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The main objective of the combined control unit is to develop a cost effective and optimal control system that manage the proper torque distribution and minimize the loss of communication delay caused by individual inter-controller cooperative control. The control systems of the Hybrid Electric Vehicle (HEV) are more complicated than conventional vehicle. The major difference of HEV has Power Electronics (PE) system. The control systems of PE-part in the HEV are consisted with Hybrid Control Unit (HCU), Motor Control Unit (MCU) and Battery Management System (BMS) individually. In this study, the controllers of PE system are combined into one PCB (1Board-1Micom). Vehicle-testing and dynamometer-testing results confirm that the combined control unit achieves approximately 45% cost and 47% weight reduction compare to the non-combined (Individual controllers) same hybrid vehicle.

This paper presents a conditional misfire monitoring method to reduce the computing burden of the motoring. In this conditional monitoring method, the ECU performs misfire detection only when there is high probability of misfire events. The condition for performing the misfire detection is determined by the pre-index which is defined as the deviation of the segment durations of the crankshaft in this paper. The quantity of the code of calculating the pre-index is 7 times less than that of a conventional monitoring method so that the computing burden can be reduced with the conditional monitoring method. The experimental results shown that the pre-index and the conditional monitoring method are valid.