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[quote][i]Algselt postitas: quattromees[/i] Lambda kohta: A slow responding O2 sensor that has been contaminated, or is just out and tired out, can cause some surging while cruising at steady speed, poor acceleration or hesitation. If you suspect you have a slow responding or defective O2 sensor, you can temporarily disconnect the single black lead from the O2 sensor and then drive the vehicle again to see if the poor running was caused by a defective sensor. Normally the basic idle mixture is set to be 0.6% to 1.2% Carbon Monoxide (CO) when the exhaust gas is measured up stream of the catalytic convertor. Once the Oxygen (O2) Sensor warms up (Heated O2 sensor), the system will switch over to closed loop operation. This sensor is used to monitor oxygen levels in the exhaust and acts as a voltage supply that transitions high to low when the oxygen level is high (slightly lean above 14:7 to 1 air fuel ratio) and transitions low to high when the Oxygen level is low (slightly rich air fuel mixture below 14:7 to 1 air fuel ratio). The ECU uses this oxygen sensor signal to tweak the air fuel mixture back and forth close to the ideal 14.7 to 1 Air Fuel Ratio. With the fuel system in closed loop operation after the O2 sensor warms up, the O2 sensor voltage cycles up and down between ~0.1V and ~0.9V. At idle, the O2 voltage should cycle back and forth 1 to 2 times per second and when cruising, it should cycle back and forth ~4 to 5 times per second. This cycling occurs because the engine computer senses the O2 voltage and then changes the pulse width of the signal driving the fuel injector on and off. This switching action allows the ECU to do minor adjustments to the air fuel ratio to allow the catalytic convertor to perform its job to optimize the "oxidation" of Carbon Monoxide (CO) and Hydrocarbons (HC) and the reduction of Nitrogen Oxides (NOx). The oxidation occurs when the mixture is slightly lean and more oxygen is available, and the reduction occurs when the mixture is slightly rich and less oxygen is available. [/quote]
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Eesti Audi Klubi foorum
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Mootor, ülekanne & veermik
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Mootoril hing kinni
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XMB Audi Club Edition
Täiendanud: indro, klem, j6mm & diversion @ 2002-2020
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