diff --git a/auto-fan.service b/auto-fan.service
index 1b0a90c..a4c6e1b 100644
--- a/auto-fan.service
+++ b/auto-fan.service
@@ -7,7 +7,7 @@ User=root
 Group=root
 
 WorkingDirectory=/opt/Auto_Fan
-ExecStart=/opt/Auto_Fan/fan
+ExecStart=/opt/Auto_Fan/fan --duty-min 20
 
 Restart=always
 RestartSec=5
diff --git a/fan.py b/fan.py
index 3421c22..b34e892 100644
--- a/fan.py
+++ b/fan.py
@@ -2,6 +2,7 @@ import pigpio
 import time
 import json
 import math
+import argparse
 
 class LowPassFilter:
     def __init__(self,fc,Ts):
@@ -32,6 +33,8 @@ Ki = 0.01
 Kd = 0.03
 
 TARGET_TEMP =60.0  # 目标温度
+DUTY_MIN = 10    # 最小占空比（风扇启动需要）
+DUTY_PROTECT = 30  # 故障保护占空比（超过这个占空比但转速很低可能是风扇卡住了）
 
 # =====================
 # 全局变量
@@ -91,6 +94,20 @@ def pid_control(temp):
     return output
 
 if __name__=="__main__":
+    parser = argparse.ArgumentParser(description="Auto fan control")
+    parser.add_argument("--target-temp", type=float, default=TARGET_TEMP, help="目标温度 (默认: %(default)s)")
+    parser.add_argument("--duty-min", type=int, default=DUTY_MIN, help="最小占空比 (默认: %(default)s)")
+    parser.add_argument("--duty-protect", type=int, default=DUTY_PROTECT, help="故障保护占空比 (默认: %(default)s)")
+    parser.add_argument("--pwm-pin", type=int, default=PWM_PIN, help="PWM 引脚 (默认: %(default)s)")
+    parser.add_argument("--tach-pin", type=int, default=TACH_PIN, help="TACH 引脚 (默认: %(default)s)")
+    args = parser.parse_args()
+
+    TARGET_TEMP = args.target_temp
+    DUTY_MIN = args.duty_min
+    DUTY_PROTECT = args.duty_protect
+    PWM_PIN = args.pwm_pin
+    TACH_PIN = args.tach_pin
+
     temp_low_pass = LowPassFilter(1,0.1)
     duty_low_pass = LowPassFilter(0.5,0.1)
     # =====================
@@ -121,8 +138,8 @@ if __name__=="__main__":
             duty = int(duty_low_pass.filter(max(0, min(255, int(pid_out * 5)))))
 
             # 最小转速保护
-            if duty < 10:
-                duty = 10
+            if duty < DUTY_MIN:
+                duty = DUTY_MIN
 
             pi.set_PWM_dutycycle(PWM_PIN, duty)
 
@@ -131,12 +148,12 @@ if __name__=="__main__":
             # 把实时状态写到内存盘（/dev/shm 不伤SD卡），其他程序直接读这个JSON即可
             try:
                 with open("/dev/shm/fan_status.json", "w") as f:
-                    json.dump({"temp": temp, "rpm": rpm, "pwm": duty, "is_stalled": (duty > 100 and rpm < 500)}, f)
+                    json.dump({"temp": temp, "rpm": rpm, "pwm": duty, "is_stalled": (duty > DUTY_PROTECT and rpm < 500)}, f)
             except Exception:
                 pass
 
             # 风扇故障检测
-            if duty > 100 and rpm < 500:
+            if duty > DUTY_PROTECT and rpm < 500:
                 print("\n⚠️ Fan may be stalled!")
 
             time.sleep(0.1)
diff --git a/install.sh b/install.sh
index 759c90c..d03edbb 100755
--- a/install.sh
+++ b/install.sh
@@ -1,13 +1,21 @@
 #!/bin/bash
 
+echo "Installing Auto Fan..."
+echo "Cleaning up old files..."
+systemctl stop auto-fan
 rm -rf /opt/Auto_Fan
 rm -rf /etc/systemd/system/auto-fan.service
 
+echo "Copying new files..."
 mkdir -p /opt/Auto_Fan
 cp -rf dist/fan /opt/Auto_Fan/
 chmod +x /opt/Auto_Fan/fan
-cp -rf auto-fan.service /etc/systemd/system/
 
+echo "Setting up systemd service..."
+rm -rf /dev/shm/fan_status.json
+cp -rf auto-fan.service /etc/systemd/system/
 systemctl daemon-reload
 systemctl enable auto-fan
-systemctl start auto-fan
\ No newline at end of file
+systemctl start auto-fan
+
+echo "Installation complete! Auto Fan is now running."
\ No newline at end of file