JPS6439461U

JPS6439461U -

Info

Publication number: JPS6439461U
Application number: JP13429887U
Authority: JP
Priority date: 1987-09-02
Filing date: 1987-09-02
Publication date: 1989-03-09

Description

[Brief explanation of the drawing]

第１図は本考案による混合気供給装置の一実施
例の断面図、第２図はクランキング時におけるア
イドルスピード制御バルブのデユーテイ比と空燃
比との関係を示す図、第３図は第１図の実施例の
うち蒸散防止バルブの他の制御機構を示す図であ
る。３……エアバルブ、８……スロツトルバルブ、
１１……第一バイパス通路、１２……アイドルス
ピード制御バルブ、１３……第二バイパス通路、
１４……スタートエアバルブ、４０……ゼニス大
気通路、４１……始動通路、４３……ゼニス通路
、５０……開閉弁、５１……蒸散防止バルブ、５
３，６４……印加負圧通路、６３……バキユーム
スイツチングバルブ。 Figure 1 is a sectional view of an embodiment of the air-fuel mixture supply device according to the present invention, Figure 2 is a diagram showing the relationship between the duty ratio of the idle speed control valve and the air-fuel ratio during cranking, and Figure 3 is a diagram showing the relationship between the duty ratio of the idle speed control valve and the air-fuel ratio during cranking. It is a figure which shows the other control mechanism of the transpiration prevention valve in the Example of a figure. 3...Air valve, 8...Throttle valve,
11...first bypass passage, 12...idle speed control valve, 13...second bypass passage,
14...Start air valve, 40...Zenith atmospheric passage, 41...Start passage, 43...Zenith passage, 50...Open/close valve, 51...Transpiration prevention valve, 5
3, 64... Applied negative pressure passage, 63... Vacuum switching valve.

Claims

[Claims for Utility Model Registration] (1) The air-fuel ratio of the air-fuel mixture can be kept constant by controlling the fuel flow rate so as to keep the liquid level in the negative pressure passage communicating with the fuel passage constant. A slow system and a main system configured, a Zenith atmospheric passage communicating with the atmosphere, a starting passage having one end communicating with the Zenith atmospheric passage via a throttle and the other end opening into a fuel chamber, and one end thereof. a Zenith passage which communicates with the Zenith atmosphere passage through a throttle and whose other end opens into the intake passage on the downstream side of the throttle valve; and one end between the throttle of the starting passage and the communication portion with the Zenith atmosphere passage. The fuel passage has an auxiliary fuel passage which opens into the starting passage and communicates with the fuel chamber through a throttle in the middle and communicates with the Zenith passage through the throttle at the other end, and maintains a predetermined fuel flow rate in the slow region. The mixture supply device is configured to supply fuel from the auxiliary fuel passage via the Zenith passage, and includes: a transpiration prevention valve that communicates and shuts off the starting passage with the atmosphere by opening and closing; and a negative pressure to the transpiration prevention valve depending on the temperature. negative pressure control means for controlling the opening and closing of the transpiration prevention valve by controlling the introduction of the evaporation prevention valve, and closing the transpiration prevention valve during low-temperature cranking to allow fuel to flow from the starting passage through the auxiliary fuel passage. 1. An air-fuel ratio control device for controlling an air-fuel ratio at the time of starting an engine, characterized in that the replenishment amount of fuel discharged from the Zenith passage is increased by causing the Zenith passage to be discharged. (2) The negative pressure control means includes an applied negative pressure passage that communicates the negative pressure chamber of the transpiration prevention valve with the downstream side of the throttle valve of the intake passage through a throttle, and one end of which is connected to the applied negative pressure passage. The air space according to claim (1) for registration of a utility model, characterized in that the space is formed by a passage that communicates with the first bypass passage through a throttle and the other end opens on the upstream side of the idle speed control valve of the first bypass passage. Fuel ratio control device. (3) Practical use characterized in that the negative pressure control means is a vacuum switching valve disposed in a passage that communicates the downstream side of the air valve and the downstream side of the throttle valve in the intake passage through a throttle, respectively. An air-fuel ratio control device according to claim (1) for patent registration. (4) The transpiration prevention valve has a rod on the valve body that can slide within the Zenith atmospheric passage,
The air-fuel ratio control device according to any one of claims (1) to (3), which is a registered utility model, characterized in that the starting passage is isolated from or communicated with the atmosphere by moving the rod back and forth.