CN106643456B - A kind of pedal travel measuring device and method for driving data acquisition system - Google Patents
A kind of pedal travel measuring device and method for driving data acquisition system Download PDFInfo
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- CN106643456B CN106643456B CN201710056891.6A CN201710056891A CN106643456B CN 106643456 B CN106643456 B CN 106643456B CN 201710056891 A CN201710056891 A CN 201710056891A CN 106643456 B CN106643456 B CN 106643456B
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- foil gauge
- pedal
- pedal travel
- rear end
- drive rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Control Devices (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of pedal travel measuring devices and method for driving data acquisition system, measuring device includes pedal, first drive rod, second drive rod, cylindrical body, foil gauge and data acquisition and control module, wherein the first drive rod is hinged on the rear end of pedal, the rear end of first drive rod and the front end of the second drive rod are hinged, cylindrical body is connected to the rear end of the second drive rod, foil gauge is sticked on the cylinder, the rear end of cylindrical body is connected with spring, the rear end of spring is fixed in fixed plate, pedal assembly and fixed plate are respectively fixedly connected on bottom plate, data collection and control module is connected with the action signal of pedal lower end switch and foil gauge respectively.Measurement method are as follows: step 1: fitting function is determined；Step 2: fitting function is set in advance in pedal travel analog controller；Step 3: pedal travel is calculated.The utility model has the advantages that structure is simple, the cost of measuring system is effectively reduced.
Description
Technical field
The present invention relates to a kind of pedal travel measuring device and methods, in particular to a kind of to be used for driving data acquisition system
Pedal travel measuring device and method.
Background technique
Currently, the acquisition technique of driving data is basis and the necessary links of driver's behavioral study, in running car
The behavioral study of driver has great significance, and obtains the correlation that driver operates brake pedal, clutch pedal, accelerator pedal
Information is a ring important in driving data acquisition.Driver operate brake pedal, clutch pedal, accelerator pedal whether and phase
Pedal travel is answered all directly to reflect the manipulation intention and vehicle running state of driver.
Existing pedal travel measuring device and method for driving data acquisition system often uses displacement sensor,
Measuring system is at high cost, and is difficult to realize the accurate measurement of pedal travel.China Patent Publication No. is CN203605932U, open
Day is 2014.05.21, and a kind of entitled summary of the invention of automobile brake pedal displacement measuring device of utility model uses position
Displacement sensor results in greatly increasing for measuring system cost.If China Patent Publication No. is CN105620443A, publication date is
2016.06.01, the summary of the invention that a kind of entitled brake-pedal travel computing device and its calculation method are shown, will
Relationship between pedal travel and master cylinder pressure is described with the linear equation in multistage section, it is difficult to guarantee that pedal travel measures
Accuracy.
Summary of the invention
To be difficult to precise measurement pedal travel, apparatus structure multiple the purpose of the present invention is to solve of the existing technology
The problems such as miscellaneous, at high cost and a kind of pedal travel measuring device and method for driving data acquisition system provided.
Pedal travel measuring device provided by the present invention for driving data acquisition system includes pedal, the first transmission
Bar, the second drive rod, cylindrical body, foil gauge and data acquisition and control module, wherein after the first drive rod is hinged on pedal
End, the rear end of the first drive rod and the front end of the second drive rod are hinged, and cylindrical body is connected to the rear end of the second drive rod, strain
Piece is sticked on the cylinder, and the rear end of cylindrical body is connected with spring, and the rear end of spring is fixed in fixed plate, pedal assembly and solid
Fixed board is respectively fixedly connected on bottom plate, and data collection and control module switchs respectively with the action signal of pedal lower end and foil gauge phase
Connection.
Pedal Pedal is hinged on pedal support under the support of two support arms, and the connecting shaft of two support arm lower ends is equipped with
Return spring, several lightening holes are offered on the surface of pedal, and the shape of lightening hole is regular hexagon, side length 4.6-5.2mm.
Second drive rod is located on limiting bracket.
The spring of cylindrical body rear end is plugged in a sleeve, and the front end of sleeve is equipped with spring stop, the rear end of cylindrical body with
The front end of spring is carried out connected by spring stop.
Foil gauge is by the first foil gauge, the second foil gauge, third foil gauge, the 4th foil gauge, the 5th foil gauge, the 6th
Foil gauge, the 7th foil gauge and the 8th foil gauge composition, wherein the first foil gauge, the second foil gauge, third foil gauge, the 4th answering
Become piece be separated by 90 ° it is axially disposed, the 5th foil gauge, the 6th foil gauge, the 7th foil gauge, the 8th foil gauge be separated by 90 ° it is vertical
In axial arrangement, the first foil gauge and third foil gauge are connected on a bridge arm, the 5th foil gauge and the series connection of the 7th foil gauge
On a bridge arm, the 6th foil gauge and the 8th foil gauge are connected on a bridge arm, the second foil gauge, the series connection of the 4th foil gauge
On a bridge arm, four bridge arms are working arms, constitute full-bridge circuit.
On the one hand the conducting wire that data collection and control module is drawn uses the action signal of two conducting wires and pedal lower end to switch
It is connected, is on the other hand connected with four conducting wires with the full-bridge circuit that foil gauge forms, includes in data collection and control module
There are power supply, pedal travel analog controller, master control switch and protective resistance, power supply is directly full-bridge circuit power supply, full-bridge circuit
The voltage of output acts on pedal travel analog controller, and master control switch is located in the connection line of power supply and full-bridge circuit,
Protective resistance is located in the connection line of full-bridge circuit and pedal travel analog controller, the action signal switch of pedal lower end with
Pedal travel analog controller is in parallel, and quiet, the movable contact of action signal switch are respectively arranged on pedal support and support arm.
Provided by the present invention for the pedal travel measurement method of driving data acquisition system, include the following steps:
Step 1: carrying out calibration experiment in advance, determines the fitting function between output voltage and pedal travel；
Step 2: fitting function between output voltage and pedal travel is set in advance in pedal travel analog controller
In；
Step 3: when driver steps on pedal, corresponding signal is transferred to pedal travel simulation control by action signal switch
Device calculates pedal travel by the fitting function being arranged in pedal travel analog controller in advance.
The working principle of the invention:
When driver is sitting in cockpit, if driver steps on pedal, action signal switch passes corresponding actions signal
It is defeated by pedal travel analog controller, at the same time, the compression of the spring of cylindrical body rear end answers cylindrical body by corresponding pressure
Power, under the action of compression, the foil gauge for being pasted onto periphery generates deformation, corresponding full-bridge electricity together with cylindrical body
Road output voltage is sent into pedal travel analog controller.It is defeated according to pre-set full-bridge circuit in pedal travel analog controller
Corresponding relationship represented by fitting function between voltage and pedal travel out obtains corresponding pedal travel signal, so far, just
Obtain the stroke of pedal.
Heretofore described foil gauge, data collection and control module and action signal switch is the group of existing equipment
Dress, therefore, concrete model and specification do not have further progress to repeat.
Beneficial effects of the present invention:
Apparatus structure provided by the invention is simple, using being detachably connected between each component part, convenient for separation assembling with
Measuring error；Pedal tread is disposed with lightening hole, and loss of weight section material while also avoids the maloperation as caused by skidding；Do not make
With the accurate measurement for realizing pedal travel in the case where displacement sensor, the cost of measuring system is effectively reduced.This hair
The apparatus and method of bright offer are scientific research, teaching provides a kind of effective pedal travel for driving data acquisition system and surveys
Device and method is measured, also saves measurement cost while realizing that pedal travel accurately measures.
Detailed description of the invention
Fig. 1 is device overall structure diagram of the present invention.
Fig. 2 is device schematic cross-sectional view of the present invention.
Fig. 3 is heretofore described pedal structure schematic diagram.
Fig. 4 is heretofore described foil gauge arrangement schematic diagram.
Fig. 5 is each foil gauge connection relationship diagram in heretofore described full-bridge circuit.
Fig. 6 is heretofore described data collection and control inside modules structure and line connecting relation schematic diagram.
1, pedal 2, the first drive rod 3, the second drive rod 4, cylindrical body 5, foil gauge
6, data collection and control module 7, spring 8, fixed plate 9, bottom plate 10, action signal switch
11, support arm 12, pedal support 13, return spring 14, lightening hole 15, limiting bracket
16, sleeve 17, spring stop 20, the first foil gauge 21, the second foil gauge 22, third foil gauge
23, the 4th foil gauge 25, the 5th foil gauge 26, the 6th foil gauge 27, the 7th foil gauge
28, the 8th foil gauge 29, full-bridge circuit 30, power supply 31, pedal travel analog controller
32, master control switch 33, protective resistance.
Specific embodiment
It please refers to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6:
Pedal travel measuring device provided by the present invention for driving data acquisition system includes that pedal 1, first passes
Lever 2, the second drive rod 3, cylindrical body 4, foil gauge 5 and data acquisition and control module 6, wherein the first drive rod 2 is hinged on
The rear end of pedal 1, the rear end of the first drive rod 2 and the front end of the second drive rod 3 are hinged, and cylindrical body 4 is connected to the second transmission
The rear end of bar 3, foil gauge 5 are sticked on cylindrical body 4, and the rear end of cylindrical body 4 is connected with spring 7, and the rear end of spring 7 is fixed on
On fixed board 8, the assembly of pedal 1 and fixed plate 8 are respectively fixedly connected on bottom plate 9, data collection and control module 6 respectively with pedal 1
The action signal switch 10 of lower end is connected with foil gauge 5.
Pedal 1 is hinged on pedal support 12 under the support of two support arms 11, in the connecting shaft of two 11 lower ends of support arm
Equipped with return spring 13, several lightening holes 14 are offered on the surface of pedal 1, the shape of lightening hole 14 is regular hexagon, side length
For 4.6-5.2mm.
Second drive rod 3 is located on limiting bracket 15.
The spring 7 of 4 rear end of cylindrical body is plugged in a sleeve 16, and the front end of sleeve 16 is equipped with spring stop 17, cylindrical body 4
Rear end and spring 7 front end by spring stop 17 carry out it is connected.
Foil gauge 5 is answered by the first foil gauge 20, the second foil gauge 21, third foil gauge 22, the 4th foil gauge the 23, the 5th
Become piece 25, the 6th foil gauge 26, the 7th foil gauge 27 and the 8th foil gauge 28 composition, wherein the first foil gauge 20, second strains
Piece 21, third foil gauge 22, the 4th foil gauge 23 are separated by 90 ° of axially disposed, the 5th foil gauge 25, the 6th foil gauge 26,
Seven foil gauges 27, the 8th foil gauge 28 are separated by 90 ° perpendicular to axial arrangement, and the first foil gauge 20 and third foil gauge 22 are connected on
On one bridge arm, the 5th foil gauge 25 and the 7th foil gauge 27 are connected on a bridge arm, the 6th foil gauge 26 and the 8th strain
Piece 28 is connected on a bridge arm, and the second foil gauge 21, the 4th foil gauge 23 are connected on a bridge arm, and four bridge arms are works
Make arm, constitutes full-bridge circuit 29.
On the one hand the conducting wire that data collection and control module 6 is drawn is opened with two conducting wires and the action signal of 1 lower end of pedal
It closes 10 to be connected, be on the other hand connected with four conducting wires with the full-bridge circuit 29 that foil gauge 5 forms, data collection and control module
It include power supply 30, pedal travel analog controller 31, master control switch 32 and protective resistance 33 in 6, power supply 30 is directly full-bridge
Circuit 29 is powered, and the voltage that full-bridge circuit 29 exports acts on pedal travel analog controller 31, and master control switch 32 is located at electricity
In the connection line of source 30 and full-bridge circuit 29, protective resistance 33 is located at full-bridge circuit 29 and pedal travel analog controller 31
In connection line, the action signal switch 10 of 1 lower end of pedal is in parallel with pedal travel analog controller 31, action signal switch 10
Quiet, movable contact be respectively arranged on pedal support 12 and support arm 11.
Provided by the present invention for the pedal travel measurement method of driving data acquisition system, include the following steps:
Step 1: carrying out calibration experiment in advance, determines the fitting function between 1 stroke of output voltage and pedal；
Step 2: fitting function between 1 stroke of output voltage and pedal is set in advance in pedal travel analog controller
In 31；
Step 3: when driver steps on pedal 1, corresponding signal is transferred to pedal travel simulation control by action signal switch 10
Device 31 processed calculates pedal travel by the fitting function being arranged in pedal travel analog controller 31 in advance.
The working principle of the invention:
When driver is sitting in cockpit, if driver steps on pedal 1, action signal switch 10 is by corresponding actions signal
It is transferred to pedal travel analog controller 31, at the same time, the compression of the spring 7 of 4 rear end of cylindrical body makes cylindrical body 4 by corresponding
Compression, under the action of compression, the foil gauge 5 and cylindrical body 4 for being pasted onto periphery generate deformation together, accordingly
29 output voltage of full-bridge circuit be sent into pedal travel analog controller 31.According to being set in advance in pedal travel analog controller 31
Corresponding relationship represented by fitting function between 1 stroke of 29 output voltage of full-bridge circuit set and pedal, obtains corresponding step on
1 stroke signal of plate so far just obtains the stroke of pedal 1.
Heretofore described foil gauge 5, data collection and control module 6 and action signal switch 10 is existing equipment
Assembling, therefore, concrete model and specification do not have further progress to repeat.
Computing Principle in the method for the invention is as described below:
Each bridge arm initial resistance of full-bridge circuit 29 is equal, is all R0.Poisson's ratio is μ, then 29 output voltage of full-bridge circuit
Are as follows:
It can be seen that 29 output voltage size of full-bridge circuit and column type force measuring machine are because deformation size caused by stress exists
Corresponding relationship carries out rating test, obtains 29 output voltage of full-bridge circuit using voltmeter measurement using this corresponding relationship.
Experimental calibration obtains 29 output voltage u of m group full-bridge circuitkWith pedal travel ykData:
| Effectively calibration number k | 1 | 2 | … | m |
| Output voltage uk | u1 | u2 | … | um |
| Pedal travel yk | y1 | y2 | … | ym |
That is (uk, yk), k=1,2 ..., m.
It is fitted with least square method, that is, is intended to construct a n times formula:
Pn(u)=anun+…+a1u+a0
Seek parameters in series a0, a1..., an(n < m), makes:
Its minimum value is taken, so determining multinomial is exactly data (uk, yk), the least square fitting of k=1,2 ..., m are more
Item formula.
δ (a to be taken0, a1..., an) minimum value, Ying You:
That is:
Or it is write as:
Introduce mark:
Then have:
sja0+sj+1a1+…+sj+nan=uj(j=1,2 ..., n)
Here it is Pn(u) coefficient a0, a1..., anThe equation group of satisfaction, as 29 output voltage u of full-bridge circuit1, u2..., un
Mutual different time, equation group have unique solution a0, a1..., an, they makeIt is minimized.At this time just
29 output voltage u of full-bridge circuit is obtainedkWith pedal travel ykBetween fitting function Pn(u)。
29 output voltage u of full-bridge circuit is obtained by calibration experimentkWith pedal travel ykBetween fitting function Pn(u) it
Afterwards, by fitting function Pn(u) it is set in advance in pedal travel analog controller 31.Hereafter, to pedal travel analog controller
29 output voltage u of full-bridge circuit is sent into 31kAfterwards, pedal travel analog controller 31 is exportable corresponding pedal travel ykLetter
Number.
Claims (6)
1. a kind of pedal travel measuring device for driving data acquisition system, it is characterised in that: include pedal, the first biography
Lever, the second drive rod, cylindrical body, foil gauge and data acquisition and control module, wherein the first drive rod is hinged on pedal
Rear end, the rear end of the first drive rod and the front end of the second drive rod are hinged, and cylindrical body is connected to the rear end of the second drive rod, answer
Become piece be sticked on the cylinder, the rear end of cylindrical body is connected with spring, and the rear end of spring is fixed in fixed plate, pedal assembly with
Fixed plate is respectively fixedly connected on bottom plate, and data collection and control module switchs respectively with the action signal of pedal lower end and foil gauge
It is connected.
2. a kind of pedal travel measuring device for driving data acquisition system according to claim 1, feature exist
In: the pedal is hinged on pedal support under the support of two support arms, and the connecting shaft of two support arm lower ends is equipped with back
Position spring, several lightening holes are offered on the surface of pedal, and the shape of lightening hole is regular hexagon, side length 4.6-5.2mm.
3. a kind of pedal travel measuring device for driving data acquisition system according to claim 1, feature exist
In: second drive rod is located on limiting bracket.
4. a kind of pedal travel measuring device for driving data acquisition system according to claim 1, feature exist
In: the spring of the cylindrical body rear end is plugged in a sleeve, and the front end of sleeve is equipped with spring stop, the rear end of cylindrical body with
The front end of spring is carried out connected by spring stop.
5. a kind of pedal travel measuring device for driving data acquisition system according to claim 1, feature exist
In: the foil gauge is by the first foil gauge, the second foil gauge, third foil gauge, the 4th foil gauge, the 5th foil gauge,
Six foil gauges, the 7th foil gauge and the 8th foil gauge composition, wherein the first foil gauge, the second foil gauge, third foil gauge, the 4th
Foil gauge be separated by 90 ° it is axially disposed, the 5th foil gauge, the 6th foil gauge, the 7th foil gauge, the 8th foil gauge be separated by 90 ° hang down
It is directly connected on a bridge arm in axial arrangement, the first foil gauge and third foil gauge, the 5th foil gauge and the 7th foil gauge string
It is associated on a bridge arm, the 6th foil gauge and the 8th foil gauge are connected on a bridge arm, the second foil gauge, the 4th foil gauge string
It is associated on a bridge arm, four bridge arms are working arms, constitute full-bridge circuit.
6. a kind of pedal travel measuring device for driving data acquisition system according to claim 1, feature exist
In: on the one hand the conducting wire that the data collection and control module is drawn uses the action signal of two conducting wires and pedal lower end to switch
It is connected, is on the other hand connected with four conducting wires with the full-bridge circuit that foil gauge forms, includes in data collection and control module
There are power supply, pedal travel analog controller, master control switch and protective resistance, power supply is directly full-bridge circuit power supply, full-bridge circuit
The voltage of output acts on pedal travel analog controller, and master control switch is located in the connection line of power supply and full-bridge circuit,
Protective resistance is located in the connection line of full-bridge circuit and pedal travel analog controller, the action signal switch of pedal lower end with
Pedal travel analog controller is in parallel, and quiet, the movable contact of action signal switch are respectively arranged on pedal support and support arm.
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| CN108874024B (en) * | 2017-05-16 | 2023-12-26 | 上海朝辉压力仪器有限公司 | pedal control transmitter |
| CN107170346A (en) * | 2017-05-24 | 2017-09-15 | 李伟男 | A kind of braking pedal and sense simulator for driving simulator |
| CN107270807A (en) * | 2017-07-12 | 2017-10-20 | 杨志超 | A kind of vehicle brake footrest amplitude shows system |
| CN107600056B (en) * | 2017-09-20 | 2023-08-25 | 吉林大学 | Pedal feeling simulation and travel calculation device applied to driving simulator |
| CN107591053A (en) * | 2017-10-18 | 2018-01-16 | 吉林大学 | A kind of steering feel simulation and climb displacement device applied to driving simulator |
| CN108127561A (en) * | 2017-12-19 | 2018-06-08 | 苏州锃道研磨技术有限公司 | It is a kind of to power off the retainable absolute position measure and control device of data and its investigating method |
| CN109017722B (en) * | 2018-08-22 | 2022-03-18 | 中国北方车辆研究所 | Stroke limiting device for vehicle |
| CN110667543B (en) * | 2019-10-28 | 2021-04-13 | 吉林大学 | Brake pedal feeling simulation device and method for driving habit classification |
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| DE2942134A1 (en) * | 1979-10-18 | 1981-04-30 | Robert Bosch Gmbh, 7000 Stuttgart | EVALUATION FOR AN INDUCTIVE ENCODER |
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