CN106930849B - Dual-fuel engine combustion mode switching control method and system and vehicle - Google Patents

Dual-fuel engine combustion mode switching control method and system and vehicle Download PDF

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Publication number
CN106930849B
CN106930849B CN201511009762.9A CN201511009762A CN106930849B CN 106930849 B CN106930849 B CN 106930849B CN 201511009762 A CN201511009762 A CN 201511009762A CN 106930849 B CN106930849 B CN 106930849B
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combustion mode
dual
fuel engine
diesel
ignition
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CN106930849A (en
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崔亚彬
王帅
赵伟博
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F02B37/025—Multiple scrolls or multiple gas passages guiding the gas to the pump drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/20—Control of the pumps by increasing exhaust energy, e.g. using combustion chamber by after-burning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/032—Producing and adding steam
    • F02M25/035—Producing and adding steam into the charge intakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • 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

Abstract

The invention provides a method, a system and a vehicle for controlling the switching of combustion modes of a dual-fuel engine, wherein the method comprises the following steps: controlling a spark plug of the dual-fuel engine to stop ignition when switching from the first combustion mode to the second combustion mode; when the second combustion mode is switched to the third combustion mode, a preset amount of diesel oil is supplied in a mode of direct in-cylinder injection, and the supply amount of gasoline is correspondingly reduced; when the third combustion mode is switched to the fourth combustion mode, the supply amount of diesel oil is gradually increased, the supply amount of gasoline is gradually reduced, and the post-injection phase of the diesel oil is gradually shifted from the first phase to the second phase. The method of the invention not only can improve the heat efficiency of the engine, but also can improve the smoothness of the vehicle.

Description

Dual-fuel engine combustion mode switching control method and system and vehicle
Technical Field
The invention relates to the technical field of automobiles, in particular to a switching control method and system for combustion modes of a dual-fuel engine and a vehicle.
Background
The dual-fuel engine, such as the dual-fuel engine of gasoline and diesel oil, has the advantage of low exhaust pollutant emission compared with the traditional diesel engine, and has the advantage of high fuel economy compared with the traditional gasoline engine. At present, in order to further improve the thermal efficiency, a dual-fuel engine generally has a plurality of working modes, so that the dual-fuel engine can work with different fuels or different ignition modes under different load conditions.
However, during the switching of each operation mode, since the fuel work of each operation mode is generally different, power variation and torque fluctuation are often generated, which undoubtedly affects the smoothness of the vehicle.
Disclosure of Invention
In view of this, the present invention is directed to a method for controlling switching of combustion modes of a dual-fuel engine, which can not only improve the thermal efficiency of the engine, but also improve the smoothness of the vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a switching control method for combustion modes of a dual-fuel engine comprises the following steps: controlling a spark plug of the dual-fuel engine to stop ignition when switching from the first combustion mode to the second combustion mode; when the second combustion mode is switched to the third combustion mode, supplying a preset amount of diesel oil in a mode of direct in-cylinder injection, and correspondingly reducing the supply amount of gasoline; when the third combustion mode is switched to the fourth combustion mode, the supply amount of diesel oil is gradually increased, the supply amount of gasoline is gradually reduced, and the post-injection phase of the diesel oil is gradually shifted forward from the first phase to the second phase.
Further, the method further comprises: controlling an EGR (Exhaust Gas Recirculation) valve of the dual-fuel engine to open and an Exhaust valve of the dual-fuel engine to open for a second time and controlling a throttle valve of the dual-fuel engine to open to a maximum opening degree with a first slope when switching from the first combustion mode to the second combustion mode, wherein the first slope is set according to the rotating speed and the torque of the dual-fuel engine; when the second combustion mode is switched to the third combustion mode, adjusting the opening degree of the throttle valve according to the rotating speed and the torque of the dual-fuel engine, and controlling the opening or closing of the EGR valve and the secondary opening or secondary closing of the exhaust valve according to the rotating speed and the torque of the dual-fuel engine; controlling the exhaust valve to close twice when switching from the third combustion mode to the fourth combustion mode.
Further, in the first combustion mode, the load of the dual-fuel engine is adjusted by controlling the opening degree of the throttle valve.
Further, the preset amount of the diesel oil is 2-4 mg.
Further, the first phase is 25-35 ℃ A after top dead center, and the second phase is 15-25 ℃ A before top dead center.
Compared with the prior art, the switching control method for the combustion mode of the dual-fuel engine has the following advantages:
the switching control method of the combustion mode of the dual-fuel engine can switch the combustion mode, so that the advantages of different types of fuels and different oil supply and ignition modes can be fully exerted, the heat efficiency of the engine can be improved, meanwhile, in the switching process of the combustion mode, smooth transition among the combustion modes can be realized by controlling the fuel supply quantity and the supply time, the power change and the torque fluctuation during switching of the combustion mode are reduced, and the smoothness of a vehicle can be improved.
Another objective of the present invention is to provide a control system for switching combustion modes of a dual-fuel engine, which can not only improve the thermal efficiency of the engine, but also improve the smoothness of the vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a switching control system of combustion modes of a dual fuel engine, comprising: a dual fuel engine including a gasoline injector, a diesel injector, and a spark plug; and a controller configured to control the ignition plug to stop ignition when the first combustion mode is switched to the second combustion mode, control the diesel injector to supply a predetermined amount of diesel fuel by in-cylinder direct injection and control the gasoline injector to reduce a supply amount of gasoline in response to switching of the second combustion mode to the third combustion mode, and control the diesel injector to gradually increase the supply amount of diesel fuel and control the gasoline injector to gradually reduce the supply amount of gasoline when the third combustion mode is switched to the fourth combustion mode, and control the diesel injector to gradually advance a post-injection phase of diesel fuel from a first phase to a second phase.
Further, the dual fuel engine further includes an EGR valve, an exhaust valve, and a throttle valve, and the controller is further configured to: controlling the EGR valve to open and the exhaust valve to open twice and controlling the throttle valve to open to a maximum opening degree with a first slope at the time of switching from the first combustion mode to the second combustion mode, wherein the first slope is set according to the rotation speed and torque of the dual-fuel engine; when the second combustion mode is switched to the third combustion mode, adjusting the opening degree of the throttle valve according to the rotating speed and the torque of the dual-fuel engine, and controlling the opening or closing of the EGR valve and the secondary opening or secondary closing of the exhaust valve according to the rotating speed and the torque of the dual-fuel engine; controlling the exhaust valve to close twice when switching from the third combustion mode to the fourth combustion mode.
Further, the preset amount of the diesel oil is 2-4 mg.
Further, the first phase is 25-35 ℃ A after top dead center, and the second phase is 15-25 ℃ A before top dead center.
Compared with the prior art, the dual-fuel engine combustion mode switching control system and the dual-fuel engine combustion mode switching control method have the same advantages, and are not repeated herein.
Another object of the present invention is to provide a vehicle that not only has high thermal efficiency of the engine, but also improves the ride comfort.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle is provided with the switching control system of the combustion mode of the dual-fuel engine according to the embodiment.
Compared with the prior art, the vehicle and the dual-fuel engine combustion mode switching control system have the same advantages, and the detailed description is omitted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and are not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a control method for switching combustion modes of a dual-fuel engine according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cylinder head of a dual fuel engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a division of the combustion mode of a dual fuel engine according to an embodiment of the present invention;
fig. 4 is a block diagram of a control system for switching combustion modes of a dual-fuel engine according to an embodiment of the present invention.
Description of reference numerals:
400-switching control system of combustion mode of dual-fuel engine, 410-dual-fuel engine block, 420-controller, 330-control module, 411-gasoline injector, 412-diesel injector, 413-spark plug.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a flowchart of a control method for switching combustion modes of a dual fuel engine according to one embodiment of the present invention.
In the following description, the dual fuel engine refers to a dual fuel engine of both gasoline and diesel fuel. Fig. 2 is a schematic structural diagram of a dual fuel engine cylinder head according to one embodiment of the present invention. As shown in fig. 2, two gasoline injectors may be used for air passage injection and in-cylinder direct injection of gasoline, respectively, a diesel injector may be used for in-cylinder direct injection of diesel, and a spark plug may be used for spark ignition.
In the embodiment of the invention, the combustion modes may include first to fourth combustion modes in which the fuel type, the fuel supply manner, and the ignition manner are different. In the first combustion mode, gasoline is supplied in an air passage injection mode, and the ignition mode is spark ignition; in the second combustion mode, gasoline is supplied in a mixed injection mode, and the ignition mode is compression ignition; in a third combustion mode, gasoline is supplied in an air passage injection mode, diesel oil is supplied in an in-cylinder direct injection mode, and the ignition mode is that the gasoline is ignited by the compression-ignited diesel oil; in the fourth combustion mode, diesel fuel is supplied by in-cylinder direct injection, and the ignition method is compression ignition. In which combustion mode the dual fuel engine is operating may depend on its speed and torque, i.e. on the load of the dual fuel engine. The general relationship of combustion mode and speed and torque of a dual fuel engine may be with reference to FIG. 3. Since the parameters and performance of each dual fuel engine differ, it is not convenient to give specific values for speed and torque in the above relationship.
As shown in fig. 1, the method for controlling switching of the combustion mode of the dual-fuel engine according to one embodiment of the present invention includes the steps of:
s101: and controlling a spark plug of the dual-fuel engine to stop ignition when the first combustion mode is switched to the second combustion mode.
In one embodiment of the invention, the dual fuel engine may be started by spark ignition of gasoline, and during idle operation after successful start, the dual fuel engine may operate in the first combustion mode. In the first combustion mode, the load of the dual-fuel engine may be adjusted by controlling the opening of the throttle valve of the dual-fuel engine. In the first combustion mode, the equivalence ratio combustion can be achieved when the dual-fuel engine is idling, and the greater the load on the dual-fuel engine, the greater the opening degree of the throttle valve required.
To effect the switch to the second combustion mode, a spark plug of the dual-fuel engine may be controlled to stop firing. If the dual fuel engine is a multi-cylinder engine, the firing may be stopped in sequence as the cylinders fire.
In the embodiment of the invention, in the second combustion mode, when the load of the dual-fuel engine is relatively low, the homogeneous mixed gas can be generated by means of air passage injection, and when the piston in the compression stroke is positioned at the top dead center, a fuel-rich area is formed by means of in-cylinder direct injection, so that lean stratified compression ignition of the mixed gas is realized, wherein the quantity of gasoline provided by the air passage injection and the in-cylinder direct injection can be different according to different loads. When the load of the dual fuel engine rises so as to switch to the third combustion mode, compression ignition may be triggered by spark ignition with a spark plug based on the above-described fueling manner.
In the second combustion mode, the load of the dual fuel engine can be controlled by the supply amount of fuel alone. Thus, the relevant control for the throttle valve may be used only to control the EGR rate. Specifically, when switching from the first combustion mode to the second combustion mode, the EGR valve of the dual-fuel engine may be controlled to open, and the exhaust valve of the dual-fuel engine may be controlled to open twice, and the throttle valve of the dual-fuel engine may be controlled to open to a maximum opening degree with a first slope, wherein the first slope may be set according to the rotation speed and torque of the dual-fuel engine. It should be understood that the exhaust valve is opened twice to realize exhaust gas backflow and reburning, and the first opening of the exhaust valve for discharging exhaust gas can be controlled according to the requirement of the dual-fuel engine, and only the control process of the second opening is described herein, and the related content of the first opening is not described herein. In one embodiment of the invention, a table of the speed and torque of the dual fuel engine versus the first slope may be stored in the engine controller for recall at any time. The preset opening and the relation table may be different according to different parameters and performances of the dual-fuel engine, and are not limited specifically herein. Therefore, the EGR rate of the dual-fuel engine can be improved by controlling the EGR valve, the exhaust valve and the throttle valve, the waste gas backflow combustion supporting is realized, and the emission performance of the dual-fuel engine can be improved.
It should be noted that the above-mentioned process of controlling the spark plug of the dual-fuel engine to stop ignition may be performed after the EGR valve of the dual-fuel engine is opened.
S102: when the second combustion mode is switched to the third combustion mode, a preset amount of diesel oil is supplied in a manner of direct in-cylinder injection, and accordingly, the supply amount of gasoline is reduced.
In one embodiment of the invention, the predetermined amount of diesel fuel may be 2-4 mg. The supplied diesel fuel can be used for compression combustion and after combustion the gasoline is ignited. Therefore, the diesel fuel should be supplied in such an amount that the entire gasoline can be ignited. Since diesel is not supplied in the second combustion mode, the amount of diesel supplied increases the amount of fuel, resulting in a change in torque of the dual fuel engine, and therefore, in an embodiment of the present invention, the amount of gasoline supplied may be decreased accordingly, such that the torque provided by the combustion of diesel and gasoline is the same as when no diesel is supplied.
In an embodiment of the present invention, if the dual fuel engine is a multi-cylinder engine, it may be sequentially switched to the third combustion mode in the order in which the respective cylinders are fired. For example, for a four-cylinder engine with an ignition sequence of 1-3-4-2, the combustion mode may be switched in the sequence of 1-3-4-2, while the spark plugs may be controlled to stop the ignition in the sequence described above.
In one embodiment of the present invention, when switching from the second combustion mode to the third combustion mode, the opening degree of the throttle valve may be adjusted according to the rotation speed and torque of the dual-fuel engine, and the opening or closing of the EGR valve and the secondary opening or secondary closing of the exhaust valve may be controlled according to the rotation speed and torque of the dual-fuel engine to increase the EGR rate of the dual-fuel engine.
In the third combustion mode, the supply amount of the gasoline is changed along with the change of the load, and the supply amount of the diesel oil is correspondingly changed, so that the compression ignition diesel oil can just ignite all the gasoline.
S103: when the third combustion mode is switched to the fourth combustion mode, the supply amount of diesel oil is gradually increased, the supply amount of gasoline is gradually reduced, and the post-injection phase of the diesel oil is gradually shifted from the first phase to the second phase.
In one embodiment of the present invention, when switching from the third combustion mode to the fourth combustion mode, the exhaust valve may be controlled to be closed first, and the supply amount of gasoline may be kept constant. As the load of the dual fuel engine increases, the post injection may be increased for the supply of diesel fuel on the basis of the main injection in the third combustion mode to gradually increase the supply amount of diesel fuel, and at the same time, the supply amount of gasoline may be gradually decreased until the supply of gasoline is stopped.
In embodiments of the invention, the first phase may be 25-35 ℃ A after top dead center and the second phase may be 15-25 ℃ A before top dead center. For example, during the gradual increase of the diesel fuel supply, the post-injection phase of the diesel fuel may gradually move forward from 30 ℃ A after the top dead center, and finally move to 20 ℃ A before the top dead center.
According to the switching control method of the combustion mode of the dual-fuel engine, the combustion mode can be switched, so that the advantages of different types of fuels and different oil supply and ignition modes can be fully exerted, the heat efficiency of the engine can be improved, meanwhile, in the switching process of the combustion mode, smooth transition among the combustion modes can be realized by controlling the fuel supply quantity and the supply time, the power change and the torque fluctuation during the switching of the combustion modes are reduced, and the smoothness of a vehicle can be improved.
In order to realize the embodiment, the invention further provides a switching control system of the combustion mode of the dual-fuel engine.
Fig. 4 is a block diagram of a switching control system of a combustion mode of a dual fuel engine according to an embodiment of the present invention.
As shown in fig. 4, the system 400 for controlling switching of combustion modes of a dual-fuel engine according to an embodiment of the present invention includes: a dual fuel engine 410 and a controller 420.
The dual fuel engine 410 may include, among other things, a gasoline injector 411, a diesel injector 412, and a spark plug 413. As shown in fig. 2, two gasoline injectors 411 may be used for port injection and in-cylinder direct injection of gasoline, respectively, a diesel injector 412 may be used for in-cylinder direct injection of diesel, and a spark plug 413 may be used for spark ignition.
In the embodiment of the invention, the combustion modes may include first to fourth combustion modes in which the fuel type, the fuel supply manner, and the ignition manner are different. In the first combustion mode, gasoline is supplied in an air passage injection mode, and the ignition mode is spark ignition; in the second combustion mode, gasoline is supplied in a mixed injection mode, and the ignition mode is compression ignition; in a third combustion mode, gasoline is supplied in an air passage injection mode, diesel oil is supplied in an in-cylinder direct injection mode, and the ignition mode is that the gasoline is ignited by the compression-ignited diesel oil; in the fourth combustion mode, diesel fuel is supplied by in-cylinder direct injection, and the ignition method is compression ignition.
The controller 420 is configured to control the ignition plug 413 to stop ignition when switching from the first combustion mode to the second combustion mode, control the diesel injector 412 to supply a preset amount of diesel oil by in-cylinder direct injection when switching from the second combustion mode to the third combustion mode, control the gasoline injector 411 to reduce the supply amount of gasoline accordingly, control the diesel injector 412 to gradually increase the supply amount of diesel oil and control the gasoline injector 411 to gradually reduce the supply amount of gasoline when switching from the third combustion mode to the fourth combustion mode, and control the diesel injector 412 to gradually shift the post-injection phase of diesel oil from the first phase to the second phase.
According to the switching control system of the combustion mode of the dual-fuel engine, the combustion mode can be switched, so that the advantages of different types of fuels and different oil supply and ignition modes can be fully exerted, the heat efficiency of the engine can be improved, meanwhile, in the switching process of the combustion mode, smooth transition among the combustion modes can be realized by controlling the fuel supply quantity and the supply time, the power change and the torque fluctuation during the switching of the combustion modes are reduced, and the smoothness of a vehicle can be improved.
In one embodiment of the invention, the dual fuel engine 410 may also include an EGR valve, an exhaust valve, and a throttle valve. The controller 420 may also be configured to: controlling the EGR valve to open and the exhaust valve to open twice and controlling the throttle valve to open to a maximum opening degree with a first slope at the time of switching from the first combustion mode to the second combustion mode, wherein the first slope is set according to the rotation speed and torque of the dual-fuel engine 410; adjusting the opening degree of a throttle valve according to the rotation speed and torque of the dual-fuel engine 410 when switching from the second combustion mode to the third combustion mode, and controlling the opening or closing of an EGR valve and the secondary opening or secondary closing of an exhaust valve according to the rotation speed and torque of the dual-fuel engine; when the third combustion mode is switched to the fourth combustion mode, the exhaust valve is controlled to close twice.
In one embodiment of the invention, the predetermined amount of diesel fuel is 2-4 mg.
In one embodiment of the invention, the first phase is 25-35 ℃ A after top dead center and the second phase is 15-25 ℃ A before top dead center.
It should be noted that, a specific implementation manner of the dual-fuel engine combustion mode switching control system according to the embodiment of the present invention is similar to a specific implementation manner of the dual-fuel engine combustion mode switching control method according to the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not repeated here in order to reduce redundancy.
Further, the embodiment of the invention discloses a vehicle which is provided with the dual-fuel engine combustion mode switching control system. The vehicle can realize smooth transition among combustion modes, reduce power change and torque fluctuation when the combustion modes are switched, and further improve smoothness.
In addition, other configurations and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described in detail in order to reduce redundancy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A switching control method of combustion modes of a dual fuel engine, characterized in that the combustion modes include first to fourth combustion modes in which a fuel type, an oil supply manner, and an ignition manner are different, wherein in the first combustion mode, gasoline is supplied by way of port injection and the ignition manner is spark ignition, in the second combustion mode, gasoline is supplied by way of mixture injection and the ignition manner is compression ignition, in the third combustion mode, gasoline is supplied by way of port injection and diesel is supplied by way of in-cylinder direct injection, the ignition manner is diesel fuel ignition gasoline by compression ignition, in the fourth combustion mode, diesel is supplied by way of in-cylinder direct injection, and the ignition manner is compression ignition, the method comprising the steps of:
controlling a spark plug of the dual-fuel engine to stop ignition when switching from the first combustion mode to the second combustion mode;
when the second combustion mode is switched to the third combustion mode, supplying a preset amount of diesel oil in a mode of direct in-cylinder injection, and correspondingly reducing the supply amount of gasoline;
when the third combustion mode is switched to the fourth combustion mode, the supply amount of diesel oil is gradually increased, the supply amount of gasoline is gradually reduced, and the post-injection phase of the diesel oil is gradually shifted forward from the first phase to the second phase.
2. The switching control method of the combustion mode of the dual fuel engine according to claim 1, characterized by further comprising:
controlling an EGR valve of the dual-fuel engine to be opened, controlling an exhaust valve of the dual-fuel engine to be opened for a second time, and controlling a throttle valve of the dual-fuel engine to be opened to a maximum opening degree with a first slope when switching from the first combustion mode to the second combustion mode, wherein the first slope is set according to the rotating speed and the torque of the dual-fuel engine;
when the second combustion mode is switched to the third combustion mode, adjusting the opening degree of the throttle valve according to the rotating speed and the torque of the dual-fuel engine, and controlling the opening or closing of the EGR valve and the secondary opening or secondary closing of the exhaust valve according to the rotating speed and the torque of the dual-fuel engine;
controlling the exhaust valve to close twice when switching from the third combustion mode to the fourth combustion mode.
3. The switching control method of the combustion mode of the dual fuel engine according to claim 2, characterized in that in the first combustion mode, the load of the dual fuel engine is adjusted by controlling the opening degree of the throttle valve.
4. The switching control method of the combustion mode of the dual fuel engine as claimed in claim 1, wherein the preset amount of the diesel is 2-4 mg.
5. The dual fuel engine combustion mode switching control method of claim 1, wherein the first phase is 25-35 ° CA after top dead center and the second phase is 15-25 ° CA before top dead center.
6. A switching control system of combustion modes of a dual fuel engine, characterized in that the combustion modes include first to fourth combustion modes in which a fuel type, an oil supply manner, and an ignition manner are different, wherein in the first combustion mode, gasoline is supplied by way of port injection and the ignition manner is spark ignition, in the second combustion mode, gasoline is supplied by way of mixture injection and the ignition manner is compression ignition, in the third combustion mode, gasoline is supplied by way of port injection and diesel is supplied by way of in-cylinder direct injection, the ignition manner is diesel pilot gasoline by way of compression ignition, in the fourth combustion mode, diesel is supplied by way of in-cylinder direct injection, and the ignition manner is compression ignition, the system comprising:
a dual fuel engine 410 including a gasoline injector 411, a diesel injector 412, and a spark plug 413;
and a controller 420 for controlling the ignition stop of the ignition plug 413 when switching from the first combustion mode to the second combustion mode, controlling the diesel injector 412 to supply a predetermined amount of diesel fuel by in-cylinder direct injection and controlling the gasoline injector 411 to reduce the supply amount of gasoline in accordance with the supply amount of diesel fuel when switching from the second combustion mode to the third combustion mode, and controlling the diesel injector 412 to gradually increase the supply amount of diesel fuel and the gasoline injector 411 to gradually reduce the supply amount of gasoline when switching from the third combustion mode to the fourth combustion mode and controlling the diesel injector 411 to gradually shift the post-injection phase of diesel fuel from the first phase to the second phase.
7. The dual fuel engine combustion mode switching control system of claim 6, wherein the dual fuel engine 410 further comprises an EGR valve, an exhaust valve, and a throttle valve, the controller further configured to:
controlling the EGR valve to open and the exhaust valve to open twice and controlling the throttle valve to open to a maximum opening degree with a first slope at the time of switching from the first combustion mode to the second combustion mode, wherein the first slope is set according to the rotation speed and torque of the dual-fuel engine;
adjusting the opening degree of the throttle valve according to the rotation speed and torque of the dual-fuel engine 410 and controlling the opening or closing of the EGR valve and the secondary opening or secondary closing of the exhaust valve according to the rotation speed and torque of the dual-fuel engine 410 when switching from the second combustion mode to the third combustion mode;
controlling the exhaust valve to close twice when switching from the third combustion mode to the fourth combustion mode.
8. The dual fuel engine combustion mode switching control system of claim 6, wherein the predetermined amount of the diesel is 2-4 mg.
9. The dual fuel engine combustion mode switching control system of claim 6, wherein the first phase is 25-35 ° CA after top dead center and the second phase is 15-25 ° CA before top dead center.
10. A vehicle characterized in that a switching control system of the combustion mode of the dual fuel engine according to any one of claims 6 to 9 is provided.
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