CN114592963A - Piston cooling system monitoring method and device and engine - Google Patents
Piston cooling system monitoring method and device and engine Download PDFInfo
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- CN114592963A CN114592963A CN202210266240.0A CN202210266240A CN114592963A CN 114592963 A CN114592963 A CN 114592963A CN 202210266240 A CN202210266240 A CN 202210266240A CN 114592963 A CN114592963 A CN 114592963A
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- valve core
- engine
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- 238000001816 cooling Methods 0.000 title claims abstract description 153
- 238000012544 monitoring process Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 55
- 230000002159 abnormal effect Effects 0.000 claims abstract description 16
- 238000012512 characterization method Methods 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 44
- 230000001050 lubricating effect Effects 0.000 claims description 39
- 238000007789 sealing Methods 0.000 claims description 14
- 238000012806 monitoring device Methods 0.000 claims description 12
- 238000005461 lubrication Methods 0.000 claims description 10
- 239000010724 circulating oil Substances 0.000 claims description 7
- 230000011664 signaling Effects 0.000 claims 1
- 230000005856 abnormality Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/08—Cooling of piston exterior only, e.g. by jets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention belongs to the technical field of engines and discloses a piston cooling system monitoring method and device and an engine. And looking up a table according to the power characterization value and the engine rotating speed to obtain a theoretical displacement interval of the valve core of the cooling slide valve, and judging a monitoring result. The monitoring result judgment includes judging that the state of the valve core of the cooling slide valve is abnormal if the actual displacement of the valve core of the cooling slide valve is not in the theoretical displacement interval. The theoretical displacement intervals of the cooling slide valve cores corresponding to the power representation values and the engine rotating speed are obtained through table lookup, and the actual displacement of each cooling slide valve core is compared with the theoretical displacement intervals, so that the cooling slide valve cores are monitored in real time, and the safe operation of the piston is guaranteed.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a piston cooling system monitoring method and device and an engine.
Background
The piston is one of key parts on an engine, has severe working conditions, and is subjected to high mechanical load and thermal load, wherein the high thermal load is one of main reasons causing the piston to fail. The method widely adopted at present for reducing the heat load of the piston is to carry out oil injection cooling on the piston, namely, a cooling nozzle is adopted to directly spray cooling engine oil to an oscillation oil cavity on the bottom surface of the piston, so that the heat of the piston is taken away. In order to improve the lubricating pressure of a friction pair and the heat engine efficiency of the whole engine under the low-speed working condition, a cooling nozzle assembly with a pressure control cooling slide valve is adopted in part of diesel engines, and a main oil gallery of a lubricating system in the engine and the cooling nozzle assembly jointly form a piston cooling system. The most common failure mode of the piston cooling system is that fine hard particles enter the cooling nozzle assembly to cause the clamping stagnation of the valve core of the cooling slide valve, so that the established cooling function cannot be realized, and whether the cooling nozzle assembly for performing oil injection cooling can normally work or not directly influences the cooling effect of the piston.
Disclosure of Invention
The invention aims to provide a piston cooling system monitoring method, a piston cooling system monitoring device and an engine, which are used for realizing real-time monitoring of a cooling slide valve core and ensuring safe operation of a piston.
In order to achieve the purpose, the invention adopts the following technical scheme:
a piston cooling system monitoring method, comprising:
monitoring a power representation value capable of reflecting the power of the engine, the rotating speed of the engine and the actual displacement of each cooling slide valve core;
looking up a table according to the power representation value and the engine rotating speed to obtain a theoretical displacement interval of the valve core of the cooling slide valve, and judging a monitoring result;
and the monitoring result judgment comprises the step of judging that the state of the valve core of the cooling slide valve is abnormal if the actual displacement of the valve core of the cooling slide valve is not in the theoretical displacement interval.
Preferably, the piston cooling system monitoring method further comprises monitoring a lubricating system main oil gallery pressure;
before the monitoring result is judged, looking up a table according to the rotating speed of the engine and the power representation value to obtain a theoretical pressure interval of a main oil gallery of the lubricating system;
and the monitoring result judgment further comprises the step of judging that the state of the valve core of the cooling slide valve is abnormal if the actual displacement of the valve core of the cooling slide valve is not in the theoretical displacement interval and the pressure of the main oil gallery of the lubricating system is in the theoretical pressure interval of the main oil gallery of the lubricating system.
Preferably, the determining of the state abnormality of the spool of the cooling slide valve further includes sending a spool failure signal of the cooling slide valve.
Preferably, if the pressure of the main oil gallery of the lubricating system is not in the theoretical pressure interval of the main oil gallery of the lubricating system, the lubricating system is judged to be abnormal.
Preferably, the judging of the lubrication system abnormality further comprises sending an abnormality signal of the lubrication system.
Preferably, the power characterizing value is a circulating fuel supply of the engine.
A piston cooling system monitoring device monitors a piston cooling system by using the piston cooling system monitoring method, and comprises the following steps:
the displacement sensor is arranged on the valve core of the cooling slide valve and used for monitoring the actual displacement of the valve core of the cooling slide valve;
a power characterizing sensor for monitoring a power characterizing value that is indicative of engine power;
and the control module can receive the monitoring data of the displacement sensor and the power characterization sensor and judge the monitoring result.
Preferably, the piston cooling system monitoring device further comprises a pressure sensor, the pressure sensor is arranged on the lubricating system main oil gallery and used for monitoring the pressure of the lubricating system main oil gallery, and the control module can receive monitoring data of the pressure sensor.
Preferably, the piston cooling system monitoring device further comprises a first sealing washer, the first sealing washer is clamped between the pressure sensor and the lubricating system main oil gallery, and the first sealing washer can seal a gap between the pressure sensor and the lubricating system main oil gallery.
An engine monitors the piston cooling system by using the piston cooling system monitoring method.
The invention has the beneficial effects that:
the invention discloses a method and a device for monitoring a piston cooling system and an engine, wherein a power representation value and a theoretical displacement interval of a cooling slide valve core corresponding to the engine rotating speed are obtained by looking up a table, the actual displacement of each cooling slide valve core is compared with the theoretical displacement interval, and if the actual displacement of the cooling slide valve core is not in the theoretical displacement interval, the cooling slide valve core is judged to have a fault, so that the real-time monitoring of the cooling slide valve core is realized, whether the state of the cooling slide valve core meets the cooling requirement of the piston under the current working condition is accurately judged, and the safe operation of the piston is ensured.
Drawings
FIG. 1 is a flow chart of a method for monitoring a piston cooling system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a part of a piston cooling system monitoring device according to an embodiment of the present invention after installation;
FIG. 3 is a flow chart of a method for monitoring a piston cooling system according to a second embodiment of the present invention;
fig. 4 is a partial structural schematic diagram of the piston cooling system monitoring device according to the second embodiment of the present invention after installation.
In the figure:
100. cooling the nozzle assembly; 101. cooling the spool of the slide valve; 102. cooling the slide valve body; 103. a nozzle; 104. plugging by screwing; 105. a second sealing gasket; 200. a lubrication system main oil gallery;
1. a displacement sensor; 2. a pressure sensor; 3. a first sealing gasket.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, the present embodiment provides a method for monitoring a piston cooling system, which is used for monitoring the piston cooling system, the piston cooling system includes a lubricating system main oil gallery 200 in an engine and a cooling nozzle assembly 100 disposed on the lubricating system main oil gallery 200, the structure of the cooling nozzle assembly 100 is as shown in fig. 2, and includes a cooling slide valve core 101, a cooling slide valve body 102, a nozzle 103, a plug 104, and a second sealing washer 105, the cooling slide valve body 102 is disposed on the lubricating system main oil gallery 200, the cooling slide valve core 101 is disposed on the cooling slide valve body 102, the nozzle 103 is disposed on the cooling slide valve body 102, a spring is disposed between the cooling slide valve core 101 and the cooling slide valve body 102, the cooling slide valve core 101, the cooling slide valve body 102, and the spring cooperate to regulate the flow rate of cooling oil sprayed to a piston through the nozzle 103, the plug 104 is used for plugging a process hole on the cooling slide valve body 102, a second sealing gasket 105 is used to seal the gap between the plug 104 and the cooling slide valve body 102. The piston cooling system monitoring method includes monitoring a power representative value that can represent engine power, engine speed, and actual displacement of each cooling slide valve spool 101. And (4) obtaining the theoretical displacement interval of the valve core 101 of the cooling slide valve according to the power representation value and the engine rotating speed table lookup, and judging the monitoring result. The monitoring result judgment includes judging that there is an abnormality in the state of the cooling spool valve 101 if there is an actual displacement amount of the cooling spool valve 101 that is not within the theoretical displacement amount section.
According to the monitoring method of the piston cooling system, theoretical displacement intervals of the cooling slide valve core 101 corresponding to the power representation value and the engine speed are obtained through table lookup, the actual displacement of each cooling slide valve core 101 is compared with the theoretical displacement intervals, and if the actual displacement of the cooling slide valve core 101 is not within the theoretical displacement intervals, the condition of the cooling slide valve core 101 is judged to be abnormal, so that the cooling slide valve core 101 is monitored in real time, whether the condition of the cooling slide valve core 101 meets the cooling requirement of the piston under the current working condition is accurately judged, and the safe operation of the piston is ensured.
Optionally, as shown in fig. 1, after the state of the cooling slide valve spool 101 is determined to be abnormal, a fault signal of the cooling slide valve spool 101 is sent out, so as to prompt a vehicle owner to perform a shutdown check, and repair or replace the cooling slide valve spool 101.
Preferably, the power representation value is the circulating oil supply quantity of the engine, and the circulating oil supply quantity can effectively represent the power of the engine. In other embodiments, the power indicator may also be an accelerator opening or other parameter that can indicate engine power.
The embodiment also provides a piston cooling system monitoring device, as shown in fig. 2, which comprises a displacement sensor 1, a power characterization sensor and a control module. The displacement sensor 1 is provided on the cooling spool valve 101 for monitoring the actual displacement amount of the cooling spool valve 101. A power characterizing sensor is used to monitor a power characterizing value that is indicative of engine power. The control module can receive the monitoring data of the displacement sensor 1 and the power representation sensor and judge the monitoring result. The power characteristic value and the corresponding relation between the engine speed and the theoretical displacement interval of the cooling slide valve spool 101 are obtained through experiments and stored in the control module in advance. The piston cooling system monitoring device provided by the embodiment monitors the piston cooling system by using the piston cooling system monitoring method, thereby realizing real-time monitoring of the cooling slide valve core 101, accurately judging whether the state of the cooling slide valve core 101 meets the cooling requirement of the piston under the current working condition, and ensuring the safe operation of the piston.
Specifically, in the present embodiment, the power characterizing sensor is a flow sensor disposed on an oil supply line of the engine for monitoring a circulating oil supply of the engine.
The embodiment also provides an engine, and the piston cooling system is monitored by using the piston cooling system monitoring method.
Example two
As shown in fig. 3, the present embodiment provides a piston cooling system monitoring method, which is further optimized on the basis of the first embodiment, and the piston cooling system monitoring method further includes monitoring the pressure of the main oil gallery 200 of the lubrication system. Before the monitoring result is judged, the theoretical pressure interval of the lubricating system main oil gallery 200 is obtained by looking up a table according to the rotating speed of the engine and the power representation value. The monitoring result judgment further comprises the step of judging that the state of the cooling slide valve core 101 is abnormal if the actual displacement of the cooling slide valve core 101 is not within the theoretical displacement range and the pressure of the lubricating system main oil gallery 200 is within the theoretical pressure range of the lubricating system main oil gallery 200. Therefore, the interference of the pressure of the lubricating system main oil gallery 200 on the state judgment of the cooling slide valve core 101 is eliminated, and the reason that the actual displacement of the cooling slide valve core 101 is not in the theoretical displacement interval is determined to be the abnormal state of the cooling slide valve core 101.
Optionally, after the state of the cooling slide valve core 101 is judged to be abnormal, a fault signal of the cooling slide valve core 101 is sent out, so that a vehicle owner is reminded to perform shutdown inspection, and the cooling slide valve core 101 is repaired or replaced.
Alternatively, if the lubrication system main oil gallery 200 pressure is not within the lubrication system main oil gallery 200 theoretical pressure interval, it is determined that the lubrication system is abnormal.
Optionally, the judging of the abnormality of the lubricating system further includes sending an abnormal signal of the lubricating system, so as to remind a vehicle owner to stop the machine for inspection and to overhaul the lubricating system.
Preferably, the power representation value is the circulating oil supply quantity of the engine, and the circulating oil supply quantity can effectively represent the power of the engine. In other embodiments, the power indicator may also be an accelerator opening or other parameter that can indicate engine power.
As shown in fig. 4, the present embodiment further provides a piston cooling system monitoring device, which includes a displacement sensor 1, a power characterization sensor, a pressure sensor 2 and a control module. The displacement sensor 1 is provided on the cooling spool valve 101 for monitoring the actual displacement amount of the cooling spool valve 101. A power characterizing sensor is used to monitor a power characterizing value that is indicative of engine power. The pressure sensor 2 is disposed on the lubricating system main oil gallery 200, and is used for monitoring the oil pressure in the lubricating system main oil gallery 200. The control module can receive monitoring data of the displacement sensor 1, the power characterization sensor and the pressure sensor 2 and judge monitoring results. The corresponding relation between the power representation value and the engine speed and the theoretical displacement interval of the cooling slide valve core 101 and the corresponding relation between the engine speed and the power representation value and the theoretical pressure interval of the lubricating system main oil gallery 200 are obtained through experiments and stored in the control module in advance. The piston cooling system monitoring device provided by the embodiment uses the above-mentioned piston cooling system monitoring method to monitor the piston cooling system, thereby eliminating the interference of the pressure of the main oil gallery 200 of the lubricating system on the state judgment of the valve core 101 of the cooling slide valve, and further determining that the reason that the actual displacement of the valve core 101 of the cooling slide valve is not within the theoretical displacement interval is the abnormal state of the valve core 101 of the cooling slide valve.
Specifically, in the present embodiment, the power characterizing sensor is a flow sensor disposed on an oil supply line of the engine for monitoring a circulating oil supply of the engine.
Optionally, as shown in fig. 4, the piston cooling system monitoring apparatus further includes a first sealing gasket 3, the first sealing gasket 3 is sandwiched between the pressure sensor 2 and the lubricating system main oil gallery 200, and the first sealing gasket 3 is capable of sealing a gap between the pressure sensor 2 and the lubricating system main oil gallery 200.
The embodiment also provides an engine, and the piston cooling system is monitored by using the piston cooling system monitoring method.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A piston cooling system monitoring method, comprising:
monitoring a power representation value capable of representing engine power, engine speed and actual displacement of each cooling slide valve spool (101);
obtaining a theoretical displacement interval of the valve core (101) of the cooling slide valve according to the power characterization value and the engine rotating speed table, and judging a monitoring result;
the monitoring result judgment comprises the step of judging that the state of the cooling slide valve core (101) is abnormal if the actual displacement of the cooling slide valve core (101) is not in the theoretical displacement range.
2. The piston cooling system monitoring method of claim 1, further comprising monitoring a lubrication system main gallery (200) pressure;
before the monitoring result is judged, the method also comprises the steps of looking up a table according to the rotating speed of the engine and the power representation value to obtain a theoretical pressure interval of the main oil gallery (200) of the lubricating system;
and the monitoring result judgment further comprises the step of judging that the state of the cooling slide valve core (101) is abnormal if the actual displacement of the cooling slide valve core (101) is not in the theoretical displacement interval and the pressure of the lubricating system main oil gallery (200) is in the theoretical pressure interval of the lubricating system main oil gallery (200).
3. The piston cooling system monitoring method according to any one of claims 1-2, wherein the step of sending a cooling slide valve core (101) fault signal after determining that the cooling slide valve core (101) state is abnormal.
4. The piston cooling system monitoring method according to claim 2, characterized in that if the lubricating system main oil gallery (200) pressure is not within the lubricating system main oil gallery (200) theoretical pressure interval, it is judged that the lubricating system is abnormal.
5. The piston cooling system monitoring method of claim 4 further comprising signaling a lubrication system anomaly after determining the lubrication system anomaly.
6. The piston cooling system monitoring method of claim 1 wherein said power characterizing value is a circulating oil supply of the engine.
7. A piston cooling system monitoring apparatus for monitoring a piston cooling system using the piston cooling system monitoring method according to any one of claims 1 to 6, comprising:
a displacement sensor (1) arranged on a cooling slide valve core (101) and used for monitoring the actual displacement of the cooling slide valve core (101);
a power characterizing sensor for monitoring a power characterizing value that is indicative of engine power;
and the control module can receive the monitoring data of the displacement sensor (1) and the power characterization sensor and judge the monitoring result.
8. The piston cooling system monitoring device according to claim 7, further comprising a pressure sensor (2), wherein the pressure sensor (2) is arranged on the lubricating system main oil gallery (200) and used for monitoring the pressure of the lubricating system main oil gallery (200), and the control module can receive monitoring data of the pressure sensor (2).
9. The piston cooling system monitoring device according to claim 8, characterized by further comprising a first sealing gasket (3), wherein the first sealing gasket (3) is clamped between the pressure sensor (2) and the lubricating system main oil gallery (200), and the first sealing gasket (3) can seal a gap between the pressure sensor (2) and the lubricating system main oil gallery (200).
10. An engine characterized in that the piston cooling system is monitored using the piston cooling system monitoring method as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210266240.0A CN114592963B (en) | 2022-03-17 | 2022-03-17 | Piston cooling system monitoring method and device and engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210266240.0A CN114592963B (en) | 2022-03-17 | 2022-03-17 | Piston cooling system monitoring method and device and engine |
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| CN114592963A true CN114592963A (en) | 2022-06-07 |
| CN114592963B CN114592963B (en) | 2023-05-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111043A (en) * | 2022-07-28 | 2022-09-27 | 中车大连机车车辆有限公司 | Device and method for measuring flow of cooling engine oil entering piston top of diesel engine |
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