Design and simulation of high-performance hybrid electric vehicle powertrains

The intent of this study was the design, modeling, and simulation of several high-performance light-duty hybrid electric vehicle powertrains. The design requirements of each proposed configuration are to meet or exceed a set of performance baselines based on a composite set of particular high-performance conventional vehicles presently available, while demonstrating increased fuel efficiency over regulated government cycles.;Several hybrid powertrain configurations were studied; however, the most promising and feasible for production designs were selected for further modeling. All of the proposed designs are post-transmission parallel hybrids for primarily performance reasons, with the auxiliary motive power coming after the transmission, utilizing a modeled spark-ignited, Variable Valve Timing (VVT) equipped internal combustion engine. A control strategy has been developed for the operation of these powertrains for virtually any driving condition---the strategy was not optimized for any particular government regulated cycle. Computer simulations were performed to simulate both the performance and the fuel economy of the proposed vehicle designs.;The simulation results show that the fuel economy of the modeled hybrid vehicles exceeds that of the comparable conventional vehicles, as well as meeting or exceeding the performance requirements of the baseline vehicles by 12--23%. In addition the exhaust gas emissions may be reduced, compared to a conventional vehicle due to hybridization. All modeled components were selected from available off-the-shelf applications, and the selected designs were chosen to be readily mass-produced

Systems engineering approach to engine test stand development for micropatching evaluations

2022 Summer.Includes bibliographical references.This project applies systems engineering methodology to develop an engine test stand used to extract, patch and validate the binary file of a diesel engine electronic control module. Electronic control modules operate modern systems ranging from aircraft and spacecraft to automobiles, heavy trucks and industrial equipment. These systems are often used for decades, which may be beyond the period for which manufacturers provide support. The binary code operating these embedded controllers may need to be patched as part of maintenance or compatibility with updated requirements. The objective of this thesis is to design an evaluation system to test the extraction, patching and deployment of binary code operating an engine control module of a legacy engine platform, a Cummins 6.7L diesel engine with a Cummins CM2350 engine controller, which does not have source code available. However, through binary analysis and micropatching, it is possible to update the binary of the ECM firmware by applying a patch to change specific attributes of the operation of the ECU. To verify the results of the patch, the binary is deployed to the engine controller and the operation of the engine is assessed. An engine on a dynamometer test stand was reconfigured to be an evaluation platform for assuring non-interference attributes of the ECM binary. Requirements were identified, architecture was established, and validation was tied to corresponding test stand requirements. A method to solve an iterative numerical calculation with convergence criterion set incorrectly was implemented on the ECM, and that method was then patched with a correct convergence criterion. The evaluation system was documented for other operators to execute the evaluations