JPH077533Y2 - Particulate trap filter regeneration device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention collects particulate matter such as carbon particles (hereinafter referred to as "particulate") contained in the exhaust gas of a diesel engine and exhausts it. The present invention relates to a regenerating apparatus for a particulate trap filter that purifies gas.

[Conventional technology]

In general, the exhaust gas of a diesel engine contains particulates, and if it is released into the atmosphere as it is, there is a problem such as pollution of the atmosphere. The exhaust gas is purified by providing a filter for collecting the exhaust gas.

However, if you continue to collect the particulates, clogging will occur. If it becomes clogged, the pressure of the exhaust gas on the upstream side of the filter rises and becomes an operating resistance of the diesel engine, and if it remains as it is, the output of the diesel engine will decrease.

Therefore, from the viewpoint of preventing the output reduction of the diesel engine, a heating device for heating the exhaust gas is provided in the exhaust system, and the heated exhaust gas burns the particulates in the filter to regenerate the filter. Was there.

As such a particulate trap filter regeneration device, for example, the one shown in Japanese Utility Model Laid-Open No. 59-70018 or FIG. 4 is known.

In the device shown in FIG. 4, a filter b for collecting particulates is provided in an exhaust pipe a provided with an exhaust brake j on the upstream side, and a filter b is collected on the upstream side of this filter b. A burner device c for burning the particulate matter is provided. In the burner device c, the ignition timing (by the glow plug d), the supplied fuel amount, etc. are controlled by a command from the control circuit e. On the input side of the control circuit e, an exhaust pressure detector f for sending a signal for judging regeneration of the filter b, an exhaust temperature detector g for sending a signal for judging ignition of the burner device c, and a burner A diesel engine speed detector h and a diesel engine load detector i, which send a signal for determining the amount of fuel supplied to the device c, are connected.

The control circuit e controls the operation of the burner device c based on the detection signals from the exhaust pressure detector f, the exhaust temperature detector g, the engine speed detector h and the engine load detector i. According to a command from the circuit e, the particulate is burned according to the operating state of the engine to regenerate the filter.

[Problems to be solved by the device]

However, in the regeneration device for the particulate trap filter of the vehicle such as the truck having the exhaust brake as described above, when the exhaust gas temperature is raised by the burner device c during the operation of the exhaust brake j, the filter b is regenerated. There is a possibility that a white smoke may be generated due to a misfire of the burner device c and a filter b may be damaged due to excessive temperature rise due to a rapid change in the exhaust gas flow rate due to the operation of the exhaust brake.

Even in a device using a heater instead of the burner device c, the same problem as the above device may occur.

The present invention has been made in view of the above, and an object thereof is to prevent generation of white smoke due to misfire of a burner caused by performing filter regeneration during operation of an exhaust brake, and to prevent filter damage due to excessive temperature rise of the filter. It is an object of the present invention to provide a regenerating apparatus for a particulate trap filter that prevents the above.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an exhaust pipe equipped with an exhaust brake upstream of which a filter for collecting particulates is provided, and heating for burning the particulates collected upstream of the filter. In a regeneration device of a particulate trap filter provided with a device, the heating device is controlled by detection outputs of an operating state sensor group that detects an operating state of an engine and an exhaust brake operating sensor that detects an operating state of an exhaust brake. Then, a control device for delaying the execution of the regeneration process until the operation of the exhaust brake is released is provided.

[Action]

When it is judged that the filter regeneration process is necessary, the output of the operating condition sensor group and the exhaust brake activation sensor is monitored to detect the presence or absence of the exhaust brake activation, and during the exhaust brake activation, the regeneration is delayed until the activation is released. .

Therefore, when the exhaust brake is operating, regeneration processing is not performed, and generation of white smoke due to burner misfire and damage to the filter due to excessive temperature rise of the filter are prevented.

〔Example〕

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

FIG. 1 shows the configuration of a preferred embodiment of the present invention. In the figure, a filter 12 for collecting particulates is arranged in the middle of the exhaust pipe 10. A heating device 14 that heats the exhaust gas introduced into the filter 12 according to a command is provided in the exhaust pipe 10 on the upstream side of the filter 12. The heating device 14 has a light oil burner 14a for generating a mixed gas of air and light oil and a glow plug 14b.
The light oil burner 14a is configured to be ignited by electric power from 14d. Further, the exhaust pipe further upstream of the heating device 14
An exhaust brake 16 is provided in the exhaust valve 10, and an exhaust brake operation sensor 18 that detects the operation of the exhaust brake 16 is provided.
Is provided.

A temperature sensor 20 for detecting the temperature of the exhaust gas and an exhaust pressure sensor 22 for detecting the exhaust pressure are arranged in the exhaust pipe 10 on the upstream side of the filter 12.

The detection outputs of the temperature sensor 20, the exhaust pressure sensor 22, and the exhaust brake actuation sensor 18 are supplied to a control unit 24 as a control device.

The control unit 24 is composed of a microcomputer having a CPU, ROM, RAM, etc., and takes in the detection outputs from the temperature sensor 20, the exhaust pressure sensor 22, the exhaust brake actuation sensor 18, the engine speed sensor 26, the engine load. The detection output of an operating state sensor that detects various operating states of the engine such as the sensor 28 is fetched, and the operations of the light oil burner 14a and the switch 14c are controlled based on the detection output of each sensor. The present embodiment has the above configuration, and its operation will be described below with reference to the flowchart of FIG.

The control unit 24 detects whether the key switch is on and determines whether the engine is stopped (step 10).
0). Then, when the engine is operating, it is determined whether or not the regeneration process of the filter 12 is necessary based on the detection outputs of the engine speed sensor 26, the engine load sensor 28, the temperature sensor 20, and the exhaust pressure sensor 22 (step 102). ). When the filter 12 does not need to be regenerated, the process returns to step 100, and when the filter needs to be regenerated, it is determined whether or not the exhaust brake 16 has operated based on the detection output of the exhaust brake operation sensor 18 (step 104).

When the exhaust brake 16 is not operating in step 104, the process proceeds to step 106, and the regeneration process of the filter 12 is executed. That is, the mixed gas is generated from the light oil burner 14a, the glow plug 14b is energized to ignite the mixed gas, and the exhaust gas introduced into the filter 12 is heated to a temperature at which the particulates burn.

On the other hand, when the exhaust brake 16 is operating, execution of the regeneration process is delayed until the operation of the exhaust brake 16 is released.

Then, after the operation of the exhaust brake 16 is released, the regeneration process of the filter 12 is executed.

When the exhaust brake 16 is operated during the regeneration process of the filter 12, the regeneration process of the filter 12 is stopped and the operation of the exhaust brake 16 is prioritized.

Thus, in the present embodiment, when the regeneration process of the filter 12 is executed, when the exhaust brake 16 is operating, the execution of the regeneration process of the filter 12 is delayed until the operation of the exhaust brake 16 is released. Because of the light oil burner
It is possible to prevent misfire of 14a to generate white smoke and damage to the filter 12 due to excessive temperature rise of the filter 12.

FIG. 3 shows the configuration of another embodiment of the present invention.

In the present embodiment, a heater 14e is provided as the heating device 14, and electric power from the battery 14d is supplied to the heater 14e via the switch 14c. Other configurations are the same as those in FIG. Therefore, the same components are designated by the same reference numerals and the description thereof will be omitted.

Also in this embodiment, as in the case of the above embodiment, when the regeneration process of the filter 12 is executed, when the exhaust brake 16 is operating, the regeneration process of the filter 12 is executed, that is, the heater 14e.
Since the energization of the exhaust brake 16 is delayed until the operation of the exhaust brake 16 is released, it is possible to prevent the temperature of the exhaust gas introduced into the filter 12 and the heater 14e from rising sharply due to the operation of the exhaust brake 16. it can.

[Effect of device]

As described above, according to the present invention, even when the regeneration process of the filter is executed, the execution of the regeneration process is delayed until the exhaust brake is deactivated when the exhaust brake is operating. It is possible to prevent generation of white smoke and damage to the filter due to the operation of, and it is possible to obtain an excellent effect that it can contribute to cleaning of exhaust gas and improvement of reliability of the filter.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
A flow chart for explaining the operation of the device shown in the figure,
FIG. 3 is a block diagram showing another embodiment of the present invention, and FIG. 4 is a block diagram of a conventional device. 10 ... Exhaust pipe, 12 ... Filter, 14 ... Heating device, 18 ...
Exhaust brake activation sensor, 20 Temperature sensor, 22
Exhaust pressure sensor, 24 …… Control unit, 26 …… Engine speed sensor, 28 …… Engine load sensor.

Claims (1)

[Scope of utility model registration request] 1. A party provided with a filter for collecting particulates in an exhaust pipe provided with an exhaust brake upstream, and a heating device for burning the collected particulates upstream of the filter. In the regeneration device of the curate trap filter, the heating device is controlled by the detection output of the operation state sensor group that detects the operation state of the engine and the exhaust brake operation sensor that detects the operation state of the exhaust brake to operate the exhaust brake. A regeneration device for a particulate trap filter, comprising a control device for delaying the execution of the regeneration process until the release.