The method of determining the amount of liquefied gas in the container and the device for its implementation

 

(57) Abstract:

The inventive effect of magnetic field on the container with liquefied gas, measure the magnetic permeability of the container with liquefied gas and is determined by the calibration curve, the amount of liquefied gas in the tank, and the calibration curve obtained from the results of N measurements of the integral magnetic permeability corresponding to N different predetermined values of quantities of liquefied gas in the tank. The device comprises an inductor wound on a cylinder with liquefied gas and electrically isolated from it, the sinusoidal voltage generator, the generator pulses, the frequency divider, clock, electronic key, the pulse counter, the element OR NOT, the pulse shaper reset register, a decoder, an indicator. 2 C and 2 C. p. F.-ly, 6 ill.

The invention relates to measuring technique and is aimed at determining the amount of liquefied gas in the gas cylinder is used, for example, in devices for power supply of the motor vehicles of gaseous fuel stored in the liquid phase.

The closest analogues to the invention are a method and apparatus for MEAs elastic vessel, filled with liquid and having a vertical tube, the liquid level which is judged on the amount of gas.

A disadvantage of the known method and device is a strong dependence of the readings from vibrations and accelerations in the vertical direction, which virtually eliminates the possibility of the application of these inventions on a moving vehicle. The use of pressure gauges for supply of motor vehicles in liquefied natural gas uncomfortable, as their readings do not correspond to the amount of liquefied gas in the tank and, in addition, there is no possibility to monitor the readings from the cab of the vehicle is in motion.

In Fig. 1-3 shows three different versions of devices that implement the claimed method; Fig. 4 is an experimental graph of the inductance coil, the core of which is a container with liquefied gas, the amount of liquefied gas in the tank; Fig. 5 is a structural diagram of a device for measuring the amount of liquefied gas in a gas cylinder; Fig. 6 is a timing diagram of his work.

The method of determining the amount of liquefied gas in the gas tank is that the tank with liquefied gas is affected by the magnetic field, e.g. the Yu permeability of the container with liquefied gas. Before the actual measurement operations for calibration purposes, which include the dimension N of the informative parameter values corresponding to N different predetermined quantities of liquefied gas in the tank, according to the data from the gage curve, which determines the current amount of liquefied gas in the container during operation of the automobile engine.

Integral magnetic permeability of the container with liquefied gas can be measured by various methods.

From the integral values of the magnetic permeability of the container with liquefied gas depends on the inductance of the coil core, which is a container with liquefied gas (see Fig. 1). The method is implemented using coil 1 inductance covering the container 2 with liquefied gas, and 3 meter inductance, operating at low frequency (about 1 kHz).

Integral magnetic permeability of the container with liquefied gas is proportional to the amplitude of the magnetic flux through the cross-sectional area of the container with liquefied gas, if the amplitude of the intensity of the alternating magnetic field (see Fig. 2). On the 4 cylinder with liquefied gas is wearing a coaxial two coils 5 and MW in her winding of an alternating current from source 7 current. The second coil 6 serves for measuring the magnetic flux in accordance with the expression

U = -d /dt = -oW(dI/dt), where the integral magnetic permeability of the container;

o- magnetic constant;

W - factor;

I is the current through the coil 5;

U is the voltage on the coil 6;

the flow through the cross-sectional area of the balloon.

As a measuring device 8 can be used voltmeters amplitude, srednenapryazhennyh operating values, integrating voltmeters.

Measurement of magnetic flux through the cross section of the container with liquefied gas can be detected by measuring the magnetic field near the end of the cylinder (see Fig. 3). The method is implemented using attached to the cylinder 9 coil 10 connected to a source 11 of a current that creates a magnetic field of a given intensity. The sensor 12 to the magnetic field, which can be made on the basis of the Hall sensor, the vibrating coil, etc. located near the end face of the cylinder 9. The output signal of the sensor 12 is registered with the appropriate measuring instrument 13. The magnetic field generated by the coil 10, which in this case can be either a variable sound frequency, and constant.

In Fig. 1 shows achiev the NYM gas (see Fig. 1), the amount of liquefied gas in the tank calibration curve. From this graph it is seen that the inductance of the coil is uniquely related to the amount of liquefied gas in the tank. The measurements were performed at a frequency of 1 kHz. At high frequencies is the magnetic shielding internal volume of the container with its metal walls, therefore, the frequency range should be limited to audio frequencies.

Device for determining the amount of liquefied gas in the container contains the coil 14 of the inductor wound on a cylinder with liquefied gas and electrically isolated from it, the generator 15 sinusoidal voltage, the driver 16 pulses, the divider 17 frequency generator 18 clock pulses, an electronic key 19, the counter 20 pulses, the element OR NOT 21, the imaging unit 22 of the reset pulse, the register 23, a decoder 24 and the indicator 25.

Conclusions coil 14 of the inductance connected to the inputs of the generator 15 sinusoidal voltage, the output of which through the shaper 16 pulses connected to the input of the divider 17 frequency and the first input element OR NOT 21, a second input connected to the output of the divider 17 frequency control input of the electronic switch 19, the signal input of which 20 pulses, information outputs of counter 20 pulses through serially connected register 23 and the decoder 24 is connected to the inputs of the indicator 25 , the output of the element OR NOT 21 connected to the control input of the register 23 and through the imaging unit 22 of the reset pulse is connected to the reset input of the counter 20 pulses.

The device operates as follows. The coil 14 of the inductance is connected to the oscillatory circuit generator 15 sinusoidal voltage, which is fed to the input of the shaper 16 pulses (Fig. 6A). Shaper 16 pulses, which can be implemented by using a comparator or Schmitt trigger converts the sinusoidal signal into a rectangular pulse (Fig. 6b) of the same frequency. The divider 17 frequency generates pulses, the frequency of which is several times less than the frequency of the sinusoidal signal (Fig. 6b). These pulses open electronic switch 19, and through him start to pass pulses from the output of the generator 18 clock pulses (Fig. 6g). At the output of electronic switch 19, which may be made on the basis of element And formed packs of pulses (Fig. 6D). The number of pulses in each packet is counted by the counter 20 pulses and stored in the register 23 to the command from the output of the reset is formed by a short pulse (Fig. G), which erases the contents of the counter 20. The decoder 24 converts stored in the register 23 code to the control signals indicator 25, which in the simplest case can be a line of LEDs. If you change the quantity of liquefied gas in the tank varies integral magnetic permeability of the gas cylinder, and hence the inductance of the coil 14, the core of which is a container with liquefied gas. When changing the inductance of the coil 14 varies the frequency of oscillator 15 and, consequently, the number of clock pulses received at the input of the counter 20 pulses. The choice of the transformation function decoder 24 is a compliance indicator 25 quantity of liquefied gas in the tank. (56) French Patent N 230891, CL G 01 F 23/20, 1976.

THE METHOD OF DETERMINING THE AMOUNT OF LIQUEFIED GAS IN THE CONTAINER AND THE DEVICE FOR ITS IMPLEMENTATION

1. The method of determining the amount of liquefied gas in the tank, which consists in the fact that the measured N values informative parameter corresponding to N different predetermined quantities of liquefied gas in the tank, construct a calibration curve directly measure the value of the informative parameter and a calibration curve to determine the share of the m, the direction of which coincides with the longitudinal axis of the container with liquefied gas, and as an informative parameter selects the integral magnetic permeability of the container with liquefied gas.

2. The method according to p. 1, characterized in that the container with liquefied gas effect an alternating magnetic field of audio frequency and integral magnetic permeability of the container with liquefied gas is determined by measuring the inductance of the coil, the core of which is a container with liquefied gas, or amplitude of the magnetic flux through the cross-sectional area of the container with liquefied gas at the specified amplitude of the magnetic field.

3. The method according to p. 1, characterized in that the integral magnetic permeability of the container with liquefied gas is determined by measuring the magnetic field near the end of the container with liquefied gas.

4. Device for determining the amount of liquefied gas in the tank containing the sensing element and the indicator, characterized in that it introduced a sinusoidal voltage generator, the generator pulses, the frequency divider, clock, electronic key, a pulse counter, a register, a decoder, a pulse shaper, sbro the lawn with liquefied gas and electrically isolated from it, the leads of the inductor is connected to the inputs of the generator of sinusoidal voltage, the output of which through the pulse shaper is connected to the input of the frequency divider and the first input element OR NOT, a second input connected to the output of the frequency divider control input of the electronic key signal input which is connected to the generator output clock pulses, and the output of the electronic switch is connected to the input of the pulse counter, the information outputs of which are connected in series through the register and the decoder are connected to the inputs of the indicator, and the output of the element OR NOT connected to the control input of the register and through the pulse shaper reset is connected to the reset input of the pulse counter.

 

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