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Multi-energy management strategy plays an important role in fuel economy improvement for hybrid electric vehicles. For the integrated starter generator hybrid electric car in this paper, multi-energy management becomes torque distribution. The novel torque distribution strategy is proposed to minimize the powertrain equivalent specific fuel consumption. The distribution results are essentially three-dimensional look-up table-based control according to the vehicle torque request, the internal combustion engine speed and the ultracapacitor voltage after off-line calculation. Simulations results show that potential fuel economy improvement is achieved relative to the conventional logic threshold control strategy.

Rapid pressure build-up before acquiring the engine phase position is necessary to improve the start performance for a common rail diesel engine. This paper presents a simulation model to describe the pressure build-up process of the DENSO HP0-MD high-pressure pump, with the two pressure-control-solenoid-valves (PCV) are frequently driven in sequence. As the fuel is pumped only when one PCV is energized in its corresponding plunger supply stroke, simulation studies are carried out to analyze the pressure build-up effect of different driving frequency, and the 30Hz frequency is selected as the optimal driving frequency to achieve about 80% fuel supply efficiency for the normal cranking speed range. Additionally, when only the crankwheel signal is useful, a novel method, which checks whether the rail pressure rises in a special PCV energizing zone, is designed to assistant ascertain engine phase.