System control the degree of water content of diesel fuel

 

(57) Abstract:

Use: automatic control of internal combustion engines. The invention is: to increase the sensitivity, noise immunity and reliability of the system is equipped with a shielded capacitive sensor 1, which contains two groups of electrodes on the surface of which is deposited a film of a dielectric coating. In series with the capacitive sensor is connected an adjustable inductor 16, forming a capacitive sensor series resonant circuit. When the flow through the capacitive sensor clean fuel or fuel concentration in which the water within the tolerance, the resonant circuit does not resonate. During the flow of fuel, the concentration of water which is equal to the lower limit of tolerance, the circuit resonates, the voltage on capacitance of the sensor increases. This voltage capacitive sensor 1 is supplied through an amplifier 17 to the input of logic expander 18, not inverting the output of which is connected the winding 20 of the electromagnetic valve 19, the valve closes, stopping the flow of flooded fuel into the engine. 2 C. p. F.-ly, 2 Il.

The invention relates to auth the falling water in the cylinders [1] the measuring circuit which is made in the form of two generators of electric oscillations, connected in parallel to the two capacitive sensors, amplification-conversion device formed by frequency dividers, a comparison circuit, a multivibrator and amplifier. The input of the amplifier-Converter device connected to the output of the measuring circuit, and the output to the Executive body in the form of an electromagnetic valve installed in the fuel line.

However, the known system has a lower sensitivity than the allowable fuel, low immunity and, therefore, lack of reliability.

The purpose of the invention the increased sensitivity allows the detection of water in the fuel within the lower tolerance, improving the noise immunity and increase reliability.

To do this, the system is equipped with capacitive noise sensor having a metal shielding with fittings case, which establishes isolated from each other, two groups of metal electrodes having a dielectric coating, each group of electrodes is connected with the conclusions fixed through insulators on the housing and through the findings from the measuring circuit. The measuring circuit has an adjustable coil ind what neration electrical oscillations. The measuring system is equipped with an amplifier, whose input is connected to the capacitive sensor, and the output to the input of the expander, and a non-inverting output of the expander is connected to the winding of the Executive body in the form of an electromagnetic valve.

In Fig. 1 presents a diagram of the capacitive sensor of Fig. 2 schematic diagram of the system control the degree of water content of diesel fuel.

System control the degree of water content of diesel fuel consists of a capacitive sensor 1 (Fig. 1) having a metal shielding housing, the inner housing 2 of dielectric material, group of metallic electrodes 3, covered by a dielectric, electrically interconnected by means of a screw 4, connected to the output 5, fixed to the body 1 through the insulator 6, the group of metallic electrodes 7, is covered with a dielectric and electrically interconnected by means of a screw 8, which is connected to the output 9, fixed to the body 1 through the insulator 10; a group of electrodes 3 and 7 through insulators 11 and 12 are interconnected; an input 13 and an output 14 of the fittings.

Electrical system diagram (Fig. 2) consists of a generator 15, the capacitive sensor 1, an adjustable inductor 16, the CA shall Deposit with the load resistor 22, indicator led 23 red glow with a load resistor 24.

Capacitive sensor 1 and an adjustable inductor 16 form a series resonant circuit.

The system works as follows.

The generator 15 produces a stable frequency electromagnetic oscillations applied to the serial circuit of the capacitive sensor 1, the inductor 16. When the flow through the capacitive sensor 1 clean fuel by means of the variable inductance circuit 16 is configured so that the resonance does not occur.

On capacitive sensor 1 is relatively small voltage drop, this voltage is applied to the input of the amplifier 17, and with its output to the input of the expander 18. This voltage is insufficient to trigger logic circuit expander, resulting in her reinvestiruet output has a logical zero, and for inverting the output of the logical unit. To the inverting output of the logical circuit of the expander 18 through a load limiting resistor 22 is connected, the led 21, which is displayed when passing through the capacitive sensor 1 clean fuel.

The system is configured as lower limit. Using an adjustable inductor 16, the circuit is tuned to resonance, the capacitive sensor voltage increases and is fed to the input of amplifier 17, and with its output to the input of the expander 18, reinvestiruet output extender, you receive the voltage of the logic unit. This voltage is applied to the winding 20 of the electromagnetic valve 19, the valve closes, stopping the flow of flooded fuel and the engine. At the same time displayed the led 23 red glow.

Configured this way system after removal of the capacitive sensor control flooded fuel with maximum permissible concentration of water is included in the fuel system of the internal combustion engine.

Thus, the proposed system controls the degree of flooding of diesel fuel provides reliable protection of the internal combustion engine from getting flooded fuel, water concentration which exceeds the lower permissible limit.

1. SYSTEM control the DEGREE of WATER content of DIESEL FUEL containing the measuring circuit with a generator of electric oscillations and the capacitive sensor, amplification-preobrazovaneiyakh in the form of an electromagnetic valve, installed in the fuel line, wherein the capacitive sensor is noiseless and has a metal shielding with fittings case, which establishes isolated from each other, two groups of metallic electrodes with a dielectric coating, each of which is connected with the conclusions fixed through insulators on the housing, and the measuring circuit has an adjustable inductor, forming a capacitive sensor serial resonant circuit, is connected to a generator of electrical oscillations.

2. The system under item 1, characterized in that the measuring circuit is supplied by the amplifier, whose input is connected to a capacitive sensor.

3. The system under item 2, characterized in that the measuring circuit is supplied with the extender, the inlet of which is connected to the output of the amplifier and non-inverting output to the winding of the Executive body.

 

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