Abstract
Fuel economy improvement on medium-duty tactical truck has and continues to be a significant initiative for the U.S. Army. The focus of this study is the investigation of Automated Manual Transmissions (AMT) and mild hybridization powertrain that have potential to improve the fuel economy of the 2.5-ton cargo trucks. The current platform uses a seven-speed automatic transmission. This study utilized a combination of on-road experimental vehicle data and analytical vehicle modeling and simulation. This paper presents the results of (1) establishment of a validated, high fidelity baseline analytical vehicle model, (2) modeling and simulation of two AMTs and their control strategy, (3) optimization of transmissions shift schedules, and (4) modeling and simulation of engine idle stop/start and Belt-Integrated-Starter-Generator (B-ISG) systems to improve the fuel economy. The fuel economy discrepancy between experimental average and the baseline simulation result was 2.87%. The simulation results indicated a 14.5% and 12.2% fuel economy improvement for the 10-speed and 12-speed AMT respectively. A stop/start system followed by a B-ISG mild hybrid system incorporating regenerative braking was estimated to improve fuel economy 3.39% and 10.2% respectively.
Highlights
The U.S Government owns and maintains a large fleet of ground vehicles covering a wide spectrum of mission profiles
The powertrain hybridization included a stop/start system followed by a B-ISG mild hybrid system
The GT-Drive software [19] was used for the vehicle modeling and simulation in this project
Summary
The U.S Government owns and maintains a large fleet of ground vehicles covering a wide spectrum of mission profiles. The system enables early fuel cut-off during deceleration and shut off of the engine during idle It operates in two modes: (1) motoring—provides cranking torque to restart the engine when the brake pedal is released and to assist vehicle acceleration; (2) generating—charges the battery when the engine is running. This paper presents the results of (1) establishment of a validated, high fidelity baseline analytical vehicle model, (2) modeling and simulation of two AMTs and their control strategy, (3) optimization of transmissions shift schedules, and (4) modeling and simulation of engine idle stop/start and B-ISG systems to improve the fuel economy. Allison 3700SP, 7-speed automatic, electronically controlled, full-time all-wheel drive
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