Oct 10, 2014 regenerative braking is the recovery of kinetic energy during braking. It is regenerative because the energy is recaptured in the battery where it can be used again. Regenerative braking is not by itself sufficient as the sole means of safely bringing a vehicle to a standstill, or slowing it as required, so it must be used in conjunction with another braking system such as frictionbased braking. One of the more interesting properties of an electric motor is that, when its run in one direction, it converts electrical energy into mechanical energy that can be used to perform work such as turning the wheels of a car, but when the motor is run in. Regenerative braking is a system in which the electric motor that normally drives a hybrid or pure electric vehicle is essentially operated in reverse electrically during braking or coasting.
On the other hand, there is a strong limitation in 50 hz systems. The most promising system was a purely mechanical flywheel system. The tradeoff of efficiency vs control of the vehicle is certainly worth it. Braking systems electrical regenerative brakes are most commonly seen in electric or hybrid vehicles. Regenerative braking helps reduce wear and tear on the frictional braking system of the car which leads to less need for repairs. Regenerative braking systems rbs future of braking systems 76 fig.
May 24, 2016 regenerative braking project report 1. During huge amount of energy is lost to atmosphere as heat. Question regenerative braking efficiency does anyone know efficiency metrics for regenerative breaking based on manufacturermodel. The electric supply system has a considerable influence on the feasibility of energy recovery. Within the detail study, dimension calculations with regards to some volume and weight constraints for. Functional safety assessment of a generic, conventional. To ensure that the system can provide maintain the braking force while generating electrical energy at the same time, regenerative braking boundaries should be. In a conventional vehicle, a majority of the kinetic energy is converted during friction braking into heat and emitted unused. Amitesh kumar abstract hydraulic regenerative braking system is an important branch of hybrid technology, which has the advantage of high power density and the ability to accept the high rateshigh frequencies of charging and discharging, therefore hydraulic regenerative braking technology is well. Wear reduction an electric drive train also allows for regenerative braking which increases efficiency and reduces wear on the vehicle brakes because it reduces braking noise and brake dust. Now coming to the term or question what is braking.
Nov, 20 regenerative braking is a fairly easy to understand concept, once one understands how motors work, and how generators work. To learn more about braking systems and related automotive topics, check out the links below. Aaacommonaarfilesadastechnologynamesresearchreport. This paper gives an idea about a flywheel based mechanical regenerative braking system r. The regen system is emulated in the sense that the friction brake wheel torque is equal to that produced by an electric machine. In a traditional car, a tremendous amount of energy is wasted by the braking system. For example, if the battery or the system controlling the regenerative braking failed, then mechanical braking becomes critical. Regenerative braking a regenerative brake is an apparatus, a device or system which allows a vehicle to recapture and store part of the kinetic energy that would otherwise be lost to heat when braking. To ensure that the system can provide maintain the braking force while generating electrical energy at the same time, regenerative braking boundaries should be taken into consideration 44.
Regenerative braking the regenerative braking system delivers a number of significant advantages over a car that only has friction brakes. Regenerative braking system is emerging technology to recover. Electrohydraulic brake ehb system capable of emulating a regen braking system. Automatic braking system whole project documentation. Regenerative braking sometimes shortened to regen is used in all of the hybrid and batteryelectric cars currently offered in the u. This is the basic principle of regenerative brakes. A mechanical braking system is also important in the event of an electrical failure.
Functional safety assessment of a generic, conventional, hydraulic braking system with antilock brakes, traction control, and electronic stability control report. It will be continue reading synopsis on regenerative braking system. When brakes are applied in the car, the kinetic energy gets converted into heat energy at the brake pads and dissipates into the surrounding. Adaptive regenerative braking for electric vehicles with. Compact regenerative braking scheme for a pm bldc motor. Synopsis on regenerative braking system mechanical projects. This report has been produced by trl limited, underas part of a contract placed by. Hydraulic regenerative braking system to improve the vehicle fuel economy an alternative regenerative braking system is being developed by the ford motor company and the eaton corporation. In the regenerative braking mode, the motor slows downhill the car.
Conventional braking system, regenerative braking, electric motor, flywheel energy storage i. Introduction to conventional braking system braking in a moving vehicle means the application of the brakes to slow or stop its movement, usually by depressing a pedal. The research report presents a comprehensive assessment of the global regenerative braking systems market and contains thoughtful insights, facts, historical data, and statistically supported and industryvalidated market data. First of all we can classify the term braking in two parts.
In lowspeed, stopandgo traffic where little deceleration is required. Regenerative braking system for vehicles thesis123thesis123. Regenerative braking safety issue tesla motors club. Regenerative braking is a fairly easy to understand concept, once one understands how motors work, and how generators work. The objective of this paper is to determine the most proper regenerative system for an ev modified from used car equipped with cross link circuit braking system and antilock brake system abs. The regenerative braking system is a key technology to improve the vehicle energy utilization efficiency because it transforms the kinetic energy to. Mar 27, 2017 share tweet synopsis on regenerative braking system abstract. It also contains projections usinga suitable set of assumptions and methodologies. Working how regenerative braking systems work regenerative braking is something that is becoming a modern standard for vehicles of all descriptions as what was before just wasted energy used to slow a vehicle down is now being captured for reuse by the vehicle, making it more efficient. Thankfully, a regenerative braking system makes use of this heat to regenerate the batteries of the electric vehicle.
Modifications of vehicle type or braking system and extension of. In a batterypowered electric vehicle, regenerative braking also called regen is the conversion of the vehicles kinetic energy into chemical energy stored in the battery, where it can be used later to drive the vehicle. Synopsis on regenerative braking system mechanical. Indian railways are fitted with rheostatic braking system, and all the 3phase ac traction locomotives and 3phase emus are fitted with regenerative braking system.
Pdf analysis of regenerative braking efficiency a case. Functional requirements for automatic emergency braking systems. The brake controller functions are monitor the speed of the wheel, hence calculate the torque, electricity which is to be generated and rotational force thus to be feed to. Thus, antilock braking system is more advantageous in evs. Project report on regenerative braking system free download as word doc. Regenerative braking project report linkedin slideshare. Amitesh kumar abstract hydraulic regenerative braking system is an important branch of hybrid technology, which has the advantage of high power density and the ability to accept the high rateshigh frequencies of charging and discharging, therefore hydraulic regenerative braking. We know that brake is an equipment to reduce the speed of any moving or rotating equipment, like vehicles, locomotives. The braking distance is the distance between the time the brakes are. Instead of consuming energy to propel a vehicle, the motor acts as a generator that charges the onboard batteries with electrical energy that would normally be lost as heat through traditional. This advancement of technology in braking system controls the speed of the vehicle by converting some amount of the vehicles kinetic energy into another useful form of energy. Appendix 3 vehicle stability function simulation tool test report.
The regenerative braking system, however, slows a vehicle down in a different way. Automatic braking system a project report submitted in partial fulfilment of the requirements for the award of the degree of. Download the seminar report for regenerative breaking. Regenerative braking system for vehicles is the way of slowing vehicle by using the motors as brakes. Adaptive regenerative braking for electric vehicles with an. In this mechanism, the electric traction motor uses the vehicles momentum to recover energy that would otherwise be lost to the brake discs as heat. This simple diagram shows how a regenerative braking system is able to recapture some of the vehicles kinetic energy and convert it into electricity. The braking system and controller is the feeling of the structure because it controls the whole part of vehicles of the motor. It is braking because it also serves to slow the vehicle.
This since it was deemed a more interesting research subject by the stakeholders. Modification of vehicle type or braking system and extension of approval. Regenerative braking system is emerging technology to. Dec 30, 2018 the term braking comes from the term brake. Despite the amount of research and development that has gone into regenerative braking, there is still significant room for improvement.
Instead of consuming energy to propel a vehicle, the motor acts as a generator that charges the onboard batteries with electrical energy that would. Regenerative braking is still very limited and dependent on uncontrollable variables. This electricity is then used to recharge the vehicles batteries. Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. Energy efficient electric vehicle using regenerative. This dissipated energy can be put to some useful work. Mar 20, 2017 the main reason is a technology called regenerative braking. The main use of the test vehicle is to analyze the limitations of additive regen braking. Im making the assumption that regenerative breaking at a slower rate would be more efficient, for example 60mph to 0mph over a mile would store more energy than over a quarter mile.
Regenerative braking systems market global industry. The control of generator braking torque of a regenerative braking system is easier than the control of the mechanical braking force. Most of the latest vehicles from manufacturers, such as. It converts the motion kinetic energy of your car and returns it as electrical power to the vehicle, increasing its efficiency. Analysis of regenerative braking efficiency a case study of two electric vehicles operating in the rotterdam area article pdf available september 2011 with 4,429 reads how we measure reads.
Pedestrian detection systems with automatic braking functionality have the. It is used alongwith the conventional braking system in modern electric hybrid vehicles. Analysis of fault diagnosis of regenerative braking system. Energy efficient electric vehicle using regenerative braking. Comparison of fmvss 5 and ece rh concerning electric. The magic of tesla roadster regenerative braking tesla.
Project report on regenerative braking system brake vehicles. For example, if the battery or the system controlling the regenerative braking failed, then. In the existing studies, automakers, parts manufacturers, and researchers worldwide have carried out a series of research and development in system design and. For regenerative braking system, there are three important topics, namely the system design, blended brake control, and energy efficiency evaluation, which are worthwhile researching. Jul 27, 2014 hydraulic regenerative braking system to improve the vehicle fuel economy an alternative regenerative braking system is being developed by the ford motor company and the eaton corporation. Technologies regenerative braking in 50 hz, 25 kv systems. Regenerative braking translates to energy savings, as it recovers. Ac systems are generally better fitted for recovery than dc systems due to higher catenary voltage leading to lower losses. Energy recovery systems in cars and detail study of. In the detail study, different manufacturers and types of systems were examined. Simulation of transit bus regenerative braking systems. It is common in electric vehicles to combine both mechanical braking and regenerative braking functions into a single foot pedal. Instead of the surplus energy of the vehicle being wasted as unwanted heat, the motors act as generators and return some of it to the overhead wires as electricity.
The traction control system is excellent, and it is a good feature to be able to adjust the regenerative braking to low in snowy conditions. Share tweet synopsis on regenerative braking system abstract. Apr 11, 2020 the regenerative braking system is an advanced and supplementary braking system. Tesla, toyota, volkswagen, and mercedes use regenerative braking technology.
Although the regenerative braking system can only be used on the drive wheels of the car, which in most cases is only two, it is still very effective and efficient. The process of applying brakes can be termed as braking. In lowspeed, stop andgo traffic where little deceleration is required. Energy recovery systems in cars and detail study of flywheel. Aug 22, 2015 the traction control system is excellent, and it is a good feature to be able to adjust the regenerative braking to low in snowy conditions. Regenerative braking is the recovery of kinetic energy during braking. At low speeds regenerative braking is not effective and may fail to stop the vehicle in the required time, especially in an emergency. Regenerative braking is used in vehicles that make use of electric motors, primarily fully electric vehicles and hybrid electric vehicles. The research papers available for viewing and reference on internet search engines and. Most road vehicles with regenerative braking only have power on some wheels as in a 2wd car and regenerative braking power only applies to such wheels, so in order to provide controlled braking under difficult conditions such as in wet roads friction based braking is necessary on the other wheels.
77 1305 165 775 1102 441 1023 1528 1154 251 1542 1420 231 339 1478 565 594 1298 760 1316 971 868 430 1218 1633 1040 1481 298 594 960 1196 527 865 813 707 652 157 1178