CN104848920A - Method and device for measuring liquid level height and water sucking amount of brake liquid - Google Patents
Method and device for measuring liquid level height and water sucking amount of brake liquid Download PDFInfo
- Publication number
- CN104848920A CN104848920A CN201510128979.5A CN201510128979A CN104848920A CN 104848920 A CN104848920 A CN 104848920A CN 201510128979 A CN201510128979 A CN 201510128979A CN 104848920 A CN104848920 A CN 104848920A
- Authority
- CN
- China
- Prior art keywords
- brake fluid
- liquid level
- voltage difference
- water absorbing
- absorbing capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a method and device for measuring the liquid level height and water sucking amount of brake liquid. The method includes the steps that firstly, the brake liquid is electrically connected with the positive/negative electrode of a constant voltage difference source, and a first circuit is formed; secondly, a fixed end and a sliding end of a slide rheostat are eclectically connected with the positive/negative electrode of the constant voltage difference source, and a second circuit is formed; thirdly, the sliding end is connected with a floater floating on the liquid surface of the brake liquid, and the floater can drive the sliding end to slide along with vertical flotation of the liquid surface to change the resistance value of the slide rheostat; fourthly, whether current passes the brake liquid is detected, if yes, the fifth and sixth steps are carried out, and if not, the fifth step is carried out; fifthly, the liquid surface height is determined according to the resistance value of the slide rheostat connected with the second circuit; sixthly, the water sucking amount of the brake liquid is determined according to the resistance value of the brake liquid. The method and device can monitor the liquid level height and water sucking degree of the brake liquid in real time so that a driver can accurately know the current work conditions of the brake liquid.
Description
Technical field
The present invention relates to a kind of measuring method and device, particularly relate to and a kind ofly measure the liquid level of brake fluid and the method for water absorbing capacity and device.
Background technology
Passenger car utilizes the brake fluid in brake system to transmit brake pressure in braking procedure, and brake fluid is stored in fluid reservoir usually, is communicated with air by the airport of liquid storage cover.Because the factors such as the wearing and tearing of friction disc or line rupture protection valve there will be brake fluid quantity not sufficient after using a period of time.If brake fluid liquid measure is not enough, air can be made to enter brake system.Because air is compressible, it will have a strong impact on the rising of hydraulic pressure, cause detent to react insensitive even complete failure, cause great potential safety hazard.
In addition, brake fluid has extremely strong water absorptivity.After brake fluid enters moisture, can reduce its equilibrium reflux boiling point, in braking procedure, produce high temperature because of friction cause moisture to be vaporized, gas is compressed in brake fluid, very easily causes braking to subtract effect and even loses efficacy.And due to the moisture-absorption characteristics of brake fluid make the moisture in brake fluid with annual about 4% speed increase, significantly reduce the performance of brake fluid.The appearance of above situation will bring very large safe hidden danger to running car.
Therefore, in order to ensure that the driving safety of automobile had both needed to check brake fluid liquid measure, also needing to monitor its water cut, to ensure that brake fluid is in good condition, realizing excellent braking effect.
Existing brake fluid liquid inspection device is electromagnetic type warning device.
As shown in Figure 1, the 1 ' horizontal line indicated represents liquid level, and what the dotted line of liquid level below 1 ' was illustrated is brake fluid 2 '.When brake fluid 2 ' is sufficient, the position of float 3 ' is higher, and now permanent magnet 4 ' is higher than the position of reed switch 5 ', and reed switch 5 ' is in off-state, and the circuit at alarm lamp 6 ' place disconnects, and alarm lamp 6 ' does not work.When float 3 ' drops to below limit value along with liquid level, permanent magnet 4 ', just close to reed switch 5 ', is inhaled dynamic reed switch 5 ' and is made it close, connect the circuit at alarm lamp 6 ' place, alarm lamp 6 ' luminous alarm.This brake fluid liquid inspection device at least has the following disadvantages:
1., because this device alarm only triggers lower than during limit value at brake fluid liquid level, now brake fluid significantly declines already and is mixed with air, there is brake safe hidden danger.
2. when brake fluid after absorbing water, when the not obvious or volume of volume change is not lower than liquid level limit value, this alarm device cannot trigger, and there is brake safe hidden danger.
3. this device only at brake fluid liquid level lower than driver during limit value, make driver cannot predict brake fluid liquid measure in advance not enough, if driver cannot supplement brake fluid when brake fluid is reported to the police, then there is brake safe hidden danger.
4. current most driver is not enough to the understanding of importance changing brake fluid, irregularly changes brake fluid and causes it to go bad, extreme influence braking ability.
5. this device cannot measure the water absorbing capacity of brake fluid, there is brake safe hidden danger.
Therefore wish a kind of technical scheme to overcome or at least to alleviate in the above-mentioned defect of prior art one or more.
Summary of the invention
The object of the present invention is to provide a kind of one or more liquid level of measurement brake fluid of overcoming or at least alleviate in the above-mentioned defect of prior art and the method for water absorbing capacity and device, it can monitor liquid measure height and the water sucting degree of brake fluid in real time, is conducive to the current working that driver accurately understands brake fluid.
For achieving the above object, the invention provides a kind of liquid level and the water absorbing capacity method of measuring brake fluid, it comprises the following steps: step S1: the positive/negative of brake fluid with constant voltage difference source be electrically connected, form the first circuit; Step S2: the positive/negative stiff end of slide rheostat and sliding end being electrically connected to described constant voltage difference source, forms second circuit; Step S3: described sliding end is connected with the float swimming in described brake fluid liquid level, described float can drive described sliding end to slide, to change the resistance of described slide rheostat along with fluctuating of described liquid level; Step S4: whether have electric current pass through, if having, enter step S5 and step 6 if detecting described brake fluid; Otherwise, then step S5 is entered; Step S5: be connected into the resistance value in described second circuit according to described slide rheostat, determines described liquid level; Step S6: according to the resistance value of described brake fluid, determines the water absorbing capacity of described brake fluid.
Further; in described step S4; the method whether detect described brake fluid has electric current to pass through is specially: the first protective resistance being connected in series predetermined resistance value on described first circuit; whether according to the voltage difference measuring the described first protective resistance two ends obtained, detecting described brake fluid has electric current to pass through.
Further; in described step S5; determine that the method for the height of described liquid level is specially: the second protective resistance being connected in series predetermined resistance value in described second circuit; be not connected into the voltage difference between the described stiff end of described second circuit and described sliding end in voltage difference between described slide rheostat two stiff ends obtained according to voltage difference and the measurement at the resistance value of described second protective resistance, two ends, described constant voltage difference source and described slide rheostat, obtain described liquid level.
Further; in described step S6; determine that the method for the water absorbing capacity of described brake fluid is specially: the voltage difference at the described first protective resistance two ends that voltage difference and measurement according to the resistance value of described first protective resistance, two ends, described constant voltage difference source obtain, obtains the water absorbing capacity of described brake fluid.
Further, also comprise: step S7: when described liquid level is lower than setting threshold value, send alerting signal.
Further, also comprise: step S8: when the water absorbing capacity of described brake fluid is higher than setting threshold value, send alerting signal.
Measure liquid level and the water absorbing capacity device of brake fluid, it comprises: float, and its one end free-floating is at the liquid level of brake fluid, and the other end can move up and down along the axis of brake fluid hold-up vessel along with fluctuating of described liquid level; Constant voltage difference source, its positive/negative is electrically connected to brake fluid, forms the first circuit; And slide rheostat, its stiff end and sliding end are electrically connected to the positive/negative in described constant voltage difference source, form second circuit; Described sliding end is connected with described float, and fluctuating of described float can drive described sliding end to slide and change the resistance of described slide rheostat; Described liquid level is determined based on the described slide rheostat resistance value be connected in described second circuit; Resistance value based on described brake fluid determines the water absorbing capacity of described brake fluid.
Further, described first circuit also comprises the first protective resistance of predetermined resistance value, and it is connected in series with described brake fluid.
Further, described second circuit also comprises the second protective resistance of serial connection predetermined resistance value wherein.
Further, also comprise voltage sensor, for measuring in the voltage difference between described slide rheostat two stiff ends, described slide rheostat the voltage difference not being connected into voltage difference between the described stiff end of described second circuit and described sliding end and described first protective resistance two ends; Be not connected into the voltage difference between the described stiff end of described second circuit and described sliding end in voltage difference between described slide rheostat two stiff ends obtained according to voltage difference and the measurement at the resistance value of described second protective resistance, two ends, described constant voltage difference source and described slide rheostat, obtain described liquid level; The voltage difference at the described first protective resistance two ends obtained according to voltage difference and the measurement at the resistance value of described first protective resistance, two ends, described constant voltage difference source, obtains the water absorbing capacity of described brake fluid.
Further, also comprise panel board, it is for showing liquid level and the water absorbing capacity of described brake fluid.
Further, also comprise panalarm, described brake fluid liquid level lower than setting threshold value time or described brake fluid water absorbing capacity higher than setting threshold value time, send alerting signal.
Because the positive/negative of brake fluid with constant voltage difference source is electrically connected by the present invention, also the stiff end of slide rheostat and sliding end are electrically connected to the positive/negative in constant voltage difference source, and sliding end is connected with the float swimming in brake fluid liquid level, float can drive sliding end to slide and changes the resistance of slide rheostat along with fluctuating of liquid level, the water absorbing capacity of the resistance value determination liquid level be connected into according to slide rheostat and the resistance value determination brake fluid according to brake fluid, therefore driver can learn the height of brake fluid liquid level at any time, in order to brake fluid of annotating in advance, avoid occurring that brake fluid is too low and cannot supplement the situation of brake fluid at once, driver can also be reminded to change brake fluid in time according to the water absorbing capacity of brake fluid simultaneously, thus guarantee braking ability, improve drive safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of brake fluid liquid inspection device in prior art;
The view of float in the brake fluid fluid reservoir that Fig. 2 is suitable for by the present invention;
Fig. 3 is the structural representation of the liquid level of measurement brake fluid provided by the present invention and device one embodiment of water absorbing capacity.
Reference numeral:
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
The structural representation of what Fig. 3 provided the is liquid level of measurement brake fluid provided by the present invention and device one embodiment of water absorbing capacity.Consult Fig. 3, the liquid level of measurement brake fluid in the present embodiment and the device of water absorbing capacity comprise float 4, constant voltage difference source Uo and slide rheostat Rx, wherein:
Shown in Fig. 2 be the present invention the view of float in the brake fluid fluid reservoir that is suitable for.As shown in Figure 2, float 4 is arranged in brake fluid fluid reservoir 2, one end free-floating of float 4 is on the liquid level of brake fluid 3, and the other end is fixed on fluid reservoir cylinder cap 1, and float 4 can move up and down along the axis of the cylinder cap 1 of brake fluid hold-up vessel 2 along with fluctuating of described liquid level.
Positive pole/the negative pole of constant voltage difference source Uo is electrically connected to brake fluid 3 respectively by wire, forms the first circuit.When brake fluid 3 does not absorb water time, brake fluid 3 is non-conductive, and now the first circuit is obstructed, is open circuit.After brake fluid 3 absorbs water, brake fluid 3 conducts electricity, and now the first circuit is path.Be connected in series the first protective resistance Ri at the first circuit, and the resistance of the first protective resistance Ri is predetermined resistance value, that is the resistance of the first protective resistance Ri is known.
Slide rheostat Rx has the first stiff end A, the second stiff end B and sliding end S, and wherein, the first stiff end A and sliding end S is electrically connected to the positive pole/negative pole of constant voltage difference source Uo, forms second circuit.As can be seen from Figure 3, described first circuit and the parallel connection of described second circuit.
Second circuit also comprises the second protective resistance Rv of predetermined resistance value, and the second protective resistance Rv is serially connected in second circuit.The sliding end S of slide rheostat Rx is connected with float 4, float 4 controls the position of the sliding end S of slide rheostat Rx, and fluctuating of float 4 can drive the sliding end S of slide rheostat Rx slide and change the resistance value of the slide rheostat Rx be connected in second circuit.
Because brake fluid 3 is connected with the positive pole/negative electricity in constant voltage difference source by the present invention, also the stiff end A of slide rheostat Rx and sliding end S is electrically connected to the positive pole/negative pole in constant voltage difference source, and sliding end S is connected with the float 4 swimming in brake fluid liquid level, float 4 can drive sliding end S to slide and changes the resistance of slide rheostat along with fluctuating of liquid level, the resistance value determination liquid level be connected into according to slide rheostat Rx and the water absorbing capacity determining brake fluid 3 according to the resistance value Rw of brake fluid 3, therefore driver can learn the height of brake fluid 3 liquid level at any time, in order to brake fluid 3 of annotating in advance, avoid occurring that brake fluid 3 is too low and cannot supplement the situation of brake fluid 3 at once, driver can also be reminded to change brake fluid 3 in time according to the water absorbing capacity of brake fluid 3 simultaneously, thus guarantee braking ability, improve drive safety.
Device provided by the present invention also comprises voltage sensor (not shown), for measuring in voltage difference U f, the slide rheostat Rx between slide rheostat Rx two stiff ends (the first stiff end A and the second stiff end B) the voltage difference U i not being connected into voltage difference U e between the second stiff end B of described second circuit and sliding end S and the first protective resistance Ri two ends.The voltage difference U e be not connected in above-mentioned slide rheostat Rx between the second stiff end B of described second circuit and sliding end S comes from the voltage difference that the contact resistance Ru that himself formed produces, and is the voltage at contact resistance Ru two ends.
Voltage difference U f between slide rheostat Rx two stiff ends obtained according to the resistance value of the second protective resistance Rv, the voltage difference U o at two ends, constant voltage difference source and measurement and the voltage U e at contact resistance Ru two ends; obtain the resistance value of slide rheostat Rx, thus obtain described liquid level.
The voltage difference U i at the first protective resistance Ri two ends obtained according to the resistance value of the first protective resistance Ri, the voltage difference U o at two ends, constant voltage difference source and measurement, obtains the resistance value of brake fluid Rw, thus obtains the water absorbing capacity of described brake fluid.
The liquid level of measurement brake fluid that above-described embodiment provides and the course of work of the device of water absorbing capacity as follows:
1. when brake fluid 3 does not absorb water:
Because brand-new brake fluid is non-conductive, therefore brake fluid 3 place first circuit is open circuit, the voltage difference U i=0 at the first protective resistance Ri two ends that voltage sensor measurement obtains.
As shown in Figure 3, the liquid level of brake fluid 3 is higher, and the resistance Rx being connected to the resistance value in second circuit is less, otherwise larger.
If circuital current is I, the voltage difference U f at contact resistance Ru and slide rheostat Rx two ends is:
Uf＝(Rx+Ru)*I (1)
The voltage difference U e at contact resistance Ru two ends is:
Ue＝Ru*I (2)
And: I=(Uo-Uf)/Rv (3)
Then: Rx=(Uf-Ue)/I=(Uf-Ue) * Rv/ (Uo-Uf) (4)
In various: the resistance of the second protective resistance Rv is predetermined resistance value, i.e. known resistance; The voltage difference of constant voltage difference source Uo is known fixed, and the voltage difference U f at contact resistance Ru and slide rheostat Rx two ends and the voltage difference U e at contact resistance Ru two ends obtains by voltage sensor measurement.
The liquid level of the resistance value determination brake fluid 3 in second circuit is connected into based on slide rheostat Rx, such as slide rheostat Rx is connected into resistance value input ECU (the Engineer ProcureConstruct in second circuit, control unit of engine), can judge that slide rheostat Rx is connected into the relation of the liquid measure of resistance value in second circuit and brake fluid 3 by ECU, and then obtain the liquid level of brake fluid 3.
2. after brake fluid 3 absorbs water:
Because of the increase along with brake fluid water absorbing capacity, its conductive capability improves, therefore brake fluid place first circuit is path, if the electric current that this section of circuit passes through is set to I1 (I2 is changing value), if whole circuit total current is I, the electric current giving slide rheostat Rx place second circuit is set to I2.
Then as shown in Figure 3:
I＝I1+I2 (5)
The voltage difference U f at contact resistance Ru and slide rheostat Rx two ends is:
Uf＝(Rx+Ru)*I2 (6)
The voltage difference U e at contact resistance Ru two ends is:
Ue＝Ru*I2 (7)
And: I2=(Uo-Uf)/Rv (8)
Then: Rx=(Uf-Ue)/I2=(Uf-Ue) * Rv/ (Uo-Uf) (9)
The resistance value be connected in second circuit based on slide rheostat Rx determines described liquid level, such as slide rheostat Rx is connected into the resistance value input ECU in second circuit, can judge that slide rheostat Rx is connected into the relation of the liquid measure of resistance value in second circuit and brake fluid 3 by ECU, and then obtain the liquid level of brake fluid 3.
Due to I1=Ui/Ri (10)
Then the resistance Rw of brake fluid 3 is:
Rw＝(Uo-Ui)/I1＝(Uo-Ui)*Ri/Ui (11)
In various: Ui obtains by voltage sensor measurement, the resistance of the first protective resistance Ri is predetermined resistance value, i.e. known resistance, and the voltage difference of constant voltage difference source Uo is known fixed.
Based on the water absorbing capacity of the resistance value determination brake fluid 3 of brake fluid 3, such as by the resistance value of brake fluid 3 input ECU, by the resistance value of brake fluid 3, the water absorbing capacity of brake fluid 3 can be judged by ECU.
As can be seen from (11) formula, the resistance Rw of brake fluid 3 of the present invention and the resistance of contact resistance Ru have nothing to do, and therefore can eliminate the impact of contact resistance Ru, make measurement result more accurate.
Device provided by the present invention also comprises panel board and panalarm, and it is for showing liquid level and the water absorbing capacity of brake fluid 3, therefore can intuitively and accurately by panel board observation brake fluid liquid level.Driver can observe the liquid level of brake fluid 3 at any time, in order to brake fluid 3 of annotating in advance, avoids occurring that brake fluid 3 is too low and cannot supplement the situation of brake fluid 3 at once.
Panalarm can be arranged on the pilot lamp on panel board, when the liquid level of brake fluid 3 is lower than setting threshold value, or, when the water absorbing capacity of brake fluid 3 is higher than setting threshold value (as 8%), panalarm sends alerting signal, i.e. pilot lamp flicker, therefore prompting driver can change brake fluid 3 after brake fluid 3 absorbs water and when affecting braking ability thus.
According to above-mentioned principle of work, as shown in Figure 3, the liquid level of measurement brake fluid provided by the present invention and water absorbing capacity method comprise the following steps:
Step S1: brake fluid is electrically connected with positive pole ("+" shown in Fig. 3)/negative pole ("-" shown in Fig. 3) in constant voltage difference source, forms the first circuit.The voltage difference in the constant voltage difference source shown in Fig. 3 is Uo.
Step S2: positive pole ("+" shown in Fig. 3)/negative pole ("-" shown in Fig. 3) the stiff end A of slide rheostat Rx and sliding end S being electrically connected to described constant voltage difference source, forms second circuit.
Step S3: be connected with the float 4 swimming in brake fluid 3 liquid level by the sliding end S of slide rheostat Rx, float 4 can drive the sliding end S of slide rheostat to slide, to change the resistance of slide rheostat along with fluctuating of brake fluid 3 liquid level.As shown in Figure 2, float 4 is arranged in brake fluid fluid reservoir 2, one end free-floating of float 4 is on the liquid level of brake fluid 3, and the other end is fixed on fluid reservoir cylinder cap 1, and float 4 can move up and down along the axis of the cylinder cap 1 of brake fluid hold-up vessel 2 along with fluctuating of described liquid level.
Step S4: whether have electric current pass through, if so, enter step S5 and step 6 if detecting brake fluid 3; Otherwise, then step S5 is entered.
Step S5: be connected into the resistance value in second circuit according to slide rheostat Rx, determines the liquid level of brake fluid 3.
Step S6: according to the resistance value Rw of brake fluid 3, determines the water absorbing capacity of described brake fluid.
Because brake fluid 3 is connected with the positive pole/negative electricity in constant voltage difference source by the present invention, also the stiff end A of slide rheostat Rx and sliding end S is electrically connected to the positive pole/negative pole in constant voltage difference source, and sliding end S is connected with the float 4 swimming in brake fluid liquid level, float 4 can drive sliding end S to slide and changes the resistance of slide rheostat along with fluctuating of liquid level, the resistance value determination liquid level be connected into according to slide rheostat Rx and the water absorbing capacity determining brake fluid 3 according to the resistance value Rw of brake fluid 3, therefore driver can learn the height of brake fluid 3 liquid level at any time, in order to brake fluid 3 of annotating in advance, avoid occurring that brake fluid 3 is too low and cannot supplement the situation of brake fluid 3 at once, driver can also be reminded to change brake fluid 3 in time according to the water absorbing capacity of brake fluid 3 simultaneously, thus guarantee braking ability, improve drive safety.
Because brand-new brake fluid 3 is non-conductive, therefore brake fluid 3 place first circuit is open circuit, the voltage difference U i=0 at the first protective resistance Ri two ends that voltage sensor measurement obtains; But because of the increase along with brake fluid water absorbing capacity, its conductive capability improves, therefore brake fluid place first circuit is path.Given this, in described step S4, the method whether detect brake fluid 3 has electric current to pass through can be specifically:
Described first circuit is connected in series the first protective resistance Ri of predetermined resistance value, and whether according to the voltage difference measuring the first protective resistance Ri two ends obtained, detecting brake fluid 3 has electric current to pass through.
According to above-mentioned formula (4) and formula (9): Rx=(Uf-Ue)/I=(Uf-Ue) * Rv/ (Uo-Uf), the resistance value that slide rheostat Rx is connected into circuit simultaneously with the resistance value of the second protective resistance Rv, voltage difference U f between the slide rheostat Rx that the voltage difference U o at two ends, constant voltage difference source and measurement obtain two stiff ends is relevant with the voltage U e at contact resistance Ru two ends, and the resistance value that the liquid level of brake fluid 3 and slide rheostat Rx are connected into circuit has corresponding relation, this corresponding relation can adopt other method known in those skilled in the art and suggested by the present invention to obtain.Therefore, in described step S5, determine that the method for the liquid level of brake fluid 3 can be specifically:
On described second circuit; the second protective resistance Rv of predetermined resistance value is connected in series at the stiff end A of slide rheostat Rx; voltage difference U f between slide rheostat Rx two stiff ends obtained according to the resistance value of the second protective resistance Rv, the voltage difference U o at two ends, constant voltage difference source and measurement and the voltage U e at contact resistance Ru two ends; by the computing formula of slide rheostat Rx; acquisition slide rheostat Rx is connected into the resistance value in second circuit, thus obtains the liquid level of brake fluid.
According to above-mentioned formula (11): Rw=(Uo-Ui)/I2=(Uo-Ui) * Ri/Ui, the resistance value Rw of brake fluid 3 is simultaneously relevant to the voltage difference U i at the first protective resistance Ri two ends that the resistance value of the first protective resistance Ri, the voltage difference U o at two ends, constant voltage difference source and measurement obtain.Therefore, in described step S6, determine that the method for the water absorbing capacity of brake fluid 3 can be specifically:
The voltage difference U i at the first protective resistance Ri two ends obtained according to the resistance value of the first protective resistance Ri, the voltage difference U o at two ends, constant voltage difference source and measurement; by the computing formula of the resistance value Rw of brake fluid 3; obtain the resistance value Rw of brake fluid 3, thus obtain the water absorbing capacity of brake fluid 3.
Provided by the present invention a kind of measure brake fluid liquid level and water absorbing capacity method also comprise:
Step S7: when the liquid level of brake fluid 3 is lower than setting threshold value, send alerting signal.
Provided by the present invention a kind of measure brake fluid liquid level and water absorbing capacity method also comprise:
Step S8: when the water absorbing capacity of brake fluid 3 is higher than setting threshold value, send alerting signal.
The brake fluid height measurement method that the present invention proposes, can monitor brake fluid height in real time, more intuitively, and hommization more.Simultaneously because the understanding of importance of most driver to periodic replacement brake fluid is not enough, do not change for a long time and cause brake fluid rotten and affect braking ability, bring great safety problem.The present invention can remind driver, thus ensures braking ability, improves drive safety.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. measure liquid level and the water absorbing capacity method of brake fluid, it is characterized in that, comprise the following steps:
Step S1: the positive/negative of brake fluid with constant voltage difference source is electrically connected, forms the first circuit;
Step S2: the positive/negative stiff end of slide rheostat and sliding end being electrically connected to described constant voltage difference source, forms second circuit;
Step S3: described sliding end is connected with the float swimming in described brake fluid liquid level, described float can drive described sliding end to slide, to change the resistance of described slide rheostat along with fluctuating of described liquid level;
Step S4: whether have electric current pass through, if having, enter step S5 and step 6 if detecting described brake fluid; Otherwise, then step S5 is entered;
Step S5: be connected into the resistance value in described second circuit according to described slide rheostat, determines described liquid level;
Step S6: according to the resistance value of described brake fluid, determines the water absorbing capacity of described brake fluid.
2. liquid level and the water absorbing capacity method measuring brake fluid as claimed in claim 1, it is characterized in that, in described step S4, the method whether detect described brake fluid has electric current to pass through is specially:
Described first circuit is connected in series the first protective resistance of predetermined resistance value, and whether according to the voltage difference measuring the described first protective resistance two ends obtained, detecting described brake fluid has electric current to pass through.
3. liquid level and the water absorbing capacity method measuring brake fluid as claimed in claim 1 or 2, is characterized in that, in described step S5, determine that the method for the height of described liquid level is specially:
The second protective resistance of predetermined resistance value is connected in series in described second circuit; be not connected into the voltage difference between the described stiff end of described second circuit and described sliding end in voltage difference between described slide rheostat two stiff ends obtained according to voltage difference and the measurement at the resistance value of described second protective resistance, two ends, described constant voltage difference source and described slide rheostat, obtain described liquid level.
4. liquid level and the water absorbing capacity method measuring brake fluid as claimed in claim 2, is characterized in that, in described step S6, determine that the method for the water absorbing capacity of described brake fluid is specially:
The voltage difference at the described first protective resistance two ends obtained according to voltage difference and the measurement at the resistance value of described first protective resistance, two ends, described constant voltage difference source, obtains the water absorbing capacity of described brake fluid.
5. liquid level and the water absorbing capacity method measuring brake fluid as claimed in claim 1, is characterized in that, also comprise:
Step S7: when described liquid level is lower than setting threshold value, send alerting signal.
6. liquid level and the water absorbing capacity method measuring brake fluid as claimed in claim 1, is characterized in that, also comprise:
Step S8: when the water absorbing capacity of described brake fluid is higher than setting threshold value, send alerting signal.
7. measure liquid level and the water absorbing capacity device of brake fluid, it is characterized in that, comprising:
Float, its one end free-floating is at the liquid level of brake fluid, and the other end can move up and down along the axis of brake fluid hold-up vessel along with fluctuating of described liquid level;
Constant voltage difference source, its positive/negative is electrically connected to brake fluid, forms the first circuit; And
Slide rheostat, its stiff end and sliding end are electrically connected to the positive/negative in described constant voltage difference source, form second circuit; Described sliding end is connected with described float, and fluctuating of described float can drive described sliding end to slide and change the resistance of described slide rheostat;
Described liquid level is determined based on the described slide rheostat resistance value be connected in described second circuit;
Resistance value based on described brake fluid determines the water absorbing capacity of described brake fluid.
8. liquid level and the water absorbing capacity device measuring brake fluid as claimed in claim 7, it is characterized in that, described first circuit also comprises the first protective resistance of predetermined resistance value, and it is connected in series with described brake fluid.
9. liquid level and the water absorbing capacity device measuring brake fluid as claimed in claim 8, it is characterized in that, described second circuit also comprises the second protective resistance of serial connection predetermined resistance value wherein.
10. liquid level and the water absorbing capacity device measuring brake fluid as claimed in claim 9, it is characterized in that, also comprise voltage sensor, for measuring in the voltage difference between described slide rheostat two stiff ends, described slide rheostat the voltage difference not being connected into voltage difference between the described stiff end of described second circuit and described sliding end and described first protective resistance two ends; Be not connected into the voltage difference between the described stiff end of described second circuit and described sliding end in voltage difference between described slide rheostat two stiff ends obtained according to voltage difference and the measurement at the resistance value of described second protective resistance, two ends, described constant voltage difference source and described slide rheostat, obtain described liquid level; The voltage difference at the described first protective resistance two ends obtained according to voltage difference and the measurement at the resistance value of described first protective resistance, two ends, described constant voltage difference source, obtains the water absorbing capacity of described brake fluid.
11. liquid level and the water absorbing capacity devices measuring brake fluid as claimed in claim 7, it is characterized in that, also comprise panel board, it is for showing liquid level and the water absorbing capacity of described brake fluid.
12. liquid level and the water absorbing capacity devices measuring brake fluid as claimed in claim 7, it is characterized in that, also comprise panalarm, described brake fluid liquid level lower than setting threshold value time or described brake fluid water absorbing capacity higher than setting threshold value time, send alerting signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510128979.5A CN104848920A (en) | 2015-03-24 | 2015-03-24 | Method and device for measuring liquid level height and water sucking amount of brake liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510128979.5A CN104848920A (en) | 2015-03-24 | 2015-03-24 | Method and device for measuring liquid level height and water sucking amount of brake liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104848920A true CN104848920A (en) | 2015-08-19 |
Family
ID=53848738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510128979.5A Pending CN104848920A (en) | 2015-03-24 | 2015-03-24 | Method and device for measuring liquid level height and water sucking amount of brake liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104848920A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181279A (en) * | 2015-09-29 | 2015-12-23 | 青岛歌尔声学科技有限公司 | Air tightness detection device |
| CN107478535A (en) * | 2016-12-02 | 2017-12-15 | 深圳市华威环保建材有限公司 | The detection method that a kind of recycled fine aggregate water absorption changes over time |
| CN112109691A (en) * | 2020-03-26 | 2020-12-22 | 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470001A (en) * | 2007-12-27 | 2009-07-01 | 英业达股份有限公司 | Method for automatically planning fuel filling route and its delivery vehicle |
| CN102338655A (en) * | 2010-07-22 | 2012-02-01 | 联合汽车电子有限公司 | Vehicle oil level sensor and implementation method thereof |
| CN102444445A (en) * | 2011-10-26 | 2012-05-09 | 潍柴动力股份有限公司 | Engine oil liquid level measuring device and method thereof |
| CN202403770U (en) * | 2012-01-13 | 2012-08-29 | 梁炽均 | Voice alarming device for fuel starvation of women motorcycle |
| CN103808762A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Rapid water content analyzer |
| CN104407021A (en) * | 2014-11-21 | 2015-03-11 | 广西智通节能环保科技有限公司 | Soil moisture content measuring device |
-
2015
- 2015-03-24 CN CN201510128979.5A patent/CN104848920A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470001A (en) * | 2007-12-27 | 2009-07-01 | 英业达股份有限公司 | Method for automatically planning fuel filling route and its delivery vehicle |
| CN102338655A (en) * | 2010-07-22 | 2012-02-01 | 联合汽车电子有限公司 | Vehicle oil level sensor and implementation method thereof |
| CN102444445A (en) * | 2011-10-26 | 2012-05-09 | 潍柴动力股份有限公司 | Engine oil liquid level measuring device and method thereof |
| CN202403770U (en) * | 2012-01-13 | 2012-08-29 | 梁炽均 | Voice alarming device for fuel starvation of women motorcycle |
| CN103808762A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Rapid water content analyzer |
| CN104407021A (en) * | 2014-11-21 | 2015-03-11 | 广西智通节能环保科技有限公司 | Soil moisture content measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 李海青 等: "《多相流检测技术进展》", 31 October 1996 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181279A (en) * | 2015-09-29 | 2015-12-23 | 青岛歌尔声学科技有限公司 | Air tightness detection device |
| CN105181279B (en) * | 2015-09-29 | 2018-06-26 | 青岛歌尔声学科技有限公司 | A kind of air-tightness detection device |
| CN107478535A (en) * | 2016-12-02 | 2017-12-15 | 深圳市华威环保建材有限公司 | The detection method that a kind of recycled fine aggregate water absorption changes over time |
| CN112109691A (en) * | 2020-03-26 | 2020-12-22 | 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104848920A (en) | Method and device for measuring liquid level height and water sucking amount of brake liquid | |
| CN108981850A (en) | Detect method, apparatus, probe, liquid level sensor and the vehicle of coolant liquid liquid level | |
| CN103376144A (en) | Liquid level detecting device | |
| CN102452319A (en) | Control method for automobile fuel gauge | |
| CN101426318A (en) | Detecting, alarming apparatus for LED direction indicating light, detecting, alarming method thereof | |
| US4244210A (en) | Combined fuel level and fuel consumption indicator | |
| CA2923678C (en) | Fuel filter device | |
| CN103499744A (en) | Electric automobile insulation resistance on-line monitoring method based on frequency response | |
| CN205836748U (en) | A kind of simple automobile protected against the effects of immersion device | |
| CN111148980A (en) | Method, system and graphical indicator for providing a lateral center of gravity of an aircraft | |
| CN205853779U (en) | Instrument system in segment encode screen display tire pressure | |
| US20180216983A1 (en) | Solid state fuel level sensor | |
| CN102087134A (en) | Photoelectric liquid level meter | |
| US4507657A (en) | Apparatus for determining various operational conditions of an aircraft | |
| CN209706898U (en) | A kind of oil of vehicle fuel tank detection metering device | |
| CN203666500U (en) | Rear turn signal lamp system and automobile | |
| CN110658232A (en) | Method and device for detecting cooling liquid, liquid level sensor and vehicle | |
| US2735909A (en) | Warning signal for hydraulic brake systems | |
| CN216742228U (en) | Steering oil tank assembly and vehicle with same | |
| CN104535137A (en) | Anti-interference fuel oil instrument with alarm function | |
| CN210036881U (en) | Liquid level detection sensor, equipment and car | |
| CN201016783Y (en) | Liquid level alarm control device | |
| CN112066069B (en) | Intelligent blowdown system of air cylinder and control method thereof | |
| CN205260092U (en) | Machine oil liquid level early warning device | |
| CN202071641U (en) | Charging pressure control device of tyre |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180521 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Applicant after: Beijing treasure Car Co., Ltd. Address before: 102206, Beijing, Shahe Town, Changping District Road, sand Yang Applicant before: Beiqi Futian Automobile Co., Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150819 |