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คำตอบที่ 9
ลอกมาจากที่นี่ครับ http://www.chaosboyz.nl/rubriek/techniek/techlpg.htm
Back-fire safety protection
There are two ways of back-fire protection.
Active back-fire protection;
Active back-fire protection is a way to minimise the chances of getting a back-fire. This can be done by: - starting automatically on petrol - giving LPG and petrol for several seconds when switching over from petrol to LPG The chances of getting a back-fire are the highest during the starting procedure. This risk can be minimised: - Start on petrol and switch after a little while over to LPG. This can be done by an electronic switch with a time delay, with a vacuum switch which measures the under pressure in the air intake manifold, a ref. counter or a combination of the three. - Starting on petrol and LPG. After deactivating the starter engine of the petrol injection will be shut off.
Passive back-fire protection;
Passive back-fire protection is a way to minimise the damage of a back-fire. This can be done by: - Installing blow-back valves which will open by overpressure in the air intake system. The overpressure can escape and afterwards the valve closes itself. Plastic air filter boxes can't cope with high over pressure and will split open when a back-fire occurs. - Installing an air-flap opener. The airflap will be opened during the time the engine is running on LPG. If a back-fire happens the pressure can pass without damaging the airflap. They can be operated by LPG pressure from the vaporiser or by the under pressure in the air intake manifold. Once the airflap is damaged it has to be replaced. The replacement is very expensive.
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