JPH06174580A - Leakage detector for combustion gas of internal combustion engine - Google Patents

Abstract

PURPOSE:To detect the leakage of a combustion gas earlier by installing temperature sensors and pressure sensors mounted at every cylinder, a device amplifying and converting the signals of these sensors, a device displaying the amplified converted values and an alarm device at a time when these values are higher than or lower than a set value in a cooling water system. CONSTITUTION:A feed pump 5 forwards cooling water in a cooling water tank 4 into the water chambers of each engine combustion chamber 2 through a cooling water pipe 3, and cooling water is returned to the tank 4 after cooling. A supply-like pressure sensor V, a supply-line temperature sensor 8, pressure sensors 9, 10 for No.1 and (n) combustion chambers, and temperature sensors 11, 12 for the No.1 and (n) combustion chambers detect the pressure and temperature of cooling water and the pressure and temperature of the outlets of cooling water in the periphery of the combustion chambers 2 of each number, transmit signal to a sensor input device, and emit display, alarm and engine stop signals. There is constant temperature difference in the outlet of the pump 5 and the outlets of the combustion chamber 2 at the temperature of cooling water, but the temperatures of the outlet of the combustion chambers 2 are elevated when a gas leaks into cooling water. The pressure of cooling water is approximately equalized in the outlet of the pump 5 and the outlets of the combustion chamber 2, but the pressure of the outlets of the combustion chambers in increased when cooling water leaks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion gas leak detection device for an internal combustion engine.

[0002]

2. Description of the Related Art Combustion gas leakage detection of an internal combustion engine is not usually performed. As a result, they sometimes miss serious accidents. If the location where the combustion gas leaks is outside the engine, it is possible to detect it because the leak gas from the gas seal can be visually determined. However, it is difficult to discriminate when there is a combustion gas leak from the hidden combustion chamber.

[0003]

In the detection of combustion gas leakage in an internal combustion engine, there is no conventional abnormality diagnostic device using a special sensor. Therefore, for example, the combustion gas leaks and mixes into the cooling water around the combustion chamber during operation of the engine, and this phenomenon could not be detected early and was overlooked, which could lead to a secondary major accident. In addition, when combustion gas leaks due to high temperature and high pressure, a detection technique that pays attention to this has been desired. An object of the present invention is to provide a device for early detection of combustion gas leakage as a solution to the above problems.

[0004]

SUMMARY OF THE INVENTION A combustion gas leakage detection device according to the present invention comprises a temperature sensor and a pressure sensor installed for each cylinder in a cooling water system for cooling each combustion chamber, and the temperature sensor and the pressure sensor. It has a device having a function of increasing and converting a signal, a device having a function of displaying the temperature and pressure of the cooling water, and a device having a function of issuing an alarm when the temperature and pressure are above or below a set level. It is characterized by

[0005]

[Operation] Consider a case where combustion gas leaks from the combustion chamber due to a damage accident around the combustion chamber during engine operation. The periphery of the combustion chamber is surrounded by a cooling chamber having a water channel. Any abnormality (fault) in the part between the combustion chamber and the cooling chamber
When there is a leak, the gas in the combustion chamber enters the cooling water, and the high-temperature high-pressure gas in the combustion chamber enters the cooling water, thereby changing the pressure and temperature in the water chamber. This is detected by a pressure detection sensor and a temperature detection sensor installed in the cooling water system line of each cylinder. The signals from the pressure detection sensor and the temperature detection sensor placed at the cooling water outlet of each cylinder are amplified and converted. The pressure and temperature of the cooling water are constantly monitored and displayed during engine operation. This allows the abnormality to be detected early. When the temperature and pressure are above or below the set level, an alarm is issued.

[0006]

EXAMPLES Examples will be described with reference to FIGS. FIG. 1 is a diagram of a place where a detection sensor is installed according to the embodiment, FIG. 2 is a block diagram of a measurement system according to the embodiment, and FIG. A pressure sensor and a temperature sensor for detecting combustion gas leakage are installed at the cooling water outlet of each cylinder of the engine. In order to constantly monitor the signal from the detection sensor, the detection signal is LED-displayed for each cylinder. A threshold value is provided for the value of the pressure or temperature to be monitored, and in the case of an abnormality, the alarm level value has a function of detecting an abnormality. In the figure,
1 is an engine body, 2 is an engine combustion chamber, 3 is a cooling water inlet pipe, 4
Is a cooling water tank, and 5 is a supply pump, which is a known element of an internal combustion engine. Reference numeral 7 is a supply line pressure sensor, and 8 is a supply line temperature sensor, both of which are provided in the discharge pipe of the supply pump 5. No. 9 is No. The No. 1 combustion chamber pressure sensor. It is provided at the cooling water outlet of one combustion chamber. No. 11 is No. No. 1 in the temperature detection sensor for the combustion chamber. It is provided near the pressure detection sensor 9 for one combustion chamber. Reference numeral 10 is a pressure detection sensor for the nth combustion chamber, which is provided at the cooling water outlet of the nth combustion chamber. Reference numeral 12 denotes an n-th combustion chamber temperature detection sensor, which is provided near the n-th combustion chamber pressure detection sensor 10.

Reference numeral 21 is a pressure detection sensor, and 22 is a temperature detection sensor, both of which are provided for each combustion chamber. Reference numeral 23 denotes a temperature sensor input device and a pressure sensor input device, which are pressure detection sensors 2
1 and the temperature detection sensor 22 are connected to each other.
A temperature / pressure amplification converter 24 is connected to the temperature sensor input device and the pressure sensor input device 23. Reference numeral 25 is a monitoring display device, which is connected to the temperature / pressure amplification device 24. An alarm engine stop signal 26 is connected to the monitor display device 25. T _H is alarm level 1 and T _HH is alarm level 2.
S _H is alarm level 1, S _HH is alarm level 2, and S _L is alarm level 3.

The operation of the above embodiment will be described. The supply pump 5 sucks the cooling water in the cooling water tank 4 and sends it to the water chamber around each engine combustion chamber 2 through the cooling water inlet pipe 3. The cooling water cools each engine combustion chamber 2 and is returned to the cooling water tank.
The supply line pressure sensor 7 and the supply line temperature sensor 8 detect the pressure and temperature of the cooling water at the outlet of the supply pump 5.
No. No. 1 combustion chamber pressure detection sensor 9 is No. 1 The pressure at the outlet of the cooling water around the combustion chamber is detected, the pressure detection sensor 10 for the nth combustion chamber detects the pressure at the outlet of the cooling water around the nth combustion chamber, and sends a signal to the pressure sensor input device 23, respectively. . No. No. 1 combustion chamber temperature detection sensor 11 1 The temperature of the cooling water at the outlet of the cooling water around the combustion chamber is detected, and the temperature detection sensor 12 for the n-th combustion chamber detects the temperature of the cooling water at the outlet of the cooling water around the n-th combustion chamber, and the signals thereof are used as temperature sensors. Send to the input device 23. The temperature sensor input device and the pressure sensor input device 23 convert the signal into the temperature / pressure amplification conversion device 2
4 is sent to the monitor display device 25 as an analog signal, and the monitor display device 25 displays the pressure and temperature values for each cylinder by LED as shown in FIG.

In the monitoring display, a set level is provided for each cylinder and alarm levels 1, 2 and 3 are displayed. The alarm engine stop signal device 26 receives a signal from the monitor display device 25 and generates an alarm or an engine stop signal.
The temperature of the cooling water is measured from the outlet of the supply pump 5 (detected by the supply line temperature detection sensor 8) to the combustion chamber outlet (No. 1 combustion chamber temperature detection sensor 11, nth combustion chamber temperature detection sensor 12).
Is higher than normal detection), but it is within a certain range when normal. When the combustion gas leaks into the cooling water, the temperature of the cooling water exiting the combustion chamber rises. As shown in FIG. 3, an alarm level 1 is set at the cooling water temperature T _H , and an alarm level 2 is set at T _HH . When the pressure of the cooling water is normal, the supply pump outlet (the supply line pressure detection sensor 7 detects) and the combustion chamber outlet (No. 1 combustion chamber pressure detection sensor 9 and the nth combustion chamber pressure detection sensor 10)
Is almost the same as. When the combustion gas leaks into the cooling water, the pressure of the cooling water at the outlet of the combustion chamber rises. An alarm level 1 is set at the pressure S _H in FIG. 3, and an alarm level 2 is set at the pressure S _HH . When the damage to the combustion chamber becomes large, the cooling water leaks into the combustion chamber to the contrary, the pressure of the cooling water _decreases , and the alarm level 3 is set at the pressure S _L in FIG. The alarm engine stop signal device 26 generates an alarm or an engine stop signal according to the alarm level to prevent an accident.

[0010]

By installing the internal combustion engine combustion gas leakage detection device of the present invention, an abnormality (damage such as crack) of the cylinder liner and the cylinder cover around the combustion chamber cooling portion can be detected at an early stage. Therefore, the present invention can provide an apparatus for early detecting the leakage of combustion gas of an internal combustion engine.

[Brief description of drawings]

FIG. 1 is a diagram of a location where a detection sensor according to an embodiment is installed.

FIG. 2 is a block diagram of a measurement system according to an embodiment.

FIG. 3 is a diagram of a monitor display of the embodiment.

[Explanation of symbols]

1 ... Engine body, 2 ... Engine combustion chamber, 3 ... Cooling water inlet pipe, 5
… Supply pump, 9… No. 1 Combustion chamber pressure sensor,
No. 10 ... No. n combustion chamber pressure detection sensor, 11 ... No. DESCRIPTION OF SYMBOLS 1 combustion chamber temperature detection sensor, 12 ... nth combustion chamber temperature detection sensor, 21 ... pressure detection sensor, 22 ... temperature detection sensor,
23 ... Temperature sensor input device Pressure sensor input device, 24 ...
Temperature / pressure amplification converter, 25 ... Monitoring display device, 26 ... Alarm engine stop signal device.

Claims (1)

[Claims] 1. A temperature sensor (11), (12), (2) provided for each cylinder in a cooling water system for cooling each combustion chamber.
2) and pressure sensors (9), (10) and (21), a device (24) having a function of increasing and converting the signals of the temperature sensor and the pressure sensor, and the temperature and pressure of the cooling water are displayed. A combustion gas leakage detection device for an internal combustion engine, comprising a device (25) having a function and a device (26) having a function of generating an alarm when temperature and pressure are above or below a set level.