CN103114951B - Controlling method of gasoline direct injection engine optimal ignition advance angle - Google Patents
Controlling method of gasoline direct injection engine optimal ignition advance angle Download PDFInfo
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- CN103114951B CN103114951B CN201210367238.9A CN201210367238A CN103114951B CN 103114951 B CN103114951 B CN 103114951B CN 201210367238 A CN201210367238 A CN 201210367238A CN 103114951 B CN103114951 B CN 103114951B
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Abstract
The invention discloses a controlling method of gasoline direct injection engine optimal ignition angular advance. The process of obtaining the optimal ignition angular advance is that a water inlet and outlet temperature of a motor, an air inlet temperature of a motor, air fuel ratio of a motor, altitude of an automobile, waste gas recirculation rate, variable air valve timing opening, a spraying mode and knocking controlling are logically operated after a base ignition angular advance is set. The base ignition angular advance is calculated and revised according to influences of the eight factors in sequence. The base ignition angular advance is revised through the influence of each factor, the ignition angular advance is controlled at the best time all the time no matter the motor is operated under any working condition and any environment, power performance, economy and discharging time of the motor are at the best state.
Description
Technical field
The present invention relates to engine ignition angle control field, refer in particular to a kind of controlling method of gasoline direct injection engine optimal ignition angular advance.
Background technique
Ignition advance angle is vital controling parameters for petrol engine, the rationality that ignition advance angle is arranged and control accuracy directly affect the power character of motor, the index such as Economy and discharge, due to motor actual operating mode and residing environment (ambient temperature, humidity and height above sea level etc.) difference, it is also different for exporting optimum ignition advance angle to motor, therefore how according to the difference of motor actual operating mode, the change of residing geographical environment and the change of some control modules of engine body are (as external exhaust gas recirculation, Variable Valve Time control etc.) output that realizes optimum ignition advance angle controls power character to motor, the indexs such as economical and discharge all can have great improvement.
The mode to ignition advance angle control that existing market occurs is all adopt the control mode of extensive style control and ignition advance angle only along with the rotating speed of motor and load control, and does not consider the impact of change on advance angle of engine ignition of the other factorses such as environment.China Patent Publication No. CN1630785A, publication date on June 22nd, 2005, name is called in the patent of invention of " ignition advance angle defining method " and discloses a kind of ignition advance angle defining method, and the adjustable parameter affecting limit of detonability and even Optimum spark advance angle dynamically takes in: first determine a basic spark advance angle according to the engine speed of reality and load; Subsequently, when identifying pinking, in follow-up pinking regulation range, determine that first ignition advance angle postpones regulated quantity, if at least one adjustable parameter affecting limit of detonability has changed, in limit of detonability regulation range, also determine a second ignition advance angle regulated quantity, wherein, namely the type of the second ignition advance angle regulated quantity postpones or depends on adjustable parameter and change thereof in advance.But this invention only relates to repeatedly regulate ignition advance angle dynamically, does not take in the factor that can affect ignition advance angle various inside and outside car, although dynamic conditioning ignition advance angle, the ignition advance angle finally drawn is not still optimum.
Summary of the invention
The control mode that the object of the invention is to overcome advance angle of engine ignition in prior art is extensive style, do not reach the defect of optimum ignition advance angle, thering is provided a kind of by revising ignition advance angle the impact of each factor, reaching the controlling method of the gasoline direct injection engine optimal ignition angular advance of optimum ignition advance angle.
The object of the invention is to be achieved by following technical proposals:
The controlling method of gasoline direct injection engine optimal ignition angular advance, the process that optimum ignition advance angle draws is: after setting basic ignition advance angle, by measuring motor water inlet and outlet temperature, Engine Inlet Temperature and engine air-fuel ratio three factors, carry out calculating correction to basic ignition advance angle successively according to the impact of this Three factors again, detailed process is:
The first step, sets basic ignition advance angle;
Second step, according to the impact of motor water inlet and outlet temperature, basic ignition advance angle is revised: when the water inlet and outlet temperature of motor compare low when, temperature in firing chamber is also relatively low, air-fuel mixture relatively poor, rate of burning reduces, the tendency to detonate of motor is more weak, now increase ignition advance angle, when motor water inlet and outlet temperature is too high, in firing chamber, the temperature of fuel-air mixture after having compressed also can be too high, the tendency to detonate of motor is comparatively strong, now reduces ignition advance angle;
3rd step, according to Engine Inlet Temperature impact, basic ignition advance angle is revised: when motor runs under lower intake temperature, the tendency to detonate of motor weakens thereupon, now increase ignition advance angle, but when Engine Inlet Temperature is higher, the tendency to detonate of motor will strengthen, and now reduces ignition advance angle;
4th step, engine air-fuel ratio impact is revised basic ignition advance angle: when motor operates under denseer air fuel ratio, temperature in firing chamber can be reduced because denseer air fuel ratio has cooling effect to engine chamber, the tendency to detonate of motor will weaken, now increase ignition advance angle, but along with the thinning gradually cooling effect to burning of air fuel ratio will weaken, the tendency to detonate of motor will strengthen, and now reduce ignition advance angle.
Basis ignition advance angle is under motor operates in standard environment and optimum igniting moment under not considering motor practical operation situation; Increase ignition advance angle and can improve the thermal efficiency thus the power character and the Economy that promote motor, less ignition advance angle can guarantee the security of operation of motor on the contrary.When the impact of motor water inlet and outlet temperature is revised basic ignition advance angle, motor water inlet and outlet range of temperature is-30 ~ 120 DEG C, and according to the change of temperature, ignition advance angle is linear interpolation correction within the scope of-6 ~ 6 ° of CA; When Engine Inlet Temperature impact is revised basic ignition advance angle, Engine Inlet Temperature excursion is-30 ~ 80 DEG C, and ignition advance angle is in the scope internal linear correction of-4 ~ 5 ° of CA; When engine air-fuel ratio impact is revised basic ignition advance angle, the excursion of air fuel ratio is 0.7 ~ 1.5, and ignition advance angle is linear interpolation correction within the scope of-3 ~ 9 ° of CA.
As a kind of preferred version, the process that optimum ignition advance angle draws is further comprising the steps of:
5th step, altitude impact is revised basic ignition advance angle: when motor operates in high altitude localities, external pressure is lower, rarefaction of air, the actual fresh charge entered in cylinder significantly reduces, the tendency to detonate of motor will significantly weaken, and now increase ignition advance angle.Increase the power character that ignition advance angle can improve motor when plateau, reduce the loss of engine performance, within the scope of height above sea level 2000 ~ 4500m, ignition advance angle is linear interpolation correction within the scope of 0 ~ 6 ° of CA.
As a kind of preferred version, the process that optimum ignition advance angle draws is further comprising the steps of:
6th step, engines exhaust gas recirculation impact is revised basic ignition advance angle: when external exhaust gas introduced by motor, enter cylinder actual fresh charge will reduce and the specific heat capacity of waste gas can reduce more greatly the combustion temperature in cylinder, now should increase the ignition advance angle of motor.The excursion of ER EGR Rate is 0 ~ 15%, and ignition advance angle is linear interpolation correction within the scope of 0 ~ 15 ° of CA.
As a kind of preferred version, the process that optimum ignition advance angle draws is further comprising the steps of:
7th step, the impact that the Variable Valve Time of intake and exhaust controls is revised basic ignition advance angle: along with the progressively increase of the Variable Valve Time aperture of intake and exhaust, waste gas remaining in cylinder will strengthen, the higher burning room temperature that causes of the temperature of residual gas raises, the tendency to detonate of motor is strengthened, and ignition advance angle reduces; Along with the progressively reduction of the Variable Valve Time aperture of intake and exhaust, waste gas remaining in cylinder will reduce, and the lower burning room temperature that causes of the temperature of residual gas reduces, and the tendency to detonate of motor weakens, and ignition advance angle increases.The excursion of the Variable Valve Time aperture of the intake and exhaust of motor is 30 ~ 70 ° of CA, and ignition advance angle is linear interpolation correction within the scope of-3 ~ 3 ° of CA.
As a kind of preferred version, the process that optimum ignition advance angle draws is further comprising the steps of:
8th step, the impact of secondary injection correction is revised basic ignition advance angle: the change of the fuel oil ratio that the fuel oil sprayed into according to compression stroke and intake stroke spray into is revised ignition advance angle, when ratio increases, ignition advance angle reduces, and when ratio reduces, ignition advance angle increases.When the fuel ratio that intake stroke and compression stroke spray in cylinder is about 3:2, ignition advance angle is linear interpolation correction within the scope of-20 ~ 3 ° of CA.
As a kind of preferred version, the process that optimum ignition advance angle draws is further comprising the steps of:
The impact of knock control is revised basic ignition advance angle: when pinking appears in motor, and knock control is opened, and the change according to the intensity of engine knock reduces ignition advance angle, and when intensity is larger, decrease is comparatively large, and when intensity is less, decrease is less.Ignition advance angle is according to the size of knock intensity linear revise within the scope of-12 ~ 0 ° of CA.
The invention has the beneficial effects as follows, by revising ignition advance angle the impact of each factor, though motor to operate under any operating mode, environment all the time by the ignition advance angle control of motor in the best time, make the power character of motor, Economy and discharge moment all be in the optimum state.
Accompanying drawing explanation
Fig. 1 is a kind of schematic block circuit diagram of the present invention.
Wherein: 1, ignition advance angle control device, 2, cooling-water temperature sensor, 3, air-temperature sensor, 4, broad domain oxygen sensor, 5, ambient pressure sensor, 6, EGR detector, 7, Variable Valve Time, 8, secondary injection system, 9, antiknock regulator.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment: a kind of controlling method of gasoline direct injection engine optimal ignition angular advance, the process that optimum ignition advance angle draws is: after setting basic ignition advance angle, by measuring eight factors, carry out calculating correction to basic ignition advance angle successively according to the impact of this eight factor again, detailed process is:
The first step, sets basic ignition advance angle;
Second step, according to the impact of motor water inlet and outlet temperature, basic ignition advance angle is revised: when the water inlet and outlet temperature of motor compare low when, temperature in firing chamber is also relatively low, air-fuel mixture relatively poor, rate of burning reduces, the tendency to detonate of motor is more weak, now increase ignition advance angle, when motor water inlet and outlet temperature is too high, in firing chamber, the temperature of fuel-air mixture after having compressed also can be too high, the tendency to detonate of motor is comparatively strong, now reduces ignition advance angle;
3rd step, according to Engine Inlet Temperature impact, basic ignition advance angle is revised: when motor runs under lower intake temperature, the tendency to detonate of motor weakens thereupon, now increase ignition advance angle, but when Engine Inlet Temperature is higher, the tendency to detonate of motor will strengthen, and now reduces ignition advance angle;
4th step, engine air-fuel ratio impact is revised basic ignition advance angle: when motor operates under denseer air fuel ratio, temperature in firing chamber can be reduced because denseer air fuel ratio has cooling effect to engine chamber, the tendency to detonate of motor will weaken, now increase ignition advance angle, but along with the thinning gradually cooling effect to burning of air fuel ratio will weaken, the tendency to detonate of motor will strengthen, and now reduce ignition advance angle;
5th step, altitude impact is revised basic ignition advance angle: when motor operates in high altitude localities, external pressure is lower, rarefaction of air, the actual fresh charge entered in cylinder significantly reduces, the tendency to detonate of motor will significantly weaken, and now increase ignition advance angle;
6th step, engines exhaust gas recirculation impact is revised basic ignition advance angle: when external exhaust gas introduced by motor, enter cylinder actual fresh charge will reduce and the specific heat capacity of waste gas can reduce more greatly the combustion temperature in cylinder, now increase the ignition advance angle of motor;
7th step, the impact that the Variable Valve Time of intake and exhaust controls is revised basic ignition advance angle: the Variable Valve Time along with intake and exhaust opens large progressively increase, waste gas remaining in cylinder will strengthen, the higher burning room temperature that causes of the temperature of residual gas raises, the tendency to detonate of motor is strengthened, and ignition advance angle reduces; Variable Valve Time along with intake and exhaust opens large progressively reduction, and waste gas remaining in cylinder will reduce, and the lower burning room temperature that causes of the temperature of residual gas reduces, and the tendency to detonate of motor weakens, and ignition advance angle increases;
8th step, the impact of secondary injection correction is revised basic ignition advance angle: the change of the fuel oil ratio that the fuel oil sprayed into according to compression stroke and intake stroke spray into is revised ignition advance angle, when ratio increases, ignition advance angle reduces, and when ratio reduces, ignition advance angle increases;
9th step, the impact of knock control is revised basic ignition advance angle: when pinking appears in motor, and the change according to the intensity of engine knock reduces ignition advance angle, and when intensity is larger, decrease is comparatively large, and when intensity is less, decrease is less.
In sum, the formula of optimum ignition advance angle is that optimum ignition advance angle=basic firing angle+water temperature correction+intake temperature correction+air-fuel ratio correction+height above sea level correction+external exhaust gas recirculation correction+intake and exhaust Variable Valve Time controls the correction+knock control correction of correction+secondary injection, wherein:
Water temperature correction step is monitored water temperature by cooling-water temperature sensor 2 and is changed, intake temperature correction step detects intake temperature by air-temperature sensor 3 and changes, air-fuel ratio correction detects air fuel ratio by broad domain oxygen sensor 4 and changes, height above sea level correction step is detected the altitude of automobile by ambient pressure sensor 5, external exhaust gas recirculation correction step detects ER EGR Rate by EGR detector 6, intake and exhaust Variable Valve Time controls to revise step and detects Variable Valve Time aperture by Variable Valve Time 7, secondary injection correction step detects fuel oil ratio by secondary injection system 8, knock control correction step detects the intensity of pinking by detecting antiknock regulator 9, the Detection Information of all factors all transfers to ignition advance angle control device 1, ignition advance angle control device goes out optimum ignition advance angle according to formulae discovery.
When automobile motor water inlet and outlet temperature be 30 DEG C, Engine Inlet Temperature is at 30 DEG C,, air fuel ratio is 1.2, height above sea level is positioned at 3000m, ER EGR Rate 15%, Variable Valve Time aperture is 40 ° of CA, fuel oil than be 1.5, knock intensity reach the operating mode of 2/3rds of maximum strength time, angle correction is 0.7 ° of CA according to calculating, draw ignition advance angle+0.7 ° of CA based on optimum ignition advance angle thus, optimum ignition advance angle makes motor be in optimum Working.
Claims (1)
1. the controlling method of a gasoline direct injection engine optimal ignition angular advance, it is characterized in that, the process that optimum ignition advance angle draws is: after setting basic ignition advance angle, by measuring motor water inlet and outlet temperature, Engine Inlet Temperature and engine air-fuel ratio three factors, carry out calculating correction to basic ignition advance angle successively according to the impact of this Three factors again, detailed process is:
The first step, the impact of motor water inlet and outlet temperature is revised basic ignition advance angle: when the water inlet and outlet temperature of motor compare low when, temperature in firing chamber is also relatively low, air-fuel mixture relatively poor, and rate of burning reduces, the tendency to detonate of motor is more weak, now increase ignition advance angle, when motor water inlet and outlet temperature is too high, in firing chamber, the temperature of fuel-air mixture after having compressed also can be too high, the tendency to detonate of motor is comparatively strong, now reduces ignition advance angle;
Second step, Engine Inlet Temperature impact is revised basic ignition advance angle: when motor runs under lower intake temperature, the tendency to detonate of motor weakens thereupon, now increase ignition advance angle, but when Engine Inlet Temperature is higher, the tendency to detonate of motor will strengthen, and now reduces ignition advance angle;
3rd step, engine air-fuel ratio impact is revised basic ignition advance angle: when motor operates under denseer air fuel ratio, temperature in firing chamber can be reduced because denseer air fuel ratio has cooling effect to engine chamber, the tendency to detonate of motor will weaken, now increase ignition advance angle, but along with the thinning gradually cooling effect to burning of air fuel ratio will weaken, the tendency to detonate of motor will strengthen, and now reduce ignition advance angle;
4th step, altitude impact is revised basic ignition advance angle: when motor operates in high altitude localities, external pressure is lower, rarefaction of air, the actual fresh charge entered in cylinder significantly reduces, the tendency to detonate of motor will significantly weaken, and now increase ignition advance angle;
5th step, engines exhaust gas recirculation impact is revised basic ignition advance angle: when external exhaust gas introduced by motor, entering cylinder actual fresh charge will reduce, and now increase the ignition advance angle of motor;
6th step, the impact that the Variable Valve Time of intake and exhaust controls is revised basic ignition advance angle: the Variable Valve Time along with intake and exhaust opens large progressively increase, waste gas remaining in cylinder will strengthen, the higher burning room temperature that causes of the temperature of residual gas raises, the tendency to detonate of motor is strengthened, and ignition advance angle reduces; Variable Valve Time along with intake and exhaust opens large progressively reduction, and waste gas remaining in cylinder will reduce, and the lower burning room temperature that causes of the temperature of residual gas reduces, and the tendency to detonate of motor weakens, and ignition advance angle increases;
7th step, the impact of secondary injection correction is revised basic ignition advance angle: the change of the fuel oil ratio that the fuel oil sprayed into according to compression stroke and intake stroke spray into is revised ignition advance angle, when ratio increases, ignition advance angle reduces, and when ratio reduces, ignition advance angle increases;
8th step, the impact of knock control is revised basic ignition advance angle: when pinking appears in motor, and the change according to the intensity of engine knock reduces ignition advance angle, and when intensity is larger, decrease is comparatively large, and when intensity is less, decrease is less;
The formula of optimum ignition advance angle is that optimum ignition advance angle=basic firing angle+water temperature correction+intake temperature correction+air-fuel ratio correction+plateau correction+external exhaust gas recirculation correction+intake and exhaust Variable Valve Time controls the correction+knock control correction of correction+secondary injection.
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| CN106321326A (en) * | 2015-06-26 | 2017-01-11 | 上海汽车集团股份有限公司 | Method and device for obtaining ignition advance angle of vehicle |
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Address after: 315800 No. 1528 Hengshan Road, Xintao Street, Beilun District, Ningbo City, Zhejiang Province Co-patentee after: Ji'nan Geely Auto Parts Co., Ltd. Patentee after: Zhejiang Geely Power Assembly Co., Ltd. Co-patentee after: Hunan Luoyou Engine Parts Co., Ltd. Co-patentee after: Zhejiang Geely Holding Group Co., Ltd. Address before: 315800 No. 1528 Hengshan Road, Xintao Street, Beilun District, Ningbo City, Zhejiang Province Co-patentee before: Ji'nan Geely Auto Parts Co., Ltd. Patentee before: Zhejiang Geely Luoyou Engine Co., Ltd. Co-patentee before: Hunan Luoyou Engine Parts Co., Ltd. Co-patentee before: Zhejiang Geely Holding Group Co., Ltd. |
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Effective date of registration: 20200608 Address after: 315800 Zhejiang city of Ningbo province Beilun xinqie street Mt. Hengshan Road No. 1528 Co-patentee after: HUNAN LUOYOU ENGINE PARTS Co.,Ltd. Patentee after: ZHEJIANG GEELY POWER ASSEMBLY Co.,Ltd. Co-patentee after: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. Address before: 315800 Zhejiang city of Ningbo province Beilun xinqie street Mt. Hengshan Road No. 1528 Co-patentee before: JI'NAN GEELY AUTO PARTS Co.,Ltd. Patentee before: ZHEJIANG GEELY POWER ASSEMBLY Co.,Ltd. Co-patentee before: HUNAN LUOYOU ENGINE PARTS Co.,Ltd. Co-patentee before: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. |