Temperature rises
Driving
Air
Canister vapour
Solution = Roll Over Valve (ROV)
Pomp module
Driving
Why just not a nipple with filter ? Crash ? ROV shuts-off.
油箱系统简介 Fuel Venting System Introdu
燃油储存
燃油输送
燃油箱系统
呼吸
安装/噪音保护
安全
2.排气过程简介
2.1 加油过程
Filling of the fueltank
vapour out
fuel in
Filling of the fueltank
是油箱内部位负压 密闭油箱和阀门 经过一段时间检测油箱内部的压力变化 如果有变化说明有泄漏
OBD carbon canister
Purge valve LDP leak detection pump
与负压相似，只不过油箱内建立的为正压
Thank you for your time!! Any Question?
Fuel from and to engine
2.2 供油过程
Pomp module
If fuel goes out tank, air must go in !! Temperature rises
Driving
Pomp module
Car stops. Temperature is high, Pressure build-up in the tank
油蒸汽
油蒸汽会进入大气
燃油
Filling of the fueltank
油蒸汽无法通过 压力上升
加油直到燃油液位没过循 环管，使加油枪跳枪，即 加油结束
Filling of the fueltank
Vapour
Vapor is released in the environnement !!!
Fuel in
Fuel
Cannister
Fuel...
3.OBD 简介
• OBD = 车载自动诊断系统 • 在一系列汽车自动测试中必须满足汽车排放法规的要求 • How ..?
– 欧洲 = 满足要求但不必自动检测 – 美国 =满足要求但必须自动检测 – China = 将要实行
OBD
碳罐
Purge valve air valve
Fuel in
FLVV = locks off. Pressure build-up. Fuel goes up into fillerpipe. Filling gun shuts off. Fuelvapors are stored into the carbon cannister
Driving
在美国不允许，油蒸汽必须进入发动机燃烧
Filling
FLVV
碳罐
Vapour
Purge air
Fuel in FLVV = Fill Limit Vent Valve ORVR = On Board Vapour Recovery
Filing
FLVV
carbon canister
Purge air
谢谢！