Output stage control in the event of a fault

摘要

A method for implementing a transition from a functioning steering assistance system to a deactivated steering assistance system when a fault occurs, comprising the following steps: establishing the fault of the steering assistance system; establishing that all high-side power switches are functional (first case), or establishing that all low-side power switches are functional (second case); and in the first case: opening all high-side power switches and performing PWM-like control of the low-side power switches; or in the second case: opening all low-side power switches and performing PWM-like control of the high-side power switches.

主权项

1. A method for implementing a peakless transition in required manual torque when transitioning, due to a fault, from a functioning steering assistance system to a deactivated steering assistance system, comprising the following steps:
establishing the fault of the steering assistance system; while occurrence of said fault is established, establishing that all high-side power switches are functional (first case) or establishing that all low-side power switches are functional (second case); and while occurrence of said fault is established, dissipating energy from a driving motor of the steering assistance system to achieve a smooth transition without peaks in required manual torque to transition from said functioning steering assistance system to said deactivated steering system by in the first case: opening all high-side power switches and performing PWM-like control of the low-side power switches; or in the second case: opening all low-side power switches and performing PWM-like control of the high-side power switches.