TRANSFER HEAT FLOW RATE ESTIMATING DEVICE FOR ESTIMATING FLOW RATE OF HEAT TRANSFERRED FROM CYLINDER TO AIR SUCKED IN CYLINDER OF INTERNAL COMBUSTION ENGINE, AND INTAKE AIR VOLUME ESTIMATING DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To accurately estimate a heat flow rate transmitted to air in a cylinder from the cylinder by accurately estimating an air flow speed in the cylinder. SOLUTION: An electric control device 80 estimates a speed (an intake valve passing flow speed) uc at the periphery of an intake valve of the air sucked in the cylinder 21 by passing through the intake valve 32, and estimates a cylinder air flow speed (u) being an average speed of the air in the cylinder on the basis of an equation of motion Mct×(du/dt)=mc×uc-fp always satisfied with respect to the air in the cylinder. Here, Mct is the mass of the air in the cylinder, (u) is the cylinder air flow speed, mc is a flow rate of the air sucked in the cylinder by passing through the periphery of the intake valve, uc is the intake valve passing flow speed, and fp is a force for damping a flow speed of the air by the viscosity of the air in the cylinder. The electric control device estimates a transmission rate and a heat flow rate of heat transmitted to the air in the cylinder from the cylinder on the basis of the cylinder air flow speed (u). COPYRIGHT: (C)2005,JPO&NCIPI