The diesel engine with a maximum thermal efficiency of 44%, which is considered to be the highest in the world for a diesel engine of a mass-produced vehicle
[Click to enlarge image]
The variable-geometry turbocharger. Its efficiency was improved while its size was reduced.
[Click to enlarge image]

Toyota Industries Corp exhibited a high-efficiency 2.8L direct-injection turbo engine at the 44th Tokyo Motor Show 2015, which runs from Oct 29 to Nov 8, 2015.

The engine, "1GD-FTV," was developed by Toyota Motor Corp and is produced by Toyota Industries. The maximum thermal efficiency of the engine was increased to 44% by making improvements such as high-thermal-insulation diesel combustion. The efficiency is considered to be the highest in the world. The engine was employed for the "Land Cruiser Prado" four-wheel-drive, "Hilux" compact pickup, etc.

To improve thermal efficiency, Toyota used "TSWIN (Thermo Swing Wall Insulation Technology)," which reduces cooling loss at the time of combustion. The head of the piston is coated with a silica-reinforced porous anodized film, which can be easily heated and cooled.

While the amount of heat that is transferred from the piston to the cylinder block and, then, to the cooling water at the time of combustion was reduced, the speed of heat radiation in the air-intake process was increased. As a result, the cooling loss at the time of combustion was reduced by up to about 30%.