WO2015194108A1 - Dispositif de commande - Google Patents

Dispositif de commande Download PDF

Info

Publication number
WO2015194108A1
WO2015194108A1 PCT/JP2015/002788 JP2015002788W WO2015194108A1 WO 2015194108 A1 WO2015194108 A1 WO 2015194108A1 JP 2015002788 W JP2015002788 W JP 2015002788W WO 2015194108 A1 WO2015194108 A1 WO 2015194108A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
ceramic heater
time
heater
power supply
Prior art date
Application number
PCT/JP2015/002788
Other languages
English (en)
Japanese (ja)
Inventor
攻 田中
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2015194108A1 publication Critical patent/WO2015194108A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/409—Oxygen concentration cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/41—Oxygen pumping cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells

Definitions

  • the present disclosure relates to a control device that detects the state of exhaust gas flowing through an exhaust passage connected to an internal combustion engine.
  • an internal combustion engine such as an automobile gasoline engine discharges exhaust gas generated by combustion of fuel to the outside. Since exhaust gas contains particulate matter such as nitrogen oxide and carbon monoxide, an internal combustion engine is generally equipped with a control device that optimizes the air-fuel ratio so that the particulate matter is reduced.
  • a control device adjusts the fuel supply amount and the air supply amount to the internal combustion engine while detecting the exhaust gas state by a sensor, thereby bringing the air-fuel ratio closer to the theoretical air-fuel ratio (for example, the following patents) Reference 1).
  • an A / F sensor or an O 2 sensor is often used. These are sensors that are attached to an exhaust passage, which is a flow path through which exhaust gas flows, and output an electrical signal corresponding to a difference in oxygen concentration inside and outside the exhaust passage.
  • Each of the A / F sensor and the O 2 sensor includes a solid electrolyte and a heater that heats and activates the solid electrolyte.
  • the A / F sensor outputs an electric signal that changes continuously according to the oxygen concentration in the exhaust passage. Therefore, highly accurate control according to the change of the air-fuel ratio is possible.
  • the O 2 sensor outputs an electric signal that changes stepwise with the oxygen concentration at the stoichiometric air-fuel ratio as a boundary.
  • the A / F sensor is disposed at a position upstream of the catalytic converter that purifies the exhaust gas in the exhaust passage
  • the O 2 sensor is disposed at a position downstream of the catalytic converter.
  • the above-described sensors are generally arranged in the exhaust passage instead of only one.
  • the control device for an internal combustion engine includes a power supply unit that supplies power to a heater of the sensor. When a plurality of sensors are arranged in the exhaust passage, power is supplied from the power supply unit to the plurality of heaters.
  • the control device for example, at the start of the internal combustion engine
  • power supply from the power supply unit to each heater is started.
  • the power supply unit may break down when the power supply is started. There is sex. Since the current flowing through the power supply unit is the sum of the currents flowing through the heaters, from the viewpoint of avoiding failure of the power supply unit, even if a current that overlaps the currents that can flow through the heaters flows, it will not fail. It is necessary to set the allowable current value of the power supply unit. However, the conventional control apparatus does not consider the countermeasures against the failure of the power supply unit.
  • the present disclosure has been made in view of such a problem, and an object of the present disclosure is a control device that detects a state of exhaust gas flowing through an exhaust passage connected to an internal combustion engine, and supplies power to the sensor at startup. It is in providing the control apparatus which can suppress that a part breaks down.
  • the control device includes a first heater that generates heat when supplied with electric power, and detects a state of exhaust gas that passes through a first position of an exhaust passage connected to the internal combustion engine. State of exhaust gas passing through a second position different from the first position in the exhaust passage, having a first receiver that receives a detection signal output from one sensor and a second heater that generates heat upon receiving power supply A second receiving unit that receives a detection signal output from the second sensor that detects the power, a power supply unit that supplies power to the first heater and the second heater, and a first unit that starts supplying power to the first heater And a control unit that controls the power supply unit to start supplying power to the second heater at a second time when the delay time has elapsed from one time.
  • the present disclosure paid attention to the fact that the current flowing through the power supply unit when starting the control device is instantaneous.
  • the control device When the control device is activated, the currents flowing through the first heater and the second heater increase instantaneously, and thereafter decrease over time to reach a steady state. Therefore, the present disclosure has been conceived using this temporal change. .
  • power supply from the power supply unit to the first heater and the second heater is started not at the same time but at different timings. At the start of power supply to the first heater, a large current is output from the power supply unit to the first heater, but the current decreases as the delay time elapses.
  • the power supply to the second heater is started after the delay time has elapsed, that is, after the current output from the power supply unit has decreased. Therefore, the first maximum current that is the maximum current that flows to the first heater at the start of power supply and the second maximum current that is the maximum current to flow to the second heater at the start of power supply are the power supply. Are not output simultaneously from the unit.
  • the current output from the power supply unit can always be smaller than the sum of the first maximum current and the second maximum current. For this reason, even if the allowable current value of the power supply unit is not excessively increased, it is possible to suppress the failure of the power supply unit during startup.
  • the upper limit value that is the upper limit current value within a range in which the sum of the current value flowing through the first heater and the current value flowing through the second heater at the second time does not interfere with the power supply unit. It is preferable that the delay time is determined so as not to exceed. According to such an aspect, the delay time can be shortened as much as possible within a range where the power supply unit does not fail at the time of startup, and the exhaust gas state detection can be started early.
  • it is a control device that detects the state of exhaust gas flowing through an exhaust passage connected to an internal combustion engine, and is capable of suppressing a failure of a power supply unit to the sensor during startup.
  • An apparatus can be provided.
  • FIG. 1 is a schematic diagram illustrating a state in which a control device according to an embodiment of the present disclosure is attached to an internal combustion engine and an exhaust system connected thereto.
  • FIG. 2 is a graph showing the time change of the voltage applied to the heater and the time change of the current supplied to the heater in the control device shown in FIG.
  • FIG. 3 is a graph showing the change over time of the current supplied to the heater in the control device shown in FIG.
  • FIG. 4 is a graph showing the time change of the voltage applied to the heater and the time change of the current supplied to the heater in the control device shown in FIG.
  • FIG. 1 is a schematic diagram illustrating a state in which a control device according to an embodiment of the present disclosure is attached to an internal combustion engine and an exhaust system connected thereto.
  • FIG. 2 is a graph showing the time change of the voltage applied to the heater and the time change of the current supplied to the heater in the control device shown in FIG.
  • FIG. 3 is a graph showing the change over time of the current supplied to the heater in
  • FIG. 5 is a flowchart showing the operation of the control device shown in FIG.
  • FIG. 6 is a diagram showing the relationship between the heater temperature and the set delay time.
  • FIG. 7 is a diagram showing the relationship between the temperature of the cooling water for cooling the internal combustion engine and the set delay time
  • FIG. 8 is a graph showing the time change of the voltage applied to the heater and the time change of the current supplied to the heater in the conventional control device.
  • the internal combustion engine 100 that is a control target of the control system 10 including the control device 40 according to the embodiment of the present disclosure is a spark ignition type automobile gasoline engine.
  • an intake pipe 101 and an exhaust pipe 110 are connected to the internal combustion engine 100.
  • the exhaust pipe 110 forms an exhaust passage.
  • the intake pipe 101 is a pipe that supplies an air-fuel mixture in which air and fuel are mixed to the internal combustion engine 100.
  • a throttle valve (not shown) for adjusting the amount of air supplied into the intake pipe 101 and a fuel injection valve (not shown) for adjusting the amount of fuel supplied into the intake pipe 101 are attached to the intake pipe 101. Yes.
  • the amount of air supplied into the intake pipe 101 changes depending on the opening of the throttle valve, and the amount of fuel supplied into the intake pipe 101 changes depending on the opening time of the fuel injection valve.
  • the control device 40 performs control to bring the air-fuel ratio of the air-fuel mixture supplied to the internal combustion engine 100 closer to the stoichiometric air-fuel ratio by mainly adjusting the supply amount of fuel injected from the fuel injection valve.
  • the exhaust pipe 110 is a pipe connected to the internal combustion engine 100, and is an exhaust passage that discharges exhaust gas generated by fuel combustion in the internal combustion engine 100 to the outside.
  • the exhaust pipe 110 includes an upstream pipe 111 that is an upstream pipe, a downstream pipe 112 that is a downstream pipe, and a catalytic converter 120.
  • the catalytic converter 120 is disposed between the upstream pipe 111 and the downstream pipe 112. Exhaust gas generated in the internal combustion engine 100 flows through the upstream pipe 111, the catalytic converter 120, and the downstream pipe 112 in this order, and then is discharged to the outside from an exhaust port 114 that is an opening formed at the downstream end of the downstream pipe 112. Is done.
  • the catalytic converter 120 purifies particulate matter contained in the exhaust gas by oxidation or reduction, and has a catalyst carrier 121 carrying platinum, palladium, and rhodium as catalysts. Hydrocarbons, carbon monoxide, and nitrogen oxides contained in the exhaust gas are purified by touching these catalysts, and then flow through the downstream pipe 112 and are discharged to the outside through the discharge port 114.
  • the control system 10 includes a first sensor 20, a second sensor 30, a water temperature sensor 70, an air temperature sensor 80, and a control device 40.
  • the first sensor 20 is an A / F sensor that detects the state of exhaust gas (oxygen concentration) generated in the internal combustion engine 100, and is provided at the first position 111 a of the upstream pipe 111.
  • the first sensor 20 is an A / F sensor having a general configuration, and includes a plate-shaped solid electrolyte 21 and a ceramic heater 22 (first heater) for heating the solid electrolyte 21.
  • a detection electrode is disposed on the first surface of the solid electrolyte 21, and the exhaust gas in the upstream pipe 111 passes through the porous body and reaches the surface.
  • a reference electrode is formed on the second surface of the solid electrolyte 21, and a gas having a reference oxygen concentration, that is, the atmosphere reaches the surface.
  • the 1st sensor 20 is a sensor which outputs the electric signal which changes continuously according to the oxygen concentration inside the upstream piping 111.
  • FIG. 1st sensor 20 is a sensor which outputs the electric signal which changes continuously according to the oxygen concentration inside the upstream piping 111.
  • the second sensor 30 is an O 2 sensor that detects the state (oxygen concentration) of the exhaust gas after passing through the catalytic converter 120, and is provided at the second position 112 a of the downstream pipe 112.
  • the second sensor 30 is an O 2 sensor having a general configuration, and includes a solid electrolyte 31 formed in a plate shape and a ceramic heater 32 (second heater) for heating the solid electrolyte 31.
  • Detecting electrodes are arranged on the first surface of the solid electrolyte 31, and the exhaust gas in the downstream pipe 112 passes through the porous body and reaches the surface. Further, a reference electrode is formed on the second surface of the solid electrolyte 31, and a gas having a reference oxygen concentration, that is, the atmosphere reaches the surface.
  • the solid electrolyte 31 is heated to a high temperature by the ceramic heater 32, that is, activated so as to allow oxygen ions to pass therethrough. Maintained. A voltage is applied between the detection electrode and the reference electrode.
  • a current flows between the detection electrode and the reference electrode (solid electrolyte 31) due to the difference (concentration difference) between the oxygen concentration inside the downstream pipe 112 and the external oxygen concentration.
  • concentration difference exceeds a predetermined value
  • the second sensor 30 generates an electrical signal based on this current and outputs it as a detection signal to the control device 40.
  • the current itself may be directly input to the control device 40 as a detection signal.
  • the predetermined value is a value of the oxygen concentration in the downstream pipe 112 when the air-fuel ratio of the air-fuel mixture supplied to the internal combustion engine 100 is the stoichiometric air-fuel ratio.
  • the control device 40 compares the current value with a threshold value stored in advance to determine whether or not the oxygen concentration in the downstream pipe 112 is greater than the oxygen concentration at the stoichiometric air-fuel ratio.
  • the second sensor 30 is a sensor that outputs an electrical signal indicating whether or not the oxygen concentration inside the downstream pipe 112 is higher than the oxygen concentration at the stoichiometric air-fuel ratio.
  • the internal combustion engine 100 is provided with a radiator (not shown). Cooling water for cooling the internal combustion engine 100 is circulated between the radiator and the internal combustion engine 100.
  • the water temperature sensor 70 is a sensor that detects the temperature of the circulating cooling water.
  • the temperature sensor 80 is a sensor that measures the temperature of the outside air.
  • the temperature of the cooling water measured by the water temperature sensor 70 and the temperature of the outside air measured by the air temperature sensor 80 are respectively input to the control device 40 described below.
  • the control device 40 is a computer system including a CPU, a ROM, a RAM, and an input / output interface, and is referred to as a so-called ECU (Engine Control Unit).
  • the control device 40 adjusts the opening degree of the throttle valve and the opening time of the fuel injection valve based on the electrical signal received from the first sensor 20 and the electrical signal received from the second sensor 30. Then, control is performed to bring the air-fuel ratio closer to the theoretical air-fuel ratio.
  • the electrical signal received from the first sensor 20 indicates the oxygen concentration in the upstream pipe 111
  • the electrical signal received from the second sensor 30 indicates the oxygen concentration in the downstream pipe 112.
  • the control device 40 includes a signal receiving unit 41, a power supply unit 42, and a control unit 43.
  • the signal receiving unit 41 includes a first receiving unit 411 and a second receiving unit 412.
  • the first receiving unit 411 is an input port that receives an electrical signal output from the first sensor 20.
  • the second receiving unit 412 is an input port that receives an electrical signal output from the second sensor 30.
  • the first receiver 411 and the first sensor 20 are connected by a signal line 51.
  • the electrical signal output from the first sensor 20 is transmitted via the signal line 51 and input to the first receiving unit 411.
  • the second receiver 412 and the second sensor 30 are connected by a signal line 61.
  • the electrical signal output from the second sensor 30 is transmitted via the signal line 61 and input to the second receiving unit 412.
  • the power supply unit 42 is an output port that supplies power necessary for heat generation to each of the ceramic heater 22 of the first sensor 20 and the ceramic heater 32 of the second sensor 30.
  • the power supply unit 42 and the ceramic heater 22 are connected by a power line 52.
  • the power output from the power supply unit 42 is supplied to the ceramic heater 22 via the power line 52.
  • the power supply unit 42 and the ceramic heater 32 are connected by a power line 62.
  • the power output from the power supply unit 42 is supplied to the ceramic heater 32 via the power line 62.
  • the power supply to the ceramic heater 22 and the power supply to the ceramic heater 32 can be performed independently (at different timings).
  • the power supply unit 42 is configured to be able to supply power independently to each of the ceramic heater 22 and the ceramic heater 32, but the part that generates the power is shared, A current in which the current flowing through the ceramic heater 22 and the current flowing through the ceramic heater 32 are superimposed flows.
  • the control unit 43 is a part that forms the center of the control device 40 that is a computer system, and that controls the throttle valve, the fuel injection valve, and the power supply unit 42. The timing at which the voltage is applied to each of the ceramic heater 22 and the ceramic heater 32 and the magnitude of the applied voltage are controlled by the control unit 43.
  • FIG. 2A is a diagram in which time is taken on the horizontal axis, and voltages applied to the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 2B is a diagram in which time is taken on the horizontal axis, and currents flowing through the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 2C is a diagram in which time is taken on the horizontal axis and current flowing in the power supply unit 42 is taken on the vertical axis.
  • FIG. 2A represents a time change of the voltage applied to the ceramic heater 22 with the power supply from the power supply unit 42.
  • the line G10 illustrated in FIG. Similarly, a line G ⁇ b> 20 shown in FIG. 2A represents a change over time in the voltage applied to the ceramic heater 32 as power is supplied from the power supply unit 42.
  • a line G30 shown in FIG. 2 (B) represents a time change of the current flowing through the ceramic heater 22 in accordance with the power supply from the power supply unit. In this case, this current is the first current.
  • a line G ⁇ b> 40 shown in FIG. 2B represents a time change of the current flowing through the ceramic heater 32 with the power supply from the power supply unit 42. In this case, this current is the second current.
  • a line G50 shown in FIG. 2C indicates a total current of the first current flowing through the ceramic heater 22 and the second current flowing through the ceramic heater 32, that is, the total output from the power supply unit 42. It represents the change in current over time. In this case, this current is the total current.
  • the control system 10 When the internal combustion engine 100 is started at time t0, the control system 10 is started at the same time, and supply of electric power to the ceramic heater 22 is started. In the period from time t0 to time t2, a relatively small voltage V 10 is applied to the ceramic heater 22 (see line G10). After time t2, a large voltage V 20 than the voltage V 10 is applied to the ceramic heater 22. The reason why the applied voltage is increased stepwise is to prevent the ceramic heater 22 from being damaged due to a rapid temperature rise.
  • the supply of power to the ceramic heater 32 is not started at time t0, but is started at time t1 when the delay time td1 has elapsed from time t0.
  • the time t1 is a time before the time t2.
  • the supply of power to the ceramic heater 22 and the supply of power to the ceramic heater 32 are not started simultaneously. The reason will be described later.
  • a relatively small voltage V 10 is applied to the ceramic heater 32 (see line G20).
  • a large voltage V 20 is applied to the ceramic heater 32 than the voltage V 10.
  • the reason why the applied voltage is increased stepwise is to prevent the ceramic heater 32 from being damaged due to a rapid temperature rise.
  • the value of the voltage applied to the ceramic heater 22 (V 10, V 20) , the value of the voltage applied to the ceramic heater 32 (V 10, V 20) and in the equal to each other Only the timing for applying or increasing the voltage is different from each other. However, the value of the voltage applied to each ceramic heater may be different from each other.
  • the time during which the voltage V 10 is applied to the ceramic heater 32 is the time during which the voltage V 20 is applied to the ceramic heater 22 (from time t0). (Time until time t2). Applying a relatively small voltage V 10 long, Evaporation of the water droplets with gentle rise in temperature of the ceramic heater 32, so as to prevent the ceramic heater 32 is cracked as described above.
  • the timing at which the voltage V 20 starts to be applied to the ceramic heater 32 is a point in time when a certain time (fixed length of time) has elapsed from the time t0 when the internal combustion engine 100 was started. However, it may be the time when the water temperature sensor 70 confirms that the temperature of the cooling water for cooling the internal combustion engine 100 has risen and exceeded a predetermined temperature.
  • the first current starts to flow through the ceramic heater 22 (see line G30).
  • the voltage V 10 to be applied is constant for the first current is not constant from the beginning.
  • the voltage V 10 begins to be applied, resulting in a large current (overcurrent) flows through the ceramic heater 22.
  • the first current flowing through the ceramic heater 22 gradually decreases and approaches a substantially constant current.
  • the maximum value of the overcurrent flowing when the voltage V 10 is applied to the ceramic heater 22 hereinafter referred to as maximum current I 10 is.
  • the overcurrent as described above flows also in the ceramic heater 32.
  • the voltage V 10 starts to be applied to the ceramic heater 32 at time t1
  • an overcurrent flows through the ceramic heater 32 (see line G40).
  • the second current flowing through the ceramic heater 32 gradually decreases and approaches a substantially constant current.
  • the electrical resistance value of the ceramic heater 22 and the electrical resistance value of the ceramic heater 32 are substantially equal to each other. Therefore, the maximum value of the overcurrent flowing when the voltage V 10 is applied to the ceramic heater 32 (second current at time t1) is substantially equal to the maximum current I 10. The maximum value of the overcurrent flowing when the voltage V 20 is applied to the ceramic heater 32 (second current at time t3) is substantially equal to the maximum current I 20.
  • overcurrent flows through the ceramic heater 22 at each time point (time t0, t2) when the voltage is applied or increased.
  • overcurrent flows through the ceramic heater 32 at each time point (time t1, t3) when the voltage is applied or increased.
  • time t1, t3 when the voltage is applied or increased.
  • the total current output from the power supply unit 42 also increases at each of the times t0, t1, t2, and t3 when the overcurrent flows.
  • FIG. 8A is a diagram in which time is taken on the horizontal axis and voltages applied to the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 8B is a diagram in which time is taken on the horizontal axis and currents flowing through the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 8C is a diagram in which time is taken on the horizontal axis and current flowing in the power supply unit 42 is taken on the vertical axis.
  • a line G12 shown in FIG. 8A represents a time change of the voltage applied to the ceramic heater 22, and is a line that follows the same transition as the line G10 of FIG.
  • a line G22 shown in FIG. 8A represents a time change of the voltage applied to the ceramic heater 32, and is a graph obtained by shifting the line G20 of FIG. 2 to the left by the delay time td1. It has become. 8, time t31 the voltage applied to the ceramic heater 32 is changed from the voltage V 10 to the voltage V 20 has a time earlier by a delay time td1 than the time t3 of FIG.
  • a line G ⁇ b> 52 shown in FIG. 8C represents a time change of the total current obtained by adding the first current flowing through the ceramic heater 22 and the second current flowing through the ceramic heater 32.
  • the power supply to the ceramic heater 22 and the power supply to the ceramic heater 32 may be started simultaneously at time t0.
  • the magnitude of the total current output from the power supply unit 42 at time t0 is the maximum value of the overcurrent flowing through the ceramic heater 22 (maximum current I 10 ) and the maximum value of the overcurrent flowing through the ceramic heater 32 ( The maximum current I 10 ) is superposed, that is, a current twice as large as the maximum current I 10 flows.
  • the allowable current value I TH is the maximum value of the current that can be output to the outside without failure of the power supply unit 42, and is a specific value determined by the specifications of various electronic components and protection circuits that constitute the power supply unit 42. Value.
  • the allowable current value I TH is an upper limit current value in a range that does not interfere with the power supply unit.
  • the allowable current value I TH is set sufficiently large.
  • the components of the power supply unit 42 for example, such that the allowable current value I TH is large enough to supply the maximum current I 10 simultaneously to both the ceramic heater 22 and the ceramic heater 32. It was necessary to select a protection circuit. However, such a measure is not preferable because the parts cost of the power supply unit 42 becomes large.
  • the power supply unit 42 is broken by devising the timing of power supply to each of the ceramic heater 22 and the ceramic heater 32 instead of increasing the allowable current value I TH. It is preventing. Specifically, as described with reference to FIG. 2, at time t ⁇ b> 1 (second time) when delay time td ⁇ b> 1 has elapsed from time t ⁇ b> 0 (first time) when supply of power to the ceramic heater 22 is started. Control of the power supply unit 42 by the control unit 43 is performed so as to start supply of power to the heater 32.
  • Such a device for power supply timing is an instantaneous eddy current as described below, and the time when the current flowing through the ceramic heater 22 and the ceramic heater 32 starts to flow (time t0, t2). ), And it was made by paying attention to the point where it gradually decreases.
  • the first current flowing through the ceramic heater 22 becomes the maximum current I 10 , and this time is peaked and thereafter gradually. Decrease (see line G30).
  • the power supply from the power supply unit 42 to the ceramic heater 32 is performed after the delay time td1 has elapsed from time t0 (time t1), that is, the first current output from the power supply unit 42 decreases and the maximum current I 10 is reduced. It starts after becoming smaller.
  • the first current flowing through the ceramic heater 22 and the second current flowing through the ceramic heater 32 do not simultaneously reach their maximum values (maximum current I 10 ).
  • the value of the total current output from the power supply unit 42 is smaller than twice the maximum current I 10 at both time t0 and time t1, and may exceed the allowable current value I TH. None (see line G50).
  • the current output from the power supply unit 42 has the maximum overcurrent (maximum current I 10 ) flowing through the ceramic heater 22 and the maximum overcurrent (maximum current I 10 ) flowing through the ceramic heater 32. It is always smaller than the superposition of the current I 10 ). For this reason, it is possible to prevent the power supply unit 42 from being damaged by an overcurrent without excessively increasing the allowable current value I TH of the power supply unit 42.
  • the delay time td1 in the present embodiment is set as short as possible within a range in which the total current does not exceed the allowable current value I TH even when current is supplied to the ceramic heater 32.
  • the total current at the time when the second current starts to be supplied to the ceramic heater 32 (time t1) is equal to the first current that has decreased during the delay time td1 (as shown in FIG. 2).
  • Current I 07 ) and the second current (maximum current I 10 ) the length of the delay time td 1 is set so that the magnitude is slightly less than the allowable current value I TH. ing.
  • the first current decreases from the maximum current I 10 and the upper limit current
  • the length of the delay time td1 is set so as to be a time required for the time to be slightly less than.
  • the total current at time t2 is the sum of the first current (maximum current I 20 ) at that time and the second current (the magnitude thereof is current I 08 as shown in FIG. 2). Further, the total current at time t3 is the sum of the first current at that time (the magnitude is current I 09 as shown in FIG. 2) and the second current (maximum current I 20 ). .
  • the delay time td1 is set to be as short as possible within the range where the total current does not exceed the allowable current value I TH not only at time t1 but also at time t2 and time t3. Yes. Therefore, while reliably preventing the power supply unit 42 from failing, the temperature of each of the ceramic heater 22 and the ceramic heater 32 is increased at an early stage, and control for optimizing the air-fuel ratio is started at an early stage. Is possible.
  • the ceramic heater 22 and the ceramic heater 32 are made of metal (tungsten) at the portion where current passes and generates heat. For this reason, the electrical resistance is not always constant, the electrical resistance decreases as the temperature decreases, and the electrical resistance increases as the temperature increases.
  • the magnitude of the first current flowing through the ceramic heater 22 and the magnitude of the second current flowing through the ceramic heater 32 also vary depending on the temperature of the ceramic heater 22 and the temperature of the ceramic heater 32, respectively.
  • the line G30 shown in FIG. 3 is the same line as the line G30 shown in FIG. 2, and represents the time change of the first current flowing through the ceramic heater 22. Also, the line G31 shown in FIG. 3 is the time change of the first current flowing through the ceramic heater 22, and the time of the first current when the ceramic heater 22 is at a lower temperature than in the case of the line G30. It represents a change.
  • the voltage applied to the ceramic heater 22 is the same as the voltage represented by the line G12 in FIG.
  • the first current flowing through the ceramic heater 22 increases as the electrical resistance decreases.
  • the first current at time t0 is larger than the maximum current I 10 (maximum current I 10 a).
  • the first current at time t2 has a large current (maximum current I 20 a) than the maximum current I 20.
  • the first current at the time t1 has a large current (current I 07 a) than the current I 07.
  • the total current is larger than the current I 07.
  • the maximum value of the second current (maximum current I 10 ) is added to the current I 07 a. As a result, the total current may exceed the allowable current value I TH at low temperatures.
  • the ceramic heater 22 when the ceramic heater 22 is at a low temperature, the ceramic heater 32 is also at a low temperature, and there is a high possibility that a current easily flows through the ceramic heater 32. Therefore, the possibility that the total current exceeds the allowable current value I TH is further increased.
  • the length of the delay time (td1) is not always fixed, but the delay time is set to an appropriate length based on the temperature of the ceramic heater 22 at the start of current supply. Is set. That is, the delay time is set based on the temperature of the ceramic heater 22 so that the delay time is as short as possible within a range where the total current does not exceed the allowable current value I TH .
  • FIG. 4 shows the control performed by the control device 40 when the temperature is low, that is, when the outside air temperature is low and the temperature of both the ceramic heater 22 and the ceramic heater 32 is low (than the case of FIG. 2). While explaining.
  • FIG. 4A is a diagram in which time is taken on the horizontal axis, and voltages applied to the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 4B is a diagram in which time is taken on the horizontal axis, and currents flowing through the ceramic heater 22 and the ceramic heater 32 are taken on the vertical axis.
  • FIG. 4C is a diagram in which time is taken on the horizontal axis and current flowing through the power supply unit 42 is taken on the vertical axis.
  • a line G11 shown in FIG. 4A represents a time change of the voltage applied to the ceramic heater 22 at a low temperature, and follows the same transition as the line G10 in FIG.
  • a line G21 shown in FIG. 4A represents a change over time in the voltage applied to the ceramic heater 32 at a low temperature.
  • the waveform of the line G21 is the same as that of the line G20 shown in FIG. 2, but is different from the line G20 at the timing when the voltage starts to be applied to the ceramic heater 32.
  • a line G31 shown in FIG. 4B represents a time change of the first current flowing through the ceramic heater 22 at a low temperature, and follows the same transition as the line G31 shown in FIG. .
  • a line G41 shown in FIG. 4B represents a time change of the second current flowing through the ceramic heater 32 at a low temperature.
  • a line G50 shown in FIG. 4C represents a time change of the total current obtained by adding the first current flowing through the ceramic heater 22 and the second current flowing through the ceramic heater 32.
  • the delay time td2 set at this time is a time from time t0 to time t10, which is longer than the delay time td1 shown in FIG.
  • the electrical resistance of the ceramic heater 22 and the electrical resistance of the ceramic heater 32 are both lower than in the case of FIG. 2, and current easily flows through each ceramic heater. However, at a low temperature, a delay time td2 longer than the delay time td1 is set. Since the supply of the second current is started after the first current is sufficiently reduced, the total current does not exceed the allowable current value I TH .
  • the delay time td2 is set as short as possible within a range in which the total current does not exceed the allowable current value I TH even when current is supplied to the ceramic heater 32.
  • the total current at the time when the second current starts to be supplied to the ceramic heater 32 is the first current (current I 09 a) that has decreased during the lapse of the delay time td2 and the second current (maximum). although become the sum of the current I 10 a), its magnitude as slightly below the allowable current value I TH, the length of the delay time td2 is set.
  • the first current is calculated from the maximum current I 10 a.
  • the length of the delay time td2 is set so as to be the time required to decrease and slightly fall below the upper limit current.
  • the total current at time t30 is the sum of the first current at that time (the magnitude is current I 08 a as shown in FIG. 4) and the second current (maximum current I 20 a). It becomes.
  • the delay time td2 at low temperature is set to be as short as possible within a range where the total current does not exceed the allowable current value I TH. Yes. For this reason, it is possible to start the control for optimizing the air-fuel ratio at an early stage by increasing the temperatures of the ceramic heater 22 and the ceramic heater 32 at an early stage while preventing the power supply unit 42 from malfunctioning. It has become.
  • the delay time td1 or the delay time td2 is set according to the temperature of the ceramic heater 22. A flow of processing performed when the control system 10 is activated will be described with reference to FIG.
  • the control system 10 is started and control by the control device 40 is started.
  • the length of the delay time is set based on the temperature of the ceramic heater 22. Specifically, if the temperature of the ceramic heater 22 is higher than a predetermined threshold, a short delay time td1 is set. If the temperature of the ceramic heater 22 is equal to or lower than the threshold value, a long delay time td2 is set. The temperature of the ceramic heater 22 is acquired by a temperature sensor attached to the ceramic heater 22 directly or in the vicinity thereof.
  • control unit 43 starts supplying power from the power supply unit 42 to the ceramic heater 22. Since the process of S01 immediately before is performed instantaneously, the time when S02 is executed is the same as the time t0 when the control system 10 is activated.
  • S03 it is determined whether or not the set delay time (td1 or td2) has elapsed since time t0 when S01 was performed. If the delay time has not elapsed, the process of S03 is repeated. If the delay time has elapsed, the process proceeds to S04.
  • control unit 43 starts supplying power from the power supply unit 42 to the ceramic heater 32. Since the processing as described above is executed when the control system 10 is started, an appropriate delay time (td1 or td2) corresponding to the temperature of the ceramic heater 22 is set.
  • the temperature of the ceramic heater 22 is acquired by a temperature sensor attached to the ceramic heater 22 directly or in the vicinity thereof.
  • the temperature of the ceramic heater 22 may be acquired or estimated by another method.
  • the electrical resistance may be calculated from the voltage applied to the ceramic heater 22 and the current flowing therewith, and the temperature of the ceramic heater 22 may be estimated based on the electrical resistance.
  • the delay time td1 or the time based on whether the calculated electrical resistance is higher than a predetermined threshold value or One of the delay times td2 may be set. Specifically, when the calculated electric resistance is higher than a predetermined threshold, the delay time td1 is set, and when the calculated electric resistance is equal to or less than the predetermined threshold, the delay time td2 is set. It is good.
  • the temperature of the ceramic heater 22 may be estimated based on the element resistance value of the first sensor 20.
  • the element resistance value of the first sensor 20 is an electrical resistance that a current passing through the solid electrolyte 21 receives. Such an element resistance value can be calculated from the relationship between the applied voltage to the solid electrolyte 21 and the passing current when exhaust gas having a known oxygen concentration passes through the exhaust pipe 110.
  • the delay time is determined based on whether the calculated element resistance value is higher than a predetermined threshold value.
  • Either td1 or delay time td2 may be set. Specifically, the delay time td1 is set when the calculated element resistance value is higher than a predetermined threshold value, and the delay time td2 is set when the calculated element resistance value is less than or equal to the predetermined threshold value. It is good also as an aspect which is.
  • the temperature of the ceramic heater 32 may be directly acquired or may be estimated based on the electric resistance of the ceramic heater 32. Further, it may be estimated based on the element resistance value of the second sensor 30.
  • the element resistance value of the second sensor 30 is an electrical resistance received by the current passing through the solid electrolyte 31.
  • Either the delay time td1 or the delay time td2 may be set based on whether or not the coolant temperature measured by the water temperature sensor 70 is higher than a predetermined threshold. Specifically, the delay time td1 is set when the measured cooling water temperature is higher than a predetermined threshold, and the delay time td2 is set when the measured cooling water temperature is equal to or lower than the predetermined threshold. It is good also as a mode set up.
  • either the delay time td1 or the delay time td2 may be set. Specifically, the delay time td1 is set when the measured outside air temperature is higher than a predetermined threshold, and the delay time td2 is set when the measured outside air temperature is equal to or lower than the predetermined threshold. It is good also as an aspect which is.
  • either one of the two delay times is set based on whether or not the temperature of the ceramic heater 22 is higher than a predetermined threshold value.
  • the delay time may be set from the values (candidates).
  • the relationship between the temperature (horizontal axis) of the ceramic heater 22 and the delay time (vertical axis) to be set is stored in the control device 40, and based on the relationship, the ceramic heater The delay time corresponding to the temperature of 22 may be set. In the example shown in FIG. 6, a shorter delay time is set as the temperature of the ceramic heater 22 is higher.
  • the relationship between the temperature of the ceramic heater 22 and the delay time to be set is determined by experiments and simulations performed in advance and is stored by the control device 40.
  • the relationship between the coolant temperature (horizontal axis) measured by the water temperature sensor 70 and the delay time (vertical axis) to be set is stored in the control device 40. Based on this relationship, a delay time corresponding to the coolant temperature may be set. In the example shown in FIG. 7, a shorter delay time is set as the coolant temperature is higher.
  • the relationship between the temperature of the outside air measured by the temperature sensor 80 and the delay time to be set is stored in the control device 40, and the delay time corresponding to the temperature of the outside air is based on the relationship. It is good also as an aspect by which is set. Also in this case, a shorter delay time is set as the outside air temperature is higher.

Abstract

L'invention porte sur un dispositif de commande (40), lequel dispositif comporte une première unité de réception (411) qui reçoit un signal de détection délivré en sortie par un premier capteur (20) qui contient un premier élément chauffant (22) et qui détecte l'état d'un gaz d'échappement passant par une première position (111a) dans un passage d'échappement (110), et une seconde unité de réception (412) qui reçoit un signal de détection délivré en sortie par un second capteur (30) qui contient un second élément chauffant (32) et qui détecte l'état du gaz d'échappement passant par une seconde position (112a) qui est différente de la première position susmentionnée (111a), une unité d'alimentation (42) qui délivre une alimentation au premier élément chauffant (22) et au second élément chauffant (32), et une unité de commande (43) qui commande l'unité d'alimentation (42) de telle sorte que ladite unité d'alimentation (42) commence à délivrer une alimentation au second élément chauffant (32) à un second point dans le temps, auquel un retard donné s'est écoulé à partir d'un premier point dans le temps auquel l'unité d'alimentation (42) a commencé à délivrer une alimentation au premier élément chauffant (22).
PCT/JP2015/002788 2014-06-20 2015-06-02 Dispositif de commande WO2015194108A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-126839 2014-06-20
JP2014126839A JP2016006384A (ja) 2014-06-20 2014-06-20 制御装置

Publications (1)

Publication Number Publication Date
WO2015194108A1 true WO2015194108A1 (fr) 2015-12-23

Family

ID=54935120

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/002788 WO2015194108A1 (fr) 2014-06-20 2015-06-02 Dispositif de commande

Country Status (2)

Country Link
JP (1) JP2016006384A (fr)
WO (1) WO2015194108A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208092228U (zh) 2016-01-15 2018-11-13 日本电产株式会社 融合装置
KR102572461B1 (ko) * 2021-12-15 2023-08-30 주식회사 현대케피코 복수의 차량용 히터 제어 방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882149A (ja) * 1981-11-11 1983-05-17 Nissan Motor Co Ltd 酸素濃度センサ内蔵ヒ−タの制御装置
JPH0815215A (ja) * 1994-06-28 1996-01-19 Nippondenso Co Ltd 酸素濃度判定装置
JPH1010083A (ja) * 1996-06-26 1998-01-16 Toyota Motor Corp 空燃比センサのヒータ通電制御装置
JP2006250945A (ja) * 2006-04-17 2006-09-21 Honda Motor Co Ltd 排ガスセンサの温度制御装置
JP2012082835A (ja) * 2011-11-28 2012-04-26 Nissan Motor Co Ltd 内燃機関

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882149A (ja) * 1981-11-11 1983-05-17 Nissan Motor Co Ltd 酸素濃度センサ内蔵ヒ−タの制御装置
JPH0815215A (ja) * 1994-06-28 1996-01-19 Nippondenso Co Ltd 酸素濃度判定装置
JPH1010083A (ja) * 1996-06-26 1998-01-16 Toyota Motor Corp 空燃比センサのヒータ通電制御装置
JP2006250945A (ja) * 2006-04-17 2006-09-21 Honda Motor Co Ltd 排ガスセンサの温度制御装置
JP2012082835A (ja) * 2011-11-28 2012-04-26 Nissan Motor Co Ltd 内燃機関

Also Published As

Publication number Publication date
JP2016006384A (ja) 2016-01-14

Similar Documents

Publication Publication Date Title
EP2343526B1 (fr) Contrôleur de dispositif de véhicule et procédé correspondant de détection d'anomalies du capteur de température
US7467628B2 (en) Oxygen sensor heater control methods and systems
JP5907345B2 (ja) ガスセンサ制御装置及び内燃機関の制御装置
CN103261604B (zh) 电加热式催化剂的故障检测装置
EP2570802A1 (fr) Système de contrôle de moteur à combustion interne
JP2011231708A (ja) 触媒温度状態診断装置
WO2015194108A1 (fr) Dispositif de commande
JP6965578B2 (ja) ガスセンサ制御装置
JP6119434B2 (ja) ガスセンサ制御装置
KR102028420B1 (ko) 배기 가스 센서의 작동 방법 및 장치
JP2007040130A (ja) 内燃機関の排気浄化装置
JP2006105136A (ja) ラムダセンサの電気加熱のための制御方法及び装置
US20200088665A1 (en) Gas sensor diagnosis device
JP4654946B2 (ja) 内燃機関の燃料供給装置
US20210363905A1 (en) Methods and systems for detecting an impedance of a catalytic converter
JP2013189865A (ja) 排気ガスセンサの制御装置
JP2009216067A (ja) 触媒劣化判定装置及び触媒劣化判定方法
JP2019074360A (ja) ガスセンサ制御装置
JP4877291B2 (ja) ヒータ劣化検出装置
JP2007225560A (ja) ガスセンサのヒータ制御装置
JP2006207424A (ja) ヒータ制御装置
EP3094839B1 (fr) Système de détermination d'une anormalité d'un filtre
JP2019094829A (ja) 酸素濃度検出器の劣化判定装置
US11286833B2 (en) Systems and methods for detecting structural and operational states of a component of an exhaust aftertreatment system
JP2008082295A (ja) 排気ガスセンサの異常診断装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15809594

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15809594

Country of ref document: EP

Kind code of ref document: A1