CN214944586U - Dual-fuel intelligent combustion system - Google Patents
Dual-fuel intelligent combustion system Download PDFInfo
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- CN214944586U CN214944586U CN202121484075.3U CN202121484075U CN214944586U CN 214944586 U CN214944586 U CN 214944586U CN 202121484075 U CN202121484075 U CN 202121484075U CN 214944586 U CN214944586 U CN 214944586U
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Abstract
The utility model belongs to dual fuel engine combustion system field specifically is a dual fuel intelligence combustion system. The problem of difficulty in cold start of methanol is solved, combustion efficiency and thermal efficiency of an engine are improved, fuel economy and emission cleanness of the engine are improved, the engine comprises a cylinder body, a cylinder cover, a piston, a methanol fuel injector, a diesel fuel injector and an ECU (electronic control unit), the cylinder body, the cylinder cover and the piston form a combustion chamber, the cylinder cover is arranged right above the cylinder body, the piston is arranged in the cylinder body, the combustion chamber is provided with an air inlet channel and an air exhaust channel, the combustion chamber is internally provided with the methanol fuel injector for injecting alcohol fuel in the cylinder and the diesel fuel injector for injecting pilot fuel diesel in the cylinder, and the methanol fuel injector and the diesel fuel injector are respectively controlled by the two ECU electronic control units. The utility model discloses a nimble switching of different combustion modes of control, the problem of the cold start difficulty of methanol fuel is effectively solved to the physical and chemical properties of the different fuels of rational utilization, has improved the thermal efficiency of engine.
Description
Technical Field
The utility model belongs to dual fuel engine combustion system field specifically is a dual fuel intelligence combustion system.
Background
Under the dual background of shortage of petroleum resources and environmental pollution, development of cheap and clean alternative energy sources has important practical significance. Methanol fuel is a renewable energy source and is widely available. In recent years, methanol fuel is widely used in dual-fuel engines due to its advantages of wide fire range, small molecular weight, high oxygen content, large latent heat of vaporization, etc. However, because methanol has large latent heat of vaporization, the engine is difficult to start in cold, and even the engine cannot be started in low-temperature environment, so that the use of the engine is limited. Most of the current researches adopt an air inlet injection method, and few researches on a methanol and diesel cylinder internal double-injection mode are carried out.
The basic idea of the homogeneous mixed gas compression ignition (HCCI) combustion mode is to solve the disadvantages of low efficiency of the traditional gasoline engine and high NOx and soot emission of the traditional diesel engine, and the characteristics of low NOx and soot emission of the gasoline engine and high efficiency of the diesel engine are realized by adopting a mixed gas organization mode of homogeneous premixing of the gasoline engine and a compression combustion ignition mode of the diesel engine. Compared with the conventional premixed combustion and diffusion combustion, the homogeneous mixture compression ignition combustion mode has the advantages of low particulate emissions, high thermal efficiency, and the like, and it has the advantage of fuel flexibility, which enables the use of various fuels including gasoline, diesel, natural gas, Liquefied Petroleum Gas (LPG), methanol, ethanol, dimethyl ether, and mixed fuels, and the like. Although the research on homogeneous-mixture gas compression ignition combustion mode has achieved a series of results, there are still many limitations. Control of the ignition timing and combustion rate of the HCCI mode is quite difficult, as its combustion is dominated by chemical reaction kinetics. In order to expand the load range of the engine in the HCCI mode and obtain higher indicated thermal efficiency under different loads, a dual-fuel HCCI combustion mode is provided. The diesel/methanol dual-fuel homogeneous compression ignition combustion mode is adopted, so that the problem that the methanol is difficult to start on an engine in a cold mode can be overcome, and the defect of the HCCI combustion mode can be effectively overcome.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an improve the problem of methyl alcohol cold start difficulty, improve engine combustion efficiency and thermal efficiency, improve engine fuel economy and emission cleanliness nature, provide a dual-fuel intelligent combustion system.
The utility model adopts the following technical proposal: the utility model provides a dual-fuel intelligent combustion system, includes cylinder body, cylinder cap, piston, methyl alcohol fuel injector, diesel oil injector and ECU electrical unit, cylinder body, cylinder cap and piston form the combustion chamber, the cylinder cap sets up directly over the cylinder body, the piston sets up in the cylinder body, the combustion chamber is provided with intake duct and exhaust passage, the combustion chamber in be provided with to the methyl alcohol fuel injector of injecting alcohol fuel in the jar and to the diesel oil injector of injecting the pilot fuel diesel oil in the jar, methyl alcohol fuel injector and diesel oil injector are controlled respectively through two ECU electrical unit.
Furthermore, the top surface of the piston is eccentrically provided with a omega-shaped pit, the methanol fuel injector is obliquely arranged right above the center of the omega-shaped pit, the included angle between the central axis of the methanol fuel injector and the central axis of the cylinder is 0-10 degrees, the diesel injector is obliquely arranged above the omega-shaped pit and is not overlapped with the methanol fuel injector, and the included angle between the central axis of the diesel injector and the central axis of the cylinder is 10-25 degrees, as shown in figure 2.
Furthermore, the input ends of the two ECU electronic control units are respectively connected with a cylinder pressure sensor, a crankshaft position sensor and a camshaft sensor, the cylinder pressure sensor is installed on a cylinder cover, the crankshaft position sensor is installed on a machine body close to a flywheel disc, the camshaft sensor is installed on the machine body close to a camshaft, and as shown in figure 1, detected engine operation data are transmitted to the two ECU electronic control units, so that the current operation working condition of the engine is obtained; and the temperature and pressure sensors for air inlet and the temperature and pressure sensors for exhaust transmit the acquired temperature and pressure signals to the two ECU electronic control units respectively, and the ECU electronic control units are used for detecting the current environmental conditions of the engine.
The two ECU electronic control units judge the working environment and the operating condition of the current engine according to the data transmitted by each sensor, flexibly switch different combustion modes by respectively controlling two sets of injection systems of methanol and diesel oil according to different performance requirements of the engine on the current state, and mainly perform dual-fuel homogeneous compression combustion.
A control method of a dual-fuel intelligent combustion system adopts a pure diesel oil working mode during cold start to ensure stable combustion and normal start.
When the engine runs in a low-speed and low-load working condition, namely the speed is in the range of 800rpm-1200rpm, PmeWhen the pressure is less than 0.3MPa, the methanol oil injector and the diesel oil injector are respectively controlled by the two ECU, the methanol fuel is injected in the air intake stroke, homogeneous premixed gas is formed in the cylinder, the diesel oil fuel is injected later than the methanol fuel in the air intake stroke, the methanol fuel is ignited, the fuel economy is ensured, and the emission is reduced.
When the engine runs in the working condition of low rotating speed and high load, namely the rotating speed is in the range of 800rpm-1200rpm, and P is more than 0.3MPameWhen the pressure is less than 1MPa, a pure diesel oil working mode is adopted, the combustion stability is ensured, and the detonation is inhibited;
when the engine operates in a medium-speed working condition, namely the speed is in a range of 1200rpm-1800rpm, the methanol oil injector and the diesel oil injector are respectively controlled by the two ECU units, the methanol fuel and the diesel oil fuel are injected in the early stage of a compression stroke to form a homogeneous mixed gas, and the homogeneous mixed gas is ignited by spontaneous combustion when the piston is compressed to be near the top dead center, so that an HCCI combustion mode is realized;
when the engine runs in the high-speed low-load working condition, namely the speed is greater than 1800rpm, PmeWhen the pressure is less than 0.3MPa, the methanol fuel injector and the diesel fuel injector are respectively controlled by the two ECU units, the methanol fuel and the diesel fuel are injected in the early stage of a compression stroke to form a homogeneous mixed gas, and the homogeneous mixed gas is ignited by spontaneous combustion when a piston is compressed to be near the upper dead point, so that an HCCI combustion mode is realized.
When the engine runs in a high-speed and high-load working condition, namely the speed is more than 1800rpm, PmeWhen the pressure is more than 0.6MPa, a pure diesel oil working mode is adopted for inhibiting detonation and improving the heat efficiency.
Compared with the prior art, the utility model discloses a set up two sets of fuel injection system in the jar, realize the make full use of different fuels. By controlling the flexible switching of different combustion modes and reasonably utilizing the physical and chemical properties of different fuels, the problem of difficult cold start of methanol fuel is effectively solved, and the heat efficiency of the engine is improved. By using clean fuel methanol, the problem of serious engine emission pollution is improved, and the fuel economy of the engine is improved.
Drawings
FIG. 1 is a detailed layout of an intelligent combustion system;
FIG. 2 is a schematic diagram of a smart combustion system;
labeled as: 1. the device comprises a cylinder body, a piston 2, a cylinder cover 3, an exhaust passage 4, a methanol oil injector 5, a diesel oil injector 6 and an air inlet passage 7.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1-2, the utility model discloses a dual fuel intelligence combustion system, including cylinder body 1, cylinder cap 3, piston 2, methyl alcohol fuel feeding system, diesel fuel feeding system, ECU electrical unit, cylinder body 1, cylinder cap 3 and piston 2 form the combustion chamber, and the cylinder cap is placed directly over the cylinder body, and the piston is placed in the cylinder body, the combustion chamber is provided with intake duct 7 and exhaust passage 4, and the key lies in be provided with to the main alcohol fuel's of in jar methyl alcohol fuel injector 5 in the combustion chamber, still be provided with to the interior diesel fuel injector 6 that ignites fuel diesel of jar that injects of jar. The injection strategies of the methanol fuel and the diesel fuel are respectively controlled by the two ECU electronic control units, so that the homogeneous mixed gas compression ignition combustion mode of the methanol fuel and the diesel fuel under the common working condition is realized, and different combustion modes are flexibly switched under different working conditions.
The top surface of the piston 2 is eccentrically provided with
A type pit, wherein the methanol fuel injector 5 is obliquely arranged
The central axis of the methanol fuel injector 5 and the central axis of the cylinder form an included angle of 0-10 degrees right above the center of the pit, and the diesel injector 6 is obliquely arranged
A certain distance is reserved between the upper part of the mould pit and the methanol fuel injector 5, and the included angle between the central axis of the diesel injector 6 and the central axis of the cylinder is 10-25 degrees, as shown in figure 1.
When the engine runs, the cylinder pressure sensor, the crankshaft position sensor, the camshaft sensor and the rotating speed sensor are respectively connected with the input ends of the two ECU electronic control units, and detected engine running data are transmitted to the two ECU electronic control units, so that the current running working condition of the engine is obtained. And the temperature and pressure sensors for air inlet and the temperature and pressure sensors for exhaust transmit the acquired temperature and pressure signals to the two ECU electronic control units respectively, and the ECU electronic control units are used for detecting the current environmental conditions of the engine.
The dual-ECU control is adopted, the ECU judges the working environment and the running condition of the current engine according to the data transmitted by each sensor, flexibly switches different combustion modes by respectively controlling two sets of methanol and diesel injection systems according to different performance requirements of the engine on the current state, makes injection strategies such as injection quantity, injection time and the like of two kinds of fuel, transmits related control signals to the oil injectors 5 and 6, and accurately controls the injection of the two kinds of fuel. The dual-fuel homogeneous compression combustion mode is mainly adopted.
A control method of a dual-fuel intelligent combustion system adopts a pure diesel oil working mode during cold start to ensure stable combustion and normal start.
When the engine runs in a low-speed and low-load working condition, namely the speed is in the range of 800rpm-1200rpm, PmeWhen the pressure is less than 0.3MPa, the methanol oil injector and the diesel oil injector are respectively controlled by the two ECU, the methanol fuel is injected in the air intake stroke, homogeneous premixed gas is formed in the cylinder, the diesel oil fuel is injected later than the methanol fuel in the air intake stroke, the methanol fuel is ignited, the fuel economy is ensured, and the emission is reduced.
When the engine runs in the working condition of low rotating speed and high load, namely the rotating speed is in the range of 800rpm-1200rpm, and P is more than 0.3MPameWhen the pressure is less than 1MPa, a pure diesel oil working mode is adopted,the stability of combustion is ensured, and knocking is inhibited.
When the engine operates in a medium-speed working condition, namely the speed is in a range of 1200rpm-1800rpm, the methanol fuel injector and the diesel fuel injector are respectively controlled by the two ECU units, the methanol fuel and the diesel fuel are injected in the early stage of a compression stroke to form a homogeneous mixed gas, and the homogeneous mixed gas is ignited by spontaneous combustion when the piston is compressed to be near the top dead center, so that an HCCI combustion mode is realized.
When the engine runs in the high-speed low-load working condition, namely the speed is greater than 1800rpm, PmeWhen the pressure is less than 0.3MPa, the methanol fuel injector and the diesel fuel injector are respectively controlled by the two ECU units, the methanol fuel and the diesel fuel are injected in the early stage of a compression stroke to form a homogeneous mixed gas, and the homogeneous mixed gas is ignited by spontaneous combustion when a piston is compressed to be near the upper dead point, so that an HCCI combustion mode is realized.
When the engine runs in a high-speed and high-load working condition, namely the speed is more than 1800rpm, PmeWhen the pressure is more than 0.6MPa, a pure diesel oil working mode is adopted for inhibiting detonation and improving the heat efficiency.
Claims (3)
1. A dual-fuel intelligent combustion system is characterized in that: including cylinder body (1), cylinder cap (3), piston (2), methanol fuel sprayer (5), diesel oil sprayer (6) and ECU electrical unit, cylinder body (1), cylinder cap (3) and piston (2) form the combustion chamber, cylinder cap (3) set up directly over cylinder body (1), piston (2) set up in cylinder body (1), the combustion chamber is provided with intake duct (7) and exhaust passage (4), the combustion chamber in be provided with to the methanol fuel sprayer (5) of injecting the interior cylinder alcohol fuel and to the diesel oil sprayer (6) of injecting the pilot fuel diesel oil in the cylinder, methanol fuel sprayer (5) and diesel oil sprayer (6) are controlled respectively through two ECU electrical unit.
2. The dual fuel smart combustion system of claim 1, wherein: the top surface of the piston (2) is eccentrically provided with a omega-shaped pit, the methanol fuel injector (5) is obliquely arranged right above the center of the omega-shaped pit, the included angle between the central axis of the methanol fuel injector (5) and the central axis of the cylinder is 0-10 degrees, the diesel fuel injector (6) is obliquely arranged above the omega-shaped pit and is not coincident with the methanol fuel injector, and the included angle between the central axis of the diesel fuel injector (6) and the central axis of the cylinder is 10-25 degrees.
3. The dual fuel smart combustion system of claim 2, wherein: the input ends of the two ECU electric control units are respectively connected with a cylinder pressure sensor, a crankshaft position sensor and a camshaft sensor, the cylinder pressure sensor is installed on a cylinder cover, the crankshaft position sensor is installed on a machine body and close to a flywheel disc, and the camshaft sensor is installed on the machine body and close to a camshaft.
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| CN202121484075.3U CN214944586U (en) | 2021-07-01 | 2021-07-01 | Dual-fuel intelligent combustion system |
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| CN202121484075.3U CN214944586U (en) | 2021-07-01 | 2021-07-01 | Dual-fuel intelligent combustion system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374575A (en) * | 2021-07-01 | 2021-09-10 | 太原理工大学 | Dual-fuel intelligent combustion system and control method thereof |
| CN114576052A (en) * | 2022-02-17 | 2022-06-03 | 天津大学 | Control method of methanol fuel engine |
| WO2023247901A1 (en) | 2022-06-23 | 2023-12-28 | Veryone | Methanol-based engine fuel containing a combustion-enhancing additive |
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2021
- 2021-07-01 CN CN202121484075.3U patent/CN214944586U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374575A (en) * | 2021-07-01 | 2021-09-10 | 太原理工大学 | Dual-fuel intelligent combustion system and control method thereof |
| WO2023274184A1 (en) * | 2021-07-01 | 2023-01-05 | 太原理工大学 | Dual-fuel intelligent combustion system and control method therefor |
| CN113374575B (en) * | 2021-07-01 | 2024-02-02 | 太原理工大学 | Dual-fuel intelligent combustion system and control method thereof |
| GB2623473A (en) * | 2021-07-01 | 2024-04-17 | Univ Taiyuan Technology | Dual-fuel intelligent combustion system and control method therefor |
| CN114576052A (en) * | 2022-02-17 | 2022-06-03 | 天津大学 | Control method of methanol fuel engine |
| CN114576052B (en) * | 2022-02-17 | 2023-10-03 | 天津大学 | Control method of methanol fuel engine |
| WO2023247901A1 (en) | 2022-06-23 | 2023-12-28 | Veryone | Methanol-based engine fuel containing a combustion-enhancing additive |
| FR3137104A1 (en) | 2022-06-23 | 2023-12-29 | Veryone | Methanol-based motor fuel containing a combustion improvement additive. |
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