A vehicle braking control method includes activating an electronic parking brake system on a vehicle to perform a braking operation; checking whether a rear wheel unlock braking activation condition is met during the braking operation, and if it is met, acquiring a current vehicle stability characteristic. The method further includes determining whether the acquired vehicle stability characteristic is within a preset range; if it is, using motive power supplied by an electric machine on the vehicle together with a rear wheel unlock braking system to execute the braking operation, otherwise executing the braking operation with the rear wheel unlock braking system.

Methods and systems for operating a vehicle on a reduced traction surface are disclosed. A controller of the vehicle obtains at least one of: ambient information or GPS information, determines a derate increment size based on the ambient or GPS information, imposes a sustained derate by applying a torque limit on a braking torque of the vehicle based on the derate increment size in response to detecting a traction control event. The controller also determines a verification period and a derate reduction period based on the ambient or GPS information to reduce the sustained derate in response to detecting a lack of traction control event during the verification period at a rate determined by the derate reduction period.

Described are devices, systems and methods for managing a supplemental brake control system in autonomous vehicles. In some aspects, a supplemental brake management system includes brake control hardware and software that operates with a sensing mechanism for determining the brake operational status and a control mechanism for activating the supplemental brake control in an autonomous vehicle, which can be implemented in addition to the vehicle's primary brake control system.

Methods and systems for operating a vehicle on a reduced traction surface are disclosed. A controller of the vehicle obtains at least one of: ambient information or GPS information, determines a derate increment size based on the ambient or GPS information, imposes a sustained derate by applying a torque limit on a braking torque of the vehicle based on the derate increment size in response to detecting a traction control event. The controller also determines a verification period and a derate reduction period based on the ambient or GPS information to reduce the sustained derate in response to detecting a lack of traction control event during the verification period at a rate determined by the derate reduction period.

A method for automatically braking a commercial vehicle includes: providing a plurality of ultrasonic radars on a front vehicle body of a target commercial vehicle, the ultrasonic radars being configured to detect a region before the target commercial vehicle in a gapless manner, an active speed range being set for each ultrasonic radar; acquiring a current speed of the target commercial vehicle in real time and calculating a safe distance for each ultrasonic radar in accordance with the current speed; and detecting whether there is an obstacle within the safe distance in real time, and when there is the obstacle within the safe distance, transmitting a decelerating or braking instruction to an execution system of the target commercial vehicle.

Techniques and systems are described that enable automatic emergency braking (AEB) using a time-to-collision (TTC) threshold that is based on target acceleration. The TTC may be a combination of a first TTC sub-threshold and a second TTC sub-threshold. The first TTC threshold may be based on a vehicle velocity of a host vehicle and a relative velocity between the host vehicle and a target object. The second TTC sub-threshold may be based on a target acceleration of the target object and a distance between the host vehicle and the target object. By utilizing the target acceleration in the TTC threshold determination, the techniques and systems described herein enable AEB to work as planned to prevent a collision between a vehicle and a target, in a wider variety of environments and situations.

A system for measuring motion of a locomotive vehicle includes a speed sensor, a decelerometer and an onboard processing unit. The speed sensor is configured to measure wheel speed of the locomotive vehicle. The decelerometer includes a level-sensitive device configured to measure acceleration or deceleration of the locomotive vehicle as a function of a tilt from a level position. The onboard processing unit computes a current grade traversed by the locomotive vehicle prior to detection of a slip or slide condition based on a first measurement signal from the decelerometer. Upon detection of the slip or slide condition, the onboard processing unit obtains a second measurement signal from the decelerometer and filters out the current grade from the second measurement signal. The onboard processing unit determines an actual acceleration or deceleration of the locomotive vehicle during the slip or slide condition from the filtered second measurement signal from the decelerometer.

An eddy current brake for a vehicle, the eddy current brake comprising a rotor, and an electromagnet arranged to receive current from an electromechanical energy generating means during braking of the vehicle and to induce an eddy current within the rotor.

A control unit (130, 140, 300) for controlling a heavy duty vehicle (100), wherein the control unit is arranged to obtain an acceleration profile (a.sub.req) and a curvature profile (c.sub.req) indicative of a desired maneuver by the vehicle (100), the control unit (130, 140, 300) comprising a force generation module (310) configured to determine a set of global vehicle forces and moments required to execute the desired maneuver, the control unit (130, 140, 300) further comprising a motion support device, MSD, coordination module (320) arranged to coordinate one or more MSDs to collectively provide the global vehicle forces and moments by generating one or more respective wheel forces, and an inverse tyre model (330) configured to map the one or more wheel forces into equivalent wheel slips (λ), wherein the control unit (130, 140, 300) is arranged to request the wheel slips (λ) from the MSDs.

A system that includes a first control unit having one or more processors. The one or more processors may operate a first traction control unit and a first braking device of a first vehicle of a vehicle system based on an operator input command signal. The system also includes a second control unit in communication with the first control unit and having one or more processors configured to operate a second traction device and a second braking device of a second vehicle of the vehicle system based on at least one operational objective of the vehicle system.