Common use of Functions Description Clause in Contracts

Functions Description. In the case system, we assume that braking is controlled by the vehicle driver. • When a brake pedal displacement is detected, the brake torque calculator computes the driver requested torque and sends the value to the vehicle brake controller function. • The vehicle brake controller then decides the required torque on each wheel. Each of the required wheel torque values is sent together with the sensed vehicle velocity to the ABS function on respective wheel. • Based on the received torque request, current vehicle velocity and wheel angular velocity, an ABS function decides appropriate braking force on wheel. Compared to conventional braking where the needed braking force is completely realized by the electromagnetic brake actuator (which is connected to the brake disc), the regenerative braking allows a fraction or whole of the needed braking force to be realized by electrical motor. To this end, the local power electronic control function of each wheel receives the observed battery and capacitor status for determining the maximum possible braking torque to be offered by the electrical motor. It informs the ABS function about current brake torque by electrical motor based on the measured motor load current. With such information, the ABS function commands the local power electronic control function (which is connected to the power converter for transferring energy from an electrical motor to a capacitor) and the electromagnetic brake actuator (which is connected to the brake disc) for realizing the requested braking force. The converted braking power is first stored in capacitors. Depending on the status of battery and capacitor, the power stored in the capacitors can be used either to recharge the battery or to directly drive the motors for acceleration or deceleration.