JPH0648097Y2 - Power supply circuit for exhaust gas aftertreatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is an exhaust gas post-treatment device that collects particulate matter in exhaust gas with a particulate trap and incinerates it with a heater for regeneration processing. The power supply circuit connected to.

(Prior Art) There is known an exhaust gas post-treatment device that captures particulates from the exhaust gas of a diesel engine and purifies the exhaust gas. This exhaust gas post-treatment device is constructed, for example, as shown in FIG.

The exhaust passage 2 of the diesel engine 1 communicates with the exhaust pipe 3, a sub-muffler 4 mounted in the middle of the exhaust pipe 3, a branch port of a bypass passage 6 extending from the exhaust passage 2 through a switching valve 5, and the exhaust pipe 3. Along with the air pump 7, the air exhaust path 2
It is composed of a confluent port of the air introducing pipe 8 introduced therein, a canning container 10 accommodating the particulate trap 9 on the downstream side of the air introducing pipe 8 and an exhaust port 11.

The switching valve 5 is an actuator 12 consisting of an air cylinder.
The actuator 12 is supplied with high-pressure air from an air tank (not shown) when the solenoid valve 13 is turned on, and the valve 5 is switched from the steady position P0 to the operating position P1. Similarly, the air introduction pipe 8 is provided with an opening / closing valve 14. This valve 14
Is operated by an actuator 15 composed of an air cylinder, and this actuator 15 is supplied with high-pressure air from an air source (not shown) when the solenoid valve 16 is turned on to close the valve 14.
Switch from P2 to open position P3.

An air permeable heat shield member 17 and a heater 18 are arranged in the canning container 10 on the rising side of the particulate trap 9. A battery 20 is connected to the heater 18 via a switch 19, and the battery 20 is charged by an alternator 21.

By the way, the above device includes a controller (not shown),
This controller detects the accumulated amount of particulates on the particulate trap 9 based on pressure information from a pressure sensor (not shown). When the amount exceeds a predetermined value, the solenoid valves 13 and 16 are operated to change the switching valve. 5 to operating position P
1, the on-off valve 14 is switched to the open position P3. Then, the switch 19 is turned on, the heater 18 is driven for a predetermined time, and at the same time, the air pump 7 is driven to incinerate the particulates on the particulate trap, and the particulate trap 9
Is being reproduced.

For such an apparatus, it has been proposed to adopt a configuration in which a heater 18 for heating particulates is supplied with a drive current for heating and ignition from a power source outside the vehicle.

In particular, each of the vehicle-side wirings of a plurality of vehicles can be individually connected to a plurality of joints on a single vehicle exterior reproduction unit via vehicle exterior wiring. In such a case, a single vehicle outside regeneration unit can be used to sequentially perform the regeneration processing of each particulate trap of a plurality of route buses entering the garage.

(Problems to be solved by the invention) However, even if each on-vehicle side wiring of a plurality of vehicles is connected to a plurality of joints on an exterior regeneration unit connected to an exterior power source, heaters are simultaneously connected to these joints. It is not possible to supply power for driving. That is, as shown in FIG. 2, the consumption current required for regeneration by the exhaust gas post-treatment device of each vehicle is the heater drive current I ₁ that is a large current and the pump drive current I ₂ that is a relatively small current. It becomes the total value of. Of these, the heater drive current I ₁ is a relatively short heater drive time T
p, the pump drive current I ₂ is supplied for a relatively long pump drive time Tb.

For this reason, it is often impossible to apply the heater driving current I ₁ that is a large current to a plurality of vehicles at the same time, because it exceeds the capacity of the vehicle outside power source.

Therefore, conventionally, electric power for regeneration processing is sequentially supplied to the exhaust gas post-treatment device of each vehicle at relatively long pump drive times Tb, and regeneration processing is sequentially performed.

Therefore, in the case of the conventional device, in order to regenerate the exhaust gas post-treatment devices for a plurality of vehicles, a regenerating process time of the number of vehicles that is the pump drive time Tb is required, and the regenerating process time can be shortened. It was desired to plan.

An object of the present invention is to provide a power supply circuit for an exhaust gas aftertreatment device which can relatively reduce the time required to regenerate all exhaust gas aftertreatment devices for a plurality of vehicles.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention captures particulates in the exhaust passage of an internal combustion engine with a particulate trap, and arranges the particulate trap at the inflow end of the particulate trap. It is connected to an exhaust gas post-treatment device that burns the particulates by a heater to perform a regeneration process, and is configured to supply a drive current to the heater from a power source outside the vehicle. It is connected to each heater of a plurality of vehicles through a control means, and the power distribution control means continuously supplies a driving current to each heater of the plurality of vehicles while shifting a predetermined heater driving time width. Is characterized by.

(Operation) The power distribution control means receives power from the power supply outside the vehicle, and can continuously supply the drive current to each heater of a plurality of vehicles connected thereto by deviating by a predetermined heater drive time width. .

(Embodiment) FIG. 1 shows an exhaust gas aftertreatment device and a vehicle exterior regeneration unit U which constitutes a main part of a power supply circuit for the device. The first
In the figure, a route bus enters the garage and the outside reproduction unit U
Is connected to the vehicle side.

The route buses here have a clear daily mileage,
Limited to a relatively short distance, and at night
It comes back to the garage.

As shown in FIG. 4, the exhaust passage 23 of the diesel engine 22 of such a bus communicates with the exhaust pipe 24 and the air introduction pipe 26 for introducing air from the air pump 25 into the exhaust passage 23. And an exhaust port 29 on the downstream side of the opening of the air introducing pipe 26. The canning container 28 accommodates the particulate trap 27 and the exhaust port 29.

Here, the merging port of the air introducing pipe 26 forms a merging portion with the exhaust passage 23, and the exhaust valve 30 operated by the normally open first solenoid valve 301 is arranged on the upstream side of the merging portion. A normally closed second solenoid valve 31 is provided in the middle of each pipe 26. Here, drive circuits 32 and 33 are connected to both solenoid valves 301 and 31, respectively. When both drive circuits 32 and 33 receive a switching command signal from the main switch 51, they output an ON signal for switching, and when the main switch 51 is pressed again, the output of both drive circuits 32 and 33 is switched off. Is configured.

Canning container containing the particulate trap 27
Reference numeral 28 is made of stainless steel, and is formed by a tubular portion 281 and trumpet-shaped connecting portions 282, 283 at the inflow end and the outflow end thereof. A particulate trap 27 made of a ceramic material having a honeycomb structure is housed in the center of the tubular portion 281, and an air permeable heat shield member 41 and a heater 42 are provided on the inflow end side thereof.
Is provided.

The capacity of the particulate trap 27 here is determined as follows. That is, even if the route bus travels a distance required for one day, the one having a trapping capacity of particulates that can be run during the period without the regeneration processing of the particulate trap is adopted.

The heat blocking member 41 is made by bending ceramic thin wires in a disordered state and stacking them together in a bulky state. The heat blocking member 41 has sufficient air permeability and, further, works so as not to let the heat of the heater escape to the connecting portion 282 side.

The heater 42 is formed of a bent ribbon-shaped heater wire, and its terminals are connected to the vehicle-side wiring 43, the heater switch 34, and the vehicle-side joint 44. Similarly, the motor 36 of the air pump 25 is connected to the vehicle-mounted joint 44 via the motor switch 35.

A heater timer 37 and a motor timer 38, which output an exciting current to the switches 34 and 35, are connected to the switches 34 and 35, respectively, and a timer operating means 39 that issues a set signal to the timers 37 and 38 is connected to the switches 34 and 35. The timer operating means 39 is composed of a voltage detector. That is, the in-vehicle joint
The voltage value at the 44th position is detected, and when it exceeds a set value, a set signal that is an ON output is output to each timer 37, 38.

The drive circuits 32, 33, both switches 34, 35, both timers 37, 3
8 is housed in a vehicle-mounted controller 40.

The vehicle-side joint 44 is configured to be connected to the vehicle-outside joint 45 at appropriate times.

As shown in FIG. 1, the vehicle exterior reproduction unit U is mounted on a carrier 50 here so that it can be freely moved to a proper position. As shown in FIG. 4, the exterior reproduction unit U has five cable connection terminals which are part of the base frame thereof.
55 is installed. Each terminal is connected to the vehicle-mounted joint 44 of each vehicle via a cable 56.

In addition, a cable is connected to the input terminal 57 of the exterior reproduction unit U.
An AC power supply (not shown) is connected via 53.

In the vehicle exterior reproduction unit U, a controller 46 as a power distribution control unit, a rectifier circuit 47 connected to the controller 46, a main switch 60, a current detector 61 for detecting a current value passing through the switch, Cable connection terminal 55 and input terminal 57
And switches 58, 59, 60, 61, and 62 arranged between and.

Further, each switch is connected to a controller 46 which gives an exciting current for turning on the switch.

The controller 46 includes a control unit 461, an input / output circuit 462 thereof, and a switch drive circuit 463.

Here, a control program as shown in FIG. 5 is written in the control unit 461 of the controller 46, and the operation of the apparatus will be described below according to this control program.

First, when multiple vehicles enter the garage and the engines are stopped respectively, the worker will see the on-board joint of each route bus.
The outer joints 45 at the ends of the cables 56 extending from the outer reproduction unit U are connected to 44. Then, the main switch 51 of each vehicle is turned on, the solenoid valves 301 and 31 of each vehicle are turned on, the exhaust passage 23 is closed, and the air introduction pipe 26 is opened. Then, the main switch 60 of the vehicle exterior reproduction unit U is turned on.

In this case, the control unit 461 of the controller outputs an output according to the aging pattern shown in FIG. 3 when the ON signal of the main switch 51 is input.

That is, when the main switch 51 is turned on, the controller first clears the terminal number N of the cable connection terminal 55 for supplying current.

Then, the N terminal current value is obtained based on the output of the current detector 61. Then, the current value is compared with the specified value Iα, and if the current value is less than or equal to the specified value Iα, the process proceeds to step a3, and if it exceeds, the process returns to step a2.

Here, the prescribed value Iα is set to be a required amount smaller than a value obtained by adding the heater driving current I _{1 of the first} vehicle and the pump driving current I ₂ as shown in FIG.

At step a3, 1 is added to the current terminal number N and N + 1 is rewritten to a new terminal number N. Then, the exciting current is output so as to turn on the switches 58 to 62 of the corresponding terminals of the terminal number N.

As a result, electric power is supplied to the vehicle connected to the terminal with the terminal number N.

Then, in step a5, it is determined whether or not the current terminal number N is smaller than the fifth terminal, and if YES, the process returns to step a2, and if the current terminal number N becomes the fifth terminal, the control ends.

By the way, in the first vehicle, the first step a4
Then, the timer operating means 39 is the heater timer 37 and the motor timer.
Both timers are set by issuing an ON output to 38. Then, the heater timer 37 turns on the heater switch 34 for the heater driving time Tp, and the pump timer 38 turns on the pump switch 35 for the pump driving time Tb, whereby both the air pump 25 and the heater 42 are driven. In this case, of the particulates on the particulate trap 27, the inflow end side is ignited by heating during 5 minutes (heater driving time Tp), and incineration is started.

In the first vehicle, after 5 minutes, the air pump
Only 25 is driven, and air is supplied to the particulate trap 27 side via the air introduction pipe 26. Then, after about 15 minutes have passed, the particulates on the particulate trap are sequentially incinerated from the inflow end side toward the outflow end side. Further, after about 15 minutes have passed, the air pump 25 is also cut off, and the regeneration processing of the entire area of the particulate trap 27 is completed.

Therefore, the output of the current detector 61 exceeds the specified value Iα during the heater driving time Tp, and the step
The determination of a2 is YES. When the heater driving time Tp elapses, the processes of steps a3 to a5 are performed, the terminal number N is incremented by 1, and the output current is supplied to the vehicle connected to the terminal side of the next terminal number N + 1.

As a result, the reproduction process for the second vehicle is performed in the same manner as for the first vehicle. In this case, the heater drive time Tp of the second vehicle overlaps with the pump drive time Tb of the first vehicle, but the total power consumption during that time is the outside regeneration unit U.
It is set to fit within the allowable power supply amount of the connected AC power source.

Similarly, after this, the regeneration process of each of the third, fourth, and fifth vehicles is subsequently performed, and the power consumption during this period is all within the allowable power supply amount of the AC power source to which the vehicle exterior regeneration unit U is connected. It is set to fit.

Then, after issuing the command output for the regeneration process of the fifth vehicle, the process proceeds to NO side in step a5, and the control is completed.

In this way, the device shown in FIG. 1 has a joint 45 for the vehicle that has returned to the garage when the route bus completes running for one day.
The vehicle exterior regeneration unit U is connected via the, and the main switch 51 of each vehicle and the main switch 60 of the vehicle exterior regeneration unit U are turned on, whereby the regeneration processing of each particulate trap of a plurality of vehicles can be easily continued. You can do it. In particular, the power supply circuit for this exhaust gas aftertreatment device
Heater drive time when regenerating multiple vehicles
One regeneration time Tt, which is the time of Tp multiplied by the number of vehicles and (Pump drive time Tb)-(Heater drive time Tp) added to this
And the playback processing time can be shortened than before.

Although the vehicle exterior regeneration unit U is connected to the AC power source in the above-mentioned place, the battery 62 may be used as a power source as shown in FIG. 6 instead.

With such a configuration, once the battery 62 on the carrier 50 is charged, the vehicle outside reproduction unit U can be moved regardless of the length of the cables 53 and 56, and the moving operability is improved. . In particular, when the vehicle cannot be moved near the AC power supply position, the vehicle exterior regeneration unit U can be easily transported and the particulate trap regeneration process can be easily performed.

(Effects of the Invention) As described above, according to the present invention, the power distribution control means can continuously supply the driving current to each heater of a plurality of vehicles by deviating the predetermined heater driving time width from each other. It is possible to complete the regeneration processing of a plurality of vehicles in a relatively short time without increasing excessively.

[Brief description of drawings]

FIG. 1 is a perspective schematic perspective view of a main part of a route bus equipped with a power supply circuit for an exhaust gas aftertreatment device according to an embodiment of the present invention, and FIG. FIG. 3 is a power characteristic diagram, FIG. 3 is a power consumption characteristic diagram of heaters and the like during regeneration processing of a plurality of vehicles performed by the same circuit, FIG. 4 is a block diagram of the power supply circuit of FIG. 1, and FIG. 1 is a flow chart of a power distribution control routine executed by the power supply circuit of FIG. 1, FIG. 6 is a schematic perspective view of a power supply circuit for an exhaust gas post-treatment device as another embodiment of the present invention, and FIG. 7 is a schematic view of a conventional device. is there. 22 …… Engine, 23 …… Exhaust passage, 27 …… Particulate trap, 28 …… Canning vessel, 42 …… Heater, 45
…… In-vehicle joint, 46 …… Controller, 53,56…
… Cable, U …… Reproduction unit outside the car.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Takeda 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (56) References Showa 63-19022 (JP, U) Actual public Flat 5-15528 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. An exhaust gas after a particulate trap in an exhaust passage of an internal combustion engine is captured by a particulate trap, and the particulate trap is incinerated by a heater provided at an inflow end of the particulate trap for regeneration treatment. In a power supply circuit for an exhaust gas post-treatment device, which is connected to a processing device and supplies a driving current to the heater from a power source outside the vehicle, the power source outside the vehicle is supplied to each heater of a plurality of vehicles through a distribution control means. A power supply circuit for an exhaust gas post-treatment device, characterized in that the power distribution control means is connected and continuously supplies a driving current to each heater of the plurality of vehicles by shifting a predetermined heater driving time width. .