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Torque security of MPC-based powertrain control

  • US 10,125,712 B2
  • Filed: 02/17/2017
  • Issued: 11/13/2018
  • Est. Priority Date: 02/17/2017
  • Status: Active Grant
First Claim
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1. A method for controlling a propulsion system of a motor vehicle, the method comprising:

  • determining an initial selected engine output torque value using a model predictive control system;

    determining at least one of a first minimum acceptable engine output torque and a second minimum acceptable engine output torque, the first minimum acceptable engine output torque being based on an engine output torque requested and a predetermined engine output torque minimum constant, and the second minimum acceptable engine output torque being based on an axle torque requested and a predetermined axle torque minimum constant;

    determining a minimum torque limit by selecting one of the first and second minimum acceptable engine output torques;

    determining whether the initial selected engine output torque value is less than the minimum torque limit;

    if the initial selected engine output torque value is less than the minimum torque limit, setting a desired engine output torque value as the minimum torque limit;

    determining at least one of a first maximum acceptable engine output torque and a second maximum acceptable engine output torque, the first maximum acceptable engine output torque being based on the engine output torque requested and a predetermined engine output torque maximum constant, and the second maximum acceptable engine output torque being based on the axle torque requested and a predetermined axle torque maximum constant;

    determining a maximum torque limit by selecting one of the first and second maximum acceptable engine output torques;

    determining whether the initial selected engine output torque value is greater than the maximum torque limit;

    if the initial selected engine output torque value is greater than the maximum torque limit, setting the desired engine output torque value as the maximum torque limit; and

    if the initial selected engine output torque value is neither greater than the maximum torque limit nor less than the minimum torque limit, setting the desired engine output torque value as the initial selected engine output torque value.

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