Daimlerchrysler Corporation

Michael J Cari

Timothy A Coatesworth

Gregory L Ohl

Mark J Duty

Mikhail Zarkhin

Chris D Kapolnek

Sven Merkle

Amit K Sanyal

Rajiv Saxena

A method is provided for controlling power units of a vehicle powertrain for optimizing their respective efficiencies, thereby optimizing an overall vehicle efficiency. The method includes the steps of determining an efficiency of a power unit, determining present operational data of the power unit, determining a torque to be provided to the vehicle powertrain, determining a plurality of optimization constraints as a function of the torque to be provided, the present operational data and the efficiency of the power unit, determining an optimized operation mode of the power unit as a function of the optimization constraints and the present operational data of the power unit, and manipulating the power unit to operate in the optimized operation mode.

Efficiency-based engine, powertrain and vehicle control

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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Berkley, MI, United States of America

Michael J Cari