December 10, 2018

Braking Trends

BY :     December 10, 2018

Kinetic energy is defined as the energy possessed by an object due to its motion. Kinetic Energy is 0.5 times the mass and the square of velocity. The amount of kinetic energy (KE) possessed by a moving object is dependent upon mass and speed. Thus when we are stopping a vehicle we need to generate the appropriate forces to the brakes of the vehicle so that it stops at the desired distance and also we should ensure it does not destabilize in the process. The Brake by wire technology is a technology to control brakes through electronic means in order to smoothly stop a vehicle in all road and weather conditions it is usually an extension to EPB which is more common on all latest vehicles.

When we are trying to model such systems we need to consider all of the complexity of a vehicle stability control system and also we need an array of sensors to monitor all the inputs for the brake system include the wheel speed sensors, traction battery state of charge, yaw sensor, brake pedal, stroke sensor, steering wheel angle, hydraulic actuator pressure, hydraulic pressures of each wheel caliper circuit, and accelerator position. Along with that we also need to monitor all the missing information through a predictive filter.

Brake by wire-based technology reduces the number of moving parts. A brake-by-wire system directs the brakes primarily through an electrical wire, controllers and a software system. Hence it reduces the mechanical carb weight hence reducing the cost and provide economy to the fuel. Also, it provided assistance to drivers in adverse scenarios.

But because of the complexity of drive-by-wire systems, engineers worry about potential electronic malfunctions in sensors and computers, or software components leading to vehicle damage or even car accidents and passenger injury due to failure to brake properly.

Hence we need to have additional algorithms to supervise the transition between electronic and mechanical system or a partial mechanical system. The boundary condition of such a system needs to be analyzed using the additional algorithm.

Now the debate will be how much cost-effective or complex will be such an algorithm. Whether it will be reliable, should we trust such algorithms or depend on the age-old mechanical braking systems at least it will stop our cars and again should not break the old trend and accept these new technologies.

Kushanava Kundu

About

Model Based Developer expertise in Automotive Domain in the area of Active Safety. Having extensive experience in automotive functional architecture for Global OEMs using model based architecture. Hands on experience in tools like Matlab, Simulink, Rhapsody, State flow for multiple automotive projects.

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*Opinions expressed on this blog reflect the writer’s views and not the position of the Sogeti Group