Accelerator & Brake Fusion

Disambiguation

The term 'throttle' originates from gas/combustion engines, where it refers to a control element for acceleration. As we transition to electric vehicles, we prefer the term 'accelerator'. Both terms can be used interchangeably as synonyms.

Configure accelerator and brake signal behavior using drvopts parameter.

Prerequisites

Requires configured accelerator and brake signals with ASC and CSC blocks.

Value	Bit	Function
4	2	Enable accelerator-brake signal combination
8	3	Disable reverse in accelerator-brake fusion
-	-	Other bits documented separately

drvopts uses bitwise configuration. This document covers bits 2 and 3 only.

Standard Operation

Default setting (bits 0): Accelerator signal passes directly to driver. Brake signal, when active, triggers motor braking regardless of accelerator position.

Dynamic Brake Reverse

Subtracts brake signal (post-CSC) from accelerator signal (post-CSC). Negative result enables reverse rotation. Enables instant direction changes - useful for dual-pedal systems like forklifts. Equal pedal pressure cancels signals, stopping motor.

Enable: Set drvopts to 4

Accelerator-Brake Integration

Similar signal path to Dynamic Brake Reverse. Negative results trigger proportional braking instead of reverse. Functions like clutch system but applies braking force below zero.

Enable: Set drvopts to 12 (4+8)

info

Differs from clutch input:

• Clutch: Full clutch = freewheeling, regardless of accelerator
• Fusion: Full brake = maximum braking force

Accelerator-Based Reverse

Enables single-pedal forward/reverse control. Splits accelerator range into forward and reverse zones.

Configuration:

1. Set center in accelerator linked ASC to define neutral point
2. Above center = forward, below = reverse
3. Use CSC ldz for neutral zone width

Incompatible with:

• Accelerator-brake fusion
• Dynamic brake reverse
• Accelerator brake (comlvl)