Brake Technology


Anti-Lock Braking System (ABS)

A system that prevents the wheels from locking while braking hard, or on slippery surfaces, to retain steering control. This allows the driver to steer away from a potential accident which may otherwise occur with locked wheels and the vehicle out of control.



Why

When the brake pedal is depressed, the wheels can lock before the vehicle comes to a stop (skid). In such an event, the manoeuvrability of the vehicle is reduced or totally lost if the front wheels are locked (The vehicle will travel in the direction its mass weight takes it irrespective of the position of the steering wheel). Likewise the directional stability of the vehicle is compromised if the rear wheels are locked (The unrestrained mass weight of the rear of the vehicle will try to cause rotational movement, i.e.- a spin).

Where

Honda ABS is a fully integrated part of the braking system and can not be added on. It is situated between the brake master cylinder and wheel brakes and is passive under normal braking.

How
Each wheel hub has multi segment rotor, or disc, which turns at the same speed as the road wheel. Each rotor has a stationary pickup sensor which converts wheel speed into electrical impulses. The impulses from each wheel are fed into a central computer. The central computer compares the wheel speeds against each other, and the de-acceleration rate.

The main braking system is equipped with a "Modulator." The modulator can control the amount of braking force applied to each wheel brake when called upon by the ABS central computer. Under normal braking the ABS has no influence on the brakes, and in no circumstances can it operate below 10kmh.

Under braking, where one or more wheel slows down faster than the others, about to lock, this is detected by the central computer. The computer tells the modulator to adjust the braking force to that wheel, so that it will not lock. This communication between wheel - central computer - modulator occurs many times a second. On each occasion an adjustment can occur until the "offending" wheel assumes the same braking speed as the other wheels, ensuring optimal braking performance. As these adjustments are carried out "kickback" or "pulsing" will be felt at the brake pedal.

 

 

Electronic Brake Distributiont (EBD)

Electronic Brake Distribution utilises part of a vehicle's ABS system to adjust the braking force between the front/rear and left/right wheels dependent on tyre grip. EBD offers greater braking stability under all braking conditions and does not require ABS to be activated to operate.



How

EBD uses the anti-lock components including wheel rotors and pick up sensors, central computer, and the modulator.

Why
Under all forward braking conditions, vehicle weight is transferred towards the front. This weight transfer reduces the load on the rear wheels, which in turn increases the likelihood of rear wheel lockup. Under these conditions EBD (via the ABS modulator) controls the amount of braking force applied to each rear brake to optimise braking efficiency.

 

 

Emergency Brake Assist (EBA)

Honda’s Emergency Brake Assist helps the driver apply full braking pressure in an accident avoidance situation. To do so, a microprocessor analyses and “learns” the driver’s normal braking habits - monitoring both the rate of pressure applied and the total pressure that the driver normally applies to the brake system.

 

How
If sudden braking occurs, Emergency Brake Assist activates the VSA pump and brings the brake system pressure high enough to cause the vehicle to make a full stop in the shortest distance possible. The braking assist is only activated when the microprocessor detects that certain brake pedal speed or pressure thresholds are reached.

Why
Emergency Brake Assist assists the driver in obtaining full braking performance in an emergency. The Emergency Brake Assist system deactivates when the driver releases pressure on the brake pedal.