RE-ADHESION CONTROL METHOD EMPLOYING SPEED DIFFERENCE RATIO DURING IDLING/SLIPPAGE OF INVERTER-CONTROLLED ELECTRIC CAR

摘要

PURPOSE:To prevent recurrence of idling and slippage by restricting the slip frequency command and target current command after detection of idling or slippage untill the idling or the slippage disappears. CONSTITUTION:When the speed difference ratio R exceeds over a first set value, a speed pattern generator 22 receives an idle/slip detection signal SC and rewrites the content in a memory section 22A with reference to the normal slip frequency command (fSP) and normal target current IMP having 100% value. Then a slip frequency command and a current command obtained by subtracting the speed difference ratio R are fed, respectively as reference slip frequency command and target current command under idling/slippage, to the control system of an inverter 12. When the increment of the speed difference ratio R goes to zero and re-adhesion is started, the speed pattern generator 22 restricts the reference slip frequency command (fSP) and the target current command IMP under idling/slippage untill the idle/slip detection signal SD disappears.