CN114383854B - Method for checking equivalent ramp of automobile parking ramp - Google Patents

Method for checking equivalent ramp of automobile parking ramp Download PDF

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Publication number
CN114383854B
CN114383854B CN202111419375.8A CN202111419375A CN114383854B CN 114383854 B CN114383854 B CN 114383854B CN 202111419375 A CN202111419375 A CN 202111419375A CN 114383854 B CN114383854 B CN 114383854B
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Prior art keywords
slope
automobile
equivalent
ramp
parking
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CN114383854A (en
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丛元英
马薇
刘春玲
韩菂
宋晨媛
杨天时
汤超
王翠
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College Of Humanities & Information Changchun University Of Technology
Jilin Communications Polytechnic
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College Of Humanities & Information Changchun University Of Technology
Jilin Communications Polytechnic
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
    • G01L5/288—Measuring the force necessary to rotate a braked wheel

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to an automobile parking ramp equivalent slope table inspection method, and belongs to the field of parking brake performance inspection. The automobile wheel-mounted anti-slip device comprises an equivalent slope (1), an equivalent slope table (2), an equivalent slope table (3) and an equivalent slope table (4) which are the same in size, wherein the attachment coefficient of the equivalent slope (1), the equivalent slope table (2), the equivalent slope table (3) and the equivalent slope table (4) is greater than or equal to 0.7, and the length of the equivalent slope is longer than the diameter of an automobile wheel. The invention overcomes the defects that the existing brake inspection bench inspection method is limited by inspection sites, vehicles and the like, and can not detect all vehicles; the equivalent detection method mainly comprises a traction method and a sliding plate method, and when the equivalent detection method is used, the calculation result is not accurate enough and a plurality of problems such as about are needed to be carried out. The invention applies the virtual displacement principle, and can solve the inaccuracy when the equivalent slope platform is used for calculating the braking force.

Description

Method for checking equivalent ramp of automobile parking ramp
Technical Field
The invention relates to an automobile parking ramp equivalent slope table inspection method, and belongs to the field of parking brake performance inspection.
Background
Parking brake performance testing is an important test item for automotive testing. According to the related standard requirements, the parking brake test of the automobile can be tested by adopting a brake test bench or an equivalent method. At present, a brake inspection bench inspection method is limited by an inspection site, vehicles and the like, and cannot detect all vehicles; the equivalent detection method is mainly a traction method and a sliding plate method, and when the equivalent detection method is used, the calculation result is not accurate enough and needs to be about.
Disclosure of Invention
The invention aims to provide an equivalent ramp inspection method for an automobile parking ramp, which overcomes the defects that the existing brake inspection ramp inspection method is limited by inspection sites, vehicles and the like and cannot detect all vehicles; the equivalent detection method mainly comprises a traction method and a sliding plate method, and when the equivalent detection method is used, the calculation result is not accurate enough and a plurality of problems such as about are needed to be carried out.
In order to achieve the above purpose, the invention provides an equivalent slope platform device of an automobile parking slope, which comprises an equivalent slope platform 1, an equivalent slope platform 2, an equivalent slope platform 3 and an equivalent slope platform 4.
The equivalent slope tables 1, 2, 3, 4 are the same in size.
The equivalent slope table 1, the equivalent slope table 2, the equivalent slope table 3, the equivalent slope table 4, the adhesion coefficient is more than or equal to 0.7, and the length is longer than the diameter of the automobile wheels.
The invention provides a checking method according to the automobile parking ramp equivalent ramp device, which comprises the following steps:
(1) The automobile runs forward and stably on a parking ramp, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(2) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(3) The automobile runs forward and stably on an equivalent slope table, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(4) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating the parking braking force of the equivalent ramp to the rear wheels;
(5) The automobile reversely and stably runs on a parking ramp, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(6) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(7) The automobile runs reversely and stably to an equivalent slope table, the automobile is stopped stably by a service brake, and the transmission is placed in a neutral gear.
(8) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating the parking braking force of the equivalent ramp to the rear wheels;
Further, the step 2 includes the following formula:
Gsinθε-(FX+Ff1+Ff2)ε＝0 (1)
Ff1+Ff2＝fj(FN1+FN2)＝fjGcosθ (2)
Gsinθε-(FX+fjGcosθ)ε＝0 (3)
FX＝(sinθ-fjcosθ)G (4)
Wherein G is the vehicle gravity, θ is the ramp angle, F f2 is the front wheel static friction force when the vehicle is on a ramp, F f1 is the rear wheel static friction force when the vehicle is on a ramp, F N2 is the supporting reaction force of the ramp slope to the front wheel when the vehicle is on a ramp, F N1 is the supporting reaction force of the ramp slope to the rear wheel when the vehicle is on a ramp, F j is the static rolling resistance coefficient, and F X is the parking braking force of the ramp slope to the rear wheel when the vehicle is on a ramp.
Further, the step 4 includes the following formula:
Gsinθε-(FX′+Ff1′+Ff2′)ε＝0 (5)
Ff1′+Ff2′＝fj(FN1′+FN2′)＝fjGcosθ (6)
Gsinθε-(FX′+fjGcosθ)ε＝0 (7)
FX′＝(sinθ-fjcosθ)G (8)
Wherein F f2 ' is the static friction force of the front wheel when the automobile is on an equivalent slope, F f1 ' is the static friction force of the rear wheel when the automobile is on an equivalent slope, F N2 ' is the supporting reaction force of the slope platform inclined plane to the front wheel when the automobile is on an equivalent slope, F N1 ' is the supporting reaction force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope, and F X ' is the parking braking force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope.
Comparison of formulas (8) and (4): when the vehicle goes up a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
Further, the step 6 includes the following formula:
Gsinθε-(Fx″+Ff1″+Ff2″)ε＝0 (9)
Ff1″+Ff2″＝fj(FN1″+FN2″)＝fjGcosθ (10)
Gsinθε-(FX″+fjGcosθ)ε＝0 (11)
FX″＝(sinθ-fjcosθ)G (12)
Wherein F f2 ' is the static friction force of the front wheel when the automobile descends, F f1 ' is the static friction force of the rear wheel when the automobile descends, F N2 ' is the supporting reaction force of the slope surface to the front wheel when the automobile descends, F N1 "is a reaction force of the slope to the rear wheel when the vehicle is moving down the slope, and F X" is a parking braking force of the slope to the rear wheel when the vehicle is moving down the slope.
Formulas (4) and (12) show that: the required parking braking force F X is the same when the vehicle is parked on a parking ramp, regardless of whether it is ascending or descending.
Further, the step 8 includes the following formula:
Gsinθε-(F″′X+Ff1″′+Ff2″′)ε＝0 (13)
Ff1″′+Ff2″′＝fj(FN1″′+FN2″′)＝fjGcosθ (14)
Gsinθε-(FX″′+fjGcosθ)ε＝0 (15)
FX″′＝(sinθ-fjcosθ)G (16)
Wherein, F f2 ' "is the static friction force of the front wheel when the automobile descends an equivalent slope, F f1 '" is the static friction force of the rear wheel when the automobile descends an equivalent slope, F N2 ' "is the supporting reaction force of the slope to the front wheel when the automobile descends an equivalent slope, F N1 '" is the supporting reaction force of the slope to the rear wheel when the automobile descends an equivalent slope, F X ' "is the parking braking force of the slope to the rear wheel when the automobile descends an equivalent slope.
Comparison of formulas (12) and (16): when the vehicle runs down a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
Compared with the prior art, the invention has the following advantages:
1. The invention applies the virtual displacement principle, and can solve the inaccuracy when the equivalent slope platform is used for calculating the braking force.
2. The invention has simple structure, and can solve the problem that the existing brake inspection bench inspection method is limited by inspection sites, vehicles and the like and cannot detect all vehicles.
3. The invention has simple principle and is easy to be understood and mastered by a detector.
Drawings
FIG. 1 is a graph of force analysis of an automobile on a parking ramp.
FIG. 2 is a graph of force analysis for an equivalent ramp on an automobile.
FIG. 3 is a graph of force analysis when the car is down a park ramp.
FIG. 4 is a graph of force analysis of an automobile descending an equivalent ramp.
In fig. 1-4: 1-equivalent slope table 1, 2-equivalent slope table 2, 3-equivalent slope table 3, 4-equivalent slope table 4, 5-automobile front wheel, 6-automobile rear wheel and 7-parking slope.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. The examples listed below are only a further understanding and implementation of the technical solution of the present invention and do not constitute a further limitation of the claims of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
(1) The automobile runs forward and stably on a parking ramp, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(2) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(3) The automobile runs forward and stably on an equivalent slope table, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(4) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating the parking braking force of the equivalent ramp to the rear wheels;
(5) The automobile reversely and stably runs on a parking ramp, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear.
(6) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(7) The automobile runs reversely and stably to an equivalent slope table, the automobile is stopped stably by a service brake, and the transmission is placed in a neutral gear.
(8) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating the parking braking force of the equivalent ramp to the rear wheels;
the formula included in the step 2 is as follows:
Gsinθε-(FX+Ff1+Ff2)ε＝0 (1)
Ff1+Ff2＝fj(FN1+FN2)＝fjGcosθ (2)
Gsinθε-(FX+fjGcosθ)ε＝0 (3)
FX＝(sinθ-fjcosθ)G (4)
Wherein G is the vehicle gravity, θ is the ramp angle, F f2 is the front wheel static friction force when the vehicle is on a ramp, F f1 is the rear wheel static friction force when the vehicle is on a ramp, F N2 is the supporting reaction force of the ramp slope to the front wheel when the vehicle is on a ramp, F N1 is the supporting reaction force of the ramp slope to the rear wheel when the vehicle is on a ramp, F j is the static rolling resistance coefficient, and F X is the parking braking force of the ramp slope to the rear wheel when the vehicle is on a ramp.
The step 4 comprises the following formulas:
Gsinθε-(FX′+Ff1′+Ff2′)ε＝0 (5)
Ff1′+Ff2′＝fj(FN1′+FN2′)＝fjGcosθ (6)
Gsinθε-(FX′+fjGcosθ)ε＝0 (7)
FX′＝(sinθ-fjcosθ)G (8)
Wherein F f2 ' is the static friction force of the front wheel when the automobile is on an equivalent slope, F f1 ' is the static friction force of the rear wheel when the automobile is on an equivalent slope, F N2 ' is the supporting reaction force of the slope platform inclined plane to the front wheel when the automobile is on an equivalent slope, F N1 ' is the supporting reaction force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope, and F X ' is the parking braking force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope.
Comparison of formulas (8) and (4): when the vehicle goes up a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
The step 6 includes the following formulas:
Gsinθε-(FX″+Ff1″+Ff2″)ε＝0 (9)
Ff1″+Ff2″＝fj(FN1″+FN2″)＝fjGcosθ (10)
Gsinθε-(FX″+fjGcosθ)ε＝0 (11)
FX″＝(sinθ-fjcosθ)G (12)
Wherein F f2 ' is the static friction force of the front wheel when the automobile descends, F f1 ' is the static friction force of the rear wheel when the automobile descends, F N2 ' is the supporting reaction force of the slope surface to the front wheel when the automobile descends, F N1 "is a reaction force of the slope to the rear wheel when the vehicle is moving down the slope, and F X" is a parking braking force of the slope to the rear wheel when the vehicle is moving down the slope.
Formulas (4) and (12) show that: the required parking braking force F X is the same when the vehicle is parked on a parking ramp, regardless of whether it is ascending or descending.
The step 8 includes the following formulas:
Gsinθε-(F″′X+Ff1″′+Ff2″′)ε＝0 (13)
Ff1″′+Ff2″′＝fj(FN1″′+FN2″′)＝fjGcosθ (14)
Gsinθε-(FX″′+fjGcosθ)ε＝0 (15)
FX″′＝(sinθ-fjcosθ)G (16)
Wherein, F f2 ' "is the static friction force of the front wheel when the automobile descends an equivalent slope, F f1 '" is the static friction force of the rear wheel when the automobile descends an equivalent slope, F N2 ' "is the supporting reaction force of the slope to the front wheel when the automobile descends an equivalent slope, F N1 '" is the supporting reaction force of the slope to the rear wheel when the automobile descends an equivalent slope, F X ' "is the parking braking force of the slope to the rear wheel when the automobile descends an equivalent slope.
Comparison of formulas (12) and (16): when the vehicle runs down a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
Although embodiments of the invention have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (5)

1. The method for checking the equivalent slope platform of the automobile parking ramp comprises an equivalent slope platform 1, an equivalent slope platform 2, an equivalent slope platform 3 and an equivalent slope platform 4 which are the same in size, wherein the adhesion coefficient of the equivalent slope platform 1, the equivalent slope platform 2, the equivalent slope platform 3 and the equivalent slope platform 4 is more than or equal to 0.7, and the length of the equivalent slope platform is longer than the diameter of an automobile wheel, and the method is characterized by comprising the following steps:
(1) The automobile stably runs on a parking ramp in the forward direction, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear;
(2) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(3) The automobile stably runs on an equivalent slope table in the forward direction, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear;
(4) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, calculating the parking braking force of the equivalent ramp to the rear wheels, and comparing the parking braking forces obtained in the steps 2 and 4;
(5) The automobile reversely and stably runs on a parking ramp, the automobile is stopped stably by a service brake, and a transmission is placed in a neutral gear;
(6) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, and calculating parking braking force of the slope of the ramp to the rear wheels;
(7) The automobile reversely and stably runs on an equivalent slope table, the automobile is stopped by a service brake, and the transmission is placed in a neutral gear;
(8) According to the virtual displacement principle, setting downward virtual displacement epsilon of the automobile, calculating the parking braking force of the equivalent ramp to the rear wheels, and comparing the parking braking forces obtained in the steps 6 and 8.
2. The method for checking the equivalent ramp of the parking ramp of the automobile according to claim 1, wherein the step 2 comprises the following formula:
（1）
（2）
（3）
（4）
Wherein G is the vehicle gravity, θ is the ramp angle, F f2 is the front wheel static friction force when the vehicle is on a ramp, F f1 is the rear wheel static friction force when the vehicle is on a ramp, F N2 is the supporting reaction force of the ramp slope to the front wheel when the vehicle is on a ramp, F N1 is the supporting reaction force of the ramp slope to the rear wheel when the vehicle is on a ramp, F j is the static rolling resistance coefficient, and F X is the parking braking force of the ramp slope to the rear wheel when the vehicle is on a ramp.
3. The method for checking an equivalent ramp for an automobile parking ramp according to claim 1, wherein,
The step 4 comprises the following formulas:
（5）
（6）
（7）
（8）
Wherein F f2 ' is the static friction force of the front wheel when the automobile is on an equivalent slope, F f1 ' is the static friction force of the rear wheel when the automobile is on an equivalent slope, F N2 ' is the supporting reaction force of the slope platform inclined plane to the front wheel when the automobile is on an equivalent slope, F N1 ' is the supporting reaction force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope, and F X ' is the parking braking force of the slope platform inclined plane to the rear wheel when the automobile is on an equivalent slope;
Comparison of formulas (8) and (4): when the vehicle goes up a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
4. The method for checking the equivalent ramp of an automobile parking ramp according to claim 1, wherein said step 6 comprises the following formula:
（9）
（10）
（11）
（12）
Wherein F f2 ' is the static friction force of the front wheel when the automobile descends, F f1 ' is the static friction force of the rear wheel when the automobile descends, F N2 ' is the supporting reaction force of the ramp slope to the front wheel when the automobile descends, F N1 ' is the supporting reaction force of the ramp slope to the rear wheel when the automobile descends, and F X ' is the parking braking force of the ramp slope to the rear wheel when the automobile descends;
formulas (4) and (12) show that: the required parking braking force F X is the same when the vehicle is parked on a parking ramp, regardless of whether it is ascending or descending.
5. The method for checking the equivalent ramp of an automobile parking ramp according to claim 1, wherein said step 8 comprises the following formula:
（13）
（14）
（15）
（16）
Wherein F f2 ' is the static friction force of the front wheel when the automobile descends an equivalent slope, F f1 ' is the static friction force of the rear wheel when the automobile descends an equivalent slope, F N2 ' is the supporting reaction force of the slope to the front wheel when the automobile descends an equivalent slope, F N1 ' is the supporting reaction force of the slope to the rear wheel when the automobile descends an equivalent slope, F X ' is the parking braking force of the slope to the rear wheel when the automobile descends an equivalent slope;
comparison of formulas (12) and (16): when the vehicle runs down a slope, the parking braking force provided by the equivalent slope platform to the wheels of the vehicle is consistent with a parking slope method.
CN202111419375.8A 2021-11-26 2021-11-26 Method for checking equivalent ramp of automobile parking ramp Active CN114383854B (en)

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