CN100467844C - Dynamic closed-loop control method of minitype engine - Google Patents
Dynamic closed-loop control method of minitype engine Download PDFInfo
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- CN100467844C CN100467844C CNB2006101187203A CN200610118720A CN100467844C CN 100467844 C CN100467844 C CN 100467844C CN B2006101187203 A CNB2006101187203 A CN B2006101187203A CN 200610118720 A CN200610118720 A CN 200610118720A CN 100467844 C CN100467844 C CN 100467844C
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Abstract
The invention relates to a dynamic closed-loop control method of small engine, wherein, at non-full-load state, the output voltage neutral value of oxygen sensor is set as 0.45V; the over air factor lambada can control the fuel injection time in closed-loop; the factor lambada is limited around 1; when the engine is in full load, the output voltage neutral value of oxygen sensor is set at 0.85V, in the closed-loop control of factor lambada, the fuel injection time can be adjusted to hold the over air factor lambada around the dense fuel. The invention can realize the dynamic closed-loop control of over air factor lambada, to be used in small engine and wind-cold small engine, to obtain thermal protection at full load condition and confirm the highest power output.
Description
Technical field
The present invention relates to a kind of fuel injection control method of mini engine electric injection system, particularly relate to a kind of mini engine that is applicable to and especially adopt the dynamic closed-loop control method of air-cooled mini engine.
Background technique
Since the sixties in last century, people more and more recognize the significance of environmental protection, thereby the rules of restricting vehicle exhaust emissions are also severe day by day.When adopting various emission controls by improving combustion measures all can't reach the waste-gas cleaning requirement, external purification provides the another one new scheme.So exhaust gas catalytic converter arises at the historic moment.
The noxious pollutant of gasoline exhaust mainly is HC (hydrocarbon), CO (carbon monoxide) and NO
x(oxynitrides).The most important thing is to utilize triple effect catalytic converter to purify at present in the gasoline exhaust pollutant control means.The concentration of the waste gas harmful matter after the purification and the air excess factor of fuel oil and air Mixture are closely related.Only being 0.99～1.00 one in air excess factor just can make these three kinds of harmful matters be purified to greatest extent simultaneously among a small circle.The target of air excess factor closed loop control is controlled air excess factor exactly and is changed in target zone.
At present petrol engine under the full load operating mode in order to reach maximum power, employing be λ open loop control.And bigger because of the scattered error in the batch production process for mini engine, the motor oil spout can't reach accurate control under air excess factor open loop control.Can cause that piston is overheated under the rare excessively situation of fuel oil concentration, particularly for taking air-cooled mini engine, internal heat can only could arrive extraneous by transmission gradually between the parts and radiation, and this just might cause motor badly damaged.
Summary of the invention
The technical problem to be solved in the present invention is by the closed loop control to air excess factor; a kind of dynamic closed-loop control method of minitype engine is provided; make mini engine especially adopt air-cooled mini engine under the full load operating mode, to obtain the heat protection, guarantee the peak output output of motor simultaneously.
For solving the problems of the technologies described above, dynamic closed-loop control method of minitype engine of the present invention comprises the steps:
At first carry out the judgement of engine operating condition, judge by throttle opening and engine speed whether motor is in full load condition; When non-full load condition, set the output voltage neutral value of lambda sensor, adjust injection time by the air excess factor closed loop control, air excess factor is defined as " 0.99～1.00 "; When motor is in full load condition, set the voltage neutral value of lambda sensor, in the air excess factor closed loop control, control air excess factor by adjusting injection time.
According to the voltage characteristic of two point form lambda sensor (referring to Fig. 1) as can be known, when air excess factor＜1, the voltage of lambda sensor is 0.8～1.0V; When air excess factor〉1 the time, the voltage of lambda sensor is less than 0.1V; When air excess factor=1, the voltage of lambda sensor is 0.45～0.5V.In the non-full load operating mode of motor, can set the oxygen sensor voltage neutral value by the air excess factor closed loop control is 0.45 volt, thereby air excess factor be controlled near 1 one among a small circle in (being that λ is 0.99～1.00), to reach best emission purification efficient.In the full load operating mode, also can be set at 0.85 volt to the oxygen sensor voltage neutral value by the air excess factor closed loop control, so air excess factor be controlled in fuel oil concentration dense partially one among a small circle in, both avoided the engine piston temperature too high, guaranteed also that motor can Maximum Power Output simultaneously.
The output voltage characteristic of two point form lambda sensor also is subjected to temperature effect simultaneously.As shown in Figure 1, the output voltage of lambda sensor reduces along with the rising of temperature.Temperature is high more, and the pairing air excess factor value of same output voltage is low more, and mixed gas intermediate fuel oil concentration is also just high more.
Fig. 2 shown in delivery temperature and reached 640 ℃, and λ closed loop control voltage neutral value is when being set at 0.85 volt, the output voltage of two point form lambda sensor and the actual change curve that records the air excess factor value.Wherein XUSOND/ETKC is the output voltage of two point form lambda sensor, xusond mean is the voltage neutral value, LA4:1_Lambda_Word/LA4 is the air excess factor value that continuous oxygen sensor reality is measured, and lambda_mean is the mean value of air excess factor.As can be seen from the figure, keep two point form lambda sensor output voltage when 0.85 volt of neutral value fluctuates up and down when the λ closed loop control, the air excess factor value is controlled in mean value 0.9 and changes up and down.Cause damage thereby engine temperature is too high when having avoided lean combustion, realized the heat protection of motor, also guaranteed the peak output output of motor simultaneously.
Fig. 3 shown in delivery temperature and reached 460 ℃, when λ closed loop control voltage neutral value is set at 0.85 volt equally, and the output voltage of two point form lambda sensor and the actual change curve that records the air excess factor value.
As seen from the figure, when the λ closed loop control is kept two point form lambda sensor output voltage when 0.85 volt of neutral value changes up and down, the air excess factor value is controlled in 0.95 fluctuation up and down.Utilize the temperature variant characteristic of two point form lambda sensor output voltage like this, when delivery temperature is low, made mixed gas intermediate fuel oil concentration unlikely too high, promptly taken into account oil consumption, also avoided the too high problem that causes infringement of engine piston temperature simultaneously.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the voltage characteristic curve of two point form lambda sensor;
Fig. 2, Fig. 3 are the output voltage and the actual change curves that records the air excess factor value of two point form lambda sensor;
Fig. 4 is a control flow chart of the present invention.
Embodiment
Dynamic Closed Loop Control of the present invention; be meant under the different situation of engine load,, air excess factor changed in different target zones by closed loop control to air excess factor; thereby can take into account discharging, the requirement of several respects is exported and engine thermal is protected to power.
During λ open loop control, ECU (electronic control unit) does not know the actual effect after the final controlling element execution command.And ECU carries out the variation of back air excess factor by the sensor monitors instruction during λ closed loop control, and with the measured value and setting value contrast of λ, adjusts instruction and make it to reach unanimity when both are inconsistent.
As shown in Figure 4, when motor moved, ECU judged according to current engine parameter (throttle opening wdk, engine speed n) whether motor is in operating mode at full capacity, and concrete determination methods is:
If wdk〉WDKVL (N) B_vl=ture;
Otherwise B_vl=false;
Wherein: wdk is: throttle opening; N is: engine speed; WDKVL (N) is: with the threshold value of the throttle opening of engine speed change; B_vl is: full load flag bit, B_vl=ture represent that motor is in operating mode at full capacity, and B_vl=false represents that motor is in non-full load operating mode.
If right and wrong are operating mode at full capacity, the voltage neutral value VSR (being the control target value of two point form lambda sensor in the λ closed loop control) of λ closed loop control is set at 0.45 volt, λ closed loop control this moment will injection time is feasible to be controlled near 1.0 through the air excess factor in the waste gas behind the engine combustion by adjusting, thereby waste gas is farthest purified by triple effect catalytic converter, reach the purpose of optimizing discharging.Control under this operating mode is identical with λ controlling method in conventional EMS (engine management system) system.
If the full load operating mode, then the voltage neutral value VSRVL (being the control target value of two point form lambda sensor in the λ closed loop control) with the λ closed loop control is set at 0.85 volt.λ closed loop control this moment will be controlled air excess factor by adjusting injection time, thereby make motor obtain best power performance.And air excess factor with row's temperature of motor different and difference to some extent, shown in Fig. 2,3, if when delivery temperature is 640 ℃, then air excess factor will be controlled near 0.9; If when delivery temperature was 400 ℃, then air excess factor was controlled near 0.95.This shows; closed loop control at full capacity can be controlled at suitable scope to air excess factor to obtain best engine power performance; while is along with the rising of engine exhaust temperature; ECU can reduce air excess factor (increasing the concentration of fuel oil in mixed gas) automatically, thereby effectively the component of motor is implemented overtemperature protection.
Engine temperature is too high when having avoided burning like this, can guarantee also that simultaneously motor can Maximum Power Output; In actual ECU control, the parameter of the voltage neutral value of lambda sensor for mating can be set different voltage neutral value according to different motors, thereby control air excess factor value changes in target zone.
In addition, for different projects, the scope of air excess factor may be different when obtaining the best full load of motor power performance.By adjusting the value of VSRVL, can satisfy the requirement of disparity items.Also VSRVL can be designed to simultaneously the arteries and veins spectrum that changes with engine operating condition, such as VSRVL (n, wdk).Can realize that like this neutral value of air excess factor can seamlessly transit when engine operating condition switches between full load and non-full load.
Claims (5)
1, a kind of dynamic closed-loop control method of minitype engine is characterized in that comprising the steps: at first to carry out the judgement of engine operating condition, judges by throttle opening and engine speed whether motor is in full load condition; When non-full load condition, set the output voltage neutral value of lambda sensor, adjust injection time by the air excess factor closed loop control, air excess factor is defined as " 0.99～1.00 "; When motor is in full load condition, set the voltage neutral value of lambda sensor, in the air excess factor closed loop control, control air excess factor by adjusting injection time.
2, dynamic closed-loop control method of minitype engine according to claim 1 is characterized in that: when non-full load condition, the output voltage neutral value of setting lambda sensor is 0.45 volt.
3, dynamic closed-loop control method of minitype engine according to claim 1 is characterized in that: when motor was in full load condition, the voltage neutral value of setting lambda sensor was 0.85 volt.
4, dynamic closed-loop control method of minitype engine according to claim 1 is characterized in that: when motor was in full load condition, the voltage neutral value of setting lambda sensor was the arteries and veins spectrum that changes with engine operating condition.
5, dynamic closed-loop control method of minitype engine according to claim 1 is characterized in that: judge whether be at full capacity by motor the method for operating mode is:
If wdk〉WDKVL (N) B_vl=ture;
Otherwise B_vl=false;
Wherein: wdk is: throttle opening; N is: engine speed; WDKVL (N) is: with the threshold value of the throttle opening of engine speed change; B_vl is: full load flag bit, B_vl=ture represent that motor is in operating mode at full capacity, and B_vl=false represents that motor is in non-full load operating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101187203A CN100467844C (en) | 2006-11-24 | 2006-11-24 | Dynamic closed-loop control method of minitype engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101187203A CN100467844C (en) | 2006-11-24 | 2006-11-24 | Dynamic closed-loop control method of minitype engine |
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| CN101008360A CN101008360A (en) | 2007-08-01 |
| CN100467844C true CN100467844C (en) | 2009-03-11 |
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| CNB2006101187203A Expired - Fee Related CN100467844C (en) | 2006-11-24 | 2006-11-24 | Dynamic closed-loop control method of minitype engine |
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| CN106285985A (en) * | 2016-09-30 | 2017-01-04 | 广州汽车集团股份有限公司 | Petrol engine excess air coefficient method for controlling combustion and combustion control system |
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Granted publication date: 20090311 Termination date: 20201124 |