Member Article

Smart Vibrations delivering a 37% fuel saving quietly

Magnomatics has already generated strong interest in its magnetic CVT or MAGSPLIT® system based upon substantial fuel consumption improvements and is developing systems up to 800 Nm with multinational OEMs. A recent break through suggested that the MAGSPLIT system can substantially reduce torsional vibration. As a result Magnomatics has sought and secured funding from a Smart award to develop the MAGSPLIT to the next level.

This project is focused on the development of a MAGSPLIT system and specifically seeks to demonstrate the significant drive train Noise, Vibration, and Harshness (NVH) reduction inherent in a Magnomatics magnetic transmission system. The project will validate substantial system cost savings by deleting incumbent vibration control components used in conventional drivetrains.

MAGSPLIT is an integral part of a hybrid electric vehicle and performs the function of a power-split device. These systems are becoming increasingly prevalent in hybrid vehicle drive trains, enabling the engine to operate at its maximum efficiency at any point in the drive cycle to meet the vehicle performance requirement. The MAGSPLIT system differs from existing 3-rotor power split systems (i.e. those in the Toyota and Ford product range) inasmuch as it is a 2-rotor system (input/output) with an innovative “virtual variator” function.

During the course of this development at Magnomatics, a significant breakthrough was achieved whereby the unique properties of the MAGSPLIT, and specifically the virtual variator, were used to give near 100% attenuation of torsional vibration. This was measured on a custom-made dynamometer system with a synthesised engine vibration input. This is an unusually important result for both Magnomatics and partner OEM’s, since its exploitation means that MAGSPLIT will provide significant technical (NVH reduction) and commercial benefits. This is becoming more important with the downsized internal combustion engines being used in many of todays’ hybrid vehicles.

The aim of this project is therefore to develop an engine test methodology and couple the engine operation with the MAGSPLIT and to develop the prototype control methods and calibration techniques required to maximise this benefit with a view to confirming that the DMF can be deleted and the attendant benefits realised.

This was posted in Bdaily's Members' News section by Gillian Crook .