An electric powertrain should control motor torque and not speed to allow both an IC engine as well as the electric drive to operate in parallel. The Simulink Toolbox in Matlab is a very valuable tool in designing the control electronics. Additionally, the use of separately excited DC motors allow for a minimum loss operation at low speeds and field weakening at high speeds. Separately excited DC motors are ideal for use in an electric drivetrain from the control viewpoint, but their higher cost and higher weight to horsepower ratio are serious negative factors. Induction and brushless DC motors can be controlled with a similar strategy with more involved circuitry, but with a substantial decrease in weight and higher efficiency. The results of the evaluated vehicle in the 1995 Chrysler HEV Challenge demonstrated a synergistic effect by using the IC engine in parallel with an electric drivetrain. This parallel hybrid mode of operation increased the battery output by a 62 % (6.5 kWh/4.0 kWh) factor and allowed for much higher IC engine efficiency due to continuous 5th gear operation. 128 miles have been travelled at an average speed of 42 mph on a twisting up-hill down-hill course on 2.9 gallons of gasoline plus 6.5 kWh of electric energy or 44 mpg plus approximately 65 cents of electricity in an Escort stationwagon weighing 4000 lbs.
The road to success: the WSU entry in the 1995 HEV challenge
Das Konzept der Wayne State Universität für die Teilnahme an dem Chrysler-Programm für Kraftfahrzeuge mit Hybridantrieb
1996
8 Seiten, 7 Bilder, 2 Tabellen, 4 Quellen
Conference paper
English
The Road to Success: The WSU Entry in the 1995 HEV Challenge
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