JP2020051303A - Control unit for exhaust emission control device, and vehicle - Google Patents

Abstract

To provide a control unit for an exhaust emission control device for suppressing the excess of the amount of NOx stored in an LNT without causing the worsening of an operation feeling.SOLUTION: An ECU 43 is provided for an exhaust emission control device 40 arranged in an exhaust passage of an engine 10 and having an LNT 41. The ECU 43 sets execution start conditions to be applied on the basis of a storage NOx amount when starting the execution of rich spike, and changes the applied execution start conditions from first conditions at the time a lock-up clutch of a torque converter 11 connected to the engine 10 is in a non-coupled state and the oil temperature of the torque converter 11 is equal to or higher than a predetermined temperature to second conditions at the time the lock-up clutch is in the non-coupled state, when the storage NOx amount increases up to at least a reference value.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a control device for an exhaust emission control device and a vehicle.

  2. Description of the Related Art As an exhaust purification device provided in an exhaust passage of an internal combustion engine (hereinafter, referred to as an “engine”) mounted on a vehicle, a NOx storage reduction catalyst (Lean NOx Trap: hereinafter, referred to as “LNT”) that purifies NOx in exhaust gas ) Are known.

  Such an LNT stores NOx in the exhaust gas by adhering it as nitrate when the oxygen in the exhaust gas is excessive. Then, in a reducing atmosphere, the LNT reacts the stored NOx with carbon monoxide and the like in the exhaust gas to reduce and release the harmless gas such as nitrogen.

  When the NOx storage proceeds and the NOx is saturated, the LNT cannot store NOx. Therefore, when the NOx of the LNT is saturated, the engine is operated at a rich air-fuel ratio (hereinafter, referred to as "rich spike"), thereby forcibly generating the exhaust gas of the reducing atmosphere and purging the NOx of the LNT. Control is performed (see, for example, Patent Document 1).

  However, depending on the operating state of the engine, NOx purging of the LNT cannot be effectively performed. Therefore, usually, the timing of performing the rich spike is determined by an ECU (Electronic Control Unit) or the like.

JP 2007-270646 A

  By the way, in recent vehicles, there is a tendency that the engine is operated at a lean air-fuel ratio in order to improve fuel efficiency, and NOx is easily stored in LNT. In the LNT, the NOx storage efficiency decreases as NOx approaches a saturated state. From such a viewpoint, there is a demand for increasing the execution frequency of the rich spike.

  On the other hand, rich spikes cause fluctuations in the output of the engine, and thus cause torque shock, which may lead to deterioration in driving feeling.

  The present disclosure has been made in view of the above-described problems, and has been made in consideration of a control device of an exhaust gas purification device that suppresses an excessive amount of NOx stored in an LNT without causing a deterioration in driving feeling, and a vehicle. The purpose is to provide.

The main disclosure for solving the above-mentioned problems is as follows.
A control device for an exhaust gas purification device having a NOx storage reduction catalyst disposed in an exhaust passage of an internal combustion engine,
A storage NOx amount estimating unit for estimating the storage NOx amount stored in the NOx storage reduction catalyst;
A rich spike execution control unit that instructs the internal combustion engine to execute a rich spike based on the stored NOx amount;
With
The rich spike execution control unit,
When the execution of the rich spike is started, an execution start condition to be applied is set based on the stored NOx amount, and when the stored NOx amount increases to a reference value or more, the execution start condition to be applied is set to the internal combustion engine and From the first condition when the lock-up clutch of the connected torque converter is in the non-direct connection state and the oil temperature of the torque converter is equal to or higher than the threshold temperature, the second condition when the lock-up clutch is in the non-direct connection state It is a control device of the exhaust gas purification device that changes to the condition.

In other aspects,
It is a vehicle provided with the control device.

  ADVANTAGE OF THE INVENTION According to the control device of the exhaust gas purification apparatus according to the present disclosure, it is possible to suppress the amount of NOx stored in the LNT from becoming excessive without deteriorating the driving feeling.

The figure which shows the structure of the vehicle which concerns on one Embodiment. FIG. 5 is a diagram illustrating an example of a rich spike start condition according to an embodiment. FIG. 4 is a diagram illustrating an example of an operation flow of a rich spike execution control unit according to one embodiment. Time chart showing the state of each unit at the start of rich spike execution according to one embodiment

[Vehicle configuration]
Hereinafter, a configuration of an exhaust gas purification device according to an embodiment will be described with reference to FIG. In the present embodiment, an embodiment in which the exhaust emission control device of the present invention is applied to a diesel engine vehicle will be described.

  FIG. 1 is a diagram illustrating a configuration of a vehicle 1 according to the present embodiment.

  The vehicle 1 according to the present embodiment includes an engine 10, a torque converter 11, an automatic transmission 12, an intake passage 20, an exhaust passage 30, an air cleaner 21, a turbocharger 22, an EGR device 31, an exhaust purification device 40, and various sensors 51. To 52.

  The engine 10 includes a combustion chamber and a fuel injection device (not shown) for supplying fuel to the combustion chamber. The engine 10 generates power for the vehicle 1 by repeatedly performing an air intake stroke, an air compression stroke, a combustion gas expansion stroke, and a combustion gas exhaust stroke in a combustion chamber. The crankshaft, which is the output shaft of the engine 10, is connected to the torque converter 11.

  The fuel injection device of the engine 10 operates according to a control signal from the engine ECU. When the engine 10 receives a rich spike start command from the ECU 43 (a rich spike execution control unit 43b described later), the engine 10 starts executing a rich spike. For example, when performing a rich spike, the engine 10 controls the fuel injection device using a control map for performing a rich spike. In the control map for executing the rich spike, for example, the engine 10 is operated in a state in which the air-fuel ratio is richer than that in the normal operation (representing the fuel efficiency priority operation; the same applies hereinafter) (for example, when the fuel supply amount is 1). .5 times).

  The engine 10 according to the present embodiment is a four-cylinder engine. The engine 10 branches from an intake passage 20 into four combustion chambers via an intake manifold, and the four combustion chambers are connected to an exhaust passage 30 via an exhaust manifold. It is configured to join.

  The torque converter 11 is a fluid coupling that connects an output shaft of the engine 10 and an input shaft of the automatic transmission 12. The torque converter 11 includes a pump impeller on the input shaft side and a turbine runner on the output shaft side, and performs power transmission between the pump impeller and the turbine runner via hydraulic oil.

  The transmission efficiency between the pump impeller and the turbine runner depends on the viscosity of the hydraulic oil of the torque converter 11, and when the viscosity of the hydraulic oil decreases, the transmission efficiency between the pump impeller and the turbine runner decreases. Getting worse. The viscosity of the hydraulic oil depends on the temperature of the hydraulic oil of the torque converter 11, and when the temperature of the hydraulic oil increases, the viscosity of the hydraulic oil decreases, and the viscosity between the pump impeller and the turbine runner increases. Transmission efficiency will be degraded.

  The torque converter 11 is provided with a lock-up clutch that regulates the operation of the torque converter 11. When the lock-up clutch is engaged, the torque converter 11 directly connects the input shaft side (pump side) and the output shaft side (turbine side) to directly transmit power, and the engagement of the lock-up mechanism is stopped. If released, power is transmitted indirectly via hydraulic fluid.

  The automatic transmission 12 is connected to the torque converter 11, changes the speed of rotation input from the engine 10, and transmits the rotation to drive wheels (not shown). The automatic transmission 12 is, for example, a stepped transmission, and includes a plurality of hydraulic friction engagement elements and a planetary gear device, and the plurality of friction engagement elements are selectively engaged. Thus, it is possible to selectively establish a plurality of gear stages (gear stages).

  The control of the shift speed in the automatic transmission 12 and the control of the lock-up clutch of the torque converter 11 are executed by the transmission ECU.

  The intake passage 20 is a flow passage that draws fresh air (air) from the intake port 20 a and supplies the fresh air to the engine 10. The intake passage 20 is provided with an air cleaner 21, a compressor of a turbocharger 22, and an intake throttle valve 23 in this order from the intake port 20a on the upstream side to the combustion chamber.

  The air cleaner 21 is supplied with air sucked from the air inlet 20a, removes impurities from the air, and sends the air to the turbocharger 22 side.

  The turbocharger 22 rotates the turbine using the pressure of the exhaust gas in the exhaust passage 30, operates the coaxial compressor by the rotational motion of the turbine, compresses the air flowing through the intake passage 20, Send it out to the engine 10 side.

  The intake throttle valve 23 adjusts the amount of air flowing through the intake passage 20.

  The exhaust passage 30 is a passage for discharging the exhaust gas after combustion discharged from the engine 10 to the outside of the vehicle 1. In the exhaust passage 30, an EGR device 31, a turbine of the turbocharger 22, and an exhaust gas purification device 40 are provided in this order from the engine 10 toward the downstream side.

  The EGR device 31 recirculates a part of the exhaust gas flowing through the exhaust passage 30 to the intake passage 20. The EGR device 31 communicates with the exhaust passage 30 and the intake passage 20, and passes through an EGR passage and an EGR passage that allow a part of the exhaust gas discharged from the combustion chamber to the exhaust passage 30 to flow toward the intake passage 20. It is configured to include an EGR cooler for cooling the flowing exhaust gas, an EGR valve for adjusting the amount of the exhaust gas flowing through the EGR passage, and the like.

  The exhaust gas purification device 40 includes an LNT 41, a PM filter 42, and an ECU 43.

  The LNT 41 stores NOx in the exhaust gas when the air-fuel ratio of the exhaust gas is lean. Then, in a state where the air-fuel ratio of the exhaust gas is rich, the LNT 41 reacts the stored NOx with CO or HC or the like in the exhaust gas, and reduces and releases the harmless gas such as nitrogen. As the LNT 41, a known LNT can be used. For example, a catalyst carrier such as alumina on which a catalyst for reducing NOx such as platinum or rhodium and a NOx storage material such as calcium or barium are supported Can be used.

  Note that, as the LNT 41 approaches a saturated state, the efficiency with which NOx can be stored decreases. Therefore, the NOx occlusion state of the LNT 41 is monitored by the ECU 43, and the regeneration (rich spike) of the LNT 41 is periodically executed (details will be described later).

  The PM filter 42 is a filter that traps particulate matter (PM: Particulate Matter) contained in exhaust gas. As the PM filter 42, for example, a porous ceramic such as cordierite or silicon carbide is used.

  The various sensors 51 to 52 are provided to detect the state of each part of the vehicle 1 and the like. Specifically, the various sensors 51 to 52 are provided on the oil temperature sensor 51 for detecting the oil temperature of the hydraulic oil of the torque converter 11 and on the upstream side of the LNT 41 in the exhaust passage 30, and the NOx amount in the exhaust gas ( That is, a NOx sensor 52 for detecting the NOx concentration) is provided. These various sensors 51 to 52 sequentially transmit information obtained by the detection to the ECU 43 as detection signals (dotted arrows in FIG. 1).

  The ECU 43 (corresponding to the “control device” of the present invention) controls the operation of the exhaust gas purification device 40. The ECU 43 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, an output port, and the like. Each function of the ECU 43 described later is realized, for example, by the CPU referring to a control program and various data stored in a ROM, a RAM, and the like. However, it is needless to say that the function is not limited to the processing by software but can also be realized by a dedicated hardware circuit.

  The ECU 43 communicates with various parts of the vehicle 1 such as the engine 10 to control them and receive data from them. Further, the ECU 45 acquires sensor information from various sensors (here, the oil temperature sensor 51, the oxygen concentration sensor 52, and the like) provided in the vehicle 1, and detects the states of the exhaust gas purification device 40 and various parts of the vehicle 1. ing.

[Configuration of ECU]
Next, a detailed configuration of the ECU 43 according to the present embodiment will be described with reference to FIGS.

  The ECU 43 includes a stored NOx amount estimating unit 43a and a rich spike execution control unit 43b.

  The stored NOx amount estimating unit 43a estimates the amount of NOx stored in the LNT 41 (hereinafter, also referred to as “storage NOx amount”). The stored NOx amount estimating unit 43a, for example, sequentially acquires the sensor signal of the NOx sensor 52 and calculates the stored NOx amount per unit time from the NOx amount detected by the NOx sensor 52 and the estimated NOx purification rate of the LNT 41. Then, the stored NOx amount of the LNT 41 is estimated by integrating the stored NOx amount per unit time.

  The method by which the stored NOx amount estimating unit 43a estimates the stored NOx amount of the LNT 41 is arbitrary. Instead of using the sensor signal of the NOx sensor 52, the integrated value of the driving distance or the engine 10 is used. The estimation method based on the integrated value of the fuel injection amount in the above may be used.

  The rich spike execution control unit 43b acquires the NOx amount of the LNT 41 estimated by the stored NOx amount estimation unit 43a, and instructs the engine 10 to execute a rich spike based on the NOx amount. The rich spike execution control unit 43b causes the engine 10 to start executing a rich spike when the NOx storage amount of the LNT 41 increases to a threshold value (for example, 80% of a storage limit of the LNT 41 of 100%). Further, the rich spike execution control unit 43b causes the engine 10 to end the rich spike at a predetermined end timing (for example, the execution time of the rich spike mode) after the engine 10 starts the rich spike.

  However, the rich spike execution control unit 43b according to the present embodiment reduces the rich spike when the transmission efficiency from the engine 10 to the drive wheel side is as low as possible in order to reduce the torque shock generated when the rich spike is started. Start the spike.

  FIG. 2 is a diagram illustrating an example of a rich spike start condition according to the present embodiment.

  The rich spike execution control unit 43b according to the present embodiment has a first condition, a second condition, and a third condition as rich spike start conditions, and the first condition, the first condition, and the second condition according to an increase in the stored NOx amount of the LNT 41. The condition applied as the rich spike start condition is changed in the order of the second condition and the third condition.

  Specifically, when the stored NOx amount Qt of the LNT 41 is equal to or more than the first threshold A1 and less than the second threshold A2 (A1 <A2), the rich spike execution control unit 43b sets the satisfaction of the first condition as a rich spike start condition. When the stored NOx amount Qt of the LNT 41 is equal to or more than the second threshold value A2 and less than the third threshold value A3 (A2 <A3), the satisfaction of the second condition is applied as a rich spike start condition, and the stored NOx amount Qt of the LNT 41 is reduced. If the value is equal to or greater than the third threshold value A3, satisfaction of the third condition is applied as a rich spike start condition.

  Here, the first threshold value A1 is the same value as the reference value when the rich spike execution control unit 43b determines that the execution of the rich spike is necessary. For example, the first threshold value A1 corresponds to the storage limit 100% of the LNT 41. It is set to about 80%. The second threshold value A2 (corresponding to the "reference value" of the present invention) is set to, for example, a value approximately 5% higher than the first threshold value A1, and the third threshold value A3 (the "second reference value" of the present invention) is set. Is set to, for example, a value about 5% higher than the second threshold value A2.

  The first condition is that the lock-up clutch of the torque converter 11 is in a non-directly connected state and the oil temperature of the torque converter 11 (representing the temperature of hydraulic oil in the torque converter 11; the same applies to the following) is a threshold temperature (for example, 100 ° C. This is the time above. When the lock-up clutch is in the non-coupled state, the output from the engine 10 is transmitted to the drive wheels via the hydraulic oil in the torque converter 11, so that the torque shock at the start of the rich spike is reduced. Further, when the oil temperature of the torque converter 11 is high, the viscosity of the working oil in the torque converter 11 decreases, so that the torque shock at the start of the rich spike is reduced. That is, the first condition is a condition in which the torque shock at the start of the rich spike is most relaxed.

  The oil temperature in the torque converter 11 is determined when the vehicle 1 is running based on the time during which the vehicle 1 is running with the lock-up clutch not directly connected and the magnitude of the output of the engine 10. Changes over time. Typically, the oil temperature in the torque converter 11 increases as the vehicle 1 travels with the lock-up clutch in the non-directly connected state and the output of the engine 10 increases.

  The threshold temperature of the oil temperature of the torque converter 11 under the first condition is set based on the temperature at which the viscosity of the hydraulic oil in the torque converter 11 becomes relatively low, and is set, for example, to 80 ° C to 150 ° C.

  The second condition is when the lock-up clutch is in the non-direct connection state. The second condition is different from the first condition and does not impose any restrictions on the oil temperature of the torque converter 11, and is a condition relaxed from the first condition. However, since the second condition is to start the execution of the rich spike when the lock-up clutch is in the non-directly connected state, the second condition is compared with the case where the execution of the rich spike is started when the lock-up clutch is in the directly connected state. Then, the torque shock at the start of the rich spike can be reduced.

  The third condition is when a predetermined time or more has elapsed since the stored NOx amount of the LNT 41 exceeded the third threshold. The third condition is set to prevent the stored NOx amount of the LNT 41 from exceeding the storage limit of the LNT 41 when neither the first condition nor the second condition is satisfied. That is, the third condition is set so that the rich spike is started even when the lock-up clutch is in the directly connected state.

  The control map that defines the rich spike start condition (for example, the first condition, the second condition, and the third condition) referred to by the rich spike execution control unit 43b is stored in advance in the ROM or the like of the ECU 43.

  The rich spike execution control unit 43b includes a NOx amount estimated by the stored NOx amount estimation unit 43a, a signal indicating the state of the lock-up clutch from a transmission ECU (not shown), a sensor signal from the oil temperature sensor 51, and the ECU 43. Based on the time information indicated by the timer built in the CPU, it is determined whether the first condition, the second condition, and the third condition are satisfied.

  FIG. 3 is a diagram illustrating an example of an operation flow of the rich spike execution control unit 43b according to the present embodiment.

  The flowchart shown in FIG. 3 is, for example, executed by the rich spike execution control unit 43b at predetermined intervals (for example, every one second) according to a computer program.

  FIG. 4 is a time chart showing the state of each unit at the start of rich spike execution according to the present embodiment. FIG. 4 shows a state in which the execution of the rich spike is started when the first condition is satisfied. FIG. 4 shows the output torque [N · m] transmitted from the engine 10 to the drive wheels, the operation mode of the engine 10, the rich spike request flag, the state of the lockup clutch, and the oil temperature of the torque converter 11. The chart is shown.

  In FIG. 4, T1 indicates the timing at which the rich spike execution start flag is set, and T2 indicates that the lock-up clutch of the torque converter 11 is in a non-directly connected state and the oil temperature of the torque converter 11 rises to a predetermined temperature Tc or higher. The timing at which the first condition is satisfied is shown.

  Hereinafter, the processing of the flowchart illustrated in FIG. 3 will be sequentially described.

  In step S1, first, the rich spike execution control unit 43b determines whether execution of a rich spike is necessary based on the stored NOx amount Qt of the LNT 41 estimated by the stored NOx amount estimation unit 43a. When the occluded NOx amount Qt of the LNT 41 is equal to or larger than the start threshold value (here, the first threshold value A1) (S1: YES), the rich spike execution control unit 43b sets a rich spike request flag, and proceeds to step S2. (Timing of T1 in FIG. 4). On the other hand, when the occluded NOx amount Qt of the LNT 41 is smaller than the start threshold value (here, the first threshold value A1) (S1: NO), the rich spike execution control unit 43b performs a series of operations in FIG. The operation flow ends.

  In step S2, the rich spike execution control unit 43b sets a rich spike start condition based on the stored NOx amount Qt of the LNT 41 estimated by the stored NOx amount estimation unit 43a. At this time, the rich spike start condition set by the rich spike execution control unit 43b is, as described with reference to FIG. 2, when the stored NOx amount Qt of the LNT 41 is equal to or more than the first threshold A1 and less than the second threshold A2. When the first condition is set as a rich spike start condition, and the stored NOx amount Qt of the LNT 41 is equal to or more than the second threshold value A2 and less than the third threshold value A3, the second condition is set as a rich spike start condition, and the stored NOx amount of the LNT 41 is set. When Qt is equal to or larger than the third threshold value A3, the satisfaction of the third condition is set as the rich spike start condition.

  In step S3, the rich spike execution control unit 43b acquires a signal indicating the state of the lock-up clutch from the transmission ECU, a sensor signal and the like from the oil temperature sensor 51, and satisfies the rich spike start condition set in step S2. It is determined whether or not to perform. Here, when the rich spike start condition is satisfied (S3: YES), the rich spike execution control unit 43b proceeds to step S4. On the other hand, when the rich spike start condition is not satisfied (S3: NO), the rich spike execution control unit 43b returns to step S2, and repeatedly executes the setting of the rich spike start condition and the determination of whether the rich spike start condition is satisfied. I do.

  In step S3, the rich spike execution control unit 43b relaxes the rich spike start condition from the first condition to the second condition and the third condition as the occluded NOx amount Qt of the LNT 41 gradually increases with time. I will do it.

  In step S4, the rich spike execution control unit 43b outputs a rich spike start command to the engine 10. As a result, the engine 10 starts operating in the rich spike mode.

  At the start of the rich spike, as shown in FIG. 4, the output torque of the engine 10 temporarily increases (timing of T2 in FIG. 4). However, when the first condition is satisfied, the degree of transmission of the output torque of the engine 10 to the driving wheel side is small, so that the torque shock at the start of the rich spike is reduced, and the uncomfortable feeling felt by the driver is small. Become.

  In step S5, the rich spike execution control unit 43b determines whether to end the rich spike based on the elapsed time from the start of the rich spike. The rich spike execution control unit 43b waits until the elapsed time from the start of the rich spike exceeds a predetermined time (S5: NO), and in response to satisfying the condition (S5: YES), proceeds to step S6. Proceed.

  In step S6, the rich spike execution control unit 43b outputs a rich spike end command to the engine 10.

  By such processing, the ECU 43 according to the present embodiment can suppress the stored NOx amount of the LNT 41 from becoming saturated while improving the driving feeling.

[effect]
As described above, the ECU 43 (the rich spike execution control unit 43b) of the exhaust purification device 40 according to the present embodiment determines that the lock-up clutch of the torque converter 11 connected to the engine 10 is not directly connected as the condition for starting the execution of the rich spike. And a first condition when the oil temperature of the torque converter 11 is equal to or higher than a predetermined temperature and a second condition when the lock-up clutch is in a non-direct connection state. The first condition is changed to the second condition in accordance with the increase in the amount of NOx stored in the LNT 41.

  Therefore, according to the ECU 43 of the exhaust gas purification device 40 according to the present embodiment, it is possible to improve the driving feeling while suppressing the amount of NOx stored in the LNT 41 from becoming excessive.

(Other embodiments)
The present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in the above-described embodiment, an example of the threshold value referred to when the ECU 43 determines the start of the execution of the rich spike has been described. However, these threshold values may be variously changed according to the type of the LNT 41 and the like. Of course.

  Further, in the above-described embodiment, the aspect including the LNT 41 and the PM filter 42 has been described as an example of the exhaust gas purification device 40. However, it is a matter of course that the aspect may not include the PM filter 42.

  In the above-described embodiment, as an example of the configuration of the ECU 43, the functions of the stored NOx amount estimating unit 43a and the rich spike execution control unit 43b are described as being realized by one computer, but may be realized by a plurality of computers. Of course. For example, the function of the stored NOx amount estimating unit 43a and the function of the rich spike execution control unit 43b may be mounted in separate ECUs.

  In the above-described embodiment, a mode in which the present invention is applied to a diesel engine vehicle will be described as an example of the vehicle 1 to which the ECU 43 is applied. However, the ECU 43 according to the present invention can be applied to a gasoline engine vehicle.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  ADVANTAGE OF THE INVENTION According to the control device of the exhaust gas purification apparatus according to the present disclosure, it is possible to suppress the amount of NOx stored in the LNT from becoming excessive without deteriorating the driving feeling.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Engine 11 Torque converter 12 Automatic transmission 20 Intake passage 21 Air cleaner 22 Turbocharger 23 Intake throttle valve 30 Exhaust passage 31 EGR device 40 Exhaust purification device 41 LNT
42 PM filter 43 ECU
43a Storage NOx amount estimation unit 43b Rich spike execution control unit 51 Oil temperature sensor 52 NOx sensor

Claims (3)

A control device for an exhaust gas purification device having a NOx storage reduction catalyst disposed in an exhaust passage of an internal combustion engine,
A storage NOx amount estimating unit for estimating the storage NOx amount stored in the NOx storage reduction catalyst;
A rich spike execution control unit that instructs the internal combustion engine to execute a rich spike based on the stored NOx amount;
With
The rich spike execution control unit,
When the execution of the rich spike is started, an execution start condition to be applied is set based on the stored NOx amount, and when the stored NOx amount increases to a reference value or more, the execution start condition to be applied is set to the internal combustion engine and From the first condition when the lock-up clutch of the connected torque converter is in the non-direct connection state and the oil temperature of the torque converter is equal to or higher than the threshold temperature, the second condition when the lock-up clutch is in the non-direct connection state Change the conditions. Control device of the exhaust gas purification device. When starting the execution of the rich spike, if the stored NOx amount increases to a second reference value or more, the rich spike execution control unit changes the execution start condition to be applied from the second condition to the stored NOx amount. Is changed to the third condition when the state equal to or more than the threshold value continues for a predetermined time or more,
A control device for an exhaust emission control device according to claim 1.   A vehicle comprising the control device for an exhaust gas purification device according to claim 1.

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