WO2012032631A1 - 空燃比制御装置 - Google Patents
空燃比制御装置 Download PDFInfo
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- WO2012032631A1 WO2012032631A1 PCT/JP2010/065492 JP2010065492W WO2012032631A1 WO 2012032631 A1 WO2012032631 A1 WO 2012032631A1 JP 2010065492 W JP2010065492 W JP 2010065492W WO 2012032631 A1 WO2012032631 A1 WO 2012032631A1
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- fuel ratio
- air
- spike
- control apparatus
- ratio control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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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
- F02D41/24—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
- F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
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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
- F02D41/24—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
- F02D41/2454—Learning of the air-fuel ratio control
Definitions
- the present invention relates to an air-fuel ratio control device.
- An apparatus for controlling the air-fuel ratio based on the outputs of the upstream air-fuel ratio sensor and the downstream air-fuel ratio sensor provided in the exhaust passage of the internal combustion engine has been widely known (for example, JP-A-6-317204, (See JP 2003-314334 A, JP 2004-183585 A, JP 2005-120869 A, JP 2005-273524 A, etc.).
- the upstream air-fuel ratio sensor is provided on the upstream side in the exhaust flow direction with respect to the exhaust purification catalyst for purifying exhaust from the cylinder (the uppermost one when two or more are provided).
- the downstream air-fuel ratio sensor is provided downstream of the exhaust purification catalyst in the exhaust flow direction.
- the downstream air-fuel ratio sensor has a step-like response before and after the stoichiometric air-fuel ratio (Z characteristic: a characteristic in which the output changes stepwise in such a manner that the output suddenly changes between the rich side and the lean side with respect to the stoichiometric air-fuel ratio. )
- a so-called oxygen sensor also referred to as an O 2 sensor
- the oxygen sensor described above or a so-called A / F sensor also referred to as a linear O 2 sensor whose output changes in proportion to the air-fuel ratio is widely used. It has been.
- the fuel injection amount is feedback-controlled based on the output signal from the upstream air-fuel ratio sensor so that the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst becomes the target air-fuel ratio (
- this control is referred to as “main feedback control”.
- main feedback control In addition to this main feedback control, control is also performed in which an output signal from the downstream air-fuel ratio sensor is fed back to the fuel injection amount (hereinafter, this control is referred to as “sub-feedback control”).
- the sub-feedback correction amount is determined based on the output signal from the downstream air-fuel ratio sensor (more specifically, the deviation between the signal and the target voltage corresponding to the target air-fuel ratio). Calculated. Then, by further feeding back the sub feedback correction amount to the main feedback control, the deviation between the air fuel ratio of the exhaust gas corresponding to the output from the upstream air fuel ratio sensor and the target air fuel ratio is corrected.
- This three-way catalyst has a function called an oxygen storage function or an oxygen storage function.
- This oxygen storage function (1) When the air-fuel ratio of the fuel mixture is lean, it reduces nitrogen oxides by depriving oxygen from the nitrogen oxides in the exhaust, and stores the deprived oxygen inside (2) The function of releasing (stored) oxygen stored in the exhaust gas for oxidation of unburned components when the air-fuel ratio of the fuel mixture is rich.
- the above-described oxygen storage function which is the exhaust purification capacity of this type of three-way catalyst, can be maintained high by activating the catalyst material (noble metal) by repeating the storage and release of oxygen.
- a device that performs control (perturbation control) to forcibly oscillate the air-fuel ratio of the exhaust gas, that is, the air-fuel ratio of the fuel mixture, in order to cause repetition of oxygen storage and release in the three-way catalyst has been widely known.
- control perturbation control
- An internal combustion engine system to which the present invention is applied includes an internal combustion engine having a cylinder therein, an exhaust purification catalyst and a downstream air-fuel ratio sensor mounted in an exhaust passage (exhaust passage exhausted from the cylinder).
- the exhaust purification catalyst is configured to purify exhaust exhausted from the cylinder.
- the downstream air-fuel ratio sensor is attached to the exhaust passage at a portion downstream of the exhaust purification catalyst in the exhaust flow direction, and generates an output corresponding to the air-fuel ratio of the exhaust at the portion. ing.
- the internal combustion engine system may further include an upstream air-fuel ratio sensor.
- the upstream air-fuel ratio sensor is attached to the exhaust passage at a portion upstream of the exhaust purification catalyst and the downstream air-fuel ratio sensor in the exhaust gas flow direction in the internal combustion engine system, and the exhaust gas at the portion is exhausted. An output corresponding to the air-fuel ratio is generated.
- the air-fuel ratio control apparatus of the present invention is an apparatus for controlling the air-fuel ratio of the internal combustion engine based on at least the output of the downstream air-fuel ratio sensor, characterized by reverse spike introduction means and reverse spike interval setting And means.
- the reverse spike introduction means introduces an air-fuel ratio spike (reverse spike) in a direction opposite to the direction during the air-fuel ratio correction required by the output of the downstream air-fuel ratio sensor. Yes. That is, the reverse spike temporarily changes the air-fuel ratio of the exhaust gas in a direction opposite to the air-fuel ratio correction direction required by the output of the downstream air-fuel ratio sensor, rather than the control target air-fuel ratio. This is an air-fuel ratio spike.
- the reverse spike interval setting means sets a reverse spike interval based on the operating state of the internal combustion engine system.
- the reverse spike interval is an interval between two reverse spikes adjacent in time.
- the air-fuel ratio control apparatus may further include deviation acquisition means for acquiring a deviation between the output of the downstream air-fuel ratio sensor and a predetermined target value (for example, a value corresponding to the theoretical air-fuel ratio).
- the reverse spike interval setting means sets the reverse spike interval based on the deviation.
- the reverse spike interval setting means may set the reverse spike interval based on the load of the internal combustion engine (that is, the intake air amount of the cylinder). In this case, specifically, for example, the reverse spike interval setting means sets the reverse spike interval to be shorter as the load is higher (that is, as the intake air amount is larger).
- the reverse spike interval setting means may set the reverse spike interval based on a deterioration state of the exhaust purification catalyst. In this case, specifically, for example, the reverse spike interval setting means sets the reverse spike interval to be shorter as the exhaust purification catalyst deteriorates.
- the air-fuel ratio control apparatus may further include a reverse spike time setting means for setting a reverse spike time (a duration per one reverse spike) based on an operating state of the internal combustion engine system. Good.
- the reverse spike time setting means may set the reverse spike time based on the load of the internal combustion engine.
- the reverse spike time setting means may set the reverse spike time based on a deterioration state of the exhaust purification catalyst.
- the air-fuel ratio control device further includes reverse spike intensity setting means for setting a reverse spike intensity that is an air-fuel ratio fluctuation width in one reverse spike based on the intake air amount of the cylinder. May be.
- the air-fuel ratio control apparatus may further include a downstream learning condition determination unit that permits learning for correcting a steady error in the output of the downstream air-fuel ratio sensor.
- the downstream learning condition determination unit permits the learning based on the reverse spike interval.
- the air / fuel ratio control device changes the direction of change in the output of the downstream air / fuel ratio sensor in the direction opposite to the direction of air / fuel ratio correction required by the output. At this point, the learning is performed by correcting the target value.
- the air-fuel ratio control apparatus may further include an upstream learning condition determination unit that permits learning for correcting a steady error in the output of the upstream air-fuel ratio sensor.
- the upstream-side learning condition determining means permits the learning based on the reverse spike interval.
- the downstream air-fuel ratio sensor generates an output corresponding to the air-fuel ratio (oxygen concentration) in the exhaust discharged (flowed out) from the exhaust purification catalyst.
- an exhaust gas purification action oxygen storage or release reaction
- the substantial exhaust purification part gradually moves toward the downstream end side (rear end side or exhaust outlet side).
- the exhaust purification function oxygen storage or release reaction
- the exhaust purification catalyst can no longer process exhaust.
- exhaust exhaust in the exhaust purification catalyst occurs.
- the air-fuel ratio (oxygen concentration) in the exhaust gas reaching the downstream air-fuel ratio sensor changes suddenly, and as a result, the output of the downstream air-fuel ratio sensor also changes suddenly.
- the reverse spike that is the air-fuel ratio spike in the direction opposite to that direction are introduced at appropriate intervals according to the operating state of the internal combustion engine system. Thereby, generation
- the air-fuel ratio correction in the rich direction is thereby required.
- the nitrogen oxide purification treatment function (oxygen storage) in the exhaust purification catalyst is completely saturated.
- the lean spike in the direction opposite to the rich requested air-fuel ratio correction based on the output of the downstream air-fuel ratio sensor is an appropriate condition (interval or the like) according to the operating state of the internal combustion engine system. ). Then, nitrogen oxides in the lean air-fuel ratio exhaust gas due to lean spikes are purified at the upstream portion (upstream end portion) of the exhaust purification catalyst in the exhaust flow direction. On the other hand, since the air-fuel ratio of the average exhaust gas is still rich, the rich air-fuel ratio exhaust purification portion and the nitrogen oxide purification treatment recovery portion gradually move toward the downstream side in the exhaust flow direction. I will do it.
- the exhaust gas accompanying the lean spike is appropriately processed in the upstream portion in the exhaust flow direction, and the catalytic reaction accompanying the rich air-fuel ratio correction gradually progresses in the midstream portion and the downstream portion. To do. For this reason, the change in the air-fuel ratio (oxygen concentration) of the exhaust gas in the midstream portion and the downstream portion is moderated, thereby suppressing the generation of transient output of the downstream air-fuel ratio sensor as much as possible. Furthermore, the exhaust purification capacity (oxygen storage capacity or oxygen release capacity) in the central part and the downstream part is used evenly.
- the exhaust gas flowing into the exhaust purification catalyst is made lean.
- purification treatment reduction
- nitrogen oxides in the lean air-fuel ratio exhaust gas is performed on the upstream end side in the exhaust flow direction of the exhaust purification catalyst, and the purification treatment function of unburned components is restored.
- Oxygen is occluded.
- the lean air-fuel ratio exhaust purification process part and the unburned component purification process recovery part gradually move downstream.
- the rich spike in the direction opposite to the lean requested air-fuel ratio correction based on the output of the downstream side air-fuel ratio sensor is an appropriate condition (interval or the like) according to the operating state of the internal combustion engine system. ). Then, unburned components in the rich air-fuel ratio exhaust gas due to the rich spike are purified at the upstream portion (upstream end portion) in the exhaust flow direction of the exhaust purification catalyst. On the other hand, since the average air-fuel ratio of the exhaust gas is still lean, the purification process part of the lean air-fuel ratio exhaust and the purification process recovery part of the unburned component gradually move toward the downstream side in the exhaust flow direction. I will do it.
- the exhaust gas accompanying the rich spike is appropriately processed in the upstream portion in the exhaust flow direction, and the catalytic reaction accompanying the air-fuel ratio correction in the lean direction gradually proceeds in the midstream portion and the downstream portion.
- the change in the air-fuel ratio (oxygen concentration) of the exhaust gas in the midstream portion and the downstream portion is moderated, thereby suppressing the generation of transient output of the downstream air-fuel ratio sensor as much as possible.
- the exhaust purification capacity oxygen storage capacity or oxygen release capacity
- FIG. 1 is a schematic diagram showing the overall configuration of an internal combustion engine system to which an embodiment of the present invention is applied.
- FIG. 2 is a graph showing the relationship between the output of the upstream air-fuel ratio sensor shown in FIG. 1 and the air-fuel ratio.
- FIG. 3 is a graph showing the relationship between the output of the downstream air-fuel ratio sensor shown in FIG. 1 and the air-fuel ratio.
- FIG. 4 is a timing chart showing the contents of the control executed in the present embodiment.
- FIG. 5 is a flowchart showing a specific example of processing executed by the CPU shown in FIG.
- FIG. 6 is a flowchart showing a specific example of processing executed by the CPU shown in FIG.
- FIG. 7 is a flowchart showing a specific example of processing executed by the CPU shown in FIG. FIG.
- FIG. 8 is a flowchart showing another specific example of the process executed by the CPU shown in FIG.
- FIG. 9 is a timing chart showing other control contents executed in the present embodiment.
- FIG. 10 is a flowchart showing a specific example of processing corresponding to the control shown in FIG.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine system S (hereinafter simply referred to as “system S”, for example, a vehicle corresponds to this) to which the present invention is applied.
- This system S includes a piston reciprocating spark ignition type multi-cylinder four-cycle engine 1 (hereinafter simply referred to as “engine 1”), and an engine control device 2 which is an embodiment of the air-fuel ratio control device of the present invention.
- FIG. 1 shows a cross-sectional view of a specific cylinder of the engine 1 by a plane orthogonal to the cylinder arrangement direction.
- the engine 1 includes a cylinder block 11 and a cylinder head 12. These are fixed to each other by bolts or the like (not shown). An intake passage 13 and an exhaust passage 14 are connected to the engine 1 (specifically, the cylinder block 11).
- the cylinder block 11 is formed with a cylinder bore 111 that is a substantially cylindrical through hole for constituting a cylinder. As described above, the cylinder block 11 has a plurality of cylinder bores 111 arranged in a line along the cylinder arrangement direction. A piston 112 is accommodated inside each cylinder bore 111 so as to be capable of reciprocating along a central axis of the cylinder bore 111 (hereinafter referred to as “cylinder central axis”).
- crankshaft 113 is rotatably supported while being arranged in parallel with the cylinder arrangement direction.
- the crankshaft 113 is connected to the piston 112 via a connecting rod 114 so as to be rotationally driven based on reciprocal movement along the cylinder central axis of the piston 112.
- a cylinder head 12 is joined to one end of the cylinder block 11 in the direction along the cylinder central axis (the end on the top dead center side of the piston 112: the upper end in the figure).
- a plurality of recesses are provided at positions corresponding to the respective cylinder bores 111 on the end face of the cylinder head 12 on the cylinder block 11 side. That is, in the state where the cylinder head 12 is joined and fixed to the cylinder block 11, the space inside the cylinder bore 111 on the cylinder head 12 side (upper side in the drawing) from the top surface of the piston 112 and the space inside the above-described recess.
- the combustion chamber CC is formed.
- the cylinder head 12 is provided with an intake port 121 and an exhaust port 122 so as to communicate with the combustion chamber CC.
- An intake passage 13 including an intake manifold and a surge tank is connected to the intake port 121.
- the exhaust port 122 is connected to an exhaust passage 14 including an exhaust manifold.
- the cylinder head 12 is provided with an intake valve 123, an exhaust valve 124, an intake valve control device 125, an exhaust camshaft 126, a spark plug 127, an igniter 128, and an injector 129.
- the intake valve 123 is a valve for opening and closing the intake port 121 (that is, controlling the communication state between the intake port 121 and the combustion chamber CC).
- the exhaust valve 124 is a valve for opening and closing the exhaust port 122 (that is, controlling the communication state between the exhaust port 122 and the combustion chamber CC).
- the intake valve control device 125 is a mechanism for controlling the rotation angle (phase angle) of an intake cam and an intake camshaft (not shown) (the specific configuration of such a mechanism is well known, and therefore the description thereof is omitted in this specification. ).
- the exhaust camshaft 126 is configured to drive the exhaust valve 124.
- the spark plug 127 is provided so that the spark generating electrode at the tip thereof is exposed in the combustion chamber CC.
- the igniter 128 includes an ignition coil for generating a high voltage to be applied to the spark plug 127.
- the injector 129 is configured and arranged to inject fuel to be supplied into the combustion chamber CC into the intake port 121.
- a throttle valve 132 is attached at a position between the air filter 131 and the intake port 121 in the intake passage 13.
- the throttle valve 132 is rotationally driven by a throttle valve actuator 133 so that the opening cross-sectional area of the intake passage 13 is variable.
- the upstream side catalytic converter 141 and the downstream side catalytic converter 142 are mounted in the exhaust passage 14.
- the upstream catalytic converter 141 corresponding to the “exhaust purification catalyst” of the present invention is an exhaust purification catalytic device into which exhaust discharged from the combustion chamber CC to the exhaust port 122 first flows, and is more than the downstream catalytic converter 142. It is provided on the upstream side in the exhaust flow direction.
- the upstream catalytic converter 141 and the downstream catalytic converter 142 are internally provided with a three-way catalyst having an oxygen storage function, and are configured to simultaneously purify unburned components such as CO and HC and NOx in the exhaust gas. .
- the engine control device 2 includes an electronic control unit 200 (hereinafter simply referred to as “ECU 200”) that constitutes each means of the present invention.
- the ECU 200 includes a CPU 201, a ROM 202, a RAM 203, a backup RAM 204, an interface 205, and a bidirectional bus 206.
- the CPU 201, ROM 202, RAM 203, backup RAM 204, and interface 205 are connected to each other via a bidirectional bus 206.
- a routine (program) executed by the CPU 201, a table (including a lookup table and a map) referred to when the routine is executed, and the like are stored in advance.
- the RAM 203 temporarily stores data as necessary when the CPU 201 executes a routine.
- the backup RAM 204 stores data when the CPU 201 executes a routine while the power is turned on, and holds the stored data even after the power is shut off. Specifically, the backup RAM 204 stores a part of the acquired (detected or estimated) operation state parameters, a part of the above-described table, a correction (learning) result of the table, and the like so as to be overwritten. It has become.
- the interface 205 is electrically connected to operating units (the intake valve control device 125, the igniter 128, the injector 129, the throttle valve actuator 133, etc.) in the system S and various sensors described later. That is, the interface 205 transmits detection signals from various sensors to be described later to the CPU 201 and drives the operation unit described above (this is calculated by the CPU 201 based on the detection signals described above (the routine described above)). Is executed) is transmitted to the operation unit.
- operating units the intake valve control device 125, the igniter 128, the injector 129, the throttle valve actuator 133, etc.
- the system S includes a coolant temperature sensor 211, a cam position sensor 212, a crank position sensor 213, an air flow meter 214, an upstream air-fuel ratio sensor 215a, a downstream air-fuel ratio sensor 215b, a throttle position sensor 216, and an accelerator opening sensor 217, Etc. are provided.
- the cooling water temperature sensor 211 is attached to the cylinder block 11 and outputs a signal corresponding to the cooling water temperature Tw in the cylinder block 11.
- the cam position sensor 212 is attached to the cylinder head 12 and corresponds to the rotation angle of the above-described intake camshaft (not shown) (included in the intake valve control device 125) for reciprocating the intake valve 123.
- a waveform signal (G2 signal) having a pulse is output.
- the crank position sensor 213 is mounted on the cylinder block 11 and outputs a waveform signal having a pulse corresponding to the rotation angle of the crankshaft 113.
- the air flow meter 214 is attached to the intake passage 13 and outputs a signal corresponding to an intake air flow rate Ga that is a mass flow rate per unit time of intake air flowing through the intake passage 13.
- the upstream air-fuel ratio sensor 215a and the downstream air-fuel ratio sensor 215b are mounted in the exhaust passage 14.
- the upstream air-fuel ratio sensor 215a is disposed upstream of the upstream catalytic converter 141 in the exhaust flow direction.
- the downstream air-fuel ratio sensor 215b is disposed at a position downstream of the upstream catalytic converter 141 in the exhaust flow direction, specifically, a position between the upstream catalytic converter 141 and the downstream catalytic converter 142. Yes.
- the upstream air-fuel ratio sensor 216a and the downstream air-fuel ratio sensor 216b output a signal corresponding to the air-fuel ratio (oxygen concentration) of the exhaust gas that passes through the part where the upstream air-fuel ratio sensor 216a and the downstream air-fuel ratio sensor 216b are mounted.
- the upstream air-fuel ratio sensor 215a is a limiting current type oxygen concentration sensor (so-called A / F sensor), and is substantially linear with respect to a wide range of air-fuel ratios as shown in FIG. Output is generated.
- the downstream air-fuel ratio sensor 215b is an electromotive force type (concentration cell type) oxygen concentration sensor (so-called O 2 sensor), and as shown in FIG.
- the throttle position sensor 216 is disposed at a position corresponding to the throttle valve 132.
- the throttle position sensor 216 outputs a signal corresponding to the actual rotational phase of the throttle valve 132 (that is, the throttle valve opening TA).
- the accelerator opening sensor 217 outputs a signal corresponding to the operation amount (accelerator operation amount PA) of the accelerator pedal 220 by the driver.
- the ECU 200 of the present embodiment performs air-fuel ratio control of the engine 1, that is, control of the fuel injection amount (injection time) in the injector 129, based on the outputs of the upstream air-fuel ratio sensor 215a and the downstream air-fuel ratio sensor 215b.
- the fuel injection amount is fed back based on the output signal from the upstream air-fuel ratio sensor 215a so that the air-fuel ratio of the exhaust gas flowing into the upstream catalytic converter 141 becomes the target air-fuel ratio (required air-fuel ratio).
- Controlled main feedback control
- control for feeding back the output of the downstream air-fuel ratio sensor 215b to the fuel injection amount is also performed (sub-feedback control).
- sub-feedback control based on the output of the downstream air-fuel ratio sensor 215b, the air-fuel ratio of the exhaust gas flowing into the upstream catalytic converter 141, that is, the air-fuel ratio of the fuel mixture supplied to the combustion chamber CC (required air-fuel ratio). Is determined.
- FIG. 4 is a timing chart showing the contents of the control executed in this embodiment.
- “Voxs” on the lower side in FIG. 4 indicates a change over time in the output Voxs of the downstream air-fuel ratio sensor 216b
- “Request A / F” on the upper side in FIG. 4 indicates the downstream air-fuel ratio sensor shown on the lower side.
- the required air-fuel ratio set based on the output Voxs of 216b is shown.
- the required air-fuel ratio is set to the rich side based on the output Voxs of the downstream air-fuel ratio sensor 216b (rich request). During this rich request, the required air-fuel ratio is set to a value which is displaced to the rich side increases from the stoichiometric air-fuel ratio (stoichiometric) (see figure AF R).
- the rich air-fuel ratio exhaust gas flows into the upstream side catalytic converter 141.
- the three-way catalyst hereinafter simply referred to as “three-way catalyst” provided in the upstream side catalytic converter 141
- oxygen release occurs in order to purify (oxidize) the rich air-fuel ratio exhaust gas.
- the rich air-fuel ratio exhaust gas blows through the upstream catalytic converter 141, so that the output Voxs of the downstream air-fuel ratio sensor 216b is inverted from the lean side to the rich side.
- the required air-fuel ratio is set to the lean side based on the output Voxs (lean request).
- the required air-fuel ratio is set to a large value which is displaced to the lean side from the stoichiometric air-fuel ratio (see figure AF L).
- the oxygen storage rate in the three-way catalyst is increased, so that the oxygen storage function is utilized to the maximum.
- the rich spike is on standby (prohibited) until time t2 when a predetermined time has elapsed from time t1.
- the output Voxs of the downstream air-fuel ratio sensor 216b is based on a value (rich-side maximum value or rich-side extreme value) Voxs_Rmax corresponding to the rich-side amplitude centered on the target value Voxs_ref corresponding to the theoretical air-fuel ratio. Is the time when the voltage drops slightly and reaches the rich spike start value Voxs_RS.
- the rich spike is prohibited, so that the output Voxs of the downstream air-fuel ratio sensor 216b can be quickly reduced from the rich side extreme value Voxs_Rmax to reach the rich spike start value Voxs_RS. .
- the rich air-fuel ratio exhaust gas accompanying the rich spike is appropriately processed on the upstream end side in the exhaust flow direction of the three-way catalyst.
- the oxygen storage portion moves from the midstream portion in the exhaust flow direction of the three-way catalyst toward the downstream end side.
- the change in the output Voxs of the downstream air-fuel ratio sensor 216b is moderated as shown in FIG. 4, and the oxygen storage capacity of the three-way catalyst is utilized evenly.
- This rich spike is permitted until time t3 before the output Voxs of the downstream air-fuel ratio sensor 216b is inverted from the rich side to the lean side.
- the rich spike is performed once in about 0.1 to 1 second, and is executed once in 1 to 5 seconds (the same applies to the lean spike described later).
- the output Voxs and the target value of the downstream air-fuel ratio sensor 216b It is set according to the deviation ⁇ Voxs from Voxs_ref. Specifically, the rich spike interval T RS is set larger the deviation ⁇ Voxs large, is set as the deviation ⁇ Voxs small small reversed. As a result, the maximum utilization of the oxygen storage function by introducing a strong lean air-fuel ratio exhaust gas into the three-way catalyst is ensured, and the generation of transient output of the downstream air-fuel ratio sensor 216b is suppressed as much as possible.
- the rich spike interval T RS is set larger the deviation ⁇ Voxs large, is set as the deviation ⁇ Voxs small small reversed.
- the rich spike interval TRS is set according to the engine load. Specifically, the rich spike interval TRS is set smaller as the engine load is higher. At the same time, the rich spike time (duration per one rich spike) tRS is set shorter as the engine load is higher. Thereby, the optimal rich spike execution state (rich spike interval T RS and rich spike time t RS ) is maintained.
- a lean air-fuel ratio exhaust gas is introduced into the three-way catalyst for a longer time by setting the rich spike interval TRS to be large.
- the oxygen occlusion function of the three-way catalyst can be drawn out more greatly.
- a lean air-fuel ratio exhaust gas is easily introduced into the three-way catalyst. For this reason, in this region, by setting the rich spike interval TRS to be small, the displacement of the average air-fuel ratio during the lean request to the lean side is mitigated, thereby reducing emissions.
- the rich spike interval T RS and the rich spike time t RS are set according to the deterioration state of the three-way catalyst. Specifically, as the deterioration of the three-way catalyst progresses (that is, as the value of the oxygen storage capacity OSC acquired by the on-board catalyst diagnosis decreases), the rich spike interval TRS is set to be small and the rich spike time is set. t RS is set short. Thereby, emission can be reduced.
- the rich request is started.
- the required air-fuel ratio is set to a value which is displaced to the rich side increases from the stoichiometric air-fuel ratio (see figure AF R).
- the oxygen release rate in the three-way catalyst is increased, so that the oxygen storage function is utilized to the maximum extent.
- the output Voxs of the downstream air-fuel ratio sensor 216b is based on a value (lean-side maximum value or lean-side extreme value) Voxs_Lmax corresponding to the lean-side amplitude centered on the target value Voxs_ref corresponding to the theoretical air-fuel ratio. Also, the voltage rises slightly and reaches the lean spike start value Voxs_LS. As a result, the change in the output Voxs of the downstream air-fuel ratio sensor 216b is moderated as shown in FIG. 4, and the oxygen release capability of the three-way catalyst is utilized evenly. Thereafter, lean spike is permitted until time t5 before the output Voxs of the downstream air-fuel ratio sensor 216b is reversed from the lean side to the rich side.
- the lean spike interval T LS is set such that the deviation ⁇ Voxs between the output Voxs of the downstream air-fuel ratio sensor 216b and the target value Voxs_ref, the engine load, and the three-way catalyst It is set according to the deterioration state. Specifically, the lean spike interval T LS is set to be larger as the deviation ⁇ Voxs is larger, set to be smaller as the engine load is higher, and set to be smaller as the deterioration of the three-way catalyst proceeds.
- the lean spike time t LS is set according to the engine load and the deterioration state of the three-way catalyst. Specifically, the lean spike time t LS is set shorter as the engine load is higher, and is set shorter as the deterioration of the three-way catalyst proceeds.
- the request in the rich required air-fuel ratio AF R and (required air-fuel ratio in the lean spike) lean spike strength AF LS, as well as the required air-fuel ratio AF L and the rich spike intensity in the lean request (rich spike required air-fuel ratio) AF RS is set according to the engine load.
- the oxygen occlusion and release rates can be increased by setting these values to be greatly displaced from the target value Voxs_ref.
- emission can be reduced by reducing the displacement from these target values Voxs_ref.
- the catalyst stoichiometry (the stoichiometric point of the three-way catalyst: specifically, the median value of the catalyst window) is shifted to the rich side (for example, JP 2005-48711 A 2005-351250 publication etc.). Therefore, (as i.e. the intake air flow rate Ga increases) as is a high load, so shifting the catalyst stoichiometric to rich, above the required air-fuel ratio AF R, etc. and the target value Voxs_ref is set appropriately.
- step 520 Yes
- the process proceeds to step 610 and thereafter in FIG. 6 and a lean request is started.
- the required air-fuel ratio AF L in the lean request based on the engine load or the intake air flow rate Ga (by using a map or the like) is set.
- step 620 it is determined whether or not the output Voxs of the downstream air-fuel ratio sensor 216b is decreasing.
- the process does not proceed to the subsequent step 630 until the output Voxs of the downstream air-fuel ratio sensor 216b starts to decrease.
- step 620 Yes
- step 630 the output Voxs of the downstream air-fuel ratio sensor 216b falls from the rich side extreme value Voxs_Rmax to about the rich spike start value Voxs_RS as shown in FIG.
- step 640 the deviation ⁇ Voxs is obtained by subtracting the target value Voxs_ref from the current output Voxs of the downstream air-fuel ratio sensor 216b.
- the rich spike intensity AF RS , the rich spike interval T RS , and the rich spike time t RS are set based on the operating state parameter of the system S including the deviation ⁇ Voxs (steps 645 to 655). ), A rich spike is executed based on the set value and the count value of the spike control timer (step 660).
- the rich spike intensity AF RS is set based on the intake air flow rate Ga.
- the intake air flow rate Ga, the oxygen storage capacity OSC of the three-way catalyst (this is separately determined by a well-known on-board catalyst diagnosis: for example, JP-A-8-284648, JP-A-10- 311213, JP-a No. 11-125112, JP-like references.), and based on the deviation DerutaVoxs, rich spike interval T RS is set.
- the rich spike time tRS is set based on the intake air flow rate Ga and the oxygen storage capacity OSC.
- step 520 in FIG. 5 determines whether the determination in step 520 in FIG. 5 is “No”, or if step 680 in FIG. 6 has been passed (that is, if the above-described rich spike control has ended).
- step 710 the required air-fuel ratio AF R in the rich request, based on the engine load or the intake air flow rate Ga (by using a map or the like) is set.
- step 720 it is determined whether or not the output Voxs of the downstream air-fuel ratio sensor 216b is increasing. The process does not proceed to the subsequent step 730 until the output Voxs of the downstream air-fuel ratio sensor 216b starts to increase.
- step 720 Yes
- the execution of lean spike is permitted and the spike control timer is reset (step 730).
- the output Voxs of the downstream air-fuel ratio sensor 216b increases from the lean side extreme value Voxs_Lmax to about the lean spike start value Voxs_LS, as shown in FIG.
- step 740 the deviation ⁇ Voxs is obtained by subtracting the current output Voxs of the downstream air-fuel ratio sensor 216b from the target value Voxs_ref.
- the lean spike intensity AF LS , the lean spike interval T LS , and the lean spike time t LS are set (steps 745 to 755) based on the operating state parameters including the deviation ⁇ Voxs (steps 745 to 755).
- the lean spike is executed based on the set value and the spike control timer (step 760).
- step 745 the lean spike intensity AF LS is set based on the intake air flow rate Ga.
- Step 750 the intake air flow rate Ga, the oxygen storage capability OSC, and based on the deviation DerutaVoxs, lean spike interval T LS is set. Further, in step 755, the lean spike time t LS is set based on the intake air flow rate Ga and the oxygen storage capacity OSC.
- step 770 Yes
- the process proceeds to step 780, and the lean spike control is finished. Thereafter, the process proceeds to step 610 in FIG. 6, and the lean request is started again.
- the spike in the direction opposite to the direction of the required air-fuel ratio based on the output Voxs of the downstream air-fuel ratio sensor 216b is performed under appropriate conditions according to the operating state of the system S.
- the transient output (sudden change in output) of the downstream side air-fuel ratio sensor 216b is suppressed while the oxygen storage function in the three-way catalyst is used evenly.
- the downstream air-fuel ratio sensor 216b is made to have a region with the best possible response. Can be used in
- the configuration of the present embodiment is a conventional air-fuel ratio control apparatus in which the sub-feedback correction amount decreases as the deviation between the output Voxs of the downstream air-fuel ratio sensor 216b and the target value Voxs_ref corresponding to the theoretical air-fuel ratio decreases.
- the oxygen storage function of the three-way catalyst can be further utilized, and emission suppression performance is also excellent. .
- the present invention (especially, the functional elements of the constituent elements constituting the means for solving the problems of the present invention is expressed functionally or functionally) is based on the description of the above-described embodiment and the following modifications. Should not be interpreted as limited. Such a limited interpretation is unacceptable and improper for imitators, while improperly harming the applicant's interests (rushing to file under a prior application principle).
- the present invention is not limited to the specific apparatus configuration disclosed in the above embodiment.
- the present invention is applicable to gasoline engines, diesel engines, methanol engines, bioethanol engines, and any other type of internal combustion engine.
- the number of cylinders, cylinder arrangement method (series, V type, horizontally opposed), fuel supply method, and ignition method are not particularly limited.
- An in-cylinder injection valve for directly injecting fuel into the combustion chamber CC may be provided together with or instead of the injector 129 (see, for example, Japanese Patent Application Laid-Open No. 2007-278137).
- the present invention is preferably applied to such a configuration.
- the upstream air-fuel ratio sensor 216a and the downstream air-fuel ratio sensor 216b may be mounted on the casing of the upstream catalytic converter 141.
- the present invention is not limited to the specific processing mode disclosed in the above embodiment.
- an operation state parameter acquired (detected) by a certain sensor can be substituted for another operation state parameter acquired (detected) by another sensor or an on-board estimated value using this. That is, for example, in each step of FIGS. 6 and 7, the load factor KL, the throttle valve opening TA, the accelerator operation amount PA, and the catalyst bed temperature can be used instead of the intake air flow rate Ga.
- step 620 in FIG. 6 it may be determined whether or not a predetermined time has elapsed since the output Voxs of the downstream side air-fuel ratio sensor 216b is reversed from the lean side to the rich side.
- step 720 in FIG. The integrated value of the intake air flow rate Ga after the output inversion can also be used for spike start determination.
- Required air-fuel ratio AF RS in the rich spike may be set the same as the required air-fuel ratio AF R in the rich request, which may be set to the rich side than.
- the required air-fuel ratio AF LS in lean spike may be set the same as the required air-fuel ratio AF L in the lean request, which may be set to be leaner than. That, AF R and AF RS in the range of 13.5 ⁇ 14.5, AF L and AF LS is in the range of 14.7 to 15.7, can be set respectively.
- the output of the upstream side air-fuel ratio sensor 215a is in a state where the actual air-fuel ratio fluctuation has been “done” due to the influence of the response or the like.
- the downstream-side air-fuel ratio sensor 216b output Voxs and the target value deviation is small spike interval between Voxs_ref (rich spike interval T RS or lean spike interval T LS) is short, the constant of the output of the upstream air-fuel ratio sensor 215a It is better not to perform main feedback learning for correction of typical errors. That is, the main feedback learning is preferably performed when the output Voxs of the downstream side air-fuel ratio sensor 216b deviates from the target value Voxs_ref by a predetermined amount or more and the spike interval is long.
- step 820 Yes
- the process proceeds to step 830, and the rich spike interval TRS is predetermined. It is determined whether or not the value is longer than the value TRS0 (note that the rich spike interval TRS is assumed to be a large value corresponding to infinity before the rich spike control is started).
- step 820 No
- the process proceeds to step 860, and it is determined whether the lean spike interval T LS is longer than the predetermined value T LS0 (as described above).
- the lean spike interval T LS is assumed to be a large value corresponding to infinity before the start of lean spike control.
- the main feedback learning is finished. If the determination is “No” in step 830, the processes in steps 840, 850, and 890 are skipped. Similarly, when the determination in step 860 is “No”, the processes in steps 870, 880, and 890 are skipped.
- main feedback learning is permitted when the spike interval is longer than a predetermined value (see FIG. 9). Thereby, it is suppressed as much as possible that the precision of main feedback learning deteriorates under the influence of spikes.
- sub-feedback learning for correcting a steady error in the output of the downstream air-fuel ratio sensor 215b cannot be performed when the difference between the output Voxs of the downstream air-fuel ratio sensor 216b and the target value Voxs_ref is large. For this reason, the sub-feedback learning is performed when the divergence is small and the spike interval (the rich spike interval TRS and the lean spike interval TLS ) is short. Specifically, as shown in FIG. 9, when the output Voxs of the downstream air-fuel ratio sensor 216b is reversed, the target value (target voltage) is changed from Voxs_ref to Voxs_ref ′ (the output of the downstream air-fuel ratio sensor 216b. Sub-feedback learning is performed by shifting to the extreme value when Voxs is reversed.
- step 1030 the rich spike interval TRS is predetermined. It is determined whether or not the value is shorter than TRS0 .
- the progress of processing to the step 1035 is awaited (i.e., permit the sub-feedback learning is awaited.).
- step 1035 it is determined whether or not the output Voxs of the downstream air-fuel ratio sensor 216b has gone backward (ie, increased) despite the average air-fuel ratio being lean.
- step 1040 Yes
- the process proceeds to step 1050, the target voltage is rewritten from Voxs_ref to Voxs_ref ′, and sub-feedback learning ends (step 1060).
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Abstract
Description
本発明の適用対象である内燃機関システムは、内部に気筒を有する内燃機関と、排気通路(前記気筒から排出された排気の通路)に装着された排気浄化触媒及び下流側空燃比センサと、を備えている。前記排気浄化触媒は、前記気筒から排出された排気を浄化するように構成されている。前記下流側空燃比センサは、前記排気浄化触媒よりも排気流動方向における下流側の部位にて前記排気通路に装着されていて、当該部位における排気の空燃比に対応する出力を発生するようになっている。
かかる構成を備えた本発明の空燃比制御装置においては、前記下流側空燃比センサは、前記排気浄化触媒から排出された(流出してきた)排気における空燃比(酸素濃度)に対応した出力を生じる。ここで、排気が前記排気浄化触媒に流入すると、排気浄化作用(酸素の吸蔵又は放出反応)は、前記排気流動方向における上流端側(前端側あるいは排気流入側)から生じる。そして、実質的な排気浄化部位(反応部位)は、徐々に下流端側(後端側あるいは排気流出側)に向けて移動する。
図1は、本発明の適用対象である内燃機関システムS(以下、単に「システムS」と称する。例えば車両がこれに該当する。)の概略構成を示す図である。このシステムSは、ピストン往復動型の火花点火式複数気筒4サイクルエンジン1(以下、単に「エンジン1」と称する。)と、本発明の空燃比制御装置の一実施形態であるエンジン制御装置2と、を含んでいる。なお、図1には、エンジン1の特定の気筒における、気筒配列方向と直交する面による断面図が示されている。
図1を参照すると、エンジン1は、シリンダブロック11とシリンダヘッド12とを備えている。これらは、図示しないボルト等によって、互いに固定されている。また、エンジン1(具体的にはシリンダブロック11)には、吸気通路13及び排気通路14が接続されている。
吸気通路13における、エアフィルタ131と吸気ポート121との間の位置には、スロットルバルブ132が装着されている。このスロットルバルブ132は、スロットルバルブアクチュエータ133によって回転駆動されることで、吸気通路13の開口断面積を可変とするようになっている。
エンジン制御装置2は、本発明の各手段を構成する電子制御ユニット200(以下、単に「ECU200」と称する。)を備えている。ECU200は、CPU201と、ROM202と、RAM203と、バックアップRAM204と、インターフェース205と、双方向バス206と、を備えている。CPU201、ROM202、RAM203、バックアップRAM204、及びインターフェース205は、双方向バス206によって互いに接続されている。
本実施形態のECU200は、上流側空燃比センサ215a及び下流側空燃比センサ215bの出力に基づいて、エンジン1の空燃比制御、すなわち、インジェクタ129における燃料噴射量(噴射時間)の制御を行う。
図5~図7は、図1に示されているCPU201によって実行される処理の一具体例を示すフローチャートである。なお、各図のフローチャートにおいて、「ステップ」は「S」と略記されている。
以上詳述した通り、本実施形態においては、下流側空燃比センサ216bの出力Voxsがリーン側からリッチ側に反転した場合に、この出力に基づいて、要求空燃比が、理論空燃比から大きくリーン側に変位した値(リーン要求における要求空燃比AFL:図4参照)に設定される。同様に、下流側空燃比センサ216bの出力Voxsがリッチ側からリーン側に反転した場合に、この出力に基づいて、要求空燃比が、理論空燃比から大きくリッチ側に変位した値(リッチ要求における要求空燃比AFR:図4参照)に設定される。これにより、前記三元触媒における酸素の吸蔵及び放出の速度が増加し、当該触媒における酸素吸蔵機能が高められる。
なお、上述の実施形態は、上述した通り、出願人が取り敢えず本願の出願時点において最良であると考えた本発明の代表的な実施形態を単に例示したものにすぎない。よって、本発明はもとより上述の実施形態に何ら限定されるものではない。したがって、本発明の本質的部分を変更しない範囲内において、上述の実施形態に対して種々の変形が施され得ることは、当然である。
Claims (12)
- 内部に気筒を有する内燃機関と、
前記気筒から排出された排気を浄化するために排気通路に装着された、排気浄化触媒と、
前記排気浄化触媒よりも排気流動方向における下流側の部位にて前記排気通路に装着されていて、当該部位における排気の空燃比に対応する出力を発生する、下流側空燃比センサと、
を備えた内燃機関システムにおける、少なくとも前記下流側空燃比センサの出力に基づいて、前記内燃機関の空燃比を制御する、空燃比制御装置であって、
前記下流側空燃比センサの出力によって要求される空燃比補正の実施中に、制御目標空燃比よりも当該空燃比補正の方向とは逆方向に前記排気の空燃比を一時的に変化させる空燃比スパイクである逆方向スパイクを導入する、逆方向スパイク導入手段と、
前記内燃機関システムの運転状態に基づいて、時間的に隣り合う2つの前記逆方向スパイク同士の間隔である逆方向スパイク間隔を設定する、逆方向スパイク間隔設定手段と、
を備えたことを特徴とする、空燃比制御装置。 - 請求項1に記載の、空燃比制御装置において、
前記下流側空燃比センサの出力と所定の目標値との偏差を取得する、偏差取得手段をさらに備え、
前記逆方向スパイク間隔設定手段は、前記偏差に基づいて、前記逆方向スパイク間隔を設定することを特徴とする、空燃比制御装置。 - 請求項1又は請求項2に記載の、空燃比制御装置であって、
前記逆方向スパイク間隔設定手段は、前記内燃機関の負荷に基づいて、前記逆方向スパイク間隔を設定することを特徴とする、空燃比制御装置。 - 請求項3に記載の、空燃比制御装置であって、
前記逆方向スパイク間隔設定手段は、前記気筒の吸入空気量に基づいて、前記逆方向スパイク間隔を設定することを特徴とする、空燃比制御装置。 - 請求項1~請求項4のうちのいずれか1項に記載の、空燃比制御装置であって、
前記逆方向スパイク間隔設定手段は、前記排気浄化触媒の劣化状態に基づいて、前記逆方向スパイク間隔を設定することを特徴とする、空燃比制御装置。 - 請求項1~請求項5のうちのいずれか1項に記載の、空燃比制御装置において、
前記内燃機関システムの運転状態に基づいて、1回の前記逆方向スパイクあたりの継続時間である逆方向スパイク時間を設定する、逆方向スパイク時間設定手段を、さらに備えたことを特徴とする、空燃比制御装置。 - 請求項6に記載の、空燃比制御装置であって、
前記逆方向スパイク時間設定手段は、前記内燃機関の負荷に基づいて、前記逆方向スパイク時間を設定することを特徴とする、空燃比制御装置。 - 請求項6又は請求項7に記載の、空燃比制御装置であって、
前記逆方向スパイク時間設定手段は、前記排気浄化触媒の劣化状態に基づいて、前記逆方向スパイク時間を設定することを特徴とする、空燃比制御装置。 - 請求項1~請求項8のうちのいずれか1項に記載の、空燃比制御装置において、
前記気筒の吸入空気量に基づいて、1回の前記逆方向スパイクにおける空燃比変動幅である逆方向スパイク強度を設定する、逆方向スパイク強度設定手段を、さらに備えたことを特徴とする、空燃比制御装置。 - 請求項1~請求項9のうちのいずれか1項に記載の、空燃比制御装置において、
前記下流側空燃比センサの出力の定常的な誤差の補正のための学習を許可する、下流側学習条件判定手段をさらに備え、
前記下流側学習条件判定手段は、前記逆方向スパイク間隔に基づいて前記学習を許可することを特徴とする、空燃比制御装置。 - 請求項10に記載の、空燃比制御装置であって、
前記逆方向スパイクの導入中に、前記下流側空燃比センサの出力の変化の方向が、当該出力によって要求される空燃比補正の方向とは逆方向になった時点で、前記目標値を補正することによって前記学習を行うことを特徴とする、空燃比制御装置。 - 請求項1~請求項11のうちのいずれか1項に記載の、空燃比制御装置において、
前記内燃機関システムにおける前記排気浄化触媒及び前記下流側空燃比センサよりも前記排気流動方向における上流側の部位にて前記排気通路に装着されていて当該部位における排気の空燃比に対応する出力を発生する上流側空燃比センサの出力の定常的な誤差の補正のための学習を許可する、上流側学習条件判定手段をさらに備え、
前記上流側学習条件判定手段は、前記逆方向スパイク間隔に基づいて前記学習を許可することを特徴とする、空燃比制御装置。
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PCT/JP2010/065492 WO2012032631A1 (ja) | 2010-09-09 | 2010-09-09 | 空燃比制御装置 |
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JP2014122570A (ja) * | 2012-12-20 | 2014-07-03 | Nissan Motor Co Ltd | 内燃機関の制御装置 |
JP2015222046A (ja) * | 2014-05-23 | 2015-12-10 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2016031039A (ja) * | 2014-07-28 | 2016-03-07 | トヨタ自動車株式会社 | 内燃機関 |
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JP5397551B2 (ja) * | 2010-09-09 | 2014-01-22 | トヨタ自動車株式会社 | 空燃比制御装置 |
JP5464391B2 (ja) * | 2011-01-18 | 2014-04-09 | トヨタ自動車株式会社 | 内燃機関の空燃比制御装置 |
JP6579179B2 (ja) * | 2017-11-01 | 2019-09-25 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
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JP2014122570A (ja) * | 2012-12-20 | 2014-07-03 | Nissan Motor Co Ltd | 内燃機関の制御装置 |
JP2015222046A (ja) * | 2014-05-23 | 2015-12-10 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
US10132257B2 (en) | 2014-05-23 | 2018-11-20 | Toyota Jidosha Kabushiki Kaisha | Control system of internal combustion engine |
JP2016031039A (ja) * | 2014-07-28 | 2016-03-07 | トヨタ自動車株式会社 | 内燃機関 |
US10302035B2 (en) | 2014-07-28 | 2019-05-28 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP2615282B1 (en) | 2016-08-31 |
US20130231845A1 (en) | 2013-09-05 |
US9062622B2 (en) | 2015-06-23 |
EP2615282A4 (en) | 2015-02-18 |
EP2615282A1 (en) | 2013-07-17 |
JP5397551B2 (ja) | 2014-01-22 |
CN103097702A (zh) | 2013-05-08 |
CN103097702B (zh) | 2015-07-15 |
JPWO2012032631A1 (ja) | 2013-12-12 |
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