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Strigear technology

The Strigear system consists of two electric motors, one simple gear box and a one way clutch, assembled tightly together and replacing the original gearbox unit.

Strigear has one electric motor assembled on the engine fly-wheel and the other on the input shaft of an AMT ("Automated Manual Transmission") or a SSMT ("Servo Synchronized Manual Transmission").

The engine side motor separates Strigear from other hybrid systems. It acts as an “Engine efficiency control motor”, and its primary task is to make the internal combustion engine (IC engine) run on optimal (i.e. high) torque whenever the IC engine is running. Another advantage having an engine side motor is its ability to control the speed of the engine at start and during gear shifts, as well as increase total power output during acceleration.

The gear box side motor acts as primary motor when the need for output power is limited. It is also used during acceleration and in order to control the speed of the gear box input shaft during gear shifts.

The highly disturbing long gear shift time usually found in vehicles using AMT (Automated Manual Transmission) are dramatically reduced as the two electric motors can be used as servo motors to quickly adjust the internal shaft speeds in the gear box to the values required for the forthcoming gear and to release and re-establish the tensions in the transmission required for smooth gear shifts during high accelerations.

In most cases, the engine is connected to the gear box over the one way clutch. It operates like the free-wheel in a bicycle. If the gear box has no reverse gear, it must be able to open during reverse driving.

The one way clutch is much lighter than a conventional clutch and does not require any actuator to connect it at the right time. This reduces complexity and space requirements.

The Strigear solution is even more attractive from a space and cost perspective when compared with a DCT (Dual Clutch Transmission). Such systems are supposed to become very common but require two clutches with two large actuators that must be closely synchronized.