EP2530288B1 - Système de détermination de l'activation pour capteur d'oxygène - Google Patents

Système de détermination de l'activation pour capteur d'oxygène Download PDF

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Publication number
EP2530288B1
EP2530288B1 EP11185695.1A EP11185695A EP2530288B1 EP 2530288 B1 EP2530288 B1 EP 2530288B1 EP 11185695 A EP11185695 A EP 11185695A EP 2530288 B1 EP2530288 B1 EP 2530288B1
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EP
European Patent Office
Prior art keywords
oxygen sensor
output value
value
fuel supply
processing circuit
Prior art date
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EP11185695.1A
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German (de)
English (en)
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EP2530288A3 (fr
EP2530288A2 (fr
Inventor
Hirotaka Kihara
Yuuichirou Sawada
Michihisa Nakamura
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Yamaha Motor Co Ltd
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Yamaha Motor Co Ltd
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Publication of EP2530288A3 publication Critical patent/EP2530288A3/fr
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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
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • 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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • 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
    • F02D41/1456—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 with sensor output signal being linear or quasi-linear with the concentration of oxygen

Definitions

  • the present invention relates to an activation determination system for an oxygen sensor.
  • Patent Application No. US 4970858 discloses an air-fuel ratio feedback control system. After the output of the pull-up type input circuit becomes lower than an activation control level, the determination of whether or not the air-fuel ratio sensor is activated is carried out by determining whether or not the output of the pull-up type input circuit is within an active region.
  • the oxygen sensors have been so far used for appropriately controlling the air-fuel ratio of the mixture gas to be supplied to the internal combustion engine.
  • Output values from the oxygen sensor vary in accordance with concentration of oxygen in the exhaust gas. It is therefore possible to obtain the concentration of oxygen in the exhaust gas by detecting the output value from the oxygen sensor. Further, based on the output value from the oxygen sensor, estimation is executed for which of a rich state and a lean state the mixture gas to be supplied to the internal combustion engine is in.
  • a sensor using stabilized zirconia is used as the oxygen sensor as described in Japan Laid-open Patent Application Publication No. JP-A-2006-170938 .
  • the output from the oxygen sensor of a low temperature state may different from that of a high temperature state even when the air-fuel ratio is identical between the low temperature state and the high temperature state.
  • the oxygen sensor may output a value in accordance with an oxygen concentration different from the actual oxygen concentration. Therefore, it is herein difficult to appropriately control the air-fuel ratio when a feedback control is executed for the air-fuel ratio using the output value from the oxygen sensor.
  • the output value from the oxygen sensor herein converges to a predetermined convergence value in a deactivated state.
  • the well-known determining devices are configured to determine whether or not the output value from the oxygen sensor falls in a predetermined deactivation range including the convergence value in order to determine whether or not the oxygen sensor is in a deactivated state.
  • the feedback control using the output value from the oxygen sensor is configured to be stopped. It is thereby possible to avoid execution of an unsuitable control for the actual condition of the internal combustion engine.
  • the oxygen sensor is configured to output a value of representing the lean state when the fuel supply cut-off is executed in controlling the internal combustion engine. Subsequently, the output value from the oxygen sensor converges to the aforementioned convergence value when the temperature of the oxygen sensor is reduced in conjunction with reduction in temperature of the internal combustion engine. In this case, depending on settings of the deactivation range, the oxygen sensor could be in the deactivated state before the output value from the oxygen sensor reaches the aforementioned deactivation range. However, the above deactivated state of the oxygen sensor cannot be appropriately determined by the well-known methods of determining whether or not the output value from the oxygen sensor falls in the deactivation range.
  • An activation determining system for an oxygen sensor includes an oxygen sensor, a signal processing circuit, a deactivation determining section and a fuel supply cut-off determining section.
  • the oxygen sensor is configured to output a signal in accordance with an oxygen concentration in an exhaust gas from an internal combustion engine when the oxygen sensor is in an activated state.
  • the signal processing circuit is configured to receive the signal inputted thereto from the oxygen sensor.
  • the signal processing circuit is configured to output a signal in accordance with the signal inputted thereto from the oxygen sensor when the oxygen sensor is in the activated state.
  • the signal processing circuit is configured to output a signal converging to a predetermined lean output value when the oxygen sensor is in the activated state and an oxygen sensor atmosphere is maintained in the same state as the standard atmosphere.
  • the signal processing circuit is configured to output a signal converging to a predetermined convergence value different from the lean output value when the oxygen sensor is maintained in a deactivated state.
  • the deactivation determining section is configured to determine that the oxygen sensor is in the deactivated state when the output value from the signal processing circuit falls in a predetermined deactivation range including the convergence value.
  • the fuel supply cut-off determining section is configured to determine whether or not a fuel supply cut-off is currently executed in the internal combustion engine.
  • the deactivation determining section is configured to determine that the oxygen sensor is in the deactivated state when the output value from the signal processing circuit varies towards the convergence value for a predetermined period of time or longer during execution of the fuel supply cut-off or when the output value from the signal processing circuit varies towards the convergence value by a predetermined amount or greater during execution of the fuel supply cut-off.
  • the deactivation determining section is configured to determine the deactivated state of the oxygen sensor based on the amount of or the period of time of variation in the output value from the signal processing circuit.
  • the oxygen sensor atmosphere enters a state with a large oxygen partial pressure as seen in the standard atmosphere, for instance. Accordingly, the output value from the signal processing circuit does not exceed a predetermined range representing a lean state when the oxygen sensor is in the activated state during execution of the fuel supply cut-off. Therefore, it is possible to appropriately determine that the oxygen sensor is in the deactivated state by detecting that the output value from the signal processing circuit varies towards the convergence value.
  • FIG. 1 is a side view of a motorcycle 1 as a saddle-ride type vehicle according to an exemplary embodiment of the present invention.
  • crisscrossed arrows in the drawings represent respective directions.
  • Reference numerals "F”, “Rr”, “U” “Lo”, “R” and “L”, attached to the arrows, refer to "front”, “rear”, “upper”, “lower”, “right” and “left” directions, respectively.
  • the front, rear, right, left, upper and lower directions respectively refer to the directions seen from a rider seated on a seat 5.
  • the motorcycle 1 is of a scooter type.
  • the motorcycle 1 includes a vehicle body frame 2 and a power unit 3.
  • the power unit 3 is attached to the vehicle body frame 2.
  • the power unit 3 is attached to the vehicle body frame 2 while being pivotable up and down.
  • the seat 5 is disposed over the power unit 3 for allowing a rider to be seated thereon.
  • a handle unit 6 and a front wheel 7 are disposed forwards of the seat 5.
  • a foot rest 8 is disposed between the seat 5 and the handle unit 6 for allowing a rider to put his/her feet thereon.
  • a rear wheel 9 is disposed under the seat 5.
  • a rear cushion unit 10 is disposed between the power unit 3 and the vehicle body frame 2.
  • the power unit 3 includes an engine 11 and a power transmission 12.
  • the engine 11 corresponds to an internal combustion engine of the present invention.
  • the rear wheel 9 is rotatably attached to the rear portion of the power transmission 12. Driving force generated in the engine 11 is transmitted to the rear wheel 9 through the power transmission 12.
  • FIG. 2 is a side view of the power unit 3 and the rear wheel 9.
  • the rear wheel 9 is disposed rearwards of the engine 11.
  • the rear wheel 9 is disposed for aligning with the power transmission 12 in the transverse (i.e., right-and-left) direction of the motorcycle 1.
  • the engine 11 includes a crankcase 13, a cylinder body 14, a cylinder head 15 and a cylinder head cover 16.
  • the cylinder body 14 is attached to the crankcase 13.
  • the cylinder body 14 is disposed forwards of the crankcase 13.
  • the cylinder head 15 is attached to the cylinder body 14.
  • the cylinder head 15 is disposed forwards of the cylinder body 14.
  • the cylinder head cover 16 is attached to the cylinder head 15.
  • the cylinder head cover 16 is disposed forwards of the cylinder head 15.
  • An air intake duct 21 is connected to the top surface of the cylinder head 15.
  • An air cleaner 22 is connected to the air intake duct 21.
  • the air intake duct 21 forms an air intake path 31 (see FIG. 4 ) to be described. Air is supplied to a combustion chamber of the engine 11 through the air intake duct 21.
  • the cylinder head 15 includes an exhaust port 23 on the bottom surface thereof. The exhaust port 23 is protruded downwards from the bottom surface of the cylinder head 15.
  • An exhaust duct 24 is connected to the exhaust port 23.
  • a muffler 25 is connected to the exhaust duct 24.
  • the exhaust port 23 and the exhaust duct 24 form an exhaust path 36 to be described (see FIG. 4 ). Exhaust gas is discharged from the combustion chamber of the engine 11 through the exhaust duct 24.
  • a dashed dotted line A is the cylinder axis of the engine 11.
  • the cylinder axis A is tilted forwardly upwards in the longitudinal (back-and-forth) direction of the motorcycle 1.
  • each of the angles, formed by the cylinder axis A and the longitudinal direction of the motorcycle 1 is not limited to a particular angle.
  • the tilt angle of the cylinder axis A with respect to the longitudinal direction of the motorcycle 1 may be 0 degrees.
  • the cylinder axis A may be overlapped with the longitudinal direction of the motorcycle 1.
  • FIG. 3 is a front view of the vehicle body frame 2, the power unit 3 and the rear wheel 9, seen from the front side of the cylinder axis A.
  • the vehicle body frame 2 includes a pair of a left-side frame 2a and a right-side frame 2b.
  • the right and left frames 2a and 2b are disposed at a predetermined interval in the transverse direction.
  • the frames 2a and 2b are extended rearwards and upwards in a side view. Further, the frames 2a and 2b intersect with the engine 11 in a side view.
  • the power transmission 12 is disposed on the left side of the engine 11. Further, the power transmission 12 is disposed rearwards of the frames 2a and 2b.
  • the crankcase 13 is disposed rearwards of the frames 2a and 2b.
  • the rear wheel 9 is disposed rearwards of the engine 11.
  • the cylinder body 14, the cylinder head 15 and the cylinder head cover 16 are herein disposed transversely between the frames 2a and 2b for allowing the power unit 3 to pivot up and down without being interfered with by the frames 2a and 2b.
  • an oxygen sensor 40 to be described is attached to the cylinder head 15.
  • the oxygen sensor 40 is configured to detect concentration of oxygen in the exhaust gas to be discharged from the combustion chamber of the engine 11. Specifically, the oxygen sensor 40 is attached to the exhaust port 23 of the cylinder head 15.
  • FIG. 4 is a configuration diagram of the engine 11 and a control system of the engine 11.
  • the engine 11 includes a piston 26, a crankshaft 27 and a conrod (connecting rod) 28.
  • the piston 26 is movably disposed within the cylinder body 14.
  • the crankshaft 27 is rotatably disposed within the aforementioned crankcase 13.
  • the conrod 28 couples the piston 26 and the crankshaft 27.
  • the engine 11 includes a fuel injecting valve 32, an ignition device 33, an intake valve 34 and an exhaust valve 35.
  • the fuel injecting valve 32 is configured to supply fuel to a combustion chamber 29 within the cylinder head 15.
  • the fuel injecting valve 32 is disposed for injecting fuel into the air intake path 31. It should be noted that the fuel injecting valve 32 may be disposed for injecting fuel into the combustion chamber 29.
  • the fuel injecting valve 32 is connected to a fuel tank 38 through a fuel pipe 37.
  • the fuel tank 38 includes a fuel pump 39 and a fuel sensor 46 in the inside thereof.
  • the fuel pump 39 is configured to supply fuel to the fuel pipe 37.
  • the fuel sensor 46 is configured to detect the amount of fuel contained in the fuel tank 38.
  • the ignition device 33 is configured to ignite fuel contained in the combustion chamber 29.
  • the engine 11 includes a rotary speed sensor 41 and an engine temperature sensor 42.
  • the rotary speed sensor 41 is configured to detect the rotary speed of the crankshaft 27 for detecting the engine speed.
  • the engine temperature sensor 42 is configured to detect the temperature of the engine 11. It should be noted that the engine temperature sensor 42 may be configured to detect the temperature of a portion (e.g., the cylinder) of the engine 11. When the engine 11 is of a water-cooled type, the engine temperature sensor 42 may be alternatively configured to detect the temperature of a coolant of the engine 11. In other words, the engine temperature sensor 42 may be configured to directly detect the temperature of the engine 11.
  • the engine temperature sensor 42 may be configured to indirectly detect the temperature of the engine 11 through the detection of the temperature of the coolant or the like.
  • the intake valve 34 is configured to be opened or closed for connecting or disconnecting the air intake path 31 and the combustion chamber 29.
  • the exhaust valve 35 is configured to be opened or closed for connecting or disconnecting the combustion chamber 29 and the exhaust path 36.
  • the air intake path 31 is provided with an intake temperature sensor 43 and an intake pressure sensor 44.
  • the intake temperature sensor 43 is configured to detect the temperature of air to be inhaled into the combustion chamber 29 through the air intake path 31.
  • the intake pressure sensor 44 is configured to detect the intake pressure that is the internal pressure of the air intake path 31.
  • the air intake path 31 is provided with a throttle valve 51.
  • the opening degree of the throttle valve 51 is configured to be regulated for regulating the amount of air to be supplied to the combustion chamber 29 through the air intake path 31.
  • the throttle valve 51 is provided with a throttle position sensor 45 (see FIG. 5 ).
  • the throttle position sensor 45 is configured to detect the opening degree of the throttle valve 51 (hereinafter referred to as "a throttle opening degree").
  • the exhaust path 36 is provided with a catalyst 52. Further, the exhaust path 36 is provided with the oxygen sensor 40 as an air-fuel ratio sensor, as described above.
  • the oxygen sensor 40 can detect which of a rich state or a lean state the mixture gas is in.
  • the rich state herein refers to a state that the air-fuel ratio of the mixture gas is less than a theoretical air-fuel ratio thereof.
  • the lean state herein refers to a state that the air-fuel ratio of the mixture gas is greater than the theoretical air-fuel ratio thereof.
  • the oxygen sensor 40 will be described in detail in the following paragraphs.
  • the motorcycle 1 includes an ECU (Electric Control Unit) 60 configured to control the engine 11.
  • FIG. 5 is a configuration block diagram of the ECU 60.
  • the ECU 60 includes a computing portion 61, a storage portion 62, an input portion 63 and an output portion 64.
  • the computing portion 61 includes a CPU, for instance, and is configured to execute a variety of computing processing for controls to be described.
  • the storage portion 62 includes memory devices such as a ROM and a RAM, for instance, and is configured to store a variety of information and control programs for executing controls to be described.
  • Each of the input and output portions 63 and 64 includes an interface circuit.
  • the aforementioned various sensors 40 to 46 are connected to the input portion 63.
  • the input portion 63 is configured to receive a detection signal from each of the sensors 40 to 46.
  • the sensors connected to the input portion 63 include the rotary speed sensor 41, the engine temperature sensor 42, the intake temperature sensor 43, the intake pressure sensor 44, the throttle position sensor 45, the oxygen sensor 40 and the fuel sensor 46.
  • the fuel injecting valve 32 and the ignition device 33 are connected to the output portion 64.
  • the output portion 64 is configured to output a command signal to the fuel injecting valve 32 and the ignition device 33 based on the result of the computing processing executed by the computing portion 61.
  • the ECU 60 is configured to execute a variety of controls such as a control of the amount of fuel to be injected from the fuel injecting valve 32 and a control of the timing of ignition by the ignition device 33 based on the signals from the respective sensors 40 to 46. Specifically, the ECU 60 is configured to correct the period of time of opening the fuel injecting valve 32 based on the signal from the oxygen sensor 40. Accordingly, a feedback control is executed for the air-fuel ratio of the mixture gas in order to obtain a desired air-fuel ratio. It should be noted that detection accuracy of the oxygen sensor 40 is deteriorated when the temperature of the solid electrolyte element in the oxygen sensor 40 is low. In other words, the oxygen sensor 40 is in a deactivated state and detection reliability thereof is lowered when the temperature thereof is low.
  • the oxygen sensor 40 is in an activated state and detection reliability thereof is elevated when the temperature thereof is sufficiently high. It is difficult to accurately control the air-fuel ratio when a feedback control is executed for the air-fuel ratio of the mixture gas based on the signal from the oxygen sensor 40 under the condition that the oxygen sensor 40 is in the deactivated state.
  • the ECU 60 is firstly configured to determine which of the activated state and the deactivated state the oxygen sensor 40 is in. When determining that the oxygen sensor 40 is in the activated state, the ECU 60 is configured to execute the aforementioned feedback control.
  • the ECU 60 When determining that the oxygen sensor 40 is in the deactivated state, by contrast, the ECU 60 is configured to execute not the aforementioned feedback control but a feedforward control for the fuel injecting valve 32 based on the fuel injection controlling amount preliminarily stored in the storage portion 62.
  • the following explanation relates to the activation determining system for the oxygen sensor 40, i.e., the system for determining which of the deactivated state and the activated state the oxygen sensor 40 is in.
  • the activation determining system for the oxygen sensor 40 includes the oxygen sensor 40, a fuel supply cut-off determining section 65, a deactivation determining section 66 and a lean/rich determining section 67.
  • the oxygen sensor 40 is a sensor using a solid electrolyte made of, for instance, stabilized zirconia. In the activated state, the oxygen sensor 40 is configured to output a signal with a voltage value in accordance with the concentration of oxygen in the exhaust gas.
  • FIG. 6 is a schematic configuration diagram of the oxygen sensor 40 and the input portion 63. As represented in FIG. 6 , the input portion 63 includes a signal processing circuit 68 to be connected to the oxygen sensor 40. The signal processing circuit 68 is configured to receive the signal from the oxygen sensor 40.
  • the signal processing circuit 68 is a pull-up circuit and includes an input line 69 and a pull-up resistance R1.
  • the input line 69 connects the oxygen sensor 40 and the computing portion 61.
  • the input line 69 is connected to a power source Vcc, while the pull-up resistance R1 is disposed between the power source Vcc and the input line 69.
  • FIG. 7 represents an output characteristic of a signal to be outputted from the signal processing circuit 68 to the computing portion 61.
  • the vertical axis represents an output value (voltage) from the signal processing circuit 68
  • the horizontal axis represents time.
  • a solid line L1 represents a signal to be outputted from the signal processing circuit 68 when the oxygen sensor 40 is in the activated state.
  • the signal processing circuit 68 is configured to output a signal to the computing portion 61 in accordance with a signal inputted thereto from the oxygen sensor 40 when the oxygen sensor 40 is in the activated state.
  • the oxygen sensor 40 is a binary sensor.
  • the binary oxygen sensor is of a type that the output value thereof extremely varies when the rich state is changed into the lean state and vice versa.
  • the signal processing circuit 68 is configured to output a signal with an output value converging towards a predetermined rich output value VR when the mixture gas is in the rich state.
  • the signal processing circuit 68 is configured to output a signal with an output value converging towards a predetermined lean output value VL when the mixture gas is in the lean state. Therefore, the signal processing circuit 68 is configured to output a signal with an output value converging to the lean output value VL when the oxygen sensor 40 is in the activated state and the atmosphere of the oxygen sensor 40 is simultaneously maintained in the same state as the standard atmosphere.
  • the rich output value VR is greater than the lean output value VL.
  • the lean output value VL is 0 volts.
  • a broken line L2 represents a signal to be outputted from the signal processing circuit 68 when the oxygen sensor 40 is in the deactivated state.
  • the signal processing circuit 68 is configured to output a signal with an output value converging to a predetermined convergence value VP when the oxygen sensor 40 is in the deactivated state.
  • the signal processing circuit 68 is a pull-up circuit.
  • An internal resistance R0 of the oxygen sensor 40 is locally maximized when the oxygen sensor 40 is in the deactivated state.
  • the signal processing circuit 68 is herein configured to output a signal with a predetermined pull-up voltage to be produced by the pull-up resistance R1 and the power source Vcc in the signal processing circuit 68.
  • an output value from the signal processing circuit 68 converges to the predetermined pull-up voltage greater than 0 volts when the oxygen sensor 40 is in the deactivated state.
  • the aforementioned convergence value VP thus corresponds to the pull-up voltage.
  • the pull-up voltage is an intermediate value between the lean output value VL and the rich output value VR.
  • the pull-up voltage is greater than the lean output value VL and is less than the rich output value VR.
  • the convergence value VP is different from the lean output value VL.
  • the oxygen sensor 40 is herein so-called a heater-less sensor, and is not equipped with a heater for heating the aforementioned element.
  • the exhaust gas from the engine 11 functions as a heat source for heating the element of the oxygen sensor 40. Therefore, the oxygen sensor 40 is in the deactivated state when the temperature of the exhaust gas from the engine 11 is lowered. When the oxygen sensor 40 is in the deactivated state, the output value from the signal processing circuit 68 converges towards the convergence value VP.
  • the lean/rich determining section 67, the fuel supply cut-off determining section 65 and the deactivation determining section 66 are included in the aforementioned computing portion 61.
  • the computing portion 61 is configured to execute a function as the lean/rich determining section 67, a function as the fuel supply cut-off determining section 65 and a function as the deactivation determining section 66.
  • the fuel supply cut-off determining section 65 is configured to determine whether or not fuel supply cut-off is currently executed for the engine 11. For example, the fuel supply cut-off determining section 65 is configured to determine whether or not the fuel supply cut-off is currently executed for the engine 11 based on a command signal to the fuel injecting valve 32. Alternatively, the fuel supply cut-off determining section 65 may be configured to determine whether or not the fuel supply cut-off is currently executed for the engine 11 based on the engine speed and the throttle opening degree. It should be noted that the fuel supply cut-off is configured to be executed when a single or plurality of predetermined conditions for executing the fuel supply cut-off is satisfied during travelling of the motorcycle 1.
  • An exemplary condition for executing the fuel supply cut-off is that the engine speed becomes greater than or equal to a predetermined speed, and simultaneously, the throttle opening degree is less than or equal to a predetermined opening degree.
  • the fuel supply cut-off is stopped and the normal operation is executed again when a single or plurality of predetermined conditions for stopping the fuel supply cut-off is satisfied during execution of the fuel supply cut-off.
  • An exemplary condition for stopping the fuel supply cut-off is that the engine speed becomes less than or equal to a predetermined speed. Accordingly, engine stalls are prevented.
  • an exemplary condition for stopping the fuel supply cut-off may be that the throttle opening degree becomes greater than or equal to a predetermined degree. Accordingly, the fuel supply cut-off can be stopped in response to a rider' s demand for acceleration.
  • the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the deactivated state when the output value from the signal processing circuit 68 falls in a predetermined deactivation range during execution of the normal operation, i.e., during non-execution of the fuel supply cut-off.
  • the predetermined deactivation range Rna includes the aforementioned convergence value VP.
  • the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the deactivated state when the output value from the signal processing circuit 68 falls in the deactivation range Rna for a predetermined period of time or longer during non-execution of the fuel supply cut-off.
  • the predetermined deactivation range Rna is a range between a first activation determining value V1 and a second activation determining value V2.
  • the first activation determining value V1 is an intermediate value between the lean output value VL and the convergence value VP.
  • the first activation determining value V1 is greater than the lean output value VL and is less than the convergence value VP.
  • the second activation determining value V2 is an intermediate value between the rich output value VR and the convergence value VP.
  • the second activation determining value V2 is less than the rich output value VR and is greater than the convergence value VP. Further, the second activation determining value V2 is greater than the first activation determining value V1.
  • An appropriate value for accurately determining whether or not the oxygen sensor 40 is in the deactivated state has been preliminarily obtained through experiments, simulations and/or the like, and is herein set as each of the first and second activation determining values V1 and V2.
  • the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the deactivated state when the output value from the signal processing circuit 68 is greater than or equal to the first activation determining value V1 and is simultaneously less than or equal to the second activation determining value V2.
  • the temperature of the exhaust gas is lowered, for instance, in a low temperature environment or when the engine 11 is idled while the temperature thereof is lowered because of rain. In such situations, the temperature of the oxygen sensor 40 is lowered and enters the deactivated state even during non-execution of the fuel supply cut-off.
  • a range between the lean output value VL and the first activation determining value V1 will be hereinafter referred to as "a first activation range Ra1”.
  • the aforementioned range between the rich output value VR and the second activation determining value V2 will be hereinafter referred to as "a second activation range Ra2”.
  • the deactivation range Rna is set between the first activation range Ra1 and the second activation range Ra2.
  • the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the activated state when the output value from the signal processing circuit 68 falls in the first activation range Ra1 for a predetermined period of time or longer during execution of the normal operation. Further, the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the activated state when the output value from the signal processing circuit 68 falls in the second activation range Ra2 for a predetermined period of time or longer during execution of the normal operation.
  • An appropriate period of time for determining the activated state of the oxygen sensor 40 has been preliminarily obtained through experiments, simulations and/or the like, and is herein set as the predetermined period of time.
  • the lean/rich determining section 67 is configured to compare the output value from the signal processing circuit 68 with a predetermined determining threshold VA under the condition that the oxygen sensor 40 is determined to be in the activated state in order to determine which of the lean state and the rich state the mixture gas is in. Specifically, the lean/rich determining section 67 is configured to determine that the mixture gas is in the lean state when the output value from the signal processing circuit 68 is less than or equal to the predetermined determining threshold VA under the condition that the oxygen sensor 40 is determined to be in the activated state.
  • the lean/rich determining section 67 is configured to determine that the mixture gas of the engine 11 is in the rich state when the output value from the oxygen sensor 40 is greater than or equal to the predetermined determining threshold VA under the condition that the oxygen sensor 40 is determined to be in the activated state.
  • the determining threshold VA is an intermediate value between the first activation range Ra1 and the second activation range Ra2. Therefore, the determining threshold VA falls in the deactivation range Rna.
  • the deactivation determining section 66 is configured to execute a deactivation determining processing represented in FIG. 8 when the fuel supply cut-off determining section 65 determines that the fuel supply cut-off of the engine 11 is currently executed.
  • an output value Vd (n) from the signal processing circuit 68 (hereinafter simply referred to as "an output value Vd(n) ") is loaded in the deactivation determining section 66.
  • Loading of the output value Vd (n) is configured to be repeated at predetermined cycles as described below.
  • the output value Vd (n) is configured to be loaded at a cycle that a calculation for the feedback control is executed based on the output value Vd (n) .
  • “n” represents frequency of calculations for the feedback control. Specifically, “n” is set to be 1 in the first calculation. Likewise, “n” is set to be 2 in the second calculation.
  • FIG. 9 is an exemplary time chart representing variation in the output value Vd(n) when the fuel supply cut-off is executed.
  • the oxygen sensor 40 In a time period from a point-of-time to to a point-of-time t1, the oxygen sensor 40 is in the activated state while the mixture gas is in the rich state. Therefore, the output value Vd(n) falls in the second activation range Ra2.
  • the atmosphere of the oxygen sensor 40 becomes similar to the standard atmosphere with a large oxygen partial pressure. In other words, the atmosphere of the oxygen sensor 40 becomes the lean state when the fuel supply cut-off is executed. Therefore, the output value Vd(n) is reduced and falls in the first activation range Ra1 at the point-of-time t1 and thereafter.
  • Step S2 it is determined whether or not the output value Vd(n) is less than a bottom output value Vbottom.
  • the processing proceeds to Step S3 when the output value Vd(n) is less than the bottom output value Vbottom.
  • Step S3 the output value Vd(n) is set as the bottom output value.
  • the processing then returns to Step S1. It should be noted that the output value Vd (n) is set as the bottom output value Vbottom in the first calculation without execution of Steps S2 and S3.
  • the bottom output value Vbottom is updated to the newly loaded output value Vd(n) when the output value Vd (n) is continuously reduced (from the point-of-time t1 to a point-of-time t2) after the onset of the fuel supply cut-off as represented in FIG. 9 .
  • Step S4 when it is determined in Step S2 that the output value Vd(n) is greater than or equal to the bottom output value Vbottom.
  • the output value Vd(n) is herein reduced to the minimum (at the point-of-time t2) after the onset of the fuel supply cut-off. In other words, the output value Vd(n) reaches the lean output value VL. The minimum of the output value Vd(n) is then set as the bottom output value Vbottom. In FIG. 9 , the minimum of the output value Vd(n) is equal to the lean output value VL. However, the minimum of the output value Vd(n) may be greater than the lean output value VL.
  • Step S4 it is determined whether or not a difference between the output value Vd(n) and the bottom output value Vbottom is greater than or equal to a predetermined threshold Vth. As represented in FIG. 9 , it is herein determined whether or not an increase dV from the minimum of the output value Vd (n) is greater than or equal to the predetermined threshold Vth.
  • the processing returns to Step S1 when the difference between the output value Vd(n) and the bottom output value Vbottom is not greater than or equal to the predetermined threshold Vth.
  • the processing proceeds to Step S5 when the difference between the output value Vd(n) and the bottom output value Vbottom is greater than or equal to the predetermined threshold Vth.
  • Step S5 it is determined that the oxygen sensor 40 is in the deactivated state. Specifically, it is determined that the oxygen sensor 40 is in the deactivated state when the increase dV from the minimum of the output value Vd(n) becomes greater than or equal to the predetermined threshold Vth (at a point-of-time t3) as represented in FIG. 9 . That is to say, it is determined that the oxygen sensor 40 is in the deactivated state when the output value Vd(n) varies towards the convergence value VP by a predetermined amount or greater during execution of the fuel supply cut-off.
  • the oxygen sensor 40 is in the deactivated state when the output value Vd (n) varies towards the convergence value VP by a predetermined amount or greater from a value most deviating from the convergence value VP during execution of the fuel supply cut-off. Further put differently, it is determined that the oxygen sensor 40 is in the deactivated state when the output value Vd(n) varies towards the convergence value VP by a predetermined amount or greater from a value as a turning point from a trend deviating from the convergence value VP to a trend converging to the convergence value VP during execution of the fuel supply cut-off.
  • a value for appropriately determining that the oxygen sensor 40 enters the deactivated state during execution of the fuel supply cut-off has been preliminarily obtained through experiments, simulations and/or the like, and is herein set as the predetermined threshold Vth.
  • the predetermined threshold Vth is less than the first activation determining value V1.
  • the predetermined threshold Vth is an intermediate value between the lean output value VL and the first activation determining value V1.
  • the output value Vd(n) and the bottom output value Vbottom are configured to be reset at the end of the fuel supply cut-off.
  • the activation determining system for the oxygen sensor 40 has the following features.
  • the deactivation determining section 66 is configured to determine the deactivation state of the oxygen sensor 40 based on the increase dV from the minimum of the output value Vd(n) after the onset of the fuel supply cut-off.
  • the output value Vd(n) is not increased from the minimum when the oxygen sensor 40 is in the activated state during execution of the fuel supply cut-off.
  • a signal with thus increasing output value Vd (n) is not continuously outputted during execution of the fuel supply cut-off when the oxygen sensor 40 is in the activated state. Therefore, it is possible to appropriately determine that the oxygen sensor 40 is in the deactivated state by detecting that the output value Vd(n) is increased towards the convergence value VP.
  • the feedback control can be herein executed as long as possible, compared to the configuration of determining the deactivated state of the oxygen sensor 40 and stopping the feedback control immediately after execution of the fuel supply cut-off. Exhaust deterioration can be thereby inhibited. Yet further, cost increase can be herein inhibited, compared to a structure that a device such as an operational amplifier is added to the input portion 63 of the ECU 60 in order to enhance accuracy in the activation determination for the oxygen sensor 40.
  • the predetermined threshold Vth to be used in the determination during execution of the fuel supply cut-off is an intermediate value between the lean output value VL and the first activation determining value V1. Therefore, it is possible to determine that the oxygen sensor 40 is in the deactivated state at an earlier stage of a condition that the oxygen sensor 40 is possibly in the deactivated state during execution of the fuel supply cut-off, compared to the configuration of using the same threshold for both the deactivation determination during execution of the normal control and that during execution of the fuel supply cut-off.
  • the fuel supply cut-off may be executed during travelling of the motorcycle 1.
  • the deactivation determination for the oxygen sensor 40 can be executed well in advance during travelling of the motorcycle 1 because the deactivated state of the oxygen sensor 40 is determined at an early stage during execution of the fuel supply cut-off as described above.
  • the fuel supply cut-off may be executed during travelling of the vehicle. Therefore, it may be determined that the oxygen sensor 40 is in the deactivated state during travelling of the vehicle due to execution of the fuel supply cut-off.
  • the signal processing circuit 68 is a pull-up circuit. Therefore, the output value Vd(n) converges towards the convergence value VP when the oxygen sensor 40 is in the deactivated state. It is possible to appropriately determine that the oxygen sensor 40 is in the deactivated state by detecting such variation in the output value Vd(n).
  • the oxygen sensor 40 is a binary sensor. Therefore, the output value Vd(n) is not increased from the minimum after the onset of the fuel supply cut-off when the oxygen sensor 40 is in the activated state during execution of the fuel supply cut-off. Therefore, it is possible to appropriately determine that the oxygen sensor 40 is in the deactivated state by detecting variation in the output value Vd(n) as described above.
  • the present invention is especially effective for the heater-less oxygen sensor 40.
  • the saddle-ride type vehicle is not limited to the aforementioned motorcycle, and may be other vehicles such as the all-terrain vehicles or the snowmobiles. Further, the motorcycle is not limited to the aforementioned scooter, and may be other motorcycles such as the mopeds or the sport-type motorcycles.
  • the lean output value VL is less than the rich output value VR. As represented in FIG. 10 , however, the lean output value VL may be greater than the rich output value VR. In other words, the output value Vd(n) of the aforementioned exemplary embodiment may be herein vertically turned upside down. In this case, it is determined that the oxygen sensor 40 is in the deactivated state when a reduction dV from the maximum of the output value Vd(n) becomes greater than the predetermined threshold Vth.
  • the signal processing circuit 68 is not limited to the pull-up circuit and may be a pull-down circuit represented in FIG. 11 .
  • the signal processing circuit 68 represented in FIG. 11 includes the input line 69 and a pull-down resistance R2.
  • the input line 69 connects the oxygen sensor 40 and the computing portion 61.
  • the input line 69 is connected to a ground G, while the pull-down resistance R2 is disposed between the ground G and the input line 69.
  • the output value Vd (n) from the signal processing circuit 68 converges to 0 V.
  • the predetermined convergence value of the present invention is herein set to be 0 V.
  • the lean output value VL is herein required to be different from 0 V. This is because the deactivated state of the oxygen sensor 40 is determined by variation in the output value Vd(n) from the lean output value VL to the convergence value VP.
  • the oxygen sensor 40 is not limited to the binary sensor and may be a linear sensor. Specifically, the oxygen sensor 40 may be a sensor of a type configured to linearly output a value in accordance with the oxygen concentration in the activated state.
  • the signal processing circuit 68 may be integrated with the oxygen sensor 40 without being included in the input portion 63 of the ECU 60.
  • a smoothing processing may be executed for the loaded output value Vd(n).
  • the smoothing processing herein refers to a processing of averaging the output value Vd(n).
  • the deactivation determining section 66 is configured to determine that the oxygen sensor 40 is in the deactivated state when the increase dV of the output value Vd(n) becomes greater than or equal to the predetermined threshold Vth during execution of the fuel supply cut-off.
  • the deactivation determining section 66 may be configured to determine that the oxygen sensor 40 is in the deactivated state when the output value Vd(n) is continuously increased for a predetermined period of time or longer during execution of the fuel supply cut-off. Specifically, as represented in FIG.
  • the deactivation determining section 66 may be configured to determine that the oxygen sensor 40 is in the deactivated state when a period-of-time dt of continuous increase in the output value Vd(n) becomes a predetermined period of time or longer.
  • FIG. 13 is a flowchart representing the deactivation determining processing corresponding to the above configuration.
  • a variable Tm is reset to 0.
  • the variable Tm represents frequency that increase in the output value Vd(n) is consecutively detected as described in the following paragraphs.
  • Steps S11 to S13 are the same as Steps S1 to S3 in the aforementioned exemplary embodiment. In short, it is detected that the output value Vd(n) reaches the minimum after the onset of the fuel supply cut-off.
  • Step S14 it is determined whether or not the output value Vd(n) is greater than a previously detected output value Vd(n-1).
  • the processing proceeds to Step S15 when the output value Vd(n) is greater than the previously detected output value Vd(n-1).
  • Step S15 1 is added to the variable Tm.
  • the consecutively detected frequency of increase in the output value Vd(n) is herein counted after the output value Vd(n) reaches the minimum.
  • Step S16 it is determined whether or not the variable Tm is greater than or equal to a predetermined threshold Tth.
  • the processing proceeds to Step S11 and the output value Vd(n) is loaded again when the variable Tm is not greater than or equal to the predetermined threshold Tth.
  • the processing returns to Step S10 and the variable Tm is reset to 0 when it is determined that the output value Vd(n) is not greater than the previously detected output value Vd(n-1).
  • Step S17 it is determined that the oxygen sensor 40 is in the deactivated state. In other words, it is determined that the oxygen sensor 40 is in the deactivated state when the consecutively detected frequency of increase in the output value Vd(n) becomes greater than or equal to the predetermined threshold Tth. It should be noted that a value for appropriately determining that the oxygen sensor 40 enters the deactivated state during execution of the fuel supply cut-off has been preliminarily obtained through experiments, simulation and/or the like, and is herein set as the predetermined threshold Tth.
  • the deactivation determining section 66 may be configured to determine that the oxygen sensor 40 is in the deactivated state when the output value Vd(n) continuously varies towards the convergence value VP for a predetermined period of time or longer during execution of the fuel supply cut-off.
  • the deactivation determining section 66 may be configured to determine that the oxygen sensor 40 is in the deactivated state when the output value Vd (n) continuously varies towards the convergence value VP from a value most deviating from the convergence value VP for a predetermined period of time or longer during execution of the fuel supply cut-off. Further put differently, the deactivation determining section 66 may be configured to determine that the oxygen sensor 40 is in the deactivated state when the output value Vd(n) continuously varies towards the convergence value VP from a value as a turning point from a trend deviating from the convergence value VP to a trend converging to the convergence value VP for a predetermined period of time or longer during execution of the fuel supply cut-off.
  • the consecutively detected frequency of increase in the output value Vd(n) is used as the information for representing the period of time of continuous increase in the output value Vd(n).
  • a timer may be configured to directly count the period of time of continuous increase in the output value Vd(n).
  • the output value Vd(n) may be vertically turned upside down as represented in FIG. 14 . In this case, it is determined that the oxygen sensor 40 is in the deactivated state when a period-of-time dt of continuous reduction in the output value Vd (n) from the maximum becomes a predetermined period-of-time or longer.
  • monitoring of increase in the output value Vd(n) is started from the onset of execution of the fuel supply cut-off.
  • monitoring of increase in the output value Vd(n) may be started after a predetermined period of time elapses from the onset of execution of the fuels supply cut-off.
  • the aforementioned determination of the deactivated state for the oxygen sensor may be started after a predetermined period-of-time dt elapses from a point-of-time t1 corresponding to the onset of execution of the fuel supply cut-off.
  • a signal of representing the rich state is outputted until the exhaust gas reaches the oxygen sensor from the timing recognized by the ECU regarding the onset of execution of the fuel supply cut-off. Because of this, a signal of representing the rich state is outputted in spite of lack of fuel injection immediately after the onset of execution of the fuel supply cut-off. Another reason is response delay of the oxygen sensor. Yet another reason is that the fuel adhered to the intake port enters the combustion chamber during execution of the fuel supply cut-off and combustion is herein executed. In this case, a signal of representing the rich state is similarly outputted in spite of lack of fuel injection immediately after the onset of execution of the fuel supply cut-off. Even when the aforementioned phenomena occur, wrong determination can be prevented by starting the aforementioned determination of the deactivated state for the oxygen sensor after a predetermined period of time elapses from the onset of execution of the fuel supply cut-off.
  • an activation determining system for an oxygen sensor for appropriately determining a deactivated state of the oxygen sensor and simultaneously for inhibiting exhaust deterioration.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Claims (11)

  1. Système de détermination d'activation pour un capteur d'oxygène (40) comprenant :
    un capteur d'oxygène (40) configuré pour délivrer en sortie un signal en fonction de la concentration en oxygène dans les gaz d'échappement d'un moteur à combustion interne (11) lorsque le capteur d'oxygène (40) est dans un état activé ;
    un circuit de traitement de signal (68) configuré pour recevoir le signal qui lui est appliqué en entrée depuis le capteur d'oxygène (40), le circuit de traitement de signal (68) étant configuré pour fournir en sortie un signal en fonction du signal qui lui est appliqué en entrée depuis le capteur d'oxygène (40) lorsque le capteur d'oxygène (40) est dans l'état activé, le circuit de traitement de signal (68) étant configuré pour fournir en sortie un signal convergeant vers une valeur de sortie pauvre prédéterminée (VL) lorsque le capteur d'oxygène (40) est dans l'état activé et l'atmosphère du capteur d'oxygène est maintenue dans le même état que l'atmosphère standard, le circuit de traitement de signal (68) étant configuré pour fournir en sortie un signal convergeant vers une valeur de convergence prédéterminée (VP) différente de la valeur de sortie pauvre (VL) lorsque le capteur d'oxygène (40) est maintenu dans un état désactivé ; et
    une section de détermination de désactivation (66) configurée pour déterminer que le capteur d'oxygène (40) est dans l'état désactivé lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) se trouve dans une plage de désactivation prédéterminée (Rna) incluant la valeur de convergence (VP) ;
    caractérisé en ce que
    le système de détermination d'activation comprend en outre une section de détermination de coupure d'alimentation en carburant (65) configurée pour déterminer si une coupure d'alimentation en carburant dans le moteur à combustion interne (11) est ou non en cours d'exécution,
    la section de détermination d'activation (66) est configurée pour déterminer que le capteur d'oxygène (40) est dans l'état désactivé lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) varie vers la valeur de convergence (VP) pendant une période supérieure ou égale à une période de temps prédéterminé (Tth) pendant l'exécution de la coupure d'alimentation en carburant ou lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) varie vers la valeur de convergence (VP) d'une quantité supérieure ou égale à une quantité prédéterminée (Vth) pendant l'exécution de la coupure d'alimentation en carburant.
  2. Système de détection d'activation pour un capteur d'oxygène (40) selon la revendication 1, dans lequel le circuit de traitement de signal (68) comporte un circuit de rappel vers le niveau haut (68) et la valeur de convergence (VP) est une valeur de tension de rappel vers le niveau haut du circuit de rappel vers le niveau haut (68).
  3. Système de détection d'activation pour un capteur d'oxygène (40) selon la revendication 1, dans lequel le circuit de traitement de signal (68) comporte un circuit de rappel vers le niveau bas (68) et la valeur de convergence (VP) est une valeur de tension de rappel vers le niveau bas du circuit de rappel vers le niveau bas (68).
  4. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 3, dans lequel le capteur d'oxygène (40) est un capteur binaire.
  5. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 3, dans lequel le capteur d'oxygène (40) est un capteur linéaire.
  6. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 5, dans lequel la section de détermination de désactivation (66) est configurée pour déterminer que le capteur d'oxygène (40) est dans l'état désactivé lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) se trouve dans la plage de désactivation (Rna) pendant une période supérieure ou égale à une période de temps prédéterminée pendant la non exécution de la coupure d'alimentation en carburant.
  7. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 6, dans lequel le capteur d'oxygène (40) est un capteur sans élément chauffant.
  8. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 7, dans lequel la section de détermination de désactivation (66) est configurée pour déterminer que le capteur d'oxygène (40) est dans l'état désactivé lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) varie vers la valeur de convergence (VP) depuis une valeur s'écartant le plus de la valeur de convergence (VP) d'une quantité supérieure ou égale à une quantité prédéterminée pendant l'exécution de la coupure d'alimentation en carburant.
  9. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 8, dans lequel la section de détermination de désactivation (66) est configurée pour déterminer que le capteur d'oxygène (40) est dans l'état désactivé lorsque la valeur de sortie (Vd(n)) du circuit de traitement de signal (68) varie vers la valeur de convergence (VP) d'une quantité supérieure ou égale à une quantité prédéterminée depuis une valeur en tant que point de rotation depuis une tendance s'écartant de la valeur de convergence (VP) jusqu'à une tendance convergeant vers la valeur de convergence (VP) pendant l'exécution de la coupure d'alimentation en carburant.
  10. Système de détection d'activation pour un capteur d'oxygène (40) selon l'une des revendications 1 à 9, dans lequel la section de détermination de désactivation (66) est configurée pour commencer la détermination de l'état désactivé du capteur d'oxygène (40) pendant l'exécution de la coupure d'alimentation en carburant lorsqu'une période de temps prédéterminé s'est écoulée depuis le début de l'exécution de la coupure d'alimentation en carburant.
  11. Véhicule à monture à selle comprenant : le système de détermination d'activation pour un capteur d'oxygène (40) selon l'une quelconque des revendications 1 à 10.
EP11185695.1A 2011-05-31 2011-10-19 Système de détermination de l'activation pour capteur d'oxygène Active EP2530288B1 (fr)

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JP2015129442A (ja) * 2014-01-06 2015-07-16 ヤマハ発動機株式会社 鞍乗型車両
JP6112619B2 (ja) * 2014-09-18 2017-04-12 本田技研工業株式会社 Ｏ２センサの故障診断装置
JP6379000B2 (ja) * 2014-10-01 2018-08-22 日本特殊陶業株式会社 ガスセンサシステム
JP2022030600A (ja) * 2020-08-07 2022-02-18 川崎重工業株式会社 排気センサの異常検出装置

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JPS5946350A (ja) * 1982-09-09 1984-03-15 Toyota Motor Corp 内燃機関の空燃比制御方法
DE3319432A1 (de) * 1983-05-28 1984-11-29 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und einrichtung zur regelung des betriebsgemisches einer brennkraftmaschine
JPS60212650A (ja) * 1984-04-04 1985-10-24 Toyota Motor Corp 電子制御式燃料噴射装置
US4970858A (en) * 1988-03-30 1990-11-20 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback system having improved activation determination for air-fuel ratio sensor
JP2745754B2 (ja) * 1990-01-23 1998-04-28 トヨタ自動車株式会社 酸素センサの活性判定装置
US5392643A (en) * 1993-11-22 1995-02-28 Chrysler Corporation Oxygen heater sensor diagnostic routine
JP2004340859A (ja) * 2003-05-19 2004-12-02 Hitachi Unisia Automotive Ltd 酸素センサの活性化判定方法
JP2006112420A (ja) * 2004-09-17 2006-04-27 Hitachi Ltd 空燃比制御装置及び排気センサの活性状態判定装置
CN100462535C (zh) * 2004-09-17 2009-02-18 株式会社日立制作所 排气传感器激活判断和空气燃料比率控制系统/方法
JP4477481B2 (ja) 2004-12-20 2010-06-09 本田技研工業株式会社 酸素濃度センサの取付構造
JP2010025077A (ja) * 2008-07-24 2010-02-04 Mikuni Corp 内燃機関の空燃比制御装置及び空燃比制御方法

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EP2530288A3 (fr) 2014-10-29
EP2530288A2 (fr) 2012-12-05

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