1、 1 附录：英汉对照 Automotive oxygen sensor failure and inspection of the common The automotive industry is currently in the international application of the sensor on one of the largest markets, and the oxygen sensor reported the number of patents, ranking the first in automotive sensors. Oxygen sensor ins
2、talled in the vehicle exhaust pipe, use it to detect the oxygen content in exhaust port. Oxygen sensor and thus can be obtained in accordance with the signal, put it back to the control system to fine-tune the fuel injection, so that A / F control at best, not only greatly reduces emissions and save
3、s energy. At present, the practical application of the oxygen sensor has zirconia dioxide oxygen sensors and the two oxygen sensors. And common oxygen sensor and a single lead, double-lead and lead of three points； single pin for Zirconia oxygen sensor； double lead for the titanium dioxide oxygen se
4、nsor； three-lead type for the heating oxygen zirconia sensors, in principle, lead the way on three of the oxygen sensor is not a substitute for use. Are one of the most widely used type of zirconia oxygen sensor. First, zirconia oxygen sensor structure In the use of three-way catalytic converters to
5、 reduce exhaust pollution on the engine, oxygen sensors are essential components. Oxygen sensor is located in the first section of the exhaust pipe, catalytic converter at the front. There is a Oxygen Sensor zirconia (a ceramic) components manufacturers, all of its outside has a layer of thin-plated
6、 platinum. Zirconia ceramic plated body at one end with a thin layer of platinum closed. Into the protection of the latter was set, and installed in a metal body. Further protect the protection of the role of sets played and sensor can be installed on the exhaust manifold. Ceramic exhaust external e
7、xposure, and the internal atmosphere and the environment the same. This component has a very high temperature resistance, low temperature so do not allow current through. However, when high temperature, because of the air and exhaust gas oxygen concentration difference, oxygen ions can, through this
8、 component. This raises the potential difference, platinum to enlarge. In this way, air-fuel ratio lower than the theoretical air-fuel ratio (thick), the components in the oxygen sensor in (air) outside (the atmosphere) between the oxygen concentration has a greater bad. Thus, the sensors have a rel
9、atively strong one voltage (Johnson V). On the other hand, if the rare gas mixture, air and exhaust gas oxygen concentration difference between the very small, have a sensor, there is only one relatively weak voltage (near 0 volts). Because once the mixture of air-fuel ratio deviation from the theor
10、etical air-fuel ratio, ternary catalysts for CO, HC and NOX purification capacity will be a sharp decline, it is installed at the exhaust pipe oxygen sensor for detecting oxygen concentration in the exhaust, and ECU the issue of feedback signal, and then by the 2 ECU to control fuel injection amount
11、 of injector change, which will control the mixture at the air-fuel ratio near the theoretical value. Two, automotive oxygen sensor working principle Oxygen sensor installed in the exhaust manifold, it can detect the concentration of oxygen in the exhaust, air-fuel ratio calculated, and the results
12、sent to the ECU. For example: 1, exhaust gas oxygen concentration in the high When emissions are significant when the percentage of oxygen, ECU will accordingly determine the air-fuel ratio, and that is very dilute mixture. 2, exhaust gas oxygen concentration in the low When the percentage of oxygen
13、 in the exhaust very, ECU to determine air-fuel ratio will accordingly small, that is very strong mixture. Temperature higher than 300 , the ceramic materials used for the iron conductor. Under these conditions, if the percentage of oxygen sensors on both sides of the different content will have a v
14、oltage change at both ends. Two types of environment (air-side and exhaust side) of the different measurements of the oxygen content of these changes tell ECU, exhaust at the oxygen content in the remainder of the generation of harmful emissions to ensure that combustion is not appropriate percentag
15、e. Ceramic materials at temperatures lower than 300 are non-linear, and thus the sensor is not a useful signal transmission. ECU has a special function, that is, heating machine at pm (open-loop operation) to stop the adjustment of the mixture. Sensors equipped with heating elements to reach operati
16、ng temperature quickly. When current flows through the heating elements, it reduces the iron to make ceramics become conductors of time, and which makes the sensor can be installed in the exhaust pipe of the site later. In the three-way catalytic purifier Medium, ECU using data from the oxygen senso
17、r to regulate the air-fuel ratio, but the method of standard Carburetor EFI device somewhat different. At EFI device, EFIs ECU fuel injection through the increase or decrease from the injected fuel volume, adjusting air-fuel ratio. If the ECU from the oxygen sensor detects the mixture too thick, it
18、will gradually reduce the amount of fuel injection, the mixture of on-thinning. Therefore the actual air-fuel ratio becomes greater than the theoretical air-fuel ratio (more dilute). When this happens, ECU through the oxygen sensor to detect the truth, it will start a gradual increase in the volume
19、of spray. In this way, air-fuel ratio is too low, some will Luan (more dense) until the air-fuel ratio lower than the theoretical. Thus, the cycle repeated, ECU main cloud in this way, constant changes in air-fuel ratio, the actual air-fuel ratio near the theoretical air-fuel ratio. Carburetor in th
20、e use of the device, are entered by regulating air intake air-fuel ratio of air-conditioning. Mixture theory is usually air-fuel ratio to maintain a little thick. ECU within the air-fuel ratio oxygen sensor has been the information, and manipulation, according to the actual air-fuel ratio EBCU (elec
21、tronically controlled intake valve) regulator into the carburetor air intake volume. If mixture is too strong, it allows more air to enter to-thinning: If mixture is too thin, it allows less air to enter, 3 so that more Third, the common automotive oxygen sensor fault Once the oxygen sensor fails, t
22、he electronic fuel injection system will enable the computer should not be the oxygen concentration in the exhaust pipe of the information, and therefore should not be on the air-fuel ratio feedback control, the engine will increase fuel consumption and exhaust pollution, engine idle speed instabili
23、ty, lack of fire, such as fault-surge situation. Therefore, it is necessary to troubleshoot in a timely manner or replaced. 1, oxygen sensor poisoning Oxygen sensor poisoning and are often more difficult to control emerging as a fault, in particular, are often the use of leaded petrol cars, even the
24、 new oxygen sensor, and can only be the work of thousands of kilometers. If only minor lead poisoning, and then use a box of unleaded petrol, will be able to eliminate the surface of oxygen sensor lead to the resumption of normal work. But often because of excessive exhaust temperature, which lead i
25、ntrusion in their internal and impede the spread of oxygen ions to oxygen sensor failure can only be replaced at this time. In addition, the oxygen sensor silicon poisoning happened is common. In general, gasoline and lubricants containing silicon compounds generated by combustion silica, silicon ru
26、bber seal gasket improper use of silicone emitting gas, will cause the oxygen sensor failure, and therefore want to use good quality fuel and lubricants .Right to choose the repair and installation of rubber gaskets, coated on the sensor not to require the use of factory and other than the anti-solv
27、ent, etc. 2, carbon deposition Not because of engine combustion, in the carbon deposition formed on the surface of oxygen sensor, oxygen sensor or the internal into the sediment, such as oil or dust will impede or block the external air into the oxygen sensor internal to oxygen sensor signal output
28、inaccurate, ECU should not timely correct air-fuel ratio. Soot produced, mainly for increased fuel consumption, emission levels were significantly increased. At this point, if the sediment removal will restore normal working. 3, oxygen sensor ceramic fragments Ceramic oxygen sensor hardware and cris
29、p, with a hard object by knocking or washing with a strong air currents blowing all its fragmentation and possible failure. Therefore, be particularly careful when handling and found that the timely replacement of problem. 4, heater resistance wire blown The heating-type oxygen sensor, if the resist
30、ance heater wire ablation, it is difficult to make sensors to reach normal operating temperature and the loss of role. 5, oxygen sensor breaking off the internal circuits. Four, automotive oxygen sensor method 1, oxygen sensor heater resistance check Unplug the oxygen sensor wiring harness plug, use a multimeter resistance measurement file in the oxygen sensor heater terminal access-chu-chu with Ground between access resistance and its resistance to 4-40 (refer to specific model
