Valentin Technologies, Inc. develops hybrid-hydraulic engine systems featuring a free-piston engine, high-pressure accumulator, and wheel motors—delivering ultra-efficient, regenerative, low-emission drivetrains for commercial and light-duty vehicle applications.

1. Hybrid hydraulic vehicle concept platforms (INGOCAR): Their INGOCAR concept embodies a full vehicle integration of hydraulic hybrid systems (small internal charging engine, accumulator, wheel motors, active bumpers) to demonstrate packaging and performance. 
2. Hydrostatic drivetrain design & licensing: Valentin offers advanced hydrostatic drivetrain architectures combining hydraulic free-piston charging engines, high-pressure accumulators, and variable-displacement wheel-motors; they may license this core intellectual property to OEMs. (Based on their homepage claims of “advanced hydrostatic drivetrain” and 1.23L/100km performance) 

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Company Resources
Web Links - Valentine Technologies Truck & Bus