CN103115651B - Method for detecting fuel consumption of vehicle in transient road-test standard state - Google Patents
Method for detecting fuel consumption of vehicle in transient road-test standard state Download PDFInfo
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Abstract
The invention discloses a method for detecting the fuel consumption of a vehicle in a transient road-test standard state. The method is characterized in that both a transient road-test load of the vehicle and a load of an engine are corrected so that the fuel consumption of the transient road-test load of the vehicle and the fuel consumption of the load of the engine can be detected and evaluated in a standard environmental state, the fuel consumption Delta Q within various time intervals Delta t are measured in a road test, idle-speed, acceleration, constant-speed and deceleration conditions are respectively corrected by the aid of a road-test load coefficient and an engine power correction coefficient to obtain the fuel consumption Delta Qb in various standard environmental states of the conditions, and the Delta Qb of a total time interval under each condition in a full detection procedure is accumulated to obtain the detected fuel consumption Qb0 of the vehicle in the transient road-test standard state. The method has the advantages of high accuracy, speediness, simplicity and the like.
Description
Technical field
The present invention relates to vehicle performance road examination detection method technical field, a kind of fuel consumption of vehicle in transient road-test standard state detection method specifically, that vehicle transient state road under the experimental enviroment condition of regulation is tried after idling operation, accelerating mode, cruising mode, decelerating mode detect Fuel Consumption, the Fuel Consumption surveyed under road examination ambient condition is corrected into a kind of detection method of Fuel Consumption under standard ambient condition, enables the Fuel Consumption of different automobile types compare and evaluate under unified normal condition condition.
Background technology
Existing vehicle on road examination fuel consumption quantity measuring method has two kinds, the first is JT711-2008 " operating passenger car Fuel Consumption limit value and measuring method " and JT719-2008 " operation truck fuel consumption limit value and measuring method ", belongs to the examination of constant speed road and detects Fuel Consumption; The second is that the transient state road examination of other correlation standard detects Fuel Consumption, and the examination of transient state road is made up of the accelerating mode of idling operation, regulation accekeration, the cruising mode of regulation speed of a motor vehicle point, decelerating mode four kinds examination load of not going the same way.Application for a patent for invention " vehicle constant speed road test standard state fuel consumption amount correction method " just solves the oil consumption Correction Problems of cruising mode, the Fuel Consumption how the detection Fuel Consumption under various for vehicle transient state work condition environment state all corrected under standard ambient condition, carrying out Fuel Consumption unitarity detecting and assessing, there is many defects and blank in prior art.
Summary of the invention
The object of the present invention is to provide a kind of fuel consumption of vehicle in transient road-test standard state detection method, accuracy is high, quick, simple, road is made to try the detection carried out of Fuel Consumption and compare to have unitarity and comparability, vehicle on road can be made to try better, more fully to reflect real driving cycle, by to different classes of vehicle test statistics, obtain different classes of vehicle typical transient state road examination condition model.
The present invention is achieved through the following technical solutions.
A kind of fuel consumption of vehicle in transient road-test standard state detection method, it is characterized in that: vehicle idling under transient state road examination ambient condition, accelerate, constant speed, the Fuel Consumption that four kinds of operating modes of slowing down detect is corrected into the method for standard ambient condition Fuel Consumption, vehicle transient state road examination load and engine load are all corrected under standard ambient condition, carries out Fuel Consumption detecting and assessing, the vehicle that the examination of its Road obtains each speed of a motor vehicle point travels drag overall RT, running resistance rectifying parameter K, the Fuel Consumption that road examination is measured in each time interval △ t is △ Q, calculate the specific fuel consumption δ of standard ambient condition engine unit power, in idling, constant speed, accelerate, four kinds of operating modes of slowing down correct the Fuel Consumption △ Qb obtained under each operating mode standard ambient condition respectively:
1) at idling operation, Fuel Consumption is △ Qb1, then △ Qb1=△ Q/a, a are engine capacity correction factor;
2) cruising mode, Fuel Consumption is △ Qb2, if corrected engine accessory power rating consumption of power, then δ=△ Q/［ a × (RT+ME) ］, △ Qb2=δ × (K × RT+ME), ME consumes equivalent power by the engine accessory power rating of engine speed estimation, if do not corrected engine accessory power rating consumption of power, then △ Qb2=△ Q × K/a;
3) at accelerating mode, Fuel Consumption is △ Qb3, average speed calculating K value temporally in interval △ t and engine speed, by actual acceleration or regulation acceleration, calculate vehicle inertia load of accelerating RG and δ, if corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG+ME)], △ Qb3=δ × (K × RT+RG+ME), if do not corrected engine accessory power rating consumption of power, then δ=△ Q/[a × (RT+RG)], △ Qb3=δ × (K × RT+RG);
4) at decelerating mode, Fuel Consumption is △ Qb4, then △ Qb4=△ Q/a;
The △ Qb detecting All Time interval in each operating mode of overall process is added up, namely obtains the detection Fuel Consumption Qb0 under vehicle transient state road examination standard ambient condition, i.e. Qb0=△ Qb1+ △ Qb2+ △ Qb3+ △ Qb4.
Transient state road examination as regulation does not have idling operation or decelerating mode, then the △ Q=0 of idling operation or decelerating mode, can not correct the oil consumption of idling operation or the very little ratio of decelerating mode as simplified yet.
Technological merit of the present invention is as follows:
(1) calculate for simplifying, △ t can be stipulated time or the real time of each operating mode, and the operating mode of different regulation accekeration also can be independent accelerating mode, only once need correct the Fuel Consumption of each operating mode.
(2) the identical gear of same vehicle, the speed of a motor vehicle, the equivalent power ME consumed with the engine accessory power rating under standard ambient condition under road examination ambient condition is substantially identical, and inertia load of accelerating RG is also substantially identical.Can by a transmission ratio of putting into gear, final ratio, the speed of a motor vehicle, tire radius carry out calculation engine rotating speed and estimate the weight coefficient of accessory horsepower and rating of engine.
(3) factor of inertia Kg can determine in 1.0 ~ 1.4 scopes, and namely the equivalent inertia of vehicle revolving part (containing engine rotation part) can be determined in 0 ~ 40% scope of vehicle mass m, and gear is lower, and number percent is higher; Passenger car number percent is higher, and lorry number percent is on the low side; Charging capacity is larger, and number percent is on the low side.When a test run neutral position sliding in road measures road examination resistance RT, owing to not having the reasons such as engine rotation part equivalent inertia, Kg comparatively I determines in 1.0 ~ 1.05 scopes, and as ignored vehicle revolving part equivalent inertia, then getting Kg is 1.0.
(4) at same speed of a motor vehicle point, travel the specific fuel consumption δ approximately equal of the engine unit power under the standard ambient condition of load before and after setting corrects, substantially conform to actual conditions.
From above-mentioned, the present invention corrects vehicle on road examination load and engine power under standard ambient condition, namely be the Fuel Consumption Fuel Consumption that vehicle transient state road examination idling, acceleration, constant speed, deceleration four kinds of operating modes are surveyed is converted under standard ambient condition, under unified base condition, accurate detecting and assessing, has the advantages such as accuracy is high, quick, simple.The present invention satisfies the need the examination detection carried out of Fuel Consumption and compare and have unitarity and comparability, vehicle on road is made to try better, more fully to reflect real driving cycle, by adding up different classes of vehicle test, obtain different classes of vehicle typical transient state road examination condition model, as urban bus four operating mode, commercial car six operating mode, passenger car 15 operating mode, be namely made up of idling, acceleration, constant speed, deceleration four kinds of different operating modes respectively.
Embodiment
Fuel consumption of vehicle in transient road-test standard state detection method of the present invention, a kind of vehicle idling under transient state road examination ambient condition, accelerate, constant speed, the Fuel Consumption that four kinds of operating modes of slowing down detect is corrected into the method for standard ambient condition Fuel Consumption, vehicle transient state road examination load and engine load are all corrected under standard ambient condition, carries out Fuel Consumption detecting and assessing, the vehicle that the examination of its Road obtains each speed of a motor vehicle point travels drag overall RT, running resistance rectifying parameter K, the Fuel Consumption that road examination is measured in each time interval △ t is △ Q, calculate the specific fuel consumption δ of standard ambient condition engine unit power, in idling, constant speed, accelerate, four kinds of operating modes of slowing down correct the Fuel Consumption △ Qb obtained under each operating mode standard ambient condition respectively:
1) at idling operation, Fuel Consumption is △ Qb1, then △ Qb1=△ Q/a, a are engine capacity correction factor;
2) cruising mode, Fuel Consumption is △ Qb2, if corrected engine accessory power rating consumption of power, then δ=△ Q/［ a × (RT+ME) ］, △ Qb2=δ × (K × RT+ME), ME consumes equivalent power by the engine accessory power rating of engine speed estimation, if do not corrected engine accessory power rating consumption of power, then △ Qb2=△ Q × K/a;
3) at accelerating mode, Fuel Consumption is △ Qb3, average speed calculating K value temporally in interval △ t and engine speed, by actual acceleration or regulation acceleration, calculate vehicle inertia load of accelerating RG and δ, if corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG+ME)], △ Qb3=δ × (K × RT+RG+ME), if do not corrected engine accessory power rating consumption of power, then δ=△ Q/[a × (RT+RG)], △ Qb3=δ × (K × RT+RG);
4) at decelerating mode, Fuel Consumption is △ Qb4, then △ Qb4=△ Q/a;
The △ Qb detecting All Time interval in each operating mode of overall process is added up, namely obtains the detection Fuel Consumption Qb0 under vehicle transient state road examination standard ambient condition, i.e. Qb0=△ Qb1+ △ Qb2+ △ Qb3+ △ Qb4.
Transient state road examination as regulation does not have idling operation or decelerating mode, then the △ Q=0 of idling operation or decelerating mode, can not correct the oil consumption of idling operation or the very little ratio of decelerating mode as simplified yet.
More specifically be described below:
By GB18352.3-2005 " light-duty vehicle pollutant emission limit and measuring method (III, IV stage of China) " regulation, the automobile running resistance FT that detected state road measures or power P T should be corrected to running resistance FTb=K × FT under standard state or power P Tb=K × PT.
Correction coefficient is K=RR × [1+KR × (t-tb)]/RT+Ra × ρ b/(ρ t × RT).
In formula: the resistance to rolling measured during RR-vehicle velocity V;
The air resistance measured during Ra-vehicle velocity V;
The running car drag overall of test determination during RT-vehicle velocity V, RT=RR+Ra;
The temperature correction facotor of KR-resistance to rolling, gets 8.64 × 10
-3/
0c;
Atmospheric temperature during t-actual road test,
0c;
Tb-standard state atmospheric temperature,
0c;
Atmospheric density under ρ t-experimental enviroment condition;
Atmospheric density under ρ b-standard state;
T and ρ t under road examination environmental baseline measures given value, but the ratio RR/RT of resistance to rolling RR and drag overall RT and air resistance Ra is the function of the speed of a motor vehicle with the ratio Ra/RT of drag overall RT, and during constant speed, K is constant, and during speed change, K is variable.Engine accessory power rating consumption of power is the function of engine speed, accelerating mode or cruising mode, can correct engine accessory power rating consumption of power or not correct, also can not correct the oil consumption of idling operation or the very little ratio of decelerating mode as simplified.Divide four kinds of operating modes to correct detection Fuel Consumption respectively, its concrete steps are as follows:
1, road examination obtains RT and K
The RT of each speed of a motor vehicle point under obtaining testing environment state by road examination, obtains road examination running resistance formula with the quadratic power of the speed of a motor vehicle: RT=a+b × V+c × V
2, V is the speed of a motor vehicle, unit km/h, if the speed of a motor vehicle point that transient condition specifies is few, directly can measure the road examination running resistance RT of each speed of a motor vehicle point, without the need to obtaining the recurrence road examination running resistance formula of speed of a motor vehicle quadratic term.The wheels travel coefficient of rolling resistance f formula obtained by different vehicle or tyre type test statistics, f is also the function of the speed of a motor vehicle, can be calculated each speed of a motor vehicle point RR=f × m × g, m are vehicle mass, units/kg, g is acceleration of gravity, can get 9.81m/s
2thus RR/RT and Ra/RT=1-RR/RT of each speed of a motor vehicle point can be obtained, ρ t and t under road examination testing environment state is definite value, thus the K value of each speed of a motor vehicle point of vehicle can be calculated, traveling load Rb1=K × RT under standard ambient condition, Rb1=FTb, if road examination ambient condition in time interval △ t to survey Fuel Consumption be △ Q, Fuel Consumption under standard ambient condition is △ Qb, the specific fuel consumption of the engine unit power under standard ambient condition is δ, if Rb1, RT of the same speed of a motor vehicle two point load δ approximately equal.
2, the Fuel Consumption of idling operation corrects
The vehicle of idling operation is that neutral put by variator, clutch coupling combines, or variator hangs up gear, throw-out-of clutch, there is not running resistance in vehicle, without the need to correcting running resistance, but consider that the standard ambient condition Fuel Consumption of engine idling condition power corrects, be located at the engine power Mg of testing environment state idling operation, Mg corrects the engine power Mgb=a × Mg under standard ambient condition, a is engine capacity correction factor, for measuring given value under road examination testing environment state, δ=△ Q/ (a × Mg), △ Qb1=Mg × δ=Mg × △ Q/ (a × Mg)=△ Q/a.In whole idling operation, can in each time interval △ t survey after Fuel Consumption △ Q revises and add up again, or correct again after whole detection Fuel Consumptions of this operating mode cumulative, obtain the road test-object quasi state fuel consumption of this idling operation.
3, the Fuel Consumption of cruising mode corrects
As corrected engine accessory power rating consumption of power, by application for a patent for invention " vehicle constant speed road test standard state fuel consumption amount correction method ", with the weight coefficient of engine speed or automobile speedestimate accessory horsepower and rated power, calculation engine annex consumes equivalent power ME, δ=△ Q/［ a × (RT+ME) ］, △ Qb=δ × (K × RT+ME).Do not correct engine accessory power rating consumption of power if simplified, then △ Qb2=△ Q × K/a, adds up after correction again, or corrects after whole detection Fuel Consumptions of this operating mode cumulative again, obtains the road test-object quasi state fuel consumption of this cruising mode.
4, the Fuel Consumption of accelerating mode corrects
At each time interval △ t=t2-t1 to V2 and V1 should be had, calculate the average K value in this time interval by flat=0.5 × (V2+V1) of average speed V.Actual acceleration A=(V2-V1)/[3.6 × (t2-t1)], unit m/s
2also A can be replaced to calculate with regulation acceleration, obtaining inertia load of accelerating RG=Kg × m × A, Kg is factor of inertia, can determine by type of vehicle, loading condition and gear between 1.0 ~ 1.4, obtain the road examination load Rb1=K × RT under this average speed point standard ambient condition.If corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG+ME)], △ Qb3=δ × (Rb1+RG+ME)=δ × (K × RT+RG+ME); If do not corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG)], △ Qb3=δ × (K × RT+RG), adds up after correction again, obtains the road test-object quasi state fuel consumption of this accelerating mode.Difference can be specified the moment that the intermediate time of gearshift in 2 seconds in the continuous accelerating mode of accekeration changes as operating mode.
5, the Fuel Consumption of decelerating mode corrects
Decelerating mode is full accelerator releasing usually, it is little that load relation is tried on the power of engine and road, different road examination loads mainly makes the retarded velocity of vehicle different, and the decelerating mode time is shorter, when retarded velocity is less than setting, need brake slightly, so, testing environment state can be ignored and to satisfy the need the impact of examination load, only consider that the standard ambient condition of engine power corrects, correct roughly the same with the Fuel Consumption of idling operation, △ Qb4=△ Q/a.
Fuel consumption of vehicle in transient road-test standard state detection method of the present invention, by GB18352.3-2005 " light-duty vehicle pollutant emission limit and measuring method ", illustrates its embodiment for passenger car transient state urban district cycling element:
1, quality m is slided by the passenger car of regulation, kg, the speed of a motor vehicle can be made more than neutral position sliding after 110km/h, measure 20 ± 5km/h, the coasting time of 60 ± 5km/h, 100 ± 5km/h tri-vehicle speed intervals, obtains the retarded velocity of 20km/h, 60km/h, 100km/h tri-speed of a motor vehicle points, then can obtain the road examination running resistance of three speed of a motor vehicle points, obtain the recurrence road examination running resistance formula of speed of a motor vehicle quadratic term: RT=a+b × V+c × V
2.If the speed of a motor vehicle point that transient condition specifies is few, directly can measures the road examination running resistance RT of each speed of a motor vehicle point, simplifying without the need to obtaining
The recurrence road examination running resistance formula of speed of a motor vehicle quadratic term.
By the experimental formula of test statistics, the rolling resistance of wheel coefficient f of passenger car is the function of the speed of a motor vehicle, rolling resistance of wheel RR=m × g × f, RR/RT, Ra/RT=1-RR/RT of each speed of a motor vehicle point and the K of each speed of a motor vehicle point can be obtained, engine capacity correction factor a can be obtained according to the road examination temperature of ambient condition, air pressure, humidity.
2, passenger car is by cycle detection transient state road, the urban district examination Fuel Consumption of specification, if sample time, interval was 1s, enter idling operation at 0s to 11s, the measurement Fuel Consumption in 1s is △ Q, then △ Qb1=△ Q/a.
3, enter accelerating mode at 11s to 15s, it is I gear that regulation is put into gear, and acceleration is 1.04 m/s
2, calculate acceleration A=(V2-V1)/3.6, m/s in each second
2, or A gets regulation acceleration 1.04 m/s
2, calculate the K value of flat=0.5 × (V2+V1) of average speed point V, calculate Rb1=K × RT, passenger car can set gear box I to keep off Kg as 1.4, II gear Kg is 1.14, III gear K is 1.08, IV gear Kg is 1.06, RG=1.4 × m × A can be obtained, if corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG+ME)], △ Qb=δ × (K × RT+RG+ME), if do not corrected engine accessory power rating consumption of power, then δ=△ Q/[a × (RT+RG)], △ Qb2=δ × (K × RT+RG), ME is identical with cruising mode below for the estimation of accelerating mode average speed point.
4, cruising mode is entered at 15s to 23s, it is I gear that regulation is put into gear, constant speed is 15km/h, calculate engine speed n=15 corresponding to this speed of a motor vehicle × (i1 × i0)/(0.377 × R), i1 is I gear ratio of gear, i0 is final ratio, R is that wheel calculates rolling radius, unit m, the weight coefficient of accessory horsepower and rated power can be established to be the one or many function of engine speed, usually can set rated speed is 0.1, idling is 0.03, calculation engine annex consumes equivalent power ME, calculate this regulation speed of a motor vehicle point K value and as definite value, measure the Fuel Consumption △ Q in 1s, δ=△ Q/［ a × (RT+ME) ］, △ Qb3=δ × (K × RT+ME).ME is not corrected as simplified, then △ Qb3=△ Q × K/a.
5, decelerating mode is entered at 23s to 28s, △ Qb4=△ Q/a.The detection method of other idling that standard specifies, acceleration, constant speed, decelerating mode is in like manner analogized.
6, the △ Qb in All Time interval in each for testing process operating mode is added up, namely obtain the detection Fuel Consumption Qb0 of vehicle transient state road examination standard state.As simplified calculating, can detect sample time is that 1s is constant, setting △ t is respectively stipulated time or the real time of whole operating mode, if idling operation is 0s to 11s, accelerating mode is 11s to 15s, and cruising mode is 15s to 23s, and decelerating mode is 23s to 28s, the cumulative road examination obtained in each operating mode detects Fuel Consumption △ Q, and each operating mode only once need calculate the △ Qb correcting and obtain this operating mode.
Claims (2)
1. fuel consumption of vehicle in transient road-test standard state detection method, it is characterized in that: vehicle idling under transient state road examination ambient condition, accelerate, constant speed, the Fuel Consumption that four kinds of operating modes of slowing down detect is corrected into the method for standard ambient condition Fuel Consumption, vehicle transient state road examination load and engine load are all corrected under standard ambient condition, carries out Fuel Consumption detecting and assessing, the vehicle that the examination of its Road obtains each speed of a motor vehicle point travels drag overall RT, running resistance rectifying parameter K, the Fuel Consumption that road examination is measured in each time interval △ t is △ Q, calculate the specific fuel consumption δ of standard ambient condition engine unit power, in idling, constant speed, accelerate, four kinds of operating modes of slowing down correct the Fuel Consumption △ Qb obtained under each operating mode standard ambient condition respectively:
1) at idling operation, Fuel Consumption is △ Qb1, then △ Qb1=△ Q/a, a are engine capacity correction factor;
2) cruising mode, Fuel Consumption is △ Qb2, if corrected engine accessory power rating consumption of power, then δ=△ Q/［ a × (RT+ME) ］, △ Qb2=δ × (K × RT+ME), ME consumes equivalent power by the engine accessory power rating of engine speed estimation, if do not corrected engine accessory power rating consumption of power, then △ Qb2=△ Q × K/a;
3) at accelerating mode, Fuel Consumption is △ Qb3, average speed calculating K value temporally in interval △ t and engine speed, by actual acceleration or regulation acceleration, calculate vehicle inertia load of accelerating RG and δ, if corrected engine accessory power rating consumption of power, δ=△ Q/[a × (RT+RG+ME)], △ Qb3=δ × (K × RT+RG+ME), if do not corrected engine accessory power rating consumption of power, then δ=△ Q/[a × (RT+RG)], △ Qb3=δ × (K × RT+RG);
4) at decelerating mode, Fuel Consumption is △ Qb4, then △ Qb4=△ Q/a;
The △ Qb detecting All Time interval in each operating mode of overall process is added up, namely obtains the detection Fuel Consumption Qb0 under vehicle transient state road examination standard ambient condition, i.e. Qb0=△ Qb1+ △ Qb2+ △ Qb3+ △ Qb4.
2. fuel consumption of vehicle in transient road-test standard state detection method according to claim 1, it is characterized in that: the transient state road examination as regulation does not have idling operation or decelerating mode, the then △ Q=0 of idling operation or decelerating mode, also can not correct the oil consumption of idling operation or the very little ratio of decelerating mode as simplified.
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