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Vehicle driver alertness apparatus monitoring steering wheel oscillations

  • US 4,017,843 A
  • Filed: 02/05/1976
  • Issued: 04/12/1977
  • Est. Priority Date: 02/07/1975
  • Status: Expired due to Term
First Claim
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1. A vehicle safety apparatus comprising:

  • means for detecting movements associated with the driving activity of a vehicle driver to produce a first signal in response to a predetermined number of said movements;

    means for producing a second signal when the interval between successive first signals is greater than a predetermined period of time;

    an integration circuit for producing a third signal of which the magnitude increases in response to the first signal and decreases in the presence of the second signal;

    means for producing a fourth signal when the magnitude of the third signal reaches a preset value; and

    a utilization circuit responsive to the fourth signal to alert the vehicle driver.

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