Daimlerchrysler Corporation

Amit K Sanyal

Timothy A Coatesworth

Gregory L Ohl

Mark J Duty

Chris D Kapolnek

Mikhail Zarkhin

Michael J Cari

Rajiv Saxena

A method is provided for determining the barometric pressure external to an air intake of an internal combustion engine, comprising the steps of: (a) providing a pressure value indicative of an absolute pressure in the intake manifold of the engine; (b) providing a mass airflow value of the airflow into the engine; (c) characterizing a pressure drop across the intake system based on the mass airflow value; and (d) determining a barometric pressure based on the pressure value and the pressure drop, such that the pressure drop is indicative of the pressure differential between the atmospheric pressure and the pressure in the intake manifold. Furthermore, the determination of the barometric pressure may be triggered when the throttle blade reaches a predetermined throttle threshold position which is a function of the rotational speed of the engine.

Method of determining barometric pressure for use in an internal combustion engine

A method is provided for accommodating the purge vapors from an evaporative emission control system of an automotive vehicle. The method includes a means of learning the bank-to-bank distribution of purge vapors within the engine manifold. As such, the fuel to air ratio delivered from various injectors can be selectively controlled to accommodate the purge vapor at that bank of the engine and maintain the desired fuel to air ratio.

Method of determining distribution of vapors in the intake manifold of a banked engine

A method is provided for injecting fuel into an internal combustion engine. The method includes providing the engine with a plurality of fuel injectors, each including an electromechanical mechanism for receiving fuel under pressure via a fuel supply system and for injecting a measured amount of fuel into the engine in response to a command signal whose duration is indicative of the amount of fuel to be injected. The command signal is determined based upon a measured throttle position, engine speed and engine load. A resistance of a solenoid coil of the electromechanical mechanism is then calculated and the command signal is adjusted by incrementing or decrementing the command signal to compensate for variations in the measured resistance of the solenoid coil of electromechanical mechanism due to temperature variations.

Injection temperature fuel feedback

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Troy, MI, United States of America

Amit K Sanyal