Patent ID: 8352157
Filing Date: 2013-01-08
Classification: F02D,Y02T

Abstract:
1. A spark ignition type internal combustion engine that operates in a high engine load range above a predetermined engine load and a low engine load range below the predetermined engine load, the engine comprising: a variable compression ratio mechanism that changes a mechanical compression ratio of the engine, the variable compression ratio mechanism making the mechanical compression ratio higher in the low engine load range than the mechanical compression ratio in the high engine load range, the variable compression ratio mechanism making the mechanical compression ratio continuously decrease as an engine load increases within the high engine load range; a variable valve timing mechanism that controls a closing timing of an intake valve, the variable valve timing mechanism shifting the closing timing of the intake valve in a direction away from an intake bottom dead center as the engine load decreases; and a throttle valve arranged in an engine intake passage that controls an intake air amount, the throttle valve being closed as the engine load decreases in the low engine load range, an actual compression ratio decreasing as the engine load decreases in the low engine load range.