Title:
EXHAUST GAS PURIFYING DEVICE OF TWO STAGE SUPERCHARGED INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JPH0417714
Kind Code:
A
Abstract:
PURPOSE:To obtain expected exhaust gas purifying performance reducing the size of a catalyst device by arranging a small-sized catalyst device at a position on the upper stream side of the section junctioning with an exhaust by-path on the down stream side of the turbine of a small-sized turbocharger. CONSTITUTION:A large-sized low pressure stage turbocharger 17 and small-sized high pressure stage turbocharger 18 are arranged in series in the gas flow direction, and an exhaust cut-off poppet valve 38 is provided in an exhaust by-path 36 making a detour of the turbocharger 18. Each working area of the turbochargers 17 and 18 is changed-over by opening and closing the exhaust cut-off poppet valve 38. A small-sized catalyst device 84 is arranged at a position on the upper stream side of the section junctioning with the exhaust by-path 36 on the down stream side of the turbine 28 of the turbocharger 18, and a large-sized catalyst device 86 is arranged at a position in the downstream of the turbine 22 of the turbocharger 17. Owing to this constitution, exhaust gas is effectively purified by the catalyst device 84 in the rotation at a low speed and low load by 2 stage supercharging and by the catalyst device 86 in the rotation at a high speed and high load by 1 stage supercharging respectively.
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Inventors:
YANAGIHARA HIROMICHI
Application Number:
JP11766090A
Publication Date:
January 22, 1992
Filing Date:
May 09, 1990
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F02B37/013; F01N3/24; F02B37/16; F02B37/18; F02M25/07; (IPC1-7): F01N3/24
Attorney, Agent or Firm:
Aoki Akira (4 outside)
Next Patent: JPH0417715