CN106762327B - Combustion knock detection method and engine preignition detecting method - Google Patents
Combustion knock detection method and engine preignition detecting method Download PDFInfo
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- CN106762327B CN106762327B CN201510823624.8A CN201510823624A CN106762327B CN 106762327 B CN106762327 B CN 106762327B CN 201510823624 A CN201510823624 A CN 201510823624A CN 106762327 B CN106762327 B CN 106762327B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/152—Digital data processing dependent on pinking
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of combustion knock detection methods, compare the crank phase of the pinking identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar, IC Intake Valve Closes noise is judged whether there is to enter in the pinking identification window of current combustion cylinder, if there is IC Intake Valve Closes noise enters in the pinking identification window of current combustion cylinder, then when the pinking identification window of current combustion cylinder arrives, the overlapping knock intensity Cvirkr of current combustion cylinder is calculated using default background noise Srkr, Cvirkr=ikr/Srkr, ikr is the knock sensor signal integration amount of the pinking identification window of current combustion cylinder, since default background noise is greater than the knock sensor signal integration amount of the pinking identification window of deflagrating jar under normal circumstances, and improve knock detection threshold values, so can be with Reduce combustion knock caused by entering the pinking identification window of current combustion cylinder because of IC Intake Valve Closes noise to judge by accident.The invention also discloses a kind of engine preignition detecting methods.
Description
Technical field
The present invention relates to engine control technologies, in particular to a kind of combustion knock detection method and engine pre-ignition inspection
Survey method.
Background technique
Detonation sensor is an acceleration transducer, can detecte the vibration acoustic of object, if engine occurs not
Normal detonating combustion or pre-ignition, vibration acoustic, which is detected by detonation sensor and is converted into electric signal, is input to electronic control unit
In.When electronic control unit detects the generation of detonating combustion, electronic control unit can avoid continuous detonating combustion by adjusting lighting a fire
Occur；When electronic control unit detects pre-ignition, electronic control unit can take the measures protections such as oil-break, enriching gaseous mixture, limitation air throttle
Engine.A detonation sensor is usually filled on 4 cylinder straight engines, it monitors engine in corresponding detection window
Burning, and by corresponding ignition order, determine that detonating combustion or pre-ignition occurs in which cylinder.
Engine intake valve can generate impact to cylinder cap when closed and form vibrating noise, this noise can be with by cylinder body
It is transmitted on detonation sensor.Although the knock detection window of each cylinder and the closing motion of inlet valve be not in the same stroke
It is interior.But when a cylinder not burnt, the closing noise of inlet valve may appear precisely at another and burn
Cylinder knock detection window in, that is to say, that at the time of pinking may occur, detonation sensor receive other cylinders into
The interference of valve-closing noise, this noise bring totally unfavorable influence to the detection of pinking.In preignition detecting, also face
Face identical problem.It, can be to the detection of pinking and pre-ignition if detonation sensor receives the interference of IC Intake Valve Closes noise
Bring great difficulty.There has been no corresponding countermeasures to the above problem for current electric injection system, and in in-cylinder direct fuel-injection engine
In calibration process, the probability for this kind of situation occur is high.If because the mistake that the closing noise of inlet valve causes pinking and pre-ignition is known
, electronic control unit can not take corresponding follow-up yet, these measures be in this case it is unnecessary, can also be to engine
Performance and vehicle driving cause serious negative effect.
Knock sensor signal obtains integration amount ikr by the processing such as adding window (knock detection window), filtering, integral, then
Background noise rkr (without the level of vibration of engine under pinking operating condition) is calculated by integration amount ikr, finally calculates knock intensity
Virkr=ikr/rkr.The composition of integration amount ikr can be divided into two parts: background noise rkr and detonation signal kkr.No
When pinking, for detonation signal kkr close to 0, the algorithm and integration amount ikr that background noise rkr is learnt by one are of substantially equal；
Detonation signal kkr has biggish value, and knock intensity virkr=ikr/rkr=(rkr+kkr)/rkr also has biggish value.
It is to carry out bandpass filtering to knock sensor signal that existing electronic control unit, which inhibits the method for noise, filters pinking inspection
Survey the noise that the centre frequency band of the vibration generated in window with detonating combustion differs greatly.And studies have shown that IC Intake Valve Closes
The centre frequency band of noise and the centre frequency band that detonating combustion generates vibration are very close, can not pass through existing bandpass filtering
Function eliminates the noise jamming.If certain fuel injector IC Intake Valve Closes noise enters in pinking identification window, existing electronic control unit
There is IC Intake Valve Closes noise or detonation signal occurs in the knock sensor signal that cannot distinguish between at this time, electronic control unit
Continuous pinking can be caused to misidentify, may cause continuous by this fuel injector IC Intake Valve Closes noise also as detonation signal
The angle of ignition is postponed, thus the problems such as row's of causing temperature is high, and oil consumption is high, differential force, torque ripple is big.
Equally, if certain fuel injector IC Intake Valve Closes noise enters in pre-ignition identification window, existing electronic control unit cannot
Distinguish at this time knock sensor signal is fuel injector IC Intake Valve Closes noise or pre-ignition occurs, electronic control unit can be by oil spout
Device IC Intake Valve Closes noise error detection is pre-ignition signal, may cause engine and takes oil-break, enriching gaseous mixture, limitation air throttle
Equal measures, these can performance to engine and vehicle driving cause serious negative effect.
Summary of the invention
The technical problem to be solved by the present invention is to reduce the combustion knock as caused by IC Intake Valve Closes noise or pre-ignition to miss
Sentence.
In order to solve the above technical problems, combustion knock detection method provided by the invention, comprising the following steps:
Crankshaft phase corresponding to the IC Intake Valve Closes period of each cylinder of the engine that one, is calculated in real time under current working
Position, demarcate each cylinder of engine pinking identification window crank phase, calibration default background noise Srkr, the first pinking threshold values,
Second pinking threshold values, the first pinking threshold values are greater than the second pinking threshold values；
Two, compare the crankshaft phase of the pinking identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Position；
If the crankshaft phase of the IC Intake Valve Closes period of the next deflagrating jar of three, and the pinking identification window of current combustion cylinder
There is overlapping in position, then judgement has IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, carry out step 4；
If there is no weights for the crank phase of the pinking identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
It is folded, then judge that no IC Intake Valve Closes noise enters in the pinking identification window of current combustion cylinder, carries out step 6；
When the pinking identification window of four, current combustion cylinders arrives, to the pinking in the pinking identification window of current combustion cylinder
Sensor signal is integrated, and the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder is obtained, and is calculated
Overlapping the knock intensity Cvirkr, Cvirkr=ikr/Srkr of current combustion cylinder；
If five, which are overlapped knock intensity Cvirkr, is greater than the first pinking threshold values, detects current combustion cylinder and pinking occurs；Such as
Fruit is overlapped knock intensity Cvirkr and is less than or equal to the first pinking threshold values, then detects current combustion cylinder and pinking does not occur；Carry out step
Eight；
When the pinking identification windows of six, current combustion cylinders arrives, to the knock sensor signal in pinking identification window into
Row integral, obtains the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder, then counted by integration amount ikr
Calculation obtains background noise rkr, calculates the knock intensity virkr, virkr=ikr/rkr of current combustion cylinder；
If seven, knock intensity virkr are greater than the second pinking threshold values, detect current combustion cylinder and pinking occurs；If quick-fried
It shakes intensity virkr and is less than or equal to the second pinking threshold values, then detect current combustion cylinder and pinking does not occur；Carry out step 8；
Eight, carry out the knock detection of next deflagrating jar.
Preferably, the inlet valve of the pinking identification window and next deflagrating jar that compare current combustion cylinder closes in step 2
Close the crank phase of period；And more current light-off period is same as above between a light-off period, the inlet valve of next deflagrating jar
Close the change rate of the crank phase of period；
In step 3, if the pinking identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
There is overlapping in crank phase, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is greater than setting limit
Value, then judgement has IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, carries out step 4；If next
There are Chong Die and next for the crank phase of the pinking identification window of the IC Intake Valve Closes period and current combustion cylinder of a deflagrating jar
The change rate of the crank phase of the IC Intake Valve Closes period of a deflagrating jar is less than or equal to the setting limit value, then judges that no inlet valve closes
It closes noise to enter in the pinking identification window of current combustion cylinder, carries out step 6；If the inlet valve of next deflagrating jar closes
Period and the crank phase of the pinking identification window of current combustion cylinder are closed there is no Chong Die, then judge no IC Intake Valve Closes noise into
Enter into the pinking identification window of current combustion cylinder, carries out step 6.
Preferably, also calibration first angle, second angle, first angle are less than second angle in step 1；
In step 5, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than first jiao
Degree；If pinking does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed；
In step 7, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than second jiao
Degree；If pinking does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed.
Preferably, first time, the second time are also demarcated, at the first time less than the second time in step 1；
In step 4, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder at first
It is interior to be filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, completes background noise
It practises；
In step 6, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder at second
It is interior to be filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, completes background noise
It practises.
In order to solve the above technical problems, engine preignition detecting method provided by the invention, comprising the following steps:
(1) crankshaft phase corresponding to the IC Intake Valve Closes period for each cylinder of engine that is calculated in real time under current working
Position, demarcate each cylinder of engine pre-ignition identification window crank phase, calibration default background noise Srkr, the first pre-ignition threshold values,
Second pre-ignition threshold values, the first pre-ignition threshold values are greater than the second pre-ignition threshold values；
(2) compares the crankshaft of the pre-ignition identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Phase；
(3) if the crankshaft of the pre-ignition identification window of the IC Intake Valve Closes period of the next deflagrating jar of and current combustion cylinder
There is overlapping in phase, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carry out step
(4)；If the IC Intake Valve Closes period of next deflagrating jar and the crank phase of the pre-ignition identification window of current combustion cylinder are not deposited
It is being overlapped, is then judging that no IC Intake Valve Closes noise enters in the pre-ignition identification window of current combustion cylinder, carrying out step (6)；
(4) when the pre-ignition identification window of current combustion cylinder arrives, to quick-fried in the pre-ignition identification window of current combustion cylinder
Shake sensor signal is integrated, and the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder is obtained, and is counted
Calculate overlapping pre-ignition the intensity Cvjrkr, Cvjrkr=jkr/Srkr of current combustion cylinder；
(5) it if overlapping pre-ignition intensity Cvjrkr is greater than the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；
If being overlapped pre-ignition intensity Cvjrkr is less than or equal to the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition does not occur；It is walked
Suddenly (eight)；
(6) when the pre-ignition identification window of current combustion cylinder arrives, to the knock sensor signal in pre-ignition identification window
It is integrated, obtains the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder, then by integration amount jkr
Background noise rkr is calculated, calculates pre-ignition the intensity vjrkr, vjrkr=jkr/rkr of current combustion cylinder；
(7) it if pre-ignition intensity vjrkr is greater than the second pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；If
Pre-ignition intensity vjrkr is less than or equal to the second pre-ignition threshold values, then detects current combustion cylinder and pre-ignition does not occur；Carry out step 8；
(8) carries out the preignition detecting of next deflagrating jar.
Preferably, comparing the pre-ignition identification window of current combustion cylinder and the inlet valve of next deflagrating jar in step (2)
Close the crank phase of period；And more current light-off period is same as above between a light-off period, the air inlet of next deflagrating jar
Door closes the change rate of the crank phase of period；
In step (3), if the pre-ignition identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
Crank phase exist overlapping, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar be greater than setting
Limit value, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carries out step (4)；If
The crank phase of the pre-ignition identification window of the IC Intake Valve Closes period and current combustion cylinder of next deflagrating jar there are Chong Die, and
The change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is less than or equal to the setting limit value, then judges no air inlet
Door is closed noise and is entered in the pre-ignition identification window of current combustion cylinder, and step (6) is carried out；If next deflagrating jar into
Valve-closing period and the crank phase of the pre-ignition identification window of current combustion cylinder then judge no IC Intake Valve Closes there is no Chong Die
Noise enters in the pre-ignition identification window of current combustion cylinder, carries out step (6).
Preferably, also calibration first angle, second angle, first angle are less than second angle in step (1)；
In step (5), if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than first
Angle；If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed；
In step (7), if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than second
Angle；If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed.
Preferably, first time, the second time are also demarcated, at the first time less than the second time in step (1)；
In step (4), to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder
It is filtered in one time, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, completed background and make an uproar
Sound study；
In step (6), to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder
It is filtered in two times, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, completed background and make an uproar
Sound study.
Combustion knock detection method of the invention has been grasped the rule of noise appearance by calibrating parameters, positioned in real time
At the time of the position of pinking identification window and IC Intake Valve Closes, it can accurately identify whether to have IC Intake Valve Closes noise to enter quick-fried
It shakes in identification window.If detecting, this noise enters in pinking identification window, by initial background noise, improves pinking simultaneously
Detection threshold inhibits the generation of erroneous judgement；If entering in pinking identification window without IC Intake Valve Closes noise, keep normal
Knock detection strategy keeps the knock detection function of electronic control unit more perfect.
Engine preignition detecting method of the invention, principle and above-mentioned combustion knock detection method are essentially identical, also can
Reduce the erroneous judgement of the engine pre-ignition as caused by IC Intake Valve Closes noise.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, the required attached drawing of the present invention is made below simple
It introduces, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill people
For member, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is one embodiment flow chart of combustion knock detection method of the invention；
Fig. 2 is one embodiment flow chart of engine preignition detecting method of the invention.
Specific embodiment
Below in conjunction with attached drawing, clear, complete description is carried out to the technical solution in the present invention, it is clear that described
Embodiment is a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Embodiment one
Combustion knock detection method, as shown in Figure 1, comprising the following steps:
Crankshaft phase corresponding to the IC Intake Valve Closes period of each cylinder of the engine that one, is calculated in real time under current working
Position, demarcate each cylinder of engine pinking identification window crank phase, calibration default background noise Srkr, the first pinking threshold values,
Second pinking threshold values, the first pinking threshold values are greater than the second pinking threshold values；
Two, compare the crankshaft phase of the pinking identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Position；
If the crankshaft phase of the IC Intake Valve Closes period of the next deflagrating jar of three, and the pinking identification window of current combustion cylinder
There is overlapping in position, then judgement has IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, carry out step 4；
If there is no weights for the crank phase of the pinking identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
It is folded, then judge that no IC Intake Valve Closes noise enters in the pinking identification window of current combustion cylinder, carries out step 6；
When the pinking identification window of four, current combustion cylinders arrives, to the pinking in the pinking identification window of current combustion cylinder
Sensor signal is integrated, and the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder is obtained, and is calculated
Overlapping the knock intensity Cvirkr, Cvirkr=ikr/Srkr of current combustion cylinder；
If five, which are overlapped knock intensity Cvirkr, is greater than the first pinking threshold values, detects current combustion cylinder and pinking occurs；Such as
Fruit is overlapped knock intensity Cvirkr and is less than or equal to the first pinking threshold values, then detects current combustion cylinder and pinking does not occur；Carry out step
Eight；
When the pinking identification windows of six, current combustion cylinders arrives, to the knock sensor signal in pinking identification window into
Row integral, obtains the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder, then counted by integration amount ikr
Calculation obtains background noise rkr (without the level of vibration of engine under pinking pre-ignition operating condition), and the pinking for calculating current combustion cylinder is strong
Spend virkr, virkr=ikr/rkr；
If seven, knock intensity virkr are greater than the second pinking threshold values, detect current combustion cylinder and pinking occurs；If quick-fried
It shakes intensity virkr and is less than or equal to the second pinking threshold values, then detect current combustion cylinder and pinking does not occur；Carry out step 8；
Eight, carry out the knock detection of next deflagrating jar.
The combustion knock detection method of embodiment one, the air inlet of each cylinder of the engine being calculated under current working in real time
Door closes crank phase corresponding to the period, demarcates the crank phase of the pinking identification window of each cylinder of engine, relatively more current combustion
The crank phase for burning the pinking identification window of cylinder and the IC Intake Valve Closes period of next deflagrating jar judges whether there is inlet valve pass
It closes noise to enter in the pinking identification window of current combustion cylinder, if there is IC Intake Valve Closes noise enters current combustion cylinder
In pinking identification window, then when the pinking identification window of current combustion cylinder arrives, worked as using default background noise Srkr calculating
Overlapping the knock intensity Cvirkr, Cvirkr=ikr/Srkr, ikr of preceding deflagrating jar are the pinking identification window of current combustion cylinder
Knock sensor signal integration amount, due to default background noise Srkr it is larger (be greater than under normal circumstances (there is no pinking, pre-ignition,
Valve-closing noise etc.) interior deflagrating jar pinking identification window knock sensor signal integration amount ikr), so as to reduce
Combustion knock erroneous judgement.Meanwhile when there is IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, improve
Knock detection threshold values can further decrease combustion knock erroneous judgement.
The combustion knock detection method of embodiment one has grasped the rule of noise appearance by calibrating parameters, fixed in real time
Whether at the time of the position of position pinking identification window and IC Intake Valve Closes, can accurately identify has IC Intake Valve Closes noise to enter
In pinking identification window.If detecting, this noise enters in pinking identification window, passes through initial background noise while improving quick-fried
Detection threshold is shaken, the generation of erroneous judgement is inhibited；If entering in pinking identification window without IC Intake Valve Closes noise, keep normal
Knock detection strategy, keep the knock detection function of electronic control unit more perfect.
Embodiment two
Combustion knock detection method based on embodiment one in step 2, compares the pinking recognition window of current combustion cylinder
The crank phase of mouth and the IC Intake Valve Closes period of next deflagrating jar；And more current light-off period is same as above a light-off period
Between, the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar；
In step 3, if the pinking identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
There is overlapping in crank phase, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is greater than setting limit
Value, then judgement has IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, carries out step 4；If next
There are Chong Die and next for the crank phase of the pinking identification window of the IC Intake Valve Closes period and current combustion cylinder of a deflagrating jar
The change rate of the crank phase of the IC Intake Valve Closes period of a deflagrating jar is less than or equal to the setting limit value, then judges that no inlet valve closes
It closes noise to enter in the pinking identification window of current combustion cylinder, carries out step 6；If the inlet valve of next deflagrating jar closes
Period and the crank phase of the pinking identification window of current combustion cylinder are closed there is no Chong Die, then judge no IC Intake Valve Closes noise into
Enter into the pinking identification window of current combustion cylinder, carries out step 6.
The combustion knock detection method of embodiment three optimizes pinking identification, in the air inlet of next deflagrating jar
Door close period and the crank phase of the pinking identification window of current combustion cylinder there are it is Chong Die when, also further judge next combustion
Whether the change rate for burning the crank phase of the IC Intake Valve Closes period of cylinder is sufficiently fast, if change rate Gao Ze is with higher pinking threshold values
Pinking identification is carried out, pinking identification is carried out with lower pinking threshold values if change rate is low.
Embodiment three
Combustion knock detection method based on embodiment one, in step 1, also calibration first angle, second angle, the
One angle is less than second angle；
In step 5, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than first jiao
Degree；If pinking does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed；
In step 7, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than second jiao
Degree；If pinking does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed.
Embodiment 3 years combustion knock detection methods are postponed current if pinking occurs for detection current combustion cylinder
The angle of ignition of deflagrating jar, and when the pinking identification window for thering is IC Intake Valve Closes noise to enter current combustion cylinder, limitation is current
The maximum retardation of the angle of ignition of deflagrating jar, to reduce because the pinking for having IC Intake Valve Closes noise to enter current combustion cylinder is known
The erroneous judgement of combustion knock caused by other window causes excessive influence to engine operation.
Example IV
Combustion knock detection method based on embodiment one, in step 1, also calibration at the first time, the second time, the
One time is less than the second time；
In step 4, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder at first
It is interior to be filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, completes background noise
It practises；
In step 6, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder at second
It is interior to be filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, completes background noise
It practises.
The combustion knock detection method of example IV, when the pinking for thering is IC Intake Valve Closes noise to enter current combustion cylinder
Identification window, then when shortening the low-pass filtering of knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder
Between, background noise rkr study at this time, in same level, is completed into background noise to integration amount ikr in the shorter time
It practises.
Embodiment five
Engine preignition detecting method, figure is as indicated with 2, comprising the following steps:
(1) crankshaft phase corresponding to the IC Intake Valve Closes period for each cylinder of engine that is calculated in real time under current working
Position, demarcate each cylinder of engine pre-ignition identification window crank phase, calibration default background noise Srkr, the first pre-ignition threshold values,
Second pre-ignition threshold values, the first pre-ignition threshold values are greater than the second pre-ignition threshold values；
(2) compares the crankshaft of the pre-ignition identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Phase；
(3) if the crankshaft of the pre-ignition identification window of the IC Intake Valve Closes period of the next deflagrating jar of and current combustion cylinder
There is overlapping in phase, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carry out step
(4)；If the IC Intake Valve Closes period of next deflagrating jar and the crank phase of the pre-ignition identification window of current combustion cylinder are not deposited
It is being overlapped, is then judging that no IC Intake Valve Closes noise enters in the pre-ignition identification window of current combustion cylinder, carrying out step (6)；
(4) when the pre-ignition identification window of current combustion cylinder arrives, to quick-fried in the pre-ignition identification window of current combustion cylinder
Shake sensor signal is integrated, and the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder is obtained, and is counted
Calculate overlapping pre-ignition the intensity Cvjrkr, Cvjrkr=jkr/Srkr of current combustion cylinder；
(5) it if overlapping pre-ignition intensity Cvjrkr is greater than the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；
If being overlapped pre-ignition intensity Cvjrkr is less than or equal to the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition does not occur；It is walked
Suddenly (eight)；
(6) when the pre-ignition identification window of current combustion cylinder arrives, to the knock sensor signal in pre-ignition identification window
It is integrated, obtains the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder, then by integration amount jkr
It is calculated background noise rkr (without the level of vibration of engine under pinking pre-ignition operating condition), calculates the pre-ignition of current combustion cylinder
Intensity vjrkr, vjrkr=jkr/rkr；
(7) it if pre-ignition intensity vjrkr is greater than the second pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；If
Pre-ignition intensity vjrkr is less than or equal to the second pre-ignition threshold values, then detects current combustion cylinder and pre-ignition does not occur；Carry out step 8；
(8) carries out the preignition detecting of next deflagrating jar.
The engine preignition detecting method of embodiment five, the air inlet of each cylinder of the engine being calculated under current working in real time
Door closes crank phase corresponding to the period, demarcates the crank phase of the pre-ignition identification window of each cylinder of engine, relatively more current combustion
The crank phase for burning the pre-ignition identification window of cylinder and the IC Intake Valve Closes period of next deflagrating jar judges whether there is inlet valve pass
It closes noise to enter in the pre-ignition identification window of current combustion cylinder, if there is IC Intake Valve Closes noise enters current combustion cylinder
In pre-ignition identification window, then when the pre-ignition identification window of current combustion cylinder arrives, worked as using default background noise Srkr calculating
Overlapping pre-ignition the intensity Cvjrkr, Cvjrkr=jkr/Srkr, jkr of preceding deflagrating jar are the pre-ignition identification window of current combustion cylinder
Knock sensor signal integration amount, due to default background noise Srkr it is larger (be greater than under normal circumstances (there is no pinking, pre-ignition,
IC Intake Valve Closes noise etc.) deflagrating jar pre-ignition identification window knock sensor signal integration amount jkr), so as to reduce
Engine pre-ignition erroneous judgement.Meanwhile when there is IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, improve
Preignition detecting threshold values can further decrease engine pre-ignition erroneous judgement.
The engine preignition detecting method of embodiment five has grasped the rule of noise appearance by calibrating parameters, fixed in real time
Whether at the time of the position of position pre-ignition identification window and IC Intake Valve Closes, can accurately identify has IC Intake Valve Closes noise to enter
In pre-ignition identification window.If detecting, this noise enters in pre-ignition identification window, by initial background noise while improving morning
Detection threshold is fired, the generation of erroneous judgement is inhibited；If entering in pre-ignition identification window without IC Intake Valve Closes noise, keep normal
Preignition detecting strategy, keep the preignition detecting function of electronic control unit more perfect.
Embodiment six
Engine preignition detecting method based on embodiment five in step (2), compares the pre-ignition identification of current combustion cylinder
The crank phase of the IC Intake Valve Closes period of window and next deflagrating jar；And more current light-off period is same as above igniting week
Between phase, the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar；
In step (3), if the pre-ignition identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
Crank phase exist overlapping, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar be greater than setting
Limit value, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carries out step (4)；If
The crank phase of the pre-ignition identification window of the IC Intake Valve Closes period and current combustion cylinder of next deflagrating jar there are Chong Die, and
The change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is less than or equal to the setting limit value, then judges no air inlet
Door is closed noise and is entered in the pre-ignition identification window of current combustion cylinder, and step (6) is carried out；If next deflagrating jar into
Valve-closing period and the crank phase of the pre-ignition identification window of current combustion cylinder then judge no IC Intake Valve Closes there is no Chong Die
Noise enters in the pre-ignition identification window of current combustion cylinder, carries out step (6).
The engine preignition detecting method of embodiment six optimizes pinking identification, in the air inlet of next deflagrating jar
Door close period and the crank phase of the pre-ignition identification window of current combustion cylinder there are it is Chong Die when, also further judge next combustion
Whether the change rate for burning the crank phase of the IC Intake Valve Closes period of cylinder is sufficiently fast, if change rate Gao Ze is with higher pre-ignition threshold values
Pre-ignition identification is carried out, pre-ignition identification is carried out with lower pre-ignition threshold values if change rate is low.
Embodiment seven
Engine preignition detecting method based on embodiment five, in step (1), also calibration first angle, second angle,
First angle is less than second angle；
In step (5), if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than first
Angle；If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed；
In step (7), if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder is postponed less than second
Angle；If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed.
The engine preignition detecting method of embodiment seven postpones current combustion if pre-ignition occurs for detection current combustion cylinder
The angle of ignition of cylinder is burnt, and when the pre-ignition identification window for having IC Intake Valve Closes noise to enter current combustion cylinder, limits current combustion
The maximum retardation of the angle of ignition of cylinder is burnt, to reduce the pre-ignition identification because there is IC Intake Valve Closes noise to enter current combustion cylinder
The erroneous judgement of engine pre-ignition caused by window causes excessive influence to engine operation.
Embodiment eight
Engine preignition detecting method based on embodiment five, in step (1), also calibration at the first time, the second time,
At the first time less than the second time；
In step (4), to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder
It is filtered in one time, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, completed background and make an uproar
Sound study；
In step (6), to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder
It is filtered in two times, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, completed background and make an uproar
Sound study.
The engine preignition detecting method of embodiment eight, when the pre-ignition for thering is IC Intake Valve Closes noise to enter current combustion cylinder
Identification window then shortens the low-pass filtering of the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder
Background noise rkr study at this time, in same level, is completed background noise to integration amount jkr in the shorter time by the time
Study.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (7)
1. a kind of combustion knock detection method, which comprises the following steps:
Crankshaft phase corresponding to the IC Intake Valve Closes period of each cylinder of the engine that step 1 is calculated in real time under current working
Position, demarcate each cylinder of engine pinking identification window crank phase, calibration default background noise Srkr, the first pinking threshold values,
Second pinking threshold values, the first pinking threshold values are greater than the second pinking threshold values；
Step 2 compares the crankshaft phase of the pinking identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Position；And more current light-off period is same as above between a light-off period, the crankshaft of the IC Intake Valve Closes period of next deflagrating jar
The change rate of phase；
If the crankshaft phase of the IC Intake Valve Closes period of the next deflagrating jar of step 3 and the pinking identification window of current combustion cylinder
There is overlapping in position, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is greater than setting limit value, then
Judgement has IC Intake Valve Closes noise to enter in the pinking identification window of current combustion cylinder, carries out step 4；If next combustion
IC Intake Valve Closes period and the crank phase of the pinking identification window of current combustion cylinder of cylinder are burnt there are Chong Die, and next combustion
The change rate for burning the crank phase of the IC Intake Valve Closes period of cylinder is less than or equal to the setting limit value, then judges that no IC Intake Valve Closes are made an uproar
Sound enters in the pinking identification window of current combustion cylinder, carries out step 6；If when the IC Intake Valve Closes of next deflagrating jar
Section with the crank phase of the pinking identification window of current combustion cylinder be not present it is Chong Die, then judge that no IC Intake Valve Closes noise enters
In the pinking identification window of current combustion cylinder, step 6 is carried out；When the pinking identification window of step 4 current combustion cylinder arrives,
Knock sensor signal in the pinking identification window of current combustion cylinder is integrated, the pinking identification of current combustion cylinder is obtained
The knock sensor signal integration amount ikr of window calculates overlapping the knock intensity Cvirkr, Cvirkr=ikr/ of current combustion cylinder
Srkr；
If step 5, which is overlapped knock intensity Cvirkr, is greater than the first pinking threshold values, detects current combustion cylinder and pinking occurs；Such as
Fruit is overlapped knock intensity Cvirkr and is less than or equal to the first pinking threshold values, then detects current combustion cylinder and pinking does not occur；Carry out step
Eight；
When the pinking identification window of step 6 current combustion cylinder arrives, to the knock sensor signal in pinking identification window into
Row integral, obtains the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder, then counted by integration amount ikr
Calculation obtains background noise rkr, calculates the knock intensity virkr, virkr=ikr/rkr of current combustion cylinder；
If step 7 knock intensity virkr is greater than the second pinking threshold values, detects current combustion cylinder and pinking occurs；If quick-fried
It shakes intensity virkr and is less than or equal to the second pinking threshold values, then detect current combustion cylinder and pinking does not occur；Carry out step 8；
Step 8 carries out the knock detection of next deflagrating jar.
2. combustion knock detection method according to claim 1, which is characterized in that
In step 1, also calibration first angle, second angle, first angle are less than second angle；
In step 5, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder, which is postponed, is less than first angle；Such as
Pinking does not occur for fruit detection current combustion cylinder, and the angle of ignition of current combustion cylinder is not postponed；
In step 7, if pinking occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder, which is postponed, is less than second angle；Such as
Pinking does not occur for fruit detection current combustion cylinder, and the angle of ignition of current combustion cylinder is not postponed.
3. combustion knock detection method according to claim 1, which is characterized in that
In step 1, first time, the second time are also demarcated, at the first time less than the second time；
In step 4, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder within first time
It is filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, complete background noise study；
In step 6, to the knock sensor signal integration amount ikr of the pinking identification window of current combustion cylinder within the second time
It is filtered, this circulation background noise of the pinking identification window of current combustion cylinder is calculated, complete background noise study.
4. a kind of engine preignition detecting method, which comprises the following steps:
Crankshaft phase corresponding to the IC Intake Valve Closes period of each cylinder of the engine that step 1 is calculated in real time under current working
Position, demarcate each cylinder of engine pre-ignition identification window crank phase, calibration default background noise Srkr, the first pre-ignition threshold values,
Second pre-ignition threshold values, the first pre-ignition threshold values are greater than the second pre-ignition threshold values；
Step 2 compares the crankshaft of the pre-ignition identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Phase；
If the crankshaft of the pre-ignition identification window of the IC Intake Valve Closes period of the next deflagrating jar of step 3 and current combustion cylinder
There is overlapping in phase, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carry out step
Four；If the IC Intake Valve Closes period of next deflagrating jar and the crank phase of the pre-ignition identification window of current combustion cylinder are not deposited
It is being overlapped, is then judging that no IC Intake Valve Closes noise enters in the pre-ignition identification window of current combustion cylinder, carrying out step 6；
When the pre-ignition identification window of step 4 current combustion cylinder arrives, to the pinking in the pre-ignition identification window of current combustion cylinder
Sensor signal is integrated, and the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder is obtained, and is calculated
Overlapping pre-ignition the intensity Cvjrkr, Cvjrkr=jkr/Srkr of current combustion cylinder；
If step 5, which is overlapped pre-ignition intensity Cvjrkr, is greater than the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；
If being overlapped pre-ignition intensity Cvjrkr is less than or equal to the first pre-ignition threshold values, detects current combustion cylinder and pre-ignition does not occur；It is walked
Rapid eight；
When the pre-ignition identification window of step 6 current combustion cylinder arrives, to the knock sensor signal in pre-ignition identification window into
Row integral, obtains the knock sensor signal integration amount jkr of the pre-ignition identification window of current combustion cylinder, then counted by integration amount jkr
Calculation obtains background noise rkr, calculates pre-ignition the intensity vjrkr, vjrkr=jkr/rkr of current combustion cylinder；
If step 7 pre-ignition intensity vjrkr is greater than the second pre-ignition threshold values, detects current combustion cylinder and pre-ignition occurs；If early
It fires intensity vjrkr and is less than or equal to the second pre-ignition threshold values, then detect current combustion cylinder and pre-ignition does not occur；Carry out step 8；
Step 8 carries out the preignition detecting of next deflagrating jar.
5. engine preignition detecting method according to claim 4, which is characterized in that
In step 2, compare the song of the pre-ignition identification window of current combustion cylinder and the IC Intake Valve Closes period of next deflagrating jar
Axis phase；And more current light-off period is same as above between a light-off period, the IC Intake Valve Closes period of next deflagrating jar
The change rate of crank phase；
In step 3, if the song of the pre-ignition identification window of the IC Intake Valve Closes period of next deflagrating jar and current combustion cylinder
There is overlapping in axis phase, and the change rate of the crank phase of the IC Intake Valve Closes period of next deflagrating jar is greater than setting limit
Value, then judgement has IC Intake Valve Closes noise to enter in the pre-ignition identification window of current combustion cylinder, carries out step 4；Under if
The crank phase of the pre-ignition identification window of the IC Intake Valve Closes period and current combustion cylinder of one deflagrating jar there are Chong Die, and under
The change rate of the crank phase of the IC Intake Valve Closes period of one deflagrating jar is less than or equal to the setting limit value, then judges no inlet valve
It closes noise to enter in the pre-ignition identification window of current combustion cylinder, carries out step 6；If the inlet valve of next deflagrating jar
It closes period and the crank phase of the pre-ignition identification window of current combustion cylinder and is not present Chong Die, then judge no IC Intake Valve Closes noise
It enters in the pre-ignition identification window of current combustion cylinder, carries out step 6.
6. engine preignition detecting method according to claim 4, which is characterized in that
In step 1, also calibration first angle, second angle, first angle are less than second angle；
In step 5, if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder, which is postponed, is less than first angle；
If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed；
In step 7, if pre-ignition occurs for detection current combustion cylinder, the angle of ignition of current combustion cylinder, which is postponed, is less than second angle；
If pre-ignition does not occur for detection current combustion cylinder, the angle of ignition of current combustion cylinder is not postponed.
7. engine preignition detecting method according to claim 4, which is characterized in that
In step 1, first time, the second time are also demarcated, at the first time less than the second time；
In step 4, to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder at the first time
It is inside filtered, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, complete background noise study；
In step 6, to the knock sensor signal integration amount jkr in the pre-ignition identification window of current combustion cylinder in the second time
It is inside filtered, this circulation background noise of the pre-ignition identification window of current combustion cylinder is calculated, complete background noise study.
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| CN111441893B (en) * | 2020-03-24 | 2022-07-22 | 联合汽车电子有限公司 | Split-cylinder ignition control method and system applied to engine and readable storage medium |
| CN111852719B (en) * | 2020-05-28 | 2022-07-19 | 联合汽车电子有限公司 | Ignition angle control method, system and readable storage medium |
| CN111964911B (en) * | 2020-08-31 | 2021-09-14 | 东风汽车集团有限公司 | Engine knock judgment method based on background voltage value correction |
| CN112682241B (en) * | 2020-12-29 | 2022-10-04 | 联合汽车电子有限公司 | Method and device for controlling ignition timing of engine |
| CN112682240B (en) * | 2020-12-29 | 2022-12-13 | 联合汽车电子有限公司 | Ignition angle control method and control device thereof |
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| US5743233A (en) * | 1993-10-05 | 1998-04-28 | Robert Bosch Gmbh | Method for detecting knocking |
| CN101600950A (en) * | 2007-02-05 | 2009-12-09 | 法国欧陆汽车公司 | Apparatus and method for processing engine knocking in I. C. engine signal of the interference noise influence that has reduced |
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