基于RPI 3B+的AlphaBot2机器人启动电机后自动断电如何解决？

我正在组装一款可编程导航机器人，可通过读取标识牌上的指令（如卫生间右转）在室内导航，硬件采用AlphaBot2套件和RPI 3B+。

图像处理部分运行正常，但运动控制模块出现异常：我编写了简易PID控制器驱动电机，但电机一启动机器人就自动断电。

相关代码如下：

PID与电机驱动代码 #

iPWM = 20 # initial motor power in duty cycle
MAX_PWM = 100 
dt = 0.001 # time step

#PID PARAMETERS#
KP = 0.2
KD = 0.01
KI = 0.00005

targets = ['BATHROOM', 'RESTAURANT', 'BALCONY']

class PID(object):
    def __init__(self,target):
        
        self.target = target
        self.kp = KP
        self.ki = KI
        self.kd = KD 
        self.setpoint = 320
        self.error = 0
        self.integral_error = 0
        self.error_last = 0
        self.derivative_error = 0
        self.output = 0
        
    def compute(self, pos):
        self.error = self.setpoint - pos
        #self.integral_error += self.error * TIME_STEP
        self.derivative_error = (self.error - self.error_last) / dt
        self.error_last = self.error
        self.output = self.kp*self.error + self.ki*self.integral_error + self.kd*self.derivative_error
        if(abs(self.output)>= MAX_PWM-iPWM and (((self.error>=0) and (self.integral_error>=0))or((self.error<0) and (self.integral_error<0)))):
            #no integration
            self.integral_error = self.integral_error
        else:
            #rectangular integration
            self.integral_error += self.error * dt
        
        if self.output>= MAX_PWM-iPWM:
            self.output = MAX_PWM-iPWM
    
            
        elif self.output <= -MAX_PWM:
            self.output = iPWM - MAX_PWM
        return self.output
        


class MOTORS(object):
    
    def __init__(self,ain1=12,ain2=13,ena=6,bin1=20,bin2=21,enb=26):
        self.AIN1 = ain1
        self.AIN2 = ain2
        self.BIN1 = bin1
        self.BIN2 = bin2
        self.ENA = ena
        self.ENB = enb
        self.PA  = iPWM
        self.PB  = iPWM

        GPIO.setmode(GPIO.BCM)
        GPIO.setwarnings(False)
        GPIO.setup(self.AIN1,GPIO.OUT)
        GPIO.setup(self.AIN2,GPIO.OUT)
        GPIO.setup(self.BIN1,GPIO.OUT)
        GPIO.setup(self.BIN2,GPIO.OUT)
        GPIO.setup(self.ENA,GPIO.OUT)
        GPIO.setup(self.ENB,GPIO.OUT)
        self.PWMA = GPIO.PWM(self.ENA,500)
        self.PWMB = GPIO.PWM(self.ENB,500)
        self.PWMA.start(self.PA)
        self.PWMB.start(self.PB)
        self.stop()

    def forward(self):
        self.PWMA.ChangeDutyCycle(self.PA)
        self.PWMB.ChangeDutyCycle(self.PB)
        GPIO.output(self.AIN1,GPIO.LOW)
        GPIO.output(self.AIN2,GPIO.HIGH)
        GPIO.output(self.BIN1,GPIO.LOW)
        GPIO.output(self.BIN2,GPIO.HIGH)
    
    def updatePWM(self,value):
        if value<0:
            self.PA = iPWM+abs(value)
            self.PB = iPWM
            self.PWMA.ChangeDutyCycle(self.PA)
            self.PWMB.ChangeDutyCycle(self.PB)
        if value>0:
            self.PA = iPWM
            self.PB = iPWM+value
            self.PWMB.ChangeDutyCycle(self.PB)
            self.PWMA.ChangeDutyCycle(self.PA)
        if value ==0:
            self.PA = iPWM
            self.PB = iPWM
            self.PWMB.ChangeDutyCycle(self.PB)
            self.PWMA.ChangeDutyCycle(self.PA)
            
        GPIO.output(self.AIN1,GPIO.LOW)
        GPIO.output(self.AIN2,GPIO.HIGH)
        GPIO.output(self.BIN1,GPIO.LOW)
        GPIO.output(self.BIN2,GPIO.HIGH)
        
        
    
    def stop(self):
        self.PWMA.ChangeDutyCycle(0)
        self.PWMB.ChangeDutyCycle(0)
        GPIO.output(self.AIN1,GPIO.LOW)
        GPIO.output(self.AIN2,GPIO.LOW)
        GPIO.output(self.BIN1,GPIO.LOW)
        GPIO.output(self.BIN2,GPIO.LOW)

摄像头采集循环调用代码 #

cx = int(x+w//2)

    if d<= 60:
        mot.stop()
        GPIO.cleanup()
dutyCycle = pid.compute(cx)
pwm = mot.updatePWM(dutyCycle)

排查修复方案 #

• 供电问题优先排查：AlphaBot2双电机启动峰值电流可达2A以上，普通树莓派Micro USB供电无法承载，会触发过流保护断电。建议用输出3A以上的18650电池组给电机驱动独立供电，树莓派单独供电，避免电机电流波动拉低系统电压。
• PID参数调整：当前KD参数过高，dt仅为0.001s会放大摄像头采样的噪声，导致瞬间PWM输出过大。可先将KD调低到0.001，KI暂时设为0，测试基础运动正常后再逐步微调参数。
• 功率限制修改：初始iPWM可先降到10，MAX_PWM限制到60，避免电机满功率启动触发过流。
• 硬件接线检查：确认电机正负极、驱动模块接线没有虚接短路，GPIO引脚没有接错。

内容的提问来源于stack exchange，提问作者ofer simchovitch