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SYSTEM FOR SHIFTING GEAR POSITIONS OF AUTOMATIC TRANSMISSIONS FOR AUTOMOTIVE VEHICLES AT PREDETERMINED SHIFT POINTS

  • US 3,727,488 A
  • Filed: 07/20/1971
  • Issued: 04/17/1973
  • Est. Priority Date: 07/21/1970
  • Status: Expired due to Term
First Claim
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1. A system for shifting the gear position of an automatic transmission for an automotive vehicle at a plurality of predetermined shift points comprising means for producing a plurality of digital vehicle speed signals each representative of a vehicle speed lying within one of a plurality of vehicle speed ranges, means for producing a plurality of digital throttle position signals each representative of a throttle position among a plurality of throttle positions, a plurality of AND gates whose number is equal to the number of said digital throttle position signals, means for applying said digital vehicle speed signals and said digital throttle position signals to the corresponding one of said AND gates so as to derive respective outputs from said AND gates, an OR gate connected to said AND gates, a memory connected to said OR gate for storing the output from said OR gate, and means for applying the signal stored in said memory to actuating means for shifting the gear position of said automatic transmission.

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