CN105468930B - A kind of forklift engine Calculation Method of Nominal Power based on dynamic factor equation group - Google Patents
A kind of forklift engine Calculation Method of Nominal Power based on dynamic factor equation group Download PDFInfo
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- CN105468930B CN105468930B CN201511031537.5A CN201511031537A CN105468930B CN 105468930 B CN105468930 B CN 105468930B CN 201511031537 A CN201511031537 A CN 201511031537A CN 105468930 B CN105468930 B CN 105468930B
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Abstract
The present invention provides a kind of forklift engine Calculation Method of Nominal Power based on dynamic factor equation group, includes the following steps：The fully loaded max. speed V when driving of fork truck is calculated separately with full engine load driving cyclemax, fork truck empty-weight G and raising tonnage Q；Dynamic factor D is calculated using dynamic factor equation groupmax；The max. speed V that will be obtainedmax, fork truck empty-weight G, raising tonnage Q and DmaxEmpirical equation is substituted into, forklift engine rated power N is calculatede.The method that the present invention uses piecewise linearity, comparison of computational results is accurate, only it is to be understood that the tonnage of calculative fork truck, it will be able to quickly obtain dynamic factor D using dynamic factor equation groupmax, and then the rated power of engine is obtained, remove anticipation from, consult the final process for determining efficient cause numerical value, greatly improves work efficiency.
Description
Technical field
The present invention relates to technical field of engines, and in particular to a kind of forklift engine volume based on dynamic factor equation group
Determine power calculation algorithms.
Background technology
The rated power of forklift engine refers to that forklift engine is consumed in itself and its attachment (fan, water pump, generator
Deng) after required power, with the effective firm power of the maximum that can be used for operation and traveling of bent axle output.
When being designed into fork, the power calculation of accurate engine is a complicated problem, to consider fork truck
Applying working condition.For accurately calculating engine power, there are two types of thinking and viewpoints in the world at present：A kind of viewpoint is by the U.S., day
This proposes and develops earliest, with Japanese Japan's handling machinery Co., Ltd (TCM) for main representative, it is believed that the engine work(of fork truck
The calculating of rate is calculated according to the operating mode for being fully loaded with raising when operation to load and unload as starting point, considers certain margin of power,
After coefficient for many years is corrected, following formula is obtained：
The viewpoint that another kind is proposed and developed by Europe, the former Soviet Union, it is believed that fork truck is a kind of handling machinery for handling,
In whole activity durations of fork truck, traveling accounts for about 2/3, and starting parking is frequent, it is necessary to consider Acceleration of starting ability, engine work(
Rate is pressed fully loaded driving cycle and is calculated.After the consume of various auxiliary oil pumps and all kinds of devices, by years development, obtain with
Lower formula：
Although the shortcomings that both viewpoints and computational methods are for engine power starting point is different, by sending out for many years
Zhan Hou, the result of calculation that the two is used for obtained by middle or small tonnage fork car is unexpectedly very close, and industry is it is believed that formula (1) at present
Computational methods it is very fast and convenient quick, but in the case where considering comprehensive operating mode, the result of calculation that formula (2) obtains more can
It matches with actual conditions.However second method is there are one crucial parameter, is exactly dynamic factor Dmax, dynamic factor is just
It is the tractive force of fork truck per unit weight, needs to calculate using following formula：
But it is relatively difficult using accurately calculating for above-mentioned formula dynamic factor, can not the fork truck that calculates of efficient quick start
The rated power of machine.
Invention content
The present invention provides a kind of computational methods of forklift engine rated power, reaches accurate with dynamic factor equation group
The purpose of calculating.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of forklift engine Calculation Method of Nominal Power based on dynamic factor equation group, includes the following steps：
1) the fully loaded max. speed V when driving of fork truck is calculated separately with full engine load driving cyclemax, fork truck zero load weight
Measure G and raising tonnage Q；
2) dynamic factor is calculated by equation group：
In conjunction with dynamic factor curve, dynamic factor and the relationship of raising tonnage are subjected to piece-wise linearization；
According to fork lift truck structure, bed load function and homework type operating mode, raising tonnage Q is divided into [q1,3)、[3,5)、[5,
10), [10,25) and [25, q2] five grades, wherein q1For minimum raising tonnage, q2For maximum raising tonnage, calculate separately each
The linear equations of grade obtain dynamic factor equation group Dmax, formula is as follows：
3) the max. speed V obtained by step 1) and 2)max, fork truck empty-weight G, raising tonnage Q and DmaxIt substitutes into as follows
Empirical equation, calculate forklift engine rated power Ne：
Wherein α is engine flexibility coefficient, and β is non-firm power coefficient, ηmIt runs at high speed drive line efficiency for fork truck, ηn
For engine accessory power rating power consumption coefficient.
Preferably, the q1It is 0.5 ton.
Preferably, the q2It is 60 tons.
By above technical scheme it is found that the present invention has the advantages that：
Dynamic factor equation group completely sets up dynamic factor DmaxWith the relational expression between forklift lifting tonnage, and
Using the method for piecewise linearity, comparison of computational results is accurate, only it is to be understood that the tonnage of calculative fork truck, it will be able to utilize dynamic
Force factor equation group quickly obtains dynamic factor Dmax, and then obtain the rated power of engine, remove from anticipation, consult it is final true
The process of determined power factor value, greatly improves work efficiency.
Description of the drawings
Fig. 1 is the graph of relation of dynamic factor and raising tonnage in the prior art；
Fig. 2 is the piecewise linearity figure of dynamic factor and raising tonnage relationship in the present invention.
Specific implementation mode
A kind of preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
By a large amount of statistics to industry, the graph of relation of dynamic factor and raising tonnage is obtained, as shown in Figure 1.It presses
Curve like this can estimate out the maximum power factor of fork truck top gear, therefore when the prior art is into fork power calculation,
Maximum power factor, such as raising tonnage Q are selected in 2 ton hours, D first, in accordance with curvemaxIt is approximately equal to 0.09, DmaxAs tonnage subtracts
It is small and increase, such as lifting capacity Q is in 5 ton hours, DmaxIt is approximately equal to 0.05.
The present invention is analyzed and researched by the test data to a large amount of fork trucks, finds fork truck dynamic factor and raising tonnage
Relationship have the functional relation of linearisation in local tonnage section, in conjunction with dynamic factor curve, to dynamic factor and raising ton
The relationship of position carries out piece-wise linearization, and slope coefficient k and the intercept system of each linear equation are exported according to the functional relation of linearisation
Number b obtains dynamic factor equation group in conjunction with tonnage feature.
With reference to Fig. 2, dynamic factor and the relationship of raising tonnage are subjected to piece-wise linearization：
According to fork lift truck structure, bed load function and homework type operating mode, raising tonnage Q is divided into multiple grades, by looking into
Table calculates separately the linear equations of each grade.
One, raising tonnage section 0-2
Since the tonnage of fork truck cannot be zero, the dynamic factor of minimum 0.5 ton of fork truck is about at 0.12 or so, 2 ton
Shi Yuewei 0.09.If linear rule is：Y=k1x+b1, obtain：
0.5k1+b1=0.12
2k1+b1=0.09
Two formula of simultaneous, solves k1=-0.02, b1=0.13；
Show that 0-2 tons of local linear equations are：y1=-0.02x+0.13x ∈ [0.5,2) (1)
Two, raising tonnage section 2-3
The dynamic factor for the fork truck that raising tonnage is 2 tons is about about 0.07 in 0.09 or so, 3 ton hour.If linear rule
For：Y=k2x+b2, obtain：
2k2+b2=0.09
3k2+b2=0.07
Two formula of simultaneous, solves k2=-0.02, b2=0.13；
Show that 2-3 tons of local linear equations are：y2=-0.02x+0.13x ∈ [2,3) (2)
By formula (1) and formula (2) it can be found that 0.5-2 tons identical as both 2-3 tons of linear rule, can merge.
Three, raising tonnage section 3-5
The dynamic factor for the fork truck that raising tonnage is 3 tons is about about 0.05 in 0.07 or so, 5 ton hour.If linear rule
For：Y=k3x+b3, obtain：
3k3+b3=0.07
5k3+b3=0.05
Two formula of simultaneous, solves k3=-0.01, b3=0.1；
Show that 2-3 tons of local linear equations are：y3=-0.01x+0.1x ∈ [3,5) (3)
Four, raising tonnage section 5-10
The dynamic factor for the fork truck that raising tonnage is 5 tons is about about 0.03 in 0.05 or so, 10 ton hour.If linear rule
For：Y=k4x+b4, obtain：
5k4+b4=0.05
10k4+b4=0.03
Two formula of simultaneous, solves k4=-0.004, b4=0.07；
Show that 2-3 tons of local linear equations are：y4=-0.004x+0.07x ∈ [5,10) (4)
Five, raising tonnage section 10-25
The dynamic factor for the fork truck that raising tonnage is 10 tons is about about 0.02 in 0.03 or so, 25 ton hour.If linear gauge
Rule is：Y=k5x+b5, obtain：
10k5+b5=0.03
25k5+b5=0.02
Two formula of simultaneous, solves k5=-0.00067, b5=0.0367；
Show that 2-3 tons of local linear equations are：y4=-0.00067x+0.0367 x ∈ [10,25) (5)
Six, 25 tons of tonnage section or more
Dynamic factor and the relationship of raising tonnage tend to be horizontal at this time, it is believed that 25 tons or more fork truck Dmax=0.02
In summary formula (3), formula (4), formula (5), combination type (1) and formula (2), obtain dynamic factor equation group, formula is such as
Under：
It is using the method that dynamic factor equation group calculates engine power：
Step 1：The fully loaded max. speed V when driving of fork truck is calculated separately with full engine load driving cyclemax, fork truck it is empty
Loading capacity G and raising tonnage Q；
Step 2：Dynamic factor D is calculated using the equation group of formula (6)max；
Step 3：The max. speed V that step 1 and step 2 are obtainedmax, fork truck empty-weight G, raising tonnage Q and Dmax
Following empirical equation is substituted into, forklift engine rated power N is calculatede：
Wherein α is engine flexibility coefficient, and β is non-firm power coefficient, ηmIt runs at high speed drive line efficiency for fork truck, ηn
For engine accessory power rating power consumption coefficient.
This dynamic factor equation group can be incorporated into software by the present invention, at once can be certainly as long as input relevant parameter
It is dynamic to calculate engine power using this equation group, further improve efficiency.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of forklift engine Calculation Method of Nominal Power based on dynamic factor equation group, which is characterized in that including as follows
Step：
1) the fully loaded max. speed V when driving of fork truck is calculated separately with full engine load driving cyclemax, fork truck empty-weight G and
Raising tonnage Q；
2) dynamic factor is calculated by equation group：
In conjunction with dynamic factor curve, dynamic factor and the relationship of raising tonnage are subjected to piece-wise linearization；
According to fork lift truck structure, bed load function and homework type operating mode, raising tonnage Q is divided into [q1,3)、[3,5)、[5,10)、
[10,25) and [25, q2] five grades, wherein q1For minimum raising tonnage, q2For maximum raising tonnage, each grade is calculated separately
Linear equations, obtain dynamic factor equation group Dmax, formula is as follows：
3) the max. speed V obtained by step 1) and 2)max, fork truck empty-weight G, raising tonnage Q and DmaxSubstitute into following warp
Formula is tested, forklift engine rated power N is calculatede：
Wherein α is engine flexibility coefficient, and β is non-firm power coefficient, ηmIt runs at high speed drive line efficiency for fork truck, ηnFor hair
Motivation accessory power expends coefficient.
2. forklift engine Calculation Method of Nominal Power according to claim 1, which is characterized in that the q1It is 0.5 ton.
3. forklift engine Calculation Method of Nominal Power according to claim 1, which is characterized in that the q2It is 60 tons.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1920987A3 (en) * | 2006-11-09 | 2009-12-02 | Mitsubishi Heavy Industries, Ltd. | Industrial vehicle and power control method for the same |
| CN101650240A (en) * | 2009-09-30 | 2010-02-17 | 湖南山河智能机械股份有限公司 | Detecting and analyzing apparatus for power efficiency of electric fork truck |
| CN104925701A (en) * | 2015-06-19 | 2015-09-23 | 合肥工业大学 | Forklift transverse stability control method and electronic control system thereof |
-
2015
- 2015-12-30 CN CN201511031537.5A patent/CN105468930B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1920987A3 (en) * | 2006-11-09 | 2009-12-02 | Mitsubishi Heavy Industries, Ltd. | Industrial vehicle and power control method for the same |
| CN101650240A (en) * | 2009-09-30 | 2010-02-17 | 湖南山河智能机械股份有限公司 | Detecting and analyzing apparatus for power efficiency of electric fork truck |
| CN104925701A (en) * | 2015-06-19 | 2015-09-23 | 合肥工业大学 | Forklift transverse stability control method and electronic control system thereof |
Non-Patent Citations (2)
| Title |
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| 叉车发动机功率与传动方案及速比之间的相互影响;师玮等;《起重运输机械》;20150806;第6卷;第59-61页 * |
| 汽车动力性计算方法与特性图形绘制的应用;包凡彪等;《工程与试验》;20110930;第51卷(第3期);第16-19页 * |
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Address after: Jianghuai Heavy Industry Base, No. 2, Shanghai Road, Baohe Industrial Zone, Hefei City, Anhui Province, 230051 Patentee after: Anhui Jianghuai Heavy Construction Machinery Co.,Ltd. Address before: Jianghuai Heavy Industry Base, No. 2, Shanghai Road, Baohe Industrial Zone, Hefei City, Anhui Province, 230051 Patentee before: JAC HEAVY-DUTY CONSTRUCTION MACHINE Co.,Ltd. |
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