JPH0317261U

JPH0317261U -

Info

Publication number: JPH0317261U
Application number: JP7793489U
Authority: JP
Priority date: 1989-06-30
Filing date: 1989-06-30
Publication date: 1991-02-20

Description

[Brief explanation of drawings]

第１図は本考案の一実施例に係るＬＰＧ内燃機
関用アイドルアツプ装置の全体構成図、第２図は
同装置に設けられたアイドルアツプ制御用電磁弁
の制御用論理回路図、第３図は同電磁弁の他の制
御用論理回路図である。１１……吸気通路、１２……ベンチユリ部、１
３……スロツトルバルブ、１５，１６……補助混
合気通路、２０，２１……アイドルアツプ制御用
電磁弁、２３……空燃比制御用電磁弁、３０……
ベーパライザ、３１……メイン燃料通路、３２…
…補助燃料通路、４１……エンジン回転数センサ
、４２……プレツシヤセンサ、４３……スロツト
ルセンサ、４４……エアコンデイシヨナスイツチ
、４５……電気負荷スイツチ。 Fig. 1 is an overall configuration diagram of an idle up device for an LPG internal combustion engine according to an embodiment of the present invention, Fig. 2 is a logic circuit diagram for controlling an idle up control solenoid valve provided in the device, and Fig. 3 is another control logic circuit diagram of the same solenoid valve. 11... Intake passage, 12... Bench lily part, 1
3... Throttle valve, 15, 16... Auxiliary mixture passage, 20, 21... Solenoid valve for idle up control, 23... Solenoid valve for air-fuel ratio control, 30...
Vaporizer, 31... Main fuel passage, 32...
... Auxiliary fuel passage, 41 ... Engine speed sensor, 42 ... Pressure sensor, 43 ... Throttle sensor, 44 ... Air conditioner station switch, 45 ... Electric load switch.

Claims

[Scope of utility model registration request]

A main fuel passage that communicates between a vent lily portion formed in the intake passage and the vaporizer, an auxiliary fuel passage that communicates the intake passage downstream of the throttle valve with the vaporizer, and an intake passage that bypasses the throttle valve and is downstream of the vent lily portion. an auxiliary mixture passage that communicates with the intake passage downstream of the throttle valve; an air-fuel ratio control solenoid valve that conducts or shuts off the auxiliary fuel passage; and an idle-up control solenoid valve that connects or shuts off the auxiliary mixture passage. In the LPG internal combustion engine idle up device, the vaporizer has a primary decompression chamber that reduces the pressure and vaporizes LPG to a positive pressure higher than atmospheric pressure, and a secondary decompression chamber that reduces the pressure and vaporizes the LPG flowing from the decompression chamber to approximately atmospheric pressure. A decompression chamber is provided, the auxiliary fuel passage communicates with a primary decompression chamber, the main fuel passage communicates with a secondary decompression chamber, and the air-fuel ratio control solenoid valve is connected to an engine rotation speed sensor for detecting engine rotation speed and an intake air The opening/closing control is performed based on the output signal of the pressure sensor that detects the negative pressure in the pipe, and the solenoid valve for idle up control is operated by an air conditioner switch that detects the operation of the air conditioner and the opening degree of the throttle valve. An idle up device for an LPG internal combustion engine, characterized in that opening and closing control is performed based on output signals of a throttle sensor and an electric load switch that detects the operation of a predetermined electric load in a vehicle interior.