CN113895445B - Parasitic power classification and unnecessary parasitic power calculation method for vehicle - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
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Abstract
The invention discloses a method for classifying parasitic power and calculating unnecessary parasitic power of a vehicle, which is used for researching the parasitic power by analyzing the reasons of slip and slippage when the vehicle runs, classifying the parasitic power into necessary and unnecessary and calculating the unnecessary parasitic power which can be avoided. Typically, a dual-or multi-axle drive vehicle produces unnecessary parasitic work, causing vehicle power loss and unnecessary wear of tires, and therefore it is significant to analyze and calculate this portion of the unnecessary parasitic work.
Description
Technical Field
The invention relates to the field of vehicle energy efficiency research, in particular to a classification and calculation method of parasitic work generated by vehicle slip or slippage.
Background
In the running process of the vehicle, the wheels inevitably generate slip and slide, so that power loss is caused, and the work of the vehicle due to the slip or slide in the running process of the vehicle is called parasitic work in the industry. While the front and rear wheels inevitably generate slip and slip when the vehicle runs, parasitic work is unavoidable. Double and multiple axle drive vehicles, as well as articulated vehicles, due to their structural particulars, lose more power than single axle drive vehicles due to the greater factors that cause slip and skid.
However, for parasitic power and the reason for parasitic power generation (i.e., the reason for slip and slip generation), no known research results are known in the art, and no accurate and feasible way is available to directly determine the magnitude of the parasitic power, and the method can be used in practical engineering cases, and is limited to preliminary calculation and reasoning of the parasitic power. In the prior art, the parasitic power is generally represented by constructing a nonlinear high-order equation, the value of the parasitic power cannot be obtained through direct calculation, and no corresponding experiment is available at present to verify the correctness and feasibility of the scheme.
Disclosure of Invention
In this regard, the invention provides a new analysis of parasitic power based on the deficiency of the prior art, and provides a method for classifying the parasitic power of the vehicle and calculating unnecessary parasitic power. By analyzing the cause of slip and slip when the vehicle is running, the parasitic work is classified into necessary parasitic work and unnecessary parasitic work, and the unnecessary parasitic work is calculated. By analysis and calculation of unnecessary parasitic work, the power loss of the vehicle and the driving influence on the vehicle can be known.
The invention provides a classification method of vehicle parasitic power, which is characterized in that the parasitic power generated by slip and slippage is divided into necessary parasitic power and unnecessary parasitic power according to the reason of the slip or slippage of wheels, the parasitic power generated by the slip and slippage of the vehicle caused by normal driving of the wheels to rotate is the necessary parasitic power, and the parasitic power generated by the slip or slippage of the wheels caused by the same angular velocity of the wheels is the unnecessary parasitic power when the wheels are driven above double bridges.
The unnecessary parasitic work is generated when the power radiuses of the wheels on different axles are different and/or the steering radiuses are different when the vehicle is driven above the double axle.
The invention also provides a calculation method of unnecessary parasitic power of the vehicle, and for the double-axle and above driving vehicles, the unnecessary parasitic power of the wheels comprises two aspects, the sizes of which are respectively as follows:
W＝2π·f x |r 1 -r 2 sum of I
Wherein,
f x ＝min(f 1 ,f 2 )
f 1 : sliding friction of front wheel
f 2 : rear wheel sliding friction
r 1 : radius of front wheel power
r 2 : radius of rear wheel power
R 1 : steering radius of front axle
R 2 : steering radius of rear axle
R x 、r x And f x Correspondingly, if f x ＝f 1 R is then x ＝R 2 、r x ＝r 2 The method comprises the steps of carrying out a first treatment on the surface of the If f x ＝f 2 R is then x ＝R 1 、r x ＝r 1 。
For articulated vehicles, let L 1 : the distance from the front axle to the hinge point, L 2 : rear axle to hinge point distance, then:
(1) When r is 1 ＝r 2 ，L 1 ＝L 2 When the unnecessary parasitic power is 0;
(2) When r is 1 ＝r 2 ，L 1 ≠L 2 In the time-course of which the first and second contact surfaces,
1) If R is 1 ＝R 2 =0, unnecessary parasitic work is 0;
2) If R is 1 ≠R 2 Unnecessary parasitic work is:
(3) When r is 1 ≠r 2 ，L 1 ＝L 2 When unnecessary parasitic work is:
W＝2π·f x |r 1 -r 2 |
(4) When r is 1 ≠r 2 ，L 1 ≠L 2 In the time-course of which the first and second contact surfaces,
1) If R is 1 ＝R 2 =0, unnecessary parasitic work is: w=f x ·2π·|r 1 -r 2 |
2) If R is 1 ≠R 2 Unnecessary parasitic work is: W+W'.
Further, in actual engineering, the following is directly calculated:
a)f 1 >f 2 and R is 1 >R 2 And r is 1 >r 2 When unnecessary parasitic work is:
b)f 1 >f 2 and R is 1 >R 2 And r is 1 <r 2 When unnecessary parasitic work is:
c)f 1 >f 2 and R is 1 <R 2 And r is 1 >r 2 When unnecessary parasitic work is:
d)f 1 >f 2 and R is 1 <R 2 And r is 1 <r 2 When unnecessary parasitic work is:
e)f 1 <f 2 and R is 1 >R 2 And r is 1 >r 2 When unnecessary parasitic work is:
f)f 1 <f 2 and R is 1 >R 2 And r is 1 <r 2 When unnecessary parasitic work is:
g)f 1 <f 2 and R is 1 <R 2 And r is 1 >r 2 When unnecessary parasitic work is:
h)f 1 <f 2 and R is 1 <R 2 And r is 1 <r 2 When unnecessary parasitic work is:
wherein: l=2pi|r 1 -R 2 |、d＝2π·|r 1 -r 2 |。
The invention starts from the generation reasons of wheel slip and slip, firstly divides the parasitic work into necessary parasitic work and unnecessary parasitic work, gives out brand new explanation of the parasitic work, indicates that the necessary parasitic work is unavoidable in the running process of the vehicle, and the unnecessary parasitic work can cause power loss of the vehicle, unnecessary abrasion of tires and energy waste. Furthermore, in order to clarify the influence of the part of work on the running of the vehicle, the invention also provides a calculation method of unnecessary parasitic work so as to know the influence of the parasitic work on the vehicle and improve the driving force and the fuel efficiency of the whole vehicle.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 shows the front wheel slip ratio delta 1 And rear wheel slip ratio delta 2 A relationship diagram;
FIG. 2 is a schematic illustration of articulated vehicle motion.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples, which form a part hereof, and which together with examples serve to illustrate the invention. It will be appreciated by those skilled in the art that the following examples are not intended to limit the scope of the invention, and any equivalent changes or modifications made within the spirit of the invention should be considered as falling within the scope of the invention.
The invention analyzes the reason of parasitic power generation based on the deficiency of the prior art, classifies the parasitic power and provides a calculation method of unnecessary parasitic power.
1. Several related terms are construed in the present invention
Parasitic work: work done by the wheels during running of the vehicle due to slip and slip;
parasitic power: work due to the slip and slip of the wheels in the running process of the vehicle in unit time;
wheel slip ratio: the ratio of the difference between the theoretical speed and the actual speed of the vehicle to the theoretical speed is called slip when the slip ratio is positive, and is called slip when the slip ratio is negative;
necessary slip and necessary slip: slip and spin caused by wheel rotation for normal driving of the vehicle, referred to as necessary slip and necessary spin;
optional slip and optional slip: for vehicles driven by double bridges and multiple bridges, slip and skid caused by different power radiuses of wheels on different driving bridges and/or different linear speeds of the wheels caused by different steering radiuses of the wheels on different driving bridges are called unnecessary slip and unnecessary skid;
essential parasitic work: work performed by the necessary slip and the necessary slip during the running of the vehicle;
unnecessary parasitic work: work performed by unnecessary slip or unnecessary slip during the running of the vehicle.
2. Analysis of parasitic work generation
Parasitic work is analyzed by the cause of wheel slip and slip. Wheel slip and skid results from the following:
(1) On the one hand, during the running of the vehicle, the tire generates certain deformation, and a trace amount of sliding friction is inevitably generated between the tire and the ground, and the theoretical speed and the actual speed deviate due to the deformation of the tire, so that the slip or the slip is generated. For a single-axle driving vehicle, only one axle provides driving force, and in the running process of the vehicle, certain slip is necessarily generated on the driving wheel and certain slip is generated on the driven wheel for driving the vehicle; for multi-axle (including dual-axle) drive vehicles, the wheels that generate the driving force likewise slip and the remaining wheels slip during the travel of the vehicle to drive the vehicle. Therefore, whenever a vehicle runs, tires are deformed, and wheels are required to slip and slide, which is a necessary condition for rotation of driving wheels and a necessary condition for rotation of driven wheels, regardless of whether the vehicle is a single-axle driving vehicle or a multi-axle driving vehicle. Slip and spin in this case are unavoidable, and thus work done is also unavoidable, and therefore this part of work is called necessary parasitic work by the present invention.
(2) On the other hand, in a double-axle or higher-drive vehicle, the power radius of the front and rear wheels is different due to the difference of vertical load, tire pressure and tire wear, and when there is no inter-axle differential mechanism between the front and rear drive axles (or multiple drive axles) and a rigid connection is made, the angular speeds of the front and rear wheels are the same, so that the linear speeds of the front and rear wheels must be the same in actual running, and in order for the vehicle to be able to run, the front and rear wheels must generate slip or slide, so that the linear speeds of the front and rear wheels are consistent, and the generated slide or slide is unnecessary. The analysis is as follows:
taking a double-axle driving vehicle as an example, in order to make the front and rear wheel speeds of the vehicle equal, the theoretical speeds of the front and rear wheels are equal in design, and the formula is as follows:
v t1 ＝v t2 ＝ω 1 r t1 ＝ω 2 r t2
wherein:
v t1 is the theoretical speed of the front wheel;
v t2 is the theoretical speed of the rear wheel;
ω 1 is the angular velocity of the front wheel;
ω 2 is the angular velocity of the rear wheel;
r t1 is the average value of the static radius of the front wheel;
r t2 is the average value of the static radius of the rear wheel;
because the front axle and the rear axle are rigidly connected, omega 1 ＝ω 2 。
The power radius of the actual front and rear wheels is different due to different vertical loads of the front and rear wheels, different tire pressure errors, different wear degrees, manufacturing errors and the like, r 1 ≠r 2 Thus v t1 ≠v t2 ；
However, when the vehicle is actually running, the actual running speeds of the wheels on different bridges should be equal, v=v 1 ＝v 2 This entails that the wheels slip or spin, so that the front and rear wheel speeds remain consistent, expressed by the introduction of slip ratio as follows:
v 1 ＝v t1 (1-δ 1 )
v 2 ＝v t2 (1-δ 2 )
wherein:
δ 1 is the front wheel slip rate;
δ 2 is the rear wheel slip rate;
the following steps are obtained:
substituting formula (1) to obtain:
deducing:
setting upThe following steps are obtained:
δ 1 ＝(1-k)+kδ 2
obtaining delta 1 And delta 2 The relationship diagram is shown in fig. 1 and analyzed as follows:
1) When r is 1 ＝r 2 Delta when 1 And delta 2 Is a straight line OA, delta under this condition 1 And delta 2 Always equal, the vehicle motion is coordinated, and unnecessary parasitic power is not generated;
2) When r is 1 >r 2 Delta when 1 And delta 2 The relation curve of (a) is a straight line CA which is obtained by clockwise rotation by taking the point A as the rotation center, when the vertical load of the front wheel is larger than that of the rear wheel, the adhesive force of the front wheel is larger than that of the rear wheel, and at the moment, the rear wheel slides to generate braking force due to the uncooled movement caused by the difference of the radius of the front wheel and the rear wheel, so that unnecessary parasitic work and delta are generated 1 And delta 2 The value of (a) is within a feasible region BOC formed by a straight line and a second quadrant, delta 1 And delta 2 Different number, delta 1 Positive, representing front wheel slip, delta 2 Negative, representing rear wheel slip; when the vertical load of the front wheel is smaller than that of the rear wheel, the adhesive force of the front wheel is smaller than that of the rear wheel, and at the moment, the front wheel is over-slipped due to the uncooled movement caused by the difference of the radius of the front wheel and the rear wheel, so that unnecessary parasitic work, delta, is generated 1 And delta 2 The value of (a) is within the feasible region AOB formed by the straight line and the first quadrant, delta 1 And delta 2 Same number, delta 1 >δ 2 Representing the over-slip of the front wheel;
3) When r is 1 <r 2 Delta when 1 And delta 2 The relation curve of (a) is that a straight line OA takes the point A as the rotation center and goes throughThe hour hand rotates the resulting straight line C' a. When the vertical load of the front wheel is larger than that of the rear wheel, the adhesive force of the front wheel is larger than that of the rear wheel, and at the moment, the rear wheel is over-slipped due to the uncooled movement caused by the difference of the radius of the front wheel and the rear wheel, so that unnecessary parasitic work, delta, is generated 1 And delta 2 The value of (a) is within a feasible region AOB' formed by a straight line and a first quadrant, delta 1 And delta 2 Same number, delta 1 <δ 2 Representing the rear wheel over slip. When the vertical load of the front wheel is smaller than that of the rear wheel, the adhesive force of the front wheel is smaller than that of the rear wheel, and at the moment, the front wheel slides to generate braking force due to the uncoordinated movement caused by the difference of the radius of the front wheel and the rear wheel, so that unnecessary parasitic work, delta, is generated 1 And delta 2 The value of (a) is within a feasible region B' OC formed by the straight line and the fourth quadrant, delta 1 And delta 2 Different number, delta 1 Negative, representing front wheel slip, delta 2 Positive, representing rear wheel slip.
To sum up, the slip ratio delta of the vehicle 1 And delta 2 In a linear relationship with the value of k,not only do it with->In linear relationship, i.e. slip and spin of the wheel with r 1 And r 2 Related to the relationship of (3).
From the above analysis, it is known that the two-axle and multi-axle driving vehicles generate slip or slide of the wheels due to the linear speed difference caused by the difference of the power radius because of the same angular speed of the front and rear wheels, and the slide and slide are unnecessary, and the work is called unnecessary parasitic work. By explaining through actual working conditions, under the condition that the difference of the ground attachment coefficients is not considered, the front wheels and the rear wheels can provide different adhesive force on the ground due to different vertical loads, so that in the running process of the vehicle, wheels with small vertical loads can break through the ground attachment limit to generate unnecessary slip or slip when the motions are uncoordinated, and further unnecessary parasitic work is generated.
(3) On the other hand, in a vehicle driven by a double (or multiple) axle, when the vehicle turns, the wheels may slip or slip due to the difference in linear speed caused by the difference in steering radius (i.e., the difference in travel distance) due to the same angular speed of the front and rear wheels. The integral frame (Ackerman steering) can cause the front wheels and the rear wheels to slip or slide due to different walking distances of different front and rear wheel steering radiuses during steering; for articulated frames (articulated steering), the steering radius, i.e. the travelling distance, is different due to the different distances of the articulation points from the front and rear axles, and the front and rear wheels must also slip or skid (wherein the axle near the articulation point has a large steering radius and the distance travelled is relatively far from the axle far from the articulation point). The work done by the slip or slip due to the different linear speeds resulting from the different steering radii of the wheels is also not necessary, and is also referred to as unnecessary parasitic work.
In summary, the parasitic power is divided into necessary parasitic power and unnecessary parasitic power, the necessary parasitic power is unavoidable in the running process of the vehicle, the unnecessary parasitic power can cause the power loss of the vehicle, the unnecessary abrasion of the tire is caused, and the energy is wasted. In order to clarify the influence of the work on the running of the vehicle and improve the driving force and the fuel efficiency of the whole vehicle, the invention provides a calculation method of unnecessary parasitic work.
3. Calculation method of unnecessary parasitic power
A double-axle articulated vehicle is representative for calculating unnecessary parasitic work.
(1) The transmission shafts of the front axle and the rear axle of the double-axle driving vehicle are rigidly connected, so that the angular speeds of the front wheel and the rear wheel are the same, the linear speeds of the front wheel and the rear wheel are different due to the change of the power radius, sliding friction work is generated relative to the ground, and the distance travelled by the vehicle relative to the ground is expressed as follows:
L car ＝2πr 1 -l 1
L car ＝2πr 2 +l 2
wherein:
L car : distance traveled by the entire vehicle relative to the ground
l 1 : distance of sliding friction of front wheel relative to ground
l 2 : distance of sliding friction of rear wheel relative to ground
The simultaneous results are as follows:
d＝l 1 +l 2 ＝2π·△r＝2π·|r 1 -r 2 |
wherein:
d: the sum of the sliding friction distance between the front wheel and the ground and the sliding friction distance between the rear wheel and the ground;
in actual driving working conditions, under the condition that the difference of the ground attachment coefficients is not considered, the friction force between the wheels of the front axle and the ground of the front axle and the wheels of the rear axle are different due to the difference of the front vertical load and the rear vertical load, the friction force between the wheels with small vertical load and the ground is small relative to the friction force between the other wheels and the ground, the wheels slip, unnecessary slip or sliding is generated, and then unnecessary parasitic work is generated, and the related formulas are as follows:
f 1 ＝μG 1
f 2 ＝μG 2
wherein:
f 1 : sliding friction of front wheel
f 2 : rear wheel sliding friction
Mu: coefficient of sliding friction between wheel and ground
G 1 : front axle vertical load
G 2 : vertical load of rear wheel
Therefore, the work done by the friction between the wheel with the ground and the wheel with smaller sliding friction force is equal to the unnecessary parasitic work.
f x ＝min(f 1 ,f 2 )
Wherein:
f x : the minimum value of the sliding friction force of the front axle and the rear axle relative to the ground is obtained by taking a small function;
the unnecessary parasitic power is obtained by the formula:
W＝f x ·d
W＝f x ·2π·|r 1 -r 2 | (1)
wherein:
w: is unnecessary parasitic work;
(2) For any R 1 、R 2 The unnecessary parasitic power calculation method under different conditions exists, namely the position of the hinge point from the front axle and the rear axle, the turning situation or the straight line situation is discussed as follows:
from FIG. 2, the steering radius R of the front and rear axles is determined 1 、R 2 The method comprises the following steps of:
further, when L 1 ＝L 2 When the hinge point is positioned at the midpoint of the distance between the front axle and the rear axle, the steering radius formula is as follows:
wherein:
R 1 : the steering radius of the front axle;
R 2 : the steering radius of the rear axle;
L 1 : the distance from the front axle to the hinge point;
L 2 : the distance from the rear axle to the hinge point;
gamma: a vehicle corner;
l: front-rear axle distance;
(3.2.1) when L 1 ＝L 2 In the time-course of which the first and second contact surfaces,
for R 1 ＝R 2 The case where R is 0 is straight, and the case where R is not 0 is cornering, there is no slippage or slip of the front and rear wheels due to the difference in distance travelled by the different linear speeds of the front and rear wheels, so that there is no unnecessary work, and only unnecessary parasitic work is generated due to the difference in power radius, see the above formula (1).
(3.2.2) when L 1 ≠L 2 When (i.e. the hinge point is not located at the frontWhen the rear axle is at the midpoint of the distance
(1) When R is 1 ＝R 2 When =0, that is, when the vehicle is running straight, there is no slippage or slip of the front and rear wheels due to the difference in the distance travelled by the different linear speeds of the front and rear wheels, so that there is no unnecessary work, and only unnecessary parasitic work generated by the difference in the radius of power, see the above formula (1), and the analysis in (3.2.1) is the same.
(2) When R is 1 ≠R 2 In the time-course of which the first and second contact surfaces,
for unnecessary parasitic power generated by different steering radiuses of the front axle and the rear axle, firstly calculating the difference between the distances travelled by the front wheel and the rear wheel of the vehicle after completing one turn, and further obtaining the unnecessary parasitic power generated after the vehicle completes one turn; further, unnecessary parasitic work of the wheel rotating one turn can be obtained.
According to the following: l=2pi|r 1 -R 2 |
Wherein:
l: the vehicle completes the distance of sliding friction relative to the ground after turning for one turn;
then the formula of the unnecessary parasitic work generated after the vehicle completes a turn is:
W * ＝f x ·l
W * ＝f x ·2π|R 1 -R 2 |
wherein:
W * : unnecessary parasitic work generated after the vehicle completes a turn;
the number of turns of the wheels required by unnecessary parasitic power generated after the vehicle finishes turning one turn is set as n, and the formula is as follows:
note that: r is R x 、r x And f x Correspondingly, if f x ＝f 1 R is then x ＝R 2 、r x ＝r 2 The method comprises the steps of carrying out a first treatment on the surface of the If f x ＝f 2 R is then x ＝R 1 、r x ＝r 1 . The wheel rolls one circle of productionThe parasitic work generated is:
therefore, for r 1 ≠r 2 ，R 1 ≠R 2 The parasitic work of the working condition, namely the wheel rotating for one circle, is formed by two parts:
after analyzing the generation mechanism of unnecessary parasitic power, the calculation formula of the parasitic power under the actual working condition is obtained:
a)f 1 >f 2 and R is 1 >R 2 And r is 1 >r 2 When the steering radius is different, the rear wheel slides to generate unnecessary parasitic power, and the tire radius is different, so that the rear wheel slides to generate unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
b)f 1 >f 2 and R is 1 >R 2 And r is 1 <r 2 When the steering radius is different, the rear wheel slip generates unnecessary parasitic power, and the tire radius is different, so that the rear wheel slip generates unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
c)f 1 >f 2 and R is 1 <R 2 And r is 1 >r 2 When the steering radius is different, the rear wheel slip generates unnecessary parasitic work, and the tire radius is different, so that the rear wheel slip generates unnecessary parasitic work. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
d)f 1 >f 2 and R is 1 <R 2 And r is 1 <r 2 When the steering radius is different, the rear wheel slip generates unnecessary parasitic work, and the tire radius is different, so that the rear wheel slip generates unnecessary parasitic work. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
e)f 1 <f 2 and R is 1 >R 2 And r is 1 >r 2 When the steering radius is different, the front wheel slides to generate unnecessary parasitic power, and the tire radius is different, so that the front wheel slides to generate unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
f)f 1 <f 2 and R is 1 >R 2 And r is 1 <r 2 When the steering radius is different, the front wheel slides to generate unnecessary parasitic power, and the tire radius is different, so that the front wheel slides to generate unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
g)f 1 <f 2 and R is 1 <R 2 And r is 1 >r 2 When the steering radius is different, the front wheel rotates to generate unnecessary parasitic power, and the tire radius is different, so that the front wheel rotates to generate unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
h)f 1 <f 2 and R is 1 <R 2 And r is 1 <r 2 When the steering radius is different, the front wheel slides to generate unnecessary parasitic power, and the tire radius is different, so that the front wheel slides to generate unnecessary parasitic power. In summary, the calculation formula of unnecessary parasitic power under the working condition is as follows:
the invention further analyzes the parasitic power deeply from the mechanism of parasitic power generation to obtain different parasitic powers generated by different working conditions, and some parasitic powers are unavoidable and some are avoided, so that the power loss of the vehicle can be controlled to be reduced as much as possible.
Claims (2)
1. A calculation method of unnecessary parasitic power of a vehicle is characterized in that: parasitic work generated by wheel slip or slippage of the double-axle or above-axle driven vehicle due to the fact that the angular speeds of the wheels are the same and the linear speeds of the wheels are different is used as unnecessary parasitic work;
for a dual axle and above axle driven vehicle, the unnecessary parasitic work done by the wheels includes two aspects, the sizes of which are respectively:
W＝2π·f x |r 1 -r 2 sum of I
Wherein,
f x ＝min(f 1 ,f 2 )
f 1 : sliding friction of front wheel
f 2 : rear wheel sliding friction
r 1 : radius of front wheel power
r 2 : radius of rear wheel power
R 1 : steering radius of front axle
R 2 : steering radius of rear axle
R x 、r x And f x Correspondingly, if f x ＝f 1 R is then x ＝R 2 、r x ＝r 2 The method comprises the steps of carrying out a first treatment on the surface of the If f x ＝f 2 R is then x ＝R 1 、r x ＝r 1
n: unnecessary parasitic work generated after the vehicle completes one turn requires the number of turns of the wheel
For articulated vehicles, provision is made for
L 1 : front axle to hinge point distance
L 2 : rear axle to hinge point distance
(1) When r is 1 ＝r 2 ，L 1 ＝L 2 When the unnecessary parasitic power is 0;
(2) When r is 1 ＝r 2 ，L 1 ≠L 2 In the time-course of which the first and second contact surfaces,
1) If R is 1 ＝R 2 =0, unnecessary parasitic work is 0;
2) If R is 1 ≠R 2 Unnecessary parasitic work is:
(3) When r is 1 ≠r 2 ，L 1 ＝L 2 When unnecessary parasitic work is:
W＝2π·f x |r 1 -r 2 |
(4) When r is 1 ≠r 2 ，L 1 ≠L 2 In the time-course of which the first and second contact surfaces,
1) If R is 1 ＝R 2 =0, unnecessary parasitic work is: w=f x ·2π·|r 1 -r 2 |
2) If R is 1 ≠R 2 Unnecessary parasitic work is: W+W'.
2. The method for calculating unnecessary parasitic power of a vehicle according to claim 1, wherein: in actual engineering, the following is directly calculated:
a)f 1 >f 2 and R is 1 >R 2 And r is 1 >r 2 When unnecessary parasitic work is:
b)f 1 >f 2 and R is 1 >R 2 And r is 1 <r 2 When unnecessary parasitic work is:
c)f 1 >f 2 and R is 1 <R 2 And r is 1 >r 2 When unnecessary parasitic work is:
d)f 1 >f 2 and R is 1 <R 2 And r is 1 <r 2 When unnecessary parasitic work is:
e)f 1 <f 2 and R is 1 >R 2 And r is 1 >r 2 When unnecessary parasitic work is:
f)f 1 <f 2 and R is 1 >R 2 And r is 1 <r 2 When unnecessary parasitic work is:
g)f 1 <f 2 and R is 1 <R 2 And r is 1 >r 2 When unnecessary parasitic work is:
h)f 1 ＜f 2 and R is 1 ＜R 2 And r is 1 ＜r 2 When unnecessary parasitic work is:
wherein: l=2pi|r 1 -R 2 |、d＝2π·|r 1 -r 2 |。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111387478.0A CN113895445B (en) | 2021-11-22 | 2021-11-22 | Parasitic power classification and unnecessary parasitic power calculation method for vehicle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010076703A (en) * | 2008-09-29 | 2010-04-08 | Sumitomo Rubber Ind Ltd | Method and device for estimating wheel load of tire, and program for estimating wheel load of tire |
| CN104411550A (en) * | 2012-06-22 | 2015-03-11 | 克诺尔商用车制动***有限公司 | Method for operating a wheel slip control apparatus with compensated wheel speeds |
| CN105359373A (en) * | 2013-07-17 | 2016-02-24 | 皇家飞利浦有限公司 | Wireless inductive power transfer |
| CN107199884A (en) * | 2017-05-08 | 2017-09-26 | 吉林大学 | Torque distribution method for reducing the average slippage rate of axletree |
| CN111565962A (en) * | 2018-01-08 | 2020-08-21 | 康明斯有限公司 | System and method for recharging plug-in electric vehicle accessories during battery charging |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10759443B2 (en) * | 2017-02-27 | 2020-09-01 | Cnh Industrial America Llc | System and method for detecting parastic power circulation within a work vehicle |
| US10370826B2 (en) * | 2017-03-08 | 2019-08-06 | Cnh Industrial America Llc | System and method for reducing fuel consumption of a work vehicle |
| US10793092B2 (en) * | 2017-12-29 | 2020-10-06 | Cnh Industrial America Llc | System and method for reducing fuel consumption of a work vehicle based on estimated parastic power losses |
| US10752188B2 (en) * | 2017-12-29 | 2020-08-25 | Cnh Industrial America Llc | System and method for reducing fuel consumption of a work vehicle based on estimated fan-based and/or alternator-based power losses |
-
2021
- 2021-11-22 CN CN202111387478.0A patent/CN113895445B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010076703A (en) * | 2008-09-29 | 2010-04-08 | Sumitomo Rubber Ind Ltd | Method and device for estimating wheel load of tire, and program for estimating wheel load of tire |
| CN104411550A (en) * | 2012-06-22 | 2015-03-11 | 克诺尔商用车制动***有限公司 | Method for operating a wheel slip control apparatus with compensated wheel speeds |
| CN105359373A (en) * | 2013-07-17 | 2016-02-24 | 皇家飞利浦有限公司 | Wireless inductive power transfer |
| CN107199884A (en) * | 2017-05-08 | 2017-09-26 | 吉林大学 | Torque distribution method for reducing the average slippage rate of axletree |
| CN111565962A (en) * | 2018-01-08 | 2020-08-21 | 康明斯有限公司 | System and method for recharging plug-in electric vehicle accessories during battery charging |
Non-Patent Citations (3)
| Title |
|---|
| 井下车辆在行驶中寄生功率的产生和预防;周锋涛;机电产品开发与创新;第27卷(第5期);第47-48页 * |
| 电动车辆双桥驱动寄生功率特性仿真;于英等;系 统 仿 真 学 报;第19卷(第21期);第5015-5019页 * |
| 路面条件对双桥驱动车辆寄生功率的影响;柴盛典;农业工程学报;第141-144页 * |
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