Document Type and Number:
Japanese Patent JPS6132482
Kind Code:
B2
Abstract:
PURPOSE:To reduce the fuel consumption in low or middle load operation range by allowing an intake passage of the downstream of a throttle valve operated by an accelerating pedal to be branched into the primary side and the secondary side intake passages and installing a subthrottle valve whose opening degree is controlled according to the engine loaded state, in the secondary side intake passage. CONSTITUTION:In idling operation in which a throttle valve 6 is set into nearly complete closed state, a high intake negative pressure is introduced into each negative- pressure chamber 12d, 12e of a diaphragm apparatus 12 through negative-pressure conduits 13 and 14. Therefore, a subthrottle valve 10 is closed perfectly through an operating rod 15 and a lever 16through the upward movement of both diaphragms 12b and 12c. Therefore, the mixed gas is drawn in a primary-side intake passage 1a having a small passage area and flows into a combustion chamber 2 with a high flow rate when an intake valve 17 is opened, and a swirl flow is formed. When the throttle valve 6 is opened and transfer to low or middle load operation is performed, introduction of negative-pressure into the negative-pressure chamber 12e is suspended, and a subthrottle valve 10 is opened to an opening degree of, for example, 20. Further, the subthrottle valve 10 is perfectly opened in high-load operation.
Inventors:
TAKAHASHI KOICHI
YADA YOSHIKUNI
NISHIKAWA TOSHIO
NAGAO AKIO
ODA HIROYUKI
YADA YOSHIKUNI
NISHIKAWA TOSHIO
NAGAO AKIO
ODA HIROYUKI
Application Number:
JP17546182A
Publication Date:
July 28, 1986
Filing Date:
October 05, 1982
Export Citation:
Assignee:
MATSUDA KK
International Classes:
F02B31/00; F02B31/08