What matters most for a golf cart? Safety.
As the brain of the vehicle, every line of code and every logic decision in the controller should revolve around safety. My solution combines speed mode, smart self-diagnostics, downhill speed limiting, uphill anti-rollback, and electromagnetic brake interlock.
First thing upon power-up: self-check.
The controller does not rush to drive. It runs a full check first.
Is the accelerator pedal at zero position? Is the gear selector signal valid? Are there any loose connections or broken wires? Is the motor phase connection intact? Is the brake circuit closed? Is CAN communication online?
If any abnormality is detected, the controller immediately enters protection mode, refuses to drive, and outputs a fault code.
The first rule of safety: no confirmation of safety, no power output.
Downhill: no freewheeling, controlled speed.
Coasting downhill? Not acceptable.
When the controller detects a downhill slope, it actively applies motor regenerative braking to limit the speed within the set range. This is the speed limiting function. The moment the speed drops to zero, the electromagnetic brake engages automatically.
The safety principle: speed must be controlled, and stopping must be locked.
Uphill: lock at the instant of standstill, do not wait for rollback.
Going uphill, the driver releases the accelerator. The speed gradually drops to zero. If nothing intervenes, gravity will cause the cart to roll backward.
My controller triggers the electromagnetic brake at the exact instant the speed reaches zero. It does not wait for the cart to start rolling back; it locks right at that moment of stillness.
Why not wait until rollback occurs? Once the cart begins rolling backward, the driver is likely to stomp the accelerator. The controller then has to handle forward gear, backward motion, and a high current command simultaneously. Any slight deviation can lead to loss of control. Prevention is always better than cure.
Why must it be an electromagnetic brake?
Electronic braking can fail when power is lost, and on steep slopes the motor may not have enough current to hold the cart.
The electromagnetic brake is a pure mechanical lock. It holds even when power is cut off, and it works regardless of the slope angle. Electronic control handles smooth deceleration, while mechanical locking guarantees absolute stillness. The two work together and neither is dispensable.
In one sentence:
Check yourself first on power-up. Stay stable on flat ground. Slow down controllably on downhills. Lock firmly on uphills.
A golf cart controller does just one thing: write safety into every line of code, so that the cart always responds to the driver as intended, in any situation.
