Toyota Camry Hybrid utilizes a Hybrid Synergy Drive (HSD) functioning as a battery pack that serves as an energy reservoir. It uses power from the battery pack to propel the vehicle at startup, low speeds or under acceleration. When higher speeds, faster acceleration or more power for charging the batteries are needed, the gasoline engine is started by the motor-generator.

These features allow the gasoline engine to be turned off during traffic stops, with accessory power (including air conditioning) being provided by the battery pack. During deceleration, this car uses the forward motion of the vehicle to produce a significant amount of charging current to the batteries. This way the power needed for acceleration is stored as electrical energy that was converted from the forward momentum.  

Camry uses a 650V electric motor in conjunction with a four-cylinder gasoline engine for an estimated fuel economy of 33/34 MPG. (read more)

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The BlueTec system was created because the processes that give diesel engines efficient fuel economy also creates extra emissions of certain pollutants. High compression ratios and lean air-fuel mixtures make high combustion temperatures, which results in more nitrogen oxides and Diesel Particulate Matter (also known as soot) being released into the atmosphere. While the particulate matter can be controlled with higher injection pressures and particulate filters, the big challenge is limiting NOx.

Consisting of many different elements, BlueTec most notably relies upon particulate traps to eliminate soot/smoke throughout the engine's operating range, and upon urea injection from a stored canister (Mercedes calls this AdBlue) into the exhaust stream. AdBlue injection begins a chemical chain reaction which, in conjunction with an additional catalytic converter, converts nearly all remaining NOx into water vapor and nitrogen. (read more)