Fuel level meter

FIELD: measuring technique.

SUBSTANCE: fuel level meter comprises elongated capacitive sensor connected in the frequency-generating circuits of functional and base self excited oscillators. The main and additional counters generate the position code of the fuel level from the output frequencies of the self-excited oscillators. The level is indicated by the linear or pointer indicator provided with a converter of position code into the current of supplied to the pointer indicator.

EFFECT: reduced power consumption and enhanced reliability.

2 cl, 2 dwg

 

The invention relates to measuring technique and allows to increase the reliability of the fuel level in the vaults, wells, tanks and fuel tanks of vehicles with an upper limit of the controlled level of from 0.2 to 12.8 meters. Known industrial automotive indicators for fuel level, containing a float sensor with rekorda, the slider of which is connected in series with analog indicator fuel level and connected with the float. Depending on the fuel level changes, the resistance of that part of rekorda, which is included in the serial circuit consisting of frame pointer of the device, battery and Rekord. A significant disadvantage of this analogue in its low reliability, intrinsic safety and precision level measurement. Also known level sensor liquid containing a bridge circuit with extended functional and the compensating resistors of different resistance heated by the current in the bridge circuit [1]. Depending on the liquid level causes the unbalance of the bridge due to the different heat transfer resistance thermometers. This imbalance is enhanced by the amplifier, the output of which is connected to the level indicator. The main disadvantages of analogue [1]:

- high cost and low reliability of an Assembly of two extended resistors of different resistance the population, especially when the fluid level control more than 500 mm;

low long-term and temperature stability of the readings due to sedimentation of the impurities on the surface of extended thermistors and when working in a wide temperature range.

Closest to the proposed known technical solution is a digital meter liquid parameters [2]. The prototype contains extensive sensitive element in the form of linearly extended functional thermistors with indirect heating, placed on a common basis with compensation thermistor and current source heating, functional and the reference oscillator, the primary and secondary counters, digital indicators, temperature and level and control scheme account. Device [2] provides high reliability and accuracy of digital liquid level measurement up to 500 mm, but a significant disadvantage is the significant energy and cost onanoperation thermistors with indirect heating, especially when you have control of the level of more than 500 mm in Addition, when the fuel level is more than 500 mm, the sharply reduced control accuracy and reliability of the device.

The technical result of the invention is to reduce power consumption, increase reliability and simplify device when the control level is Oliva and other liquids in a wide range of temperature and controlled level. To achieve the technical result of the lengthy sensitive capacitive element is made, the primary and secondary counters have decoders positional code, the output function of the oscillator is connected to the counting input of the counter, the output of the reference oscillator is connected to the counting input of the main counter, the control circuit expense includes first and second elements 2I, RS-trigger and element selection of the leading edge, the first outputs of the counter through the RS-flip-flop and the first element 2I IS NOT connected to the input of the account management main counter input reset main counter is connected through the element selection leading edge to output RS-trigger, and the second input of the first element 2I IS NOT connected to the output of the second element 2, the first input of the second element 2 IS NOT connected to the second output of the counter, and the second input of the second element 2 IS NOT connected to the output of the overflow of the main counter, the outputs of the decoder positional code of the primary counter is connected through inverters, isolating diode and limiting resistor to the switches indicator or directly to an led indicator. In addition, the ratio of the reference frequencies f1 and f2 functional oscillator is chosen by the condition: f1=m×n×f2max, where m is the number of periods of the frequency f1 in the range of accounts n is the number of States of the main counter, and the extended capacity of the sensing element is designed to ensure conditions: d/dh=dV/dh, where DM is the current value of the total capacity of castorocauda chain functional oscillator, h is the current value of the controlled fuel level, V - the current value of the controlled volume of fuel.

The structure of the device is shown in figure 1, figure 2 shows the option of including a dial indicator to the outputs of the main counter. The device contains extensive capacitive sensor element 1, function 2, and reference 3 oscillators, basic 4, and 5 additional counters with decoders position code on the output. The structure of the device includes a control circuit 6 and a linear indicator light 7 level. The control circuit 6 contains the first element 2I-8, RS-trigger 9, the second element 2I-10 and item 11 selection of the leading edge. The output of the function generator 2 is connected to the counting input of the counter 5, and the output of the reference oscillator 3 is connected to the counting input of the main counter 4. Sign in With account management counter 4 is connected to the first output U control circuit 6, and R is reset main counter 4 to the second output Uo schema account management. The inputs of the control circuit 6 is connected to the first outputs of the de is imator positional code counter 5. Linear led 7 level inputs connected to the outputs of the decoder positional code of the main counter and contains the number of light elements equal to the number of output bits of the positional code of the main counter.

The device can be traced since the installation of the RS-flip-flop 9 in one state leading edge of the signal U1 from the first output of the decoder, the positional code of the counter 5. On the leading edge of the signal U1 signal U goes in one state, the element 11 is formed a short signal Uo - counter 4 is reset. The value of the signal U=1 "permitted account of pulses of the reference frequency f1 in the main counter 4". After the first overflow of the counter 4 is the standard account of pulses of the reference frequency f1 to the end of the interval account. Interval account TSC=2/f2 ends on the leading edge of the signal U on which RS-flip-flop 9 is switched to the zero state, whereby the signal U=0 to complete the formation interval of the account and the standard account of pulses of frequency f1 is recorded in the buffer register counter 4 on the trailing edge of the signal U. The status of the buffer register /figure 1 are not shown/ counter 4 is converted combined with counter decoder binary code in the position code and the linear light indicator 7. Re-formation interval account TSC will happen on cerenomy the leading edge of the signal U1. The interval value TSC is inversely proportional to the capacity of the SD between pins 12 and 13 extended sensing element 1. If the minimum value of the controlled fuel capacity SD minimal, functional frequency f2 maximum, interval TSC minimum and Vice versa. This provides a direct correlation between the number of regarded by the counter 4 pulses of frequency f1 by the end of the next interval account TSC from the value of the controlled fuel level. Figure 1 shows the connectivity option scheme 6 conclusions the counter 5, which provides TSC=2/f2. With this choice of sootnosheniya frequencies f1 and f2 is provided by the number of pulses in the interval TSC 8 /at zero fuel level/ 16 /maximum fuel level/what is possible with a twofold change in the total capacitance in castorocauda the functional circuit of the oscillator 2. For oscillator 2 with customizability RC elements well-known relationship: T2=1,4 R (DM+DM), where DM is the capacitance between terminals 12 and 13, depending on the level of the fuel, With constant capacity, R - resistance resistor in castorocauda chain. When the value From=pF need to change the CD in the range from 50 to 190 pF, then DM+With will be within (141...281)pF. Select R=750 ohms and get T2 in the range from 148 to 295 μs or frequency f2 within 6756 to 3390 Hz, respectively. Selecting the frequency f1=54 kHz, obtain the required range is n changes the number of pulses of the account NMCs=(8 - 16). Frequencies f1 and f2 can be selected in the range from tens of Hz to 100 kHz.

Frequency f1=54 kHz is provided when the real value of the compensation capacitance IC=80 pF between pins 13 and 15 of the element 1 and the resistance value RA=165 kω in the reference oscillator 3. The possible range of changes Nc4=(16-24), and the range of change of the total capacity of the SD 1.5 times, it is necessary to provide double the overflow of the counter 4 for interval account. This is achieved by connecting the second input of the control circuit 6 /input RS-flip-flop 9 in the zero state to the signal output U counter 5. The increase in the number of bits of the counter 5 is possible to provide multiple overflow of the main counter 4 for interval account TSC. In any case, the frequency ratio of the reference 3 and 2 functional oscillator device is chosen by the condition: f1=m×n×f2max, where m is the number of periods of the frequency f2 in the interval account, n is the number of States of the main counter 4. Oscillators 2 and 3 can be assembled on the inverters are CMOS-type in a single chip, which will increase the temperature stability of the device. No need for indirect heating of the sensing element 1 along with the use of chip CMOS-type allows to reduce the total current consumption of the device. Mainly consumed by the device current dependence is from the power line length indicator 7. When using LEDs AS as elements 16...23 linear light indicator total current consumed by the device can be set in range (3...10) mA regardless of the number of bits of the counter 4. Extensive capacitive sensor element 1 is much cheaper, more reliable and easier to manufacture due to the lack of Nickel tracks micron width. All the elements of the device except for the longest sensing element 1 and the linear light indicator 7 can be manufactured in the form of a microchip and place together with the element 1, for example. The number of output bits of the main counter 4 is chosen in the range from 4 to 128 and above to ensure the required accuracy of indication of the fuel level. The upper limit of the controlled fuel level may be in the range of 0.2 to 12.8 meters. For control using the proposed unit amount of fuel you need to perform the following relationship: dC/dh=dV/dh, where DM is the current value of the total capacity of castorocauda chain functional oscillator, h is the current value of the controlled fuel level V6 is the current value of the controlled volume of fuel. Indicator 7 in this case should be digitized in units of volume of fuel. All digital elements of the device are implemented on the serial circuits of the CMOS type /series for example 564, C, C etc./.

When dopolneniya Converter Figure 2 positional code to an analog signal can be replaced industrial float automotive fuel level sensor proposed by the transmitter. Instead of the linear light indicator 7 to the outputs of the counter 4 through the inverter 24...31 and barrier diodes 32...38 connected resistors 39...45 through which is fed a supply current at a standard dial indicator 46. When is close to zero controlled fuel level valid signal at the first output of the counter 4 through the inverter 24 and the resistor 47 exposed element 48 zero fuel level. Other values of fuel level indicates a dial indicator 46, the supply current which is set by the values of resistors 39...45. In this embodiment, device elements 4, 24...48 may be placed in place of extended sensing element 1, and the setup dial indicator 46.

SOURCES of INFORMATION

1. The liquid level sensor. Autospid. The USSR №1673857, IB No. 32, 1991

2. Digital meter liquid parameters. Autospid. The USSR №157492, BI No. 26, 1990

1. The level gauge fuel containing functional and the reference oscillator, the length of the sensing element is connected to the oscillator, the primary and secondary counters, schema, account management, level indicator, characterized in that the longest sensitive capacitive element is made, the primary and secondary counters have decoders positional code, the output function of the oscillator is connected to the counting in the ode counter, the output of the reference oscillator is connected to the counting input of the main counter, the control circuit expense includes first and second elements 2I, RS-trigger and element selection of the leading edge, the first outputs of the counter are connected through the RS-flip-flop and the first element 2I-NOT to the entrance of account management main counter input reset main counter is connected through the element selection leading edge to the output of the RS flip-flop and the second input of the first element 2I IS NOT connected to the output of the second element 2, the first input of the second element 2 IS NOT connected to the second the output of the counter, and the second input of the second element 2 IS NOT connected to the output of the overflow of the main counter, in addition, the outputs of the decoder positional code of the primary counter is connected through inverters, isolating diode and limiting resistor to the switches indicator or directly to an led indicator.

2. The fuel level gauge according to claim 1, characterized in that the functional capacity of the extended sensing element is made to ensure conditions dCd/dh=dVb/dh, where Cd- the current value of functional capacity, Vb- the current value of the fuel volume in the tank, h is the current value of the fuel level, and the compensation capacity of extended chuvstvitelnosti concentrated in its lower part.

3. The fuel level gauge according to claim 1, characterized in that the ratio of frequency f1supporting and f2functional oscillator is chosen by the condition f1=m×n×f2max.where m is the number of periods of the frequency f2in the interval account, n is the number of States of the main counter.



 

Same patents:

FIELD: measuring level of melt metals, possibly in systems for controlling manufacturing processes in metallurgical industry, for example in apparatuses for thermal-magnetic reduction of titanium.

SUBSTANCE: device includes exciting windings and metal level pickups in the form of induction turns, computing unit. Said windings and level pickups are placed in pairs around vessel with melt metal. Computing unit is connected with level pickups. It provides possibility for scanning pickups, digitizing voltage values of pickups, approximating pickups readings of designed curve found according to decision of simulation task, calculating derivative of said curve and determining metal level according maximum value of derivative. Excitement windings of device are connected in series and they form electromagnet.

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2 cl, 3 dwg

FIELD: measuring equipment engineering, possible use for measuring level of liquid products, in particular, oil and oil products in railroad cisterns.

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FIELD: electric measurement engineering.

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Water level alarm // 2247334

FIELD: measuring engineering.

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Inductive sensor // 2239792
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FIELD: measurement technology; high-accuracy determination of liquefied gas mass in reservoir irrespective of its phase.

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Water level alarm // 2247334

FIELD: measuring engineering.

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FIELD: measuring equipment engineering.

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6 dwg

FIELD: electric measurement engineering.

SUBSTANCE: method can be used for measurement of electrical parameters of two-terminal networks used as detectors of physical processes (temperature, pressure, level of liquid and loose maters et cetera) at industrial installations, transportation vehicles and in systems for measuring level of setting-up of rocket-space equipment. Sinusoidal voltage is formed in capacitive level gauge and complex current is measured which passes through dry capacitive level gauge as well as through filled-in capacitive level gauge. Equivalent circuit of capacitive level gauge is specified which circuit consists of electric capacitance and active resistance. Sinusoidal voltage is formed in capacitive detector at two frequencies. After it complex current is measured through dry level detector and through reference detector for any of those frequencies. Results of measurement are registered, electric capacitance of capacitive level gauge is measured and registered and increment in electric capacitance of capacitive level gauge is measured and registered when submerging gauge into dielectric matter completely. Subsequent measurement and registration of complex current is carried out through capacitive level gauge filled with dielectric matter and through reference gauge for any of mentioned frequencies. For any periodical measurement the electric capacitance of capacitive level gauge is measured and registered. Relative filling of capacitive level gauge with dielectric matter is measured as difference of values of electric capacitance of dry capacitive level gauge and electric capacitance of filled-up capacitive level gauge related to increment in electric capacitance of capacitive level gauge submerged into liquid totally.

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2 dwg

FIELD: measuring equipment engineering, possible use for measuring level of liquid products, in particular, oil and oil products in railroad cisterns.

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EFFECT: increased manufacturability, reliability and precision when measuring level of liquid product.

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FIELD: measuring level of melt metals, possibly in systems for controlling manufacturing processes in metallurgical industry, for example in apparatuses for thermal-magnetic reduction of titanium.

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2 cl, 3 dwg

Fuel level meter // 2289105

FIELD: measuring technique.

SUBSTANCE: fuel level meter comprises elongated capacitive sensor connected in the frequency-generating circuits of functional and base self excited oscillators. The main and additional counters generate the position code of the fuel level from the output frequencies of the self-excited oscillators. The level is indicated by the linear or pointer indicator provided with a converter of position code into the current of supplied to the pointer indicator.

EFFECT: reduced power consumption and enhanced reliability.

2 cl, 2 dwg

FIELD: measuring equipment engineering.

SUBSTANCE: holding system for measuring device for controlling and/or determining level of environment in reservoir, containing at least one body (13) and at least one elongated block (1). In accordance to invention, body (13) of device includes at least one incision ring (4), which is cut into external layer of elongated block (1) oriented from end process with possible connection of elongated block (1) to body (13) of device electrically, with resistance to compression and stretching.

EFFECT: creation of holding system, by means of which holding block may be fastened on or in a body of device.

8 cl, 3 dwg

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