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    Electric golf car with low-speed regenerative braking
    1.
    发明授权
    Electric golf car with low-speed regenerative braking 失效
    电动高尔夫球车低速再生制动

    公开(公告)号：US06686719B2

    公开(公告)日：2004-02-03

    申请号：US10262224

    申请日：2002-10-01

    申请人： John Cochoy ,  Carlton W. Hearn

    发明人： John Cochoy ,  Carlton W. Hearn

    IPC分类号： H02P742

    CPC分类号： B60L7/003 ,  B60L7/12 ,  B60L11/1805 ,  B60L2200/22 ,  Y02T10/7005

    摘要： A control system for an electric vehicle, such as a golf car, that includes a plurality of power MOSFETs. The vehicle includes a shunt wound motor including an armature coil and a field coil. One of the MOSFETs is connected in parallel across the armature coil and another MOSFET is connected in series with the armature coil. The MOSFET across the armature coil includes a freewheel diode. When the motor is operating below its base speed, i.e., when the back EMF is below the power supply voltage, a current flow can be induced by momentarily turning on the series MOSFET, shorting the armature coil. Because of the residual inductance in the motor, a current flow in the counter clockwise direction is initiated at which point the series MOSFET is turned off. Consequently, a large voltage spike across the motor occurs which results in current flow back into the battery pack. By quickly turning the series MOSFET on and off the current flow can be maintained, and the regenerative braking can occur even at slow speeds. The control system also allows the vehicle to be operated at speeds below its base speed, and provide field current control by measuring the armature current in the negative quadrant of the field map.

    摘要翻译： 一种用于诸如高尔夫球车的电动车辆的控制系统，其包括多个功率MOSFET。 车辆包括包括电枢线圈和励磁线圈的并联绕组电动机。 其中一个MOSFET并联在电枢线圈上，另一个MOSFET与电枢线圈串联连接。 跨越电枢线圈的MOSFET包括续流二极管。 当电动机工作低于其基本速度时，即当反电动势低于电源电压时，可以通过瞬时接通串联MOSFET来引起电流流动，使电枢线圈短路。 由于电动机中的剩余电感，起始逆时针方向的电流流过，串联MOSFET被断开。 因此，电机上出现大的电压尖峰，导致电流回流到电池组中。 通过快速打开和关闭串联MOSFET可以保持电流，即使在低速下也可能发生再生制动。 控制系统还允许车辆以低于其基本速度的速度运行，并且通过测量场地图的负象限中的电枢电流来提供励磁电流控制。

    Electric golf car with low-speed regenerative braking
    4.
    发明授权
    Electric golf car with low-speed regenerative braking 有权
    电动高尔夫球车低速再生制动

    公开(公告)号：US06462506B2

    公开(公告)日：2002-10-08

    申请号：US09736657

    申请日：2000-12-14

    申请人： John Cochoy ,  Carlton W. Hearn

    发明人： John Cochoy ,  Carlton W. Hearn

    IPC分类号： H02P742

    CPC分类号： B60L7/003 ,  B60L7/12 ,  B60L11/1805 ,  B60L2200/22 ,  Y02T10/7005

    摘要： A control system for an electric vehicle, such as a golf car, that includes a plurality of power MOSFETs. The vehicle includes a shunt wound motor including an armature coil and a field coil. One of the MOSFETs is connected in parallel across the armature coil and another MOSFET is connected in series with the armature coil. The MOSFET across the armature coil includes a freewheel diode. When the motor is operating below its base speed, i.e., when the back EMF is below the power supply voltage, a current flow can be induced by momentarily turning on the series MOSFET, shorting the armature coil. Because of the residual inductance in the motor, a current flow in the counter clockwise direction is initiated at which point the series MOSFET is turned off. Consequently, a large voltage spike across the motor occurs which results in current flow back into the battery pack. By quickly turning the series MOSFET on and off the current flow can be maintained, and the regenerative braking can occur even at slow speeds. The control system also allows the vehicle to be operated at speeds below its base speed, and provide field current control by measuring the armature current in the negative quadrant of the field map.

    摘要翻译： 一种用于诸如高尔夫球车的电动车辆的控制系统，其包括多个功率MOSFET。 车辆包括包括电枢线圈和励磁线圈的并联绕组电动机。 其中一个MOSFET并联在电枢线圈上，另一个MOSFET与电枢线圈串联连接。 跨越电枢线圈的MOSFET包括续流二极管。 当电动机工作低于其基本速度时，即当反电动势低于电源电压时，可以通过瞬时接通串联MOSFET来引起电流流动，使电枢线圈短路。 由于电动机中的剩余电感，起始逆时针方向的电流流过，串联MOSFET被断开。 因此，电机上出现大的电压尖峰，导致电流回流到电池组中。 通过快速打开和关闭串联MOSFET可以保持电流，即使在低速下也可能发生再生制动。 控制系统还允许车辆以低于其基本速度的速度运行，并且通过测量场地图的负象限中的电枢电流来提供励磁电流控制。