CN116398333A - Air inlet preheating system for cold start of diesel engine - Google Patents
Air inlet preheating system for cold start of diesel engine Download PDFInfo
- Publication number
- CN116398333A CN116398333A CN202310246834.XA CN202310246834A CN116398333A CN 116398333 A CN116398333 A CN 116398333A CN 202310246834 A CN202310246834 A CN 202310246834A CN 116398333 A CN116398333 A CN 116398333A
- Authority
- CN
- China
- Prior art keywords
- plate
- upper plate
- oil sprayer
- heating plate
- air inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 116
- 239000000446 fuel Substances 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 16
- 239000003921 oil Substances 0.000 claims description 75
- 238000003825 pressing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 8
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 238000000889 atomisation Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012802 pre-warming Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
- F02M31/042—Combustion air
-
- 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
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
- F02M31/13—Combustion air
-
- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10373—Sensors for intake systems
-
- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10373—Sensors for intake systems
- F02M35/1038—Sensors for intake systems for temperature or pressure
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses an inlet air preheating system for diesel engine cold start, this system includes integration upper plate, the upper plate keysets, the sprayer mount pad, the sprayer mounting hole, the sprayer platform, the double-screw bolt, auxiliary heating stick briquetting, wall temperature sensor, the support mounting arch, the hot plate threading hole, the hot plate support, the spoiler, the hot plate clamp plate, the main hot plate, engine air inlet pipe and controller, utilize the low pressure fuel spray striking high temperature main hot plate of sprayer to realize the ignition, the reinforcing is atomized, the reaction rate is improved, introduce the spoiler and form the stability that the backward flow improved flame in high-speed air current, can improve the inlet air temperature fast, shorten cold start time, and reduce fuel and electric energy consumption. The system flexibly adjusts the oil injection strategy according to different working conditions, has compact design, is convenient to integrate, has low manufacturing and maintenance cost, and is suitable for being applied to heavy diesel engines.
Description
Technical Field
The invention relates to the technical field of cold start of diesel engines, in particular to an air inlet preheating system for cold start of a diesel engine.
Background
The diesel engine is difficult to start under the severe cold environment, especially when the temperature is lower than-20 ℃, various cold starting auxiliary measures are needed to be adopted due to the problems of low compression top dead center temperature, serious air leakage at low rotating speed, poor fuel atomization evaporation and the like, and mainly comprise fuel heating, air inlet preheating, engine body preheating, storage battery heat preservation and the like. The intake preheating measures can effectively improve the in-cylinder thermal force condition in a short time under the working environment of-40 ℃ to-20 ℃, improve the cold starting performance and effectively ensure the emergency starting of diesel engines of heavy trucks and special vehicles.
Research shows that the common air inlet preheating device comprises an electric heater, a flame preheating plug, an energy storage type heat sensitive ceramic (PTC) starter and a glow plug arranged in a cylinder, wherein the electric heater, the flame preheating plug and the energy storage type heat sensitive ceramic (PTC) starter are arranged on an air inlet pipe. The flame preheating mode is suitable for scenes with larger air inlet flow and extremely low temperature, and has obvious advantages for rapid and reliable cold start of a heavy diesel engine. However, the traditional flame glow plug has longer starting time, low fuel gasification and combustion efficiency, easy coking and carbon deposition generation, low degree of freedom of system control and poor robustness, so that the preheating effect and the working limit temperature are limited, the energy consumption of the electric heater is higher, and the cost of the PTC starter is higher.
Therefore, development of an intake air preheating device with fast temperature rise, low energy consumption, low cost, convenient control and reliable operation is needed.
Disclosure of Invention
The present disclosure provides an intake air preheating system for cold start of a diesel engine, which is used for overcoming at least one technical problem existing in the related art.
According to an embodiment of the present disclosure, there is provided an intake preheating system for cold start of a diesel engine, including an integrated upper plate, an upper plate adapter plate, a fuel injector mount, a fuel injector mounting hole, a fuel injector platen, a stud, an auxiliary heating rod press block, a wall temperature sensor, a bracket mounting boss, a heating plate threading hole, a heating plate bracket, a spoiler, a heating plate press plate, a main heating plate, an engine intake duct, and a controller, wherein
The integrated upper plate is fixed on the upper plate adapter plate, and the upper plate adapter plate is fixed on the engine air inlet pipeline; the integrated upper plate, one side of the upper surface is provided with the oil sprayer mounting seat, an oil sprayer mounting hole is formed in the oil sprayer mounting seat, the front end of the oil sprayer is pressed into the oil sprayer mounting hole at a preset angle, the spray axis of the oil sprayer and the air inlet direction of an engine air inlet pipeline form an acute angle, the rear end of the oil sprayer is sleeved with an oil sprayer pressing table, the oil sprayer pressing table is fixed with a bolt on the integrated upper plate through a stud, an auxiliary heating rod is inserted into one side of the oil sprayer mounting seat close to the front end of the oil sprayer, an auxiliary heating rod pressing block is arranged at one end of the auxiliary heating rod on the oil sprayer mounting seat, a wall surface temperature sensor is arranged on the surface of the oil sprayer mounting seat above the auxiliary heating rod, a clamping groove is formed in the lower surface of the integrated upper plate far away from one side of the oil sprayer, a bracket mounting bulge is arranged above the clamping groove of the integrated upper plate, and a heating plate threading through hole is formed in one side of the integrated upper plate far away from the oil sprayer; the upper plate adapter plate is a hollow plate and is arranged below the integrated upper plate and is fixed with the integrated upper plate through bolts; the front side of the heating plate support is inverted T-shaped, the side surface of the heating plate support is H-shaped, the heating plate support is integrally formed, the upper U part is vertically clamped into a clamping groove of the integrated upper plate, the heating plate support is fixed with the integrated upper plate through a bolt screwed into a support mounting boss, a spoiler with a preset height is arranged in the middle of the heating plate support, a hole site in the horizontal direction is reserved in the lower U part of the heating plate support, and the lower U end of the heating plate support is fixed with a heating plate pressing plate through a bolt; one end of the main heating plate is horizontally inserted into a hole reserved at the lower end of the heating plate support, the other end of the main heating plate is positioned below the integrated upper plate, the heating plate support and the heating plate pressing plate compress the main heating plate, and an electric wire of the main heating plate penetrates through a heating plate threading hole of the integrated upper plate to be connected with an alternating current power supply; a sensor mounting hole is reserved on an air inlet pipeline of the engine, the position of the sensor mounting hole is collinear with the position of the oil sprayer mounting hole along the spraying axis of the oil sprayer, an air inlet temperature sensor, an air inlet pressure sensor, an air inlet flow sensor and an oxygen concentration sensor are arranged, and the air inlet temperature, the pressure, the flow or the air speed are obtained to be used as input signals of a controller; and the controller is integrated in the vehicle electronic control unit, obtains the optimal oil injection frequency and the oil injection pulse width according to an input signal and a pre-calibrated ignition control graph table, and performs real-time feedback control according to the air inlet temperature and the air-fuel ratio in the preheated engine air inlet pipeline until the engine speed rises and the fluctuation rate falls, so as to complete the cold start process.
Optionally, the integrated upper plate and the upper plate adapter plate are sealed by a high-temperature-resistant O-shaped rubber ring.
Optionally, the fuel injector is a PFI fuel injector, the spraying axis forms an angle of 45 degrees with the horizontal direction, and the spraying pressure is 3-5 bar.
Optionally, the upper plate adapter plate is welded on the engine air inlet pipeline.
Optionally, the main heating plate is made of high-temperature-resistant silicon nitride ceramics, and rated power is 450W.
The beneficial effects of the embodiment of the specification are as follows:
the utility model provides an advance air heating system for diesel engine cold start, spray the fuel through the hot plate in the sprayer to the admission line, make the fuel spray strike high temperature heating board wall and realize the ignition, strengthen atomizing, improve reaction rate, wherein the fuel sprays adopts PFI sprayer low pressure to spray, can improve control accuracy, guarantee atomization effect, can reduce oil feeding system's cost again, and the hot plate adopts high temperature resistant silicon nitride ceramic, and start-up time is short and with low costs. Meanwhile, in order to improve the stability of flame in high-speed airflow, a turbulent flow plate is introduced to form backflow, so that the local wind speed can be reduced, a large-area backflow area is formed, the fuel evaporation and the oil-gas mixing are promoted, and the continuous ignition and flame stabilization under the conditions of high wind speed and large flow are facilitated. The controller controls the air inlet temperature in real time through a sensor in the system, can flexibly select an optimal oil injection strategy according to different working conditions, performs feedforward and feedback control, completes the cold start process, has high control freedom, is beneficial to quickly improving the air inlet temperature, shortens the cold start time, and reduces fuel oil and electric energy consumption. The system has compact design, is convenient to integrate into an engine air inlet pipe, has low manufacturing and maintenance cost, and is convenient to apply to a cold start system of a heavy diesel engine.
The innovation points of the embodiment of the specification are as follows:
1. in the specification, ignition is realized by impacting the wall surface of the high-temperature heating plate through low-pressure fuel spray, the Leidenfrost effect is utilized for crushing, enhancing atomization and evaporation, and the low-temperature reaction rate is improved, wherein the fuel adopts PFI (pulse-width modulation) fuel injector low-pressure injection, so that the control precision can be improved, the atomization effect can be ensured, the cost of an oil supply system can be reduced, the heating plate adopts high-temperature-resistant silicon nitride ceramics, the starting time is shorter, the surface temperature can reach 1200 ℃, the cost is lower, the working is reliable, the damage caused by dry combustion can be avoided, and the high-temperature-resistant silicon nitride fuel injector is one of innovation points of the embodiment of the specification.
2. In the specification, active flow control is performed by arranging the spoiler, and fuel is sprayed by adopting the reverse wind direction, so that the local wind speed can be reduced, a large-area backflow area is formed, fuel evaporation and oil-gas mixing are promoted, continuous ignition and flame stabilization under the condition of high wind speed and large flow are facilitated, and the air inlet temperature is rapidly increased in a short time, so that the method is one of innovation points of the embodiment of the specification.
3. In the specification, a low-power auxiliary heating rod is introduced into the oil sprayer seat, and the proper wall temperature is controlled, so that the normal operation of the oil sprayer under the low-temperature condition can be ensured, and the oil sprayer is one of the innovation points of the embodiment of the specification.
4. In the specification, the ECU controller flexibly selects the optimal oil injection strategy according to different working conditions to perform feedforward and feedback control, the cold starting process is completed, the control degree of freedom is high, the balance of the temperature rise rate and the combustion efficiency is facilitated to be realized, the air inlet preheating time can be shortened, the fuel oil and the electric energy consumption can be reduced, and the method is one of innovation points of the embodiment of the specification.
5. In the specification, the system has small volume, compact design, small number of parts, convenient integration into an engine air inlet pipe, low manufacturing and maintenance cost and convenient application in a cold start system of a heavy diesel engine, and is one of innovation points of the embodiment of the specification.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic diagram of an intake air preheating system for cold start of a diesel engine according to an embodiment of the present disclosure.
In the figure, 1-integrated upper plate, 2-upper plate adapter plate, 3-oil injector mount pad, 4-oil injector mounting hole, 5-oil injector, 6-oil injector press bench, 7-stud, 8-auxiliary heating rod, 9-auxiliary heating rod briquetting, 10-wall temperature sensor, 11-bracket mounting boss, 12-heating plate threading hole, 13-heating plate bracket, 14-spoiler, 15-heating plate pressing plate, 16-main heating plate, 17-engine air inlet pipeline, 18-controller, 19-spraying axis, 20-main heating plate vertical distance, 21-main heating plate horizontal distance.
Detailed Description
The technical solutions of the embodiments of the present specification will be clearly and completely described below with reference to the drawings of the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments and figures herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
The embodiments of the present specification disclose an intake air preheating system for cold start of a diesel engine, and the following detailed description will be given respectively.
Fig. 1 is a schematic diagram of an intake air preheating system for cold start of a diesel engine according to an embodiment of the present disclosure. As shown in fig. 1, an intake preheating system for cold start includes an integrated upper plate 1, an upper plate adapter plate 2, a fuel injector mount 3, a fuel injector mount hole 4, a fuel injector 5, a fuel injector stage 6, a stud 7, an auxiliary heating rod 8, an auxiliary heating rod press block 9, a wall temperature sensor 10, a bracket mounting boss 11, a heating plate threading hole 12, a heating plate bracket 13, a spoiler 14, a heating plate press plate 15, a main heating plate 16, an engine intake duct 17, and a controller 18, wherein
The integrated upper plate 1 is fixed on an upper plate adapter plate 2, and the upper plate adapter plate 2 is fixed on an engine air inlet pipeline 17.
In a specific embodiment, the integrated upper plate 1 and the upper plate adapter plate 2 are sealed by a high-temperature-resistant O-shaped rubber ring.
In a specific embodiment, the upper plate adapter plate 2 is welded to the engine intake conduit 17. The upper plate adapter plate is used for fixing the integrated upper plate with an air inlet pipeline of the engine.
The integrated upper plate 1, upper surface one side is provided with sprayer mount pad 3, is provided with sprayer mounting hole 4 in the sprayer mount pad 4, and sprayer 5's front end is pressed in sprayer mounting hole 4 with preset angle, and the spraying axis of sprayer is the acute angle with engine air intake duct's air inlet direction.
In a specific embodiment, the injector 5 is a PFI injector, and the spray axis is at an angle of 45 ° to the horizontal. The fuel injector 5 is provided with 4 spray holes, the fuel is diesel, and the spray pressure is 3-5 bar.
In a specific embodiment, the fuel injector 5 and the fuel injector mounting hole 4 are sealed by an O-shaped rubber ring.
The rear end of the oil sprayer 5 is sleeved with an oil sprayer pressing table 6, the oil sprayer pressing table 6 is fixed with a bolt of the integrated upper plate 1 through a stud 7, and an auxiliary heating rod 8 is inserted into one side, close to the front end of the oil sprayer 5, of the oil sprayer mounting seat 3. The low-power auxiliary heating rod is introduced into the oil sprayer mounting seat, and the proper wall temperature is controlled, so that the normal operation of the oil sprayer under the low-temperature condition can be ensured. The auxiliary heating rod is only turned on when the environment is below the condensation point of diesel.
An auxiliary heating rod pressing block 9 is arranged at one end of the auxiliary heating rod 8 on the oil sprayer mounting seat 3, the auxiliary heating rod is radially and axially fixed through the auxiliary heating rod pressing block, and a wall surface temperature sensor 10 is arranged on the surface, above the auxiliary heating rod 8, of the oil sprayer mounting seat 3.
In a specific embodiment, the wall temperature sensor 10 is a screw type K thermocouple. The upper surface of the oil sprayer mounting seat is provided with a screw type wall surface temperature sensor which is connected with a temperature controller and a relay to control the wall surface temperature.
In a specific embodiment, the auxiliary heating rod 8 has a rated power of 80W.
A clamping groove is formed in the lower surface of one side, far away from the oil sprayer 5, of the integrated upper plate 1, a bracket mounting protrusion 11 is arranged above the clamping groove of the integrated upper plate 1, and a heating plate threading through hole 12 is formed in one side, far away from the oil sprayer 5, of the integrated upper plate 1.
The power cord of the main heating plate 16 passes through the threading hole 12 to be connected with an external alternating current power supply, and the threading hole 12 is screwed into the sealing joint to be fixed with the integrated upper plate 1.
The upper plate adapter plate 2 is a hollow plate and is arranged below the integrated upper plate 1 and is fixed with the integrated upper plate 1 through bolts.
In a specific embodiment, the bolts connected to the integrated upper plate 1 are all M4 in type. The model of each other connecting bolt is M6.
The front surface of the heating plate support 13 is inverted T-shaped, the side surface of the heating plate support is H-shaped, the upper U part is vertically clamped into a clamping groove of the integrated upper plate 1, and the heating plate support 13 and the integrated upper plate 1 are fixed through bolts screwed into the support mounting protrusions 11. The protrusions are provided to screw holes in the upper plate to fix the bracket.
The middle part of the heating plate bracket 13 is provided with a spoiler 14 of a preset height. The active flow control is carried out by arranging the spoiler, and meanwhile, fuel is sprayed by adopting the reverse wind direction, so that the local wind speed can be reduced, a large-area backflow area is formed, fuel evaporation and oil-gas mixing are promoted, continuous ignition and flame stabilization under the condition of high wind speed and large flow are facilitated, and the air inlet temperature is rapidly increased in a short time.
The lower U part is reserved with a hole site in the horizontal direction, and the lower U end of the heating plate support 13 is fixed with the heating plate pressing plate 15 through bolts.
One end of the main heating plate 16 is horizontally inserted into a hole reserved at the lower end of the heating plate support 13, the other end of the main heating plate 16 is positioned below the integrated upper plate 1, the main heating plate 16 is pressed tightly by the heating plate support 13 and the heating plate pressing plate 15, and an electric wire of the main heating plate 16 penetrates through the heating plate threading hole 12 of the integrated upper plate 1 to be connected with an alternating current power supply.
In one embodiment, the main heater plate 16 is made of high temperature resistant silicon nitride ceramic with a rated power of 450W.
The ignition is realized by impacting the wall surface of the high-temperature heating plate through low-pressure fuel spray, the Leidenfrost effect is utilized to crush and enhance atomization and evaporation, and the low-temperature reaction rate is improved, wherein the fuel adopts the PFI injector for low-pressure injection, so that the control precision can be improved, the atomization effect is ensured, the cost of an oil supply system can be reduced, the heating plate adopts high-temperature resistant silicon nitride ceramics, the starting time is shorter, the surface temperature can reach 1200 ℃, the cost is lower, the operation is reliable, and the damage caused by dry combustion can be avoided.
The engine air inlet pipeline 17 is reserved with a sensor mounting hole, the position of the sensor mounting hole is collinear with the oil sprayer mounting hole along the spraying axis of the oil sprayer, and an air inlet temperature sensor, an air inlet pressure sensor, an air inlet flow sensor and an oxygen concentration sensor are arranged to obtain the air inlet temperature, pressure, flow or wind speed as input signals of a controller.
In fig. 1, the left side is low-temperature air inflow, the right side is preheated high-temperature air flow, and the preheated high-temperature air flow is introduced into a combustion chamber in an engine cylinder. The geometric relative positions of the air inlet preheating device are as follows: the PFI fuel injector is placed against the incoming flow direction, the spray axis 19 forms an angle of 45 degrees with the horizontal direction, the spoiler is positioned at the upstream of the main heating plate, the vertical distance 20 of the main heating plate is the distance between the lowest end of the heating plate support and the inner surface above the air inlet pipe of the engine, and the horizontal distance 21 of the main heating plate is the distance between the fuel injection falling point of the upper surface of the main heating plate and the leftmost front end of the heating plate support. The oil injection drop point position on the main heating plate has an optimal range, so that the ignition success rate is highest, the flame is most stable, and the vertical distance and the horizontal distance of the main heating plate can be adjusted to further optimize. The engine intake pipe 18 is provided with various sensors, and an intake air temperature sensor, an intake air pressure sensor, and an intake air flow sensor are provided before the intake air preheating device to respectively measure the intake air temperature T before the preheating in Pre-heating advance air pressure P in Intake air flow rate Q in Or the inlet wind speed V in After the intake air preheating device, 1 or more intake air temperature sensors and oxygen sensors are arranged to respectively measure the preheated intake air temperature T out Air-fuel ratio lambda after preheating out Analog signals of temperature, pressure, flow, air-fuel ratio, etc. are input to the ECU to control the injection strategy.
Before the system is installed, experimental calibration work is needed to be carried out, and the optimal oil injection parameters including the oil injection frequency f are determined under different air inlet flow rates or air speeds inj And fuel injection pulse width T inj The method can achieve higher temperature rise rate and combustion efficiency at the same time, and then form a MAP graph to store the MAP graph into the ECU for feedforward and feedback control under different engine working conditions.
The controller 18 is integrated in the vehicle electronic control unit, and obtains the optimal oil injection frequency and the oil injection pulse width according to the input signal and a pre-calibrated ignition control graph table, and carries out real-time feedback control according to the air inlet temperature and the oxygen concentration in the preheated engine air inlet pipeline 17 until the engine speed rises and the fluctuation rate falls, and the cold start process is completed.
The flow steps of the system control method are as follows. Firstly, an engine starting motor is started to drive a crankshaft to rotate and a piston to move, and oil is not injected into an engine cylinder at the moment, so that the engine is in an idle state. Then, the ECU controller and the main heating plate are started, if the ambient temperature is lower than the condensation point of diesel oil, the auxiliary heating rod is started together, and the heating plate is electrified for about 1-2 min to enable the surface temperature of the heating plate to be high enough. The ECU performs the control based on the measured pre-warming intake air temperature T in Pre-heating advance air pressure P in Intake air flow rate Q in Or the inlet wind speed V in The optimal injection parameter oil injection frequency f is obtained by MAP table lookup inj And fuel injection pulse width T inj Beginning to spray oil and preheat flame, and monitoring the preheated air inlet temperature T in real time out Air-fuel ratio lambda after preheating out Judging whether a proper in-cylinder thermal force condition is reached. When the requirement is met, fuel injection and ignition are started in the engine cylinder, if the rotating speed is continuously increased to reach the normal working rotating speed and the rotating speed fluctuation rate is gradually reduced, the starting is successful, the preheating is stopped, and otherwise, the preheating is continued.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
Those of ordinary skill in the art will appreciate that: the modules in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
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, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. An intake preheating system for cold start of a diesel engine is characterized by comprising an integrated upper plate, an upper plate adapter plate, an oil sprayer mounting seat, an oil sprayer mounting hole, an oil sprayer pressing table, a stud, an auxiliary heating rod pressing block, a wall surface temperature sensor, a bracket mounting protrusion, a heating plate threading hole, a heating plate bracket, a spoiler, a heating plate pressing plate, a main heating plate, an engine air inlet pipeline and a controller, wherein
The integrated upper plate is fixed on the upper plate adapter plate, and the upper plate adapter plate is fixed on the engine air inlet pipeline;
the integrated upper plate, one side of the upper surface is provided with the oil sprayer mounting seat, an oil sprayer mounting hole is formed in the oil sprayer mounting seat, the front end of the oil sprayer is pressed into the oil sprayer mounting hole at a preset angle, the spray axis of the oil sprayer and the air inlet direction of an engine air inlet pipeline form an acute angle, the rear end of the oil sprayer is sleeved with an oil sprayer pressing table, the oil sprayer pressing table is fixed with a bolt on the integrated upper plate through a stud, an auxiliary heating rod is inserted into one side of the oil sprayer mounting seat close to the front end of the oil sprayer, an auxiliary heating rod pressing block is arranged at one end of the auxiliary heating rod on the oil sprayer mounting seat, a wall surface temperature sensor is arranged on the surface of the oil sprayer mounting seat above the auxiliary heating rod, a clamping groove is formed in the lower surface of the integrated upper plate far away from one side of the oil sprayer, a bracket mounting bulge is arranged above the clamping groove of the integrated upper plate, and a heating plate threading through hole is formed in one side of the integrated upper plate far away from the oil sprayer;
the upper plate adapter plate is a hollow plate and is arranged below the integrated upper plate and is fixed with the integrated upper plate through bolts;
the front side of the heating plate support is inverted T-shaped, the side surface of the heating plate support is H-shaped, the heating plate support is integrally formed, the upper U part is vertically clamped into a clamping groove of the integrated upper plate, the heating plate support is fixed with the integrated upper plate through a bolt screwed into a support mounting boss, a spoiler with a preset height is arranged in the middle of the heating plate support, a hole site in the horizontal direction is reserved in the lower U part of the heating plate support, and the lower U end of the heating plate support is fixed with a heating plate pressing plate through a bolt;
one end of the main heating plate is horizontally inserted into a hole reserved at the lower end of the heating plate support, the other end of the main heating plate is positioned below the integrated upper plate, the heating plate support and the heating plate pressing plate compress the main heating plate, and an electric wire of the main heating plate penetrates through a heating plate threading hole of the integrated upper plate to be connected with an alternating current power supply;
a sensor mounting hole is reserved on an air inlet pipeline of the engine, the position of the sensor mounting hole is collinear with the position of the oil sprayer mounting hole along the spraying axis of the oil sprayer, an air inlet temperature sensor, an air inlet pressure sensor, an air inlet flow sensor and an oxygen concentration sensor are arranged, and the air inlet temperature, the pressure, the flow or the air speed are obtained to be used as input signals of a controller;
and the controller is integrated in the vehicle electronic control unit, obtains the optimal oil injection frequency and the oil injection pulse width according to an input signal and a pre-calibrated ignition control graph table, and performs real-time feedback control according to the air inlet temperature and the air-fuel ratio in the preheated engine air inlet pipeline until the engine speed rises and the fluctuation rate falls, so as to complete the cold start process.
2. The system of claim 1, wherein the integrated upper plate and the upper plate adapter plate are sealed by a high temperature resistant O-ring rubber.
3. The system of claim 1, wherein the injector is a PFI injector, the spray axis is at 45 ° to the horizontal, and the spray pressure is 3-5 bar.
4. The system of claim 1, wherein the upper plate adapter plate is welded to the engine intake conduit.
5. The system of claim 1, wherein the main heating plate is made of high temperature resistant silicon nitride ceramic and rated at 450W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310246834.XA CN116398333A (en) | 2023-03-15 | 2023-03-15 | Air inlet preheating system for cold start of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310246834.XA CN116398333A (en) | 2023-03-15 | 2023-03-15 | Air inlet preheating system for cold start of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116398333A true CN116398333A (en) | 2023-07-07 |
Family
ID=87018918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310246834.XA Pending CN116398333A (en) | 2023-03-15 | 2023-03-15 | Air inlet preheating system for cold start of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116398333A (en) |
-
2023
- 2023-03-15 CN CN202310246834.XA patent/CN116398333A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112901339B (en) | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof | |
| CN101006267B (en) | Fuel-injection system | |
| WO2006002591A1 (en) | Environmental protection fuel-saving device of vehicle | |
| CN100520049C (en) | Fuel injector with built-in positive temperature coefficient ceramic heating material | |
| CN109882270A (en) | The internal combustion engine discharged nitrous oxides closed-loop control system of ionic current and urea injection in a kind of cylinder | |
| CN101135280A (en) | Four-stroke petrol engine inner-vat sprinkler | |
| CN103615345A (en) | Cold start system and start method for flexible fuel vehicle | |
| CN111894726A (en) | Diesel engine cold-start jet flow flame auxiliary ignition device and control method thereof | |
| CN1806117A (en) | Capillary heating control and fault detection system and methodology for fuel system in an internal combustion engine | |
| CN219570212U (en) | Air inlet preheating system for cold start of diesel engine | |
| CN101457713A (en) | Subcritical steam auxiliary power gasoline engine | |
| CN116398333A (en) | Air inlet preheating system for cold start of diesel engine | |
| CN113236459A (en) | Device and method for realizing flash-boiling spraying by heating oil rail | |
| CN117307384A (en) | Methanol engine and control method | |
| JP6670718B2 (en) | Control device | |
| CN211777755U (en) | Intake charge heating device for diesel/alcohol binary fuel engine | |
| CN101598091A (en) | A kind of stabilized voltage fuel injection system | |
| CN114233540A (en) | Cold-start air inlet pipe device of methanol engine and control method thereof | |
| CN201428539Y (en) | Fuel injection system and Stirling engine with same | |
| CN104405549B (en) | Engine | |
| CN209976626U (en) | Two-stroke homogeneous charge compression ignition engine | |
| CN110219752A (en) | It is a kind of that closed-loop control system is fluctuated based on the hcci engine burn cycle of ionic current and in-cylinder water injection | |
| CN114233494B (en) | Cold starting device and method for methanol engine | |
| CN220365669U (en) | Heating type heavy oil and alcohol-based fuel gas auxiliary injection metering valve | |
| US20220307412A1 (en) | Method for operating an internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |