当车门锁住之后利用人体红外传感器、称重传感器等传感器检测车内是否有误锁的幼儿，如果有则通过gsm模块发送报警短信，防止幼儿误锁车内。(When the door is locked, the infrared sensor, load cell and other sensors of human body are used to detect whether there is a child locked by mistake in the car. If there is, the alarm message is sent through the GSM module to prevent the child from locking the car by mistak)