JP2016070246A - Dpf regeneration system for vehicle with pto device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DPF regeneration system of a vehicle with a PTO device capable of implementing DPF regeneration at PTO even in a vehicle with a PTO device.SOLUTION: A DPF regeneration system of a vehicle with a PTO device for automatically regenerating DPF in a vehicle in which the PTO device 40 is mounted, includes PTO detecting means 50 for detecting whether the PTO device 40 is driven, ordinary automatic regeneration means 51 for implementing ordinary DPF automatic regeneration when the PTO detecting means 50 detects that the PTO is OFF, and PTO automatic regeneration means 52 for keeping a temperature of an exhaust gas flowing into the DPF to be lower than a temperature of an exhaust gas for the ordinary DPF regeneration, and regenerating the DPF for a period of regeneration time longer than a period of time spent for the ordinary DPF automatic regeneration, when the PTO detecting means 50 detects that the PTO is ON.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a DPF regeneration system for a vehicle with a PTO device for regenerating the DPF in a vehicle with a PTO device that drives a bodywork such as a pump car.

  There is an exhaust gas aftertreatment device that collects PM (diesel particulate matter) discharged together with exhaust gas from a diesel engine by a DPF (diesel particulate filter). In this exhaust gas after-treatment device, when the amount of PM accumulated in the DPF exceeds a set value, the DPF is clogged, and therefore various DPF regeneration systems that raise the exhaust gas temperature and burn and remove PM have been proposed.

  The DPF regeneration system detects the pressure at the inlet / outlet of the DPF with a differential pressure sensor, and when the differential pressure exceeds a set value, the exhaust gas temperature is changed to an oxidation catalyst (upstream of the DPF) by multi-injection into the cylinder. DOC) is raised above the catalyst activation temperature, and then post-injection into the cylinder and exhaust pipe injection by the exhaust pipe injector are used to supply unburned fuel (HC) into the exhaust gas, which is then used as an oxidation catalyst. By oxidizing, the exhaust gas temperature is raised to around 600 ° C., whereby PM deposited on the DPF is burned and removed.

  By the way, even a vehicle with a PTO (power take-off) device that drives a bodywork such as a pump car is provided with a post-processing device provided with a DPF. However, when the PTO device is being driven, the vehicle remains stopped. When the DPF is regenerated during this PTO, the exhaust gas exhausted from the exhaust muffler is a high-temperature gas after PM combustion. There is a problem that vehicle tires are subject to heat damage.

  Further, even if the heat damage of the tire can be prevented, it is difficult to avoid the heat damage because the road surface area becomes hot due to the high temperature gas.

  For this reason, during the PTO, the regeneration of the DPF is prohibited (Patent Documents 1 and 2). This is because it has been considered that there is no problem even if the DPF regeneration is not performed during PTO because the time for which the PTO device is normally used is short.

JP 2008-180154 A JP 2012-2066 A

  However, in the case of a vehicle with a PTO device that always uses the PTO device, DPF regeneration is necessary, and therefore, the above-described thermal damage is an unavoidable problem.

  Accordingly, an object of the present invention is to solve the above problems and provide a DPF regeneration system for a vehicle with a PTO device that can perform DPF regeneration at the time of PTO even for a vehicle with a PTO device.

  In order to achieve the above object, the present invention provides a DPF regeneration system for a vehicle equipped with a PTO (power take-off) device and equipped with a PTO device for automatically regenerating the DPF, wherein the PTO device is driven. PTO detection means for detecting whether or not, PTO detection means, normal automatic regeneration means for performing normal DPF automatic regeneration when PTO is OFF, and exhaust gas temperature flowing into the DPF when PTO is ON with PTO detection means And a PTO automatic regeneration means for regenerating DPF over a regeneration time longer than the normal DPF automatic regeneration time while maintaining the exhaust gas temperature lower than the exhaust gas temperature during normal DPF regeneration It is.

  A normal / PTO regeneration progress map storing a regeneration control line in which an exhaust gas temperature with respect to a time from the start to the end of DPF regeneration is stored during the normal automatic DPF regeneration and the PTO automatic regeneration; When the PTO is switched from ON to OFF or from OFF to ON by the PTO detection means, switching from the PTO automatic playback to the normal automatic playback, or from the normal automatic playback to the PTO automatic playback, and at the time of switching Is output to the normal automatic playback means or PTO automatic playback means, and the normal automatic playback means or the PTO automatic playback means controls the remaining automatic playback from the playback progress status at the time of switching to the end of playback. Is preferred.

  When the PTO device is ON and when the PTO automatic regeneration is started by the PTO automatic regeneration means, it is detected whether the engine is idling or not, and when the engine is idling, the idle speed is gradually increased. Idle-up limiting means that includes an idle-up means and limits the number of revolutions to be idled up by the idle-up means during the PTO automatic regeneration based on the exhaust gas temperature from the engine or based on the limited drive rotational speed of the PTO device Is preferably provided.

  The PTO automatic regeneration is provided with a PTO accelerator exhaust control means for opening the exhaust brake valve and continuing the automatic PTO regeneration when the fuel injection amount and the engine speed are equal to or greater than the set values and the PTO device is driven. Is preferred.

  In the PTO automatic regeneration, PTO automatic regeneration interruption means for interrupting PTO automatic regeneration when the fuel injection amount and the engine speed are equal to or higher than the set values, the PTO device is not driven, and the set time and the exhaust gas temperature are equal to or lower than the set values. Is preferably provided.

  It is preferable that a deposition display device capable of recognizing the accumulated amount of DPF and a reproduction display device capable of recognizing PTO automatic regeneration are disposed on the PTO accelerator of the PTO device.

  In addition to normal automatic regeneration, the present invention is based on PTO automatic regeneration means having a low exhaust gas temperature and a long regeneration time, and is capable of performing automatic PTO regeneration while preventing thermal damage during regeneration during PTO. Demonstrate the effect.

It is a system diagram showing an embodiment of the present invention. In this invention, it is a figure which shows the normal reproduction | regeneration of DPF, and a PTO automatic reproduction | regeneration progress map. It is a figure explaining the flow of the DPF regeneration system of vehicles with a PTO device of the present invention.

  A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 shows an outline of a DPF regeneration system for a vehicle with a PTO device.

  An intake pipe 13 and an exhaust pipe 14 are connected to the intake manifold 11 and the exhaust manifold 12 of the engine 10, and a compressor 16 and a turbine 17 of a variable blade turbocharger 15 are provided on the intake pipe 13 and the exhaust pipe 14. .

  The intake air is boosted by the compressor 16 and cooled by the intercooler 18, and the intake air is appropriately throttled by the intake throttle valve 19 and flows into each cylinder of the engine 10 from the intake manifold 11. In each cylinder, the exhaust gas, which is injected with fuel from the fuel injection valve 20 and burned and exploded, drives the turbine 17 from the exhaust manifold 12 and is then exhausted to the exhaust pipe 14. A part of the exhaust gas in the exhaust manifold 12 is returned to the intake manifold 11 via an EGR cooler 22 and an EGR valve 23 in an EGR (exhaust gas recirculation) pipe 21 in order to reduce the amount of NOx generated in the exhaust gas. It has become.

  An exhaust brake valve 25 composed of a magnetic valve is connected to the exhaust pipe 14, and a post-processing device 28 composed of a DOC 26 and a DPF (DPF with catalyst) 27 is connected to the exhaust pipe 14. The exhaust gas from the turbine 17 passes through the DOC 26, and PM in the exhaust gas is collected and removed by the downstream DPF 27, and then exhausted to the atmosphere. Further, when the DPF 27 is regenerated, the exhaust gas temperature is raised by being oxidized by the DOC 26 which is unburned fuel (HC) in the exhaust gas, and the PM deposited on the DPF 27 is burned and removed by the high temperature exhaust gas.

  The intake pipe 13 on the upstream side of the compressor 16 is provided with a muff flow sensor 30 for detecting the intake air amount, and the first exhaust temperature for detecting the temperature of the exhaust gas flowing into the post-processing device 28 is provided on the inlet side of the DOC 26. A sensor 31 is provided, a second exhaust temperature sensor 32 that flows into the DPF 27 is provided between the DOC 26 and the DPF 27, and a differential pressure sensor 33 that detects the differential pressure of the exhaust gas before and after the DPF 27 is provided.

  The detection values of these sensors 30 to 33 are input to an ECU (engine control unit) 35 that controls the engine 10, and based on the detection values of the sensors 30 to 33, the ECU 35 performs the intake throttle valve 19, the EGR valve 23, the variable blade turbo. The charger 15 and the exhaust brake valve 25 are controlled. Further, the ECU 35 controls the fuel injection amount and the injection timing of each fuel injection valve 20 based on the depression amount of the vehicle accelerator pedal 43.

  The engine 10 is connected to a transmission 36 that transmits power to the drive system. The transmission 36 is provided with a PTO shaft 37 that extracts the power of the engine 10, and a PTO device 40 such as a body pump is connected to the PTO shaft 37. The PTO device 40 can be controlled by the lever 42 of the PTO accelerator 41.

  When the PTO device 40 is driven, the ECU 35 controls the engine 10 based on the operation amount of the lever 42 of the PTO accelerator 41 by turning the PTO switch 44 ON / OFF.

  In the present invention, the ECU 35 obtains the PM accumulation amount in the DPF 27 based on the detection value of the differential pressure sensor 33, and when the accumulation amount exceeds the set value, the exhaust gas temperature is raised and the DPF is automatically regenerated. Let In this case, normal automatic regeneration is performed when the vehicle is traveling, and PTO automatic regeneration is controlled when the PTO device 40 is being driven, and the PTO is turned ON / OFF during any regeneration. When is switched, normal automatic reproduction and PTO automatic reproduction can be automatically switched.

  This will be described below. The ECU 35 includes a PTO detection means 50, a normal automatic regeneration means 51, a PTO automatic regeneration means 52, a normal / PTO regeneration progress map 53, an idle increase means 54 during PTO automatic regeneration, and an idle increase. A limiting means 55, a PTO accelerator exhaust control means 56, and a PTO automatic regeneration interruption means 57 are provided.

  The PTO detection means 50 detects whether the PTO switch 44 is ON or OFF, and detects the operation amount of the lever 42 of the PTO accelerator 41 during PTO.

  The normal automatic regeneration means 51 controls the fuel injection valve 20 to perform multi-injection of the fuel when the vehicle with the PTO device is in a normal travel, and raises the exhaust gas temperature to be higher than the catalyst activation temperature. Thereafter, post injection or exhaust pipe injection (not shown) is performed by an exhaust pipe injector, the exhaust gas temperature is 600 ° C. or higher, and a predetermined regeneration time is maintained, so that PM deposited on the DPF 27 is burned and removed.

  The PTO automatic regeneration means 52 raises the exhaust gas to the catalyst activation temperature or higher when there is a regeneration request during PTO, and then changes the exhaust gas temperature by post injection or exhaust pipe injection to the exhaust gas temperature during normal automatic regeneration (600 ° C). While maintaining the lower predetermined range, the DPF 27 is automatically PTO played over a longer time than the normal automatic playback time.

  The normal / PTO regeneration progress map 53 stores a regeneration control line in which the exhaust gas temperature with respect to the time from the start to the end of the DPF regeneration is stored during normal automatic DPF regeneration and PTO automatic regeneration. When the PTO is switched from ON to OFF or from OFF to ON, switching from normal PTO automatic playback to normal automatic playback or normal automatic playback to PTO automatic playback and the playback progress at the time of switching to the normal automatic playback means 51 or PTO The normal automatic reproduction means 51 or the PTO automatic reproduction means 52 outputs to the automatic reproduction means 52 and controls the remaining automatic reproduction from the reproduction progress status at the time of switching to the end of reproduction.

  The normal automatic reproduction means 51, PTO automatic reproduction means 52, and normal / PTO reproduction progress map 53 will be described with reference to FIG.

  FIG. 2 shows the relationship between exhaust gas temperatures in normal automatic regeneration and PTO automatic regeneration from the start of regeneration to the end of regeneration when a regeneration request is made. The normal / PTO regeneration progress map 53 shows the normal automatic regeneration A normal reproduction control line Rr and a PTO reproduction control line Rp during PTO automatic reproduction are stored.

  Normal automatic reproduction by the normal automatic reproduction means 51 is performed based on the normal reproduction control line Rr. That is, when there is a regeneration request, normal exhaust regeneration is performed in which the exhaust gas temperature is raised to 600 ° C. after raising the exhaust gas temperature by multi-injection and post-injection based on the normal regeneration control line Rr, and the PM in the DPF 27 is increased. When there is no more unburned residue, normal automatic regeneration ends.

  The PTO automatic regeneration by the PTO automatic regeneration means 52 is performed based on the PTO regeneration control line Rp. That is, when there is a regeneration request during the PTO, the exhaust gas temperature is raised by multi-injection and post-injection based on the PTO regeneration control line Rp, and after a predetermined time has elapsed, PTO automatic regeneration is performed while maintaining the exhaust gas temperature. , PTO automatic playback is terminated.

  In the normal / PTO playback progress map 53, the normal playback control line Rr and the PTO playback control line Rp are stored in association with the progress rate from the playback start to the playback end. For example, the normal automatic playback is the normal playback control line. When switching to PTO automatic reproduction at 40% based on Rr, PTO automatic reproduction is performed as a reproduction time at which the PTO automatic reproduction progress rate is 40% so that the progress rate of the PTO reproduction control line Rp is 40%.

  Conversely, when the PTO automatic regeneration is switched to normal regeneration at a progress rate of 78%, the temperature is raised to the exhaust gas temperature corresponding to the progress rate of 78% of the normal regeneration control line Rr, and until the regeneration is completed, Normal reproduction is performed based on the reproduction control line Rr.

  Next, the PTO automatic regeneration idle up means 54, idle up restriction means 55, PTO accelerator exhaust control means 56, and PTO automatic regeneration interruption means 57 in FIG. 1 will be described.

  The PTO automatic regeneration idle-up means 54 detects whether the engine is idling when the PTO device 40 is ON and the PTO automatic regeneration means 52 starts PTO automatic regeneration. The engine speed is controlled so that the engine is gradually raised to idle up. The increase speed of the idle rotation speed during PTO automatic regeneration is set to be smaller than the increase speed of the idle rotation speed during normal automatic regeneration.

  The idle-up limiting means 55 regulates the upper limit value of the idle speed that is idled up by the idle-up means 54 during PTO automatic regeneration. The idle-up limiting means 55 adjusts the fuel injection amount based on the atmospheric pressure value during normal driving and controls the air-fuel ratio, and similarly controls the upper limit value at the idling speed, thereby automatically regenerating PTO. The exhaust gas temperature discharged after DPF regeneration at the time is prevented from excessively rising, and the exhaust gas temperature from the engine 10 is adjusted based on the detected value of the first exhaust gas temperature sensor 31 to adjust the fuel injection amount. The automatic regeneration idle-up means 54 limits the number of revolutions to be idled up. If the PTO device 40 has a limited drive rotational speed, the PTO automatic regeneration idle-up means is based on the limited drive rotational speed. At 54, the number of revolutions idled up is limited.

  The PTO accelerator exhaust control means 56 continues the PTO automatic regeneration by opening the exhaust brake valve 25 and opening the exhaust brake valve 25 when the fuel injection amount and the engine speed are not less than the set values and the PTO device 40 is driven. When the rotational speed based on the fuel injection amount is in the idle rotational speed region, the exhaust brake valve 25 is closed to prevent the PTO automatic regeneration temperature from being lowered, but the engine rotational speed is set. When the value rises above the value, the exhaust brake valve 25 is opened and the exhaust brake valve 25 is released. At this time, in order to prevent the engine brake speed from fluctuating around the set value and the exhaust brake valve 25 from frequently opening and closing, the exhaust brake valve 25 is opened at the first predetermined engine speed. After that, the opening and closing of the exhaust brake valve 25 is controlled by providing a hysteresis so that the exhaust brake valve 25 is closed when the engine speed decreases to a second predetermined engine speed lower than the first predetermined engine speed.

  The PTO automatic regeneration interruption means 57 performs the PTO automatic regeneration in which the fuel injection amount and the engine speed are equal to or less than the set values, the PTO device 40 is not driven, and the exhaust gas temperature is equal to or greater than the set time as determined in step S16. The PTO automatic reproduction is interrupted at the following times.

  Also, in FIG. 1, in the vicinity of the PTO accelerator 41 of the PTO device 40, a deposition display device 60 capable of recognizing the accumulated amount of DPF so that the operator can visually check and a regeneration display device 61 capable of recognizing PTO automatic regeneration are arranged. The accumulation display device 60 and the regenerative display device 61 can be recognized by lighting or the like with a signal from the ECU 35.

  The accumulation display device 60 has the same function as the accumulation display provided on the instrument panel in the conventional operating room. For example, the accumulation display device 60 can display the PM accumulation amount for each color in five stages. It blinks from 5 minutes before the playback request, lights up during PTO automatic playback, and turns off after playback ends.

  Next, the flow of the DPF regeneration system for a vehicle with a PTO device of the present invention described above will be described with reference to FIG.

  When a reproduction request is made in step S1, it is determined in step S2 whether or not the PTO is ON. When the PTO is OFF (No), normal automatic reproduction is performed in step S3. During this normal automatic reproduction, it is determined whether or not the PTO is ON in step S4. When the PTO is OFF (No), it is determined whether or not the normal automatic reproduction has elapsed for a predetermined time in step S5, and the predetermined time has elapsed. If not (No), the process returns to Step S3 and the normal automatic regeneration is continued. If the predetermined time has elapsed (Yes), the normal automatic regeneration is terminated and the normal running of Step S6 is performed.

  When the PTO is ON in Step S2 and Step S4 (Yes), PTO automatic reproduction is performed in Step S7.

  During this PTO automatic regeneration, it is determined whether or not the engine speed is idling at step S8. When the engine speed is equal to or higher than the idling speed, it is determined whether or not PTO is off at step S9 and PTO is off. (Yes) is returned to the normal automatic regeneration in step S3, and if it is during PTO (No) in step S9, it is determined whether or not the predetermined time has elapsed in step S10, and the predetermined time has elapsed. If not (No), the process returns to Step S7 and PTO automatic reproduction is continued, and if a predetermined time has elapsed (Yes), PTO automatic reproduction is terminated and Step S11 is set as normal PTO.

  Next, when the engine speed is idling in step S8 (Yes), in step S12, the engine speed is rushed to idle-up during PTO automatic regeneration, and in step S13, idling up from the exhaust gas temperature from the engine, etc. Limit the number of rotations. In step S14, it is determined whether the injection at the limited idling speed and the engine speed are equal to or greater than the set value. If the engine speed is equal to or greater than the set value, PTO automatic regeneration is enabled and the process returns to step S9.

  Further, when the injection at the limited idle speed and the engine speed are lower than the set value in step S14 (No), whether the operation amount of the PTO accelerator is 0 or more (operated during PTO) in step S15. If it is determined that the PTO is in progress, the PTO automatic reproduction is made possible and the process returns to step S9.

  In step S14 and step S15, since the engine speed is changed from idling to idling up and idling is restricted in steps S12 and S13, the PTO accelerator exhaust control means 56 returns to step S9 and performs PTO automatic regeneration. In this case, the exhaust brake valve is opened from a state in which it is closed during idling.

  Next, when the operation amount of the PTO accelerator is not equal to or greater than 0 in step S15 (No), it is determined in step S16 whether the exhaust gas temperature is equal to or lower than the set value and continues for a predetermined time t. Yes) In step S17, the PTO automatic regeneration idle-up escape is performed, and in step S18, the standby state (non-reproduction) is set. In step S19, it is determined whether the operation amount of the PTO accelerator is 0 or more. If no (No) is made, the process returns to step S18 to enter a standby state. In this standby state, the PTO automatic reproduction interruption means 57 holds the PTO automatic reproduction in the interruption state.

  During the interruption of the PTO automatic reproduction, if there is an operation amount of the PTO accelerator in Step S19 (Yes), the process returns to Step S8 to return to the PTO automatic reproduction flow.

  In step S16, when the exhaust gas temperature exceeds the set value within a predetermined time t, it is determined in step S20 whether the PTO is OFF. If it is ON (No), the idle up limit is returned to step S13. If the PTO is OFF (Yes), in step S21, the PTO automatic regeneration idle-up is escaped and the normal automatic regeneration is returned to step S3.

  As described above, according to the present invention, in addition to normal automatic regeneration in a vehicle with a PTO device, it is possible to automatically regenerate the DPF during PTO and to prevent thermal damage due to exhaust gas during regeneration.

10 Engine 25 Exhaust brake 27 DPF
35 ECU
37 PTO axis 40 PTO device 50 PTO detection means 51 Normal automatic reproduction means 52 PTO automatic reproduction means 53 Normal / PTO reproduction progress map

Claims (6)

A DPF regeneration system for a vehicle with a PTO (power take-off) device and a vehicle with a PTO device for automatically regenerating the DPF,
PTO detection means for detecting whether the PTO device is being driven;
A normal automatic regeneration means for performing normal DPF automatic regeneration when the PTO is OFF in the PTO detection means;
A PTO automatic regeneration means for maintaining the exhaust gas temperature flowing into the DPF lower than the exhaust gas temperature during normal DPF regeneration and regenerating the DPF over a regeneration time longer than the normal DPF automatic regeneration time when the PTO is ON by the PTO detection means A DPF regeneration system for a vehicle with a PTO device.   A normal / PTO regeneration progress map storing a regeneration control line in which an exhaust gas temperature with respect to a time from the start to the end of DPF regeneration is stored during the normal automatic DPF regeneration and the PTO automatic regeneration; When the PTO is switched from ON to OFF or from OFF to ON by the PTO detection means, switching from the PTO automatic playback to the normal automatic playback, or from the normal automatic playback to the PTO automatic playback, and at the time of switching And the normal automatic playback means or the PTO automatic playback means controls the remaining automatic playback from the playback progress status at the time of switching to the end of playback. Item 4. A DPF regeneration system for a vehicle with a PTO device according to Item 1.   When PTO automatic regeneration is started by the PTO automatic regeneration means when the PTO device is ON, it is detected whether or not the engine is idling, and when idling, PTO automatic regeneration is performed to gradually increase the idling speed. Idle-up limiting means that includes an idle-up means and limits the number of revolutions to be idled up by the idle-up means during the PTO automatic regeneration based on the exhaust gas temperature from the engine or based on the limited drive rotational speed of the PTO device A DPF regeneration system for a vehicle with a PTO device according to claim 1.   The PTO automatic regeneration includes PTO accelerator exhaust control means for opening the exhaust brake valve and continuing the PTO automatic regeneration when the fuel injection amount and the engine speed are equal to or greater than the set values and the PTO device is driven. The DPF regeneration system for a vehicle with a PTO device according to claim 3.   In the PTO automatic regeneration, PTO automatic regeneration interruption means for interrupting PTO automatic regeneration when the fuel injection amount and the engine speed are equal to or higher than the set values, the PTO device is not driven, and the set time and the exhaust gas temperature are equal to or lower than the set values. A DPF regeneration system for a vehicle with a PTO device according to claim 3.   2. The DPF regeneration system for a vehicle with a PTO device according to claim 1, wherein a deposition display device capable of recognizing a deposition amount of DPF and a regeneration display device capable of recognizing PTO automatic regeneration are disposed on a PTO accelerator of the PTO device.

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