Improved 1.8 Litre Hybrid Powertrain
The fourth generation 1.8 litre self-charging hybrid system develops 90 kW/122 hp and 142 Nm of engine torque, with the added power of a 53 kW electric motor which develops maximum torque of 163 Nm from zero rpm. It fulfils all the requirements that customers have come to expect from a Toyota self-charging hybrid powertrain -quiet, intuitive, responsive and self-sufficient EV technology with no need for plug-in recharging. It offers low cost of ownership, outstanding fuel economy and low CO2emissions, and up to 50%* all-electric driving on the everyday commute.
Its size and weight reduced to fit on the new GA-C platform without detriment to output or quietness, the 1.8 litre engine benefits from several friction reducing measures, a larger capacity EGR (Exhaust Gas Recirculation) system and optimal heat management.
The calibration of the hybrid drive system has been further refined. Greater torque from the electric motor provides a more linear rpm increase under acceleration. And the adoption of a lithium-ion battery pack promotes even greater fuel economy.
2.0 Litre Hybrid Powertrain
‘At the start of the project, we studied European customer profiles and their satisfaction with the 1.8 litre hybrid powertrain. Whilst being very happy with the system’s fuel consumption, comfort, smoothness and reliability, it became apparent that we would not be able to satisfy the requirements of a significant group of potential customers.
People driving turbocharged powertrains above 1.4 litres were clearly asking for faster acceleration and response, and that’s why we took the decision to develop the 2.0 litre hybrid for the European market.’(Rembert Serrus, Senior Manager Performance Planning – Toyota Motor Europe)
The new 2.0 litre system develops 132 kW/180 hp and 192 Nm of engine torque, also with the added torque of a nickel-metal hydride-powered electric motor.
Taking full advantage of the added stability, handling and agility inherent in the newly adopted GA-C platform, it offers drivers an ‘energised drive’, with more power, a Sport mode and a six-speed Sequential Shiftmatic transmission with steering wheel-mounted paddles for a more dynamic, engaging driving experience.
Moreover, the new 2.0 litre hybrid system is a unique proposition in this segment; no other conventional powertrain can offer the same combination of performance and low emissions. And numerous measures have been taken to ensure that extra power is matched by enhanced fuel efficiency, lower emissions and even quieter running.
A high compression ratio of 14:1, the high speed combustion achieved through the high tumble flow of a highly efficient intake port and long stroke, a new oil pump design and several friction-reducing measures combine with a reduction in size of the transaxle, power control unit, motor and hybrid battery to enhance fuel efficiency.
In addition, the EV drive vehicle maximum speed has been increased to above 115 km/h, and system control has been changed to prohibit engine start without accelerator pedal operation even before engine warm up starts. In combination, these measures substantially enhance fuel efficiency.
Lowering emissions, the exhaust system catalytic converter has been placed closer to the engine, and warm-up control after engine start optimised to achieve early, enhanced exhaust purification.
Furthermore, a balance shaft, amended engine mount position and shape, structural changes to the transaxle, gear tooth polishing, the adoption of a positive/negative hysterisis damper, a lightweight timing chain and revisions to the water pump motor all combine to reduce powertrain noise to exceptionally low levels.