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

• Current Assignee: Hiroshi Fujinami, Hisato Wakamatsu, Tokuhiro Kurebayashi
• Original Assignee: Hiroshi Fujinami, Hisato Wakamatsu, Tokuhiro Kurebayashi
• Inventors: Kurebayashi, Tokuhiro, Wakamatsu, Hisato, Fujinami, Hiroshi
• Primary Examiner(s): McKeon, Arthur T.
• Application Number:
  US05/164,316
• Time in Patent Office: 637 Days
• Field of Search: 74/866
• US Class Current: 477/131
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 61/686 with orbital gears

Abstract

A system for shifting the gear positions of an automatic transmission for a vehicle at a plurality of predetermined shift points in which an r.p.m. detecting a.c. generator is connected to the wheel driving system and the output from the AC generator is converted into a pulse signal. The number of pulses appearing within unit time is counted and the count is classified to obtain a plurality of digital vehicle speed signals corresponding to a plurality of vehicle speed settings. The accelerator pedal is connected to a movable contact of a multi-contact switch having a plurality of stationary contacts so as to obtain a plurality of digital throttle position signals representative of various positions of the accelerator pedal. The digital vehicle speed signal and digital throttle position signal are applied to a logic circuit to obtain a shift signal.

Claims

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.