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Microprocessor based over/under speed governor

  • US 4,495,578 A
  • Filed: 10/22/1981
  • Issued: 01/22/1985
  • Est. Priority Date: 10/22/1981
  • Status: Expired due to Term
First Claim
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1. Vehicle carried control apparatus to control vehicle motion in the transition from a first speed limit to a second, lower, speed limit, comprising:

  • signal receiving means for receiving and registering wayside imposed speed limits,vehicle speed measuring means for producing a signal representative of vehicle speed,governor means responsive to said signal receiving means and to said vehicle speed measuring means for imposing a braking force or a requirement for a braking operation on said vehicle if said vehicle speed is greater than said wayside imposed speed limit,wherein the improvement comprises;

    speed profile generating means responsive to said signal receiving means receiving a second speed limit at a time when a first higher speed limit had been effective to generate a speed limit profile, monotonically decreasing from said first toward said second speed limit, andmeans to withhold application of said braking force or requirement so long as said speed limit profile is generated and said vehicle speed is less than a current value of said speed limit profile.

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