CN105716878A - Automobile braking performance road tester and detection method thereof - Google Patents
Automobile braking performance road tester and detection method thereof Download PDFInfo
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- CN105716878A CN105716878A CN201610225960.7A CN201610225960A CN105716878A CN 105716878 A CN105716878 A CN 105716878A CN 201610225960 A CN201610225960 A CN 201610225960A CN 105716878 A CN105716878 A CN 105716878A
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Abstract
The invention discloses an automobile braking performance road tester and a detection method thereof. The system comprises a host A and a wireless terminal B capable of carrying out information transmission with the host; the wireless terminal B comprises a terminal data processing module, a terminal wireless transmission module connected with the terminal data processing module and an output unit connected with the terminal data processing module, wherein the terminal data processing module is also connected with a contact switch; the host comprises a host data processing module, a ranging module connected with the host data processing module and a host wireless transmission module connected with the host data processing module, and the host is arranged on the measuring position and performs information transmission with the wireless terminal. The advantages are that: the device is quick to install and convenient to use, the detection efficiency is improved, and the device is very convenient to use; the detection sensitivity and the detection precision are high; the information transmission is timely and accurate, and the detection precision is further ensured; the detection parameters are calibrated in a traceable manner, so that the long-term use accuracy is ensured, and the detection data is reliably ensured.
Description
Technical field
The present invention relates to a kind of instrument for checking automobile brake perfrmance, specifically a kind of automobile braking performance energy circuit adopting actual road test mode to check automobile brake perfrmance examination instrument and detection method thereof.
Background technology
GB GB7258-2012 " motor vehicles safe and technical specification " (hereinafter referred to as GB) 7.10 specifies, the mode of You Liangzhong road examination inspection automobile brake perfrmance, a kind of is check braking ability with the braking distance of Instrument measuring automobile, it is exactly automobile is accelerated to more than after the initial velocity V0 of national regulations, allow automobile neutral position sliding slow down, suddenly step on braking when decelerating to V0 and make automobile stop.Step on the distance braked when automobile stops with Instrument measuring from automobile emergency, be automobile brake distance.The average retardation rate that the second fully sends when being with Instrument measuring automobile brake checks the braking ability of automobile, it is simply that when automobile accelerates to the initial velocity V0 more than national regulations, allows automobile neutral position sliding slow down, and suddenly steps on braking and make automobile stop when decelerating to V0.Average retardation rate (MFDD) computing formula that national regulations fully sends is:
In formula:
The average retardation rate that MFDD fully sends, unit is m/s^2;
V0 car braking initial velocity, unit is km/h；
Vb 0.8V0 car speed, unit km/h；
Ve 0.1V0 car speed, unit km/h；
The Sb distance that vehicle crosses when speed drops to Vb, unit m；
The Se distance that vehicle crosses when speed drops to Ve, unit m.So (Se-Sb) be exactly car speed from Vb drop to Ve time the distance that crosses of automobile.
MFDD value is obtained with calculating after Instrument measuring Vb, Ve, Sb, Se.
Being currently used for road examination mode checks the road examination instrument of automobile brake perfrmance to be divided three classes, i.e. fifth wheel instrument, non-contact fifth wheel instrument and portable road examination instrument.
Fifth wheel instrument, refers to and takes turns additional one the 5th of automobile four wheels, it is simply that by modes such as screw clampings, one wheel is fixed on automobile rear, with the traveling of automobile, stopping synchronous follow-up.It is arranged on the 5th grating sensor taken turns and predicts travel speed and the distance of automobile, thus detecting the braking ability of automobile.Its shortcoming: one is take turns the 5th that to be arranged on automobile tail comparatively laborious, when particularly many automobiles being tested, it is necessary to frequently dismount, affects detection efficiency；Two is to installing and the 5th taking turns air pressure and there are certain requirements, because the 5th takes turns the pressure to ground and the 5th air pressure taken turns all can have influence on the 5th girth taken turns, thus having influence on accuracy of detection；Three is the 5th take turns the pressure on ground and not only to be limited by the impact of mounting and adjusting, also suffers from impact that is that automobile vehicle body when braking in detection process leans forward and that beat, and this all strengthens the error of detection data.
Non-contact fifth wheel instrument, its core component is a non-contact vehicle speed sensor, is arranged on vehicle body and adjusts its vertical irradiation ground, and optical sensor receives ground return light and produces speed voltage analog signal, processes the digital quantity obtaining speed then through modulus.The operating range of accekeration and automobile is calculated by the velocity variations of unit interval.Its shortcoming: one is owing to non-contact fifth wheel instrument is that the change according to ground image measures speed, sensor is installed and ground there are certain requirements, when the situation that the impacts such as ground the occurrence of wetness, spot are reflective, or all can there is the phenomenon that automobile's instant velocity does not detect in the situations such as automobile high-speed is anxious when stepping on braking, and leaning forward occurs in vehicle body, beat, affect accuracy of detection and even detect inefficacy, thus not widely used by vehicle inspection and test station.
Portable road examination instrument, all more convenient relative to carrying and install and use fifth wheel instrument.Its core component is an acceleration transducer, by measuring the accekeration of automobile and acceleration duration calculates travel speed and the operating range of automobile, then calculates and fully sends average retardation rate MFDD value.Although its accuracy of detection is not as fifth wheel instrument and non-contact fifth wheel instrument, but it is installed and used and compares that the above two are more convenient, obtains commonly used at the measuring station that routine vehicle detection limit is bigger.
It is pointed out that the portable road being widely used at present examination instrument there is also following substantially not enough:
1, accuracy of detection not high (being affected bigger by uncertain factor)
Portable road examination instrument detection error is primarily present in: one is the error that detection method causes, the core component of portable road examination instrument is an acceleration transducer, its detection is pickup, do not detect four parameter values of Vb, Ve, Sb, Se in national regulations formula, these four parameters and initial velocity V0 value, be all logical acceleration and acceleration time reckoning out, then go out MFDD result by four reckonings parameter value calculation out.Data is had to show the MFDD numerical error about-2.1% calculated；V0 error about 4.1%；Braking distance error about-7.3%, these are the errors of accumulation in calculating, and its actually detected error in data will be bigger.Two is the error that anthropic factor causes, mainly the installation of acceleration transducer must with axially the matching of vehicle traveling direction, even if conscientiously install and ensure that axial coincideing every time, but vehicle body all can lean forward when suddenly stepping on braking, also and then lose level causes axially producing angle with vehicle heading to sensor so that accekeration produces component and error occurs；Next to that initial velocity V0 during national regulations motor road test, portable road examination instrument can not directly measure current car speed, therefore the coroner of reality Road examination is the speedometer directly seeing automobile itself, suddenly braking is stepped on, thus detecting the braking ability of automobile when reaching the initial velocity V0 of regulation.It is to be understood that the speedometer of automobile itself is not instrument, can not as detect its braking ability time foundation.
2, the daily demarcation of instrument and calibration difficulties
Owing to which employs acceleration transducer, there is presently no fairly simple mode to measure acceleration error, therefore common user can not the precision of inspection apparatus being calibrated voluntarily, it is possible to there will be the situation removing detection automobile brake perfrmance with the instrument of misalignment.Even the accekeration that portable road examination instrument also only can be traced to the source by the China Metrology Accreditation of specialty is demarcated, travel speed and braking distance are value of calculation, cannot function as the calibrating parameters of China Metrology Accreditation, it is seen that actually detected parameter creates disconnection with the calibrating parameters that can trace to the source.Strictly speaking, trying the instrument standard according to the average retardation rate fully sent with portable road, the braking ability checking automobile is not an appropriate selection.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of not only easy to install quick and that can directly detect automobile operating range and speed, demarcates calibrating mode intuitively simple automobile braking performance energy circuit examination instrument and detection method thereof simultaneously.
In order to solve above-mentioned technical problem, the automobile braking performance energy circuit of present invention examination instrument, including host A and with main frame, the wireless terminal B of information transmission can be carried out；Wireless terminal B includes the terminal data processing module that can carry out information processing, the terminal wireless transport module being used for transmitting wireless signal being connected with terminal data processing module and the output unit for information is exported being connected with terminal data processing module, terminal data processing module is also connected with a contact switch can being connected on automobile brake pedal；Host A includes host data processing module, the range finder module being used for measuring vehicle operating range being connected with host data processing module and the main frame wireless transport module for transmitting wireless signal being connected with host data processing module, host A is placed on measurement position and carries out information exchange transmission with wireless terminal B.
Described host data processing module is also associated with data memory module.
Described host data processing module is also associated with printout module.
Described output unit is display unit or/and voice output unit.
Described voice output unit is stereo set.
Described display unit is display screen.
Described range finder module is ultrasound wave, electromagnetic wave or laser sensor.
The detection method of a kind of automobile braking performance energy circuit examination instrument, comprises the following steps:
A, host A fixed support or mobile spider are arranged on the centrage D of road examination runway E section start；
B, the signal emission port adjusted in host A are parallel with road examination runway E centrage D, adjust the height of signal emission port simultaneously and keep level can be pointed into being verified automobile C；
C, detection automobile brake perfrmance detection person vehicle information data is input in host A, and portable radio terminal B drives and is verified automobile C and enters from F and detect track E pause at original position G place；
D, being connected on automobile brake pedal by the contact switch being connected in wireless terminal B, when trampling brake pedal, contact switch is connected, and is used for gathering the signal trampling automobile brake pedal；
E, with the long-range active host A of wireless terminal B, host A starts to measure host A to the distance being verified automobile C with range finder module high frequency time；
F, coroner's driving are verified automobile C and accelerate to more than separating clutch art skating after initial velocity V0, in this process, host A goes out the instantaneous velocity of automobile C by the distance change calculations in the unit interval, and velocity amplitude is passed in wireless terminal B in real time, wireless terminal B point out coroner's current vehicle speed；
G, when speed slides and drops to initial velocity V0, coroner is anxious steps on braking until automobile stops, while suddenly stepping on brake pedal, contact switch is connected, switch connection signal is sent on host A rapidly by wireless terminal B, in this process, motor road test instrument host A high frequency time all the time detects and records time t value, speed V-value, distance S value；
H, coroner suddenly step on brake pedal contact switch and connect generation t0, corresponding car speed now is V0, the value of Ve and Vb is obtained according to Ve=0.1V0 and Vb=0.8V0, distance during corresponding car speed Ve and Vb is exactly the Sb value of Se, in like manner, distance when corresponding car speed V0 and automobile stop is S0 and Sp value respectively.
It is an advantage of the current invention that:
1 compared with fifth wheel instrument, non-contact fifth wheel instrument, portable road examination instrument, it is fixed and is arranged on the end of road examination runway, once it is adjusted in place and many automobile brake perfrmances can be detected, avoid the trouble of repeated disassembled and assembled between detected automobile, it is very convenient to install and use, and improves detection efficiency.Also because not being associated with automobile itself, it is to avoid installation sensor is lack of standardization, not in place, or automobile because of brake hard, vehicle body leans forward, the reason such as beat strengthens the error of detection data；
2 compared with non-contact fifth wheel instrument, this instrument adopts ultrasound wave, electromagnetic wave, laser sensor directly to measure automobile driving speed and distance, moist, the spot by external environment such as ground, what automobile brake caused lean forward, factor of beating impact is little, and accuracy of detection is easier to ensure or precision is affected little by uncertain factor；
3 compared with fifth wheel instrument, non-contact fifth wheel instrument, portable road examination instrument, and speed is passed to wireless terminal B prompting coroner by this instrument in real time, performs the inspection initial velocity V0 of the national regulations foundation requiring offer definite for coroner.
4 compared with non-contact fifth wheel instrument, portable road examination instrument, this instrument directly measures dynamically travelling from obtaining assay of automobile, detection parameter and calibrating parameters are consistent, as long as the precision of the range finding long chi of standard can be carried out current check calibration, directly perceived simple, the carrying out just can detection parameter can traced to the source very easily is demarcated, it is ensured that its precision used for a long time.Avoid as non-contact fifth wheel instrument, portable road examination instrument detection parameter and calibrating parameters inconsistent, thus the situation that detection parameter can not be traced to the source occurs, what such as examination instrument in portable road was demarcated is accekeration, what detect is but the operating range of automobile, not only detection parameter can not be traced to the source, also create in conversion process simultaneously unnecessary, be also the calculating cumulative error can not ignore.
Accompanying drawing explanation
Fig. 1 is the theory structure schematic diagram of automobile braking performance energy circuit of the present invention examination instrument；
Fig. 2 is the use view of automobile braking performance energy circuit of the present invention examination instrument；
Fig. 3 is test entity relationship diagram in automobile braking performance energy circuit of the present invention examination instrument.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the automobile braking performance energy circuit of the present invention is tried instrument and detection method is described in further detail.
As it can be seen, the automobile braking performance energy circuit examination instrument of the present invention, including host A and with main frame, the wireless terminal B of information transmission can be carried out；Wireless terminal B includes the terminal data processing module that can carry out process information, the terminal wireless transport module being used for transmitting wireless signal being connected with terminal data processing module and the output unit for information is exported being connected with terminal data processing module, described output unit is display unit or/and voice output unit, described voice output unit can be stereo set, described display unit can be display screen, and wireless terminal B is also connected with a contact switch can being connected on automobile brake pedal；Host A includes host data processing module, the range finder module being used for measuring spacing being connected with host data processing module and the main frame wireless transport module for transmitting wireless signal being connected with host data processing module, host data processes and is also associated with printout module in memory module；Host A is placed on measurement position and carries out information exchange transmission with wireless terminal B.
Described range finder module is ultrasound wave, electromagnetic wave or laser sensor, from there through modes such as ultrasound wave, electromagnetic wave, laser, directly measures automobile driving speed and distance, as the parameter that fifth wheel instrument measures, it is ensured that the precision of detection；During use, it is fixed and is arranged on the end of road examination runway, once it is adjusted in place, avoid fifth wheel instrument, portable road examination instrument and non-contact fifth wheel instrument will between detected automobile the trouble of repeated disassembled and assembled, it also avoid install not in place or automobile because of braking vehicle body lean forward, the error produced of beating, it is very convenient to use.
The detection method of a kind of above-mentioned automobile braking performance energy circuit examination instrument, comprises the following steps:
A, host A fixed support or mobile spider are arranged on the centrage D of road examination runway E section start (can be regulated height and position and the level angle of host A by support)；
B, the signal emission port adjusted in host A are parallel with road examination runway E centrage D, adjust the height of signal emission port simultaneously and keep level can be pointed into being verified automobile C；
C, detection automobile brake perfrmance detection person vehicle information data is input in host A, and portable radio terminal B drives and is verified automobile C and enters from F and detect track E pause at original position G place；
D, being connected on automobile brake pedal by the contact switch being connected in wireless terminal B, when trampling brake pedal, contact switch is connected, and is used for gathering the signal trampling automobile brake pedal；
E, with the long-range active host A of wireless terminal B, host A starts to measure host A to the distance being verified automobile C with range finder module high frequency time；
F, coroner's driving are verified automobile C and accelerate to more than separating clutch art skating after initial velocity V0, in this process, host A goes out the instantaneous velocity of automobile C by the distance change calculations in the unit interval, and velocity amplitude is passed in wireless terminal B in real time, wireless terminal B point out coroner's current vehicle speed；
G, when speed slides and drops to initial velocity V0, coroner is anxious steps on braking until automobile stops, while suddenly stepping on brake pedal, contact switch is connected, switch connection signal is sent on host A rapidly by wireless terminal B, in this process, motor road test instrument host A high frequency time all the time detects and records time t value, speed V-value, distance S value；
H, coroner suddenly step on brake pedal contact switch and connect generation t0, corresponding car speed now is V0, the value of Ve and Vb is obtained according to Ve=0.1V0 and Vb=0.8V0, distance during corresponding car speed Ve and Vb is exactly the Sb value of Se, in like manner, distance when corresponding car speed V0 and automobile stop is S0 and Sp value respectively.
Its concrete Cleaning Principle is as follows:
The present invention preferentially uses a laser to measure distance and the speed of running car, during use, as shown in Figure 2, host A fixed support or mobile spider are arranged on the centrage D of road examination runway E section start, adjust the laser beam in host A parallel with road examination runway E centrage D, adjusting laser beam to certain altitude level simultaneously, can be pointed into being verified automobile C, high frequency time detection host A is to the distance between automobile C；Wireless terminal B is held by the driver's (hereinafter referred to as detection person) detecting automobile brake perfrmance, and it is wirelessly connected with host A；One contact switch of grafting in wireless terminal B, contact switch can be connected on automobile brake pedal eaily, and when trampling brake pedal, contact switch is connected, and is used for gathering coroner and tramples the signal of automobile brake pedal.
During practice examining, the information such as the number-plate number, type of vehicle is inputted road examination instrument by coroner, portable radio terminal B driving is verified automobile C F from Fig. 2 and enters detection track E and pause at original position G place, brake pedal contact switch is connected on brake pedal, then with the long-range active host A of wireless terminal B, host A starts with the mensuration host A of laser beam high frequency time to the distance being verified automobile C, gone out the instantaneous velocity of automobile C by the distance change calculations in the unit interval, and velocity amplitude is passed in wireless terminal B in real time.Coroner's driving is verified automobile C and accelerates to more than separating clutch art skating after initial velocity V0, in this process, wireless terminal B can point out coroner current vehicle speed by the mode such as numerical monitor and sound, when speed slides and drops to initial velocity V0, coroner is anxious steps on braking until automobile stops, while suddenly stepping on brake pedal, contact switch is connected, switch connection signal is sent on host A rapidly by wireless terminal B, informs that braking has begun to.In this process, motor road test instrument host A high frequency time all the time detects and records time t value, speed V-value, distance S value, and their relation is as shown in Figure 3.Coroner suddenly steps on brake pedal contact switch and connects generation t0, corresponding car speed now is the initial velocity angle value of V0(national regulations), obtain the value of Ve and Vb according to Ve=0.1V0 and Vb=0.8V0, during corresponding car speed Ve and Vb, host A is exactly the value of Se and Sb to the distance being verified automobile C.In like manner, distance when corresponding car speed V0 and automobile stop is S0 and Sp value respectively.
More than detect the utilization of the data obtained:
1, the braking distance of automobile, it is simply that coroner suddenly step on brake pedal to automobile stop time the garage distance that crosses, the distance of namely S0 to Sp, deducts, with Sp, the braking distance that S0 is exactly automobile as can be seen from Figure 3, meet Standard for qualified.
2, the average retardation rate MFDD that automobile brake fully sends, it is simply that the formula that Vb, Ve, Sb, Se substitute into national regulations is obtained MFDD value, what meet national regulations is qualified.
3, the brake coordination time of automobile, the national regulations brake coordination time is the duration step on from urgency and reach MFDD when brake pedal starts to braking deceleration 75%.The braking deceleration computing formula of automobile is a=V/t, and in formula, a is automobile brake deceleration, tries the 75% of the MFDD that instrument records equal to road, is known quantity；V and t is two variablees having functional relationship as seen from Figure 3, and their functional relationship has road examination a succession of V-value of recording of instrument and t value to try to achieve.When meeting formula a=V/t condition, the duration between tx, t0 to tx in t value now i.e. Fig. 3 is exactly the brake coordination time.
4, car speed and braking distance curve chart are drawn, all car speed V-value of detecting with high frequency time, operating range S value, braking duration t value, draw out more accurate automobile brake perfrmance curve chart, figure is similar to V, S line chart in Fig. 3, compares the braking ability of the reflection automobile of visual pattern.
The printing of automobile brake perfrmance survey report:
When speed drops to zero, illustrating that vehicle stops showing test ending, host A can be respectively adopted the average retardation rate MFDD fully sent or two methods of braking distance to judge the braking ability of automobile.
No matter testing result how, coroner selects print or do not print survey report such as through wireless terminal B, the insensitivity of automobile to be done a judgement by coroner before selecting printed report, when body of a motor car tries the national regulations sideline, both sides of runway E it may determine that the insensitivity of automobile meets Standard without departing from road after suddenly stepping on braking, host A prints braking ability survey report according to the instruction of coroner.
Host A can store testing data, testing data also can be sent to the computer of vehicle inspection and test station by wired or wireless mode, preserve together with data such as light performance, the chassis performance etc. detected with other station being verified automobile C, provided to detected automobile by the computer of vehicle inspection and test station to include the more comprehensively comprehensive detection report such as chassis performance, light performance, ensure that the integrity of vehicle inspection and test station car data detection simultaneously.
Claims (8)
1. automobile braking performance energy circuit examination instrument, it is characterised in that: include host A and the wireless terminal B of information transmission can be carried out with main frame；Described wireless terminal B includes the terminal data processing module that can carry out information processing, the terminal wireless transport module being used for transmitting wireless signal being connected with terminal data processing module and the output unit for information is exported being connected with terminal data processing module, described wireless terminal B is also connected with a contact switch can being connected on automobile brake pedal；Described host A includes host data processing module, the range finder module being used for measuring vehicle operating range being connected with host data processing module and the main frame wireless transport module for transmitting wireless signal being connected with host data processing module, described host A is placed on measurement position and carries out information exchange transmission with wireless terminal.
2. the automobile braking performance energy circuit examination instrument described in claim 1, it is characterised in that: described host data processing module is also associated with data memory module.
3. the automobile braking performance energy circuit examination instrument described in claim 1 or 2, it is characterised in that: described host data processing module is also associated with printout module.
4. the automobile braking performance energy circuit examination instrument described in claim 1, it is characterised in that: described output unit is display unit or/and voice output unit.
5. the automobile braking performance energy circuit examination instrument described in claim 4, it is characterised in that: described voice output unit is stereo set.
6. the automobile braking performance energy circuit examination instrument described in claim 4, it is characterised in that: described display unit is display screen.
7. the automobile braking performance energy circuit examination instrument described in claim 1, it is characterised in that: described range finder module is ultrasound wave, electromagnetic wave or laser sensor.
8. the detection method of automobile braking performance energy circuit examination instrument as described in one of claim 1-7, it is characterised in that comprise the following steps:
A, host A fixed support or mobile spider are arranged on the centrage D of road examination runway E section start；
B, the signal emission port adjusted in host A are parallel with road examination runway E centrage D, adjust the height of signal emission port simultaneously and keep level can be pointed into being verified automobile C；
C, detection automobile brake perfrmance detection person vehicle information data is input in host A, and portable radio terminal B drives and is verified automobile C and enters from F and detect track E pause at original position G place；
D, being connected on automobile brake pedal by the contact switch being connected in wireless terminal B, when trampling brake pedal, contact switch is connected, and is used for gathering the signal trampling automobile brake pedal；
E, with the long-range active host A of wireless terminal B, host A starts to measure host A to the distance being verified automobile C with range finder module high frequency time；
F, coroner's driving are verified automobile C and accelerate to more than separating clutch art skating after initial velocity V0, in this process, host A goes out the instantaneous velocity of automobile C by the distance change calculations in the unit interval, and velocity amplitude is passed in wireless terminal B in real time, wireless terminal B point out coroner's current vehicle speed；
G, when speed slides and drops to initial velocity V0, coroner is anxious steps on braking until automobile stops, while suddenly stepping on brake pedal, contact switch is connected, switch connection signal is sent on host A rapidly by wireless terminal B, in this process, motor road test instrument host A high frequency time all the time detects and records time t value, speed V-value, distance S value；
H, coroner suddenly step on brake pedal contact switch and connect generation t0, corresponding car speed now is V0, the value of Ve and Vb is obtained according to Ve=0.1V0 and Vb=0.8V0, distance during corresponding car speed Ve and Vb is exactly the Sb value of Se, in like manner, distance when corresponding car speed V0 and automobile stop is S0 and Sp value respectively.
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| CN114274183A (en) * | 2021-11-22 | 2022-04-05 | 深圳优地科技有限公司 | Brake performance test system and method and test controller |
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| CN114274183A (en) * | 2021-11-22 | 2022-04-05 | 深圳优地科技有限公司 | Brake performance test system and method and test controller |
| CN114274183B (en) * | 2021-11-22 | 2024-01-30 | 深圳优地科技有限公司 | Brake performance test system, method and test controller |
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Application publication date: 20160629 |