CN102072035A - Control device for engine fuel injection - Google Patents
Control device for engine fuel injection Download PDFInfo
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- CN102072035A CN102072035A CN2010105590967A CN201010559096A CN102072035A CN 102072035 A CN102072035 A CN 102072035A CN 2010105590967 A CN2010105590967 A CN 2010105590967A CN 201010559096 A CN201010559096 A CN 201010559096A CN 102072035 A CN102072035 A CN 102072035A
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Abstract
The invention provides a control device for engine fuel injection. A correction value determining part (25) determines a correction value (KO2) for correcting the basic fuel injection time based on the oxygen concentration of discharged gases so as to allow the air-fuel ratio of the engine to be less than a theoretic air-fuel ratio. A correction part (26) calculates a fuel injection time with the correction value (KO2). The correction value (KO2) is calculated by adding or subtracting a correction term to or from a reference correction value. An operation region judging part (20) judges whether the engine rotational speed (Ne) is within an (A) region lower than a specified rotational speed, namely idling region, or within a (B) region higher than the specified rotational speed. A specified time after the correction value determining part (25) transfers an engine rotational speed region from the (B) region to the (A) region is used as a correction term under the (A) region, and a first correction term larger than a second correction term under the (B) region is used to calculate the correction value (KO2). When the engine rotational speed hastily falls into the idling region, the incline that the air-fuel ratio becomes excessive strong due to the delay of the update process of the correction value caused by the O2 feedback is avoided.
Description
Technical field
The present invention is used for the fuel injection control system of motor, and especially for the fuel injection control system of the motor that comprises feedback control, this feedback control makes the mixed gas of suction converge on chemically correct fuel based on the oxygen concentration of discharging in the gas.
Background technique
In recent years, the viewpoint of taking and discharging gas componant restriction (emission limit set) from fuel oil, implementing a kind of feedback control, it detects the oxygen concentration of discharging in the gas by the lambda sensor that is arranged at vent systems, and according to the reduction value of obtaining based on this checkout value, make the suction mixed gas converge on suitable air fuel ratio, i.e. chemically correct fuel.Usually, this feedback control is deciding with the intake negative-pressure of motor and engine speed (returning the translocation number) near sky (idle) rotating speed of fuel injection amount, and promptly low rotation speed area is carried out.For example, in patent documentation 1, disclose a kind of technology, it is implementing when slowing down, all to forbid feedback control till engine speed is reduced to specified value in the air-fuel ratio control device of air-fuel ratio feedback control based on the checkout value of oxygen concentration sensor.
Patent documentation 1:JP spy opens clear 61-81533 communique.
Yet, when engine retard, enforcement is by reducing the control that reduction value reduces fuel injection amount, but promptly slow down under steam and when protruding near the idling speed etc. under the situation, at the rapid reduction of engine speed and reduce the processing that the feedback control of reduction value does and can not catch up with, so air fuel ratio enters overrich (Over Rich) state easily.
In addition, as situation during above-mentioned urgent slow down under, because the influence of the carbon that produces during engine combustion, the gap that generates during by the Aspirating valves complete closure, sometimes have mixed gas and blown the phenomenon of getting back in the sucking pipe from the firing chamber, when this phenomenon and near aforesaid phenomenon stack of charging into the idling speed, the condition that air fuel ratio becomes the overrich state is more prone to satisfied.
In the air-fuel ratio control device that patent documentation 1 is put down in writing, because when slowing down, till being reduced to specified value, engine speed all forbids feedback control, and come into effect feedback control after below engine speed is reduced to specified value, therefore under the situation during motor promptly slows down when feedback control begins, for the rapid reduction of engine speed, the processing of feedback control can not catch up with, thereby air fuel ratio enters the overrich state easily.Further, as previously mentioned, generating under the situation of valve clearance owing to carbon, causing the possibility of overrich further to become big, so there is such problem: the zone that can suitably carry out feedback control tails off.
Summary of the invention
The objective of the invention is to, a kind of fuel injection control system is provided, it is at above-mentioned problem, the followability that expansion on one side can implement to improve at the rapid reduction of engine speed feedback control is carried out the zone of suitable feedback control, on one side as mentioned above, even the influence of carbon is arranged, also can prevent the air fuel ratio overrich that becomes.
Be used to realize that the present invention of aforementioned purpose is a kind of fuel injection control system of motor, have: reduction value decision unit, it is based on the oxygen concentration of discharging in the gas, the reduction value of decision basic injection period, the reduction value decision of this basic injection period is to the emitted dose of the fuel of motor supply, so that the air fuel ratio of motor converges on chemically correct fuel; With, fuel injection amount is calculated the unit, and it uses this reduction value and basic injection period, calculates the fuel injection time to motor; Described reduction value is by calculating benchmark reduction value plus-minus correction term, the of the present invention the 1st is characterised in that, possess the operation range identifying unit, it judges that engine speed is in the first area less than the regulation rotating speed, still is in the above second area of described regulation rotating speed; Described reduction value decision unit is constituted as: stipulated time behind the described first area is transferred to from described second area in the engine speed territory, as the correction term under the described first area, first correction term that use is bigger than second correction term under the described second area is calculated described reduction value.In addition, the of the present invention the 2nd is characterised in that, the regulation rotating speed of the employed motor of described operation range identifying unit is the value that is used to judge the no load running territory that whether is in motor.
In addition, the of the present invention the 3rd is characterised in that, no matter the rotating speed of motor is in described first area and the second area any, the stipulated time after the engine start uses fixed value to calculate described reduction value as described correction term.
In addition, the of the present invention the 4th is characterised in that, transfers to described first area in the engine speed territory from described second area and through after the stipulated time, described correction term is switched to second correction term from first correction term.
In addition, the of the present invention the 5th is characterised in that, after implementing to switch to described second correction term from described first correction term, keep second correction term as correction term till engine speed is in described second area.
In addition, the of the present invention the 6th is characterised in that, when implementing when described first correction term switches to described second correction term, and described first correction term of successively decreasing, and to described second correction term convergence.
In addition, the of the present invention the 7th is characterised in that, when implementing when described first correction term switches to described second correction term, at every turn with established amount described first correction term of successively decreasing interimly, and towards described second correction term convergence.
And then the of the present invention the 8th is characterised in that, comprises that also deviation calculates the unit, and it is used to calculate the last look of intake negative-pressure of described motor and the departure between the negative pressure value before 1 stroke; Described basic injection period is determined as the function of engine speed and intake negative-pressure, and, when the departure of being calculated the departure ratio regulation of calculating the unit by described deviation is big, in described first area, use described first reduction value bigger, and calculate described reduction value than described second reduction value.
According to the present invention with the 1st feature, in the low first area of engine speed, use than the big correction term of employed correction term in the high second area of engine speed, thereby calculate reduction value, so in feedback control, can increase basic injection period, i.e. the amount that basic emitted dose is revised (feedback quantity).Therefore, for example, when urgent geared-down engine and when charging into the first area, by strengthening the variation of feedback modifiers amount, thereby can make air fuel ratio follow the trail of chemically correct fuel (target air-fuel ratio) at short notice, and can enlarge the zone that to carry out feedback control, and, as previously mentioned, even under the situation that the influence that carbon is arranged produces, also can prevent the overrich state, and realize the improvement that fuel oil takes and discharges.Further, increase the time of correction term, so can prevent to cause the situation of engine speed fluctuation by the big feedback quantity that the big correction term of continuous use produces owing to limited.In addition, according to the present invention with the 2nd feature, when setting the first area in the no load running territory that is the overrich state in mutability, should be noted that, above-mentioned effect is remarkable especially.
According to the present invention with the 3rd feature, during the stipulated time after the engine start, can not use the processing of big correction term, thus can prevent engine speed change soon after the engine start, thus startability can be improved.
According to the present invention with the 4th feature, through after the stipulated time, use second correction term littler than first correction term, change so can prevent the engine speed that causes by big feedback quantity.
According to the present invention with the 5th feature, after in the first area, switching to second correction term from first correction term, keep this second little correction term till engine speed is in high second area, so can make the engine speed stabilization by employed correction term through after the stipulated time, and can avoid the change of engine speed to become big.
According to the present invention, can reduce the impact (シ ヨ Star Network) of the motor that the rapid switching with correction term causes, so can suppress the change of engine speed with the 6th feature.
According to the present invention,, can make correction term progressively interimly, reduce towards second correction term accurately as target when when first correction term switches to second correction term with the 7th feature.
According to the present invention with the 8th feature, on the basis of judging according to engine speed, also judge intake negative-pressure and carry out the switching of correction term, therefore, can prevent: for example, when the carbon that is accompanied by the burning generation fits in Aspirating valves etc., intake negative-pressure reduces, the basic injection period of function that is decided to be intake negative-pressure is elongated, thereby causes the overrich state.
Description of drawings
Fig. 1 is the block diagram of function of the fuel injection control system of expression one embodiment of the present invention.
Fig. 2 is the figure that expression sets in advance an example of the correction term in the reduction value determination section.
Fig. 3 is the expression correction term and concept map according to the relation between the zone of engine speed division.
Fig. 4 is the variation of output of expression O2 sensor and the figure of the corresponding relation between the selected correction term.
Sequential chart when Fig. 5 is the deceleration of summary of control of expression present embodiment.
Fig. 6 is the flow chart of O2 feedback control.
Fig. 7 is the flow chart that feedback control begins to judge.
Fig. 8 is the flow chart of the processing of expression correction term setting.
Fig. 9 is the concept map that returns correction term interimly.
Figure 10 be Fig. 5 want portion's enlarged view.
Figure 11 is the functional block diagram that is attached to the abnormal detecting device of the intake negative-pressure PB that Aspirating valves causes by carbon.
Among the figure:
1, fuel injection control system 2, control device (fuel injection amount determination section) 3, Ne sensor 4, O2 sensor 5, PB sensor 6, injection valve drive portion 7, Fuelinjection nozzle 10, stroke detection unit 11, PB detection unit 12, deviation is calculated portion 20, operation range detection unit 21, basic injection period is calculated portion 22, basic injection period correction portion 23, PB-Ne control comparing part (map) 24, air fuel ratio detection unit 25, reduction value determination section 26, correction portion
Embodiment
Below, with reference to the description of drawings one embodiment of the present invention.Fig. 1 is the block diagram that the system of the fuel injection control system of expression one embodiment of the present invention constitutes, and especially, is the pie graph of expression as the control under the idle running zone of low rotation speed area.In this figure, fuel injection control system 1 is arranged at internal combustion mechanism as the driving source of motor-driven two-wheel car etc., promptly in the motor.Fuel injection control system 1 comprises: the emitted dose that acts as a fuel determination section produce the control device 2 of function, the engine rotation speed sensor of detection of engine rotational speed N e (below, be called " Ne sensor ") 3, be arranged at the realization concentration detecting unit function of engine's exhaust system oxygen concentration sensor (below, be called " O2 sensor ") 4, the B/P EGR Back Pressure Transducer EGR of the intake negative-pressure PB of detection of engine (below, be called " PB sensor ") 5.To be input to injection valve drive portion 6,6 the indications of injection valve drive portion, driving fuel injection valve 7 by the fuel injection amount (that is the indication of the fuel injection time of expression fuel injection amount) of control device 2 decisions according to the fuel injection time of being imported.
Ne sensor 3, O2 sensor 4 and PB sensor 5 all have known formation, and the position that is installed to motor is that known position gets final product, the diagram of Therefore, omited shape and the detailed description of formation.
PB-Ne controls comparing part 23, be the storage unit of storage as the basic injection period T0 of the function of engine speed Ne and intake negative-pressure PB, and can constitute, thereby by exporting basic injection period T0 by the engine speed Ne of Ne sensor 3 inputs and the intake negative-pressure PB that imports by PB sensor 5 by the storage of microcomputer.
PB-Ne controls comparing part 23, is used for supplying with basic injection period T0 in the low rotation speed area of being judged by engine speed Ne and throttling (Throttle) aperture.In the zone more than the middling speed of being judged by engine speed Ne and throttle opening, use Ne-TH control comparing part, it supplies with basic injection period T0 based on engine speed Ne and throttle opening.Its specific description of Therefore, omited is controlled in control under the above zone of middling speed by known gimmick.
Operation range detection unit 20 will compare from the tachometer value that the engine speed Ne of Ne sensor 3 input and regional determination are used, and judgement is dummy section (below, be called " a-quadrant "), or in addition other zones of dummy section (below, be called " B zone ").Is that the a-quadrant or the data in B zone are input to reduction value determination section 25 with the operation range of being judged as expression.
Air fuel ratio detection unit 24 detects data based on the oxygen concentration from 4 inputs of O2 sensor, is that dense (rich) or rare (lean) judge about air fuel ratio A/F with respect to chemically correct fuel, and will represents that dense or rare data are input to reduction value determination section 25.
In reduction value determination section 25, corresponding A zone or B zone are set with correction term (PI correction term) respectively, and this correction term is inverted to employed soon value behind the opposing party by: air fuel ratio A/F from the wherein side of dense side and rare side; With, in addition, in a wherein side of dense side and rare side, change during employed value form.Therefore, reduction value determination section 25, to the data of representing a-quadrant whether or B zone, with air fuel ratio A/F from dense side and rare side after wherein a side is inverted to the opposing party soon or the selected correction term of timing in addition carry out plus and minus calculation, thereby determine reduction value KO2.Decision reduction value KO2 is " a benchmark reduction value (1.0) ± correction term ".Correction term is a negative value in dense side, rare side be on the occasion of.
Thereby correction portion 26 is done multiplying with reduction value KO2 and basic injection period T0 and is calculated fuel injection time Ti, and is entered into injection valve drive portion 6.
Fig. 2 is the figure that expression is set in advance in an example of the correction term in the reduction value determination section 25.In Fig. 2, about correction term, compare with timing in addition soon after the air fuel ratio A/F counter-rotating, select big value.In example shown in Figure 2, in the big B zone of engine speed Ne, employed soon correction term after the counter-rotating of air fuel ratio A/F (+PR and-PL) be " 0.01 ", the employed correction term of timing in addition (+IR and-IL) be " 0.001 ".
On the other hand, be to be lower than in the a-quadrant of 2500rmp at engine speed Ne, employed soon correction term after the counter-rotating of air fuel ratio A/F (+PR and-PL) be " 0.1 ", the employed correction term of timing in addition (+IR and-IL) be " 0.02 ".Like this, in the a-quadrant, compare, select respectively as the great value of 10 times and 20 times with the B zone.That is, when engine speed Ne is positioned at the a-quadrant, be chosen in correction term maximum in the correction term that sets in advance.
Fig. 3 is the concept map that concerns between expression correction term and the zone.As shown in Figure 3, be lower than in the a-quadrant of 2500rpm, compare greatly when the correction term of setting is regional with the B of engine speed more than it at engine speed Ne.But engine speed Ne for example, has stopped under the situation in 10 seconds in the a-quadrant, then turns back to the value of the correction term identical with the B zone.This be because, engine speed Ne temporarily rest on the a-quadrant during, by feedback control, can infer that air fuel ratio is near chemically correct fuel by employed correction term KO2 in the a-quadrant.
Fig. 4 is the figure of corresponding relation between the variation of output of expression O2 sensor 4 and the selected correction term.In Fig. 4, transverse axis is a time shaft, and the longitudinal axis is the output VO2 of O2 sensor 4 and the value of correction term.Whether it still is rare side that air fuel ratio A/F is positioned at dense side, judge more than being used to judge dense or rare threshold value (dense/rare judgement voltage) according to the output VO2 of O2 sensor 4.Then, use according to this judged result be positioned at processing during dense side or the rare side, or and then from the wherein side of dense side and rare side to the opposing party's counter-rotating after soon the treatment of selected correction term of selecting.
For example, the timing t 1 that is inverted to rare side from dense side at air fuel ratio A/F in the near future, use big positive correction term (+PR), with this correction term (+PR) timing t 2 switch to little correction term (+IR), and keep this correction term (+IR) be inverted to the timing t 3 of dense side from rare side up to air fuel ratio A/F.Therefore, the reduction value KO2 that upgrades by per stipulated time increases from " 1.0 " incipient stage property ground.
Then, the timing t 3 that is inverted to dense side at air fuel ratio A/F in the near future, use big negative correction term (PL), this correction term (PL) to be switched to little correction term (IL), and keep this correction term and (IR) be inverted to the timing t 5 of dense side from rare side up to air fuel ratio in timing t 4.
Sequential chart when Fig. 5 is the deceleration of summary of control of expression present embodiment.In Fig. 5, at timing T1, engine speed Ne and throttle opening are reduced to below the specified value, and the Ne-TH control comparing part of exporting fuel injection time is switched to the PB-Ne control comparing part that the slow-speed of revolution is used.At this, beginning converges on chemically correct fuel based on the feedback control of the output of O2 sensor 4 in order to make the air fuel ratio A/F that is judged by air fuel ratio detection unit 24, therefore controls reduction value KO2.
After switching to PB-Ne control comparing part from Ne-TH control comparing part, be reduced to the timing T2 of 2500rpm, correction term is switched to the value of using the a-quadrant (with reference to Fig. 2) from the value of B zone usefulness at engine speed Ne.And keep the correction value used this a-quadrant till the timing T3 that has passed through the stipulated time (for example, 10 seconds).That is, be reduced to less than 2500rpm with engine speed Ne and compared in the past, it is big that reduction value KO2 becomes.Therefore, can carry out the O2 feedback control, thereby under urgent situation of slowing down, also can follow with big response speed.
Then, passing through the timing T3 of stipulated time, correction term is being switched to the value (with reference to Fig. 2) in B zone in addition, a-quadrant.Enter behind the a-quadrant and through after the stipulated time, can estimate that air fuel ratio becomes to settle out, so the value the when speed that O2 is fed back turns back to non-emergent deceleration common.
Fig. 6 is the flow chart of O2 feedback control.In the step S1 of Fig. 6, judge whether to satisfy the O2 feedback control and begin condition.This Rule of judgment Fig. 8 in the back describes in detail.If satisfying the O2 feedback control begins condition, then enter step S2.In step S2,, judge that the zone based on engine speed Ne is a-quadrant or B zone according to the function of operation range detection unit 20.If the zone is the a-quadrant, then enter step S3, if the B zone then enters step S4.
In step S3, use correction term comparing part (with reference to Fig. 2) to select the pairing correction term of regional A.In step S4, when timer was carried out set (set), the time mark set that will be set to " 1 " was " 0 ", and this timer carries out instrumentation to the time of the correction term that the maintenance a-quadrant is used.In step S5, use correction term comparing part (with reference to Fig. 2) to select the pairing correction term of area B.
Fig. 7 is the flow chart that feedback control begins to judge.In step S10, according to the coolant water temperature TW of motor whether the warming-up end temp (for example, 40 ℃) of regulation with on judge whether that warming-up finishes.If step S10 is affirmative answer, then enters step S11, and judge whether the control area is the zone of using PB-Ne control comparing part.And can whether below specified value, carry out the judgement of step S11 according to throttle opening and engine speed Ne.
If step S11 then enters step S12 for certainly, judge whether O2 sensor 4 activates.About whether having activated O2 sensor 4, generally speaking, be based on the temperature of transit time after the engine start or O2 sensor 4 or water temperature etc. and judge.Transit time after the engine start is the time that needs till the O2 sensor 4 up to activating, and preestablishes based on experimental result etc.
If step S12 then enters step S13 for certainly, judge whether engine speed Ne feeds back in the value of execution area at expression O2.The engine speed Ne of expression O2 feedback execution area for example, is positioned at the scope of 1200rpm～8000rpm.
Like this, if the judgement of step S10～step S13 all is certainly, then enter the step S2 of Fig. 6.Therefore, after engine start through scheduled time, till O2 sensor 4 activates, even the state at motor is positioned under the situation of a-quadrant according to engine speed Ne, the O2 feedback control can not begin yet, can not enter the step S2 of Fig. 6, so, turn round with the fixed value (correction term 0) that does not increase correction term even engine condition is the a-quadrant yet.
Fig. 8 is the flow chart of the detailed process of expression step S3.Whether in the step S30 of Fig. 8, differentiating time mark is " 1 ".Enter behind the a-quadrant soon, time mark is initial value " 0 ", thus enter step S31, and the a-quadrant is set to the calculating part (function of reduction value determination section 25) of reduction value KO2 with pairing correction term.Like this, in reduction value determination section 25, calculate " benchmark reduction value (1.0) ± correction term " and determine reduction value.
In step S32, time (10 seconds) of the correction term that keeps the a-quadrant to use is set to timer TA.In step S33, expression timer TA is set, so be " 1 " with the timing flag set.In step S34, judge whether to have passed through the time of set in timer TA.
Up to through till the time of set in timer TA, turn back to the flow chart of Fig. 6.If through time of set in timer TA, then enter step S35, for the correction term that correction term is used from the a-quadrant turns back to the correction term of B zone usefulness interimly, then the correction term set with B zone usefulness is the desired value of correction term.In step S36, deduct predefined correction term value of deducting from current correction term.This is in order to make correction term turn back to the value of B zone usefulness gradually.
In step S37, judge that the current correction term calculated by step S36 is whether less than the desired value of correction term.If step S37 then enters step S38 for certainly, the correction term of B zone usefulness is maintained correction term.That is, described reduction value determination section 25 after enforcement switches to little correction term from big correction term, is all kept this little correction term as correction term till engine speed is in the B zone.When step S37 be negate, be correction term when also not turning back to the correction term of B zone usefulness, then enter step S39, will be set to the calculating part of reduction value KO2 by the current correction term that step S36 calculates.
Fig. 9 is the concept map that returns correction term about Fig. 8 explanation interimly.In Fig. 9, represent air fuel ratio A/F, the engine speed Ne of process in time, the relation between the reduction value KO2.Be reduced to the moment T2 that is lower than the regulation rotating speed at engine speed Ne, correction term is increased to the maximum value that can set that the a-quadrant is used.Like this, reduction value KO2 is switched to maximum value KO2max.And the stipulated time TA that is positioned between the a-quadrant with engine speed Ne keeps this maximum value KO2max, and reduces correction term from timing T3a incipient stage property ground, thereby reduction value KO2 diminishes gradually.Then, be varied down to timing T3b till the desired value from correction term after, keep correction term and be value as the B zone usefulness of desired value.Air fuel ratio A/F brings together in little amplitude from vibrating big state gradually according to the variation of this reduction value KO2.
Like this, by reducing reduction value KO2 gradually, can prevent to switch the deviation of the air fuel ratio that produces soon after the reduction value.That is, reduction value is that plus and minus calculation is carried out to correction term in the center with " 1.0 ", so up-down vibration all the time.Therefore, for example, if the peaked timing above the amplitude of reduction value KO2 is in turns back to the little correction term of B zone usefulness, then thereafter soon, big deviation can temporarily take place to dense direction in air fuel ratio.In addition, for example, if the peaked timing below the amplitude of reduction value KO2 is in turns back to the little correction term of B zone usefulness, then thereafter soon, big deviation can temporarily take place to rare direction in air fuel ratio.By implementing Fig. 8, control shown in Figure 9, can suppress the deviation of this air fuel ratio.
The effect of present embodiment is described with reference to Figure 10 that the portion that wants of Fig. 5 is amplified.In addition, be convenient to distinguish and easily see in order to make reduction value KO2 and air fuel ratio A/F, to its record up and down with staggering.In Figure 10, in being in deceleration, when timing T1 began the O2 feedback control, control to satisfy: the output according to O2 sensor 4 reduced reduction value KO2, and fuel injection time shortens, and becomes the air fuel ratio A/F that changes according to the reduction of engine speed Ne.But if the reduction of engine speed Ne is rapid, then the reduction value KO2 in the feedback control each time is little, so shown in dotted line, reduction value KO2 diminishes and wants spended time, consequently, air fuel ratio A/F shown in dotted line record among the figure, might ease down to the overrich state.
Therefore, be reduced to the moment T2 of 2500rpm, by increasing the correction term in the feedback control each time, thereby increase the level that reduction value KO2 reduces at engine speed Ne.Like this, soon, reduction value KO2 sharply diminishes before behind timing T2, consequently, suppresses hastily to be varied down to the overrich state shown in the dotted line behind the air fuel ratio A/F self-timing T2, and shown in solid line, converges on chemically correct fuel at short notice.
In addition, increase the reduction of correction term with the rapid engine speed Ne in the slow-speed of revolution territory that can follow motor thereby improve the O2 feedback speed, the effect of its generation, the carbon that produces when engine combustion is attached under the situation such as Aspirating valves, brings into play better.
When the carbon that produces in the firing chamber was attached to Aspirating valves, Aspirating valves can not be closed fully sometimes.In this case, intake negative-pressure PB is lower than just often.Consequently,, read in long basic injection period, the air fuel ratio A/F overrich that becomes easily from comparing part calculating in the control of basic injection period by PB-Ne control comparing part.
Therefore, if use the fuel injection amount control of present embodiment, then can prevent the air fuel ratio A/F overrich that becomes.
Figure 11 is the functional block diagram to the abnormal detecting device of the intake negative-pressure PB that causes adhering to of the carbon of Aspirating valves.In Figure 11, the interval till stroke detection unit 10 detects from the compression stroke of motor to exhaust stroke is between this interval, with predetermined distance output stroke testing signal.The differentiation of each stroke of engine cycles can rely on the technique known gimmick.PB sensor 5 detected intake negative-pressure PB are also obtained in the described stroke testing signals response of 11 pairs of PB detection units, and the mean value in should the interval is input to deviation and calculates portion 12.This mean value of storage in last sub-value memory section 13.Last sub-value memory section 13 whenever this mean value of intake negative-pressure PB is calculated and exported to PB detection unit 11, upgrades its this sub-value.
Deviation is calculated portion 12, and calculating is poor from PB detection unit 11 this sub-value imported and the last sub-value of reading from last sub-value memory section 13, and is input to abnormity detection portion 14.Whether abnormity detection portion 14 surpasses predefined value according to the difference of being calculated portion's 12 calculating by deviation, judges whether intake negative-pressure PB is unusual.When detecting when unusual output PB abnormal signal.
This PB abnormal signal can join feedback control about Fig. 7 explanation and begin one of them of determinating reference in the determination processing.For example, before the step S10 near Fig. 7, be provided with and differentiate the treatment step that has or not the PB abnormal signal, it constitutes: when judgement has the PB abnormal signal, then enter step S10.Like this, can detect the unusual reduction of the intake negative-pressure PB that produces under by situations such as carbon applying Aspirating valvess, and air fuel ratio A/F becomes the overrich state when preventing under these type of abnormal conditions take place urgent the deceleration.
As mentioned above, according to present embodiment, can prevent following phenomenon: when promptly slow down under steam, when engine speed protrudes near the idling speed, for the rapid minimizing of engine speed, thereby the processing that reduces reduction value KO2 does not catch up with and causes overrich.Especially, the reduction of can be the better corresponding intake negative-pressure PB that the applying of Aspirating valves is caused by carbon and then the overrich that causes.
Claims (8)
1. the fuel injection control system of a motor has:
Oxygen concentration detecting sensor (4), it is used for detecting the oxygen concentration from the discharge gas of motor discharge;
Reduction value decision unit (25), it is based on the oxygen concentration that is detected by described oxygen concentration detecting sensor (4), the emitted dose of the fuel that the reduction value that decision is revised basic injection period (KO2), the decision of this basic injection period are supplied with this motor is so that the air fuel ratio of described motor converges on chemically correct fuel; With,
Fuel injection amount is calculated unit (26), and it uses this reduction value (KO2) and described basic injection period, calculates the fuel injection time to described motor,
Described reduction value (KO2) is calculated by the benchmark reduction value is added and subtracted correction term,
The fuel injection control system of this motor is characterised in that,
Possess operation range identifying unit (20), it is used to judge that the first area that engine speed is in less than the regulation rotating speed is the a-quadrant, and still being in the above second area of described regulation rotating speed is the B zone,
Described reduction value decision unit (25), stipulated time behind the described first area is transferred to from described second area in the engine speed territory, as the correction term under the described first area, and use first correction term bigger to calculate described reduction value (KO2) than second correction term under the described second area.
2. the fuel injection control system of motor as claimed in claim 1 is characterized in that,
The regulation rotating speed of the employed motor of described operation range identifying unit (20) is the value that is used to judge the no load running territory that whether is in motor.
3. the fuel injection control system of motor as claimed in claim 1 or 2 is characterized in that,
Described reduction value decision unit (25) is constituted as, no matter the rotating speed of motor is in described first area and the second area any, with the stipulated time after the engine start as described correction term, use fixed value to calculate described reduction value (KO2).
4. as the fuel injection control system of any described motor of claim 1～3, it is characterized in that,
Described reduction value decision unit (25) is constituted as, and transfers to described first area in the engine speed territory from described second area and through after the stipulated time, described correction term is switched to second correction term from first correction term.
5. the fuel injection control system of motor as claimed in claim 4 is characterized in that,
Described reduction value decision unit (25) is constituted as, after implementing to switch to described second correction term from described first correction term, keep second correction term as correction term till engine speed is in described second area.
6. as the fuel injection control system of claim 4 or 5 described motors, it is characterized in that,
Described reduction value decision unit (25) is constituted as, when implementing when described first correction term switches to described second correction term, and described first correction term of successively decreasing, and to described second correction term convergence.
7. as the fuel injection control system of claim 4 or 5 described motors, it is characterized in that,
Described reduction value decision unit (25) is constituted as, when implementing when described first correction term switches to described second correction term, at every turn with established amount described first correction term of successively decreasing interimly, and towards described second correction term convergence.
8. as the fuel injection control system of any described motor of claim 1～7, it is characterized in that, also comprise:
B/P EGR Back Pressure Transducer EGR (5), it is used to detect the intake negative-pressure (PB) of described motor; With,
Deviation is calculated unit (12), and it is used to calculate by detected up-to-date negative pressure value of described B/P EGR Back Pressure Transducer EGR and the departure between the negative pressure value before 1 stroke,
Described basic injection period is determined the function as engine speed (Ne) and intake negative-pressure (PB), and
Described reduction value decision unit (25) is constituted as, when the departure of being calculated the departure ratio regulation of calculating unit (12) by described deviation is big, in described first area, use described first reduction value bigger to calculate described reduction value (KO2) than described second reduction value.
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| JP2009-266208 | 2009-11-24 | ||
| JP2009266208A JP5614976B2 (en) | 2009-11-24 | 2009-11-24 | Engine fuel injection control device |
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| CN102953857A (en) * | 2011-08-25 | 2013-03-06 | 通用汽车环球科技运作有限责任公司 | Indirect hcci combustion control |
| CN112855372A (en) * | 2019-11-27 | 2021-05-28 | 丰田自动车株式会社 | Engine device |
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| CN112855372B (en) * | 2019-11-27 | 2023-07-14 | 丰田自动车株式会社 | Engine device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5614976B2 (en) | 2014-10-29 |
| JP2011111904A (en) | 2011-06-09 |
| CN102072035B (en) | 2016-07-06 |
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