Here we have focused on combining regenerative and friction braking technology to ensure maximum energy recovery whilst ensuring safety (vehicle stability and traction).
A comprehensive state of the art technology analysis which included a hybrid/electric vehicle benchmarking programme
- Analysis of current braking legislation requirements and the implications upon design for hybrid/electric vehicles
- A suite of hydraulic braking models able to simulate a range of modulator and braking system architectures and indicate how to control the creation of hydraulic pressure via an electronic demand
- A vehicle handling simulation toolset which models the vehicle and regenerative braking dynamics for various hybrid/electric vehicle and brake system architectures
- Research into brake blending and vehicle stability control algorithms utilising the CAE toolsets that were developed in the project
A working prototype rheostatic braking system that is able to dissipate large amounts of braking power independent of the foundation braking and high voltage battery systems
Business Impact – New Products and Processes
Tata Motors European Technical Centre (TMETC) utilised this tool to evaluate brake energy capture potential over standard drive cycles.
MIRA can now offer consultancy related to legislative requirements for regenerative braking systems, and with TMETC, have attained knowledge of state of the art bespoke benchmarking procedures.
Coventry University has developed a sophisticated brake torque apportionment controller, responsible for governing the regenerative and friction torques sources.
Cranfield University has developed a brake vacuum booster testing rig to help validate their detailed modelling and simulation activities of the friction brake system.
WMG has developed a reduced 1st order hydraulic brakes model library. This framework has been used extensively in the model-based development of complex regenerative brake control systems and their evaluation in terms of overall energy recovery and impact on vehicle dynamics.
All models are real-time capable and have been successfully implemented on an IPG Automotive XPack4 Hardware-in-Loop (HiL) platform, to perform real-time validation and verification of control systems, and to study the impact of signal propagation delays over Controller Area Network (CAN) and FlexRay communication networks.
Ricardo has investigated the application of the IPG carmaker ABS algorithm with respect to its application as a basis for investigating the interaction between regenerative braking and stability control systems.