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New Prius has most thermally efficient gasoline engine

Toyota has released technical details of its new fourth-generation Prius hybrid, with industry-leading thermally efficient IC engine

 

Toyota has released technical details of its new fourth-generation Prius hybrid, which has a 1.8-liter gasoline engine that has achieved 40% thermal efficiency – a world best, says the Japanese OEM.

The motor is largely carried over from the previous model, but the retuned 2ZR-FXE unit in the 2016 Prius has had work carried out to reduce the friction of the rotating assembly and internal parts and improve combustion. The intake and exhaust systems have also been redeveloped to be quieter than before.

A new EGR system with cooler operates even at the engine’s maximum output to enable an ideal stoichiometric air/fuel ratio across the entire powerband, says Toyota. A smaller, lighter and quieter hybrid system water pump also does its part to reduce energy consumption.

The new car uses the heat from the EGR to speed engine coolant warm-up, which allows the hybrid system to stop the engine earlier and more often in the driving cycle when it’s not needed.

The Prius will be offered with the option of both a nickel metal hydride battery and a lithium-ion unit in the Japanese and US markets, while European cars will have to settle for the NiMH battery only. The NiMH battery pack is 10% smaller and holds 28% more energy than the current unit. The Li-ion pack is smaller still, by an estimated 15%, and significantly lighter, by 7.2kg.

Fuel consumption and emissions figures have yet to be officially confirmed, but Toyota is claiming that the European-spec Prius achieves 3 liters/100km (78.4mpg) on the NEDC and 72g/km CO2 emissions.

November 24, 2015

 

24 November 2015

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