CN1133628A - Control of fuelling rate of an engine - Google Patents

Control of fuelling rate of an engine Download PDF

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Publication number
CN1133628A
CN1133628A CN94193850A CN94193850A CN1133628A CN 1133628 A CN1133628 A CN 1133628A CN 94193850 A CN94193850 A CN 94193850A CN 94193850 A CN94193850 A CN 94193850A CN 1133628 A CN1133628 A CN 1133628A
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China
Prior art keywords
mentioned
motor
fuel
filter constants
engine
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Granted
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CN94193850A
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Chinese (zh)
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CN1055521C (en
Inventor
戴威·R·沃思
里查德·W·赫尔利
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Orbital Engine Co Pty Ltd
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Orbital Engine Co Pty Ltd
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Publication of CN1133628A publication Critical patent/CN1133628A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/045—Detection of accelerating or decelerating state
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/04—Two-stroke combustion engines with electronic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
    • F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
    • F02D41/3023—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

A method used for controlling the fuel charge of an engine includes detecting the change rate with time of the fuel amount needed by each circulation according to the demand change of the engine load; adding a filter constant to the change rate so as to maintain the change rate value with time of the fuel amount needed by each circulation of the engine to be equal to or less than a scheduled threshold. The invention also relates to an engine fuel control system carrying out control according to the demand change of the engine load. The engine fuel control system includes a control device for a device detecting the demand change of the engine load, a device detecting the change rate with time of the fuel amount needed by each circulation according to the demand change of the load and a device for detecting the filter constant.

Description

The controlling method of motor volume read-out
The present invention relates to the controlling method of oil-filling type internal-combustion engine volume read-out, specifically relate to a kind of controlling method of volume read-out of the internal-combustion engine that can change torque demand (for example situation when automobile or other vehicle driving) suddenly.
The situation that engine speed increases or reduces fast may appear when driving maneuver vehicle in other words.This may be because driver's requirement or the control result of issuable engine control system during automaitc shfit for example.Thereby the fuel demand amount that may make motor when vehicle acceleration or deceleration increases or reduces to cause motor to add shortage of oil or excessive in several cycles.This shortage of oil or the excessive phenomenon of adding can make the optimum performance of motor descend.
And, owing to separate by quite submissive isolation mount (being commonly referred to entablature) usually between motor and the vehicle support structure, therefore, when the abundant flexibility of frame reduces, quicken or slow down (particularly quicken suddenly or slow down) may cause motor owing to the reaction of its moment of torsion with respect to bigger moving between vehicle chassis, and generally all cause impact entablature.It seems from driver and/or passenger's travelling comfort with to the viewpoint of the stress (this stress preferably should be avoided) of entablature, is undesirable to this big vibration and the impact of entablature.This phenomenon is called " rocking " or " waving " usually.
When motor, gearbox and the last driving mechanism of vehicle was supported on the common frame (for example common front-wheel drive structure), this rocking/wave phenomenon was even more serious usually.When the engine/gearbox assembly is installed on the common frame, the reaction force of the moment of torsion that frame is suffered comprises the moment of torsion that acts on the output shaft of gear-box, and, when above-mentioned engine/gearbox assembly is installed by common frame, act on moment of torsion on the output shaft of gear-box and generally can reach 3～4 times of the moment of torsion that acts on the engine flywheel.
And for the motor that can react fast to driver's requirement, this rocking/wave phenomenon is generally more obvious.For example, the direct oil-filling type two-cycle engine of stratified charge air pressing aid of applicant requires the quick change reaction of (for example requirement of Jia Shiing) responsive especially to load.These motors and common even air inlet motor difference are that it is to control the volume read-out of motor and control the air-flow that enters motor unlike common engine with driver's requirement.Therefore, with the relevant built-in inertia of motor of control air-flow and other retardation phenomenon the motor of applicant is not had identical influence basically.Therefore, may wish to weaken this response characteristic in some cases, then allow the driver to make full use of the rapid response performance of motor in other cases.
No matter what the mode of operation of motor is, above-mentioned problem is when motor and vehicle low cruise, and is general especially when for example driving a vehicle in the city, at this moment, the change that engine load requires usually is unexpected and the endurance weak point, and general getting back to again under the low speed worked at once.Particularly in this case, the oiling of motor error may cause undesired consequences.On the contrary; if the load demand of flip-flop motor under high speed operation; adverse influence usually can be littler, makes any oiling error influence obtain correcting in the time of many work cycle of motor because the high speed operation state usually can keep the long time.
The object of the present invention is to provide a kind of method of under above-mentioned condition, controlling the amount of fuel that adds motor, and above-mentioned problem can be solved or significantly minimizing.
From this purpose, the method for motor volume read-out is controlled in the variation that the invention provides a kind of load demand according to motor, and this method comprises according to the variation of engine load demand measures the required amount of fuel of each circulation rate over time; Then to the required amount of fuel of each circulation measured over time rate add the required amount of fuel of each circulation of motor of maintenance said determination of a filter constants over time the rate value be not more than predetermined threshold value.
This method can be implemented in fuel oil base control system easily, in this system, the operator does not directly control the amount of fuel that adds motor, but only sends a signal (" demand " signal) of representing operator's demand (for example increasing or reduce the power output of motor).By electric control device (ECU) this desired signal is handled required fuel oil and the throughput of decision motor then.Therefore, " demand " signal of operator (can measure as the function of accelerator pedal position easily) is imported among the ECU, and ECU then exports the oiling action that the required fuel oil of each circulation of motor requires signal and correspondingly controls motor.Each above-mentioned circuit volume read-out rate over time can be measured according to method of the present invention, carry out filtering then, filter constants just taking advantage of in case make each circuit volume read-out over time rate be reduced to be not more than a predetermined threshold value (when reaching this threshold value the mobile degree of motor just can make general driver in other words the operator feel uncomfortable and/or life-span of entablature exerted an adverse impact).This threshold value can be the time variable and can from mechanical property for example entablature life-span in other words durability or other factors statistics determine, consider in other words these mechanical properties.
ECU can be designed to easily can be independently, and (irrelevant with driver's action) changes the load demand of motor, this for example automatic transmission case change gear than the time need.In this way, the present invention also can be used for the variation of the load demand that non-driver sends.
Required filter constants or damping constant can be deposited into very easily and be loaded with under specific engine speed and load-up condition each circuit volume read-out over time in the tracing table of the particular preset value of rate.In this method, ECU provides the suitable filters constant according to the working state of motor.And, store the tracing table of this filter constants or damping constant or need can make according to the vehicle driving speed of detection easily middle the tracing table that this filter constants tracing table produces input signal.The vehicle driving speed that detects itself depends on other engine operating parameter, as engine speed and load, also can calculate running speed from these running parameters if desired.The method of calculating the specific shelves number of vehicle from the running speed of engine speed and vehicle is known, therefore, and as relevant with the running speed of vehicle.It is relevant that tracing table also can be made into the shelves number of hanging with vehicle.
Reservoir needs the tracing table of filter constants or damping constant can be designed to the variation of the time that is adapted to easily.Therefore, if selected concrete filter constants can produce for example unsatisfied engine behavior, then can repeatedly filter constants be added on each circuit fuel demand amount of required motor, make filter constants increment up or down one by one, when trying to achieve suitable numerical value, can replace originally depositing in the filter constants in the tracing table.
In like manner, the required amount of fuel of being measured of each circulation rate over time can be the variable of constant (volume read-out is the linear function of time) or time.If the variable of time, ECU can calculate and represent each circuit volume read-out of motor function of the change situation of rate over time.
Moment finishes easily for the filtering of the rate of change of the motor volume read-out that driver or ECU are required or damping.This is for fuel oil base control system advantageous particularly, and as mentioned above, the inertia of this control system and hysteresis are general littler than the common even air intake control system of air base.In other words, the special bosom of filtering fast and damping must be arranged in fuel oil base control system, so that obtain the smooth change of volume read-out and/or make each circuit oiling rate of change value of motor change to the ideal effect that is not more than predetermined threshold value.
But rate is the same over time with each required amount of fuel that circulates of being measured, and the filtering degree can be to consider the variable of the time of some characteristic (for example performance of entablature).Obviously, motor is rocking/is waving beginning and the time moving apparent in viewly, and at this moment, entablature generally is in flexibility stage preferably.Along with the quickening of engine rotation, the flexibility of frame generally descends.Therefore, the lance that can the consider frame condition of showing respect for what others feel changes the filtering degree, and can begin to calculate its filter constants, guarantee frame be in flexibility preferably during the stage oiling rate of change of motor less.After this, can recomputate filter constants with increase to refuel rate of change and make its can be apace near each required circulation amount of fuel rate over time because the entablature rigidity increase flexibility in other words reduce can remedy may occur rock/wave degree.The calculating again of this filter constants can be carried out or more gently carry out step by step.
Method of the present invention can be easily with the pending application application AU 34862/93 of applicant and PCT/AU 94/0036 in disclosed method Joint Implementation, the content of these two patents is included into this patent as a reference.
On the other hand, the invention provides a kind of device of implementing said method, be a kind of engine fuel control of controlling according to the variation of engine load demand specifically, this system comprises a control gear that has the device of the variation of measuring the engine load demand; Each required amount of fuel device of rate over time that circulates of motor is measured in variation according to the above-mentioned engine load demand of measuring; And measure each the required amount of fuel that circulates of motor to be added to said determination and equal a device of the filter constants of the numerical value of filtering so that this variance ratio adjusted on the rate over time, the numerical value of described filtering equals each required amount of fuel rate over time that circulates that filter constants multiply by mensuration, and this value is not more than predetermined threshold value.
The device of measuring filter constants can provide a suitable filters constant according to detected engine behavior.For example can according to the running speed of the vehicle of detected engine speed, engine load and this motor of installation and or the variation of vehicle shelves number measure filter constants.In this method, filter constants be one can influence engine operation from but the function of parameter of " steerability " of the vehicle of this motor is installed in influence, and can correct preferably any rocking/behavior of waving of motor.
Though filter constants can be measured according to above-mentioned parameter, it also can be measured according to other detected engine operating parameter.For example, in the time need proofreading and correct specific engine air/fuel oil than demand with filter constants, then charge flow rate and fuel flow transducer can be included the part of this system as the device of measuring filter constants in.The device of measuring filter constants constitutes the part of control gear (normally electric control device), and is the critical component of this device.Control gear and the required sensor that can design reasonably programming are installed on vehicle or other motor.
From below in conjunction with the description of the drawings, can have more clearly the present invention and understand, in the accompanying drawing,
Fig. 1 is the sketch of the engine control system of first embodiment of the invention;
Fig. 2 is the sketch of the engine control system of second embodiment of the invention;
Fig. 3 is the sketch of the engine control system of prior art; With
Fig. 4 is the sketch according to the engine control system of including " control of fuel oil base " system in of the third embodiment of the present invention.
Referring to Fig. 1, the method for work according to the engine control system of the oiling of the method for the invention described above control vehicle motor has been described roughly among the figure.Part shown in the dotted line is the electric control device (ECU) 9 of a critical component of formation engine control system among the figure, and this engine control system by ECU control itself is that prior art is known.ECU9 receives from the signal of the indication engine speed of engine speed sensor 10 and from the signal of the indication engine load demand of load demand sensor 11, and the latter is generally represented by the potentiometric position that is fixed on the driver-operated throttle pedal.These two kinds of input signals preferably carry out filtering to remove interference, to avoid vibration.Be to be further noted that ECU9 can be used for changing independently the engine load demand by the control of pilot control throttle pedal, therefore, load demand sensor 11 can be designed to a sensor that detects the signal that the non-person of driving sends.
ECU9 can measure the rotating speed of motor and engine load demand rate over time by above-mentioned signal.And as mentioned above, if necessary, ECU9 can be used to receive the signal from the indication vehicle driving speed of suitable running speed sensor, in other words, in fact is to produce sort signal by engine operating parameter other sensings or input.In other words (in other words, in addition), the signal of the shelves number that the indication motor is hung can be input among the ECU9." engage a gear signal " can indicate whether that the actual demand of connecting filter circuit is arranged.The same with vehicle driving speed, the engage a gear signal can be used as engine operating parameter, and (for example the function calculation of the speed of a motor vehicle and engine speed is come out.Like this, draw analogous conclusions, for example as if under the state of low-grade number and low engine speed, the filtering of the rate of change of volume read-out (being dFPC/dt) is necessary more.
Must see, preferably use running speed as be input among the ECU9 variable or as the variable that sends by ECU9, less to the influence of the method for work of engine control system like this.That is to say that identical for the volume read-out possibility of the different running speed of many kinds owing to the difference according to vehicle institute engage a gear number, therefore, according to the difference of running speed, the filtering of motor volume read-out rate of change may go too far or is not enough.For example, the load demand that increases motor under the low speed of a motor vehicle and the low engine speed suddenly load demand that reduces motor subsequently again suddenly generally all can produce undesirable rocking/wave situation.This situation generally is for example when the steering vehicle of car park, quicken in short-term under low grade.Therefore, wish very much in this case to avoid above-mentioned rocking/wave situation to what the volume read-out rate of change carried out a large amount of filtering.
On the contrary, under the situation of high running speed and low engine speed, for example under quite high speed during cruising, may not wish also not require and carry out a large amount of filtering, because because other factors such as vehicle inertia for example, in fact the rocking of the motor/behavior of waving may be unworthy causing driver's attention.Other contingent situation is a steering vehicle bravely under high engine speed.In this case, may not wish the rate of change of motor volume read-out is carried out filtering,, be reduced to the unsatisfied stage of driver because do the performance that may make motor like this.
A bit it should be noted that in addition and usually when gear shift, do not wish to carry out a large amount of filtering, and, do not wish to carry out filtering in some cases during gear shift.For example, when normal gear shift, the driver of vehicle presses clutch switch when unclamping the accelerator pedal of oiling, engine speed is reduced, up to selected another velocity ratio and make throw-out-of clutch, simultaneously provide the load requirement till.Change the motor volume read-out filter circuit of rate over time if connected when the driver presses clutch switch or unclamps accelerator pedal when gear shift, the ECU of motor can detect contingent vibrating state, thereby the filtering situation of volume read-out rate of change is shown.If rock rather than the speed of motor reduces, should keep the speed of motor.In fact, the speed of motor may increase owing to gearbox is unloaded.The driver can attempt to proofread and correct by gear shift the work variation of above-mentioned motor.Anyly cause the unnecessary increase of volume read-out and the way of fuel consumption all is undesirable.
Therefore, whether filter circuit connects best signal according to clutch switch is decided, and like this, just can not have the situation of filtering or filtering degree deficiency when the driver carries out gear shift.Obviously, if do not receive the signal of clutch, ECU then handles other various variations, and the issuable situation of rocking or waving situation and correspondingly connecting filter circuit is shown.Should be clear, when beginning gear shift or finishing gear shift, no matter whether receive clutch engagement signal, the situation of similarly proofreading and correct is available equally.
Below again referring to Fig. 1, according to engine speed 10 and by the driver's of pedal potentiometer position n representative demand engine load demand in other words, each circuit fuel oil (FPC) demand tracing table (searching figure in other words) 12 produces the signal of representative motor 20 each circuit volume read-out demand (FPC demand) 13.From FPC demand Figure 12, ECU9 also can calculate each circuit fuel demand amount of motor rate (dFPC/dt) 14 over time.This value can be calculated by the reading of two FPC demands under the predetermined time interval easily, and the time lag herein is meant the time between twice FPC requirements of record.Described these two FPC requirements can be defined as the FPC of FPC demand and a preceding demand relevant with new pedal position easily.
Represent the signal 13 of motor 20 required volume read-outs (FPC demand) to be input in second tracing table (figure) 15, and calculate the fundamental constants (B) 17 of wave filter from these values with running speed 16.ECU9 calculates running speed signal 16 according to detected (known in other words) engine operating parameter.And then the actual rate (dFPC/dt) of wave filter fundamental constants 17 and volume read-out is input in the 3rd tracing table (figure) 18, if necessary, search Figure 18 and can provide actual filter constants value 19, then, the filter constants 19 that this is actual is added on the initial FPC requirements, has just produced through the FPC value 30 of the decay in other words of filtering and can be used as the Control Parameter of working to be input in the motor 20.This " reality " filter constants value 19 is applicable to specific dFPC/dt value, thereby make volume read-out rate of change with respect to new FPC requirements be reduced to required degree (that is to say, be reduced to be lower than predetermined dFPC/dt threshold value and avoid undesirable the degree of rocking/waving).
The method of this control FPC demand rate of change can not cause motor 20 oiling errors, but also can be provided at the acceleration of permissible degree as requested and the satisfied down volume read-out that slows down.For this reason, look into to have among Figure 18 and turned out to be driver (operator in other words) or the required predetermined filter constants of being satisfied with specific dFPC/dt of ECU calculating seeking of actual filter constants.This has just improved the cornering ability of vehicle, because moving with consequent any impact to entablature of motor 20 all can be controlled to acceptable or even more ideal degree.The filtering of above-mentioned FPC desired signal 13 is recurred simultaneously; Up to quicken or slow down finish till.
In another embodiment, be provided with a device, this device is not considered running speed, and/or only start according to (or compiled program is input among the ECU9) some engine behavior of being calculated by ECU9.This device is shown in Fig. 2.Its work can be regarded as simply with the same but running speed is not proofreaied and correct referring to the explanation that Fig. 1 did.In this device, do not establish second and search Figure 15.In this case, only need just can (find the fundamental constants 24 of wave filter among Figure 23 at tracing table with volume read-out rate of change (dFPC/dt) 14 and fuel demand amount 13.Then, the fundamental constants of wave filter is added on initial fuel demand amount or the required FPC13, just draw through filtering in other words through the FPC value 30 of decay, this numerical value can be used as the Control Parameter of working and is input in the motor 20.
In the applicant's unsettled Australian patent application NO.AU 34862/93, set forth the air that enters in a kind of control cylinder circulation each time in the internal-combustion engine and the method for amount of fuel.Control system is as shown in Figure 3 disclosed in this patent.Referring to Fig. 3 (it is similar to the Fig. 3 in the above-mentioned equating patent application), when motor 20 proper functioning, the FPC demand searches this signal 13 that Figure 12 produces a representative motor 20 each circuit fuel demand amount.Represent this signal 13 of motor 20 each circuit fuel demand amount to be imported among decision air requirements Figure 23 with respect to each circuit air requirements amount 27 of the specific fuel demand amount 13 of each circuit (relevant) with the rotating speed of motor.Detect the amount of actual air for combustion that under the position at that time of throttle valve 28 and bypass valve 29, enters in each circulation in the motor 20 by air inflow sensor 22 then.If the amount of actual air for combustion 21 that enters in the motor 20 in each the circuit air requirements amount 27 that is searched Figure 23 indication by the air requirements amount and each circulation is not corresponding, the then correction of carrying out necessity of starting of bypass valve 29.This move is generally by proportional plus integral plus derivative controller (PID) 31 controls.
The signal of each circuit fuel demand amount 13 and the actual air inflow 21 of each circuit also all is input to air/fuel than in the comparator 25, in comparator 25, to the air/fuel that draws by these input signals than comparing with air/fuel ratio according to the predetermined authorization of engine load demand or pedal position and engine speed.These air/fuel of authorizing ratios are stored in and search among the figure, and its value is generally between maximum and minimum predetermined limit value.Required air/fuel than the air/fuel that can not surpass authorization than limiting value, so, for example can not surpass the non-ignitable limit of motor rich oil.If by the air/fuel of actual air inflow 21 decisions of each circuit fuel demand amount 13 and each circuit than and the air/fuel of authorization than between difference greater than admissible value, then proofreading and correct module 26 connects, the every circuit volume read-out that enters in the motor 20 is proofreaied and correct, make air/fuel than and the authorization air/fuel than between difference be in allowed band.
Therefore, in design of the present invention, for example under the situation of flip-flop pedal position under the low running speed, the rate of change of each circuit fuel demand amount (dFPC/dt authorization) of authorization is input to provides the basic filter constant of the basic filter constant 17 that is suitable for specific dFPC/dt authorization value to search among Figure 15, so just volume read-out rate of change dFPC/dt 14 can be reduced to top in conjunction with in the described control range of Fig. 1.This situation as shown in Figure 4.But this system also can be changed into: even each circuit volume read-out rate of change dFPC/dt 14 surpasses a certain threshold value under high running speed, filter circuit still can be connected.In view of the above, can believe that the purpose of filter circuit is to make the driver more comfortable, and the structure of whole system all is in order to reach this purpose.
The value of filter constants can time to time change, water the selected filter constants 19,24 that the chamber pressure sensor goes out by for example combustion if for example several times filter constants 19,24 is added on the specific FPC demand at every turn and cause that all motor 20 rich oils are missing of ignition, then filter constants 19,24 can be on request decrement downwards, and replace originally depositing in filter constants among filter constants Figure 18,23.Thereby the filtering that keeps required in this way keeps the fueling state of motor 20.
In addition, filter constants 19,24 or filter constants Figure 18,23 can change with the variation or the difference of entablature.For example, As time goes on, the wearing and tearing of entablature or timeliness aggravation are because this deterioration of entablature must correspondingly change the filtering to each circuit fuel oil rate of change (dFPC/dt) 14.Can consider these factors in the program of ECU9.And ECU9 can be designed so that it can adapt to filter constants Figure 18,23 of different entablatures (when for example changing the vehicle motor frame).For this reason, ECU9 can receive from the crankshaft vibration signal of sensing in other words of the accelerometer on the appropriate location, perhaps sends sort signal.
Set forth a kind of system above, in this system, described method for example is applicable to the filter change by the volume read-out rate of change of ECU9 (irrelevant with driver's action) decision.For the application facet at the automatic transmission case motor, ECU9 can reduce the load demand apace, and then instruction increase load demand, but just smooth transition when gear shift like this.Volume read-out when therefore, this method can be used to the motor backhaul controls to the high loading demand and don't need carry out filtering the volume read-out when reducing motor 20 gear shift.
The following describes another embodiment, in this embodiment, filter constants is the function of time, and the mobile entablature changes of properties that causes of the motor that the change of engine load demand causes is considered in the change of filtering degree.
Usually, but the entablature impact of adaptation on it originally vibrate in other words, subsequently, owing to frame be subjected to the external force of engine action on it become more do not have elasticity, the more vibration of incompatibility motor in other words.Therefore, consider this phenomenon, can change each circuit volume read-out filtering degree of rate over time.This point can realize with following method.
At first, when the change owing to the engine load demand shakes or waves, must at first carry out the rate of change that a large amount of filtering reduces volume read-out in other words, control the initial mobile influence of motor in other words with restriction to its frame, no matter problem is above-mentioned frame the influence of whether being rocked or waving, always it will be subjected to the external force that the rotation owing to motor produces.
This method can prevent that motor is subjected to too big momentum and by its frame the impact that is produced is made a concerted effort to pass to vehicle.Like this, when frame began to bear because of making a concerted effort (in other words that engine rotation produces, it is incompatible that frame begins to become) time, can allow motor that bigger volume read-out rate of change is arranged because motor moving originally, be in general bigger move controlled.Subsequently, after finishing in initial " adaptation " stage, entablature has born the major part that this rotation produced of motor and has made a concerted effort.Therefore, thereby can recomputate filter constants and reduce the filtering degree and can not increase the volume read-out rate of change therefrom and entablature is produced huge impact vibrate in other words, can make the mobile degree of motor can not influence driver's travelling comfort because the rigidity of frame has been increased to.
Recomputate filter constants and change the filtering degree can according to the mobile degree of motor progressively (in other words gradually) carry out, the mobile degree of motor then depends on the time or to the testing result of entablature rigidity.This variation of filtering aspect can make performance curve better, because filtered volume read-out rate of change can be more near driver's requirement, perhaps can be with filtering have obtained will to obtain the last required essentially identical speed of FPC under the condition of required volume read-out rate of change or the time draws last required FPC not carrying out.
In a kind of implementation methods, a fueling signal counter or a time counter have been adopted, just can for example allow the driver to increase volume read-out suddenly, just under low engine speed, become big throttle opening (this situation always makes the situation of rocking reach unallowed degree usually) from slow train speed.At this moment, ECU9 can provide a kind of filter constants that can obtain to produce lower volume read-out rate of change at the fueling signal counter connection initial stage.This filter constants can be come out according to engine speed, shelves number and running speed or other above-mentioned calculation of parameter, the initial volume read-out rate of change of motor is remained on can cause below the threshold value that excessive engine moves.
Like this, when the frame of motor becomes rigidity flexibility is low more in other words, volume read-out can increase and the excessive situation of movement of motor relaxes to some extent, therefore, can change the filter constants value, the volume read-out rate of change can stably be risen and approaching fast last required value along with counter-increments.
When reaching last each required circuit volume read-out over time during speed, can be with the counter set to zero, and it is turned off, till occurring rocking next time/wave.
Above to explanation of the present invention and unrestricted the present invention's meaning, the personnel that present technique is familiar with can put the change of the present invention being carried out other before not departing from the scope of the present invention.

Claims (35)

1. the method for motor volume read-out is controlled in the variation according to the engine load demand, and this method comprises according to the change of above-mentioned engine load demand measures each required amount of fuel rate over time that circulates; Then to the required amount of fuel of each circulation of said determination over time rate add a filter constants with keep the required amount of fuel of each circulation of motor over time the rate value be not more than predetermined threshold value.
2. according to the method for claim 1, it is characterized in that, above-mentioned filter constants is provided by the tracing table in the control gear, and above-mentioned tracing table has corresponding to required rate, preset the over time filter constants value of amount of fuel of each circulation specific under the specific engine behavior.
3. according to the method for claim 1 or 2, it is characterized in that the working state of motor is depended in the application of above-mentioned filter constants.
4. according to each method in the claim 1～3, it is characterized in that at least one parameter in following one group of parameter depended in the application of above-mentioned filter constants: motor shelves number, clutch position, running speed, engine load and motor pass speed.
5. according to each method in the claim 1～4, it is characterized in that above-mentioned filter constants value depends on engine load and/or engine speed.
6. according to each method in the claim 1～5, it is characterized in that above-mentioned filter constants value depends on detected vehicle driving speed.
7. according to each method in the claim 1～6, it is characterized in that above-mentioned filter constants value depends on the signal that is sent when changing the motor shelves counts.
8. according to each method in the claim 1～7, it is characterized in that, above-mentioned filter constants can be in time and adaptively increment and draw a filter constants that accords with given engine behavior up or down.
9. according to each method in the claim 1～8, it is characterized in that above-mentioned filter constants can be proofreaied and correct according to the variation of entablature wearing and tearing.
10. according to each method in 2～9 in the claim, it is characterized in that, above-mentioned control gear is according to the required air/fuel ratio of working state decision of motor, and be lower than above-mentioned predetermined threshold value than each the above-mentioned circuit volume read-out rate of change of maintenance that changes above-mentioned filter constants according to this air/fuel, keep required air/fuelization simultaneously again.
11., it is characterized in that the variation of above-mentioned engine load demand is by operator's control of motor according to each method in the claim 1～10.
12., it is characterized in that the variation of above-mentioned engine load demand and operator's action are irrelevant according to each method in the claim 1～10.
13. the method according to claim 11 is characterized in that, the position of throttle valve pedal is depended in the variation of above-mentioned engine load demand.
14., it is characterized in that the working state of motor is depended in the variation of above-mentioned engine load demand according to each method in the claim 1～13.
15., it is characterized in that each that above-mentioned filter constants is added to mensuration required volume read-out instantaneous finishing on the rate over time of circulating according to each method in the claim 1～14.
16., it is characterized in that above-mentioned filter constants value changes with the variation of the flexibility of above-mentioned entablature according to each method in the claim 1～15.
17. method according to claim 16, it is characterized in that, when adding that above-mentioned filter constants and above-mentioned motor begin when its frame moves, just immediately above-mentioned filter constants is calculated and produced each circuit volume read-out of a motor initial threshold value of rate over time, when diminishing with the reduction of above-mentioned entablature flexibility, the amount of movement of above-mentioned motor recomputates above-mentioned filter constants, make each circuit volume read-out of this motor of calculating subsequently over time rate greater than above-mentioned initial value, thereby can approach each circuit volume read-out of the required motor of above-mentioned power operation person quickly.
18., it is characterized in that the required amount of fuel of each above-mentioned circulation rate is over time directly determined by above-mentioned engine load demand according to each method in the claim 1～17.
19., it is characterized in that above-mentioned method realizes in fuel oil base control system according to each method in the claim 1～18.
20. according to each method in the claim 1～19, it is characterized in that, when each required amount of fuel that circulates of motor of said determination just adds above-mentioned filter constants when rate surpasses predetermined threshold value over time.
21., it is characterized in that the required amount of fuel of each circulation of said determination rate over time is the variable of time according to each method in the claim 1～20.
22., it is characterized in that the required amount of fuel of each circulation of said determination rate over time is constant according to each method in the claim 1～20.
23., it is characterized in that above-mentioned predetermined threshold value is the variable of time according to each method in the claim 1～22.
24., it is characterized in that above-mentioned motor is a kind of direct-lighting type motor according to each method in the claim 1～23.
25., it is characterized in that above-mentioned motor is a kind of air pressing aid motor according to each method in the claim 1～24.
26. an engine fuel control of controlling according to the change of engine load demand comprises a control gear that has the device of the variation that is used for measuring the engine load demand; Each required amount of fuel device of rate over time that circulates of motor is measured in variation according to the engine load demand of said determination; Each required amount of fuel that circulates of motor that mensuration will be added to said determination equals a device of the filter constants of the numerical value of filtering so that this variance ratio adjusted on the rate over time, the numerical value of described filtering equals each required amount of fuel rate over time that circulates that filter constants multiply by mensuration, and this value is not more than predetermined threshold value.
27. the control system according to claim 26 is characterized in that, it contains the sensor of the numerical value of measuring the engine behavior relevant with filter constants, so that according to detected numerical value decision filter constants.
28. the control system according to claim 26 or 27 is characterized in that, above-mentioned sensor comprises engine load sensor and/or engine rotation speed sensor.
29., it is characterized in that above-mentioned sensor comprises the running speed sensor according to each control system in the claim 26～28.
30., it is characterized in that above-mentioned sensor comprises the gear shift sensor according to each control system in the claim 26～29.
31., it is characterized in that above-mentioned sensor comprises the device of measuring the entablature degree of wear according to each control system in the claim 26～30.
32., it is characterized in that above-mentioned sensor comprises inlet stream and fuel flow sensor according to each control system in the claim 26～31.
33., it is characterized in that above-mentioned sensor comprises the sensor that detects clutch position according to each control system in the claim 26～32.
34., it is characterized in that above-mentioned motor is a kind of direct-lighting type motor according to each control system in the claim 26～33.
35., it is characterized in that above-mentioned motor is a kind of air pressing aid motor according to each control system in 26～34 in the claim.
CN94193850A 1993-10-21 1994-10-20 Control of fuelling rate of an engine Expired - Fee Related CN1055521C (en)

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CN105190115B (en) * 2013-04-01 2017-03-22 本田技研工业株式会社 Vehicular power transmission device
CN109611220A (en) * 2018-11-29 2019-04-12 潍柴动力股份有限公司 A kind of accelerator control method and device

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CA2171623A1 (en) 1995-04-27
EP0724686B1 (en) 2001-04-04
EP0724686A1 (en) 1996-08-07
JPH09504068A (en) 1997-04-22
WO1995011377A1 (en) 1995-04-27
EP0724686A4 (en) 1998-05-06
KR100351580B1 (en) 2002-12-26
BR9407872A (en) 1996-10-29
ES2155482T3 (en) 2001-05-16
MY113975A (en) 2002-07-31
CN1055521C (en) 2000-08-16

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