WO2010050061A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- WO2010050061A1 WO2010050061A1 PCT/JP2008/069940 JP2008069940W WO2010050061A1 WO 2010050061 A1 WO2010050061 A1 WO 2010050061A1 JP 2008069940 W JP2008069940 W JP 2008069940W WO 2010050061 A1 WO2010050061 A1 WO 2010050061A1
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- torque
- efficiency
- amount
- air amount
- internal combustion
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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
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
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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
- F02D41/0002—Controlling intake air
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/10—Introducing corrections for particular operating conditions for acceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
- F02P5/1504—Digital data processing using one central computing unit with particular means during a transient phase, e.g. acceleration, deceleration, gear change
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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
- 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
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/21—Control of the engine output torque during a transition between engine operation modes or states
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/22—Control of the engine output torque by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device for an internal combustion engine, and more particularly to a control device for an internal combustion engine capable of controlling torque by operating an intake actuator that adjusts an intake air amount and ignition timing.
- Japanese Patent Application Laid-Open No. 2007-132203 discloses a technique effective for improving the response of torque generated in an internal combustion engine.
- the control response delay amount is the difference between the estimated torque estimated from the target torque control amount and the target torque.
- a torque control amount is calculated from the target torque that is compensated and added with the difference in which the response delay is compensated.
- the control amount that compensates for the response delay of the control can be calculated accurately. Therefore, the response of the torque generated in the internal combustion engine by controlling each device of the internal combustion engine with the control amount. Can be improved.
- this conventional technology has room for improvement in terms of torque controllability.
- the response delay of the estimated torque with respect to the target torque is compensated by increasing the torque control amount, but the increase amount is determined by adaptation using an actual machine. For this reason, when the adaptation is insufficient or the performance of the actual machine varies greatly, an excessive increase in the torque control amount may cause a torque overshoot. If the torque response is not sufficient, the vehicle behavior intended by the driver cannot be realized. Similarly, if the torque controllability is not sufficient, the vehicle behavior intended by the driver cannot be realized. Can not.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a control device for an internal combustion engine that can improve both the response and controllability of torque generated by the internal combustion engine. To do.
- this control device is a control device for an internal combustion engine capable of controlling the torque by operating the intake actuator for adjusting the intake air amount and the ignition timing.
- the control device includes means for setting a required torque for the internal combustion engine and means for setting a required efficiency.
- the efficiency referred to in this application is related to the conversion rate of the energy of the in-cylinder air-fuel mixture into torque, and is expressed as a dimensionless value based on the conversion rate at a predetermined ignition timing setting.
- the control device includes means for calculating a required air amount from the required torque and required efficiency, and means for calculating an operation amount of the intake actuator based on the required air amount.
- the intake actuator includes not only the throttle but also an intake valve whose lift amount or working angle is variable.
- control device includes means for calculating a retard amount of the ignition timing necessary for realizing the required torque.
- the means for calculating the ignition timing retardation amount calculates a torque when the intake actuator is operated with an operation amount calculated based on the required air amount under a predetermined ignition timing setting, and the torque and the required torque The ignition timing retardation amount is calculated based on the deviation from the above.
- the intake actuator operates so as to realize the required air amount determined from the required torque and the required efficiency.
- the required efficiency is set to a value smaller than 1
- the required air amount is increased by the required efficiency, and the intake actuator is greatly operated in the direction of increasing the intake air amount.
- the realizable torque increases.However, the ignition timing is retarded according to the difference between the torque and the required torque, so that the torque deviation is reduced. Compensation is achieved by torque adjustment by the ignition delay angle, and as a result, the required torque is realized in the internal combustion engine.
- the control device further includes means for correcting the required efficiency. Specifically, when the required torque setting value is rapidly increased by the means for setting the required torque, this means temporarily decreases the required efficiency setting value in accordance with the rapid increase of the required torque setting value.
- the sudden increase in the set value of the required torque means that the set value of the required torque is increased by an amount or speed exceeding the range of the torque increase amount or the increase speed that can be realized only by operating the intake actuator. Increasing the set value of the required torque stepwise beyond a predetermined increase amount is included in an example of a sudden increase in the set value of the required torque.
- the timing at which the required torque set value is rapidly increased and the timing at which the required efficiency set value is temporarily reduced are preferably at the same time, but at a timing that does not affect the responsiveness of the intake air amount described later. Deviation is allowed. Therefore, the required efficiency setting value may be temporarily reduced at the timing when the required torque setting value suddenly increases, or the required efficiency setting value may be temporarily reduced when the required torque setting value suddenly increases. May be reduced.
- the ignition timing is retarded so as to suppress the torque overshoot caused by the sudden increase in the intake air amount, the actual torque is prevented from overshooting the required torque. That is, according to the first aspect of the present invention, it is possible to ensure torque controllability while improving the torque response of the internal combustion engine.
- the degree and time for which the required efficiency setting value is temporarily reduced in accordance with the timing at which the required torque setting value is rapidly increased may be constant regardless of the degree to which the required torque setting value is rapidly increased. However, it is more preferable to determine the degree to which the required efficiency setting value is temporarily reduced according to the degree to which the required torque setting value is rapidly increased. It is also more preferable to determine a time for temporarily reducing the required efficiency setting value in accordance with the degree to which the required torque setting value is rapidly increased.
- the retard of the ignition timing which is disadvantageous, can be suppressed. Accordingly, if the degree and time for temporarily reducing the required efficiency setting value are determined according to the degree to which the required torque setting value is rapidly increased, it is possible to achieve a good balance between torque response and fuel consumption. it can.
- this control device is a control device for an internal combustion engine capable of controlling the torque by operating the intake actuator for adjusting the intake air amount and the ignition timing.
- the control device includes a means for obtaining the required torque and the required efficiency, calculating a required air amount from the acquired required torque and the required efficiency, and a means for calculating an operation amount of the intake actuator based on the required air amount.
- the required torque setting method there is no limitation on the required torque setting method and the required efficiency setting method.
- the required torque may be set inside the control device, or the required torque set outside the control device may be received.
- the required efficiency may be set inside the control device, or the required efficiency set outside the control device may be received.
- control device includes means for calculating a retard amount of the ignition timing necessary for realizing the required torque.
- the means for calculating the ignition timing retardation amount calculates a torque when the intake actuator is operated with an operation amount calculated based on the required air amount under a predetermined ignition timing setting, and the torque and the required torque The ignition timing retardation amount is calculated based on the deviation from the above.
- the intake actuator operates so as to realize the required air amount determined from the required torque and the required efficiency.
- the acquired required efficiency is a value smaller than 1
- the required air amount is increased by the required efficiency, and the intake actuator is greatly operated in the direction of increasing the intake air amount.
- the amount of operation of the intake actuator increases, but the ignition timing is retarded according to the difference between the torque and the required torque, so that the torque deviation can be reduced. Compensation is achieved by torque adjustment by the ignition delay angle, and as a result, the required torque is realized in the internal combustion engine.
- the control device further includes means for detecting a sudden increase request for torque and means for correcting the required efficiency.
- the means for correcting the required efficiency is a means for temporarily lowering the value of the required efficiency used for calculating the required air amount when a torque sudden increase request is detected.
- the rapid torque increase request means a torque increase request at a speed exceeding the range of the torque increase speed that can be realized only by operating the intake actuator.
- the rapid increase request of torque can be detected from the change amount or change speed of the required torque. For example, it is possible to detect a torque sudden increase request by determining that there is a torque sudden increase request when the amount of change or speed of change in the required torque exceeds a certain threshold.
- the request for a rapid increase in torque can be detected by receiving the signal.
- the ignition timing is retarded so as to suppress the torque overshoot caused by the sudden increase in the intake air amount, the actual torque is prevented from overshooting the required torque. That is, according to the second aspect of the present invention, it is possible to ensure torque controllability while improving the torque response of the internal combustion engine.
- the degree and time for temporarily reducing the value of the required efficiency used for calculating the required air amount when the torque rapid increase request is detected may be constant regardless of the magnitude of the torque rapid increase request. However, it is more preferable to determine the degree to which the required efficiency value is temporarily reduced according to the magnitude of the torque rapid increase request. It is also more preferable that the time for temporarily reducing the value of the required efficiency is determined according to the magnitude of the torque rapid increase request.
- the degree of temporary increase in the required air volume increases due to the synergistic effect of the rapid increase in required torque and the decrease in required efficiency. According to this, the greater the torque increase request, the greater the overshooting action of the intake actuator and the higher the responsiveness of the amount of air sucked into the cylinder. High torque response can be obtained.
- the request for rapid increase in torque is small, that is, when the overshooting operation of the intake actuator is small, the degree of temporary decrease or decrease in the required efficiency value is reduced, which is disadvantageous in terms of fuel consumption.
- the retard of the ignition timing can be suppressed. Therefore, if the degree and time for temporarily reducing the value of the required efficiency are determined according to the magnitude of the torque rapid increase request, both the torque response and the fuel consumption can be achieved well.
- Embodiment 1 of this invention It is a block diagram which shows the structure of the control apparatus of the internal combustion engine as Embodiment 1 of this invention. It is a figure for demonstrating the setting method of the request
- Embodiment 1 FIG. Embodiment 1 of the present invention will be described with reference to FIGS.
- FIG. 1 is a block diagram showing the configuration of a control device for an internal combustion engine as Embodiment 1 of the present invention.
- the control device of the present embodiment is a control device applied to a spark ignition type internal combustion engine.
- the control device of the present embodiment controls the torque of the internal combustion engine by operating an electronically controlled throttle (hereinafter simply referred to as a throttle) 12 and an ignition device 20 as an intake actuator.
- a throttle electronically controlled throttle
- the control device of the present embodiment includes a required torque setting unit 2 that sets a required torque value for the internal combustion engine.
- the requested torque setting unit 2 considers the torque request for vehicle control such as ECT (Electronic Controlled Transmission) and VSC (Vehicle Stability Control System) as well as the torque request from the driver calculated based on the accelerator operation amount. To set the required torque.
- the control device of the present embodiment includes a required efficiency setting unit 4 that sets a required value of efficiency for the internal combustion engine.
- the efficiency is related to the conversion rate of the energy of the in-cylinder mixture into torque, and is expressed as a dimensionless value based on the conversion rate at a predetermined ignition timing setting (MBT in the present embodiment).
- MBT ignition timing setting
- the required efficiency value is set to a value smaller than the standard value of 1.
- the required efficiency value is set to a value smaller than the standard value 1 in order to secure the reserve torque in advance.
- One important feature of the control device of the present embodiment is the function of the required efficiency setting unit 4. Details of the function will be described later.
- the control device includes a TA required torque calculation unit 6 that calculates a required torque for throttle operation (hereinafter, TA required torque), and a TA required torque.
- TA required torque a required torque for throttle operation
- TA required torque a required torque for throttle operation
- TA required torque a required torque for TA required torque
- TA required torque a required torque for TA required torque
- TA required torque a required torque for TA required torque
- a required air amount calculation unit 8 that calculates the required air amount is provided.
- the required torque and required efficiency are input to the TA required torque calculator 6.
- the TA required torque calculator 6 calculates the TA required torque by dividing the required torque by the required efficiency. In this case, if the required efficiency is a standard value of 1, the TA required torque is not changed from the required torque, but if the required efficiency is less than 1, the TA required torque is raised from the required torque. In other words, the TA required torque calculation unit 6 divides the required torque by the required efficiency to add the torque decrease due to the ignition retard to the required torque for the throttle operation when the ignition retard is required. It has become.
- the required air amount calculation unit 8 converts the TA required torque into an air amount (KL) using the KL map.
- the air amount referred to here is the in-cylinder intake air amount per cycle, and may be replaced with a non-dimensional filling efficiency.
- the KL map is a multi-dimensional map with a plurality of parameters including torque as axes, and various operating conditions that affect the relationship between torque and air quantity, such as ignition timing, engine speed, A / F, valve timing, and the like. Can be set as a parameter. Values obtained from the current operating state information are input to these parameters. However, the ignition timing is set to MBT.
- the required air amount calculation unit 8 calculates the air amount converted from the required torque as the required air amount.
- the control device of the present embodiment includes a throttle opening calculation unit 10 that calculates the throttle opening from the required air amount.
- the throttle opening calculation unit 10 is provided with an air inverse model.
- a physical model of the intake system in which the response of the in-cylinder intake air amount to the operation of the throttle 12 is modeled based on fluid dynamics is referred to as an air model, and the air inverse model is the inverse model.
- the response speed of the actual in-cylinder intake air amount with respect to the required air amount can be freely adjusted by appropriately setting the model parameters.
- the parameters of the air inverse model are set so that the actual in-cylinder intake air amount responds to the required air amount at the highest speed.
- the throttle opening calculation unit 10 calculates the throttle opening converted from the required air amount as the operation amount of the throttle 12, converts the operation amount into a command signal, and outputs the command signal to the throttle 12.
- the control device of the present embodiment is a means for calculating an ignition timing that is an operation amount of the ignition device 20, and an estimated torque calculation unit 14 that calculates an estimated torque based on the throttle opening, and torque efficiency using the estimated torque.
- Torque efficiency is defined as the ratio of the required torque to the estimated torque of the internal combustion engine.
- the estimated torque used for calculating the torque efficiency is calculated based on the actual throttle opening realized by the throttle 12, as will be described below.
- the actual opening of the throttle 12 can be measured by a throttle opening sensor. It can also be calculated from the amount of rotation of the motor that drives the throttle 12.
- the estimated torque calculation unit 14 first calculates the amount of air estimated to be realizable at the current throttle opening.
- the forward model of the aforementioned air model is used for calculating the estimated air amount.
- the air flow rate of the intake pipe measured by the air flow sensor is used as correction data for the calculation using the air model.
- the estimated torque calculation unit 14 converts the estimated air amount into torque using the torque map.
- the torque map is the reverse of the input and output of the KL map described above, with various operating conditions that affect the relationship between torque and air volume, such as ignition timing, engine speed, A / F, and valve timing, as parameters. Can be set. Values obtained from the current operating state information are input to these parameters, but the ignition timing is MBT.
- the estimated torque calculation unit 14 calculates the torque converted from the estimated air amount as the estimated torque in MBT.
- the torque efficiency calculation unit 16 receives the required torque set by the request torque setting unit 2 and the estimated torque calculation unit 14 receives the estimated torque.
- the torque efficiency calculation unit 16 calculates the ratio of the required torque to the estimated torque as the torque efficiency.
- the ignition timing calculation unit 18 converts the torque efficiency into the ignition timing using the ignition timing map.
- the ignition timing map is a multi-dimensional map with a plurality of parameters including torque efficiency as axes, and various operating conditions that affect the determination of ignition timing, such as required torque, A / F, and engine speed, are set as parameters. can do. Values obtained from the current operating state information are input to these parameters.
- the ignition timing map when the torque efficiency is 1 which is the maximum efficiency, the ignition timing is set to MBT, and as the torque efficiency is smaller than 1, the ignition timing is set to be retarded with respect to MBT. According to such a setting, when a difference occurs between the estimated torque and the required torque, the torque difference is compensated by torque adjustment by retarding the ignition timing.
- the ignition timing calculation unit 18 calculates the ignition timing converted from the torque efficiency as an operation amount of the ignition device 20, converts the operation amount into a command signal, and outputs the command signal to the ignition device 20.
- the required efficiency setting unit 4 normally sets the required efficiency independently of the required torque setting by the required torque setting unit 2. However, the setting of the required torque by the required torque setting unit 2 may be reflected in the setting of the required efficiency by the required efficiency setting unit 4. This is a case where the required torque setting unit 2 rapidly increases the set value of the required torque beyond a predetermined increase amount or speed. Whether the increase in the set value of the required torque corresponds to the “rapid increase” reflected in the setting of the required efficiency depends on the range of the increase or increase in the torque that can be realized only by operating the throttle 12. It is judged by whether or not. Therefore, when the set value of the required torque is increased stepwise, the setting of the required torque is reflected in the setting of the required efficiency.
- the required efficiency setting unit 4 temporarily decreases the required efficiency set value with respect to the immediately preceding set value in accordance with the timing at which the required torque set value is rapidly increased.
- the time and amount of decrease in the required efficiency setting value are fixed values. The specific value of the fixed value can be determined by adaptation using an actual machine.
- the required efficiency setting value is temporarily reduced at the timing when the required torque setting value is suddenly increased, that is, when the required torque setting value is suddenly increased.
- the set value of the required efficiency may be temporarily reduced at the timing when the rapid increase of the value is completed.
- FIG. 2 shows a setting example of the required torque for increasing the torque generated by the internal combustion engine, and a setting example of the required efficiency corresponding to the setting example, using a graph with time as the horizontal axis.
- the set value of the required torque is raised discretely.
- the required efficiency setting value is discretely lowered at the timing at which the required torque setting value rises discretely, and then immediately rises to the original value with a constant gradient.
- the set value of the required torque may be raised with a certain gradient.
- the set value of the required efficiency may be reduced to a rectangular shape with reference to the set value immediately before the required torque increases.
- the graph in the third row from the top in FIG. 2 shows the change over time in the required air amount calculated from the required torque and the required efficiency. Since the required air amount is a value obtained by dividing the required torque by the required efficiency into an air amount, if the required torque increases, the required air amount also increases accordingly. Further, if the required efficiency decreases, the required air amount increases accordingly. Therefore, when the required torque and the required efficiency are set as described above, an increase in the required air amount due to a sudden increase in the required torque and an increase in the required air amount due to a temporary decrease in the required efficiency are superimposed. Thus, as shown in the graph, the required air amount temporarily overshoots the value determined only from the required torque after the rapid increase.
- the graph in the fourth row from the top in FIG. 2 shows the time variation of the actual intake air amount realized by calculating the throttle opening based on the required air amount and operating the throttle 12 according to the throttle opening. Show.
- the throttle opening is calculated based on the required amount of air that has temporarily overshooted, so that the throttle 12 operates in an overshooting manner.
- the responsiveness of the amount of air sucked into the cylinder is improved.
- the actual intake air amount is temporarily set to a value determined only from the required torque after the rapid increase. It will overshoot.
- the graph in the fifth row from the top in FIG. 2 shows the time change of the ignition timing set by the control device of the present embodiment.
- the ignition timing is calculated based on the ratio of the required torque to the estimated torque, and the smaller the ratio is, the larger the retard amount of the ignition timing with respect to MBT. Therefore, as described above, when the actual intake air amount overshoots, the estimated torque calculated from the actual intake air amount (estimated air amount) also overshoots the required torque.
- the ignition timing is retarded so as to compensate for the torque difference between the estimated torque and the required torque caused by the overshoot.
- the lowermost graph in FIG. 2 shows the time change of the torque actually generated by the internal combustion engine as a result of the control as described above.
- the broken line in the figure indicates the estimated torque
- the solid line in the figure indicates the actual realized torque. Responsiveness of the actual torque with respect to the required torque is improved by increasing the intake air amount in an overshooting manner as the required torque increases rapidly. At the same time, torque adjustment is performed by retarding the ignition timing so as to compensate for the difference between the estimated torque calculated from the intake air amount and the required torque, preventing the actual torque from overshooting the required torque. Thus, the required torque is ensured.
- the torque when it is desired to rapidly increase the torque generated by the internal combustion engine, the torque can be increased with high responsiveness without impairing torque controllability.
- the first embodiment is an example of a specific form when the first aspect of the present invention is implemented.
- the required torque setting unit 2 corresponds to “means for setting required torque” according to the first aspect of the present invention.
- the required efficiency setting unit 4 corresponds to “means for setting required efficiency” and “means for correcting required efficiency” according to the first aspect of the present invention. In the embodiment, these two means are integrated into the required efficiency setting unit 4, but calculation elements corresponding to the respective means may be provided separately.
- the TA required torque calculation unit 6 and the required air amount calculation unit 8 constitute “means for calculating the required air amount” according to the first aspect of the present invention.
- the throttle opening calculation unit 10 corresponds to “means for calculating the operation amount of the intake actuator” according to the first aspect of the present invention.
- the estimated torque calculation unit 14, the torque efficiency calculation unit 16, and the ignition timing calculation unit 18 constitute "means for calculating the retard amount of the ignition timing” according to the first aspect of the present invention.
- Embodiment 2 FIG. A second embodiment of the present invention will be described with reference to FIG.
- the overall configuration of the control device of the present embodiment is shown in the block diagram of FIG. 1 as in the first embodiment.
- the difference between the control device of the present embodiment and the control device of the first embodiment is in the function as “means for correcting the required efficiency” provided in the required efficiency setting unit 4.
- the required efficiency setting unit 4 sets the required efficiency setting value to the immediately preceding set value in accordance with the timing at which the required torque set value is rapidly increased. To temporarily lower.
- the present embodiment is different from the first embodiment regarding the setting of the reduction amount that temporarily decreases the set value of the required efficiency.
- the amount of decrease in required efficiency is determined according to the speed of the required torque.
- the speed of the required torque can be calculated as an increase amount of the required torque per calculation cycle.
- a required increase speed of torque it may be used as the required torque speed. In any case, the higher the required torque speed, the greater the degree to which the set value of the required torque is rapidly increased.
- FIG. 3 is a graph showing an example of setting the amount of decrease in required efficiency with respect to the required torque speed.
- the relationship between the speed of the required torque and the amount of decrease in the required efficiency is represented on the assumption that the set value immediately before the reduction is 1.0 which is the standard value.
- the amount of temporary decrease in the set value of the required efficiency is increased as the speed of the required torque becomes faster than the normal speed.
- the “normal” speed of the required torque here is a torque increase speed that can be realized only by operating the throttle 12.
- the function of the required efficiency setting unit 4 according to the present embodiment is also effectively exhibited in terms of fuel consumption.
- the graph of FIG. 3 can also be regarded as the amount of decrease in required efficiency being smaller as the speed of the required torque is closer to the normal speed. According to this view, when the speed of the required torque is not very high, that is, when the overshoot operation of the throttle 12 is relatively small, the amount of temporary decrease in the set value of the required efficiency is reduced. Therefore, the retard of the ignition timing, which is disadvantageous in terms of fuel consumption, can be suppressed. That is, according to the control device of the present embodiment, it is possible to improve torque response while minimizing the influence on fuel consumption.
- FIG. 3 A third embodiment of the present invention will be described with reference to FIG.
- FIG. 4 is a block diagram showing the configuration of the control device for the internal combustion engine as the third embodiment of the present invention.
- the control device of the present embodiment is different from the control device of the first embodiment in that the required torque and the required efficiency are respectively supplied from the outside of the control device. Is a point.
- PTM power train manager
- control device and the PTM of the present embodiment may be configured as separate ECUs (Electronic Control Units), or configured as separate programs that operate on separate CPUs provided in a common ECU. Alternatively, they may be configured as separate programs that operate on a common CPU.
- required torque and required efficiency are set independently. That is, in the required efficiency setting stage in the PTM, the process of “temporarily lowering the required efficiency setting value in accordance with the timing when the required torque setting value is rapidly increased” is not performed. In the present embodiment, processing corresponding to this is performed after the control device acquires the required torque and the required efficiency.
- control device In the first embodiment, PTM is not mentioned, but in the first embodiment, the control device itself includes the PTM (or a part of the function). That is, the scope of functions included in the “control device” differs between the present embodiment and the first embodiment.
- the control device of the present embodiment includes a torque rapid increase request detecting unit 22 that detects a torque rapid increase request.
- the required torque input to the TA required torque calculation unit 6 is input to the torque rapid increase request detection unit 22 in parallel.
- the torque rapid increase request detection unit 22 measures the speed of the input requested torque.
- the speed of the required torque can be calculated as an increase amount of the required torque per calculation cycle.
- the torque rapid increase request detection unit 22 compares the speed of the required torque with a predetermined threshold speed, and detects that the required torque speed exceeds the threshold speed as a torque rapid increase request.
- the threshold speed corresponds to the torque increase speed that can be realized only by operating the throttle 12. That is, the torque rapid increase request detection unit 22 determines whether or not the required torque can be realized only by operating the throttle 12, and determines that there is a rapid increase request when it is determined that the required torque is not possible.
- control device includes a required efficiency correction unit 24 that corrects the acquired required efficiency.
- the detection result of the torque rapid increase request by the torque rapid increase request detection unit 22 is reflected in the required efficiency correction unit 24.
- the required efficiency correction unit 24 temporarily reduces the required efficiency value input to the TA required torque calculation unit 6 with respect to the input value immediately before it when a torque sudden increase request is detected. That is, the function as the “means for correcting the required efficiency” provided in the required efficiency setting unit 4 according to the first embodiment is provided in the required efficiency correcting unit 24 in the present embodiment.
- the time and amount of decrease in the required efficiency value may be fixed values. However, if fuel efficiency is also taken into consideration, it is preferable to change the reduction amount of the required efficiency in accordance with the magnitude of the torque rapid increase request, as in the second embodiment.
- the magnitude of the torque rapid increase request can be determined by the speed of the required torque.
- the throttle opening is calculated based on the required air amount temporarily overshooted, so that the throttle 12 operates in an overshoot manner, and the responsiveness of the air amount sucked into the cylinder is improved. As a result, the response of the actual torque to the required torque is also improved.
- the ignition timing is automatically retarded so as to suppress the torque overshoot caused by the sudden increase in the intake air amount. Doing so is prevented.
- the torque when there is a request for a rapid increase in torque to the internal combustion engine, the torque can be increased with high responsiveness without impairing the controllability of the torque.
- the third embodiment is an example of a specific form when the second aspect of the present invention is implemented.
- the TA required torque calculation unit 6 and the required air amount calculation unit 8 constitute “means for calculating the required air amount” according to the second aspect of the present invention.
- the throttle opening calculation unit 10 corresponds to “means for calculating the operation amount of the intake actuator” according to the second aspect of the present invention.
- the estimated torque calculation unit 14, the torque efficiency calculation unit 16, and the ignition timing calculation unit 18 constitute "means for calculating the retard amount of the ignition timing" according to the second aspect of the present invention.
- the torque rapid increase request detecting unit 22 corresponds to “a means for detecting a torque rapid increase request” according to the second aspect of the present invention.
- the required efficiency correction unit 24 corresponds to “means for correcting required efficiency” according to the second aspect of the present invention.
- the present invention is not limited to the above-described embodiment.
- the first and second embodiments include “request torque setting means”, “request efficiency setting means”, “request air amount calculation means”, “intake actuator operation amount calculation means”, “ Although the “ignition timing retarding amount calculating means” and the “required efficiency correcting means” are embodied, the configuration disclosed therein is merely an example of a configuration that these means can take.
- Means “and” Required efficiency correction means are embodied, but the configurations disclosed therein are merely examples of configurations that can be adopted by these means. All configurations capable of realizing the function of each means are included in the scope of each means.
- the throttle is used as the intake actuator in the above-described embodiment
- an intake valve with a variable mechanism that can continuously convert the lift amount or the working angle may be used. In this case, the lift amount or the operating angle becomes the operation amount of the intake actuator.
- the temporary reduction amount of the required efficiency setting value is changed according to the speed of the required torque.
- the reduction rate for temporarily reducing the required efficiency setting value is changed. It's okay. That is, the degree of reduction when the set value of the required efficiency is temporarily reduced includes not only the amount of reduction but also the speed of reduction.
- the decrease time for temporarily reducing the set value of the required efficiency may be changed. In the example of setting the required efficiency shown in FIG. 2, the decrease time here may mean the duration until the required efficiency setting value rises to the original value, and the required efficiency setting value is discrete. It may be the time from falling down to starting to rise (time at low level). It should be noted that the above-described modification relating to the correction of the required efficiency can also be applied to the third embodiment.
- the required torque and the required efficiency are acquired from the outside, but only the required torque, only the required efficiency, or both the required torque and the required efficiency may be set inside the control device. . Any of these modifications are included in the second aspect of the present invention.
- the torque sudden increase request is detected from the speed of the required torque.
- the torque sudden increase request is transmitted from the request torque transmission source (PTM in the third embodiment), and is received by the control device. You may do it.
- PTM request torque transmission source
- Such a modification is also included in the second aspect of the present invention.
- an air inverse model which is a physical model, is used to calculate the throttle opening from the required air amount.
- an air inverse model may be omitted.
- the relationship between the required air amount and the throttle opening can be approximated by a simple function or map.
- the throttle 12 by appropriately setting the parameters, the throttle 12 can be operated so that the actual in-cylinder intake air amount responds to the required air amount at the highest speed. Therefore, from the viewpoint of torque response, it is preferable to use an air inverse model for calculating the throttle opening (the amount of operation of the intake actuator) as in the above-described embodiment.
Abstract
Description
4 要求効率設定部
6 TA用要求トルク算出部
8 要求空気量算出部
10 スロットル開度算出部
12 スロットル
14 推定トルク算出部
16 トルク効率算出部
18 点火時期算出部
20 点火装置
22 トルク急増要求検出部
24 要求効率補正部
本発明の実施の形態1について図1及び図2を用いて説明する。
本発明の実施の形態2について図3を用いて説明する。
本発明の実施の形態3について図4を用いて説明する。
本発明は上述の実施の形態には限定されない。実施の形態1及び2には本発明の1つ目の態様にかかる「要求トルク設定手段」、「要求効率設定手段」、「要求空気量算出手段」、「吸気アクチュエータ操作量算出手段」、「点火時期遅角量算出手段」及び「要求効率補正手段」が具現化されているが、そこに開示されている構成はこれらの手段が採り得る構成の一例にすぎない。また、実施の形態3には本発明の2つ目の態様にかかる「要求空気量算出手段」、「吸気アクチュエータ操作量算出手段」、「点火時期遅角量算出手段」、「トルク急増要求取得手段」及び「要求効率補正手段」が具現化されているが、そこに開示されている構成はこれらの手段が採り得る構成の一例にすぎない。各手段の機能を実現することが可能な全ての構成がそれら各手段の範囲に含まれる。
Claims (8)
- 吸入空気量を調整する吸気アクチュエータの操作と点火時期とによってトルクを制御可能な内燃機関の制御装置において、
要求トルクを設定する要求トルク設定手段と、
要求効率を設定する要求効率設定手段と、
前記要求トルクと前記要求効率とから要求空気量を算出する要求空気量算出手段と、
前記要求空気量に基づいて前記吸気アクチュエータの操作量を算出する吸気アクチュエータ操作量算出手段と、
所定の点火時期設定のもとで前記操作量によって前記吸気アクチュエータを操作した場合のトルクを算出し、そのトルクと前記要求トルクとのずれに基づいて前記要求トルクの実現に必要な点火時期の遅角量を算出する点火時期遅角量算出手段と、
前記要求トルク設定手段において前記要求トルクの設定値が所定の増加量又は増加速度を超えて急増される場合には、前記要求トルクの設定値の急増に合わせて前記要求効率の設定値を一時的に低下させる要求効率補正手段と、
を備えることを特徴とする内燃機関の制御装置。 - 前記要求効率補正手段は、前記要求トルク設定手段により前記要求トルクの設定値が急増される度合に応じて、前記要求効率の設定値を一時的に低下させる度合を決定することを特徴とする請求項1記載の内燃機関の制御装置。
- 前記要求効率補正手段は、前記要求トルク設定手段により前記要求トルクの設定値が急増される度合に応じて、前記要求効率の設定値を一時的に低下させる時間を決定することを特徴とする請求項1又は2記載の内燃機関の制御装置。
- 吸入空気量を調整する吸気アクチュエータの操作と点火時期とによってトルクを制御可能な内燃機関の制御装置において、
要求トルクと要求効率とを取得して前記要求トルクと前記要求効率とから要求空気量を算出する要求空気量算出手段と、
前記要求空気量に基づいて前記吸気アクチュエータの操作量を算出する吸気アクチュエータ操作量算出手段と、
所定の点火時期設定のもとで前記操作量によって前記吸気アクチュエータを操作した場合のトルクを算出し、そのトルクと前記要求トルクとのずれに基づいて前記要求トルクの実現に必要な点火時期の遅角量を算出する点火時期遅角量算出手段と、
トルクの急増要求を検出するトルク急増要求取得手段と、
前記トルク急増要求が検出されたときには、前記要求空気量の算出に使用される要求効率の値を一時的に低下させる要求効率補正手段と、
を備えることを特徴とする内燃機関の制御装置。 - 前記トルク急増要求取得手段は、前記要求トルクの変化量又は変化速度から前記トルク急増要求を検出することを特徴とする請求項4記載の内燃機関の制御装置。
- 前記トルク急増要求は、前記要求トルクの発信源から前記要求トルクとともに発信されていることを特徴とする請求項4記載の内燃機関の制御装置。
- 前記要求効率補正手段は、前記トルク急増要求の大きさに応じて、前記要求空気量の算出に使用される要求効率の値を一時的に低下させる度合を決定することを特徴とする請求項4乃至5の何れか1項に記載の内燃機関の制御装置。
- 前記要求効率補正手段は、前記トルク急増要求の大きさに応じて、前記要求空気量の算出に使用される要求効率の値を一時的に低下させる時間を決定することを特徴とする請求項4乃至7の何れか1項に記載の内燃機関の制御装置。
Priority Applications (6)
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US12/673,954 US8090519B2 (en) | 2008-10-31 | 2008-10-31 | Control device for internal combustion engine |
KR1020107003894A KR101080659B1 (ko) | 2008-10-31 | 2008-10-31 | 내연 기관의 제어 장치 |
CN2008801066386A CN101828020B (zh) | 2008-10-31 | 2008-10-31 | 内燃机的控制装置 |
EP08876721.5A EP2351924B1 (en) | 2008-10-31 | 2008-10-31 | Internal combustion engine controller |
PCT/JP2008/069940 WO2010050061A1 (ja) | 2008-10-31 | 2008-10-31 | 内燃機関の制御装置 |
JP2010507742A JP4816813B2 (ja) | 2008-10-31 | 2008-10-31 | 内燃機関の制御装置 |
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PCT/JP2008/069940 WO2010050061A1 (ja) | 2008-10-31 | 2008-10-31 | 内燃機関の制御装置 |
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JP2013151892A (ja) * | 2012-01-25 | 2013-08-08 | Nissan Motor Co Ltd | 内燃機関の制御装置 |
JP6248548B2 (ja) * | 2013-10-31 | 2017-12-20 | 株式会社デンソー | 車両制御装置 |
US20160124411A1 (en) * | 2014-10-31 | 2016-05-05 | Qualcomm Incorporated | Distributed energy demand management |
JP6168484B2 (ja) * | 2015-11-20 | 2017-07-26 | マツダ株式会社 | エンジンの制御装置 |
JP6834752B2 (ja) * | 2017-04-28 | 2021-02-24 | トヨタ自動車株式会社 | 過給機付き内燃機関の制御装置 |
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