METHOD OF DETERMING REGENERATIVE TARGET IN ELECTRIC CAR AND REGENERATIVE BRAKING CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To maximize a regenerative power and simultaneously prevent the overchanging to a battery. SOLUTION: A regenerative torque upper limit value Tbmax is calculated (116) based on the feedback value of a battery voltage Vb. A regenerative torque command value Treg (113) due to this Tbmax and then a hydraulic torque target value Thyd (102) due to he regenerative torque command value Treg are calculated respectively. The battery voltage Vb's capability of controlling a regenerative power PO so as not to exceed its maximum permissible voltage Vbmax enables the battery's overcharge to be prevented while maximizing the regenerative power. Also, a control constant (including a gain) required to control the regenerative power is determined (115) according to the battery's temperature, charging stage, etc., so that a voltage overshoot, a voltage oscillation, etc., arising from the change of battery condition are controllable. Because the control constant is updated (118) when the waveform of the battery voltage Vb shows its remarkable overshoot, etc., in regenerative recharging, the voltage overshoot, the voltage oscillation, etc., arising from the battery's variation over aging, etc., are also controllable.