CN205445809U - LNG diesel dual -fuel engine natural gas electrical system - Google Patents
LNG diesel dual -fuel engine natural gas electrical system Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000000446 fuel Substances 0.000 title claims abstract description 36
- 239000003345 natural gas Substances 0.000 title claims abstract description 31
- 230000009977 dual effect Effects 0.000 title description 6
- 239000007789 gas Substances 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims 3
- 239000000523 sample Substances 0.000 claims 3
- 239000000498 cooling water Substances 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 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
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
本实用新型公开了一种LNG/柴油双燃料发动机天然气电控系统，包括燃气供给系统、空气供给系统、混合器和控制系统，燃气供给系统包括电磁阀和喷射阀，空气供给系统包括增压器；控制系统包括转速传感器、油门齿条位置传感器、冷却水温传感器、排气温度传感器、进气压力传感器、燃气压力传感器、模式选择开关、ECU、指示灯；转速传感器、油门齿条位置传感器、冷却水温传感器、排气温度传感器、进气压力传感器、燃气压力传感器、指示灯、电磁阀、喷射阀、模式选择开关分别连接到ECU。该系统结构简单，改造方便，实现了双燃料模式和纯柴油模式之间平稳切换。
The utility model discloses a natural gas electric control system for an LNG/diesel dual-fuel engine, which includes a gas supply system, an air supply system, a mixer and a control system, the gas supply system includes a solenoid valve and an injection valve, and the air supply system includes a supercharger ;The control system includes speed sensor, throttle rack position sensor, cooling water temperature sensor, exhaust temperature sensor, intake pressure sensor, gas pressure sensor, mode selection switch, ECU, indicator light; speed sensor, throttle rack position sensor, cooling The water temperature sensor, exhaust temperature sensor, intake pressure sensor, gas pressure sensor, indicator light, solenoid valve, injection valve, and mode selection switch are respectively connected to the ECU. The system is simple in structure, easy to modify, and realizes smooth switching between dual-fuel mode and pure diesel mode.
Description
技术领域technical field
本实用新型涉及一种LNG/柴油双燃料发动机，特别是指一种LNG/柴油双燃料发动机天然气电控系统。The utility model relates to an LNG/diesel dual-fuel engine, in particular to a natural gas electric control system for an LNG/diesel dual-fuel engine.
背景技术Background technique
随着石油资源的日益缺乏以及各国环保法规越来越严格，天然气以其价格低廉、资源丰富、清洁高效的特点在代用燃料方面将拥有广阔的市场前景。在世界发达国家中，天然气在能源结构中的比例已经高达24％左右。现在天然气在世界范围内正经历着一个快速发展的时期。根据相关预测，在未来的几十年内，天然气在全球范围内的能源结构中所占比重将不断加大，天然气的广泛应用将成为趋势。With the increasing shortage of petroleum resources and the increasingly stringent environmental protection regulations of various countries, natural gas will have a broad market prospect as an alternative fuel due to its low price, abundant resources, clean and efficient characteristics. In the world's developed countries, the proportion of natural gas in the energy structure has reached about 24%. Now natural gas is experiencing a period of rapid development in the world. According to relevant predictions, in the next few decades, the proportion of natural gas in the global energy structure will continue to increase, and the wide application of natural gas will become a trend.
近年来，通过采用提高压缩比、多点喷射、涡轮增压等发动机新技术，天然气发动机在动力性能方面与传统汽柴油发动机已经相差无几。而且由于使用天然气燃料能直接有效地降低航运费用、减小污染，因此天然气/柴油双燃料发动机作为天然气在船舶上的重要应用越来越受到国内外柴油机生产厂商的重视，随着天然气产业基础配套设施的完善，双燃料发动机将得到更广泛的应用。采用新能源作为船舶动力的主要来源，积极开发新能源动力装置和新能源动力船舶是应对低碳经济发展趋势的中长期解决方案。In recent years, through the adoption of new engine technologies such as increasing the compression ratio, multi-point injection, and turbocharging, the power performance of natural gas engines is almost the same as that of traditional gasoline and diesel engines. Moreover, since the use of natural gas fuel can directly and effectively reduce shipping costs and reduce pollution, natural gas/diesel dual-fuel engines, as an important application of natural gas on ships, have attracted more and more attention from domestic and foreign diesel engine manufacturers. With the improvement of facilities, dual-fuel engines will be more widely used. Using new energy as the main source of ship power, and actively developing new energy power devices and new energy-powered ships is a medium- and long-term solution to the development trend of low-carbon economy.
为了克服引燃柴油量不能灵活控制的缺陷，授权公告号为CN204003120U，名称为“双燃料发动机电控系统”的实用新型专利公布了一种双燃料电控系统；该系统电控单元与高压截止阀和步进电机阀以及油量限制机构相连，天然气量和引燃柴油量都可以灵活控制，排放指标好，启动、怠速时以纯柴油工作，当转速超过某一设定值时，发动机的控制系统发出指令，使其自动转换为双燃料工作方式。但是，首先，该系统油量控制和燃气控制集中在一个控制单元中，不但控制复杂，其自身稳定性需要进一步验证；其次，其运行模式转换只考虑到了发动机转速，并未考虑发动机其他工况，如排气温度等，以及燃气压力是否符合喷射要求，并且未考虑到发动机运行状态异常时报警退出功能。In order to overcome the defect that the amount of ignited diesel oil cannot be flexibly controlled, a utility model patent with the authorized announcement number CN204003120U and the name "Dual Fuel Engine Electronic Control System" has announced a dual fuel electronic control system; The valve is connected with the stepper motor valve and the fuel limit mechanism, the amount of natural gas and pilot diesel can be flexibly controlled, and the emission index is good. It works with pure diesel when starting and idling. When the speed exceeds a certain set value, the control of the engine The system sends an instruction to make it automatically switch to the dual-fuel working mode. However, first of all, the oil volume control and gas control of the system are concentrated in one control unit, which not only complicates the control, but also requires further verification of its own stability; secondly, its operating mode conversion only takes into account the engine speed and does not consider other engine operating conditions , such as exhaust temperature, etc., and whether the gas pressure meets the injection requirements, and does not take into account the alarm and exit function when the engine is running abnormally.
发明内容Contents of the invention
本实用新型的目的在于提供一种LNG/柴油双燃料发动机天然气电控系统，能够保证发动机在双燃料模式和纯柴油模式之间平稳切换。The purpose of the utility model is to provide a natural gas electronic control system for LNG/diesel dual-fuel engine, which can ensure the smooth switching of the engine between the dual-fuel mode and the pure diesel mode.
为实现上述目的，本实用新型所设计的LNG/柴油双燃料发动机天然气电控系统包括燃气供给系统、空气供给系统、混合器和控制系统，所述燃气供给系统包括电磁阀和喷射阀，所述空气供给系统包括增压器；所述控制系统包括转速传感器、油门齿条位置传感器、冷却水温传感器、排气温度传感器、进气压力传感器、燃气压力传感器、模式选择开关、ECU、指示灯(包括允许喷气指示灯和报警指示灯等)；所述转速传感器、油门齿条位置传感器、冷却水温传感器、排气温度传感器设置在发动机本体上；所述进气压力传感器设置在增压器上，所述燃气压力传感器设置在喷射阀前的天然气管路上；所述转速传感器、油门齿条位置传感器、冷却水温传感器、排气温度传感器、进气压力传感器、燃气压力传感器的测量信号输出端与ECU的测量信号输入端相连；所述ECU的控制信号输出端与指示灯、电磁阀、喷射阀的控制信号输入端相连；所述模式选择开关的控制信号输出端与ECU的控制信号输入端相连。该系统只在允许喷气指示灯亮的情况下才能手动切换运行模式进入双燃料模式，且具有自检功能。在系统初始化时对部分传感器和天然气喷射阀进行自检，若检测到故障时发出报警信号并禁用双燃料模式。In order to achieve the above purpose, the LNG/diesel dual-fuel engine natural gas electronic control system designed by the utility model includes a gas supply system, an air supply system, a mixer and a control system, and the gas supply system includes a solenoid valve and an injection valve. The air supply system includes a supercharger; the control system includes a speed sensor, an accelerator rack position sensor, a cooling water temperature sensor, an exhaust temperature sensor, an intake air pressure sensor, a gas pressure sensor, a mode selection switch, an ECU, an indicator light (including Allow jet indicator light and alarm indicator light, etc.); the speed sensor, the throttle rack position sensor, the cooling water temperature sensor, and the exhaust temperature sensor are arranged on the engine body; the intake air pressure sensor is arranged on the supercharger, and the The gas pressure sensor is arranged on the natural gas pipeline in front of the injection valve; the measurement signal output end of the speed sensor, the throttle rack position sensor, the cooling water temperature sensor, the exhaust gas temperature sensor, the intake pressure sensor, and the gas pressure sensor is connected with the ECU. The measurement signal input terminal is connected; the control signal output terminal of the ECU is connected with the control signal input terminals of the indicator light, solenoid valve and injection valve; the control signal output terminal of the mode selection switch is connected with the control signal input terminal of the ECU. The system can only manually switch the operating mode to dual-fuel mode when the jet indicator light is on, and it has a self-diagnosis function. When the system is initialized, some sensors and natural gas injection valves are self-checked. If a fault is detected, an alarm signal is sent and the dual-fuel mode is disabled.
优选地，所述ECU包括PLC和单片机，所述PLC和单片机通过电平转换器相连。前述各传感器、指示灯、电磁阀、喷射阀和模式选择开关连接到PLC上。由于PLC一般为RS485接口，单片机一般为TTL接口，因此PLC与单片机之间需要通过TTL电平转485转换器进行转接。PLC负责接收传感器数据并控制执行器；单片机负责运行控制策略。进一步地，所述单片机为Arduino，Arduino是32位单片机，具有运行速度快，响应时间短的优点。进一步地，所述电平转换器采用NS485-IV，NS485-IV是TTL电平与RS-485信号互转的接口转换器，具有体积小、传输距离远、速率高、性能稳定等特性。Preferably, the ECU includes a PLC and a single-chip microcomputer, and the PLC and the single-chip microcomputer are connected through a level shifter. The aforementioned sensors, indicator lights, solenoid valves, injection valves and mode selection switches are connected to the PLC. Since the PLC generally has an RS485 interface, and the single-chip microcomputer generally has a TTL interface, the PLC and the single-chip microcomputer need to be transferred through a TTL level-to-485 converter. The PLC is responsible for receiving sensor data and controlling the actuators; the microcontroller is responsible for running the control strategy. Further, the single-chip microcomputer is Arduino, and Arduino is a 32-bit single-chip microcomputer, which has the advantages of fast operation speed and short response time. Further, the level converter adopts NS485-IV, which is an interface converter for mutual conversion between TTL level and RS-485 signal, and has the characteristics of small size, long transmission distance, high speed and stable performance.
可选地，所述燃气供给系统还包括LNG储罐、气体总阀、汽化器、滤清器、减压阀、缓冲罐，所述LNG储罐、气体总阀、汽化器、滤清器、减压阀、缓冲罐、电磁阀、喷射阀和混合器依次相连；所述空气供给系统还包括空滤器，所述空滤器、增压器、混合器依次相连。燃气供给系统中天然气依次经过LNG储罐、气体总阀、汽化器、滤清器、减压阀、缓冲罐、电磁阀、喷射阀，最后在混合器中与空气混合喷入柴油机气缸中。Optionally, the gas supply system further includes an LNG storage tank, a main gas valve, a vaporizer, a filter, a pressure reducing valve, and a buffer tank, and the LNG storage tank, a main gas valve, a vaporizer, a filter, a pressure reducing The valve, buffer tank, electromagnetic valve, injection valve and mixer are connected in sequence; the air supply system also includes an air filter, and the air filter, supercharger and mixer are connected in sequence. In the gas supply system, the natural gas passes through the LNG storage tank, the main gas valve, the carburetor, the filter, the pressure reducing valve, the buffer tank, the solenoid valve, the injection valve, and finally mixes with air in the mixer and sprays it into the cylinder of the diesel engine.
本实用新型的有益效果是：1)结构简单，改造方便，实现了天然气替代柴油燃烧，柴油机工作在70％～75％负荷、双燃料模式下替代率不低于70％；2)ECU处理能力强，运行稳定，系统具有故障自检功能，在发动机不具备使用双燃料条件或发生系统故障时能自动从双燃料模式切换回纯柴油模式，同时关闭天然气喷射阀；3)通过精确控制天然气占空比，保证了发动机在双燃料模式和纯柴油模式之间平稳切换，在模式切换时发动机转速未发生较大波动，在正常情况下未出现天然气量供给的较大波动。The beneficial effects of the utility model are: 1) the structure is simple, the transformation is convenient, and the combustion of natural gas instead of diesel is realized, the diesel engine works at 70% to 75% load, and the replacement rate is not less than 70% under the dual-fuel mode; 2) ECU processing capacity Strong, stable operation, the system has a fault self-check function, when the engine does not have the condition to use dual fuel or a system failure occurs, it can automatically switch from dual fuel mode to pure diesel mode, and at the same time close the natural gas injection valve; 3) through precise control of natural gas The empty ratio ensures the smooth switching of the engine between the dual-fuel mode and the pure diesel mode. During the mode switching, the engine speed does not fluctuate greatly, and there is no large fluctuation in natural gas supply under normal conditions.
附图说明Description of drawings
图1为本实用新型所设计的LNG/柴油双燃料发动机天然气电控系统的结构示意图。Fig. 1 is a structural schematic diagram of the natural gas electronic control system of the LNG/diesel dual fuel engine designed by the utility model.
图2为图1中ECU的结构示意图。FIG. 2 is a schematic structural diagram of the ECU in FIG. 1 .
其中：LNG储罐1、气体总阀2、汽化器3、滤清器4、减压阀5、缓冲罐6、电磁阀7、喷射阀8、混合器9、燃气压力传感器10、发动机本体11、转速传感器12、油门齿条位置传感器13、冷却水温传感器14、排气温度传感器15、ECU16、进气压力传感器17、模式选择开关18、增压器19、空滤器20、指示灯21、PLC22、Arduino23Among them: LNG storage tank 1, gas main valve 2, carburetor 3, filter 4, pressure reducing valve 5, buffer tank 6, solenoid valve 7, injection valve 8, mixer 9, gas pressure sensor 10, engine body 11, Speed sensor 12, accelerator rack position sensor 13, cooling water temperature sensor 14, exhaust temperature sensor 15, ECU16, intake pressure sensor 17, mode selection switch 18, supercharger 19, air filter 20, indicator light 21, PLC22, Arduino23
具体实施方式detailed description
下面结合附图和具体实施例对本实用新型作进一步的详细说明。Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.
如图1～2所示，本实用新型所设计的LNG/柴油双燃料发动机天然气电控系统，包括燃气供给系统、空气供给系统、混合器9和控制系统。As shown in Figures 1-2, the LNG/diesel dual-fuel engine natural gas electronic control system designed by the utility model includes a gas supply system, an air supply system, a mixer 9 and a control system.
燃气供给系统包括依次相连的LNG储罐1、气体总阀2、汽化器3、滤清器4、减压阀5、缓冲罐6、电磁阀7和喷射阀8，喷射阀8连接至混合器9。The gas supply system includes an LNG storage tank 1, a gas main valve 2, a carburetor 3, a filter 4, a pressure reducing valve 5, a buffer tank 6, a solenoid valve 7 and an injection valve 8 connected in sequence, and the injection valve 8 is connected to a mixer 9 .
空气供给系统包括增压器19和空滤器20，空滤器20、增压器19、混合器9依次相连。The air supply system includes a supercharger 19 and an air filter 20, and the air filter 20, the supercharger 19 and the mixer 9 are connected in sequence.
控制系统包括转速传感器12、油门齿条位置传感器13、冷却水温传感器14、排气温度传感器15、进气压力传感器17、燃气压力传感器10、模式选择开关18、ECU16和指示灯21。指示灯21包括允许喷气指示灯和报警指示灯。其中，模式选择开关18、指示灯21安装在控制柜面板上。转速传感器12、油门齿条位置传感器13、冷却水温传感器14、排气温度传感器15安装在发动机本体11上。进气压力传感器17设置在增压器19上，燃气压力传感器10设置在喷射阀8前的天然气管路上。The control system includes a rotational speed sensor 12 , an accelerator rack position sensor 13 , a cooling water temperature sensor 14 , an exhaust gas temperature sensor 15 , an intake pressure sensor 17 , a gas pressure sensor 10 , a mode selection switch 18 , an ECU 16 and an indicator light 21 . Indicator light 21 comprises allowing jetting indicator light and warning indicator light. Wherein, the mode selection switch 18 and the indicator light 21 are installed on the control cabinet panel. A rotation speed sensor 12 , an accelerator rack position sensor 13 , a cooling water temperature sensor 14 and an exhaust gas temperature sensor 15 are installed on the engine body 11 . The intake air pressure sensor 17 is arranged on the supercharger 19 , and the gas pressure sensor 10 is arranged on the natural gas pipeline before the injection valve 8 .
ECU16包括PLC22和Arduino23，二者之间采用NS485-IV实现TTL电平与RS-485信号互转。转速传感器12、油门齿条位置传感器13、冷却水温传感器14、排气温度传感器15、进气压力传感器17、燃气压力传感器10的测量信号输出端与PLC22的测量信号输入端相连。PLC22的控制信号输出端与指示灯21、电磁阀7、喷射阀8的控制信号输入端相连。模式选择开关18的控制信号输出端与PLC22的控制信号输入端相连。ECU16 includes PLC22 and Arduino23, and NS485-IV is used between them to realize mutual conversion between TTL level and RS-485 signal. The measurement signal output terminals of the rotational speed sensor 12 , the throttle rack position sensor 13 , the cooling water temperature sensor 14 , the exhaust gas temperature sensor 15 , the intake pressure sensor 17 , and the gas pressure sensor 10 are connected to the measurement signal input terminal of the PLC22 . The control signal output terminal of PLC22 is connected with the control signal input terminals of indicator light 21 , solenoid valve 7 and injection valve 8 . The control signal output end of the mode selection switch 18 is connected with the control signal input end of PLC22.
上述LNG/柴油双燃料发动机天然气电控系统工作时，当允许喷气指示灯亮时，且模式选择开关18打到双燃料模式时，ECU接到到模式切换信号，根据当前柴油机运行状态，发出执行指令，喷射阀8开启，实现运行模式的切换。当发动机在双燃料模式下运行状态异常，或者运行状态不满足双燃料模式要求的情况，ECU发出报警信号，并发出执行指令，报警指示灯亮，喷射阀8关闭，实现从双燃料模式切换到纯柴油模式。在双燃料模式下，当人为想切换运行模式时，将模式选择开关18打到纯柴油模式，ECU收到控制指令后对喷射阀8发出控制指令，喷射阀8关闭，完成模式切换。When the above-mentioned LNG/diesel dual-fuel engine natural gas electronic control system is working, when the allow jet indicator light is on, and the mode selection switch 18 is set to the dual-fuel mode, the ECU receives a mode switching signal and sends an execution command according to the current diesel engine operating status , the injection valve 8 is opened to realize the switching of the operating mode. When the engine is running abnormally in the dual-fuel mode, or the running state does not meet the requirements of the dual-fuel mode, the ECU will send out an alarm signal and issue an execution command, the alarm indicator light will be on, and the injection valve 8 will be closed to realize switching from the dual-fuel mode to the pure fuel mode. Diesel mode. In the dual-fuel mode, when people want to switch the operating mode, the mode selection switch 18 is set to the pure diesel mode, and the ECU sends a control command to the injection valve 8 after receiving the control command, and the injection valve 8 is closed to complete the mode switching.
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| CN107061052A (en) * | 2016-12-05 | 2017-08-18 | 江苏弗莱因工程技术有限公司 | LNG supply systems |
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