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Active driveline damping

  • US 5,669,354 A
  • Filed: 04/18/1996
  • Issued: 09/23/1997
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine torque control method for varying engine output torque to reduce undesirable speed variation of an engine having a plurality of cylinders, each cylinder undergoing a torque producing combustion event in each of repeated engine cycles, comprising the steps of:

  • identifying an engine speed variation operating condition; and

    varying the torque produced in engine cylinder combustion events to reduce engine speed variation when the engine speed variation operating condition is identified, by(a) determining a current engine operating angle;

    (b) estimating an undesirable engine speed variation at the current engine operating angle;

    (c) phase compensating the estimated engine speed variation from the determined current engine operating angle to the engine operating angle at a next cylinder combustion event;

    (d) calculating an engine cylinder output torque change value for the next cylinder combustion event as a predetermined function of the phase compensated engine speed change value; and

    (e) controlling the torque produced at the next cylinder combustion event in accordance with the calculated engine cylinder output torque change value.

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