JPH0327820U

JPH0327820U -

Info

Publication number: JPH0327820U
Application number: JP8747189U
Authority: JP
Priority date: 1989-07-27
Filing date: 1989-07-27
Publication date: 1991-03-20
Anticipated expiration: 2004-07-27
Also published as: JPH0634573Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す全体構成図、
第２図は制御フローチヤート図、第３図はパーテ
イキユレイトの捕集状態を判断する出入口差圧の
タイミングチヤート図、第４図は排気通路の切換
を判断する排気温度のタイミングチヤート図、第
５図はヒータ温度のタイミングチヤート図である
。２，５……排気通路、３……第１分岐通路、４
……第２分岐通路、６……第１トラツプフイルタ
、７，１２……電気ヒータ、８，１３……温度セ
ンサ、９……第１電磁弁、１０……第２電磁弁、
１１……第２トラツプフイルタ、１４……第３電
磁弁、１５……第４電磁弁、１６……排気温度セ
ンサ、１７……入口圧センサ、１８……出口圧セ
ンサ、１９……コントローラ。 FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Fig. 2 is a control flowchart, Fig. 3 is a timing chart of the inlet/outlet differential pressure that determines the particulate collection state, Fig. 4 is a timing chart of the exhaust temperature that determines the switching of the exhaust passage, FIG. 5 is a timing chart of heater temperature. 2, 5... Exhaust passage, 3... First branch passage, 4
...Second branch passage, 6...First trap filter, 7, 12...Electric heater, 8, 13...Temperature sensor, 9...First solenoid valve, 10...Second solenoid valve,
DESCRIPTION OF SYMBOLS 11...Second trap filter, 14...Third electromagnetic valve, 15...Fourth electromagnetic valve, 16...Exhaust temperature sensor, 17...Inlet pressure sensor, 18...Outlet pressure sensor, 19...Controller.

Claims

[Scope of utility model registration request]

The exhaust passage is branched into two branch passages, each branch passage is provided with a trap filter equipped with an electric heater, three-way solenoid valves are provided on the upstream and downstream sides of the trap, and the exhaust temperature is controlled upstream of the upstream solenoid valve. A detection means and an inlet pressure detection means are provided, an outlet pressure detection means is provided downstream of the downstream side solenoid valve, a temperature detection means is provided in the trap, and the solenoid valves of both traps are controlled to alternately collect the trap. Immediately after the inlet and outlet differential pressure determined based on the signals from the inlet and outlet pressure detection means reaches a predetermined value, and when the signal value from the exhaust temperature detection means reaches a predetermined value, A particulate trap filter comprising: a control means for starting regeneration and controlling energization to the heater in accordance with a detected value from the temperature detection means.