CN104730276B - 轮速度预处理装置及方法 - Google Patents
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Abstract
本发明涉及轮速度预处理装置及利用其的轮速度预处理方法,其中轮速度预处理装置,包括:转速脉冲轮,其具有多个齿;霍尔传感器,其感应包括所述各个齿的偏移的测量角;偏移修正部,其在发生外部干扰时,在所述测量角修正偏移(corrective offset),所述修正偏移为所述偏移总和除以所述齿个数;及频率推测部,其基于从所述偏移修正部计算的结果值来推测频率。据此,在发生外部干扰时,利用修正偏移提高推测频率的准确度。
Description
技术领域
本发明涉及轮速度预处理方法,更详细地说本发明涉及的轮速度预处理方法,从在轮速度传感器产生的信号推测轮胎气压时,修正根据外部干扰产生的轮传感器感应误差,提高推测频率的准确度。
背景技术
最近,在车辆安装感应轮胎压力感应系统(TPMS,Tire Pressure MonitoringSystem),检测安装在车辆的轮胎的空气压下降,并提醒驾驶员。
若轮胎的气压低,则车辆易于打滑存在导致大型事故的可能性,并且燃料消耗量多燃料费增加,不仅缩短轮胎寿命,还大大降低乘车感与制动力。
轮胎压力感应系统(TPMS),将轮胎压力的下降提醒驾驶员,进而检测轮胎压力状态,可在事前预防这种问题。
TPMS区分为直接方式的TPMS(direct Tire Pressure Monitoring System,直接轮胎压力检测系统)与间接方式的TPMS(direct Tire Pressure Monitoring System),其中直接方式的TPMS(direct Tire Pressure Monitoring System)直接测量轮胎压力的减少,间接方式的TPMS(direct Tire Pressure Monitoring System,间接轮胎压力检测系统)利用轮速度间接测量轮胎压力的减少。
直接方式的TPMS,附着在轮胎的压力传感器将轮胎的气压变化告知驾驶员。间接方式的TPMS,通过在气压下降时产生的轮胎响应特性(例如,旋转速度或旋转速度的频率特性)变化,间接推测轮胎气压变化,并将此变化告知驾驶员。
间接方式的TPMS,其还可分类为动态加载半径(Dynamic Loaded Radius,DLR)分析方式与谐振频率(Resonance Frequency Method,RFM)分析方式,分别简称为半径分析及频率分析。
频率分析,若轮胎的气压下降,则利用车轮旋转速度信号的频率特性变化,检测与正常气压轮胎的差异的方式。在频率分析中,关注根据车辆旋转速度信号的频率分析可求得的谐振频率,若计算的该谐振频率低于在初始化时推测的基准频率,则判断轮胎气压下降。
半径分析方式为,在气压下降的轮胎行驶时,动态负载半径变小,其结果利用快于正常气压的轮胎的旋转现象,比较4个轮胎的旋转速度,进而检测气压下降(参照日本公开专利第1988-0355011)。
但是,直接方式TPMS还需要为了测量轮胎压力的追加性零部件,进而其构成复杂,并且存在制造费用增加的问题,因此使用间接方式的TPMS。
尤其是,间接方式的TPMS主要从ABS(Anti-lock Braking System,防抱死制动系统)或ECS(Electronic Controlled Suspension,电控悬架)的轮传感器信号推测轮胎气压。
所述ABS或所述ECS的轮传感器,使用转速脉冲轮(tonewhleel)与霍尔传感器生成速度信号。转速脉冲轮为以烧结方式生成的机械构造物,普通旋转一圈时具有47~49个左右的齿(Tooth)。
参照图1,所述齿之间的理想角度(ideal angle)可由2π/N求得,在这里N是齿的总个数。
但是,在实际上因加工误差等,所述齿之间的测量角(measurement angle)为在所述理想角加误差角(Angle Error),即可由测量角与理想角的差异求误差角。
但是,就算包括误差角,转速脉冲轮旋转1圈的转速脉冲轮角度固定为360度,若将对旋转一圈的各个角度误差相加则成为0。
但是,如图2所示在测量角度时,若施加如同测量误差或机械性冲击等外部干扰,则角度误差之和就不是0,这种情况使得在推测频率时,根据外部干扰无法正确推测频率。
据此,由于轮传感器测量的值不正确,因此存在很难正确推测轮胎气压的问题。
(现有技术文献)
韩国注册专利第10-1334233号
发明内容
(要解决的问题)
本发明为了解决上述问题,提供轮速度预处理装置及方法的目的在于,在发生外部干扰时,减少被轮传感器感应而传输的速度信号的齿误差,进而可提高推测频率的准确度。
(解决问题的手段)
根据本发明的轮速度预处理装置达成上述目的,其包括:转速脉冲轮,其具有多个齿;霍尔传感器,其感应包括所述各个齿的偏移的测量角;偏移修正部,其在发生外部干扰时,在所述测量角修正偏移;及频率推测部,其基于从所述偏移修正部计算的结果值推测频率,根据所述偏移总和除以所述齿个数的数学式求所述修正偏移。
另外,根据本发明的轮速度预处理方法达成上述目的,其包括:a)利用霍尔传感器感应转速脉冲轮的齿,获取包括偏移的测量角的步骤;(b)在发生外部干扰时,计算修正偏移的步骤;(c)利用计算的所述修正偏移,修正所述测量角的步骤;基于在所述(c)步骤计算的结果值来推测频率的步骤。
在这里,根据如下数学式求所述修正偏移,所述数学式为所述偏移总和除以所述齿个数。
(发明的效果)
根据具有上述构成的本发明优选一实施例,轮速度预处理装置及方法,在发生外部干扰时,利用偏移修正提高推测频率的准确度。
即,将根据外部干扰发生的偏移除以所述齿的总个数之后,分别加减于所述各个齿的测量角,进而提高推测频率的准确度。
附图说明
图1是图示转速脉冲轮的各个齿的理想角度的图面。
图2是图示根据有无误差角的轮为相同角速度时,频率推测结果的图面。
图3及图4是根据本发明优选一实施例,图示轮速度预处理装置的图面。
图5是根据本发明优选一实施例,图示轮速度预处理装置的转速脉冲轮的理想情况(ideal case)的图面。
图6是根据本发明优选一实施例,图示轮速度预处理装置的转速脉冲轮的真实情况(real case)的图面。
图7是根据本发明优选一实施例,图示轮速度预处理装置修正偏移的修正前、后的图面。
图8是根据本发明优选一实施例,图示轮速度预处理方法的图面。(附图标记说明)
1:轮速度预处理装置 30:转速脉冲轮
40:霍尔传感器 40:偏移修正部
50:频率推测部
具体实施方法
以下,为了明确关于本发明技术问题的解决方案,参照附图详细说明本发明优选实施例。只是,在本发明的说明中,在关于相关公知技术的说明反而使本发明的要点不清楚的情况,将省略关于其的说明。另外,后述的用语是考虑在本发明中的功能而定义的用语,这根据设计者、制造者等的意图或惯例不同。因此其定义是基于本说明书整体内容为基础而决定的,另外在说明书整体内容中,以相同图面符号(参照符号)表示部分县市相同的要素。
以下,根据本发明优选一实施例,说明轮速度预处理装置及方法。
如图3所示,车辆可包括轮盘20,轮盘20安装在结合于车轮(未图示)的轮毂10,与轮毂10一起旋转。在这里,轮盘20的内板21与外板22根据在其之间形成放射状的肋条23形成一体。
然后,所述车辆,可包括:转速脉冲轮30,其结合于贯通轮盘20的轮轴11,在旋转轮盘20时一起旋转;霍尔传感器40,其接近设置在转速脉冲轮30,感应转速脉冲轮30生成速度信号。
在这里,转速脉冲轮30形成为具有在圆盘形状的外周面由多个齿31(Tooth)与凹陷32构成的锯齿形状反复形成的外观。
然后,霍尔传感器40利用根据转速脉冲轮30的旋转生成的频率,生成速度信号。
根据本发明优选一实施例的轮速度预处理装置,如图3及图4所示可包括转速脉冲轮30、霍尔传感器40、偏移修正部50及频率推测部60。
参照图5,制备4个齿31的转速脉冲轮30的情况,在旋转1次时整体角度为4X,在这里X为齿31之间的理想角(ideal angle),还有在图5以假想线L为基准图示所述X。
但是,参照图6实际上各个转速脉冲轮31的情况,感应测量角(measurementangle)的X1=X+offset1+offset2、X2=X-offset2、X3=X-offset3及X4=X+offset3-offset1,即在各个齿31之间可存在偏移(Offset)。
但是,因为是X1+X2+X3+X4=4X,因此如图5所示在旋转1次时具有相同的整体角。
据此,如下数学式1偏移总和除以齿31的个数(N:Number of teeth),可求得修正偏移(corrective offset)。
(数学式1)
因此,在没有根据外部干扰的歪曲的情况,所述修正偏移的值为0。
但是,在存在修正偏移的值的情况,判断这是受到外部干扰的影响,进而以修正偏移修正误差角(Angle Error)。
即,所述轮速度预处理装置1的偏移修正部50,在根据外部干扰无法正确推测频率的情况,以修正偏移来修正误差角(Angle Error)从而推测频率。
参照图7进行更加详细说明,如图7(a)所示若发生外部干扰(A),则修正偏移(corrective offset)获取的值不是0。
据此,偏移修正部50如图7(b)所示在测量角加上计算的所述修正偏移,进而提高推测频率的准确度。
即,根据外部干扰发生的偏移除以齿31的总个数之后,加减于各个齿31的测量值,提高推测频率的准确度。
另一方面,频率推测部60通过包括所述修正偏移的结果值的信号,可推测提高准确度的频率。
本发明在转速脉冲轮30形成4个齿31为其示例,但是无需必须限定于此,并且在转速脉冲轮30与个数无关可形成多个齿31。
以下,参照图8说明根据本发明优选一实施例的轮速度预处理装置的方法S1。
根据本发明优选一实施例,轮速度预处理装置的方法S1,包括:利用霍尔传感器感应转速脉冲轮30的齿31,获取包括偏移的测量角的步骤S10;在发生外部干扰时计算修正偏移的步骤S20;利用计算的所述修正偏移,修正所述测量角的步骤S30;及基于在所述S30步骤计算的结果值来推测频率的步骤S40。
利用霍尔传感器感应转速脉冲轮的齿,来获取包括偏移的测量角的步骤S10中,利用霍尔传感器40感应转速脉冲轮30的齿31,如图6所示感应包括偏移的测量角X1、X2、X3、X4。
在发生外部干扰时计算修正偏移的步骤S20,根据所述偏移的总和除以所述齿个数的所述数学式1的数学式,计算所述修正的偏移。即,根据外部干扰所述偏移的总和获取的值不是0,据此获取根据所述数学式1计算的所述修正偏移。
利用计算的所述修正偏移来修正所述测量角的步骤S30,与基于在所述S30步骤计算的结果值推测频率的步骤S40,利用在各个齿31的测量角计算的所述修正偏移进行修正,利用以此为基础计算的结果值,提高推测频率准确度。
以上的说明不过是示例性的说明了本发明,在本发明所属的技术领域具有通常知识的技术人员,在不超出本发明本质性特性的范围内,可进行多样的修改、变更及替换。因此在本发明公开的实施例及附图不是为了限定本发明,而是为了说明本发明。不得根据这种实施例及附图限定本发明的技术思想,本发明的保护范围应被以下的请求范围解释,在与其同等范围的所有技术思想,应解释为包括在本发明的权利范围。
Claims (3)
1.一种轮速度预处理装置,其特征在于,包括:
转速脉冲轮,其具有多个齿;
霍尔传感器,其感应包括所述各个齿的偏移的测量角;
偏移修正部,其在发生外部干扰时,在所述测量角修正偏移;及
频率推测部,其基于从所述偏移修正部计算的结果值推测频率,
根据如下数学式求所述修正偏移,所述数学式为所述偏移总和除以所述齿个数,
其中,所述偏移修正部从各个所述齿的所述测量角中减去所述修正偏移或者在各个所述齿的所述测量角加上所述修正偏移。
2.一种轮速度预处理方法,其特征在于,包括:
(a)利用霍尔传感器感应转速脉冲轮的齿,获取包括偏移的测量角的步骤;
(b)在发生外部干扰时,计算修正偏移的步骤;
(c)利用计算的所述修正偏移,修正所述测量角的步骤;及
基于在所述(c)步骤计算的结果值来推测频率的步骤,
其中,修正所述测量角的步骤包括从所述测量角中减去所述修正偏移或者在所述测量角加上所述修正偏移的步骤。
3.根据权利要求2所述的轮速度预处理方法,其特征在于,
根据如下数学式求所述修正偏移,所述数学式为所述偏移总和除以所述齿个数,
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