Patent ID: 6805095
Filing Date: 2004-10-19
Classification: F01N,F02B,F02D,Y02T

Abstract:
A method is provided for controlling cylinder charge in a direct-injection, spark-ignition engine, such engine having an intake manifold and an electronically controlled throttle (ETC) valve controlling air flow from the atmosphere to the intake manifold of said engine, such method comprising:(A) measuring an intake manifold pressure value, Pi,; (B) measuring a flow value, Wthr,m, indicative of flow through the ETC valve; (C) determining a desired intake manifold pressure value, Pi.d; (D) determining a desired flow, Wthr,d, through the ETC valve; (E) determining a desired ETC valve position, uthr,d; and, (F) adjusting said ETC valve position, uthr, in accordance with: (i) said desired ETC valve position, Uthr,d; (ii) a difference between the measured intake manifold pressure value, Pi, and the determined desired intake manifold pressure value, Pi,d; and (iii) a difference between the measured flow value, Wthr,m, through the ETC valve and the determined desired flow, Wthr.d.