CN102691586B - Method for controlling diesel oil-alternative fuel engine limited substitution rate by using mean-square deviation and first-order and second-order derivative of mean-square deviation - Google Patents
Method for controlling diesel oil-alternative fuel engine limited substitution rate by using mean-square deviation and first-order and second-order derivative of mean-square deviation Download PDFInfo
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- CN102691586B CN102691586B CN201210205384.1A CN201210205384A CN102691586B CN 102691586 B CN102691586 B CN 102691586B CN 201210205384 A CN201210205384 A CN 201210205384A CN 102691586 B CN102691586 B CN 102691586B
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- 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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a method for judging a diesel oil-alternative fuel engine limited substitution rate, and belongs to the technical field of engineering. The method comprises is characterized in that an exhaust temperature sensor is additionally arranged on a diesel oil-alternative fuel double fuel (gas fuel and alcohol fuel) engine; a speed fluctuation rate or an exhaust temperature is used as a monitoring parameter of an electrical control unit; whether the monitoring parameter has mutation or not is judged through the mean-square deviation and the first-order and second-order derivatives of the mean-square deviation; when the mutational site is reached, the electrical control unit controls an alternative fuel injector to reduce the fuel alternative fuel injection quantity and continues the parameter monitoring and judgment of the next cycle; when the monitoring parameter is stable, the electrical control unit controls the alternative fuel injector to try increasing the alternative fuel and continuously judges the change of the monitoring parameter; and in this way, the alternative fuel is controlled repeatedly to reach an dynamic balance of an optimal substitution rate. The method can be used for both reducing the test working quantity, is not influenced by an engine fuel injection system, and is applicable for any control for obtaining an optimal substitution rate of a diesel oil-alternative fuel hybrid combustion engine which can combust with the diesel oil in hybrid.
Description
Technical field
The invention belongs to Engineering Control field, be particularly useful for the electronic control system that diesel oil-alternative fuel (comprising gaseous fuel and Aalcohols fuel) mixed combustion motor obtains limit substitution rate.
Background technique
Diesel fuel price increases day by day, commodity petroleum resource reduces day by day, people constantly seek on existing motor, under not changing the prerequisite of motor basic structure, install the control module of alternative fuel additional, adopt diesel oil and alternative fuel to mix burning, meet power character, reliability, Economy, the feature of environmental protection requirement prerequisite under, improve the ratio of diesel oil substitute to greatest extent, i.e. so-called " substitution rate ", to reduce the demand of motor to diesel oil.Described alternative fuel can be rock gas, alcohols and other be applicable to the fuel mixing burning with diesel oil.
When burning mixed by diesel oil and alternative fuel, because the calorific value of alternative fuel and chemical characteristics and diesel oil are not quite similar, pass through verification experimental verification, when mix burn substitution rate be increased to combustion process is worsened time, the fluctuation of speed amplitude of motor can be caused to increase, delivery temperature starts sudden change, and substitution rate is now the limit substitution rate under this engine operating condition.Diesel oil-alternative fuel is so far mixed and is burnt motor and all adopt and demarcate out by the limit substitution rate of Under Different Work Condition of Engine by the method for test on threst stand, make arteries and veins spectrum (MAP) figure, for controlling alternative fuel emitted dose.There are two kinds of drawbacks in such method, one is that often kind of type must obtain arteries and veins spectrogram by a large amount of stand tests, and cost is high and time-consuming; Two is when diesel fuel injection system deterioration, same pump rack position, its fuel injection quantity can reduce decline with atomization quality, originally the new engine diesel combustion shortage of heat corresponding to rack position of demarcating is to make same ratio alternative fuel Thorough combustion, and then engine stabilization is deteriorated, even cause flame-out or pinking.Therefore, the real-time control method finding a kind of dynamic judgement limit substitution rate is needed.
Summary of the invention
The present invention, according to the demand of technical background, as shown in Figure 1, the diesel oil-alternative fuel duel fuel engine with ECU (Electrical Control Unit) installs exhaust gas temperature sensor additional.In stand test process, tester is by listening engine sound, observing engine speed fluctuations and arranging warm situation of change, determines the limit substitution rate of each operating mode.As shown in Figure 2, when alternative fuel mixed-fuel burning proportion hour, engine speed fluctuations is in plateau; When alternative fuel mix burning reach the limit of substitution rate point " A " time, the speed fluctuation rate of motor starts to suddenly change afterwards at point " A ".Usually by an alternative fuel scale smaller percentage at point " A " place, then the limit substitution rate of this operating point is decided to be.Thus, make limit substitution rate arteries and veins spectrum by the rating test of test-bed, for ECU control.The monitoring parameter that the present invention is limit substitution rate institute foundation with speed fluctuation rate and delivery temperature, according to the research to Fig. 2 and arteries and veins spectrum rating test process, realize the key of the Dynamic controlling limit substitution rate demarcating arteries and veins spectrogram without the need to pretest, will design a kind of method for ECU, as discontinuity in artificial judgment Fig. 2 on test-bed " A ", automatic decision speed fluctuation rate and delivery temperature discontinuity, final adaptive control limit substitution rate.The technological scheme that the present invention proposes is, the mean square deviation changed according to engine speed fluctuations rate and row's temperature and single order, second dervative, the limit substitution rate under the various operating mode of real-time judgment.4 math equations below concrete employing:
1. mean value, adopts the method for first in first out, carries out mathematical statistics, during each computation of mean values, get into nearest data for n+1 data
, take out data the earliest
after, sue for peace and average.
Formula:
-speed fluctuation rate or delivery temperature.
the mean value of-speed fluctuation rate or delivery temperature.
2. mean square deviation, the difference of each data and mean square mean, be used for measuring the departure degree become between parameter and its average.
Formula:
-speed fluctuation rate or delivery temperature
with mean value
difference square.
the mean square deviation of-speed fluctuation rate or row's temperature.
3. mean square deviation first derivative, reflection mean square deviation slope of a curve, judges increasing progressively or successively decreasing of mean square deviation data and curves.
Formula: obtain front cycle mean square deviation according to mean square deviation formula
with this cycle mean square deviation
.
-mean square deviation first derivative.
4. mean square deviation second dervative, the concavity and convexity of reflection data and curves, judges the steep increasing of data or suddenly subtracts.
Formula:
-front cycle mean square deviation first derivative.
-this cycle mean square deviation second dervative.
On the basis of above 4 math equations, the decision method of monitoring parameter (speed fluctuation rate and delivery temperature) the curve discontinuity of limit substitution rate institute of the present invention foundation is proposed:
When the mean square deviation first derivative of speed fluctuation rate or delivery temperature is greater than 0, and its mean square deviation second dervative is greater than 0, then Detection curve starts to occur suddenly to increase sudden change, the mean square deviation first derivative of rear one-period is greater than 0, show that the sudden change of curve is still in increase, the discontinuity of monitoring parameter curve when limit substitution rate occurs is defined as by this point, ECU controls alternative fuel sparger and the emitted dose of the alternative fuel of this some correspondence is reduced △ %, then the parameter monitoring continuing next circulation judges, if do not have monitored parameter curve to suddenly change to occur, this emitted dose is the emitted dose of limit substitution rate, otherwise continue to subtract emitted dose △ % until speed fluctuation rate or exhaust temperature curve revert to stable transition point.
When speed fluctuation rate or exhaust temperature curve steady time, ECU (Electrical Control Unit) controls alternative fuel sparger and attempts increasing alternative fuel, continue the change judging engine speed fluctuations rate or delivery temperature, and so forth, control the transient equiliblium that alternative fuel reaches best substitution rate point in real time.
Accompanying drawing explanation
Fig. 1 is horse structure of the present invention: 1-ECU (Electrical Control Unit), 2-exhaust gas temperature sensor, 3-speed probe, 4-diesel oil-alternative fuel motor.
The curve that when Fig. 2 is stand test, monitored parameter changes with substitution rate: A-discontinuity.
Fig. 3 is the data verification of the inventive method: the variance ratio of serial 1-rotating speed, serial 2-mean square deviation, serial 3-mean square deviation first derivative, serial 4-mean square deviation second dervative.
Embodiment
According to the alternative fuel point decision method of the technological scheme of summary of the invention, math equation, limit substitution rate, former diesel oil-alternative fuel motor installs exhaust gas temperature sensor additional, former automatical control system equips speed probe.For engine speed fluctuations rate, implement according to following steps:
The speed fluctuation rate (N) of the collection motor of 1.ECU fixed cycle t, after taking fully enough sample size n sample range, adopts the method for first in first out to calculate the speed fluctuation rate mean value (N_ave) in a up-to-date n cycle.
2. calculate square (Square) of the speed fluctuation rate (N) in this cycle and the difference of speed fluctuation rate mean value (N_ave), namely
，
3. calculate the mean value of square (Square) of a nearest n periodic inequality, be the mean square deviation Square_ave in this cycle, namely
，
4. ECU (Electrical Control Unit) preserves the mean square deviation (Square_ave_1) in front cycle, the mean square deviation (Square_ave_2) in front cycle, calculates mean square deviation first-order value Derivative_One, namely
Derivative_One = Square_ave- Square_ave_1，
5. calculate mean square deviation second order value (Derivative_Two), namely
Derivative_Two = Square_ave - (2* Square_ave_1) + Square_ave_2，
The data N in nearest 11 cycles, Square_ave, Derivative_One, Derivative_Two are carried out graphic analyses discovery, as shown in Figure 3, from abscissa point 5, series 1-fluctuation of speed rate curve starts to become large, series 2-mean square deviation curve starts to increase progressively, the first derivative of series 3-mean square deviation is greater than 0, series 4-mean square deviation second dervative is greater than 0, the abscissa point 6,7,8,9,10,11 of the first derivative of serial 3-mean square deviation continues to be greater than 0 again, shows that speed fluctuation rate increases progressively continuously from point 5.
6, according to above analysis principle, the first derivative of mean square deviation is greater than 0, and the second dervative of its mean square deviation is greater than 0, and the mean square deviation first derivative in cycle is greater than 0 subsequently, is classified as the criterion of the fluctuation of speed rate curve discontinuity of limit substitution rate institute foundation.ECU (Electrical Control Unit) judges that mixing fuel burning is increased to the limit making burn deterioration thus, controls alternative fuel sparger and subtracts emitted dose △ %, make speed fluctuation rate curvilinear regression to stable transition point.
7, when rotating speed is steady, ECU (Electrical Control Unit) controls alternative fuel sparger and attempts increasing alternative fuel, continues the change judging engine speed fluctuations rate or delivery temperature, and so forth, controls the transient equiliblium that alternative fuel reaches best substitution rate point in real time.
By Fig. 2 and Fig. 3 contrast verification, it is consistent for searching out limit substitution rate point with stand artificial judgment limit substitution rate point by method of the present invention, and can control in real time under any operating mode.
The determination methods of exhaust temperature curve discontinuity is the same with the method that above-mentioned speed fluctuation rate is suddenlyd change, and does not repeat at this.Be verified in stand test and real machine run according to the embodiment of the present invention.
Claims (1)
1. one kind controls the method for diesel oil-alternative fuel Engine Limit substitution rate by mean square deviation and single order thereof and second dervative, it is characterized in that: in former diesel oil-alternative fuel electrical control system for engine, install exhaust gas temperature sensor additional, with speed fluctuation rate and delivery temperature for monitoring parameter, by ECU (Electrical Control Unit) ECU to the monitoring of monitoring parameter and the control to alternative fuel sparger, realize dynamic in real time searching and control limit substitution rate point, wherein, alternative fuel refers to gaseous fuel or Aalcohols fuel, and the determination methods of limit substitution rate point is:
If the first derivative of the mean square deviation of arbitrary monitoring parameter is greater than 0, and the second dervative of its mean square deviation is greater than 0, and the mean square deviation first derivative in cycle is greater than 0 subsequently, and ECU (Electrical Control Unit) judges that now substitution rate reaches capacity thus;
When being in limit substitution rate, ECU (Electrical Control Unit) controls the ratio that alternative fuel sparger reduces alternative fuel, and speed fluctuation rate or row's temperature are tended to be steady again;
When speed fluctuation rate or row's temperature steadily time, ECU (Electrical Control Unit) controls alternative fuel sparger and attempts increasing alternative fuel, continue the change judging engine speed fluctuations rate or delivery temperature, and so forth, control the transient equiliblium that alternative fuel reaches best substitution rate point in real time;
Wherein, described mean square deviation be the difference of each monitoring parameter and monitoring parameter mean value square mean, the departure degree be used between monitoring metrics parameter and its average;
Formula:
-monitoring parameter
with mean value
difference square;
the mean square deviation of-monitoring parameter;
Wherein, the mean value of detected parameters adopts the method for first in first out, carries out mathematical statistics, during each computation of mean values, get into nearest data for n+1 monitoring parameter
, take out data the earliest
after, sue for peace and average;
Formula:
-monitoring parameter;
the mean value of-monitoring parameter;
Wherein, described mean square deviation first derivative, reflection mean square deviation slope of a curve, judges increasing progressively or successively decreasing of mean square deviation data and curves;
Formula: obtain front cycle mean square deviation according to mean square deviation formula
with this cycle mean square deviation
;
-mean square deviation first derivative;
Wherein, described mean square deviation second dervative, the concavity and convexity of reflection data and curves, judges the steep increasing of data or suddenly subtracts;
Formula:
-front cycle mean square deviation first derivative;
-this cycle mean square deviation second dervative.
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| CN201210205384.1A CN102691586B (en) | 2012-06-21 | 2012-06-21 | Method for controlling diesel oil-alternative fuel engine limited substitution rate by using mean-square deviation and first-order and second-order derivative of mean-square deviation |
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| CN201210205384.1A CN102691586B (en) | 2012-06-21 | 2012-06-21 | Method for controlling diesel oil-alternative fuel engine limited substitution rate by using mean-square deviation and first-order and second-order derivative of mean-square deviation |
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| CN102691586B true CN102691586B (en) | 2015-06-17 |
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| CN105443251B (en) * | 2015-12-04 | 2017-11-14 | 长安大学 | A kind of automobile-used automatically controlled methanol diesel-oil dual fuel engine fuel supply control method |
| CN113027620B (en) * | 2021-04-12 | 2023-01-24 | 潍柴动力股份有限公司 | Engine fuel substitution rate control method and device and engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229946A (en) * | 1991-08-19 | 1993-07-20 | Motorola, Inc. | Method for optimizing engine performance for different blends of fuel |
| CN1573070A (en) * | 2003-05-21 | 2005-02-02 | 本田技研工业株式会社 | Failure diagnosis apparatus for evaporative fuel processing system |
| CN102022196A (en) * | 2010-12-07 | 2011-04-20 | 东莞传动电喷科技有限公司 | Controller of novel alternative fuel internal combustion engine |
| CN102465773A (en) * | 2010-11-17 | 2012-05-23 | 西安申科电子研究所 | Multi-fuel control system of automobile |
-
2012
- 2012-06-21 CN CN201210205384.1A patent/CN102691586B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229946A (en) * | 1991-08-19 | 1993-07-20 | Motorola, Inc. | Method for optimizing engine performance for different blends of fuel |
| CN1573070A (en) * | 2003-05-21 | 2005-02-02 | 本田技研工业株式会社 | Failure diagnosis apparatus for evaporative fuel processing system |
| CN102465773A (en) * | 2010-11-17 | 2012-05-23 | 西安申科电子研究所 | Multi-fuel control system of automobile |
| CN102022196A (en) * | 2010-12-07 | 2011-04-20 | 东莞传动电喷科技有限公司 | Controller of novel alternative fuel internal combustion engine |
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Address after: 212009 Zhenjiang city of Jiangsu province science and Technology Park pan Zong Lu 38-4 Dingmao Patentee after: Hengchi Science & Technology Co., Ltd., Zhenjiang Address before: 212009 room 668, No. 12, 201, Jiangsu, Zhenjiang, China Patentee before: Hengchi Science & Technology Co., Ltd., Zhenjiang |
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Effective date of registration: 20201119 Address after: Room 101, 201, 301, 401, 501, Building 158, Xinsheng Road, Chongchuan District, Nantong City, Jiangsu Province Patentee after: Nantong Quanchang Power Technology Co.,Ltd. Address before: 212009 Zhenjiang city of Jiangsu province science and Technology Park pan Zong Lu 38-4 Dingmao Patentee before: HENTS TECHNOLOGIES Inc. |