CN105946579A - Method for monitoring flat tires of automobiles - Google Patents
Method for monitoring flat tires of automobiles Download PDFInfo
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- CN105946579A CN105946579A CN201610471766.7A CN201610471766A CN105946579A CN 105946579 A CN105946579 A CN 105946579A CN 201610471766 A CN201610471766 A CN 201610471766A CN 105946579 A CN105946579 A CN 105946579A
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- wheel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
- B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle
- B60K28/14—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle responsive to accident or emergency, e.g. deceleration, tilt of vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a method for monitoring flat tires of automobiles. The method includes main steps of I, acquiring the current rotational speeds of n wheels required to be monitored; II, computing flat tire judgment threshold values delta; III, computing the average curvature L<1> of the rotational speeds of the various wheels in time periods t; IV, judging the automobiles have the flat tires or not, determining that the certain wheels have the flat tires if L values of the certain wheels are higher than or equal to the flat tire judgment threshold values delta, immediately transmitting brake instructions, timely automatically braking the automobiles, completing monitoring procedures, or determining that the various wheels of the current automobiles are safe if the automobiles do not have the flat tires; VI, updating the time periods t, automatically releasing first groups of rotational speed data when (k+1)<th> groups of rotational speed data are acquired by computers, updating the time periods to obtain next t time periods and carrying out the step I to continue monitoring the flat tires. The flat tire judgment threshold values delta meet an equation of delta=[V/(pi*d)-V/(pi*D)]/0.75. The average change curvature L<1> meets an equation of L<1>=(W<1>-W<11>)/t. The method has the advantages that the flat tire judgment threshold values are set on the basis of standards, and the flat tires can be accurately and timely judged; the method is simple and is high in reliability and low in implementation cost.
Description
Technical field
The present invention relates to automotive safety control field, the monitoring method of a kind of automobile flat tire.
Background technology
If the burst of automobile tire under steam is blown out or seriously leaked gas, this Outer Tyre will depart from normally
Position, the most dangerous situation is that tire departs from wheel hub, causes wheel hub external annular surface to contact with ground, blows out
Make automobile steering out of control, disequilibrium, it is impossible to manipulation, easily cause severe traffic accidents.If can be
Brake deceleration timely and effectively in 1s～2s after tyre break, so that it may avoid vehicle generation out-of-control phenomenon,
Effectively prevent occupant injured or more unfortunate accident occurs.
Motor field current existing monitoring technology is all by installing baroceptor and pressure on tire
The modes such as switch by being sent to the air pressure monitoring device of this car by air pressure testing result through wireless signal transmission
On judge.This type of tire pressure monitoring system all uses wireless communication mode, is called for short TPMS.Pass through
Detect each tire pressure, and to be wirelessly transmitted to the center processor of this car pressure monitoring system, work as center
Processor monitors certain tire pressure bust and is i.e. judged to blow out to the air pressure threshold value of blowing out set, will be vertical
I.e. start brake gear.But the detection of the air pressure of TPMS system has time interval, is typically separated about 3s very
To may be longer, TPMS system battery energy the most just can be made to hold time longer.In order to improve monitoring
Real-time, it is ensured that positive braking in the 2s that blows out, it is necessary to the air pressure of TPMS system is detected cycle time
To 200ms or shorter, but carrying out air pressure detection the most frequently, TPMS system battery energy will be not enough to
Maintain the steady operation of 2000 hours, the life-span of the most only tens days.In order to extend battery service life,
TPMS is in low power consumpting state, and its wireless transmission signal is more weak, is easily disturbed.Make additionally, due to device
Powering with battery, battery needs often to change, and waste battery easily pollutes environment.
Visible existing tire pressure monitoring system real-time or working life are all difficult to meet monitoring of blowing out
Requirement, and have pollute environment defect.
Summary of the invention
It is an object of the invention to provide the monitoring method of a kind of automobile flat tire, monitor each wheel of automobile in real time
Rotating speed mean change curvature value within certain period, when the mean change of the rotating speed monitoring certain wheel
Curvature is more than or equal to threshold value, it is determined that for blowing out.This method is accurate, real-time, can find in time to blow out,
In effective time limit, brake Accident prevention occurs.
The monitoring method of a kind of automobile flat tire that the present invention provides is on each wheel needing monitoring of automobile
Installing speed probe, each speed probe is connected with signal processor, and signal processor is according in real time
The rotating speed monitoring each wheel the curvature value of the rotation speed change calculating each wheel, and with threshold ratio relatively, with this
Determine whether to blow out.
When certain tire burst or serious gas leakage tire pressure drastically decline, the diameter of this wheel will substantially
Reduce, but speed does not change, and causes this vehicle wheel rotational speed to rise rapidly, state specified standards GB/T
In in 30513 2014 3.1, the definition for blowing out is: " pneumatic tire air pressure declines in 750ms
Process to current environment air pressure." according to this standard, process duration of blowing out equals to or less than
750ms.The present invention with tire pressure drop to time of current environment air pressure equal to 750ms time, wheel
Rotating speed be threshold value about the average curvature that the time changes.When tire pressure drops to current environment air pressure
When time is less than or equal to 750ms, the curvature of vehicle wheel rotational speed change can exceed this threshold value, and the present invention is with this
As judging the method occurred of blowing out.
The monitoring method of a kind of automobile flat tire of present invention design mainly comprises the steps:
Step I, obtain current each vehicle wheel rotational speed data
It is separately mounted on automobile need the speed probe on n wheel of monitoring by the rotating speed of each wheel
Signal sends into signal processor, and n is more than or equal to 2.
When automobile is 2～4 wheels, 2～4 wheels is respectively mounted speed probe, works as automobile
There is the wheel of more than 4, only on 2 wheels about 2, the left and right of forefront wheel and rearmost
Speed probe is installed, blows out because of other wheel and major accident also will not occur, so without by this method
Monitoring.Dual wheels for two one group is not monitored, because the possibility simultaneously blown out with two wheels of group
Minimum.
Signal processor arranges sampling time section t, and t is 100ms～500ms, rises in each time period t
Start the signal sampling simultaneously to n wheel speed sensor during the beginning, sample every Δ t signal processor
Once, Δ t is 1ms～3ms；Sampling k time altogether in time period t, k is t/ Δ t, signal processor
Obtaining k group tach signal successively, often group is n tach signal.
Signal amplitude for avoiding speed probe to export is little or distortion, the signal warp of speed probe output
Cross after a signal shaping amplifier is filtered processing and send into signal processor, it is ensured that sampling obtains
Wheel rotation speed signals is reliable and stable.Gained k group tach signal, often group is W for n tach signal11～Wn1,
W12～Wn2... W1k～Wnk。
Step II, calculate and blow out decision threshold δ
Set the δ decision threshold of blowing out as Automobile tire described in step I
δ=(V/ π d-V/ π D)/0.75
In formula, V is the current vehicle speed of automobile, D be tire pressure normal time diameter of tyres, d is that tire pressure drops to
Equal to diameter of tyres during ambient pressure.
Working as its rotating speed for certain wheel i is Wi, then straight ahead speed corresponding for this wheel i is vi
vi=π DWi
The vehicle velocity V of automobile is by the v of its whole N number of wheelsiDetermine, in order to make the vehicle velocity V calculated connect
Nearly actual value, first removes N number of viIn maximum, seek remaining N-1 viMeansigma methods as final car
Speed V.
V=[(v1+v2+…vi…+vN)-(v1,v2,…vi…,vN)max]/(N-1)
Car each wheel tyre specification in same portion is identical, and diameter is D,
V=π D [(W1+W2+…Wi…+WN)-(W1,W2,…Wi…,WN)max]/(N-1)=π DW
W is N-1 the W removing maximum (top) speediMeansigma methods.W=V/ π D.
When certain wheel is blown out, tire pressure drops to equal to ambient pressure in 750ms, and diameter of tyres is kept to d,
And now vehicle velocity V does not change, the overswing of this wheel of blowing out is V/ π d,
The average curvature that the rotating speed of wheel of so blowing out changed about the time meets:
Therefore set the above-mentioned δ decision threshold of blowing out as this vehicle tyre.
Step III, calculate the rotating speed of each wheel mean change curvature in period t
The rotating speed of n wheel of calculating mean change curvature value L in period t, first wheel respectively
Rotating ratio mean change curvature L in period t1It is calculated as follows:
L1=(W1k-W11)/t
The rotating speed of other n-1 wheel mean change curvature L in period t2,L3,…,LnComputational methods
Ibid.
Step IV, judgement are whether blown out
If this vehicle tyre that the L-value of certain wheel of step III gained sets more than or equal to step II
Blow out decision threshold δ, it is determined that this wheel is blown out；Signal processor sends brake instruction immediately to this car
Autobrake system, performs automatic brake operation in time, and terminates monitoring；
If the L-value of n wheel of step III gained is showed no more than or equal to step II setting
The decision threshold δ that blows out of this vehicle tyre, it is determined that currently this car each wheel safety.
Until stopping, terminating monitoring, otherwise entering step VI.
Step VI, renewal period t
Computer, when obtaining kth+1 group rotary speed data, is automatically releasable the 1st group of rotary speed data, is updated to
The next t period, the t period i.e. updated by former 2nd Δ t to+1 Δ t of kth, blowing out of step III
Judge an interval of delta t.Return step I.
Before described step II is carried out, signal processor monitoring current vehicle speed, as speed≤30km/h, stop
Monitoring, is directly entered step VI.Because speed is blown out less than in the case of 30km/h, automobile will not be out of control
Dangerous situation occurs, it is not necessary to take automatic brake operation.
Before described step II is carried out, signal processor monitors this car brake system, if brake system exists
Carry out skidding, stop monitoring, be directly entered step VI, the most without necessity of monitoring.
Before this method performs, measure and regulate the tire pressure value of each wheel so that the difference symbol of each wheel tyre pressure
Close the standard of this car genuine defined.
Compared with prior art, the advantage of the monitoring method of a kind of automobile flat tire of the present invention is: 1, by prison
Survey main road wheels rotating speed mean change curvature in period t, with threshold ratio relatively, judge real-time and accurately
Whether blow out, so that automobile brake system is braked in time, reduce because of the probability that serious accident occurs of blowing out；2、
With standard as foundation, setting decision threshold of blowing out, the accuracy of judgement making signal processor is timely；3, this law
Simply, reliability is high, it is not necessary to installing extra device for monitoring tyre pressure, implementation cost is low.
Accompanying drawing explanation
Fig. 1 is the monitoring method embodiment flow chart of this automobile flat tire；
Fig. 2 be the wheel blown out of the monitoring method embodiment of this automobile flat tire 1. during blowing out with other
The rotation speed change curve chart of normal tire.
Detailed description of the invention
The monitoring method embodiment of this automobile flat tire takes turns truck for 4, and this example uses specification to be 225/40
The tire of R18, vehicle tyre tire pressure normal diameter D=637.2mm, after tyre explosion, tire pressure drops to be equal to
Diameter of tyres d=457.2mm during ambient pressure, before this method performs, measures and regulates each wheel
Tire pressure value so that the difference of each wheel tyre pressure meets the standard of this car genuine defined.This example flow chart such as figure
Shown in 1, mainly comprise the steps:
Step I, obtain current each vehicle wheel rotational speed data
The speed probe that this example is installed respectively on 4 wheels of automobile, each speed probe is surveyed respectively
The tach signal of wheel sends into signal processor after signal shaping amplifier is filtered processing.
Signal processor arranges sampling time section t, and t is 400ms, starts when each time period t initiates
Signal sampling to 4 wheel speed sensors simultaneously, samples once every Δ t signal processor, this
Example Δ t=2ms；Sampling altogether in time period t k=t/ Δ t=2000 time, signal processor obtains 2000 successively
Group tach signal, often group is 4 tach signals.
Step II, calculate and blow out decision threshold δ
Before this step II is carried out, signal processor monitoring current vehicle speed, as speed≤30km/h, stop prison
Survey, be directly entered step VI.
Before this step II is carried out, signal processor monitors this car brake system, if brake system is being entered
Row skidding, stops monitoring, is directly entered step VI.
This example δ is the decision threshold of blowing out of Automobile tire described in step I
In formula, V is the current vehicle speed of automobile.
Step III, calculate the rotating speed of each wheel mean change curvature in period t
The rotating speed of 4 wheels of calculating mean change curvature value L in period t, first wheel respectively
Rotating ratio mean change curvature L in period t1It is calculated as follows:
L1=(W1k-W11)/t
The rotating speed of other 3 wheels mean change curvature L in period t2,L3,L4Computational methods are identical.
Step IV, judgement are whether blown out
If this vehicle tyre that the L-value of certain wheel of step III gained sets more than or equal to step II
Blow out decision threshold δ, it is determined that this wheel is blown out；Signal processor sends brake instruction immediately to this car
Autobrake system, performs automatic brake operation in time, and terminates monitoring；In Fig. 2, abscissa is the time,
Vertical coordinate is rotating speed, and wherein dotted line show wheel and 1. blows out the rotation speed change curve of process, and solid line is it
The rotation speed change curve of its normal tire.
If the L-value of the 4 of step III gained wheels is showed no more than or equal to step II setting
The decision threshold δ that blows out of this vehicle tyre, it is determined that currently this car each wheel safety.
Until stopping, terminating monitoring, otherwise entering step VI.
Step VI, renewal period t
Computer, when obtaining kth+1 group rotary speed data, is automatically releasable the 1st group of rotary speed data, is updated to
The next t period, the t period i.e. updated by former 2nd Δ t to+1 Δ t of kth, blowing out of step III
Judge an interval of delta t=2ms.Return step I.
Above-described embodiment, is only to the purpose of the present invention, technical scheme and beneficial effect the most specifically
Bright specific case, the present invention is not limited to this.All done within the scope of disclosure of the invention
Any modification, equivalent substitution and improvement etc., within being all contained in protection scope of the present invention.
Claims (7)
1. a monitoring method for automobile flat tire, mainly comprises the steps:
Step I, obtain current each vehicle wheel rotational speed data
It is separately mounted on automobile need the speed probe on n wheel of monitoring by the rotating speed of each wheel
Signal sends into signal processor, and n is more than or equal to 2；
Signal processor arranges sampling time section t, and t is 100ms～500ms, rises in each time period t
Start the signal sampling simultaneously to n wheel speed sensor during the beginning, sample every Δ t signal processor
Once；Sampling k time altogether in time period t, k is t/ Δ t, and signal processor obtains k group rotating speed successively
Signal, often group is n tach signal；
Step II, calculate and blow out decision threshold δ
Set the δ decision threshold of blowing out as Automobile tire described in step I
In formula, V is the current vehicle speed of automobile, D be tire pressure normal time diameter of tyres, d is that tire pressure drops to
Equal to diameter of tyres during ambient pressure；
Step III, calculate the rotating speed of each wheel mean change curvature in period t
The rotating speed of n wheel of calculating mean change curvature value L in period t, first wheel respectively
Rotating ratio mean change curvature L in period t1It is calculated as follows:
L1=(W1k-W11)/t
The rotating speed of other n-1 wheel mean change curvature L in period t2,L3,…,LnComputational methods
Identical.
Step IV, judgement are whether blown out
If blowing out of the tire that the L-value of certain wheel of step III gained sets more than or equal to step II
Decision threshold δ, it is determined that this wheel is blown out；Signal processor sends automatic to this car of brake instruction immediately
Brake system, performs automatic brake operation in time, and terminates monitoring；
If the L-value of n wheel of step III gained is showed no more than or equal to step II setting
The decision threshold δ that blows out of this vehicle tyre, it is determined that currently this car each wheel safety；Until stopping, terminate prison
Survey, otherwise enter step VI；
Step VI, renewal period t
Computer, when obtaining kth+1 group rotary speed data, is automatically releasable the 1st group of rotary speed data, is updated to
The next t period；Return step I.
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
When automobile is 2～4 wheels, 2～4 wheels are respectively mounted speed probe；Work as automobile
There is the wheel of more than 4, only on 2 wheels about 2, the left and right of forefront wheel and rearmost
Speed probe is installed.
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
Δ t in described step I is 1ms～3ms.
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
The signal of described step I medium speed sensor output is filtered through a signal shaping amplifier
Ripple sends into signal processor, gained k group tach signal after processing, often group is W for n tach signal11~
Wn1, W12～Wn2... W1k～Wnk。
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
Described step II is carried out, signal processor monitoring current vehicle speed, as speed≤30km/h, stops prison
Survey, be directly entered step VI.
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
Before described step II is carried out, signal processor monitors this car brake system, if brake system exists
Carry out skidding, stop monitoring, be directly entered step VI.
The monitoring method of automobile flat tire the most according to claim 1, it is characterised in that:
Before this method performs, measure and regulate the tire pressure value of each wheel so that the difference symbol of each wheel tyre pressure
Close the standard of this car genuine defined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610471766.7A CN105946579B (en) | 2016-06-24 | 2016-06-24 | A kind of monitoring method of automobile flat tire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610471766.7A CN105946579B (en) | 2016-06-24 | 2016-06-24 | A kind of monitoring method of automobile flat tire |
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| CN105946579B CN105946579B (en) | 2018-07-10 |
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Citations (6)
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|---|---|---|---|---|
| CN200977865Y (en) * | 2006-11-01 | 2007-11-21 | 谷海辉 | Tyre exploding monitor |
| JP2009035146A (en) * | 2007-08-02 | 2009-02-19 | Topy Ind Ltd | Tire monitoring system and method |
| CN101554830A (en) * | 2008-04-10 | 2009-10-14 | 傅建中 | Method for monitoring and sampling burst tire |
| CN101716873A (en) * | 2009-12-24 | 2010-06-02 | 浙江亚太机电股份有限公司 | Method for monitoring tire burst or severe air leakage of vehicle |
| CN103481876A (en) * | 2013-09-06 | 2014-01-01 | 浙江吉利控股集团有限公司 | Blowout brake control system and blowout brake control method |
| CN104709012A (en) * | 2013-12-11 | 2015-06-17 | 鸿富锦精密工业（深圳）有限公司 | Tire burst pre-warning system |
-
2016
- 2016-06-24 CN CN201610471766.7A patent/CN105946579B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200977865Y (en) * | 2006-11-01 | 2007-11-21 | 谷海辉 | Tyre exploding monitor |
| JP2009035146A (en) * | 2007-08-02 | 2009-02-19 | Topy Ind Ltd | Tire monitoring system and method |
| CN101554830A (en) * | 2008-04-10 | 2009-10-14 | 傅建中 | Method for monitoring and sampling burst tire |
| CN101716873A (en) * | 2009-12-24 | 2010-06-02 | 浙江亚太机电股份有限公司 | Method for monitoring tire burst or severe air leakage of vehicle |
| CN103481876A (en) * | 2013-09-06 | 2014-01-01 | 浙江吉利控股集团有限公司 | Blowout brake control system and blowout brake control method |
| CN104709012A (en) * | 2013-12-11 | 2015-06-17 | 鸿富锦精密工业（深圳）有限公司 | Tire burst pre-warning system |
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