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Retarder brake automatic control system

  • US 4,485,444 A
  • Filed: 12/01/1981
  • Issued: 11/27/1984
  • Est. Priority Date: 12/04/1980
  • Status: Expired due to Fees
First Claim
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1. A retarder brake automatic control system for causing a vehicle, having an automatic transmission controller for automatically shifting transmission stages corresponding to the speed of the vehicle, to run downhill at a set speed by driving a retarder brake based on a set speed command which is set by speed setting means when the vehicle runs downhill using an engine brake, said system comprising:

  • fault detecting means for detecting abnormality in at least one predetermined engine parameter during downhill operation of the vehicle, andtemporary set speed command generating means for generating a temporary set speed command corresponding to a transmission stage which is one stage lower than the transmission stage of said automatic transmission controller corresponding to the set speed command, causing said retarder brake to be driven based on the temporary set speed command in place of the set speed command at the time of fault detection when an abnormality is detected by said fault detecting means.

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