Location History:
- Gulpen, NL (2002)
- Vaals, NL (2014 - 2017)
Company Filing History:
Years Active: 2002-2017
Title: The Innovations of Roger Graaf
Introduction
Roger Graaf is a notable inventor based in Vaals, Netherlands. He has made significant contributions to the field of electric vehicle technology, holding a total of 3 patents. His work focuses on improving the efficiency and control of electric vehicle drivetrains.
Latest Patents
One of his latest patents is a "Powertrain for electric vehicles." This invention involves a method for controlling a vehicle driveline by connecting an electric motor to each respective vehicle wheel. It determines the magnitude of demanded wheel torque from driver input and assesses the speed of each wheel. By using the demanded wheel torque and the respective wheel speed, it calculates the current power loss for each motor from a power loss map. The system then transmits power from the motor with the lowest current power loss to the respective vehicle wheel.
Another significant patent is the "Method and device for controlling the drive train of an electric vehicle." This method controls an electric vehicle drivetrain with at least two drive units, where wheels located on opposite axles are driven by respective drive units. In the first operating mode, the torque ratio provided by the drive units is set based on the efficiency applicable to each drive unit under given operating conditions. In the second operating mode, the torque ratio is set independently of the efficiency applicable to each drive unit.
Career Highlights
Roger Graaf is currently employed at Ford Global Technologies, LLC, where he continues to innovate in the electric vehicle sector. His work has been instrumental in advancing the technology that powers modern electric vehicles.
Collaborations
He has collaborated with notable coworkers such as Arnulf Sponheimer and Monika Derflinger, contributing to the development of cutting-edge technologies in the automotive industry.
Conclusion
Roger Graaf's contributions to electric vehicle technology through his patents and work at Ford Global Technologies, LLC highlight his role as a key innovator in the field. His inventions are paving the way for more efficient and effective electric vehicles.