Toyota implements next-generation thermal insulation technology in new turbodiesel engines

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Toyota’s new 2.8-liter D-4D turbodiesel engine (which will appear in the Land Cruiser this summer) represents the first fruits of advanced new design and technology to achieve higher fuel efficiency, lower emissions and quieter operation. The engine (1GD-FTV) is the first in the world to benefit from Thermo Swing Wall Insulation Technology, making it one of the most thermally efficient on the market – its thermal efficiency rating is 44%.

Although it is smaller than the 3-liter engine it is replacing, it offers 25% more torque. Usefully, there is 11% more torque available at low revs, and customers will appreciate a 15% improvement in fuel economy.

As well as appearing in Land Cruiser in the UK, the engine is powering new Far Eastern market versions of Hilux. The same engine group will also feature a new 2.4-liter direct injection turbodiesel (2GD-FTV).

In testing, the new engines have proven their high thermal efficiency, quiet operation and powerful performance in worldwide locations, including extremely cold environments, where temperatures can fall to -40°C, and at high altitudes above 4,500m.

Toyota has also been able to make the engine catalyst 30% smaller and has reduced the number of exhaust layouts from 18 to just three, simplifying the engines’ deployment worldwide and reducing the environmental burden.

Key to the performance of the new engines is the world-first application of Thermo Swing Wall Insulation Technology, together with a SiRPA (a silica-reinforced porous, anodized aluminum coating) on the pistons – reducing the cooling loss during combustion by about 30%.

SiRPA’s high insulation and dissipation qualities make it easy to heat and to cool. The air intake port has been shaped to allow a significant increase in the amount of airflow into the cylinders; the piston combustion chamber shape has been revised; and the common-rail fuel injection system allows for more advanced pressure control and injection optimization. Air consumption is maximized, which enables high thermal efficiency and low emissions to be achieved.

Precise pilot injection, matching the state of the ambient air, takes place ahead of the main injection to shorten ignition delay. This means stable combustion is achieved, even in harsh environments, together with quiet running and high thermal efficiency.

The GD engines use a new turbocharger that is 30% smaller than its predecessor.

Produced in-house by Toyota, it has a new turbine that improves efficiency and a new impeller that gives instantaneous throttle response and allows maximum torque to be obtained over wide engine rev range.

Using Toyota’s proprietary, compact, high-dispersion urea selective catalyst reduction system eliminates up to 99% of NOx emissions, one of the principal causes of air pollution. This helps the engine conform to Euro 6 and other international emissions standards.

The current KD family of engines will be phased out gradually and replaced with the new GD units, By 2016, production will reach about 700,000 units a year, available in around 90 world markets. Toyota aims to increase this number to at least 150 by 2020.

Toyota will continue to position diesel engines as a key component in its engine line-up, true to the philosophy of providing the right vehicles for the right places, at the right time. The entire Toyota group, including Toyota Industries Corporation, will combine its energies to develop cleaner and more competitive diesel engines for a wide range of vehicle types, taking into account the varying needs of people around the world.

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About Author

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Dean has been with UKi Media & Events for over a decade, having previously cut his journalistic teeth writing and editing for various automotive and engineering titles. He combines extensive knowledge of all things automotive with a passion for driving, and experience testing countless new vehicles, engines and technologies around the world. As well as his role as editor-in-chief across a range of UKi's media titles, he is also co-chair of the judging panel of the International Engine of the Year Awards.

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