WO2023199532A1 - 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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- WO2023199532A1 WO2023199532A1 PCT/JP2022/025316 JP2022025316W WO2023199532A1 WO 2023199532 A1 WO2023199532 A1 WO 2023199532A1 JP 2022025316 W JP2022025316 W JP 2022025316W WO 2023199532 A1 WO2023199532 A1 WO 2023199532A1
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- angle
- angular
- interval
- angular velocity
- ideal
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Classifications
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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
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
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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
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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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
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
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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
Definitions
- the present application relates to a control device for an internal combustion engine.
- Patent Document 1 calculates the crank angular velocity and crank angular acceleration based on the output signal of the crank angle sensor, calculates the gas pressure torque generated by combustion based on the crank angular velocity and the crank angular acceleration, and calculates the gas pressure. It is configured to calculate the amount of work due to torque.
- Patent Document 2 detects the instantaneous rotational speed of the crankshaft based on the output signal of the crank angle sensor, calculates the measurement parameter based on the instantaneous rotational speed, and calculates the ideal parameter corresponding to the average speed of the instantaneous rotational speed.
- the measurement parameter is acquired from the storage means and is configured to learn the error of the measured parameter with respect to the ideal parameter.
- Patent Document 1 does not disclose a specific method for dealing with this detection error. Therefore, in the technique of Patent Document 1, there is a risk that the accuracy of control performed based on the crank angular velocity and crank angular acceleration may deteriorate.
- an object of the present application is to provide a control device for an internal combustion engine that can accurately correct the crank angle detection error.
- a control device for an internal combustion engine includes a plurality of detected parts provided at a plurality of predetermined crank angles on a rotating member that rotates integrally with a crankshaft, and a plurality of detected parts fixed to a non-rotating member.
- An internal combustion engine control device that controls an internal combustion engine, comprising a specific crank angle sensor that detects gas pressure in an intake pipe, and a gas pressure sensor that detects gas pressure in an intake pipe. Based on the output signal of the specific crank angle sensor, detect the crank angle and detect the detection time at which the crank angle was detected, and based on the detected angle that is the detected crank angle, determine the angle between the detected angles.
- an angle information detection unit that calculates an angular interval corresponding to the section, and calculates a time interval corresponding to the angular section based on the detection time; an angle information correction unit that corrects the angular interval or the time interval of each of the angular intervals using a correction value provided one by one corresponding to each of the angular intervals; an intake pipe gas pressure detection unit that detects gas pressure in the intake pipe based on an output signal of the gas pressure sensor; Based on the detected value of the gas pressure in the intake pipe and the detected angle, the axial torque of the crankshaft due to the gas pressure in the cylinder and the reciprocating motion of the piston is calculated for each of the angle sections using a physical model equation of the crank mechanism.
- a shaft torque estimator that estimates in accordance with the In an ideal state assuming that there is no variation in the plurality of crank angles at which the plurality of detected parts are arranged, based on the estimated value of the shaft torque of each of the angle sections and the moment of inertia of the crankshaft system, an ideal angular velocity calculation unit that calculates an ideal section angular velocity that is an angular velocity corresponding to each of the angular sections; For each of the angular intervals, the detection interval angular velocity, which is the angular velocity corresponding to the angular interval calculated by the time interval and the angular interval after correction processing using the correction value, approaches the ideal interval angular velocity; and a correction value changing unit that changes the correction value for each of the angle sections.
- the estimated value of the shaft torque is calculated using a physical model equation of the crank mechanism. Becomes shaft torque. Since the ideal section angular velocity is calculated based on the estimated value of the shaft torque, it becomes the section angular velocity in the ideal state. Therefore, by changing the correction value for each angle section so that the detection section angular velocity approaches the ideal section angular velocity, it is possible to appropriately change the correction value so as to cancel out the variation in the crank angle at which the detected part is arranged. This makes it possible to accurately correct crank angle detection errors.
- FIG. 1 is a schematic configuration diagram of an internal combustion engine and a control device according to Embodiment 1.
- FIG. 1 is a schematic configuration diagram of an internal combustion engine and a control device according to Embodiment 1.
- FIG. 1 is a block diagram of a control device according to Embodiment 1.
- FIG. 1 is a hardware configuration diagram of a control device according to Embodiment 1.
- FIG. 5 is a time chart for explaining angle information detection processing according to Embodiment 1.
- FIG. 3 is a diagram for explaining correction values stored in a storage device according to the first embodiment. 7 is a time chart for explaining calculation processing of crank acceleration and angular acceleration according to the first embodiment.
- FIG. 3 is a diagram for explaining a change in crank angular velocity when the correction process according to the first embodiment is not performed.
- FIG. 3 is a diagram for explaining a change in crank angular velocity when the correction process according to the first embodiment is not performed.
- FIG. 3 is a diagram for explaining processing of a one-rotation time detection section and an ideal angular velocity calculation section according to the first embodiment.
- FIG. 6 is a diagram for explaining the behavior of the crank angular velocity when the correction process according to the first embodiment is not performed.
- FIG. 6 is a diagram for explaining the behavior of the crank angular velocity when performing the correction process according to the first embodiment.
- FIG. 3 is a diagram for explaining a change in crank angular velocity when performing correction processing according to the first embodiment.
- FIG. 7 is a diagram for explaining processing of a one-rotation time detection section and an ideal angular velocity calculation section according to the second embodiment.
- FIG. 7 is a diagram for explaining processing of a one-rotation time detection section and a correction value changing section according to Embodiment 3;
- Embodiment 1 A control device 50 (hereinafter simply referred to as control device 50) for the internal combustion engine 1 according to Embodiment 1 will be described with reference to the drawings.
- 1 and 2 are schematic configuration diagrams of an internal combustion engine 1 and a control device 50 according to the present embodiment
- FIG. 3 is a block diagram of the control device 50 according to the present embodiment.
- the internal combustion engine 1 and the control device 50 are mounted on a vehicle, and the internal combustion engine 1 serves as a driving force source for the vehicle (wheels).
- the internal combustion engine 1 includes a cylinder 7 that burns a mixture of air and fuel.
- the internal combustion engine 1 includes an intake pipe 23 that supplies air to the cylinder 7 and an exhaust pipe 17 that discharges exhaust gas burned in the cylinder 7.
- the internal combustion engine 1 is a gasoline engine.
- the internal combustion engine 1 includes a throttle valve 4 that opens and closes an intake pipe 23.
- the throttle valve 4 is an electronically controlled throttle valve that is driven to open and close by an electric motor controlled by a control device 50.
- the throttle valve 4 is provided with a throttle opening sensor 19 that outputs an electrical signal according to the opening of the throttle valve 4 .
- An air flow sensor 3 is provided in the intake pipe 23 on the upstream side of the throttle valve 4 and outputs an electrical signal according to the amount of intake air taken into the intake pipe 23.
- the internal combustion engine 1 includes an exhaust gas recirculation device 20 .
- the exhaust gas recirculation device 20 includes an EGR flow path 21 that recirculates exhaust gas from the exhaust pipe 17 to the intake manifold 12, and an EGR valve 22 that opens and closes the EGR flow path 21.
- the intake manifold 12 is a portion of the intake pipe 23 on the downstream side of the throttle valve 4.
- the EGR valve 22 is an electronically controlled EGR valve that is driven to open and close by an electric motor controlled by the control device 50.
- the exhaust pipe 17 is equipped with an air-fuel ratio sensor 18 that outputs an electrical signal according to the air-fuel ratio of exhaust gas within the exhaust pipe 17.
- the intake manifold 12 is provided with a gas pressure sensor 8 that outputs an electrical signal according to the pressure inside the intake manifold 12.
- An injector 13 that injects fuel is provided on the downstream side of the intake manifold 12. Note that the injector 13 may be provided to inject fuel directly into the cylinder 7.
- the internal combustion engine 1 is provided with an atmospheric pressure sensor 33 that outputs an electrical signal according to atmospheric pressure.
- an ignition plug that ignites a mixture of air and fuel, and an ignition coil 16 that supplies ignition energy to the ignition plug.
- an intake valve 14 that adjusts the amount of intake air sucked into the cylinder 7 from the intake pipe 23, and an exhaust valve 15 that adjusts the amount of exhaust gas discharged from the inside of the cylinder to the exhaust pipe 17. and are provided.
- the intake valve 14 is provided with an intake variable valve timing mechanism that changes the valve opening/closing timing.
- the exhaust valve 15 is provided with an exhaust variable valve timing mechanism that makes the valve opening/closing timing variable.
- the variable valve timing mechanisms 14 and 15 have electric actuators.
- the internal combustion engine 1 includes a plurality of cylinders 7 (three in this example).
- a piston 5 is provided within each cylinder 7.
- the piston 5 of each cylinder 7 is connected to the crankshaft 2 via a connecting rod 9 and a crank 32.
- the crankshaft 2 is rotationally driven by the reciprocating movement of the piston 5.
- the combustion gas pressure generated in each cylinder 7 presses the top surface of the piston 5 and rotates the crankshaft 2 via the connecting rod 9 and the crank 32.
- the crankshaft 2 is connected to a power transmission mechanism that transmits driving force to the wheels.
- the power transmission mechanism includes a transmission, a differential gear, and the like.
- the vehicle equipped with the internal combustion engine 1 may be a hybrid vehicle equipped with a motor generator within the power transmission mechanism.
- the internal combustion engine 1 includes a signal plate 10 that rotates integrally with the crankshaft 2.
- the signal plate 10 is provided with a plurality of teeth at a plurality of predetermined crank angles.
- the signal plate 10 has teeth arranged at intervals of 10 degrees.
- the teeth of the signal plate 10 are provided with missing teeth where some teeth are missing.
- the internal combustion engine 1 is fixed to the engine block 24 and includes a first crank angle sensor 11 that detects the teeth of the signal plate 10 .
- the internal combustion engine 1 includes a camshaft 29 connected to the crankshaft 2 by a chain 28.
- the camshaft 29 drives the intake valve 14 and the exhaust valve 15 to open and close.
- the camshaft 29 rotates once while the crankshaft 2 rotates twice.
- the internal combustion engine 1 includes a cam signal plate 31 that rotates integrally with the camshaft 29 .
- the cam signal plate 31 is provided with a plurality of teeth at a plurality of predetermined camshaft angles.
- the internal combustion engine 1 is fixed to the engine block 24 and includes a cam angle sensor 30 that detects the teeth of a signal plate 31 for the cam.
- the control device 50 detects the crank angle with respect to the top dead center of each piston 5 based on two types of output signals from the first crank angle sensor 11 and the cam angle sensor 30, and also controls the stroke of each cylinder 7. Discern.
- the internal combustion engine 1 is a four-stroke engine having an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke.
- the internal combustion engine 1 includes a flywheel 27 that rotates integrally with the crankshaft 2.
- the outer peripheral portion of the flywheel 27 is a ring gear 25, and the ring gear 25 is provided with a plurality of teeth at a plurality of predetermined crank angles.
- the teeth of the ring gear 25 are provided at equal angular intervals in the circumferential direction. In this example, 60 teeth are provided at intervals of 6 degrees.
- the teeth of the ring gear 25 are not provided with any missing teeth.
- the internal combustion engine 1 is fixed to an engine block 24 and includes a second crank angle sensor 6 that detects teeth of a ring gear 25.
- the second crank angle sensor 6 is disposed on the outside of the ring gear 25 in the radial direction, facing the ring gear 25 with a space therebetween.
- the opposite side of the flywheel 27 from the crankshaft 2 is connected to a power transmission mechanism. Therefore, the output torque of the internal combustion engine 1 is transmitted to the wheels through the flywheel 27.
- the first crank angle sensor 11, the cam angle sensor 30, and the second crank angle sensor 6 output electrical signals according to changes in the distance between each sensor and the teeth due to the rotation of the crankshaft 2.
- the output signals of the respective angle sensors 11, 30, and 6 are rectangular waves that turn on and off depending on whether the distance between the sensor and the tooth is close or far.
- an electromagnetic pickup type sensor is used, for example.
- the flywheel 27 (ring gear 25) has more teeth than the signal plate 10 and has no missing teeth, so high-resolution angle detection can be expected. Further, the flywheel 27 has a mass larger than the mass of the signal plate 10, and high frequency vibrations are suppressed, so that highly accurate angle detection can be expected.
- the second crank angle sensor 6 corresponds to a "specific crank angle sensor” in the present application
- the flywheel 27 corresponds to a “rotating member” in the present application
- a ring gear provided on the flywheel 27 corresponds to a “rotating member” in the present application
- the tooth 25 corresponds to the "detected part” in the present application
- the engine block 24 corresponds to the "non-rotating member” in the present application.
- the control device 50 is a control device that controls the internal combustion engine 1.
- the control device 50 includes an intake pipe gas pressure detection section 51, an angle information detection section 52, an angle information correction section 53, a shaft torque estimation section 54, an ideal angular velocity calculation section 55, a correction value change section 56, and a control section such as a one-rotation time detection section 57.
- Each of the control units 51 to 57 of the control device 50 is realized by a processing circuit included in the control device 50. Specifically, as shown in FIG.
- the control device 50 includes a processing circuit such as an arithmetic processing device 90 (computer) such as a CPU (Central Processing Unit), and a processing circuit connected to the arithmetic processing device 90 via a signal line such as a bus. It includes a connected storage device 91, an input circuit 92 that inputs external signals to the arithmetic processing device 90, an output circuit 93 that outputs signals from the arithmetic processing device 90 to the outside, and the like.
- a processing circuit such as an arithmetic processing device 90 (computer) such as a CPU (Central Processing Unit)
- a processing circuit connected to the arithmetic processing device 90 via a signal line such as a bus. It includes a connected storage device 91, an input circuit 92 that inputs external signals to the arithmetic processing device 90, an output circuit 93 that outputs signals from the arithmetic processing device 90 to the outside, and the like.
- the arithmetic processing unit 90 includes an ASIC (Application Specific Integrated Circuit), an IC (Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), various logic circuits, and various signal processing circuits. It's okay. Further, a plurality of arithmetic processing units 90 of the same type or different types may be provided, and each process may be shared and executed.
- ASIC Application Specific Integrated Circuit
- IC Integrated Circuit
- DSP Digital Signal Processor
- FPGA Field Programmable Gate Array
- the storage device 91 includes volatile and nonvolatile storage devices such as RAM (Random Access Memory), ROM (Read Only Memory), and EEPROM (Electrically Erasable Programmable ROM).
- the input circuit 92 is connected to various sensors and switches, and includes an A/D converter and the like for inputting output signals of these sensors and switches to the arithmetic processing device 90.
- the output circuit 93 is connected to electrical loads and includes a drive circuit and the like for outputting control signals from the arithmetic processing device 90 to these electrical loads.
- control units 51 to 57 of the control device 50 are executed by the arithmetic processing unit 90 executing software (programs) stored in the storage device 91 such as ROM and EEPROM, and the storage device 91 and the input This is realized by cooperating with other hardware of the control device 50 such as the circuit 92 and the output circuit 93.
- setting data such as the moment of inertia Icrk and the determination value used by each of the control units 51 to 57 and the like is stored in a storage device 91 such as a ROM or an EEPROM.
- the data such as the correction value Kc, the angular interval ⁇ d, the time interval ⁇ Td, each calculated value, and each detected value calculated by each control unit 51 to 57 etc. are stored in a rewritable storage device 91 such as a RAM. .
- the input circuit 92 includes the first crank angle sensor 11, the cam angle sensor 30, the second crank angle sensor 6, the air flow sensor 3, the throttle opening sensor 19, the gas pressure sensor 8, and the atmospheric pressure sensor 33. , an air-fuel ratio sensor 18, an accelerator position sensor 26, and the like are connected.
- the output circuit 93 is connected to the throttle valve 4 (electric motor), the EGR valve 22 (electric motor), the injector 13, the ignition coil 16, the intake variable valve timing mechanism 14, the exhaust variable valve timing mechanism 15, and the like.
- various sensors, switches, actuators, etc. (not shown) are connected to the control device 50.
- the control device 50 detects operating conditions of the internal combustion engine 1 such as intake air amount, pressure in the intake manifold, atmospheric pressure, air-fuel ratio, and accelerator opening based on output signals from various sensors.
- the control device 50 calculates the fuel injection amount, ignition timing, etc. based on input output signals of various sensors, etc., and drives and controls the injector 13, ignition coil 16, etc.
- the control device 50 calculates the output torque of the internal combustion engine 1 requested by the driver based on the output signal of the accelerator position sensor 26, etc., and adjusts the throttle so that the amount of intake air achieves the requested output torque.
- Controls valve 4 etc. Specifically, the control device 50 calculates a target throttle opening, and controls the electric motor of the throttle valve 4 so that the throttle opening detected based on the output signal of the throttle opening sensor 19 approaches the target throttle opening. to drive and control.
- control device 50 calculates a target opening degree of the EGR valve 22 based on input output signals of various sensors, etc., and drives and controls the electric motor of the EGR valve 22.
- the control device 50 calculates the target opening/closing timing of the intake valve and the target opening/closing timing of the exhaust valve based on the input output signals of various sensors, etc., and adjusts the intake and exhaust variable valve timing mechanism based on each target opening/closing timing. 14 and 15 are driven and controlled.
- the intake pipe gas pressure detection unit 51 detects the gas pressure Pind in the intake pipe based on the output signal of the gas pressure sensor 8. Gas pressure Pind in the intake pipe is detected at every predetermined detection period.
- the angle information detection unit 52 detects the crank angle ⁇ d based on the output signal of the second crank angle sensor 6, which is a specific crank angle sensor, and also detects the detection time Td at which the crank angle ⁇ d is detected. To detect. Then, the angle information detection unit 52 calculates an angular interval ⁇ d corresponding to an angular interval Sd between the detected angles ⁇ d based on the detected angle ⁇ d, which is the detected crank angle, and calculates an angular interval ⁇ d corresponding to the angular interval Sd between the detected angles ⁇ d. A time interval ⁇ Td corresponding to Sd is calculated.
- the angle information detection unit 52 is configured to determine the crank angle ⁇ d when the falling edge (or rising edge) of the output signal (rectangular wave) of the second crank angle sensor 6 is detected. ing.
- the angle information detection unit 52 determines a base falling edge that is a falling edge corresponding to a base angle (for example, 0 degrees, which is the top dead center of the piston 5 of the first cylinder 7), and sets the base falling edge as the base point.
- the crank angle ⁇ d corresponding to the number n of the falling edge counted up (hereinafter referred to as angle identification number n) is determined.
- the angle information detection unit 52 when the angle information detection unit 52 detects the base falling edge, it sets the crank angle ⁇ d to the base angle (for example, 0 degrees) and sets the angle identification number n to 1. Then, each time the angle information detection unit 52 detects a falling edge, it increases the crank angle ⁇ d by a preset angular interval ⁇ d (6 degrees in this example) and increases the angle identification number n by 1.
- the angle information detection unit 52 may be configured to read the crank angle ⁇ d corresponding to the current angle identification number n using an angle table in which the relationship between the angle identification number n and the crank angle ⁇ d is set in advance. good.
- the angle information detection unit 52 associates the crank angle ⁇ d (detected angle ⁇ d) with the angle identification number n.
- the detection time Td and the detection angle ⁇ d may be used that complement the missing tooth part with information before and after the missing tooth part, or the detection time Td and the detection angle ⁇ d that do not complement the missing tooth part may be used. It may be used as is. If the missing tooth portion is not complemented, the angular interval ⁇ d corresponding to the missing tooth portion is used in each calculation.
- the angle information detection unit 52 determines the base point of the second crank angle sensor 6 by referring to a reference crank angle ⁇ r detected based on the first crank angle sensor 11 and the cam angle sensor 30, which will be described later. Determine the falling edge. For example, the angle information detection unit 52 determines the falling edge whose reference crank angle ⁇ r is closest to the base angle when the falling edge of the second crank angle sensor 6 is detected to be the base falling edge.
- the angle information detection unit 52 refers to the stroke of each cylinder 7 determined based on the first crank angle sensor 11 and the cam angle sensor 30, and determines the stroke of each cylinder 7 corresponding to the crank angle ⁇ d.
- the angle information detection unit 52 detects the detection time Td when the falling edge of the output signal (rectangular wave) of the second crank angle sensor 6 is detected, and associates the detection time Td with the angle identification number n. Specifically, the angle information detection unit 52 detects the detection time Td using a timer function included in the arithmetic processing device 90.
- the angle information detection unit 52 when the angle information detection unit 52 detects a falling edge, it calculates the detected angle ⁇ d(n) corresponding to the current angle identification number (n) and the previous angle identification number (n-1). ) is set as the angle interval Sd(n) corresponding to the current angle identification number (n).
- the angle information detection unit 52 when the angle information detection unit 52 detects a falling edge, it detects the detected angle ⁇ d(n) corresponding to the current angle identification number (n) and the previous angle identification number. The deviation from the detected angle ⁇ d(n-1) corresponding to (n-1) is calculated, and the angle interval ⁇ d(n ). In this embodiment, the angular intervals between the teeth of the ring gear 25 are all equal, so the angle information detection unit 52 calculates the angular intervals ⁇ d of all the angle identification numbers n by a preset angle (in this example). Then set it to 6 degrees).
- the angle information detection unit 52 detects the detection time Td(n) corresponding to the current angle identification number (n) and the previous angle identification number.
- the deviation from the detection time Td(n-1) corresponding to (n-1) is calculated and the time interval ⁇ Td(n) corresponding to the current angle identification number (n) (current angle section Sd(n)) is calculated. ).
- the angle information detection unit 52 detects a reference crank angle ⁇ r based on the top dead center of the piston 5 of the first cylinder 7 based on two types of output signals from the first crank angle sensor 11 and the cam angle sensor 30. At the same time, the stroke of each cylinder 7 is determined. For example, the angle information detection unit 52 determines the falling edge immediately after the missing tooth portion of the signal plate 10 from the time interval between the falling edges of the output signal (rectangular wave) of the first crank angle sensor 11. Then, the angle information detection unit 52 determines the correspondence between each falling edge based on the falling edge immediately after the missing tooth portion and the reference crank angle ⁇ r based on the top dead center, and determines the correspondence between each falling edge and the reference crank angle ⁇ r based on the top dead center.
- a reference crank angle ⁇ r with respect to the top dead center at the time when is detected is calculated. Further, the angle information detection unit 52 determines the position of the missing tooth portion in the output signal (rectangular wave) of the first crank angle sensor 11 and the relationship between the output signal (rectangular wave) of the cam angle sensor 30 and the output signal (rectangular wave) of each cylinder 7. Determine the journey.
- the angle information correction unit 53 corrects each angular interval ⁇ d or time interval ⁇ Td of the angular interval Sd using a correction value Kc provided one by one corresponding to each angular interval Sd.
- the angle information correction unit 53 provides one correction value Kc(n) for each angle section Sd(n) of each angle identification number n.
- each correction value Kc is stored in a rewritable storage device 91 such as a RAM of the control device 50 in association with each angle identification number n.
- the angle information correction unit 53 sets a correction value corresponding to the current angle identification number (n) at the time interval ⁇ Td(n) corresponding to the current angle identification number (n). By multiplying by Kc(n), a corrected time interval ⁇ Tdc(n) corresponding to the current angle identification number (n) is calculated. Alternatively, the angle information correction unit 53 divides the angular interval ⁇ d(n) corresponding to the current angle identification number (n) by the correction value Kc(n) corresponding to the current angle identification number (n), A corrected angular interval ⁇ dc(n) corresponding to the current angle identification number (n) is calculated.
- the angle information correction unit 53 is configured to correct the crank angular velocity ⁇ d(n) calculated from the angular interval ⁇ d(n) and time interval ⁇ Td(n) before correction, using the correction value Kc(n). Good too.
- the time interval ⁇ Td is corrected using the correction value Kc.
- the angular interval ⁇ d that has not been corrected by the correction value Kc will also be referred to as the angular interval ⁇ dc after the correction process.
- crank angular velocity ⁇ d which is the time rate of change of the crank angle ⁇ d, corresponding to each of the detected angle ⁇ d or the angle section Sd, based on the angle interval ⁇ dc and time interval ⁇ Tdc after the correction process using the correction value Kc.
- crank angular acceleration ⁇ d which is the time rate of change of the crank angular velocity ⁇ d.
- the angle information detection unit 52 calculates the angle interval ⁇ dc(n) and time interval ⁇ Tdc(n) after the correction process corresponding to the angle section Sd(n) to be processed. Based on this, the crank angular velocity ⁇ d(n) corresponding to the angular section Sd(n) to be processed is calculated. Specifically, as shown in equation (4), the angle information detection unit 52 calculates the angular interval ⁇ dc(n) after the correction process corresponding to the angle interval Sd(n) to be processed based on the time after the correction process. The crank angular velocity ⁇ d(n) is calculated by dividing by the interval ⁇ Tdc(n).
- the angle information detection unit 52 calculates the crank angular velocity ⁇ d(n) corresponding to one angle section Sd(n) immediately before the detected angle ⁇ d(n) to be processed, the time interval ⁇ Tdc(n) after correction processing, and the processing Based on the crank angular velocity ⁇ d(n+1) corresponding to one angle section Sd(n+1) immediately after the detected angle ⁇ d(n) of the target and the time interval ⁇ Tdc(n+1) after correction processing, the detected angle ⁇ d(n) of the target to be processed is calculated. ) is calculated.
- the angle information detection unit 52 subtracts the immediately preceding crank angular velocity ⁇ d(n) from the immediately subsequent crank angular velocity ⁇ d(n+1), and calculates the subtracted value after the immediately subsequent correction process.
- the crank angular acceleration ⁇ d(n) is calculated by dividing the time interval ⁇ Tdc(n+1) by the average value of the immediately preceding correction processing time interval ⁇ Tdc(n).
- crank angular velocity ⁇ d(n) and the crank angular acceleration ⁇ d(n) are used for controlling various known internal combustion engines, such as estimating the combustion state.
- FIG. 8 shows the crank angular velocity ⁇ dcmp without correction processing calculated based on the angular interval ⁇ d and the time interval ⁇ Td that have not been corrected by the correction value Kc when a change occurs in the tooth arrangement crank angle, and the crank angular velocity ⁇ dcmp for measurement.
- the behavior with the highly accurate crank angular velocity ⁇ * detected by the provided highly accurate rotation sensor is shown.
- the crank angular velocity ⁇ dcmp without correction processing varies with respect to the highly accurate crank angular velocity ⁇ * for measurement.
- FIG. 9 shows the angular velocity ratio obtained by dividing the crank angular velocity ⁇ dcmp without correction processing by the highly accurate crank angular velocity ⁇ * for measurement at each crank angle. If the angular velocity ratio is greater than 1, the actual angular interval is shorter than the specified angular interval (6 degrees), and if it is smaller than 1, the actual angular interval is shorter than the specified angular interval (6 degrees). degree). Therefore, unless the correction value Kc is appropriately changed and corrected by the correction value Kc so as to cancel out the variation in the tooth arrangement crank angle, a high frequency component will be superimposed on the calculated crank angular velocity ⁇ d and crank angular acceleration ⁇ d. The accuracy of combustion state estimation and control of the internal combustion engine, such as combustion control, deteriorates. Below, processing for appropriately changing the correction value Kc will be explained.
- the shaft torque estimation unit 54 uses a physical model equation of the crank mechanism to estimate the shaft torque of the crankshaft due to the gas pressure in the cylinder and the reciprocating motion of the piston, based on the detected value Pind of the gas pressure in the intake pipe and the detected angle ⁇ d. Tcrke(n) is estimated corresponding to each angle interval Sd(n).
- the shaft torque estimating unit 54 calculates the gas pressure torque Tgas generated by the gas pressure Pcyl in the cylinder and the inertia torque Tin generated by the reciprocating motion of the piston, and calculates the gas pressure torque Tgas generated by the gas pressure Pcyl in the cylinder.
- the estimated value Tcrke of the shaft torque is calculated by summing Tgas and the inertia torque Tin.
- the shaft torque estimating unit 54 uses a physical model formula to calculate the gas pressure torque caused by the gas pressure in the cylinder, and calculates the gas pressure torque caused by the gas pressure Pcyl in the cylinder based on the detected value Pind of the gas pressure in the intake pipe. Calculate Tgas.
- the shaft torque estimation unit 54 calculates the gas pressure torque Tgas generated by the gas pressure in the cylinder when it is assumed that the internal combustion engine is in an unburned state where no combustion is performed.
- the shaft torque estimation unit 54 calculates the gas pressure in the intake pipe using a formula that calculates the gas pressure by polytropic change for the cylinder i in which the intake valve and the exhaust valve are closed. Based on the detected value Pind and the crank angle ⁇ d, the gas pressure Pcyl_i in the cylinder is calculated. For a cylinder i in which the intake valve is open and the exhaust valve is closed, the shaft torque estimation unit 54 calculates the gas pressure Pcyl_i in the cylinder based on the detected value Pind of the gas pressure in the intake pipe. For the cylinder i whose exhaust valve is open, the gas pressure Pcyl_i in the cylinder is calculated based on the gas pressure Pex in the exhaust pipe.
- Nply is a polytropic index, and a preset value is used.
- Vcyl0 is the cylinder volume when the intake valve is closed, and may be a preset value or may be changed according to the intake valve closing timing by the intake variable valve timing mechanism 14.
- Vcly_ ⁇ _i is the cylinder volume of each cylinder i at the crank angle ⁇ d_i of each cylinder i.
- Sp is the projected area of the top surface of the piston
- r is the crank length
- L is the connecting rod length. Note that for the crank angle ⁇ d_i of each cylinder i used in the calculation of trigonometric functions, the crank angle ⁇ d is shifted so that the top dead center of the compression stroke is 0 degrees for each cylinder i. .
- a value after an averaging process such as an average value of stroke cycles may be used, or a detected value when the intake valve is closed may be used.
- a detected value of the intake valve is closed may be used.
- a detected value of atmospheric pressure may be used, or a predetermined value may be used.
- the shaft torque estimation unit 54 calculates the gas pressure torque Tgas based on the in-cylinder gas pressure Pcyl_i of each cylinder i and the crank angle ⁇ d_i using the following equation for converting gas pressure into torque.
- Pcase is the internal pressure in the crankcase (back pressure of the piston), and may be set to a predetermined value or may be changed depending on the detected value Pind of gas pressure in the intake pipe, atmospheric pressure, etc. good.
- R_i is a conversion coefficient that converts the force generated in the piston of each cylinder i into torque around the crankshaft. Note that in the case of an offset crank, the offset may be taken into consideration when calculating the conversion coefficient R_i.
- the shaft torque estimation unit 54 calculates the inertia torque Tin generated by the reciprocating motion of the piston based on the crank angular velocity ⁇ d using a physical model equation that calculates the inertia torque generated by the reciprocating motion of the piston at each crank angle ⁇ d.
- the shaft torque estimating unit 54 calculates the inertia torque Tin generated by the reciprocating motion of the piston of each cylinder i based on the crank angular velocity ⁇ d and the crank angle ⁇ d using the following equation for converting the acceleration of the piston and the inertial force of the piston into torque. Calculate.
- mp is the mass of the piston
- ⁇ p_i is the acceleration of the piston of each cylinder i at the crank angular velocity ⁇ d
- R_i is the conversion coefficient calculated by the second equation of equation (7). Note that inertia torque generated due to inertia of the connecting rod or the like may be added to the inertia torque Tin.
- the shaft torque estimation unit 54 calculates the estimated value Tcrke of the shaft torque at each crank angle ⁇ d by summing the gas pressure torque Tgas and inertia torque Tin calculated at each crank angle ⁇ d.
- the shaft torque estimation unit 54 calculates the estimated value Tcrke(n) of the shaft torque for each angle section Sd(n) based on the estimated value Tcrke of the shaft torque for each crank angle ⁇ d. For example, an estimated value Tcrke(n) of the shaft torque corresponding to the center position of each angular section Sd(n) is calculated.
- the shaft torque estimation unit 54 calculates the estimated value Tcrke( ⁇ d(n-1)) of the shaft torque at the starting crank angle ⁇ d(n-1) of each angle section Sd(n), and The average value of the estimated shaft torque Tcrke( ⁇ d(n)) of the end crank angle ⁇ d(n) of the section Sd(n) is set as the estimated shaft torque Tcrke(n) of each angle section Sd(n). calculate.
- the crank angle ⁇ d used to calculate the estimated value Tcrke of the shaft torque is set to the crank angle ⁇ d corresponding to the center position of each angle section Sd, and the estimated value of the shaft torque corresponding to the center position of each angle section Sd is set. Tcrke may be calculated directly.
- the external load torque Tload is calculated as described below, and the external load torque
- the estimated value Tcrke of the shaft torque is corrected by Tload.
- the external load torque Tload is a torque applied to the crankshaft from the outside of the internal combustion engine.
- the external load torque Tload includes running resistance and frictional resistance of the vehicle transmitted from a power transmission mechanism connected to the wheels to the internal combustion engine, and auxiliary machine loads such as an alternator connected to the crankshaft.
- the shaft torque estimation unit 54 calculates the detected value Tcrkd of the shaft torque of the crankshaft based on the detected value ⁇ d of the crank angular acceleration and the moment of inertia Icrk of the crankshaft system.
- the shaft torque estimation unit 54 calculates the detected value Tcrkd(n) of the shaft torque corresponding to each angle section Sd(n) using the following equation.
- the detected value ⁇ d(n) of the crank angular acceleration is the angular acceleration at the end crank angle ⁇ d(n) of each angle section Sd(n).
- crank angular acceleration ⁇ d(n) of the current crank angle ⁇ d(n) and the previous crank angle ⁇ d(n-1) are used.
- the average value of the crank angular acceleration ⁇ d(n-1) is used.
- the shaft torque estimation unit 54 calculates the external load torque Tload based on the estimated shaft torque value Tcrke ( ⁇ d_tdc) calculated at the crank angle ⁇ d_tdc near the top dead center of the piston and the detected shaft torque value Tcrkd ( ⁇ d_tdc). do. Near the top dead center, the connecting rod and the crank are in a straight line, and no shaft torque Tcrk is generated due to the force of the cylinder pressure pushing the piston. Therefore, in the vicinity of the top dead center, the external load torque Tload can be calculated with high accuracy based on the deviation between the detected value Tcrkd of the shaft torque and the estimated value Tcrke of the shaft torque.
- the external load torque Tload calculated near the top dead center can be used at each crank angle ⁇ d.
- the crank angle ⁇ d_tdc near the top dead center is preset to the crank angle near the top dead center.
- the vicinity of top dead center is within an angular range from 10 degrees before top dead center to 10 degrees after top dead center, for example.
- the crank angle ⁇ d near the top dead center is preset to the crank angle at the top dead center.
- the shaft torque estimation unit 54 calculates the external load torque Tload using the following equation.
- the shaft torque estimation unit 54 may calculate the external load torque Tload from the deviation between the average value of the detected shaft torque values Tcrkd after the averaging process and the average value of the estimated shaft torque values Tcrke.
- the shaft torque estimation unit 54 corrects the estimated value Tcrke(n) of the shaft torque in each angle section Sd(n) using the external load torque Tload.
- the shaft torque estimation unit 54 calculates the value obtained by adding the external load torque Tload to the estimated value Tcrke(n) of the shaft torque in each angle section Sd(n), as shown in the following equation, after correction. It is calculated as the estimated value Tcrke(n) of the shaft torque.
- the one-rotation time detection unit 57 detects the one-rotation time interval ⁇ T360, which is the time interval of the one-rotation angle interval S360 in which the crankshaft rotates once, based on the output signal of the second crank angle sensor 6, and detects the one-rotation time interval ⁇ T360. Based on the detected value ⁇ T360, the average detected angular velocity ⁇ saved, which is the average angular velocity of the average processing angle section Save set within the range of one rotation angle interval S360, is calculated.
- the one-rotation time detection unit 57 detects each of the first one-rotation angular interval S360_1 and the second one-rotation angular interval S360_2, which overlap each other and are shifted in angle. , detects the first one-rotation time interval ⁇ T360_1 and the second one-rotation time interval ⁇ T360_2, and determines the overlapping angular interval between the first one-rotation angular interval S360_1 and the second one-rotation angular interval S360_2. Set the average processing angle interval Save.
- the one-rotation time detection unit 57 calculates the time interval ⁇ Tsave of the average processing angle section based on the average value of the first one-rotation time interval ⁇ T360_1 and the second one-rotation time interval ⁇ T360_2, and calculates the time interval ⁇ Tsave of the average processing angle section.
- the average detected angular velocity ⁇ saved is calculated based on the time interval ⁇ Tsave.
- the average processing angle interval Save is set to 180 degrees.
- the first rotation angle interval S360_1 is set to an angle interval from an angle that is 180 degrees retarded than the start angle of the average processing angle interval Save to the end angle of the average processing angle interval Save.
- the second one-rotation angle interval S360_2 is set to an angle interval from the start angle of the average processing angle interval Save to an angle that is 180 degrees more advanced than the end angle of the average processing angle interval Save.
- the process of calculating the average detected angular velocity ⁇ saved is performed for each average processing angle section Save.
- the one-rotation time detection unit 57 calculates the average detected angular velocity ⁇ saved using the following equation.
- the average processing angle interval Save may be set to any angle within 360 degrees.
- the average processing angle interval Save may be set to 360 degrees, and in this case, the first one-rotation angular interval S360_1 and the second one-rotation angular interval S360_2 are the same, so one rotation
- the average detected angular velocity ⁇ saved may be calculated based on the one-rotation time interval ⁇ T360 of the angular interval S360.
- the ideal angular velocity calculation unit 55 calculates a plurality of crank angles ( An ideal section angular velocity ⁇ id, which is an angular velocity corresponding to each of the angular sections Sd, is calculated in an ideal state assuming that there is no variation in the tooth arrangement crank angle (hereinafter also referred to as the crank angle).
- the estimated value Tcrke of the shaft torque is calculated using a physical model equation of the crank mechanism, it is the shaft torque in an ideal state assuming that there is no variation in the tooth arrangement crank angle. Since the ideal section angular velocity ⁇ id is calculated based on the estimated value Tcrke of the shaft torque, it becomes the section angular velocity in the ideal state.
- the ideal angular velocity calculation unit 55 calculates each correction value of the angle interval Sd(n) so that the average value ⁇ sd_ave of the detected interval angular velocity ⁇ sd in the average processing angle interval Save does not deviate from the average detected angular velocity ⁇ saved.
- the average value ⁇ id_ave of the ideal interval angular velocity ⁇ id in the average processing angle interval Save is made to match the average detected angular velocity ⁇ saved.
- the ideal angular velocity calculation unit 55 calculates the angle interval Sd(n) based on the estimated value Tcrke(n) of the shaft torque of each angle interval Sd(n) and the moment of inertia Icrk of the crankshaft system. ), the ideal interval angular acceleration ⁇ id(n) is calculated, and the ideal interval angular acceleration ⁇ id(n) is integrated to calculate the ideal interval angular acceleration ⁇ id(n) corresponding to each of the angular intervals A tentative ideal interval angular velocity ⁇ idtmp(n), which is the angular velocity of the state, is calculated. In the present embodiment, the ideal angular velocity calculation unit 55 calculates the temporary ideal section angular velocity ⁇ idtmp using the following equation. This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the ideal angular velocity calculation unit 55 calculates the average value ⁇ idtmp_ave of the temporary ideal section angular velocity ⁇ idtmp in the average processing angle section Save.
- Q is an angle identification number corresponding to the first angle section of the average processing angle section Save
- R is an angle identification number corresponding to the last angle section of the average processing angle section Save.
- the ideal angular velocity calculation unit 55 subtracts the average value ⁇ idtmp_ave of the tentative ideal interval angular velocities from the tentative ideal interval angular velocity ⁇ idtmp, and calculates the value obtained by adding the average detected angular velocity ⁇ saved to the ideal interval angular velocity ⁇ idtmp. Calculate as ⁇ id. This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the average value ⁇ id_ave of the ideal interval angular velocity ⁇ id in the average processing angle interval Save can be made to match the average detected angular velocity ⁇ saved. Therefore, as will be described later, the correction value Kc is changed so that the detection interval angular velocity ⁇ sd approaches the ideal interval angular velocity ⁇ id, so the average value ⁇ sd_ave of the detection interval angular velocity ⁇ sd in the average processing angle interval Save becomes the average detected angular velocity ⁇ saved.
- the correction value Kc can be changed so as not to deviate from the above.
- FIG. 11 shows control behavior when the temporary ideal section angular velocity ⁇ idtmp is directly set to the ideal section angular velocity ⁇ id under the condition of a constant crank angular velocity.
- the average value ⁇ id_ave of the ideal section angular velocity ⁇ id deviates from the average detected angular velocity ⁇ saved
- the average value ⁇ sd_ave of the detected section angular velocity ⁇ sd deviates from the average detected angular velocity ⁇ saved, even though the crank angular velocity is constant.
- the detection section angular velocity ⁇ sd gradually shifts, causing an error.
- FIG. 12 shows the control behavior when corrected as in equation (17).
- the average value ⁇ id_ave of the ideal section angular velocity ⁇ id matches the average detected angular velocity ⁇ saved
- the average value ⁇ sd_ave of the detected section angular velocity ⁇ sd can be prevented from deviating from the average detected angular velocity ⁇ saved, and the detected section angular velocity ⁇ sd
- the correction value changing unit 56 changes the detection interval angular velocity ⁇ sd(n), which is the angular velocity corresponding to the angle interval calculated by the time interval ⁇ Tdc and the angular interval ⁇ dc after the correction process using the correction value Kc. ) changes the correction value Kc(n) of each angular section Sd(n) so that it approaches the ideal section angular velocity ⁇ id(n).
- the ideal section angular velocity ⁇ id is the section angular velocity in the ideal state, so high frequency components due to variations in the tooth arrangement crank angle are not superimposed. Therefore, by changing the correction value Kc(n) of each angle section Sd(n) so that the detection section angular velocity ⁇ sd(n) approaches the ideal section angular velocity ⁇ id(n), the tooth arrangement crank angle can be changed.
- the correction value Kc(n) can be appropriately changed so as to cancel out the difference.
- the correction value changing unit 56 increases the correction value Kc(n) and When the angular velocity ⁇ sd(n) is lower than the ideal section angular velocity ⁇ id(n), the correction value Kc(n) is decreased.
- the correction value changing unit 56 performs the detection corresponding to each of the angle sections Sd(n) based on the time interval ⁇ Tdc(n) and the angular interval ⁇ dc(n) after the correction process using the correction value Kc. Calculate the section angular velocity ⁇ sd(n).
- the correction value changing unit 56 updates the correction value Kc(n) using the following equation.
- Klrn is a learning rate, and is set to a value of 1 or less.
- the correction value changing unit 56 changes each of the average processing angle sections Save every time the calculation process of the ideal section angular velocity ⁇ id(n) of each angle section Sd(n) of the average processing angle section Save is completed.
- the processing for changing the correction value Kc(n) of the angle section Sd(n) is executed all at once.
- the correction value changing unit 56 changes the correction value Kc when the internal combustion engine is in an unburned state where combustion is not performed (when the first condition is met). On the other hand, the correction value changing unit 56 does not change the correction value Kc when the internal combustion engine is in a combustion state in which combustion is being performed (when the first condition is not satisfied).
- the unburned state includes a fuel cut state in which the supply of fuel is stopped.
- the correction value changing unit 56 changes the correction value Kc when the absolute value of the amount of change in the average value of the detection section angular velocity ⁇ sd is less than or equal to the change amount determination value (when the second condition is met). On the other hand, when the absolute value of the amount of change exceeds the amount of change determination value (when the second condition is not met), the correction value changing unit 56 does not change the correction value Kc.
- the average value of the detection interval angular velocity ⁇ sd is, for example, the average value of an average period such as an average processing angle interval Save or a stroke cycle.
- the correction value changing unit 56 changes the correction value Kc when the operation amount of the brake mechanism of the vehicle equipped with the internal combustion engine is less than or equal to the operation amount determination value (when the third condition is satisfied). On the other hand, the correction value changing unit 56 does not change the correction value Kc when the operation amount of the brake mechanism exceeds the operation amount determination value (when the third condition is not satisfied).
- the correction value changing unit 56 changes the correction value Kc when the clutch mechanism connected to the crankshaft is in a released state (when the fourth condition is satisfied). On the other hand, the correction value changing unit 56 does not change the correction value Kc when the clutch mechanism is in the connected state (when the fourth condition is not satisfied).
- the clutch mechanism is provided between the crankshaft and the transmission.
- the accuracy of changing the correction value Kc may deteriorate due to the external load torque Tload transmitted from the wheel side. Therefore, by changing the correction value Kc when the clutch mechanism is in the released state, the accuracy of changing the correction value Kc can be improved.
- the correction value changing unit 56 changes the correction value Kc when the cooling water temperature of the internal combustion engine is equal to or higher than the first water temperature determination value (when the fifth condition is satisfied). On the other hand, the correction value changing unit 56 does not change the correction value Kc when the cooling water temperature is less than the first water temperature determination value (when the fifth condition is not satisfied). Alternatively, when the cooling water temperature is equal to or higher than the first water temperature determination value and lower than or equal to the second water temperature determination value which is higher than the first water temperature determination value (when the fifth condition is satisfied), the correction value changing unit 56 Then, the correction value Kc is changed.
- the correction value changing unit 56 changes the correction value Kc when the cooling water temperature is less than the first water temperature determination value or when the cooling water temperature is higher than the second water temperature determination value (when the fifth condition is not satisfied). Don't change it.
- the first water temperature determination value and the second water temperature determination value are preset to values such that the correction value Kc is changed when the internal combustion engine is warmed up and the cooling water temperature is at the normal operating temperature.
- the correction value changing unit 56 changes the correction value Kc when all of the first to fifth conditions described above are satisfied, and when any one of the first to fifth conditions is satisfied. If this is not true, the correction value Kc is not changed. Alternatively, all of the first to fifth conditions may not be used, and at least the first condition may be used.
- FIG. 13 shows the crank angular velocity ⁇ dcmp without correction processing calculated based on the angular interval ⁇ d and time interval ⁇ Td that have not been corrected by the correction value Kc when there is a change in the tooth arrangement crank angle, and the crank angular velocity ⁇ dcmp that is not corrected by the correction value Kc.
- the behavior of the highly accurate crank angular velocity ⁇ * detected by the highly accurate rotation sensor and the crank angular velocity ⁇ d after correction processing using the correction value Kc is shown.
- the crank angular velocity ⁇ d after the correction process approaches the highly accurate crank angular velocity ⁇ * for measurement from the crank angular velocity ⁇ dcmp without the correction process. Therefore, the correction value Kc can be appropriately changed so as to cancel out the variation in the tooth arrangement crank angle, and the detection error of the crank angle ⁇ d can be corrected with high accuracy.
- Embodiment 2 A control device 50 according to a second embodiment will be explained with reference to the drawings. Explanation of the same components as in the first embodiment described above will be omitted.
- the basic configuration of the control device 50 according to the present embodiment is the same as that of the first embodiment, but the processing of the ideal angular velocity calculation unit 55 is different from the first embodiment.
- the ideal angular velocity calculation unit 55 determines the tooth arrangement crank based on the estimated value Tcrke(n) of the shaft torque of each angle section Sd(n) and the moment of inertia Icrk of the crankshaft system.
- An ideal section angular velocity ⁇ id which is an angular velocity corresponding to each of the angular sections Sd, in an ideal state assuming that there is no change in angle is calculated.
- the ideal angular velocity calculation unit 55 calculates a correction value Kc(n) for each of the angle intervals Sd(n) so that the average value ⁇ sd_ave of the detected interval angular velocities ⁇ sd in the average processing angle interval Save does not deviate from the average detected angular velocity ⁇ saved.
- the average value ⁇ id_ave of the ideal interval angular velocity ⁇ id is made to match the average detected angular velocity ⁇ saved.
- the ideal angular velocity calculation unit 55 calculates the angle interval Sd(n) based on the estimated value Tcrke(n) of the shaft torque of each angle interval Sd(n) and the moment of inertia Icrk of the crankshaft system. ), the ideal section angular acceleration ⁇ id(n), which is the angular acceleration in the ideal state, is calculated. This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the ideal angular velocity calculation unit 55 changes the angle interval Sd to the advance side one by one to set the angle interval Scal(n) to be calculated, and sets the angle interval Scal(n) to be calculated.
- Q is an angle identification number corresponding to the first angle interval of the average processing angle interval Save
- R is an angle identification number corresponding to the end angle interval of the average processing angle interval Save.
- the ideal angular velocity calculation unit 55 calculates the ideal section angular acceleration ⁇ id(n) corresponding to the angle section Scal(n) to be calculated, and the angle section Scal(n-) to be calculated on the one retarded side. Based on the temporary ideal interval angular velocity ⁇ idtmp(n-1) calculated in 1), calculate the ideal time interval ⁇ Tid(n), which is the time interval of the ideal state corresponding to the angle interval Scal(n) to be calculated. .
- the ideal angular velocity calculation unit 55 calculates the ideal state corresponding to the angle interval Scal (n) to be calculated, based on the ideal time interval ⁇ Tid (n) corresponding to the angle interval Scal (n) to be calculated.
- a tentative ideal section angular velocity ⁇ idtmp(n) which is the angular velocity of ⁇ idtmp(n), is calculated.
- the ideal angular velocity calculation unit 55 calculates the average value ⁇ idtmp_ave of the temporary ideal section angular velocity ⁇ idtmp in the average processing angle section Save.
- the ideal angular velocity calculation unit 55 subtracts the average value ⁇ idtmp_ave of the tentative ideal section angular velocities from the tentative ideal section angular velocity ⁇ idtmp, and adds the average detected angular velocity ⁇ saved, and sets the value as the ideal section angular velocity ⁇ id. calculate. This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the average value ⁇ id_ave of the ideal interval angular velocity ⁇ id in the average processing angle interval Save can be made to match the average detected angular velocity ⁇ saved. Therefore, the correction value Kc is changed so that the detection interval angular velocity ⁇ sd approaches the ideal interval angular velocity ⁇ id, so that the average value ⁇ sd_ave of the detection interval angular velocity ⁇ sd in the average processing angle interval Save does not deviate from the average detected angular velocity ⁇ saved. , the correction value Kc can be changed.
- Embodiment 3 A control device 50 according to Embodiment 3 will be described with reference to the drawings. Explanation of the same components as those in the first or second embodiment described above will be omitted.
- the basic configuration of the control device 50 according to this embodiment is the same as that of the first or second embodiment, but the processing of the correction value changing unit 56 is different from the first or second embodiment.
- the correction value changing unit 56 sets each correction value of the angle section Sd(n) so that the average value ⁇ sd_ave of the detection section angular velocity ⁇ sd in the average processing angle section Save does not deviate from the average detected angular velocity ⁇ saved.
- the average value ⁇ sd_ave of the detection interval angular velocity ⁇ sd in the average processing angle interval Save is made to match the average detected angular velocity ⁇ saved.
- the correction value changing unit 56 calculates the angular velocity corresponding to each of the angle sections Sd(n) based on the time interval ⁇ Tdc(n) and the angular interval ⁇ dc(n) after the correction process using the correction value.
- the basic detection section angular velocity ⁇ sdbs(n) is calculated. The following equation is used for this calculation process. This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the correction value changing unit 56 changes the angle corresponding to each of the angle sections Sd(n) based on the basic detection section angular velocity ⁇ sdbs(n) and the time interval ⁇ Tdc(n) corresponding to each of the angle sections Sd(n).
- This calculation process is performed for each angle section Sd(n) of the average processing angle section Save.
- the correction value changing unit 56 calculates an average value ⁇ sdtmp_ave of the temporary detection interval angular velocity ⁇ sdtmp in the average processing angle interval Save.
- the correction value changing unit 56 subtracts the average value ⁇ sdtmp_ave of the tentative detection section angular velocities from the tentative detection section angular velocity ⁇ sdtmp(n), and adds the average detected angular velocity ⁇ saved. It is calculated as the detection section angular velocity ⁇ sd(n). This calculation process is performed for the angle section Sd(n) of the average processing angle section Save.
- the average value ⁇ sd_ave of the detection section angular velocity in the average processing angle section Save can be made to match the average detection angular velocity ⁇ saved. Therefore, the correction value Kc can be changed so that the average value ⁇ sd_ave of the detection interval angular velocity ⁇ sd in the average processing angle interval Save does not deviate from the average detected angular velocity ⁇ saved.
- the correction value changing unit 56 changes the angle interval so that the detection interval angular velocity ⁇ sd(n) approaches the ideal interval angular velocity ⁇ id(n) for each angle interval Sd(n).
- Each correction value Kc(n) of Sd(n) is changed.
- the second crank angle sensor 6 corresponds to the "specific crank angle sensor” in the present application
- the flywheel 27 corresponds to the "rotating member” in the present application
- the flywheel 27 corresponds to the "rotating member” in the present application.
- the case where the teeth of the ring gear 25 provided in the ring gear 25 correspond to the "detected part" in the present application has been described as an example.
- the embodiments of the present application are not limited to this.
- the first crank angle sensor 11 corresponds to a "specific crank angle sensor” in the present application
- the signal plate 10 corresponds to a “rotating member” in the present application
- the plurality of teeth provided on the signal plate 10 correspond to a “specific crank angle sensor” in the present application. It may correspond to the "detected part” in .
- the internal combustion engine 1 is a gasoline engine
- the embodiments of the present application are not limited to this. That is, the internal combustion engine 1 may be any of various internal combustion engines such as a diesel engine or an engine that performs HCCI combustion (Homogeneous-Charge Compression Ignition Combustion).
- HCCI combustion Homogeneous-Charge Compression Ignition Combustion
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Abstract
Description
前記特定クランク角センサの出力信号に基づいて、クランク角度を検出すると共に前記クランク角度を検出した検出時刻を検出し、検出した前記クランク角度である検出角度に基づいて、前記検出角度の間の角度区間に対応する角度間隔を算出し、前記検出時刻に基づいて、前記角度区間に対応する時間間隔を算出する角度情報検出部と、
前記角度区間のそれぞれの前記角度間隔又は前記時間間隔を、前記角度区間のそれぞれに対応して1つずつ設けた補正値により補正する角度情報補正部と、
前記ガス圧センサの出力信号に基づいて、前記吸気管内のガス圧を検出する吸気管ガス圧検出部と、
前記吸気管内のガス圧の検出値、及び前記検出角度に基づき、クランク機構の物理モデル式を用いて、気筒内のガス圧及びピストンの往復運動によるクランク軸の軸トルクを、前記角度区間のそれぞれに対応して推定する軸トルク推定部と、
前記角度区間のそれぞれの前記軸トルクの推定値、及びクランク軸系の慣性モーメントに基づいて、前記複数の被検出部が配置された前記複数のクランク角度に変動がないと仮定した理想状態における、前記角度区間のそれぞれに対応する角速度である理想区間角速度を算出する理想角速度算出部と、
前記角度区間のそれぞれについて、前記補正値による補正処理後の前記時間間隔及び前記角度間隔により算出される前記角度区間に対応する角速度である検出区間角速度が、前記理想区間角速度に近づくように、前記角度区間のそれぞれの前記補正値を変化させる補正値変化部と、を備えたものである。
実施の形態1に係る内燃機関1の制御装置50(以下、単に制御装置50と称す)について図面を参照して説明する。図1及び図2は、本実施の形態に係る内燃機関1及び制御装置50の概略構成図であり、図3は、本実施の形態に係る制御装置50のブロック図である。内燃機関1及び制御装置50は、車両に搭載され、内燃機関1は、車両(車輪)の駆動力源となる。
まず、内燃機関1の構成について説明する。図1に示すように、内燃機関1は、空気と燃料の混合気を燃焼する気筒7を備えている。内燃機関1は、気筒7に空気を供給する吸気管23と、気筒7で燃焼した排気ガスを排出する排気管17とを備えている。内燃機関1は、ガソリンエンジンとされている。内燃機関1は、吸気管23を開閉するスロットルバルブ4を備えている。スロットルバルブ4は、制御装置50により制御される電気モータにより開閉駆動される電子制御式スロットルバルブとされている。スロットルバルブ4には、スロットルバルブ4の開度に応じた電気信号を出力するスロットル開度センサ19が設けられている。
次に、制御装置50について説明する。
制御装置50は、内燃機関1を制御対象とする制御装置である。図3に示すように、制御装置50は、吸気管ガス圧検出部51、角度情報検出部52、角度情報補正部53、軸トルク推定部54、理想角速度算出部55、補正値変化部56、及び一回転時間検出部57等の制御部を備えている。制御装置50の各制御部51から57等は、制御装置50が備えた処理回路により実現される。具体的には、制御装置50は、図4に示すように、処理回路として、CPU(Central Processing Unit)等の演算処理装置90(コンピュータ)、演算処理装置90にバス等の信号線を介して接続された記憶装置91、演算処理装置90に外部の信号を入力する入力回路92、および演算処理装置90から外部に信号を出力する出力回路93等を備えている。
吸気管ガス圧検出部51は、ガス圧センサ8の出力信号に基づいて、吸気管内のガス圧Pindを検出する。所定の検出周期ごとに吸気管内のガス圧Pindが検出される。
角度情報検出部52は、図5に示すように、特定クランク角センサとされた第2クランク角センサ6の出力信号に基づいてクランク角度θdを検出すると共にクランク角度θdを検出した検出時刻Tdを検出する。そして、角度情報検出部52は、検出したクランク角度である検出角度θdに基づいて、検出角度θdの間の角度区間Sdに対応する角度間隔Δθdを算出し、検出時刻Tdに基づいて、角度区間Sdに対応する時間間隔ΔTdを算出する。
角度情報補正部53は、角度区間Sdのそれぞれの角度間隔Δθd又は時間間隔ΔTdを、角度区間Sdのそれぞれに対応して1つずつ設けた補正値Kcにより補正する。
角度情報検出部52は、補正値Kcにより補正処理後の角度間隔Δθdc及び時間間隔ΔTdcに基づいて、検出角度θd又は角度区間Sdのそれぞれに対応する、クランク角度θdの時間変化率であるクランク角速度ωd、およびクランク角速度ωdの時間変化率であるクランク角加速度αdを算出する。
リングギア25の歯の製造誤差及び経年変化により、各歯が配置されたクランク角度が6度ごとの規定の角度から変動する。図8に、歯の配置クランク角度に変動が生じた場合に、補正値Kcにより補正されていない角度間隔Δθd及び時間間隔ΔTdに基づいて算出された補正処理なしのクランク角速度ωdcmpと、計測用に設けられた高精度の回転センサにより検出した高精度のクランク角速度ω*との挙動を示す。図8に示すように、各歯の配置クランク角度の変動により、補正処理なしのクランク角速度ωdcmpは、計測用の高精度のクランク角速度ω*に対して変動している。
軸トルク推定部54は、吸気管内のガス圧の検出値Pind、及び検出角度θdに基づき、クランク機構の物理モデル式を用いて、気筒内のガス圧及びピストンの往復運動によるクランク軸の軸トルクTcrke(n)を、角度区間Sd(n)のそれぞれに対応して推定する。
一回転時間検出部57は、第2クランク角センサ6の出力信号に基づいて、クランク軸が一回転する一回転角度間隔S360の時間間隔である一回転時間間隔ΔT360を検出し、一回転時間間隔の検出値ΔT360に基づいて、一回転角度間隔S360の範囲内に設定した平均処理角度区間Saveの平均角速度である平均検出角速度ωsavedを算出する。
理想角速度算出部55は、角度区間Sd(n)のそれぞれの軸トルクの推定値Tcrke(n)、及びクランク軸系の慣性モーメントIcrkに基づいて、複数の歯が配置された複数のクランク角度(以下、歯の配置クランク角度とも称す)に変動がないと仮定した理想状態における、角度区間Sdのそれぞれに対応する角速度である理想区間角速度ωidを算出する。
補正値変化部56は、角度区間Sd(n)のそれぞれについて、補正値Kcによる補正処理後の時間間隔ΔTdc及び角度間隔Δθdcにより算出される角度区間に対応する角速度である検出区間角速度ωsd(n)が、理想区間角速度ωid(n)に近づくように、角度区間Sd(n)のそれぞれの補正値Kc(n)を変化させる。
実施の形態2に係る制御装置50について図面を参照して説明する。上記の実施の形態1と同様の構成部分は説明を省略する。本実施の形態に係る制御装置50の基本的な構成は実施の形態1と同様であるが、理想角速度算出部55の処理が実施の形態1と異なる。
実施の形態3に係る制御装置50について図面を参照して説明する。上記の実施の形態1又は2と同様の構成部分は説明を省略する。本実施の形態に係る制御装置50の基本的な構成は実施の形態1又は2と同様であるが、補正値変化部56の処理が実施の形態1又は2と異なる。
(1)上記の実施の形態1においては、第2クランク角センサ6が、本願における「特定クランク角センサ」に相当し、フライホイール27が、本願における「回転部材」に相当し、フライホイール27に設けられたリングギア25の歯が、本願における「被検出部」に相当する場合を例に説明した。しかし、本願の実施の形態はこれに限定されない。すなわち、第1クランク角センサ11が、本願における「特定クランク角センサ」に相当し、信号板10が、本願における「回転部材」に相当し、信号板10に設けられた複数の歯が、本願における「被検出部」に相当してもよい。
Claims (12)
- クランク軸と一体回転する回転部材に、予め定められた複数のクランク角度に設けられた複数の被検出部と、非回転部材に固定され、前記被検出部を検出する特定クランク角センサと、吸気管内のガス圧を検出するガス圧センサと、を備えた内燃機関を制御する内燃機関の制御装置であって、
前記特定クランク角センサの出力信号に基づいて、クランク角度を検出すると共に前記クランク角度を検出した検出時刻を検出し、検出した前記クランク角度である検出角度に基づいて、前記検出角度の間の角度区間に対応する角度間隔を算出し、前記検出時刻に基づいて、前記角度区間に対応する時間間隔を算出する角度情報検出部と、
前記角度区間のそれぞれの前記角度間隔又は前記時間間隔を、前記角度区間のそれぞれに対応して1つずつ設けた補正値により補正する角度情報補正部と、
前記ガス圧センサの出力信号に基づいて、前記吸気管内のガス圧を検出する吸気管ガス圧検出部と、
前記吸気管内のガス圧の検出値、及び前記検出角度に基づき、クランク機構の物理モデル式を用いて、気筒内のガス圧及びピストンの往復運動によるクランク軸の軸トルクを、前記角度区間のそれぞれに対応して推定する軸トルク推定部と、
前記角度区間のそれぞれの前記軸トルクの推定値、及びクランク軸系の慣性モーメントに基づいて、前記複数の被検出部が配置された前記複数のクランク角度に変動がないと仮定した理想状態における、前記角度区間のそれぞれに対応する角速度である理想区間角速度を算出する理想角速度算出部と、
前記角度区間のそれぞれについて、前記補正値による補正処理後の前記時間間隔及び前記角度間隔により算出される前記角度区間に対応する角速度である検出区間角速度が、前記理想区間角速度に近づくように、前記角度区間のそれぞれの前記補正値を変化させる補正値変化部と、を備えた内燃機関の制御装置。 - 前記特定クランク角センサの出力信号に基づいて、前記クランク軸が一回転する一回転角度間隔の時間間隔である一回転時間間隔を検出し、前記一回転時間間隔の検出値に基づいて、前記一回転角度間隔の範囲内に設定した平均処理角度区間の平均角速度である平均検出角速度を算出する一回転時間検出部を更に備え、
前記補正値変化部及び前記理想角速度算出部は、前記平均処理角度区間における前記検出区間角速度の平均値が、前記平均検出角速度から逸脱しないように、前記角度区間のそれぞれの前記補正値を変化させる請求項1に記載の内燃機関の制御装置。 - 前記一回転時間検出部は、相互に重複しつつ角度をずらした第1の一回転角度間隔と第2の一回転角度間隔とのそれぞれについて、第1の一回転時間間隔及び第2の一回転時間間隔を検出し、前記第1の一回転角度間隔と前記第2の一回転角度間隔との間で重複している角度区間を前記平均処理角度区間に設定し、前記第1の一回転時間間隔と前記第2の一回転時間間隔の平均値に基づいて、前記平均処理角度区間の時間間隔を算出し、前記平均処理角度区間の時間間隔に基づいて、前記平均検出角速度を算出する請求項2に記載の内燃機関の制御装置。
- 前記理想角速度算出部は、前記角度区間のそれぞれの前記軸トルクの推定値、及び前記クランク軸系の慣性モーメントに基づいて、前記角度区間のそれぞれに対応する前記理想状態の角加速度である理想区間角加速度を算出し、前記理想区間角加速度を積分して、前記角度区間のそれぞれに対応する前記理想状態の角速度である仮の理想区間角速度を算出し、
前記平均処理角度区間における前記仮の理想区間角速度の平均値を算出し、
前記仮の理想区間角速度から、前記仮の理想区間角速度の平均値を減算し、前記平均検出角速度を加算した値を、前記理想区間角速度として算出する請求項2又は3に記載の内燃機関の制御装置。 - 前記理想角速度算出部は、
前記角度区間のそれぞれの前記軸トルクの推定値、及び前記クランク軸系の慣性モーメントに基づいて、前記角度区間のそれぞれに対応する前記理想状態の角加速度である理想区間角加速度を算出し、
前記角度区間を一つずつ進角側に変化させて演算対象の角度区間を設定し、前記演算対象の角度区間に対応する前記理想区間角加速度、及び一つ遅角側の前記演算対象の角度区間において算出された仮の理想区間角速度に基づいて、前記演算対象の角度区間に対応する前記理想状態の時間間隔である理想時間間隔を算出し、前記演算対象の角度区間に対応する前記理想時間間隔に基づいて、前記演算対象の角度区間に対応する前記理想状態の角速度である前記仮の理想区間角速度を算出し、
前記平均処理角度区間における前記仮の理想区間角速度の平均値を算出し、
前記仮の理想区間角速度から、前記仮の理想区間角速度の平均値を減算し、前記平均検出角速度を加算した値を、前記理想区間角速度として算出する請求項2又は3に記載の内燃機関の制御装置。 - 前記補正値変化部は、前記補正値による補正処理後の前記時間間隔及び前記角度間隔に基づいて、前記角度区間のそれぞれに対応する角速度である基礎の検出区間角速度を算出し、
前記角度区間のそれぞれに対応する前記基礎の検出区間角速度及び前記時間間隔に基づいて、前記角度区間のそれぞれに対応する角加速度である基礎の検出区間角加速度を算出し、前記基礎の検出区間角加速度を積分して、前記角度区間のそれぞれに対応する角速度である仮の検出区間角速度を算出し、
前記平均処理角度区間における前記仮の検出区間角速度の平均値を算出し、
前記仮の検出区間角速度から、前記仮の検出区間角速度の平均値を減算し、前記平均検出角速度を加算した値を、前記検出区間角速度として算出する請求項2又は3に記載の内燃機関の制御装置。 - 前記角度情報検出部は、前記補正値による補正処理後の前記時間間隔及び前記角度間隔に基づいてクランク角加速度の検出値を算出し、
前記軸トルク推定部は、前記クランク角加速度の検出値、及び前記クランク軸系の慣性モーメントに基づいてクランク軸の軸トルクの検出値を算出し、
ピストンの上死点近傍のクランク角度において算出された前記軸トルクの推定値及び前記軸トルクの検出値に基づいて、内燃機関の外部からクランク軸にかかるトルクである外部負荷トルクを算出し、
前記外部負荷トルクにより前記軸トルクの推定値を補正する請求項1から6のいずれか一項に記載の内燃機関の制御装置。 - 前記補正値変化部は、前記内燃機関が燃焼を行っていない未燃焼状態である場合に、前記補正値を変化させる請求項1から7のいずれか一項に記載の内燃機関の制御装置。
- 前記補正値変化部は、前記検出区間角速度の平均値の変化量の絶対値が、変化量判定値以下である場合に、前記補正値を変化させる請求項1から8のいずれか一項に記載の内燃機関の制御装置。
- 前記補正値変化部は、前記内燃機関が搭載された車両のブレーキ機構の動作量が、動作量判定値以下である場合に、前記補正値を変化させる請求項1から9のいずれか一項に記載の内燃機関の制御装置。
- 前記補正値変化部は、前記クランク軸が連結されたクラッチ機構が解放状態である場合に、前記補正値を変化させる請求項1から10のいずれか一項に記載の内燃機関の制御装置。
- 前記補正値変化部は、前記内燃機関の冷却水温が、第1の水温判定値以上である場合、又は前記冷却水温が、前記第1の水温判定値以上でかつ、前記第1の水温判定値よりも高い第2の水温判定値以下である場合に、前記補正値を変化させる請求項1から11のいずれか一項に記載の内燃機関の制御装置。
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