CN114718786A - Heating device and method for common rail system of diesel engine - Google Patents
Heating device and method for common rail system of diesel engine Download PDFInfo
- Publication number
- CN114718786A CN114718786A CN202210436548.5A CN202210436548A CN114718786A CN 114718786 A CN114718786 A CN 114718786A CN 202210436548 A CN202210436548 A CN 202210436548A CN 114718786 A CN114718786 A CN 114718786A
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- common rail
- pressure
- ecu
- diesel engine
- alumina ceramic
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Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 35
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 4
- 239000002283 diesel fuel Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
-
- 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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a heating device and a method of a common rail system of a diesel engine, wherein the heating device of the common rail system of the diesel engine comprises the following components: the high-pressure common rail pipe, the PLV valve, the rail pressure temperature sensor and the heater. The PLV valve is disposed within one end of the high pressure common rail pipe. The rail pressure temperature sensor is arranged at the other end of the high-pressure common rail pipe and electrically connected with the ECU. And the heater is fixedly connected with one end of the PLV valve close to the rail pressure temperature sensor, and the heater is respectively electrically connected with the ECU and the whole vehicle storage battery. Wherein, ECU can control the heater and preheat high pressure common rail pipe. Therefore, the heating device of the common rail system of the diesel engine, disclosed by the invention, has the advantages of simple and reasonable structure, high heating efficiency, stable heating performance, capability of effectively improving the cooling starting performance of the engine, convenience in arrangement and low cost.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a heating device and a heating method for a common rail system of a diesel engine.
Background
The diesel engine is widely applied in the field of commercial vehicles, but the performance of the diesel engine is influenced by the ambient temperature and pressure, the lower the ambient temperature is, the higher the altitude is, the poorer the starting performance of the diesel engine is, and particularly in an extremely cold environment, when the ambient temperature is lower than minus 25 ℃, the problem that the diesel engine is difficult to start and emits black smoke easily occurs; the reasons are that the viscosity of diesel oil at low temperature is increased, the injection atomization effect is poor, the combustion is poor, the power-applying capability of an engine is weak, and the resistance is large, so that the temperature of the diesel oil during starting needs to be increased, and the problem of cold starting needs to be improved.
The prior technical scheme has the following defects:
the diesel oil filter cup heating is mostly adopted among the current technical scheme, or cooling water circulation heating is utilized, no matter which heating method is utilized, the influence of the fuel injector to this section of diesel oil filter pipeline is ignored: because more diesel oil is left in the low-pressure oil way, the diesel oil pump, the high-pressure common rail pipe and the high-pressure oil pipe, the diesel oil is frozen to a low temperature after the engine is stopped at an extremely cold temperature, and the diesel oil which enters the cylinder during starting is still unheated diesel oil, the calculation result of a certain 4-liter engine shows that at least 40 seconds are needed for consuming the low-temperature diesel oil of the pipeline, and the low-temperature diesel oil enters the cylinder, so that the intake temperature is further reduced at the end of compression; meanwhile, due to the fact that viscosity is high and atomization is poor, the problem that starting failure is caused by smoking in the starting process and even cylinder flooding is caused can be caused, and therefore the temperature of diesel oil close to an oil sprayer section needs to be increased.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a heating device and a heating method for a common rail system of a diesel engine, which have the advantages of simple and reasonable structure, high heating efficiency, stable heating performance, capability of effectively improving the cooling starting performance of the engine, convenience in arrangement and low cost.
In order to achieve the above object, in a first aspect, the present invention provides a heating apparatus for a common rail system of a diesel engine, comprising: the high-pressure common rail pipe, the PLV valve, the rail pressure temperature sensor and the heater. The PLV valve is disposed within one end of the high pressure common rail pipe. The rail pressure temperature sensor is arranged in the other end of the high-pressure common rail pipe and is electrically connected with the ECU. And the heater is fixedly connected with one end of the PLV valve close to the rail pressure temperature sensor, and the heater is respectively electrically connected with the ECU and the whole vehicle storage battery. Wherein, ECU can control the heater and preheat high pressure common rail pipe.
In one embodiment of the invention, the heater is a MCH alumina ceramic heater.
In one embodiment of the invention, the MCH alumina ceramic heater is respectively and electrically connected with an air inlet preheating pin of the ECU and the positive and negative electrodes of a battery jar of the whole vehicle.
In one embodiment of the invention, the rail pressure temperature sensor is used for monitoring the temperature and the pressure in the high-pressure common rail pipe in real time and sending the temperature and the pressure in the high-pressure common rail pipe to the ECU in real time.
In one embodiment of the invention, when the ambient temperature of the vehicle is lower than a first preset value, the ECU controls the MCH alumina ceramic heater to preheat the high-pressure common rail pipe.
In one embodiment of the invention, when the temperature of the MCH alumina ceramic heater for preheating the high-pressure common rail pipe exceeds a second preset value, the ECU controls the MCH alumina ceramic heater to stop heating.
In a second aspect, the present invention provides a heating method for a common rail system of a diesel engine, comprising: the rail pressure temperature sensor monitors the temperature and the pressure in the high-pressure common rail pipe in real time, and transmits the monitoring result to the ECU. When the ambient temperature of the vehicle is lower than a first preset value, the ECU controls the MCH alumina ceramic heater to preheat the high-voltage common rail pipe. When the temperature of the MCH alumina ceramic heater for preheating the high-voltage common rail pipe exceeds a second preset value, the ECU controls the MCH alumina ceramic heater to stop heating. Wherein, MCH alumina ceramic heater and PLV valve fixed connection, and PLV valve fixed setting is in the one end of high pressure common rail pipe. Wherein, rail pressure temperature sensor sets up in the other end of high pressure common rail pipe.
In one embodiment of the invention, the MCH alumina ceramic heater is respectively and electrically connected with an air inlet preheating pin of the ECU and the positive and negative electrodes of a battery jar of the whole vehicle.
Compared with the prior art, the heating device and the method for the common rail system of the diesel engine have the advantages of simple and reasonable structure, high heating efficiency, stable heating performance, capability of effectively improving the cooling starting performance of the engine, convenience in arrangement and low cost.
Drawings
Fig. 1 is a schematic structural view of a heating apparatus of a common rail system of a diesel engine according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of a heating apparatus of a common rail system of a diesel engine according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a heating method of a common rail system of a diesel engine according to an embodiment of the present invention.
Description of the main reference numerals:
1-high-pressure common rail pipe, 2-PLV valve, 3-rail pressure temperature sensor, 4-heater, 5-battery jar, 6-ECU, 7-air inlet preheating pin.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic configuration diagram of a heating apparatus of a common rail system of a diesel engine according to an embodiment of the present invention. Fig. 2 is a schematic connection diagram of a heating apparatus of a common rail system of a diesel engine according to an embodiment of the present invention.
As shown in fig. 1 to 2, in a first aspect, a heating apparatus of a common rail system of a diesel engine according to a preferred embodiment of the present invention includes: a high pressure common rail 1, a PLV valve 2, a rail pressure temperature sensor 3 and a heater 4. A PLV valve 2 is provided in one end of the high pressure common rail 1. The rail pressure temperature sensor 3 is arranged at the other end of the high-pressure common rail pipe 1, and the rail pressure temperature sensor 3 is electrically connected with the ECU 6. And the heater 4 is fixedly connected with one end of the PLV valve 2 close to the rail pressure temperature sensor 3, and the heater 4 is respectively electrically connected with the ECU6 and the storage battery 5 of the whole vehicle. Among them, the ECU6 can control the heater 4 to preheat the high-pressure common rail 1.
In one embodiment of the present invention, the heater 4 is an MCH alumina ceramic heater 4.
In one embodiment of the invention, the MCH alumina ceramic heater 4 is respectively electrically connected with an air inlet preheating pin 7 of the ECU6 and the positive and negative electrodes of the battery 5 of the whole vehicle.
In one embodiment of the present invention, the rail pressure and temperature sensor 3 is used to monitor the temperature and pressure in the high pressure common rail pipe 1 in real time and send the temperature and pressure in the high pressure common rail pipe 1 to the ECU6 in real time.
In one embodiment of the invention, the ECU6 controls the MCH ceramic alumina heater 4 to preheat the high voltage common rail 1 when the ambient temperature of the vehicle is below a first preset value.
In one embodiment of the present invention, the ECU6 controls the MCH alumina ceramic heater 4 to stop heating when the temperature at which the MCH alumina ceramic heater 4 preheats the high-voltage common rail 1 exceeds a second preset value.
Fig. 3 is a schematic flow chart of a heating method of a common rail system of a diesel engine according to an embodiment of the present invention. As shown in fig. 3, in a second aspect, a heating method of a common rail system of a diesel engine according to a preferred embodiment of the present invention includes: in step S1, the rail pressure temperature sensor 3 monitors the temperature and pressure in the high-pressure common rail pipe 1 in real time, and transmits the monitoring result to the ECU 6. In step S2, when the ambient temperature of the vehicle is lower than the first preset value, the ECU6 controls the MCH alumina ceramic heater 4 to preheat the high-pressure common rail pipe 1. In step S3, when the temperature at which the MCH alumina ceramic heater 4 preheats the high-voltage common rail 1 exceeds a second preset value, the ECU6 controls the MCH alumina ceramic heater 4 to stop heating. Wherein, MCH alumina ceramic heater 4 and PLV valve 2 fixed connection, and PLV valve 2 fixed establishment is in the one end of high pressure common rail pipe 1. Wherein, the rail pressure temperature sensor 3 is arranged in the other end of the high-pressure common rail pipe 1.
In one embodiment of the invention, the MCH alumina ceramic heater 4 is respectively electrically connected with an air inlet preheating pin 7 of the ECU6 and the positive and negative electrodes of the battery 5 of the whole vehicle.
In practical application, the heating device and the method for the common rail system of the diesel engine are based on a common rail pipe heating scheme of MCH alumina high-temperature ceramic materials, the scheme is simple in structure, only needs to be slightly changed on an original common rail pipe, does not need to additionally increase a microcontroller and a control strategy, and is good in heating effect. The MCH alumina high-temperature ceramic material has high power density, high heating speed (more than 900 ℃ in 30 seconds), high energy-saving efficiency (more than 90 percent of thermal efficiency), and no attenuation of power after long-term use; the voltage and power adaptability is high (the voltage is 12V-380V, the power is 50W-2000W), the price is low, and the like, and the method is very suitable for the invention. The embodiment is as follows: the modified MCH alumina ceramic heater 4 (hollow) is arranged on the PLV valve 2 (rail pressure limiting valve), connectors of the heater 4 are respectively connected with an ECU6 air inlet preheating pin 7 and a storage battery 5 positive and secondary stage, the PLV valve 2 is arranged at the right end of a common rail pipe, a rail pressure temperature sensor 3 is integrated with a temperature and pressure integrated sensor, and the rail pressure temperature sensor 3 is arranged at the left end of a high-pressure common rail pipe 1.
The MCH alumina ceramic heater 4 is controlled by signals of an air inlet preheating controller of the diesel engine, the diesel oil preheating time can be calibrated according to the preheating effect, and whether the air inlet preheating is reserved or not can be selected according to the effect. When the diesel engine works, the engine judges the current temperature according to the ambient temperature sensor, when the ambient temperature is detected to be lower than a certain limit value, the diesel oil preheating is started, the diesel oil preheating temperature is monitored through the rail pressure temperature sensor 3, the longer the preheating time at the certain ambient temperature is, the higher the diesel oil temperature is, the preheating time can be controlled through calibration, the preheating time is required to prevent the oil temperature from being too high, and the good starting effect is ensured.
In summary, the heating device and method for the common rail system of the diesel engine of the present invention have the following beneficial effects:
1. the MCH alumina ceramic heater 4 with high heating efficiency, stable heating performance and acid and alkali resistance is adopted, the condition that a high-pressure oil way is polluted can be effectively avoided on the premise that the volume and pressure of a common rail cavity are not influenced, the stability of the heating effect is ensured, heated diesel oil can be provided at the instant of starting an engine, and the cooling starting performance of the engine is effectively improved;
2. simple structure arranges the convenience, need not additionally increase other configurations, and because heating control system borrows former diesel engine preheating system that admits air, consequently also need not additionally develop other control strategy, in addition because the use that the common rail pipe preheats, the user can cancel preheating device that admits air, and the cost further reduces.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. A heating device of a common rail system of a diesel engine is characterized by comprising:
a high pressure common rail pipe;
a PLV valve disposed within one end of the high pressure common rail pipe;
the rail pressure temperature sensor is arranged in the other end of the high-pressure common rail pipe and is electrically connected with the ECU; and
the heater is fixedly connected with one end, close to the rail pressure temperature sensor, of the PLV valve and is electrically connected with the ECU and a vehicle storage battery respectively;
wherein the ECU is capable of controlling the heater to preheat the high pressure common rail.
2. The heating device for the common rail system of the diesel engine as set forth in claim 1, wherein the heater is a MCH alumina ceramic heater.
3. The heating device of the common rail system of the diesel engine as claimed in claim 2, wherein the MCH alumina ceramic heater is electrically connected with an inlet preheating pin of the ECU and the positive and negative electrodes of the battery of the whole vehicle respectively.
4. The heating device of a common rail system of diesel engines as claimed in claim 3, wherein the rail pressure temperature sensor is configured to monitor the temperature and pressure in the high pressure common rail pipe in real time and send the temperature and pressure in the high pressure common rail pipe to the ECU in real time.
5. The heating device of the common rail system of the diesel engine as claimed in claim 4, wherein the ECU controls the MCH alumina ceramic heater to preheat the high-pressure common rail pipe when the temperature of the environment where the vehicle is located is lower than a first preset value.
6. The heating device of the common rail system of the diesel engine as claimed in claim 4, wherein the ECU controls the MCH alumina ceramic heater to stop heating when the temperature of the MCH alumina ceramic heater preheating the high-pressure common rail pipe exceeds a second preset value.
7. A heating method of a common rail system of a diesel engine is characterized by comprising the following steps:
the rail pressure temperature sensor monitors the temperature and the pressure in the high-pressure common rail pipe in real time and transmits the monitoring result to the ECU;
when the temperature of the environment where the vehicle is located is lower than a first preset value, the ECU controls an MCH alumina ceramic heater to preheat the high-pressure common rail pipe;
when the temperature for preheating the high-pressure common rail pipe by the MCH alumina ceramic heater exceeds a second preset value, the ECU controls the MCH alumina ceramic heater to stop heating;
the MCH alumina ceramic heater is fixedly connected with the PLV valve, and the PLV valve is fixedly arranged in one end of the high-pressure common rail pipe;
the rail pressure temperature sensor is arranged at the other end of the high-pressure common rail pipe.
8. The heating method of the common rail system of the diesel engine as claimed in claim 7, wherein the MCH alumina ceramic heater is electrically connected with an air inlet preheating pin of the ECU and the positive and negative electrodes of a battery of a whole vehicle respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210436548.5A CN114718786A (en) | 2022-04-25 | 2022-04-25 | Heating device and method for common rail system of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210436548.5A CN114718786A (en) | 2022-04-25 | 2022-04-25 | Heating device and method for common rail system of diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN114718786A true CN114718786A (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210436548.5A Pending CN114718786A (en) | 2022-04-25 | 2022-04-25 | Heating device and method for common rail system of diesel engine |
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| CN (1) | CN114718786A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030054502A (en) * | 2001-12-26 | 2003-07-02 | 기아자동차주식회사 | A Cold Start Control System for Common Rail-Direct Injection- Diesel Engine |
| US20120224839A1 (en) * | 2009-11-06 | 2012-09-06 | Eltek S.P.A. | Electric heater, heating device and heating system |
| CN206092221U (en) * | 2016-10-20 | 2017-04-12 | 湖北铱派电子科技股份有限公司 | Diesel engine high pressure fuel feeding oil circuit heating device |
| CN211598881U (en) * | 2019-11-13 | 2020-09-29 | 潍柴动力股份有限公司 | Fuel system for diesel engine, diesel engine with fuel system and vehicle |
| CN212106097U (en) * | 2020-03-30 | 2020-12-08 | 济南凯瑞特铸造有限公司 | Methanol engine starting fuel nozzle, preheater thereof and methanol engine |
| CN113202670A (en) * | 2021-05-14 | 2021-08-03 | 奇瑞汽车股份有限公司 | Heating method, device, equipment and storage medium for fuel oil rail |
| CN113236459A (en) * | 2021-06-09 | 2021-08-10 | 上海交通大学 | Device and method for realizing flash-boiling spraying by heating oil rail |
| CN217107277U (en) * | 2022-04-25 | 2022-08-02 | 广西玉柴机器股份有限公司 | Heating device of common rail system of diesel engine |
-
2022
- 2022-04-25 CN CN202210436548.5A patent/CN114718786A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030054502A (en) * | 2001-12-26 | 2003-07-02 | 기아자동차주식회사 | A Cold Start Control System for Common Rail-Direct Injection- Diesel Engine |
| US20120224839A1 (en) * | 2009-11-06 | 2012-09-06 | Eltek S.P.A. | Electric heater, heating device and heating system |
| CN206092221U (en) * | 2016-10-20 | 2017-04-12 | 湖北铱派电子科技股份有限公司 | Diesel engine high pressure fuel feeding oil circuit heating device |
| CN211598881U (en) * | 2019-11-13 | 2020-09-29 | 潍柴动力股份有限公司 | Fuel system for diesel engine, diesel engine with fuel system and vehicle |
| CN212106097U (en) * | 2020-03-30 | 2020-12-08 | 济南凯瑞特铸造有限公司 | Methanol engine starting fuel nozzle, preheater thereof and methanol engine |
| CN113202670A (en) * | 2021-05-14 | 2021-08-03 | 奇瑞汽车股份有限公司 | Heating method, device, equipment and storage medium for fuel oil rail |
| CN113236459A (en) * | 2021-06-09 | 2021-08-10 | 上海交通大学 | Device and method for realizing flash-boiling spraying by heating oil rail |
| CN217107277U (en) * | 2022-04-25 | 2022-08-02 | 广西玉柴机器股份有限公司 | Heating device of common rail system of diesel engine |
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