Patent ID: 9742317
Date: 2017-08-22
CPC Classifications: B60L,H02P,Y02T

Claim:
1. A regenerative braking controlling system used for an electric vehicle, the electric vehicle comprising a motor having three phase armature windings, the regenerative braking controlling system comprising: an optimum regenerative path positioned between an original point of the rotating d-q coordinate system and an optimum regenerative current limit point; an sub-optimum regenerative path positioned between the optimum regenerative current limit point and an sub-optimum regenerative current limit point which divides a DC current end of the armature from a regenerative state to an output state; an energy consuming path positioned between the sub-optimum regenerative current limit point and a node where a maximum armature current circle intersects wherein the DC current end of the armature starts to provide mechanical energy for braking which is converted to consumption of power; a plurality of processing units configured to: obtain current of the three phase armature windings; determine a relationship between a regenerative power and a phase angle of the armature current according to the armature current; calculate an optimum phase angle, and obtain a phase regenerative path based on the optimum phase angle wherein the phase regenerative path comprises the optimum regenerative path, the sub-optimum regenerative path, and the energy consuming path; calculate the optimum regenerative current limit point, wherein the optimum regenerative current limit point is calculated according to equation that  wherein represents the armature current, P represents a number of poles of the armature of the motor, ω represents rotational angular velocity of the armature of the rotor, λ m represents magnetic flux of the magnet of the rotor, θ represents the phase angle of the armature current, r represents armature resistance of the motor, L calculate the sub-optimum regenerative current limit point; adjust regenerative current to follow the optimum regenerative path, the sub-optimum regenerative path, and the energy consuming path by comparing the armature current with the optimum regenerative current limit point and the sub-optimum regenerative current limit point; and wherein the regenerative current is decomposed into a first vector component and a second vector component along the direction of the d-axis and the q-axis respectively.