濟南奧迪A6轎車發動機為什么有時熄火

來源：http://www.philiprobert.com發布時間：2017-12-11 15:07:30

停車檢查，發動機明顯工作不穩，并伴有隨發動機嚴重抖動。用V.A.G1551故障診斷儀檢測發動機電控部分，無故障顯示。讀取各傳感器監測到的數據和各執 行器工作時的數據，均在規定范圍內。測量點火提前角也正常。測量怠速轉速，在450-600r/min之間波動。說明發動機電控部分正常，因此檢查非電控 部分。
Parking inspection, the engine is obviously unstable, accompanied by severe jitter with the engine. The V.A.G1551 fault diagnosis instrument is used to detect the electronic control part of the engine without fault display. It is within the specified range that the data that the sensors are monitored and the data of the work of each actuator are read. The measurement of ignition advance angle is also normal. Measure idle speed, fluctuate between 450-600r/min. It indicates that the electric control part of the engine is normal, so the non electric control part is checked.
有可能造成怠速熄火的因素有：氣閥關閉不嚴或進氣系統漏氣；供油壓力不當或供油系統臟堵；噴油嘴臟堵或磨損；怠速穩定閥臟堵或磨損；點火系統漏電或點火能量 不足；火花塞工作不良或失效；燃油蒸氣排放控制系統漏氣；廢氣再循環即EGR系統工作不良；廢氣凈化裝置等。經檢測各氣缸壓力、進氣管真空度、供油系統壓 力、噴油嘴噴油量、怠速穩定閥點火系統均正 常，阻斷燃油蒸氣通道使其暫停工作，無效；阻斷EGR系統廢氣通道使其暫停工作，故障消失。
May cause idling flameout factors: valve is not tightly closed or air intake system; supply pressure or improper fuel system fouling; Fuel Injector Fouling or idling valve wear; fouling or wear; ignition system leakage or ignition energy shortage; the spark plug is bad or failure; fuel vapor emission control system leak EGR; exhaust gas recirculation system bad; exhaust gas purification device, etc.. After testing, the cylinder pressure, intake pipe vacuum degree, oil supply system pressure, fuel injection volume of the nozzle and idle speed stabilizing valve ignition system are all normal, blocking the fuel vapor channel to make it suspend work. It is invalid, blocking the exhaust passage of the EGR system to make it suspend work and failure disappear.
由此判定，是EGR系統故障造成怠速熄火。奧迪A6轎車EGR 系統的工作原理是：發動機控制電腦根 據發動機的轉速、負荷(節氣門開度)、溫度、進氣流量、排氣溫度控制電磁閥適時地打開，進氣管真空度經電磁閥進入EGR閥真空膜室，膜片拉桿將EGR閥門 打開，排氣中的少部分廢氣經EGR閥進入進氣系統，與混合氣混合后進入氣缸參與燃燒。

As a result, it is the EGR system failure to cause idling to extinguish. The working principle of the EGR system of Audi A6 sedan is the engine control computer according to the engine speed and load (solar term door opening), temperature, gas flow rate, the exhaust temperature control solenoid valve to open the inlet pipe, the vacuum solenoid valve by valve into the EGR vacuum membrane chamber, diaphragm rod EGR valve is opened, a small part of exhaust gas the EGR in the exhaust valve into the intake system, and the mixed gas mixture into the cylinder in combustion.
少部分廢氣進入氣缸參與混合氣的燃燒，降低了燃燒時氣缸中的溫度，因 NOX是在高溫富氧的條件下生成的，故抑制了NOX的生成，從而降低了廢氣中的NOX的含量,但是，過度的廢氣。參與再循環，將會影響混合氣的著火、性 能，從而影響發動機的動力性，特別是在發動機怠速、低速、小負荷及冷機時，再循環的廢氣會明顯地影響發動機性能。
A small part of exhaust gas enters the cylinder and participates in the combustion of mixed gas, and reduces the temperature in the cylinder during combustion. Because NOX is generated under the condition of high temperature and oxygen enrichment, it inhibits the generation of NOX, thereby reducing the content of NOX in exhaust gas, but excessive exhaust gas. Participation in recycling will affect the ignition and performance of the mixture, thereby affecting the power performance of the engine, especially when the engine is idle, low speed, small load and cold engine, the recycled exhaust gas will obviously affect the engine performance.
所以，當發動機在怠速、低速小負荷 及冷機時，ECU控制廢氣不參與再循環，避免發動機性能受到影響；當發動機超過一定的轉速、負荷及達到一定的溫度時，ECU控制少部分廢氣參與再循環，而 且，參與再循環的廢氣量根據發動機轉速、負荷、溫度及廢氣溫度的不同而不同，以達到廢氣中的NOX較低。
So, when the engine is at idle speed, low speed and low load and cooler, ECU does not participate in the control of exhaust gas recirculation, avoid the engine performance is affected; when the engine speed, and more than a certain load reaches a certain temperature, the ECU control part of exhaust gas recirculation and less participation, participation, the quantity of exhaust gas recirculation varies according to engine speed and load the temperature and temperature of exhaust gas is different, in order to achieve the lowest emissions NOX.
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