JPS59156154U

JPS59156154U - Air-fuel ratio switching device for LPG engine

Info

Publication number: JPS59156154U
Application number: JP5054883U
Authority: JP
Inventors: 堀内　朋房
Original assignee: 日産自動車株式会社
Priority date: 1983-04-05
Filing date: 1983-04-05
Publication date: 1984-10-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の空燃比切換装置を示す断面説明図、第２
図けこの考案の一実施例を示す断面説明図である。１・・・ミキサボディ、２・・・−次側吸気通路、３・
・・二次側吸気通路、４・・・−次側絞弁ζ５・・・二
次側絞弁、６・・・燃料通路、８・・・メインアジャス
トスクリュー、２１・・・第１燃料バイパス通路、２２
・・・第２燃料バイパス通路、２３・・・第１空燃比切
換弁、２４・・・第２空燃比切換弁、２９・・・第１ア
クチユエータ、３０・・・第２アクチユエータ、３５．
３６・・・負圧室、３７・・・第１負圧取出口、３８・
・・第２負圧取出口、４１・・・負圧遅延弁。Figure 1 is a cross-sectional explanatory diagram showing a conventional air-fuel ratio switching device;
FIG. 2 is a cross-sectional explanatory view showing an embodiment of this invention. 1...Mixer body, 2...-Next side intake passage, 3.
...Secondary side intake passage, 4...-Next side throttle valve ζ5...Secondary side throttle valve, 6...Fuel passage, 8...Main adjustment screw, 21...1st fuel bypass aisle, 22
... second fuel bypass passage, 23... first air-fuel ratio switching valve, 24... second air-fuel ratio switching valve, 29... first actuator, 30... second actuator, 35.
36... Negative pressure chamber, 37... First negative pressure outlet, 38...
...Second negative pressure outlet, 41...Negative pressure delay valve.

Claims

[Scope of utility model registration request]

A first fuel bypass passage and a second fuel bypass passage provided by bypassing the main adjustment screw of the fuel passage, and a first air-fuel ratio that is interposed in each of both bypass passages and is always biased in the valve-closing direction. a switching valve, a second air-fuel ratio switching valve, a first negative pressure outlet that opens at a position upstream of the throttle valve and relatively downstream as the throttle valve opens when the throttle valve is fully closed; and a first negative pressure outlet opening downstream of the throttle valve. the first air-fuel ratio switching valve is opened in the opening direction when the negative pressure is below a set value; a first actuator that presses the air-fuel ratio switching valve; and a second actuator that has a negative pressure chamber communicating with the second negative pressure outlet and presses the second air-fuel ratio switching valve in the opening direction when the negative pressure is below a set value. An air-fuel ratio switching device for an LPG engine, comprising: