Abstract:
Methods, systems, and vehicles are provided for determining an effective brake pedal position for a vehicle. A determination is made as to whether. automatic braking is occurring for a vehicle. If the automatic braking is occurring, a measure of braking is determined for the vehicle. The effective pedal position of the brake pedal is determined to be a position of the brake pedal that would be expected to be required to attain the measure of braking if automatic braking were not occurring.
Abstract:
Systems and methods are provided for controlling a vehicle using a specific torque of a brake system. In one embodiment, a method of using a specific torque of a brake system for a vehicle includes: determining a brake pressure of the brake system during a braking operation; determining a deceleration of the vehicle during the braking operation; determining a vehicle mass and a wheel radius; estimating a specific torque of the brake system based on the brake pressure and the deceleration; and operating the vehicle based on the specific torque.
Abstract:
Systems and methods are provided testing a vehicle braking system. The method includes determining a nominal brake system parameter of the brake system during a braking operation. A first testing brake operation is performed and a first brake system parameter is determined based on the first testing brake operation. A tested brake system parameter is determined based on the first testing system parameter and the tested brake system parameter is compared to the nominal brake system parameter. A brake system compliance suspicion value of the vehicle braking system is then set based on the comparison.
Abstract:
Systems and method are provided for controlling a vehicle. In one embodiment, a method includes: receiving, by a processor, at least one of state health and performance information associated with at least one vehicle actuator; processing, by the processor, the state of health and performance information to determine an acceleration value; and controlling the vehicle based on the acceleration value.
Abstract:
A method of operating a vehicle having a friction braking system and a regenerative braking system is presented here. The method determines a regenerative torque capacity, calculates a desired regenerative torque amount for the braking system, detects that the desired regenerative torque amount exceeds the regenerative torque capacity by at least a threshold amount, and controls actuation of the friction braking system in response to the detecting. Another operating method determines a coastdown torque capability of the vehicle, calculates a desired coastdown torque amount, detects that the desired coastdown torque amount exceeds the coastdown torque capability by at least a threshold amount, and controls actuation of the friction braking system in response to the detecting.
Abstract:
A method for testing to determine a coefficient of friction between a vehicle wheel and a surface with which the vehicle wheel is in contact (“surface mu”) includes the steps of calculating a surface mu confidence level based upon an evaluation of a locale of interest, an evaluation of visual cues sensed by the vehicle at the locale of interest, and/or an evaluation of vehicle signals at the locale of interest and scheduling the vehicle to perform active dynamic testing at the locale of interest. The method further includes the steps of performing the active dynamic testing, wherein the testing comprises commanding the vehicle to perform one or more of propulsion torqueing, regenerative torqueing, or brake torqueing of at least one wheel of the vehicle, receiving a measured parameter from the at least one wheel during said testing, and calculating a surface mu value for the locale of interest.
Abstract:
Methods, systems, and vehicles are provided for controlling lift for vehicles. In accordance with one embodiment, a vehicle includes a body, one or more sensors, and a processor. The one or more sensors are configured to measure values pertaining to one or more parameter values for a vehicle during operation of the vehicle. The processor is coupled to the one or more sensors, and is configured to at least facilitate determining whether an unplanned lift of the body of the vehicle is likely using the parameters, and implementing one or more control measures when it is determined that the unplanned lift of the body of the vehicle is likely.
Abstract:
Methods and systems for controlling torque for a front axle and a rear axle of a vehicle with independent front and rear propulsion systems are provided. A data unit is configured to obtain data for one or more parameters of a vehicle while the vehicle is being driven. A processor is coupled to the data unit, and is configured to provide torque to at least facilitate providing torque the front axle and the rear axle independently based on the one or more parameters.
Abstract:
A system according to the principles of the present disclosure includes a cruise control module, an engine control module, and a brake control module. The cruise control module determines a cruise torque request based on at least one of a following distance of a vehicle and a rate at which the vehicle is approaching an object. The engine control module determines a negative torque capacity of a powertrain. The powertrain includes an engine and an electric motor. The brake control module applies a friction brake when the cruise torque request is less than the negative torque capacity of the powertrain.