AbstractThe energy storage density of hydraulic accumulators is significantly lower than energy storage devices in other energy domains. As a novel solution to improve the energy density of hydraulic systems, a flywheel-accumulator is presented. Energy is stored in the flywheel-accumulator by compressing a gas, increasing the moment of inertia of the flywheel by adding …
In hydraulic energy storage devices, when the vehicle brakes, hydraulic oil is pumped into the energy storage device to store hydraulic energy and provide braking torque. ...
Aiming at a series hydraulic hybrid vehicle, the mathematical model and Matlab/Simulink simulation model of the vehicle are established, and the energy management strategy based on rules is put forward. ... The accumulator arranged between the variable pump and the variable pump/motor is an energy storage device, which can drive the vehicle ...
Presently, excavators are considered to be good candidates for the installation of energy storage devices such as battery or ultracapacitors. This is perhaps due to size of the machines which require smaller and lower cost storage devices as compared to mining trucks. ... Hybrid hydraulic vehicles offer the benefit of regeneration and the ...
The energy storage device (hydraulic accumulator) is connected to the output end of the wind turbine. The system absorbs energy fluctuations through the storage and release of seawater in the accumulator. At the same time, the entire system is directly connected to the grid through a synchronous generator without the need for a power converter. ...
Vehicles achieve greater fuel economy and lower emissions by: Operating the primary energy and the secondary energy source for peak power; Installing an appropriate secondary energy storage device; Capturing braking energy that is normally wasted as heat by capturing its kinetic energy into the secondary energy device
Some scholars argued that the introduction of hydraulic energy into vehicle drive systems has the advantages of high-power density and high energy efficiency [18, 19]. Vehicle intelligence is a major trend in current and future technological development, and reasonable and effective control of vehicle operation is the basis for intelligence [ 20 ].
Kinetic energy storage devices have been in use since ancient times — pottery wheels and spinning wheels being some of the examples. Flywheels have been used with steam engines and internal combustion engines to smoothen the fluctuating torque produced by the reciprocating motion of the pistons of such machines. ... In this system, hydraulic ...
In order to increase the regenerative braking energy recovery and the dynamic performance of vehicle, the hydraulic braking energy recovery system is confirmed to use with the storage battery ...
The invention relates to a hydraulic electromagnetic generation device for collecting idle kinetic energy of vehicles, which comprises a protective cover, an energy collector, a one-way valve, a hydraulic motor, an electromagnetic generator, an energy storage device, a pipeline and a buffer device, wherein the buffer device is used for controlling flow rate of fluid in the pipeline, and the ...
In power transmission, hydraulic drive systems have a high power density. Hydraulic pumps, as energy sources in hydraulic drive systems, are widely used due to their high working pressure and high flow rate. The hydraulic accumulator (HA) is a device that is used to store energy in the hydraulic system in the form of pressure energy.
HEV makes an appearance in today''s vehicular industry due to low emission, less fuel intake, low-level clangour, and low operating expenses. This paper presents an …
A energy recovery system using a rotating flywheel seems to be advantageous for vehicle applications due to its high energy density. The authors propose a Constant Pressure System (CPS) which is a simple hydraulic drive system for enginefl ywheel hybrid vehicles. CPS can easily realize power transmission and vehicle traction control.
Zeng Xiaohua et al. of Jilin University added hydraulic pump, wheel hub hydraulic motor, accumulator and other devices to form a new type of liquid-driven hybrid …
Compared to conventional transportation technologies that are driven by internal combustion engines and utilize gasoline tanks for energy storage, hybrid electric vehicles use onboard energy-storage systems such as flywheels, ultra-capacitors, batteries and hydrogen storage tanks for fuel cells.
From an in-depth study of vehicle electronic technology, an effective method of overcoming these issues is to adopt the battery in conjunction with high-power-density energy storage devices, such as a HESS, SC, and flywheel [58, 147]. How to coordinate the high-frequency current recovery between different ESSs, especially during emergency ...
CPR can be either increase or decrease by using hydraulic transformer as control device. There are a number of literatures focusing on design and energy efficiency of hydraulic hybrid vehicle …
Therefore in this study an electric-hydrostatic energy storage system is proposed to replace hydraulic accumulator in a hydraulic hybrid wheel loader. Through active …
In the papers [2], [3] simulations have been performed on a hydraulic energy storage system composed of a single variable displacement pump/motor and hydro-pneumatic accumulators that allow regenerative braking, the energy storage and to uncouple the engine from the road load. Simulation results confirm significant improvement in fuel economy ...
Due to the difference between the potential energy in the boom cylinder and the energy in electric storage devices, electric ERS is forced to use equipment to convert energy from hydraulic energy to electrical energy. Therefore, hydraulic motor and generator are two indispensable devices and are used in all electrical ERSs as presented in Fig ...
Wave energy collected by the power take-off system of a Wave Energy Converter (WEC) is highly fluctuating due to the wave characteristics. Therefore, an energy storage system is generally needed to absorb the energy fluctuation to provide a smooth electrical energy generation. This paper focuses on the design optimization of a Hydraulic Energy …
The power/mass ratio in the set of ultracapacitors was 2.21 kW/kg and 2.69 kW/kg in the hydraulic accumulator. The cost/power ratio is 217 US$/kW in the ultracapacitors and 75 US$/kW in the hydraulic accumulator. Based on these results, the hydraulic accumulator was selected as the energy storage device for the system. A testbench was designed ...
This paper presents a comprehensive optimization procedure of a series electric hydraulic hybrid vehicle powertrain and control through the interactive adaptive-weight genetic algorithm method. The optimization simultaneously maximizes the driving range and battery lifespan, while minimizing onboard energy storage system mass.
The introduction and development of efficient regenerative braking systems (RBSs) highlight the automobile industry''s attempt to develop a vehicle that recuperates the energy that dissipates during braking [9], [10].The purpose of this technology is to recover a portion of the kinetic energy wasted during the car''s braking process [11] and reuse it for …
The electric load in a hybrid vehicle comprises of traction load and nontraction load [].Regarding traction load, the energy storage is only responsible to supply an intermittent peak power which may be from a few seconds, such as in hard acceleration, steep hill climbing, obstacle negotiation, etc., to several minutes, such as in cross-country operation, medium hill …
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