dieselsähköinen

Dieselsähköinen refers to a type of locomotive or railcar that uses a diesel engine to generate electricity, which then powers electric motors that drive the wheels. This design combines the advantages of diesel engines, such as their ability to operate independently of an overhead power supply, with the efficiency and performance of electric traction.

In a dieselsähköinen system, a diesel engine is directly coupled to a generator. This generator produces direct current (DC) or alternating current (AC) electricity. The generated electricity is then supplied to traction motors, which are typically electric motors, to provide propulsion. Control systems manage the power output from the diesel engine and the flow of electricity to the traction motors, allowing for precise speed control and acceleration.

This configuration is distinct from diesel-hydraulic locomotives, where the diesel engine's power is transmitted to the wheels through a hydraulic transmission system. Dieselsähköinen locomotives offer good torque at low speeds, making them suitable for heavy hauling and shunting operations. They are widely used in various railway applications, including freight, passenger, and mixed traffic services, particularly in regions where electrification is not widespread or economically feasible. The technology has evolved over time, with modern dieselsähköinen systems incorporating advanced emission control technologies and improved fuel efficiency.