CN108692952A - The measurement method and device of automobile passability parameter - Google Patents
The measurement method and device of automobile passability parameter Download PDFInfo
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- CN108692952A CN108692952A CN201810254698.8A CN201810254698A CN108692952A CN 108692952 A CN108692952 A CN 108692952A CN 201810254698 A CN201810254698 A CN 201810254698A CN 108692952 A CN108692952 A CN 108692952A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention discloses a kind of measurement method and device of automobile passability parameter, the method includes:Obtain front-wheel static(al) radius, trailing wheel static(al) radius, the first height, the second height, third height, the first length, the second length, third length and the 4th length of the automobile;Based on the first preset formula, approach angle is obtained according to front-wheel static(al) radius, the first height and the first length computation;Based on the second preset formula, departure angle is obtained according to trailing wheel static(al) radius, the second height and the second length computation;Based on third preset formula, ramp breakover angle is obtained according to front-wheel static(al) radius, trailing wheel static(al) radius, third length, third height and the 4th length computation.The measurement method of automobile passability parameter proposed by the present invention, can calculate every passability parameter of determining automobile, and accurate evaluation is made by performance to automobile.
Description
Technical field
The present invention relates to automobile parameter field of measuring technique, more particularly to a kind of measurement method of automobile passability parameter with
Device.
Background technology
With the development of economy with the progress of technology, city dweller's car ownership rapidly increasing, road traffic accident
Have become one of the important threat of human life's safety.Therefore the general safety performance for how improving automobile, has become
The most important research direction of automobile engineer.
It is to weigh an important reference index of automobile entirety driving performance by sexuality for automobile.Tool
Body, automobile refers to that automobile passes through various road surfaces and various obstacles (such as abrupt slope, side slope, trench and platform by sexuality
Rank etc.) ability.In general, Ramp Angles, departure angle and ramp breakover angle directly decide automobile pass through sexuality.
Wherein, when ramp breakover angle refers to that automobile is unloaded, fully loaded static, tangent plane is made by front and back wheel outer rim respectively, when two planes
Meet at minimum acute angle folded when lower car body lower position;When approach angle refers to that automobile is unloaded, fully loaded static, front end protrudes
Angle of the point to front-wheel drawn tangent line and ground;When departure angle refers to that automobile is unloaded, fully loaded static, rear end projecting point is to front-wheel
The angle of drawn tangent line and ground.
However, in practical measurement process, the measurement due to being related to angle needs to make tangent line in the lateral margin of tire, such
Measurement method will largely influence the accuracy measured.
Invention content
Based on this, the purpose of the present invention is to solve in the prior art, when measuring the passability angle of automobile, due to
The measurement for being related to angle needs to make tangent line in the lateral margin of tire, and such measurement method will largely influence the standard measured
The problem of true property.
The present invention proposes that a kind of measurement method of automobile passability parameter, the passability parameter include the close of automobile
Angle, departure angle and ramp breakover angle, wherein described method includes following steps:
Obtain the front-wheel static(al) radius of the automobile, trailing wheel static(al) radius, the first height, the second height, third height,
One length, the second length, third length and the 4th length, wherein first height is automotive front end projecting point to ground
Vertical range, second height are vertical range of the automobile rear end projecting point to ground, and the third height is before and after automobile
Axis centre position minimum point to ground vertical range, first length be automotive front end projecting point ground subpoint extremely
The horizontal distance of nosewheel contact point, second length be automobile rear end projecting point ground subpoint to trailing wheel earth point
Distance, the third length and the 4th length are respectively subpoint of the automobile antero posterior axis centre position minimum point on ground
To the distance of front and back wheel earth point;
Based on the first preset formula, according to the front-wheel static(al) radius, first height and first length gauge
Calculation obtains the approach angle;
Based on the second preset formula, according to the trailing wheel static(al) radius, second height and second length gauge
Calculation obtains the departure angle;
Based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) radius, the third length,
The third height and the 4th length computation obtain the ramp breakover angle.
The measurement method of automobile passability parameter proposed by the present invention obtains automobile first in practical measurement process
Front-wheel static(al) radius, trailing wheel static(al) radius, the first height, the second height, third height, the first length, the second length, third are long
Degree and the 4th length are avoided since above-mentioned radius, height and length value can be accurately measured by making tangent line
Mode carry out the measurement of angle, then according to radius value, length value and the height value measured, according to corresponding formula point
Approach angle, departure angle and ramp breakover angle Zhuan Huan not be calculated, the accuracy higher for the angle being calculated improves
The accuracy of automobile judged by sexuality.
In addition, the analysis method of automobile passability parameter according to the above embodiment of the present invention, can also have following attached
The technical characteristic added:
The measurement method of the automobile passability parameter, wherein first preset formula is:
Wherein, a is the approach angle, L1For first length, H1For first height, RfFor the front-wheel static(al)
Radius.
The measurement method of the automobile passability parameter, wherein second preset formula is:
Wherein, β is the departure angle, L2For second length, H2For second height, RrFor the trailing wheel static(al)
Radius.
The measurement method of the automobile passability parameter, wherein the method for calculating the ramp breakover angle includes following step
Suddenly:
Based on first longitudinal direction by angle formula, according to the third length, the third height and the front-wheel static(al)
Radius is calculated first longitudinal direction and passes through angle;
Based on second longitudinal direction by angle formula, according to the third height, the 4th length and the trailing wheel static(al)
Radius is calculated second longitudinal direction and passes through angle;
The first longitudinal direction is added by angle to obtain the ramp breakover angle by angle and the second longitudinal direction.
The measurement method of the automobile passability parameter, wherein the first longitudinal direction is by angle formula:
Wherein, γ1Pass through angle, L for the first longitudinal direction3For the third length, H3For the third height, RfFor institute
State front-wheel static(al) radius.
The measurement method of the automobile passability parameter, wherein the second longitudinal direction is by angle formula:
Wherein, γ2Pass through angle, L for the second longitudinal direction4For the 4th length, H3For the third height, RrFor institute
State trailing wheel static(al) radius.
The measurement method of the automobile passability parameter, wherein the third preset formula is:
Wherein, γ is the ramp breakover angle.
The present invention also proposes that a kind of measuring device of automobile passability parameter, the passability parameter include the close of automobile
Angle, departure angle and ramp breakover angle, wherein described device includes:
Parameter acquisition module, for obtaining the front-wheel static(al) radius of the automobile, trailing wheel static(al) radius, the first height, the
Two height, third height, the first length, the second length, third length and the 4th length, wherein first height is automobile
For front end projecting point to the vertical range on ground, second height is vertical range of the automobile rear end projecting point to ground, described
Third height is vertical range of the automobile antero posterior axis centre position minimum point to ground, and first length protrudes for automotive front end
The subpoint on ground is put to the horizontal distance of nosewheel contact point, second length is throwing of the automobile rear end projecting point on ground
Shadow point to trailing wheel earth point distance, the third length and the 4th length be respectively automobile antero posterior axis centre position most
Low spot ground subpoint to front and back wheel earth point distance;
First computing module, for be based on the first preset formula, according to the front-wheel static(al) radius, first height with
And first length computation obtains the approach angle;
Second computing module, for be based on the second preset formula, according to the trailing wheel static(al) radius, second height with
And second length computation obtains the departure angle;
Third computing module, for being based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) half
Diameter, the third length, the third height and the 4th length computation obtain the ramp breakover angle.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein:
Fig. 1 is the flow chart of the measurement method for the automobile passability parameter that first embodiment of the invention proposes;
The schematic diagram of approach angle in the measurement method for the automobile passability parameter that Fig. 2 proposes for second embodiment of the invention;
The schematic diagram of departure angle in the measurement method for the automobile passability parameter that Fig. 3 proposes for second embodiment of the invention;
The signal of ramp breakover angle in the measurement method for the automobile passability parameter that Fig. 4 proposes for second embodiment of the invention
Figure;
Fig. 5 is the structural schematic diagram of the measuring device for the automobile passability parameter that third embodiment of the invention proposes.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In practical measurement process, the measurement due to being related to angle needs to make tangent line, such measurement in the lateral margin of tire
Mode will largely influence the accuracy measured.
In order to solve this technical problem, the present invention proposes a kind of measurement method of automobile passability parameter, please refers to figure
1, for the measurement method for the automobile passability parameter that first embodiment of the invention proposes, described method includes following steps:
S101 obtains front-wheel static(al) radius, trailing wheel static(al) radius, the first height, the second height, the third height of the automobile
Degree, the first length, the second length, third length and the 4th length.
In the present embodiment, in order to evaluate automobile by sexuality, approach angle, the departure angle of automobile is obtained by calculation
And ramp breakover angle carries out overall merit.
In this step, the parameters for measuring and obtaining automobile are pressed for the first time.Specifically, the first above-mentioned height is before automobile
Hold projecting point to the vertical range on ground;Second height is vertical range of the automobile rear end projecting point to ground, and third height is
Automobile antero posterior axis centre position minimum point to ground vertical range.In addition, the first above-mentioned length is automotive front end projecting point
Ground subpoint to nosewheel contact point horizontal distance, the second length be automobile rear end projecting point ground subpoint extremely
The distance of trailing wheel earth point, third length and the 4th length are respectively throwing of the automobile antero posterior axis centre position minimum point on ground
Shadow point to front and back wheel earth point distance.
S102 is based on the first preset formula, according to the front-wheel static(al) radius, first height and first length
The approach angle is calculated in degree.
Specifically, in this step, which is represented by:
Wherein, it is approach angle, L1For the first length, H1For the first height, RfFor front-wheel static(al) radius.It should be understood that root
A is according to above-mentioned measured obtained front-wheel static(al) radius Rf, the first height H1And the first length L1Above-mentioned connect can be calculated
Nearly angle a.
S103 is based on the second preset formula, according to the trailing wheel static(al) radius, second height and second length
The departure angle is calculated in degree.
Specifically, in this step, which is represented by:
Wherein, β is departure angle, L2For the second length, H2For the second height, RrFor trailing wheel static(al) radius.It should be understood that
According to above-mentioned measured obtained trailing wheel static(al) radius Rr, the second height H2And the second length L2It can be calculated above-mentioned
Departure angle β.
S104 is based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) radius, the third
Length, the third height and the 4th length computation obtain the ramp breakover angle.
Wherein, the angle of the ramp breakover angle for first longitudinal direction by angle and second longitudinal direction by the angle at angle it
With.
Specifically, when calculating first longitudinal direction passes through angle, can be calculated by angle formula according to first longitudinal direction:
Wherein, γ1Pass through angle, L for first longitudinal direction3For third length, H3For third height, RfFor front-wheel static(al) radius.
When calculating second longitudinal direction passes through angle, can be calculated by angle formula according to second longitudinal direction:
Wherein, γ2Pass through angle, L for second longitudinal direction4For the 4th length, H3For third height, RrFor trailing wheel static(al) radius.
Pass through angle γ first longitudinal direction has been calculated1With second longitudinal direction by angle after, above-mentioned first longitudinal direction is led to
Cross angle γ1Pass through angle γ with second longitudinal direction2It is added and obtains ramp breakover angle γ2.Namely:
Wherein, γ is ramp breakover angle.
The measurement method of automobile passability parameter proposed by the present invention obtains automobile first in practical measurement process
Front-wheel static(al) radius, trailing wheel static(al) radius, the first height, the second height, third height, the first length, the second length, third are long
Degree and the 4th length are avoided since above-mentioned radius, height and length value can be accurately measured by making tangent line
Mode carry out the measurement of angle, then according to radius value, length value and the height value measured, according to corresponding formula point
Approach angle, departure angle and ramp breakover angle Zhuan Huan not be calculated, the accuracy higher for the angle being calculated improves
The accuracy of automobile judged by sexuality.
The technology contents of the present invention are illustrated in further detail with a specific example below.Please refer to Fig. 2 extremely
Fig. 4, for the measurement method for the automobile passability parameter that second embodiment of the invention proposes, the following institute of specific implementation mode
It states:
As noted previously, as during actual test, section AD, FH, PM, PQ and the intersection point of level ground can not be known
D, H, M, Q, and then just it is unable to measure out each intersection point and front and back wheel earth point C, I distance DC, HI, MC, QI.
It in order to solve this problem, in the present embodiment, will by way of carrying out fortran between angle and length
The parameters of the above-mentioned automobile measured are updated in corresponding formula, so solve obtain automobile approach angle,
Departure angle and ramp breakover angle.
Specifically, by △ DOC ≌ △ DOB, ∠ DOC=1/2 ∠ BOC can be derived;It can be derived by △ HEI ≌ △ HEG
∠ IEH=1/2 ∠ IEG;∠ COM=1/2 ∠ CON can be derived by △ MOC ≌ △ MON;It can be derived by △ QEI ≌ △ QER
∠ QEI=1/2 ∠ IER.
Namely:
∠ BOC=a;∠ IEG=β;∠ CON=γ1;∠ IER=γ2
It can be obtained according to trigonometric function relationship and above-mentioned triangle relation reasoning:
Further, it can be obtained according to trigonometric function relationship:
It is converted according to trigonometric function:
It obtains:
It can similarly obtain:
However, the angle value of ramp breakover angle γ, which is above-mentioned first longitudinal direction, passes through angle γ1Pass through angle γ with second longitudinal direction2
The sum of angle value.Namely:
Referring to Fig. 5, the measuring device of the automobile passability parameter proposed for third embodiment of the invention, described to pass through
Property parameter include automobile approach angle, departure angle and ramp breakover angle, wherein described device include be connected with each other parameter obtain
Modulus block 10, the first computing module 11, the second computing module 12 and third computing module 13;
Wherein, the parameter acquisition module 10 is specifically used for:
Obtain the front-wheel static(al) radius of the automobile, trailing wheel static(al) radius, the first height, the second height, third height,
One length, the second length, third length and the 4th length, wherein first height is automotive front end projecting point to ground
Vertical range, second height are vertical range of the automobile rear end projecting point to ground, and the third height is before and after automobile
Axis centre position minimum point to ground vertical range, first length be automotive front end projecting point ground subpoint extremely
The horizontal distance of nosewheel contact point, second length be automobile rear end projecting point ground subpoint to trailing wheel earth point
Distance, the third length and the 4th length are respectively subpoint of the automobile antero posterior axis centre position minimum point on ground
To the distance of front and back wheel earth point;
First computing module 11 is specifically used for:
Based on the first preset formula, according to the front-wheel static(al) radius, first height and first length gauge
Calculation obtains the approach angle;
Second computing module 12 is specifically used for:
Based on the second preset formula, according to the trailing wheel static(al) radius, second height and second length gauge
Calculation obtains the departure angle;
The third computing module 13 is specifically used for:
Based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) radius, the third length,
The third height and the 4th length computation obtain the ramp breakover angle.
It should be appreciated that each section of the present invention can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized:With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (8)
1. a kind of measurement method of automobile passability parameter, the passability parameter include the approach angle of automobile, departure angle and
Ramp breakover angle, which is characterized in that described method includes following steps:
Obtain the front-wheel static(al) radius of the automobile, trailing wheel static(al) radius, the first height, the second height, third height, the first length
Degree, the second length, third length and the 4th length, wherein first height is the vertical of automotive front end projecting point to ground
Distance, second height are vertical range of the automobile rear end projecting point to ground, and the third height is in automobile antero posterior axis
Between position minimum point to ground vertical range, first length be automotive front end projecting point ground subpoint to front-wheel
The horizontal distance of earth point, second length be automobile rear end projecting point ground subpoint to trailing wheel earth point away from
From, the third length and the 4th length be respectively automobile antero posterior axis centre position minimum point ground subpoint extremely
The distance of front and back wheel earth point;
Based on the first preset formula, obtained according to the front-wheel static(al) radius, first height and first length computation
To the approach angle;
Based on the second preset formula, obtained according to the trailing wheel static(al) radius, second height and second length computation
To the departure angle;
Based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) radius, the third length, described
Third height and the 4th length computation obtain the ramp breakover angle.
2. the measurement method of automobile passability parameter according to claim 1, which is characterized in that first preset formula
For:
Wherein, a is the approach angle, L1For first length, H1For first height, RfFor the front-wheel static(al) radius.
3. the measurement method of automobile passability parameter according to claim 1, which is characterized in that second preset formula
For:
Wherein, β is the departure angle, L2For second length, H2For second height, RrFor the trailing wheel static(al) radius.
4. the measurement method of automobile passability parameter according to claim 1, which is characterized in that calculate it is described longitudinally through
The method at angle includes the following steps:
Based on first longitudinal direction by angle formula, according to the third length, the third height and the front-wheel static(al) radius
First longitudinal direction is calculated and passes through angle;
Based on second longitudinal direction by angle formula, according to the third height, the 4th length and the trailing wheel static(al) radius
Second longitudinal direction is calculated and passes through angle;
The first longitudinal direction is added by angle to obtain the ramp breakover angle by angle and the second longitudinal direction.
5. the measurement method of automobile passability parameter according to claim 4, which is characterized in that the first longitudinal direction passes through
Angle formula is:
Wherein, γ1Pass through angle, L for the first longitudinal direction3For the third length, H3For the third height, RfFor the front-wheel
Static(al) radius.
6. the measurement method of automobile passability parameter according to claim 5, which is characterized in that the second longitudinal direction passes through
Angle formula is:
Wherein, γ2Pass through angle, L for the second longitudinal direction4For the 4th length, H3For the third height, RrFor the trailing wheel
Static(al) radius.
7. the measurement method of automobile passability parameter according to claim 6, which is characterized in that the third preset formula
For:
Wherein, γ is the ramp breakover angle.
8. a kind of measuring device of automobile passability parameter, the passability parameter include the approach angle of automobile, departure angle and
Ramp breakover angle, which is characterized in that described device includes:
Parameter acquisition module, for obtaining the front-wheel static(al) radius of the automobile, trailing wheel static(al) radius, the first height, second high
Degree, third height, the first length, the second length, third length and the 4th length, wherein first height is automotive front end
For projecting point to the vertical range on ground, second height is automobile rear end projecting point to the vertical range on ground, the third
Height is vertical range of the automobile antero posterior axis centre position minimum point to ground, and first length is that automotive front end projecting point exists
For the subpoint on ground to the horizontal distance of nosewheel contact point, second length is subpoint of the automobile rear end projecting point on ground
To the distance of trailing wheel earth point, the third length and the 4th length are respectively automobile antero posterior axis centre position minimum point
Ground subpoint to front and back wheel earth point distance;
First computing module, for being based on the first preset formula, according to the front-wheel static(al) radius, first height and institute
It states the first length computation and obtains the approach angle;
Second computing module, for being based on the second preset formula, according to the trailing wheel static(al) radius, second height and institute
It states the second length computation and obtains the departure angle;
Third computing module, for be based on third preset formula, according to the front-wheel static(al) radius, the trailing wheel static(al) radius,
The third length, the third height and the 4th length computation obtain the ramp breakover angle.
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Application publication date: 20181023 |
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