JP2006177188A - PM continuous regeneration method and apparatus with warning system - Google Patents

Abstract

The present invention relates to a particulate matter (PM) in an exhaust purification device, that is, before a diesel engine (DE) stops, a driver is instructed to perform a regeneration operation by a warning light, and the exhaust purification device is instructed. A method for regenerating jammed PM is provided.
A PM continuous regeneration method for continuously regenerating PM in exhaust gas from exhaust gas discharged from a diesel engine through an exhaust purification device, wherein the rotational speed of the diesel engine is equal to or less than a set rotational value. And the cumulative time when the inlet pressure of the exhaust purification device is equal to or higher than the first set pressure value is accumulated by the cumulative cumulative means, and the cumulative time accumulated by the cumulative cumulative means reaches the first set time. The driver is instructed to prepare for regenerative operation, and after the first set time elapses, if the state is not improved and the accumulated time reaches the second set time, the driver is instructed to perform regenerative operation.
[Selection] Figure 2

Description

  The present invention relates to a PM continuous regeneration method including a warning system that completely regenerates particulate matter (PM) collected in an exhaust emission control device in a vehicle equipped with a diesel engine (DE).

The emission regulation value of DE that becomes stricter year by year is that carbon dioxide (CO ₂ ) and water (CO ₂ ) are oxidized by oxidizing PM, hydrocarbon (HC) and carbon monoxide (CO) with a catalyst in the same way as a gasoline engine after 2005. H ₂ O), NO _x must be dissociated to make nitrogen (N ₂ ) and oxygen (O ₂ ) harmless, and then discharged.

  Conventionally, DE for automobiles has tried to reduce harmful substances contained in exhaust gas mainly by improving combustion of the engine itself, but it is considered to be very difficult to conform to exhaust emission regulation values after 2005. ing.

Recently, research and development on a continuously regenerative diesel particulate filter (DPF) composed of a front-stage diesel oxidation catalyst (DOC) and a rear-stage diesel particulate filter (DPF) have been promoted. In the preceding DOC, HC changes to CO ₂ and H ₂ O, and CO changes to CO ₂ . Further, nitrogen monoxide (NO) in NO _x is changed to nitrogen dioxide (NO ₂ ). In the latter stage DPF, the soot component in PM is burned with NO ₂ generated in the former stage and discharged as CO ₂ . This continuous regenerative DPF is known as a CRT invented by Johnson Mathey. Research and development of an integrated DPF (catalyst-supported DPF) in which various oxidation catalysts are supported on a structure DPF having only a filter function is also underway. In the present invention, a DPF having only a filter function is simply a DPF, and a DPF carrying a catalyst is a catalyst-carrying DPF. In the present invention, the continuous regeneration type DPF includes a catalyst-supported DPF, a combination of DOC and DPF, and a combination of DOC and catalyst-supported DPF.

Research and development is also underway for a selective catalyst reduction method (SCR) in which a DeNo _x catalyst is provided after the continuous regeneration type DPF and the last remaining NO _x is also dissociated. An apparatus combining this SCR and the above CRT is known as SCRT from Johnson Mathey.

The combustion of PM in the continuous regeneration type DPF is said to be 350 ° C. or more in the catalyst-carrying DPF and 250 to 450 ° C. in the DOC. The exhaust temperature during normal idling of the DE is 70 to 100 ° C. At a traveling speed of 80 km / hr or less of a vehicle driven by the DE, the load of the DE corresponding to the generated traveling resistance is low, and the exhaust temperature is The problem is that PM that does not reach 260 ° C (250 ° C + α) and is collected in the continuously regenerating DPF accumulates in the filter without being regenerated (oxidized), clogs, and eventually becomes impossible to operate. was there.
JP 2002-322909 A JP 2003-293749 A JP 2001-336440 A JP 2004-19496 A

  For this reason, in Patent Document 1, in addition to the main catalyst, an auxiliary catalyst having a small heat capacity is installed in the vicinity of the engine, and the main catalyst is used at the time of high output of the engine, and the auxiliary catalyst is used at the time of low output. Avoid cooling by long pipes and avoid lowering the specific output of the engine due to the catalyst being installed close to the engine, and using an auxiliary catalyst with a small heat capacity at the start of the engine will increase the temperature in a short time and activate the catalyst It is possible to do.

  Further, in Patent Document 2, an auxiliary catalyst having a small heat capacity is provided in addition to the main catalyst, and an intake throttle, ESC, reduced cylinder, and exhaust throttle can be performed.

  In the DE low load high exhaust temperature maintenance device described in Patent Documents 1 and 2 and Patent Document 3, if it is a disadvantageous condition such as a low load state for a long time, it accumulates inside the catalyst rather than the PM regeneration capability of the catalyst. There was a problem that the state of exceeding the amount of PM continued and the engine eventually misfired.

  In particular, in a 3.0 liter supercharged engine, the DE high exhaust temperature maintenance device at low load described in Patent Document 3 has succeeded in effective exhaust gas rise and continuous PM regeneration, but has an unfavorable condition. Then PM couldn't be played continuously.

  In order to solve such a problem, for example, Patent Document 4 proposes an apparatus that measures the differential pressure across the main DPF using a differential pressure sensor and regenerates PM even in a low load state. However, the device described in Patent Document 4 is based on the premise that an electric injection pump such as a common rail is installed, and has a problem that it cannot be applied to a DE equipped with a mechanical injection pump. In addition, there is a problem that a burner and a heater have to be installed, which is expensive.

  The present invention has been made under the circumstances described above, and the object of the present invention is to perform a regeneration operation by warning the driver when conditions unfavorable for PM regeneration such as low load and idling continue for a long time. And providing a method for continuously regenerating (oxidizing) PM.

  The present invention relates to a PM continuous regeneration method in which exhaust gas discharged from a diesel engine is continuously regenerated through a purification device, and the object of the present invention is to set the rotational speed of the diesel engine to a set value. The accumulated time when the inlet pressure of the exhaust gas purification device is not more than a numerical value and is equal to or higher than the first set pressure value is accumulated by the accumulated accumulation means, and the first accumulated time accumulated by the accumulated accumulation means is When one set time is reached, the driver is instructed to prepare for regenerative operation. After the first set time has elapsed, the state is not improved, and the first accumulated time reaches the second set time. This is effectively achieved by instructing the hand to perform regenerative driving.

  Further, the above-mentioned object of the present invention is that the regeneration operation preparation instruction is to blink a warning light, or the regeneration operation instruction is to turn on the warning light, or the warning light. This is achieved more effectively by turning on and simultaneously sounding a warning sound.

  Further, the above-described object of the present invention is to perform the regeneration operation by operating the engine so that the engine speed is within a certain range and the engine load is within a certain load range. And the duration of the state in which the inlet pressure has reached the second set pressure value or less is counted at regular intervals by the cumulative integration means, and the number of times of the counting blinks the lit warning light. When the number of blinking counts for changing is reached or more, the warning light that has been lit is changed to a blinking state, or the number of counts is turned off to turn off the flashing warning light. When the number of counts for use is reached, the flashing warning light is turned off, and the driver is instructed that the regeneration operation has been completed. This is achieved more effectively.

  The present invention relates to a PM continuous regeneration device including a warning system that continuously regenerates exhaust gas discharged from a diesel engine through an exhaust purification device, and the object of the present invention is to exhaust the exhaust gas from the diesel engine. A main exhaust purification device that collects PM in exhaust gas to be discharged, a rotational speed sensor that detects the rotational speed of the diesel engine, a pressure sensor that detects an inlet pressure of the main exhaust purification device, the diesel engine, A switching valve connected between the main exhaust purification device, an auxiliary exhaust pipe joined from the switching valve between the switching valve and the main exhaust purification device, and between the auxiliary exhaust pipe The rotational speed detected by the connected auxiliary exhaust purification device and the rotational speed sensor is less than or equal to a set rotational numerical value, and the inlet pressure of the exhaust purification device is a first setting. An accumulating means for accumulating the accumulated time in a state where the force value is equal to or greater than the force value; and when the accumulated time accumulated by the accumulated accumulating means reaches a first set time, the driver is instructed to prepare for a regeneration operation, and the first If the state is not improved after the set time elapses and the accumulated time reaches the second set time, it is more effectively achieved by having a warning lamp for instructing the driver to perform the regeneration operation.

  Further, the above object of the present invention is to close the switching valve when the diesel engine has a small exhaust flow rate at a low load, so that the total exhaust gas flow rate from the diesel engine passes through the auxiliary exhaust pipe. By sending the valve to the auxiliary exhaust emission control device and opening the switching valve when the exhaust flow rate increases when the diesel engine is in a high load, or the instruction to prepare for the regeneration operation is a warning light. More effective by flashing, or by instructing the regeneration operation to turn on the warning light, or to sound a warning sound at the same time as turning on the warning light. Is achieved.

  The above object of the present invention is to perform the regeneration operation by operating the engine so that the engine speed is within a certain range and the engine load is within a certain load range, and The duration of the state in which the inlet pressure has reached the second set pressure value or less is counted at regular intervals by the cumulative integration means, and the number of times of counting changes the lit warning light to blinking. When the number of flashing counts for reaching the number of times, the warning lamp that has been turned on is changed to a flashing state, or the number of counts is turned off to turn off the warning light that has been flashing. When the number of times is reached, the warning light that has been flashing is turned off, and the driver is instructed that the regeneration operation has been completed.

  According to the PM continuous regeneration method provided with the warning system at the time of low load of the diesel engine of the present invention, even if a condition unfavorable for PM regeneration at the time of DE low load and idling continues and PM is clogged in the exhaust purification device. By flashing / lighting the warning light and instructing the driver to perform the regenerative driving, the fuel economy has deteriorated as in the conventional case, and the problem that the engine stops can be solved. In addition, if the driver can continuously regenerate PM by performing the regenerative operation, the warning light is turned off so that normal operation can be performed, fuel consumption is improved, and PM can be continuously regenerated. Became.

  It is said that an exhaust temperature of 260 ° C. or higher is required to regenerate (oxidize) PM with an exhaust purification device. When the vehicle driven by the DE is traveling at low speed or idling, the load of the DE is low, the exhaust temperature does not reach 260 ° C, and the PM collected by the exhaust purification device is not regenerated in the filter. It accumulates and the filter becomes clogged, and eventually it becomes impossible to operate. The present invention is characterized by instructing the driver with a warning system before the operation becomes impossible, and performing a regeneration operation for regenerating the exhaust purification device. Note that the warning is terminated when the clogging of the exhaust purification device is resolved and the PM can be regenerated.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an example of an apparatus (engine system) equipped with a PM continuous regeneration method equipped with a warning system of the present invention.

  The air that has passed through the air cleaner 1 passes through the intake throttle valve 2, is sent into the DE3 cylinder (the cylinder is not shown), and is mixed with the fuel injected in the DE3 cylinder and burned. The combusted exhaust gas passes through the exhaust manifold 4 and is sent to the auxiliary exhaust purification device 8 through the auxiliary exhaust pipe 6 provided downstream of the exhaust manifold 4. The exhaust gas purified by the auxiliary exhaust purification device 8 passes through the auxiliary exhaust pipe 6, passes through the main exhaust pipe 7, is further purified by the main exhaust purification device 9, and is discharged. As the main exhaust gas purification device 9 and the auxiliary exhaust gas purification device 8, DOC and DPF, DOC and catalyst-carrying DPF, catalyst-carrying DPF, and the like are used. When the DE 3 is idling or when the load is low, the switching valve 5 is closed so that all exhaust gas is sent to the auxiliary exhaust purification device 8. Since the auxiliary exhaust purification device 8 has a smaller capacity than the main exhaust purification device 9, the exhaust resistance increases and the exhaust pressure rises, so the amount of exhaust gas passing through the EGR valve 11 increases. Further, by restricting the intake throttle valve 2 to an appropriate opening degree, it is possible to increase the amount of exhaust gas recirculated through the EGR valve 11 and recirculated into the cylinder even when the amount of fresh air decreases. Since the hot exhaust gas is recirculated into the cylinder, the gas temperature after completion of the intake stroke in the cylinder rises. Further, since the amount of fresh air is reduced, the burning out of the combustion is delayed, the temperature of the exhaust gas discharged from the engine is increased, and the temperature of the auxiliary exhaust purification device 8 is rapidly increased. Further, the exhaust gas is prevented from being cooled while passing through the main exhaust pipe 7. When DE3 is at a high load, the exhaust gas that has opened the switching valve 11 and passed through the exhaust manifold 4 is purified by both the auxiliary exhaust purification device 8 and the main exhaust purification device 9 through the auxiliary exhaust pipe 6 and the main exhaust pipe 7. The The switching valve 5 and the EGR valve 11 are controlled by the ECU 10.

  Further, the DE 3 is provided with a rotational speed sensor (not shown) for detecting the engine rotational speed Ne, and the inlet pressure of the main exhaust purification device 9 is located near the joint between the main exhaust purification device 9 and the main exhaust pipe 7. A pressure sensor 12 for detecting P is provided.

  When the rotational speed Ne detected by the rotational speed sensor is less than the set rotational numerical value Ne1, and the pressure of the inlet pressure of the main exhaust gas purification device 9 detected by the pressure sensor 12 reaches a state equal to or higher than the first set pressure value P1, The accumulating means is activated to accumulate the accumulated time in this state.

  The set rotational value Ne1 of the DE rotational speed Ne can be changed as appropriate according to the DE format, etc., with the rotational speed slightly higher than the rotational speed Ne during low-speed running or idling as the set rotational numerical value Ne1.

  When the vehicle driven by DE is traveling at low speed or idling, the exhaust purification device cannot regenerate PM as described above, and PM accumulates in the exhaust purification device, causing clogging, and exhaust purification. The inlet pressure of the device increases. The pressure when PM is clogged in the exhaust purification apparatus and there is a possibility that DE may stop is set as the first set pressure value P1. The first set pressure value P1 can be appropriately changed according to the type of the exhaust purification device and the like.

  In addition, you may abbreviate | omit the switching valve 5, the auxiliary exhaust pipe 6, and the auxiliary exhaust purification apparatus 8 as needed.

  The present invention issues a warning to instruct a regeneration operation (reset operation) as described below using the engine system as shown in FIG. FIG. 2 is an overall flowchart showing an overall flow of the PM continuous regeneration method provided with the warning system of the present invention.

  First, DE is started and normal operation is performed (step 201).

  In normal operation, the accumulated time t1 when the rotation speed Ne of the DE3 is less than the set rotation value Ne1 and the inlet pressure P of the main exhaust gas purification device 9 exceeds the first set pressure value P1 is accumulated by the cumulative accumulation means. Integration is performed (step 202).

  It is determined whether the accumulated time t1 has reached a preset first set time T1 (step 203). If the accumulated time t1 has not reached the first set time T1, the routine returns to step 202 and normal operation is continued.

  When it is determined by the cumulative integration means that the integration time t1 has exceeded the first set time T1, a warning lamp is blinked to instruct the driver to prepare for the regeneration operation. In this state (a state where the rotational speed Ne is less than the set rotational numerical value Ne1 and the inlet pressure P of the main exhaust purification device 9 exceeds the first set pressure value P1), the exhaust temperature reaches 260 ° C. Therefore, PM cannot be regenerated by the main exhaust gas purification device 9. Therefore, PM is starting to clog the filter in the main exhaust gas purification device 9. If the clogging of the filter in the main exhaust gas purification device 9 is left as it is, the DE may stop.

  Even when the first set time T1 has elapsed, the state where the rotation speed Ne is less than the set rotation value Ne1 and the inlet pressure P of the main exhaust purification device 9 exceeds the first set pressure value P1 is continued. If it is determined that the second set time T2 has been exceeded, the flashing warning light is turned on and a warning sound is emitted to instruct the driver to perform a regeneration operation (reset operation) (step 204).

  When the regeneration operation is continued, the rotation speed Ne is within a constant region, and the inlet pressure P reaches a state of less than the second set pressure value P2, the duration of this state is counted at regular intervals. The number of times is accumulated by the accumulating means (hereinafter, a count at a certain interval is referred to as count T3). When the number of counts T3 accumulated by the accumulating means is greater than or equal to the blinking count number N1 and also greater than or equal to the extinguishing count number N2 (when the reset condition is reached), a warning light that is blinking or lit Is turned off, and the driver is instructed that the regeneration operation may be stopped and the normal operation may be performed (step 205).

  When the continuation of the regeneration operation is released in a state where the number of each count T3 is less than the blinking count number N1 and the turn-off count number N2, the process returns to step 204 and the regeneration operation is continued again.

  Thus, the present invention warns the driver with the warning light or the like before the DE stops that the exhaust temperature is lowered due to low-speed traveling or the like and the PM cannot be regenerated by the main exhaust gas purification device 9. Instruct the driver to regenerate with the light.

  FIG. 3 is a flowchart showing in detail the flow from normal operation until the warning lamp blinks / lights up. That is, FIG. 3 is a flowchart showing in detail the flow from step 201 to step 204 in FIG.

  In step 301 and step 302, the DE is started and normal operation is performed.

  It is determined whether the rotation speed Ne of the DE detected by the rotation sensor is less than the set rotation value Ne1 (step 303). When the rotation speed Ne is equal to or higher than the set rotation speed Ne1, the process returns to step 303 and the normal operation is continued.

  When the rotational speed Ne is less than the set rotational numerical value Ne1, it is determined whether the inlet pressure P of the main exhaust gas purification device 9 detected by the pressure sensor 12 exceeds the first set pressure value P1 (step 304). When the inlet pressure P is equal to or lower than the first set pressure value P1, the process returns to step 303 and the normal operation is continued.

  In step 303, the accumulated time t1 in a state where the rotation speed Ne is less than the set rotation value Ne1 and the inlet pressure P exceeds the first set pressure value P1 in step 304 is accumulated by the accumulation integration means (step 305). It is determined whether the accumulated time t1 exceeds the first set time T1 (step 306). The reference for setting the first set time T1 can be changed as appropriate according to the type of DE3, the type of the main exhaust gas purification device 9, and the like. Although PM is not completely clogged and DE3 stops, it is preferable to use the time when DE3 may stop as long as this state continues for a while. When the integration time t1 does not exceed the first set time T1 and the inlet pressure P reaches the first set pressure value P1 or less, the normal operation is continued by returning to step 303 without performing the integration of the integration time t1.

  When the cumulative integration means determines that the integration time t1 has exceeded the first set time T1, the warning lamp blinks and instructs the driver to prepare for the regeneration operation (step 307). Note that it is not necessary to limit the method to blinking the warning light, and it may be replaced with a warning light as long as the driver can be instructed to prepare for the regeneration operation. As a method of instructing the driver, for example, the driver can be instructed by voice, or a buzzer or the like can be substituted.

  Further, it is determined by the cumulative integration means whether the integration time t1 exceeds the first setting time T1 and exceeds the second setting time T2 set to a time longer than the first setting time T1 (step 308). When the integration time t1 does not exceed the second set time T2 and the inlet pressure P reaches the first set pressure value P1 or less, the normal operation is continued by returning to step 303 without performing the integration of the integration time t1.

  When it is determined by the accumulating means that the accumulated time t1 has exceeded the second set time T2, a warning lamp is turned on (step 309), and a regenerative operation (reset operation) is instructed to the driver (step 310). When the accumulated time t1 exceeds the second set time T2, there is a high possibility that the DE will stop, so it is possible to warn (instruct) the driver with a buzzer or the like. Note that the method is not limited to the method of turning on the warning lamp, and may be replaced with the warning lamp as long as the driver can be instructed to perform the regeneration operation. As a method of instructing the driver, for example, the driver can be instructed by voice, or a buzzer or the like can be substituted.

  FIG. 4 is a flowchart showing in detail the flow from when the regeneration operation is performed until the warning is canceled. That is, it is a flowchart showing in detail the flow from step 204 to step 205 in FIG.

  The driver whose warning lamp is lit and instructed to perform the regeneration operation performs the regeneration operation (step 401). The regeneration operation refers to performing so-called high-speed traveling, and means that the engine speed L is set to be within a constant load while the rotation speed Ne is within a constant region higher than that during low-speed traveling or idling. By operating the engine so that the engine speed L is within a constant load and the engine speed L within a certain range, the exhaust temperature becomes 260 ° C. or higher. If the exhaust temperature reaches 260 ° C. or higher, PM clogged in the filter in the main exhaust purification device 9 can be regenerated, and the DE 3 can be prevented from stopping. Here, the constant region of the rotational speed Ne can be appropriately changed according to the engine type, gear ratio, tire, etc. For example, when the maximum engine rotational speed is 3200 rpm, the lower limit rotational speed Ne3 is 1800. About 2000 rpm is preferable, and the upper limit rotation speed Ne2 is preferably about 2800-3000 rpm. Even if the upper limit rotational speed Ne2 exceeds 2800 to 3000 rpm, the exhaust temperature can be raised, but this is not preferable because the fuel efficiency deteriorates.

  By performing the regeneration operation, it is determined whether or not the engine is operated so that the rotational speed Ne is within a constant region and the engine load L is within a constant load (step 402). When the rotational speed Ne is within a certain range and the engine load L is not within the certain load, the regeneration operation is further continued.

  When the regeneration operation is being performed so that the rotational speed Ne is within a certain region and the engine load L is within a certain load, it is determined whether the inlet pressure P is less than the second set pressure value P2 ( Step 403). The second set pressure value P2 is smaller than the first set pressure value P1, the exhaust temperature reaches 260 ° C. or higher, the PM clogging is improved in the main exhaust purification device 9, and the regeneration can be performed. Inlet pressure reached. If the inlet pressure P is equal to or higher than the second set pressure value P2, the process returns to step 402 and the regeneration operation is continued.

  The regeneration operation is continued, the engine is operated so that the rotational speed Ne is within a certain range, the engine load L is within a certain load, and the inlet pressure P has reached a state below the second set pressure value P2. Judgment is made (step 404). If it is determined that this state has not been reached, the process returns to step 402 to continue the regeneration operation.

  When the regeneration operation is continued, the engine speed Ne is within a certain range, the engine load L is within a certain load, and the inlet pressure P reaches a state below the second set pressure value P2. The accumulated time in this state is counted at regular intervals (count T3), and the number of times of each count T3 is accumulated by the accumulating means (step 405). The count T3 can be appropriately changed according to the engine type and the like, but for example, it is preferable to count at an interval of 1 to 10 seconds. When the number of counts T3 accumulated by the accumulating means is equal to or greater than the blinking count number N1 (step 406), the lit warning light is changed to blinking (step 407). Note that the setting reference for the blinking count number N1 is set so that the inlet pressure P of the main exhaust purification device 9 is equal to or less than the first set pressure value P1.

  If the regeneration operation is canceled while the number of counts T3 is less than the blinking count number N1 and the turn-off count number N2, the process returns to step 402 and the regeneration operation is continued again.

  It is determined whether the number of counts T3 is equal to or greater than the blinking count number N1 and further equal to or greater than the turn-off count number N2 (step 408). The setting reference for the turn-off count number N2 is set so that the inlet pressure P of the main exhaust purification device 9 is less than the second set pressure value P2. When it is determined that the number of counts T3 is equal to or greater than the turn-off count number N2, the warning lamp is turned off, and an alarm device such as a buzzer is stopped as necessary. That is, the regeneration operation instruction is canceled (step 410). After the regeneration driving instruction is released, the driver performs normal driving (step 411). When the warning light goes off, all integrated values are reset. If it is determined that the number of counts T3 is less than the turn-off count number N2, the process returns to step 402 to continue the regeneration operation.

  In addition to the method of counting at regular intervals as described above, for example, when the accumulated time is accumulated as it is and the set time for blinking the warning light is exceeded, the warning light that has been lit is changed to blinking. When the set time for turning off is exceeded, the flashing warning light may be turned off.

  As mentioned above, although this invention was demonstrated in detail, this invention is not limited to the content mentioned above. For example, in FIG. 1, the present invention can be implemented even when the switching valve 5 and the auxiliary exhaust purification device 8 are not provided, and can be connected to a DE-equipped vehicle that is already used.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to this.

  FIG. 5 is a timing chart when the test is actually performed until the warning light is turned on and blinking.

  The time when the engine speed Ne is less than the set speed value Ne1 and the inlet pressure P of the main exhaust gas purification device 9 is equal to or higher than the first set pressure value P1 is calculated as the flashing time integration and the lighting time integration ( Hereinafter, it is integrated by a cumulative integration means). Even if the inlet pressure P is equal to or higher than the first set pressure value P1, it is not integrated when the rotational speed Ne is equal to or higher than the set rotational speed Ne1. Further, even if the rotational speed Ne is equal to or lower than the set rotational speed Ne1, even when the inlet pressure P is equal to or lower than the first set pressure value P1, it is not integrated by the cumulative integration means.

  A warning light when the engine speed Ne is less than the set speed value Ne1 and the accumulated time of the time when the inlet pressure P of the main exhaust purification device 9 is equal to or greater than the first set pressure value P1 exceeds the first set time T1 Flashes and instructs the driver to prepare for regeneration. In addition, when the second set time T2 set longer than the first set time T1 is exceeded, the warning light shifts from flashing to lighting, and in some cases, a buzzer sounds and is regenerated to the driver. Instruct driving.

  FIG. 6 is a timing chart when the state until the warning light is turned off after actually performing the regeneration operation is actually tested.

  The engine speed L is within the range of the lower limit engine load L2 and the upper limit engine load L1 and the inlet pressure P is within the range of the rotational speed Ne of the lower limit engine speed Ne3 and the upper limit engine speed Ne2. When the pressure is less than the second set pressure value P2, for example, every 5 seconds is set as a count T3, and the number of each count T3 is integrated by a blinking count number N1 and a turn-off count number N2 (hereinafter referred to as cumulative integration means). . Note that if any one of the rotational speed Ne, the engine load L, and the inlet pressure P is outside the above-described setting range, the count T3 is not integrated.

  When the cumulative number of counts T3 is greater than or equal to the blinking count number N1, the lit warning light is switched to blinking. Further, when the cumulative number of counts T3 exceeds the turn-off count number N2, the flashing warning light is turned off.

  When the warning light is extinguished, all accumulated values accumulated by the accumulating means (flashing count number N1, extinguishing count number N2, blinking time integration and lighting time) are reset. At this time, the integrated value integrated at the blinking / lighting integrated times t1, t2 is also reset.

It is a figure which shows an example of the Example of this invention. It is a whole flowchart which shows the whole flow of this invention. It is a flowchart which shows the flow until the warning lamp of this invention blinks and lights. It is a flowchart which shows the flow until it resets the warning light of this invention. It is a timing chart of lighting / extinguishing of the warning lamp of the present invention. It is a timing chart in the case of turning off the warning lamp of the present invention.

Explanation of symbols

1 Air cleaner 2 Intake valve 3 Diesel engine (DE)
4 exhaust manifold 5 switching valve 6 auxiliary exhaust pipe 7 main exhaust pipe 8 auxiliary exhaust purification device 9 main exhaust purification device 10 ECU
11 EGR valve 12 Pressure sensor

Claims (15)

  Exhaust gas discharged from a diesel engine is a PM continuous regeneration method for continuously regenerating PM in the exhaust gas through an exhaust purification device, wherein the rotational speed of the diesel engine is equal to or less than a set rotational value, and When the accumulated time when the inlet pressure of the exhaust gas purification apparatus is equal to or higher than the first set pressure value is accumulated by the cumulative accumulation means, and the accumulated time accumulated by the cumulative accumulation means reaches the first set time, the driver is Regeneration operation preparation is instructed, and after the first set time elapses, if the state is not improved and the accumulated time reaches the second set time, the driver is instructed to perform the regeneration operation. PM continuous regeneration method with system.   The PM continuous regeneration method with a warning system according to claim 1, wherein the instruction for preparation for regeneration operation is to blink a warning light.   The PM continuous regeneration method with a warning system according to claim 1, wherein the regeneration operation instruction is to turn on the warning lamp.   The PM continuous regeneration method with a warning system according to claim 1, wherein a warning sound may be generated simultaneously with turning on the warning light.   The warning system according to any one of claims 1 to 4, wherein the regeneration operation is an operation in which the engine speed is set within a certain range and an engine load is within a certain load range. PM continuous regeneration method.   The regeneration operation was performed and the duration of the state in which the inlet pressure reached a second set pressure value or less was counted at regular intervals by the cumulative integration means, and the number of counts was lit. The PM continuous with the warning system according to any one of claims 1 to 5, wherein when the number of flashing counts for changing the warning light to blinking is reached, the warning light that has been lit is changed to a blinking state. Playback method.   When the number of counts reaches or exceeds the number of counts for turning off to turn off the flashing warning light, the flashing warning light is turned off and the driver is instructed that the regeneration operation has ended. A PM continuous regeneration method comprising the warning system according to any one of claims 1 to 6.   A main exhaust gas purification device that collects PM in exhaust gas discharged from a diesel engine, a rotation speed sensor that detects the rotation speed of the diesel engine, a pressure sensor that detects an inlet pressure of the main exhaust gas purification device, A switching valve connected between the diesel engine and the main exhaust purification device, an auxiliary exhaust pipe joined from the switching valve between the switching valve and the main exhaust purification device, and the auxiliary exhaust The auxiliary exhaust purification device connected between the pipes and the rotational speed detected by the rotational speed sensor are equal to or lower than a set rotational numerical value, and the inlet pressure of the exhaust purification device is equal to or higher than a first set pressure value. An accumulating means for accumulating the accumulated time of the state, and when the accumulated time accumulated by the accumulated accumulating means reaches a first set time, the driver is instructed to prepare for a regenerative operation, and the first set time A PM continuous regenerating apparatus having a warning system, comprising: a warning light that instructs the driver to perform a regenerative operation when the state is not improved later and the accumulated time reaches a second set time .   When the diesel engine has a small exhaust flow rate when the load is low, the switching valve is closed so that the entire exhaust gas flow rate from the diesel engine is sent to the auxiliary exhaust purification device through the auxiliary exhaust pipe. The PM continuous regeneration apparatus having a warning system according to claim 8, wherein the switching valve is opened when the exhaust gas flow rate increases at a high load of the diesel engine.   The PM continuous regeneration apparatus with a warning system according to claim 8, wherein the instruction for preparation for regeneration operation is to blink a warning light.   The PM continuous regeneration apparatus having a warning system according to claim 8, wherein the regeneration operation instruction is to turn on the warning lamp.   The PM continuous reproduction apparatus provided with a warning system according to claim 8, wherein a warning sound may be generated simultaneously with turning on the warning light.   The warning system according to any one of claims 8 to 12, wherein the regeneration operation is an operation in which the engine speed is set within a certain range and an engine load is within a certain load range. PM continuous playback device.   The regeneration operation was performed and the duration of the state in which the inlet pressure reached a second set pressure value or less was counted at regular intervals by the cumulative integration means, and the number of counts was lit. The PM continuous equipped with the warning system according to any one of claims 8 to 13, wherein when the number of flashing counts for changing the warning light to blinking is reached, the warning light that has been lit is changed to a blinking state. Playback device.   When the number of counts reaches or exceeds the number of counts for turning off to turn off the flashing warning light, the flashing warning light is turned off and the driver is instructed that the regeneration operation has ended. A PM continuous regeneration apparatus comprising the warning system according to any one of claims 8 to 14.

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