CN118088359A - Diesel-butanol-PODE composite fuel supply system and fuel supply method - Google Patents
Diesel-butanol-PODE composite fuel supply system and fuel supply method Download PDFInfo
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- CN118088359A CN118088359A CN202410030481.4A CN202410030481A CN118088359A CN 118088359 A CN118088359 A CN 118088359A CN 202410030481 A CN202410030481 A CN 202410030481A CN 118088359 A CN118088359 A CN 118088359A
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- butanol
- pode
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- diesel
- fuel
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- 239000000446 fuel Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 14
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 236
- 239000002283 diesel fuel Substances 0.000 claims abstract description 59
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 239000000498 cooling water Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims description 63
- 239000007924 injection Substances 0.000 claims description 63
- 230000006835 compression Effects 0.000 claims description 48
- 238000007906 compression Methods 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 230000001133 acceleration Effects 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- -1 Polyoxymethylene Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 150000005218 dimethyl ethers Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a diesel oil-butanol-PODE composite fuel supply system and a fuel supply method, comprising a diesel oil supply loop, a PODE supply loop and a butanol supply loop; the system also comprises an electric control system; the control method comprises the following steps: judging the starting temperature according to the temperature of the cooling water, and controlling the working condition of the supply system according to the starting temperature; judging whether warming-up is needed according to the temperature of the cooling water after the engine is started; judging whether power output is needed according to the accelerator pedal signal, and meeting different requirements for fuel under different working conditions; according to the invention, different proportions and different types of fuel/fuel combinations can be used according to different using areas and working conditions of the engine, so that unreasonable use under the condition of fixed proportion is avoided; the flexible supply of the three fuels can realize different combustion modes and control strategies, realize the purposes of energy conservation and emission reduction, improve the starting and working stability of the engine and other performances, and reduce the high-pressure common rail pressure and the complexity of the post-treatment equipment.
Description
Technical Field
The invention relates to the field of control and fuel supply of internal combustion engines, in particular to a diesel-butanol-PODE composite fuel supply system and a fuel supply method.
Background
The development of coal-based alternative fuels and the development of new combustion technologies have become a focus of research in recent years. Butanol with high octane number and polymethoxy dimethyl ether (Polyoxymethylene DIMETHYL ETHERS, PODE) with high cetane number belong to coal-based fuels with high oxygen content, and different combustion modes can be realized by different combinations of the butanol with diesel under different working conditions, so that the method has important practical significance for energy conservation and emission reduction of the internal combustion engine.
The Chinese patent with the application publication number of CN101078376 discloses a method for mixing automobile gasoline and alcohols, a fuel supply system and a controller, and discloses a concept of adjusting the fuel injection quantity of an engine according to the working condition set by a main controller when the idle load changes. When the engine is separated from the idle speed, the oil injection quantity of the gasoline nozzle is locked at the oil injection quantity in the idle speed, the alcohol nozzle works according to the oil injection quantity set in the main controller, and the functions of accelerating, thickening, decelerating and fuel cut-off are reserved. However, it does not relate to the control of the joint operation between the PODE-based coal-based fuel and the diesel oil or alcohols, and for this purpose, a diesel oil-butanol-PODE composite fuel supply system and a fuel supply method have been proposed.
Disclosure of Invention
The technical problem solved by the invention is that the prior art does not relate to a fuel supply method of an internal combustion engine during interaction between PODE coal-based fuel, alcohols and diesel oil, so that the problems of incomplete fuel combustion and low fuel utilization efficiency are solved.
In order to solve the technical problems, the invention adopts the following technical scheme: a diesel-butanol-PODE composite fuel supply system comprises a diesel supply loop, a PODE supply loop and a butanol supply loop;
the diesel fuel supply circuit includes: the diesel oil tank, the diesel oil filter element, the low-pressure oil pump, the oil-water separator, the high-pressure oil pump and the high-pressure common rail are connected in sequence, and the high-pressure common rail is connected to the mixer through the diesel oil electromagnetic valve;
The PODE supply circuit includes: the PODE high-pressure common rail is connected to the mixer through a PODE electromagnetic valve;
the mixer is connected with the direct injection fuel injector and then led into an engine cylinder;
The butanol supply circuit includes: the butanol oil tank, the butanol filter element and the butanol pump are connected in sequence and are led into an engine cylinder through the butanol oil sprayer;
The engine also comprises an electric control system, wherein the electric control system comprises a water temperature sensor, a crank shaft sensor and an oxygen sensor which are arranged on the engine; the water temperature sensor, the crank shaft sensor and the oxygen sensor transmit cooling water temperature signals, crank shaft position/rotating speed signals and exhaust pipe oxygen concentration signals to the control system, and the control system feedback signals control the participation supply conditions of diesel oil, PODE fuel and butanol in the diesel oil supply loop, the PODE supply loop and the butanol supply loop.
The invention also provides a fuel supply method of the diesel-butanol-PODE composite fuel supply system, after the engine is electrified, the starting working condition is judged according to the temperature of cooling water, and the supply system is controlled to supply fuel according to different starting working conditions, so that the starting work of the engine is completed;
The judging method comprises the following steps:
when the temperature of the cooling water is less than the low temperature threshold TL, the engine is judged to be started at a low temperature;
when the low temperature threshold TL is smaller than the cooling water temperature and smaller than the high temperature threshold TH, the engine is judged to be started at normal temperature;
When the temperature of the cooling water is more than the high temperature threshold TH, judging that the temperature of the engine is high-temperature starting;
The control method of the supply system comprises the following steps:
When the engine is started at low temperature, a diesel oil supply loop and a PODE supply loop are started, and the operation of a mixer is controlled to stir diesel oil-PODE mixed fuel in the mixer, and a direct injection injector is used for injecting fuel into a cylinder for reference and combustion;
When the engine is started at normal temperature, starting a diesel oil supply loop, and spraying diesel oil into the cylinder to perform combustion through a direct injection oil sprayer at the end of a compression stroke;
When the engine is started at high temperature, the PODE supply loop and the butanol supply loop are started, a butanol injector is started in the compression stroke process, butanol is injected into the cylinder, and PODE fuel is injected into the cylinder through the direct injection injector at the end of the compression stroke to be compression-ignited.
Specifically, after the engine is started, judging whether the engine needs to be warmed up to idle according to the temperature of the cooling water, and controlling a supply system to supply fuel to complete the idle operation of the engine;
The judging method comprises the following steps:
When the cooling water temperature < idle water temperature TI, it is determined that the engine needs to be idle warmed up:
When the cooling water temperature > = idle water temperature TI, judging that the engine does not need to be warmed up, and directly entering an idle state;
The control method of the supply system comprises the following steps:
when idle speed warming is needed, starting a diesel oil supply loop and a PODE supply loop;
When idle speed warming is not needed, a diesel oil supply loop, a PODE supply loop and a butanol supply loop are started, a butanol injector is started in the compression stroke process, butanol is injected into the cylinder, a direct injection injector is started at the end of the compression stroke, and a diesel oil-PODE mixture is injected into the cylinder for compression ignition.
Particularly, judging a power output working condition according to an accelerator pedal signal, and controlling a supply system to supply fuel;
The control method of the supply system comprises the following steps:
When the engine is in an acceleration working condition, all three supply loops are adjusted to be in an open state, a butanol injector is opened in the compression stroke process, butanol is injected into the cylinder, and diesel-PODE mixed fuel is injected into the cylinder to be subjected to compression ignition at the end of the compression stroke;
When the engine is not in an acceleration working condition, judging whether the engine is in a low-load working condition according to the running acceleration, if the engine is in the low-load working condition, starting a butanol supply loop and a PODE supply loop, starting a butanol injector to inject butanol into a cylinder in the compression stroke process, and injecting PODE fuel into the cylinder by a direct injection injector at the end of the compression stroke for compression ignition;
When the engine is not in an acceleration working condition, judging whether the engine is in a low-load working condition according to the running acceleration, if not, starting a butanol supply loop and a diesel supply loop, starting a butanol injector in the compression stroke process, and injecting butanol into the cylinder; and opening the direct injection fuel injector at the end of the compression stroke to inject diesel fuel into the cylinder for compression ignition.
Specifically, the control system controls the opening degree and the injection time of the direct injection fuel injector or controls the opening degree and the injection time of the butanol fuel injector through the feedback signal of the electric control system, and controls the working state of the engine, the in-cylinder combustion state and the combustion mode.
Compared with the prior art, the invention has the following advantages and beneficial effects: the invention can store and add three fuels of diesel oil, butanol and PODE respectively, and avoid adverse effects of layering, degradation and the like; different proportions and different types of fuels/fuel combinations can be used according to different using areas and working conditions of the engine, so that unreasonable use under the condition of fixed proportion is avoided; the flexible supply of the three fuels can realize different combustion modes and control strategies and realize the purposes of energy conservation and emission reduction; the addition of the oxygen-containing fuel and the PODE can improve the starting and working stability of the engine and reduce the high-pressure common rail pressure and the complexity of the post-treatment equipment.
Drawings
FIG. 1 is a schematic diagram of a supply system according to the present invention.
FIG. 2 is a block diagram of a method for controlling a start-up condition feed system.
FIG. 3 is a block diagram of a warm-up and idle condition supply system control method.
FIG. 4 is a block diagram of a control method of the power take-off condition delivery system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept of the present invention, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought thereby.
As shown in fig. 1 to 4, the diesel-butanol-PODE composite fuel supply system of the present invention includes a diesel supply circuit, a PODE supply circuit, and a butanol supply circuit;
the diesel fuel supply circuit includes: the diesel oil tank, the diesel oil filter element, the low-pressure oil pump, the oil-water separator, the high-pressure oil pump and the high-pressure common rail are connected in sequence, and the high-pressure common rail is connected to the mixer through the diesel oil electromagnetic valve;
The PODE supply circuit includes: the PODE high-pressure common rail is connected to the mixer through a PODE electromagnetic valve;
the mixer is connected with the direct injection fuel injector and then led into an engine cylinder;
The butanol supply circuit includes: the butanol oil tank, the butanol filter element and the butanol pump are connected in sequence and are led into an engine cylinder through the butanol oil sprayer;
The engine also comprises an electric control system, wherein the electric control system comprises a water temperature sensor, a crank shaft sensor and an oxygen sensor which are arranged on the engine; the water temperature sensor, the crank shaft sensor and the oxygen sensor transmit cooling water temperature signals, crank shaft position/rotating speed signals and exhaust pipe oxygen concentration signals to the control system, and the control system feedback signals control the participation supply conditions of diesel oil, PODE fuel and butanol in the diesel oil supply loop, the PODE supply loop and the butanol supply loop.
The invention relates to a fuel supply method of a diesel oil-butanol-PODE composite fuel supply system, which comprises the following steps:
1. The engine is electrified, whether the engine is started at low temperature, normal temperature and high temperature is judged according to the temperature of the cooling water, the supply system is controlled to work according to different starting working conditions, and the starting work of the engine is completed:
1. When the cooling water temperature is less than the low temperature threshold TL, it is determined that the engine is started at a low temperature:
A. At the moment, a diesel low-pressure pump, a diesel electromagnetic valve, a diesel high-pressure pump, a PODE low-pressure pump, a PODE electromagnetic valve, a PODE high-pressure pump and a mixer are required to be started simultaneously;
B. Diesel in the diesel tank sequentially passes through the diesel filter element, the low-pressure oil pump and the oil-water separator and then enters the high-pressure oil pump for pressurization;
C. diesel oil pressurized by the high-pressure oil pump sequentially enters the high-pressure common rail, the diesel oil electromagnetic valve and the mixer;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. The PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve and the mixer;
F. The control system controls the quantity of diesel oil entering the mixer by controlling the opening of the diesel oil electromagnetic valve and the PODE electromagnetic valve, so as to control the respective proportion of the diesel oil-PODE mixture in the mixer;
G. Stirring the diesel-PODE mixture in the mixer by controlling the operation of a motor in the mixer to fully mix the diesel-PODE mixture;
H. the mixed diesel-PODE fuel in the mixer is sprayed into the cylinder by a direct-injection injector to be burnt;
I. the control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the direct injection fuel injector;
J. In the whole process, the control system continuously adjusts the working states of the diesel electromagnetic valve, the PODE electromagnetic valve and the direct injection fuel injector to ensure that the fuel economy and the emission performance in the starting working condition are always in the optimal state.
2. When the low temperature threshold TL < the cooling water temperature < the high temperature threshold TH), the engine is judged to be started at normal temperature:
A. At this time, a diesel low-pressure pump, a diesel electromagnetic valve and a diesel high-pressure pump are required to be started;
B. Diesel in the diesel tank sequentially passes through the diesel filter element, the low-pressure oil pump and the oil-water separator and then enters the high-pressure oil pump for pressurization;
C. diesel oil pressurized by the high-pressure oil pump sequentially enters the high-pressure common rail, the diesel oil electromagnetic valve, the mixer and the direct injection nozzle;
D. The direct injection fuel injector injects diesel fuel into the cylinder at the end of the compression stroke, the diesel fuel is compression-ignited, and the engine starts to do work;
E. The control system controls the diesel electromagnetic valve to be fully opened;
F. The control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the direct injection fuel injector;
G. in the whole process, the control system continuously adjusts the working state of the direct injection fuel injector to ensure that the fuel economy and the emission performance in the starting working condition are always in the optimal state.
3. When the cooling water temperature > the high temperature threshold TH, it is determined that the engine is started at a high temperature:
A. at the moment, a butanol pump, a butanol oil sprayer, a PODE low-pressure pump, a PODE electromagnetic valve and a PODE high-pressure pump are required to be started simultaneously;
B. butanol in the butanol oil tank sequentially passes through the butanol filter element and the butanol pump and then enters the butanol oil sprayer;
C. Opening a butanol injector during a compression stroke to inject butanol into the cylinder;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. the PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve, the mixer and the direct injection nozzle;
F. At the end of the compression stroke, the direct injection injector injects PODE into the cylinder to be compression ignited;
G. The compression ignition PODE ignites butanol and the engine begins to do work;
H. The control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the butanol injector and the direct injection injector;
I. In the whole process, the control system enables the fuel economy and the emission performance in the starting working condition to be always in the optimal state by continuously adjusting the working states of the butanol injector and the direct injection injector.
2. After the engine is started, judging whether the engine needs to be warmed up to idle according to the temperature of the cooling water, controlling a supply system to supply fuel, and finishing the idle operation of the engine by working:
1. when the cooling water temperature < idle water temperature TI, it is determined that the engine needs to be idle warmed up:
A. At the moment, a diesel low-pressure pump, a diesel electromagnetic valve, a diesel high-pressure pump, a PODE low-pressure pump, a PODE electromagnetic valve, a PODE high-pressure pump and a mixer are required to be started simultaneously;
B. Diesel in the diesel tank sequentially passes through the diesel filter element, the low-pressure oil pump and the oil-water separator and then enters the high-pressure oil pump for pressurization;
C. diesel oil pressurized by the high-pressure oil pump sequentially enters the high-pressure common rail, the diesel oil electromagnetic valve and the mixer;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. The PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve and the mixer;
F. The control system controls the quantity of diesel oil entering the mixer by controlling the opening of the diesel oil electromagnetic valve and the PODE electromagnetic valve, so as to control the respective proportion of the diesel oil-PODE mixture in the mixer;
G. Stirring the diesel-PODE mixture in the mixer by controlling the operation of a motor in the mixer to fully mix the diesel-PODE mixture;
H. the mixed diesel-PODE fuel in the mixer is sprayed into the cylinder by a direct-injection injector to be burnt;
I. the control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the direct injection fuel injector;
J. In the whole process, the control system continuously adjusts the working states of the diesel electromagnetic valve, the PODE electromagnetic valve and the direct injection fuel injector to ensure that the fuel economy and the emission performance in the idle speed warming working condition are always in the optimal states.
2. When cooling water temperature > = idle water temperature TI, it is determined that the engine does not need to be warmed up, and the engine directly enters an idle state:
A. At the moment, a diesel low-pressure pump, a diesel electromagnetic valve, a diesel high-pressure pump, a PODE low-pressure pump, a PODE electromagnetic valve, a PODE high-pressure pump, a mixer, a butanol pump and a butanol injector are required to be started simultaneously;
B. Diesel in the diesel tank sequentially passes through the diesel filter element, the low-pressure oil pump and the oil-water separator and then enters the high-pressure oil pump for pressurization;
C. diesel oil pressurized by the high-pressure oil pump sequentially enters the high-pressure common rail, the diesel oil electromagnetic valve and the mixer;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. The PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve and the mixer;
F. Butanol in the butanol oil tank sequentially passes through the butanol filter element and the butanol pump and then enters the butanol oil sprayer;
G. the control system controls the quantity of diesel oil entering the mixer by controlling the opening of the diesel oil electromagnetic valve and the PODE electromagnetic valve, so as to control the respective proportion of the diesel oil-PODE mixture in the mixer;
H. stirring the diesel-PODE mixture in the mixer by controlling the operation of a motor in the mixer to fully mix the diesel-PODE mixture;
I. the mixed diesel-PODE fuel in the mixer is sprayed into the cylinder by a direct-injection injector to be burnt;
J. opening a butanol injector during a compression stroke to inject butanol into the cylinder;
K. At the end of the compression stroke, the direct injection injector injects the diesel-PODE mixed fuel into the cylinder to be compression-ignited;
L, diesel-PODE of compression ignition ignites butanol, the engine begins to do work;
M, the control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the direct injection fuel injector and the butanol fuel injector;
And N, continuously adjusting the working states of the diesel electromagnetic valve, the PODE electromagnetic valve, the direct injection fuel injector and the butanol fuel injector by the control system in the whole process, so that the fuel economy and the emission performance in the idle working condition are always in the optimal state.
3. Judging whether the engine needs power output according to the accelerator pedal signal, and controlling the supply system to work so as to adapt to different requirements of fuel under different working conditions:
1. when the engine is in an acceleration condition:
A. At the moment, a diesel low-pressure pump, a diesel electromagnetic valve, a diesel high-pressure pump, a PODE low-pressure pump, a PODE electromagnetic valve, a PODE high-pressure pump, a mixer, a butanol pump and a butanol injector are required to be started simultaneously;
B. Diesel in the diesel tank sequentially passes through the diesel filter element, the low-pressure oil pump and the oil-water separator and then enters the high-pressure oil pump for pressurization;
C. diesel oil pressurized by the high-pressure oil pump sequentially enters the high-pressure common rail, the diesel oil electromagnetic valve and the mixer;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. The PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve and the mixer;
F. Butanol in the butanol oil tank sequentially passes through the butanol filter element and the butanol pump and then enters the butanol oil sprayer;
G. the control system controls the quantity of diesel oil entering the mixer by controlling the opening of the diesel oil electromagnetic valve and the PODE electromagnetic valve, so as to control the respective proportion of the diesel oil-PODE mixture in the mixer;
H. stirring the diesel-PODE mixture in the mixer by controlling the operation of a motor in the mixer to fully mix the diesel-PODE mixture;
I. the mixed diesel-PODE fuel in the mixer is sprayed into the cylinder by a direct-injection injector to be burnt;
J. opening a butanol injector during a compression stroke to inject butanol into the cylinder;
K. At the end of the compression stroke, the direct injection injector injects the diesel-PODE mixed fuel into the cylinder to be compression-ignited;
L, diesel-PODE of compression ignition ignites butanol, the engine begins to do work;
M, the control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the direct injection fuel injector and the butanol fuel injector;
and N, continuously adjusting the working states of the diesel electromagnetic valve, the PODE electromagnetic valve, the direct injection fuel injector and the butanol fuel injector by the control system in the whole process, so that the fuel economy and the emission performance in the acceleration working condition are always in the optimal state.
2. If the engine is not in the acceleration working condition, judging whether the engine is in the low-load working condition, and if the engine is in the low-load working condition:
A. at the moment, a butanol pump, a butanol oil sprayer, a PODE low-pressure pump, a PODE electromagnetic valve and a PODE high-pressure pump are required to be started simultaneously;
B. butanol in the butanol oil tank sequentially passes through the butanol filter element and the butanol pump and then enters the butanol oil sprayer;
C. Opening a butanol injector during a compression stroke to inject butanol into the cylinder;
D. the PODE in the PODE oil tank sequentially passes through a PODE filter element, a PODE low-pressure pump and a PODE oil-water separator and then enters a PODE high-pressure pump for pressurization;
E. the PODE pressurized by the PODE high-pressure pump sequentially enters the PODE high-pressure common rail, the PODE electromagnetic valve, the mixer and the direct injection nozzle;
F. At the end of the compression stroke, the direct injection injector injects PODE into the cylinder to be compression ignited;
G. The compression ignition PODE ignites butanol and the engine begins to do work;
H. The control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the butanol injector and the direct injection injector;
I. In the whole process, the control system enables the fuel economy and the emission performance in the low-load working condition to be always in the optimal state by continuously adjusting the working states of the butanol injector and the direct injection injector.
3. If the working condition is medium/heavy load working condition:
A. at the moment, a butanol pump, a butanol oil sprayer, a diesel low-pressure pump, a diesel electromagnetic valve and a diesel high-pressure pump are required to be started simultaneously;
B. butanol in the butanol oil tank sequentially passes through the butanol filter element and the butanol pump and then enters the butanol oil sprayer;
C. Opening a butanol injector during a compression stroke to inject butanol into the cylinder;
D. diesel in the diesel tank sequentially passes through a diesel filter element, a diesel low-pressure pump and a diesel oil-water separator and then enters a diesel high-pressure pump for pressurization;
E. The diesel oil pressurized by the diesel oil high-pressure pump sequentially enters the diesel oil high-pressure common rail, the diesel oil electromagnetic valve, the mixer and the direct injection nozzle;
F. at the end of the compression stroke, the direct injection injector injects diesel oil into the cylinder to be compression-ignited;
G. the compression ignition diesel ignites butanol, and the engine begins to do work;
H. The control system controls the working state of the engine, the in-cylinder combustion state and the combustion mode by controlling the opening degree and the injection time of the butanol injector and the direct injection injector;
I. In the whole process, the control system enables the fuel economy and the emission performance in the starting working condition to be always in the optimal state by continuously adjusting the working states of the butanol injector and the direct injection injector.
The terms "connected" and "fixed" used in the description of the present invention may be fixed, formed, welded, or mechanically connected, and the specific meaning of the terms in the present invention is understood in specific cases.
In the description of the present invention, the terms "center," "upper," "lower," "horizontal," "inner," "outer," and the like are used merely for convenience in describing the present invention and to simplify the description, and do not denote or imply a particular orientation that the device or element in question must have, and thus should not be construed as limiting the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The diesel-butanol-PODE composite fuel supply system is characterized by comprising a diesel supply loop, a PODE supply loop and a butanol supply loop;
the diesel fuel supply circuit includes: the diesel oil tank, the diesel oil filter element, the low-pressure oil pump, the oil-water separator, the high-pressure oil pump and the high-pressure common rail are connected in sequence, and the high-pressure common rail is connected to the mixer through the diesel oil electromagnetic valve;
The PODE supply circuit includes: the PODE high-pressure common rail is connected to the mixer through a PODE electromagnetic valve;
the mixer is connected with the direct injection fuel injector and then led into an engine cylinder;
The butanol supply circuit includes: the butanol oil tank, the butanol filter element and the butanol pump are connected in sequence and are led into an engine cylinder through the butanol oil sprayer;
The engine also comprises an electric control system, wherein the electric control system comprises a water temperature sensor, a crank shaft sensor and an oxygen sensor which are arranged on the engine; the water temperature sensor, the crank shaft sensor and the oxygen sensor transmit cooling water temperature signals, crank shaft position/rotating speed signals and exhaust pipe oxygen concentration signals to the control system, and the control system feedback signals control the participation supply conditions of diesel oil, PODE fuel and butanol in the diesel oil supply loop, the PODE supply loop and the butanol supply loop.
2. The fuel supply method of a diesel-butanol-PODE composite fuel supply system according to claim 1, wherein after the engine is powered on, the start-up condition is judged according to the temperature of the cooling water, and the supply system is controlled to supply fuel according to different start-up conditions to complete the engine start-up operation;
The judging method comprises the following steps:
when the temperature of the cooling water is less than the low temperature threshold TL, the engine is judged to be started at a low temperature;
when the low temperature threshold TL is smaller than the cooling water temperature and smaller than the high temperature threshold TH, the engine is judged to be started at normal temperature;
When the temperature of the cooling water is more than the high temperature threshold TH, judging that the temperature of the engine is high-temperature starting;
The control method of the supply system comprises the following steps:
When the engine is started at low temperature, a diesel oil supply loop and a PODE supply loop are started, and the operation of a mixer is controlled to stir diesel oil-PODE mixed fuel in the mixer, and a direct injection injector is used for injecting fuel into a cylinder for reference and combustion;
When the engine is started at normal temperature, starting a diesel oil supply loop, and spraying diesel oil into the cylinder to perform combustion through a direct injection oil sprayer at the end of a compression stroke;
When the engine is started at high temperature, the PODE supply loop and the butanol supply loop are started, a butanol injector is started in the compression stroke process, butanol is injected into the cylinder, and PODE fuel is injected into the cylinder through the direct injection injector at the end of the compression stroke to be compression-ignited.
3. The fuel supply method of a diesel-butanol-PODE composite fuel supply system according to claim 1, wherein after the engine is started, determining whether a warm-up idle speed is required according to the cooling water temperature, and controlling the supply system to supply fuel to complete an idle operation of the engine;
The judging method comprises the following steps:
When the cooling water temperature < idle water temperature TI, it is determined that the engine needs to be idle warmed up:
When the cooling water temperature > = idle water temperature TI, judging that the engine does not need to be warmed up, and directly entering an idle state;
The control method of the supply system comprises the following steps:
when idle speed warming is needed, starting a diesel oil supply loop and a PODE supply loop;
When idle speed warming is not needed, a diesel oil supply loop, a PODE supply loop and a butanol supply loop are started, a butanol injector is started in the compression stroke process, butanol is injected into the cylinder, a direct injection injector is started at the end of the compression stroke, and a diesel oil-PODE mixture is injected into the cylinder for compression ignition.
4. The fuel supply method of a diesel-butanol-PODE composite fuel supply system according to claim 1, wherein the power output condition is determined based on an accelerator pedal signal, and the supply system is controlled to supply fuel;
The control method of the supply system comprises the following steps:
When the engine is in an acceleration working condition, all three supply loops are adjusted to be in an open state, a butanol injector is opened in the compression stroke process, butanol is injected into the cylinder, and diesel-PODE mixed fuel is injected into the cylinder to be subjected to compression ignition at the end of the compression stroke;
When the engine is not in an acceleration working condition, judging whether the engine is in a low-load working condition according to the running acceleration, if the engine is in the low-load working condition, starting a butanol supply loop and a PODE supply loop, starting a butanol injector to inject butanol into a cylinder in the compression stroke process, and injecting PODE fuel into the cylinder by a direct injection injector at the end of the compression stroke for compression ignition;
When the engine is not in an acceleration working condition, judging whether the engine is in a low-load working condition according to the running acceleration, if not, starting a butanol supply loop and a diesel supply loop, starting a butanol injector in the compression stroke process, and injecting butanol into the cylinder; and opening the direct injection fuel injector at the end of the compression stroke to inject diesel fuel into the cylinder for compression ignition.
5. The fuel supply method of a diesel-butanol-PODE composite fuel supply system according to claim 1, wherein the control system controls the opening degree and the injection timing of the direct injection injector or controls the opening degree and the injection timing of the butanol injector by an electric control system feedback signal, and controls the engine operating state and the in-cylinder combustion state and the combustion mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311090058 | 2023-08-28 | ||
| CN2023110900585 | 2023-08-28 |
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| Publication Number | Publication Date |
|---|---|
| CN118088359A true CN118088359A (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410030481.4A Pending CN118088359A (en) | 2023-08-28 | 2024-04-26 | Diesel-butanol-PODE composite fuel supply system and fuel supply method |
Country Status (1)
| Country | Link |
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| CN (1) | CN118088359A (en) |
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- 2024-04-26 CN CN202410030481.4A patent/CN118088359A/en active Pending
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