摘  要
車尾氣排放就汽是通過汽車一系列沖程壓縮做工后，所排出的無用“廢氣”氣體?！∑嚺虐l(fā)污染對人類生存環(huán)境和生活用水造成了極大的危害。汽車的排放污染主要來源于發(fā)動機排出的廢氣（約占65%以上）曲軸箱竄氣（約占20%）和燃料供給系統(tǒng)中蒸發(fā)的燃油蒸氣（約占10-20%），汽油機主要排放污染物是ＣＯ?。龋谩。危希亍?br /> 而　影響　汽車尾氣的排放量的因素眾多。三元催轉(zhuǎn)化器大多與排氣管制成，其內(nèi)部由陶瓷體和一些貴重物金屬催化劑組成。如果汽車在較差的路況上行駛時，極易造成底盤刮撞，導致三元催轉(zhuǎn)化器陶瓷體的破碎。破碎的陶瓷體會隨著廢氣進入消聲器中，最終“影響”汽車的排放量。如果使用的汽油和機油質(zhì)量不好，含有過多的的膠體都是極易造成三元催化器的堵塞而“影響”汽車的排放。影響汽車排放因素等一系列解決的措施等等。

關(guān)鍵詞： 廢氣、三元催化轉(zhuǎn)化器、影響?！　　　　　　　　　　　?/p>

Abstract
Motor vehicle exhaust emissions on the compression stroke stroke by car after work the emission of useless waste gas .auto row made pollution on the human environment and the domestic water caused great harm. Pollution comes mainly from vehicleemissionsengine emissions(about65%)crankcase blow-by gases(about20%)and fuel supply system in the fuel vapor evaporated(about10-20%),major emission gasoline engine pollution material is CO HC  NOX.
  The impact of vehicle exhaust emissions of many factors .three yuan catalytic converter and exhaust control as most of its internal by the ceramic body and some of the precious metal catalyst material composition.if the car when driving on poor road conditions can easily result in the chassis scratch hit.leading to three yuan catalytic converter ceramic body broken .experienec with broken ceramic exhaust into the muffler ,the ultimate impact automobile emissions if you use poor quality gasoline and oil,contain too much colloidal are vulnerable to blockage of catalytic converters ,impact automobile emissions .factors that affect vehicle emissions and a series of measures to address and so on.

Keywords：exhaust、catalyticconverter、impact.

目錄
摘  要 2
1．排放控制系統(tǒng) 6
1.1燃油蒸發(fā)排放（EUAP）控制系統(tǒng)。 6
1.2活性炭罐的影響： 6
1.3廢氣再循環(huán)系統(tǒng) 6
1.4三元催化轉(zhuǎn)化器與空燃比反饋控制系統(tǒng) 7
1.5二次空氣噴射系統(tǒng) 8
1.6空氣泵系統(tǒng): 8
1.7脈沖空氣系統(tǒng): 8
2.電子節(jié)氣門控制系統(tǒng)概述 9
2.1電子節(jié)氣門控制系統(tǒng)的結(jié)構(gòu)組成及工作原理 9
2.2電子節(jié)氣門控制系統(tǒng)常見故障分析 9
2.3電子節(jié)氣門控制系統(tǒng)控制的檢修 10
3.影響汽車尾氣排放不良診斷步驟方法案例分析 11
3.1汽車尾氣排放不達標的診斷步驟 11
3.2案例分析 12
謝辭 13
參考文獻 14
附錄 15
一、 汽車排放系統(tǒng)的檢查保養(yǎng)。 15
二、 檢查方法。 15