Capacitance liquid level meter (variants)

FIELD: the invention refers to the field of instrument making and designed for control of the level of dielectric and current conducting liquids in hydraulic systems (fuel, freezing, accumulative etc) for example the level of oil or cooling agent in transport vehicles.

SUBSTANCE: the liquid level meter has a two-electrode capacitance sensor with an external 10 and interior 11 electrodes electrically connected with an electronic scheme having a stabilized source of power supply, an amplifier, a generator and a trigger. According to the first variant the capacitance sensor is fulfilled in the shape of a coaxial condenser "C". The interior electrode 11 of the sensor is fulfilled tubular and is mounted inside a fluoroplastic probing rod 12. The interior electrode 11 is connected to the input of a phase comparator which is additionally introduced in the scheme and whose output is connected with input of the trigger and the output of the last is provided with a line of delay and has two outputs - direct and inverse connected with a transistor key fulfilled with possibility of fulfillment of an operation "switched on" or "switched off". At that the electronic scheme is fulfilled on a digital integrated microchip. According to the second variant the interior electrode 11 of the coaxial condenser "C" is fulfilled tubular and is additionally provided with a protective shield 22. The shield 22 is fulfilled in the shape of a spiral spring out of bronze and electrically connected with the external electrode - the body 10 of the coaxial condenser "C".

EFFECT: increases sensitiveness and accuracy of measuring of the level of liquid.

6 cl, 4 dwg

 

The invention relates to the field of instrumentation and is designed to control the level of dielectric and conductive liquids in hydraulic systems (fuel, cooling, storage, and others), for example, oil level, fuel or antifreeze in vehicles.

Known capacitive compensation level transmitter for level measurement of liquids (1). The transmitter includes measuring and compensating sensors, alternator, two capacitance-to-voltage, each of which includes an operational amplifier and a capacitor, two schemes subtraction, two zoom control and indicator. A distinctive feature of the scheme of the device is that it introduced two additional voltage divider, two transducer voltage-to-frequency and frequency divider, and the output of the generator through the regulators of scale are connected to first inputs of the subtraction schemes and the inputs of the voltage dividers. The outputs of the voltage dividers is connected to penverne inputs of operational amplifiers converters capacitance into a voltage, and outputs the latter is connected to the second inputs of the subtraction schemes, the conclusions of which, through voltage converters in frequency, are connected to two inputs of the frequency divider, the third output of which is connected to the generator output and the output to the input of the indicators.

Known level sensor, diff is intiraymi reference signal (2). The sensor includes a capacitive probe and provided with a loop open type and a reference voltage generator that generates pulses of a triangular shape, an amplifier and means for supplying line voltage, is directly proportional to the measured level of liquid.

The disadvantages of the known sensors are complex elemental composition and insufficient operational reliability.

A capacitive sensor for level measurement of liquids, such as oil in vehicles (3). The sensor contains an asymmetrical multivibrator, two differentiator, the operational amplifier with the level of negative feedback, not inverting input of which is connected to the first electrode of the capacitive sensor. A distinctive feature of the sensor is that the electronic circuit has introduced an element of bias memory out phase-sensitive rectifier and connected in series stabilized power supply, multivibrator, differentiator and the use of asymmetrical multivibrator as the generator of the reference voltage, which simultaneously sets the necessary duration of the pause between pulses of voltage, providing a flow transients in the power circuit elements by the time the next generation of the probe pulse.

A disadvantage of the known sensor which is not sufficiently high operational reliability, caused by the design of the circuit elements and the capacitive sensor.

Known capacitive sensor, an electronic circuit which is made on the MOS transistor (4). The sensor contains a sensor in the form of first and second electrodes, the generator of rectangular pulses, connected to the first input key, the first input connected to the direct input of amplifier inverse input of which is connected to the connection point of the first and second resistors. The sensor is characterized by the fact that in the scheme entered terminal of a bias voltage, which is connected with the second input key. The key is performed on the MOS transistor, the second input is connected to the second electrode of the sensor. The amplifier is made also on the MOS transistor with the ability to connect it directly via a shielded line alternately to the second electrode of the sensor and the terminal voltage offset.

The disadvantage of this technical solution is the difficulty of creating a microelectronic performance schema tanks, comparable to the capacity of the sensor, which reduces the accuracy of the transmitter and the reliability of his work.

Closest to the proposed invention capacitive level meter to control the level of dielectric fluid (e.g. oil) on a vehicle, which is selected as a prototype (5). The meter contains dohale tredny capacitive sensor, the second external electrode which is connected to the housing. An electronic circuit includes a stabilized power supply, operational amplifier, and the level of negative feedback of the latter is connected with its inverting input and the first internal electrode of the capacitive sensor. Link positive feedback operational amplifier is connected with its reinvestiruet entrance. The scheme introduced additional standby multivibrator and the trigger. The input of the operational amplifier is connected to the input of the standby multivibrator and to the first input of the trigger, and the output of the standby multivibrator is connected to a second input of the trigger. This schematic provides a linear dependence of the frequency of oscillations in the circuit of the operational amplifier from the sensor capacitance, which increases the precision of the measurements. This eliminates the influence of higher harmonics on the overestimation of the errors compared with the actual level of the liquid when the level increases, the higher harmonics and the underestimation compared with the actual level of the liquid when the level of the harmonics.

The disadvantage of the prototype is the lack of operational reliability due to cell performance of the electronic circuit of the meter and its layout design in General.

The aim of the invention is to eliminate this drawback, improving sensitivity and is echnosti measurement of liquid level.

Option 1. This objective is achieved in that the capacitive level meter liquids containing two-electrode capacitive sensor with internal and external electrodes electrically connected with an electronic circuit that includes a stabilized power supply, amplifier, oscillator and trigger according to the invention, the capacitive sensor is made in the form of a coaxial capacitor internal electrode which is made tubular, is mounted within the bore of the probe and is connected to the input of additionally introduced into the circuit of the phase comparator, the output of which is connected to the input of the trigger, and the output of the latter is connected to the input of the trigger with delay line containing two outputs - the direct and inverse, which are connected with transistor key made with the possibility of operation "on" or "off", while the electronic circuit is a digital integrated circuit.

Option 2. This objective is achieved in that the capacitive level meter liquids containing two-electrode capacitive sensor with internal and external electrodes electrically connected with an electronic circuit that includes a stabilized power supply, amplifier, oscillator and trigger according to the invention, the capacitive sensor is made in the form of coaxial to the of tensator, the inner electrode which is made tubular, is mounted within the bore of the probe and provided with a protective screen, while the inner electrode is connected to the input of the phase comparator is additionally introduced into the circuit, the output of the comparator is connected to the input of the trigger, and the output of the latter is connected to the input of a trigger, which is equipped with a delay line and provides two outputs - the direct and inverse, United transistor with a key made with the possibility of operation "on" or "off", while the electronic circuit is a digital integrated circuit.

A generator configured to generate a rectangular pulse.

A comparator configured to convert the magnitude of the slope of the signal from the capacitive sensor in a phase shift which is detected by the trigger.

The outer coaxial electrode of the capacitor made in the form of a cylindrical body in which is hermetically mounted steklotekstolity printed circuit elements of the electronic circuit of the meter.

The protective screen is made in the form of coil springs made of bronze and is electrically connected with the external electrode of the coaxial capacitor, with PTFE probe with the inner tubular electrode coaxial capacitor placed nesimmetrichno inside the coil spring.

The technical result of the invention is to improve the reliability, accuracy and sensitivity of the meter, which is achieved by the execution of an electronic circuit using chip and the introduction into it of the comparator and a second trigger. Such circuitry is devoted to the conversion of a signal from the capacitive sensor, the phase shift, which is registered by the trigger. The performance meter in the first embodiment provides determining the level of dielectric fluid, in particular oil, and measuring the second option due to the presence of the protective screen provides reliable level measurement of conductive liquids such as antifreeze.

The invention is illustrated by drawings (Fig.1-4).

Figure 1 presents the block diagram of the measuring liquid level.

Figure 2 - schematic electrical diagram of the meter.

Figure 3 - General view of the meter without the protective screen.

Figure 4 - meter Assembly with a protective screen.

Capacitive probe according to the 1st variant contains an electronic circuit 7, performed on the integrated circuit 8, and includes a square-wave generator 1, the output of which is electrically connected with the internal electrode 11 of the capacitive sensor 9 and the input of the phase comparator 2; trigger 3, associated with the output comparat the RA 2 and the input of the second trigger 4, which is provided with a delay device 6 and the direct and inverse outputs connected to the transistor 5 key. The sensor 9 is made in the form of a coaxial capacitor "C" and contains an outer cylindrical electrode body 10, the inner tubular electrode 11, which is mounted inside the bore of the probe 12. In the inner cavity 13 of the external electrode body 10 is placed steklotekstolity Board 14 with radioelements Assembly 15 of the electronic circuit 7. The Assembly 15 is hermetically isolated compound 16 from the external environment and is closed by a plug 17 through which displayed the connecting wires 18 with the terminals 19 or connecting connector 20 for connecting the meter to the power source 21 and the indicating device (not shown). The sealing Assembly 15 provides stable operation of the electronic circuit 7 in different operating conditions, regardless of temperature and humidity conditions of the external environment.

According to the 2nd embodiment of the meter of the inner tubular electrode 11 with the probe 12 further comprises a protective shield 22, which is made in the form of coil springs made of bronze. The screen 22 is fixed in the tip seat 23 of the electrode body 10 and electrically connected with him. This placement relative to each other of the inner electrode 11 and the external electrode body 10, in which the screen 22 is a continuation of the case is 10 as an external electrode of the coaxial capacitor "C", provides high sensitivity and efficiency of the sensor 9 for measuring the level of the dielectric fluid. At the same time the spring-loaded screen 22 has a protective function, preventing the probe 12 with the tubular electrode 11 from mechanical damage, which increases the operational reliability of the meter.

The electronic circuit 7 and the Assembly 15 on steklotekstolity Board 14 on the 1st and 2nd production versions of the meter are identical to each other. A feature of the performance of the electronic circuit 7 is the use of integrated circuits 8 type VC1001D collected using a CMOS field-effect transistors the size of 90 nm, which is made of the comparator 2 trigger 3 and 4. In working condition these transistors are in two main States, depending on the attached sign of the voltage at the gate: open, when they conduct electric current, and locked - in this case the electric current is not conducted. Changing the polarity of the gate CMOS transistor, manage the flow of electric current in the trigger 3, 4 under the influence of signals from the capacitive sensor 9. Each of the triggers 3 and 4 has two outputs: main and inverse and each state correspond to certain signals on their outputs, other than its level. On the main output signals are formed of a high level, and in ersem - low levels.

Capacitive level meter fluid works as follows.

To control the level of dielectric fluids (e.g. engine oil engine) use the probe made according to the 1st option, and the level of conductive liquids such as antifreeze in the motor vehicle) control measure performed on the 2nd variant of the present invention. The meter is installed so that the sensing element is an inner tubular electrode 11 was located in the control zone (in the tank for the coolant of the vehicle or the engine crankcase to control the oil level) is not shown, while the outer electrode body 10 is electrically in contact with the engine block is grounded to ground (not shown). The connecting wires 18 with the terminals 19 or plug 20 is connected to the stabilized power source 21 and the indicating device of the electrical system of the vehicle (not shown). When turning on the power source 21 is started, the generator 1 of rectangular pulses which are fed to the sensing element is a capacitive sensor 9 to the inner electrode 11, and then the signals are sent to the phase comparator 2, where there is a continuous comparison of the signals from the sensor 9, and the conversion value of the slope in the phase shift, which which is registered by the trigger 3. With trigger 3 signal corresponds to the second trigger 4 and, if necessary, is fed to the delay line 6. The trigger 4, through direct and inverted outputs, controls the operation of transistor switch 5, ensuring its status is "enabled" to "disabled". The sensor 9 changes its switching state when 50%of immersed area of the probe 12 in a controlled fluid, and indications of the level of the controlled fluid appear on the instrument display panel (not shown).

Technical characteristics of the meter are shown in table 1.

№ p/pNameOptions
1Controlled fluid
- dielectric (maloprodaja)engine oil
conductiveantifreeze
2Permissible operating temperature of the liquid, °:
- engine oil-45...+120
- antifreeze-45...+105
3Nominally the delay time (tZ.S.), s
- bottom0
- top4
4 Permissible ambient temperature, °-10...+45 (guaranteed accuracy);
+45...+70 (protection of health)
5Permissible humidity environment (at t 25+3°C)%98±2
6Genus voltageConstant (coeff. ripple less than 10%)
7Rated voltage (Ue)12; 24
8The permissible fluctuation of the voltage U1-2(0,9...1,25)Ue
9Rated current (Ie), A0,25
10The current consumption in the closed state (I0), mA25 max
11The load current in the closed state (Ir), mA1,5 max
12Type loadSignal filament indicator or electromagnetic relay

Production and release of the probe, according to the invention, manufacture of the applicant under the name "Sensor-hydrosilylation CSD", and its specifications meet the operational requirements for such devices and correspond to TU RB 100194961.059-2002. Table 2 shows the characteristics of the probes CSD different series.

№ p/pProduct designationPagrimex, VAInagrom,AndTkike.that °Properties of the controlled fluidThe switching operationTscem, s
1CSD-M-100-24-0160,25maloprodajaoff0
2CSD-M-110-24-0160,25maloprodajaenable0
3CSD-M-101-24-0160,25maloprodajaoff4
4CSD-M-111-24-0160,25maloprodajaenable4
5CSD-T-200-24-0160,25conductiveoff0
6CSD-T-210-24-0160,25conductive enable0
7CSD-T-201-24-0160,25conductiveoff4
8CSD-T-211-24-0160,25conductiveenable4
Legend: Rload loss. max- maximum power load; Iload loss. nom.- load current nominal; Tkike.- the temperature of the liquid; TSS nom.the delay time measuring nominal.

Sources of information:

1. A.c. SU # 1695139 A1, IPC5G01F 23/26, (22) 14.08.89, (46) 30.11.91. Bulletin, No. 44, (71) NGO "Roastmasters", (72) Sielecki, (54) "Capacitive compensation transmitter".

2. The US patent No. 3795146, IPC5G01F 23/26, (22) 12.05.1972, (45) 05.03.1974, (73) Vapor Corporation, Chicago, III, (75) Francis B, Wilson, Wauconda, III, "Reference signal differentiating capacitive fluid level gauge".

3. Patent RU No. 2054633 C1 IPC6G01F 23/26, 23/24, (22) 01.02.1993, (46) 20.02.1996, (71)(73) Kovrov Electromechanical plant, (72) Goncharenko, VA, Bursin A.P. and others, (54) "Capacitive sensor".

4. Patent RU No. 2000551 C1 IPC5G01F 23/26, (22) 01.02.1991, (46) 07.09.1993, bull. No. 33-36, (71)(73) FDI Measuring equipment (72) Sviridov A.I., Goodnew A.G. and others, (54) "Capacitive sensor".

5. Patent RU No. 218560 C1, IPC7G01F 23/24, 23/26, (22) 04.04.2001, (46) 20.07.2002, (71)(73) joint stock company "Special design Bureau of instrument engineering and automation, (72) Kulikov S.E., (54) "Capacitive level meter" (prototype).

1. Capacitive level meter liquids containing two-electrode capacitive sensor with internal and external electrodes electrically connected with an electronic circuit that includes a stabilized power supply, amplifier, generator and a trigger, wherein the capacitive sensor is made in the form of a coaxial capacitor internal electrode which is made tubular, is mounted within the bore of the probe and is connected to the input of additionally introduced into the circuit of the phase comparator, the output of which is connected to the input of the trigger, and the output of the latter is connected to the input of the trigger with delay line containing two outputs - the direct and inverse, which is connected with transistor key made with the ability to perform surgery "on" or "off", while the electronic circuit is a digital integrated circuit.

2. Capacitive level meter liquids containing two-electrode capacitive sensor with internal and external electrodes electrically connected with an electronic circuit that includes a stabilized power supply, amplifier, oscillator, and t is higher, characterized in that the capacitive sensor is made in the form of a coaxial capacitor internal electrode which is made tubular, is mounted within the bore of the probe and provided with a protective screen, while the inner electrode is connected to the input of the phase comparator is additionally introduced into the circuit, the output of the comparator is connected to the input of the trigger, and the output of the latter is connected to the input of a trigger, which is equipped with a delay line and provides two outputs - the direct and inverse, United transistor with a key made with the possibility of operation "on" or "off", while the electronic circuit is a digital integrated circuit.

3. Capacitive measuring device according to any one of claims 1 and 2, characterized in that the generator is arranged to generate a rectangular pulse.

4. Capacitive measuring device according to any one of claims 1 and 2, characterized in that the comparator is configured to convert the magnitude of the slope of the signal from the capacitive sensor in a phase shift which is detected by the trigger.

5. Capacitive measuring device according to any one of claims 1 and 2, characterized in that the external electrode of the coaxial capacitor is made in the form of a cylindrical housing in which is hermetically mounted steklotekstolity printed circuit ale is now electronic circuits of the meter.

6. Capacitive measuring device according to claim 2, characterized in that the protective screen is made in the form of coil springs made of bronze and is electrically connected with the external electrode of the coaxial capacitor, with PTFE probe with the inner tubular electrode coaxial capacitor placed asymmetrically inside the coil spring.



 

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