JPH0330563U

JPH0330563U -

Info

Publication number: JPH0330563U
Application number: JP9120589U
Authority: JP
Priority date: 1989-08-02
Filing date: 1989-08-02
Publication date: 1991-03-26

Description

[Brief explanation of drawings]

第１図は本考案の請求項１の構成の実施例を示
す図、第２図は請求項２の構成の実施例を示す図
、第３図は第２図の構成の変形例を示す図である
。符号の説明、１…エンジン、２…吸気多岐管、
３…吸気多岐管の集合管部、４…スロツトルボデ
イ、５…絞り弁、６…電磁燃料噴射弁、７…エン
ジン冷却水通路、８…エンジン冷却水を導く通路
、９，９ａ…電磁弁、１０…吸気温センサ、１１
…制御回路、１２…リレー、１３…電源、１４…
負圧開閉弁、１５…負圧作用室、１６…負圧通路
、１７…サージタンク、１８…整流弁、１９…負
圧タンク。 FIG. 1 is a diagram showing an embodiment of the structure of claim 1 of the present invention, FIG. 2 is a diagram showing an embodiment of the structure of claim 2, and FIG. 3 is a diagram showing a modification of the structure of FIG. 2. It is. Explanation of symbols, 1...Engine, 2...Intake manifold,
3... Collecting pipe portion of intake manifold, 4... Throttle body, 5... Throttle valve, 6... Electromagnetic fuel injection valve, 7... Engine cooling water passage, 8... Passage for guiding engine cooling water, 9, 9a... Solenoid valve, 10 ...Intake temperature sensor, 11
...control circuit, 12...relay, 13...power supply, 14...
Negative pressure on/off valve, 15... Negative pressure action chamber, 16... Negative pressure passage, 17... Surge tank, 18... Rectifier valve, 19... Negative pressure tank.

Claims

[Scope of claim for utility model registration] (1) A plurality of electromagnetic fuel injection valves 6 in the intake manifold 2
This is a device for preventing freezing of a throttle valve 5 of a throttle body 4 disposed in a collecting pipe section 3 at the inlet of the intake manifold 2 of an engine 1 in which the throttle body 4 is provided with engine cooling water for heating the throttle body 4. A passage 7 and an intake air temperature sensor 10 are arranged, and a passage 8 that guides engine cooling water to the engine cooling water passage 7 is controlled by the output of a control circuit 11 that inputs an output signal of the intake air temperature sensor 10. A solenoid valve 9 is disposed to conduct and cut off the air, and when the intake air temperature is below a set temperature, the solenoid valve 9 is opened to circulate engine cooling water through the engine cooling water passage 7,
A throttle valve anti-icing device that closes the electromagnetic valve 9 when the intake air temperature exceeds a set temperature to stop circulation of engine cooling water in the engine cooling water passage 7. (2) A negative pressure on/off valve 14 is disposed in the passage 8 that introduces engine cooling water to the engine cooling water passage 7 in place of the solenoid valve 7, and the engine 1 is placed in the negative pressure action chamber 15 of the negative pressure on/off valve 14. a solenoid valve 9a that switches and introduces the intake negative pressure or atmospheric pressure according to the output of the control circuit 11 which inputs the output signal of the intake temperature sensor 10;
When the intake air temperature is below a set temperature, the negative pressure on/off valve 14 is opened to circulate the engine cooling water through the engine cooling water passage 7, and when the intake temperature is above the set temperature, the negative pressure on/off valve 14 is closed to circulate the cooling water. A throttle valve anti-icing device that stops the circulation of engine cooling water to passage 7.