CN105946763B - 一种基于多参数决策的汽车侧气囊实施方法 - Google Patents
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- B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
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Abstract
本发明公开了一种基于多参数决策的汽车侧气囊实施方法,以解决现有基于单一参数进行起爆决策的侧气囊实施方法不能准确地控制气囊起爆的问题,通过个车轮轮速、是否有乘客、该乘客是否佩带安全带的信息和车辆侧向加速度共同判断决策出不同碰撞强度和侧翻情况下输出的气囊起爆控制指令。执行单元接收到控制单元发送的指令后,执行起爆气囊动作。本发明利用车辆已有传感器因此容易实施,通过多参数决策提高了决策的准确性和可靠性。本发明方法还考虑了侧向碰撞的强度等级,从而更精确地控制气囊起爆。
Description
技术领域
本发明涉及一种基于多参数决策的汽车侧气囊实施方法。
背景技术
安全气囊可以有效地保护乘员,使其免受或减轻碰撞伤害,而侧气囊一般安装在座椅外侧,在车辆发生剧烈的侧方撞击时,快速地形成一个充气饱满的气袋,使乘员在惯性力的作用下撞击在气袋上,避免躯干与内饰件直接接触,减缓侧面撞击造成的伤害。
现有的侧气囊实施方法中,大都是利用单一参数进行起爆决策,如加速度阈值法,速度变量法等。这种基于单一参数的决策方法不能准确地控制气囊起爆。理想的气囊控制方法包括两个方面的含义:低误爆率和低漏爆率。为了降低气囊误爆率,目前的做法是设置较苛刻的气囊起爆条件,这样就导致气囊漏爆率的上升,不解决好气囊误爆和漏爆的矛盾,将严重地影响气囊的使用价值。所以开发出一种高准确性的气囊实施方法显得尤为重要。
发明内容
为了解决现有基于单一参数进行起爆决策的侧气囊实施方法不能准确地控制气囊起爆的问题,本发明提出了一种基于多参数决策的汽车侧气囊实施方法。
一种基于多参数决策的侧气囊实施方法,包括如下步骤:
第一步,通过感知单元获取数据
通过轮速传感器获取车辆各轮速信号;
通过布置在座垫上的压力传感器获取座椅上是否有乘客的信息;
通过布置在安全带卡扣上的触发开关获取该乘客是否佩带安全带的信息;
通过加速度传感器获取车辆侧向加速度。
第二步,气囊起爆决策
依据第一步获取的数据,控制单元进行分析计算,判断车辆的运动状态是否为侧面碰撞或侧翻;
判断为侧翻时,车辆侧向加速度应大于a0且小于等于a1,同时左右轮速不相等;
判断为侧面碰撞时,车辆侧向加速度应大于a1,同时左右轮速相等;
通常,a0的范围是g-3g,a1的范围是5g-15g;
并根据车辆侧向加速度大小对碰撞强度进行分级,碰撞强度分级的具体分级如下:
碰撞强度为碰撞时,车辆侧向加速度小于等于a2;
碰撞强度为剧烈碰撞时,车辆侧向加速度大于a2;通常,a2的范围是10g-30g
第三步,气囊起爆
依据第二步的决策结果,得到是否起爆和气囊起爆时间的控制指令;执行单元接收到控制单元发送的指令后,执行起爆气囊动作。
如果决策结果为侧面碰撞,根据侧向加速度方向判断车辆是哪侧受到撞击,侧向加速度向右,则判定为左侧受到撞击,反之为右侧受到撞击,控制受到撞击一侧的侧气囊快速充气打开,决策单元根据感知单元得到的座椅上是否有乘客的信息,控制只起爆有乘员且发生碰撞的一侧;根据碰撞强度分级和该乘客是否佩带安全带的信息确定起爆时间:
1)当碰撞强度为碰撞时,该乘客已佩带安全带,则延迟0~20毫秒后起爆气囊;
2)当碰撞强度为碰撞时,该乘客未佩带安全带,则立即起爆气囊;
3)当碰撞强度为剧烈碰撞时,则立即起爆气囊;
如果决策结果为车辆将要发生翻转,则控制有乘员侧的侧气囊立即起爆,充气打开。
本发明同现有技术相比,具有如下优点:
1、本发明综合考虑了车辆纵向速度,侧向加速度,乘员状态等参数进行气囊起爆决策,提高决策的准确性和可靠性;
2、本发明所使用的参数均为从车辆已有传感器或结构中获得,无需另加传感器,确保本发明容易实施;
3、本发明在控制气囊起爆时,考虑了侧向碰撞的强度等级,从而更精确地控制气囊起爆。气囊的起爆时刻是气囊控制的关键变量,起爆过晚则快速膨胀的气袋会对乘员造成伤害;起爆过早则起不到最好的保护作用。
附图说明
图1为本发明方法整体架构;
图2为本发明中传感器布置方案;
图3为本发明方法的流程图;图中关键参数a0,a1,a2,应用于不同车型时需通过试验标定得出。通常a0的范围是g-3g,a1的范围是5g-15g,a2的范围是10g-30g。
具体实施方式
下面结合说明书附图对本发明技术方案作进一步解释和说明,
实施例1
本发明方法基于如图1所述的架构实施,分别由感知单元、控制单元和执行单元,其中感知单元中的各传感器按照图2所示设置。
如图3所示,本发明中一种基于多参数决策的侧气囊实施方法具体步骤如下:
第一步,通过感知单元获取数据
通过轮速传感器获取车辆各轮速信号;
通过布置在座垫上的压力传感器获取座椅上是否有乘客的信息;
通过布置在安全带卡扣上的触发开关获取该乘客是否佩带安全带的信息;
通过加速度传感器获取车辆侧向加速度。
第二步,气囊起爆决策
依据第一步获取的数据,控制单元进行分析计算,判断车辆的运动状态是否为侧面碰撞或侧翻;
判断为侧翻时,车辆侧向加速度应大于a0且小于等于a1,同时左右轮速不相等;
判断为侧面碰撞时,车辆侧向加速度应大于a1,同时左右轮速相等;
通常,a0的范围是g-3g,a1的范围是5g-15g;
并根据车辆侧向加速度大小对碰撞强度进行分级,碰撞强度分级的具体分级如下:
碰撞强度为碰撞时,车辆侧向加速度小于等于a2;
碰撞强度为剧烈碰撞时,车辆侧向加速度大于a2;通常,a2的范围是10g-30g
如果决策结果为侧面碰撞,根据侧向加速度方向判断车辆受撞击方向,侧向加速度向右,则判定为左侧受到双击,反之为右侧受到撞击,则控制受到撞击一侧的侧气囊快速充气打开,决策单元根据感知单元得到的座椅上是否有乘客的信息,控制只起爆有乘员且发生碰撞的一侧;根据碰撞强度分级和该乘客是否佩带安全带的信息确定起爆时间:
1)当碰撞强度为碰撞时,该乘客已佩带安全带,则延迟0~20毫秒后起爆气囊;
2)当碰撞强度为碰撞时,该乘客未佩带安全带,则立即起爆气囊;
3)当碰撞强度为剧烈碰撞时,则立即起爆气囊;
如果决策结果为车辆将要发生翻转,则控制有乘员侧的侧气囊立即起爆,充气打开。
控制单元将含有是否起爆和起爆的时刻的控制指令发送给执行单元。
步骤三、气囊起爆
执行单元接收到控制单元发送的指令后,执行相关动作。具体地,气体发生器根据控制指令中的起爆时刻引爆火药,高压气体从发生器一侧冲出进入气袋。随着大量高压气体进入气袋,气袋迅速膨胀扩大,并从撕裂口出冲破气囊保护套和座椅蒙皮,最终形成一个饱满的气袋,有效地保护乘员安全。
Claims (1)
1.一种基于多参数决策的侧气囊实施方法,包括如下步骤:
第一步,通过感知单元获取数据
通过轮速传感器获取车辆各轮速信号;
通过布置在座垫上的压力传感器获取座椅上是否有乘客的信息;
通过布置在安全带卡扣上的触发开关获取该乘客是否佩带安全带的信息;
通过加速度传感器获取车辆侧向加速度;
第二步,气囊起爆决策
依据第一步获取的数据,控制单元进行分析计算,判断车辆的运动状态是否为侧面碰撞或侧翻;
判断为侧翻时,车辆侧向加速度应大于a0且小于等于a1,同时左右轮速不相等;
判断为侧面碰撞时,车辆侧向加速度应大于a1,同时左右轮速相等;
a0为g-3g,a1为5g-15g;
并根据车辆侧向加速度大小对碰撞强度进行分级,碰撞强度分级的具体分级如下:
碰撞强度为碰撞时,车辆侧向加速度小于等于a2;
碰撞强度为剧烈碰撞时,车辆侧向加速度大于a2;a2为10g-30g;
第三步,气囊起爆
依据第二步的决策结果,得到是否起爆和气囊起爆时间的控制指令,执行单元接收到控制单元发送的指令后,执行起爆气囊动作;
如果决策结果为侧面碰撞,根据侧向加速度方向判断车辆是哪侧受到撞击,侧向加速度向右,则判定为左侧受到撞击,反之为右侧受到撞击;则控制受到撞击一侧的侧气囊快速充气打开,决策单元根据感知单元得到的座椅上是否有乘客的信息,控制只起爆有乘员且发生碰撞的一侧;根据碰撞强度分级和该乘客是否佩带安全带的信息确定起爆时间:
1)当碰撞强度为碰撞时,该乘客已佩带安全带,则延迟0~20毫秒后起爆气囊;
2)当碰撞强度为碰撞时,该乘客未佩带安全带,则立即起爆气囊;
3)当碰撞强度为剧烈碰撞时,则立即起爆气囊;
如果决策结果为车辆将要发生侧翻,则控制有乘员侧的侧气囊立即起爆,充气打开。
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