FUEL INJECTION SYSTEMS 车辆工程专业英语教学PPT课件.pptx

UNIT 3 FUEL INJECTION SYSTEMSTEXT BTroubleshooting the EFI System ? Engine Condition? Electrical System? Intake Air Leakage? Translation Techniques(3)—词类转换;本次课学习目标;NEW WORDS;vent [vent] v.通风 crankcase[kr??keis] n.曲轴箱 probe [proub] n.探索，探针，探头，取样器 meter [mi:t?] v.计量，测量 proceed [pr?si:d] v.（着手，继续）进行 symptom [simpt?m] n.症状，征兆 continuity [k?ntinjuiti] n.连通，连续性 leakage [li:ki?] n.泄漏 hesitation [hezitei∫?n] n.迟缓，断续工作 surge [s?:?] n.(发动机）喘振，波动，颤抖 clamp [kl?mp] n.夹（具，板，子），夹紧装置；卡箍（子） diaphragm [dai?fr?m] n.膜片;soapy [soupi]a.圆滑的，滑腻的 squirt [skw?:t]v.喷出 gasket [g?skit]n.衬垫 styrofoam [stair?foum]n.聚苯乙烯泡沫（塑料） ;vapor canister 蒸气罐 canister purge valve 炭罐排污阀，炭罐清空阀 false air 从窑炉各处缝隙吸入（炉内）的空气 vacuum hose 真空软管 brake booster 制动助力器 leak detector 检漏器,检漏剂 start by +ing 打…开始，（一）开始就（做） strange as it may sound 听[说]起来也许奇怪;Troubleshooting the EFI System The basic function of the fuel injection system is to supply and meter the correct amount of fuel to the engine in proportion to the amount of air being drawn into the engine to achieve the optimum air-fuel mixture. Any problems with electrical connections, air intake sensing, or fuel supply will cause poor running. Any troubleshooting should begin with simple and easy checks of the tightness of system wiring and the integrity of the air intake system. Proceed from there to more involved troubleshooting. Generally, fuel injection problems fall into one of four symptom categories: cold start, cold running, warm running, and hot start. Warm running is the most basic condition. Before troubleshooting a condition in any other category, make sure that the system is working well and is properly adjusted for warm running. ; To simplify troubleshooting, concentrate on the sensors and components that adapt fuel metering for a particular condition. For example, if the engine will not start when cold, the components responsible for cold start enrichment are most likely at fault, and should be tested first. Engine Conditi