JPS59155526A - Diesel engine exhaust purification device - Google Patents

Abstract

PURPOSE:To efficiently perform the regeneration of a filter by a method wherein, if the engine key turns to be OFF during the regenerative operation of the filter by means of a fuel injection device and the like, the remaining time for regeneration is memorized and, after that, when said key turns to be ON, the instruction to perform the regenerative operation for said remaining period of time is outputted. CONSTITUTION:The exhaust gas discharged from a diesel engine 1 flows via an exhaust pipe 2 through a filter 3. At this time, black smoke in the exhaust gas is caught by the filter 3. In this case, the pressure loss at the filter 3 becomes larger in proportion to the increase of the amount of black smoke caught by the filter 3. When a pressure sensor 4 detects that the exhaust pressure exceeds the set value and at the same time the detected result is stored in a microcomputer 5. After that, if a key switch turns to be OFF, a timer in the microcomputer 5 is reset. Next, the timer starts to count simultaneously when a key switch turns to be ON and the position of an injection pump 7 becomes the operating position. After that, a burner is operated to burn for a required period of time, resulting in efficiently regenerating the filter 3.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a diesel engine exhaust purification device, and in particular to a method for rationally obtaining the oxidation time necessary to oxidize black smoke collected in a filter. Regarding.

[Prior art]

Conventional diesel engine exhaust black smoke filter regeneration timing is determined by continuously storing the exhaust pressure in advance and starting oxidation during idling after the measured exhaust pressure reaches the limit exhaust pressure. Method (Japanese Utility Model Application Publication No. 57-136814) Five methods have been devised (Japanese Utility Model Application Publication No. 57-126515) in which oxidation is started immediately when the amount of collected material exceeds a set value.

・Also, there is a method in which the filter is oxidized at all times except when the filter is at high temperature or under high load (Special Publication Hmb: 5-509), and a method in which the filter is regenerated periodically (Japanese Unexamined Patent Publication No. 56-98519).
However, with any of the conventional methods, there is a possibility that the engine key will be turned off during oxidation, and in that case, even though the regeneration is stopped in the middle of filter regeneration, the engine key may be turned off. No specific control method has been devised for subsequent regeneration.

[Purpose of the invention]

The present invention provides an apparatus for rationally performing regeneration processing.

[Summary of the invention]

In the present invention, when the engine key is turned off during filter regeneration, the remaining regeneration time is stored in a microcomputer, and the next time the engine key is turned on, the remaining time is controlled to be regenerated. It is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1. Exhaust gas discharged from a diesel engine I passes through an exhaust pipe 2 and a filter 3. Black smoke present in the exhaust gas is collected by the filter 3. However, as the particulates are collected, the pressure loss of the filter increases, which adversely affects driveability and fuel efficiency. At the same time when the pressure case/suction 4 detects that the exhaust pressure has exceeded the set value, the microcomputer 5 stores in memory that the exhaust pressure has exceeded the set value. When the key switch 6 is turned off, the timer in the microcomputer 5 is reset. At this time, the information that the value is greater than or equal to the set value is not cleared and remains, and then the key switch 6 is turned on and the injection pump 7 is brought into operation, at the same time the timer starts counting. When the timer value reaches 1 minute, the air pump 8 starts operating and the spark plug 10 starts sparking.

The temperature sensor 9 then detects the current filter temperature. Then, fuel injection starts from the burner 11, and the spark plug 10 connects and disconnects the fuel. For ignition, the 7 timer starts from 0 and the power is "runt". After combustion has been carried out for the required combustion time, the fuel from the fuel pump 13 is cut off by the solenoid pulp 14 to extinguish the fire.

In this process, if the engine key is turned OFF during burner combustion, the time of combustion until the key is turned off is stored as t' in the microcomputer, and the state in which the engine starts is 0. ■When setting the combustion time t on the counter @ the already burned time t'
Subtract and set. A 70-chart of the above control is shown in FIG.

〔Effect of the invention〕

By adopting this control method, the filter can be efficiently regenerated even when the engine key is frequently turned off, increasing the rationality of controlling the diesel engine exhaust particulate reduction system. The durability is also improved.

[Brief explanation of drawings]

FIG. 1 shows a diesel engine exhaust purification system using the control of the present invention. Outline "i!ZJ,'i 'i!':XJ
d is a flowchart showing an example of control of 1. 1...Diesel engine, 2...Exhaust pipe, 3...
・Filter, 4...Pressure sensor, 5...Microcomputer, 6...Key switch, 7...Injection pump, 8...Air bomb, 9...Temperature sensor, 1o
...Spark plug, 11...Burner, 12...7 Flame sensor, 13...Fuel pump, 1-4 river solenoid pulp. 1,000 2 figures

Claims (1)

[Claims] 1. It has a filter that collects black smoke contained in the exhaust gas of a diesel engine, and a fuel injection device or electric heater that provides the atmosphere necessary to regenerate the filter that has collected the black smoke. , a luti-cell engine exhaust purification device having an information processing function that determines the operating time of the fuel injection device or the electric heater based on various information indicating the engine condition, in which a filter is provided by the fuel injection device or the electric heater. If the engine key turns OFF during playback, the information processing device stores the remaining playback time and issues a command to be executed next time when the engine key turns ON. Diesel engine exhaust purification device.