Apparatus for detecting rotational state of wheel
First Claim
1. An apparatus for detecting a rotational state of a wheel, comprising a rotating member to rotate together with the wheel, a detected portion provided at said rotating member, detecting means for detecting passage of said detected portion and outputting a detection signal, and rotational direction detecting means for detecting a rotational direction of the wheel, based on the output from said detecting means, said apparatus further comprising halt detecting means for detecting whether the wheel is in a halt or not, and restricting means for restricting a change of the rotational direction detected by the rotational direction detecting means, when said halt detecting means detects that the wheel is in a halt.
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Accused Products
Abstract
Provided is rotational-state-of-wheel detecting apparatus that can avoid output of an incorrect rotational direction during a halt of a wheel. In ECU 10, a signal input section 10a accurately detects wheel speeds and rotational directions of respective wheels 12, 14, 16, 18, and, based on the results, respective computers 10b, 10c, 10d execute ABS control, TC control, and VSC control. On this occasion, switching of the rotational direction is restricted with a computation result of wheel speed of zero, and it is thus feasible to prevent occurrence of a malfunction or state hunting being repetitive switching of signs, due to an external magnetic field during halts of the wheels 12, 14, 16, 18. This further optimizes the state control of a vehicle.
39 Citations
8 Claims
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1. An apparatus for detecting a rotational state of a wheel, comprising a rotating member to rotate together with the wheel, a detected portion provided at said rotating member, detecting means for detecting passage of said detected portion and outputting a detection signal, and rotational direction detecting means for detecting a rotational direction of the wheel, based on the output from said detecting means,
said apparatus further comprising halt detecting means for detecting whether the wheel is in a halt or not, and restricting means for restricting a change of the rotational direction detected by the rotational direction detecting means, when said halt detecting means detects that the wheel is in a halt.
Specification