IC engine with two turbocharger units - has one unit switched off at low load, with excess exhaust fed to this unit at medium speed

摘要

The piston IC engine comprises at least two exhaust driven turbo-chargers which operate in parallel at high engine load while at low to medium load at least one has its exhaust supply stopped and its output disconnected. At medium to high load the excess exhaust not required by the continuously operating charger is fed to the other charger via a variable throttle and the air output fed to the compressor input of the charger to produce pre-whirl. When the chargers reach equal speed the connections are fully restored.