JPS5990713A - Fine particles purification device in diesel engine - Google Patents

Abstract

PURPOSE:To prevent rapid variation in the brightness of a heat lamp by a method wherein when an electric heater is heated in case of reproducing purification device, a plurality of resistance lines are energized one by one in a step- wise manner and the main body of electric heater is energized simultaneously with a termination of energization of electricity. CONSTITUTION:In case that a collector material 8 of trap 2 arranged in a deaerator passage 1 is reproduced, a reproducing time is judged by ECU 13 and a bypass valve 4 is opened with VSVs 6, 7 and at the same time a relay 12 is turned on and an electric heater 9 is energized. In this case, the electric heater 9 is composed of a plaurlity of main bodies of electric heater 14 and a plurality of resistor lines 15. When the electric heaters 9 are energized, at first a plurality of resistor lines 15 are energized one by one in a stepwise manner, and lastly the energization of the resistance line 15 is terminated and at the same time the main body of the electric heater 14 is energized. Thereby, a consumption power of a battery 11 is varied in a stepwise manner to prevent a rapid variation in the brightness of the head lamp with a power supply of the battery 11.

Description

[Detailed Description of the Invention] This invention is based on the purification of particulates in Diegel engines. 1
+3 to! This is related to the electric heater installed in the particulate purification device.

The exhaust gas emitted from the diesel engine is passed through a trap installed in the bleed passage of A, and is contained in the gas. is collected by a collection material made of a ceramic porous body that constitutes laps 1 to 1. As time passes, particulate matter 1. accumulates in the l-lap, increasing pressure loss and increasing engine output loss, so before particulate matter 1. accumulates to some extent and affects output Then, incinerate and remove particulate 1.
~ It is necessary to play the rap.

This regeneration can be carried out either by placing an electric heater on the upstream end of the collection material and using the electric heater to directly ignite the particulate matter 1 and burning it, or by squeezing the particulate matter 1 and passing it through the collection material. This is done by increasing the temperature of the overlying gas to a temperature higher than the combustion temperature of particulate matter, and then burning the heated l31 gas. The same battery as the power source is used, and if you turn the electric heater on and off while the headlamp is on, the brightness of the headlamp will change momentarily at the moment it turns on and off.However, when you turn on the electric heater, As shown in Figure 1, a voltage drop occurs in the battery voltage.This voltage drop occurs instantaneously when the electric heater is energized, so the change in headlamp brightness caused by the voltage drop is slightly visible. Become a place where you can.

The purpose of the present invention is to make it impossible to visually recognize the instantaneous change in the brightness of the headlamp caused by the A/A switch of the electric heater in the headlamp point pair.
For this purpose, the present invention provides a structure for a particulate purification device for a diesel engine, particularly an electric heater.

In order to achieve this objective, in the diesel engine particulate purification device of the present invention, the electric heater consists of the electric heater body and a plurality of newly installed resistance wires. The energization sequence is such that first, the plurality of resistance wires are energized step by step, and finally the electric heater body is energized.

The electric heater body is divided into multiple parts due to the restriction of the dispersion capacity, and while only one electric heater body is energized, the electric heater body is energized in turn to ignite and burn the particulates downstream. ing. If multiple resistance wires are provided separately in addition to the electric heater main body, which is made up of multiple wires, the power consumption of each resistance wire is equal to the power consumption of each resistance wire when there are N resistance wires and When the power consumption is W, it is set to W/(N+1). For multiple resistance wires, the first wood is energized first, then the second wood is energized while the first wood is energized, and then the third wood is energized while the first and second wood are energized. energize in stages, and finally energize all N resistance wires. “After that, power is applied to one of the backs of the electric heater body, and at the same time the power to the N resistance wires is cut off.After that, the power is applied to the multiple electric heater bodies one by one in turn.

At this time, electricity is not supplied to any of the plurality of electric heater bodies other than the one that is energized. In this way, the electric heaters are energized one by one in order, and all the electric heater bodies are energized one at a time, thereby completing the energization of the electric heater bodies. The power to the electric heater body that was last energized is cut off.4
At the same time, all of the resistance wires are energized. Even if the current to the resistance wire is cut off one by one after 0, the last 1
The current to the wooden resistance wire is cut off, completing the cutting of the current. .

In an electric heater configured in such an energization order, the power consumption when the electric heater is turned on and off varies stepwise, and accordingly, the battery voltage also changes stepwise in small steps when the electric heater is turned off. This change is smaller than the conventional case where the electric heater is energized all at once and directly, and changes smoothly in stages, making it difficult to see, and even when the headlights are on, the brightness of the headlights changes You won't be able to feel any instantaneous changes.

Hereinafter, preferred embodiments of the particulate purification device for a deep-pil engine according to the present invention will be explained with reference to the drawings.

Figure 2 shows fine particles of the diesel engine according to the present invention)
1 shows a system of an embodiment of the conversion device.

In the figure, 1 is an exhaust passage of a diesel engine, and 2 is a trap for collecting particulates in the exhaust gas. A bypass passage 3 is provided in the trap 2, and a bypass valve 4 is disposed in the bypass passage 3. The bypass valve 4 is opened and closed by the diaphragm 5.
The operation of the diaphragm 5 is performed by VSV6.7. One VSV6 leads to vacuum pump, the other VSV7 leads to popularity. Yuzu collected wood 8 is charged into laps 1 and 2, and an electric heater 9 for igniting the particulates 1 is provided upstream thereof.

Further, the trap 2 is provided with a temperature detection sensor 10,
For example, incoming gas is detected. The electric heater 9 is body grounded, and the electric circuit of the electric heater 9 includes a battery 1'! A relay 12 is provided to turn on and off the supply of electricity to the electric heater 9. Playback is done on computer 13 (E
CU). When the ECU 13 determines that the regeneration time has come, the bypass valve 4 switches to VS.
By activating V6.7, the relay 12 is turned on and the electric heater 9 is energized, and after A, the flow rate of exhaust gas flowing through laps 1 and 2 is controlled by opening and closing the bypass valve 4, and regeneration is performed. . The second computer 13 controls this (top right).

The above electric heater 9 is shown in FIG.
has been completed. That is, the electric heater 9 has a plurality of (8 pieces in the figure) electric heater bodies 14 and electric heater bodies 1/I.
There are multiple resistance wires (15 in the figure) arranged separately from the
It consists of If each electric heater main body 14 traces 50
For 0W, each JIX resistance line 15 is set for 100W. The order of energization is that first, the resistance wire 15 is energized in stages, and after the 4th metal part is energized, the energization of the 4th resistance wire 15 is cut off, and at the same time, the electric heater main body 14 of the 1st hole L1 is energized. be done. Next, the electric heater water body 14
are energized one by one. When all the electric heater bodies 14 have been energized once, the electric heater body 14 that was energized last is turned off, and at the same time, the resistance wire 15 of the fourth water metal part is energized. Subsequently, the power supply to the resistance wires 15 is cut off one by one, and when the power supply to all the resistance wires 15 is cut off, the power supply to the electric heater 9 is terminated. This order of energization is controlled by the ECU 13 and activated by the relay 12.

Next, the effect of J3L on the negative protection created by li4 as described above will be explained.

In FIG. 2, the bypass valve 4 is normally closed and the exhaust gas flows through laps 1 to 2. The particulate matter 1 in the exhaust gas is collected by the ura collection material 8, and the exhaust gas with the particulate matter i~ purified is discharged into the atmosphere. When the cumulative number of engine revolutions exceeds a certain number of revolutions, for example 200,000 revolutions, the ECU 13 determines that it is time for regeneration, and the bypass valve 4 listens. Subsequently, the electric heater 9 is energized by the relay 12 . At this time, since the power supply order is controlled as described above, the change in power consumption is as shown in FIG. 4. However, since the resistance wires 15 are energized one by one, the power consumption of the battery 11 changes step by step. Then, when power to the electric heater main body 14 is started, only one heater at a time is energized, so the power consumption is constant.
Fru. Conversely, when disconnecting, the power consumption is reduced step by step. In response to such changes in power consumption, the voltage of the battery 11 changes step by step as shown in FIG.

In other words, as shown in FIG. 5 ("the battery voltage decreases step by step 1Φ as the resistance wire 15 is energized, it remains almost constant while the electric heater body '14 is energized, and when the energization is cut off (
Second, as the current to the resistance wire 15 is cut off one by one (the battery voltage increases step by step).

1, the battery voltage is as shown in Figure 1, lj
Since the change is gradual and gradual, the brightness of the headlamp that powers up the same battery 11 will gradually change slightly even in November, and this circle iV
You cannot feel the changes in the I-C congratulations compared to the changes that occur all at once.

As explained above, when using the particulate purification device for a diesel engine of the present invention, a plurality of resistance wires are provided in the 1U electric heater, and these are energized in order to energize the electric heater body, and the electric heater is turned off. On the contrary, with 'ft'1J', the power to the resistance wires is cut off in order, so it is possible to suppress sudden changes in the brightness of the headlights even when the headlights are on, which makes it practical. This has the effect of eliminating perceptible changes in headlamp brightness.

[Brief explanation of the drawing]

FIG. 1 is a battery voltage characteristic diagram of a conventional diesel engine particulate purification device, FIG. 2 is an overall system diagram of a diesel engine particulate purification device according to an embodiment of the present invention, and FIG. 2 is a front view of the electric heater of the particulate purification device V1, FIG. 4 is a power consumption characteristic diagram of the electric heater of FIG. 3 in the energization order of the present invention, and FIG. This is the battery voltage characteristic diagram. 2......1-Wrap 4...Bypass pulp 8...Collection shrine 9...Electric heater 1'1・・・・・・・・・Disconnection 12・・・・・・Relay 133・・・・・・ECU 14・・・・・・Electrical controller 9 body 15...
...Resistance line Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (g) 1- installed in the exhaust passage of a diesel engine ()
An electric heater consisting of an electric heater body and a plurality of resistance wires is provided on the wrap, and the electric heater body d3J: and the plurality of resistance wires are sequentially energized one by one. A particulate purification device for a diesel engine, characterized in that the particulate purification device for a diesel engine is configured to energize the main body of the electric heater at the same time as energizing the resistance wire and finally stopping the energizing to the resistance wire.