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    • 5. 发明申请
    • RFID buckle closure and presence sensor system for safety childseat
    • 用于安全儿童座椅的RFID扣环闭合和存在传感器系统
    • US20070096891A1
    • 2007-05-03
    • US11581884
    • 2006-10-17
    • Michael SheriffEthan Funk
    • Michael SheriffEthan Funk
    • B60Q1/00
    • B60N2/002B60N2/2812B60R21/01556B60R22/48B60R2022/4816B60R2022/4858B60R2022/4866
    • In the preferred embodiment of the present invention a passive, wireless, RFID-based wireless buckle-closure sensor determines whether the buckle of a child safety seat is secured. Sensors also are provided to determine if the child is in the seat, the temperature and if the vehicle is in operation, and alarms are sounded if an unsafe condition is detected by the system. Child safety seats utilize a 3-point or 5-point locking-mechanism for seat belt and harness restraints. The locking-mechanism requires that metal belt/harness components latch together and are released by depression of a lock-mounted release button. In the preferred embodiment of the present invention a passive RF transponder is affixed to the buckle. Essentially the RF transponder comprises an RFID device without a data component. The RF transponder is interrogated by a frequency-scanning reader, which determines the resonant frequency of the transponder. The resonant frequency of the transponder is affected by the presence of the metal fittings local to the RF transponder. Thus, since the major components of the buckle and latch are metal, the detection of the change in the resonant frequency of the transponder, also referred to as “detuning,” permits the determination of the state of the belt/harness buckle—latched or unlatched. This sensing is wireless, unobtrusive, and requires only a passive component be attached to the buckle. Further disclosed is a method of determining the status of a child in a child safety seat, including: whether or not a child is in the seat, whether or not the belt/harness buckle is latched, whether the vehicle's engine is in operation, and whether or not the surrounding temperature exceeds the temperature range. If an unsafe condition is detected, an alarm is activated.
    • 在本发明的优选实施例中,无源的,无线的基于RFID的无线扣环传感器确定儿童安全座椅的带扣是否被固定。 还提供传感器以确定儿童是否在座位,温度以及车辆是否正在运行,并且如果系统检测到不安全的状况,则会发出警报声。 儿童安全座椅使用安全带和线束约束装置的3点或5点锁定机构。 锁定机构要求金属皮带/线束组件锁定在一起,并通过按下锁定的释放按钮释放。 在本发明的优选实施例中,无源RF应答器被固定到带扣上。 基本上,RF转发器包括没有数据组件的RFID设备。 RF转发器由频率扫描读取器询问,该读取器确定应答器的谐振频率。 应答器的谐振频率受到RF应答器本地的金属配件的影响。 因此,由于扣环和闩锁的主要部件是金属,所以对转发器的谐振频率变化的检测(也称为“失谐”)允许确定带/线束带扣或锁定的状态 解锁 该感测是无线的,不引人注意的,并且仅需要将被动部件附接到带扣。 还公开了一种确定儿童安全座椅中的儿童的状态的方法,包括:儿童是否在座椅中,无论皮带/线束扣是否被闩锁,车辆发动机是否在运行,以及 周围温度是否超过温度范围。 如果检测到不安全的情况,则会启动报警。