Search Results

With regulations on exhaust-gas emissions becoming increasingly tight worldwide, high-accuracy exhaust-gas temperature (EGT) sensors are critical to precisely control the after-treatment systems of diesel engines. In addition, demands for longer sensor probes are growing, to enable the direct measurement of temperature at the core of the diesel particulate filter (DPF). To realize this, improved vibration resistance is required because the extension of the probe involves stronger vibration. An increasing number of turbocharged engines are expected to appear to satisfy fuel-efficiency requirements, and systems equipped with an EGT sensor will become more common for turbocharger protection. Vibration resistance is critical for an EGT sensor installed at the pre-turbocharger position because the sensor will be exposed to heavy vibration generated by the turbocharger. This study introduces a high-accuracy EGT sensor with an anti-resonance structure developed to satisfy these needs.

Spark plugs with higher ignitability are continuously in great demand to realize high fuel efficiency and low emissions. To meet this demand, DENSO launched the Iridium Spark Plug in 1997, which realized the two characteristics that had been conventionally difficult to achieve concurrently-high ignitability and long life. The development of this product was enabled by miniaturizing the center electrode, produced using DENSO's original, highly wear-resistant iridium alloy (featuring a high melting point and excellent oxidation resistance). While spark plugs are now required to have a longer service life, they are also required to be higher in ignitability, as exhaust gas regulations have been tightened recently. However, the effort to miniaturize the center electrode is reaching a limit.