CN104948322B - The control device of internal combustion engine - Google Patents
The control device of internal combustion engine Download PDFInfo
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- CN104948322B CN104948322B CN201410124124.0A CN201410124124A CN104948322B CN 104948322 B CN104948322 B CN 104948322B CN 201410124124 A CN201410124124 A CN 201410124124A CN 104948322 B CN104948322 B CN 104948322B
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Abstract
The present invention is the control device of internal combustion engine.In the existing structure, exhaust gas recirculatioon or by variable valve mechanism control air inlet-exhaust valve phase or lift in the case where, the operational precision for the air capacity being inhaled into cylinder deteriorates, generate the exhaust as caused by the variation of air-fuel ratio deterioration or as cogging and catch fire, the mistake of time of ignition into pinking caused by angle generation or as cross delay angle caused by combustion instability.Have gas flow transducer in the upstream of throttle valve and has pressure sensor in the downstream of throttle valve, have: flow is passed through come operation throttle valve based on pressure sensor, based on the throttle valve after operation by flow come the pressure in operation throttle valve downstream, based on the throttle downstream pressure after operation, the unit of operation cylinder inspiratory capacity；Unit of the throttle valve based on pressure sensor operation by flow is corrected by flow based on the throttle valve detected by gas flow transducer.
Description
Technical field
The present invention relates to a kind of control devices of internal combustion engine.
Background technique
All the time, the gas flow transducer (airflow sensor) using the air suction way for being assembled in internal combustion engine is realized
Actual measurement is inhaled into the air capacity of internal combustion engine, and the inhaled air volume based on actual measurement carries out the internal combustion of the control of fuel injection amount etc.
The control device of machine.Moreover, it is achieved that having recycles a part for the exhaust being discharged to exhaust channel simultaneously to air suction way
And control the control device of the internal combustion engine of the EGR controller of exhaust gas recirculation quantity.Further more, realizing in suction and discharge
Valve has variable valve mechanism, and controls the control device of the phase of air inlet-exhaust valve or the internal combustion engine of lift (lift) amount.
In patent document 1, sucking obtained from having the detection operating lag based on compensation current sensor is disclosed
Air capacity and the pressure of inspiration(Pi) variable quantity detected by the air-breathing pressure sensor in throttle valve downstream side, operation are inhaled into inflator
The unit of first air capacity, inhaled air volume obtained from the detection operating lag based on non-compensation current sensor and by saving
The pressure of inspiration(Pi) variable quantity of the air-breathing pressure sensor detection in valve downstream side is flowed, operation is inhaled into the list of the second air capacity in inflator
Member switches first air capacity and the second air capacity corresponding to the operating condition of internal combustion engine, carries out fuel injection control etc.
The control device of the internal combustion engine of control.According to the technology, since the detection operating lag of gas flow transducer is compensated, it is thus possible to
Improve control precision when transition.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2009-138590 bulletin
Summary of the invention
Problem to be solved by the invention
However, in the technology of patent document 1, due to the suction in the throttle valve downstream side that exhaust gas recirculation quantity changes and generates
The variation of air pressure is not considered in the operation for the air capacity being inhaled into inflator, therefore, the air being inhaled into inflator
The operational precision of amount deteriorates.Accordingly, there exist what can not be applicable in the internal combustion engine for having EGR controller to ask
Topic.In addition, the variation of the pressure of inspiration(Pi) in the throttle valve downstream side generated based on the phase or lift amount variation by air inlet-exhaust valve
Carry out the variation for the air capacity that operation is inhaled into inflator, therefore, it is impossible to which the phase or lift amount that capture air inlet-exhaust valve are sharply
Air capacity variation in inflator when variation, to there are problems that controlling precision deteriorates.
The present invention is careful studied in view of above-mentioned problem as a result, it is intended that even if in exhaust gas recirculatioon
Control device or air inlet-exhaust valve have in the internal combustion engine of variable valve mechanism, can also based on gas flow transducer and pressure sensor come
The precisely air capacity that operation is flowed into inflator, and make the precision for using it to improve internal combustion engine control.
Technical means to solve problem
To solve the above-mentioned problems, control device of the invention be the upstream of throttle valve have gas flow transducer and
The downstream of throttle valve has the control device of the internal combustion engine of pressure sensor, and the control device has: arithmetic element, is based on institute
State pressure sensor come throttle valve described in operation by flow, based on the throttle valve after the operation by flow come operation section
The pressure in valve downstream is flowed, based on the throttle downstream pressure after the operation, operation is flowed into the inspiratory capacity in inflator；And it repairs
Positive unit corrects the throttling based on the pressure sensor operation by flow based on the throttle valve detected by gas flow transducer
Valve is by flow, the modified unit amendment throttle characteristics value and sensor characteristics value, so that being based on the pressure
The throttle valve of sensor presumption is rule by the difference that flow passes through flow with the throttle valve based on gas flow transducer detection
Below definite value.
The effect of invention
According to the present invention, based on pressure sensor come operation throttle valve by flow, it is logical based on the throttle valve after operation
The pressure in inflow-rate of water turbine operation throttle valve downstream, based on the throttle downstream pressure after operation, operation is inhaled into the sky in inflator
Tolerance.It can suitably consider the variation due to the pressure of inspiration(Pi) in the throttle valve downstream side that exhaust gas recirculation quantity changes and generates to section
Therefore stream influence of the valve by flow can prevent the deterioration of the control precision of internal combustion engine.Further more, due to can suitably examine
Therefore throttle valve when considering the phase or lift change dramatically of air inlet-exhaust valve can prevent internal combustion engine by the variation of flow
Control precision deterioration.In addition, due to successively being corrected based on gas flow transducer and pressure sensor due to deteriorating at any time
Influence and the discharge characteristic of the response characteristic of gas flow transducer or throttle valve that changes therefore being capable of precisely operation
The air capacity being inhaled into inflator, and can be improved the control precision of internal combustion engine.
Detailed description of the invention
Fig. 1 is the figure for illustrating the system structure of embodiments of the present invention 1.
Fig. 2 is the figure for illustrating the method for the EGR control to rotation speed and load.
Fig. 3 is the throttling for illustrating the variation (A → B) relative to load direction centainly obtained by the rotation speed in Fig. 2
The variation of the setting method, pressure of inspiration(Pi) based on its variation and EGR rate of valve opening, EGR valve aperture, air inlet-exhaust valve phase
Figure.
Fig. 4 is illustrated using in being controlled based on the air capacity of the detected value operation of gas flow transducer being flowed into inflator
The figure of the process of the method for combustion engine.
Fig. 5 is illustrated using in being controlled based on the air capacity of the detected value operation of pressure sensor being flowed into inflator
The figure of the process of the method for combustion engine.
Fig. 6 be illustrate using the detected value operation based on gas flow transducer the first air capacity being flowed into inflator and
The process of the method for internal combustion engine is controlled based on the second air capacity of the detected value operation of pressure sensor being flowed into inflator
Figure.
Fig. 7 is the figure for illustrating the process of control method of internal combustion engine performed in the present invention.
Fig. 8 is the figure for illustrating the model flowed in required air intake duct in metering air and EGR.
Fig. 9 is the block diagram for illustrating to control fuel injection and time of ignition based on gas flow transducer and pressure sensor
Figure.
Figure 10 is to illustrate that the detected value operation throttle valve based on pressure sensor passes through air capacity, and repaired by gas flow transducer
Throttle valve after the just described operation passes through the figure of the block diagram of air capacity.
Figure 11 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, throttle valve pass through the detected value of flow or the figure with the difference of true value of operation values.
Figure 12 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, the detected value of pressure of inspiration(Pi) or the figure with the difference of true value of operation values.
Figure 13 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, the detected value of air capacity that is flowed into inflator or operation values generate with the difference of true value and because of difference
The figure of the difference of the behavior of exhaust air-fuel ratio.
Figure 14 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, throttle valve pass through the detected value of flow or the figure of the difference of operation values.
Figure 15 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, the detected value of pressure of inspiration(Pi) or the figure with the difference of true value of operation values.
Figure 16 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, the detected value of air capacity that is flowed into inflator or operation values generate with the difference of true value and because of difference
The figure of the difference of the behavior of exhaust air-fuel ratio.
Figure 17 is throttle flow rate, the air-breathing illustrated by air metering method of the invention 3., for operation or detection
Pressure, inflator flow into each, the throttle valve that generates based on gas flow transducer amendment due to being stained for throttle valve of air capacity
The figure with the difference of true value under the case where variation of discharge characteristic and not modified situation.
Figure 18 is that explanation has from a part of turbine downstream portion for the exhaust being discharged to exhaust channel to upstream of compressor
The air suction way in portion recycles and controls the system knot of the embodiment 2 of the EGR controller of exhaust gas recirculation quantity
The figure of structure.
Figure 19 is the figure for illustrating the method for the EGR control in the system of embodiment 2 to rotation speed and load.
Figure 20 be illustrate in the system of embodiment 2 based on gas flow transducer and pressure sensor control fuel injection with
And in time of ignition in required cylinder the block diagram of inhaled air volume figure.
Figure 21 is to illustrate that the detected value operation negative pressure valve in the system of embodiment 2 based on pressure sensor passes through air
It measures and the negative pressure valve after the operation is corrected by gas flow transducer and pass through the figure of the block diagram of air capacity.
Specific embodiment
Hereinafter, being based on attached drawing, embodiments of the present invention will be described.
Fig. 1 is the figure for illustrating the system structure of embodiments of the present invention 1.The system of present embodiment has internal combustion engine 1.
Air-breathing flow path and exhaust flow path are communicated in internal combustion engine 1.Gas flow transducer 2 is assembled in air-breathing flow path and is built in air-flow
The suction temperature sensor of sensor 2.In the downstream of gas flow transducer 2, equipped with for reducing air-breathing flow path and controlling inflow
To the throttle valve 3 of the inhaled air volume of cylinder.Throttle valve 3 be can with throttle pedal (throttle pedal) amount of stepping on is independently
Control the electronic control type throttle valve of valve opening.There is induction mnifold 4 in the communicating downstream of throttle valve 3.It is assembled in induction mnifold 4
Inspiratory pressure sensor 5.In the downstream of induction mnifold 4, configured with being flowed in stiffened cylinder by generating bias current in air-breathing
Disorder flowing strengthen valve 6.Configured with the fuel injection valve 7 injected fuel directly into inflator in inflator.Internal combustion engine 1
In the variable valve mechanism that inlet valve 8 and exhaust valve 10 change with having the Phase Continuation for being opened and closed valve respectively.In vario valve machine
Structure is assembled in inlet valve 8 and exhaust valve 10 for detecting the sensor 9 and 11 of opening and closing phase of valve respectively.In cylinder head
Portion, which is assembled with, is exposed to electrode portion in cylinder, and by the spark plug of spark ignition combustion mixture 12.Further more, in cylinder block
It is assembled with the detonation sensor 13 of the generation of detection pinking.Crank angle sensor 14 is assembled in crank axle.Based on from crank
The signal that angular transducer 14 exports, is able to detect the rotation speed of internal combustion engine 1.Air-fuel ratio sensor is assembled in exhaust flow path
15, feedback control is carried out based on air-fuel ratio sensor testing result so as to become from the fuel injection amount that fuel injection valve 7 supplies
Target air-fuel ratio.In the downstream of air-fuel ratio sensor 15, be provided with exhaust emission control catalyst 16, carbon monoxide, nitrogen oxides with
And harmful discharge gas componant of unburned hydrocarbon etc. is cleaned by catalyst reaction.In the downstream of exhaust emission control catalyst 16,
It is assembled with the lambda sensor 17 of the presence or absence of oxygen of exhaust after detection exhaust emission control catalyst passes through.It is communicated with from exhaust gas purification and urges
The downstream of agent 16 shunt and make to induction mnifold 4 to exhaust the EGR pipe 18 of exhaust gas recirculation.It is equipped in EGR pipe 18 useful
In the cooling equipment 19 of the EGR of cooling EGR.In the downstream of the cooling equipment 19 of EGR equipped with the EGR valve 22 for controlling EGR flow.
The temperature sensor 20 that is assembled with the temperature of the EGR of the upstream portion for detecting EGR valve 22, the upstream for detecting EGR valve 22
The pressure sensor 21 of the pressure in portion.The system of present embodiment has ECU(Electronic Control as shown in Figure 1
Unit, electronic control unit) 23.Above-mentioned various sensors and various actuators are connected in ECU23.Throttle valve 3, fuel spray
The actuator for penetrating valve 7, the air inlet-exhaust valve 8 with changeable mechanism and 10, EGR valve 22 etc. is controlled by ECU23.Further more, based on from
The signal of above-mentioned various sensors input, detect the operating condition of internal combustion engine 1, is being determined according to operating condition by ECU23
Moment spark plug 12 is lighted a fire.
Fig. 2 is the figure for illustrating the method for the EGR control to the rotation speed and load of internal combustion engine 1.In low rotation speed and
Under the conditions of low-load, by importing internal EGR by suction and discharge phase variable valve, to reduce pumping loss.More than middle load
Under loading condition, by importing the external EGR cooling by the cooling equipment of EGR, to reduce the Frequency or exhaust temperature of pinking
Degree.Due to being not necessarily to carry out the fuel increment control by delivery temperature reducing effect as a purpose, it can reduce combustion
Take.
Fig. 3 is the throttling for illustrating the variation (A → B) relative to load direction centainly obtained by the rotation speed in Fig. 2
The variation of the setting method, pressure of inspiration(Pi) based on its variation and EGR rate of valve opening, EGR valve aperture, air inlet-exhaust valve phase
Figure.In low-load region, by making inlet valve phase delay angling, so as to reduce actual effect compression ratio and drop can be passed through
The low negative suction into cylinder reduces pumping loss.In addition, make at the same time exc. angle postpone angling, to internal EGR into
Row increment, to reduce pumping loss.On the other hand, under middle load conditions above, make exc. angle into angling to top dead-centre
Near, in a manner of reducing internal EGR and keep total EGR rate, increase EGR valve aperture, and increase external EGR.External EGR makes
Therefore fuel consumption can be reduced by pinking and the reduction of delivery temperature by the cooling exhaust gas recirculation of the cooling equipment of EGR.
Fig. 4 is illustrated using in being controlled based on the air capacity of the detected value operation of gas flow transducer being flowed into inflator
The figure of the process of the method for combustion engine.In the method, in step 401, pass through sky using gas flow transducer to detect throttle valve
Throughput.In step 402, it is calculated based on throttle valve by air mass flow and the air mass flow being inhaled into inflator
Enter the revenue and expenditure of the air capacity in air intake duct, temperature and pressure in operation air intake duct.In step 403, based in air intake duct
Temperature and pressure, operation is inhaled into the air mass flow in inflator.In step 404, based on being inhaled into inflator
Air mass flow controls fuel injection.In step 405, based on the air mass flow being inhaled into inflator come when controlling igniting
It carves.According to this method, fuel injection or time of ignition are controlled based on the measured value of gas flow transducer, accordingly, with respect to internal combustion
The state change of machine can be realized healthy and strong control.On the other hand, there is detection delay in gas flow transducer, therefore, if
Delay compensation is not implemented to testing result, then there are problems that controlling precision in the transition of internal combustion engine deteriorates.
Fig. 5 is illustrated using in being controlled based on the air capacity of the detected value operation of pressure sensor being flowed into inflator
The figure of the process of the method for combustion engine.In the method, in step 501, using the pressure sensor for being provided to throttle valve downstream
To detect pressure of inspiration(Pi).In step 502, the air mass flow being inhaled into inflator is controlled based on pressure of inspiration(Pi).In step
In 503, fuel injection is controlled based on the air mass flow being inhaled into inflator.In step 504, based on being inhaled into inflator
Interior air mass flow controls time of ignition.According to this method, due to pressure sensor compared with gas flow transducer responsiveness
Therefore height even if not implementing delay compensation relative to testing result, will not be seen and control precision in the transition of internal combustion engine
Deterioration.On the other hand, it converts from the pressure of air intake duct, by the air capacity being flowed into inflator, if accordingly, there exist internal combustions
The state of machine changes, and controls the problem of precision deteriorates.
Fig. 6 be illustrate using the detected value operation based on gas flow transducer the first air capacity being flowed into inflator and
The process of the method for internal combustion engine is controlled based on the second air capacity of the detected value operation of pressure sensor being flowed into inflator
Figure.In the method, in step 601, stablizing for internal combustion engine is carried out to determine.If it is determined that stable state, then in step
In 602, pass through air mass flow using gas flow transducer to detect throttle valve.In step 603, air stream is passed through based on throttle valve
Measure and be inhaled into the air mass flow in inflator, operation enters and leaves the revenue and expenditure of the air capacity in air intake duct, in union air intake duct
Temperature and pressure.In step 604, based on the temperature and pressure in air intake duct, operation is inhaled into inflator
One air mass flow.On the other hand, if it is decided that then in step 605 use the pressure being equipped in throttle valve downstream for transition state
Force snesor detects pressure of inspiration(Pi).In step 606, the second air being inhaled into based on pressure of inspiration(Pi) come operation in inflator
Flow.In step 607, fuel injection is controlled based on the air mass flow being inhaled into inflator.In step 608, it is based on
The air mass flow in inflator is inhaled into control time of ignition.According to this method, when stablizing based on the reality of gas flow transducer
Measured value controls fuel injection or time of ignition, can be realized healthy and strong control accordingly, with respect to the state of internal combustion engine.Further more,
The air stream in inflator is inhaled into come operation based on the pressure of inspiration(Pi) by the high pressure sensor detection of responsiveness in transition
Amount, therefore, can prevent precision when transition from deteriorating.However, due to making by different under stable state and transition state
The air mass flow of method operation corresponds to the structure that operating condition switches over, and therefore, generates scale in switching, thus in the presence of
The problem of control precision deteriorates.
Fig. 7 is the figure for illustrating the process of control method of internal combustion engine performed in the present invention.In the method, in step
In 701, pressure of inspiration(Pi) is detected using the pressure sensor being equipped in throttle valve downstream.In a step 702, based on detected
Pressure of inspiration(Pi) carrys out operation throttle valve and passes through flow.In step 703, pass through flow using gas flow transducer detection throttle valve.?
In step 704, detected according to the throttle valve based on pressure of inspiration(Pi) detected value operation by flow and using gas flow transducer
Throttle valve is successively same to determine the discharge characteristic of throttle valve and the sensor characteristics of gas flow transducer by flow.Based on same fixed
As a result, successively correcting the throttle valve based on pressure of inspiration(Pi) detected value operation passes through flow and the section detected using gas flow transducer
Stream valve passes through flow.Here, the discharge characteristic of so-called throttle valve, is the discharge coefficient of throttle valve.The discharge coefficient of throttle valve is
Using the rotation speed of internal combustion engine and valve opening as the function of parameter or table, each internal combustion engine rotation speed and
The level of valve opening is determined result and is updated the function of the discharge coefficient or table with constant current coefficient of discharge using same.In addition, institute
The sensor characteristics for calling gas flow transducer, is time constant.Time constant be using flow as the function of parameter or table,
Each flow is determined result and is updated the function of the time constant or table with fixing time constant using same.In step 705
In, based on successively modified throttle valve by flow and the air mass flow being flowed into inflator, implement revenue and expenditure operation, operation is inhaled
Endotracheal pressure and temperature.In step 706, the pressure and temperature in the air intake duct based on operation, operation are flowed into
Air mass flow in inflator.In step 707, based on the air mass flow being inhaled into inflator, fuel injection is controlled.In step
In 708, based on the air mass flow being inhaled into inflator, time of ignition is controlled.According to this method, inflator when transition flows into empty
The responsiveness of tolerance operation by speed limit in the responsiveness of pressure sensor, therefore, in transition without lingeringly operation cylinder
Flow into air capacity.In addition, also can be used even if making the discharge characteristic of throttle valve change due to attachment of deposit etc.
The discharge characteristic of throttle valve is corrected by inspiratory flow that gas flow transducer directly detects, therefore, inflator when stablizing flows into empty
The robustness of tolerance operational precision is high.No matter further more, transition or stabilization, due to successively correcting the discharge characteristic or air-flow of throttle valve
Therefore the variation of the sensor characteristics of sensor does not generate scale in transition and stable switching.In exhaust gas recirculatioon or can
It can implement above-mentioned amendment when becoming the movement of valve, and can be suitable for having the interior of exhaust gas re-circulation apparatus or variable valve mechanism
In combustion engine.It therefore, can also be with precision even in the transition for the internal combustion engine for having exhaust gas re-circulation apparatus or variable valve mechanism
Well perform the control of fuel injection or time of ignition.Here, explanation with determine throttle characteristics (discharge coefficient) and
The algorithm of gas flow transducer characteristic (time constant).Throttle flow rate can be acquired by formula (1).
... formula (1)
Here, μthIt is the discharge coefficient of throttle valve, AthIt is the opening area of throttle valve, κ is specific heat ratio, and R is that gas is normal
Number.On the other hand, if it is assumed that postponing behavior for gas flow transducer can be then able to use by time lag of first order element approximation
By the detected value of gas flow transducer primary progress element as input and by formula (2) come the genuine throttle flow rate of operation.
... formula (2)
Here, τafsIt is the time constant of gas flow transducer, Δ t is sample time.If formula (1) and formula (2) are equal,
Obtain following relationships.
... formula (3)
Here, k is number of steps.If arranged formula (3), such simultaneous equations shown in formula (4) is obtained.
X (k)=φ (k)Tθ (k) ... formula (4)
Based on formula (4), determined together using two multiplication algorithm of successive minima of forgetting element is considered throttle flow rate coefficient with
And the time constant of gas flow transducer.
X (k)=φT(k) θ (k)+ε (k) ... formula (5)
Here, λ is to forget element, it is generally set between 0.97 to 0.995.By arithmetic expression repeatedly (5), thus successively
It updates θ (k), throttle flow rate coefficient μ can be acquired by θ (k)thAnd the timeconstantτ of gas flow transducerafs.In the present invention
In, successively in fixed parameter, throttle flow rate coefficient is being selected, still, the present invention is not limited to this, even if in throttle valve
Pressure loss coefficient is set in discharge coefficient, and identical effect also may be implemented.In addition, in the approximation of gas flow transducer detection delay
Time lag of first order is assumed, but it is also possible to set the function of dead time or secondary delay system or more.
Fig. 8 is the figure for illustrating the model flowed in required air intake duct in metering air and EGR.The sky of throttle valve
Throughput can directly be detected by the gas flow transducer 2 for being installed on the upstream of throttle valve.On the other hand, based on by being installed on throttling
The pressure of inspiration(Pi) of the detection of pressure sensor 5 in the downstream of valve, the air-breathing detected by the temperature sensor for being built in gas flow transducer
Temperature, throttle valve opening are able to use above-mentioned formula (1) and carry out operation throttle flow rate.Detection EGR is installed in the upstream of EGR valve
Temperature EGR temperature sensor, detect EGR pressure EGR pressure sensor.Upstream pressure and upstream based on EGR valve
Temperature, the pressure of inspiration(Pi), EGR valve aperture can pass through the flow of the exhaust of EGR valve by formula (6) operation.
... formula (6)
Here, μegrvIt is the discharge coefficient of EGR valve, AegrvIt is the opening area of EGR valve.By the air in air-breathing to inflator
Flow is able to use the quantity of state of air intake duct and by formula (7) operation.
... formula (7)
Here, ncylIt is the inflator number of internal combustion engine, VsIt is swept volume, ηinIt is gettering efficiency, NeIt is the rotation speed of internal combustion engine
Degree.ηinIt is the function or table of the rotation speed of internal combustion engine, load and air inlet-exhaust valve phase.Using these flows and by formula
(8) implement the revenue and expenditure operation in air intake duct.
... (formula 8)
Here, h is enthalpy, e is whole energy, and r is EGR rate.In addition, being by sensor in the system of present embodiment
Detect EGR valve upstream temperature and upstream pressure structure, still, the present invention is not limited to this, as by EGR pressure with
And EGR temperature is recorded on the map of rotation speed and load and identical effect also may be implemented by the mode that map operation is sought
Fruit.In addition, being by the upstream temperature and upstream pressure union of sensor detection EGR valve in the system of present embodiment
The structure of EGR flow, still, the present invention is not limited to this, as seek from by be provided to throttle valve downstream portion pressure pass
In the pressure (total pressure) of sensor detection, the air partial pressure fortune based on throttle valve by the throttle valve downstream portion of flow operation is subtracted
Identical effect also may be implemented in the mode of the EGR rate of calculation.
Fig. 9 is to illustrate the block diagram based on gas flow transducer and pressure sensor control fuel injection and time of ignition
Figure.According to this method, in frame 901, based on gas flow transducer, throttle valve opening, atmospheric pressure, by being built in gas flow transducer
The atmospheric temperature and pressure of inspiration(Pi), operation throttle valve are detected by the pressure sensor in throttle valve downstream that temperature sensor detects
Pass through flow.In box 902, based on pressure of inspiration(Pi), EGR valve aperture, EGR valve upstream temperature, EGR valve upstream pressure come operation
EGR valve passes through flow.In frame 903, based on throttle valve by flow, EGR valve by flow, quantity of state in air intake duct (pressure,
Temperature, EGR rate), inhaled air volume carries out total gas revenue and expenditure operation in air intake duct in inflator.In frame 904, it is based on EGR valve
EGR in air intake duct is carried out by inhaled air volume in quantity of state in flow, air intake duct (pressure, temperature, EGR rate), inflator to receive
Branch operation.In frame 905, based on air capacity and EGR amount, the atmospheric temperature and EGR valve upstream temperature in air intake duct, operation
Quantity of state (pressure, temperature, EGR rate) in air intake duct.In frame 906, rotation speed, air inlet-exhaust valve phase based on internal combustion engine,
Quantity of state (pressure, temperature, EGR rate) to flow into air capacity in operation inflator in air intake duct.In block 907, based on internal combustion engine
Air capacity is flowed into rotation speed, inflator carrys out operation target air-fuel ratio.In frame 908, rotation speed, inflator based on internal combustion engine
Interior inflow air capacity, target air-fuel ratio carry out operation injection pulse width.In frame 908, rotation speed, inflator based on internal combustion engine
Quantity of state (pressure, temperature, EGR rate) carrys out operation time of ignition in interior inflow air capacity, air intake duct.With this configuration, thus
Even can also precisely execute combustion in the transition for the internal combustion engine for having exhaust gas re-circulation apparatus or variable valve mechanism
Material injection or the control of time of ignition.
Figure 10 be illustrate the detected value based on pressure sensor come operation throttle valve by air capacity, and by gas flow transducer
Throttle valve after correcting the operation passes through the figure of the block diagram of air capacity.It is opened in frame 1001 based on throttle valve according to this method
Degree, throttle valve upstream pressure, throttle valve upstream temperature, throttle downstream pressure carry out operation throttle flow rate.In frame 1002, make
Gas flow transducer detected value after the amendment being had modified with throttle flow rate, the consideration sensor characteristics after above-mentioned operation, with fixed
Throttle characteristics.Here, using should be with fixed parameter as the discharge coefficient of throttle valve.Discharge coefficient is by internal combustion engine
The function or table of rotation speed and valve opening as parameter, it is same in the rotation speed of each internal combustion engine and the level of valve opening
Constant current coefficient of discharge is determined result and is updated the function of discharge coefficient or table based on same.In frame 1003, based on after above-mentioned operation
Throttle flow rate, throttle characteristics it is same fixed as a result, amendment throttle flow rate operation values.In frame 1004, it is based on gas
Throttle flow rate operation values after flow sensor detected value, the amendment for considering throttle characteristics and having modified are passed with air-flow is determined
The sensor characteristics of sensor.Here, using should be with fixed parameter as gas flow transducer time constant.Time constant is by flow
As the function or table of parameter, in each flow with constant of fixing time, based on the same function for determining result renewal time constant
Or table.In frame 1005, the same of sensor characteristics based on gas flow transducer detected value, gas flow transducer is determined as a result, repairing
Healthy tendency flow sensor detected value.Block diagram shown in Fig. 10 is applied in the frame 901 of block diagram shown in Fig. 9.At this point, for frame
It, can be using in revised throttle flow rate operation values or revised gas flow transducer detected value for 901 output
Either one or two of.According to this method, the responsiveness that inflator when transition flows into air capacity operation is equivalent to the response of pressure sensor
Property, therefore, air capacity is flowed into without lingeringly operation cylinder in transition.In addition, even if attached due to deposit
It is equal and the discharge characteristic of throttle valve is made to change, the inspiratory flow that is directly detected by gas flow transducer can be used also to repair
The discharge characteristic of positive throttle valve, therefore, the robustness that inflator when stablizing flows into air capacity operational precision are high.No matter further more, mistake
It crosses or stablizes, due to successively correcting the variation of the discharge characteristic of throttle valve or the sensor characteristics of gas flow transducer, in mistake
It crosses and when stable switching does not generate scale.It can implement above-mentioned amendment in exhaust gas recirculatioon or the movement of vario valve, and
It can be suitable for the internal combustion engine for having exhaust gas re-circulation apparatus or variable valve mechanism.
Figure 11 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, throttle valve pass through the detected value of flow or the figure with the difference of true value of operation values.Here, so-called air metering method
1. being the method shown in Fig. 4 for the air capacity being only flowed by gas flow transducer operation in inflator, so-called air metering method
2. being the method shown in fig. 5 for the air capacity being only flowed by pressure sensor operation in inflator, further more, so-called air meter
3. amount method, is Fig. 7 institute for carrying out the air capacity that operation is flowed into inflator using the both sides of gas flow transducer and pressure sensor
The method shown.In moment T0If sharply opening throttle valve, the true value of throttle flow rate temporarily overshoots (overshoot),
After show stationary value.However, air metering method 1. in, by gas flow transducer detection throttle flow rate by air-flow sense
The restriction of the responsiveness of device and relative to true value with postpone and elapse.On the other hand, air metering method 3. in, based on section
The pressure sensor of relatively high response for flowing valve downstream carrys out operation throttle flow rate, and therefore, high can responsively capture can be with
The behavior for the overshoot that true value is seen.
Figure 12 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, the detected value of pressure of inspiration(Pi) or the figure with the difference of true value of operation values.In moment T0If sharply opening throttle valve,
Then the true value of pressure of inspiration(Pi) is increased with the behavior of time lag of first order, shows stationary value thereafter.However, air metering method 1. in,
It with delay and is elapsed by the pressure of inspiration(Pi) of gas flow transducer detected value operation relative to true value.Air metering method 2. in,
Pressure sensor based on relatively high response directly detects pressure of inspiration(Pi), therefore, high can responsively capture true value.In addition,
Air metering method 3. in, according to the throttle flow rate based on pressure sensor detected value operation come operation pressure of inspiration(Pi), because
This, can with air metering method is 2. to same extent high responsively captures true value.
Figure 13 is the acceleration environment for illustrating the difference due to air metering method, increasing throttle valve opening from low-load state
Under, the detected value of air capacity that is flowed into inflator or operation values generate with the difference of true value and because of difference
The figure of the difference of the behavior of exhaust air-fuel ratio.In moment T0If sharply opening throttle valve, the true value and air-breathing of cylinder mass flow
The passage of pressure is identical, is increased with the behavior of time lag of first order, shows stationary value thereafter.However, air metering method 1. in, with
The passage of pressure of inspiration(Pi) operation result based on gas flow transducer detected value is identical, with delay and elapses relative to true value.?
Air metering method 2. in, using the pressure of inspiration(Pi) that the pressure sensor by relatively high response directly detects come operation cylinder stream
Therefore amount high can responsively capture transition behavior.However, if due to environmental change, the deterioration at any time of internal combustion engine or consolidating
Body deviation etc. and the relationship change for making pressure and cylinder mass flow then generate in the operation values of cylinder mass flow and stablize deviation.Relatively
In this, air metering method 3. in, be based on pressure sensor detected value operation throttle flow rate, and be based on this operation pressure of inspiration(Pi)
Power, therefore, can with air metering method is 2. to same extent high responsively captures true value.Due to being corrected by gas flow transducer,
Therefore, the stabilization deviation due to environmental change, the deterioration at any time of internal combustion engine or solid deviation etc. will not be generated.If base
Carry out fuel injection control in the cylinder mass flow of such operation, then air metering method 1. in, generated in inclined side when acceleration
Transient error.Air metering method 2. in, it is suppressed that the transient error that can be seen when acceleration, on the other hand, generate due to
The stabilization deviation of environmental change, the deterioration at any time of internal combustion engine or solid deviation etc..Air metering method 3. in, when stablizing
And target air-fuel ratio can be precisely tracked when transition.
Figure 14 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, throttle valve pass through the detected value of flow or the figure with the difference of true value of operation values.In moment T0If sharply closed
Throttle valve, then the true value of throttle flow rate is proportionally reduced with throttle valve opening, shows stationary value thereafter.However, in air
Metering method 1. in, by gas flow transducer detection throttle flow rate by gas flow transducer responsiveness restriction and relative to
True value is with delay and elapses.On the other hand, air metering method 3. in, the pressure of the relatively high response based on throttle valve downstream
The detected value of force snesor carrys out operation throttle flow rate, and therefore, high can responsively capture can be considered that the throttle valve of true value passes through
The reduction process of flow.
Figure 15 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, the detected value of pressure of inspiration(Pi) or the figure with the difference of true value of operation values.In moment T0If sharply closing throttle valve,
Then the true value of pressure of inspiration(Pi) is reduced with the behavior of time lag of first order, shows stationary value thereafter.However, air metering method 1. in,
Pressure of inspiration(Pi) based on gas flow transducer detected value operation with delay and is elapsed relative to true value.Air metering method 2.
In, pressure of inspiration(Pi) is directly detected by the pressure sensor of relatively high response, therefore, high can responsively capture true value.In addition,
Air metering method 3. in, according to the throttle flow rate based on pressure sensor detected value operation come operation pressure of inspiration(Pi), because
This, can with air metering method is 2. to same extent high responsively captures true value.
Figure 16 is the deceleration conditions for illustrating the difference due to air metering method, reducing throttle valve opening from high load condition
Under, the detected value of air capacity that is flowed into inflator or operation values generate with the difference of true value and because of difference
The figure of the difference of the behavior of exhaust air-fuel ratio.In moment T0If sharply closing throttle valve, the true value and air-breathing of cylinder mass flow
The passage of pressure is identical, is reduced with the behavior of time lag of first order, shows stationary value thereafter.However, air metering method 1. in, with
The passage of pressure of inspiration(Pi) operation result based on gas flow transducer detected value is identical, with delay and elapses relative to true value.?
Air metering method 2. in, using the pressure of inspiration(Pi) that the pressure sensor by relatively high response directly detects come operation cylinder stream
Therefore amount high can responsively capture transition behavior.However, if due to environmental change, the deterioration at any time of internal combustion engine or consolidating
Body deviation etc. and the relationship change for making pressure and cylinder mass flow then generate in the operation values of cylinder mass flow and stablize deviation.Relatively
In this, air metering method 3. in, be based on pressure sensor detected value operation throttle flow rate, and be based on this operation pressure of inspiration(Pi)
Power, therefore, can with air metering method is 2. to same extent high responsively captures true value.Due to being corrected by gas flow transducer,
Therefore, the stabilization deviation due to environmental change, the deterioration at any time of internal combustion engine or solid deviation etc. will not be generated.If base
Carry out fuel injection control in the cylinder mass flow of such operation, then air metering method 1. in, generated in inclined side when deceleration
Transient error.Air metering method 2. in, it is suppressed that the transient error that can be seen when deceleration, on the other hand, generate due to
The stabilization deviation of environmental change, the deterioration at any time of internal combustion engine or solid deviation etc..Air metering method 3. in, when stablizing
And target air-fuel ratio can be precisely tracked when transition.
Figure 17 is throttle flow rate, the air-breathing illustrated by air metering method of the invention 3., for operation or detection
Pressure, inflator flow into each, the throttle valve that generates based on gas flow transducer amendment due to being stained for throttle valve of air capacity
The figure with the difference of true value under the case where variation of discharge characteristic and not modified situation.It, can be with here, as an example
Enumerate (the valve dirt of deterioration at any time under the rotation speed certain condition of throttle valve opening and internal combustion engine, along with throttle valve
Damage) discharge coefficient reduce when behavior.If starting generation valve to be stained, the discharge coefficient of throttle valve is reduced.Throttle valve stream
Coefficient of discharge, applied value is initially set under conditions of due in the factory of internal combustion engine, without discharge coefficient
In modified situation, since valve is stained, discharge coefficient deviates from from true value.On the other hand, due to directly being examined in gas flow transducer
Throttle flow rate is surveyed, therefore can be captured since valve is stained the flow-reduction of generation, by using the measured value of gas flow transducer
Successively modified flow rate coefficient, so as to capture the reduction of discharge coefficient.If start generate valve be stained, throttle flow rate with
The reduction of throttle flow rate coefficient is reduced together.For throttle flow rate coefficient, in the state of setting initial value not
It carries out in the modified situation of discharge coefficient, will not change generating valve and being stained the operation result of throttle flow rate, therefore, from
True value deviates from.On the other hand, it due to directly detecting throttle flow rate in gas flow transducer, can capture since valve is stained
The flow-reduction of generation carrys out modified flow rate coefficient by using the measured value of gas flow transducer and using the discharge coefficient having modified
Carry out operation throttle flow rate, so as to capture the reduction of throttle flow rate.If start generate valve be stained, pressure of inspiration(Pi) with
The reduction of throttle flow rate is reduced together.In contrast, for throttle flow rate coefficient, in the state for setting initial value
Under without carrying out operation pressure of inspiration(Pi) using the throttle flow rate operation values of excessive evaluation in the modified situation of discharge coefficient, because
This, based on pressure of inspiration(Pi) operation result also by excessive evaluation.On the other hand, stream is being corrected using the measured value of gas flow transducer
In the case where coefficient of discharge, the reduction of pressure of inspiration(Pi) can be captured.If starting generation valve to be stained, cylinder mass flow and pressure of inspiration(Pi)
Reduction reduce together.In contrast, for throttle flow rate coefficient, without stream in the state of setting initial value
In the modified situation of coefficient of discharge, carry out operation cylinder mass flow using the pressure of inspiration(Pi) of excessive evaluation, therefore, is based on cylinder mass flow operation
As a result also by excessive evaluation.It on the other hand, can in the case where the measured value using gas flow transducer carrys out modified flow rate coefficient
Capture the reduction of cylinder mass flow.As previously discussed, even if in the case where generation valve is stained, by using the reality of gas flow transducer
Measured value carrys out modified flow rate coefficient, so as to precisely carry out cylinder mass flow operation, and can be improved time of ignition or combustion
Expect the control precision of injection.
Figure 18 is that explanation has from a part of turbine downstream portion for the exhaust being discharged to exhaust channel to upstream of compressor
The air suction way in portion recycles and controls the system knot of the embodiment 2 of the EGR controller of exhaust gas recirculation quantity
The figure of structure.1 to 23 is identical as symbol shown in embodiment 1 illustrated by Fig. 1 in symbol shown in Figure 18, here, especially right
It is illustrated with the difference of embodiment 1.Equipped with turbocharger 24 in the system of embodiment 2.In gas flow transducer 2
Downstream, be assembled with negative pressure valve 27, be assembled with B/P EGR Back Pressure Transducer EGR 28 downstream.It is detected by B/P EGR Back Pressure Transducer EGR 28 from negative pressure valve 27
The pressure in the region until compressor 25, the feedback control negative pressure valve 27 in such a way that pressure detected becomes target negative pressure.
Thus EGR can be stably supplied when the low discharge control in EGR flow, and can be improved the precision of EGR rate control.
It is configured with turbine 26 in the downstream of exhaust valve, is configured with exhaust emission control catalyst 16 in the downstream of turbine 26.It is vented from row
The downstream of gas cleaning catalyst 16 is back to upstream of compressor.By becoming such system structure, thus even if in internal combustion engine
Mistake give under the conditions of EGR can also be stably supplied.
Figure 19 is the figure for illustrating the method for the EGR control in the system of embodiment 2 to rotation speed and load.?
Under the conditions of low rotation speed and low-load, by importing internal EGR by suction and discharge phase variable valve, to reduce pumping loss.
Under the loading condition comprising crossing the middle load to condition or more, by making the exhaust cooled by the cooling equipment of EGR from turbine
Machine downstream is flowed back to upstream of compressor, to reduce the Frequency or delivery temperature of pinking.Due to being not necessarily to will arrange
The fuel increment control of gas temperature decreasing effect as a purpose, therefore, can reduce fuel consumption.
Figure 20 be illustrate in the system of embodiment 2 based on gas flow transducer and pressure sensor control fuel injection with
And in time of ignition in required cylinder the block diagram of inhaled air volume figure.According to this method, in frame 2001, passed based on air-flow
Sensor, negative pressure valve opening, atmospheric pressure, by be built in gas flow transducer temperature sensor detect atmospheric temperature and by bearing
The negative pressure valve downstream pressure of the pressure sensor detection in pressure valve downstream, operation negative pressure valve pass through flow.In frame 2002, based on negative
Pressure valve downstream pressure, EGR valve aperture, EGR valve upstream temperature, EGR valve upstream pressure carry out operation EGR valve and pass through flow.In frame
In 2003, flow, negative pressure valve upstream quantity of state (pressure, temperature, EGR rate), section are passed through by flow, EGR valve based on negative pressure valve
Valve flow is flowed to carry out total gas revenue and expenditure operation of throttle valve upstream portion.In frame 2004, flow, throttling are passed through based on EGR valve
Valve upstream quantity of state (pressure, temperature, EGR rate), throttle flow rate carry out the EGR revenue and expenditure operation of throttle valve upstream portion.In frame
In 2005, air capacity and EGR amount, atmospheric temperature and EGR valve upstream temperature based on throttle valve upstream, on operation throttle valve
Free state amount (pressure, temperature, EGR rate).In frame 2006, based on throttle valve opening, throttle valve upstream quantity of state and throttling
Valve downstream condition amount, operation throttle valve pass through flow.In frame 2007, based on throttle flow rate, throttle valve upstream quantity of state (pressure
Power, temperature, EGR rate) and air-breathing to inflator in air mass flow, carry out throttle valve downstream portion total gas revenue and expenditure operation.?
In frame 2008, based in throttle flow rate, throttle valve upstream quantity of state (pressure, temperature, EGR rate) and air-breathing to inflator
Air mass flow carries out the EGR revenue and expenditure operation of throttle valve downstream portion.In frame 2009, air capacity based on throttle valve downstream and
EGR amount, throttle valve upstream quantity of state, operation throttle valve downstream condition amount (pressure, temperature, EGR rate).In frame 2010, it is based on
The rotation speed of internal combustion engine, air inlet-exhaust valve phase, quantity of state (pressure, temperature, EGR rate) comes in operation inflator to flow into air intake duct
Air capacity.With this configuration, even thus the internal combustion engine for having exhaust gas re-circulation apparatus or variable valve mechanism transition
When, air capacity can also be precisely flowed into operation inflator and can precisely execute fuel injection or time of ignition
Control.
Figure 21 is to illustrate that the detected value operation negative pressure valve in the system of embodiment 2 based on pressure sensor passes through air
It measures and the negative pressure valve after the operation is corrected by gas flow transducer and pass through the figure of the block diagram of air capacity.According to this method, in frame
In 2101, based on negative pressure valve opening, negative pressure valve upstream pressure, negative pressure valve upstream temperature, negative pressure valve downstream pressure come operation negative pressure
Valve passes through flow.In frame 2102, had modified using the negative pressure valve after above-mentioned operation by flow, consideration sensor characteristics
Gas flow transducer detected value after amendment, it is same to determine negative pressure valve discharge characteristic.Here, using should be with fixed parameter as the stream of negative pressure valve
Coefficient of discharge.In frame 2103, determined by flow, the same of negative pressure valve discharge characteristic as a result, repairing based on the negative pressure valve after above-mentioned operation
Positive and negative pressure valve flow operation values.In frame 2104, based on gas flow transducer detected value, considers negative pressure valve discharge characteristic and have modified
Amendment after negative pressure valve flow operation values, with determining the sensor characteristics of gas flow transducer.Here, using should with fixed parameter as
Gas flow transducer time constant.In frame 2105, based on gas flow transducer detected value, gas flow transducer sensor characteristics it is same
Determine as a result, amendment gas flow transducer detected value.Block diagram shown in Figure 21 is applied in the frame 2001 of block diagram shown in Figure 20.This
When, for the output of frame 2001, it can be sensed using revised negative pressure valve flow operation values or revised air-flow
Any of device detected value.According to this method, the responsiveness of inflator influx operation when transition is equivalent to pressure sensor
Responsiveness, therefore, in transition without lingeringly operation cylinder flow into air capacity.In addition, even if due to accumulation
Attachment of object etc. and so that the discharge characteristic of throttle valve is changed, the inspiratory flow directly detected by gas flow transducer also can be used
It measures to correct the discharge characteristic of negative pressure valve, therefore, the robustness that inflator when stablizing flows into air capacity operational precision is high.Further more,
No matter transition or stabilization, due to successively correcting the variation of the discharge characteristic of throttle valve or the sensor characteristics of gas flow transducer, because
This, does not generate scale in transition and stable switching.It can implement above-mentioned repair in exhaust gas recirculatioon or the movement of vario valve
It just, and can be suitable for the internal combustion engine for having exhaust gas re-circulation apparatus or variable valve mechanism.
As discussed above, according to one method of the present invention, has gas flow transducer in the upstream of throttle valve
And have pressure sensor in the downstream of throttle valve, based on throttle valve described in pressure sensor operation by flow, be based on
Throttle valve after operation passes through the pressure in flow operation throttle valve downstream, based on the throttle downstream pressure after operation, operation gas
Cylinder inspiratory capacity corrects the throttle valve based on pressure sensor operation by flow based on the throttle valve detected by gas flow transducer
By flow, throttle characteristics value and sensor characteristics value are corrected, so that the throttle valve based on pressure sensor presumption is logical
Inflow-rate of water turbine and the throttle valve based on gas flow transducer detection by the difference of flow are specified value hereinafter, therefore, when stablizing with
It, being capable of precisely operation cylinder inspiratory capacity and when transition.
In addition, other modes according to the present invention, have energy possessed by the gas that will be discharged from inflator by turbine
It is converted to power and sucks the turbocharger of air by compressor compresses, and have one of exhaust in the downstream of turbine
Divide and be recycled to the upstream of compressor and control the EGR controller of exhaust gas recirculation quantity, in the recycling of exhaust
The upstream of position has negative pressure valve, has B/P EGR Back Pressure Transducer EGR in the downstream of negative pressure valve, based on B/P EGR Back Pressure Transducer EGR come operation negative pressure valve
Throughput, the negative pressure valve based on B/P EGR Back Pressure Transducer EGR operation is corrected by flow based on the negative pressure valve detected by gas flow transducer
By flow, negative pressure valve discharge characteristic value and sensor characteristics value are corrected, so that the negative pressure valve based on B/P EGR Back Pressure Transducer EGR presumption is logical
Inflow-rate of water turbine and the negative pressure valve based on gas flow transducer detection by the difference of flow are specified value hereinafter, therefore, when stablizing with
It, being capable of precisely operation cylinder inspiratory capacity and when transition.
In addition, other modes according to the present invention, the cylinder based on the unitary operation of cylinder inspiratory capacity as described in operation is inhaled
Therefore tolerance when stablizing and when transition, can be controlled precisely to control the unit of fuel injection amount and time of ignition
Fuel injection amount and time of ignition processed, and internal combustion engine can be suitably controlled.
In addition, other modes according to the present invention, flow throttle characteristics value or negative pressure valve discharge characteristic value
Coefficient of discharge, therefore, the variation of discharge coefficient that can will be stained etc. and be generated due to valve reliably account for cylinder inspiratory capacity
In operation.
In addition, other modes according to the present invention, discharge coefficient is using the rotation speed of internal combustion engine and valve opening as ginseng
Several functions or table, in the rotation speed of each internal combustion engine and the level of valve opening with constant current coefficient of discharge, and based on fixed
As a result the function of discharge coefficient or the unit of table are updated, therefore, even if in discharge coefficient due to the rotation speed of internal combustion engine
Or valve opening and in the case where becoming different values, the variation of discharge coefficient that can will be also stained etc. and be generated due to valve is reliable
Ground is in view of in the operation of cylinder inspiratory capacity.
In addition, other modes according to the present invention, make gas flow transducer characteristic value time constant, it therefore, can be by gas
The operating lag of flow sensor reliably accounts in the operation of cylinder inspiratory capacity.
In addition, other modes according to the present invention, time constant is using flow as the function of parameter or table, every
A flow is with constant current coefficient of discharge, and the unit based on the same function for determining result renewal time constant or table, therefore, even if
Time constant can also reliably account for the operating lag of gas flow transducer due to flow and in the case where becoming different values
Into the operation of cylinder inspiratory capacity.
In addition, other modes according to the present invention, by throttle valve or the flow of negative pressure valve pulsation rate (relative to
The ratio of the flow amplitude of average flow rate) to stop the modified unit under the operating condition of specified value internal combustion engine below,
Therefore, the mistake amendment under the operating condition that can suitably prevent gas flow transducer detection accuracy from reducing.
In addition, other modes according to the present invention, differential pressure is that specified value is below before and after throttle valve or negative pressure valve
Under the operating condition of internal combustion engine, stop the modified unit, therefore, can suitably prevent gas flow transducer detection accuracy from dropping
Mistake amendment under low operating condition.
In addition, other modes according to the present invention, are in specified value is below in the valve opening of throttle valve or negative pressure valve
Under the operating condition of combustion engine, stop the modified unit, therefore, can suitably prevent the reduction of gas flow transducer detection accuracy
Operating condition under mistake amendment.
In addition, other modes according to the present invention, the modified method is the minimum for minimizing the quadratic sum of error
Square law, the specified value be within ± 2%, and therefore, the variation of discharge coefficient that can will be stained etc. and be generated due to valve is reliable
Ground is considered in the operation of cylinder inspiratory capacity, and the operating lag of gas flow transducer can be reliably accounted for cylinder air-breathing
In the operation of amount.
In addition, other modes according to the present invention, the modified method is will to miss the minimum of absolute value of the difference minimum
Square law, the specified value be within ± 2%, and therefore, the variation of discharge coefficient that can will be stained etc. and be generated due to valve is reliable
Ground is considered in the operation of cylinder inspiratory capacity, and the operating lag of gas flow transducer can be reliably accounted for cylinder air-breathing
In the operation of amount.
The explanation of symbol
1 internal combustion engine
2 gas flow transducers and suction temperature sensor
3 throttle valves
4 induction mnifolds
5 inspiratory pressure sensors
Valve is strengthened in 6 flowings
7 fuel injection valves
8 air-breathing variable valve mechanisms
9 air-breathing variable valve position sensors
10 exhaust variable valve systems
11 exhaust variable valve position sensors
12 spark plugs
13 detonation sensor
14 crank angle sensors
15 air-fuel ratio sensors
16 exhaust emission control catalysts
17 lambda sensors
18 EGR pipes
19 EGR cool down equipment
20 EGR valve upstream temperature sensors
21 EGR valve upstream pressure sensors
22 EGR valves
23 ECU(Electronic Control Unit)
24 pressurized turbo machines
25 compressors
26 turbines
27 negative pressure valves
28 B/P EGR Back Pressure Transducer EGRs
Claims (17)
1. a kind of control device of internal combustion engine, which is characterized in that
It is to have gas flow transducer in the upstream of throttle valve and have the internal combustion of pressure sensor in the downstream of the throttle valve
The control device of machine,
The control device has:
Arithmetic element, based on the pressure sensor come throttle valve described in operation by flow, based on the section after the operation
Valve is flowed by flow come the pressure in throttle valve downstream described in operation, based on the throttle downstream pressure after the operation, operation gas
Cylinder inspiratory capacity；And
Amending unit is corrected by flow based on the throttle valve detected by the gas flow transducer based on the pressure sensor
The throttle valve of operation passes through flow,
The modified unit amendment throttle characteristics value and gas flow transducer characteristic value, so that being based on the pressure sensing
The throttle valve of device presumption is specified value by the difference that flow passes through flow with the throttle valve based on gas flow transducer detection
Hereinafter,
Make the throttle characteristics value discharge coefficient, makes the gas flow transducer characteristic value time constant.
2. the control device of internal combustion engine as described in claim 1, which is characterized in that
Have based on the cylinder inspiratory capacity of the unitary operation of cylinder inspiratory capacity described in operation and controls fuel injection amount and igniting
The unit at moment.
3. the control device of internal combustion engine as described in claim 1, which is characterized in that
The discharge coefficient is that have using the rotation speed of internal combustion engine and valve opening as the function of parameter or table each
The rotation speed of internal combustion engine and the level of valve opening determine the result update discharge coefficient with the fixed discharge coefficient, and based on same
Function or table unit.
4. the control device of internal combustion engine as described in claim 1, which is characterized in that
The time constant is that have in each flow using flow as the function of parameter or table with the fixed flow system
Number, and based on the same unit determined result and update the function or table of the time constant.
5. the control device of internal combustion engine as described in claim 1, which is characterized in that
Have under the operating condition for being specified value internal combustion engine below by the pulsation rate of the flow of the throttle valve, stops institute
State modified unit, wherein pulsation rate is ratio of the flow amplitude relative to average flow rate.
6. the control device of internal combustion engine as described in claim 1, which is characterized in that
Have under the operating condition that the differential pressure before and after the throttle valve is specified value internal combustion engine below, stops described modified
Unit.
7. the control device of internal combustion engine as described in claim 1, which is characterized in that
Have under the operating condition that the valve opening in the throttle valve is specified value internal combustion engine below, stops the modified list
Member.
8. the control device of internal combustion engine as described in claim 1, which is characterized in that
The modified method is the least square method for minimizing the quadratic sum of error, and the specified value is within ± 2%.
9. the control device of internal combustion engine as described in claim 1, which is characterized in that
The modified method is will to miss the least square method of absolute value of the difference minimum, and the specified value is within ± 2%.
10. a kind of control device of internal combustion engine, which is characterized in that
It is to have that energy possessed by the gas being discharged from inflator is converted to power by turbine and is sucked by compressor compresses
The turbocharger of air, and have and a part of exhaust is recycled to the upper of the compressor in the downstream of the turbine
The EGR controller for swimming and controlling exhaust gas recirculation quantity has negative pressure in the upstream of the recirculation position of exhaust
Valve has the control device of the internal combustion engine of B/P EGR Back Pressure Transducer EGR in the downstream of the negative pressure valve,
The control device has based on the B/P EGR Back Pressure Transducer EGR come negative pressure valve described in operation by flow and based on by air-flow
The negative pressure valve of sensor detection corrects unit of the negative pressure valve based on the B/P EGR Back Pressure Transducer EGR operation by flow by flow,
The modified unit amendment negative pressure valve discharge characteristic value and gas flow transducer characteristic value, so that being sensed based on the negative pressure
The negative pressure valve of device presumption is specified value by the difference that flow passes through flow with the negative pressure valve based on gas flow transducer detection
Hereinafter,
Make the negative pressure valve discharge characteristic value discharge coefficient, makes the gas flow transducer characteristic value time constant.
11. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
The discharge coefficient is that have using the rotation speed of internal combustion engine and valve opening as the function of parameter or table each
The rotation speed of internal combustion engine and the level of valve opening determine the result update discharge coefficient with the fixed discharge coefficient, and based on same
Function or table unit.
12. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
The time constant is that have in each flow using flow as the function of parameter or table with the fixed flow system
Number, and based on the same unit determined result and update the function or table of the time constant.
13. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
Have under the operating condition for being specified value internal combustion engine below by the pulsation rate of the flow of the negative pressure valve, stops institute
State modified unit, wherein pulsation rate is ratio of the flow amplitude relative to average flow rate.
14. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
Have under the operating condition that the differential pressure before and after the negative pressure valve is specified value internal combustion engine below, stops described modified
Unit.
15. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
Have under the operating condition that the valve opening in the negative pressure valve is specified value internal combustion engine below, stops the modified list
Member.
16. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
The modified method is the least square method for minimizing the quadratic sum of error, and the specified value is within ± 2%.
17. the control device of internal combustion engine as claimed in claim 10, which is characterized in that
The modified method is will to miss the least square method of absolute value of the difference minimum, and the specified value is within ± 2%.
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| DE102015224078A1 (en) * | 2015-12-02 | 2017-06-08 | Robert Bosch Gmbh | Method and device for determining a fresh air mass flow in an engine system with an internal combustion engine |
| SE1850912A1 (en) * | 2016-01-20 | 2018-07-17 | Walbro Llc | Engine self-adjustment system |
| CN107288771A (en) * | 2016-03-30 | 2017-10-24 | 联合汽车电子有限公司 | Oil injection control system for engine and method |
| US11480126B2 (en) * | 2016-10-19 | 2022-10-25 | Hitachi Astemo, Ltd. | Flow-volume detecting apparatus utilizing filter selection |
| JP6691498B2 (en) * | 2017-03-17 | 2020-04-28 | 本田技研工業株式会社 | Control device for internal combustion engine |
| CN112360638B (en) * | 2020-11-10 | 2022-02-18 | 东风汽车集团有限公司 | Estimation method and system for fresh air flow entering cylinder |
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| JPS5830422A (en) * | 1981-08-13 | 1983-02-22 | Mitsubishi Electric Corp | Fuel injection device for internal combustion engine |
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| JP4297015B2 (en) * | 2004-04-27 | 2009-07-15 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| JP4734312B2 (en) * | 2007-12-05 | 2011-07-27 | 本田技研工業株式会社 | Control device for internal combustion engine |
| JP5133332B2 (en) * | 2009-12-15 | 2013-01-30 | 日立オートモティブシステムズ株式会社 | Control device for internal combustion engine |
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2014
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