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System for detecting frictional state of running road surface

  • US 5,758,305 A
  • Filed: 10/20/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 10/25/1994
  • Status: Expired due to Fees
First Claim
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1. A system for detecting a frictional state of a running road surface, having means for detecting vehicle deceleration from a rotational speed of a rotating member included in a power transmission path, wherein whether or not the running road surface is a low-friction road surface is detected on the basis of the vehicle deceleration during braking, comprising:

  • a braking detector;

    means for detecting tire lock;

    means for detecting-a state in which said vehicle deceleration during braking is greater than a predetermined value, and means for determining whether said detected state lasts for shorter than a predetermined time during a period extending from start of said braking until the detection of the tire lock; and

    low-friction road determination means for determining said running road surface as the low-friction road surface when said tire lock is detected and said state is determined to have lasted for shorter than the predetermined time during said period.

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