15 August, 2016

 

 

Headlines

  • World’s first: As the world’s first production-ready variable compression ratio engine
  • Performance and efficiency: The VC-T engine combines the power of a high-performance 2.0-litre turbo gasoline engine with the torque and efficiency of an advanced turbodiesel – without the equivalent emissions
  • Revolutionary technology: INFINITI’s VC-T establishes new benchmarks for the internal combustion engine; a new breed of engine which can transform on demand

 

Overview

INFINITI’s all-new 2.0-litre VC-T (Variable Compression-Turbo) gasoline engine is the world’s first production-ready variable compression ratio engine and the most advanced internal combustion engine ever created.

 

INFINITI’s VC-T technology uses an advanced multi-link system to seamlessly raise or lower the height the pistons reach, transforming the compression ratio on demand. The engine is able to offer any compression ratio between 8:1 (for high performance) and 14:1 (for high efficiency). The result is an engine that combines the power of a high-performance 2.0-litre turbo gasoline engine with the torque and efficiency of an advanced turbodiesel – without the equivalent emissions. The VC-T engine will be comparable to certain six-cylinder gasoline powertrains for performance, while significantly outperforming them in efficiency.

 

The VC-T engine also achieves lower levels of noise, vibration, and harshness than conventional internal combustion engines, particularly diesel, and is lighter and more compact than units with comparable power outputs.

 

For decades, vehicle engineers around the world have believed that the ultimate breakthrough in internal combustion technology would come from mastering the variable compression ratio. INFINITI is the first to bring this technology to the mass market and has patented more than 300 new technologies specifically for application in the new VC-T engine.

INFINITI’s VC-T technology marks a significant leap forward for the internal combustion engine, joining other renowned powertrain innovations such as liquid-cooling, fuel injection and turbocharging. The arrival of variable compression ratio technology will establish new benchmarks.

 

The VC-T engine will be available in new INFINITI models during 2018.

Proof points

  • Other manufacturers have taken on the ‘VCR’ challenge, though INFINITI will be the first to bring the variable compression ratio engine to market.
  • The world’s first engine to transform its efficiency and response on demand
  • The first VC-T engine will be available from 2018
  • INFINITI has worked on this technology for more than 20 years
  • INFINITI invented a new multi-link technology in 1998, which is key to a true variable compression ratio that can range anywhere between 8:1 and 14:1 (i.e. not simply either/or)
  • Lower compression ratios avoid the premature combustion of the air-fuel mixture in the cylinder and offer greater power and torque, particularly in turbocharged engines
  • INFINITI’s revolutionary new VC-T engine is able to vary its compression ratio by actively raising or lowering the height the pistons reach with an innovative multi-link system
  • A variable compression ratio offers both power and efficiency within the same engine
  • The VC-T engine is able to offer any compression ratio between 8:1 for high performance and 14:1 for high efficiency
  • INFINITI’s new VC-T engine makes an intelligent choice between performance and efficiency in all conditions, responding to driver demand –empowering them with the engine they want, when they want it
  • The engine moves seamlessly between compression ratios– sensors detect the car’s driving condition and uses these inputs to instantly select the most suitable compression ratio
  • Under hard acceleration or heavier engine loads – such as driving up a hill – the engine switches to a lower compression ratio, resulting in higher performance
  • Under steady or slowing driving conditions, at idle and low speeds in stop-start traffic, the engine defaults to a 14:1 ratio for maximum efficiency
  • INFINITI has patented more than 300 new technologies specifically designed for application in the new VC-T engine
    • INFINITI has created a ‘Harmonic Drive’, driving a control arm
    • As the Harmonic Drive actuator rotates the control shaft at the base of the engine also rotates
    • As the control shaft rotates, it moves the multi-link within the engine
    • Changing the multi-link angle adjusts the top-dead-centre of the pistons and, so, the compression ratio
    • The engine uses individual cylinder ignition timing control and valve timing for high-precision control over combustion characteristics
    • Electronic valve timing control is used for the fuel intake valves, contributing to more responsive acceleration, and enabling greater fuel economy under Atkinson cycle combustion conditions; the exhaust valves rely on conventional hydraulic valve timing control
    • The VC-T employs multi-point injection (MPI) and direct injection (GDI), balancing of efficiency and power in all driving conditions
    • An integrated exhaust manifold is built into the cylinder head to improve packaging, performance and efficiency
    • The VC-T employs an electronically-controlled wastegate actuator to maintain turbocharger boost pressure
    • VC-T engine employs INFINITI’s low-friction ‘mirror bore coating’ technology to reduce friction
  • The VC-T engine is able to switch between both Atkinson and regular combustion cycles without interruption. Each cycle enables greater combustion efficiency and optimal engine performance as the combustion ratio transforms
  • VC-T is a smooth-running in-line four-cylinder engine, due to the minimal lateral stroke forces from the pistons on the cylinder walls, the VC-T engine requires no balance shafts at the base of the engine. Conventional four-cylinder engines require two to minimize vibrations
  • The VC-T engine’s intrinsic smoothness gives it similar NVH characteristics to a traditional V6 engine