MEASUREMENT OF THE DETERIORATION OF THE DIESEL ENGINE OIL USING THE IDT CAPACITOR SENSOR

A capacitor-type engine oil sensor is designed and fabricated to measure the property of diesel depending on vehicle mileage. This has flat structure with interdigitated (IDT) electrodes for smooth flow constructed using printed circuit board (PCB) fabrication convenience. For increased capacitance, smaller spacing between preferred determined 0.5 mm based limit. The device applied actual trucks engine. From experiment, capacitance initially constant then upto approximately 6,000 km. And then, output dramatically decreased, which indicates that been degraded should be replaced. interval at reduction in occurs varies each vehicle, means exchange different from other. degree deterioration also measured viscosity tests total acid number (TAN) tests, results are compatible measurement capacitance. these results, it confirmed IDT capacitor can conditions