Abstract
A reliable, long-life, and low-cost cylinder pressure sensor is the enabling element of advanced control systems that have potential for significant fuel economy improvements, reduced levels of combustion pollutants, and improved engine reliability and performance. Optrand has developed high-temperature, long-life, and miniature fiber optic pressure sensors suitable for integration into higher-functionality devices such as smart ignition systems, fuel injectors, or glow plugs. The design and performance of integrated Optrand sensors are reported for gasoline, diesel, and natural gas engines demonstrating a total error due to non-linearity, hysteresis, and thermal shock below +/-1% and the lifetime of 500 Million pressure cycles.