dieselmotorers

Dieselmotorer, or diesel engines, are internal combustion engines that operate on the diesel cycle. They generate power by compression-ignition: air is compressed to high temperature and pressure, and fuel is injected into the hot compressed air, self-igniting without a spark. This arrangement allows high compression ratios and typically high thermal efficiency.

Most modern diesel engines are four-stroke and use direct fuel injection, often with turbocharging and intercooling, along with electronic control to optimize fuel delivery and combustion. Two-stroke diesel engines are still used in some marine and stationary applications, offering a different balance of power-to-weight and maintenance.

Dieselmotorer are valued for high efficiency, strong torque especially at low speeds, and durability, making them common in trucks, buses, ships, heavy construction equipment, and electricity generators.

Emissions concerns have driven advances in aftertreatment, such as diesel particulate filters (DPF) and selective catalytic reduction (SCR) systems to reduce particulates and nitrogen oxides. Regulations such as Euro emissions standards and international maritime rules govern exhaust emissions.

Rudolf Diesel developed the first practical diesel engine in the late 19th century, with the first working unit demonstrated in the 1890s. Since the mid-20th century, diesel technology has expanded widely, with continuous improvements in fuel injection technology, materials, and aftertreatment.