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Failure mode effects mitigation in drive-by-wire systems

  • US 8,234,045 B2
  • Filed: 09/24/2008
  • Issued: 07/31/2012
  • Est. Priority Date: 09/24/2008
  • Status: Expired due to Fees
First Claim
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1. A steer-by-wire failure mode mitigation system for a vehicle, the system comprising:

  • a driver input device configured to receive a steering input from a driver of the vehicle;

    a detector configured to detect the steering input and to output a signal representative of the steering input;

    a first control device;

    a second control device that is different than the first control device;

    a third control device that is different than the first control device and the second control device;

    a controller configured to operate in either a first operational mode or a failure mode, the controller coupled to the detector, the first control device, the second control device, and the third control device, the controller configured todetermine whether the first, second, and third control devices are functioning properly,operate in the failure mode if one or more of the control devices are functioning improperly, and, while in the failure mode, send command input signals only to those control devices that are functioning properly to control and monitor those control devices;

    a first actuator coupled to the first control device, the first control device configured to receive a first command input signal from the controller, when the controller is in the first operational mode, generate a first control signal representative of the steering input, and transmit the first control signal to the first actuator;

    wherein the first actuator is configured to generate a first mechanical output to alter a direction of a first wheel and a second wheel;

    a second actuator coupled to the second control device, the second control device configured to receive the first command input signal from the controller, when the controller is in the failure mode, generate a second control signal representative of the steering input, and transmit the second control signal to the second actuator;

    wherein the second actuator is configured to generate a second mechanical output to exert a first force on the first wheel in a first direction; and

    a third actuator coupled to the third control device, the third control device configured to receive the first command input signal from the controller, when the controller is in the failure mode, generate a third control signal representative of the steering input, and transmit the third control signal to the third actuator;

    wherein the third actuator is configured to generate a third mechanical output to exert a second force on the second wheel in a second direction.

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