Device for measuring level

FIELD: measuring engineering.

SUBSTANCE: device comprises fuel level indicator and rheostat pickup made of an analogue-digital converter with the balance input. The three-position switch is connected with the lever indicator. The device additionally has three resistive dividers, voltage stabilizer, and shunting resistor made of a 0.003-0.006-Om resistor. The rheostat level pickup is mounted inside the fuel tank vertically, and its linear horizontal size at this level is directly proportional to the area of the tank section in the horizontal plane at this level.

EFFECT: expanded functional capabilities.

1 dwg

 

The invention relates to the field of fluid level control and can be used, in particular, to control the fuel level in the fuel tank of the vehicle.

The famous “Resistive sensor (see patent RU 2047843, publ. 10.11.1995,). The known device comprises two electrodes with different resistance measuring device, a power source and a variable resistor. The known device has a high measurement accuracy and increased functionality through the use of the known device as a stabilizer or unit level, however, the known device cannot be used in the car.

Known “temperature resistant detector liquid level (see patent RU 2185602, publ. 23.02.2001,). The known device comprises a power supply, a level sensor located in the fuel tank, comparator, analog-to-digital Converter. The known device allows you to monitor the fuel level only in the fuel tank of the aircraft.

Known for measuring the fuel level in the fuel tank of the vehicle (see Reznik A. M. and others “Electric cars”. M.: Transport, 1988, pp. 102-105), is selected as the closest analogue. The known device consists of a sensor that is installed in the fuel tank, and the pointer on the instrument panel of the vehicle, as the cat is, which apply electromagnetic and magneto-electric devices. As the sensor is used rheostat sensor. Winding wound rheostat textolite plate, with one end of the winding connected to the housing. The scale pointer is tagged in the fractional volume of the tank 0,,,, P.

However, measurement error in the known meter fuel level is quite high, primarily because of the location of the resistance of the sensor in the tank car, and also forms the plate resistance of the sensor, on which is wound the coil of the rheostat.

Solved by the invention, the task consists in the following. You must create a device for measuring the fuel level in the tank car, allowing you to measure the amount of fuel in the tank with a 2% accuracy +/- 1 unit LSB measuring device, and also allows you to measure the battery voltage of the vehicle to detect a malfunction of the relay-regulator, generator failure, malfunction starter (short circuit).

The essence of the invention lies in the fact that in addition to the well-known and common features, namely the fuel gauge, the resistance level sensor included between the level indicator and a shared bus, the device that contains the index level and the resistance level sensor included between the level indicator and a shared bus, ka is este pointer level using an analog-to-digital Converter with balanced input, and, optionally, in the device entered controlled three-position switch connected to the level indicator, the first, second and third resistive dividers, voltage regulator and shunt resistor, the first resistor divider connected between the positive bus and the common bus, the input of the voltage regulator is connected to the positive bus, a second resistive divider connected between the output voltage and the resistance of the level sensor, the third resistive divider connected between the output voltage and a common bus, a shunt resistor connected between the negative bus and the common bus, the first mentioned stationary contact of the switch is connected to the output of the first resistive divider, the second with the output of the second resistive divider, a third negative bus and one output shunt resistor, the fourth and sixth stationary contacts are interconnected and connected to the shared bus, and the fifth stationary contact is connected to the output of the third resistive divider, with a shunt resistor is made on the resistor 0,003 - 0,006 Ohm rheostat level sensor placed in the fuel tank vertically, and the linear size of the rheostat level sensor horizontal at this level is directly proportional to the sectional area of the tank in a horizontal plane on the level.

The use of analog-to-digital Converter (ADC) with balanced input allows not only to reduce to zero the error of measurement of the quantity of fuel in the tank at the beginning (empty tank) and at the end (full tank) scale, but also allows you to measure the amount of fuel with 2% accuracy +/- 1 unit, and also to extend the functionality of the device.

The introduction of the first resistive divider allows you to use the ADC to measure voltage on-Board network of the vehicle as the vehicle voltage of the vehicle is changed in the range of 12-14, and the sensitivity of the ADC is not higher than 1 V. the voltage Regulator and the second resistive divider are the generator voltage to the resistance of the level sensor. The introduction of the third resistive divider allows you to create a compensating voltage to the balanced input of the ADC. The balanced input of the ADC allows to reduce the measurement error to zero at the beginning and end of the scale. As ADC you can use, for example, the chip CREW. Information in digital form is displayed on the indicator, consisting of four seven-segment led indicators. As resistors can be used, for example, resistors MLT. As variable resistors can be used, for example, resistors type SP5-VB.

Implementation plate rheostat level sensor with a linear size of a plate, pogorizontali at this level, directly proportional to the sectional area of the tank in a horizontal plane at a given level, and the location of the resistance of the level sensor in the tank car vertically minimizes the inaccuracy of the claimed device in secondary scale range. This has been proved by tests of the claimed device, conducted by the authors. In the result of testing, it was found that if the shunt resistor is made on the resistor 0,003-0,006 Ohms, the measurement error of the current starter is 10%, and this allows you to detect faulty starter or battery.

The essence of the inventive device is illustrated in the drawing, which presents a schematic diagram of a device.

The inventive device comprises a resistive divider 1, the resistive divider 2, the resistive divider 3, the stabilizer 4 voltage, three-position switch 5, ADC 6, the shunt resistor 7, rheostat sensor 8 level, the positive bus 9, and the negative bus 10, bus 11. The resistive divider 1 consists of a serially connected resistor 12, the variable resistor 13 and resistor 14, while free of the resistor 12 is connected to the positive bus 9 and the input of the stabilizer 4 voltage-free output resistor 14 is connected with the common bus 11, and a common connection point of the variable resistor 13 and the resistor is 14 connected with the first fixed contact (5.1) switch 5. The resistive divider 2 consists of a serially connected resistor 15 and a variable resistor 16, with free of the resistor 15 is connected to the output of the voltage stabilizer 4 and the free output of the variable resistor 16 is connected to the second stationary contact (5.2) switch 5 and one output rheostat sensor 8 level, the other output of which is connected to the common bus 11. The resistive divider 3 consists of a serially connected resistor 17, a variable resistor 18 and resistor 19, while free of the resistor 17 is connected to the output of the stabilizer 4 voltage-free output resistor 19 is connected with the common bus 11, and the connection point of the variable resistor 18 and resistor 19 is connected with a fixed contact (5.5) switch 5. The third stationary contact (5.3) switch 5 is connected to the negative bus 10 and one output resistor 7, the other output of which is connected to the common bus 11. The fourth (5.4) and sixth (5.6) the stationary contacts of the switch 5 are connected with the common bus 11. The first movable contact (5.7) switch 5 is connected to the inverting input of the ADC 6 and the second movable contact (5.8) switch 5 is connected to reinvestiruet the ADC input 6.

The device operates as follows.

Rheostat sensor 8 of the fuel accommodated in the fuel tank (not shown) vertical is real. The power source is the vehicle battery or generator (not shown). When installing the switch 5 to 5.2 analog signal voltage across the rheostat sensor 8 level, immersed in the liquid, flows through the closed contact pair of the switch 5 input ADC 6 and after conversion to digital form is transmitted to an indicator (not shown). The indicator shows the amount of fuel in the fuel tank as when the vehicle is moving, and during stop of the vehicle.

If with the engine off set switch 5 to 5.1, then the indicator will show the battery voltage. And when the engine indicator will show the voltage generator supplying the onboard network of the car. Thus it is possible to detect the following faults: relay-regulator and generator (voltage deviation of the generator from the norm indicates a malfunction of the generator). If during the engine start switch 5 to 5.3, the indicator shows the current starter. If the current is less than normal, it indicates a malfunction of the battery, and if more is wrong with the starter motor winding short circuit).

Thus, the proposed device allows for Express-diagnostics of the vehicle by the driver and quickly is yavit violation of adjustments of the engine and fuel system of the vehicle.

Since the accuracy of the claimed device is 2% +/- 1 unit (and it was determined during testing), you can notice increased fuel consumption. When this was revealed specific benefits when using devices such as buses or trucks. Enterprises working in different shifts, it is possible to precisely control the remnants of gasoline when the transmission shifts, since control is carried out on the level of fuel in the tank and not on the value of the mileage of the car.

Thus, the inventive device not only provides a higher (compared to the prototype) precision measurement of fuel level in the tank, but also has an extended functionality.

The inventive device has been tested in real conditions on the car VAZ-2102”. Tests showed high reliability in operation. The cost of the device low, and it can be used on other vehicles.

Device for measuring the level containing the index level and the resistance level sensor included between the level indicator and a common bus, wherein the quality level indicator using analog-to-digital Converter with balanced input and optionally, in the device entered managing three-position switch connected to the level indicator, p is pout, the second and third resistive dividers, voltage regulator and shunt resistor, the first resistor divider connected between the positive bus and the common bus, the input of the voltage regulator is connected to the positive bus, a second resistive divider connected between the output voltage and the resistance of the level sensor, the third resistive divider connected between the output voltage and a common bus, a shunt resistor connected between the negative bus and the common bus, the first mentioned stationary contact of the switch is connected to the output of the first resistive divider, the second output of the second resistive divider, a third negative bus and one output shunt resistor, the fourth and sixth stationary contacts are interconnected and connected to the shared bus, and the fifth stationary contact is connected to the output of the third resistive divider, with a shunt resistor is made on the resistor 0,003-0,006 Ohm rheostat level sensor placed in the fuel tank vertically, and the linear size of the rheostat level sensor horizontal at this level is directly proportional to the sectional area of the tank in a horizontal plane at this level.



 

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