The start/stop of an internal combustion engine is probably the most common feature realizable in passenger car hybrid electric vehicles (HEV), regardless of system configuration and degree of hybridization, to achieve significant fuel economy savings in urban driving. Many examples of this feature are found in production or near-production gasoline hybrid vehicles today, with implementation through either belted starter/alternators or integrated starter/alternators. One of the key factors in the successful implementation of that technology is the ability to start and stop the engine quite fast with no or little unwanted vibrations, requiring a precise closed-loop control of the starter/alternator. This issue becomes even more acute in the case of a Diesel engine, as the instantaneous compression torque is quite large. With this in mind a simplified model of a 4-cylinder Diesel engine dynamics has been developed and identified with experimental data on a recent production, 1.9l Common-Rail Diesel engine. The engine is belt-coupled to a 10.6kW permanent magnet motor and its controller. The system was characterized in the test cell on a dynamometer to calibrate the dynamic model and develop the controller and the hardware was implemented in a mid-size prototype hybrid SUV. In this configuration, the starter/alternator is capable of starting the engine (0-800rpm idle speed) in 200-300ms, and stopping following a prescribed speed trajectory in 500-600ms with little or no vibration induced. Results from the experimental setup and from simulations are shown.

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