Tooth butt/buzz control method/system

  • US 5,099,711 A
  • Filed: 05/09/1991
  • Issued: 03/31/1992
  • Est. Priority Date: 05/09/1991
  • Status: Expired due to Term
First Claim
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1. A method for controlling shifting of an automated mechanical transmission system (12) of the type comprising a mechanical transmission (14) including a shift actuator (28), a fuel controlled engine (16), a nonpositive coupling (10) drivingly interposed the engine and the transmission, and a central control unit (50) effective to receive input signals indicative of the status of the transmission system including (i) signals indicative of the rotational speeds of transmission shafts (42, 44) and (ii) signals indicative of the positioning of transmission jaw clutch members (43) and to process same in accordance with logic rules to issue command output signals to a plurality of system actuators, including the shift actuator (28) and a nonpositive coupling actuator (38/40), said method including the steps, responsive to sensing a required shift from transmission neutral into a selected gear ratio, of causing the nonpositive coupling (10) to be disengaged, then causing the jaw clutch members (98a/b, 114a/b, 118a/b, 120a/b, 128a/b) associated with the selected gear ratio to rotate at a substantially synchronous speed and then causing said jaw clutch members to be continuously urged into positive engagement;

  • said method characterized by;

    continuing to sense the rotational speeds and relative axial positions of said jaw clutch members; and

    if, after a first period of time, said jaw clutch members continue to rotate at a substantially synchronous speed and do not move into an axial position indicative of positive jaw clutch engagement, determining that a tooth butt condition exists.

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