Patent ID: 7415948
Filing Date: 2008-08-26
Classification: F01B,F01L,F02B,F02D,F02F,F02G,Y02T

Abstract:
1. An internal combustion engine having expansion and compression cylinders, pistons movable between top dead center and bottom dead center positions within the cylinders, an intake valve for controlling air flow to the compression cylinder, an outlet valve for controlling flow from the compression cylinder, an inlet valve for controlling flow to the expansion cylinder, an exhaust valve which normally opens after the piston in the expansion cylinder has passed its bottom dead center position and is traveling toward its top dead center position, and means active during coasting of a vehicle in which the engine is installed for enhancing engine braking by advancing the opening of the exhaust valve so that the exhaust valve opens when the piston in the expansion cylinder is at or near its bottom dead center position.