CN208579810U - Liquid level monitoring circuit and vehicle - Google Patents
Liquid level monitoring circuit and vehicle Download PDFInfo
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- CN208579810U CN208579810U CN201821040839.8U CN201821040839U CN208579810U CN 208579810 U CN208579810 U CN 208579810U CN 201821040839 U CN201821040839 U CN 201821040839U CN 208579810 U CN208579810 U CN 208579810U
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Abstract
This disclosure relates to a kind of liquid level monitoring circuit and vehicle.The circuit includes: power supply, liquid level sensor, liquid level detection circuit and power sense circuit, liquid level sensor includes the first conducting probe, second conducting probe, first conducting probe and the second conducting probe are arranged in conducting liquid container, the first end of first conducting probe is connected with power supply, the first end of second conducting probe is grounded, liquid level detection circuit detects the first conducting probe and the respective second end of the second conducting probe contacts to form conductive path with conducting liquid, or, it detects at least one of the first conducting probe and the respective second end of the second conducting probe and forms open circuit not in contact with conducting liquid, power sense circuit is arranged between power supply and the first end of the first conducting probe, whether the voltage that detection power supply is provided to the first end of the first conducting probe is normal, therefore, exception can occur to avoid because of power supply or liquid level sensor And the erroneous judgement to conducting liquid level is caused, improve the accuracy to liquid level monitoring.
Description
Technical field
This disclosure relates to technical field of vehicle, and in particular, to a kind of liquid level monitoring circuit and vehicle.
Background technique
Coolant liquid expands the cooling system of vehicle for unfrozen cooling fluid when preventing vehicle from stopping during the cold season；And
Summer then can prevent the coolant liquid in water tank from reaching boiling point, generate a large amount of vapor and bubble.If one in cooling system
Area will make serious depletion around cylinder wall occupied by bubble, so that engine lacks cooling, can make to live
The strength reduction of the components such as plug, piston ring, connecting rod, or even deformation, cannot withstand normal load, while can also destroy each zero
Normal clearance between part makes components not be able to maintain normal oil film, gently then makes engine scuffing, Bearing score, heavy then can also make whole
A engine damage is even scrapped.In addition, coolant liquid also has the function of anticorrosion and scale-deposit-preventing.It can be seen that coolant liquid pair
It is of crucial importance in the normal work of vehicle.
However, different vehicles, the design scheme of cooling system is also different, and the volume of the coolant liquid needed is also different.
If the volume of coolant liquid is unsatisfactory for volume required for vehicle, it will influence the heat dissipation of each components in vehicle, reduce
The service life of vehicle.In order to guarantee the cooling effect in vehicle operation, need to the coolant liquid liquid level in vehicle into
Row detection can be accurate therefore, it is necessary to be provided with one kind in vehicle to guarantee to have enough coolant liquids to radiate vehicle
Detect coolant liquid whether Chong Zu detection circuit.
Utility model content
Purpose of this disclosure is to provide a kind of liquid level monitoring circuit and vehicles, to overcome the problems, such as present in the relevant technologies.
To achieve the goals above, according to the first aspect of the embodiments of the present disclosure, a kind of liquid level monitoring circuit is provided, is wrapped
It includes: power supply, liquid level sensor, liquid level detection circuit and power sense circuit；
The liquid level sensor includes the first conducting probe, the second conducting probe, first conducting probe and described the
Two conducting probes are separately positioned in the container of conducting liquid；
The power supply is connected with the first end of first conducting probe；
The first end of second conducting probe is grounded；
The liquid level detection circuit detects first conducting probe and the respective the second end of the second conducting probe
It is contacted with the conducting liquid and forms conductive path, or, detecting first conducting probe and second conducting probe
At least one of respective the second end forms open circuit not in contact with the conducting liquid；
The power sense circuit is arranged between the power supply and the first end of first conducting probe, detection
Whether the voltage that the power supply is provided to the first end of first conducting probe is normal.
It optionally, should at least one conducting probe in first conducting probe and second conducting probe
The first end that the oriented conducting probe is applied on the second end of conducting probe extends the resistance agent of preset length, to lead described
The variable resistance that resistance value changes with the liquid level of the conducting liquid and changed is formed in electric pathway；
The liquid level detection circuit detects the electricity for changing on the conductive path with the liquid level of the conducting liquid and changing
Parameter value.
Optionally, the liquid level monitoring circuit further include:
First signal processor is connected with the liquid level detection circuit, is determining that the liquid level detection circuit detects institute
When stating conductive path, output characterizes the signal of the conducting liquid abundance, and, determining that the liquid level detection circuit detects
When the open circuit, output characterizes the insufficient signal of conducting liquid.
Optionally, the liquid level monitoring circuit further include:
Second signal processor is connected with the liquid level detection circuit, the electricity detected according to the liquid level detection circuit
Parameter value, output characterize the signal of the liquid level of the conducting liquid.
Optionally, the liquid level monitoring circuit further include:
Filter circuit is arranged between the power supply and the first end of first conducting probe, for the electricity
Source is filtered to the voltage that the first end of first conducting probe provides, and to the of first conducting probe
One end provides filtered voltage.
Optionally, the filter circuit includes: first resistor and first capacitor, one end of the first resistor and the electricity
Power sense circuit is connected, and the other end is connected with one end of the first capacitor, and the first capacitor other end is respectively with described the
The first end of one conducting probe and the liquid level detection circuit are connected.
Optionally, the liquid level detection circuit includes: second resistance, the second capacitor and detecting element,
One end of the second resistance is connected with the first end of first conducting probe, the second resistance it is another
End is connected with the detecting element；
One end of second capacitor is connected with the other end of the second resistance, another termination of second capacitor
Ground；
The detecting element, for detecting the conductive path or the open circuit.
According to the second aspect of an embodiment of the present disclosure, a kind of vehicle is provided, comprising: described in embodiment of the present disclosure first aspect
Liquid level monitoring circuit.
The liquid level monitoring circuit that the embodiment of the present disclosure provides includes: power supply, liquid level sensor, liquid level detection circuit and electricity
Power sense circuit, wherein liquid level sensor includes the first conducting probe, the second conducting probe, and the first conducting probe and second is led
Electric probe is separately positioned in the container of conducting liquid, and the first end of the first conducting probe is connected with power supply, the second conducting probe
First end ground connection, liquid level detection circuit detect the first conducting probe and the respective the second end of the second conducting probe with
Conducting liquid contacts and forms conductive path, or, in the first conducting probe of detection and the respective the second end of the second conducting probe
At least one forms open circuit not in contact with conducting liquid, and the first end of power supply and the first conducting probe is arranged in power sense circuit
Between portion, whether the voltage that detection power supply is provided to the first end of the first conducting probe is normal, therefore, can be quasi- using the circuit
Whether true detection power supply and liquid level sensor there is exception, and then avoid causing due to exception occur in power supply or liquid level sensor
Erroneous judgement to conducting liquid level, and then improve the accuracy monitored to conducting liquid level.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.
Fig. 2 is a kind of another schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.
Fig. 3 is a kind of another schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.
Fig. 4 is a kind of flow chart for method using liquid level monitoring circuit supervision liquid level that the embodiment of the present disclosure provides.
Description of symbols
1: power supply 2: liquid level sensor
21: the first conducting probe, 22: the second conducting probe
3: liquid level detection circuit 31: second resistance
32: the second capacitors 33: detecting element
4: 5: the first signal processor of power sense circuit
6: second signal processor 7: filter circuit
71: first resistor 72: first capacitor
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
Under normal conditions, people mostly use the height of detection coolant liquid liquid level to reflect whether coolant liquid is sufficient, survey at present
The sensor of amount coolant liquid liquid level mainly has float-type liquid level sensor, floating ball type liquid level sensor, static pressure type liquid level sensor
Etc..Wherein, float-type liquid level sensor bulk is larger, is not easy to be inserted into measurement coolant liquid liquid level, floating ball in cooling liquid pot
Formula liquid level sensor can satisfy the requirement in insertion cooling liquid pot in volume, but its higher cost, static pressure type liquid level pass
The processing circuit of sensor is relative complex, therefore, is considered based on factors above, and it is simple that the embodiment of the present disclosure provides a kind of structure, and
Can quick, accurate level monitoring circuit.
Referring to FIG. 1, Fig. 1 is a kind of schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.As shown in Figure 1,
Liquid level monitoring circuit includes: power supply 1, liquid level sensor 2, liquid level detection circuit 3 and power sense circuit 4.
Liquid level sensor 2 includes the first conducting probe 21, the second conducting probe 22, and the first conducting probe 21 and second is conductive
Probe 22 is separately positioned in the container of conducting liquid, and the first end of the first conducting probe 21 is connected with power supply, the second conductive spy
One end of needle 22 is grounded, and one end of liquid level detection circuit 3 is connected with the first conducting probe 21, other end ground connection, therefore, the liquid level
Detection circuit 3 is in parallel with liquid level sensor 2, for detecting the first conducting probe 21 and the respective second end of the second conducting probe 22
Portion contacts with conducting liquid and forms conductive path, or, the first conducting probe 21 of detection and the second conducting probe 22 are respective
At least one of the second end forms open circuit not in contact with conducting liquid, and the setting of power sense circuit 4 is conductive in power supply and first
Between the first end of probe 21, just whether the voltage that detection power supply 1 is provided to the first end of first conducting probe 21
Often, wherein conducting liquid can be coolant liquid.
Since the first conducting probe 21 and the second conducting probe 22 are separately positioned in the container of conducting liquid, supervised in liquid level
When control circuit powers on, when the first conducting probe 21 and the respective the second end of the second conducting probe 22 are contacted with conducting liquid,
Electric current in circuit is flowed into ground terminal by conducting liquid and the second conducting probe 22 from the first conducting probe 21, therefore,
Branch where liquid level sensor 2 is in the conductive state, that is to say, liquid level sensor 2 and conducting liquid form conductive path,
When at least one of first conducting probe 21 and the respective the second end of the second conducting probe 22 are not contacted with conducting liquid, circuit
In electric current can not be flowed into ground terminal after the first conducting probe 21, therefore, the branch where liquid level sensor 2 is in disconnected
Line state that is to say that liquid level sensor 2 and conducting liquid form open circuit.
When the branch where liquid level sensor 2 is in conductive path or is in off state, with the liquid level sensor 2
The liquid level detection circuit 3 that the branch at place is in parallel can detecte the first conducting probe 21 and in the liquid level sensor 2
Whether the respective the second end of two conducting probe 22 contacts with conducting liquid.
Optionally, which can detecte for characterizing the first conducting probe 21 and the second conducting probe 22
The electrical parameter values whether respective the second end contacts with conducting liquid, wherein electrical parameter values can be voltage value, current value
Or numerical value 1 for characterizing high level and for characterizing low level numerical value 0, etc..
When the first conducting probe 21 and the respective the second end of the second conducting probe 22 are contacted with conducting liquid, liquid level
Branch where sensor 2 is in the conductive state, in the first conducting probe 21 and the respective the second end of the second conducting probe 22
At least one of when not contacted with conducting liquid, the branch where liquid level sensor 2 is in an off state, thus, led first
When electric probe 21 and the respective the second end of the second conducting probe 22 are contacted with conducting liquid and at least one not with conduction
When liquid contacts, the impedance in liquid level monitoring circuit can be impacted, and then influence the electrical parameter that liquid level detection circuit 3 detects
Therefore value can characterize first conducting probe 21 and the second conductive spy according to the electrical parameter values that liquid level detection circuit 3 detects
Whether the respective the second end of needle 22 contacts with conducting liquid.
It is therefore mentioned in power supply as it was noted above, liquid level sensor 2 and detection circuit 3 need power supply to provide electric energy when working
When the voltage difference of confession, electrical parameter values detected by detection circuit 3 are also different, may be to the first conducting probe 21 and second
Whether the respective the second end of conducting probe 22, which contacts with conducting liquid, is caused to judge by accident, and then influences the accurate of liquid level monitoring
Degree.Therefore, in the embodiments of the present disclosure, which further includes power sense circuit 4, for detecting power supply 1 and liquid
Whether level sensor 2 there is exception, and then avoids causing due to exception occur in power supply 1 or liquid level sensor 2 to conduction liquid body fluid
The erroneous judgement of position, and then improve the accuracy monitored to conducting liquid level.In addition, the electrical parameter detected by detection circuit 3
When value occurs abnormal, it can also further determine that out that the exception is as caused by power supply 1 or liquid level sensor 2.
Optionally, referring to FIG. 2, Fig. 2 is a kind of another schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.
As shown in Fig. 2, liquid level monitoring circuit further include: the first of power supply 1 and first conducting probe 21 is arranged in filter circuit 7
Between end, for being filtered to power supply 1 to the voltage that the first end of the first conducting probe 21 provides, and to first
The first end of conducting probe 21 provides filtered voltage.Wherein, the input voltage of the liquid level monitoring circuit is pulse voltage.
Filter circuit 7 can be existing filter in existing market, or what capacitor, capacitor or inductance formed
Filter circuit.In order to reduce the cost of liquid level monitoring circuit as far as possible and simplify circuit structure, in the embodiments of the present disclosure,
Filter circuit 7 includes: first resistor 71 and first capacitor 72, and one end of first resistor 71 is connected with power sense circuit 4, another
End is connected with one end of first capacitor 72,72 other end of the first capacitor first end and liquid with the first conducting probe 21 respectively
Position detection circuit 3 is connected.
As shown in Fig. 2, in the first conducting probe 21 and the respective the second end of the second conducting probe 22 of liquid level sensor 2
When contacting with conducting liquid, the branch where the liquid level sensor 2 is in the conductive state, and liquid level detection circuit 3 and liquid level pass
Branch where sensor 2 is in parallel connection, then connects again with first resistor 71 and first capacitor 72, the liquid level monitoring circuit
Impedance reduce, when 1 input voltage of power supply is identical, the electric current of the liquid level monitoring circuit increases, thus first resistor 71 and first
The voltage at 72 both ends of capacitor increases, and the voltage detected in liquid level detection circuit 3 is caused to reduce；In the first conducting probe 21 and
When at least one of respective the second end of two conducting probe 22 is not in contact with conducting liquid is arrived, where the liquid level sensor 2
Branch is in an off state.At this point, liquid level detection circuit 3 is directly connected in series with first resistor 71 and first capacitor 72, the liquid level
The impedance for monitoring circuit increases, and when input voltage is identical, the electric current of the liquid level monitoring circuit reduces, thus first resistor 71 and the
The voltage at one capacitor, 72 both ends reduces, and the voltage detected in liquid level detection circuit 3 is caused to increase.Therefore, it is passed using the liquid level
When branch where sensor 2 is in different conditions, the influence to the electrical parameter values in liquid level detection circuit 3, to monitor the conduction
The height of liquid level of liquid.
Optionally, as shown in Fig. 2, liquid level detection circuit 3 includes: second resistance 31, the second capacitor 32 and detecting element
33, wherein one end of second resistance 31 is connected with the first end of the first conducting probe 21, the other end of second resistance 31 and inspection
Element 33 to be surveyed to be connected, one end of the second capacitor 32 is connected with the other end of second resistance 31, the other end ground connection of the second capacitor 32,
Detecting element 33 is for detecting conductive path or open circuit.
In the embodiments of the present disclosure, it is contemplated that the first conducting probe 21 of liquid level sensor 2 and the second conducting probe 22 are each
From the second end contacted with conducting liquid, cause the impedance in liquid level monitoring circuit to reduce, in the electricity of liquid level monitoring circuit
Periodically, the electric current in liquid level monitoring circuit increases 1 input voltage value of source one, so that the voltage value that detecting element 33 measures
Reduce, alternatively, the current value that detecting element 33 measures increases；First conducting probe 21 and second of liquid level sensor 2 is conductive
At least one of respective the second end of probe 22 is not contacted with conducting liquid, and the impedance in liquid level monitoring circuit is caused to increase,
Electric current in 1 input voltage value of power supply, one timing of liquid level monitoring circuit, liquid level monitoring circuit reduces, so that detection member
The voltage value that part 33 measures increases, alternatively, the current value that detecting element 33 measures reduces, therefore, can pass through detecting element
The sizes of 33 electrical parameter values detected determines that probe is contacted with conducting liquid.
Illustratively, by taking electrical parameter values are voltage value as an example, it is assumed that 1 input voltage of power supply of liquid level monitoring circuit is 5V,
When the first conducting probe 21 and the respective the second end of the second conducting probe 22 of liquid level sensor 2 are contacted with conducting liquid,
Voltage detected by detecting element 33 is 1V；It is each in the first conducting probe 21 of liquid level sensor 2 and the second conducting probe 22
From at least one of the second end do not contacted with conducting liquid when, voltage detected by detecting element 33 is 1.5V.
Optionally, as shown in Fig. 2, liquid level monitoring circuit further include: the first signal processor 5, with 3 phase of liquid level detection circuit
Even, when determining that liquid level detection circuit 3 detects conductive path, the signal of output characterization conducting liquid abundance, and, true
When determining liquid level detection circuit 3 and detecting open circuit, the output characterization insufficient signal of conducting liquid.
As it was noted above, it is respectively the first conducting probe 21 and the second conducting probe that liquid level sensor 2, which includes two probes,
22, wherein the length of two probes can be the same or different, but in order to monitor the level condition of conducting liquid, keep away
The liquid level for exempting from the conducting liquid influences normal use lower than minimum liquid level, in the embodiments of the present disclosure, the first conducting probe 21
It is equal with the minimum liquid level scale of conducting liquid with the second end of probe most short in the second conducting probe 22, in the most short probe
The second end and conducting liquid when contacting, then another probe will also be contacted with conducting liquid, at this point, 2 institute of liquid level sensor
Branch it is in the conductive state, when the second end of the most short probe is not contacted with conducting liquid, at this time no matter another spy
Whether needle contacts with conducting liquid, and the branch where liquid level sensor 2 is in off state, therefore, can be according to liquid level sensor 2
Whether the branch at place is connected to detect whether the liquid level of the conducting liquid is lower than minimum liquid level scale.Wherein, minimum liquid level is carved
Spend the liquid level corresponding in container of the minimum volume for characterizing required conducting liquid.
Illustratively, by taking conducting liquid is coolant liquid as an example, it is generally the case that vehicle is different, the body of required coolant liquid
Product is also different, even if the volume for being needed coolant liquid is identical, if the shape of container is different, required coolant liquid
Liquid level is also different, and therefore, for different vehicles and container of different shapes, needs the spy of liquid level sensor 2
Needle length is also different.
In the embodiments of the present disclosure, it is known that the shape of container and to meet required minimum when the normal vehicle operation cold
But after the volume of liquid, it may be determined that go out liquid level of the coolant liquid of the minimum volume in the container, be denoted as minimum liquid level quarter
Degree, and then 2 middle probe minimum length of liquid level sensor can be determined according to the vessel port to the distance of the minimum liquid level scale.
Illustratively, it is assumed that the volume for meeting required minimum coolant liquid when normal vehicle operation, corresponding to the liquid level in container
For 25cm, wherein the height at vessel port is 0cm, in order to avoid damaging caused by vehicle because of coolant liquid deficiency, is then used for
The length of the most short probe in the liquid level sensor 2 of the detection liquid level in the container is detected no more than 25cm, optimally, is somebody's turn to do
Most short probe length is 25cm.
In conclusion being connect with conductive liquid level in the first conducting probe 21 and the respective the second end of the second conducting probe 22
It when touching, that is to say, when liquid level sensor 2 and conducting liquid form conductive path, show that the liquid level of the conducting liquid is greater than or waits
In minimum liquid level graduation mark, conducting liquid abundance that is to say；It is respective in the first conducting probe 21 and the second conducting probe 22
When at least one of second end is not contacted with conductive liquid level (for example, in above-mentioned two probes a shortest probe not with conduction
Do not contacted with conducting liquid in liquid contact or above-mentioned two probes), show that the liquid level of the conducting liquid is less than minimum liquid
Position graduation mark that is to say conducting liquid deficiency.
First signal processor 5 is connected with detecting element 33, and above-mentioned turning circuit or open circuit can be detected in detecting element 33,
Specifically, turning circuit or the corresponding electrical parameter values of open circuit can be detected in detecting element 33, that is to say characterization conducting liquid level
Electrical parameter values, the first signal processor 5 will test electrical parameter values that element 33 detects compared with preset threshold, joins in electricity
When numerical value is greater than preset threshold, show the first conducting probe 21 and the second conducting probe 22 respective second of liquid level sensor 2
At least one of end is not contacted with conducting liquid, and liquid level sensor 2 and conducting liquid form open circuit, that is to say, conducting liquid
Liquid level be lower than maximum level graduation mark, at this time output characterization the insufficient signal of conducting liquid, and, be not more than in electrical parameter values
When preset threshold, show liquid level sensor 2 the first conducting probe 21 and the respective the second end of the second conducting probe 22 with
Conducting liquid contact, liquid level sensor 2 and conducting liquid form conductive path, that is to say, the liquid level of conducting liquid is not less than most
Big fluid level scale line, output characterizes the signal of conducting liquid abundance at this time.
In the embodiments of the present disclosure, preset threshold be according to the conducting liquid of required minimum volume, and equipped with should
The shape of the container of conducting liquid is come what is determined, and in liquid level monitoring circuit shown in Fig. 2, which supervised in the liquid level
Control circuit impedance and the liquid level monitoring circuit power supply 1 input default input voltage (or liquid level sensor 2 input electricity
Pressure value) centainly, and when minimal volumes needed for conducting liquid volume satisfaction, numerical value detected by detecting element.Illustratively, in electricity
When parameter value is voltage value, preset threshold is voltage value, and when electrical parameter values are current value, preset threshold is current value.
As it was noted above, the second end in order to guarantee most short probe in the first conducting probe 21 and the second conducting probe 22
The minimum liquid level scale that longest can extend into container goes out, and liquid level sensor 2 need to be fixedly mounted on the container equipped with conducting liquid
It is interior, so that the first conducting probe 21 and the second conducting probe 22 of the liquid level sensor 2 extend into the fixed position in container,
Wherein, which is set to the corresponding minimum liquid level scale of conducting liquid minimum volume.Optionally, which can be with
It include: seal receptacle, Plug Division, the seal receptacle is for probe to be fixed in the container of conducting liquid, and to the container
It is sealed, Plug Division is for the first conducting probe and the second conducting probe to be linked into circuit.
Specifically, respective in the first conducting probe 21 and the second conducting probe 22 by taking electrical parameter values are voltage value as an example
When the second end is contacted with conducting liquid, the impedance in liquid level monitoring circuit is smaller, 1 input voltage of power supply, one timing, the liquid
Electric current is larger in position monitoring circuit, and the voltage of first resistor 71 and first capacitor 72 is larger, then detects in liquid level detection circuit 3
Voltage value (detecting element 33 detect voltage value) be less than preset threshold, therefore, in the embodiments of the present disclosure, at the first signal
Reason device 5 will test the electrical parameter values of the detection of element 33 compared with preset threshold, small in the electrical parameter values that detecting element 33 detects
When preset threshold, show that the first conducting probe 21 of liquid level sensor 2 and the respective the second end of the second conducting probe 22 are equal
Conducting liquid is touched, to can determine that the liquid level of conducting liquid is greater than or equal to minimum liquid level scale, the volume of conducting liquid
It more than or equal to the minimum volume of required conducting liquid, that is to say, the conducting liquid is sufficient.
At least one of the first conducting probe 21 and the respective the second end of the second conducting probe 22 not with conducting liquid
When contact, the impedance in liquid level monitoring circuit is larger, 1 input voltage of power supply, one timing, and electric current is smaller in the liquid level monitoring circuit,
The voltage of first resistor 71 and first capacitor 72 is smaller, then the voltage value detected in liquid level detection circuit 3 (examine by detecting element 33
The voltage value of survey) it is greater than preset threshold, therefore, in the embodiments of the present disclosure, the first signal processor 5 will test the detection of element 33
Electrical parameter values compared with preset threshold, detecting element 33 detect electrical parameter values be greater than preset threshold when, show liquid level
At least one of first conducting probe 21 and the respective the second end of the second conducting probe 22 of sensor 2 not in contact with arrive conduction liquid
Body, to can determine that the liquid level of conducting liquid is lower than minimum liquid level scale, the volume of conducting liquid is less than required conduction liquid
Body minimum volume, that is to say, the conducting liquid is insufficient.
Illustratively, it is assumed that 1 input voltage of power supply is 5V, and preset threshold can be 1V, in the electricity that detecting element 33 detects
When pressure is less than or equal to 1V, determine the first conducting probe 21 and the respective the second end of the second conducting probe 22 and conduction liquid
Body is in contact, and that is to say, the conducting liquid is sufficient；When the voltage that detecting element 33 detects is greater than 1V, the first conduction is determined
At least one of probe 21 and the respective the second end of the second conducting probe 22 are not in contact with conducting liquid, that is to say, this is led
Electric fluid low.
Optionally, the liquid level monitoring circuit can also in vehicle instrument board or alarm be connected, determining to lead
After electric fluid low, the indicator light on the instrument board of the liquid level monitoring circuit control vehicle is lighted, or issues alarm signal,
To prompt driver's conducting liquid deficiency of vehicle that need to be replenished in time.It should be noted that in the embodiments of the present disclosure, in determination
After conducting liquid is insufficient out, if issue prompt information and with no restriction.
As it was noted above, the preset threshold is the resistance in the liquid level monitoring circuit in liquid level monitoring circuit shown in Fig. 2
Resist the voltage (or input voltage value of liquid level sensor 2) inputted with power supply 1 centainly, and the first of liquid level sensor 2 is conductive
When probe 21 and the respective the second end of the second conducting probe 22 are contacted with conducting liquid, number that detecting element 33 detects
Value.Correspondingly, electrical parameter values are also based under identical liquid level monitoring circuit, the numerical value that detecting element 33 detects.
When changing in view of the input voltage value of the voltage value or liquid level sensor 2 that input in power supply 1, it to be used for table
The electrical parameter values for levying the liquid level of conducting liquid can also change, meanwhile, for characterizing the first conducting probe of liquid level sensor 2
21 and preset threshold of the respective the second end of the second conducting probe 22 when being contacted with conducting liquid can also occur, in this situation
Under, the size relation of electrical parameter values and preset threshold will be unable to the level condition of reflection conducting liquid.
In order to avoid the input voltage value of voltage value or liquid level sensor 2 inputted by power supply 1 it is abnormal due to conduction liquid
The liquid level of body causes to judge by accident, and the power sense circuit 4 for the liquid level monitoring circuit that the embodiment of the present disclosure provides is arranged in 1 He of power supply
Between filter circuit 6, whether the voltage value for detecting the input of power supply 1 is consistent with default input voltage value.
When the voltage value that power supply 1 inputs is consistent with default input voltage value, show the electricity ginseng that detecting element 33 detects
Numerical value and the comparison result of above-mentioned preset threshold can accurately reflect the level condition of conducting liquid, at this point, determining that power supply 1 inputs
Voltage it is normal.
When the voltage value and default input voltage value that power supply 1 inputs are inconsistent, showing the electrical parameter values not is in power supply 1
The voltage value of input or the input voltage value of liquid level sensor 2 are measured in the case where presetting input voltage value, thus
According to the comparison result of the electrical parameter values and above-mentioned preset threshold, come determine the level condition of conducting liquid be it is inaccurate, because
This, in the embodiments of the present disclosure, in order to avoid the erroneous judgement of the liquid level to conducting liquid, in the voltage value and the default input
When voltage value is inconsistent, the electric voltage exception that the power supply 1 inputs is determined.
Optionally, after the electric voltage exception for determining the input of power supply 1, which can also export to user
Prompt information, which is the prompt information for the voltage value exception that power supply 1 inputs, in order to which user knows the electrical parameter values
It is to be acquired in the case where the electric voltage exception that power supply 1 inputs, and then the electric voltage exception due to the input of power supply 1 can be reduced and caused
Liquid level erroneous judgement to conducting liquid, in addition, user after receiving the prompt information, can also adjust the input of power supply 1 in time
Voltage, with guarantee power supply 1 input voltage value it is consistent with default input voltage value.It should be noted that implementing in the disclosure
In example, after determining electric voltage exception that power supply 1 inputs, if issue prompt information and with no restriction.
It should be noted that power sense circuit 4 can also be arranged in the filter circuit 7 and the first conducting probe 21 it
Between, for measuring the input voltage value of liquid level sensor 2, determine the liquid level sensor 2 input voltage value whether with it is preset
Liquid level sensor input voltage value is consistent, and then determines whether the input voltage value of the liquid level sensor 2 is abnormal.
It therefore, can be different to avoid the input voltage because of power supply 1 or liquid level sensor 2 using above-mentioned liquid level monitoring circuit
The erroneous judgement to conducting liquid level often is caused, further increases the accuracy to conducting liquid level monitoring.
Optionally, referring to FIG. 3, Fig. 3 is a kind of another schematic diagram for liquid level monitoring circuit that the embodiment of the present disclosure provides.
For at least one conducting probe in the first conducting probe 21 and the second conducting probe 22 of the liquid level sensor 2 in Fig. 2,
It is coated with resistance agent on the surface of the conducting probe, is become with forming resistance value in conductive path with the liquid level variation of conducting liquid
The variable resistance of change, as black portions are the resistance agent of the detecting probe surface coating of liquid level sensor 2 in Fig. 3.Wherein, it is coated with electricity
The region of resist is the region of the first end extension preset length from the second end of conducting probe to the conducting probe, this is led
The lower edge of electrical resistivity survey wire surface coating resistance agent is flushed with the minimum liquid level graduation mark in conducting liquid container.
It should be noted that can be on the first conducting probe 21 and the second conducting probe 22 in region as described above
Coated with resistance agent (as shown in Figure 3), alternatively, being coated in one of them region as described above in two conducting probes
Resistance agent is not particularly limited in the embodiments of the present disclosure.
Correspondingly, liquid level detection circuit 3 is used to detect the electricity for changing on conductive path with the liquid level of conducting liquid and changing
Parameter value.
Specifically, the resistance agent contacted on conducting probe with conducting liquid that is to say and extend into the intracorporal resistance of conduction liquid
Agent, it will by the conducting medium short circuit in conducting liquid, the resistance agent not contacted with conducting liquid that is to say and be retained in conduction liquid
External resistance agent forms resistance in liquid level monitoring circuit, and therefore, liquid level detection circuit 3 can be according to above-mentioned conducting probe in liquid
Resistance value size in position monitoring circuit, to detect the situation of change of conducting liquid level.
As shown in figure 3, liquid level monitoring circuit further include: second signal processor 6 is connected, specifically with liquid level detection circuit 3
Ground, the second signal processor 6 are connected with detecting element 33, for the electrical parameter values according to detected by detecting element 33, into
One step determines the liquid level of conducting liquid corresponding to the electrical parameter values, and then exports the signal for characterizing the conducting liquid level.
Due to can uniformly be coated with resistance agent on conducting probe surface, so that the resistance value one in the unit length of conducting probe
It is fixed, one timing of length in resistance agent region is coated in conductive surface, the electrical parameter values that can be detected according to detecting element 33,
Determine the resistance value of the liquid level sensor 2 in liquid level monitoring circuit, wherein the resistance value of the liquid level sensor 2 that is to say
The resistance value coated with resistance agent region part in conducting liquid is not extended into, and then according to the length for being coated with resistance agent region
The part coated with resistance agent region in conducting liquid is spent and do not extended into, determines to extend into conducting liquid and is coated with
The part in resistance agent region, so that it is determined that the liquid level of conducting liquid out.
Illustratively, it is assumed that the length that one of conducting probe surface is coated with resistance agent region is 23cm, unit length
Interior resistance value is 0.5 Ω/cm, and minimum liquid level graduation mark is that 5cm is determined according to the electrical parameter values that detecting element 33 detects
The resistance value of liquid level sensor 2 is 5 Ω, and then can calculate and not extend into the portion coated with resistance agent region in conducting liquid
It is divided into 10cm (5 Ω/(0.5 Ω/cm)=10cm), lower edge and minimum liquid level graduation mark due to conducting probe coating resistance agent
It flushes, is 13cm (23cm-10cm=determining to extend into the part coated with resistance agent region in conducting liquid therefore
When 13cm), that is, it can determine that the liquid level of the conducting liquid is 18cm (5cm+13cm=18cm).
In the embodiments of the present disclosure, when forming conductive path using liquid level sensor 2 and conducting liquid, liquid level sensor 2
Resistance value change with the variation of conducting liquid level so that the electrical parameter values that liquid level detection circuit 3 detects are with liquid level
Variation and the feature that changes, the variations of the electrical parameter values that second signal processor 6 is detected according to liquid level detection circuit 3 determine
The variation of the conducting liquid level therefore, can also be into when determining conducting liquid abundance using above-mentioned liquid level monitoring circuit
One step determines the situation of change of the conducting liquid level.
Referring to FIG. 4, Fig. 4 is a kind of method using liquid level monitoring circuit supervision liquid level that the embodiment of the present disclosure provides
Flow chart.As shown in figure 4, the method for the level monitoring includes the following steps.
In step S31, the voltage value of power input in liquid level monitoring circuit is measured；
In step s 32, judge whether the voltage value is consistent with default input voltage value.In voltage value and default input
When voltage value is consistent, step S34 is executed, it is no to then follow the steps S33.
In step S33, the electric voltage exception of power input is determined.
In step S34, determine that the voltage of power input is normal.
In step s 35, judge whether the electrical parameter values of liquid level detection circuit detection are greater than preset threshold.In the electricity ginseng
When numerical value is greater than preset threshold, step S36 is executed, it is no to then follow the steps S37.
In step S36, conducting liquid deficiency is determined.
In step S37, conducting liquid abundance is determined.
In the manner described above, measure liquid level monitoring circuit in power input voltage value, and by the voltage value with preset it is defeated
Enter voltage value to compare, judge whether the input voltage value is consistent with default input voltage value, in the input voltage value and presets
When input voltage value is inconsistent, the comparison result of the electrical parameter values and preset threshold that show liquid level detection circuit detection cannot be accurate
The level condition for reflecting conducting liquid, may cause to judge by accident, accordingly, it is determined that the voltage of power input to the liquid level of conducting liquid
It is abnormal.
When the voltage value of power input is consistent with default input voltage value, show the electricity of liquid level detection circuit detection
Parameter value and the comparison result of preset threshold can accurately reflect the level condition of conducting liquid, at this point, determining the power input
Voltage it is normal, next, it is determined that liquid level detection circuit detection electrical parameter values whether be greater than preset threshold, it is big in the electrical parameter values
When preset threshold, show in the first conducting probe and the respective the second end of the second conducting probe of liquid level sensor at least
One is not contacted with conducting liquid, and the liquid level of the conducting liquid is lower than the minimum liquid level scale in container, that is, the conducting liquid is not
Foot shows that the first conducting probe of liquid level sensor and the second conducting probe are each when the electrical parameter values are not more than preset threshold
From the second end contacted with conducting liquid, the liquid level of the conducting liquid is higher than the minimum liquid level scale in container, that is, this is led
Electro-hydraulic body is sufficient.
By adopting the above technical scheme, when the input voltage value of power supply is normal in ensuring liquid level monitoring circuit, judge liquid level
Whether the electrical parameter values of detection circuit detection are greater than preset threshold, the level condition of Lai Fanying conducting liquid, therefore, in guarantee pair
Under the premise of the liquid level monitoring of conducting liquid is accurate, the workload of DATA REASONING and processing can be reduced, in addition, the program is to pass through
Whether the probe for the liquid level sensor being arranged in container contacts with the conducting liquid in the container, to influence liquid level detection circuit
The electrical parameter values of detection, therefore, it can accurately and rapidly reflect the container using the electrical parameter values that liquid level detection circuit detects
The level condition of interior conducting liquid.
Based on the same inventive concept, the embodiment of the present disclosure also provides a kind of vehicle, comprising: the liquid that the embodiment of the present disclosure provides
Position monitoring circuit.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (8)
1. a kind of liquid level monitoring circuit characterized by comprising power supply (1), liquid level sensor (2), liquid level detection circuit (3)
And power sense circuit (4)；
The liquid level sensor (2) includes the first conducting probe (21), the second conducting probe (22), first conducting probe
(21) it is separately positioned in the container of conducting liquid with second conducting probe (22)；
The power supply (1) is connected with the first end of first conducting probe (21)；
The first end of second conducting probe (22) is grounded；
The liquid level detection circuit (3) detects first conducting probe (21) and second conducting probe (22) respective the
Two ends contact with the conducting liquid and form conductive path, or, detection first conducting probe (21) and described the
At least one of two conducting probes (22) respective the second end forms open circuit not in contact with the conducting liquid；
The power sense circuit (4), be arranged the power supply (1) and first conducting probe (21) first end it
Between, whether the voltage for detecting the first end offer of the power supply (1) the first conducting probe of Xiang Suoshu (21) is normal.
2. liquid level monitoring circuit according to claim 1, which is characterized in that be directed to first conducting probe (21) and institute
At least one conducting probe in the second conducting probe (22) is stated, the oriented conducting probe is applied on the second end of the conducting probe
First end extend preset length resistance agent, in the conductive path formed resistance value with the conducting liquid liquid level
The variable resistance of variation and variation；
The liquid level detection circuit (3) is detected the electricity for changing on the conductive path with the liquid level of the conducting liquid and changing and is joined
Numerical value.
3. liquid level monitoring circuit according to claim 1, which is characterized in that further include:
First signal processor (5) is connected with the liquid level detection circuit (3), is determining the liquid level detection circuit (3) detection
When to the conductive path, output characterizes the signal of the conducting liquid abundance, and, determining the liquid level detection circuit
(3) when detecting the open circuit, output characterizes the insufficient signal of conducting liquid.
4. liquid level monitoring circuit according to claim 2, which is characterized in that further include:
Second signal processor (6) is connected with the liquid level detection circuit (3), is detected according to the liquid level detection circuit (3)
Electrical parameter values, output characterizes the signal of the liquid level of the conducting liquid.
5. liquid level monitoring circuit according to claim 1, which is characterized in that further include: filter circuit (7) is arranged in institute
It states between power supply (1) and the first end of first conducting probe (21), for conductive to the power supply (1) Xiang Suoshu first
The voltage that the first end of probe (21) provides is filtered, and is mentioned to the first end of first conducting probe (21)
For filtered voltage.
6. liquid level monitoring circuit according to claim 5, which is characterized in that the filter circuit (7) includes: first resistor
(71) it is connected with first capacitor (72), one end of the first resistor (71) with the power sense circuit (4), the other end and institute
The one end for stating first capacitor (72) is connected, first capacitor (72) other end respectively with first conducting probe (21) the
One end and the liquid level detection circuit (3) are connected.
7. liquid level monitoring circuit according to claim 1, which is characterized in that the liquid level detection circuit (3) includes: second
Resistance (31), the second capacitor (32) and detecting element (33),
One end of the second resistance (31) is connected with the first end of first conducting probe (21), the second resistance
(31) the other end is connected with the detecting element (33)；
One end of second capacitor (32) is connected with the other end of the second resistance (31), second capacitor (32) it is another
One end ground connection；
The detecting element (33), for detecting the conductive path or the open circuit.
8. a kind of vehicle characterized by comprising such as the described in any item liquid level monitoring circuits of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821040839.8U CN208579810U (en) | 2018-06-29 | 2018-06-29 | Liquid level monitoring circuit and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821040839.8U CN208579810U (en) | 2018-06-29 | 2018-06-29 | Liquid level monitoring circuit and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110353589A (en) * | 2019-07-15 | 2019-10-22 | 珠海格力电器股份有限公司 | A kind of liquid level detection device, detection method and dish-washing machine |
| WO2023044647A1 (en) * | 2021-09-23 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Battery, electric device, and manufacturing method for battery |
-
2018
- 2018-06-29 CN CN201821040839.8U patent/CN208579810U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110353589A (en) * | 2019-07-15 | 2019-10-22 | 珠海格力电器股份有限公司 | A kind of liquid level detection device, detection method and dish-washing machine |
| WO2023044647A1 (en) * | 2021-09-23 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Battery, electric device, and manufacturing method for battery |
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Effective date of registration: 20191021 Address after: 102206, Beijing, Shahe, Changping District Town, Sha Yang Road, Lao Wan Village North Patentee after: Beiqi Futian Automobile Co., Ltd. Address before: 100102 building, No. 1, 2 Tong Tung Avenue, Chaoyang District, Beijing Patentee before: Baowa Automobile (China) Co., Ltd. |