Patent ID: 6766790
Filing Date: 2004-07-27
Classification: F02D

Abstract:
A method for warming up a direct-injection internal combustion engine having an operating temperature including an internal combustion engine of a motor vehicle, the method comprising the steps of:injecting fuel directly into a combustion chamber of said engine; determining a warm-up factor (fWL) for increasing the quantity of the injected fuel at a temperature of said engine below said operating temperature from a base factor (fG) and a load-dependent factor (fLA) with said load-dependent factor (fLA) being determined for first and second modes of operation of said direct-injection internal combustion engine independently of said base factor (fG) with said first mode of operation being a stratified mode of operation wherein the fuel is injected directly into said combustion chamber during the compression phase and with said second mode of operation being a homogeneous mode of operation wherein the fuel is injected directly into the combustion chamber during the induction phase.