WO2012095988A1 - 過給機付き内燃機関の制御装置 - Google Patents
過給機付き内燃機関の制御装置 Download PDFInfo
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- WO2012095988A1 WO2012095988A1 PCT/JP2011/050538 JP2011050538W WO2012095988A1 WO 2012095988 A1 WO2012095988 A1 WO 2012095988A1 JP 2011050538 W JP2011050538 W JP 2011050538W WO 2012095988 A1 WO2012095988 A1 WO 2012095988A1
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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
- 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
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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
- F02D23/00—Controlling engines characterised by their being supercharged
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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
- F02D23/00—Controlling engines characterised by their being supercharged
- F02D23/02—Controlling engines characterised by their being supercharged the engines being of fuel-injection type
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02D41/1401—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
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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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- 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
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a control device for an internal combustion engine with a supercharger, and more particularly to a control device for an internal combustion engine with a supercharger capable of actively controlling the supercharging pressure as well as the air amount according to a target torque.
- torque demand control is known in which the operation amount of each actuator is determined using torque as a control amount.
- a target torque that is a target value of the control amount is determined based on a torque request from a driver estimated from an accelerator pedal operation or a torque request from a vehicle control device such as VSC or TRC.
- a target air amount is determined from a target torque, and an actuator for air amount control is operated according to the target air amount.
- the torque demand control described above can also be applied to an internal combustion engine equipped with a turbocharger or a mechanical supercharger.
- Some of such internal combustion engines with a supercharger can actively control the supercharging pressure.
- an internal combustion engine described in Japanese Patent Application Laid-Open No. 2006-242062 includes a turbocharger with an electric motor. By assisting the rotation of the compressor by the electric motor, the supercharging pressure can be actively controlled.
- the internal combustion engine described in JP 2007-056797 A includes a turbocharger with a wastegate valve. By controlling the wastegate valve to increase or decrease the flow rate of the exhaust gas flowing into the turbine, the supercharging pressure can be actively controlled.
- the supercharging pressure can be actively controlled by an air bypass valve or a variable nozzle of the turbine.
- the torque demand control determines the target supercharging pressure together with the target air amount from the target torque as described in, for example, Japanese Patent Application Laid-Open No. 2006-242062. Then, the supercharging pressure control actuator is operated in accordance with the target supercharging pressure.
- the target boost pressure from the target torque it is possible to use a map obtained by measuring the boost pressure required for realizing the torque for each operating condition and mapping it.
- vehicle vibration suppression control a method of suppressing vibrations on a body spring, in particular, pitching vibrations by torque control of an internal combustion engine.
- vehicle vibration suppression control pitching vibration corresponding to the current driving force is obtained from a vibration model of the vehicle body, and a high-frequency torque that cancels the pitching vibration is calculated.
- the high-frequency torque component for damping is added to the low-frequency torque calculated based on the accelerator pedal operation amount.
- torque control of the internal combustion engine is performed using the total torque of the high frequency torque component and the low frequency torque component as a target torque.
- the target supercharging pressure is determined based on the target torque including a high-frequency torque component for damping. Since the high frequency component included in the target torque is directly reflected in the target supercharging pressure, the target supercharging pressure when the vehicle vibration suppression control is performed includes a high frequency pressure component. In this case, the supercharging pressure control actuator is operated so as to vibrately change the supercharging pressure in accordance with the target supercharging pressure including the high frequency pressure component.
- the target air amount can be realized by reducing the throttle.
- the target air amount cannot be realized by adjusting the throttle opening.
- the maximum amount of air that can be drawn into the cylinder is determined by the actual boost pressure. If the actual boost pressure is insufficient with respect to the target boost pressure, the maximum air amount will be smaller than the target air amount. It is because it ends up. For this reason, as shown in the upper graph of FIG. 15, the waveform of the torque that can be actually realized is different from that of the target torque, and it is impossible to give the torque necessary for damping the vehicle to the torque. Become.
- the supercharging pressure can be actively controlled according to the target torque.
- the target torque since there is a response delay between the target boost pressure and the actual boost pressure, when the target torque includes a high-frequency vibration component, the target torque may not be realized with high accuracy. there were.
- this invention provides the control apparatus of the internal combustion engine with a supercharger as follows.
- the control device determines a target torque based on various torque requests such as a torque request from a driver and a torque request from a vehicle control element.
- the target torque determined by this controller is necessary for low-frequency torque components that are always set based on the torque requested by the driver and for specific vehicle control represented by vehicle sprung mass damping control. And a high-frequency torque component set according to the above.
- the control device determines a target air amount and a target air amount from the target torque, operates an air amount control actuator according to the target air amount, and operates a supercharging pressure control actuator according to the target supercharging pressure.
- this control apparatus comprises a target supercharging pressure with the pressure component corresponding to a low frequency torque component, when a target torque contains only a low frequency torque component.
- the target supercharging is performed using a pressure component corresponding to the low-frequency torque component and a pressure component corresponding to a fixed torque component greater than the maximum amplitude of the high-frequency torque component. Make up pressure.
- the target supercharging pressure is set to a higher value that does not include a high-frequency component, so the target supercharging pressure and the actual supercharging pressure It is possible to avoid a transient shortage of the supercharging pressure due to the shift in the time axis direction. Therefore, the target torque can be realized with high accuracy.
- the control device determines the low frequency torque component as the boost pressure determining torque.
- the target torque includes a low-frequency torque component and a high-frequency torque component
- the torque obtained by converting the high-frequency torque component into a fixed torque component having a maximum amplitude or greater and adding the fixed torque component to the low-frequency torque component Is determined as the boost pressure determining torque.
- the present control device converts the boost pressure determining torque into the boost pressure according to a predetermined conversion rule, and determines the boost pressure obtained by the conversion as the target boost pressure.
- the present control device converts the target torque into a supercharging pressure (hereinafter referred to as a supercharging pressure conversion value) according to a predetermined conversion rule.
- a supercharging pressure conversion value is determined as the target boost pressure.
- the target torque includes a low-frequency torque component and a high-frequency torque component
- the high-frequency pressure component of the boost pressure conversion value corresponding to the high-frequency torque component is converted to a fixed pressure component having a maximum amplitude or more, and the low-frequency torque
- the pressure value obtained by adding the fixed pressure component to the low frequency pressure component of the boost pressure conversion value corresponding to the component is determined as the target boost pressure.
- the present control device when the target torque includes only the low frequency torque component, the present control device configures the target boost pressure by the pressure component corresponding to the low frequency torque component.
- the target torque when the target torque includes a low-frequency torque component and a high-frequency torque component, the target supercharging is performed using a pressure component corresponding to the low-frequency torque component and a pressure component corresponding to the high-frequency torque component delayed in the time axis direction. Make up pressure.
- the delay time for delaying the high frequency torque component is such that the total time of the delay time and the response delay time of the actual supercharging pressure with respect to the operation of the supercharging pressure control actuator is an integral multiple of the period of the high frequency torque component.
- the target torque when the target torque includes a high-frequency vibration component, the phase of the actual boost pressure is matched with the phase of the vibration component, so the time axis between the target boost pressure and the actual boost pressure It is possible to avoid a transient shortage of supercharging pressure due to a deviation in direction. Therefore, the target torque can be realized with high accuracy.
- the control device determines the low frequency torque component as the boost pressure determining torque.
- the target torque includes a low-frequency torque component and a high-frequency torque component
- the high-frequency torque component is delayed by the delay time, and the torque obtained by adding the delayed high-frequency torque component to the low-frequency torque component is obtained. It is determined as the boost pressure determining torque.
- the present control device converts the boost pressure determining torque into the boost pressure according to a predetermined conversion rule, and determines the boost pressure obtained by the conversion as the target boost pressure.
- the present control device converts the target torque into a supercharging pressure (hereinafter referred to as a supercharging pressure conversion value) according to a predetermined conversion rule.
- a supercharging pressure conversion value is determined as the target boost pressure.
- the target torque includes a low-frequency torque component and a high-frequency torque component
- the high-frequency pressure component of the boost pressure conversion value corresponding to the high-frequency torque component is delayed by the delay time, and the excess torque corresponding to the low-frequency torque component is delayed.
- a pressure value obtained by adding the high frequency pressure component delayed to the low frequency pressure component of the supply pressure conversion value is determined as the target supercharging pressure.
- the frequency of the high frequency pressure component obtained from the high frequency torque component of the target torque is too high, it may not be realized depending on the performance of the supercharging pressure control actuator.
- the high pressure component is converted into a fixed pressure component having a maximum amplitude or higher, and the pressure value obtained by adding the fixed pressure component to the low frequency pressure component is determined as the target supercharging pressure. Also good.
- Embodiment 1 of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, and FIG.
- An internal combustion engine with a supercharger (hereinafter referred to as an engine) to be controlled in each embodiment of the present invention is a four-cycle reciprocating engine capable of controlling torque by adjusting an air amount by a throttle.
- a supercharger provided in an engine is a turbocharger that drives a compressor disposed in an intake passage by rotation of a turbine disposed in an exhaust passage.
- the turbocharger is provided with a waste gate valve (hereinafter referred to as WGV) whose opening degree can be adjusted.
- WGV waste gate valve
- the control device controls the operation of the engine by operating an actuator provided in the engine.
- the actuator that can be operated by the control device includes an ignition device, a throttle, a fuel injection device, a variable valve timing mechanism, a WGV, and the like. However, in this embodiment, the control device operates a throttle that is an actuator for controlling the air amount and a WGV that is an actuator for controlling the supercharging pressure. The control device operates these two actuators to control the torque output from the engine.
- the control device 2 shown in the block diagram of FIG. 1 shows the configuration of the control device of the present embodiment.
- each of the elements 12, 14, 16, 18, 20, and 22 constituting the control device 2 is the air amount control by the operation of the throttle 102 and the WGV 104 among various functional elements of the control device 2. Only the elements relating to the supercharging pressure control by the operation of are specially represented in the figure. Therefore, FIG. 1 does not mean that the control device 2 is composed of only these elements.
- Each element may be configured by dedicated hardware, or the hardware may be shared and virtually configured by software.
- the configuration of the control device 2 will be described focusing on the functions of the elements 12, 14, 16, 18, 20, and 22 shown in FIG.
- the control device 2 receives a torque request from the driver represented by the operation amount and operation speed of the accelerator pedal.
- a torque request for vehicle control is also input from a vehicle control device such as VSC or TRC. This includes a torque request for vehicle damping control that suppresses pitching vibration.
- VSC vehicle control device
- TRC vehicle control device
- the torque request signal input to the control device 2 is processed by the target torque determination unit 12.
- the target torque determination unit 12 has a function of determining a target torque to be output to the engine based on each torque request.
- FIG. 2 is a block diagram illustrating a configuration of the target torque determination unit 12.
- the target torque determination unit 12 includes a low frequency torque component generation unit 121 and a high frequency torque component generation unit 122.
- the low frequency torque component generation unit 121 generates a torque component for satisfying the torque request from the driver.
- the high frequency torque component generator 122 generates a torque component necessary for vehicle vibration suppression control.
- the former torque component has a low frequency while the latter torque component has a high frequency, and there is a clear difference in frequency between the two.
- the target torque determination unit 12 outputs a torque obtained by adding the high frequency torque component to the low frequency torque component as the target torque.
- the control device 2 determines the target air amount from the target torque. Therefore, the target torque output from the target torque determination unit 12 is input to the torque-air amount conversion unit 14.
- the torque-air amount conversion unit 14 converts the target torque into an air amount using a conversion map prepared in advance.
- the air amount here means the amount of air sucked into the cylinder.
- the conversion map is based on the premise that the ignition timing is the optimal ignition timing (the more retarded ignition timing of the MBT and the trace knock ignition timing), and the air-fuel ratio is the target air-fuel ratio (for example, stoichiometric).
- the torque and the air amount are associated with each other using various engine state amounts including the engine speed as a key.
- the air amount necessary for realizing the target torque is determined as the target air amount of the engine.
- the target air amount is input to the air amount control unit 16.
- the air amount control unit 16 converts the target air amount into the target throttle opening using an inverse model of the air model. Since the air model is a physical model that models the response characteristic of the air amount to the operation of the throttle, the throttle opening required to achieve the target air amount can be calculated backward by using the inverse model. In the inverse model of the air model, the actual boost pressure actually measured or estimated is used as a parameter. Therefore, the air amount control unit 16 calculates the throttle opening necessary for realizing the target air amount as the target throttle opening under the actual supercharging pressure. The air amount control unit 16 operates the throttle 102 in accordance with the calculated target throttle opening.
- control device 2 determines the target boost pressure from the target torque in parallel with determining the target air amount from the target torque.
- the high frequency torque component correction unit 18 and the torque-supercharging pressure conversion unit 20 are used.
- One feature of the present embodiment lies in the content of processing for determining the target boost pressure from the target torque described below.
- FIG. 3 is a block diagram showing the configuration of the high-frequency torque component correction unit 18.
- the high frequency torque component correction unit 18 receives the target torque output from the target torque determination unit 12.
- the target torque includes a low-frequency torque component as a basic component, and further includes a high-frequency torque component when vehicle damping control is performed.
- the high frequency torque component correction unit 18 has a low-pass filter 181 for removing a high frequency torque component from the target torque when the target torque includes the high frequency torque component. There is a clear frequency difference between the high frequency torque component and the low frequency torque component constituting the target torque. For this reason, by passing the target torque through the low-pass filter 181, it is possible to remove the high-frequency torque component and extract only the low-frequency torque component. Further, the high frequency torque component correction unit 18 extracts a high frequency torque component included in the target torque by subtracting the low frequency torque component from the original target torque.
- the high frequency torque component extracted from the target torque is input to the conversion unit 182.
- the converter 182 converts the high frequency torque component into a fixed torque component without vibration. Specifically, the value of the maximum amplitude of the high frequency torque component is acquired, and a value obtained by multiplying the maximum amplitude of the high frequency torque component by a predetermined coefficient is set as the fixed torque component.
- the maximum amplitude of the high-frequency torque component is taken into the conversion unit 182 as known information when the vehicle vibration suppression control is performed.
- the coefficient used for calculating the fixed torque component is a value of 1 or more, and the value is switched according to the engine operation mode. For example, the coefficient value is set to 1 if the driving mode places importance on fuel efficiency, and the coefficient value is set to a value greater than 1 if the driving mode places importance on response.
- the high frequency torque component correction unit 18 adds the fixed torque component obtained by the conversion unit 182 to the low frequency torque component. Then, the total torque of the fixed torque component and the low frequency torque component is output as the boost pressure determining torque. However, the supercharging pressure determination torque includes both the fixed torque component and the low frequency torque component only when the vehicle vibration suppression control is performed. When the vehicle vibration suppression control is not performed, the target torque includes only the low frequency torque component, so the low frequency torque component is output as it is as the boost pressure determining torque.
- the torque-supercharging pressure conversion unit 20 converts the supercharging pressure determination torque into the supercharging pressure using a conversion map prepared in advance.
- the conversion map is obtained by measuring the supercharging pressure necessary for realizing the torque for each operating condition and mapping it.
- the supercharging pressure necessary for realizing the supercharging pressure determining torque is determined as the target supercharging pressure. If the boost pressure determining torque includes only the low frequency torque component, the target boost pressure also includes only the low frequency pressure component. On the other hand, if the boost pressure determining torque includes a low frequency torque component and a fixed torque component, the target boost pressure includes a low frequency pressure component and a pressure component corresponding to the fixed torque component.
- FIG. 4 shows the content of the process for determining the target boost pressure from the target torque performed by the control device 2 in a graph of torque and boost pressure.
- the time axes of the two graphs are the same.
- the supercharging pressure determining torque is set by replacing the high-frequency torque component with a fixed torque component having a maximum amplitude or more.
- the boost pressure determining torque is converted into the boost pressure by the conversion map, and the boost pressure obtained by the conversion is determined as the target boost pressure.
- the target supercharging pressure does not include a high-frequency pressure component, and the target supercharging pressure is a value necessary for realizing the target torque (the target torque indicated by a dotted line in the graph).
- the supercharging pressure in the case of direct conversion is set to a larger value.
- the target boost pressure determined by the above processing is input to the boost pressure control unit 22.
- the supercharging pressure control unit 22 calculates the opening degree of the WGV 104 necessary for realizing the target supercharging pressure as the target WGV opening degree. For calculation of the target WGV opening, various engine state quantities such as engine speed and load are used as parameters.
- the supercharging pressure control unit 22 operates the WGV 104 according to the calculated target WGV opening.
- the actual supercharging pressure changes with a delay in response to the operation of the WGV104.
- the target boost pressure is set as shown by the dotted line in the lower graph of FIG. 4
- the transient boost pressure is caused by the time-axis direction deviation between the target boost pressure and the actual boost pressure. Shortage will occur.
- the target boost pressure is set to a higher value that does not include a high frequency component, as indicated by a solid line in the lower graph of FIG. .
- a shortage of transient supercharging pressure can be avoided, and a target torque including a high frequency torque for damping can be realized with high accuracy.
- Embodiment 2 a second embodiment of the present invention will be described with reference to FIG. 5, FIG. 6, and FIG.
- the control device 4 shown in the block diagram of FIG. 5 shows the configuration of the control device of the present embodiment.
- the control device 4 of the present embodiment and the control device 2 of the first embodiment are different in the content of the process for determining the target boost pressure.
- the high frequency torque component correction unit 18 and the torque-supercharging pressure conversion unit 20 are used for determining the target supercharging pressure.
- the torque-supercharging pressure conversion unit 20 and a high-frequency pressure component correction unit 24 described later are used for determining the target supercharging pressure.
- the target torque output from the target torque determination unit 12 is input to the torque-supercharging pressure conversion unit 20 in parallel with being input to the torque-air amount conversion unit 14.
- the target torque input to the torque-supercharging pressure conversion unit 20 is converted into supercharging pressure by the above-described conversion map.
- the supercharging pressure (hereinafter referred to as supercharging pressure conversion value) obtained by this conversion reflects the vibration component of the target torque as it is. That is, if the target torque includes only the low frequency torque component, the boost pressure conversion value also includes only the low frequency pressure component. On the other hand, if the target torque includes a low frequency torque component and a high frequency torque component, the boost pressure conversion value also includes a low frequency pressure component and a high frequency pressure component.
- FIG. 6 is a block diagram illustrating a configuration of the high-frequency pressure component correction unit 24.
- the high-frequency pressure component correction unit 24 includes a low-pass filter 241 for removing a high-pressure pressure component from the boost pressure conversion value when the boost pressure conversion value includes a high-frequency pressure component.
- the frequency of the high frequency pressure component is equal to that of the high frequency torque component constituting the target torque, and the frequency of the low frequency pressure component is equal to that of the low frequency torque component constituting the target torque. Therefore, there is a clear frequency difference between the high frequency pressure component and the low frequency pressure component.
- the boost pressure conversion value through the low-pass filter 241, it is possible to remove the high-frequency pressure component and extract only the low-frequency pressure component. Further, the high frequency pressure component correction unit 24 extracts the high frequency pressure component included in the boost pressure conversion value by subtracting the low frequency pressure component from the original boost pressure conversion value.
- the high frequency pressure component extracted from the boost pressure conversion value is input to the conversion unit 242.
- the converter 242 converts the high frequency pressure component into a fixed pressure component without vibration. Specifically, the maximum amplitude of the high frequency pressure component is calculated from the maximum amplitude of the high frequency torque component, and a value obtained by multiplying the maximum amplitude of the high frequency pressure component by a predetermined coefficient is set as the fixed pressure component.
- the coefficient used for calculating the fixed pressure component is a value of 1 or more, and the value is switched according to the engine operation mode. For example, the coefficient value is set to 1 if the driving mode places importance on fuel efficiency, and the coefficient value is set the a value greater than 1 if the driving mode places importance on response.
- the high frequency pressure component correction unit 24 outputs a pressure value obtained by adding the fixed pressure component obtained by the conversion unit 242 to the low frequency pressure component as a target supercharging pressure.
- the target supercharging pressure includes both the fixed pressure component and the low frequency pressure component only when the vehicle vibration suppression control is performed.
- the target torque includes only the low frequency torque component, so the low frequency pressure component converted from the low frequency torque component is output as the target boost pressure as it is.
- FIG. 7 shows the content of processing for determining the target boost pressure from the target torque performed by the control device 4 in a graph of torque and boost pressure.
- the time axes of the two graphs are the same.
- the target torque is directly converted into the supercharging pressure by the conversion map. Therefore, when the target torque includes a high-frequency torque component as shown in the upper graph, a boost pressure conversion value including a high-frequency pressure component as shown by a dotted line in the lower graph is obtained. And the thing which replaced the high frequency pressure component of this supercharging pressure conversion value with the fixed pressure component more than the maximum amplitude is determined as a target supercharging pressure.
- the target boost pressure does not include a high-frequency pressure component, and the target boost pressure is greater than the boost pressure conversion value obtained by directly converting the target torque. It will be set to a large value.
- the target supercharging pressure is set to a higher value that does not include the high frequency component. .
- Embodiment 3 FIG. Next, Embodiment 3 of the present invention will be described with reference to FIG. 8, FIG. 9, and FIG.
- the control device 6 shown in the block diagram of FIG. 8 shows the configuration of the control device of the present embodiment.
- the control device 6 of the present embodiment and the control device 2 of the first embodiment are different in the content of the process for determining the target boost pressure.
- the high frequency torque component delay unit 26 and the torque-supercharging pressure conversion unit 20 are used for determining the target supercharging pressure.
- FIG. 9 is a block diagram showing a configuration of the high frequency torque component delay unit 26.
- the high frequency torque component delay unit 26 includes a low pass filter 261 for removing a high frequency torque component from the target torque when the target torque includes the high frequency torque component. Further, the high frequency torque component delay unit 26 extracts a high frequency torque component included in the target torque by subtracting the low frequency torque component from the original target torque.
- the high frequency torque component extracted from the target torque is input to the delay circuit 262.
- the delay circuit 262 delays the input high-frequency torque component in the time axis direction and then outputs it.
- the delay time for delaying the high frequency torque component in the delay circuit 262 is set so that the total time of the delay time and the response delay time of the actual supercharging pressure with respect to the operation of the WGV 104 is an integral multiple of the period of the high frequency torque component. The effect of setting the delay time in this way will be described later. Since the response delay time depends on the engine operating state such as the engine speed, the delay circuit 262 changes the delay time setting according to the engine operating state.
- the high frequency torque component delay unit 26 adds the high frequency torque component delayed by the delay circuit 262 to the low frequency torque component. Then, the total torque of the low frequency torque component and the delayed high frequency torque component is output as the boost pressure determining torque. However, when the vehicle vibration suppression control is not performed, the target torque includes only the low frequency torque component, so the low frequency torque component is determined as it is as the boost pressure determining torque.
- the boost pressure determining torque obtained by the high frequency torque component delay unit 26 is input to the torque-supercharge pressure conversion unit 20.
- the boost pressure determining torque input to the torque-supercharge pressure conversion unit 20 is converted into a boost pressure by the above-described conversion map. Then, the boost pressure converted from the boost pressure determining torque is determined as the target boost pressure. If the boost pressure determining torque includes only the low frequency torque component, the target boost pressure also includes only the low frequency pressure component. On the other hand, if the boost pressure determining torque includes a low frequency torque component and a high frequency torque component, the target boost pressure also includes a low frequency pressure component and a high frequency pressure component.
- FIG. 10 shows the content of processing for determining the target boost pressure from the target torque performed by the control device 6 in a graph of torque and boost pressure.
- the time axes of the two graphs are the same.
- the boost pressure determining torque is set by delaying the high-frequency torque component in the time axis direction.
- this boost pressure determining torque is converted into a boost pressure by the conversion map, and the boost pressure obtained by the conversion is determined as the target boost pressure.
- the target boost pressure is delayed with respect to the target torque.
- the total time of the delay time for delaying the high frequency torque component and the response delay time of the actual supercharging pressure with respect to the operation of the WGV 104 is an integral multiple of the cycle of the high frequency torque component.
- the phase of the actual supercharging pressure (indicated by the solid line in the lower graph) realized by the operation of the WGV 104 based on the target supercharging pressure coincides with the phase of the high-frequency torque included in the target torque.
- the phase of the actual supercharging pressure is matched with the phase of the high frequency torque.
- the control device 6 since the actual supercharging pressure can be set to an optimum value according to the target torque, it is possible to minimize the throttle 102. Thereby, the effect that a pump loss can be made small and deterioration of a fuel consumption can be suppressed is also acquired.
- Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described with reference to FIG. 11, FIG. 12, and FIG.
- the control device 8 shown in the block diagram of FIG. 11 shows the configuration of the control device of the present embodiment.
- the control device 8 according to the present embodiment has a pressure component and a high-frequency torque corresponding to the low-frequency torque component as in the control device 6 according to the third embodiment.
- the target supercharging pressure is constituted by the pressure component corresponding to the component delayed in the time axis direction.
- the control device 8 according to the present embodiment and the control device 6 according to the third embodiment have different specific processing contents for determining the target supercharging pressure.
- the torque-supercharging pressure conversion unit 20 and the high frequency pressure component delay unit 28 are used for determining the target supercharging pressure.
- the target torque output from the target torque determination unit 12 is input to the torque-supercharging pressure conversion unit 20 in parallel with being input to the torque-air amount conversion unit 14.
- the target torque input to the torque-supercharging pressure conversion unit 20 is converted into supercharging pressure by the above-described conversion map.
- the supercharging pressure (hereinafter referred to as supercharging pressure conversion value) obtained by this conversion reflects the vibration component of the target torque as it is. That is, if the target torque includes only the low frequency torque component, the boost pressure conversion value also includes only the low frequency pressure component. On the other hand, if the target torque includes a low frequency torque component and a high frequency torque component, the boost pressure conversion value also includes a low frequency pressure component and a high frequency pressure component.
- the boost pressure conversion value output from the torque-supercharging pressure conversion unit 20 is input to the high frequency pressure component delay unit 28.
- FIG. 12 is a block diagram showing the configuration of the high-frequency pressure component delay unit 28.
- the high frequency pressure component delay unit 28 includes a low pass filter 281 for removing a high pressure component from the boost pressure conversion value when the boost pressure conversion value includes a high frequency pressure component. By passing the boost pressure conversion value through the low-pass filter 281, only the low frequency pressure component can be extracted by removing the high frequency pressure component. Further, the high frequency pressure component delay unit 28 extracts the high frequency pressure component included in the boost pressure conversion value by subtracting the low frequency pressure component from the original boost pressure conversion value.
- the extracted high frequency pressure component is input to the delay circuit 282.
- the delay circuit 282 delays the input high-frequency pressure component in the time axis direction and then outputs it.
- the delay time for delaying the high frequency pressure component in the delay circuit 282 is set such that the total time of the delay time and the response delay time of the actual supercharging pressure with respect to the operation of the WGV 104 is an integral multiple of the period of the high frequency torque component. Since the response delay time depends on the engine operating state such as the engine speed, the delay circuit 282 changes the delay time setting according to the engine operating state.
- the high frequency pressure component delay unit 28 outputs a pressure value obtained by adding the high frequency pressure component delayed by the delay circuit 282 to the low frequency pressure component as a target supercharging pressure.
- the low frequency pressure component converted from the low frequency torque component is output as the target boost pressure as it is.
- FIG. 13 shows the content of processing for determining the target boost pressure from the target torque performed by the control device 8 in a graph of torque and boost pressure.
- the time axes of the two graphs are the same.
- the target torque is directly converted into the supercharging pressure by the conversion map. For this reason, when the target torque includes a high-frequency torque component as shown in the upper graph, a boost pressure conversion value including a high-frequency pressure component as shown by a one-dot chain line in the lower graph is obtained.
- the target boost pressure is determined by delaying the high-frequency pressure component of the boost pressure conversion value in the time axis direction. As a result, as shown by the solid line in the lower graph, the target boost pressure is delayed with respect to the target torque.
- the total time of the delay time for delaying the high frequency pressure component and the response delay time of the actual boost pressure with respect to the operation of the WGV 104 is an integral multiple of the cycle of the high frequency torque component.
- the phase of the actual supercharging pressure (indicated by the solid line in the lower graph) realized by the operation of the WGV 104 based on the target supercharging pressure coincides with the phase of the high-frequency torque included in the target torque.
- the phase of the actual boost pressure is matched with the phase of the high frequency torque.
- the actual supercharging pressure is set to an optimum value according to the target torque, it is possible to reduce the pump loss and suppress the deterioration of fuel consumption.
- Embodiment 5 FIG. Finally, Embodiment 5 of the present invention will be described with reference to FIG.
- the control device of the present embodiment is based on the control device 8 of the fourth embodiment. However, in addition to the high frequency pressure component delay unit 28 of the fourth embodiment, the control device of the present embodiment serves as a means for determining the target boost pressure from the boost pressure conversion value, in addition to the high frequency of the second embodiment. A pressure component correction unit 24 is also provided. These two elements 24 and 28 are properly used according to the flowchart of FIG.
- the frequency of the high frequency pressure component included in the boost pressure conversion value is a feasible frequency. Due to the response performance of the WGV 104, there is a limit to the frequency of the supercharging pressure that can be realized. The maximum frequency that can be realized is measured in advance for each engine operating condition and used in the determination in step S2.
- step S6 When the frequency of the high frequency pressure component is less than the realizable frequency, the process of step S6 is performed as a process for determining the target boost pressure.
- the high-frequency pressure component delay unit 28 according to the fourth embodiment is used, and the target boost pressure is determined by delaying the high-frequency pressure component of the boost pressure conversion value in the time axis direction. That is, in this case, the target boost pressure is vibrated at a frequency corresponding to the high frequency torque component included in the target torque. According to this, since the actual supercharging pressure is set to an optimum value according to the target torque, it is possible to reduce the pump loss and suppress the deterioration of fuel consumption.
- step S4 when the frequency of the high-frequency pressure component exceeds a realizable frequency, the process of step S4 is performed as a process for determining the target boost pressure.
- the high-frequency pressure component correction unit 24 according to the second embodiment is used, and the target supercharging pressure is determined by replacing the high-frequency pressure component of the boost pressure conversion value with a fixed pressure component having a maximum amplitude or more. . That is, in this case, oscillating the target boost pressure at a high frequency stops. According to this, the actual supercharging pressure cannot follow the frequency of the target torque, and as a result, it is possible to prevent the supercharging pressure from becoming insufficient temporarily.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
- the actual boost pressure is used as the boost pressure information for calculating the throttle opening, but the target boost pressure can also be used as the boost pressure information.
- the turbo lag in the transient state it is more preferable to use the actual supercharging pressure as in the above-described embodiment.
- an intake valve variable lift mechanism can be used in addition to the throttle.
- an air bypass valve in addition to the WGV, an air bypass valve, an electric motor for assisting the rotation of the compressor, a variable nozzle of the turbine, and the like can be used.
- a mechanical supercharger that drives the compressor by the torque taken out from the output shaft of the engine can be used.
- an air bypass valve can be used as the supercharging pressure control actuator.
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
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Abstract
Description
本発明の実施の形態1について図1、図2、図3及び図4を参照して説明する。
次に、本発明の実施の形態2について図5、図6及び図7を参照して説明する。
次に、本発明の実施の形態3について図8、図9及び図10を参照して説明する。
次に、本発明の実施の形態4について図11、図12及び図13を参照して説明する。
最後に、本発明の実施の形態5について図14を参照して説明する。
本発明は上述の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々変形して実施することができる。例えば、上述の実施の形態ではスロットル開度を計算するための過給圧情報として実過給圧を用いるが、目標過給圧を過給圧情報として用いることもできる。ただし、過渡状態でのターボラグを考慮すると、上述実施の形態のように実過給圧を用いることがより好ましい。
12 目標トルク決定部
14 トルク-空気量変換部
16 空気量制御部
18 高周波トルク成分補正部
20 トルク-過給圧変換部
22 過給圧制御部
24 高周波圧力成分補正部
26 高周波トルク成分ディレイ部
28 高周波圧力成分ディレイ部
102 スロットル
104 ウエストゲートバルブ
Claims (7)
- 過給機付き内燃機関に出力させる目標トルクを決定する目標トルク決定手段と、
前記目標トルクから目標空気量を決定する目標空気量決定手段と、
前記目標トルクから目標過給圧を決定する目標過給圧決定手段と、
前記目標空気量に従って空気量制御用のアクチュエータを操作する空気量制御手段と、
前記目標過給圧に従って過給圧制御用のアクチュエータを操作する過給圧制御手段と、を備え、
前記目標トルク決定手段は、運転者から要求されるトルクをベースにして常時設定する低周波トルク成分と特定の車両制御のために必要に応じて設定する高周波トルク成分とによって前記目標トルクを構成し、
前記目標過給圧決定手段は、前記目標トルクが前記低周波トルク成分のみ含む場合は、前記低周波トルク成分に対応する圧力成分によって前記目標過給圧を構成し、前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合は、前記低周波トルク成分に対応する圧力成分と前記高周波トルク成分の最大振幅以上の固定トルク成分に対応する圧力成分とによって前記目標過給圧を構成する
ことを特徴とする過給機付き内燃機関の制御装置。 - 前記目標過給圧決定手段は、
前記目標トルクが前記低周波トルク成分のみ含む場合に、前記低周波トルク成分を過給圧決定用トルクとして決定する手段と、
前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合に、前記高周波トルク成分をその最大振幅以上の固定トルク成分に変換し、前記低周波トルク成分に前記固定トルク成分を足し合わせて得られるトルクを過給圧決定用トルクとして決定する手段と、
前記過給圧決定用トルクを所定の変換規則に従って過給圧に変換し、変換で得られた過給圧を前記目標過給圧として決定する手段と、
を備えることを特徴とする請求項1に記載の過給機付き内燃機関の制御装置。 - 前記目標過給圧決定手段は、
前記目標トルクを所定の変換規則に従って過給圧(以下、過給圧変換値)に変換する手段と、
前記目標トルクが前記低周波トルク成分のみ含む場合に、前記過給圧変換値を前記目標過給圧として決定する手段と、
前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合に、前記高周波トルク成分に対応する前記過給圧変換値の高周波圧力成分をその最大振幅以上の固定圧力成分に変換し、前記低周波トルク成分に対応する前記過給圧変換値の低周波圧力成分に前記固定圧力成分を足し合わせて得られる圧力値を前記目標過給圧として決定する手段と、
を備えることを特徴とする請求項1に記載の過給機付き内燃機関の制御装置。 - 過給機付き内燃機関に出力させる目標トルクを決定する目標トルク決定手段と、
前記目標トルクから目標空気量を決定する目標空気量決定手段と、
前記目標トルクから目標過給圧を決定する目標過給圧決定手段と、
前記目標空気量に従って空気量制御用のアクチュエータを操作する空気量制御手段と、
前記目標過給圧に従って過給圧制御用のアクチュエータを操作する過給圧制御手段と、を備え、
前記目標トルク決定手段は、運転者から要求されるトルクをベースにして常時設定する低周波トルク成分と特定の車両制御のために必要に応じて設定する高周波トルク成分とによって前記目標トルクを構成し、
前記目標過給圧決定手段は、前記目標トルクが前記低周波トルク成分のみ含む場合は、前記低周波トルク成分に対応する圧力成分によって前記目標過給圧を構成し、前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合は、前記低周波トルク成分に対応する圧力成分と前記高周波トルク成分を時間軸方向に遅らせたものに対応する圧力成分とによって前記目標過給圧を構成し、
前記目標過給圧決定手段は、前記高周波トルク成分を遅らせる遅延時間と前記過給圧制御用アクチュエータの操作に対する実際の過給圧の応答遅れ時間との合計時間が前記高周波トルク成分の周期の整数倍になるように前記遅延時間を設定することを特徴とする過給機付き内燃機関の制御装置。 - 前記目標過給圧決定手段は、
前記目標トルクが前記低周波トルク成分のみ含む場合に、前記低周波トルク成分を過給圧決定用トルクとして決定する手段と、
前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合に、前記高周波トルク成分を前記遅延時間分だけ遅らせ、前記低周波トルク成分に前記遅らされた高周波トルク成分を足し合わせて得られるトルクを過給圧決定用トルクとして決定する手段と、
前記過給圧決定用トルクを所定の変換規則に従って過給圧に変換し、変換で得られた過給圧を前記目標過給圧として決定する手段と、
を備えることを特徴とする請求項4に記載の過給機付き内燃機関の制御装置。 - 前記目標過給圧決定手段は、
前記目標トルクを所定の変換規則に従って過給圧(以下、過給圧変換値)に変換する手段と、
前記目標トルクが前記低周波トルク成分のみ含む場合に、前記過給圧変換値を前記目標過給圧として決定する手段と、
前記目標トルクが前記低周波トルク成分と前記高周波トルク成分とを含む場合に、前記高周波トルク成分に対応する前記過給圧変換値の高周波圧力成分を前記遅延時間分だけ遅らせ、前記低周波トルク成分に対応する前記過給圧変換値の低周波圧力成分に前記遅らされた高周波圧力成分を足し合わせて得られる圧力値を前記目標過給圧として決定する手段と、
を備えることを特徴とする請求項4に記載の過給機付き内燃機関の制御装置。 - 前記目標過給圧決定手段は、
前記高周波圧力成分の周波数が前記過給圧制御用アクチュエータによって実現可能な周波数かどうか判定する手段と、
前記高周波圧力成分の周波数が実現可能な周波数を超えている場合には、前記高周波圧力成分をその最大振幅以上の固定圧力成分に変換し、前記低周波圧力成分に前記固定圧力成分を足し合わせて得られる圧力値を前記目標過給圧として決定する手段と、
をさらに備えることを特徴とする請求項6に記載の過給機付き内燃機関の制御装置。
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PCT/JP2011/050538 WO2012095988A1 (ja) | 2011-01-14 | 2011-01-14 | 過給機付き内燃機関の制御装置 |
JP2012530005A JP5263455B2 (ja) | 2011-01-14 | 2011-01-14 | 過給機付き内燃機関の制御装置 |
CN201180064826.9A CN103299044B (zh) | 2011-01-14 | 2011-01-14 | 带增压器的内燃机的控制装置 |
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Also Published As
Publication number | Publication date |
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CN103299044B (zh) | 2015-11-25 |
US8666636B2 (en) | 2014-03-04 |
US20130282259A1 (en) | 2013-10-24 |
CN103299044A (zh) | 2013-09-11 |
DE112011104717B4 (de) | 2015-01-22 |
JPWO2012095988A1 (ja) | 2014-06-09 |
DE112011104717T5 (de) | 2013-10-10 |
JP5263455B2 (ja) | 2013-08-14 |
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