WO2017022674A1 - 排気浄化装置 - Google Patents

排気浄化装置 Download PDF

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Publication number
WO2017022674A1
WO2017022674A1 PCT/JP2016/072363 JP2016072363W WO2017022674A1 WO 2017022674 A1 WO2017022674 A1 WO 2017022674A1 JP 2016072363 W JP2016072363 W JP 2016072363W WO 2017022674 A1 WO2017022674 A1 WO 2017022674A1
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WIPO (PCT)
Prior art keywords
temperature
outlet temperature
oxidation catalyst
injection amount
exhaust
Prior art date
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PCT/JP2016/072363
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English (en)
French (fr)
Japanese (ja)
Inventor
太 中野
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いすゞ自動車株式会社
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Priority to CN201680044455.0A priority Critical patent/CN107849963B/zh
Publication of WO2017022674A1 publication Critical patent/WO2017022674A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00

Definitions

  • the present invention relates to an exhaust purification device that controls the gas temperature on the outlet side of a catalyst provided in an exhaust system.
  • oxidation catalyst Diesel Oxidation Catalyst: DOC
  • HC hydrocarbons
  • CO carbon monoxide
  • NO nitrogen monoxide
  • DPF diesel particulate filter
  • An object of the present invention is to provide a technique capable of appropriately controlling the temperature of a gas supplied downstream of exhaust gas through an oxidation catalyst.
  • an exhaust emission control device includes an oxidation catalyst capable of oxidizing hydrocarbons in exhaust gas, and particulate matter in exhaust gas provided on the exhaust gas downstream side of the oxidation catalyst.
  • Filter that can be collected
  • forced regeneration means that can perform forced regeneration by supplying hydrocarbons to the oxidation catalyst and burning off particulate matter deposited on the filter, and inlet temperature that is the exhaust gas temperature of the oxidation catalyst inlet ,
  • An outlet temperature detecting means for detecting an outlet temperature which is an exhaust gas temperature at the outlet of the oxidation catalyst, an exhaust gas flow rate detecting means for detecting an exhaust gas flow rate passing through the oxidation catalyst, and an inlet temperature
  • a basic injection that determines a basic injection amount, which is a hydrocarbon injection amount that needs to be supplied to the oxidation catalyst in order to achieve the target temperature, based on the exhaust gas flow rate and the target temperature of the oxidation catalyst outlet temperature Decision And an oxidation catalyst outlet temperature when a basic injection amount of
  • the second temperature for estimating the outlet temperature in the case of the inlet temperature.
  • the estimated outlet temperature of the oxidation catalyst based on the estimated temperature change of the outlet temperature and the estimated outlet temperature, and the outlet temperature detected by the outlet temperature detection means
  • the feedback calculation means for obtaining the corrected injection quantity, which is the hydrocarbon injection quantity to be corrected, and the control injection quantity obtained by adding the basic injection quantity and the corrected injection quantity are output to the forced regeneration means. Having a reproduction control means for controlling the so that.
  • An exhaust emission control device includes an oxidation catalyst capable of oxidizing hydrocarbons in exhaust gas, and a filter provided on the exhaust downstream side of the oxidation catalyst and capable of collecting particulate matter in the exhaust gas. And an injection device capable of performing forced regeneration for supplying hydrocarbons to the oxidation catalyst and burning and removing particulate matter deposited on the filter, and an inlet for detecting an inlet gas temperature as an exhaust gas temperature of the inlet of the oxidation catalyst A temperature sensor, an outlet temperature sensor that detects an outlet temperature that is an exhaust gas temperature at the outlet of the oxidation catalyst, an exhaust gas flow rate sensor that detects an exhaust gas flow rate that passes through the oxidation catalyst, and a control unit.
  • the control unit operates to perform the following process: Based on the inlet temperature, the exhaust gas flow rate, and the target temperature of the outlet temperature of the oxidation catalyst, the basic injection amount of the hydrocarbon that needs to be supplied to the oxidation catalyst in order to reach the target temperature A basic injection amount determination process for determining an injection amount; The oxidation catalyst when the basic injection amount of the hydrocarbon is supplied based on a first response delay model indicating a response of the outlet temperature of the oxidation catalyst to a change in the supply amount of the hydrocarbon to the oxidation catalyst A first estimation process for estimating a temperature change of the outlet temperature of A second estimation process for estimating the outlet temperature at the inlet temperature based on a second response delay model indicating a response of the outlet temperature of the oxidation catalyst to a change in the inlet temperature of the oxidation catalyst; The deviation is eliminated based on a deviation between the estimated outlet temperature of the oxidation catalyst based on the temperature change of the estimated outlet temperature and the estimated outlet temperature, and the outlet temperature detected by the outlet temperature sensor
  • the first response delay model may be a model represented by a third-order damped vibration transfer function.
  • the second response delay model may be a model represented by a third-order absolute convergence transfer function.
  • the exhaust purification apparatus further includes a lead / lag adjusting means for adjusting a lead / lag of the phase with respect to the deviation, and the feedback calculation means has a correction injection amount for eliminating the deviation after the lead / lag adjustment. You may ask for it.
  • the advance / delay adjustment means may be a filter represented by a secondary advance / delay transfer function.
  • the temperature of the gas supplied downstream of the exhaust via the oxidation catalyst can be controlled appropriately.
  • FIG. 1 is a schematic overall configuration diagram showing an intake / exhaust system of an engine to which an exhaust emission control device according to an embodiment of the present invention is applied.
  • FIG. 2 is a block diagram showing an electronic control unit and related components according to an embodiment of the present invention.
  • FIG. 3 is a diagram for explaining the operation of the inlet temperature processing unit according to the embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a feed-through in the case where the advance / delay adjustment unit according to the embodiment of the present invention is configured with a secondary advance / delay filter, and the case where the advance / delay adjustment unit according to the modification is configured with a primary advance / delay filter. It is a figure explaining the influence of a back gain and noise.
  • FIG. 1 is a schematic overall configuration diagram showing an intake / exhaust system of an engine to which an exhaust emission control device according to an embodiment of the present invention is applied.
  • the diesel engine (hereinafter simply referred to as the engine) 10 is provided with an intake manifold 10a and an exhaust manifold 10b.
  • An intake passage 11 for introducing fresh air is connected to the intake manifold 10a, and an exhaust passage 12 for releasing exhaust gas to the atmosphere is connected to the exhaust manifold 10b.
  • an air cleaner 30, a MAF sensor 31, a supercharger compressor 32a, an intercooler 33, and the like are provided in this order from the intake upstream side.
  • a turbocharger turbine 32b, an exhaust aftertreatment device 20 and the like are provided in order from the exhaust upstream side.
  • the vehicle is provided with an outside temperature sensor 36.
  • the outside air temperature sensor 36 detects the temperature of outside air.
  • the detected value (outside temperature) of the outside temperature sensor 36 is output to an electrically connected ECU (electronic control unit) 40.
  • the exhaust aftertreatment device 20 is configured by arranging a DOC 21 and a DPF 22 in order from the exhaust upstream side in a cylindrical catalyst case 20a. Also, the exhaust pipe injection device 23 is upstream of the DOC 21, the DOC inlet temperature sensor 25 is upstream of the DOC 21, the DOC outlet temperature sensor 26 is between the DOC 21 and the DPF 22, and the DPF outlet temperature sensor is downstream of the DPF 22. 27 are provided. Further, a differential pressure sensor 29 that detects a differential pressure between the upstream side and the downstream side of the DPF 22 is provided before and after the DPF 22.
  • the exhaust pipe injection device 23 is an example of forced regeneration means, and in accordance with an instruction signal including a control injection amount output from the ECU 40, unburned fuel (mainly HC (hydrocarbon)) is supplied into the exhaust passage 12. Spray.
  • unburned fuel mainly HC (hydrocarbon)
  • this in-pipe injection device 23 may be omitted.
  • the injection by the exhaust pipe injection device 23 will be mainly described as an example. However, when post injection is used, the operation with respect to the exhaust pipe injection device 23 and the operation by the exhaust pipe injection device 23 are the same as the engine 10. And the operation by the post injection of the engine 10 may be read.
  • the DOC 21 is formed, for example, by supporting a catalyst component on the surface of a ceramic carrier such as a cordierite honeycomb structure.
  • a ceramic carrier such as a cordierite honeycomb structure.
  • the DPF 22 is formed, for example, by arranging a large number of cells partitioned by porous partition walls along the flow direction of the exhaust gas and alternately plugging the upstream side and the downstream side of these cells.
  • the DPF 22 collects PM in the exhaust gas in the pores and surfaces of the partition walls, and when the amount of accumulated PM reaches a predetermined amount, so-called forced regeneration for performing combustion removal is executed.
  • the forced regeneration is performed by supplying unburned fuel (HC) to the DOC 21 by the in-pipe injection device 23 or post injection, and raising the exhaust temperature flowing into the DPF 22 to the PM combustion temperature (for example, about 600 ° C.). .
  • the DPF 22 has an ability to oxidize unburned HC slipped without being oxidized by the upstream DOC 21.
  • the DOC inlet temperature sensor 25 is an example of inlet temperature detection means, and detects an upstream exhaust gas temperature (hereinafter referred to as inlet temperature) flowing into the DOC 21.
  • the DOC outlet temperature sensor 26 is an example of outlet temperature detection means, and detects the downstream exhaust gas temperature (hereinafter referred to as outlet temperature) flowing out from the DOC 21. This outlet temperature corresponds to the exhaust gas temperature upstream of the DPF 22.
  • the DPF outlet temperature sensor 27 detects the exhaust gas temperature on the downstream side that flows out of the DPF 22 (hereinafter referred to as the DPF outlet temperature). The detection values of these temperature sensors 25 to 27 are output to the electrically connected ECU 40.
  • the ECU 40 performs various controls of the engine 10, the exhaust pipe injection device 23, and the like, and includes a known CPU, ROM, RAM, input port, output port, and the like.
  • FIG. 2 is a block diagram showing an electronic control unit and related components constituting the exhaust gas purification apparatus according to one embodiment of the present invention.
  • the ECU 40 includes a regeneration control unit 41, an inlet temperature processing unit 42, an adjustment unit 43, a basic injection amount determination unit 44, an outlet temperature estimation unit 45, a feedback calculation unit 49, and an addition unit 55. As part of functional elements. Each of these functional elements will be described as being included in the ECU 40 which is an integral hardware, but any one of them can be provided in separate hardware.
  • the regeneration control unit 41 is an example of a regeneration control unit, and starts the forced regeneration process when the detected value of the differential pressure sensor 29 becomes a predetermined value or more.
  • the regeneration control unit 41 outputs an outlet temperature (target temperature: 600 ° C., for example) targeted for the DOC 21 in the forced regeneration process to the adjusting unit 43.
  • the regeneration control unit 41 controls the exhaust pipe injection device 23 so as to inject the controlled injection amount of hydrocarbons input from the addition unit 55.
  • This forced regeneration process is continuously executed, for example, for a predetermined time.
  • the adjusting unit 43 subtracts the inlet temperature after processing in the inlet temperature processing unit 42 from the target temperature input from the regeneration control unit 41 to obtain a temperature difference from the target temperature, and determines the temperature difference as a basic injection amount. Input to the unit 44.
  • the basic injection amount determination unit 44 is an example of a part of the exhaust gas flow rate detection unit and the basic injection amount determination unit, and the temperature difference input from the adjustment unit 43 and a common rail fuel injection device (not shown) within the engine 10.
  • the injection amount (injection amount in the engine) to be injected, the air flow rate from the MAF sensor 31 (an example of a part of the exhaust gas flow rate detection means), and the outside air temperature from the outside air temperature sensor 36 are received.
  • the basic injection amount determination unit 44 calculates the exhaust gas flow rate by adding the in-engine injection amount and the air flow rate.
  • the basic injection amount determination unit 44 based on the calculated exhaust gas flow rate, the temperature difference, and the outside air temperature, an injection amount (basic injection amount) corresponding to the amount of heat necessary for setting the outlet temperature of the DOC 21 to the target temperature. : Feed-forward value).
  • the basic injection amount determined by the basic injection amount determination unit 44 is output to the outlet temperature estimation unit 45 and the addition unit 55.
  • the basic injection amount determination unit 44 determines coefficients of transfer functions and gain values of each unit (inlet temperature processing unit 42, outlet temperature estimation unit 45, feedback calculation unit 49, etc.), and sets each unit. .
  • the coefficient of the transfer function of each part is optimal for a plurality of operating conditions (for example, conditions for at least one of exhaust gas flow rate, inlet temperature, outlet temperature, outside air temperature, or vehicle speed) in those operating conditions.
  • a map in which values are associated with each other may be prepared in advance and determined from the map based on operating conditions detected by a sensor or the like.
  • a map in which correction values for the operating conditions are associated with a plurality of operating conditions is prepared in advance, and a predetermined calculation is performed based on the operating conditions detected by a sensor or the like. You may make it determine by correcting with respect to the value obtained by correcting by the correction value corresponding to the driving
  • the outlet temperature estimation unit 45 estimates the outlet temperature of the DOC 21 in accordance with a DOC response delay model that approximates the response of the outlet temperature of the DOC 21.
  • the outlet temperature estimation unit 45 includes a first estimation unit 46 as an example of first estimation means, a second estimation unit 47 as an example of second estimation means, and an addition unit 48.
  • the first estimation unit 46 is based on a DOC response delay model that approximates a response of the outlet temperature of the DOC 21 to a change in the injection amount of forced regeneration hydrocarbons (a DOC response delay model for a change in injection amount: a first response delay model). Then, the rising temperature of the outlet temperature of the DOC 21 when the basic injection amount of hydrocarbons input from the basic injection amount determining unit 44 is supplied by the in-pipe injection device 23 is estimated, and the estimated rising temperature is output to the adding unit 48 To do.
  • a DOC response delay model that approximates a response of the outlet temperature of the DOC 21 to a change in the injection amount of forced regeneration hydrocarbons
  • the transfer function G r (s) in the complex number s region indicating the DOC response delay model with respect to the injection amount change with respect to the DOC 21 can be expressed by, for example, a third-order damped vibration transfer function shown in Expression (1).
  • G r (s) k r / ((c * s 2 + d * s + 1) (e * s + 1)) (1)
  • kr is a gain
  • c, d, and e are coefficients.
  • the coefficients c and d satisfy the discriminant, that is, satisfy d 2 ⁇ 4 * c * 1 ⁇ 0.
  • the transfer function means a transfer function in a complex number s region.
  • the response of the outlet temperature of the DOC 21 to the change in the injection amount of the forced regeneration hydrocarbon can be approximated with high accuracy.
  • the 1st estimation part 46 is comprised with the filter represented by the tertiary damping
  • Kr K r / ((C * s 2 + D * s + 1) (E * s + 1)) (2)
  • Kr is a gain
  • C, D, and E are coefficients.
  • the second estimation unit 47 calculates the DOC inlet temperature based on a DOC response delay model that approximates the response of the outlet temperature of the DOC 21 to a change in the inlet temperature of the DOC 21 (DOC response delay model for the inlet temperature change: second response delay model).
  • the outlet temperature in the case of the inlet temperature detected by the sensor 25 is estimated, and the estimated outlet temperature is output to the adding unit 48.
  • the transfer function G t (s) indicating the DOC response delay model with respect to the inlet temperature change with respect to the DOC 21 can be expressed by, for example, a third-order absolute convergence transfer function represented by Expression (3).
  • G t (s) k t / (f * s + 1) 3 (3)
  • k t the gain
  • f a coefficient
  • the response of the outlet temperature of the DOC 21 to the change of the inlet temperature of the DOC 21 can be approximated with high accuracy.
  • 2nd estimation part 47 is comprised with the filter represented by the 3rd absolute convergence transfer function shown by Formula (4), for example.
  • K t / (F * s + 1) 3 (4)
  • F is a coefficient
  • the adding unit 48 adds the temperature change of the outlet temperature estimated by the first estimating unit 46 and the outlet temperature estimated by the second estimating unit 47 to obtain the estimated outlet temperature, and feeds the estimated outlet temperature. Output to the back calculation unit 49.
  • the estimated outlet temperature is an outlet temperature (control target temperature) that is a control target of feedback by the feedback calculation unit 49.
  • the inlet temperature processing unit 42 performs advance compensation processing for advancing the response delay until the outlet temperature changes from the change in the injection amount in the first response delay model, with respect to the inlet temperature from the DOC inlet temperature sensor 25.
  • the inlet temperature after the advance compensation processing is output to the adjusting unit 43.
  • the inlet temperature processing unit 42 includes a filter having a third-order advance / delay transfer function expressed by the following equation (5).
  • K t is a gain
  • C, D, E, and F are coefficients.
  • the transfer function shown in Expression (5) of the inlet temperature processing unit 42 includes a denominator component of the transfer function shown in Expression (2) (Expression (1)) as a numerator component, and Expression (4) (Expression (3)) ) Including all components of the transfer function shown in FIG.
  • the inlet temperature processing unit 42 According to the inlet temperature processing unit 42, the delay in the response of the outlet temperature to the change in the injection amount can be reflected in advance with respect to the change in the inlet temperature. For this reason, even if the inlet temperature of the DOC 21 fluctuates, the influence does not appear on the outlet temperature, so that the outlet temperature can be appropriately controlled to the target temperature.
  • the details of the operation and effect of the inlet temperature processing unit 42 will be described later.
  • the feedback calculation unit 49 is an example of a feedback calculation unit, and outputs a correction injection amount (feedback value) for correcting the basic injection amount based on the deviation between the control target temperature and the outlet temperature. Perform feedback control.
  • the feedback calculation unit 49 includes an adjustment unit 50, an advance / delay adjustment unit 51, and a PID calculation unit 52.
  • the adjusting unit 50 calculates a deviation between the control target temperature and the actual outlet temperature by subtracting the outlet temperature from the DOC outlet temperature sensor 26 from the control target temperature input from the outlet temperature estimating unit 45. Is output to the advance / delay adjustment unit 51.
  • the advance / delay adjustment unit 51 is an example of an advance / delay adjustment unit.
  • the advance / delay of the phase is delayed. And output to the PID calculation unit 52.
  • the advance / delay adjustment unit 51 includes, for example, a filter (secondary advance / delay filter) represented by a second-order advance / delay transfer function shown in Expression (6).
  • E e is set in Equation (6).
  • the PID calculation unit 52 has a gain 53 and a PID control unit 54.
  • the gain 53 gives a gain H to the deviation input from the advance / delay adjustment unit 51 and outputs the gain H to the PID control unit 54.
  • the PID control unit 54 performs a calculation on the value input from the gain 53 based on the transfer function represented by Expression (7), and outputs the calculation result to the adding unit 55.
  • the calculation result by the PID control unit 54 corresponds to the corrected injection amount (feedback value).
  • the adder 55 adds the basic injection amount input from the basic injection amount determination unit 44 and the corrected injection amount input from the feedback calculation unit 49 to obtain the control injection amount, and regenerates the control injection amount. Output to the unit 41.
  • the gain and coefficient of the transfer function of the outlet temperature estimation unit 45 As the gain and coefficient of the transfer function of the outlet temperature estimation unit 45, the gain and coefficient of the transfer function of the first response delay model and the second response delay model that match the operating conditions at that time are set. That is, the transfer functions k r , k t , c, d, e, and f of the first response delay model and the second response delay model that match the operating conditions are K r , K t , C, D, and E, respectively. , F.
  • the outlet temperature estimation unit 45 uses the basic injection amount and the inlet temperature as inputs and estimates the control target temperature using the first and second response delay models corresponding to the actual DOC 21.
  • the outlet temperature of the DOC 21 coincides with the possibility that these deviations become zero. That is, there is a high possibility that the deviation output from the adjusting unit 50 of the feedback calculation unit 49 becomes zero. For this reason, there is a high possibility that the corrected injection amount output by the feedback calculation unit 49 becomes zero. For this reason, it is possible to appropriately suppress the occurrence of overshooting and undershooting due to unnecessary insertion of the I term (integral term) of the PID control unit 54.
  • the gains and coefficients of the transfer functions of the inlet temperature processing unit 42 and the outlet temperature estimation unit 45 include the gains and coefficients of the transfer functions of the first response delay model and the second response delay model that match the operating conditions at that time. Is set. That is, the transfer functions k r , k t , c, d, e, and f of the first response delay model and the second response delay model that match the operating conditions are K r , K t , C, D, and E, respectively. , F.
  • the adjusting unit 43 outputs the target temperature ⁇ K t * (inlet temperature after passing through the filter 42) to the basic injection amount determining unit 44.
  • the basic injection amount determination unit 44 calculates the basic injection amount by calculating (target temperature ⁇ K t * (inlet temperature after passing through the filter 42)) / K r and sends the basic injection amount to the outlet temperature estimation unit 45. Output.
  • the first estimating unit 46 Is equivalent to the output shown in the range 63 of FIG. That is, the output of the first estimation unit 46 is equivalent to the target temperature (60) subtracted from the output obtained by inputting the inlet temperature to the filter 61 having the same transfer function as that of the second estimation unit 47. .
  • the filter 61 and the second estimation unit 47 share the same input and the same transfer function, the two output values shown in the range 64 in FIG. 3 are the same. Since the outputs of the filter 61 and the second estimation unit 47 are in opposite phases, they are canceled out by the addition / subtraction unit 62.
  • the target temperature is output as the control target temperature from the adjusting unit 62. Therefore, even if the inlet temperature fluctuates, the influence does not reach the control target temperature.
  • the outlet temperature estimation unit 45 is a model that approximates the actual DOC 21, a situation similar to the state shown in FIG. 3 also occurs in the actual DOC 21. Therefore, when the basic injection amount is supplied, in the DOC 21, even if the inlet temperature fluctuates, the outlet temperature matches the target temperature with high accuracy.
  • the gain and coefficient of the transfer function of the first response delay model that matches the operating conditions at that time are set in the gain and coefficient of the transfer function of the advance / delay adjustment unit 51 and the PID control unit 54. That is, the transfer functions c, d, and e of the first response delay model that matches the operating conditions are set to A (differential gain), B (proportional gain), and E, respectively.
  • Equation 9 the response of the outlet temperature to the control target temperature is expressed as shown in Equation (9).
  • the transfer function of the response delay of the DOC 21 is expressed using the transfer functions of the first response delay model and the second response delay model of the DOC 21 (Equation (1) and Equation (3)). .
  • Equation (8) and Equation (9) In order to absolutely converge the transfer functions of Equation (8) and Equation (9), that is, not to generate overshoot and undershoot, the denominator (G 2 * s 3 + 2 * G * s 2 All of the roots of + s + H * k r ) are real roots, that is, the discriminant of this formula needs to be 0 or more. Therefore, it is necessary that 4-27 * G * H * k r ⁇ 0, that is, H ⁇ 4 / (27 * G * k r ) (10).
  • the advance / delay adjustment unit 51 in the above embodiment is configured by a filter (primary advance / delay filter) represented by a first order advance / delay transfer function represented by Expression (13).
  • the response (transfer function) of the corrected injection amount output from the feedback calculation unit 49 to the control target temperature output from the outlet temperature estimation unit 45 is expressed by Expression (14). It is expressed as follows.
  • H ′ * k r / (G * s 2 + s + H ′ * k r ) (14)
  • H ′ represents the feedback gain in the modified example.
  • Equation 15 the response of the outlet temperature to the control target temperature is expressed as shown in Equation (15).
  • Equation 15 the transfer function of the response delay of the DOC 21 is expressed by using the transfer functions of the first response delay model and the second response delay model of the DOC 21 (Equation (1) and Equation (3)).
  • Expression (16) and Expression (10) representing the feedback gain H when the filter represented by the second-order advance / delay transfer function is used in the advance / delay adjustment unit 51, that is, H ⁇ 4 / (27 * G Comparing * k r ), it can be seen that when the value of G is the same, the feedback gain H ′ is 27/16 1.6875 times the feedback gain H.
  • FIG. 4 is a diagram illustrating a feed-through in the case where the advance / delay adjustment unit according to the embodiment of the present invention is configured with a secondary advance / delay filter, and the case where the advance / delay adjustment unit according to the modification is configured with a primary advance / delay filter. It is a figure explaining the influence of a back gain and noise.
  • FIG. 4 shows the maximum feedback gain that can be obtained when the filter is used on the vertical axis and the output sensitivity to the noise of the outlet temperature signal when the filter is used, and G / E is taken on the horizontal axis. Yes.
  • the feedback gain H ′ can be made larger than the feedback gain H in the embodiment.
  • the embodiment that is, the advance / delay adjustment unit is a secondary advance / delay filter as compared to the modified example. The influence of noise can be reduced.
  • the outside air temperature sensor 36 is provided and the outside air temperature is directly detected.
  • the present invention is not limited to this.
  • a sensor that detects the intake air temperature is provided in the vicinity of the MAF sensor 31. An intake air temperature detected by this sensor may be used as the outside air temperature.
  • the temperature value is used as it is as the temperature related to the exhaust gas such as the inlet temperature, the outlet temperature, the target temperature, and the control target temperature.
  • the present invention is not limited to this.
  • a value obtained by performing predetermined conversion on the gas temperature value (for example, specific enthalpy of exhaust gas) may be used.
  • the concept of temperature referred to in the claims includes not only the case where the temperature value is used as it is, but also a value obtained by performing a predetermined conversion on the temperature.
  • the exhaust purification apparatus of the present invention is useful in that the temperature of the gas supplied downstream of the exhaust via the oxidation catalyst can be appropriately controlled.
PCT/JP2016/072363 2015-07-31 2016-07-29 排気浄化装置 WO2017022674A1 (ja)

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