 VNT™ Turbochargers Honeywell’s introduction of VNT™ turbochargers was a key industry breakthrough of the 1990s, making it easier for car manufacturers to fully deploy the torque and fuel economy advantages of direct injection diesel engines. The system involves the use of a turbine housing that can change its internal configuration to adapt to variations in the engine’s air boost requirements. VNT™ technology enables the turbocharger to supply greater engine boost at lower speeds than a smaller unit, yet match the performance of a larger turbo at higher speeds. VNT™ turbochargers also help to control the emission of NOx from diesel powered vehicles by introducing Exhaust Gas Recirculation into the engine.
Third Generation VNT™This new “platform” spawned several high performance innovations – a new vane shape, a new generation turbine wheel and better controllability – all combining to deliver 130% of second generation VNT™ boos levels at just 90% of back pressure. The new VNT™ “cartridge” has been developed specifically to meet the customer’s needs for smaller, cleaner and better performing engines. In addition, because the VNT™ “cartridge” doesn’t use the turbine housing as a mechanism holder, this housing can be more readily made out of sheet metal. Two Stage TurbochargingDual-stage technology is being applied to passenger cars, both in serial-sequential and parallel-sequential configurations. In a serial sequential system, a smaller high pressure turbo works in advance of a much larger turbo, while in a parallel sequential arrangement, two small turbos work side-by-side. In a typical 4 cylinder application, a parallel-sequential system creates up to 30 percent more torque compared to its 2.2 liter baseline diesel counterpart, delivers better fuel consumption and exhibits 20 percent improved acceleration in the 30kph-60kph range. Typical fuel consumption improvement ranges between 5-7 percent. Advanced Compressor Technology with Ball BearingVariable-geometry compressor technologies (VGC) enable the compressor to run at flow rates and pressure rations simply not possible with conventional compressor technology. The net result is an engine that produces more torque at lower speed and more power at high speed. VGC also incorporates ball bearing technology, which dramatically reduces friction losses in the bearing system, improves fuel consumption and transient performance, enhances Exhaust Gas Recirculation (EGR) and, critically, converts more energy into aerodynamic power. This leads to better NOx control. These developments will improve fuel economy by 2-4 percent over current diesel boosting technology Micro TurboHoneywell is developing micro turbo technologies ideally matched to the needs of the small car segment in emerging markets. These turbo systems will make small 2 or 3 cylinder diesel engines more “driveable” and will offer around 25-20 percent improved fuel economy over alternative gasoline engines. REAThe electronic control of diesel fuel injection in recent years precipitated the need for the electronic control of air. Working in conjunction with Garrett® VNT™ turbochargers, the Garrett® REA provides this control in both steady state and transient mode by knowing and controlling the vane position. It communicates with EMU (Engine Management Unit) in either PWM or CAN form (option), receiving and carrying out instructions instantaneously. The Garrett® REA also provides faster response compared to a conventional pneumatic vacuum system. Additionally, with fewer vehicles in the future requiring vacuum systems, the Garrett® REA liberates the turbo from its dependence on such systems. | 
