Lock-up control and method thereof

  • US 4,582,182 A
  • Filed: 10/05/1984
  • Issued: 04/15/1986
  • Est. Priority Date: 10/07/1983
  • Status: Expired due to Term
First Claim
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1. A lock-up control system for a lock-up type automatic transmission for a vehicle having an engine, the automatic transmission including a lock-up type torque converter having an input element drivingly connected to the engine, an output element and a bridge clutch which, when engaged, mechanically interconnects the input element and the output element, said lock-up control system, comprising:

  • means for detecting a command for shifting in the automatic transmission and generating a shifting command indicative signal;

    means responsive to said shifting command indicative signal for temporarily releasing engagement of the bridge clutch;

    means for estimating an engine revolution speed after an instant when the bridge clutch is temporarily released and generating an estimated engine revolution speed indicative signal;

    means for detecting an actual engine revolution speed and generating an actual engine revolution speed indicative signal;

    means for integrating a difference between said estimated engine revolution speed indicative signal and said actual engine revolution speed indicative signal to give an integral value and generating an integral value indicative signal; and

    means for determining said instant in such a manner as to decrease a difference between said integral value and a predetermined value.

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