Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Patent
1974-11-11
1976-08-24
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
F02B 7510
Patent
active
039759059
ABSTRACT:
A secondary air flow rate control device for use in an exhaust gas purifying device of the type in which the secondary air delivered from an air pump is fed through an air passage to an exhaust gas purifying device provided in an exhaust system for purifying the unburnt components contained in exhaust gases from an internal combustion engine, while an aperture for bleeding air to atmosphere is provided in the aforesaid air passage, with a valve being provided in the aforesaid aperture, so that at the time of acceleration of an engine, the aforesaid valve is closed to increase the amount of the secondary air to be fed to the exhaust gas purifying device. This secondary air flow rate control device includes an air flow rate control mechanism for driving the valve which is provided in the aforesaid aperture for bleeding air to atmosphere, and an acceleration detecting mechanism for detecting the accelerating condition of an engine according to the pressure in a suction pipe, the aforesaid acceleration detecting mechanism being integral with the aforesaid air flow rate control mechanism, whereby by directly driving the aforesaid air flow rate control mechanism by using a pressure detected by means of the aforesaid acceleration detecting mechanism, the aforesaid aperture open to atmosphere is closed at the time of acceleration of an engine to thereby increase the amount of the secondary air to be fed to the exhaust gas purifying device, thus improving the responsive characteristics of the air flow rate control mechanism, with the additional advantages of achievement of compactness and simplicity for the construction of the air flow rate control device.
REFERENCES:
patent: 3805522 (1974-04-01), Sheppard
patent: 3818702 (1974-06-01), Woo
patent: 3849984 (1974-11-01), Toda
Atago Takeshi
Shimo Shoji
Hart Douglas
Hitachi , Ltd.
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