The Japanese Auto-Giant, Toyota is prominent for their innovation and new technologies. Now to maintain their tradition, they have developed a totally new platform for engines and transmissions and christened it as “Toyota New Global Architecture”. TNGA is developed to provide the safest and smoothest drive with unmatchable fuel-efficiency. Not only for petrol vehicles, but this will also reinforce hybrid vehicles. With this the Toyota designers got the liberty to design the car in a completely unique way. With the help of TNGA, designers can craft the vehicles in a very low-stance structure, which will provide better stability and handling. Also, these vehicles will shred some kilos, directly affecting fuel-efficiency.
Pursuant to Toyota, they will bring 17 versions of nine new power-mills and 10 versions of four transmissions from 2017 to 2021. The main motto of rendering these new engines is to get 10% better engine performance, 20% more fuel economy, better fuel combustion and enhanced air intake efficiency.
Now focusing on these new engines, we all know, the average thermal efficiency of any petrol engine is around 25% (though, peak thermal efficiency is around 36.8% theoretically). In TNGA, the engine capacity starts from a 2.5-liter four cylinder petrol mill and the thermal efficiency of the engine is 40%, which is a lot higher than normal engines. The same engine will provide 41% of thermal efficiency when it is used in a hybrid system. Now everybody will have a question – “Why is this so high?” The reason behind this is – the engine uses wider valves which help for better intake and exhaust. Moreover, it runs on a 13:1 compression ratio which is 40-50% more than normal petrol engines and a 14:1 compression ratio for hybrid vehicles.
The other elements they have used in their engines are high-energy ignition coils, multi-hold direct injectors, coated pistons and cylinder bore. All of these will help for smoother operation and lesser frictional losses. The company is aiming for a 60% reduction in emissions. So it is obvious that it will provide a better fuel efficiency.
To be paired with the new TNGA engines, Toyota has also developed new transmissions, which come in two forms – 8-speed and 10-speed automatic transmissions. If the company has made such an efficient engine, it is a fundamental to produce a high-end transmission to pair with, for the job to be done perfectly. The new transmissions come with upgrades like improved gear teeth surfaces and clutch materials, which will reduce frictional losses and give smoother shifting. By this, the clutch torque is reduced by almost 50% compared to any conventional 6-speed automatic gearbox. Yet, the unit is very light and compact, which means the designers didn’t make any compromises.
Apart from the petrol engines and their transmissions, THS-II (Toyota Hybrid System – II) is also a part of TNGA. THS-II is ready to bring an evolution in current hybrid-electrical systems with both, a transverse and a rear-wheel drive transmission fitted with an electric motor. In this system, there is one electric motor assisting as a generator and another for the drivetrain. The system combines a new, smaller and lighter Power Control Unit (PCU), which diminishes the electrical losses by 10%. A major advantage of this system is that it is mounted directly above the transaxle, saving a lot of space.
So these are some fundamentals of the New Global Architecture. Toyota hasn’t yet unveiled the name of the first car which will be based on the TNGA platform, but Toyota says that the improved vehicles will be rolling out in 2017.