CN102735305A - Fuel measuring device controlled by servo motor - Google Patents

Abstract

The invention discloses a fuel measuring device controlled by a servo motor. In the device, one end of a connecting rod is connected with a rack through a spring, and the other end is connected with a piston through a piston pin. A displacement sensor measures the displacement of the connecting rod, and the piston is placed in a measuring cylinder. Inside, the bottom of the measuring cylinder, the oil outlet pipe and the oil inlet pipe are connected through an electromagnetic three-way valve, the pressure sensor is installed on the oil outlet pipe, the pressure sensor and the servo motor are connected with the electronic control unit, and the gear is fixed on the output shaft of the servo motor , and meshed with the rack; the invention is used to measure the fuel consumption of the engine without disassembling the fuel tank, and the operation is convenient and simple; the electronic control unit directly adjusts and controls the motor to keep the oil pressure stable, the measurement data is accurate, and the work is stable; the invention does not need The oil circuit system of the engine or other oil consumption devices is modified, and the structure has strong versatility and wide application.

Description

A fuel measuring device controlled by a servo motor

technical field

The invention relates to a fuel measuring device, in particular to a fuel measuring device controlled by a servo motor.

Background technique

At present, there is no very ideal instrument for fuel consumption measurement, and the "weighing method" or direct measurement of the liquid level of the fuel tank of the locomotive is mainly used. The former method needs to fill the oil barrel with oil and weigh the quality and fix it on the machine before the test, then insert the fuel inlet and return pipe of the engine into it, start the engine and test it immediately, turn off the engine after the test is completed, and remove the oil barrel Weigh its quality, divide the difference between the quality before and after the test by the time to determine the fuel consumption per unit time or divide it by the workload to determine the fuel consumption per unit workload. This test method has large measurement errors due to oil dripping and oil leakage during assembly and disassembly, and the measurement is inconvenient and has large errors. The latter method uses a general liquid level sensor to measure the fuel tank of the locomotive. Since the vehicle starts to vibrate greatly, the data error will be large and it will be very unstable.

Contents of the invention

The object of the present invention is to provide a fuel measuring device controlled by a servo motor to address the deficiencies in the prior art.

The object of the present invention is achieved through the following technical solutions: a fuel measuring device controlled by a servo motor, which includes: a rack, a spring, a displacement sensor, a connecting rod, a piston, an oil outlet pipe, an electromagnetic three-way valve, an oil inlet Oil pipes, pressure sensors, measuring cylinders, electronic control units, servo motors and gears, etc.; wherein, one end of the connecting rod is connected to the rack through a spring, and the other end is connected to the piston through a piston pin. The displacement sensor measures the displacement of the connecting rod, and the piston Placed in the measuring cylinder, the bottom of the measuring cylinder, the oil outlet pipe and the oil inlet pipe are connected through the electromagnetic three-way valve, the pressure sensor is installed on the oil outlet pipe, the pressure sensor and the servo motor are connected with the electronic control unit, and the gear is fixed on the servo motor. on the output shaft and meshes with the rack.

The beneficial effects of the present invention are:

1. There is no need to disassemble the fuel tank, and the operation is convenient and simple;

2. The electronic control unit directly adjusts and controls the motor to keep the oil pressure stable, the measurement data is accurate, and the work is stable;

3. There is no need to modify the oil circuit system of the engine or other fuel consumption devices, and the structure has strong versatility and wide application;

4. Simple structure and low manufacturing cost.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the installation schematic diagram of gear and motor of the present invention;

Fig. 3 is the working schematic diagram of electronic control unit of the present invention;

In the figure: rack 1, spring 2, displacement sensor 3, connecting rod 4, piston 5, piston pin 6, oil outlet pipe 7, electromagnetic three-way valve 8, oil inlet pipe 9, pressure sensor 10, measuring cylinder 11, electronic control Unit 12, servo motor 13, gear 14.

Detailed ways

The purpose and effects of the present invention will become more apparent by referring to the accompanying drawings in detail of the present invention.

As shown in Figures 1 and 2, the fuel measuring device controlled by a servo motor of the present invention includes: a rack 1, a spring 2, a displacement sensor 3, a connecting rod 4, a piston 5, an oil outlet pipe 7, an electromagnetic three-way valve 8, an inlet Oil pipe 9, pressure sensor 10, measuring cylinder 11, electronic control unit 12, servo motor 13, gear 14.

One end of the connecting rod 4 is connected to the rack 1 through the spring 2, and the other end is connected to the piston 5 through the piston pin 6. The displacement sensor 3 measures the displacement of the connecting rod 4. The piston 5 is placed in the measuring cylinder 11. The bottom of the measuring cylinder 11, the oil outlet The oil pipe 7 and the oil inlet pipe 9 are connected through the electromagnetic three-way valve 8, the pressure sensor 10 is installed on the oil outlet pipe 7, the pressure sensor 10 and the servo motor 13 are connected with the electronic control unit 12, and the gear 14 is fixed on the output of the servo motor 13. shaft and meshes with rack 1.

As shown in Figure 3, the pressure sensor 10 sends a pressure signal to the electronic control unit, and the electronic control unit 12 can be realized by a single-chip microcomputer or DSP, which converts the pressure signal sent by the pressure sensor 10 into a control signal, and sends the control signal to the servo motor 13, the servo motor 13 drives the gear 14 to rotate, and then achieves the purpose of controlling the speed of the gear 14.

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。 The working process of the present invention is as follows: before the engine is started, the electromagnetic three-way valve 8 is first adjusted, the oil inlet pipe 9 and the measuring cylinder 11 are connected, and the oil outlet pipe 7 is blocked. Due to the oil pressure of the oil inlet pipe 9, the measuring cylinder 11 Gradually fill up with fuel. When the measuring cylinder 11 is full, adjust the electromagnetic three-way valve 8 to connect the oil inlet pipe 9 and the oil outlet pipe 7, and then start the engine normally (not shown in the figure). When the fuel consumption needs to be measured, adjust the electromagnetic three-way valve 8 again, so that the measuring cylinder 11 is connected to the oil outlet pipe 7, and at the same time start the servo motor 13 to drive the gear 14 to rotate, and then drive the rack 1 to move downward, and the direction of the rack 1 The downward movement compresses the spring 2, and the compression of the spring 2 makes the connecting rod 4 move downwards to drive the piston to move, and finally a certain oil pressure is generated in the measuring cylinder 11. Under the effect of oil pressure, the fuel oil flows to the oil outlet pipe 7 and then flows into the engine to ensure the normal operation of the engine. The pressure sensor 10 measures the pressure of the fuel flowing out of the measuring cylinder 11 and sends it to the electronic control unit 12. When the pressure is greater than the original pressure of the oil inlet pipe 9, the electronic control unit 12 sends a control signal to order the servo motor 13 to decelerate and rotate. When the pressure of the oil inlet pipe 9 is reached, the electronic control unit 12 sends a control signal to order the servo motor 13 to accelerate the rotation, and then adjust the rack 1 to accelerate and decelerate downward, so as to keep the oil pressure in the measuring cylinder 11 stable at the original pressure of the oil inlet pipe 9 near the value. The spring 2 acts as a buffer against the force from the rack 1, avoiding the direct action on the connecting rod 4 and causing sudden rise and fall of the oil pressure, so as to keep the oil pressure stable. In this way, after waiting for the engine to work for t seconds, the displacement of the connecting rod 4 is read by the displacement sensor 3, that is, the displacement h of the piston 5, thus the total volume of fuel consumed in the t seconds can be obtained:

, and A is the cross-sectional area of the graduated cylinder. Then it can be obtained that the fuel consumption per unit time is

.

Claims (1)

1. A fuel measuring device controlled by a servo motor, characterized in that it includes: a rack (1), a spring (2), a displacement sensor (3), a connecting rod (4), a piston (5), and an oil outlet pipe (7), electromagnetic three-way valve (8), oil inlet pipe (9), pressure sensor (10), measuring cylinder (11), electronic control unit (12), servo motor (13) and gear (14), etc.; , one end of the connecting rod (4) is connected to the rack (1) through the spring (2), and the other end is connected to the piston (5) through the piston pin (6), and the displacement sensor (3) measures the displacement, the piston (5) is placed in the measuring cylinder (11), the bottom of the measuring cylinder (11), the oil outlet pipe (7) and the oil inlet pipe (9) are connected through the electromagnetic three-way valve (8), and the pressure sensor (10) is installed On the oil outlet pipe (7), the pressure sensor (10) and the servo motor (13) are connected with the electronic control unit (12), and the gear (14) is fixed on the output shaft of the servo motor (13), and is connected with the rack (1) meshing.

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