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首页> 外文会议>2000 Global Powertrain Congress on Advanced Propulsion amp; Emission Technology, Jun 6-8, 2000, Detroit, Michigan USA >Wide Range Oxygen Sensor for Improved Time-to-Activity, Frequency Response and Durability
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Wide Range Oxygen Sensor for Improved Time-to-Activity, Frequency Response and Durability

机译：宽范围氧气传感器，改善了产品的启动时间，频率响应和耐用性

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摘要

Increased demand for improved fuel economy and emissions control has necessitated the development of diffusion limited current oxygen sensors, capable of measuring exhaust air-to-fuel ratio over a wide range of exhaust conditions. Since the majority of exhaust pollutant emissions are given off during the initial 30 seconds of a gasoline engine cold start, achieving fast time-to-activity in the sensor is essential in maximizing the benefits of such a sensor in application. Traditionally, however, wide range oxygen sensors are made primarily of yttria stabilized zirconia and require regulated warm-up, through the electronic controller, to avoid thermal shock failure. A sensor was presented here which is constructed almost entirely of aluminum oxide. The electrochemical cells are fabricated as YSZ composites in the alumina substrate material, thereby minimizing the quantity of YSZ utilized. The significantly better thermal shock resistance of alumina, therefore allows for a greater temperature rise on start-up without creating a thermal shock failure in the sensor element. Time-to-activity can, therefore, be reduced for such a sensor. Thermal modeling data were presented to quantify the anticipated gains in thermal shock resistance with this sensor. This work was also implemented to optimize the temperature distribution across the element, by redesigning the heater, to further reduce stress from thermal gradients. Both modeling and test data indicate that the sensor is capable of reaching its operating temperature in approximately 8 seconds at a supply voltage of 13.5 V. Realizing this fast time-to-activity, however, requires significant thermal shock resistance of the sensor element. The modeling results presented here show that significant reductions in stress due to temperature gradients across the sensor element are anticipated by fabricating the sensor with primarily alumina instead of YSZ. Additionally, by redesigning the sensor's heater to provide better temperature distribution to the edges of the element, a further reduction in stress can be achieved.
机译：对提高燃油经济性和排放控制的需求不断增长，因此需要开发扩散限制电流氧气传感器，该传感器能够在各种排气条件下测量排气的空燃比。由于大多数废气污染物排放是在汽油发动机冷启动的最初30秒钟内释放出来的，因此在传感器中实现快速上线活动对于最大限度地提高此类传感器在应用中的效益至关重要。但是，传统上，大范围的氧气传感器主要由氧化钇稳定的氧化锆制成，并且需要通过电子控制器进行预热，以防止热冲击故障。此处介绍的传感器几乎完全由氧化铝制成。电化学电池在氧化铝基体材料中制成YSZ复合材料，从而最大限度地减少了YSZ的使用量。氧化铝具有更好的抗热震性，因此在启动时可以使温度升高更大，而不会在传感器元件中造成热震破坏。因此，可以减少这种传感器的活动时间。提出了热模型数据，以量化该传感器在抗热震性方面的预期收益。这项工作还通过重新设计加热器来优化元件上的温度分布，以进一步降低热梯度产生的应力。建模和测试数据均表明，传感器能够在13.5 V的电源电压下在约8秒内达到其工作温度。但是，要实现这种快速的启动时间，则需要传感器元件具有显着的耐热冲击性。此处显示的建模结果表明，通过主要使用氧化铝而不是YSZ来制造传感器，可以预期由于传感器元件上的温度梯度而导致的应力显着降低。另外，通过重新设计传感器的加热器，以便为元件的边缘提供更好的温度分布，可以进一步降低应力。

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