Importance

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Abstract

The present invention relates to a method for controlling an inverter that controls an electric machine and that is controlled by a first control device in a nominal operating mode and by a second control device in order to apply a safety operating mode. The safety mode is chosen from: —an ASC operating mode in which phases of the electric machine (5) are short-circuited; and —an FW operating mode that puts the electric machine (5) into freewheeling mode. The method comprises, in order to select the safety mode to be applied: determining the voltage on a high-voltage bus (UHVDC), and —if the voltage on the high-voltage bus (UHVDC) is lower than a first voltage threshold (Uthi), the FW mode is selected (S4), —if the voltage on the high-voltage bus (UHVDC) is greater than a second voltage threshold (Uth2) that is greater than the first voltage threshold (Uthi), the ASC mode is selected (S6), —if the voltage is between t first voltage threshold (Uthi) and the second voltage threshold (Uta), a parameter is determined representative of the ability of the electric machine to inject power onto said high-voltage bus in a risk-free manner is determined; and —if the parameter is greater than or equal to a threshold value, ASC mode is selected (S8); —if the parameter is lower than the threshold value, the FW mode is selected (S9).

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First Claim