Revolving speed measuring system for electronic fuel pump and speed measuring method thereof

Abstract

The invention discloses a revolving speed measuring system for an electronic fuel pump. The revolving speed measuring system for the electronic fuel pump comprises a pressure sensor, a filter and revolving speed calculating equipment. The pressure sensor is used for measuring and obtaining a pressure change time-domain curve of an oil outlet of the electronic fuel pump. The filter is used for eliminating the pressure corresponding to a direct current component and retaining the pressure corresponding to an alternating current component according to filtering of the pressure change time-domain curve of the electronic fuel pump and obtaining a pressure change time-domain sine curve, and the maximum pressure fluctuation amplitude is represented by the peak value or the valley value of the pressure change time-domain sine curve. The revolving speed calculating equipment is used for calculating and obtaining the effective value, namely pressure fluctuation, of the maximum pressure fluctuation amplitude. The pressure change time-domain curve is changed to obtain a pressure fluctuation frequency-domain curve, the corresponding first-order pressure fluctuation frequency is obtained according to the first-order pressure fluctuation frequency amplitude, and the revolving speed of the fuel pump is calculated and obtained through the first-order pressure fluctuation frequency. The invention further provides a revolving speed measuring method for the electronic fuel pump. The revolving speed measuring system for the electronic fuel pump and the speed measuring method thereof are not interfered by surrounding equipment, and speed measuring is quick and accurate.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an electronic fuel pump speed measuring system. The invention also relates to a method for measuring the rotational speed of the electronic fuel pump. Background technique [0002] Electronic fuel pump is a term in the auto parts industry. It is one of the basic components of EFI automobile fuel injection system. The function of the electronic fuel pump is to suck the fuel out of the fuel tank, pressurize it and deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure. When the rotor disk of the electronic fuel pump rotates, the roller is pressed outward by the centrifugal force, like a rotating oil seal, the rotor rotates, the pump works, sucks fuel from the oil inlet, and presses the fuel into the fuel system from the oil outlet. [0003] The motor part of the impeller type electronic fuel pump is composed of a stator ...

AI Technical Summary

Problems solved by technology

[0009] 1. It is necessary to purchase wheel speed sensors and corresponding hardware equipment, which is expensive;

[0010] 2. During the test, the wheel speed sensor must be placed within a certain range from the axial and radial directions of the fuel pump. The test is limited by conditions and the scope of application is limited.

[0011] 3. Since the pump casing of the fuel pump is made of metal, and the support cover of some fuel pumps has metal shielding caps to reduce electromagnetic radiation, the electromagnetic signal inside the fuel pump is greatly weakened, resulting in the The signal is relatively weak, which will eventually affect the accuracy of the actual measurement

[0014] 1. Influence of fuel pump reversing system

For example, the appearance of the surface of the carbon brush or armature commutator, the height difference between the commutator petals, and the commutation gap between the commutator petals, all of which will affect the current waveform and cause inaccurate measurement. ;

[0015] 2. The influence of equipment power supply

Because the voltage and current signals come from the DC regulated power supply of the test bench, the stability of the DC regulated power supply will also affect the acquisition of current signals, affect the current waveform diagram, and cause inaccurate measurement;

[0016] 3. When the fuel pump is working, it is a complicated dynamic process. In addition to the movement of the rotor armature, there is also the fluid impact of the fuel, so there are periodic changes in the load, which will inevitably lead to some periodic jumps in the current waveform diagram, which will affect the speed measurement. the accuracy of

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