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Driver workload-based vehicle stability enhancement system

  • US 7,996,130 B2
  • Filed: 04/19/2010
  • Issued: 08/09/2011
  • Est. Priority Date: 04/13/2006
  • Status: Expired due to Fees
First Claim
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1. A vehicle stability enhancement system configured to provide vehicle stability control for a vehicle, said system comprising:

  • a driver workload estimator configured to provide a driver workload estimation signal indicative of the workload of a driver driving the vehicle, wherein the driver workload estimator sets the driver workload estimation signal to a first value if the vehicle speed is below 5 mph, sets the driver workload estimation signal to a second value if the vehicle speed is greater than or equal to 5 mph and less than 20 mph and sets the driver workload estimation signal to a third value if the vehicle speed is greater than or equal to 20 mph, where the first value indicates a low driver workload, the second value indicates an average driver workload and the third value indicates a high driver workload;

    a command interpreter responsive to vehicle operation signals and the driver workload estimation signal, said command interpreter configured to generate a desired yaw rate signal and a desired side-slip signal, wherein said command interpreter includes a yaw rate command generator and a side-slip command generator, said yaw rate command generator including a first filter responsive to a steady-state yaw rate signal and using a damping ratio and a natural frequency to filter the steady-state yaw rate signal, said side-slip command generator including a second filter responsive to a steady-state side-slip signal and using the damping ratio and the natural frequency to filter the steady-state side-slip signal, said command interpreter further including a control command adaptation processor responsive to the driver workload estimation signal, where the control command adaptation processor changes the damping ratio and the natural frequency in the first and second filters depending on the driver workload estimation signal; and

    a feedback control processor responsive to the driver workload estimation signal, the desired yaw rate signal, the desired side-slip signal, a measured yaw rate signal and a measured side-slip signal, said feedback control processor configured to generate a stability control signal to control the vehicle.

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