JPH01139064U

JPH01139064U -

Info

Publication number: JPH01139064U
Application number: JP3465188U
Authority: JP
Priority date: 1988-03-15
Filing date: 1988-03-15
Publication date: 1989-09-22
Also published as: JPH0248685Y2

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例を示す全体構成図、
第２図は本実施例のコントロールユニツトによる
制御方法を示すフローチヤート図、第３図はアイ
ドル運転と減速運転を識別する基準となるエンジ
ン回転数―冷却水温度特性曲線、第４ａ図〜第４
ｃ図は本実施例に用いた電磁弁の開閉作動とエン
ジン回転数およびスロツトルバルブの開度との関
係を示すタイムチヤート図、第５ａ図〜第５ｃ図
はスロー燃料通路を介して供給される燃料の空燃
比と吸気管負圧及びスロツトルバルブの開度との
関係を示すタイムチヤート図である。１……ＬＰガスエンジン用燃料供給装置、６…
…一次減圧室、１８……二次減圧室、２１……メ
イン燃料通路、２６……スロー燃料通路、２７…
…コントロールユニツト、２８……電磁弁、２９
ａ……スタータスイツチ、２９ｂ……イグニシヨ
ンスイツチ、２９ｃ……スロツトルスイツチ、２
９ｄ……回転数検出手段、２９ｅ……温度検出手
段、３０……混合器。 FIG. 1 is an overall configuration diagram showing one embodiment of the present invention;
Fig. 2 is a flowchart showing the control method by the control unit of this embodiment, Fig. 3 is an engine speed-cooling water temperature characteristic curve that serves as a standard for distinguishing between idling operation and deceleration operation, and Figs. 4a to 4.
Figure c is a time chart showing the relationship between the opening/closing operation of the electromagnetic valve used in this example, the engine speed, and the opening degree of the throttle valve. FIG. 3 is a time chart showing the relationship between the air-fuel ratio of the fuel, the intake pipe negative pressure, and the opening degree of the throttle valve. 1... Fuel supply device for LP gas engine, 6...
...Primary decompression chamber, 18...Secondary decompression chamber, 21...Main fuel passage, 26...Slow fuel passage, 27...
...Control unit, 28...Solenoid valve, 29
a... Starter switch, 29b... Ignition switch, 29c... Throttle switch, 2
9d...Rotation speed detection means, 29e...Temperature detection means, 30...Mixer.

Claims

[Claim for Utility Model Registration] A primary decompression chamber for vaporizing LP gas under reduced pressure, and a secondary decompression chamber connected to the primary decompression chamber, with the primary decompression chamber connected to an LP gas mixer via a slow fuel passage. In a fuel supply system for an LP gas engine in which a secondary depressurization chamber is connected to an LP gas mixer via a main fuel passage, the fuel supply system is arranged in the slow fuel passage and disconnects communication from the slow fuel passage to the mixer. The solenoid valve that controls the flow rate of the supplied LP gas, the starter switch that is operated when starting the engine, the ignition switch that is operated when the engine is ignited, and the throttle valve of the LP gas mixer are in the idle opening position. a throttle switch for detecting whether or not the engine is running; a rotation speed detection means for detecting the engine rotation speed; a temperature detection means for detecting the temperature of the engine cooling water; a starting control means for controlling the valves in communication; and controlling the electromagnetic valve in communication when the engine is in an idling operating state based on output signals of the starter switch, ignition switch, throttle switch, rotation speed detection means, and temperature detection means. death,
and a deceleration control means for controlling the solenoid valve to shut off when the solenoid valve is in a deceleration operation state.
Fuel supply device for gas engines.