JPH04123342U - Combustion monitoring device for internal combustion engines - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a combustion monitoring device so that the combustion status inside a cylinder during engine operation can be easily determined from the outside of the combustion chamber. [Structure] Cylinder head vibration during engine operation. Among the signals and distortion signals of the cylinder liner around the combustion chamber, the distortion signal in the most effective timing range for determination, and both the vibration and distortion signals above are input to the combustion determination monitor, and the results are displayed on the display.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a combustion condition monitoring device for a diesel engine.

0002

[Conventional technology]

To monitor the combustion status of an internal combustion engine, it is usually necessary to monitor the combustion chamber of the engine during operation. The combustion gas pressure was extracted from the engine, and the gas pressure was analyzed in detail to make a judgment.

0003

[Problem that the idea aims to solve]

However, in the conventional method, the combustion status was determined by analyzing the combustion gas, which was time-consuming. It was time consuming and expensive. Also, the combustion gas is high temperature and pressure, so a water-cooled pressure gauge is required. It was also necessary to use some special equipment.

0004 The purpose of this invention is to solve the problems of the conventional device and to reduce the amount of combustion inside the cylinder during engine operation. To provide a monitoring device or display device that allows the combustion status to be easily determined from outside the combustion chamber. be.

[0005]

[Means to solve the problem]

The combustion monitoring device for an internal combustion engine of the present invention monitors the combustion pressure in the cylinder of an internal combustion engine. A vibration detector that detects the vibration signal of the cylinder cover and a vibration detector that detects the vibration signal of the cylinder cover of the A strain detector that detects strain signals from each cylinder liner position, and the strain detection A detection range setting device that sets the range for monitoring signals based on the signal from the device. and detects the combustion status by receiving both signals from the detection range setting device and the vibration detector. It is characterized by having a monitoring device that performs determination and a display device.

[0006]

[Effect]

Since the combustion monitoring device of the present invention is configured as described above, the combustion monitoring device of the present invention is configured as described above. At the same time, the combustion phenomenon is detected as a vibration signal of the cylinder cover. is detected as a strain signal from the cylinder liner at the same level as the combustion chamber. Vibration within the timing range necessary for judgment is determined via the judgment range setter based on the signal. Both signals are input to the combustion judgment monitor and the results are displayed on the display. indicate. The combustion status of the engine can be monitored in the manner described above.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is an overall configuration diagram of the first embodiment of the present invention, and Figure 2 is a series diagram of the combustion determination monitor. The detection position setting waveform and combustion detection setting range diagram on the cylinder liner and the cylinder head FIG. 3 shows vibration detection waveform diagrams during normal combustion and abnormal combustion. As shown in FIG. 1, in the combustion monitoring system of the present invention, the strain detector input device 6 includes: Cylinder cover vibration such as Viezo installed in the fuel injection valve mounting hole of the cylinder head, etc. The signal from the motion detector 2 is input and sent to the combustion judgment monitor 7 in a judgment-ready state. Ru. Also, the strain signal from the strain detector 3 from each cylinder position at the same level as the combustion chamber is used for strain detection. The signal is input to the output/input device 4 and sent to the combustion judgment monitor 7 via the detection range setting device 5. The determination is displayed on the display 8.

Next, the operation of the embodiment will be explained. Since it is configured as described above, vibration and strain signals from the cylinder head and cylinder liner are inputted to the vibration and strain detector input devices 6 and 4. The former signal as shown in Fig. 2 is sent directly, and the latter signal is sent to the combustion judgment monitor 7 via the detection range setting device 5. Only valid signals are sent to the combustion judgment monitor 7, and the results are displayed on the display to ensure the combustion status in real time. will be displayed. To further explain FIG. 2 in detail, (a) is a waveform diagram of distortion detected from the cylinder liner, and (b) is a diagram in which the range of the most appropriate setting timing t for determining the above-mentioned combustion situation is set. (c) The detected waveform signal from the cylinder head shows a vibration amplitude value α ₀ like waveform A during normal combustion, and a vibration amplitude value like waveform B when ignition occurs due to an abnormality in the fuel injection system or combustion system. The combustion status is quantitatively displayed by outputting the amplitude values of these vibration waves, making it possible to constantly monitor the combustion status.

[0009]

[Effect of the idea]

Since the combustion monitoring device for an internal combustion engine according to the present invention is constructed as described above, it is different from the conventional one. The combustion gas from the combustion chamber can be constantly measured in real time while the engine is running. The combustion status of all cylinders is monitored and the status is detected by the display, and the combustion efficiency of the engine is monitored. can be maintained at its highest level at all times.

[Brief explanation of drawings]

[Fig. 1] Overall configuration diagram according to the first embodiment of the present invention

[Figure 2] Detection waveform diagram in the combustion determination monitor

[Explanation of symbols]

2 Cylinder cover vibration detector 3 Cylinder liner distortion detector 4 Distortion detector input device 5 Detection range setter 6 Vibration detector input device 7 Combustion judgment monitor 8 Display.

Claims (1)

[Scope of utility model registration request] [Claim 1] A vibration detector (2) that detects combustion pressure in an internal combustion engine cylinder as a vibration signal of a cylinder cover of the engine; and a strain detection device that detects a strain signal from each cylinder liner position at the same level as the combustion chamber. a detection range setting device (5) for setting a range for monitoring the signal based on the signal from the strain detector; A combustion monitoring device for an internal combustion engine, comprising a monitoring device (7) and a display device (8) that receive both signals and determine the fuel status.