Currently, Lexus is using the fourth generation of Hybrid Synergy Drive from Toyota. The Lexus RX 400h, Lexus ES 350, Toyota Camry, and Toyota Highlander are all built on the same platform with slight modifications between the sedans and the SUVs.
The gasoline-powered part of the engine system is a 3.3L 3MZ-FE V6, very similar to the one found in the RX 330. It produces 268 HP when aided by the two additional electric motors. Under normal driving conditions, only the front motor and gasoline engine will be used. The rear motor will only be used under full-throttle acceleration or when the front wheels lose traction (if so equipped). The gasoline engine will switch off automatically when the vehicle is either stationary, decelerating, or being driven at a slow speed and the electric motor will take over. A Ni-MH battery is responsible for powering the motors, and it is charged during deceleration and from the heat energy caused from braking.
