JPH11315771A - Inspection system for noise by discharge pulse of electric fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately determine the quality of an electric fuel pump. SOLUTION: The determination system determines the quality of an electric fuel pump based on pulse pressure relative to pulse frequency obtained by an analyzer. The determination system is provided with primary component pulse frequency setting means 21, first peak value detecting means 22 which detects the pulse pressure peak value in a predetermined frequency range including the pulse frequency of each higher- degree order component for every higher-degree order, second peak value detecting means 23 which detects the pulse pressure peak value in the frequency range outside of the predetermined frequency range including the pulse frequency of each higher- degree order component for every higher-degree order, peak difference calculating means 24 which calculates the difference of the pulse pressure peak values for every higher-degree order, peak difference total value calculating means 25 which calculates the total value of the peak difference which is the positive value in each peak difference, and quality determining means 26 which compares the peak difference total value with a predetermined reference value and which determines the electric fuel pump to be defective when the peak difference total value is larger than the reference value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus for inspecting noise due to discharge pulsation of an electric fuel pump and judging the quality of the electric fuel pump.

[0002]

2. Description of the Related Art Conventionally, an apparatus for inspecting noise due to discharge pulsation of an electric fuel pump has a pressure sensor for detecting a discharge pulsation pressure of the electric fuel pump, and a pulsation pressure corresponding to a pulsation frequency based on a discharge pulsation pressure signal from the pressure sensor. And a determination device for determining the quality of the fuel pump based on the pulsation pressure with respect to the pulsation frequency obtained by the analyzer, wherein the determination device has a pulsation pressure peak value at the pulsation frequency of the first order component. If the electric fuel pump is larger than a predetermined reference value, the electric fuel pump is determined to be defective.

[0003]

However, the order 1
Even when the pulsation pressure peak value at the pulsation frequency of the next component is smaller than the reference value, there is a large noise product due to the impeller blade chipping of the electric fuel pump, and a large noise product even without the impeller blade chipping. According to the conventional inspection apparatus, it is difficult to accurately determine the quality of these electric fuel pumps.

[0004] It is an object of the present invention to solve the above problems and to provide an inspection device capable of accurately determining the quality of an electric fuel pump.

[0005]

According to the present invention, there is provided an apparatus for inspecting noise due to discharge pulsation of an electric fuel pump, comprising: a pressure sensor for detecting a discharge pulsation pressure of the electric fuel pump; and a discharge pulsation pressure signal from the pressure sensor. An analyzer for determining a pulsation pressure with respect to a pulsation frequency, and a noise inspection device for noise due to discharge pulsation of the electric fuel pump, comprising: a determination device for determining the quality of the electric fuel pump based on the pulsation pressure with respect to the pulsation frequency obtained by the analyzer; The determination device includes a primary component pulsation frequency setting unit that sets a pulsation frequency of a first-order component based on a pulsation pressure with respect to the pulsation frequency obtained by the analyzer, and an order set by the primary component pulsation frequency setting unit. Based on the pulsation frequency of the first-order component, the pulsation frequency of the higher-order component is included for each higher order. A first peak value detecting means for detecting a pulsating pressure peak value in a predetermined frequency range; and a pulsating frequency of a first-order component set by the first-order pulsating frequency setting means. Second peak value detecting means for detecting a pulsating pressure peak value in a frequency range other than the predetermined frequency range including the pulsating frequency of the higher order component, and the first peak value detecting means for each higher order. A peak difference calculating means for calculating a difference between the pulsating pressure peak value and the pulsating pressure peak value detected by the second peak value detecting means; and a positive value among the peak differences calculated by the peak difference calculating means. A peak difference total value calculating means for calculating a total value of the peak differences, and a peak difference total value calculated by the peak difference total value calculating means is compared with a predetermined reference value to determine a peak value. If the sum is greater than the reference value, characterized in that it comprises a determining quality determination means the electric fuel pump defective.

[0006]

FIG. 1 is a block diagram of an inspection apparatus according to an embodiment of the present invention, FIG. 2 is a functional block diagram of a determination apparatus in the inspection apparatus, and FIGS. FIG. 5 is an explanatory diagram for explaining the processing contents of the device, and FIG. 5 is an explanatory diagram of a determination result by the determination device.

In FIG. 1, 1 is an electric fuel pump to be inspected, 2 is a power supply of the electric fuel pump 1,
A reference numeral 3 for applying a drive voltage of, for example, 14 V to the electric fuel pump 1 denotes a pseudo fuel that is drawn into and discharged from the electric fuel pump 1.

A fuel passage 4 is connected to a discharge port 1 a of the electric fuel pump 1. A sensor pipe 6 having a passage 5 bent at a right angle is disposed in the fuel passage 4.
A pressure sensor 7 for detecting a discharge pulsation pressure of the electric fuel pump 1 is provided in the sensor pipe 6. The pressure sensor 7 is located at a predetermined distance, for example, 150 mm from the discharge port 1 a of the electric fuel pump 1. A regulator 8 is provided in the fuel passage 4.

An FF is connected to the pressure sensor 7 via an amplifier 9.
T (Fast Fourier Transform)
An analyzer 10 is connected. FFT analyzer 1
0 is based on the discharge pulsation pressure signal from the pressure sensor 7,
The pulsation pressure with respect to the pulsation frequency (see the graphs of FIGS. 3 and 4 (the graphs of FIGS. 3 and 4 are the same graph)) is obtained. A personal computer 11 as a determination device is connected to the FFT analyzer 10. The personal computer 11 uses the FFT
The quality of the electric fuel pump 1 is determined based on the pulsation pressure with respect to the pulsation frequency obtained by the analyzer 10.

The personal computer 11 is functionally configured as shown in FIG. In FIG. 2, the personal computer 11 includes a primary component pulsation frequency setting means 21, a first peak value detecting means 22, a second peak value detecting means 23, a peak difference calculating means 24, a peak difference total value calculating means 25, and a pass / fail judgment. Means 26.

The primary component pulsation frequency setting means 21 includes an FF
The pulsation frequency of the first order component (basic pulsation frequency) is set based on the pulsation pressure with respect to the pulsation frequency obtained by the T analyzer 10. Here, the pulsation frequency of the first-order component (basic pulsation frequency) is, for example, a pulsation frequency having a pulsation pressure peak value in a pulsation frequency range from 70.00 Hz to 110.00 Hz as shown in FIG. In the case of the graph of FIG. 3, the pulsation frequency (basic pulsation frequency) of the first-order component is 77.50 Hz.

The first peak value detecting means 22 is provided for each higher order based on the pulsation frequency (basic pulsation frequency) of the first order component set by the first order component pulsating frequency setting means 21. Pulsating pressure peak value in a predetermined frequency range including the pulsating frequency of the next component (first pulsating pressure peak value)
Is to be detected.

Here, the pulsation frequency of the higher-order component is a pulsation frequency obtained by doubling the pulsation frequency of the first-order component (basic pulsation frequency) for the second-order component. , The fourth-order component,..., The pulsation frequency (basic pulsation frequency) of the first-order component is 3
.., 4 times,... For example, in the case of the graph of FIG. 3, the pulsation frequencies of the second-order component, the third-order component, the fourth-order component,..., The thirteenth-order component are the pulsation frequencies of the first-order component of 77.50 Hz (basic pulsation). , 15 × 20 Hz, 232.50 Hz, 3 × 2 ×, 3 ×, 4 ×,.
, 1007.50 Hz.

The predetermined frequency range including the pulsation frequency of the higher-order component is provided in consideration of the error of the pulsation frequency that takes the first pulsation pressure peak value in each higher-order component. It is set in the range of ± 20 Hz around the pulsation frequency of the next component. For example, in the case of the graphs shown in FIGS. 3 and 4, the predetermined frequency ranges including the pulsation frequencies of the second-order component, the third-order component, the fourth-order component,..., The thirteenth-order component are 57.50 Hz, respectively. From 97.50 Hz to 135.00 Hz to 1
Range up to 75.00 Hz, 212.50 Hz to 25
Range up to 2.50 Hz, ..., 987.50 Hz to 1
The range is up to 027.50 Hz.

For example, in the case of the graphs of FIGS. 3 and 4, the first pulsation pressure peak value in a predetermined frequency range including the pulsation frequency of the higher-order component is the second-order component, the third-order component, and the fourth-order component. , The pulsation frequency (first peak frequency) of the 13th-order component is 155.00, respectively.
-66.75 dB at Hz, pulsation frequency (first peak frequency) -83.75 dB at 240.00 Hz
B, pulsation frequency (first peak frequency) 315.00 Hz
-82.75 dB at ..., pulsation frequency (first peak frequency) -93.75 Hz at 997.50 Hz
(See Table 1 below).

The second peak value detecting means 23, based on the pulsation frequency (basic pulsation frequency) of the first-order component set by the first-order component pulsation frequency setting means 21, for each higher order, A pulsation pressure peak value (second pulsation pressure peak value) in a frequency range other than the predetermined frequency range including the pulsation frequency of the next component is detected.

Here, the frequency ranges other than the predetermined frequency range including the pulsation frequency of the higher-order component are, for example, in the case of the graphs shown in FIGS. 3 and 4, the second-order component, the third-order component, and the fourth-order component. ,..., 13th-order components, respectively, in the range from 97.50 Hz to 135.00 Hz, in the range from 175.00 Hz to 212.50 Hz, in the range from 252.50 Hz to 290.00 Hz,. To 987.50 Hz.

The second pulsation pressure peak value in a frequency range other than the predetermined frequency range including the pulsation frequency of the higher-order component is, for example, the order 2 in the graphs of FIGS.
The next component, the third-order component, the fourth-order component,..., The thirteenth-order component, respectively, have a pulsation frequency (second peak frequency) of -67.50 dB at 127 Hz and a pulsation frequency (second peak frequency) of 180. -7 at 00Hz
8.00 dB, pulsation frequency (second peak frequency) 29
-83.75 dB at 2.50 Hz, ..., -9 at pulsation frequency (second peak frequency) 972.50 Hz
2.75 dB (see Table 1 below).

The peak difference calculating means 24 includes a first pulsating pressure peak value detected by the first peak value detecting means 22 and a second pulsating pressure detected by the second peak value detecting means 23 for each higher order. The difference from the peak value is calculated.

Here, the peak difference is, for example, as shown in FIGS.
In the case of the graph of, the second order component, the third order component, the fourth order
The next component,...
75 Hz, -5.75 Hz, 1.00 Hz, ..., -1.
00 Hz (see Table 1 below).

The peak difference total value calculating means 25 calculates the total value of the positive peak differences among the peak differences calculated by the peak difference calculating means 24.

Here, the reason why the total value of the positive peak differences among the peak differences is calculated is that the waveform of the pulsation pressure with respect to the pulsation frequency is usually from a lower pulsation frequency to a higher pulsation frequency. Pulsation frequency (from 0 Hz to 1 kHz
), The peak difference becomes a negative value, but when a pulsation occurs, only the positive values are picked up and summed to show the opposite tendency.

The reason why the peak difference of the first-order component is not used as an element of the total peak difference value is that the first-order component has a height irrespective of the pulsation of the higher-order frequency.

The peak difference total value is, for example, 70.00 dB in the case of the graphs of FIGS. 3 and 4 (see Table 1 below).

The pass / fail judgment means 26 compares the peak difference total value calculated by the peak difference total value calculation means 25 with a predetermined reference value, for example, 60.00 dB, and determines whether the peak difference total value is larger than the reference value. , The electric fuel pump 1
Is determined to be defective.

Here, in the case of the graphs of FIGS. 3 and 4, the peak difference total value is 70.00 dB, and the reference value is 60.0 dB.
Since it is larger than 0 dB, the electric fuel pump 1 is determined to be defective.

Table 1 below shows the measurement results corresponding to the graphs of FIGS.

[0028]

[Table 1]

FIGS. 5A, 5B, 5C, and 5D show
The pulsation frequency in the case where the electric fuel pump is good, the case where there is no impeller blade chipping but there is no noise, the case where the impeller blades are missing, the case where there are three impeller blades and the case where the impeller blades are missing 3 shows a graph of pulsating pressure with respect to. From these graphs, the peak difference total value is 19.5 dB in the case of FIG.
63.75 dB in the case of (B), 20 in the case of FIG.
5.75 dB and 137.5 dB in the case of FIG. 5 (D), it was possible to accurately determine a non-defective product and a defective product (claim product and impeller blade missing product).

[0030]

According to the present invention, the quality of the electric fuel pump can be accurately determined.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an inspection apparatus according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of a determination device in the inspection device.

FIG. 3 is an explanatory diagram for explaining processing contents of the determination device.

FIG. 4 is an explanatory diagram for explaining processing contents of the determination device.

FIG. 5 is an explanatory diagram of a determination result by the determination device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electric fuel pump 7 pressure sensor 10 FFT analyzer (analyzer) 11 personal computer (judgment device) 21 primary component pulsation frequency setting means 22 first peak value detection means 23 second peak value detection means 24 peak difference calculation means 25 peak difference Total value calculating means 26 Pass / fail judgment means

Claims (1)

[Claims] A pressure sensor for detecting a discharge pulsation pressure of the electric fuel pump; an analyzer for obtaining a pulsation pressure with respect to a pulsation frequency based on a discharge pulsation pressure signal from the pressure sensor; A determination device for determining the quality of the electric fuel pump based on the pulsating pressure; and a noise inspection device based on the discharge pulsation of the electric fuel pump, wherein the determination device has a primary order based on a pulsation pressure with respect to a pulsation frequency obtained by the analyzer. A first-order component pulsation frequency setting means for setting a pulsation frequency of the component; and a pulsation frequency of the first-order component set by the first-order pulsation frequency setting means. First peak value detecting means for detecting a pulsating pressure peak value in a predetermined frequency range including the pulsating frequency of the component; On the basis of the pulsation frequency of the first-order component set by the first-order component pulsation frequency setting means, the pulsation pressure in a frequency range other than the predetermined frequency range including the pulsation frequency of the higher-order component for each higher order. A second peak value detecting means for detecting a peak value, and a pulsating pressure peak value detected by the first peak value detecting means and a pulsating pressure peak detected by the second peak value detecting means for each higher order. A peak difference calculating means for calculating a difference from the peak value; a peak difference total value calculating means for calculating a sum of positive peak differences among the peak differences calculated by the peak difference calculating means; The peak difference total value calculated by the difference total value calculation means is compared in magnitude with a predetermined reference value. If the peak difference total value is larger than the reference value, the electric fuel pump is determined to be defective. That quality determination unit and the inspection unit of the noise due to discharge pulsation of the electric fuel pump, characterized in that it comprises a.