ENGIRO is devoting even greater effort toward developing parallel hybrids for rail transportation, as the hybridization of drives in local mass transport offers extremely interesting perspectives for the future. The driving cycle of such rail systems, with relatively many starts and stops and their heavy mass compared to road vehicles, offers much greater energy-saving potential compared to conventional drives thanks to energy recovery and boost functions.
Support from integrated electrical machines also makes it possible to trim the engine map of diesel drives in the consumption-optimized range and provide advantageous coverage when shifting. Depending on the constellation, it even becomes possible to downsize the diesel engine, as it no longer needs to be designed for peak loads but only for the lower and middle ranges, with the electrical machine covering the brief peaks. This technology also enables purely electronic operation in protected zones and virtually silent acceleration when departing the station or stop.
The broad implementation of hybrid drives also means that all auxiliary systems such as pumps, fan, air-conditioning compressor, etc., which were previously powered mechanically or hydraulically, can now run electrically, and thus only when needed.
In designing our electric motors, we use primarily permanent magnet-excited synchronous machines (PM machines). These are convincing not only on account of their compact design and power density but also their high efficiency, which makes for low operating costs.