JPH1193754A - Exhaust gas temperature display device, abnormality detecting device and abnormality detecting method of engine with supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely, quickly and efficiently detect a blow-off of a valve, an abnormality of a supercharger or injection quantity, and the like by detecting the exhaust air temperature of an engine, converting it to the exhaust air temperature in a rated output point, and comparing the converted exhaust air temperature with a threshold. SOLUTION: The rotating speed of an engine 1, the rack position of a fuel injection device 10, and the boost pressure of an intake pipe are measured by sensors 31, 32, 36, respectively, and the fuel injection quantity is calculated from the engine rotating speed and the rack position in a control part 45. It is comparatively judged whether the boost pressure is not less than a prescribed threshold or not. When the boost pressure is within the prescribed threshold, the exhaust gas temperature is measured, and the exhaust gas temperature is corrected so as to be the exhaust gas temperature at the rotating speed and fuel injection quantity in a rated output point. The corrected exhaust gas temperature is corrected so as to be the exhaust gas temperature in the rated output point, and the exhaust gas temperature after correction is compared with a threshold to judge the abnormality of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, an abnormality detection device and an abnormality detection method for an exhaust gas temperature of a supercharged engine. An exhaust temperature display device for a supercharged engine that detects the temperature and converts it to an exhaust temperature near the rated output point to determine and detect blow-by of a valve, abnormal turbocharger or injection quantity, etc. The present invention relates to an abnormality detection device and an abnormality detection method.

[0002]

2. Description of the Related Art Conventionally, a diesel engine is provided with a turbocharger, a mechanical supercharger, or the like to increase the supply of intake air and increase the output. It is also known that a pneumatic governor is used to control the supply amount of fuel supplied to a diesel engine using the supply pressure of the intake air amount to prevent the engine from stopping or to control the maximum rotation speed. I have. It is also known to measure the exhaust temperature of a diesel engine, compare the measured exhaust temperature with a threshold value, and detect the presence or absence of the following engine abnormality. Abnormal opening and closing of the valve where exhaust gas during the exhaust stroke flows from the intake valve to the suction side. Turbocharger failure due to high exhaust gas temperature. Failure of the injection device where the injection volume increases and the exhaust gas temperature rises.

[0003]

However, simply measuring the exhaust gas temperature of the diesel engine and comparing the measured exhaust gas temperature with the threshold value will not make a mistake when the exhaust gas temperature is clearly higher than the threshold value. When the exhaust gas temperature is close to the threshold value and is lower than the threshold value, it is determined that there is no abnormality even if there is an abnormality, and the determination is erroneously made, and the damage to the diesel engine is increased. At this time, if the threshold value is set to a lower value for the safe side, there is a problem that it is determined that there is an abnormality even if there is no abnormality, the determination is erroneous, unnecessary inspection is performed, and the man-hour is wasted. In addition, when the exhaust gas temperature is measured at no load or at a low rotational speed with few failures, and the value is corrected and compared with a threshold value, a large-capacity computer is required, resulting in an increase in cost. Control cannot be performed, and the control speed is delayed.

The present invention has been made in view of the above problems, and relates to an exhaust temperature display device, an abnormality detection device, and an abnormality detection method of a supercharged engine, and more particularly, to the detection of the engine exhaust temperature. At the same time, it is converted to the exhaust temperature at the time of the rated output point, the exhaust temperature of the engine is displayed over time, and the converted exhaust temperature is compared with a threshold value to determine and improve the detection accuracy, so that the valve blow-through, It is an object of the present invention to provide a display device, an abnormality detection device, and an abnormality detection method of an exhaust gas temperature of a supercharged engine that reliably, quickly, and efficiently detect an abnormality of a supercharger or an injection amount.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention of a display device for an exhaust temperature of a supercharged engine according to the present invention measures the exhaust temperature of a supercharged engine. A boost pressure sensor for measuring the boost pressure of the engine, an exhaust gas temperature sensor for detecting the exhaust gas temperature of the engine, and a storage device for displaying the exhaust temperature of the supercharged engine for storing and displaying the exhaust temperature of the engine. An engine rotation speed sensor for detecting the engine rotation speed, a fuel injection amount sensor for measuring the fuel injection amount, and a boost pressure threshold value for determining the rotation speed at the rated output point of the engine and the vicinity of the fuel injection amount. The boost pressure storage means to be stored is compared with whether the boost pressure is equal to or higher than a threshold value, and when the boost pressure is equal to or higher than a predetermined threshold value. Corrected exhaust gas temperature storage means for correcting the measured exhaust gas temperature at that time to the rotational speed of the rated output point and the exhaust gas temperature at the time of the fuel injection amount, and storing the corrected exhaust gas temperature and the operating time at that time; And a rated point exhaust temperature display means for displaying the corrected exhaust gas temperature as a change with time of the rated point exhaust temperature. With the configuration described above, a predetermined threshold value including a boost pressure line near the rated output point of the output torque of the engine is stored, and the boost pressure during operation of the engine is measured, and the measured boost pressure value is higher than the predetermined threshold value. When it is larger, the measured exhaust gas temperature is corrected to the rotational speed at the rated output point and the exhaust gas temperature at the time of fuel injection. The corrected exhaust gas temperature is stored, and the stored corrected exhaust gas temperature is displayed over time as the exhaust gas temperature. Therefore, after measuring the exhaust temperature of the diesel engine, it is constantly corrected and stored in the converted exhaust temperature under constant conditions, and
Since the corrected exhaust gas temperature is displayed over time as the exhaust gas temperature, accurate and stable comparison can be performed over time, so that the condition such as a decrease in engine performance can be accurately grasped.

In the invention of the apparatus for detecting an abnormality of the exhaust temperature of a supercharged engine according to the present invention, the exhaust temperature of the supercharged engine is measured to determine the abnormality of the engine fuel system or the intake and exhaust systems. In a device for detecting an abnormal temperature of an exhaust gas of a supercharged engine, a boost pressure sensor for measuring a boost pressure of the engine, an exhaust gas temperature sensor for detecting an exhaust gas temperature of the engine, and an engine speed for detecting an engine speed. A speed sensor, a fuel injection amount sensor for measuring a fuel injection amount, and a boost pressure storage means for storing a boost pressure threshold value for determining a rotation speed of a rated output point of the engine and a vicinity of the fuel injection amount,
The boost pressure is equal to or higher than a threshold value, and whether or not the boost pressure is equal to or higher than a predetermined threshold value is compared with the exhaust gas temperature measured at that time. It is characterized by comprising exhaust gas temperature comparing means for correcting the temperature to a threshold value and comparing it with a threshold value, and abnormality detecting means for detecting abnormality in the intake and exhaust systems when the corrected exhaust gas temperature is higher than the threshold value. With the configuration described above, similarly to the above invention, a predetermined threshold value consisting of a boost pressure line near the rated output point of the output torque of the engine is stored, and the boost pressure during operation of the engine is measured, and the measured boost pressure is measured. When the value is larger than the predetermined threshold value, the measured exhaust gas temperature is corrected to the rotational speed at the rated output point and the exhaust gas temperature at the time of fuel injection. When the corrected exhaust gas temperature is higher than a threshold, an abnormality in the intake and exhaust systems is detected. Therefore, after measuring the exhaust temperature of the diesel engine, the threshold value is constantly compared with the converted exhaust temperature under constant conditions, so that a stable comparison can be made, and the threshold value can be set to a value close to that at the time of occurrence of an abnormality. As a result, the accuracy of the abnormality detection of the diesel engine is improved, so that an erroneous determination does not increase the damage of the diesel engine, or eliminate unnecessary inspections and wasted man-hours. In addition, at no load or low rotational speed where there are few failures, the rotational speed, fuel injection amount, and exhaust temperature are not determined, so that the load on the computer is reduced, and the computer can be used more efficiently. It can also be used for control.

In another aspect of the present invention, there is provided a device for detecting an abnormality in the exhaust gas temperature of an engine with a supercharger, which measures the exhaust temperature of the engine with a supercharger to measure the fuel system of the engine or the intake and exhaust systems. In an abnormality detection device for an exhaust temperature of a supercharged engine for detecting an abnormality such as an air pressure, an atmospheric pressure sensor for detecting an atmospheric pressure, an atmospheric temperature sensor for detecting an atmospheric temperature, and an exhaust gas temperature of an engine are detected. An exhaust gas temperature sensor, an engine speed sensor for detecting the engine speed, an injection amount sensor for measuring the fuel injection amount, a boost pressure sensor for measuring the boost pressure of the engine, an atmospheric temperature of 25 ° C. and an atmospheric pressure of 760 mmH
At time g, a boost pressure storage means for storing a boost pressure threshold value for determining the rotation speed of the rated output point of the engine and the vicinity of the fuel injection amount, and comparing the boost pressure is equal to or greater than the threshold value, and Only when the boost pressure is equal to or higher than a predetermined threshold, the measured exhaust gas temperature at that time is the atmospheric temperature 25 ° C., the atmospheric pressure 760 mmHg, the rotation speed at the rated output point, and the exhaust gas temperature at the time of the fuel injection amount at the rated output point. And a detecting means for detecting an abnormality in the intake and exhaust systems when the corrected exhaust gas temperature is higher than the threshold value. With the configuration described above, a predetermined threshold value including a boost pressure line near the rated output point of the output torque of the engine at an atmospheric temperature of 25 ° C. and an atmospheric pressure of 760 mmHg is stored, and the boost pressure during operation of the engine is measured.
When the measured boost pressure value is larger than the predetermined threshold, the measured exhaust gas temperature at that time is changed to the atmospheric temperature 25.
° C, atmospheric pressure 760 mmHg, rotation speed at rated output point,
And the exhaust gas temperature at the time of fuel injection at the rated output point. When the corrected exhaust gas temperature is higher than a threshold, an abnormality in the intake and exhaust systems is detected. Therefore, in addition to the above, since the temperature of the exhaust gas further changes according to the atmospheric pressure and the atmospheric temperature, the exhaust gas temperature is converted in accordance with a predetermined atmospheric condition, and the converted exhaust gas conversion temperature is set to a predetermined predetermined value. Since the presence / absence of an abnormality is determined by comparing with the threshold value, it can be detected with higher accuracy. Further, similarly to the first embodiment, since the accuracy of the abnormality detection of the diesel engine is further improved, the judgment is erroneously made, and the damage of the diesel engine is increased, or the unnecessary inspection is performed and the man-hour is wasted. And so on. Further, similarly to the first embodiment, the load on the computer is reduced, the computer can be used efficiently, and the computer can be used for other controls.

[0008] In the invention of the method of detecting an abnormality in the exhaust temperature of a supercharged engine according to the present invention, the exhaust temperature of the supercharged engine is measured to determine the abnormality of the engine fuel system or the intake and exhaust systems. In the method for detecting an abnormality in the exhaust gas temperature of a supercharged engine, a boost pressure threshold value near the rated output point of the engine is stored and an engine boost pressure is obtained, and when the boost pressure is equal to or higher than a predetermined threshold value. Only, the measured exhaust gas temperature at that time is corrected to the rotational speed at the rated output point and the exhaust gas temperature at the time of the fuel injection amount and is compared with a threshold value.When the corrected exhaust gas temperature is larger than the threshold value, It is characterized by detecting an abnormality in the exhaust system. With the above configuration, the same operation and effect as those of the first invention of the abnormality detection device for the lubricating oil pressure of the engine can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a device and a method for detecting an abnormality in the exhaust gas temperature of a supercharged diesel engine according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of an exhaust temperature abnormality detection device 30 and a display device 46 of a supercharged diesel engine of the present invention. In FIG. 1, a supercharged diesel engine 1 (hereinafter, referred to as an engine 1) includes an engine body 2, a fuel injection device 10, a supercharger 20 such as a turbocharger, and an air cleaner 25. Is provided with an exhaust temperature abnormality detection device 30 and a display device 46. In the engine body 2, a piston 4 is slidably inserted into a cylinder provided in a crankcase 3, and the piston 4 is connected to a crankshaft 5 via a rod 6.

The fuel injection device 10 includes an injection pump 11 that receives and discharges fuel from a fuel pump (not shown), and a plunger 12 of the injection pump 11.
And a pneumatic governor 14 connected to the rack 13 to increase or decrease the amount of fuel to be supplied. The pneumatic governor 14 includes a diaphragm 15 connected to the rack 13, a spring 16 for pressing the diaphragm 15, a spring 16 for holding the diaphragm 15, and a spring 16.
And a governor case 17. The governor case 17 on the side 17a for accommodating the spring 16 is connected to a suction pipe 21 described later by a governor pipe 22. The opposite side 17b of the governor case 17 that houses the spring 16 is open to the atmosphere.

The supercharger 20, such as a turbocharger, comprises a blower 20a and a turbine 20b. The blower 20a passes through an intake valve (not shown) to an engine cylinder via an intake pipe 21, and the turbine 20b passes through an exhaust valve (not shown). It is connected to a cylinder by an exhaust pipe 23. The blower 20a of the supercharger 20 is connected to an air cleaner 25 via an air cleaner pipe 26. The turbine 20b is connected to an exhaust pipe (not shown) that discharges exhaust gas to the atmosphere.

The exhaust temperature abnormality detecting device 30 includes an engine speed sensor 31, an injection amount sensor 32, an exhaust temperature sensor 33, an atmospheric pressure sensor 34, an atmospheric temperature sensor 35, a boost pressure sensor 36, and , And a control unit 45 connected to each sensor. The engine speed sensor 31 is disposed on the crankshaft 5 and detects the speed Ne of the supercharged diesel engine 1. The injection amount sensor 32 is provided on the rack 13 and measures the position q of the rack 13 to measure the fuel injection amount Q. In the above description, the injection amount sensor 32 detects the rack 13 at the position. However, the fuel may be measured by a flow meter, a reduced amount of a tank, or an injection amount from a fuel pump. Also,
In an electronic control injection system, a command value may be used. The exhaust temperature sensor 33 is disposed in the exhaust pipe 17 between the cylinder of the engine 1 and the supercharger 15, measures the temperature Tex of the exhaust gas from the engine 1, and detects the presence or absence of abnormality of the engine by conversion described later. doing. Atmospheric pressure sensor 34
And the atmospheric temperature sensor 35 are disposed on the opposite side 27 b of the governor case 27 that houses the spring 26, and the atmospheric pressure Tt
p and the atmospheric temperature Ttm are detected. The atmospheric pressure sensor 34 and the atmospheric temperature sensor 35 may be provided on another external part of the engine 1. Boost pressure sensor 36
Is a pneumatic governor 1 connected to the suction pipe 21.
4, a boost pressure B sucked into the engine 1
p is measured.

The control unit 45 is connected to each of the above sensors, receives signals from the sensors, converts the exhaust gas temperature Tex from the exhaust temperature sensor 33 into an exhaust gas conversion temperature TPe at a rated output point, and By comparing with the threshold value TPec, the presence or absence of abnormality of the engine 1 is determined, and an alarm signal is output. In addition, the control unit 45 stores the exhaust gas converted temperature TPe, and displays the exhaust gas converted temperature TPe as the exhaust temperature at the rated output point over time,
Further, a display device 46 for displaying an abnormality when the exhaust gas conversion temperature TPe becomes equal to or higher than the threshold value TPec is connected. Further, the display device 46 is provided with a switch 47 operated when it is desired to display the stored exhaust gas temperature at the rated output point.

Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. In step 1, the rotation speed Ne of the engine 1, the position q of the rack 13,
And the boost pressure Bp is measured, and the signal is output to the control unit 45, respectively. In step 2, the control unit 4
5 calculates the fuel injection amount Q from the rotation speed Ne and the position q of the rack 13. In step 3, the control unit 45
Is a predetermined threshold value Sa in which the measured boost pressure Bp is composed of a boost pressure line near the rated output point Wp of the output torque.
It is compared whether it is above or not. At this time, the predetermined threshold value Sa is
As shown in FIG. 3, the horizontal axis represents the rotational speed Ne of the engine 1.
The position q (fuel injection amount Q) of the rack 13 is plotted on the vertical axis, and the curve of the maximum fuel injection amount line of the engine 1 and the curve of the standard boost pressure Bb sucked into the engine 1 (map indicated by a dotted line) are shown. The output torque line F (Fa point-Wp point-Fb) in the vicinity of the rated output point Wp
(A line connecting the points) and a boost pressure line V (a line connecting the points Va and VF) in the vicinity of the rated output point Wp. Is stored in If the boost pressure Bp does not fall within the predetermined threshold value Sa in step 3, the process returns to step 1.
In step 3, the boost pressure Bp is within the predetermined threshold value Sa (Y point position indicating the boost pressure Bp in FIG. 3).
Go to step 4.

In step 4, the control unit 45 receives the measurement of the exhaust gas temperature Tex by the exhaust temperature sensor 33, and uses the measured exhaust gas temperature Tex as the rotation speed Nep of the rated output point Wp and the fuel injection amount. Correction is made so as to be the exhaust gas temperature Tep at Qp. This exhaust gas temperature Tep (hereinafter referred to as corrected exhaust gas temperature Tep)
Is corrected based on a map stored in the control unit 45 and obtained by an experiment. This map is, for example, shown in FIG.
As shown in the figure, the horizontal axis represents the rotational speed Net at the time of measurement with respect to the rotational speed Nep at the rated output, and the vertical axis represents the correction coefficient ΔN. The correction for the rotational speed is obtained from the rotational speed ratio and the conversion line Ua in the figure. A coefficient ΔN is obtained, and a corrected exhaust gas temperature Tep is obtained by multiplication (corrected exhaust gas temperature Tep = ΔN × exhaust gas temperature Te). In step 5, the corrected exhaust gas temperature Tep is further determined by the output Ft of the engine 1 at the time of measurement.
The second corrected exhaust gas temperature Tepa is determined from the fuel injection amount Q at the time of and the fuel injection amount Qp at the rated output point Wp so as to be the exhaust gas temperature at the rated output point Wp.
The correction of the second correction exhaust gas temperature Tepa is performed by the control unit 4.
5 is performed based on the map obtained by the experiment stored in FIG. For example, as shown in FIG. 5, this map takes the fuel injection amount Q at the time of measurement with respect to the fuel injection amount Qp at the rated output on the horizontal axis, and the correction coefficient ΔF on the vertical axis. The correction coefficient ΔF is obtained from the conversion line Va in the middle, and the second correction exhaust gas temperature Tepa is obtained by multiplication (second correction exhaust gas temperature Tepa = ΔF × correction exhaust gas temperature Tep).

In step 6, the second corrected exhaust gas temperature Tepa is sequentially stored in the display device 46. Step 7
In, it is determined whether or not the second corrected exhaust gas temperature Tepa is smaller than a threshold value (Tepa <TEXT). If it is smaller in step 7, the process returns to step 2. If it is larger in step 7, go to step 8. Step 8
Then, it is determined that there is an abnormality in the engine 1 and a warning signal is output to the display device 46 or a warning sound. In the above, step 4 and step 5 may be interchanged, and the exhaust gas temperature is measured in step 4, but may be measured in step 1. Further, the exhaust gas temperature is measured in step 1, and when the temperature is low and safe, the calculation from step 2 onward may be omitted.

Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. In the second embodiment, the atmospheric pressure and the atmospheric temperature conditions are additionally corrected to the abnormality detection method of the first embodiment. In the flowchart, the same steps as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In step 11, the control unit 45 determines whether the measured boost pressure Bp is a boost in the vicinity of the rated output point Wp of the output torque at the standard time, that is, at the atmospheric temperature of the intake air of 25 ° C. and the atmospheric pressure of 760 mmHg. A comparison is made as to whether or not the pressure is equal to or greater than a predetermined threshold value Sa including the pressure line.
At this time, the predetermined threshold value Sa is, as shown in FIG.
The horizontal axis represents the rotation speed Ne of the engine 1 and the vertical axis represents the rack 13.
At the standard time in the drawing, that is, the maximum fuel injection amount line of the engine 1 and the standard boost pressure Bb sucked into the engine 1 at the atmospheric temperature of the intake air of 25 ° C. and the atmospheric pressure of 760 mmHg. A curve (map) is drawn, and in this map, an output torque line F near the rated output point Wp (a line connecting points Fa-Wp-Fb)
And the area surrounded by the boost pressure line V (line connecting the points Va and Vb), and the predetermined threshold value Sa is
Is stored in the storage unit 45a.

In step 12, the atmospheric pressure sensor 34 and the atmospheric temperature sensor 35 measure the atmospheric temperature Ttm and the pressure Ttp when measuring the exhaust gas of the engine. In step 13, the control unit 45 sets the atmospheric pressure T
The relationship between tp and the exhaust gas temperature Tex is represented by the atmospheric pressure Ttp
The second corrected exhaust gas temperature Tepa is further corrected in accordance with the atmospheric pressure Ttp using the map obtained by the experiment shown in FIG. As shown in FIG. 7, the horizontal axis represents the ratio between the measured atmospheric pressure Ttp and the atmospheric pressure 760 mmHg, and the vertical axis represents the pressure conversion correction coefficient ΔPa.
a, the third correction exhaust gas temperature Te is obtained by multiplication (third correction exhaust gas temperature Tepb = ΔPa × second correction exhaust gas temperature Tepa).
Find pb.

In step 14, the control unit 45 determines that the relationship between the atmospheric temperature Ttm and the exhaust gas temperature Tex is equal to the atmospheric temperature Tex.
Paying attention to the fact that the higher the tm, the higher the exhaust gas temperature Tex, the third corrected exhaust gas temperature Tepb is further corrected using the map obtained by the experiment shown in FIG. As shown in FIG. 8, the horizontal axis represents the ratio between the measured atmospheric temperature Ttm and the atmospheric temperature 25 ° C., and the vertical axis represents the temperature conversion correction coefficient ΔMa, and the temperature conversion correction is calculated from the conversion line Xa in the figure. The coefficient ΔMa is obtained and multiplied (fourth corrected exhaust gas temperature Tepc = ΔMa × third corrected exhaust gas temperature Tepb) to obtain the fourth corrected exhaust gas temperature Tepc.
Ask for. In step 15, the fourth corrected exhaust gas temperature Tepc is sequentially stored in the display device 46.

In step 16, the fourth corrected exhaust gas temperature Tepc is smaller than a threshold value (Tepc <TEXT).
Or not. If it is smaller in step 16, the process returns to step 2. If it is larger at step 16, go to step 7. In the above description, Steps 4, 5, 5, 13 and 14 may be interchanged, and the exhaust gas temperature is measured in Step 12, but may be measured in Step 1. further,
The exhaust gas temperature is measured in step 1, and when the temperature is low and safe, the calculations from step 2 onward may be omitted. In the above embodiment, the boost pressure was used.
The same effect can be obtained by detecting the boost temperature near the rated output point or the rotation speed of the turbocharger and setting the predetermined threshold value Sa.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an exhaust gas temperature abnormality detection device of a supercharged diesel engine according to the present invention.

FIG. 2 is a flowchart of a method for detecting an abnormality in the exhaust gas temperature of the supercharged diesel engine according to the first embodiment of the present invention;

FIG. 3 is a diagram illustrating a relationship between a rotation speed of an engine, a fuel injection amount, and a boost pressure sucked into the engine, and a range for correcting an exhaust gas temperature near a rated output.

FIG. 4 is a diagram illustrating the relationship between the ratio of the rotation speed of the engine at the time of measurement to the rotation speed at the time of rated output, and the correction coefficient of the exhaust gas temperature based on the rotation speed.

FIG. 5 is a diagram illustrating the relationship between the ratio of the fuel injection amount of the engine at the time of measurement and the fuel injection amount at the time of rated output, and the correction coefficient of the exhaust gas temperature based on the fuel injection amount.

FIG. 6 is a flowchart of an abnormality detection method according to a second embodiment of the exhaust gas temperature of the supercharged diesel engine of the present invention.

FIG. 7 is a diagram for explaining a relationship between a ratio between an atmospheric pressure and an atmospheric pressure of 760 mmHg at the time of measurement and a correction coefficient for converting the exhaust gas temperature into a pressure based on the atmospheric pressure.

FIG. 8 is a diagram for explaining the relationship between the ratio of the atmospheric temperature to the atmospheric temperature of 25 ° C. at the time of measurement and the correction coefficient for converting the exhaust gas temperature based on the atmospheric temperature.

[Explanation of symbols]

1. Diesel engine with supercharger, 2. Engine body,
3 ... Crankcase, 4 ... Piston, 5 ... Crankshaft 6 ... Rod, 10 ... Fuel injection device, 11 ... Injection pump, 12 ... Plunger, 13 ... Rack, 1
4 ... Pneumatic governor, 15 ... Diaphragm, 16
... Spring, 17 ... Governor case, 20 ... Supercharger, 21 ... Suction pipe, 23 ... Exhaust pipe, 25 ... Air cleaner, 30 ...
Exhaust temperature abnormality detection device, 31: engine rotation speed sensor, 32: injection amount sensor, 33: exhaust temperature sensor, 34
... atmospheric pressure sensor, 35 ... atmospheric temperature sensor, 36 ... boost pressure sensor, 45 ... control unit, 46 ... display device.

Claims (4)

[Claims] 1. A booster for measuring an engine boost pressure in an exhaust temperature display device of a supercharged engine for measuring and storing an exhaust temperature of a supercharged engine and displaying the exhaust temperature of the engine. A pressure sensor,
An exhaust gas temperature sensor for detecting the exhaust gas temperature of the engine, an engine rotational speed sensor for detecting the engine rotational speed, a fuel injection amount sensor for measuring the amount of fuel injection, a rotational speed and a fuel injection at the rated output point of the engine A boost pressure storage means for storing a boost pressure threshold value for determining the vicinity of the amount, and comparing the boost pressure with a threshold value or not, and if the boost pressure is not less than a predetermined threshold value, Corrected exhaust gas temperature storage means for correcting the measured exhaust gas temperature to the rotational speed at the rated output point and the exhaust gas temperature at the time of the fuel injection amount, and storing the corrected exhaust gas temperature and the operating time at that time; Exhaust temperature of a supercharged engine, comprising: rated point exhaust temperature display means for displaying the exhaust gas temperature as a change with time of the exhaust temperature at the rated point. Display device. 2. An abnormality detection device for an exhaust temperature of a supercharged engine for measuring an exhaust gas temperature of a supercharged engine and detecting an abnormality in an engine fuel system or an intake and exhaust system. A boost pressure sensor for measuring boost pressure, an exhaust gas temperature sensor for detecting engine exhaust gas temperature, an engine speed sensor for detecting engine speed, a fuel injection amount sensor for measuring fuel injection amount, and an engine. Boost pressure storage means for storing a boost pressure threshold for determining the rotation speed of the rated output point and the vicinity of the fuel injection amount, and comparing whether the boost pressure is equal to or greater than the threshold, and comparing the boost pressure Only when the exhaust gas temperature is equal to or higher than the predetermined threshold, the measured exhaust gas temperature at that time is compensated for the rotational speed at the rated output point and the exhaust gas temperature at the time of fuel injection. A supercharger comprising: exhaust gas temperature comparing means for correcting and comparing with a threshold value; and abnormality detecting means for detecting an abnormality in the intake and exhaust systems when the corrected exhaust gas temperature is larger than the threshold value. An abnormal temperature detection device for the exhaust temperature of an engine with an engine. 3. An abnormality detection device for an exhaust gas temperature of a supercharged engine for measuring an exhaust gas temperature of a supercharged engine and detecting an abnormality of an engine fuel system or an intake and exhaust system. Atmospheric pressure sensor for detecting pressure, atmospheric temperature sensor for detecting atmospheric temperature, exhaust gas temperature sensor for detecting engine exhaust gas temperature, engine rotational speed sensor for detecting engine rotational speed, and fuel injection amount An injection amount sensor for measuring the engine pressure, a boost pressure sensor for measuring the boost pressure of the engine, and an atmospheric temperature 2
At 5 ° C. and an atmospheric pressure of 760 mmHg, a boost pressure storage means for storing a boost pressure threshold value for determining the rotation speed of the rated output point of the engine and the vicinity of the fuel injection amount, and determining whether the boost pressure is equal to or greater than the threshold value. Compare and
Only when the boost pressure is equal to or higher than a predetermined threshold, the measured exhaust gas temperature at that time is the atmospheric temperature 25 ° C., the atmospheric pressure 760 mmHg, the rotation speed at the rated output point, and the exhaust gas temperature at the time of the fuel injection amount at the rated output point. A supercharged engine, comprising: comparing means for correcting the exhaust gas temperature and comparing it with a threshold value; and detecting means for detecting an abnormality in the intake and exhaust systems when the corrected exhaust gas temperature is higher than the threshold value. An exhaust temperature abnormality detection device. 4. A method for detecting an abnormality in an exhaust temperature of a supercharged engine, comprising measuring an exhaust temperature of the supercharged engine and detecting an abnormality in an engine fuel system or an intake and exhaust system. In addition to storing the boost pressure threshold near the rated output point, the boost pressure of the engine is obtained, and only when this boost pressure is equal to or higher than a predetermined threshold, the measured exhaust gas temperature at that time is compared with the rotational speed of the rated output point and the fuel. The exhaust gas temperature at the time of the injection amount is corrected and compared with a threshold value, and when the corrected exhaust gas temperature is larger than the threshold value, an abnormality in the intake and exhaust systems is detected. Anomaly detection method.