Abstract:
A method for determining a state of health (SOH) value for an electric power steering (EPS) system in a vehicle includes estimating a first Self-Aligning Torque (SAT) value using a tire dynamics model, which includes modeled dynamics in the linear region of a lateral force acting on the vehicle tires. The method also includes estimating a second SAT value using an extended state observer and nominal parameters for the EPS system, and calculating a variance between the first and second SAT values. The controller monitors a progression of the calculated variance over a calibrated interval using the controller to thereby determine the SOH value, and automatically executes a control action using the SOH value. An EPS system for a vehicle includes a steering wheel, torque and angle sensors, a rack and pinion assembly, a steering motor, and the controller. A vehicle is also disclosed having the same controller.
Abstract:
A method to control a vehicle including control of regenerative brakes and friction brakes includes monitoring a desired corner force and moment distribution, monitoring real-time actuator constraints including a braking torque limit of each of the regenerative brake, determining a regenerative braking torque for each of the regenerative brakes based upon the desired corner force and moment distribution and the real-time actuator constraints, determining a friction braking torque for each of the friction brakes based upon the desired corner force and moment distribution and the determined regenerative braking torque for each of the regenerative brakes, and controlling the vehicle based upon the determined regenerative braking torques and the determined friction braking torques.
Abstract:
An active front wheel steering control system for a vehicle that includes a first control sub-system that provides AFS oversteer control to control the angle of the front wheels during an oversteer condition, and a second control sub-system that provides AFS understeer control to control the angle of the front wheels during an understeer condition. A controller monitors a first parameter as an oversteer flag associated with the first control sub-system and a second parameter as an understeer flag associated with the second control sub-system.
Abstract:
A vehicle includes a plurality of sub-systems and corresponding controllers for effecting normal control thereover. The vehicle further includes a vehicle dynamics controller for providing high-priority sub-system commands for sub-system control to effect vehicle dynamics enhancements. The vehicle dynamics controller includes a plurality of independently decomposable and recomposable software components or layers and accessible inter-layer bus structure.
Abstract:
A method for isolating an actual sensor bias in a fuel delivery system having a fuel pump includes monitoring first, second and third fuel pump parameters, detecting first and second fuel pump sensor biases based on the monitored first, second and third fuel pump parameters, modeling a fourth fuel pump modeled parameter based on the monitored second and third fuel pump parameters, and isolating the actual sensor bias in one of the detected first and second fuel pump biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter.
Abstract:
A method for allocating forces among the corners of a vehicle having a redundant actuator suite includes determining a set of desired forces at the center of gravity of the vehicle, and allocating the set of desired forces among the corners of the vehicle as virtual control commands using a controller. The method also includes mapping the virtual control commands at the corners to actual or true control commands at the corners, and controlling a plurality of actuators at the corners using the actual or true control commands. The actuators may include friction brakes and wheel motors. Mapping the virtual control commands may include using a Least Squares formulation. Control of the actuators may be prioritized with respect to each other using weighting matrices. A vehicle includes a controller having actuators and a controller configured for executing the above method.
Abstract:
A method for determining a state of health (SOH) value for a fuel delivery system in a vehicle includes estimating speeds of a calibrated fuel pump and an actual fuel pump using an extended state observer, calculating a deviation between the estimated speeds, and determining the progress of the deviation over a calibrated interval. The method further includes calculating the SOH value using the progress of the deviation, and automatically executing a control action corresponding to the SOH value. The system may be an Electronic Returnless Fuel System, and the pump may be controlled using pulse width modulation. A fuel delivery system for a vehicle includes a fuel pump operable for supplying fuel to the engine, a fuel tank containing the fuel pump, and a controller having the state observer noted above. A vehicle includes the fuel system, engine, and controller noted above.
Abstract:
A method for determining a state of health (SOH) value for a fuel delivery system in a vehicle includes estimating speeds of a calibrated fuel pump and an actual fuel pump using an extended state observer, calculating a deviation between the estimated speeds, and determining the progress of the deviation over a calibrated interval. The method further includes calculating the SOH value using the progress of the deviation, and automatically executing a control action corresponding to the SOH value. The system may be an Electronic Returnless Fuel System, and the pump may be controlled using pulse width modulation. A fuel delivery system for a vehicle includes a fuel pump operable for supplying fuel to the engine, a fuel tank containing the fuel pump, and a controller having the state observer noted above. A vehicle includes the fuel system, engine, and controller noted above.
Abstract:
A controller of an active rear steering (ARS) control system includes a processor and a software module. The software module includes instructions that, when executed by the processor, cause the processor to determine rear steering angles, determine a vehicle state, determine shaping functions, and determine a rear steering command.
Abstract:
A control system for warning a following vehicle of a potential collision with a leading vehicle. The leading vehicle includes a detection system for detecting the presence and velocity of the following vehicle. The control system determines a desired distance between the leading vehicle and the following vehicle based on the speed of the leading vehicle. The control system subtracts the desired distance from the actual distance to generate a distance error signal, and compares the distance error signal to a threshold. If the error signal is greater than the threshold, the control system may provide one or more operations, such as flashing hazard lights to warn the following vehicle, or taking other course of action in the event of an imminent collision, such as pre-tensioning seat belts and closing windows of the leading vehicle.