Secondary air supply system for an internal combustion engine

Details Secondary air supply system for an internal combustion engine Secondary air supply system for an internal combustion engine

1990-11-27

1992-03-17

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60307, 123 4149, F01N 332, F01P 710

Patent

active

050956914

ABSTRACT:
A secondary air supply system for an internal combustion engine includes a first hydraulic passage including a first hydraulic motor for an engine cooling fan. The system further includes a second hydraulic passage including a second hydraulic motor for a secondary air supply pump. At a connecting point of the first hydraulic passage and the second hydraulic passage, a hydraulic passage switching valve is installed. The hydraulic passage switching valve causes oil to flow through the second hydraulic passage to drive the air pump for a few minutes after engine start and then switches to cause the oil to flow through the first hydraulic passage to drive the engine cooling fan. In this way, the secondary air supply pump is driven not by a pulley-belt assembly but by a hydraulic system, and a single hydraulic pump can be used for driving both the engine cooling fan and the secondary air supply pump.

REFERENCES:
patent: 3771921 (1973-11-01), Rohde
patent: 4709666 (1987-12-01), Merz
patent: 4794883 (1989-01-01), Fukami
patent: 4798050 (1989-01-01), Nakamura

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