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Honeywell Dual-Stage Turbo Technology

Posted 09.07.2009

Two-stage turbocharging is becoming more widely adopted as automotive manufacturers seek to push the boundaries of engine performance and efficiency. Honeywell has developed boosting solutions that match two turbos in both parallel and series configurations to satisfy the fuel efficiency and power requirements of latest generation passenger cars and commercial vehicles.

Parallel Sequential Dual-Stage System
In Honeywell’s Parallel Sequential Dual-Stage configuration, two small turbos work side-by-side. The primary turbo provides boost at low engine speeds, maximizing driveability and fuel economy, while the second turbo is activated in parallel at high engine speeds to deliver best-in-class peak power. Each turbocharger is driven by one half of the engine’s exhaust energy, with the compressed air created by the turbos combined in a common intake manifold, and sent to the individual cylinders. The system can be applied to V-shaped engines and ‘inline’ applications.

See an animation of Honeywell Parallel Sequential Dual-Stage turbo technology

Series Sequential Dual-Stage System
Honeywell’s Series Sequential Dual-Stage System employs one turbocharger for lower engine speeds and a second or both turbochargers at higher engine speeds. At lower engine speeds, the primary turbocharger uses all of the engine’s exhaust energy to boost power output. Then, when a preset engine speed or boost pressure is reached, a control valve allows the full flow of exhaust gas through the secondary turbocharger, creating maximum power output within minimum turbo lag.

Matching two turbos in a series sequential system also helps to drive the extremely high boost pressures needed to optimize the benefits of Exhaust Gas Recirculation, which is a key factor in emissions control.

See an animation of Honeywell Series Sequential Dual-Stage turbo technology