JPH05203439A - Method for detecting closed gap of piston ring - Google Patents

Abstract

PURPOSE:To surely detect the closed gap of a piston ring passing in front of a gap sensor at the time of detecting the abrasion loss of the piston ring from the closed gap width of the piston ring by using the gap sensor. CONSTITUTION:The shape signal of a piston ring 1 obtained by means of a gap sensor 2 is detected in accordance with the rotation of an engine. A comparator 8 compares the shape signal with the shape signal of the piston ring 1 obtained at the preceding time and detects that the closed gap of a piston ring 1 comes to the position of the gap sensor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring abutment detection method applied to detection of piston ring wear of an engine.

[0002]

2. Description of the Related Art Conventionally, as a piston ring abutment detection method applied to detect the piston ring wear amount of an engine, an analog value of a piston ring shape signal obtained by a gap sensor is A / D converted and digitized. The digital value is analyzed by a computer processing program to determine whether or not the abutment of the piston ring is located in front of the gap sensor.

[0003]

If the data analysis processing program of the computer is used to determine whether the abutment of the piston ring is in front of the gap sensor as described above, it takes time to perform the processing. Moreover, the data processing cannot be executed every time the abutment of the piston ring passes the front surface of the gap sensor during engine operation. Therefore, even if the abutment is located in front of the gap sensor, it is often overlooked, and as a result, the abutment width cannot be detected, and there is a high possibility that the amount of wear cannot be measured.

The present invention has been made in view of the above situation, and an object of the present invention is to prevent passage of the piston ring joint in front of the gap sensor in order to improve the accuracy of measurement of the wear amount of the piston ring. Another object of the present invention is to provide a piston ring abutment detection method capable of surely detecting the joint.

[0005]

SUMMARY OF THE INVENTION That is, the present invention provides a piston ring abutment detection method for detecting the wear amount of the piston ring from the abutment width of the piston ring by using the gap sensor. The shape signal is detected in accordance with the rotation of the engine, and this piston ring shape signal is compared with the previously obtained piston ring shape signal to detect that the abutment of the piston ring has come to the gap sensor position. With this, the piston ring abutment passing in front of the gap sensor can be reliably detected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure thereof, in which 1 is a piston ring which is an object of detection of an abutment, 2 is embedded in an inner wall of a cylinder, and the piston ring 1 reciprocates in the cylinder and passes through the immediately preceding portion. In this case, a gap sensor consisting of multiple elements that detects the shape, 3 is a gap sensor amplifier that amplifies the shape signal obtained by the gap sensor 2 with a constant amplification factor, and 4 is a shape that is amplified by the gap sensor amplifier 3. Integrator for integrating signal, 5 is integrator 4
A switch circuit for switching and connecting the integrated signal obtained in step 6, 6 is a first hold circuit 6 for sampling and holding the integrated signal of the integrator 4 sent via the switch circuit 5, and 7 is a first hold circuit 6 and Similarly, a second hold circuit for sampling and holding the integrated signal of the integrator 4 sent via the switch circuit 5, 8 is a hold output of the first hold circuit 6 and a hold output of the second hold circuit 7. Is a comparator for comparing and judging, and 9 is an integrator 4 based on an output signal from a rotary encoder 10 for detecting engine rotation.
, A switch circuit 5, a control circuit for sending the timing signals a to d to each of the first hold circuit 6 and the second hold circuit 7, and 11 for receiving the comparison judgment signal from the comparator 8 and for the gap sensor amplifier 3 Input the shape signal of analog value amplified by, digitize and output it A
A / D converter, 12 is a CPU that performs data analysis processing such as the wear amount of the piston ring 1 based on a digital value signal output from the A / D converter 11, and 13 is a data analysis result obtained by the CPU 12. It is a CRT as a display unit.

In the above-described structure, the gap sensor 2 has a plurality of elements, for example, about 3 to 4 embedded side by side in the circumferential direction of the piston ring 1, and the detection output of each element is collectively for the gap sensor. Amplified by amplifier 3 and integrated
4, output to the A / D converter 11.

In the case where the abutment portion of the piston ring 1 does not pass the position of the gap sensor 2 at all, as shown in FIG. 3 (a), the gap sensor 2 detects the passage of the piston ring 1 by all its elements and outputs a detection signal. Output to the gap sensor amplifier 3. As a result, the output of the gap sensor amplifier 3 is sent to the integrator 4 and the A / D converter 11 as a waveform as shown in FIG.

At this time, the integration time control signal a as shown in FIG. 2B is input from the control circuit 9 to the integrator 4,
Since the integral action is excited, the output of integrator 4 is
The wave height V1 as shown in (3) is input to the switch circuit 5. Since the switch circuit 5 is connected to the first hold circuit 6 side at this point, when the hold timing control signal c from the control circuit 9 shown in FIG. 2 (4) is input to the first hold circuit 6. Output signal voltage V of integrator 4
1 is sampled and held by the first hold circuit 6 side through the switch circuit 5 as shown in FIG.

Thereafter, the switch circuit control signal b shown in FIG. 2 (6) is given from the control circuit 9 to the switch circuit 5,
The switch circuit 5 is switched and connected from the first hold circuit 6 side to the second hold circuit 7 side.

Here, when the gap portion of the piston ring 1 passes the position of the gap sensor 2 as shown in FIG. 3B, at least some elements of the gap sensor 2 can detect the passage of the piston ring 1. The output of the gap sensor amplifier 3 becomes an incomplete waveform as shown in FIG. 2 (1) and is sent to the integrator 4 and the A / D converter 11.

At this time also, the integrator 4 receives the integration time control signal a as shown in FIG. 2B from the control circuit 9,
Since the integral action is excited, the output of integrator 4 is
The wave height V2 as shown in (3) is input to the switch circuit 5. Since the switch circuit 5 is connected to the second hold circuit 7 side at this time, when the hold timing control signal d from the control circuit 9 shown in FIG. 2 (7) is input to the second hold circuit 7. Output signal voltage V of integrator 4
2 is sampled and held by the second hold circuit 7 side through the switch circuit 5 as shown in FIG.

Then, the comparator 8 compares the voltage value V2 held by the second hold circuit 7 with the voltage value V1 held by the first hold circuit 6, and the second hold circuit 7 The voltage value V2 being held by is lower, so it is judged that the abutment portion of the piston ring 1 has passed the position of the gap sensor 2 and the comparator 8 outputs the comparator output as shown in Fig. 2 (9). Is sent to the A / D converter 11.

The A / D converter 11 converts the output from the gap sensor amplifier 3 into digital data corresponding to the output of the comparator and sends it to the CPU 12. The CPU 12 analyzes the digital data to output the piston ring. 1
Calculate the joint width of the
Display output at 13.

[0016]

As described above, according to the present invention, in the piston ring abutment detection method for detecting the wear amount of the piston ring from the abutment width of the piston ring using the gap sensor, the piston ring obtained by the gap sensor is used. The shape signal is detected in accordance with the rotation of the engine, and this piston ring shape signal is compared with the previously obtained piston ring shape signal to detect that the abutment of the piston ring has come to the gap sensor position. Things
A piston ring abutment detection method capable of reliably detecting the piston ring abutment passing in front of the gap sensor and improving the accuracy of measurement of the wear amount of the piston ring can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration according to an embodiment of the present invention.

FIG. 2 is a timing chart showing each signal waveform of FIG.

FIG. 3 is a diagram showing a positional relationship between a gap portion of the piston ring of FIG. 1 and a gap sensor.

[Explanation of symbols]

1 ... Piston ring, 2 ... Gap sensor, 3 ... Gap sensor amplifier, 4 ... Integrator, 5 ... Switch circuit, 6
… First hold circuit, 7… Second hold circuit, 8…
Comparator, 9 ... Control circuit, 10 ... Rotary encoder, 11 ...
A / D converter, 12 ... CPU, 13 ... CRT.

Claims (1)

[Claims] 1. A piston ring abutment detection method for detecting the wear amount of a piston ring from the abutment width of a piston ring using a gap sensor, wherein a piston ring shape signal obtained by the gap sensor is detected in accordance with rotation of an engine. Then, the piston ring shape signal is compared with a previously obtained piston ring shape signal to detect that the piston ring shape signal has reached the gap sensor position.