CN106335490B - Brake fluid leakage treatment method and device for pure electric vehicle and pure electric vehicle - Google Patents
Brake fluid leakage treatment method and device for pure electric vehicle and pure electric vehicle Download PDFInfo
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- CN106335490B CN106335490B CN201610853388.9A CN201610853388A CN106335490B CN 106335490 B CN106335490 B CN 106335490B CN 201610853388 A CN201610853388 A CN 201610853388A CN 106335490 B CN106335490 B CN 106335490B
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- 239000012530 fluid Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000013598 vector Substances 0.000 claims description 25
- 230000009467 reduction Effects 0.000 claims description 21
- 238000007665 sagging Methods 0.000 claims description 21
- 230000001537 neural effect Effects 0.000 claims description 16
- 238000003672 processing method Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 17
- 239000003921 oil Substances 0.000 description 14
- 238000013528 artificial neural network Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012549 training Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
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- 238000004364 calculation method Methods 0.000 description 1
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- 230000001427 coherent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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Classifications
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- 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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- 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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/225—Devices for monitoring or checking brake systems; Signal devices brake fluid level indicators
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention provides a brake fluid leakage treatment method and device for a pure electric vehicle and the pure electric vehicle, wherein the method comprises the following steps: when a prompt signal that brake fluid generated by a hydraulic brake system of the pure electric automobile is lower than a preset value is received, judging whether a brake anti-lock system is in an un-started state; when the anti-lock braking system is in an inactivated state, acquiring the leakage degree of brake fluid; determining a leakage grade corresponding to the leakage degree according to a preset grade threshold value; and carrying out predefined reminding operation according to the leakage grade. Therefore, according to the scheme of the invention, different reminding operations can be carried out according to the specific leakage degree of the brake fluid, so that a driver can know the severity degree of the brake fluid leakage in time, and the driving safety is improved.
Description
Technical field
The present invention relates to the brake fluid of electric vehicle engineering field more particularly to a kind of pure electric automobile to leak processing side
Method, device and pure electric automobile.
Background technique
In face of increasingly severe energy and environment problem, conventional fuel oil automobile is to the increase of petroleum resources demand and brings
Environmental pollution increasingly caused the concern of people, energy conservation is just becoming the hot spot of various countries' research with new-energy automobile at the same time.
Energy conservation as one of China's strategic emerging industries has obtained the great attention of government and industry with new-energy automobile, develops
New-energy automobile, the especially pure electric automobile with no pollution, zero-emission, not only have Chinese energy safety, environmental protection
Be of great importance, at the same be also China's automotive field realize transition and upgrade, technological break-through important directions, be automotive field from now on
The trend of development.
The current pure electric automobile overwhelming majority both domestic and external uses electric vacuum pump to provide vacuum source for force aid system for braking,
And braking function is finally realized by brake fluid system.Wherein, electric vacuum pump is general basis specific to pure electric vehicle
Vacuum degree inside brake booster carries out bang-bang control to electric vacuum pump, guarantees that the vacuum degree inside booster maintains
In a certain range, to meet the brake boost demand of driver.However, for most of fuel vehicles, can from engine into
Gas manifold obtains vacuum source, therefore electric vacuum pump is not required, still, brake fluid system in pure electric automobile then base
This is identical as conventional fuel oil car.After driver's brake pedal, electric vacuum pump, booster are cooperateed with brake fluid system
Work, establishes brake fluid system pressure, final to push brake caliper piston work, realizes vehicle braking function.
Wherein, brake fluid is the important component of force aid system for braking, and current overwhelming majority pure electric automobile is to system
Hydrodynamic position is monitored, i.e., buoy is arranged in brake fluid oil pot, when braking liquid level drop to a certain degree then buoy decline into
And trigger switch, vehicle receive and remind driver's hydraulic braking by lighting brake fluid system trouble light after coherent signal
System jam.
In addition, braking liquid level is too low to will have a direct impact on braking effect, cause security risk, it is however generally that, when instrument is lighted
When brake fluid system trouble light, the braking liquid level in oil can at this time will not generate too vehicle braking substantially in minimum scale
It is big to influence, but along with the further leakage of brake fluid, the influence to brake fluid system also can be increasing.However, current
Pure electric automobile both domestic and external can only prompt operator brake liquid level lower by lighting brake fluid system trouble light, so that driving
The person of sailing can not know the severity of brake fluid leakage, so that there are some potential safety problemss.
Summary of the invention
In order to overcome the above-mentioned problems in the prior art, the embodiment provides a kind of pure electric automobiles
Brake fluid leaks processing method, device and pure electric automobile, can carry out different mention according to the specific leakiness of brake fluid
It wakes up and operates, the severity for understanding brake fluid leakage in time is allowed the operator to, to promote travel safety.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
One aspect according to an embodiment of the present invention provides a kind of brake fluid leakage processing method of pure electric automobile,
Include:
When the brake fluid that the brake fluid system for receiving pure electric automobile generates is lower than the standby signal of a preset value,
Judge whether anti-blocking brake system is in inactive state；
When the anti-blocking brake system is in inactive state, the leakiness of brake fluid is obtained；
According to pre-set grade threshold, the corresponding leakage class of the leakiness is determined；
According to the leakage class, prompting operation predetermined is carried out.
Wherein, in above scheme, it is described obtain brake fluid leakiness the step of, comprising:
Obtain the running state information of the pure electric automobile；
Using Radial Basis Function neural algorithm, information, obtains the leakiness of brake fluid according to the operation state.
Wherein, in above scheme, the running state information include: brake pedal be operated sagging stroke, braking step on
Vacuum degree and brake pedal when plate is operated in the vacuum booster of the pure electric automobile pure electric vehicle vapour when being operated
Amount of speed reduction of the vehicle within the unit time；
Described to use Radial Basis Function neural algorithm, information, obtains the leakiness of brake fluid according to the operation state
The step of, comprising:
Reduced according to the speed of the sagging stroke BPS, the vacuum degree P and the pure electric automobile within the unit time
Amount Δ V determines an input vector x=[BPS, P, Δ V]T；
The input vector is inputted into preset formulaIt is let out described in acquisition
Leakage degree Leak, wherein w1~w7It is constant, c1~c7It is predetermined known vector, φ is radial basis function.
Wherein, in above scheme, the grade threshold includes the first preset threshold and the second preset threshold, the leakage etc.
Grade includes that slight leakage, moderate leakage and severe leak three grades, wherein it is pre- that first preset threshold is less than described second
If threshold value；
It is described according to pre-set grade threshold, the step of determining the leakiness corresponding leakage class, comprising:
When the leakiness is less than first preset threshold, determine that the leakiness corresponds to slight leakage；
When the leakiness is greater than or equal to first preset threshold, and is less than second preset threshold, really
The fixed leakiness is leaked corresponding to moderate；
When the leakiness is greater than or equal to second preset threshold, determine that the leakiness corresponds to severe
Leakage.
Wherein, described according to the leakage class in above scheme, carry out the step of prompting predetermined operates, packet
It includes:
When the leakiness corresponds to slight leakage, control brake fluid system trouble light is lighted；
When the leakiness, which corresponds to moderate, to be leaked, control brake fluid system trouble light is lighted, and carries out sound
Alarm；
When the leakiness, which corresponds to severe, to be leaked, control brake fluid system trouble light is lighted, and carries out sound report
It is alert, and rate limitation is carried out to the pure electric automobile according to pre-set velocity threshold value.
Wherein, described when the leakiness corresponds to severe and leaks in above scheme, control brake fluid system event
Barrier lamp light, carry out audible alarm, and according to pre-set velocity threshold value to the pure electric automobile carry out rate limitation the step of it
Afterwards, the method also includes:
After the travel speed of the pure electric automobile drops to the pre-set velocity threshold value, stop carrying out audible alarm.
Other side according to an embodiment of the present invention additionally provides a kind of brake fluid leakage processing dress of pure electric automobile
It sets, comprising:
Judgment module, the brake fluid for generating when the brake fluid system for receiving pure electric automobile is lower than a preset value
Standby signal when, judge whether anti-blocking brake system is in inactive state；
Leakiness obtains module, for judging that the anti-blocking brake system is in inactive shape when the judgment module
When state, the leakiness of brake fluid is obtained；
Leakage class determining module, for determining that the leakiness is corresponding and letting out according to pre-set grade threshold
Leak grade；
Operation executing module, for carrying out prompting operation predetermined according to the leakage class.
Wherein, in above scheme, the leakiness obtains module and includes:
Information acquisition unit, for obtaining the running state information of the pure electric automobile；
Computing unit, for using Radial Basis Function neural algorithm, information, obtains brake fluid according to the operation state
Leakiness.
Wherein, in above scheme, the running state information include: brake pedal be operated sagging stroke, braking step on
Vacuum degree and brake pedal when plate is operated in the vacuum booster of the pure electric automobile pure electric vehicle vapour when being operated
Amount of speed reduction of the vehicle within the unit time；
The computing unit includes:
Input quantity determines subelement, for according to the sagging stroke BPS, the vacuum degree P and the pure electric automobile
Amount of speed reduction Δ V within the unit time determines an input vector x=[BPS, P, Δ V]T；
Computation subunit, for the input vector to be inputted preset formula
Obtain the leakiness Leak, wherein w1~w7 is constant, and c1~c7 is predetermined known vector, and φ is diameter
To basic function.
Wherein, in above scheme, the grade threshold includes the first preset threshold and the second preset threshold, the leakage etc.
Grade includes that slight leakage, moderate leakage and severe leak three grades, wherein it is pre- that first preset threshold is less than described second
If threshold value；
The leakage class determining module includes:
First determination unit, for determining the leakage journey when the leakiness is less than first preset threshold
Degree corresponds to slight leakage；
Second determination unit for being greater than or equal to first preset threshold when the leakiness, and is less than described
When the second preset threshold, determine that the leakiness is leaked corresponding to moderate；
Third determination unit, described in determining when the leakiness is greater than or equal to second preset threshold
Leakiness is leaked corresponding to severe.
Wherein, in above scheme, the operation executing module includes:
First execution unit, for controlling brake fluid system failure when the leakiness corresponds to slight leakage
Lamp is lighted；
Second execution unit, for controlling brake fluid system failure when the leakiness corresponds to moderate and leaks
Lamp is lighted, and carries out audible alarm；
Third execution unit, for controlling brake fluid system failure when the leakiness corresponds to severe and leaks
Lamp is lighted, and carries out audible alarm, and carry out rate limitation to the pure electric automobile according to pre-set velocity threshold value.
Wherein, in above scheme, described device further include:
Abort unit, for stopping after the travel speed of the pure electric automobile drops to the pre-set velocity threshold value
Carry out audible alarm.
Other side according to an embodiment of the present invention additionally provides a kind of pure electric automobile, including entire car controller, institute
State the brake fluid leakage treating device that entire car controller includes pure electric automobile described above；
Wherein, the entire car controller is electrically connected with the brake fluid system of the pure electric automobile.
Wherein, in above scheme, the entire car controller respectively with the vacuum pump and arrangement on the pure electric automobile
In the vacuum pressure sensor electrical connection on vacuum booster.
The beneficial effect of the embodiment of the present invention is:
The embodiment of the present invention generates brake fluid mentioning lower than preset value by the brake fluid system in pure electric automobile
Show signal, and when anti-blocking brake system is in inactive state, obtains the leakiness of brake fluid, and according to pre-set
Grade threshold determines the corresponding leakage class of leakiness, operates, makes to execute prompting predetermined according to leakage class
The severity of brake fluid leakage can be understood in time by obtaining driver, so that corresponding measure is taken to solve brake fluid leakage problem,
Promote travel safety.
Detailed description of the invention
Fig. 1 shows the flow charts of the brake fluid of the pure electric automobile of first embodiment of the invention leakage processing method；
Fig. 2 indicates to obtain algorithm schematic diagram used by brake fluid leakiness in first embodiment of the invention；
Fig. 3 indicate second embodiment of the invention pure electric automobile brake fluid leakage treating device structural block diagram it
One；
Fig. 4 indicate second embodiment of the invention pure electric automobile brake fluid leakage treating device structural block diagram it
Two；
Fig. 5 indicates the configuration diagram of the force aid system for braking in the pure electric automobile in third embodiment of the invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
First embodiment
One aspect according to an embodiment of the present invention provides a kind of brake fluid leakage processing method of pure electric automobile,
As shown in Figure 1, this method comprises:
Step 101: when brake fluid the mentioning lower than a preset value that the brake fluid system for receiving pure electric automobile generates
When showing signal, judge whether anti-blocking brake system is in inactive state.
Wherein, it is provided with buoy in the brake fluid oil pot of the brake fluid system in pure electric automobile, then when brake fluid oil
When brake fluid in pot is lower than preset value, buoy decline is to trigger switch, so that brake fluid system generates a standby signal,
Show that brake fluid leaks, needs to arouse attention.
Further, since anti-blocking brake system (ABS) work can impact the identification of brake fluid leak degree, therefore
In the embodiment of the present invention, before the identification for carrying out brake fluid leakiness, it is also necessary to judge whether ABS is in inactive shape
State is recognized when generating standby signal and ABS of the braking liquid level lower than preset value and starting without leak degree, until ABS
Stop intervention；If the standby signal and ABS that generate braking liquid level lower than preset value are in inactive state, brake fluid is carried out
Leak degree identification.
Step 102: when the anti-blocking brake system is in inactive state, obtaining the leakiness of brake fluid.
Preferably, step 102 includes: to obtain the running state information of the pure electric automobile；Using radial basis function mind
Through algorithm, information, obtains the leakiness of brake fluid according to the operation state.
Wherein, the buoy in brake fluid oil pot only can be realized the low detection of braking liquid level, be unable to as fuel tank
Detect Fuel Oil Remaining.And the leakage in the embodiment of the present invention, under the premise of not changing brake fluid oil pot structure, to brake fluid
Degree is inversely estimated.
In general, after brake fluid is lower than oil can lower limit (being lower than preset value), being driven in the case where ABS is inactive
The person's of sailing braking effect can be deteriorated, and braking distance will increase under equal conditions.Wherein, equal conditions are including in brake booster at this time
Vacuum degree and the sagging stroke etc. that is operated of brake pedal.From relation above as can be seen that with brake fluid reduction, making
Under the same conditions, the reduction amount of speed can drop the sagging stroke of dynamic booster internal vacuum and brake pedal in the unit time
It is low, i.e., the reduction amount braking of the sagging stroke, the car speed of unit time of vacuum degree, brake pedal inside brake booster
There is association between this in liquid leakiness.
Wherein, since there is complicated non-linear relations between above four, so can not pass through mathematical model carries out letter
Single description.However, neural network method has naturally with nonlinear fundamental characteristics and for solving nonlinear problem
It the characteristics of advantage, and a kind of feed-forward type neural network of radial basis function (RBF) neural network as function admirable, can be any
Precision approaches arbitrary nonlinear function, and topological structure is compact, has global approximation capability, while solving backpropagation
(BP) the local optimum problem of network.Therefore, the embodiment of the present invention uses RBF neural, is providing current brake power-assisted
The sagging stroke of vacuum degree, brake pedal in device and in the unit time under conditions of amount of speed reduction inversely estimation braked
The leakiness of liquid.
Further, the RBF neural that the embodiment of the present invention uses is divided into three layers, input layer, hidden layer and output layer,
Wherein input quantity is sink stroke BPS, vacuum degree P and the amount of speed reduction Δ V in the unit time, i.e. input quantity is three, then
The neuronal quantity of hidden layer seven, output quantity is leakiness.Wherein, the function expression of the algorithm are as follows:Wherein, x is input vector, i.e. x=[BPS, P, Δ V]T, wiFor weight, ci
For center vector, | | x-ci| | x vector is indicated to the distance of center vector, and φ is radial basis function.Preferably, reality of the invention
It applies in example, φ is taken as Gaussian radial basis function.In addition, for above-mentioned formula, wiAnd ciIt is given data, then as shown in Figure 2 will
Sagging stroke BPS, vacuum degree P and the amount of speed reduction Δ V in the unit time input RBF neural, then can obtain corresponding
Leakiness.
Wherein, the weight of above-mentioned formula and center vector are determined by the training of neural network.Specific training process is as follows:
Firstly, the leak degree to brake fluid quantifies, defines brake fluid under vehicle stationary state and drop to brake fluid
Leakiness when oil can scale lower limit, i.e. brake fluid are lower than preset value is 0, leakage journey when brake fluid is put net completely by definition
Degree is 100%, i.e., brake fluid bleeder valve is opened when brake fluid leak degree is 0, is put only until by brake fluid, corresponding leakage degree
It is 100%, records the brake fluid amount of releasing, enabling the value is V1eakIf brake fluid is added to brake fluid oil pot at this time, and (liquid volume added exists
[0, Vleak] between) calculation formula of then leak degree are as follows:Wherein, LbrkIndicate system
Liquid measure in hydrodynamic oil can.
Then, the liquid measure L in brake fluid oil pot is presetbrkDifferent numerical value is taken, then basisIt calculates and obtains multiple leakiness values.
Then, the sagging row that the vacuum degree P inside brake booster takes different numerical value and brake pedal is preset
Journey BPS takes different numerical value, to obtain by real steering vectors in each group of data [BPS, P, Leak], vehicle is in unit
Interior amount of speed reduction Δ V.
Finally, each group of data [BPS, P, Δ V, Leak] of acquisition instructs RBF neural as basic data
Practice, so that it is determined that the weight w of above-mentioned formula outiWith center vector ci, wherein by the nerve of hidden layer in an embodiment of the present invention
First quantity seven, so, weight includes w1~w7, center vector includes c1~c7。
Wherein, the RBF neural as applied by the embodiment of the present invention is that training is completed in advance, and there is no real-times to ask
Sagging stroke that topic, and in actual application according to the running state information of pure electric automobile, i.e. brake pedal are operated,
Vacuum degree and brake pedal when brake pedal is operated in the vacuum booster of the pure electric automobile are described pure when being operated
Amount of speed reduction of the electric car within the unit time, it will be able to the leakiness of brake fluid is quickly calculated, it is convenient and efficient.
Step 103: according to pre-set grade threshold, determining the corresponding leakage class of the leakiness.
Wherein, the grade threshold includes the first preset threshold and the second preset threshold, and the leakage class includes slight
Leakage, moderate leakage and severe leak three grades, wherein first preset threshold is less than second preset threshold；It is excellent
Selection of land, step 103 include: to determine that the leakiness corresponds to when the leakiness is less than first preset threshold
Slight leakage；When the leakiness is greater than or equal to first preset threshold, and is less than second preset threshold, really
The fixed leakiness is leaked corresponding to moderate；When the leakiness is greater than or equal to second preset threshold, determine
The leakiness is leaked corresponding to severe.
In addition, the grade threshold is not limited to include above-mentioned two threshold value, then leakage class is not limited to include upper
State three grades.
In an embodiment of the present invention, it is basic herein after the leak degree of brake fluid is calculated by RBF neural
On with the caused security risk of brake fluid leakage (brake fluid will cause braking distance when leaking increase even braking lose) be
According to being classified to leakiness, respectively slight leakage, moderate leakage and severe leakage.Although the leakage of its mild or moderate indicates
Brake fluid has leaked at this time, but does not cause substantive harm to traffic safety, for example, brake fluid system is slowly to seep at this time
Property is revealed out, and without open leak source, while braking distance will not obviously increase；Moderate leakage indicates there is one to traffic safety
Fixing ring, as braking distance increase, but at this time hydraulic system leakage still fall within exudative type, without obvious leak source；Severe leakage indicates
There is more serious safety hazard to driving at this time, i.e. braking distance obviously increases, and hydraulic system has obvious leak point at this time
(since oil pressure increases in such as braking process, brake fluid is obviously leaked).Wherein the leak condition of predetermined brake liquid is merely able to by light
Degree leakage is unable to inverse change to moderate and severe leakage development, cannot reveal variation by moderate such as slight leakage.
Step 104: according to the leakage class, carrying out prompting operation predetermined.
Wherein, the leakage class includes that slight leakage, moderate leakage and severe leak three grades, then preferably, step
Rapid 104 include: when the leakiness corresponds to slight leakage, and control brake fluid system trouble light is lighted；It is let out when described
When leakage degree corresponds to moderate leakage, control brake fluid system trouble light is lighted, and carries out audible alarm；When the leakage journey
When degree corresponds to severe leakage, control brake fluid system trouble light is lighted, and carries out audible alarm, and according to pre-set velocity threshold value
Rate limitation is carried out to the pure electric automobile.
That is, in an embodiment of the present invention, when brake fluid is in slight leakage rank, traffic safety is influenced slightly,
Hydraulic system can work normally at this time, therefore remove light brake fluid system trouble light to driver's progress in this case
Prompt is outer not to be needed to carry out active control to vehicle, drives impression to prevent from influencing driver.
When brake fluid is in moderate leakage rank, there is certain influence to traffic safety, if braking distance has slight increase,
But hydraulic system can work normally (hydraulic system can generate enough pressure when braking) substantially at this time, therefore in such case
Under also needed in addition to lighting braking system faults lamp further through audible alarm mode (such as short ring alarm) prompt driver, with
Improve the degree of safety of driving.
When brake fluid reach severe leakage rank when, have more serious harm to traffic safety, as braking distance have it is larger
Increase, while hydraulic system can not work normally (hydraulic system can not generate enough pressure when braking), because
This also needs further to prompt driver by audible alarm mode in this case in addition to lighting braking system faults lamp, together
When the most high speed of vehicle is limited, to guarantee traffic safety.Wherein, impression is driven in order to further provide for multiplying for driver,
It can stop carrying out audible alarm after the speed of vehicle is limited in pre-set velocity speed threshold value or less.
In conclusion the embodiment of the present invention, is in when receiving standby signal and ABS of the braking liquid level lower than preset value
When inactive state, under the premise of not changing the brake fluid testing agency of brake fluid oil pot, using RBF neural to braking
Liquid leakage situation carries out backstepping, obtains the leak degree of brake fluid, and security risk caused according to leakage on this basis
Different processing methods is classified and provided to brake fluid leak degree, is reminded by instrument fault lamp, audible alarm mode
Driver also carries out active control to vehicle by limitation max. speed mode after leakiness reaches certain rank, to reach
To the purpose for improving traffic safety.
Second embodiment
The embodiment provides a kind of brake fluid leakage treating devices of pure electric automobile, as shown in figure 3, the dress
Setting 300 includes:
Judgment module 301, the brake fluid for generating when the brake fluid system for receiving pure electric automobile are pre- lower than one
If judging whether anti-blocking brake system is in inactive state when the standby signal of value；
Leakiness obtains module 302, for judging that the anti-blocking brake system is in not when the judgment module 301
When starting state, the leakiness of brake fluid is obtained；
Leakage class determining module 303, for determining that the leakiness is corresponding according to pre-set grade threshold
Leakage class；
Operation executing module 304, for carrying out prompting operation predetermined according to the leakage class.
Preferably, as shown in figure 4, leakiness acquisition module 302 includes:
Information acquisition unit 3021, for obtaining the running state information of the pure electric automobile；
Computing unit 3022, for using Radial Basis Function neural algorithm, information, obtains braking according to the operation state
The leakiness of liquid.
Preferably, when the running state information includes: that the brake pedal sagging stroke, the brake pedal that are operated are operated
Vacuum degree and brake pedal in the vacuum booster of the pure electric automobile when being operated the pure electric automobile in unit
Interior amount of speed reduction；As shown in figure 4, the computing unit 3022 includes:
Input quantity determines subelement 30221, for according to the sagging stroke BPS, the vacuum degree P and the pure electric vehicle
Amount of speed reduction Δ V of the automobile within the unit time determines an input vector x=[BPS, P, Δ V]T；
Computation subunit 30222, for the input vector to be inputted preset formula Obtain the leakiness Leak, wherein w1~w7 is constant, and c1~c7 is predetermined known
Vector, φ are radial basis function.
Preferably, the grade threshold includes the first preset threshold and the second preset threshold, and the leakage class includes light
Degree leakage, moderate leakage and severe leak three grades, wherein first preset threshold is less than second preset threshold；
As shown in figure 4, the leakage class determining module 303 includes:
First determination unit 3031, for being let out described in determination when the leakiness is less than first preset threshold
Leakage degree corresponds to slight leakage；
Second determination unit 3032 for being greater than or equal to first preset threshold when the leakiness, and is less than
When second preset threshold, determine that the leakiness is leaked corresponding to moderate；
Third determination unit 3033, for determining when the leakiness is greater than or equal to second preset threshold
The leakiness is leaked corresponding to severe.
Preferably, as shown in figure 4, the operation executing module 304 includes:
First execution unit 3041, for controlling brake fluid system when the leakiness corresponds to slight leakage
Trouble light is lighted；
Second execution unit 3042, for controlling brake fluid system when the leakiness corresponds to moderate and leaks
Trouble light is lighted, and carries out audible alarm；
Third execution unit 3043, for controlling brake fluid system when the leakiness corresponds to severe and leaks
Trouble light is lighted, and carries out audible alarm, and carry out rate limitation to the pure electric automobile according to pre-set velocity threshold value.
Preferably, as shown in figure 4, described device further include:
Abort unit 3044, for after the travel speed of the pure electric automobile drops to the pre-set velocity threshold value,
Stop carrying out audible alarm.
The brake fluid leakage treating device of the pure electric automobile of the embodiment of the present invention, is being received by judgment module 301
When the brake fluid that the brake fluid system of pure electric automobile generates is lower than the standby signal of a preset value, braking anti-lock system is judged
Whether system is in inactive state, so that triggering leakiness obtains mould when anti-blocking brake system is in inactive state
Block 302 obtains the leakiness of brake fluid, and then triggers leakage class determining module 303 according to pre-set grade threshold,
It determines the corresponding leakage class of the leakiness, enables operation executing module 304 according to the leakage class, carry out pre-
The prompting operation first defined.Therefore, the embodiment of the present invention enables to driver to understand the serious journey of brake fluid leakage in time
Degree promotes travel safety so that corresponding measure be taken to solve brake fluid leakage problem.
3rd embodiment
The embodiment provides a kind of pure electric automobile, including entire car controller, the entire car controller includes
The brake fluid leakage treating device of pure electric automobile described above；Wherein, the entire car controller and the pure electric automobile
Brake fluid system electrical connection.
Preferably, the entire car controller respectively with the vacuum pump on the pure electric automobile and be arranged in vacuum servo
Vacuum pressure sensor electrical connection on device.
Specifically, as shown in figure 5, the brake fluid leakage processing method of pure electric automobile in above-described embodiment be suitable for
Lower force aid system for braking, the system include: entire car controller, electric vacuum pump, vacuum tank, vacuum booster, vacuum pressure biography
Sensor and brake fluid system.The force aid system for braking uses integrated control scheme, i.e., by entire car controller directly to electronic true
Sky pump carries out control and fault diagnosis, special controller for vacuum pump is omitted, the program not only reduces system cost, simultaneously
Due to improving the integrated level of system, the reliability of system is improved to a certain extent.
Wherein, as shown in figure 5, the first vacuum tube 501, the second vacuum tube 502 and third vacuum tube 503 form a threeway
Vacuum tube, and the port of the first vacuum tube 501 is connect with electric vacuum pump, the port of the second vacuum tube 502 and vacuum servo
Device connection, the port of third vacuum tube 503 connect with vacuum tank, is respectively set on the first vacuum tube 501 and the second vacuum tube 502
There is a check valve 2, so that when Motorized vacuum pump work vacuum tank and vacuum booster can be extracted by two check valves 2
Internal air provides vacuum degree guarantee.
In addition, vacuum pressure sensor is disposed on vacuum booster, brake boost demand is provided for driver.Vacuum
Tank provides vacuum degree deposit for entire force aid system, and especially when electric vacuum pump does not work, the vacuum degree in vacuum tank can
Brake boost demand is provided for driver.Brake fluid system and vacuum booster cooperate, and establish brake system pressure, most
Brake caliper piston work is pushed eventually, realizes vehicle braking function.Wherein, when the brake fluid in brake fluid oil pot drops to lower limit
When, brake fluid system sends the standby signal that braking liquid level is lower than preset value to entire car controller, for entire car controller
Corresponding strategies execute.
Specifically, standby signal of the brake fluid system by brake fluid lower than preset value is sent to entire car controller, so that
Entire car controller can further judge whether ABS is in inactive state, and when ABS is in inactive state, obtain system
The sagging stroke that dynamic pedal is operated and the amount of speed reduction within the unit time, and vacuum is obtained by vacuum pressure sensor
Vacuum degree in booster, thus according to sagging stroke, amount of speed reduction and vacuum degree in the unit time, using preparatory training
The RBF neural of completion calculates the leakiness for obtaining brake fluid, and then according to pre-set grade threshold, determination is let out
The corresponding leakage class of leakage degree, and trouble light, audible alarm etc. are controlled according to leakage class, carry out prompt operation.
It can be seen from the above, the pure electric automobile of the embodiment of the present invention, is omitted special controller for vacuum pump, passes through vehicle
Controller completes the control and fault diagnosis to electric vacuum pump, improves level of integrated system, reduces costs, and can make
Hydrodynamic is lower than preset value, and when ABS is in inactive state, obtains the leakiness of brake fluid, and according to pre-set etc.
Grade threshold value, determines the corresponding leakage class of leakiness, operates to execute prompting predetermined according to leakage class, so that
Driver can understand the severity of brake fluid leakage in time, so that corresponding measure be taken to solve brake fluid leakage problem, mention
Travel safety is risen, and then promotes the competitiveness of product in market.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come
It says, can also make several improvements and retouch under the premise of not departing from principle of the present invention, these improvements and modifications also exist
In protection scope of the present invention.
Claims (10)
1. a kind of brake fluid of pure electric automobile leaks processing method characterized by comprising
When the brake fluid that the brake fluid system for receiving pure electric automobile generates is lower than the standby signal of a preset value, judgement
Whether anti-blocking brake system is in inactive state；
When the anti-blocking brake system is in inactive state, the leakiness of brake fluid is obtained；
According to pre-set grade threshold, the corresponding leakage class of the leakiness is determined；
According to the leakage class, prompting operation predetermined is carried out；
The step of leakiness for obtaining brake fluid, comprising:
Obtain the running state information of the pure electric automobile；
Using Radial Basis Function neural algorithm, information, obtains the leakiness of brake fluid according to the operation state；
The running state information includes: pure electric vehicle when brake pedal sagging stroke, the brake pedal that are operated are operated
Vacuum degree and brake pedal in the vacuum booster of automobile speed of the pure electric automobile within unit time when being operated
Reduction amount；
Described to use Radial Basis Function neural algorithm, information, obtains the step of the leakiness of brake fluid according to the operation state
Suddenly, comprising:
One is determined according to the sagging stroke, the amount of speed reduction of the vacuum degree and the pure electric automobile within the unit time
Input vector, wherein x=[BPS, P, Δ V]T, x indicates the input vector, and BPS indicates the sagging stroke, described in P expression
Vacuum degree, Δ V indicate amount of speed reduction of the pure electric automobile within the unit time；
The input vector is inputted into preset formula, obtain the leakage journey
Degree, wherein Leak indicates the leakiness, w1~w7It is constant, c1~c7It is predetermined known vector, φ is
Radial basis function.
2. the method according to claim 1, wherein the grade threshold includes that the first preset threshold and second are pre-
If threshold value, the leakage class includes that slight leakage, moderate leakage and severe leak three grades, wherein described first is default
Threshold value is less than second preset threshold；
It is described according to pre-set grade threshold, the step of determining the leakiness corresponding leakage class, comprising:
When the leakiness is less than first preset threshold, determine that the leakiness corresponds to slight leakage；
When the leakiness is greater than or equal to first preset threshold, and is less than second preset threshold, institute is determined
Leakiness is stated to leak corresponding to moderate；
When the leakiness is greater than or equal to second preset threshold, determine that the leakiness is let out corresponding to severe
Leakage.
3. according to the method described in claim 2, progress is predetermined it is characterized in that, described according to the leakage class
The step of reminding operation, comprising:
When the leakiness corresponds to slight leakage, control brake fluid system trouble light is lighted；
When the leakiness, which corresponds to moderate, to be leaked, control brake fluid system trouble light is lighted, and carries out audible alarm；
When the leakiness, which corresponds to severe, to be leaked, control brake fluid system trouble light is lighted, and carries out audible alarm, and
Rate limitation is carried out to the pure electric automobile according to pre-set velocity threshold value.
4. according to the method described in claim 3, it is characterized in that, it is described when the leakiness correspond to severe leak when,
Control brake fluid system trouble light light, carry out audible alarm, and according to pre-set velocity threshold value to the pure electric automobile into
After the step of row rate limitation, the method also includes:
After the travel speed of the pure electric automobile drops to the pre-set velocity threshold value, stop carrying out audible alarm.
5. a kind of brake fluid leakage treating device of pure electric automobile characterized by comprising
Judgment module, brake fluid the mentioning lower than a preset value for being generated when the brake fluid system for receiving pure electric automobile
When showing signal, judge whether anti-blocking brake system is in inactive state；
Leakiness obtains module, for judging that the anti-blocking brake system is in inactive state when the judgment module
When, obtain the leakiness of brake fluid；
Leakage class determining module, for determining corresponding leakage of the leakiness etc. according to pre-set grade threshold
Grade；
Operation executing module, for carrying out prompting operation predetermined according to the leakage class；
The leakiness obtains module
Information acquisition unit, for obtaining the running state information of the pure electric automobile；
Computing unit, for using Radial Basis Function neural algorithm, information, obtains the leakage of brake fluid according to the operation state
Degree；
The running state information includes: pure electric vehicle when brake pedal sagging stroke, the brake pedal that are operated are operated
Vacuum degree and brake pedal in the vacuum booster of automobile speed of the pure electric automobile within unit time when being operated
Reduction amount；
The computing unit includes:
Input quantity determines subelement, is used for according to the sagging stroke, the vacuum degree and the pure electric automobile in unit
Interior amount of speed reduction determines an input vector, wherein x=[BPS, P, Δ V]T, the x expression input vector, BPS expression
The sagging stroke, P indicate the vacuum degree, and Δ V indicates amount of speed reduction of the pure electric automobile within the unit time；
Computation subunit, for the input vector to be inputted preset formula,
Obtain the leakiness, wherein Leak indicates the leakiness, w1~w7It is constant, c1~c7It is predetermined
Known vector, φ are radial basis function.
6. device according to claim 5, which is characterized in that the grade threshold includes that the first preset threshold and second are pre-
If threshold value, the leakage class includes that slight leakage, moderate leakage and severe leak three grades, wherein described first is default
Threshold value is less than second preset threshold；
The leakage class determining module includes:
First determination unit, for determining the leakiness pair when the leakiness is less than first preset threshold
It should be in slight leakage；
Second determination unit for being greater than or equal to first preset threshold when the leakiness, and is less than described second
When preset threshold, determine that the leakiness is leaked corresponding to moderate；
Third determination unit, for determining the leakage when the leakiness is greater than or equal to second preset threshold
Degree is leaked corresponding to severe.
7. device according to claim 6, which is characterized in that the operation executing module includes:
First execution unit, for controlling brake fluid system trouble light point when the leakiness corresponds to slight leakage
It is bright；
Second execution unit, for controlling brake fluid system trouble light point when the leakiness corresponds to moderate and leaks
It is bright, and carry out audible alarm；
Third execution unit, for controlling brake fluid system trouble light point when the leakiness corresponds to severe and leaks
It is bright, audible alarm is carried out, and rate limitation is carried out to the pure electric automobile according to pre-set velocity threshold value.
8. device according to claim 7, which is characterized in that described device further include:
Abort unit is carried out for stopping after the travel speed of the pure electric automobile drops to the pre-set velocity threshold value
Audible alarm.
9. a kind of pure electric automobile, which is characterized in that including entire car controller, the entire car controller include as claim 5 ~
The brake fluid leakage treating device of pure electric automobile described in 8 any one；
Wherein, the entire car controller is electrically connected with the brake fluid system of the pure electric automobile.
10. pure electric automobile according to claim 9, which is characterized in that the entire car controller respectively with the pure electricity
Vacuum pump on electrical automobile and the vacuum pressure sensor being arranged on vacuum booster electrical connection.
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| CN108506740B (en) * | 2018-04-26 | 2020-02-14 | 南京缔尔达智能科技有限公司 | Method and system for determining leakage area of liquid pipeline based on flow velocity meter |
| CN112776789B (en) * | 2019-11-08 | 2022-07-15 | 广州汽车集团股份有限公司 | Brake vacuum power system leakage diagnosis method and system and storage medium |
| CN112109691B (en) * | 2020-03-26 | 2022-09-09 | 上汽通用五菱汽车股份有限公司 | Automobile brake fluid abnormity early warning system and method and computer readable storage medium |
| CN113815424B (en) * | 2020-06-19 | 2023-09-22 | 广州汽车集团股份有限公司 | Vehicle braking force control method, device and computer readable storage medium |
| CN111976694B (en) * | 2020-07-08 | 2021-07-06 | 嘉善新石器智牛科技有限公司 | Brake fluid leakage detection method and device and unmanned vehicle |
| CN115214588B (en) * | 2021-12-02 | 2023-07-25 | 广州汽车集团股份有限公司 | Alarm method and device for braking system and vehicle |
| CN114312707B (en) * | 2021-12-16 | 2022-11-01 | 东风汽车集团股份有限公司 | ADAS visual perception-based electric vacuum pump control method, system and medium |
| CN114212070A (en) * | 2021-12-31 | 2022-03-22 | 如果科技有限公司 | Fault detection processing method for electric vehicle brake power-assisted system |
| CN115009252B (en) * | 2022-07-20 | 2023-09-26 | 阿维塔科技(重庆)有限公司 | Braking method and device |
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