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1. 发明授权

US6039144A Apparatus and method for producing a desired return torque in a vehicle power steering system having a rotational steering position sensor 失效
标题翻译：在具有旋转转向位置传感器的车辆动力转向系统中产生期望的返回转矩的装置和方法
公开(公告)号：US6039144A
公开(公告)日：2000-03-21
申请号：US103602
申请日：1998-06-24
申请人： Ashok Chandy , Kathryn Lynn Pattok , Deepak Chhaya
发明人： Ashok Chandy , Kathryn Lynn Pattok , Deepak Chhaya
IPC分类号： B62D6/00 , B62D5/04 , B62D15/02
CPC分类号： B62D15/0245 , B62D5/0466
摘要： A vehicle power steering system has a steering shaft with a rotational position sensor providing signal rollover so that each sensor output indicates a plurality of potential absolute steering positions separated from each other by multiples of a rollover angle. Upon each initiation of vehicle operation, the system selects an absolute steering positions corresponding to an initial sensor output as an unadjusted steering position and repeatedly updates the unadjusted steering position in response to sensor output changes, including sensed rollover events. The system stores data dividing a two dimensional map of possible vehicle steering operating points defined by total steering torque and steering position into a first region of likely vehicle steering system operating points, a second region of unlikely steering system operating points indicating a revolution offset in a first direction, and a third region of unlikely steering system operating points indicating a revolution offset in an opposite direction. While a minimum vehicle velocity and, optionally, other enabling conditions exist, a vehicle steering operating point derived from sensed total steering torque, the updated unadjusted steering position and a revolution offset compared with the stored data; and the revolution offset is updated as indicated if the derived vehicle steering system operating point is within the second or third stored regions of steering system operating points. A second return torque command is derived from the updated unadjusted steering position and updated revolution offset and provided to the actuator to produce a second return torque, preferably after the revolution offset is walked incrementally to the updated value, with return torque provided in a single, correct direction only during the walk.
摘要翻译：车辆动力转向系统具有转向轴，该转向轴具有提供信号翻转的旋转位置传感器，使得每个传感器输出指示以相反角度彼此分离的多个潜在的绝对转向位置。在车辆操作的每次开始时，系统选择与初始传感器输出相对应的绝对转向位置作为未调整的转向位置，并且响应于包括感测到的翻转事件的传感器输出变化重复地更新未调整的转向位置。该系统将由总转向转矩和转向位置限定的可能的车辆转向操作点的二维图划分为可能的车辆转向系统操作点的第一区域的数据，指示转向偏移的不太可能的转向系统操作点的第二区域第一方向，以及指示相反方向的旋转偏移的不太可能的转向系统操作点的第三区域。虽然存在最小车辆速度和可选地其他使能条件，但是与所存储的数据相比，来自感测的总转向转矩，更新的未调整的转向位置和转差的导引操作点; 并且如果导出的车辆转向系统操作点在转向系统操作点的第二或第三存储区域内，则转向偏移被更新。从更新的未调整的转向位置和更新的旋转偏移导出第二返回转矩指令，并且提供给致动器以产生第二返回扭矩，优选地在旋转偏移以增量方式移动到更新值之后，以单个，正确的方向只有在步行。

2. 发明授权

US6050360A Apparatus and method for producing a desired return torque in a vehicle power steering system having a rotational steering position sensor 失效
标题翻译：在具有旋转转向位置传感器的车辆动力转向系统中产生期望的返回转矩的装置和方法
公开(公告)号：US6050360A
公开(公告)日：2000-04-18
申请号：US103603
申请日：1998-06-24
申请人： Kathryn Lynn Pattok , Deepak Chhaya , Ashok Chandy
发明人： Kathryn Lynn Pattok , Deepak Chhaya , Ashok Chandy
IPC分类号： B62D6/00 , B62D5/04 , B62D15/02 , B62D6/10
CPC分类号： B62D5/0466 , B62D15/0245
摘要： A vehicle power steering system has a steering shaft with a rotational position sensor providing signal rollover so that each sensor output indicates a plurality of potential absolute steering positions separated from each other by multiples of a rollover angle. Upon each initiation of vehicle operation, the system selects, as an unadjusted steering position, one of the plurality of absolute steering positions corresponding to an initial sensor output; and the system repeatedly updates the unadjusted steering position in response to sensor output changes, including sensed rollover events. The system repeatedly tests a set of revolution offsets with the updated unadjusted steering position and excludes any which indicate an out-of-range absolute steering position. The final remaining revolution offset is latched as the correct value. Preferably, a temporary value of revolution offset used with the unadjusted position during the testing provides a return or centering torque of zero; and, once the final value is latched, the temporary value is walked incrementally toward the final value, when the return torque value is in the correct centering direction, to avoid a sudden increase in return torque or a return torque in the wrong direction. The walk ends when (1) the temporary value of revolution offset reaches the final value or (2) the true value of steering position, derived from the final value of revolution offset and the unadjusted position, reaches center, whichever occurs first. Thereafter, the final value of revolution offset is used with the updated unadjusted value to determine the absolute value, and thus return torque.
摘要翻译：车辆动力转向系统具有转向轴，该转向轴具有提供信号翻转的旋转位置传感器，使得每个传感器输出指示以相反角度彼此分离的多个潜在的绝对转向位置。在车辆操作开始时，系统选择与初始传感器输出对应的多个绝对转向位置中的一个作为未调节的转向位置; 并且系统响应于包括感测到的翻转事件的传感器输出变化重复地更新未调整的转向位置。该系统用更新的未经调整的转向位置重复测试一组旋转偏移，并且排除任何指示超出范围的绝对转向位置的转向偏移。最后的剩余旋转偏移被锁定为正确的值。优选地，在测试期间与未调整位置一起使用的旋转偏移的临时值提供返回或定心转矩为零; 并且一旦最终值被锁定，当返回扭矩值处于正确的定心方向时，临时值逐渐向最终值行走，以避免在错误方向上的返回转矩或返回转矩的突然增加。当（1）旋转偏移的临时值达到最终值时，行走结束，或（2）从旋转偏移的最终值和未调整位置得到的转向位置的真实值到达中心，以先到者为准。此后，使用旋转偏移的最终值与更新的未调整值来确定绝对值，从而返回扭矩。

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