Patent ID: 8288886
Filing Date: 2012-10-16
Classification: B60K,B60L,H02M,Y02T

Abstract:
1. A method for avoiding electrical resonance in a vehicle having a motor generator unit (MGU) and a high-voltage (HV) direct current (DC) bus that is shared by a first and a second power electronic converter device, the method comprising: determining an impedance characteristic of the HV DC bus; defining a set of resonance points of the HV DC bus using the impedance characteristic; determining and recording a resonance dead zone as a function of the set of resonance points, including recording each of a torque output of the MGU and a speed of the MGU, wherein the resonance dead zone includes an upper and a lower switching frequency boundary; and using the controller to execute an algorithm to automatically modify a switching frequency profile of the second power electronic converter device, such that the second power electronic converter device is prevented from operating within a frequency range defined by the upper and lower switching frequency boundary.