CN107554529A - A kind of speed of commercial car calculates method and system - Google Patents
A kind of speed of commercial car calculates method and system Download PDFInfo
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- CN107554529A CN107554529A CN201710734909.3A CN201710734909A CN107554529A CN 107554529 A CN107554529 A CN 107554529A CN 201710734909 A CN201710734909 A CN 201710734909A CN 107554529 A CN107554529 A CN 107554529A
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Abstract
The invention discloses a kind of speed of commercial car to calculate method and system, and this method includes：Obtain the distance between shaft center and ground and be used as tire radius, due to being to effectively improve the degree of accuracy of tire radius as tire radius using the distance between the shaft center of reality and ground as tire radius, rather than using preset value；Then obtain vehicle and convert into driving wheel speed per minute as tire rotational speed, and according to the tire radius and tire rotational speed acquisition speed.Speed computational methods provided by the invention are without using parameters such as traditional rear-end ratio, gearbox mileometer speed ratios, thus a variety of instrument need not be equipped with for commercial car to adapt to be used for rear-end ratio, gearbox mileometer speed ratio corresponding to different loading capacity, it enormously simplify numerous and diverse degree of production assembling, and because tire radius and tire rotational speed are the actual value of Current vehicle so that result of calculation is more accurate.
Description
Technical field
The present invention relates to automobile technical field, the speed of more particularly to a kind of commercial car calculates method and system.
Background technology
Vehicle is provided with speedometer, for the instruction of vehicle speed of operation, in order to which human pilot grasps speed of operation, and
Control speed of operation.
Speedometer by the vehicle speed sensor on the worm screw of the gearbox Worm-gear assembly of wheel, microprocessor system and
Display forms, the photoimpact or magnetoelectricity pulse signal sent by vehicle speed sensor, the microprocessor system through gauge internal
After processing, speed is shown on a display screen.Microprocessor system needs to calculate every kilometer of tire rotational speed, wherein, every kilometer of wheel
Tire rotating speed=rear-end ratio × 1000/ (2 × π × tire radius × gearbox mileometer speed ratio), rear-end ratio, change
Fast case mileometer speed is default fixed value than, tire radius, then calculates speed according to every kilometer of tire rotational speed, for example,
Kilometer sensor acquisition pulse number × 12 × 60/ (every to turn umber of pulse × every kilometer of tire rotational speed), i.e. basis in speed=5 second
The ratio of umber of pulse and every kilometer of tire rotational speed obtains speed (Km/h) per hour.
However, the loading capacity of commercial car is much greater compared with home vehicle and load distribution scope is wider, cause bridge base ratio,
The excursion of gearbox mileometer speed ratio is larger, when rear-end ratio, gearbox mileometer speed are than changing, just needs
Increase the speed of instrument than state, so that the species increase of instrument, causes production line production assembling cumbersome.
In addition, in order to meet Standard：Instrument instruction speed have to be larger than actual vehicle speed when speedometer matches, that is, need
Vehicle all meets in unloaded, full load：Instrument instruction speed is more than actual vehicle speed when speedometer matches, therefore causes speedometer not
Accurately, for example, vehicle tire radius in zero load are 0.52m, instrument instruction speed is 80Km/h, actual vehicle speed 79.8Km/
H, now instrument instruction speed and actual vehicle speed are basically identical, but with reasons such as vehicle load increases, tire radius are by gravity
0.46m is compressed to, now instrument instruction speed is 80Km/h, but actual vehicle speed is 70.6Km/h, causes actual vehicle speed much small
Speed is indicated in instrument, now instrument instruction speed has big difference with actual vehicle speed.Simultaneously because vehicle accumulated distance is by speed
× the time determines, so as to cause mileometer accumulated distance seriously inaccurate, can have influence on fuel consumption gauge of vehicle, driving recording indirectly again
Instrument, engine etc. need the degree of accuracy of the correlation computations of the part of speed information.
The content of the invention
The invention provides a kind of speed of commercial car to calculate method and system, solves the speed acquisition modes of prior art
The problem of requirement of commercial car can not be met.
The invention provides a kind of speed computational methods of commercial car, including：
Obtain the distance between shaft center and ground and be used as tire radius；
Obtain vehicle and convert into driving wheel speed per minute as tire rotational speed；
Speed is obtained according to the tire radius and tire rotational speed.
Preferably, methods described also includes：
The distance between shaft center and ground are used as initial tire radius when obtaining stationary vehicle；
The acquisition shaft center includes with the distance between ground conduct tire radius：
The distance between center and ground of multiple diverse locations of drive shaft are obtained respectively as alternative tire radius；
Whether the difference calculated between maximum alternative tire radius and minimum alternative tire radius exceedes given threshold, if
It is, then using initial tire radius as present tire radius, if it is not, then using the average value of each alternative tire radius as currently
Tire radius.
Preferably, methods described also includes：
The comparison table of demarcation tire pressure and tire radius in advance；
Tire pressure is monitored while the tire radius are obtained；
The tire radius are modified according to the comparison table of current tire pressure and the tire pressure and tire radius, obtained
To the first amendment tire radius；
It is described to be included according to the tire radius and tire rotational speed acquisition speed：
Speed is obtained according to the first amendment tire radius and tire rotational speed.
Preferably, methods described also includes：
The comparison table of demarcation load-carrying and tire radius in advance；
Load-carrying is monitored while the tire radius are obtained；
The tire radius are modified according to the comparison table of live load and the load-carrying and tire radius, obtained
To the second amendment tire radius；
It is described to be included according to the tire radius and tire rotational speed acquisition speed：
Speed is obtained according to the second amendment tire radius and tire rotational speed.
Preferably, methods described also includes：
The comparison table of demarcation load-carrying and tire radius in advance；
Load-carrying is monitored while the first amendment tire radius are obtained；
The described first amendment tire radius are entered according to the comparison table of live load and the load-carrying and tire radius
Row amendment, obtain the 3rd amendment tire radius；
It is described to be included according to the first amendment tire radius and tire rotational speed acquisition speed：
Speed is obtained according to the 3rd amendment tire radius and tire rotational speed.
Preferably, methods described also includes：
After speed is obtained, VMT Vehicle-Miles of Travel is obtained according to the speed.
Correspondingly, present invention also offers a kind of speed computing system of commercial car, including：
Combination instrument, radar, anti-blocking brake system and power supply, the power supply give the combination instrument and the braking
Anti-lock braking system is powered, and the anti-blocking brake system is connected by CAN with the combination instrument, the radar with it is described
Combination instrument is connected；
The radar is used to gather the distance between shaft center and ground, and is sent to the combination instrument；
The anti-blocking brake system is used to that driving wheel rotary speed information per minute will to be converted into comprising vehicle by CAN
Message is sent to the combination instrument；
The combination instrument is used for using the distance between the shaft center of reception and ground as tire radius, will receive
Vehicle convert into it is per minute driving wheel speed be used as tire rotational speed, then according to the tire radius and the tire rotational speed calculating
Speed, and shown.
Preferably, the radar totally three, the left end, right-hand member and centre position of drive shaft are separately positioned on, for gathering
The distance between the left end of drive shaft, right-hand member and the center in centre position and ground, as each alternative tire radius；
The system also includes：
The parking brake switch being connected with the combination instrument, for sending parking brake signal to the combination instrument；And
The service brake switch being connected with the combination instrument, for sending service brake signal to the combination instrument；
The combination instrument is used to receive parking brake signal and/or service brake signal, tire rotational speed zero and maximum alternatively
When the difference of tire radius and minimum alternative tire radius is less than given threshold, using the average of each alternative tire radius as initial wheel
Tire radius；When not receiving parking brake signal and/or service brake signal, maximum alternative tire radius and minimum alternative tire half are calculated
Whether the difference between footpath exceedes given threshold, if it is, using initial tire radius as present tire radius, if not,
Present tire radius is then used as using the average value of each alternative tire radius.
Preferably, the system also includes：
The tire pressure monitoring controller being connected by CAN with the combination instrument, for being sent to the combination instrument
Message comprising tire pressure；
The combination instrument is used for the comparison table for storing tire pressure and tire radius, the basis after tire pressure is received
Current tire pressure and the comparison table of the tire pressure and tire radius are modified to the tire radius, obtain the first amendment wheel
Tire radius, then obtain speed according to the first amendment tire radius and tire rotational speed.
Preferably, the system also includes：
The sense set sensor being connected with the combination instrument, for gathering vehicle load information, and it is sent to the combination
Instrument；
The combination instrument is used for the comparison table for storing load-carrying and tire radius, after vehicle load information is received
The tire radius are modified according to the comparison table of live load and the load-carrying and tire radius, second is obtained and repaiies
Positive tire radius, then obtain speed according to the second amendment tire radius and tire rotational speed.
A kind of speed of commercial car provided by the invention calculates method and system, including：Obtain shaft center and ground
The distance between be used as tire radius, due to be using the shaft center of reality and the distance between ground as tire radius,
Rather than the degree of accuracy of tire radius is effectively improved as tire radius using preset value；Then obtain vehicle and convert into every point
Clock drives wheel speed as tire rotational speed, and obtains speed according to the tire radius and tire rotational speed.Car provided by the invention
Fast computational methods need not be commercial car without using parameters such as traditional rear-end ratio, gearbox mileometer speed ratios
A variety of instrument are equipped with to adapt to be used for rear-end ratio, gearbox mileometer speed ratio corresponding to different loading capacity, are greatly simplified
Numerous and diverse degree of production assembling, and because tire radius and tire rotational speed are the actual value of Current vehicle so that result of calculation
It is more accurate.
Further, the speed of commercial car provided in an embodiment of the present invention calculates method and system, obtains stationary vehicle shape
Initial tire radius under state, then obtain multiple diverse locations of drive shaft center and the distance between ground respectively as
Alternative tire radius, and whether the difference calculated between maximum alternative tire radius and minimum alternative tire radius exceedes setting threshold
Value, if it is, using initial tire radius as present tire radius, if it is not, then the average value with each alternative tire radius
As present tire radius.So effectively avoid because road surface has the tire that the reasons such as obstacle, surface evenness be low cause to obtain
The inaccurate situation of radius occurs：When tire radius data meet to require using latest data as present tire radius, taking turns
When tire radius data is unsatisfactory for requiring, using the nearest initial tire radius for meeting to require as present tire radius, it can ensure and obtain
The degree of accuracy of the speed taken.In addition, tire radius of the vehicle under static and motion state can also change, so obtain in real time
The tire radius taken are more accurate.
Further, commercial car provided in an embodiment of the present invention speed calculate method and system, in advance demarcate tire pressure with
The comparison table of tire radius, tire radius are repaiied according to the comparison table of current tire pressure and tire pressure and tire radius
Just, the tire radius for so effectively improving acquisition are more accurate.
Further, commercial car provided in an embodiment of the present invention speed calculate method and system, in advance demarcate load-carrying with
The comparison table of tire radius, according to the comparison table of live load and the load-carrying and tire radius to the tire half
Footpath is modified, and the tire radius for so effectively improving acquisition are more accurate.
Brief description of the drawings
, below will be to institute in embodiment in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only one described in the present invention
A little embodiments, for those of ordinary skill in the art, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the first flow chart according to the speed computational methods of commercial car provided in an embodiment of the present invention；
Fig. 2 is second of flow chart according to the speed computational methods of commercial car provided in an embodiment of the present invention；
Fig. 3 is the third flow chart according to the speed computational methods of commercial car provided in an embodiment of the present invention；
Fig. 4 is the first structural representation according to the speed computing system of commercial car provided in an embodiment of the present invention；
Fig. 5 is second of structural representation according to the speed computing system of commercial car provided in an embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar parameter or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
A kind of speed of commercial car provided by the invention calculates method and system, by obtaining vehicle present tire radius,
And speed is obtained according to the tire radius and the tire rotational speed obtained in real time, because above- mentioned information is all current data, rather than
The preset value of use so that the data of acquisition are more accurate.In addition, the main deceleration of back axle need not be used during speed is calculated
Than, gearbox mileometer speed than etc. data, thus without according to different rear-end ratios, gearbox mileometer speed than preparing
Corresponding speedometer, only can meet the needs of all commercial car with a kind of speedometer provided by the invention, greatly reduce life
The cumbersome degree of producing line assembling.
In order to be better understood from technical scheme and technique effect, below with reference to schematic flow sheet to specific
Embodiment is described in detail.As shown in figure 1, it is the speed computational methods according to commercial car provided in an embodiment of the present invention
The first flow chart, this method may comprise steps of：
Step S01, obtain the distance between shaft center and ground and be used as tire radius.
In the present embodiment, can using the sensors such as radar come in real time obtain between shaft center and ground away from
From, it is more accurate as tire radius relative to use setting value of the prior art, for example, when tire pressure, vehicle load, outside
When temperature, vehicle running state (when static, motion or movement velocity difference) etc. change, the radius of tire can all become
Change, during using setting value as tire radius, the result of calculation of speed has deviation certainly in off-rating.It is and of the invention
Tire radius are used as using the distance between the current shaft center monitored and ground, are the real radius of present tire
(for measured value), it is ensured that the degree of accuracy for the speed being calculated according to the tire radius.
Step S02, obtain vehicle and convert into driving wheel speed per minute as tire rotational speed.
In the present embodiment, real-time rotating speed can be obtained by speed probe, then by electronic control unit, is such as combined
The electronic control unit of instrument is converted into vehicle and converts into driving wheel speed per minute, it is of course also possible to be other electronics controls
Unit processed, such as anti-blocking brake system ABS convert into vehicle to the electronics control per minute for driving wheel speed to be sent to combination instrument
Unit processed, in addition, prior art can obtain vehicle convert into it is per minute driving wheel speed technology be all suitable for, do not limit herein.
In a specific embodiment, vehicle converts into driving wheel speed per minute by ABS every one CAN report of 50ms outputs
Text, every 50ms receptions, once the CAN message from ABS, the rotary speed information included using in the CAN message are used as car to combination instrument
Convert into driving wheel speed per minute.
Step S03, speed is obtained according to the tire radius and tire rotational speed.
In the present embodiment, the computational methods of vehicle speed can use formula (1)：
Speed of operation=vehicle of vehicle converts into driving wheel speed × driving wheel radius × 60 (1) per minute
The current vehicle speed of vehicle can be calculated by formula (1), other formula can also be used to calculate certainly current
Speed, do not limit herein.After the speed is obtained, it can be shown by the speedometer of combination instrument.
In other embodiments, methods described can also include：
After speed is obtained, VMT Vehicle-Miles of Travel is obtained according to the speed.Specifically, side that is cumulative or integrating is passed through
Formula obtains the distance travelled of vehicle.Of course, it is possible to show the distance travelled by mileometer, will not be described in detail herein.Due to logical
Cross real-time tire radius and tire rotational speed determines vehicle speed so that vehicle speed of operation is in vehicle zero load, load-carrying, environment
It is accurate speed during temperature change etc., the accuracy of the accumulated distance lifted indirectly
The speed computational methods of commercial car provided by the invention, due to being between the shaft center of reality and ground
Distance is used as tire radius, rather than effectively improves the degree of accuracy of tire radius as tire radius using preset value；Then
Obtain vehicle and convert into driving wheel speed per minute as tire rotational speed, and according to the tire radius and tire rotational speed acquisition car
Speed.So that speed computational methods provided by the invention are without using traditional rear-end ratio, gearbox mileometer speed ratio etc.
Parameter, thus a variety of instrument need not be equipped with for commercial car to adapt to be used for rear-end ratio, speed change corresponding to different loading capacity
Case mileometer speed ratio, numerous and diverse degree of production assembling is enormously simplify, and because tire radius and tire rotational speed are Current vehicle
Actual value so that result of calculation is more accurate.
As shown in Fig. 2 second of flow chart for the speed computational methods according to commercial car provided in an embodiment of the present invention.
In the present embodiment, methods described also includes：
Step S21, the distance between shaft center and ground are used as initial tire radius when obtaining stationary vehicle.
In the present embodiment, it is contemplated that the distance between the shaft center measured in real time and ground not necessarily can be accurate
Reflect tire radius, for example, when road surface has roadblock, when sensor passes through from roadblock, because roadblock has highly, cause to measure
Shaft center and the distance between ground be less than real tire radius, if can be caused using the distance as tire radius
Result of calculation is inaccurate, and therefore, when existing, roadblock, surface evenness are more low to cause the distance between shaft center and ground
, it is necessary to a value closer to true tire radius be provided in order to calculate speed, therefore, this reality when deviateing true tire radius
The distance between shaft center and ground conduct initial tire radius when example obtains stationary vehicle are applied, during due to stationary vehicle,
Generally it can be thought that the distance between shaft center and ground are equal to tire radius, certainly, in order to ensure the initial wheel of acquisition
The degree of accuracy of the value of tire radius, the reliability on the distance between shaft center and ground can be determined whether, for example, passing through
Set the distance between shaft center and the ground of multiple radar monitoring diverse locations whether consistent, if it is, thinking this
The tire radius of vehicle, initial tire radius is used as using it when value is equal to static.Certainly, in other embodiments, for simplification
Technical scheme, initial tire radius can also be set as a preset value, do not limited herein.
The acquisition shaft center includes with the distance between ground conduct tire radius：
Step S22, the distance between center and ground of multiple diverse locations of drive shaft are obtained respectively as alternative wheel
Tire radius.
In the present embodiment, in order to ensure acquisition tire radius data reliability, respectively obtain drive shaft it is more
The distance between center and ground of individual diverse location, can so the data obtained be judged according to the dispersion of multiple distances
Reliability, for example, when road surface exist obstacle cause some radar obtain distance compared with the distance that other radars obtain it is bright
Aobvious hour, the then it is considered that reliability of the distance currently obtained is not high, it is impossible to as tire radius.
Whether step S23, the difference calculated between maximum alternative tire radius and minimum alternative tire radius exceed setting
Threshold value, if it is, using initial tire radius as present tire radius, if it is not, then being averaged with each alternative tire radius
Value is used as present tire radius.
In the present embodiment, the given threshold can empirically or experimentally depending on, for example, 0.01 meter, 0.02 meter,
0.025 meter, 0.03 meter etc..Further, it is also possible to the reliable of the data of the tire radius of acquisition is examined by indexs such as dispersions
The distance between degree, the other centers that can be used for the drive shaft that examination obtains and ground can all fit as the method for tire radius
With.
It should be noted that can in vehicle operation by the radius information of the real-time collection wheel of above-mentioned steps,
A tire radius can be gathered in stationary vehicle, are gathered when all using last time stationary vehicle before next stationary vehicle
Tire radius, it so can effectively reduce information gathering, processing and take computing resource, the amount of Internet resources, lifting system effect
Rate.
Method provided by the invention simply can accurately obtain tire radius in real time, and with the energy of identification wrong data
Power, undesirable data can be screened out, it is ensured that the degree of accuracy of the tire radius of acquisition.
As shown in figure 3, the third flow chart for the speed computational methods according to commercial car provided in an embodiment of the present invention.
In the present embodiment, in order to lift the degree of accuracy of the speed of acquisition, also further the tire radius of acquisition are carried out
The degree of accuracy of amendment, the effectively tire radius that lifting obtains.
In one embodiment, methods described also includes：
Step S31, the comparison table of tire pressure and tire radius is demarcated in advance.
Step S32, tire pressure is monitored while the tire radius are obtained.
Step S33, the tire radius are entered according to the comparison table of current tire pressure and the tire pressure and tire radius
Row amendment, obtains the first amendment tire radius.For example, tire pressure, i.e., different tire pressure ranges are obtained by CAN
Under have different tire radius initial alignment values, to there is one to be relatively defined when accurate radius of wheel can not be got
Standby radius of wheel.It is of course also possible to the tire radius obtained in real time are modified using the tire pressure.
It is described to be included according to the tire radius and tire rotational speed acquisition speed：According to the first amendment tire radius and tire
Rotating speed obtains speed.
In another embodiment, methods described also includes：
Step S34, the comparison table of load-carrying and tire radius is demarcated in advance.
Step S35, load-carrying is monitored while the tire radius are obtained.For example, to ensure accurate, system of speed
It is also provided with feeling set sensor, senses the load-carrying of vehicle.
Step S36, the tire radius are entered according to the comparison table of live load and the load-carrying and tire radius
Row amendment, obtains the second amendment tire radius.For example, vehicle has done calibration value to the tire radius of different load-carryings, i.e., every
0.1st, 0.2,0.3 or 0.4 ton of load-carrying corresponds to different tire radius, i.e., the tire radius under different load-carryings is modified.
It is described to be included according to the tire radius and tire rotational speed acquisition speed：According to the second amendment tire radius and tire
Rotating speed obtains speed.
In yet another embodiment, methods described also includes：
Step S37, the comparison table of load-carrying and tire radius is demarcated in advance.The table of comparisons and compareing in step S034
Table is different, to consider the load-carrying under tire pressure condition and the comparison table of tire radius.
Step S38, load-carrying is monitored while the first amendment tire radius are obtained.
Step S39, the described first amendment is taken turns according to the comparison table of live load and the load-carrying and tire radius
Tire radius is modified, and obtains the 3rd amendment tire radius；
It is described to be included according to the first amendment tire radius and tire rotational speed acquisition speed：
Speed is obtained according to the 3rd amendment tire radius and tire rotational speed.
The tire radius measured are corrected, made by the speed computational methods of commercial car provided in an embodiment of the present invention
Required precision can be met in all cases by obtaining tire radius so that more accurate according to the speed that the tire radius obtain.
Correspondingly, present invention also offers the speed computing system of commercial car corresponding with the above method, as shown in figure 4,
For the first structural representation of the speed computing system according to commercial car provided in an embodiment of the present invention, the system can wrap
Include：
Combination instrument, radar, anti-blocking brake system and power supply, the power supply give the combination instrument and the braking
Anti-lock braking system is powered, and the anti-blocking brake system is connected by CAN with the combination instrument, the radar with it is described
Combination instrument is connected.
The power supply can be battery etc., and the radar is used to gather the distance between shaft center and ground, concurrently
Give the combination instrument.The anti-blocking brake system is used to that driving wheel per minute will to be converted into comprising vehicle by CAN
The message of rotary speed information is sent to the combination instrument.The combination instrument is used between the shaft center of reception and ground
Distance as tire radius, convert into the vehicle of reception to driving wheel speed per minute and be used as tire rotational speed, then described in basis
Tire radius and the tire rotational speed calculate speed, and are shown.
For example, the radar totally three, the left end, right-hand member and centre position of drive shaft, referred to as left thunder are separately positioned on
Reach, right radar and middle radar, between the left end, right-hand member and the center in centre position and ground for gathering drive shaft away from
From as each alternative tire radius.The system also includes：
The parking brake switch being connected with the combination instrument, for sending parking brake signal to the combination instrument；And with institute
The connected service brake switch of combination instrument is stated, for sending service brake signal to the combination instrument.
The combination instrument be used for receive parking brake signal and/or service brake signal and maximum alternative tire radius with most
When the difference of small alternative tire radius is less than given threshold, using the average of each alternative tire radius as initial tire radius；Not
When receiving parking brake signal and/or service brake signal, the difference between maximum alternative tire radius and minimum alternative tire radius is calculated
Whether value exceedes given threshold, if it is, using initial tire radius as present tire radius, if it is not, then with each alternative
The average value of tire radius is as present tire radius.
In a specific embodiment, the system eliminates traditional speedometer and uses rear-end ratio, gearbox mileage
Table speed ratio, directly convert into driving wheel speed × tire radius × 60 per minute using vehicle and obtain the speed of operation of vehicle.Wherein
Vehicle converts into driving wheel speed per minute and obtained by abs controller node in CAN, and ABS nodes export once per 50ms
Wheel speed is driven, in order to which instrument calculates renewal speed.Vehicle is provided with survey in the left side of drive axle drive shaft, right side, centre
Away from radar, when vehicle is in halted state, such as combination instrument IPC by detect parking brake switch K1 be in closure state with/
Or service brake switch K2 be in closure state, and when now the CAN message display driving wheel speed from ABS is 0, measurement drive shaft
Center and ground distance, the value is the exact value of current radius of wheel, and the true and accurate of vehicle is calculated using the value
Test the speed 3 of speed, but the value is inaccurate in the case of Uneven road, i.e. range radar apart from its difference exceed given threshold when
Measuring distance is inexact data, and combination instrument speedometer will not use the data.
As shown in figure 5, second of structure for the speed computing system according to commercial car provided in an embodiment of the present invention is shown
It is intended to.
In one embodiment, the system can also include：
The tire pressure monitoring controller TPMS being connected by CAN with the combination instrument, for the combination instrument
IPC sends the message for including tire pressure.The combination instrument IPC is used for the comparison table for storing tire pressure and tire radius,
According to the comparison table of current tire pressure and the tire pressure and tire radius to the tire radius after tire pressure is received
It is modified, obtains the first amendment tire radius, then obtains speed according to the first amendment tire radius and tire rotational speed.
In another embodiment, the system also includes：
The sense set sensor being connected with the combination instrument IPC, for gathering vehicle load information, and it is sent to described group
Close instrument IPC.The combination instrument IPC is used for the comparison table for storing load-carrying and tire radius, is receiving vehicle load
The tire radius are modified according to the comparison table of live load and the load-carrying and tire radius after information, obtained
Second amendment tire radius, then obtain speed according to the second amendment tire radius and tire rotational speed.
Specifically, IPC by CAN obtain the tire pressure value from TPMS, tire radius=present tire radius × when
Tire radius correction coefficient (calibration value) under front tyre pressure tire radius correction factor (calibration value) × live load.Current tire pressure
Tire radius correction coefficient passes through experimental calibration in vehicle development under lower tire radius correction coefficient and live load.
In the specification that this place provides, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice in the case of these no details.In some instances, known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more of each inventive aspect,
Above in the description to the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：I.e. required guarantor
The application claims of shield features more more than the feature being expressly recited in each claim.
It will be understood by those skilled in the art that the module in the device in embodiment can adaptively be changed
And they are arranged in one or more equipment different from the embodiment.Can the module in embodiment or unit or
Component is combined into a module or unit or component, and can be divided into multiple submodule or subelement or subgroup in addition
Part.In addition at least some in such feature and/or process or unit exclude each other, any combinations can be used
To all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and such disclosed any side
All processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint right will
Ask, make a summary and accompanying drawing) disclosed in each feature can be replaced by the alternative features for providing identical, equivalent or similar purpose.
In addition, it will be appreciated by those of skill in the art that although embodiment described herein includes institute in other embodiments
Including some features rather than further feature, but the combination of the feature of different embodiments means to be in the scope of the present invention
Within and form different embodiments.For example, in the following claims, embodiment claimed it is any it
One mode can use in any combination.
The all parts embodiment of the present invention can be realized with hardware, or to be run on one or more processor
Software module realize, or realized with combinations thereof.It will be understood by those of skill in the art that it can use in practice
Microprocessor or digital signal processor (DSP) according to embodiments of the present invention are used for multioperation end remote control list to realize
Some or all functions in the system of operation object.The present invention is also implemented as being used to perform method as described herein
Some or all equipment or system program (such as computer program and computer program product).It is such to realize this
The program of invention can store on a computer-readable medium, or can have the form of one or more signal.So
Signal can download and obtain from the website of internet, can also be provided on carrier signal, or in the form of any other
There is provided.
It should be noted that above-described embodiment is that the present invention will be described rather than limited the invention, and
Those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not excluded for depositing
In element or step not listed in the claims etc..Word "a" or "an" before element does not exclude the presence of more
Individual such element.The present invention can be by means of including the hardware of some different elements and by means of properly programmed calculating
Machine is realized.In if the unit claim of dry systems is listed, several in these systems can be by same
Hardware branch embodies.Word first, second and third use do not indicate that any order.These words can be explained
For title.
Claims (10)
- A kind of 1. speed computational methods of commercial car, it is characterised in that including：Obtain the distance between shaft center and ground and be used as tire radius；Obtain vehicle and convert into driving wheel speed per minute as tire rotational speed；Speed is obtained according to the tire radius and tire rotational speed.
- 2. according to the method for claim 1, it is characterised in that methods described also includes：The distance between shaft center and ground are used as initial tire radius when obtaining stationary vehicle；The acquisition shaft center includes with the distance between ground conduct tire radius：The distance between center and ground of multiple diverse locations of drive shaft are obtained respectively as alternative tire radius；Whether the difference calculated between maximum alternative tire radius and minimum alternative tire radius exceedes given threshold, if it is, Then using initial tire radius as present tire radius, if it is not, then using the average value of each alternative tire radius as working as front-wheel Tire radius.
- 3. according to the method for claim 1, it is characterised in that methods described also includes：The comparison table of demarcation tire pressure and tire radius in advance；Tire pressure is monitored while the tire radius are obtained；The tire radius are modified according to the comparison table of current tire pressure and the tire pressure and tire radius, obtain One amendment tire radius；It is described to be included according to the tire radius and tire rotational speed acquisition speed：Speed is obtained according to the first amendment tire radius and tire rotational speed.
- 4. according to the method for claim 1, it is characterised in that methods described also includes：The comparison table of demarcation load-carrying and tire radius in advance；Load-carrying is monitored while the tire radius are obtained；The tire radius are modified according to the comparison table of live load and the load-carrying and tire radius, obtain Two amendment tire radius；It is described to be included according to the tire radius and tire rotational speed acquisition speed：Speed is obtained according to the second amendment tire radius and tire rotational speed.
- 5. according to the method for claim 3, it is characterised in that methods described also includes：The comparison table of demarcation load-carrying and tire radius in advance；Load-carrying is monitored while the first amendment tire radius are obtained；The described first amendment tire radius are repaiied according to the comparison table of live load and the load-carrying and tire radius Just, the 3rd amendment tire radius are obtained；It is described to be included according to the first amendment tire radius and tire rotational speed acquisition speed：Speed is obtained according to the 3rd amendment tire radius and tire rotational speed.
- 6. according to the method described in any one of claim 1 to 5, it is characterised in that methods described also includes：After speed is obtained, VMT Vehicle-Miles of Travel is obtained according to the speed.
- A kind of 7. speed computing system of commercial car, it is characterised in that including：Combination instrument, radar, anti-blocking brake system and power supply, the power supply give the combination instrument and the ABS Dead system power supply, the anti-blocking brake system are connected by CAN with the combination instrument, the radar and the combination Instrument is connected；The radar is used to gather the distance between shaft center and ground, and is sent to the combination instrument；The anti-blocking brake system is used for the message that will convert into driving wheel rotary speed information per minute comprising vehicle by CAN It is sent to the combination instrument；The combination instrument is used for using the distance between the shaft center of reception and ground as tire radius, by the car of reception Equivalent driving wheel speed per minute is used as tire rotational speed, then according to the tire radius and tire rotational speed calculating car Speed, and shown.
- 8. system according to claim 7, it is characterised in that the radar totally three, be separately positioned on a left side for drive shaft End, right-hand member and the distance between centre position, left end, right-hand member and the center in centre position and ground for gathering drive shaft, As each alternative tire radius；The system also includes：The parking brake switch being connected with the combination instrument, for sending parking brake signal to the combination instrument；AndThe service brake switch being connected with the combination instrument, for sending service brake signal to the combination instrument；The combination instrument is used to receive parking brake signal and/or service brake signal, tire rotational speed zero and maximum alternative tire When the difference of radius and minimum alternative tire radius is less than given threshold, using the average of each alternative tire radius as initial tire half Footpath；When not receiving parking brake signal and/or service brake signal, calculate maximum alternative tire radius and minimum alternative tire radius it Between difference whether exceed given threshold, if it is, using initial tire radius as present tire radius, if it is not, then with The average value of each alternative tire radius is as present tire radius.
- 9. system according to claim 7, it is characterised in that the system also includes：The tire pressure monitoring controller being connected by CAN with the combination instrument, included for being sent to the combination instrument The message of tire pressure；The combination instrument is used for the comparison table for storing tire pressure and tire radius, according to current after tire pressure is received The comparison table of tire pressure and the tire pressure and tire radius is modified to the tire radius, obtains the first amendment tire half Footpath, then obtain speed according to the first amendment tire radius and tire rotational speed.
- 10. system according to claim 7, it is characterised in that the system also includes：The sense set sensor being connected with the combination instrument, for gathering vehicle load information, and it is sent to the combination instrument；The combination instrument is used for the comparison table for storing load-carrying and tire radius, the basis after vehicle load information is received The comparison table of live load and the load-carrying and tire radius is modified to the tire radius, obtains the second amendment wheel Tire radius, then obtain speed according to the second amendment tire radius and tire rotational speed.
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| CN201710734909.3A CN107554529B (en) | 2017-08-24 | 2017-08-24 | Method and system for calculating vehicle speed of commercial vehicle |
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| CN201710734909.3A CN107554529B (en) | 2017-08-24 | 2017-08-24 | Method and system for calculating vehicle speed of commercial vehicle |
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| CN109455090A (en) * | 2018-11-20 | 2019-03-12 | 安徽江淮汽车集团股份有限公司 | The adjustable combination instrument of speed and control method |
| CN111409647A (en) * | 2020-03-31 | 2020-07-14 | 潍柴动力股份有限公司 | Vehicle speed correction method and device and vehicle |
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| CN113734237B (en) * | 2021-11-03 | 2022-02-08 | 比亚迪股份有限公司 | Method for determining wheel diameter of vehicle, storage medium and electronic device |
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