CN100462535C - Exhaust gas sensor activation judgment and air fuel ratio control system/method - Google Patents
Exhaust gas sensor activation judgment and air fuel ratio control system/method Download PDFInfo
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- CN100462535C CN100462535C CNB2005101039955A CN200510103995A CN100462535C CN 100462535 C CN100462535 C CN 100462535C CN B2005101039955 A CNB2005101039955 A CN B2005101039955A CN 200510103995 A CN200510103995 A CN 200510103995A CN 100462535 C CN100462535 C CN 100462535C
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Abstract
An air fuel ratio control system includes an exhaust gas sensor to sense an oxygen concentration in an exhaust passage of an internal combustion engine, and a controller. The controller is configured to judge that the exhaust gas sensor is in an active state, by monitoring a decrease of an output of the exhaust gas sensor from a level greater than a first predetermined value, to a level smaller than or equal to the predetermined first predetermined value, and to allow the air fuel ratio control when the exhaust gas sensor is judged to be in the active state.
Description
Technical field
The present invention relates to be used for according to coming the device and/or the process of the air fuel ratio of controlling combustion engine, and relate to the device and/or the process of the activation that is used to detect exhaust sensor by the oxygen content that exhaust sensor sensed of the exhaust passage that is deployed in internal-combustion engine.
Background technique
The Japanese patent application S58 (1983)-that has announced No. 193454 (=DE33 05 699 A1) illustrate a kind of oxygen sensor, and this sensor can be used as the exhaust sensor of the air fuel ratio control system of internal-combustion engine.This sensor is accurate reference electrode type, it without atmosphere as standard electrode.The oxygen sensor of this type comprises the circuit that is clipped in the solid electrolyte film between anode and the negative electrode and is used for applying bias voltage between anode and negative electrode.Oxygen content is by coming sensing being applied under bias voltage and the controlled state of oxygen partial pressure the potential difference of measuring between two electrodes between two electrodes.
Summary of the invention
But, for example, when solid electrolyte film in the cold starting engine operation is in the impedance of inactive state and solid electrolyte film when higher, being applied between anode and the negative electrode of bias voltage produces potential difference, thereby the judgement that tends to lead to errors, think that air fuel ratio is plentiful with regard to stoichiometry, so that air fuel ratio is plentiful/poorly judge distortion.
Therefore, an object of the present invention is to provide air fuel ratio control system, device and/or method, be used to improve the validity of plentiful/poor validity of judging and air fuel ratio control.Another object of the present invention provides exhaust gas sensor activation and judges system, device and/or method, is used for accurately detecting the activation of exhaust sensor.
According to a method of the present invention, a kind of air fuel ratio control system comprises: an exhaust sensor, and it is deployed in the exhaust passage of internal-combustion engine and is arranged to senses oxygen concentration; An actuator, it is arranged to according to carried out air fuel ratio control by the oxygen concentration of exhaust sensor institute sensing; And controller, it is configured to be reduced to the rank that is less than or equal to the first predetermined predetermined value by the output that monitors exhaust sensor from the rank greater than first predetermined value and judges that exhaust sensor is in active state, and be judged as at exhaust sensor and be in the active state, allow air fuel ratio control.
According to a further aspect in the invention, the air fuel ratio control procedure comprises: first procedure division, its oxygen concentration according to the exhaust of the internal-combustion engine that senses are carried out the air fuel ratio control of internal-combustion engine; Second procedure division, it is reduced to the rank that is less than or equal to this first predetermined value by the output that monitors this exhaust sensor from the rank greater than first predetermined value, checks whether this exhaust sensor is in active state; And the 3rd procedure division, it is judged as to be at this exhaust sensor and allows air fuel ratio control in the active state.
According to a further aspect in the invention, a kind of exhaust gas sensor activation judgment means, be used for detecting the active state of the exhaust sensor of the exhaust passage that will be deployed in internal-combustion engine, comprise: controller, it is configured to monitor that the exhaust sensor output voltage is reduced to below the bias voltage that is applied to exhaust sensor, when sensor output voltage is equal to or less than first voltage, produce the active state signal of the active state of representing exhaust sensor.
Description of drawings
Fig. 1 is the schematic representation that the internal-combustion engine with air fuel ratio according to an embodiment of the invention is shown.
Fig. 2 illustrates the flow chart of air fuel ratio control procedure according to an embodiment of the invention.
Fig. 3 illustrates the plotted curve of variation that increases the sensor output voltage of exhaust sensor along with sensor temperature, and this variation is that the control system by Fig. 1 is monitored.
Fig. 4 is the flow chart that the exhaust gas sensor activation deterministic process in first example of the embodiment shown in Fig. 1 and 2 is shown.
Fig. 5 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Fig. 4 changes.
Fig. 6 is the flow chart that the exhaust gas sensor activation deterministic process in second example of Fig. 1 and 2 illustrated embodiment is shown.
Fig. 7 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Fig. 6 changes.
Fig. 8 is the flow chart that the exhaust gas sensor activation deterministic process in the 3rd example of Fig. 1 and 2 illustrated embodiment is shown.
Fig. 9 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Fig. 8 changes.
Figure 10 is the flow chart that the exhaust gas sensor activation deterministic process in the 4th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 11 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 10 changes.
Figure 12 is the flow chart that the exhaust gas sensor activation deterministic process in the 5th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 13 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 12 changes.
Figure 14 is the flow chart that the exhaust gas sensor activation deterministic process in the 6th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 15 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 14 changes.
Figure 16 is the flow chart that the exhaust gas sensor activation deterministic process in the 7th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 17 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 16 changes.
Figure 18 is the flow chart that the exhaust gas sensor activation deterministic process in the 8th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 19 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 18 changes.
Figure 20 is the flow chart that the exhaust gas sensor activation deterministic process in the 9th example of Fig. 1 and 2 illustrated embodiment is shown.
Figure 21 illustrates the plotted curve that time of the exhaust sensor output voltage of the activation deterministic process that is used for illustration Figure 20 changes.
Embodiment
Fig. 1 illustrates air fuel ratio control system according to an embodiment of the invention.As shown in fig. 1, internal-combustion engine (or engine system) 1 comprises with the bottom as primary clustering: at least one cylinder 5, cylinder 5 comprise suction valve 2, outlet valve 3 and spark plug 4; Be deployed in the fuel injector (or Fuelinjection nozzle) 7 in the suction port 6; Exhaust sensor 8 is used for the oxygen concentration in sensing exhaust passage 9 or the relief opening; And control unit 10, be used to control the operation of suction valve 2 and outlet valve 3, spark plug 4 and fuel injector 7.Fuel injector 7 can serve as the actuator in the air fuel ratio control system, and control unit 10 can serve as the formant of the controller in the air fuel ratio control system.
The engine temperature of temperature transducer or engine temperature sensing unit 11 sensing motors 1 or motor ambient temperature, for example engineer coolant temperature, lubricating oil temperature or ambient air temperature.The engine load of load transducer or engine load sensor 12 sensing motors 1, for example throttle opening of motor 1. the engine speed of velocity transducer or engine speed sensor 13 sensing motors 1.These sensors are connected with control unit 10, and are arranged to the information about the power operation situation that senses is offered control unit 10.
Fig. 2 illustrates the air fuel ratio control procedure of being carried out by control unit 10.By this air fuel ratio control procedure, plentiful accurately-poor judgement that control system can be made, and accurately control air fuel ratio.When the ignition switch of vehicle was opened, the air fuel ratio control procedure began.
In first step S1, control unit 10 reads the information about the operating conditions that is sensed by Sensor section.In this example, Sensor section comprises temperature transducer 11, load transducer 12 and velocity transducer 13.According to motor ambient temperature, engine load and the engine speed by sensor 11,12 and 13 sensings, control system is determined required target air-fuel ratio rate.
Among the step S2 after S1, control unit 10 will read corresponding to the controlling value of the information that obtains among the S1 (will mention after a while), and make judgement about the activation of exhaust sensor 8 according to controlling value.Generally speaking, when exhaust sensor is in inactive state, under the situation of not considering air fuel ratio, the output voltage VO 2 of exhaust sensor is substantially equal to bias voltage. along with the growth of the temperature of sensor, output voltage VO 2 moves closer to plentiful side output (about 900 millivolts) and poor side output (100 millivolts), shown in the downward outlined arrow among Fig. 3.On the other hand, after engine start, the air fuel ratio of internal-combustion engine just is in plentiful state.Therefore, as what will mention after a while, whether the plentiful time output of control unit 10 by checking exhaust sensor 8 with regard to stoichiometry in the scope in the active state on plentiful side (left side of being seen among Fig. 3), determine whether exhaust sensor 8 is activated.
After activation in S2 was judged, control unit 10 advanced to next step S3.In S3, control unit 10 is checked the result that the activation of S2 is judged, and checks whether exhaust sensor 8 is in active state, and whether the execution of air fuel ratio control is allowed to.When exhaust sensor 8 was in the control of inactive state and air fuel ratio and is not allowed to, control unit 10 turned back to S1 from S3.When exhaust sensor 8 was in the control of active state and air fuel ratio and is allowed to, control unit 10 advanced to step S4, to carry out air fuel ratio control.
In S4, control unit 10 is carried out the plentiful/poor judgement of air fuel ratio according to the output value of exhaust sensor 8, and carries out air fuel ratio control, so that air fuel ratio becomes the target air-fuel ratio rate.After the air fuel ratio control operation in S4, control unit 10 returns S1.
Fig. 4,6,8,10,12,14,16,18 and 20 is flow charts that nine examples judging according to the activation of this embodiment's of the present invention S2 are shown.
The activation deterministic process of first example shown in the flow chart of Fig. 4 begins after controlling value (predetermined value of mentioning after a while) is set by the operation of S1.
In the S11 shown in Fig. 4, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to second predetermined value (value 2).Second predetermined value is the interior value of output area that is in the exhaust sensor 8 in the active state.For example, second predetermined value equals the 750[millivolt].When output voltage VO 2 during less than second predetermined value, control unit 10 advances to step S15 from S11.When output voltage VO 2 during more than or equal to second predetermined value, control unit 10 advances to step S12. from S11
In S12, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value (value 1) is greater than second predetermined value, as shown in Figure 5.First predetermined value is to be in the plentiful side of the exhaust sensor 8 in the active state or the value in the plentiful time output area. for example, first predetermined value equals the 1100[millivolt].When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S13 from S12, and activation tagging (or activating judge mark) fLIGHOFF and time counter CNT_RHCHn are set to 0.Activation tagging (or activate judge mark) fLIGHTOFF is a conditional code, and when exhaust sensor 8 is in the active state, it equals 1, and when exhaust sensor 8 was in inactive state, it equaled 0.Activate and judge that it is 0 that fLIGHTOFF is reset when engine start.Time counter CNT_RICHn is the counter that is used for measuring the endurance of the output in the scope of the active state that is in exhaust sensor 8.After S13, control unit 10 stops the process of Fig. 4.When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S14 from S12.Control unit 10 resets to 0 with time counter CNT_RICHn in S14, advance to step S16 then.
In S15, control unit 10 increases progressively (increasing 1) time counter CNT_RICHn (CNT_RICHn=CNT_RICHn-1+1).After S15, control unit 10 advances to S16.
In S16, whether 10 review time of control unit counter cnt _ RICHn is more than or equal to the very first time (time 1).In this example, the very first time (time 1) is set to 10 (corresponding to the 100[millisecond]).When time counter during less than the very first time, control unit 10 stops the process of Fig. 4.When time counter during more than or equal to the very first time, control unit 10 advances to step S17 from S16.
In S17, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.After S17, control unit 10 stops the process of Fig. 4.
As shown in Figure 5, in first example of Fig. 4, control system by check sensor output voltage VO2 from greater than the range of first predetermined value to the scope that is less than or equal to first predetermined value, detect the activation of exhaust sensor 8.When exhaust sensor is in inactive state, generally speaking, between two electrodes, form potential difference owing to bias voltage.Along with exhaust sensor is activated and impedance reduces, this potential difference becomes less.Therefore, by the activation deterministic process of Fig. 4, the air fuel control system can accurately detect the activation of exhaust sensor 8, thereby by accurately detecting the plentiful side and the poor side of air fuel ratio, improves the validity of air fuel ratio control.
In the activation deterministic process of Fig. 4, control system checks that exhaust sensor output voltage VO 2 is reduced to below first predetermined value, checks that then exhaust sensor output voltage VO 2 further is reduced to below second predetermined value less than first predetermined value.Therefore, the activation of exhaust sensor can accurately be detected.
By checking that sensor output voltage VO2 remains on the endurance in the default activity output area, control system can be avoided activating the reliability of judging owing to the instantaneous erroneous judgement that reduces to cause of sensor output voltage is disconnected thereby improve.
In S21 shown in Figure 6, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of second example is to be in the plentiful side of the exhaust sensor 8 in the active state or the value in the plentiful time output area.For example, first predetermined value of second example shown in Figure 6 equals the 1100[millivolt].When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S23 from S21.When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S22 from S21.
In step 22, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF.In first example, activation tagging (or activating judge mark) fLIGHTOFF is a conditional code, and it is set to 1 to indicate exhaust sensor 8 to be activated.After S22, control unit 10 stops the process of Fig. 6.
In S23, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.After S23, control unit 10 stops the process of Fig. 6.
Thereby as shown in Figure 7, the control system of second example can change to the rank that is lower than first predetermined value from the rank that is higher than first predetermined value by checking sensor output voltage VO2, detects the activation of exhaust sensor 8.
Fig. 8 illustrates the 3rd example. and after controlling value was set by the operation of S1, the activation deterministic process shown in the flow chart of Fig. 8 was from step S31.
In S31 shown in Figure 8, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 3rd example is to be in value in the plentiful side output area of the exhaust sensor 8 in the active state (for example 1100[millivolt]).When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S33 from S31.When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S32 from S31.
In S32, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF.In addition, in S32, control unit 10 resets to 0 with plentiful time counter CNT_RICHn.Time counter CNT_RICHn is the counter that is used for measuring the endurance of the output in the activity output area of the active state that is in exhaust sensor 8.After S32, control unit 10 stops the process of Fig. 8.
In S33, control unit 10 increases progressively (increasing 1) time counter CNT_RICHn.After S33, control unit 10 advances to step S34.
In S34, whether 10 review time of control unit counter cnt _ RICHn is more than or equal to the very first time (time 1).In this example, the predetermined very first time (time lag) equals 10 (corresponding to 100 milliseconds).As time counter cnt _ RICHn during less than predetermined very first time (time 1), control unit 10 stops the process of Fig. 8.As time counter cnt _ RICHn during more than or equal to predetermined very first time (time 1), control unit 10 advances to step S35 from S34.
In S35, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.After S35, control unit 10 stops the process of Fig. 8.
Thereby, as shown in Figure 9, the control system of the 3rd example can by check sensor output voltage VO2 from the range that is higher than first predetermined value to the scope that is lower than first predetermined value, and remain in endurance in the default activity output area by further detecting sensor output voltage VO 2, detect the activation of exhaust sensor 8 more accurately.
Figure 10 illustrates the 4th example.After controlling value was set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 10 was from step S41.
In S41 shown in Figure 10, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 4th example is to be in value in the plentiful time output area of the exhaust sensor 8 in the active state (for example 1100[millivolt]).When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S43. when output voltage VO 2 during more than or equal to first predetermined value from S41, and control unit 10 advances to step S42. from S41
In S42, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF.After S42, control unit 10 stops the process of Figure 10.
In S43, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to second predetermined value (value 2).Second predetermined value of the 4th example of Figure 10 (value 2) is less than first predetermined value (value 1), as shown in figure 11.For example, second predetermined value of the 4th example equals the 750[millivolt].When output voltage VO 2 during more than or equal to second predetermined value, control unit 10 stops the process of Figure 10.When output voltage VO 2 during less than second predetermined value, control unit 10 advances to step S44 from S43.
In S44, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.After S44, control unit 10 stops the process of Fig. 8.
Figure 12 illustrates the 5th example. and after controlling value was set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 12 was from step S51.
In S51 shown in Figure 12, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 5th example is to be in value in the plentiful time output area of the exhaust sensor 8 in the active state (for example 1100[millivolt]), as shown in figure 13.When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S52 from S51.On the other hand, when output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S53 from S51.
In S52, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF, movable output judge mark fRICHOK and poor each that export among the judge mark fLEANOK.Output judge mark (or plentiful mark) fRICHOK is a conditional code, and it equals 1 during less than first value when the output voltage VO 2 of exhaust sensor 8, and it equals 0 when the output voltage VO 2 of exhaust sensor 8 is equal to or greater than first value.When engine start, it is 0 that output judge mark fRICHOK is reset.Poor output judge mark (or poor mark) fLEANOK is a conditional code, and it equals 1 during less than predetermined the 3rd value when the output voltage VO 2 of exhaust sensor 8, and it equals 0 when the output voltage VO 2 of exhaust sensor 8 is equal to or greater than the 3rd value.When engine start, it is 0 that poor output judge mark fLEANOK is reset.After S52, control unit 10 stops the process of Figure 12.
In S53, control unit 10 is exported judge mark fRICHOK and is set to 1.After S53, control unit 10 advances to step S54.
In S54, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to the 3rd predetermined value (value 3).The 3rd predetermined value of the 5th example of Figure 12 (value 3) is less than first predetermined value (value 1), as shown in figure 13.The 3rd predetermined value of the 5th example is the interior value (poor side value or low value) of poor side output area that is in the exhaust sensor 8 in the active state.For example, the 3rd predetermined value of the 5th example equals the 200[millivolt].When output voltage VO 2 during more than or equal to the 3rd predetermined value, control unit 10 directly advances to step S56 from S54.When output voltage VO 2 during less than the 3rd predetermined value, control unit 10 advances to step S55 from S54.
In S55, control unit 10 poornesss are exported judge mark fLEANOK and are set to 1.After S55, control unit 10 advances to S56.
In S56, control unit 10 checks whether output judge mark fRICHOK equals 1.When output judge mark fRICHOK was not equal to 1, control unit 10 stopped the process of Figure 12.When output judge mark fRICHOK equaled 1, control unit 10 advanced to step S57 from S56.
In S57, control unit 10 checks whether poor output judge mark fLEANOK equals 1.When poorness output judge mark fLEANOK was not equal to 1, control unit 10 stopped the process of Figure 12.When several EANOK of poorness output judge mark equaled 1, control unit 10 advanced to step S58 from S57.
In S58, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.Behind S58, control unit 10 stops the process of Figure 12.
Figure 14 illustrates the 6th example.After controlling value was set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 14 was from step S61.
In S61 shown in Figure 14, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 6th example is to be in value in plentiful time of the exhaust sensor 8 in the active state or the plentiful side output area (for example 1100[millivolt]).When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S62 from S61.On the other hand, when output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S63 from S61.
In S62, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF, movable output judge mark fRICHOK and poor each that export among the judge mark fLEANOK.Movable output judge mark (or plentiful mark) fRICHOK is a conditional code, and it equals 1 during less than first value when the output voltage VO 2 of exhaust sensor 8, and it equals 0 when the output voltage VO 2 of exhaust sensor 8 is equal to or greater than first value.When engine start, it is 0 that movable output judge mark fRICHOK is reset.Poor output judge mark (or poor mark) fLEANOK is a conditional code, and it equals 1 during less than predetermined the 3rd value when the output voltage VO 2 of exhaust sensor 8, and it equals 0 when the output voltage VO 2 of exhaust sensor 8 is equal to or greater than the 3rd value.When engine start, it is 0 that poor output judge mark fLEANOK is reset.After S62, control unit 10 stops the process of Figure 14.
In S63, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to second predetermined value (value 2).Second predetermined value of the 6th example of Figure 14 (value 2) is less than first predetermined value (value 1), as shown in figure 15.For example, second predetermined value of the 6th example equals the 900[millivolt].When output voltage VO 2 during more than or equal to second predetermined value, control unit 10 advances to step S64 from S63.When output voltage VO 2 during less than second predetermined value, control unit 10 advances to step S65 from S63.
In S64, control unit 10 is exported judge mark fRICHOK and is set to 1.After S64, control unit 10 advances to S67.
In S65, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to the 3rd predetermined value (value 2).The 3rd predetermined value of the 6th example of Figure 14 (value 3) is less than second predetermined value (value 2), as shown in figure 15.For example, the 3rd predetermined value of the 6th example equals the 200[millivolt].When output voltage VO 2 during more than or equal to the 3rd predetermined value, control unit 10 advances to step S67 from S65.When output voltage VO 2 during less than the 3rd predetermined value, control unit 10 advances to step S66 from S65.
In S66, control unit 10 poornesss are exported judge mark fLEANOK and are set to 1.After S66, control unit 10 advances to S67.
In S67, whether control unit 10 Survey Operations output judge mark fRICHOK equals 1.When output judge mark fRICHOK was not equal to 1, control unit 10 stopped the process of Figure 14.When output judge mark fRICHOK equaled 1, control unit 10 advanced to step S68 from S67.
In S68, control unit 10 checks whether poor output judge mark fLEANOK equals 1.When poorness output judge mark fLEANOK was not equal to 1, control unit 10 stopped the process of Figure 14.When poorness output judge mark fLEANOK equaled 1, control unit 10 advanced to step S69. from S68
In S69, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.Behind S69, control unit 10 stops the process of Figure 14.
Figure 16 illustrates the 7th example.After controlling value was set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 16 was from step S71.
In S71 shown in Figure 16, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 7th example is to be in value in the plentiful side output area of the exhaust sensor 8 in the active state (for example 1100[millivolt]).When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S72 from S71.On the other hand, when output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S73 from S71.
In S72, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF, movable output judge mark fRICHOK and poor each that export among the judge mark fLEANOK.Several IGHTOFF of activation tagging (or activate judge mark) are conditional codes, and it is set to 1 and is activated with indication exhaust sensor 8, in first example.Movable output judge mark fRICHOK is a conditional code, when the output voltage VO 2 of exhaust sensor 8 is equaling or is being longer than predetermined lasting time (the predetermined very first time (time lag), when continuing to be in the activity output area in the time time 1), it is set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the activity output area in the time of (time 1), it was set to 0; And when engine start, it is reset is 0.Poor output judge mark fLEANOK is a conditional code, and when the output voltage VO 2 of exhaust sensor 8 was equaling or is being longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (the second predetermined time, time 2), it was set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (time 2), it was set to 0; And when engine start, it is reset is 0.After S72, control unit 10 stops the process of Figure 16.
In S73, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to the 3rd predetermined value (value 3).The 3rd predetermined value of the 7th example of Figure 16 (value 3) is less than first predetermined value (value 1), as shown in figure 17.For example, the 3rd predetermined value of the 7th example equals the 200[millivolt].When output voltage VO 2 during less than the 3rd predetermined value, control unit 10 advances to step S77 from S73.When output voltage VO 2 during more than or equal to the 3rd predetermined value, control unit 10 advances to step S74 from S73.
In S74, control unit 10 increases progressively (increase 1) time counter CNT_RICHn, and this time counter is the endurance that is used for measuring when exhaust sensor 8 the is in active state output of the activity in the activity output area.After S74, control unit 10 advances to step S75.
In S75, whether 10 review time of control unit counter cnt _ RICHn is more than or equal to the predetermined very first time (time lag) (time 1).In this example, the predetermined very first time equals 10 (corresponding to 100 milliseconds).As plentiful time counter CNT_RICHn during less than predetermined very first time (time 1), control unit 10 advances to step S80. as time counter cnt _ RICHn during more than or equal to predetermined very first time (time 1) from S75, and control unit 10 advances to step S76 from S75.In S76, control unit 10 activities are exported judge mark fRICHOK and are set to 1.Behind S76, control unit 10 advances to S80.
In S77, control unit 10 increases progressively (increase 1) poor time counter CNT_LEANn, and this time counter is the endurance that is used for measuring when exhaust sensor 8 the is in active state poor side output in the poor activity output area.After S77, control unit 10 advances to step S78.
In S78, whether 10 review time of control unit counter cnt _ LEANn is more than or equal to predetermined second time (time 2).In this example, predetermined second time (time lag) equals 10 (corresponding to 100 milliseconds).As poor time counter CNT_LEANn during less than predetermined second time (time 2), control unit 10 advances to step S80 from S78.As time counter cnt _ LEANn during more than or equal to predetermined second time (time 2), control unit 10 advances to step S79 from S78.In S79, control unit 10 poornesss are exported judge mark fLEANOK and are set to 1.Behind S79, control unit 10 advances to S80.
In S80, whether control unit 10 Survey Operations output judge mark fRICHOK equals 1.When output judge mark fRICHOK was not equal to 1, control unit 10 stopped the process of Figure 16.When plentiful output judge mark fRICHOK equaled 1, control unit 10 advanced to step S81 from S80.
In S81, control unit 10 checks whether poor output judge mark fLEANOK equals 1.When poorness output judge mark fLEANOK was not equal to 1, control unit 10 stopped the process of Figure 16.When poorness output judge mark fLEANOK equaled 1, control unit 10 advanced to step S82 from S81.
In S82, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.Behind S82, control unit 10 stops the process of Figure 16.
Figure 18 illustrates the 8th example of judging according to the activation of the S2 of present embodiment of the present invention.
After controlling value is set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 18 from.
In S91 shown in Figure 180, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 8th example is the interior value of plentiful side output area that is in the exhaust sensor 8 in the active state, and for example, first predetermined value of the 8th example shown in Figure 180 equals the 1100[millivolt].When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S93 from S91.When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S92. from S91
In S92, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF, activity (plentiful) output judge mark fRICHOK and poor each that export among the judge mark fLEANOK.Activation tagging (or activate judge mark) fLIGHTOFF is a conditional code, and it is set to 1 and is activated with indication exhaust sensor 8, in first example.Movable output judge mark fRICHOK is a conditional code, and when the output voltage VO 2 of exhaust sensor 8 was equaling or is being longer than predetermined lasting time and continues to be in the sphere of activities in the time of (the predetermined very first time (time lag), time 1), it was set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the sphere of activities in the time of (time 1), it was set to 0; And when engine start, it is reset is 0.Several EANOK of poor output judge mark are conditional codes, and when the output voltage VO 2 of exhaust sensor 8 was equaling or is being longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (the second predetermined time, time 2), it was set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (time 2), it was set to 0; And when engine start, it is reset is 0.After S92, control unit 10 stops the process of Figure 18.
In S93, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to second predetermined value (value 2).Second predetermined value of the 8th example of Figure 18 (value 2) is less than first predetermined value (value 1), as shown in figure 19.For example, second predetermined value of the 8th example equals the 900[millivolt].When output voltage VO 2 during less than second predetermined value, control unit 10 advances to step S97 from S93.When output voltage VO 2 during more than or equal to second predetermined value, control unit 10 advances to step S94 from S93.
In S94, control unit 10 increases progressively (increase 1) movable output time counter cnt _ RICHn, and this time counter is the endurance that is used for measuring the output in the activity output area when exhaust sensor 8 is in active state.After S94, control unit 10 advances to step S95.
In S95, whether 10 review time of control unit counter cnt _ RICHn is more than or equal to the predetermined very first time (time lag) (time 1).In this example, the predetermined very first time equals 10 (corresponding to 100 milliseconds).As time counter cnt _ RICHn during less than predetermined very first time (time 1), control unit 10 advances to step S101 from S25.As time counter cnt _ RICHn during more than or equal to predetermined very first time (time 1), control unit 10 advances to step S96 from S95.In S96, control unit 10 activities are exported judge mark fRICHOK and are set to 1.Behind S96, control unit 10 advances to S101.
Among the S97 that arrives from S93, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to the 3rd predetermined value (value 3).The 3rd predetermined value of the 8th example of Figure 18 (value 3) is less than second predetermined value (value 2), as shown in figure 19.For example, the 3rd predetermined value of the 8th example equals the 200[millivolt].When output voltage VO 2 during more than or equal to the 3rd predetermined value, control unit 10 advances to step S101 from S97.When output voltage VO 2 during less than the 3rd predetermined value, control unit 10 advances to step S98 from S97.
In S98, control unit 10 increases progressively (increasing 1) poor time counter CNT_LEANn, this time counter is the endurance that is used for measuring when exhaust sensor 8 is in active state poor side output in the poor activity output area. after S98, control unit 10 advances to step S99.
In S99, control unit 10 checks that whether poor time counter CNT_LEANn is more than or equal to predetermined second time (time 2).In this example, the second predetermined time equals 10 (corresponding to 100 milliseconds).As poor time counter CNT_LEANn during less than predetermined second time (time 2), control unit 10 advances to step S101 from S99.As poor time counter CNT_LEANn during more than or equal to predetermined second time (time 2), control unit 10 advances to step S100 from S99.In S100, control unit 10 poornesss are exported judge mark fLEANOK and are set to 1.Behind S100, control unit 10 advances to S101.
In S101, control unit 10 checks whether output judge mark fRICHOK equals 1.When output judge mark fRICHOK was not equal to 1, control unit 10 stopped the process of Figure 18.When output judge mark fRICHOK equaled 1, control unit 10 advanced to step S102 from S101.
In S102, control unit 10 checks whether poor output judge mark fLEANOK equals 1.When poorness output judge mark fLEANOK was not equal to 1, control unit 10 stopped the process of Figure 18.When poorness output judge mark fLEANOK equaled 1, control unit 10 advanced to step S103 from S102.
In S103, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.Behind S103, control unit 10 stops the process of Figure 18.
As discussed above, by the activation deterministic process of Figure 18, the endurance of the output in the control system Survey Operations state range, and the endurance of the poor side output in the scope that activates.Therefore, control system can improve reliability and the validity that sensor activation is judged.
Figure 20 illustrates the 9th example of judging according to the activation of the S2 of present embodiment of the present invention.
After controlling value is set by the operation of S1, the activation deterministic process shown in the flow chart of Figure 20 from.
In S111 shown in Figure 20, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to first predetermined value (value 1).First predetermined value of the 9th example is the interior value of plentiful side output area that is in the exhaust sensor 8 in the active state, and for example, first predetermined value of the 9th example shown in Figure 20 equals the 1100[millivolt].When output voltage VO 2 during less than first predetermined value, control unit 10 advances to step S113 from S111.When output voltage VO 2 during more than or equal to first predetermined value, control unit 10 advances to step S112 from S111.
In S112, control unit 10 resets to 0 with activation tagging (or activating judge mark) fLIGHOFF, movable output judge mark fRICHOK and poor each that export among the judge mark fLEANOK.Activation tagging (or activate judge mark) fLIGHTOFF is a conditional code, and it is set to 1 and is activated with indication exhaust sensor 8, in first example.Movable output judge mark fRICHOK is a conditional code, when the output voltage VO 2 of exhaust sensor 8 is equaling or is being longer than predetermined lasting time (the predetermined very first time (time lag), when continuing to be in the activity output area in the time time 1), it is set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the plentiful side the sphere of activities in the time of (time 1), it was set to 0; And when engine start, it is reset is 0.Poor output judge mark fLEANOK is a conditional code, and when the output voltage VO 2 of exhaust sensor 8 was equaling or is being longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (the second predetermined time, time 2), it was set to 1; When the output voltage VO 2 of exhaust sensor 8 was failed equaling or is longer than predetermined lasting time and continues to be in the poor side the sphere of activities in the time of (time 2), it was set to 0; And when engine start, it is reset is 0.After S112, control unit 10 stops the process of Figure 20.
In S113, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to second predetermined value (value 2).Second predetermined value of the 9th example of Figure 20 (value 2) is less than first predetermined value (value 1), as shown in figure 21.For example, second predetermined value of the 9th example equals the 900[millivolt].When output voltage VO 2 during less than second predetermined value, control unit 10 advances to step S114 from S113.When output voltage VO 2 during more than or equal to second predetermined value, control unit 10 directly advances to step S121 from S113.
In S114, control unit 10 checks that whether the output voltage VO 2 of exhaust sensor 8 is more than or equal to the 3rd predetermined value (value 3).The 3rd predetermined value of the 9th example of Figure 20 (value 3) is less than second predetermined value (value 2), as shown in figure 21.For example, the 3rd predetermined value of the 9th example equals the 200[millivolt].When output voltage VO 2 during more than or equal to the 3rd predetermined value, control unit 10 advances to step S115 from S114.When output voltage VO 2 during less than the 3rd predetermined value, control unit 10 advances to step S118 from S114.
In S115, control unit 10 increases progressively (increase 1) movable output time counter cnt _ RICHn, and this time counter is the endurance that is used for measuring when exhaust sensor 8 the is in active state output of the activity in the activity output area.After S115, control unit 10 advances to step S116.
In S116, whether control unit 10 Survey Operations time counter CNT_RICHn are more than or equal to the predetermined very first time (time lag) (time 1).In this side, the predetermined very first time equals 10 (corresponding to 100 milliseconds).As activity time counter cnt _ RICHn during less than predetermined very first time (time 1), control unit 10 advances to step S121 from S116.As activity time counter cnt _ RICHn during more than or equal to predetermined very first time (time 1), control unit 10 advances to step S117 from S116.In S117, control unit 10 activities are exported judge mark fRICHOK and are set to 1.Behind S117, control unit 10 advances to S121.
In S118, control unit 10 increases progressively (increase 1) poor time counter CNT_LEANn, and this time counter is the endurance that is used for measuring when exhaust sensor 8 the is in active state poor side output in the poor activity output area.After S118, control unit 10 advances to step S119.
In S119, control unit 10 checks that whether poor time counter CNT_LEANn is more than or equal to predetermined second time (time 2).In this example, the second predetermined time equals 10 (corresponding to 100 milliseconds).As poor time counter CNT_LEANn during less than predetermined second time (time 2), control unit 10 advances to step S121 from S119.As poor time counter CNT_LEANn during more than or equal to predetermined second time (time 2), control unit 10 advances to step S120 from S119.In S120, control unit 10 poornesss are exported judge mark fLEANOK and are set to 1.Behind S120, control unit 10 advances to S121.
In S121, whether control unit 10 Survey Operations output judge mark fRICHOK equals 1.When output judge mark fRICHOK was not equal to 1, control unit 10 stopped the process of Figure 20.When activity output judge mark fRICHOK equaled 1, control unit 10 advanced to step S122 from S121.
In S122, control unit 10 checks whether poor output judge mark fLEANOK equals 1.When poorness output judge mark fLEANOK was not equal to 1, control unit 10 stopped the process of Figure 20.When poorness output judge mark fLEANOK equaled 1, control unit 10 advanced to step S123 from S122.
In S123, control unit 10 activates (judgement) mark fLIGHTOFF and is set to 1, is in active state with indication exhaust sensor 8.Behind S123, control unit 10 stops the process of Figure 20.
A kind of oxygen sensor that can be used among the present invention shown in U.S. Patent Application Publication US 2003/0213692A1 number.Here will comprise to come in about the explanation and the accompanying drawing of this oxygen sensor by reference.
The application is based on second formerly Japanese patent application 2005-240112 number that submits in Japan in the Japanese patent application formerly 2004-271866 number submitted in Japan on September 17th, 2004 and on August 22nd, 2005.Here by reference the full content of these Japanese patent applications 2004-271866 number and 2005-240112 number is comprised to come in.
Though below, the invention is not restricted to the foregoing description by having described the present invention with reference to some embodiment of the present invention.Those skilled in the art can expect modifications and variations to the foregoing description according to above instruction.Scope of the present invention limits with reference to appending claims.
Claims (15)
1. air fuel ratio control system comprises:
An exhaust sensor, it is deployed in the exhaust passage of an internal-combustion engine, and is set to senses oxygen concentration;
An actuator, it is set to according to carried out an air fuel ratio control by the described oxygen concentration of described exhaust sensor institute sensing; And
A controller, it is configured to output by monitoring described exhaust sensor and is reduced to the rank that is less than or equal to described predetermined first predetermined value from the rank greater than one first predetermined value and judges that described exhaust sensor is in the active state, and be judged as when being in the described active state at described exhaust sensor, allow described air fuel ratio control;
Wherein said controller is configured to after the output of described exhaust sensor is reduced under described first predetermined value, in the output of described exhaust sensor when the rank greater than one second predetermined value is reduced to the rank that is less than or equal to described second predetermined value, judge that described exhaust sensor is in described active state, wherein said second predetermined value is less than described first predetermined value;
Wherein said second predetermined value is a value outside the poor output area of the output of described exhaust sensor when described exhaust sensor is in the described active state on poor side;
Wherein said controller is configured to output when described exhaust sensor between described first and second predetermined values time, judges that described exhaust sensor is not in described active state.
2. air fuel ratio control system as claimed in claim 1, wherein said controller is configured to judge that described exhaust sensor is in the described active state when the output of described exhaust sensor is being longer than or equal to continue to be less than or equal in time of a scheduled time length described first predetermined value.
3. air fuel ratio control system as claimed in claim 1 or 2, wherein said controller is configured to judge that described exhaust sensor is in the described active state when the output of described exhaust sensor is being longer than or equal to continue to be less than or equal in time of a scheduled time length described second predetermined value.
4. air fuel ratio control system as claimed in claim 1, wherein said exhaust sensor comprises a standard electrode and a reference electrode, placed a solid electrolyte therebetween, and described exhaust sensor is arranged to and applies a bias voltage between described standard electrode and described reference electrode, and an electromotive force that produces according to the difference between the oxygen partial pressure of oxygen partial pressure that relies on described standard electrode and described reference electrode comes the described oxygen concentration of sensing.
5. air fuel ratio control system as claimed in claim 1, wherein said controller is configured to the output of described exhaust sensor is compared with one the 3rd predetermined value, and judge that described exhaust sensor is in the described active state when the output of described exhaust sensor becomes when being less than or equal to described the 3rd predetermined value, wherein said the 3rd predetermined value is set at outside the plentiful output area of output of the described exhaust sensor in the described active state.
6. air fuel ratio control system as claimed in claim 5, wherein said controller is configured to judge that described exhaust sensor is in the described active state when the output of described exhaust sensor is being longer than or equal to continue to be less than or equal in time of a preset time length described the 3rd predetermined value.
7. air fuel ratio control system as claimed in claim 1 or 2, wherein said first predetermined value are when described exhaust sensor is in the described active state on plentiful side, a value in the plentiful output area of the output of described exhaust sensor.
8. air fuel ratio control system as claimed in claim 1 or 2, wherein said controller are configured to according to the serviceability of described motor described first predetermined value and second predetermined value are set.
9. as claim 5 or 6 described air fuel ratio control system, wherein said the 3rd predetermined value is when described exhaust sensor is in the described active state on poor side, a value in the poor output area of the output of described exhaust sensor.
10. air fuel ratio control system as claimed in claim 9, wherein said controller is configured to by monitoring that described exhaust sensor remains on an endurance between described first predetermined value and described second predetermined value, judges that described exhaust sensor is in the described active state.
11. air fuel ratio control system as claimed in claim 1, the output of wherein said exhaust sensor is the exhaust sensor output voltage, described first predetermined value is first voltage of being scheduled to, and second predetermined value is second voltage of being scheduled to, and wherein said controller is configured to
Monitor that described exhaust sensor output voltage is reduced under the bias voltage that is applied to described exhaust sensor,
With described sensor output voltage and described first voltage and second voltage ratio, described second voltage is lower than first voltage, and
When being met, first state and second state produce the active state signal of the active state of a described exhaust sensor of expression, described first state is the state that is met during less than described first voltage at described sensor output voltage, and described second state is the state that is met when described transmission mechanism output voltage is lower than described second voltage.
12. air fuel ratio control system as claimed in claim 11, wherein said controller is configured to become when being greater than or equal to described first predetermined voltage at described sensor output voltage, stop the judgement that described exhaust sensor is in active state, and change the judgement that the described exhaust sensor of generation is in inactive state into.
13. an air fuel ratio control procedure comprises:
Carry out the air fuel ratio control of an internal-combustion engine according to the oxygen concentration of the exhaust of the internal-combustion engine that senses;
Be reduced to the rank that is less than or equal to described first predetermined value by the output that monitors described exhaust sensor from rank, check whether described exhaust sensor is in the active state greater than one first predetermined value; And
Be judged as when being in the described active state at described exhaust sensor, allow described air fuel ratio control;
Wherein after the output of described exhaust sensor is reduced under described first predetermined value, in the output of described exhaust sensor when the rank greater than one second predetermined value is reduced to the rank that is less than or equal to described second predetermined value, described exhaust sensor is judged as and is in the described active state, and wherein said second predetermined value is less than described first predetermined value;
Wherein said second predetermined value is a value outside the poor output area of the output of described exhaust sensor when described exhaust sensor is in the described active state on poor side;
Wherein said controller is configured to output when described exhaust sensor between described first and second predetermined values time, judges that described exhaust sensor is not in described active state.
14. air fuel ratio control procedure as claim 13, wherein when the output of described exhaust sensor is being longer than or equal to continue to be less than or equal in time of a scheduled time length described first predetermined value, judge that described exhaust sensor is in the described active state.
15. air fuel ratio control procedure as claim 13, wherein the output of described exhaust sensor is compared with one the 3rd predetermined value, and judge that described exhaust sensor is in the described active state when the output of described exhaust sensor becomes when being less than or equal to described the 3rd predetermined value, wherein said the 3rd predetermined value is set at outside the plentiful output area of output of the described exhaust sensor in the described active state.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004271866 | 2004-09-17 | ||
| JP2004271866 | 2004-09-17 | ||
| JP2005240112 | 2005-08-22 |
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| CN1749542A CN1749542A (en) | 2006-03-22 |
| CN100462535C true CN100462535C (en) | 2009-02-18 |
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| CNB2005101039955A Expired - Fee Related CN100462535C (en) | 2004-09-17 | 2005-09-16 | Exhaust gas sensor activation judgment and air fuel ratio control system/method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006061954A1 (en) * | 2006-12-29 | 2008-07-03 | Robert Bosch Gmbh | Gas component measuring method for motor vehicle, involves charging anode and cathode with regulating pump current, which is directed against regulating Nernst current, and measuring pumping current signal between anode and cathode |
| DE102010063117A1 (en) * | 2010-12-15 | 2012-06-21 | Robert Bosch Gmbh | Method for detecting the operational readiness of a leap lambda probe |
| JP2012251795A (en) * | 2011-05-31 | 2012-12-20 | Yamaha Motor Co Ltd | Activity determination system of oxygen sensor |
| JP6090203B2 (en) * | 2014-02-20 | 2017-03-08 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| ITUB20153146A1 (en) * | 2015-08-17 | 2017-02-17 | Magneti Marelli Spa | CIRCUIT AND METHOD OF CONTROL OF A SINGLE CELL LINEAR OXYGEN SENSOR |
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| US20030213692A1 (en) * | 2002-05-17 | 2003-11-20 | Hitachi Unisia Automotive, Ltd. | Oxygen sensor and method of manufacturing same |
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| US3895611A (en) * | 1972-10-17 | 1975-07-22 | Nippon Denso Co | Air-fuel ratio feedback type fuel injection system |
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