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Device for indicating speed levels for motor vehicles

  • US 4,101,870 A
  • Filed: 12/28/1976
  • Issued: 07/18/1978
  • Est. Priority Date: 01/21/1976
  • Status: Expired due to Term
First Claim
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1. Method of indicating operational conditions, including speed levels, in motor vehicles, comprising the steps of;

  • deriving from a speed of a vehicle a first signal indicative of the speed;

    determining whether danger factors are present and if so, driving from each an additional signal of a nature similar to a nature of the first signal and having a predetermined value, modulating each additional signal in accordance with safety factors dependent on characteristics of the vehicle and on characteristics of a driver for the vehicle;

    combining the first signal with the modulated additional signals to obtain a combined value;

    comparing the combined value with a pre-determined threshold; and

    actuating an alarm in response to the comparison, when the value compared with the threshold exceeds the threshold.

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