Forklift Speed Three-Level Alarm and Speed Limiting System Description

I. Alarm Speed Levels and Response Mechanism

1. Level 1 Alarm: Default at 8 km/h. When the vehicle speed exceeds this limit, the audible-visual alarm flashes as a warning.

2. Level 2 Alarm: Default at 10 km/h. When the vehicle speed exceeds this limit, the audible-visual alarm flashes and emits a “beep” sound.

3. Level 3 Alarm: Default at 12 km/h. When the vehicle speed exceeds this limit, the audible-visual alarm flashes with a voice prompt: “Overspeed, please pay attention.” At the same time, the host unit outputs a throttle control signal. Working with either an electronic or mechanical throttle controller, the system limits the vehicle speed to remain within this preset range.

II. Speed Limiting Mode

When the vehicle speed exceeds the preset “Level 3 alarm speed,” the system immediately issues a voice prompt: “Overspeed, please pay attention!” and outputs a throttle control signal. With the support of the electronic or mechanical throttle controller, the system restricts the vehicle speed within the preset “Level 3 alarm speed,” preventing further acceleration.

III. Lock Mode

If the vehicle speed continuously exceeds the preset “Level 3 alarm speed” for 5 seconds, the system enters lock mode:

• The system continuously outputs alarm signals and throttle control signals;

• The host issues repeated voice prompts: “Overspeed, please pay attention.”

• The vehicle is locked in idle state and cannot accelerate normally;

• Only an administrator can release the lock by pressing the unlock button on the remote controller.

IV. Summary

The forklift speed limiter adopts a three-level alarm mechanism that integrates visual/audible alerts, voice prompts, and throttle control to provide step-by-step responses to overspeed behavior. The speed limiting mode ensures real-time speed control, while the lock mode enforces strict intervention for prolonged overspeeding, guaranteeing driving safety. Administrators can manage vehicle status flexibly via the remote controller, enhancing both controllability and safety. Users may adjust the default threshold values of each alarm level according to their actual needs.