2 mode power train :Speed to time graph and modes.

2 mode powertrain, The  previous post shows mild hybrid and diagram . It gives a clear idea on differnce on mild hybrid and 2 mode hybrids (click on the pic to see it in detail )

The Two-Mode hybrid system maximizes city and highway fuel economy by integrating two electric continuously variable modes with four fixed mechanical gear ratios. The system consists of twin, active-cooled electric motors integrated into the automatic transmission. Energy to power the motors comes from a 300V nickel-metal hydride battery pack, which consists of nickel metal hydride modules and is packaged behind the second-row seat below the cargo floor.

In the first mode, at lower speed and lighter loads the 2-Mode Hybrid operates in one of three ways depending on conditions and battery charge level: all-electric power, internal combustion engine power or a combination of the two. All reverse operation is driven solely by the electric motors.

The second mode is used primarily to optimize fuel economy at highway speeds. It provides electric assist in addition to combustion engine power when conditions demand it, such as trailer towing and climbing steep grades, and to allow the engine to run at its most efficient point under less-demanding conditions.

No engine speed changes are necessary for the mode shift to occur. The result is exceptionally smooth, seamless acceleration and responsiveness. At all times, the Hybrid Optimizing System (HOS) collects torque-based data, deciphers it, then determines the most fuel-efficient means of propelling the 2-Mode Hybrid.

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