CN103334841B - A kind of EGR dead zone control method and system - Google Patents
A kind of EGR dead zone control method and system Download PDFInfo
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- CN103334841B CN103334841B CN201310289171.6A CN201310289171A CN103334841B CN 103334841 B CN103334841 B CN 103334841B CN 201310289171 A CN201310289171 A CN 201310289171A CN 103334841 B CN103334841 B CN 103334841B
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Abstract
The invention provides a kind of EGR valve dead zone control method, comprising: the folding condition and the EGR valve setting aperture controlling value T that detect EGR valve; If the folding condition of EGR valve is full-gear and EGR valve setting aperture controlling value is not standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of EGR valve is the first specified control value A; First specified control value A is progressively increased to setting aperture controlling value T in M time window; If the folding condition of EGR valve is full-shut position and EGR valve setting aperture controlling value is not full cut-off value, then using current time window as in initial N number of time window, the master control amount of EGR valve is the second specified control value B; Second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.By above method, EGR valve can be made by the method arranging the first specified control value and the second specified control value to depart from the control in dead band, reduce the delay to the reflection of setting aperture controlling value.
Description
Technical field
The present invention relates to engine exhaust circulating technology field, particularly a kind of EGR dead zone control method and system.
Background technique
In order to adapt to the fast development of society, automobile etc. are that the traffic tool of power are used widely by people with fuel.Such as, but go on a journey while condition at these traffic tool efficiently being supplied to people, its drawback is also gradually by people are paid attention to, and the toxic emission of motor is exactly a very important technical problem.
Motor is a kind of device chemical energy of fuel oil being become mechanical energy, and when its work, fuel oil needs to mix according to certain ratio with air.In order to satisfied country is for the relevant regulations of engine exhaust emission, motor needs to reduce the oxynitrides content in waste gas.
EGR (Engine Gas Recirculation) gas recirculation system, can waste gas be reintroduced in the gas handling system of motor by EGR valve, utilize the combustion temperature in the carbon dioxide reduction cylinder in waste gas, and then suppress the generation of oxynitrides.
Wherein, EGR valve is again the key component of EGR gas recirculation system.
EGR valve is one and is arranged on and petrol engine is used for the electromechanical integrated product of the amount of exhaust gas recirculation controlling to feed back to gas handling system.It is usually located at the right side of intake manifold, near throttle body, has a short metal tube leading to gas exhaust manifold to be connected with it.Its effect controls the exhausted air quantity entering intake manifold, makes a certain amount of waste gas flow into intake manifold and carry out recirculation.
In the prior art, the switch of method to EGR valve that egr system adopts feedforward+PID to control controls.
First the feedforward value of waste gas is calculated according to current work information, calculated the master control amount of future time window again by PID module according to the current actual aperture of EGR valve, described EGR valve, according to the opening degree of master control amount adjustment EGR valve, controls corresponding exhausted air quantity and enters into motor by EGR valve.
But there is following problem in prior art: feedforward value of the prior art is normally demarcated according to actual value during steady state, general control needs can be met, but when EGR valve is in standard-sized sheet or full off state, due to the Der Grundsatz der Maschinen of EGR valve, be not enough to that EGR valve is produced compared with the aperture changing value of fractional value and open or close action, and master control amount itself is a process gradually changed, therefore the action opened or closed can not be produced immediately in the initial stage EGR valve of master control amount change, the switch change of EGR valve is made to there is hysteresis quality, formed in " dead band " that EGR valve controls.
See Fig. 1, this figure is the aperture change curve that in prior art, EGR valve is carried out closed procedure by full-gear.
In the figure, be setting aperture at S line, P curve is actual aperture, and D district is " dead band ".
Fig. 1 is the aperture change curve of EGR valve when closing from full-gear to half-open position.Before S point, EGR valve is in full-gear always, needs EGR valve to adjust to setting aperture S when t1 point, but due to the Der Grundsatz der Maschinen of EGR valve, the change initial stage of aperture changing value is not enough to make EGR valve produce closing motion, thus defines " dead band " D.And just after formation one section of " dead band " D, carry out aperture change along actual aperture P curve.
See Fig. 2, this figure is the aperture change curve that in prior art, EGR valve is carried out closed procedure by full-gear.
Aperture change curve when EGR valve is opened from full-shut position to half-open position in fig. 2.In like manner, also create in corresponding " dead band ".
Therefore, the existence due to " dead band " makes EGR valve there is delay when changing, and has influence on the control of EGR valve to waste gas throughput, and then has influence on the firing effect of fuel in motor.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and device of EGR dead zone function, reduces the response delay that EGR valve exists when aperture changes, and solves the dead zone function problem of EGR valve.
A kind of EGR valve dead zone control method, comprising:
Detect folding condition and the described EGR valve setting aperture controlling value T of EGR valve;
If the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window;
If the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
Preferably, described first specified control value A, is specially:
A＝T+(-Q1×S1)；
Described T is setting aperture controlling value;
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function;
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
Preferably, the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, is specially:
Described EGR valve folding condition is full-gear continuously in M1 time window, and described EGR valve setting aperture controlling value is not standard-sized sheet value continuously in M2 time window.
Preferably, described second specified control value B, is specially:
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
Preferably, the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, is specially:
Described EGR valve folding condition is full-shut position continuously in N1 time window, and described EGR valve setting aperture controlling value is not full cut-off value continuously in N2 time window.
A kind of EGR valve dead band control system, is characterized in that, comprising:
Status parameter testing module, the first specified control puocessing module and the second specified control puocessing module;
Described status parameter testing module, for detecting folding condition and the described EGR valve setting aperture controlling value of EGR valve;
Described first specified control puocessing module, if the folding condition for judging described EGR valve is full-gear and described EGR valve sets aperture controlling value not as standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window;
Described second specified control puocessing module, if the folding condition for judging described EGR valve is full-shut position and described EGR valve sets aperture controlling value not as full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
Preferably, described first specified control puocessing module, also comprises: the first specified control value calculating sub module;
Described first specified control value calculating sub module, for calculating the first specified control value A;
A＝T+(-Q1×S1)；
Described T is setting aperture controlling value;
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function;
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
Preferably, described first specified control puocessing module, also comprises: the first folding condition detection sub-module and the first controlling value detection sub-module;
Described first folding condition detection sub-module is full-gear continuously for detecting described EGR valve folding condition in M1 time window;
Described first controlling value detection sub-module is not standard-sized sheet value continuously for detecting described EGR valve setting aperture controlling value in M2 time window.
Preferably, described second specified control puocessing module, also comprises: the second specified control value calculating sub module;
Described second specified control value calculating sub module, for calculating the second specified control value B;
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
Preferably, described second specified control puocessing module, also comprises: the second folding condition detection sub-module and the second controlling value detection sub-module;
Described second folding condition detection sub-module is full-shut position continuously for detecting described EGR valve folding condition in N1 time window.
Described second controlling value detection sub-module is not full cut-off value continuously for detecting EGR valve setting aperture controlling value in N2 time window.
Compared with prior art, the present invention has the following advantages:
First folding condition and the described EGR valve setting aperture controlling value T of EGR valve is detected, if the folding condition of EGR valve is full-gear and EGR valve setting aperture controlling value is not standard-sized sheet value, then being that in initial M time window, the master control amount of described EGR valve is the first specified control value A with current time window; Described first specified control value is progressively increased to setting aperture controlling value T in M time window, in like manner, if the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, then being that in initial N number of time window, the master control amount of described EGR valve is the second specified control value B with current time window; Described second specified control value is progressively reduced to setting aperture controlling value T in N number of time window.By above method, the master control amount of EGR valve can be affected by the method arranging the first specified control value and the second specified control value, make EGR valve depart from the control in dead band, reduce the delay to the reflection of setting aperture controlling value.
Accompanying drawing explanation
Fig. 1 is the aperture change curve that in prior art, EGR valve is carried out closed procedure by full-gear;
Fig. 2 is the aperture change curve that in prior art, EGR valve is carried out closed procedure by full-gear;
Fig. 3 is the flow chart of the embodiment one of EGR dead zone control method provided by the invention;
Fig. 4 is the theory diagram of the embodiment one of EGR dead band control system provided by the invention;
Fig. 5 is the theory diagram of the embodiment three of EGR dead band control system provided by the invention;
Fig. 6 is the theory diagram of the embodiment five of EGR dead band control system provided by the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
It should be noted that, in order to enable those skilled in the art understand technological scheme of the present invention better, in the examples below, EGR valve with full cut-off value for 0, with standard-sized sheet value for 100.
See Fig. 3, this figure is the flow chart of the embodiment one of EGR dead zone control method provided by the invention.
A kind of EGR valve controlling method, comprising:
S301: the folding condition and the described EGR valve setting aperture controlling value T that detect EGR valve.
S302: judge whether the folding condition of described EGR valve is full-gear and whether described EGR valve setting aperture controlling value is not standard-sized sheet value.
S303: if the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window.
S304: judge whether the folding condition of described EGR valve is full-shut position and whether described EGR valve setting aperture controlling value is not full cut-off value.
S305: if the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
Illustrate:
Detect the folding condition of EGR valve and the setting aperture controlling value T of EGR valve.The setting aperture controlling value of described EGR valve is the controlling value that the EGR valve calculated by motor MCU unit is opened.
If detect that the folding condition of EGR valve is full-gear, and EGR valve setting aperture controlling value is not EGR valve standard-sized sheet value, the then initial time window of a time window using current time window as M, in M time window, the master control amount of EGR valve is the first specified control value A.
First specified control value A is progressively increased to setting aperture controlling value T in M time window.
Detect that the folding condition of EGR valve is full-gear, setting aperture controlling value EGR valve simultaneously being detected is 80, it is not standard-sized sheet value, then with the initial time window of current time window for M (supposing that M is for 5) time window, in these 5 time windows, EGR valve master control amount is the first specified control value, and wherein, the first specified control value is progressively increased to setting aperture controlling value 80 in 5 time windows.
Show that the master control amount of EGR valve in the value of 5 time windows is thus:
If detect that the folding condition of EGR valve is full-shut position, and EGR valve setting aperture controlling value is not the value of the completely closed degree of EGR valve, then using current time window as the initial time window of N number of time window, in N number of time window, the master control amount of EGR valve is the second specified control value B.
Detect that the folding condition of EGR valve is full-shut position, setting aperture controlling value EGR valve simultaneously being detected is 10, it is not full cut-off value, it is then the initial time window of N number of (supposing that N is for 5) time window with current time window, in these 5 time windows, EGR valve setting aperture controlling value is the second specified control value, and wherein, the first specified control value is progressively reduced to setting aperture controlling value 10 in 5 time windows.
Show that the master control amount of EGR valve in the value of 5 time windows is thus:
The present embodiment has the following advantages:
First folding condition and the described EGR valve setting aperture controlling value of EGR valve is detected, if the folding condition of EGR valve is full-gear and EGR valve setting aperture controlling value is not standard-sized sheet value, then being that in initial M time window, the master control amount of described EGR valve is the first specified control value A with current time window; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window, in like manner, if the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, then being that in initial N number of time window, the master control amount of described EGR valve is the second specified control value B with current time window; Described second specified control value is progressively reduced to setting aperture controlling value T in N number of time window.By above method, the master control amount of EGR valve can be affected by the method arranging the first specified control value and the second specified control value, make EGR valve depart from the control in dead band, reduce the delay to the reflection of setting aperture controlling value.
The present embodiment is the embodiment two of EGR dead zone control method provided by the invention.
In the present embodiment, described first specified control value A, is specially:
A＝T+(-Q1×S1)。
Described T is setting aperture controlling value.
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function.
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
Illustrate:
Suppose to detect that the folding condition of EGR valve is full-gear, setting aperture controlling value EGR valve simultaneously being detected is 80, it is not standard-sized sheet value, then with the initial time window of current time window for M (supposing that M is for 5) time window, in these 5 time windows, EGR valve setting aperture controlling value is the first specified control value A.
Wherein, described first specified control value A, is specially:
A＝T+(-Q1×S1)。
Because setting aperture controlling value is 80, therefore, T=80.
Q1 is the first controlling value.Here be set to closing direction 40, its implication is that EGR valve controlled quentity controlled variable is closed into 60 from full gate 100, therefore, and Q1=40.
S1 is the first variation coefficient, and described first variation coefficient progressively reduces to 0 by 1 in 5 time windows.1≥S1≥0
Show that the first specified control value in the value of 5 time windows is thus:
The present embodiment has the following advantages:
Calculate the first specified control value by the first controlling value and the first variation coefficient, thus realize controlling to EGR valve by the first specified control value, reduce the delay of dead band to the reflection of setting aperture controlling value.
The present embodiment is the embodiment three of EGR dead zone control method provided by the invention.
In the present embodiment, the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, is specially:
EGR valve folding condition is full-gear continuously in M1 time window.
EGR valve setting aperture controlling value is not standard-sized sheet value continuously in M2 time window.
Illustrate:
Suppose M1=4, M2=3.Then:
Whether when detecting the folding condition of EGR valve, judge that EGR valve is started at from current time window, be full-gear in continuous 4 time windows.
If EGR valve is all full-gear in continuous 4 time windows comprising current time window, then detect whether described EGR valve setting aperture controlling value is not standard-sized sheet value 100 in continuous 3 time windows comprising current time window.
If EGR valve setting aperture controlling value is standard-sized sheet value in continuous 3 time windows comprising current time window, then being that in initial M time window, the master control amount of described EGR valve is the first specified control value A with current time window.
The present embodiment has the following advantages:
Detect whether EGR valve folding condition is full-gear continuously in M1 time window, if whether standard-sized sheet value then detects EGR valve setting aperture controlling value in M2 time window is not continuously standard-sized sheet value continuously.By above method, can judge whether current EGR valve is in dead band state more accurately, and then carry out EGR valve dead zone function.
The present embodiment is the embodiment four of EGR dead zone control method provided by the invention.
In the present embodiment, the second specified control value B, is specially:
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
Illustrate:
Suppose to detect that the folding condition of EGR valve is full-shut position, setting aperture controlling value EGR valve simultaneously being detected is 10, it is not full cut-off value, it is then the initial time window of N number of (supposing that N is for 5) time window with current time window, in these 5 time windows, EGR valve setting aperture controlling value is the second specified control value B.
Wherein, described second specified control value B, is specially:
B＝T+(Q2×S2)；
Setting aperture controlling value T=10.
Q2 is the second controlling value.Here be set to opening direction 40, its implication is that EGR valve controlled quentity controlled variable is opened to 40 from full cut-off value 0, therefore, and Q2=40.
S2 is the second variation coefficient, and described second variation coefficient progressively reduces to 0 by 1 in 5 time windows.1≥S1≥0
Show that the second specified control value in the value of 5 time windows is thus:
The present embodiment has the following advantages:
Calculate the second specified control value by the second controlling value and the second variation coefficient, the second specified control value can be controlled, realize the control to EGR valve, reduce the delay of dead band to the reflection of setting aperture controlling value.
The present embodiment is the embodiment five of EGR dead zone control method provided by the invention.
In the present embodiment:
The folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, is specially:
Described EGR valve folding condition is full-shut position continuously in N1 time window, and described EGR valve setting aperture controlling value is not full cut-off value continuously in N2 time window.
Illustrate:
Suppose N1=4, N2=3.Then:
Whether when detecting the folding condition of EGR valve, judge that EGR valve is started at from current time window, be full-shut position in continuous 4 time windows.
If EGR valve was all full-shut position in continuous 4 time windows before comprising current time window, then detect whether described EGR valve setting aperture controlling value was not full cut-off value 0 in continuous 3 time windows before comprising current time window.
If EGR valve setting aperture controlling value was full cut-off value in continuous 3 time windows before comprising current time window, then being that in initial N number of time window, the master control amount of described EGR valve is the second specified control value B with current time window.
The present embodiment has the following advantages:
Detect whether EGR valve folding condition is full-shut position continuously in N1 time window, if whether full cut-off value then detects EGR valve setting aperture controlling value in N2 time window is not continuously full cut-off value continuously.By above method, can judge whether current EGR valve is in dead band state more accurately, and then carry out EGR valve dead zone function.
Based on above-mentioned EGR dead zone control method, present invention also offers EGR dead band control system, describe its constituent element in detail below in conjunction with specific embodiment.
See Fig. 4, this figure is the theory diagram of EGR dead band control system embodiment one provided by the invention.
A kind of EGR valve dead band control system, is characterized in that, comprising:
Status parameter testing module 401, first specified control puocessing module 402 and the second specified control puocessing module 403;
Described status parameter testing module 401, for detecting folding condition and the described EGR valve setting aperture controlling value of EGR valve.
Described first specified control puocessing module 402, if the folding condition for judging described EGR valve is full-gear and described EGR valve sets aperture controlling value not as standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window.
Described second specified control puocessing module 403, if the folding condition for judging described EGR valve is full-shut position and described EGR valve sets aperture controlling value not as full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
Illustrate:
Status parameter testing module 401 detects the folding condition of EGR valve and the setting aperture controlling value T of EGR valve.The setting aperture controlling value of described EGR valve is the degree value that the EGR valve calculated by motor MCU unit is opened.
If the first specified control puocessing module 402 detects that the folding condition of EGR valve is full-gear, and EGR valve setting aperture controlling value is not EGR valve standard-sized sheet value, the then initial time window of a time window using current time window as M, in M time window, the master control amount of EGR valve is the first specified control value A.
First specified control value A is progressively increased to setting aperture controlling value T in M time window.
Detect that the folding condition of EGR valve is full-gear, setting aperture controlling value EGR valve simultaneously being detected is 80, it is not standard-sized sheet value, then with the initial time window of current time window for M (supposing that M is for 5) time window, in these 5 time windows, EGR valve master control amount is the first specified control value, and wherein, the first specified control value is progressively increased to setting aperture controlling value T in 5 time windows.
Show that the master control amount of EGR valve in the value of 5 time windows is thus:
If the second specified control puocessing module 403 detects that the folding condition of EGR valve is full-shut position, and EGR valve setting aperture controlling value is not EGR valve full cut-off value, then using current time window as the initial time window of N number of time window, in N number of time window, the master control amount of EGR valve is the second specified control value B.
Detect that the folding condition of EGR valve is full-shut position, setting aperture controlling value EGR valve simultaneously being detected is 10, it is not full cut-off value, it is then the initial time window of N number of (supposing that N is for 5) time window with current time window, in these 5 time windows, EGR valve master control amount is the second specified control value, and wherein, the second specified control value is progressively reduced to setting aperture controlling value T in 5 time windows.
Show that the master control amount of EGR valve in the value of 5 time windows is thus:
The present embodiment has the following advantages:
First status parameter testing module detects folding condition and the described EGR valve setting aperture controlling value of EGR valve, if the first specified control puocessing module for judge the folding condition of EGR valve and be full-gear and EGR valve setting aperture controlling value not as standard-sized sheet value, then being that in initial M time window, the master control amount of described EGR valve is the first specified control value A with current time window.In like manner, if the second specified control puocessing module judges that the folding condition of described EGR valve is full-shut position and described EGR valve sets aperture controlling value not as full cut-off value, then being that in initial N number of time window, the master control amount of described EGR valve is the second specified control value B with current time window.By above method, EGR valve can be made by the method arranging the first specified control value and the second specified control value to depart from the control in dead band, reduce the delay to the reflection of setting aperture controlling value.
The present embodiment is the second embodiment of EGR dead band control system provided by the invention.
In the present embodiment, the first specified control puocessing module, also comprises: the first specified control value calculating sub module;
Described first specified control value calculating sub module, for calculating the first specified control value A.
A＝T+(-Q1×S1)
Described T is setting aperture controlling value.
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function;
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
Illustrate:
Suppose to detect that the folding condition of EGR valve is full-gear, setting aperture controlling value EGR valve simultaneously being detected is 80, it is not standard-sized sheet value, then with the initial time window of current time window for M (supposing that M is for 5) time window, in these 5 time windows, EGR valve setting aperture controlling value is the first specified control value A.
Wherein, described first specified control value A, is specially:
A＝T+(-Q1×S1)。
Because setting aperture controlling value is 80, therefore, T=80.
Q1 is the first controlling value.Here be set to closing direction 40, its implication is that EGR valve controlling value is closed into 60 from full gate 100, therefore, and Q1=40.
S1 is the first variation coefficient, and described first variation coefficient progressively reduces to 0 by 1 in 5 time windows.1≥S1≥0
Show that the first specified control value in the value of 5 time windows is thus:
The present embodiment has the following advantages:
By using the first controlling value and the first variation coefficient to calculate the first specified control value in the first specified control value calculating sub module, thus realizing controlling to EGR valve by the first specified control value, reducing the delay of dead band to the reflection of setting aperture controlling value.
See Fig. 5, this figure is the theory diagram of the embodiment three of EGR dead band control system provided by the invention.
In the present embodiment, described first specified control puocessing module, also comprises: the first folding condition detection sub-module 501 and the first controlling value detection sub-module 502.
First folding condition detection sub-module 501 is full-gear continuously for detecting described EGR valve folding condition in M1 time window.
First controlling value detection sub-module 502 is not standard-sized sheet value continuously for detecting described EGR valve setting aperture controlling value in M2 time window.
Illustrate:
Suppose M1=4, M2=3.Then:
When detecting the folding condition of EGR valve, whether the first folding condition detection sub-module 501 judges that EGR valve is started at from current time window, be full-gear in continuous 4 time windows.
If EGR valve is all full-gear in continuous 4 time windows comprising current time window, then the first controlling value detection sub-module 502 detects whether described EGR valve setting aperture controlling value is not standard-sized sheet value 100 in continuous 3 time windows comprising current time window.
If EGR valve setting aperture controlling value is standard-sized sheet value in continuous 3 time windows comprising current time window, then being that in initial M time window, the master control amount of described EGR valve is the first specified control value A with current time window.
The present embodiment has the following advantages:
First folding condition detection sub-module detects whether EGR valve folding condition be full-gear continuously in M1 time window, if continuously standard-sized sheet value then the first controlling value detection sub-module detect EGR valve whether set aperture controlling value continuous in M2 time window be not standard-sized sheet value.By above method, can judge whether current EGR valve is in dead band state more accurately, and then carry out EGR valve dead zone function.
The present embodiment is the embodiment four of EGR dead band control system provided by the invention.
In the present embodiment, described second specified control puocessing module, also comprises: the second specified control value calculating sub module.
Described second specified control value calculating sub module, for calculating the second specified control value B.
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
Illustrate:
Suppose to detect that the folding condition of EGR valve is full-shut position, setting aperture controlling value EGR valve simultaneously being detected is 10, it is not full cut-off value, it is then the initial time window of N number of (supposing that N is for 5) time window with current time window, in these 5 time windows, EGR valve master control amount is the second specified control value B.
Wherein, described second specified control value B, is specially:
B＝T+(Q2×S2)；
Setting aperture controlling value T=10.
Q2 is the second controlling value.Here be set to opening direction 40, its implication is that EGR valve controlled quentity controlled variable is opened to 40 from full cut-off value 0, therefore, and Q2=40.
S2 is the second variation coefficient, and described second variation coefficient progressively reduces to 0 by 1 in 5 time windows.1≥S1≥0
Show that the second specified control value in the value of 5 time windows is thus:
The present embodiment has the following advantages:
Second specified control puocessing module calculates the second specified control value by the second controlling value and the second variation coefficient, and then realizes the control to EGR valve by the second specified control value, reduces the delay of dead band to the reflection of setting aperture controlling value.
See Fig. 6, this figure is the theory diagram of the embodiment five of EGR dead band control system provided by the invention.
In the present embodiment, the second specified control puocessing module, also comprises: the second folding condition detection sub-module 601 and the second controlling value detection sub-module 602;
Second folding condition detection sub-module 601 is full-shut position continuously for detecting described EGR valve folding condition in N1 time window.
Described second controlling value detection sub-module 602 is not full cut-off value continuously for detecting EGR valve setting aperture controlling value in N2 time window.
Illustrate:
Suppose N1=4, N2=3.Then:
When detecting the folding condition of EGR valve, whether the second folding condition detection sub-module 601 judges that EGR valve is started at from current time window, be full-shut position in continuous 4 time windows.
If EGR valve was all full-shut position in continuous 4 time windows before comprising current time window, then the second controlling value detection sub-module 602 detects whether described EGR valve setting aperture controlling value was not full cut-off value 0 in continuous 3 time windows before comprising current time window.
If EGR valve setting aperture controlling value was full cut-off value in continuous 3 time windows before comprising current time window, then being that in initial N number of time window, the master control amount of described EGR valve is the second specified control value B with current time window.
The present embodiment has the following advantages:
Whether the second folding condition detection sub-module 601 detects EGR valve folding condition is full-shut position continuously in N1 time window, if continuously full cut-off value whether then the second controlling value detection sub-module 602 detects EGR valve setting aperture controlling value in N2 time window be not full cut-off value continuously.By above method, can judge whether current EGR valve is in dead band state more accurately, and then carry out EGR valve dead zone function.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. an EGR valve dead zone control method, is characterized in that, comprising:
Detect folding condition and the described EGR valve setting aperture controlling value T of EGR valve;
If the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window;
If the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
2. method according to claim 1, is characterized in that, described first specified control value A, is specially:
A＝T+(-Q1×S1)；
Described T is setting aperture controlling value;
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function;
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
3. method according to claim 1, is characterized in that, the folding condition of described EGR valve is full-gear and described EGR valve setting aperture controlling value is not standard-sized sheet value, is specially:
Described EGR valve folding condition is full-gear continuously in M1 time window, and described EGR valve setting aperture controlling value is not standard-sized sheet value continuously in M2 time window.
4. method according to claim 1, is characterized in that, described second specified control value B, is specially:
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
5. method according to claim 1, is characterized in that, the folding condition of described EGR valve is full-shut position and described EGR valve setting aperture controlling value is not full cut-off value, is specially:
Described EGR valve folding condition is full-shut position continuously in N1 time window, and described EGR valve setting aperture controlling value is not full cut-off value continuously in N2 time window.
6. an EGR valve dead band control system, is characterized in that, comprising:
Status parameter testing module, the first specified control puocessing module and the second specified control puocessing module;
Described status parameter testing module, for detecting folding condition and the described EGR valve setting aperture controlling value of EGR valve;
Described first specified control puocessing module, if the folding condition for judging described EGR valve is full-gear and described EGR valve sets aperture controlling value not as standard-sized sheet value, then using current time window as in an initial M time window, the master control amount of described EGR valve is the first specified control value A; Described first specified control value A is progressively increased to setting aperture controlling value T in M time window;
Described second specified control puocessing module, if the folding condition for judging described EGR valve is full-shut position and described EGR valve sets aperture controlling value not as full cut-off value, then using current time window as in initial N number of time window, the master control amount of described EGR valve is the second specified control value B; Described second specified control value B is progressively reduced to setting aperture controlling value T in N number of time window.
7. system according to claim 6, is characterized in that, described first specified control puocessing module, also comprises: the first specified control value calculating sub module;
Described first specified control value calculating sub module, for calculating the first specified control value A;
A＝T+(-Q1×S1)；
Described T is setting aperture controlling value;
Described Q1 is the first controlling value, described EGR valve Closed control amount maximum value when described first controlling value is dead zone function;
Described S1 is the first variation coefficient, and described first variation coefficient is progressively reduced to 0 from 1 in M time window.
8. system according to claim 6, is characterized in that, described first specified control puocessing module, also comprises: the first folding condition detection sub-module and the first controlling value detection sub-module;
Described first folding condition detection sub-module is full-gear continuously for detecting described EGR valve folding condition in M1 time window;
Described first controlling value detection sub-module is not standard-sized sheet value continuously for detecting described EGR valve setting aperture controlling value in M2 time window.
9. system according to claim 6, is characterized in that, described second specified control puocessing module, also comprises: the second specified control value calculating sub module;
Described second specified control value calculating sub module, for calculating the second specified control value B;
B＝T+(Q2×S2)；
Described T is setting aperture controlling value;
Described Q2 is the second controlling value, and when described second controlling value is dead zone function, described EGR valve opens controlled quentity controlled variable maximum value;
Described S2 is the second variation coefficient, and described second variation coefficient is progressively reduced to 0 from 1 in N number of time window.
10. system according to claim 6, is characterized in that, described second specified control puocessing module, also comprises: the second folding condition detection sub-module and the second controlling value detection sub-module;
Described second folding condition detection sub-module is full-shut position continuously for detecting described EGR valve folding condition in N1 time window;
Described second controlling value detection sub-module is not full cut-off value continuously for detecting EGR valve setting aperture controlling value in N2 time window.
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| CN1380936A (en) * | 2000-05-18 | 2002-11-20 | 日产自动车株式会社 | Diesel engine control |
| EP1375876A2 (en) * | 2002-06-28 | 2004-01-02 | Kabushiki Kaisha Toyota Jidoshokki | Apparatus and method for controlling EGR in an engine |
| CN101970837A (en) * | 2008-05-12 | 2011-02-09 | 三菱重工业株式会社 | Exhaust gas recirculation controller of diesel engine |
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