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Method for the control of a transmission

  • US 6,503,171 B1
  • Filed: 10/10/2000
  • Issued: 01/07/2003
  • Est. Priority Date: 10/12/1999
  • Status: Expired due to Term
First Claim
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1. A method for controlling a transmission of an engine-driven vehicle having a plurality of gears, the vehicle including a service module actuable by a driver of the vehicle to select a desired gear, the service module being connected to a transmission control system which automatically changes gears in response to an actuation of the service module, said vehicle further including an engine braking system connected to said transmission control system which is actuable to brake the vehicle engine during a gear change, the method comprising:

  • monitoring a transmission input rotational speed (NE) and a transmission output rotational speed (NA);

    calculating a synchronous rotational speed (NS) of the desired gear;

    actuating said engine braking system to reduce the transmission input rotational speed (NE);

    determining a switch-off threshold for disabling said engine braking system at a point in time before an expected synchronization of the rotational speeds (NE) and (NS) occurs;

    disabling said engine braking system when said predetermined switch-off threshold is reached; and

    synchronizing said transmission input rotational speed (NE) with said synchronous rotational speed (NS) so that said gear change can be effected, wherein said predetermined switch-off threshold is a predetermined rotational differential value (DA) between the rotational speeds (NE) and (NS), wherein said predetermined speed differential value (DA) is determined according to the equation;

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