EP2241739A2 - Contrôleur d'un moteur à combustion pour synchroniser le moteur durant l'arrêt - Google Patents

Contrôleur d'un moteur à combustion pour synchroniser le moteur durant l'arrêt Download PDF

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Publication number
EP2241739A2
EP2241739A2 EP10159232A EP10159232A EP2241739A2 EP 2241739 A2 EP2241739 A2 EP 2241739A2 EP 10159232 A EP10159232 A EP 10159232A EP 10159232 A EP10159232 A EP 10159232A EP 2241739 A2 EP2241739 A2 EP 2241739A2
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EP
European Patent Office
Prior art keywords
learning
engine
loss torque
learning value
torque characteristic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10159232A
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German (de)
English (en)
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EP2241739A3 (fr
EP2241739B1 (fr
Inventor
Yamato Utsunomiya
Misao Shibata
Kenji Kawahara
Koji Okamura
Masatomo Yoshihara
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Denso Corp
Original Assignee
Denso Corp
Toyota Motor Corp
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Publication date
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Publication of EP2241739A2 publication Critical patent/EP2241739A2/fr
Publication of EP2241739A3 publication Critical patent/EP2241739A3/fr
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Publication of EP2241739B1 publication Critical patent/EP2241739B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2477—Methods of calibrating or learning characterised by the method used for learning
    • F02D41/248—Methods of calibrating or learning characterised by the method used for learning using a plurality of learned values
    • 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
    • F02D2041/0095—Synchronisation of the cylinders during engine shutdown
    • 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
    • F02D2200/1006—Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/005—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/005—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
    • F02N2019/008—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation the engine being stopped in a particular position

Definitions

  • the present invention relates to an engine controller having a loss torque learning function for learning a loss torque characteristics of an engine.
  • JP-2008-215182A shows an engine controller which controls the engine in such a manner that the engine is stopped at a specified crank angle when an engine stop requirement is generated.
  • the engine controller computes a target track by means of a learning value of a loss torque characteristic.
  • the target track indicates an engine rotation behavior until the engine stops at a target stop crank angle.
  • the engine controller controls a load of a component driven by the engine in such a manner that the actual engine rotation behavior agrees with the target track.
  • the engine controller learns a loss torque characteristic of the engine based on at least actual engine rotation behavior.
  • a dispersion in the engine rotation behavior can be compensated enough and the engine stop crank angle can be controlled with high accuracy.
  • the present invention is made in view of the above matters, and it is an object of the present invention to provide an engine controller which can enhance a learning accuracy with respect to a loss torque characteristic of an engine.
  • An engine controller includes a memory means for storing a loss torque characteristic of an engine as a learning value, and a loss torque learning means for updating the learning value based on a loss torque characteristic which is computed based on an actual engine rotation behavior.
  • the loss torque learning means includes a first learning means for updating the learning value based on the learning value stored in the memory means and a presently computed loss torque characteristic, a second learning means for updating the learning value based on the presently computed loss torque characteristic without using the learning value stored in the memory means and a switching means for switching between the first learning means and the second learning means in order to update the learning value.
  • the first learning means can obtain a reliable learning value without receiving any influence of temporal variation in the loss torque characteristic.
  • the second learning means can promptly obtain the learning value according to a present actual loss torque characteristic.
  • the first learning means and the second learning means are properly switched to update the learning value.
  • the loss torque characteristic learning can be performed in both cases where the learning value is needed to be gradually updated in view of an improvement of the reliability and where the learning value is needed to be updated based on the actual loss torque characteristic in view of an improvement of the convergence.
  • the loss torque characteristic learning can be performed suitably.
  • an update amount of the learning value by the first learning means is restricted by the learning value stored in the memory, and an update amount of the learning value by the second learning means is not restricted by the stored learning value. Therefore, the learning value by the second learning means is promptly converged to the proper learning value with respect to the actual loss torque characteristic.
  • An internal combustion engine is a multi-cylinder gasoline engine.
  • An engine control system includes an electronic control unit (ECU) which executes a fuel injection control, an ignition timing control, an idle reduction control and the like.
  • ECU electronice control unit
  • FIG. 1 shows an entire engine control system.
  • An engine 10 is provided with a throttle valve 14 in an intake pipe 11.
  • the throttle valve 14 is electrically driven by a throttle actuator 15 such as a DC motor.
  • a position of the throttle valve 14 is detected by a throttle position sensor (not shown) provided in the throttle actuator 15.
  • a surge tank 16 including an intake air pressure sensor 17 is provided downstream of the throttle valve 14.
  • the intake air pressure sensor 17 detects intake air pressure.
  • An intake manifold 18 which introduces air into each cylinder of the engine 10 is provided downstream of the surge tank 16, and a fuel injector 19 which injects the fuel is provided at a vicinity of an intake port of the intake manifold 18 of each cylinder.
  • An intake valve 21 and an exhaust valve 22 are respectively provided to an intake port and an exhaust port of the engine 10.
  • air-fuel mixture is introduced into a combustion chamber 23.
  • exhaust valve 22 is opened, exhaust gas is discharged into the exhaust pipe 24.
  • a spark plug 27 is disposed for each of the cylinder on a cylinder head of the engine 10.
  • the spark plug 27 receives high voltage from an ignition apparatus (not shown) at a specified ignition timing.
  • the spark plug 27 generates spark to ignite the air-fuel mixture in the combustion chamber 23.
  • a three-way catalyst 31 for purifying CO, HC, NOx and the like in the exhaust gas is provided in the exhaust pipe 24.
  • An A/F sensor 32 detecting air-fuel ratio of the exhaust gas is provided in the exhaust pipe 24 upstream of the three-way catalyst 31.
  • the engine 10 is provided with a coolant temperature sensor 33 detecting coolant temperature, a crank angle sensor 34 outputting a crank angle signal of rectangular shape for every specified crank angle (for example 30°CA) of a crankshaft, and a cam angle sensor 35 outputting a cam angle signal for every specified cam angle.
  • the engine control system includes an accelerator position sensor 36 detecting an accelerator position, a brake sensor 37 detecting a stepped amount of a brake pedal, and a vehicle speed sensor 38 detecting a vehicle speed.
  • a rotation of a crankshaft is transmitted to an alternator 39 through a belt.
  • the alternator 39 is driven by the engine 10 to generate electrical energy.
  • a load of the alternator 39 is controllable by performing duty control of its field current.
  • the ECU 40 is comprised of a microcomputer including a CPU, a ROM, a RAM.
  • the ECU 40 executes control programs stored in the ROM to perform various controls according to the engine condition. That is, the ECU 40 receives detection signals from various sensors and performs a fuel injection control, an ignition timing control, an idle reduction control and the like.
  • the ECU 40 stops the fuel injection and the ignition so that the engine is automatically stopped. Further, when an engine restart condition is satisfied while the engine 10 is stopped, a starter (not shown) cranks the engine 10 and the fuel is injected and ignited to automatically restart the engine 10.
  • the engine stop condition includes a condition where the accelerator position sensor 36 indicates the accelerator is not stepped, a condition where the brake sensor 37 indicates the brake pedal is stepped, or a condition where the vehicle speed sensor 38 indicates the vehicle speed is zero.
  • the engine restart condition includes a condition where the brake sensor 37 indicates the brake pedal is not stepped.
  • the ECU 40 functions as a target track computing means for computing a target track which corresponds to a rotation behavior of the engine until the engine stops at a target stop crank angle. Also, the ECU 40 functions as a stop control means for controlling a load of the alternator 39 in such a manner that the rotation behavior of the engine agrees with the target track. Further, the ECU 40 functions as a loss torque learning means for learning a loss torque characteristic based on an actual rotation behavior of the engine 10.
  • the target track is computed based on a target stop crank angle of the engine and a target engine speed at a specified crank angle according to the energy conservation law.
  • the target track is computed in a direction to trace back the crank angle.
  • the energy conservation law is expressed by a following formula.
  • Ne ⁇ i + 1 2 Ne ⁇ i 2 - 2 / J ⁇ Tloss - Tref Ne i
  • N e(i+1) represents an engine speed at a time (i+1) of before a specified crank angle (for example, 180°CA) from present time (i)
  • Ne (i) represents an engine speed at the present time (i)
  • "J" represents an inertia moment of the engine 10
  • Tloss represents a loss torque including a pumping loss and a friction loss at a specified crank angle (for example, at TDC).
  • the ECU 40 has a backup RAM 41, which is a rewritable nonvolatile memory.
  • the loss torque Tloss is stored in the backup RAM 41 as a learning value of a lost torque characteristic.
  • Tref ( Ne ( i )) represents a standard load torque of the alternator 39 at the engine speed Ne (i) of the present time (i).
  • the target track can be expressed by a map indicating a relationship between a crank angle and a target engine speed, which is computed at a specified crank angle interval (for example, 180°CA).
  • the standard load torque Tref ( Ne ( i )) of the alternator 39 is established as the half of the controllable maximum load of the alternator 39, as shown in FIG. 2A .
  • the alternator 39 does not output an assist torque unlike a motor generator, the load torque of the alternator 39 can be controlled in positive and negative directions, so that a followability of the engine rotation behavior to the target track can be improved.
  • the load torque lower than the standard load torque Tref corresponds to a negative load torque
  • the load torque higher than the standard load torque Tref corresponds to a positive load torque.
  • the standard load torque Tref ( Ne ( i )) of the alternator 39 may not be limited to the half of maximum load.
  • the standard load torque Tref ( Ne ( i )) may be 1/3 , 1/4, 2/3, and 3/4 of the maximum load. That is, the standard load torque Tref ( Ne ( i )) is lower than the maximum load torque of the alternator 39 and is greater than zero. (0 ⁇ Tref ( Ne ( i )) ⁇ Maximum load)
  • FIG. 3 A shows a comparative example in which the standard load torque Tref ( Ne ( i )) is set to zero and an engine stop control is performed.
  • the load torque of the alternator 39 can be controlled only in a positive direction.
  • the standard load torque Tref ( Ne ( i )) is set to a suitable value which is greater than zero and lower than the maximum load torque.
  • the load torque of the alternator 39 can be controlled in positive direction and negative direction as shown in FIG. 2B . Even if the actual engine rotation behavior overshoots the target track, the actual engine rotation behavior can be corrected to agree with the target track, as shown in FIG. 3B .
  • the target track is computed based on the loss torque Tloss .
  • the standard load torque Tref ( Ne ( i )) is computed according to the engine speed Ne (i) and a base load torque is computed so that a difference between a target engine speed and an actual engine speed.
  • the standard load torque Tref ( Ne ( i )) is added to the base load torque to obtain a required load torque Talt .
  • the required load torque Talt is multiplied by a pulley ratio "Ratio" to be converted into a required shaft torque Tfinal .
  • a power generation command is computed according to the required load torque Talt (required shaft torque Tfinal ) and the engine speed Ne (i) of the present time (i).
  • the field current of the alternator 39 is controlled based on the power generation command so that the load torque of the alternator 39 is controlled.
  • Such a load torque control of the alternator 39 is performed periodically until the actual engine speed falls to a lower limit engine speed Nelow at which the alternator 39 can generate electricity.
  • the load torque of the alternator 39 is feedback controlled in such a manner that the actual engine rotation behavior agrees with the target track.
  • a loss torque characteristic (loss torque Tloss ) for computing the target track varies due to a manufacturing dispersion and/or a deterioration with age of the engine 10.
  • a loss torque characteristic for computing the target track varies due to a manufacturing dispersion and/or a deterioration with age of the engine 10.
  • the lost torque characteristic is learned and updated based on the actual engine rotation behavior to be stored in the backup RAM 41.
  • the target track is computed based on the updated lost torque characteristic.
  • an energy consumed due to the loss torque during a specified crank angle period is computed and the loss torque characteristic is learned based on the consumed energy. That is, when the fuel combustion is terminated according to the engine stop requirement, the engine runs through its inertia and the actual engine speed starts to decrease due to the loss torque (pumping loss and/or friction loss). In this case, the consumed energy due to the loss torque is accurately computed and the loss torque characteristic is accurately learned based on the consumed energy.
  • the alternator 39 may be stopped. In this case, since the engine runs through its inertia with the alternator 39 stopped, the consumed energy due to the loss torque can be computed more accurately and the learning accuracy of the lost torque characteristic can be enhanced.
  • the loss torque Tloss varies depending on the crank angle of the engine 10 even in a same stroke.
  • the loss torque Tloss can be stored in a table for each crank angle.
  • the backup RAM can be replaced by an EEPROM.
  • a main routine of an engine stop learning control shown in FIG. 4 is executed in a specified time interval while the engine is running.
  • a loss torque characteristic learning routine shown in FIG. 5 is executed. Only when the learning execution condition is established, the loss torque characteristic is learned.
  • a target track computing routine shown in FIG. 6 is executed to compute the target track based on the loss torque characteristic learned in the loss torque characteristic learning routine.
  • an engine stop control routine shown in FIG. 7 is executed to control the load torque of the alternator 39 in such a manner that the actual engine rotation behavior agrees with the target track when the engine 10 will be stopped.
  • the loss torque characteristic learning routine shown in FIG. 5 is a sub-routine executed in step S100 of the main routine shown in FIG. 4 .
  • This loss torque characteristic learning routine corresponds to a loss torque learning means.
  • step S101 it is determined whether a learning execution condition is satisfied.
  • the learning execution condition includes a condition in which the engine 10 is warmed up and is at idling reduction stage. When at least one of following conditions is satisfied, the computer determines that the engine 10 has been warmed up.
  • the learning execution condition may include a condition in which it is a first idle reduction after the warming up of the engine is completed. However, the loss torque characteristic learning can be performed at the second or successive idle reduction.
  • the procedure of this routine ends.
  • step S101 the procedure proceeds to step S102 in which the computer computes a present crank angle ⁇ and a present engine speed based on detection signals from the crank angle sensor 34 and the cam angle sensor 35.
  • step S103 the computer determines whether the present crank angle ⁇ is at top dead center (TDC) which corresponds to a learning value computing timing. When the answer is NO, the procedure of this routine ends. When the answer is YES, the procedure proceeds to step S104 in which the computed engine speed is stored in the RAM as the engine speed Ne (i) at the present TDC.
  • TDC top dead center
  • step S105 an energy amount ⁇ E consumed due to the loss torque during a period between adjacent TDCs (180°CA) is computed according to the following formula.
  • ⁇ E 1 / 2 ⁇ J ⁇ Ne ⁇ i - 1 2 - 1 / 2 ⁇ J ⁇ Ne ⁇ i 2
  • J represents an inertia moment of the engine 10
  • N e(i-1) represents an engine speed at previous TDC.
  • a temporary learning correction torque Tgg and an actual loss torque Tlossg are computed according to the following formulas.
  • Tgg ⁇ E - ⁇ Etg
  • Tlossg ⁇ E wherein ⁇ Etg represents a consumed energy amount due to the loss torque, which was used for computing previous target track.
  • ⁇ Etg is stored in the backup RAM 41.
  • the temporary learning correction torque Tgg and the actual loss torque Tlossg can be computed according to the following formulas.
  • step S107 the computer determines whether an absolute value of an ratio between the loss torque Tloss used for computing a previous target track and the temporary learning correction torque Tgg is less than or equal to a specified determination value. Specifically, the computer determines whether the absolute value
  • the process in step S107 corresponds to a determination means for determining whether a difference between the learning value of the loss torque characteristic stored in the backup RAM 41 and the presently computed loss torque characteristic is greater than or equal to a specified value.
  • step S107 the procedure proceeds to step S108 in which the temporary learning correction torque Tgg is smoothed according to the following formula so that a learning correction torque Tg is computed.
  • Tg present value a ⁇ Tg previous value + b ⁇ Tgg / a + b wherein "a" and "b" are constant numbers.
  • Tg (previous value) is stored in the backup RAM 41.
  • step S109 in which the learning correction torque Tg is added to the loss torque Tloss that was used for computing the previous target track, whereby a present loss torque Tloss is obtained.
  • the loss torque Tloss stored in the backup RAM 41 is updated.
  • step S107 When the answer is NO in step S107, the procedure proceeds to step S110 in which n-counter is incremented by "1". This n-counter is initialized to zero when the learning execution condition is firstly established or when the answer in step S107 is YES. When the answer is successively NO in step S107, the n-counter is continued to be incremented by "1". In step S111, the computer determines whether n-counter is greater than on equal to "3".
  • step S111 When the answer is NO in step S111, the procedure proceeds to step S108.
  • step S111 the procedure proceeds to step S112.
  • the actual loss torque Tlossg computed in step s106 is defined as the present loss torque Tloss , and the loss torque stored in the backup RAM 41 is updated. That is, in step S112, the present loss torque Tloss is computed without using the previous loss torque Tloss and the previous learning correction torque Tg.
  • step S109 corresponds to a first learning means
  • the process in step S112 corresponds to a second learning means
  • the process in step S107 corresponds to a switching means.
  • the target track computing routine shown in FIG. 6 is a sub-routine executed in step S200 of the main routine shown in FIG. 4 .
  • This target track computing routine corresponds to a target track computing means.
  • the target track is established based on the target stop crank angle, the target engine speed at a specified crank angle (TDC) during the engine stop control and the loss torque Tloss (learning value of the loss torque characteristic). Further, when the actual engine speed is brought to coincide with the target engine speed on the target track, two target tracks which deviates 180°CA from each other are established. One of the target tracks is selected, and the target engine speed is computed based on the selected target track. An energy necessary for correcting the actual engine speed to the target engine speed on the selected target track is smaller than that on the other target track.
  • the computer computes a present rotation energy at the present engine speed Ne , a first rotation energy at a first target engine speed Nt (i+1) on the first target track, and a second rotation energy at a second target engine speed Nt ( i ) on the second target track.
  • An energy difference between the present rotation energy and the first rotation energy and an energy difference between the present rotation energy and the second rotation energy are compared with each other.
  • the computer selects one of the target tracks of which the energy difference is smaller than that of the other target track. Based on the selected target track, the target engine speed is computed.
  • step S203 the computer determines whether the present engine speed Ne is less than the target engine speed Nt (i+1) which is a square root of the square value of Nt (i+1) computed in step S202.
  • the present engine speed Ne is excessive relative to the target engine speed Nt (i+1).
  • a higher target engine speed Nt (i+1) is necessary to be computed.
  • step S204 in which i-counter is incremented by "1".
  • step S202 the target engine speed Nt (i+1) is computed again.
  • the target engine speed Nt (i+1) is computed at a crank angle which is traced back by 180°CA.
  • step S203 the procedure proceeds to step S205 in which the computer determines whether ( Nt (i+1) - Ne ) is greater than ( Ne - Nt (i)).
  • the engine stop control routine shown in FIG. 7 is a sub-routine executed in step S300 of the main routine shown in FIG. 4 .
  • This engine stop control routine corresponds to an engine stop control means.
  • step S301 the computer determines whether the engine stop requirement (idle reduction signal) is generated. When the answer is NO in step S301, the procedure ends to continue the engine operation. When the answer is YES in step S301, the procedure proceeds to step S302 in which the present crank angle ⁇ and the engine speed Ne are computed.
  • step S303 the computer determines whether the present crank angle ⁇ is the control timing (TDC) of the load torque of the alternator 39.
  • step S304 the computer determines whether the present engine speed Ne is less than a maximum engine speed Nemax at which the engine stop control can be performed.
  • the procedure ends.
  • the answers in step S303 and S304 are YES, the procedure proceeds to step S305.
  • step S305 the computer determines whether the engine 10 is at a condition of combustion after the engine stop requirement is generated.
  • step S307 the required load torque Talt is computed so that the engine speed Ne agrees with the target engine speed Netg according to the energy conservation law and the standard load torque Tref ( Ne ) of the alternator Talt .
  • the required load torque Talt is computed based on the following formula.
  • Talt J ⁇ K 2 ⁇ ⁇ ⁇ Ne 2 - Netg 2 + Tref Ne
  • J represents an inertia moment of the engine 10
  • K represents a feedback gain
  • ⁇ represents a variation amount in the crank angle (180°CA).
  • the target engine speed Netg can be computed according to a map or mathematical equation. Besides, it is also possible to provide the dead band with respect to the deviation in the engine speed.
  • step S308 the required load torque Talt is multiplied by a pulley ratio "Ratio", so that the required load torque Talt is converted into the required shaft torque Tfinal of the alternator 39.
  • Tfinal Talt ⁇ ⁇ Ratio ⁇
  • step S309 the engine speed Ne is multiplied by the pulley ratio "Ratio" to obtain the alternator rotation speed Nalt.
  • Nalt Ne ⁇ ⁇ Ratio ⁇
  • step S310 a battery voltage is detected.
  • an exciting current "IF” is computed based on the required shaft torque Tfinal , an alternator speed Nalt , and the battery voltage. Specifically, a required load torque characteristic map corresponding to the present battery voltage is selected, the exciting current "IF” is computed based on this selected map. The exciting current "IF” is converted into a generating current (duty ratio "Duty”), and the load torque of the alternator 39 is controlled based on the duty ratio "Duty".
  • the lost torque characteristic is learned and updated based on the actual engine rotation behavior in order to be stored in the backup RAM 41.
  • the dispersion in the loss torque characteristic is compensated by learning and a computation accuracy of the target track can be improved.
  • the load torque of the alternator 39 is controlled in such a manner that the actual engine rotation behavior agrees with the target track when the engine 10 will be stopped.
  • the dispersion in the actual engine rotation behavior can be compensated and the engine stop position can be controlled within the target crank angle range with high accuracy.
  • the first learning means updates the learning value based on the stored learning value ( Tloss ) and the presently computed loss torque characteristic.
  • the second learning means updates the learning value based on the presently computed loss torque characteristic.
  • the loss torque characteristic learning process it is suitably switched between the first learning means and the second learning means.
  • the second learning means updates the learning value based on the presently computed actual loss torque Tlossg without using the loss torque Tloss when a ratio between the loss torque Tloss and the temporal learning correction torque Tgg is greater than a specified determination value.
  • the learning value can converge promptly.
  • the present invention is not limited to the embodiments described above, but may be performed, for example, in the following manner.
  • An ECU (40) includes a backup RAM (41) which stores a learning value of a loss torque characteristic of an engine (10). The learning value is updated based on the loss torque characteristic which is computed based on an actual engine rotation behavior.
  • the ECU (40) includes a first learning portion (S109) for updating the learning value based on the learning value stored in the memory and a presently computed loss torque characteristic, and a second learning portion (S112) for updating the learning value based on the presently computed loss torque characteristic without using the learning value stored in the memory.
  • a switching portion (S107) switches between the first learning portion and the second learning portion in order to update the learning value.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
EP10159232.7A 2009-04-07 2010-04-07 Contrôleur d'un moteur à combustion interne pour synchroniser le moteur durant l'arrêt du moteur Active EP2241739B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009092759A JP5461049B2 (ja) 2009-04-07 2009-04-07 エンジン制御装置

Publications (3)

Publication Number Publication Date
EP2241739A2 true EP2241739A2 (fr) 2010-10-20
EP2241739A3 EP2241739A3 (fr) 2018-07-04
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CN103511102A (zh) * 2012-06-14 2014-01-15 罗伯特·博世有限公司 用于对内燃机的转矩进行适配的方法和装置
CN108227482A (zh) * 2016-12-14 2018-06-29 发那科株式会社 控制系统以及机器学习装置
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JP6308126B2 (ja) * 2014-12-26 2018-04-11 トヨタ自動車株式会社 エンジン停止装置

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Publication number Priority date Publication date Assignee Title
CN103184944A (zh) * 2011-12-29 2013-07-03 罗伯特·博世有限公司 用于运行内燃机的方法
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CN103511102A (zh) * 2012-06-14 2014-01-15 罗伯特·博世有限公司 用于对内燃机的转矩进行适配的方法和装置
CN108227482A (zh) * 2016-12-14 2018-06-29 发那科株式会社 控制系统以及机器学习装置
CN113217205A (zh) * 2020-02-05 2021-08-06 丰田自动车株式会社 内燃机的控制装置及控制方法
CN113217205B (zh) * 2020-02-05 2023-01-03 丰田自动车株式会社 内燃机的控制装置及控制方法

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JP5461049B2 (ja) 2014-04-02
JP2010242633A (ja) 2010-10-28
EP2241739A3 (fr) 2018-07-04
EP2241739B1 (fr) 2019-12-25

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