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Hydraulic Hybrids: A new economical and environment friendly solution to improve fuel efficiency - Research Paper Example


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Hydraulic Hybrids: A new economical and environment friendly solution to improve fuel efficiency

The main components of a hydraulic hybrid system are vehicle engine, motor/pump, accumulators, low-pressure tank, twin high pressure tank, hydraulic drive train and hydraulic transmission. A hydraulic transformer is also included in some of the systems in order to minimize the low power losses by converting output flow at any pressure. Hydraulic hybrid is identical to electric hybrid systems regarding the principle of working. In electric hybrids, kinetic energy is stored in batteries during the braking operation. This energy is used to run the motor which assists the engine in powering the vehicle. Hydraulic hybrid systems utilize the energy from regenerative braking to pump a working fluid into an accumulator in pressurized form. This pressurized working fluid later assists the engine by providing energy to a pump which powers the vehicle (Gilles, 223). Economic Advantages Hydraulic hybrid systems work best for urban transport vehicles or waste management vehicles which are required to stop at small intervals. Whenever driver applies brakes, pump forces the hydraulic fluid from the low pressure tank to the twin high pressure tank, thus energy is stored every time brakes are applied. In this way up to 70 percent of the energy used in the braking action of the vehicle is again utilized by the vehicle (figure 1). Hydraulic hybrid systems have a number of advantages over other hybrid systems and traditional engines. These systems have a much better power to weight ratio thus the heavier vehicles

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which require a lot of power for starting motion have an added advantage with hydraulic systems. Such high power cannot be provided by the batteries of electric hybrid systems. Moreover in conditions of excessive braking, batteries can only be partially utilized and cannot store energy effectively, whereas accumulators can store up to 70% of the energy dissipated in braking. A considerable market advantage is provided by the lighter weight of hydraulic hybrids than electric hybrids because of improvements in fuel economy and maximization of payload (figure 2). The cost of buying as well as the maintenance cost of hydraulic hybrid systems is also very low with much more reliable components than other hybrid systems. Since the weight and sizes are small, these components can easily be fitted in the vehicles with minor modifications. The service life of hydraulic hybrids is much greater than that of electric hybrid systems which adds to the number of economic advantages it offers. The life of the brakes of the vehicles is also increased because of lesser usage (Bennett, 747). Another additional advantage of the components of hydraulic hybrid systems is their safe use with no risks of self-ignition, fire or shock. The pressure in hydraulic accumulators is easily and safely discharged for storage and maintenance whereas automatic programming is also very easy in case of hydraulic accumulators for discharge in case the vehicle is switched off, enabling fuel economy. Environmental Advantages Since the carbon footprint associated with the operation as well as the manufacturing of hydraulic hybrids is very low, therefore it is a clean technology which utilizes readily recycled materials and fluids. The increase in fuel efficiency also reduces the carbon dioxide emissions. Additionally, there are no problems associated with the disposal of batteries as in case of electric hybrid systems. These systems not only conserve environment, but also depict better stability towards environmental conditions. Hydraulic hybrids can work much more efficiently in intense operating temperatures and climates. They are very less affected by extreme heat, cold and moisture


A hydraulic hybrid vehicle is the one in which a hydraulic system is coupled with the normal working of the vehicle in order to improve its efficiency.This is done by storing the hydraulic energy in specially designed accumulators through a motor assembly…
Author : rippinceasar
Hydraulic Hybrids: A new economical and environment friendly solution to improve fuel efficiency
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