A controller 110 (e.g. brake proportion controller) determines brake torque proportions for a vehicle having braking via: foundation (friction) brakes 212, 222, 232, 242; and electric machines 214, 224, 234, 244 (e.g. regenerative braking). The controller receives a braking request signal (145) and a signal indicating a torque capacity limit for electric machine braking and/or foundation braking. A processor (120) determines a first proportion of electric machine braking to foundation braking to fulfil the braking request in dependence on the torque capacity limit. A braking proportion signal (155), indicative of the determined first proportion, is output to cause a braking system of the vehicle to fulfil the braking request according to the determined first proportion of electric machine braking to foundation braking. In another embodiment, the controller further receives a signal, indicative of activation of an anti-lock braking system (ABS) and/or a signal indicative of a stability system of the vehicle. The processor determines first and second proportions of electric machine braking to foundation braking to fulfil the braking request in dependence on the torque capacity limit, wherein: the first proportion is determined in the absence of activation of the ABS and/or stability systems; and the second proportion is determined in the presence of activation of the ABS and/or stability systems.
Apparatus and method for determining brake torque
2021-09-15
Patent
Electronic Resource
English