CN209959365U

CN209959365U - Electric control fuel injection two-stroke gasoline engine for unmanned aerial vehicle

Info

Publication number: CN209959365U
Application number: CN201920183000.8U
Authority: CN
Inventors: 谭晞铭; 谭泽裕
Original assignee: Beihai Skyline Aviation Technology Co Ltd
Current assignee: Beihai Skyline Aviation Technology Co Ltd
Priority date: 2019-02-01
Filing date: 2019-02-01
Publication date: 2020-01-17
Anticipated expiration: 2029-02-01

Abstract

The utility model discloses an automatically controlled fuel injection two-stroke gasoline engine for unmanned aerial vehicle, including engine cylinder body, crankcase, air throttle assembly, fuel sprayer, miniature high-pressure oil pump, sensor, electronic ignition ware, automatically controlled unit and throttle steering wheel, the automatically controlled unit is used for gathering the different data of each sensor that the engine gave when starting, receives the throttle signal that unmanned aerial vehicle flight control system gave simultaneously, through the operation, gives the fuel feeding signal of oil pump and the opening angle signal of air throttle, through the opening angle of throttle steering wheel control air throttle and the switching frequency of fuel sprayer. The utility model discloses replace diaphragm formula carburetor with the throttle valve, adopt the fuel intake duct injection mode, according to the real-time operating mode of engine, control fuel accurate spray to the crankcase in, improve fuel efficiency, reduce oil consumption and improve the stability and the reliability of engine work. The electronic control unit is provided with an environmental pressure sensor, so that the engine can stably work in a high-altitude environment.

Description

Electric control fuel injection two-stroke gasoline engine for unmanned aerial vehicle

Technical Field

The utility model discloses a two-stroke gasoline engine special design development that one set was special for unmanned aerial vehicle uses adopts microcomputer electronic control's fuel in the injection system.

Background

At present, most unmanned aerial vehicles taking fuel engines as power adopt two-stroke reciprocating piston engines. However, the most commonly used fuel supply for two-stroke reciprocating piston gasoline engines is the diaphragm carburetor. Its important role in the engine may be referred to as the engine's "heart". But in actual use, the failure rate of the carburetor is high. The reasons are the following two points:

(1) all the operating characteristics of the engine of the unmanned aerial vehicle are related to the carburetor, such as acceleration, transition, oil consumption and the like. Therefore, when the diaphragm carburetor works actually, the working condition of the engine is often unstable due to the influences of weather conditions, altitude, working duration and the like.

(2) The quality problem of related parts greatly shortens the service life of the carburetor. Such as reduced cleanliness, increased corrosion and wear of carburetor components, and the like.

The common fault phenomena of the diaphragm type two-stroke gasoline engine carburetor are as follows: difficult starting, unstable idling, poor transition, insufficient power, oil leakage, high oil consumption and the like. The failure rate of engines using diaphragm carburetors is 70%.

For an unmanned aerial vehicle, the failure of the engine is fatal, and a slight failure occurs, so that the crash is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an automatically controlled fuel injection two-stroke gasoline engine for unmanned aerial vehicle, including engine cylinder body, crankcase, air throttle assembly, fuel sprayer, miniature high-pressure oil pump, sensor, electronic ignition ware, electrical unit and throttle steering wheel, cylinder body, crankcase, air throttle assembly, fuel sprayer and fuel oil pump link to each other in proper order and constitute the closed circuit of oil feeding system, and electronic ignition ware links to each other with the cylinder body, air throttle assembly includes the air throttle, and throttle steering wheel is connected with air throttle and fuel sprayer electricity respectively, and the sensor links to each other with electrical unit and electronic ignition ware respectively;

the electronic control unit is used for acquiring different data of each sensor given by the starting of the engine, receiving an accelerator signal given by the unmanned aerial vehicle flight control system, giving an oil supply signal of the oil pump and an opening angle signal of the throttle valve through operation, and controlling the opening angle of the throttle valve and the switching frequency of the oil nozzle through an accelerator steering engine;

the micro high-pressure oil pump is used for receiving an oil supply signal given by the electric control unit, calculating oil supply pressure and oil supply quantity and supplying oil to the oil nozzle;

the throttle steering engine is used for controlling the opening angle of the throttle according to the opening angle signal of the throttle given by the electric control unit.

Preferably, the sensors include an engine temperature sensor, an air temperature sensor, and an intake air flow sensor.

Preferably, the device further comprises an ambient pressure sensor, wherein the ambient pressure sensor is used for collecting changes of atmospheric pressure in real time and calculating the altitude of the engine during working to automatically correct the fuel injection amount.

The utility model discloses a two-stroke gasoline engine special design development that one set was special for unmanned aerial vehicle uses adopts microcomputer electronic control's fuel in the injection system. The electric control fuel injection system is developed aiming at the defects of difficult starting, unstable idling, poor transition, insufficient power, oil leakage, high oil consumption and the like of a diaphragm type carburetor of a reciprocating piston gasoline engine used by the current commercial unmanned aerial vehicle.

The diaphragm carburetor is replaced by the throttle valve, the fuel inlet injection mode is adopted, and the fuel is accurately injected into the crankcase according to the real-time working condition of the engine, so that the fuel efficiency is improved, the fuel consumption is reduced, and the working stability and reliability of the engine are improved.

An engine temperature sensor, an air temperature sensor and an air inlet flow sensor are integrated in an electronic fuel injection system, and an Electronic Control Unit (ECU) can correct fuel injection quantity in real time according to the ambient temperature, the current working temperature of an engine and the air inlet flow, so that stable operation under various working conditions is ensured.

An Electronic Control Unit (ECU) is provided with an environmental pressure sensor, so that the change of atmospheric pressure can be acquired in real time, the altitude of the engine during working is calculated, and the fuel injection quantity is automatically corrected, so that the engine can stably work in the high altitude environment.

Drawings

Fig. 1 is a schematic structural diagram of an electric control fuel injection two-stroke gasoline engine for an unmanned aerial vehicle.

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

in the figure, the engine comprises an engine cylinder body 1, an engine cylinder body 2, a crankcase 3, a throttle valve assembly 4, an oil nozzle 5, a miniature high-pressure oil pump 6, a Hall sensor 7, an electronic igniter 8, an electronic control unit 9, a throttle valve 10 and a throttle steering engine.

Detailed Description

As shown in fig. 1 and 2, the utility model discloses an automatically controlled fuel injection two-stroke gasoline engine for unmanned aerial vehicle, including engine cylinder body 1, crankcase 2, air throttle assembly 3, fuel sprayer 4, miniature high-pressure oil pump 5, sensor, electronic point firearm 7, electrical unit 8 and throttle steering wheel 10.

An electric control fuel injection two-stroke gasoline engine for an unmanned aerial vehicle forms a closed loop of an oil supply system through a cylinder body 1, a crankcase 2, a throttle valve assembly 3, an oil nozzle 4 and a fuel oil pump 5. Fuel is pumped to the injector 4 by an oil pump 5. When the engine is started, a starting signal of the engine is transmitted to the electronic control unit 8 and the electronic igniter 7 by the Hall sensor 6 and other sensors, and is simultaneously transmitted to the unmanned aerial vehicle flight control system.

The electric control unit 8 receives an accelerator signal given by the unmanned aerial vehicle flight control system while acquiring different data of each sensor given when the engine is started, gives an oil supply signal of the oil pump 5 and an opening angle signal of the throttle valve 9 through operation, and controls an opening angle of the throttle valve 9 and a switching frequency of the oil nozzle 4 through the accelerator steering engine 10.

After the oil pump 5 receives the oil supply signal given by the electronic control unit 8, the oil supply pressure and the oil supply amount are calculated, the oil is supplied to the oil nozzle 4, and the oil nozzle 4 injects oil to the crankcase 2 according to the switching frequency signal given by the electronic control unit 8. The throttle steering engine 10 controls the opening angle of the throttle valve 9 according to the opening angle signal of the throttle valve 9 given by the electronic control unit 8.

The opening angle signal of the throttle valve 9 is fed back to the oil pump 5 through the electronic control unit 8 to adjust the oil injection pressure and the oil injection quantity. The engine adjusts the rotational speed that oil injection pressure and fuel injection quantity come control engine through the opening angle of throttle 9 and oil pump 5, and the engine changes the screw pulling force through the rotational speed change, controls unmanned aerial vehicle's flight gesture and speed.

The electrically controlled fuel injection system measures the air amount sucked into the engine with sensor and supplies proper amount of gasoline to the engine via high pressure injection. The computer controlled process of controlling the mixture ratio of air and gasoline is referred to as electronically controlled fuel injection. The oil supply mode is fundamentally different from the traditional carburetor.

Compared with the supply mixing mode of a diaphragm carburetor, the electronic control fuel injection system has the following advantages:

(1) by adopting an electric control technology, the exhaust pollution is reduced, the fuel consumption of the engine is reduced, and the stricter emission regulation requirements can be met.

(2) The Electronic Control Unit (ECU) reacts quickly to the change of the throttle valve, so that the operating performance and the acceleration performance of the engine are improved, and good power performance indexes can be kept; the engine is allowed to adopt a higher compression ratio, the thermal efficiency of the engine is improved, and the knocking tendency of the engine can be reduced.

(3) The Electronic Fuel Injection (EFI) system has strong adaptability, only maps in chips of an Electronic Control Unit (ECU) need to be changed for engines of different models, and the same oil pump, nozzle, Electronic Control Unit (ECU) and the like can be used in products of different specifications and models, so that series products can be formed conveniently.

(4) The performance of the engine is convenient to adjust.

The electronic injection requires special equipment to read an Electronic Control Unit (ECU) code, the set electronic injection quantity is accurately adjusted through the special equipment, the oil is saved, the atomization is good, the combustion is good, the power is strong, the emission is good, the adaptability is good, the ignition time of the injection quantity can be automatically reduced when the altitude rises, the reliability is high, and the maintenance period is long.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric control fuel injection two-stroke gasoline engine for an unmanned aerial vehicle is characterized by comprising an engine cylinder body, a crankcase, a throttle valve assembly, an oil nozzle, a miniature high-pressure oil pump, a sensor, an electronic igniter, an electric control unit and a throttle steering engine, wherein the cylinder body, the crankcase, the throttle valve assembly, the oil nozzle and the fuel oil pump are sequentially connected to form a closed loop of an oil supply system; the accelerator steering engine is respectively and electrically connected with the throttle valve and the oil nozzle, the sensor is respectively connected with the electric control unit and the electronic igniter, and the electric control unit is connected with the accelerator steering engine and the miniature high-pressure oil pump;

2. The electronically controlled fuel injected two-stroke gasoline engine for unmanned aerial vehicle of claim 1, wherein said sensors comprise an engine temperature sensor, an air temperature sensor and an intake air flow sensor.

3. The electronically controlled fuel injected two-stroke gasoline engine as recited in claim 1, further comprising an ambient pressure sensor, wherein said ambient pressure sensor is adapted to collect changes in atmospheric pressure in real time and calculate altitude at which the engine is operating to automatically correct the fuel injection amount.