ENGINE SYSTEM AND VEHICLE

摘要

Provided is an engine system in which an ECU controls an engine and a starter/generator so that an engine start operation that includes at least a reverse rotation start operation is carried out. During the reverse rotation start operation, a crankshaft is rotated in a reverse direction while an air-fuel mixture is introduced into a first cylinder, and the crankshaft is driven in the forward direction by combustion of the air-fuel mixture within the first cylinder. A decompression mechanism reduces the pressure within the first cylinder or within another cylinder so that increases in the rotational resistance of the crankshaft caused by an increase in the pressure within the first cylinder or within another cylinder are minimized during the engine start operation.