JPH05187221A - Exhaust gas particulate purifying device - Google Patents

Abstract

PURPOSE:To prevent shortening of a battery life owing to the top of a vehicle during the regeneration of a filter and to prevent the occurrence of abnormal combustion in the regeneration of the filter when operation is executed again after a stop, in an exhaust gas particulate purifying device wherein the filter is regenerated through combustion of particulates, collected by a filter, for removable. CONSTITUTION:An exhaust gas particle purifying device comprises a filter 3 by which exhaust gas particulates are collected, a particulate igniting means 4 by which collected particulates are ignited for combustion when a collecting amount attains a given amount to regenerate the filter 3, and a control means 8 for controlling the particulate igniting means 4. Further, a display means 9 by which a particulate collecting state and a filter regenerating timing are displayed and a regeneration canceling means 10 by which the regeneration of a filter is canceled when a filter regeneration timing is approached and a stop after the starting of regeneration is scheduled are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust particulate purifying apparatus for collecting particulates contained in exhaust gas of a vehicle engine, particularly a diesel engine, and burning and removing the particulates.

[0002]

2. Description of the Related Art As a purifying device of this type, a filter is installed in the middle of an exhaust pipe of an engine to collect fine particles containing carbon as a main component in exhaust gas, and a predetermined amount of fine particles is collected in the filter. When the particulate matter is ignited, the particulate matter igniting means such as an electric heater or burner for igniting and removing the particulate matter and the control means with a built-in microcomputer for controlling the operation of the particulate matter igniting means are provided, and the particulate collection and the filter regeneration are performed in a predetermined manner. There is an exhaust particulate purifying device that automatically performs at timing (for example, Japanese Patent Laid-Open No. 1-170706).

[0003]

By the way, in this particulate purifying apparatus, when the vehicle is stopped immediately after the filter regeneration is started, the following problems occur. That is,
(1) The electric heater and the like have a relatively larger capacity than other auxiliary machines and lamps, and shorten the battery life if the exhausted battery is stopped without being charged. (2) If the filter regeneration is interrupted midway, the particles on the ignition means side of the filter are burned and removed, and the particles remain only on the downstream side of combustion. For this reason, when the vehicle is restarted, the regeneration cannot be immediately started and the collection is continued, but the fine particles remaining in a part of the filter deteriorate the balance of the accumulation of the fine particles, and abnormal combustion may occur during the regeneration. is there. (3) It is unsafe for the vehicle to be left in the garage during the filter regeneration.

Therefore, the present invention has been made to solve the above problems by providing an exhaust particulate purifying device capable of shifting the filter regeneration timing from the vehicle stop timing.

[0005]

According to the present invention, as shown in FIG. 1 (system diagram of the apparatus), a filter 3 provided in the middle of a vehicle exhaust pipe 2 and a particulate collection amount of the filter 3 reach a predetermined amount. In the exhaust particulate purifying device provided with the particulate ignition means 4 for igniting and burning and removing the collected particulates and the control means 8 for controlling the particulate ignition means 4, the lamp is turned on for the particulate collection and regeneration conditions of the filter 3. And the like, and the reproduction canceling means 10 for sending a cancel signal for canceling the next filter reproduction to the control means 8 by operating a cancel button or the like.

[0006]

When the driver tries to stop the vehicle, the driver cancels the filter regeneration by the regeneration canceling means when the time when the filter regeneration start time is approaching, as seen from the display on the display means. The canceled filter regeneration is performed the next time the vehicle is driven.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a filter 3 is installed in the middle of an exhaust pipe 2 of an engine 1. The filter 3 is a honeycomb structure made of a heat-resistant ceramic and has a large number of through holes arranged side by side. Every upstream opening of the through holes is closed, and at the downstream side, the upstream opening is closed. There is. An electric heater 4 is provided at the downstream end of the filter 3. The exhaust pipe 2 is provided with a bypass pipe 20 that branches from this and bypasses the filter installation portion, and switching valves 5a and 5b are provided at the branch points, respectively. An air pump 7 is provided on the exhaust pipe 2 downstream of the filter 3. Further, the exhaust pipe 2 is provided with a differential pressure gauge 6 for detecting a differential pressure across the filter 3.

Reference numeral 8 denotes an electronic control section which is a control means equipped with a microcomputer, and receives the signal from the differential pressure gauge 6 to control the electric heater 4, the switching valves 5a and 5b, the air pump 7 and a display means 9 which will be described later. ing.

In the passenger compartment, there is provided an indicator lamp 9 as a display means for displaying the particulate collection state in the filter 3, the filter regeneration timing and the regeneration state in response to a signal from the electronic control section 8. Further, a cancel button 10 for sending a cancel signal for canceling the next reproduction to the control means 8 at appropriate times is provided in the vehicle compartment.

FIG. 3 shows the indicator lamp 9 and its operation. Five kinds of lamps 9a, 9b, 9c and 9 are shown.
d and 9e. The lamps 9a to 9c (collection status indicator lamps) are 25%, respectively, when the differential pressure across the filter at which filter regeneration is started is 100%.
It is designed to light up between 50% and 75%.
The lamp 9d (regeneration start notice lamp) lights up while the differential pressure is between 75% and 100% (regeneration start), and the lamp 9e
The (playback lamp) is lit while the playback is being performed.

The operation of the particulate purifying apparatus having the above construction will be described with reference to FIGS. 1, 2 and 3.

At the time of collecting particulates (step 100), the switching valves 5a and 5b are controlled to positions where the total amount of exhaust gas flows through the exhaust pipe 2.

As a result, the exhaust gas flows through the filter 3 and the fine particles in the exhaust gas are collected by the filter 3. The change in the differential pressure across the filter due to the collection is detected by the differential pressure gauge 6. The differential pressure data is sent to the electronic control unit 8 to be calculated, the change in the differential pressure is displayed on the indicator lamp 9, and the collection status is sequentially visually recognized by the driver.

When the regeneration notice lamp 9d lights up as the filter regeneration time approaches (step 101), the driver determines whether to continue driving or to stop the vehicle nearby (step 102). When the operation is continued, the particulate collection amount of the filter 3 further increases, and when the predetermined collection amount (100%) is reached, the regeneration lamp 9e is turned on.

At this time, in response to a signal from the electronic control unit 8, the switching valves 5a and 5b are controlled to a position where the entire amount of exhaust gas is discharged through the bypass pipe 20, the electric heater 4 is energized, and the air pump 7 is operated. Then, the air is supplied to the exhaust pipe 2. As a result, the collected particles in the vicinity of the electric heater 4 are ignited and burned and spread to the upstream side of the filter 3 to burn and remove the collected particles of the entire filter to regenerate the filter 3 (step 106).

When the filter regeneration is completed and the differential pressure across the filter is reduced, the switching valves 5a and 5b, the electric heater 4 and the air pump 7 controlled by the electronic control unit 8 receiving the signal from the differential pressure gauge 6 collect particulates. The lamp 9a of the indicator lamp 9 is turned on at the same time when the situation is restored.

Now, when the reproduction warning lamp 9d is turned on (step 101), if the driver determines that the vehicle will be stopped nearby (step 102), the cancel button 10 is pressed (step 103), and the cancel signal is issued. Is sent to the electronic control unit 8. As a result, even if the differential pressure across the filter reaches 100%, the switching valves 5a, 5b,
A signal for starting regeneration is not sent to the electric heater 4 and the air pump 7, and the collection is continued.

The driver stops the engine, stops the vehicle (step 104), and restarts driving (step 10).
5). At this time, the reproduction cancel signal is released, and when the operation is restarted, if the particulate collection exceeds 100%, immediately after the operation is restarted, and if it is less than 100%, 100% is reached. The filter regeneration is started (step 106).

Although the indicator lamp 9 is used as the display means in the above embodiment, electronic sound or IC voice may be used. Further, although the amount of collected particulates is determined based on the differential pressure across the filter, the engine speed integration and the engine load may be used together. Further, it is possible to add a function of issuing a warning when there is a possibility that the amount of collected fine particles will greatly exceed the set value due to continuous regeneration cancellation.

[0020]

According to the present invention, however, the battery life is shortened due to the engine being stopped during filter regeneration, the possibility of abnormal combustion during the next regeneration is eliminated, and at the time of stopping the vehicle. The safety can be improved. The effects of the present invention can be achieved with a simple structure in which the conventional device is additionally provided with a reproduction canceling means for sending a reproduction canceling signal to the display means for displaying the particulate collection status and the control means.

[Brief description of drawings]

FIG. 1 is a system diagram of an apparatus of the present invention.

FIG. 2 is a flowchart showing the operation of the device of the present invention.

FIG. 3 is a diagram illustrating a display unit and its operation.

[Explanation of symbols]

 1 engine 2 exhaust pipe 3 filter 4 particulate ignition means (electric heater) 5a, 5b switching valve 6 differential pressure gauge 7 air pump 8 control means 9 display means (indicator lamp) 10 regeneration cancel means (cancel button)

Claims (1)

[Claims] 1. A filter installed in the exhaust pipe of a vehicle engine for collecting fine particles contained in exhaust gas,
In an exhaust particulate purifying apparatus equipped with a particulate ignition means for igniting and burning the particulates to regenerate the filter when the particulate collection amount of the filter reaches a predetermined amount, and a control means for controlling the operation of the particulate ignition means, An exhaust particulate purifying apparatus comprising display means for displaying the particulate collection and regeneration status and regeneration canceling means for sending a cancel signal for canceling the next filter regeneration to the control means.