User:Intentdes/sandbox

Rapid Braking System
Current 2 wheeler braking architecture

In a two wheeler, hand lever controls the front wheel braking and foot pedal controls the rear wheel braking. The front can be either drum brakes or hydraulic disk brakes and so is the case with rear wheel brake as well. Problem at hand

During braking, operator has to decide the amount of brake distribution between the front wheel and the rear wheel by adjusting the foot pedal v/s hand lever. Here are a few cases: •If there is no passenger, let us assume the weight distribution is 50-50 then the operator must apply equal braking force on both wheels. Depending upon gradient and the road traction, this percentage will change. If the driver is on a good pavement with high friction coefficient, the bike rear wheel tends to lift off the ground (not literally, as the bike center of gravity is above the tire-road contact line it causes a forward moment). This changes the weight distribution ratio and is a function of “mu” as well as bike geometry (wheel base, CG etc.). An experience driver increases the force on the front wheel and reduces on the rear thereby continuing to use the weight of the bike but ensure rear wheel does not lock. During this phase, if the vehicle enters a low friction patch such as ice, water, sand, front wheel would tend to lock suddenly as the vehicle ratio rapidly shifts back to normal (due to lack of forward deceleration that was causing the moment transfer to begin with). There is a big risk of front wheel lock during such incidents. •If there was a passenger on the bike, the weight on the rear wheel would increase, thereby needing higher force on the rear v/s front. All other things are still applicable as related to weight transfer during dynamic situations. •During panic braking, an operator has to decide all the above parameters within a very short period and has to have the experience.

Existing solution

Antilock brakes solve this exact problem by not allowing the wheels to lock. Unfortunately, it requires a lot of electronics and mechanical paraphernalia such as speed sensors, pulse width modulators, hydraulic braking etc. This technology while is quite common is not available for mechanical drum brake driven vehicles which currently make up 99% of the market in Indian two wheeler segment. Less than 0.1% of the two wheelers have dual hydraulic brakes with Anti-lock braking systems on the road today.

Here comes RBS

Depending upon the road condition, weight distribution of the bike, RBS changes the braking ratio between the front and the rear REAL TIME. Imagine if you were applying the Brake on good pavement, due to high traction, RBS would shift most of the braking to the front wheel while retaining the desired amount on the rear wheel. Should you suddenly encounter a sand patch or wet pavement, RBS would shift the ratio accordingly to reduce braking on the front wheel (to compensate for reduced traction on front wheel). If you had a Pillion rider, RBS would increase the braking to the rear wheel as compared to the case without a Pillion rider.

http://www.intent-rbs.com/