Stock Name: Tianhao Technology Stock Code: 872304
PRODUCT
Product classification
Oxygen Sensor
在(zài)使用三元催化轉換器以(yǐ)減少排氣污染的(de)發動機上(shàng)，氧傳感器是(shì)必不(bù)可少的(de)元件。由于(yú)混合氣的(de)空燃比一(yī / yì ／yí)旦偏離理論空燃比，三元催化劑對CO、HC和(hé / huò)NOx的(de)淨化能力将急劇下降，故在(zài)排氣管中安裝氧傳感器，用以(yǐ)檢測排氣中氧的(de)濃度，并向ECU發出(chū)反饋信号，再由ECU控制噴油器噴油量的(de)增減，從而(ér)将混合氣的(de)空燃比控制在(zài)理論值附近。 前後兩個(gè)氧傳感器隻是(shì)作用不(bù)同而(ér)已。前氧傳感器的(de)作用就(jiù)是(shì)在(zài)“閉環控制”的(de)時(shí)候，向發動機電腦反饋排放廢氣中氧含量，發動機電腦根據此信号修正噴油量。 後氧傳感器安裝在(zài)三元催化轉換器的(de)後方，後氧傳感将三元催化轉換器後方的(de)氧含量反饋給發動機電腦，發動機電腦将兩個(gè)氧傳感器的(de)信号進行對比，正常情況下前氧傳感器的(de)信号高于(yú)後氧傳感器，如果兩個(gè)氧傳感器的(de)信号相同，證明三元催化轉換器失效。
Classification:
Sensors
Product Description
Oxygen sensor is mandatory in application of catalyst to optimize exhaust. When air-fuel ratio of mixed air is off 14.7 to 1, the purification ability of catalyst to CO, HC, and NOX will decrease, so oxygen sensors are installed inside exhaust pipe to check the concentration of oxygen, and send the feedback signal to ECU, then ECU will control petrol injection to make sure the air-fuel ratio is near 14.7 to 1.
Usually there are two oxygen sensors installed, one is in front of catalyst called upstream oxygen sensor, and the other is at the back of catalyst called downstream oxygen sensor. Upstream oxygen sensor checks the concentration of oxygen in exhaust and send the signal to ECU, ECU will then adjust dosage of petrol injection; downstream oxygen sensor also checks the concentration of oxygen after catalyst, and send the signal to ECU, ECU will then compare the two signals sent from upstream sensor and downstream sensor, normally, the signal from upstream sensor should be higher than that of downstream sensor, if the two signals are the same, that means the catalyst may have failed.
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蘇州天浩
SUZHOU TIANHAO
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