TDI

TDI is an acronym that can refer to several different concepts depending on the context. This article summarizes three widely recognized meanings in automotive engineering, imaging technology, and public administration.

Turbocharged Direct Injection, abbreviated TDI, is a diesel engine technology developed by the Volkswagen Group. It combines turbocharged air intake with direct fuel injection into the combustion chamber to improve efficiency and torque. Early systems used unit injectors, while later designs shifted to common-rail injection. TDI engines are noted for strong mid-range torque and fuel economy, and have been used in many models from VW, Audi, Skoda, and Seat. Emissions regulations and past regulatory scrutiny have influenced engine design and aftertreatment systems in these platforms.

Time Delay Integration refers to a class of imaging sensors, especially CCDs, that increase sensitivity by synchronizing image transfer with motion. During exposure, charge is shifted along the array in the same direction as the scene moves, effectively extending the exposure without blurring. This technique is used in aerial and satellite imaging, line-scan cameras, and some medical imaging applications, where high sensitivity and fast readout are important.

Texas Department of Insurance is a state agency in the United States responsible for regulating the insurance market in Texas. Its duties include licensing insurers and agents, reviewing rate and form filings, investigating consumer complaints, and enforcing state insurance laws. The department also provides consumer information and pursues market conduct oversight.

Other uses exist in different regions and fields, but these three meanings are among the most common. Context is important to determine which TDI is being referenced.