Title:
DIFFERENTIAL PRESSURE DETECTION DEVICE FOR ENGINE
Document Type and Number:
WIPO Patent Application WO/2013/084627
Kind Code:
A1
Abstract:
The invention of the present application relates to a differential pressure detection device for detecting differential pressure in an exhaust pipe line of an engine. A differential pressure type flow meter (47) measures an exhaust gas flow rate by detecting the differential pressure across a throttle mechanism (471) provided in an EGR pipe (34A) by a differential pressure sensor (472). A communication pipe (474) for causing a pair of pressure guiding pipes (473a, 473b) for guiding the pressure of exhaust gas to the differential pressure sensor (472) to communicate with each other is provided, and an electromagnetic opening/closing valve (473b) for opening and closing the communication pipe (474) is provided. In a state in which the engine is being rotated and the supply of fuel to the engine is being stopped, the electromagnetic opening/closing valve (473b) is controlled to be opened. Consequently, clogging of the pressure guiding pipes (473a, 473b) is suppressed by causing the exhaust gas to flow via the pressure guiding pipe (473a), the communication pipe (474), and the pressure guiding pipe (473b) to thereby perform scavenging for blowing off soot and the like hitherto deposited in the pressure guiding pipes (473a, 473b).
Inventors:
SASAOKA SHINICHI (JP)
Application Number:
PCT/JP2012/078213
Publication Date:
June 13, 2013
Filing Date:
October 31, 2012
Export Citation:
Assignee:
UD TRUCKS CORP (JP)
International Classes:
G01L19/06; F02M25/07; G01F1/38; G01L13/00; G01L23/24
Foreign References:
| JPH0763121A | 1995-03-07 | |||
| JPH04328435A | 1992-11-17 | |||
| JPH07280685A | 1995-10-27 | |||
| JP2006233957A | 2006-09-07 |
Attorney, Agent or Firm:
SASAJIMA, Fujio (JP)
Sasajima Wealth 2 male (JP)
Sasajima Wealth 2 male (JP)
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Claims: