JPH0420975Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an engine exhaust purification device for preventing white smoke generated when starting an engine.

<Prior art> Generally, when an engine is started, white smoke may be generated in the exhaust gas at the time of starting. This white smoke is unburned or incompletely burned fuel, and such white smoke tends to occur more often when the engine temperature is low.

In order to prevent white smoke from forming in the exhaust gas during startup, diesel engines, for example, have had their compression ratios increased.
Increasing the compression ratio causes structural problems or increases noise. Measures have also been taken to increase the temperature at startup by heating the intake air, but this has not been sufficiently effective. Alternatively, attempts have been made to activate the exhaust brake installed in the exhaust pipe and apply a load to the engine, causing the temperature to rise quickly, but this is still insufficiently effective and does not ensure white smoke. cannot be prevented.

〓Purpose of the invention〓 The present invention was made in view of the above problems, and uses a retarder and a particulate trap to effectively prevent white smoke when starting an engine. It is an object of the present invention to provide an engine exhaust purification device as described above.

〓Structure of the invention〓 The present invention is a device for preventing white smoke in the exhaust gas generated when starting an engine, which uses a retarder consisting of a generator, a particulate trap that has resistance and generates heat when energized, and , a starting control device and a water temperature sensor for detecting the temperature of cooling water of the engine are provided, and the starting control device operates a retarder for a time corresponding to the water temperature detected by the water temperature sensor when starting the engine. When activated to apply a load to the engine, the generated output of this retarder is supplied to the particulate trap to generate heat, and when white smoke contained in exhaust gas passes through the particulate trap, This relates to an engine exhaust purification device characterized in that the exhaust gas is decomposed and removed, and the engine exhaust gas purification device is characterized in that the engine is decomposed and removed, and the engine is By warming up the engine quickly and burning hydrocarbons, which are the main component of white smoke generated in exhaust gas, in a particulate trap, white smoke is prevented when starting the engine. It was designed to do so.

〓Example〓 The present invention will be described below with reference to an illustrated example.
FIGS. 1 and 2 show an engine 1 equipped with a retarder according to this embodiment, and this engine 1 is comprised of, for example, a diesel engine for trucks. A flywheel housing 2 is provided on the rear side of the engine 1, and a flywheel 4 fixed to a crankshaft 3 is housed within the housing 2 (see FIG. 3). Further, a transmission 5 is disposed on the back side of the flywheel housing 2, and is configured to change the rotational speed of the engine 1 to an appropriate value and transmit it to the driving wheels via a propeller shaft 6.

Next, regarding the structure of the retarder provided in this engine 1, as shown in FIG. Inductor magnetic poles 7 are provided at pitches. The flywheel 4 provided with the inductor magnetic poles 7 constitutes a rotor of an inductor type generator, and this generator constitutes a retarder of an automobile.

Cases 8 are provided on the upper and lower sides of the housing 2, and a stator of an inductor type generator is housed within these cases 8. As shown in FIG. 4, this stator includes a plurality of pole cores 9 arranged in the circumferential direction of the flywheel 4. The lower end of the pole core 9 faces the inductor magnetic pole 7 via a small air gap, and
Its upper end is connected to the case 8 via the stator yoke 10.
is fixed to the cover plate. An armature coil 11 and a field coil 12 are wound around the pole core 9, respectively. It should be noted that the armature coil 11 is wound around two pole cores 9, while the field coil 12 is wound around each pole core 9, one at a time. and field coil 12
is connected to a battery 14 via a controller 13, as shown in FIGS. 1 and 2.

On the other hand, the armature coil 11 for extracting the output of the retarder made of this inductor type generator is
Exhaust pipe 1 connected to exhaust manifold 20
5 is connected to a particulate trap 16 attached to the particulate trap 16. Patty cure trap 16
As shown in FIG. 3, it has a substantially cylindrical shape, and has numerous small holes 17 formed in its axial direction. Furthermore, the particulate trap 16 is made of conductive ceramic, and is made of a material having a predetermined resistance value such that it generates heat when electricity is applied to the trap 16. Disc-shaped electrodes 18 are attached to both ends of the particulate trap 16, and terminals 19 are attached to the lower ends of these electrodes 18. Both ends of the trap are connected to a particulate trap 16.

On the other hand, a controller 13 connects the battery 14 and the field coil 12 of the inductor type generator.
is equipped with a relay switch 21 as shown in FIGS. 1 and 2, and this relay switch 21
is opened and closed by a relay coil 22. The relay coil 22 is connected to a drive circuit 23, and the drive circuit 23 is operated by a control signal from a microcomputer 24. A key switch 25 is connected to the input side of the microcomputer 24, and a water temperature sensor 26 for detecting the temperature of the cooling water of the engine 1 is also connected.

Next, the operation of the retarder for this automobile configured as described above will be explained. For example, when a car equipped with this retarder goes down a long slope,
Turn on the retarder switch (not shown) located in the driver's seat. Then, current flows from the battery 14 to the field coil 12 of this inductor type generator via the controller 13 shown in FIGS. 1 to 3, and the coil 12 is excited. As shown in FIG. 4, the field coil 12 magnetizes two pole cores 9 in opposite directions, and so that a pair of pole cores 9 around which a common armature coil 11 is wound have opposite polarities. magnetize. Therefore, at a certain moment a magnetic circuit 27 is formed as shown by the dotted line in FIG. On the other hand, when the flywheel 4 rotates and the inductor magnetic pole 7 moves by an angle corresponding to the pitch of the pole core 9, a magnetic circuit 28 as shown by the chain line in FIG. 4 is formed.

The magnetic fluxes passing through these magnetic circuits 27 and 28 both interlink with the armature coil 11, and the directions of the magnetic fluxes passing through the two magnetic circuits 27 and 28 are reversed. Therefore, due to this change in magnetic flux, an electromotive force is induced in the armature coil 11, and this inductor type generator generates electricity. This means that the engine 1 or the vehicle drives the flywheel 4, and the work done from the outside at this time is used as braking force. Therefore, the vehicle receives a braking force and is decelerated by the power generated by the inductor type generator.

When the retarder brakes the vehicle in this way, the generated output of the generator constituting the retarder is taken out by the armature coil 11, and the particulate tractor connected to the armature coil 11 is also The current will be applied to the power source 16. As mentioned above, the particulate filter 16 is made of ceramic that is conductive and has a predetermined resistance. Therefore, when the trap 16 is energized, it generates heat, and the trap 16 generates heat. The particulate trapped by the small holes 17 of 16 will be reburned.

According to the exhaust system connected to the retarder according to this embodiment, the particulate matter in the exhaust gas, that is, the particulate matter trapped by the particulate trap 16 attached to the exhaust pipe 15, passes through the retarder. Re-combustion can be performed by effectively utilizing the output of the constituent generator, thereby making it possible to reliably remove particulate particulate from the exhaust gas.

Furthermore, the particulate trap 16 according to this embodiment is also used to prevent white smoke from being contained in the exhaust gas of the engine 1 during startup. Generally, when the engine is started when its temperature is low, a large amount of white smoke is generated. This white smoke is mainly composed of hydrocarbons including acetaldehyde, and it is desirable that such white smoke be effectively and reliably reduced or removed.

Therefore, in the apparatus according to this embodiment, a retarder consisting of an inductor type generator and a particulate trap 1 are connected by the control operation of the microcomputer 24 based on the flowchart shown in FIG.
6 to prevent white smoke. That is, when the key switch 25 is closed and the engine is cranked, the microcomputer 24 detects that the engine is in the starting state, and upon this detection, performs the operation of the flowchart shown in FIG. Do this.

In this operation, first, the temperature of the cooling water of the engine 1 is detected by the water temperature sensor 26. Next, the microcomputer 24 reads a map of the relationship between water temperature and energization time stored in its memory. This map may be, for example, a map as shown in FIG. 6, or a map showing the energization time of the particulate trap 16 depending on the cooling water temperature. The microcomputer 24 then sets in its register the time for operating the particulate trap 16, based on the above water temperature and this map.

In this state, the microcomputer 24
supplies a control signal to the drive circuit 23 and closes the relay switch 21 via the relay coil 22. Therefore, a field current is caused to flow from the battery 14 to the field coil 12 of the inductor type generator.
The inductor type generator installed in the flywheel 4 of the engine 1 will generate electricity, which will add a load to the engine 1, and the fuel will be increased by the action of the governor of the fuel injection pump (not shown). Try increasing the amount. The microcomputer 24 then counts the time that the retarder is activated, and also determines whether this time has exceeded the time set in the above register. If the set time has been exceeded, a stop signal is sent. occurs. Then, this stop signal is sent to drive circuit 2.
3, and the relay coil 22 is deenergized.
Therefore, the relay switch 21 is opened again, the supply of field current is stopped, and the braking operation of the retarder is also stopped.

As described above, according to the device according to this embodiment, when the engine is operating, the retarder is operated for a certain period of time according to the water temperature detected by the water temperature sensor 26, and the power generation output of the retarder is The rate trap 16 is supplied with the rate trap 16. Therefore, by applying braking force to the engine 1 using the retarder, it becomes possible to shorten the warm-up time when starting the engine 1. Moreover, since the particulate trap 16 generates heat due to the power generation output generated by the retarder at this time, unburned hydrocarbons, that is, white smoke generated by the engine 1 at the time of startup, are transferred to the particulate trap 16. When passing through the small holes 17, the white smoke is combusted, and the white smoke is decomposed into water and carbon dioxide gas, which are then discharged. Therefore, from this,
It becomes possible to effectively prevent white smoke during startup.

Although the present invention has been described above with reference to an illustrated embodiment,
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, although the above embodiment relates to an exhaust gas purification device for a diesel engine, the present invention is also applicable to an exhaust gas purification device for a gasoline engine.

〓Effects of the invention〓 As described above, the present invention includes a retarder consisting of a generator, a particulate trap that has resistance and generates heat when energized, a starting control device, and detects the temperature of the engine cooling water. Equipped with a water temperature sensor,
When the engine is started, the retarder is operated by the start control device for a time corresponding to the water temperature detected by the water temperature sensor to apply a load to the engine, and the generated output of the retarder is sent to the particulate trap. The exhaust gas is supplied with heat to generate heat, and the white smoke contained in the exhaust gas is decomposed and removed when passing through the particulate trap. Therefore, according to the present invention, it is possible to accelerate warm-up by applying a load to the engine at the time of starting with the retarder for a time set according to the temperature of the engine's cooling water, and at the same time, the retarder generates electricity. The output allows the particulate trap to generate heat to combust white smoke, making it possible to remove white smoke from exhaust gas when starting the engine. Moreover, since the retarder applies a load to the engine and the particulate trap generates heat for a time set according to the engine cooling water temperature, the retarder required to warm up the engine and remove white smoke is is effectively driven for an appropriate amount of time.

[Brief explanation of drawings]

Fig. 1 is a side view of the main parts of an engine equipped with an exhaust gas purification device according to an embodiment of the present invention, Fig. 2 is a plan view of the main parts, and Fig. 3 is an external perspective view showing a retarder attached to this engine. Figure 4 is an enlarged vertical sectional view of the main parts of this retarder, Figure 5 is a flowchart showing the operation of this retarder to prevent white smoke, and Figure 6 is a graph showing the trap energization time with respect to cooling water temperature. . In addition, in the symbols used in the drawings, 1...engine, 4...flywheel, 7...inductor magnetic pole,
10... Stator yoke, 11... Armature coil,
12... Field coil, 15... Exhaust pipe, 16...
A particulate trap, 21...relay switch, 22...relay coil, 23...drive circuit, 24...microcomputer, 26...water temperature sensor.

Claims (1)

[Scope of utility model registration request] A device for preventing white smoke in exhaust gas generated when starting an engine, which includes a retarder consisting of a generator, a particulate trap that has resistance and generates heat when energized, a starting control device, and an engine cooling device. and a water temperature sensor for detecting water temperature, and when the engine is started, the retarder is operated by the start control device for a time corresponding to the water temperature detected by the water temperature sensor to apply a load to the engine. The power generation output of this retarder is supplied to the particulate trap to generate heat, so that the white smoke contained in the exhaust gas is decomposed and removed as it passes through the particulate trap. Features of the above engine exhaust system.