Highly Efficient Gas/Petrol Engine

Energy-efficient, high-output gas/petrol engine

The gas/petrol engine used in HYBRID SYNERGY DRIVE is more energy-efficient, producing higher output than conventional gas/petrol engines.

The new Prius’ 1.8L 2ZR-FXE high-expansion-ratio Atkinson cycle engine replaces the former 1.5L 1NZ-FXE. The wealth of torque created by an increased displacement decreases the engine rpm during high-speed cruising. Further improvements in fuel efficiency have been achieved through the following new mechanisms.

Electric water pump
The water pump is now driven by electricity from the battery. Elimination of the drive belt decreases mechanical loss, and the flow of the coolant can be controlled even more precisely according to the vehicle’s conditions.

Exhaust heat recirculation system
This system utilizes exhaust heat – what used to go wasted – for the heater and to warm up the engine, allowing quicker heater and engine warmups.

Cool-EGR system
Flow volume of the exhaust gas is controlled carefully by the electric EGR valve and is channeled into the intake manifold, alleviating negative pressure in the manifold and decreasing pumping loss in the engine. Cooling the exhaust gas with the EGR cooler actualizes large volume EGR.

Roller rocker arm
The valve train system features roller rocker arms, decreasing friction loss in valve movements.

Specification
Maximum power output: 73kW(99PS)/5,200 rpm
Maximum torque: 142N･m(14.5kgf･m)/4,000 rpm