Failure monitoring method of wide-area oxygen sensor for vehicle
An oxygen sensor, failure monitoring technology, applied in the direction of machine/engine, electrical control, mechanical equipment, etc., can solve problems such as increased emissions
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[0062] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0063] The wide-area oxygen sensor failure monitoring method for vehicles involved in the present invention includes the monitoring of the rich-to-lean response hysteresis in the exhaust system. When the fuel is cut off, monitor the reaction time of the fuel in the exhaust gas reflected by the oxygen sensor from rich to lean;
[0064] Monitoring of response hysteresis from rich to lean fuel in exhaust gases, such as figure 1 shown, including the following steps:
[0065] Step 1: In the failure initialization stage, the monitoring signal of the wide-area oxygen sensor is initialized;
[0066] Step 2: In the waiting stage, wait for the engine fuel cut request until the target fuel equivalence ratio FEQR in the exhaust pipe ≤ 0.01, and the actual fuel equivalence ratio FEQR in the exhaust pipe reflected by the wide-area oxygen sensor > 0.9, then ...
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