CN101054933A - Electronic carburetor oil-supply system - Google Patents
Electronic carburetor oil-supply system Download PDFInfo
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- CN101054933A CN101054933A CN 200710017834 CN200710017834A CN101054933A CN 101054933 A CN101054933 A CN 101054933A CN 200710017834 CN200710017834 CN 200710017834 CN 200710017834 A CN200710017834 A CN 200710017834A CN 101054933 A CN101054933 A CN 101054933A
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- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Abstract
An electronic-controlled carburettor oil supply system includes a carburettor, an engine, a crankshaft position signal flip flop equipment is arranged on the engine, a crankshaft position sensor corresponding to the crankshaft position signal flip flop equipment is also arranged outside the engine, the output end of the crankshaft position sensor is connected to the input end of the electronic control unit, and an exhaust oxygen sensor connecting to the input end of the electronic control unit is arranged on the exhaust pipe of the engine, an electromagnet valve connecting to the electronic control unit is arranged on the low speed oil array air channel of the carburettor. The electronic control unit of the invention performs feedback control based on the theory air fuel ratio by the crankshaft position signal generated in the crankshaft position sensor and oxygen content detected by the exhaust oxygen sensor, and detects this bias by the oxygen sensor, and opening of the electromagnet valve can be adjusted based on the bias, thereby adjusting air fuel ratio of the engine under middle and small load operating condition, until the air fuel ratio of the engine is close to the theory air fuel ratio.
Description
Technical field
The present invention relates to the displacement gasoline engine oil supply system, relate in particular to a kind of electronic carburetor oil-supply system of applying electronic control technique design.
Background technique
Environmental pollution and energy shortage have become two big crises of the world today, are seriously threatening the existence of whole human society, so green technology and power-saving technology have become the problem of a sternness.Along with human living standard's raising, people's environmental consciousness improves constantly and the minimizing day by day of petroleum resources, and people have higher requirement to Economy, exhaust index and the driving comfortability of petrol engine.
Displacement gasoline engine also is extensive use of Carburetor at present as its oil supply system, and Carburetor plays critical effect to the performance of displacement gasoline engine.Carburetor is divided into by principle: plunger type, register type, vacuum plunger type, vacuum plunger register type etc., and wherein most widely used general with plunger type carburetor and vacuum plunger register type Carburetor.Its basic structure: control system, oil-feed system, cold-start system, low speed oil supply system (hereinafter to be referred as low speed oil system), high speed oil supply system (being) hereinafter to be referred as oily at a high speed.
For plunger type carburetor, the oil door handle of motor is connected by acceleration cable with the plunger of Carburetor, during the throttle action, regulate inlet air amount and the oil inlet quantity that Carburetor plunger height changes motor, thereby change the operating conditions of motor by backguy.
Oil-feed system: form by oil inlet pipe, oil-feed valve seat, needle, float, oil spill pipe, the screw of draining the oil, drain line, balance tube etc.
Low speed oil system: low speed oil system is made up of pilot running nozzle, idling Air Adjust Screw, plunger or throttle adjust screw, low speed oil outlet etc.In the throttling action of idling operation (the plunger aperture is very little) owing to plunger or closure, low speed oil outlet place forms than higher degree of vacuum.Fuel oil in the float chamber through low speed oil be the fuel oil metering-orifice to enter low speed oil be the fuel gallery, and be the air of air passageways from low speed oil, in the foam tube of pilot running nozzle front end, mix, enter mixing chamber again, be that spout enters suction tude through low speed oil at last.According to the situation of motor, can regulate the concentration of mixed gas by the idling Air Adjust Screw.General clockwise transferring in, the compensation rate of air reduces in the low speed system, and fuel delivery increases, and mixed gas thickens; On the contrary, access lean out counterclockwise.The height of idling speed mainly changes idling inlet air amount by the position of plunger or throttle adjust screw pilot plunger or closure, thereby changes the engine idle rotating speed.General clockwise transferring in, plunger position are improved or throttle opening increases, and engine speed raises; Access counterclockwise, plunger position reduces or throttle opening reduces, and engine speed descends.
Oil is at a high speed: be made up of primary air metering-orifice, main jet, main foam tube, main jet pipe, main spindle etc.
When motorcycle is started to walk by idling operation, that is to say when drawing throttle, directly or indirectly cause plunger position to raise, raising along with plunger, the degree of vacuum that is the oil outlet place at a high speed progressively increases, system also participates in fuel feeding at a high speed, fuel oil in the float chamber is through main jet, in main foam tube with from the air mixing of primary air metering-orifice, endless belt through main spindle and main jet pipe sprays in the mixing chamber again, that is to say the raising along with plunger, low speed oil is that the fuel-displaced ratio that accounts for total fuel feeding progressively reduces, and high speed oil is that the fuel feeding ratio progressively increases.
The same control system, oil-feed system, low speed oil system, the high speed oil system etc. of all comprising of vacuum plunger register type Carburetor with plunger type carburetor.Low speed oil system is different with plunger type carburetor is that its oil outlet is arranged on closure and is in the approaching position of closing.Oil system compares with plunger type carburetor at a high speed, has increased elastomer diaphragm.Moving up and down of the plunger of plunger type carburetor produced by the acceleration cable direct pull, and the effect of the degree of vacuum at variable venturi place under the plunger is leaned in moving up and down of the plunger of vacuum plunger type carburetor.When motorcycle was started to walk, throttle opening progressively increased, and the degree of vacuum under the vacuum plunger progressively improves.When degree of vacuum was increased to the elastic force of the deadweight that is enough to obey the vacuum plunger and piston spring, the vacuum plunger was picked up.Because piston spring compression back force variation is very little, so the degree of vacuum at variable venturi place approximately constant under the part operating mode, therefore the Carburetor of this structure is known as constant-depression carburetor again.Owing to the effect of vacuum plunger, improved the transiting performance of motorcycle.It is bigger that the mixing chamber of Carburetor can design, and helps improving the high speed performance of motorcycle.
Bleed exhaust in outlet pipe from suction tude during the motor operation.In suction tude, form certain degree of vacuum.Carburetor is by the distribution of control degree of vacuum, and through the metering of ingredients element, the fuel oil in the float chamber is drawn in the firing chamber of motor.The motorcycle engine oil supply system is in the using process of reality, and the motorcycle driving operating mode is very complicated: cold starting, idling, acceleration, deceleration, descending, upward slope etc.Carburetor is controlled the proportions of ingredients (air fuel ratio) of the required air quantity of each operating mode and air and fuel oil.This traditional mechanical formula structure Carburetor, for a certain specific operation, air fuel ratio is fixed.If change its numerical value, must adjust structural parameter.But the adjustment of structural parameter certainly will influence the air fuel ratio of other operating mode.Therefore, the needs of determining to satisfy fully each operating point of this carburetor structure parameter must be taken all factors into consideration.Factory reaches the more and more requirement of the Abgasgesetz of strictness in order to make engine exhaust emission, as state II, state III standard, must accurately control the air fuel ratio of engine operation according to the operating mode of motor.Reach this requirement, will guarantee the power character and the good economy performance of motor simultaneously, must propose very high requirement the precision of main measuring element in the design of Carburetor and the manufacture process.With regard to the structure of small displacement engine Carburetor owing to be subjected to the restriction of its cost, can not be as the structure of motor car engine complicated design, so the structure of small displacement engine Carburetor is generally fairly simple, as described above.Just present manufacturing level, the part of producing does not reach permissible accuracy, and has certain scattered error.For above-mentioned Carburetor, general its oily at a high speed system is working stability than low speed oil and is easy to realize comparing high control precision, and for being that the main operating conditions of main application small displacement engine all is in medium and small load condition with motorcycle, therefore improving stability and the control accuracy that Carburetor low speed oil is work is very important for improving engine performance.Therefore, electron controls technology being used on Carburetor, is the effective way that solves motorcycle emission, power character, Economy and driving comfortability.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of and can accurately control air fuel ratio, make small displacement engine can satisfy the electronic carburetor oil-supply system of emission regulation demands to improve the performance of motor in medium and small load condition operation.
For achieving the above object, the technical solution used in the present invention is: comprise Carburetor and the motor that is connected with Carburetor, be characterized in, the crankshaft-position signal flip flop equipment is installed on motor, and also be equipped with and the corresponding crankshaft position sensor of crankshaft-position signal flip flop equipment in the motor outside, the output terminal of crankshaft position sensor is connected with the input end of electronic control unit, and also being provided with the exhaust gas oxygen sensor that is connected with the input end of electronic control unit in waste pipe, is that the air passageways place is provided with a solenoid valve that is connected with electronic control unit at the low speed oil of Carburetor.
Also be provided with an air jet in parallel in the low speed oil system of Carburetor of the present invention with solenoid valve; The acceleration cable of Carburetor or plunger place also are provided with a load sensor that is connected with electronic control unit, and perhaps the suction tude of motor also is connected with load sensor, and described load sensor is connected with electronic control unit.
Because it is the feedback control of target that electronic control unit of the present invention is undertaken with the chemically correct fuel by the oxygen content that produces crankshaft-position signal and exhaust gas oxygen sensor detection in the crankshaft position sensor, detect this deviation by lambda sensor, and according to the aperture of this deviation adjustment solenoid valve, regulate the air quantity that enters low speed oil system, thereby regulate the air fuel ratio of motor when medium and small load condition, until the air fuel ratio approximation theory air fuel ratio of engine operation.
Description of drawings
Fig. 1 is the overall structure schematic representation of plunger type carburetor.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail, but the present invention is not limited to following examples.
Embodiment 1, referring to Fig. 1, the present invention includes Carburetor 2, the inlet of Carburetor 2 is connected with fuel pipe 1, Carburetor 2 links to each other with motor 6 by suction tude 14, crankshaft-position signal flip flop equipment 8 is installed on motor 6, and also be equipped with and crankshaft-position signal flip flop equipment 8 corresponding crankshaft position sensors 9 in the motor outside, the output terminal of crankshaft position sensor 9 is connected with the input end of electronic control unit (ECU) 10, and returning apparatus has the exhaust gas oxygen sensor 11 that is connected with electronic control unit 10 in the outlet pipe 16 of motor 6, low speed oil at Carburetor 2 is that the ingress is provided with a solenoid valve 5 that is connected with electronic control unit 10, also be provided with an air jet 3 in parallel in the low speed of the Carburetor 2 oil system with solenoid valve 5, even like this when solenoid valve 5 Close Alls, still have the small part air to infiltrate by this air jet 3, thereby improve the atomizing of the low speed oil system fuel oil that supplies, with improving low speed oil is the stability of fuel feeding, and the present invention also is communicated with a load sensor 15 that is connected with electronic control unit 10 on the suction tude 14 of motor 6.
Its working principle is as follows: on the basis of original Carburetor 2, and air passageways 4 in parallel on the basis of the air jet 3 of the low speed oil system of revising original Carburetor 2 by solenoid valve 5 controls,
When solenoid valve 5 is opened, low speed oil is that the infiltration capacity of air is flowed through air jet 3 and air passageways 4 and entered the low speed oil system of Carburetor 2, by low speed oil is that the fuel oil that enters of fuel oil metering-orifice 7 mixes after the low speed oil of Carburetor 2 is spout 13 flows out and the suction tude 14 that enters motor 6, the valid circulation area of air passageways 4 is adjusted by electronic control unit 10 controls in other words by effective aperture of solenoid valve 5, when effective aperture of solenoid valve 5 changes, the air infiltration capacity of the low speed oil system of Carburetor 2 changes, the amount of fuel that causes the low speed oil system of Carburetor 2 to supply with changes, thereby the proportions of ingredients (air fuel ratio) of mixture that enters the air fuel of motor 6 can change.Owing on the outlet pipe 16 of motor 6, exhaust gas oxygen sensor 11 has been installed, survey the air fuel ratio of motor 6 work, electronic control unit 10 is according to the aperture of the discrepancy adjustment solenoid valve 5 of the measured value of this exhaust gas oxygen sensor 11 and desired value, change the air fuel ratio of motor 6 work, approach target air-fuel ratio until the actual measurement air fuel ratio.Since exhaust gas oxygen sensor 11 on automobile extensive use, have the type of step output signal characteristics at theoretical air fuel ratio place, thereby target air-fuel ratio generally is chosen to be chemically correct fuel.
In order to improve the control performance of system, also be provided with a load sensor 15 in the system, this load sensor 15 can link to each other with acceleration cable 12 or be connected with the suction tude 14 of motor 6, for example this load sensor 15 can be throttle position sensor or intake pipe absolute pressure sensor, if applied load sensor, automatical control system can also utilize the aperture of engine speed and load open loop regulating and controlling solenoid valve, be combined in the feedback control of utilizing above-mentioned oxygen sensor signal to carry out of carrying out on this basis, can be more quickly, the air fuel ratio of work is controlled to be chemically correct fuel during accurately with the medium and small load of motor, thereby the service behaviour of motor is optimized, adopting three-way catalytic converter that tail gas is carried out to make under the situation of reprocessing motor to reach the requirement of following strict Abgasgesetz, simultaneity factor compact structure, simply; The open loop control basic controlling amount that this moment, electronic control unit 10 at first obtained solenoid valve 5 according to the load parameter and the rotary speed parameter of motor 6, on this basis, utilizing the signal of exhaust gas oxygen sensor 11 to carry out with the chemically correct fuel is the feedback control of target, obtain the feedback modifiers amount, the final output quantity of electronic control unit 10 control electromagnetic valve 5 is basic controlling amount and feedback modifiers amount sum.Mode by above-mentioned open loop control and close-loop feedback control combine can accurately be controlled to be target air-fuel ratio with air fuel ratio apace, improves the responsiveness of motor dynamic operation condition control.If cancellation load sensor 15, electronic control system will mainly be carried out close-loop feedback control according to engine speed and oxygen sensor signal, reduces the responsiveness of system, thereby reduces the dynamic control accuracy of system.
The present invention is equally applicable to vacuum plunger register type Carburetor etc.
Claims (4)
1, electronic carburetor oil-supply system, comprise Carburetor (2) and the motor (6) that is connected with Carburetor (2), it is characterized in that: crankshaft-position signal flip flop equipment (8) is installed on motor (6), and also be equipped with and the corresponding crankshaft position sensor of crankshaft-position signal flip flop equipment (8) (9) in motor (6) outside, the output terminal of crankshaft position sensor (9) is connected with the input end of electronic control unit (10), and also being provided with the exhaust gas oxygen sensor (11) that is connected with the input end of electronic control unit (10) on the outlet pipe (16) of motor (6), is that the air passageways place is provided with a solenoid valve (5) that is connected with electronic control unit (10) at the low speed oil of Carburetor (2).
2, electronic carburetor oil-supply system according to claim 1 is characterized in that: also be provided with an air jet (3) in parallel with solenoid valve (5) in the low speed oil system of said Carburetor (2).
3, electronic carburetor oil-supply system according to claim 1 is characterized in that: acceleration cable of said Carburetor (12) or plunger place also are provided with a load sensor (15) that is connected with electronic control unit (10).
4, electronic carburetor oil-supply system according to claim 1 is characterized in that: the suction tude (14) of said motor (6) also is connected with a load sensor (15), and this load sensor (15) is connected with electronic control unit (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017834 CN101054933A (en) | 2007-05-14 | 2007-05-14 | Electronic carburetor oil-supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017834 CN101054933A (en) | 2007-05-14 | 2007-05-14 | Electronic carburetor oil-supply system |
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| Publication Number | Publication Date |
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| CN101054933A true CN101054933A (en) | 2007-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710017834 Pending CN101054933A (en) | 2007-05-14 | 2007-05-14 | Electronic carburetor oil-supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678389A (en) * | 2012-03-23 | 2012-09-19 | 上海坤孚企业(集团)有限公司 | Separate control type carburetor for motorcycle engine |
| CN103174548A (en) * | 2011-12-21 | 2013-06-26 | 镇江中研电控有限公司 | Electronic control carburetor and control method of concentration of mixed gas |
-
2007
- 2007-05-14 CN CN 200710017834 patent/CN101054933A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174548A (en) * | 2011-12-21 | 2013-06-26 | 镇江中研电控有限公司 | Electronic control carburetor and control method of concentration of mixed gas |
| CN102678389A (en) * | 2012-03-23 | 2012-09-19 | 上海坤孚企业(集团)有限公司 | Separate control type carburetor for motorcycle engine |
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