CN104568467A - Method for detecting bench-testing fuel consumption or emission of heavy duty vehicle - Google Patents
Method for detecting bench-testing fuel consumption or emission of heavy duty vehicle Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000001052 transient effect Effects 0.000 claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 15
- 230000001133 acceleration Effects 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012937 correction Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 6
- 238000007689 inspection Methods 0.000 claims description 10
- 238000013519 translation Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 5
- 231100000331 toxic Toxicity 0.000 claims description 5
- 230000002588 toxic effect Effects 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting bench-testing fuel consumption or emission of a heavy duty vehicle, and belongs to the field of detecting fuel consumption or emission under the bench-testing simulation road test constant speed working condition or the transient working condition of the heavy duty vehicle. According to transient working condition bench testing, bench-testing detection can be conducted only after the comprehensive power performance of the vehicle is judged to be qualified through a calculation method, and the weight of a vehicle drive shaft should not be smaller than the minimum adhesion weight. The road test resistance at the same traveling speed minus the entire system resistance of a vehicle roller equals the power absorption device loading force under the constant speed working condition, the bench-testing power absorption device loading force under the acceleration working condition is based on the constant speed working condition, inertia acceleration resistance further needs to be superposed, and sensor vibrating force can be superposed or not be superposed. Under the condition that the requirement for engine output torque and rotating speed characteristics is met, high gear measurement within the continuous set time is selected, the rotating speed of an engine needs to be larger than or equal to the minimum stable rotating speed in the upshift process, and the correction fuel consumption can be calculated.
Description
Technical field
The detection method of heavy goods vehicles bench teat Fuel Consumption or discharge, being heavy goods vehicles intends fully loaded vehicle cruising mode or the examination of transient condition road in chassis dynamometer die trial of appearing on the stage, detect a kind of detection method of Fuel Consumption or toxic emission, belong to automotive performance Platform test technical field.
Background technology
Existing fully loaded heavy goods vehicles cruising mode or transient condition detect Fuel Consumption or toxic emission, cruising mode's normally road examination, transient condition is normally by GB GB/T27840-2011 " heavy type commercial vehicle Fuel Consumption measuring method ", vehicle chassis dynamometer appear on the stage die trial intend transient condition road examination C-WTVC circulation detect Fuel Consumption or toxic emission, there are following some shortcomings: 1, chassis dynamometer characteristic imperfection, lack flywheel group equivalent inertia grade characteristic etc.; 2, the operability that the average correction time adopting vehicle to slide on stand adjusts chassis dynamometer heap(ed) capacity is bad; 3, when chassis dynamometer equivalent inertia is not equal to the equivalent translation inertia of vehicle, bench teat does not have specification simulation loading power; 4, the necessary condition imperfection of wheel box gear is determined; 5, vehicle comprehensive dynamic is not evaluated; 6, the minimum adhesion weight of driving shaft is not calculated.Adopt the detection method of heavy goods vehicles bench teat Fuel Consumption or discharge can overcome these deficiencies.Transient condition comprises vehicle idling, acceleration, constant speed, deceleration, and cruising mode is transient state accelerating mode acceleration is the special case of 0.
Summary of the invention
Fully loaded heavy goods vehicles bench teat has following characteristics: it is very large from the scope of 3.5 tons ~ 50 tons that heavy goods vehicles is fully loaded with total quality, at cruising mode's bench teat then without the need to considering the equivalent inertia of stand.Needed for simulation transient state accelerating mode bench teat, stand equivalent inertia is large, needs inertial flywheel group; Loading load will prevent more greatly empty-car driving wheel load less than normal from trackslipping on cylinder; Heavy goods vehicles wheel box gear quantity and ratio disparities are difficult to more greatly unified gear, the Fuel Consumption of same vehicle cruising mode or the different gear of accelerating mode differs greatly, for ensureing to detect accurately and the unitarity of operation, need clearly high gear principle: higher gear must be adopted meeting under engine output torque and rotary speed property condition, and determine that higher gear must calculation engine torque load and rotating speed.
1, improve chassis dynamometer characteristic: heavy vehicle chassis dynamometer should have three axle cylinders, double drive axle heavy goods vehicles can be suitable for and detect; The stand flywheel group inertia of accelerating mode bench teat is differential should 2 tons ~ 10 tons scopes, and then simulation accelerated inertia resistance less than normal is less, and be saving steel and reduction volume, front, intermediate roll diameter is unsuitable excessive; Ensure transient equilibrium and the assembly precision of gantry rotation part, vehicle average and maximum vibration power of art skating on stand is the smaller the better, should be less than or equal to the equivalent translation inertia (vehicle total quality and non-driven wheel equivalent inertia sum) of vehicle in conjunction with the stand inertia after flywheel.
If 2 adopt Retarder as device for power absorption, consider the heat fading of Retarder, leave the load capability reserve factor of 1.2 ~ 2.5, water-cooled Retarder gets coefficient less than normal, and coefficient bigger than normal got by wind cooling eddy current machine.
3, vehicle on road examination obtains coefficient of rolling resistance formula under standard ambient condition and coefficient of air resistance formula, or when vehicle is the road examination corresponding coefficient formula that modification vehicle then can refer to basic vehicle, or by Chinese invention patent application " automobile multi-state road examination Fuel Consumption analog computation detection method ", application number: 201410444250.4, with the corresponding coefficient formula of class of vehicle statistics belonging to inspection vehicle, calculate each speed of a motor vehicle road examination running resistance of institute's inspection vehicle.
4, cruising mode's Platform test is without the need to judging the comprehensive dynamic of vehicle, transient condition Platform test first need judge the comprehensive dynamic of vehicle, after engine torque external characteristic curve or the datumization of engine output net torque external characteristic curve, in the scope of engine stabilizer rotating speed, be not more than δ × Me to judge by each gear calculation engine moment of resistance of each speed of a motor vehicle point of circulation, in formula: δ is engine torque coefficient, normally slightly larger than or equal 1; Me is the engine output torque of corresponding gear speed of a motor vehicle point.First calculate the engine torque load of each speed of a motor vehicle point, if by instantaneous acceleration or average acceleration calculation engine torque load in certain accelerating mode overall process, in the engine stabilizer range of speeds, each gear has multiple point to exceed prescribed torque limit value δ × Me, can judge that the comprehensive dynamic of vehicle is defective, namely the actual travel of this accelerating mode cannot be realized theoretically, transient state circulation cannot be completed and do not carry out bench teat, only have and load detection by the qualified rear bench teat that just carries out of the comprehensive dynamic of computing method.
5, the loading load of cruising mode's bench teat is relatively little, without the need to calculating the minimum adhesion weight of driving shaft.Transient condition bench teat, for the lighter empty-car of non-passenger vehicle class vehicle driving shaft, for preventing wheel and cylinder from trackslipping, should calculate the minimum adhesion weight G=2 × a × M × cos ψ/Φ of examined vehicle drive shaft, unit N, in formula: a is regulation acceleration, unit m/s
2; M is by being examined vehicular gross combined weight, units/kg; ψ is the angle of setting of wheel on cylinder; Φ is that wheel roller adhesion coefficient is about 0.6, as vehicle drive shaft weight is less than minimum adhesion weight, can make it to be greater than minimum adhesion weight to driving shaft weightening finish.
6, the vehicle bench teat resistance formula of neutral position sliding measuring vehicle cylinder whole system and force snesor vibration force of each speed of a motor vehicle on stand, the road examination resistance of the same speed of a motor vehicle deducts the device for power absorption loading force that bench teat resistance is this speed of a motor vehicle cruising mode, if the relative total load ratio of force snesor vibration force is comparatively large, the loading force of device for power absorption can superposition vibration force.
7, accelerating mode bench teat loading force is on the basis of cruising mode's bench teat loading force, and the difference of superposition vehicle equivalence translation inertia and stand equivalent inertia to be multiplied by the inertia acceleration resistance of regulation acceleration, idling and decelerating mode device for power absorption do not load.
8, bench teat accelerating mode process, will according to the associated technical parameters such as engine, wheel box, primary actuator, vehicle body logging in vehicle, calculation engine torque load and rotating speed determine higher gear, the minimum length in time of gear will be considered simultaneously, avoid too shift hunting, the minimum length in time as risen three gears is not less than 3s; The upshift minimum length in time being more than or equal to four gears is not less than 6s; The duration of downshift is not less than 3s, and engine speed is greater than its minimum stable engine speed just upshift.
9, detection Fuel Consumption is corrected under standard ambient condition, be conducive to accurately comparing and evaluating, calculate correction fuel consumption Q
school=Q
inspection/ a, Q
inspectionfor detecting Fuel Consumption, a is engine capacity correction coefficient.
The detection method of heavy goods vehicles bench teat Fuel Consumption or discharge, being heavy goods vehicles detects a kind of method of Fuel Consumption or discharge at appear on the stage examination simulation road examination cruising mode or transient condition of chassis dynamometer, it is characterized in that: transient condition bench teat will after engine output torque curve data, judge that vehicle comprehensive dynamic is qualified by computing method and just carry out Platform test afterwards, on the chassis dynamometer with three axle cylinders, transient condition bench teat, for the lighter empty-car of non-passenger vehicle class driving shaft, for preventing wheel and cylinder from trackslipping, should make vehicle drive shaft weight be not less than minimum adhesion weight, first determine that vehicle rolling resistance formula and air resistance formula are to calculate each speed of a motor vehicle road examination resistance, then the vehicle resistance formula of neutral position sliding measuring vehicle cylinder whole system and force snesor vibration force of each speed of a motor vehicle on stand, the road examination resistance of the same speed of a motor vehicle deducts the device for power absorption loading force that vehicle cylinder whole system resistance is cruising mode, accelerating mode bench teat device for power absorption loading force is on the basis of cruising mode's loading force, the difference of superposition vehicle equivalence translation inertia and stand equivalent inertia is also wanted to be multiplied by the inertia acceleration resistance of regulation acceleration, can superposition or afterburning sensor vibration power without end, accelerating mode bench teat is by the vehicle associated technical parameters logged in, calculation engine torque load and rotating speed, meeting under engine output torque and rotary speed property, the higher gear continuing the stipulated time is selected to measure Fuel Consumption or toxic emission, during upshift, engine speed is greater than and equals its minimum stable engine speed, in good time prompting is put into gear and is operated, and can calculate correction fuel consumption Q
school=Q
inspection/ a, Q
inspectionfor detecting Fuel Consumption, a is engine capacity correction coefficient.
Embodiment
For same storehouse grid lorry cruising mode's bench teat and transient condition bench teat measurement fuel consumption per hundred kilometers respectively, the embodiment of the detection method of heavy goods vehicles bench teat Fuel Consumption or discharge is described:
1, with reference to JT719-2008 " operation truck fuel consumption limit value and measuring method ", at 40km/h, 50km/h, 60km/h, 70km/h, 80km/h five constant speed points measure fuel consumption per hundred kilometers, and then calculate comprehensive fuel consumption per hundred kilometers by weight coefficient, vehicle parameter: kerb weight 12050kg, gross mass 24110kg, tire classification is bias tire, vehicle commander 11995mm, overall width 2495mm, overall height 3950mm, front tread 1914mm, rating of engine 228kW, rated engine speed 2200r/min, final ratio is 4.875, nine gear wheel boxes: a gear ratio of gear i
1=11.02, i
2=6.55, i
3=4.64, I
4=3.36, i
5=2.46, i
6=1.95, i
7=1.38, i
8=1.0, i
9=0.73, footmark is wheel box gear.
(1) with the coefficient of rolling resistance formula of class of vehicle statistics belonging to inspection vehicle and coefficient of air resistance formula, by the associated vehicle technical parameter logged in, calculate each speed of a motor vehicle point constant speed road examination running resistance of institute's inspection vehicle.
(2) the vehicle resistance formula of neutral position sliding measuring vehicle cylinder whole system and force snesor vibration force of each speed of a motor vehicle point on stand, the road examination resistance of the same speed of a motor vehicle deducts vehicle cylinder whole system resistance, obtain the device for power absorption loading force of each cruising mode, because the relative total load ratio of force snesor vibration force is comparatively large, device for power absorption loading force can superposition vibration force.
(3) 40km/h adopts eight gears, all the other speed of a motor vehicle employing nine gear, and constant force loads and measures fuel consumption per hundred kilometers is Q
40=22.14, Q
50=22.11, Q
60=24.79, Q
70=27.95, Q
80=31.7, footmark is the speed of a motor vehicle, comprehensive fuel consumption per hundred kilometers 29.3L/100km, and calculation engine corrected coefficient of power a=1.023, corrects comprehensive fuel consumption per hundred kilometers Q
school=29.3/1.023=28.64L/100km.
2, above-mentioned same vehicle is by the C-WTVC circulation transient condition Platform test of GB GB/T27840-2011.Wind cooling eddy current machine is arranged on front roll axle, and back roll is free cylinder, and vehicle is Two axle drive, and drive axle is heavily 36800N.
(1) after uppermost for universal characteristic curve of engine output net torque curve data, press Chinese invention patent application number: the computing method of 201410444250.4, the constant speed road examination running resistance of vehicle can be obtained, setpoint engine torque coefficient δ limit value is 1.05, the maximum engine torque load adopting computing method to obtain in circulation in 1800 seconds is 0.986 divided by the corresponding output torque of engine, judges that vehicle comprehensive dynamic is qualified and carries out Platform test.
(2) because back roll is free cylinder, only calculate the minimum adhesion weight G of drive axle, the angle of setting ψ of wheel on cylinder is 28.3 °, if a=0.8m/s
2, Φ=0.6, G=2 × a × M × cos ψ/Φ=2 × 0.8 × 24110 × 0.8805/0.6=56610N, should gain in weight and make drive axle heavily be more than or equal to 56610N.
(3) in conjunction with corresponding inertial flywheel, stand inertia is less than but closest to vehicle equivalence translation inertia, after vehicle weightening finish, neutral position sliding records the resistance formula of vehicle cylinder whole system and the force snesor vibration force of each speed of a motor vehicle, the road examination resistance of the same speed of a motor vehicle deducts vehicle cylinder whole system resistance, obtains the device for power absorption loading force of each cruising mode.
(4) accelerating mode device for power absorption loading force is calculated, on cruising mode's loading force, the difference of superposition vehicle equivalence translation inertia and stand equivalent inertia is multiplied by the inertia acceleration resistance of regulation acceleration, because force snesor vibration force is less relative to total load ratio, can afterburning sensor vibration power without end.Idling operation and decelerating mode device for power absorption do not load.
(5) calculation engine torque load also selects the higher gear continuing the stipulated time automatically, in good time prompting is put into gear and is operated, bench teat records urban district circulation oil consumption 49.99L/100km, highway circulation oil consumption 39.46L/100km, high-speed circulating oil consumption 34.1L/100km, can be calculated comprehensive fuel consumption per hundred kilometers 37.83L/100km.Calculation engine corrected coefficient of power a=1.026 can be increased, obtain correcting comprehensive fuel consumption per hundred kilometers Q
school=37.83/1.021=37.05L/100km.
The detection method of heavy goods vehicles bench teat Fuel Consumption or discharge, has the advantages such as detection is accurate, good operability, is applicable to the detection of the various performance of bench teat heavy goods vehicles energy-saving and emission-reduction.
Claims (1)
1. the detection method of heavy goods vehicles bench teat Fuel Consumption or discharge, being heavy goods vehicles detects a kind of method of Fuel Consumption or discharge at appear on the stage examination simulation road examination cruising mode or transient condition of chassis dynamometer, it is characterized in that: transient condition bench teat will after engine output torque curve data, judge that vehicle comprehensive dynamic is qualified by computing method and just carry out Platform test afterwards, on the chassis dynamometer with three axle cylinders, transient condition bench teat, for the lighter empty-car of non-passenger vehicle class driving shaft, for preventing wheel and cylinder from trackslipping, should make vehicle drive shaft weight be not less than minimum adhesion weight, first determine that vehicle rolling resistance formula and air resistance formula are to calculate each speed of a motor vehicle road examination resistance, then the vehicle resistance formula of neutral position sliding measuring vehicle cylinder whole system and force snesor vibration force of each speed of a motor vehicle on stand, the road examination resistance of the same speed of a motor vehicle deducts the device for power absorption loading force that vehicle cylinder whole system resistance is cruising mode, accelerating mode bench teat device for power absorption loading force is on the basis of cruising mode's loading force, the difference of superposition vehicle equivalence translation inertia and stand equivalent inertia is also wanted to be multiplied by the inertia acceleration resistance of regulation acceleration, can superposition or afterburning sensor vibration power without end, accelerating mode bench teat is by the vehicle associated technical parameters logged in, calculation engine torque load and rotating speed, meeting under engine output torque and rotary speed property, the higher gear continuing the stipulated time is selected to measure Fuel Consumption or toxic emission, during upshift, engine speed is greater than and equals its minimum stable engine speed, in good time prompting is put into gear and is operated, and can calculate correction fuel consumption Q
school=Q
inspection/ a, Q
inspectionfor detecting Fuel Consumption, a is engine capacity correction coefficient.
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| CN201510025470.8A CN104568467B (en) | 2015-01-07 | 2015-01-07 | Heavy ride examination Fuel Consumption or the detection method of discharge |
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| CN110967191A (en) * | 2019-11-26 | 2020-04-07 | 辽宁龙马安泰网络技术有限责任公司 | Method for detecting emission of exhaust gas generated during running of automobile |
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