A motor is driven by the ³-axis current (I ³ ) of a ³´ coordinate system that is an imaginary rotating coordinate system. A command current value preparation unit (30) sets the ³-axis command current value (I ³ *) based on the command steering torque (T*) and the detected steering torque (T). The command current value preparation unit (30) includes a command current increase/decrease amount calculation unit (30A) and an addition unit (30B). The command current increase/decrease amount calculation unit (30A) calculates the current increase/decrease amount (I ³ *) for the command current value (I ³ *) based on the sign of the command steering torque (T*) and the deviation (T (= T - T*)) of the detected steering torque (T) from the command steering torque (T*). The current increase/decrease amount (AI ³ *) calculated by the command current increase/decrease amount calculation unit (30A) is added to the immediately preceding value (I ³ *(n-1)) of the command current value (I ³ *) by the addition unit (30B). Thus, the command current value (I ³ *) in the present calculation cycle is calculated.
Motor control unit and vehicle steering system
Motorsteuereinheit und Fahrzeuglenksystem
Unité de commande de moteur et système de direction de véhicule
2019-03-20
Patent
Electronic Resource
English
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