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Strigear

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Why so efficient

Strigear is very efficient because

• Much power goes to the tires mechanically
• The engine average efficiency is very high
• The losses from engine to tire are very low

Much power goes to the tires mechanically

The Strigear IC engine can be engaged directly when high power is required and disconnected equally fast when the power demand goes down. In cycles like the NEDC, some 60-80% of the energy from the engine reaches the tires through mechanical means. In mainstream hybrids, much engine power goes through two electric motors and inverters, which gives higher losses.

The engine average efficiency is very high

During normal driving and in test cycles like the NEDC, the torque required from the IC engine is often so low that the engine would have a low efficiency if only supplying the torque required to run the vehicle. The electric motor on the engine fly-wheel can load the engine with an extra torque that lifts the engine torque to a level that has a much better ICE efficiency, and it can do so without disturbing the passengers. The extra load is used to charge the battery. This permits a very high average IC engine efficiency. Simulations of different engines, vehicles and driving cycles show that the average engine efficiency is 94-96 % of the peak efficiency of the IC engine.

The losses from engine to tire are very low

There are only two moving cog wheel pairs that carry torque. Direct transfer efficiency from the engine to tire is therefore some 94.5%.