‘All’ Archives
Standardized braking test – Vehicle and Brake System Data
Vehicle Data Wheelbase 2754 mm Effective radius of tires 307 mm Centre of Gravity Height 565 mm Maximum speed 214 kph or 133 mph Maximum Gross Vehicle Weight 18394 N or Weight 1875 Kg Front axle Kerb Weight 820 N Rear axle Kerb Weight 565 N Brake Sytem Data Front disc brake [Read More]
Standardized braking test – Discussion and Conclusions
Difficulties During Testing Because there were different braking areas along the track, the conditions for each braking test were slightly different. Therefore, the adhesion coefficient and consequently the rate of braking changed over each braking event. If more time had [Read More]
Standardized braking test – Brake Distribution
The following figure shows the Brake Distribution during the Test 1 and 2 at MIRA in the range 1.5 to 8MPa of Brake Line Pressure. The calculated Brake Distribution calculated is also shown in order to compare the results. It can be seen that both Brake Distributions behave [Read More]
Standardized braking test – Tests
A vehicle which ABS and EBS could be disconnected and selective front/rear/all axles braking was used. The vehicle has a front axle weight of 9352.9N and the rear axle weight of 7506.5N Four braking points were selected in the MIRA test track to perform the braking [Read More]
BMW Plug-in Hybrid Technology
The best of both Worlds: BMW presents the new plug-in-hybrid-technology, built into the BMW Concept Active Tourer. For the first time, BMW combined two different drive concepts in one car: A BMW TwinPower Turbo combustion engine and an electric engine. The concept vehicle [Read More]
Boost ratio
A static test was conducted with and without the booster function to determine the increase of brake line pressure with the assistance of a booster. Normal Booster function Test is conducted with the engine idling and at normal running temperature. Driver’s seat was [Read More]
Functionality of the EBD (Electronic Brake-Force Distribution)
Rearranging this equation is possible to find Master Cylinder Pressure (P(m)) : The modified Braking distribution ratio is: The following plot shows the Braking Distribution Ratio against the Master Cylinder Pressure. The EBD effect is shown by the double red line. The EDB [Read More]
BMW M5 “Bullet”
The world’s fastest sedan recreates super slow-motion bullet footage on a much grander scale. The result: High Performance Art [Read More]
Braking distribution ratio
The braking ratio is defined as: And can be calculated using equation: Where Tf is the braking force front and Tr is the braking force rear. More information on calculating these can be found here. [Read More]
Relationship between the adhesion utilisation and the rate of braking
The adhesion utilizations, f, can be calculated using the equations: The loads applied (static load +/- transfer load) on the front (N1) and rear (N2) axles can be calculated using the following equations: Where: P = Weight of car Z = Rate of braking h = Height of CG. [Read More]