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    • 3. 发明专利
    • Brake control system of electric truck
    • 电动刹车控制系统
    • JPS59165901A
    • 1984-09-19
    • JP4012083
    • 1983-03-10
    • Shinko Electric Co Ltd
    • OOZEKI MOTOO
    • H02P3/08B60L7/00B60L7/12B60L7/22
    • B60L7/006B60L7/04B60L7/12B60L7/22B60L11/1805B60L15/2009B60L2200/26B60L2200/36B60L2240/421Y02T10/645Y02T10/7005Y02T10/72Y02T10/7275
    • PURPOSE:To perform energy-saving of an electric forklift truck by regeneratively braking the truck when the rotating speed of a motor is high and switching to a plugging brake when the speed decreases. CONSTITUTION:When a reverse switch RS is closed while an electric truck is traveling forward, an armature MA is first switched to reverse polarity, and a field energy is applied through a field resistor R1 to a field MF, thereby forming a field magnetic flux. A brake current is flowed through a chopper CH SR1 in the ON zone of a chopper CH and through a diode SR1 and a battery E in the OFF zone of the chopper CH by the induced voltage of reverse polarity generated in the motor armature. When the brake current detected by a current detector CT decreases lower than the reference value, the output level of a comparator CP becomes H level, a reverse drive circuit is formed in a power mode, and switched to a plugging brake.
    • 目的:通过在电机转速较高时重新制动卡车并在速度降低时切换到堵头制动器,对电动叉车进行节能。 构成:当电动叉车向前行驶时,当反向开关RS闭合时,首先将电枢MA切换为反极性,并且通过场电阻器R1将场能施加到场MF,从而形成场磁通量。 制动电流通过电动机电枢中产生的相反极性的感应电压流过斩波器CH的导通区域中的斩波器CH SR1,并通过斩波器CH的OFF区域中的二极管SR1和电池E流动。 当由电流检测器CT检测到的制动电流降低到低于参考值时,比较器CP的输出电平变为H电平,在功率模式下形成反向驱动电路并切换到堵塞制动器。
    • 4. 发明专利
    • Chokuryukenindendokinoseigyosochi
    • JPS5174216A
    • 1976-06-28
    • JP13878975
    • 1975-11-20
    • Gen Electric
    • ROBAATO KAARU KURAAKU
    • H02P3/08B60L7/00B60L7/12B60L15/28H02P3/10H02P3/14H02P7/29
    • B60L7/006B60L3/0084B60L7/12B60L2240/36B60L2240/429H02P3/14Y02T10/648Y02T10/7258
    • 1518297 Controlling D.C. motors GENERAL ELECTRIC CO 23 Oct 1975 [20 Nov 1974] 43606/75 Heading H2J A D.C. motor control system comprises a time ratio controlled switching means 22 for controlling motor current, a plug sensing circuit including logic means responsive to a signal representative of a direction change command for the motor for initiating a signal for at least a predetermined period, said signal causing the current supplied to the motor to be limited to a predetermined level during plugging, and inhibit means responsive to a signal representative of the percentage on time of the switching means 22 for extending said predetermined period until the percentage on time achieves a predetermined value. As shown, a switch 14 energizes one or other of coils 16 and 18 for direction contactors F1, F2 and R1, R2 respectively in the field 21 and armature 20 circuit of the motor. The switching means 22 receives pulses from a voltagecontrolled oscillator 25 whose input is connected to receive a voltage from a circuit 27 which includes an operator-controlled potentiometer 28 and a capacitor 30. With the switch 14 in the position shown the contactors F1 and R2 are closed and the motor rotates in a forward direction at a speed controlled by the setting on potentiometer 28. In this condition a circuit comprising an inverter 45, a time delay 46 and a flip-flop 48 apply logic is to both inputs of an exclusive OR gate 47 which thus applies a logic zero to an AND gate 50. The logic zero output of AND gate 59 is applied to a current limit circuit 31 which also receives a signal representing the current flowing through the motor. This circuit 31 includes a pair of comparators 32, 33 having different references applied thereto. The logic zero from gate 50 disables the comparator 33 and thus the motor current is limited to the reference of comparator 32. If now the switch 14 is charged to reverse the motor for plugging, initially the AND gate 55 produces a zero output and a logic zero is inverted by an inverter 59 to turn on a transistor 56 to discharge capacitor 30 and remove the voltage from oscillator 25. When the switch then energize the contactor coil 18, the OR gate 47 provides a logic 1 output to cause AND gate 50 to provide a logic 1 output to circuit 31. This output disables comparator 32 and the motor current is then limited to the reference of comparator 33. When the percentage on time of the switching means 22 reaches a predetermined level, an amplifier 57 provides a logic 1 to AND gate 55 which then provides a logic 1 via a time delay 58 to disable the flipflop 48 and thus cause the OR gate 47 to again provide a logic zero to AND gate 50. The comparator 33 is thus again disabled, and the comparator 32 is enabled. A manually operable switch 61 is provided for overriding this system, e.g. if a vehicle in which this arrangement is provided is operating on a ramp where it is desired to provide normal current limit to prevent roll back.
    • 9. 发明专利
    • Electric vehicle control device
    • 空值
    • JP3644174B2
    • 2005-04-27
    • JP1497997
    • 1997-01-29
    • 株式会社デンソー
    • 有司 宇佐美
    • B60L3/00B60L9/16B60L15/20H02M7/44H02M7/48H02P3/18H02P27/06H02P5/41
    • H02P3/18B60L7/006B60L11/123B60L11/14B60L11/1803B60L2210/44B60L2220/12B60L2240/423B60L2250/26B60L2270/145H02P21/05Y02T10/6217Y02T10/643Y02T10/7005Y02T10/7077Y02T10/7241Y02T10/7258
    • A power system of an electric vehicle is composed of a three-phase induction motor, an inverter for supplying alternating current converted from direct current of a battery mounted on the vehicle and a controller including a microcomputer for controlling the power supply to the motor. The controller calculates a torque required to drive the motor according to driving conditions of the vehicle. When a signal to stop the motor is generated, the power supply from the inverter to the motor is not immediately turned off but gradually decreased according to a predetermined torque decrease ratio if the motor is driven at that time with a torque higher than a predetermined level, to avoid uncomfortable vibrations of the motor associated with the abrupt turning off of the power supply thereto. The power supply to the motor is finally turned off when the torque of the motor is decreased to the level below the predetermined value. Thus, the uncomfortable vibration of the motor otherwise associated with the turning off of the power supply is avoided. Since the torque level permitting the turning off of the power supply and the torque decrease ratio are preset at optimum values based on vibration characteristics of the motor including its mounting, the motor is turned off within a reasonably short period of time after the signal to stop the motor is generated.
    • 电动车辆的电力系统由三相感应电动机,用于提供由安装在车辆上的电池的直流电转换的交流电的逆变器和包括用于控制对电动机的供电的微计算机的控制器组成。 控制器根据车辆的驾驶条件计算驱动马达所需的扭矩。 当产生停止电动机的信号时,如果电动机在此时以高于预定水平的转矩驱动,则从逆变器到电动机的电源不会立即关闭,而是按照预定的转矩减小比逐渐减小 ,以避免与其电源的突然关闭相关联的电动机的不舒服的振动。 当马达的扭矩降低到低于预定值的水平时,马达的电源最终关闭。 因此,避免了与电源的关闭有关的电机的不舒服的振动。 由于允许关闭电源的转矩水平和转矩减小率基于包括其安装在内的电动机的振动特性被预设为最佳值,因此在停止信号之后的相当短的时间内关闭电动机 产生电机。