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This paper presents a comprehensive comparison to a SPM and an IPM machine for a mild ISG HEV application based on extensive practical test examinations. The two ISG PM machines have the same power rating and similar size in very thin pan-cake shape. The SPM ISG has more complex structure indented to deliver sinusoidal flux distribution in air-gap and reduce torque ripple. Comparatively the IPM is specially tailored to offer a trade-off solution in terms of cost and performance. It has much simpler structure with the concentrated winding in stator and simple single-barrier bar-shaped rotor structure. Two PM ISG machines are examined intensively in experiment in order to investigate their feasibility for the mild ISG application.

The control of vehicle clutches is somehow different of non-linearity from others and needs consideration of control matching between the clutch and engine. For that reason, an expert fuzzy control is proposed in this paper, which is integrated with expert control, fuzzy control and hierarchical control. By real vehicle test results, the control function is verified.