A Braking Force Distribution Strategy in Integrated Braking System Based on Wear Control and Hitch Force Control

Paper #:
  • 2018-01-0827

  • 2018-04-03
With the increasing of driving speed and loading capacity of commercial vehicles, braking loads are also gradually increasing,which easily leads to overheating and wear difference of braking pads,affecting stability of braking efficiency and reducing braking force.The auxiliary braking systems could enhance vehicles’ braking stability,and reduce pads wear and braking distance,which finally improve the braking safety and economical efficiency. A braking force distribution strategy in integrated braking system composed of the main braking system and the auxiliary braking system based on wear control and hitch force control used under non-emergency braking conditions is proposed based on the Electronic Controlled Braking System(EBS) to reduce the difference in braking pad wear between front axle and rear axle,as well as to decrease the hitch force between tractor and trailer.The proposed strategy,within the limits of certain braking regulations,identifies the range of actual braking intensity,then sort the priority of safety,economical efficiency and comfort in terms of the actual braking intensity.Then based on the priority,the sequence of operation of different braking types and the braking force distribution coefficient can be determined with the precondition that the objective braking force can be realized.By comparing the braking energy of different axles absorbed in braking calculated by the thermodynamic models, three wear conditions- equal brake pad wear, greater wear on the front axle and greater wear on the rear axle can be used to distribute the braking force considering the aim to reduce and balance pad wear for economical efficiency and decrease the hitch force for comfort.Computer co-simulations with TruckSim and MATLAB/Simulink was performed.The computation simulation results and the hardware-in-loop simulation experiment results show that the proposed strategy can effectively reduce and balance the pad wear and decrease the hitch force.
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