out disconnected cylinder operation
It calculates, break cylinder model selection and angle of ignition corrected Calculation, finally issues disconnected cylinder sequence, igniting angle correction, and forbid oxygen closed loop
Control；Fuel injector oil spout instruction, and binding site are issued as a disconnected cylinder control period using two engine operational cycles
The adjusting at fiery angle, the drop for reaching more accurate, which is turned round, to be required, and steps are as follows for specific method:
Step 1: judged under current working according to the relationship between demand torque in ECU and minimum ignition angle torque whether needs
Carry out disconnected cylinder control；
Step 2: when engine breaks cylinder request flag set, illustrating that system needs to realize that engine drop is turned round by disconnected cylinder at this time
It is required that calculating disconnected cylinder drop by following method turns round efficiency:
Wherein η is disconnected cylinder efficiency, TqreqFor engine demand torque, TqbasFor the basic torque of engine；
It is calculate by the following formula to obtain and it is expected disconnected cylinder number:
Numcutoff=η × Numcyl×2 (2)
Wherein NumcutoffCylinder number, Num are watched in the distance until it vanishes by a definite datecylFor engine cylinder number, NumcutoffMinimum value is 0, and maximum value is engine
Two times of cylinder number；
Step 3: the influence for relieving system demand torque abnormal sudden change to disconnected cylinder needs to carry out the disconnected cylinder number of expectation anti-interference
It calculates；The disconnected cylinder number of expectation that this is calculated and the expectation of last computation the cylinder number that breaks are made comparisons, if the difference of the two compared with
Greatly, then illustrate that disconnected cylinder drop is turned round efficiency and is mutated, the maximum value for it is expected that disconnected cylinder number increases or decreases is limited by increasing, most
The anti-interference calculating for it is expected disconnected cylinder number is realized eventually；
Step 4: formulating reasonably disconnected cylinder mode, the basic principle of formulation is to connect the engine output torque after disconnected cylinder as far as possible
Continuous complies with the rules；
Step 5: the cylinder number in the disconnected cylinder period is converted by engine cylinder number in ECU, with first engine after engine start
Expansion stroke is starting point, identical as disconnected cylinder cylinder number in this engine operational cycle intrinsic motivation cylinder number, in adjacent next hair
In the motivation duty cycle, disconnected cylinder cylinder number is followed successively by current cylinder number and most the sum of large cylinder number；Following every two engine operation is followed
The ring cylinder cylinder number that breaks in the first two engine operational cycle therewith is identical；
Step 6: the generation of disconnected cylinder sequence: using disconnected cylinder request flag set as starting point, using the acting of a next cylinder as disconnected cylinder
The starting cylinder in period successively determines each cylinder injector oil spout state in the disconnected cylinder period according to selected disconnected cylinder mode；When disconnected
When cylinder mode changes, keep each cylinder sequence in the disconnected cylinder period constant, and when next cylinder will execute oil spout movement with
New disconnected cylinder mode corresponds to the oil spout state of the cylinder as foundation, come determine fuel injector whether oil spout；
Step 7: the calculating of practical disconnected cylinder number: by nearest 2*NumcylEach cylinder injector in engine expansion stroke stops spray
Oil condition number adds up, and accumulated result is denoted as Num as practical disconnected cylinder numberCutoffAct, for function such as torque arithmetics
The correction value of energy；
Step 8: calculating angle of ignition Efficiency correction coefficient when disconnected cylinder drop is turned round: the difference of disconnected cylinder number and practical disconnected cylinder number will it is expected as disconnected
The drop that cylinder drop turns round control turns round deviation, is denoted as NumDelta, it is shown below
NumDelta=NumCutoff-NumCutoffAct (3)
Angle of ignition Efficiency correction coefficient η when drop is turned roundIgCalculation method is shown below
ηIgBy it is counter look into angle of ignition efficiency curve and can be obtained currently need modified ignition angle, using the angle as offset plus
To basic ignition angle, it is finally reached the amendment of the angle of ignition.
2. a kind of gasoline engine according to claim 1 breaks, torsion method drops in cylinder, it is characterised in that: " judgement described in step 1
Whether disconnected cylinder control is carried out under current working " specific step is as follows:
Step 1.1: when working as normal vehicle operation, and not occurring fuel cut-off condition, if by adjusting the attainable minimum of angle of ignition institute
Engine output torque is less than engine demand torque, then explanation is that can reach target engine output to turn round by adjusting the angle of ignition
The angle of ignition at this time can be calculated by ECU torque coordination and fiery road torque arithmetic function at this time in square；
Step 1.2: if minimum engine output torque is more than or equal to engine demand torque, engine being broken cylinder request flag
Set, condition of the mark for the disconnected cylinder strategy of subsequent execution engine, while forbidding air-fuel ratio closed loop control function.
3. a kind of gasoline engine according to claim 1 breaks, torsion method drops in cylinder, it is characterised in that: " realizes described in step 3
It is expected that the anti-interference calculating of disconnected cylinder number " specific step is as follows:
Step 3.1: being that standard selects the disconnected cylinder mode actually executed to watch in the distance until it vanishes cylinder number；
Step 3.2: current to watch in the distance until it vanishes cylinder number NumcutoffWhen less than first disconnected cylinder pattern switching threshold value 1+ThdOfs, disconnected cylinder is selected
Mode 0, the disconnected cylinder mode finally executed do not execute disconnected cylinder operation, and wherein ThdOfs is disconnected cylinder mode decision threshold shift, is
The parameter of modification can be demarcated, value range is [- 0.5,0.5], when the value of the parameter decides that torsion demand drops in engine response
It is more likely to disconnected cylinder to be still more likely to postpone the angle of ignition, for adapting to different engine and vehicle performance requirement；When
When ThdOfs value is greater than 0, indicate that engine is more likely to realize that drop is turned round by postponing the angle of ignition；When ThdOfs value is less than
When 0, indicate that engine is more likely to realize that drop is turned round by disconnected cylinder；
Step 3.3: working as NumcutoffWhen more than or equal to 1+ThdOfs and less than second disconnected cylinder pattern switching threshold value 2+ThdOfs,
Disconnected cylinder mode 1 is selected, executes a cylinder oil-break in a disconnected cylinder period in the disconnected cylinder mode finally executed, a disconnected cylinder period refers to two
A engine operational cycle；
Step 3.4: working as NumcutoffWhen more than or equal to 2+ThdOfs and being less than the disconnected cylinder mode threshold 3+ThdOfs of third, selection
Disconnected cylinder mode 2 executes two cylinder oil-breaks in a disconnected cylinder period in the disconnected cylinder mode finally executed, and so on, until Numcutoff
Cylinder number (2* cylinder number)+ThdOfs disconnected more than or equal to maximum, selects disconnected cylinder mode 2* cylinder number, one in the disconnected cylinder mode finally executed
Whole cylinder oil-breaks in the disconnected cylinder period；
Step 3.5: also needing before disconnected cylinder model selection to NumcutoffHysteresis judgement is carried out, that is, works as NumcutoffIt gradually increases,
And when being more than disconnected cylinder pattern switching threshold value, need NumcutoffMore than one hysteresis threshold condition again just carries out disconnected cylinder mode and cuts
It changes, if Num at this timecutoffDisconnected between cylinder pattern switching threshold value and hysteresis threshold value, then keep current disconnected cylinder mode constant；
Step 3.6: working as NumcutoffWhen being gradually reduced, and being more than disconnected cylinder pattern switching threshold value, Num is neededcutoffIt is again more than hysteresis
Threshold condition just carries out disconnected cylinder pattern switching, if it is expected disconnected cylinder number Num at this timecutoffIn disconnected cylinder pattern switching threshold value and hysteresis threshold
Between value, then keep current disconnected cylinder mode constant.
4. a kind of gasoline engine according to claim 1 breaks, torsion method drops in cylinder, it is characterised in that: " formulates described in step 4
Reasonably disconnected cylinder mode, the basic principle of formulation are that the engine output torque after disconnected cylinder is made continuously to comply with the rules as far as possible "
Specific step is as follows:
Step 4.1: disconnected cylinder mode 0 indicates not executing disconnected cylinder operation within the entire disconnected cylinder period；
Step 4.2: disconnected cylinder mode 1 indicates beginning of current cylinder when choosing disconnected cylinder request flag set as disconnected cylinder movement, stops
Only the oil spout of the cylinder acts, and each cylinder in the subsequent same engine operational cycle keeps normal oil spout acting, next
The normal oil spout of fuel injector of whole cylinders is kept in one engine operational cycle and is done work, with above-mentioned two cycle of engine work
For a disconnected cylinder period, keep each cylinder oil spout state in the next disconnected cylinder period constant, until disconnected cylinder mode changes or disconnected cylinder
Request flag resets, and system exits disconnected cylinder state；
Step 4.3: disconnected cylinder mode 2 indicates beginning of current cylinder when choosing disconnected cylinder request flag set as disconnected cylinder movement, stops
Only the oil spout of the cylinder acts, in subsequent next engine operational cycle in each fuel injector movement and this engine operational cycle
Each fuel injector movement is identical, using above-mentioned two cycle of engine as a disconnected cylinder period, keeps each cylinder in the next disconnected cylinder period
Oil spout state is constant, until disconnected cylinder mode changes or disconnected cylinder request flag resets, system exits disconnected cylinder state；
Step 4.4: and so on, disconnected cylinder mode 3,4 ... 2* cylinder numbers can be successively defined, if NumcutoffInteger part be
Even number, then each cylinder injector in a disconnected cylinder period in two engine operational cycles is kept strokes, an engine operation
Fuel injector in circulation closes number and schedules to last the half for watching in the distance until it vanishes cylinder number integer part, if NumcutoffInteger part be odd number, then
Stop in than second engine operational cycle of oil spout number one more than stopping oil spout number in first engine operational cycle,
The principle for needing to abide by each engine operational cycle are as follows: guarantee to break cylinder in monomotor working cycles and do work interruption to the greatest extent
It may separate, while consider the acting evenness between two engine operational cycles.
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