Patent ID: 9739213
Date: 2017-08-22
CPC Classifications: F02B,F02D,F02M,Y02T

Claim:
1. A method for a turbocharged engine, comprising: powering the engine using a first operating cylinder with a first valve overlap, supplementing the power using a second switchable cylinder, the second switchable cylinder switched based on load and providing a partial deactivation, the second switchable cylinder being deactivated responsive to a load below a first threshold and activated responsive to the load exceeding the first threshold, closing a shut-off valve downstream of a compressor during the partial deactivation; opening a second shut-off valve in a bypass line during the partial deactivation; increasing valve overlap of the first operating cylinder relative to the first valve overlap to scavenge out residual gas therein; actuating an inlet valve of the first operating cylinder to provide a valve lift before top dead center during charge exchange, wherein an exhaust gas is recirculated externally during operations; and reducing the valve overlap of the first operating cylinder relative to the first valve overlap during the partial deactivation responsive to the load falling below a second threshold that is lower than the first threshold.