The Kalmar hydraulic hybrid drive terminal tractor is equipped with a parallel system that simultaneously transmits power from two sources – the primary diesel engine and the secondary hydraulic motor. The coordination of these power sources is said to “maximise fuel economy and satisfy performance constraints”.
While the manufacturer concedes that fuel consumption can vary depending on driving style and the operational application, in the typical port environment, it claims fuel savings of 20%.
No stranger to environmental improvements, Cargotec was the industry’s first to offer straddle carriers and later shuttle carriers with hybrid drive systems.