CN103573439B - Control of engine speed electric-control method - Google Patents
Control of engine speed electric-control method Download PDFInfo
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- CN103573439B CN103573439B CN201310544145.3A CN201310544145A CN103573439B CN 103573439 B CN103573439 B CN 103573439B CN 201310544145 A CN201310544145 A CN 201310544145A CN 103573439 B CN103573439 B CN 103573439B
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Abstract
The invention discloses a kind of control of engine speed electric-control method, comprise the steps: to judge vehicle operating gear: vehicle operating gear, for the most high-grade and inferior when high-grade, is controlled and finished, when vehicle operating gear be low grade; Judge engine operation area: according to the universal characteristic curve of engine, engine operation area is divided into economical operation district and non-economy Operational Zone, separate with area limit line economical operation district and non-economy Operational Zone, on area limit line, comprise the economic zone rotating speed critical value of various operating modes, thereby obtain high rotating speed critical value and the slow-speed of revolution critical value in economical operation district, if engine operates in economical operation district, control and finish, if engine operates in non-economy Operational Zone; According to the operating mode of engine, engine speed is adjusted into corresponding economic zone rotating speed critical value on area limit line. The present invention is the rotating speed under low speed underloading situation by limiting engine, thereby improves the fuel economy of car load.
Description
Technical field
The present invention relates to field of engine control, refer to that particularly a kind of control of engine speed is automatically controlledMethod.
Background technology
Along with national legislation is more and more tighter to vehicle diesel engine emission request, discharge upgrading bandThe rising of the engine use cost of coming, making oil consumption problem is diesel car user special concernTopic, lifting vehicle fuel economy is the important class of engine research, development manufacturing alwaysTopic.
Summary of the invention
Object of the present invention is exactly to provide a kind of engine of lifting vehicle fuel economy to turnSpeed control electric-control method processed.
For achieving the above object, the control of engine speed electric-control method that the present invention is designed, itsSpecial character is, described method comprises the steps:
Step 1: judge vehicle operating gear: vehicle operating gear is for the most high-grade and inferior when high-grade,Control and finish, when vehicle operating gear is low-grade, turn to step 2;
Step 2: judge engine operation area: according to the universal characteristic curve (Fuel of engineMap), engine operation area is divided into economical operation district and non-economy Operational Zone, described economySeparate with area limit line Operational Zone and non-economy Operational Zone, comprises each on described area limit lineThe economic zone rotating speed critical value of kind of operating mode, thus obtain economical operation district high rotating speed critical value andSlow-speed of revolution critical value, if engine operates in economical operation district, controls and finishes, if sent outMotivation operates in non-economy Operational Zone, turns to step 3;
Step 3: engine speed is adjusted into phase on area limit line according to the operating mode of engineThe economic zone rotating speed critical value of answering.
Further, before step 1, also comprise and judge vehicle gear box type step: judgementVehicle gear box type, gearbox is automatic gear-box, controls and finishes, gearbox is manually to becomeSpeed case, turns to step 1. It is of the present invention that the gearbox of vehicle is that automatic gear-box is not suitable forControl of engine speed electric-control method.
Further, between step 1 and step 2, also comprise and judge car load step:Judge car load according to the vehicle weight calculating, when vehicle is heavy duty, controls and finish, carWhile being underloading, turn to step 2. When vehicle is heavy duty, the low-speed dynamic performance having needed,To affect Vehicle Driving Cycle if rotating speed is too low when engine operates in low or first gear, not be suitable for thisBright control of engine speed electric-control method.
Further, the method for described calculating vehicle weight is that vehicle weight equals Vehicle Driving CycleDrag overall and the ratio of vehicle acceleration. According to following formula: the drag overall F of Vehicle Driving Cycle(concrete resistance calculates public always=F resistance to rolling+F air drag+F grade resistance+F acceleration resistanceFormula can be with reference to " automobile theory ") equal engine output power, moving according to engine outputPower torque value and vehicle acceleration, calculate vehicle weight according to Newton's second law (m=F/a)Amount.
Further, between car load step and step 2, also comprise judgement climbing judgingThe step of operating mode: judgement climbing operating mode, by relative speed variation and the rotation speed change of engine operationRate is demarcated setting value relatively, if the relative speed variation of engine operation is greater than relative speed variation markFixed setting value, controls and finishes, and is less than if the relative speed variation of engine operation is demarcated setting valueRelative speed variation is demarcated setting value, turns to step 2. The drag overall F of Vehicle Driving Cycle is total=and F rollsResistance+F air drag+F grade resistance+F acceleration resistance (can join by concrete resistance calculation formulaeExamine " automobile theory ") equal engine output power, when vehicle working condition runs to climbing operating modeTime, F drag overall meeting is greater than engine output power, thereby cause engine speed decline orCar speed declines, and has in the method a real-time engine speed rate of change comparison,In the time that the relative speed variation of engine is greater than a demarcation setting value, can judge engine placeIn climbing operating mode. In the time that vehicle is climbed, the low-speed dynamic performance also having needed, engine torqueStrengthen, will affect Vehicle Driving Cycle if engine speed is too low, be not suitable for of the present invention startingMachine rotating speed control electric-control method.
Operation principle of the present invention: in the time that the speed of a motor vehicle is lower, windage and road resistance are all lower,Now engine operation, compared with under the slow-speed of revolution, also can obtain good dynamic property. Based on suchConsider, engine speed when this characteristic method restriction low-grade location reduces engine at height as far as possibleThe running time in speed non-economy district, thus oil consumption indirectly improved.
The control of engine speed electric-control method that the present invention is designed, by limiting vehicle in low gradeThe engine speed of position when underloading, operates in the rotating speed of economic zone engine as far as possible, thereby carriesThe fuel economy of high car load.
Brief description of the drawings
Fig. 1 is the schematic diagram of a kind of control of engine speed electric-control method of the present invention;
Fig. 2 is the universal characteristic curve figure (FuelMap) of test engine;
In figure: economic zone 1, non-economy district 2, the highest economic zone rotating speed critical value A, minimum warpJi district rotating speed critical value B, area limit line P.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of control of engine speed electric-control method, comprises the steps:
Judge vehicle gear box type, gearbox is automatic gear-box, controls and finishes, gearboxFor manual transmission, turn to step 1.
Step 1: judge vehicle operating gear, vehicle operating gear is for the most high-grade and inferior when high-grade,Control and finish, when vehicle operating gear is low-grade, judge car load and vehicle climbing operating mode;
1.1: the step that judges car load: judge car load according to the vehicle weight calculating,When vehicle is heavy duty, controls and finish, when vehicle is underloading, turn to next step.
1.2: the step of judgement climbing operating mode: judgement climbing operating mode, by the rotating speed of engine operationRate of change and relative speed variation are demarcated setting value relatively, if the relative speed variation of engine operationBe greater than relative speed variation and demarcate setting value, control and finish, if the rotation speed change of engine operationRate is demarcated setting value and is less than relative speed variation demarcation setting value, goes to step two.
Step 2: judge engine operation area: according to the universal characteristic curve (Fuel of engineMap), engine operation area is divided into economical operation district 1 and non-economy Operational Zone 2, economySeparate with area limit line P Operational Zone 1 and non-economy Operational Zone 2, the upper bag of area limit line PDraw together the economic zone rotating speed critical value of various operating modes, thereby it is critical to obtain the high rotating speed in economical operation districtValue A and slow-speed of revolution critical value B, if engine operates in economical operation district 1, control knotBundle, if engine operates in non-economy Operational Zone 2, turns to step 3;
Step 3: engine speed is adjusted on area limit line P according to the operating mode of engineCorresponding economic zone rotating speed critical value.
Operation principle of the present invention is: control of engine speed electric-control method is sentenced according to characteristic functionsDisconnected limiting engine rotating speed is to improve fuel economy. Control of engine speed electric-control method characteristicThe prerequisite of controlling is that vehicle gear box is that manual transmission, vehicle operating gear are for low-gradePosition, underloading (except when vehicle heavy duty and upward slope), determination methods is as follows:
A, gearbox-type judgement: electronic control module (ECM) is sentenced by vehicle drive system settingWhether disconnected vehicle gear box is manual transmission;
B, gear judgement: electronic control module (ECM) is by engine speed, the speed of a motor vehicle and power trainParameter can calculate the gearratio of gearbox, and computational process is as follows:
Gear ratio calculation formula: the speed of a motor vehicle (km/hr)=vehicle speed sensor umber of pulse (cnt/sec)* 3600(sec/hr)/rear axle ratio/tire size (revs/km)/tailing axle number of teeth (cnt/rev)
Just can calculate rear axle ratio according to current vehicle speed and engine speed: wherein the speed of a motor vehicle passesAfter sensor umber of pulse is relevant with engine speed, tire size and the tailing axle number of teeth be all vehicle couplingPreset parameter
Inferior top grade and the judgement of the most high-grade gear arrange:
ECM is by engine speed, and the speed of a motor vehicle and Train Parameters can calculate the reality of gearboxBorder gearratio, if:
The actual transmission ratio of gearbox > inferior high-grade gear setting value, ECM thinks gearboxIn low-grade state.
Inferior high-grade gear setting value > the actual transmission ratio of gearbox > high tap position setting value,ECM thinks that gearbox is in inferior high-grade state.
The actual transmission ratio of gearbox > high tap position setting value, ECM think gearbox inThe most high-grade state.
C, car load judge: judge that according to the setting magnitude of load of car load standard configuration vehicle is for heavy dutyOr underloading, according to the setting load of car load standard configuration, by 85%～90% of set vehicle loadBe set as car load scalar quantity, by larger to vehicle weight and the gauged value of car loadLittle of to judge that vehicle is as heavy duty or underloading, if vehicle weight is greater than car load scalar quantity,Judge that vehicle is heavy duty; If vehicle weight is less than car load scalar quantity, judge carBe underloading. For example, coupling vehicle normal loading is 25 tons, can in demarcation, establishThe car load scalar quantity of determining car load standard configuration is 23 tons. The method of calculating vehicle weight is carWeight equals the drag overall of Vehicle Driving Cycle and the ratio of vehicle acceleration. According to following public affairsFormula: the drag overall F of Vehicle Driving Cycle is total=F resistance to rolling+F air drag+F grade resistance+ F acceleration resistance (concrete resistance calculation formulae can with reference to " automobile theory ") equals to startMachine outputting power, according to engine output power torque value and vehicle acceleration, according to newtonSecond law (m=F/a) calculates vehicle weight.
D, the judgement of vehicle climbing operating mode: in the time that vehicle working condition runs to climbing operating mode, F drag overallCan be greater than engine output power, thereby cause under engine speed decline or car speedFall, have in the method a real-time engine speed rate of change comparison, work as engineRelative speed variation be greater than one and demarcate when setting value, can judge that engine is in climbingOperating mode. The computing formula of the drag overall of Vehicle Driving Cycle be F total=resistance of F resistance to rolling+F air(concrete resistance calculation formulae can be with reference to " automobile reason for power+F grade resistance+F acceleration resistanceOpinion ").
Working region of the present invention explanation: the operation area of engine is divided into economy by automatically controlled characteristicOperational Zone (NormalOperatingRange) 1 and non-economy Operational Zone 2(ExtendedOperatingRange) two operation areas, the division in this region by client according to engine ten thousandHave characteristic curve (FuelMap) self-defined, economical operation district 1 and non-economy Operational Zone 2 withArea limit line P separates, and comprises that the economic zone rotating speed of various operating modes is critical on area limit line PValue, thus high rotating speed critical value (HighEngineSpeedBreakpoint) A and low obtainedRotating speed critical value (LowEngineSpeedBreakpoint) B, the economic zone of various operating modes turnsSpeed critical value can be asked with difference arithmetic according to high rotating speed critical value A and slow-speed of revolution critical value BGo out. High rotating speed critical value A and slow-speed of revolution critical value B also can make according to driver habit micro-Adjust. Move in economical operation district 1, when engine is in the time that little throttle responds, engine allowsMaximum engine rotation speed be slow-speed of revolution critical value B, when engine is during in the response of full throttle,The maximum engine rotation speed that engine allows is high rotating speed critical value A. In the work of high power requirementsUnder condition, for example vehicle rising abrupt slope, when cornering force and Tire Friction become excessive etc., startsMachine allows at non-economy Operational Zone 2 area operations.
Embodiment:
On ISLe40040 h type engine h, use this control of engine speed electric-control method, thisThe gearbox of motivation is manual transmission, and engine Specifeca tion speeification is as shown in table 1:
Table 1
Universal characteristic curve of engine (FuelMap) as depicted in figs. 1 and 2, according to clientRequirement arranges economical operation district 1 and non-economy Operational Zone 2, and both are separated by area limit line P,Obtain high rotating speed critical value A as 2000 taking this, slow-speed of revolution critical value B is 1600, and this car is establishedThe setting load of determining car load standard configuration is 23T, is not with trailer, light running when experiment. To not openingWith LBSC with enable LBSC and carried out oil consumption contrast test, experimental result is as shown in table 2:
Table 2
As above shown in the experimental result of table, after use the present invention, reduced by 2.28% fuel consume.
Claims (3)
1. a control of engine speed electric-control method, is characterized in that: comprise the steps:
Step 1: judge vehicle operating gear: vehicle operating gear, for the most high-grade and inferior when high-grade, is controlled and finished, and when vehicle operating gear be low grade, turns to step 2;
Step 2: judge engine operation area: according to the universal characteristic curve of engine, engine operation area is divided into economical operation district (1) and non-economy Operational Zone (2), separate with area limit line (P) described economical operation district (1) and non-economy Operational Zone (2), on described area limit line, (P) comprises the economic zone rotating speed critical value of various operating modes, thereby obtain high rotating speed critical value (A) and the slow-speed of revolution critical value (B) in economical operation district, if engine operates in economical operation district, control and finish, if engine operates in non-economy Operational Zone, turn to step 3,
Step 3: engine speed is adjusted into the upper corresponding economic zone of area limit line (P) rotating speed critical value according to the operating mode of engine;
Before step 1, also comprise and judge vehicle gear box type step:
Judge vehicle gear box type, gearbox is automatic gear-box, controls and finishes, and gearbox is manual transmission, turns to step 1;
Between described step 1 and step 2, also comprise and judge car load step:
Judge car load according to the vehicle weight calculating, when vehicle is heavy duty, control and finish, when vehicle is underloading, turn to step 2, wherein, according to the setting load of car load standard configuration, be set as car load scalar quantity by 85%～90% of set vehicle load, by big or small to judge that vehicle is as heavy duty or underloading to vehicle weight and the gauged value of car load, if vehicle weight is greater than car load scalar quantity, judge that vehicle is heavy duty; If vehicle weight is less than car load scalar quantity, judge that vehicle is underloading.
2. control of engine speed electric-control method according to claim 1, is characterized in that: the computational methods of described vehicle weight are that vehicle weight equals the drag overall of Vehicle Driving Cycle and the ratio of vehicle acceleration.
3. control of engine speed electric-control method according to claim 1, is characterized in that: judging the step that also comprises judgement climbing operating mode between car load step and step 2:
Judgement climbing operating mode: the relative speed variation of engine operation and relative speed variation are demarcated to setting value relatively, if being greater than relative speed variation, the relative speed variation of engine operation demarcates setting value, control and finish, demarcate setting value if the relative speed variation of engine operation is less than relative speed variation, turn to step 2.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104354696B (en) * | 2014-11-07 | 2017-03-29 | 奇瑞汽车股份有限公司 | passenger car oil consumption control method |
| CN107989707A (en) * | 2017-12-05 | 2018-05-04 | 安徽华菱汽车有限公司 | Heavy-duty vehicle and its ECU, racing of the engine suppression system and suppressing method |
| CN108104959A (en) * | 2017-12-13 | 2018-06-01 | 天津雷沃发动机有限公司 | A kind of non-road engines electronic controlled power output control method |
| CN108398964A (en) * | 2018-02-08 | 2018-08-14 | 西北工业大学 | A kind of scooter starts and method for control speed |
| CN111059279B (en) * | 2019-12-31 | 2021-06-22 | 广西玉柴机器股份有限公司 | Advanced gear shifting reminding control method and system for commercial vehicle |
| CN112594079B (en) * | 2020-12-07 | 2022-09-06 | 一汽解放汽车有限公司 | Method and device for determining rotational speed economic region of engine, vehicle and storage medium |
| CN116877288B (en) * | 2023-09-08 | 2023-12-15 | 潍柴动力股份有限公司 | Engine control method, unit, system, automobile power assembly and automobile |
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