Course
Regenerative Braking Engineering Lab
An engineering-level course on regenerative braking — kinetic energy recovery, the motor as a generator, brake blending and brake-by-wire, one-pedal driving calibration, and the real-world efficiency, wear and performance trade-offs of recovering energy instead of burning it as heat. Built around a regen simulator, an interactive braking system explorer, calculators, a virtual tuning lab and fault-diagnosis scenarios.
By the end, you'll be able to
- Explain why kinetic energy recovery beats friction braking and quantify the loss chain
- Describe how a traction motor operates as a generator during braking
- Read a blended-braking system map and explain how the VCU arbitrates regen and friction torque
- Explain how ABS/ESP can veto or trim regen torque for wheel-slip safety
- Calibrate a one-pedal driving torque map and its safety implications
- Evaluate regen's real-world impact on range, brake wear and performance, and diagnose blended-braking faults
Module 1
Energy recovery fundamentals
Kinetic energy, the motor as a generator, loss chains, and SOC/temperature limits.
5 lessons
- 1Kinetic energy: what braking actually destroysEvery stop throws away energy proportional to the square of speed — regen is the attempt to catch some of it.10 min
- 2The motor as a generatorThe same machine that accelerates the car can decelerate it, simply by reversing the sign of its torque.11 min
- 3Why you never get 100% backEvery stage of the recovery chain loses a slice of energy to resistance, switching and friction.10 min
- 4State of charge and temperature limits on regenThe battery management system, not the motor, usually decides how much regen power is allowed.11 min
- 5Lab: tuning regeneration for maximum recoveryPut the theory to work — balance lift-off torque against axle grip and battery limits.12 min
Module 2
Brake blending & brake-by-wire
Brake-by-wire architecture, pedal feel, blending logic and ABS/ESP arbitration.
5 lessons
- 1Brake-by-wire: decoupling the pedal from the calipersModern EVs replace the direct hydraulic link between pedal and brakes with an electronic request the VCU arbitrates.11 min
- 2Manufacturing a pedal feel that isn't really thereWith no direct hydraulic link, engineers must artificially recreate the resistance a driver expects to feel.10 min
- 3How the blend is actually computedThe VCU converts one deceleration request into two torque targets, updated many times a second.12 min
- 4ABS, ESP and the right to veto regen torqueWheel-slip control always outranks energy recovery — the stability system can trim or kill regen instantly.11 min
- 5Lab: diagnosing blended-braking complaintsWork through real symptom reports and trace them back to a root cause in the blending chain.12 min
Module 3
One-pedal driving
Lift-off torque calibration, creep/hold behaviour, and driver-safety implications.
5 lessons
- 1One-pedal driving: lift-off deceleration as a featureStrong lift-off regen lets most driving be done, and most stops be completed, without touching the brake pedal.10 min
- 2Creep, hold, and the last few km/hRegen torque fades out near a stop, and something else has to hold the car once it's stationary.10 min
- 3Tuning the lift-off torque mapCalibration engineers shape a curve of regen torque against pedal position and speed — not a single number.11 min
- 4Driver adaptation, brake lights, and following-vehicle safetyStrong lift-off deceleration raises a real question: does the car behind you know you're slowing down?10 min
- 5Lab: calibrating a one-pedal driving modeBalance recovery, comfort and safety while shaping the lift-off torque curve for a target vehicle.12 min
Module 4
Efficiency, wear and the road ahead
Real-world range impact, brake wear economics, performance-envelope regen and future development.
5 lessons
- 1How much range does regen actually add?The honest answer depends enormously on driving style, terrain and where the trip happens.11 min
- 2The other payoff: brake pad and rotor lifeHeavy regen use means friction brakes in an EV can last many times longer than in a combustion car.9 min
- 3Regen at the performance envelopeHigh-performance EVs push regen power far beyond everyday commuting, with different engineering trade-offs.10 min
- 4Where regenerative braking is headedPredictive control, four-wheel regen and smarter battery interfaces are closing the remaining gaps.10 min
- 5Capstone lab: engineering the full braking system trade-offBring together regen recovery, vehicle performance and efficiency into one integrated calibration exercise.13 min