What are the special requirements for the braking system of electric wheelchairs?

What are the special requirements for the braking system of electric wheelchairs?
The braking system of an electric wheelchair is a key component to ensure the safety of the user. Its design and performance must meet strict special requirements to adapt to different usage scenarios and ensure the safety of the user. The following are the main special requirements for the braking system of an electric wheelchair:

1. Braking performance requirements
Braking distance on horizontal roads
When an electric wheelchair is traveling at maximum speed on a horizontal road, the braking distance should meet the following standards:
Indoor electric wheelchair: braking distance not exceeding 1.0 meters.
Outdoor electric wheelchair: braking distance not exceeding 1.5 meters.
Road electric wheelchair: braking distance not exceeding 3.5 meters.
Maximum safe slope braking
On slopes of different slopes, the braking performance of electric wheelchairs must also meet specific requirements:
Indoor type: maximum safe slope of 3°, braking distance not exceeding 1.6 meters.
Outdoor type: maximum safe slope of 6°, braking distance not exceeding 3.6 meters.
Road type: maximum safe slope of 8°, braking distance not exceeding 6 meters.

2. Parking brake requirements
Slope performance
When the electric wheelchair is parked on a slope, it must have a reliable parking brake function to ensure that the wheelchair does not slide. According to GB/T 18029.3-2008 standard, the parking brake should not have brake displacement or brake performance changes after testing.
Fatigue strength of parking brake
The parking brake needs to undergo multiple fatigue tests to ensure that it maintains stable braking performance during long-term use.

3. Emergency brake function
Power-off brake
The electric wheelchair should be equipped with a power-off brake function, that is, when the battery is exhausted or the power is interrupted, the brake can be automatically activated to ensure that the wheelchair stops safely. This type of brake usually uses spring force to brake to ensure that it can respond quickly in an emergency.
Emergency stop function
The brake system must have an emergency stop function to ensure that the user can stop the wheelchair immediately under any circumstances through simple operations (such as pressing the emergency stop button).

4. Reliability and durability of the brake system
Durability of components
The components of the brake system (such as brake levers, brake pads, etc.) must be able to withstand wear and tear during long-term use and can be easily adjusted or replaced after wear.
Stability of the braking system
The braking system should maintain stable and reliable performance under various conditions of use (such as different road conditions and different loads), and there should be no braking failure or degradation of braking performance.

V. Compliance with international standards and regulatory requirements
International standards
The braking system of electric wheelchairs must comply with relevant standards of the International Organization for Standardization (ISO), such as the ISO 7176 series of standards. These standards specify the test methods and performance requirements of the braking system to ensure that the wheelchair can meet basic safety standards in different countries and regions.
Regulatory requirements
In different countries and regions, the braking system of electric wheelchairs must also comply with local regulatory requirements. For example, in the European Union, electric wheelchairs must pass CE certification, and their braking systems must meet the EN 12184 standard, including tests on braking performance, stability and durability.

VI. User convenience
Brake lever design
The design of the brake lever must be ergonomic and easy for users to operate. For example, the force point of the brake lever must be reasonably designed to ensure that users can easily operate it in different postures.
Operational flexibility
The braking system should have good operational flexibility to ensure that users can quickly and accurately perform braking operations in emergency situations.

Summary
The brake system of an electric wheelchair is a key component to ensure the safety of the user, and its design and performance must meet strict special requirements. These requirements include not only technical indicators such as braking performance, parking brake, and emergency brake functions, but also the durability of components, the stability of the system, and compliance with international standards and regulations. By meeting these special requirements, electric wheelchairs can provide users with a safer, more reliable and convenient experience.