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Engine Braking

Introduction

Engine braking, or off-throttle regen, converts the vehicle’s kinetic energy into electrical energy to recharge the batteries via braking torque when you are not commanding motoring torque in torque mode, or when commanding a lower speed in speed mode.

This page will cover the setup and tuning of engine braking.

Configuration

  1. Enable Features bit 13 Engine braking enable.

  2. Set Regeneration battery current limit percentage of your battery’s peak charging/regen current relative to your Rated motor power divided by Rated system voltage.

    Example

    Your Rated motor power is 2880 W, regen is 45 A peak and your Rated system voltage is 48 V. Your regeneration battery current limit is = 45 A/(2880 W/48 V) = 0.75 or 75%.

  3. Set the Maximum braking torque to the desired percent of the Rated motor current. Start out conservatively, e.g., 10%, to understand the braking effect and not risk having too much braking torque and skidding, causing a possible crash.

  4. Set the Engine braking torque to the desired percent of Maximum braking torque.

Note

As of firmware version 6.014, when you have both engine braking and analog regen braking enabled, the controller gives priority to whichever source is commanding the higher braking torque.