CS237112B1 - Device for electronic flow measurement of liquid medium - Google Patents

Abstract

The device for electronic measurement of the flow rate of a liquid medium comprises at least two chambers which are alternately filled from a common liquid supply through an open inlet valve and alternately emptied through an open outlet valve, whereby the resulting effect is an uninterrupted flow rate. The opening and closing of the valves is controlled electronically according to the amount of fluid being withdrawn, with the electrical switching responses being directly proportional to the flow rate and evaluated electronically. The device is suitable for measuring the flow rate from gravity tanks and from tanks from which the fluid is being sucked.

Description

237112 3 4

BACKGROUND OF THE INVENTION The present invention relates to a device for the electronic measurement of the flow rate of a fluid, preferably the measurement of the flow rate of fuel, which can be used to equip vehicles with the vehicles and trucks, for the purpose of control and consumption. Modern devices are known which provide optional information about the dynamic consumption mode, namely the fuel consumption per 100 km, the number of kilometers driven per liter of fuel and the consumption in liters per hour most frequently. All of this information needs to be evaluated by the flow sensor and its objectivity is dependent on the accuracy and reliability of the sensor as a crank element. The flow sensor is usually designed as a turbine blade, where the blades rotating with the fuel flow interrupts the radiant light flow. to which the pulse response of the optoelectronic receiver element corresponds. Also known is an axial turbocharger which modulates the bulb to the optoelectronic element by its body. Flow turbine sensors adversely affect the turbine inertia, thereby delaying at the start of a small flow and insensitive to a small flow in general. These flow sensors have the common disadvantage of having a low linearity in the number of pulses matching the flow. Another disadvantage of these is the narrow range of practical measurements that depend on the optimum flow rate of the fuel in the sensor. In low fuel flow, the sensors are sensitive to jerking suction of the fuel pump, to impurities, to mechanical removal of the turbine, which adversely affects the proportionality pulses at large and very low flow rates. The measured amount of fuel consumed per time or distance is practically unusable for the described disadvantage, despite the fact that it is practically impossible to use the electronic part with the present technology. Also, the indication of instantaneous consumption in the short-term interval is inaccurate if it is being manipulated with the accelerator pedal, but the actual average consumption may be 20 ° / one of the indicated.

The above mentioned drawbacks are eliminated by the invention, wherein the inlet device comprises at least two-valve valves from which the outlets open the lower part of at least two chambers and at least two outflow valves, the chambers being connected at the upper end and at least one of the chambers provided by the lower level sensor and at least one of the chambers is provided with at least one upper level sensor located above the horizontal plane of the lower sensor and further comprises at least one electronic evaluation circuit where logic The lower and upper sensors are variable in height in the chambers, while the lower and upper sensor outlets are connected to the inlet and outlet valves and to the evaluation of the fluid flow in the electronic evaluation circuit. time and distance intervals. The chambers can have different cross-sections in their own height intervals for optimum level detection in the chambers.

The higher effect of the device according to the invention is mainly based on qualitatively more objective information about the dynamic flow of the liquid flow, since the flow sensor is not based on the principle of flow of the rotating turbine, but is based on precise dosing and thus measurement of the unit amount of fluid. The device according to the invention adds and evaluates a constant selectable amount of fluid by the intermediate pulses, which is independent of the dynamic mode and is constant even if the flow is interrupted for a longer period. In the device according to the invention, no one-off occurrence occurs, and the arbitrary time interval between the two pulses is always an excellent amount of fluid. The higher effect of the device is also that it is possible to use absolute consumption for short and long distances as a measuring device, permanently built into passenger cars and trucks, as well as in buses. The exact consumption figure has a useful significance for economy and service delivery.

Fig. 1 shows an embodiment diagram of the invention, of which the functional activity is evident and which will be described in the specific embodiment. FIG. 2 illustrates a particular embodiment of the valve body, wherein the inlet and outlet ports of the inlet and outlet tubes exit into the stator part. Section A-A and B-B only illustrate the rotary part for clarity. Fig. 3 shows a flow sensor assembly with sensors and a drive motor.

A particular embodiment of the device is based on a functional scheme shown in FIG. 1. Through the valve VI, from below, a primer K1 is filled, from which the air escapes through the tube G into a chamber K2 which empties the overflow valve D2 on the basis of free flow or suction. The interconnecting tube G is provided at its ends with an annular seat 11, which is a flow-enclosed filling of the chamber with a floating ball or shaped float P1 and P2. After filling the first chamber K1 with the impulse, the bistable flip-flop circuit 2, whose output adjusted to the impulse is switched to the pulse counter in the evaluation unit 3, is flipped from the upper level sensor S2.

Claims (3)

SUBJECT Apparatus for electronic flow measurement of a liquid medium, comprising at least two chambers, preferably for measuring the flowing amount of fuel in motor units, characterized in that it comprises at least two inlet valves (VI, V2) at the inlet, outlets of which exit into the lower parts of at least two chambers (ΚΙ, K2) and at least two discharge valves (D1, D2j) at the same time, wherein the chambers (K1, K2) are connected at the upper end by at least one interconnected pipe (Gj) to prevent underpressure in the emptying chamber; of the chambers (ΚΙ, K2) is provided with a lower level sensor (S1J) and at least one of the chambers (ΚΙ, K2) is equipped with at least one upper level sensor (S2J) located above the horizontal plane of the lower level sensor (S1) evaluation circuit (3, 2, 1), where the logic state of the lower and upper level sensors (S1, S2) is variable by the level in the chamber ch (K1, K2J), whereby the outputs of the lower and upper level sensors (S1, S2) are coupled to both the inlet valve control (VI and V2J) and the input of the electronic evaluation circuit (3, 2, 1J) to evaluate the fluid flow in optional time and distance intervals. 2. Apparatus for electronic flow measurement according to claim 1, characterized in that the chambers (K1, K2) have different cross-sections within their own height for optimal sensing of the level in the chambers.