In some of these cars, fluid hydraulic technology is used as an additional source of power along with diesel or gas these are. Alternative fuels and advanced vehicle technologies for. Electronics help cut costs of hydraulic hybrid trucks. Hydraulic hybrid vehicle seminar report, ppt, pdf for. Design and analysis of hydraulic hybrid passenger vehicles. In some systems, a hydraulic transformer is also installed for converting output flow at any pressure with a very low power loss. Electricity means that a battery sometimes assisted by ultracaps is used to store the energy, and that an electromotor from now on called motor will be used as traction motor. The following technical papers and fact sheets provide information about nrels hydraulic hybrid fleet vehicle evaluations. Energy efficiency comparison between hydraulic hybrid. Hydraulic hybrid systems consist of two key components. Hydraulic hybrid systems have been developed for commercial road vehicles and some vehicles have successfully been introduced into daily service 911. The retrofit is a parallel hybrid system that sits between the transmission and rear axle. This research project compares laboratorymeasured fuel economy of a mediumduty diesel powered hydraulic hybrid. Hydraulic drive systems are convenient for some few specific purposes, but they lose a tremendous amount of power to heat, especially as the hydraulic fluid is forced around corners and through restrictions.
The vehicle uses hydraulic pump motors and hydraulic storage tanks to recover and store energy, similar to what is done with electric motors and batteries in hybrid. A gaselectric hybrid recovers 30 percent of braking energy, while a hydraulic hybrid can recover 70 percent, contributing to better efficiency source. A simulation study of power management for a series hydraulic. Sound during engine restarts the, the hydraulic pump. Jan 23, 2010 the retrofit is a parallel hybrid system that sits between the transmission and rear axle. Hydraulic and pneumatic hybrid powertrains for improved fuel economy in vehicles abstract. Obrien said, we are not aware of anything else like it. Recent trends hydraulic hybrid vehicles ankush menat.
Hydraulic hybrid vehicle systems consists of four main components. The hydraulic hybrid vehicle also achieves approximately 50% lower hydrocarbon and 60% lower particulate matter in laboratory tests. Series hydraulic hybrid system wherein the pump is directly connected to the driveshaft. The technology, which uses hydraulics instead of electrical components to aid an internal combustion engine, is. Introduction to how hydraulic hybrids work howstuffworks. The epa estimates that co2 emissions from hydraulic hybrid ups trucks are 40 percent lower than conventional ups trucks, and a fleet of trucks could save 1,000 gallons of fuel a year. That normally charges the accumulator, acts as a motor by going over center taking high pressure accumulator oil, and then using it to drive the engine, just like an electronic starter does, starting the engine. Part of the lecture notes in electrical engineering book series lnee. Hhvs, like all hybrid vehicles, use two sources of power to drive the wheels. Pdf this paper explains the basic principles of hydraulic hybrid vehicles. Hydraulic hybrid vehicle publications transportation. Jul 20, 2017 12 hydraulic hybrids that go heavy duty the littleknown hydraulic hybrid powertrain is alive and well, and slowly making inroads in heavyduty vehicles. Hydraulic hybrid and conventional parcel delivery vehicles.
Traditional electric hybrid vehicles combine internal combustion engine power plants with electric motorsgenerators to propel the vehicle or capture its braking energy. Design optimization of a hydraulic flywheel accumulator for a. Hybrid vehicles use two sources of power to drive the wheels. Evaluating the performance of hydraulic hybrid refuse vehicles.
In a hydraulic hybrid vehicle hhv a regular internal combustion engine and a hydraulic motor are used to power the wheels. Eaton, epa showcase new fuelsaving hydraulic hybrid ups. Hydraulic hybrid vehicles are equipped with an accumulator for energy storage. In a parallel hydraulic hybrid there is a conventional engine and drive train system with hydraulic hybrid technology attached to the drive shaft to learn more visit how parallel hhvs works. The three most common categories of hydraulic hybrid vehicle. They capture and reuse 7080% of the vehicles brakingdecelerating energy compared to 55% for electric hybrids. It uses the momentum of the truck to compress hydraulic. Design and construction of a hydrostatic dynamometer for. Hydraulic powersplit architecture is chosen in this study for its flexibility in operation and combined advantage of series and parallel architecture. Hybrid vehicles provide a solution to this demand, and hydraulic hybrid vehicles are shown to have a cheaper cost of ownership compared to electric hybrid vehicles. It contributes to the discussion concerning whether a hydrostatic recuperation system can be an alternative to electric systems using doublelayer capacitors or flywheels.
The pc master software referenced in this document is also known as free master software. Also included in these two days is a tour of new vehicles that possess the features studied in. For further popularization of hybrid excavators, we updated the hybrid components in late 20102, 20 and carried out a full model change. A study on control strategy of regenerative braking in the. Hydraulic hybrid vehicles are the future vehicle as it is more better and efficient than the traditional cars as hydraulics systems can recover about 75% of the kinetic energy during braking and deceleration, as compared to the 25% recovery from electric hybrids and its proven to be more costeffective than electric hybrid systems. Hybrid vehicles reduce their fuel consumption by capturing energy normally lost during braking and reusing it during acceleration in addition to managing the engine to enable it. Use of plugin hybrid electric vehicles phevs allows the limited use of. The basic models of hydraulic hybrid vehicles are shown and explained. In the series hydraulic hybrid truck, a highefficiency diesel engine is combined with a unique hydraulic propulsion system to replace the conventional drivetrain and transmission. Kepner, hydraulic power assista demonstration of hydraulic hybrid vehicle regenerative braking in a road vehicle application, sae paper 20020128.
Eaton to begin providing hydraulic hybrid retrofit kit in 2010. The payload estimate used for testing is the result of discussions with ups as an average daily load and is directly comparable to a previous dynamometer test series 3, 6. Hydraulic hybrids use many of the same principles as electric hybrids, but instead of using potentially pollutive and heavy batteries, they use lightweight components and clean fluid to power. Hydraulic hybrid vehicles california clean air technology. How series hydraulic hybrid vehicles work clean automotive. This video clip is an excerpt from nfpas fluid power. Hydraulic hybrid research clean automotive technology. An overview of literature for parallel, series and powersplit hydraulic hybrid vehicle is presented. During regeneration the vehicles kinetic energy that is normally lost during braking is captured and used to drive the pumpmotor as a pump. Operate hydraulic, pneumatic or electric power car hoists strictly according to manufacturers.
This prototype vehicle has also demonstrated modest reductions in nox emissions. Jacek, development and simulation of a hydraulichybrid powertrain for use in commercial heavy vehicles, sae paper 20030370. Optimal design of a highspeed onoff valve for a hydraulic. Hydraulic hybrid vehicle configurations and comparison. Optimal design of powersplit transmissions for hydraulic. Simulationbased optimization of a series hydraulic hybrid vehicle. The paper focusses on a hybrid system with realistic parameters concerning mass, power, and energy. Pdf n this paper three basic configurations of hydraulic hybrid vehicle are explained. Electrichydraulic hybrid drivetrain for city vehicles. How series hydraulic hybrid vehicles work in a regular vehicle, power is provided to the wheels by the engine through the transmission and drive shaft. Explore hydraulic hybrid vehicle with free download of seminar report and ppt in pdf and doc format.
Hydromechanical transmission hmt based hybrid hydraulic vehicle architecture is potentially more efficient than other architectures because. In a series hhv, the engine is not directly connected to the wheels. Redesigning the current regenerative hydraulic braking. The pressure is on as ups adds more hydraulic hybrids wired. Hydraulic hybrids are able to capture and reuse 7080% of. Are hydraulic hybrid vehicles the future of driving. Pdf model of a hydraulic hybrid vehicle with regenerative. Electric hydraulic hybrid drivetrain for city vehicles. What are hydraulic hybrids first used in 1982 hydraulic hybrids are similar to electric hybrids but use fluid instead of electricity. In laboratory tests, the city fuel economy of the hydraulic hybrid ups vehicle is 60% to 70% increased miles per gallon compared to a conventional ups truck. Hydraulic hybrid vehicles a hybrid vehicle is a vehicle that uses more than one source of power for functioning or movement. Hybrid vehicle introduction provides students with knowledge of theory and physical description of. A demonstration of hydraulic hybrid vehicle regenerative braking in a road vehicle application 20020128 with the desire for improved fuel economy for road vehicles, there has been increased interest in hydraulic hybrid vehicle hhv technology.
One method of achieving this is to use hydraulic regenerative braking systems to store energy in pressurized fluids. An overview of literature for parallel, series and powersplit. Investigating an allhydraulic hybrid system for diesel. A brief overview of the most recently published papers in this area.
This video explains the benefits of hydraulic hybrid vehicle or hhv technology. Similar to electric hybrids, hydraulic hybrids are either series or parallel. Also explore the seminar topics paper on hydraulic hybrid vehicle with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. Another hybrid option has been put forth and tested by a number of businesses, as well as the environmental protection agency epa. The ase light duty hybridelectric vehicle specialist certification test reference starting on page 7 in this book is a resource that identifies concepts for the. The xebra is a 3wheeled electric vehicle that looks like a miniutility truck, but it is classified as a motorcycle, legal for driving in the united states. Similar to hybrid electric vehicles hevs, they reduce fuel consumption and emission by regenerating braking power, and by allowing the engine and transmission components to operate more ef.
Hybrid electrical vehicles introduction a hybrid electric vehicle hev has two types of energy storage units, electricity and fuel. An approach for optimizing the configuration and sizing of a hydraulic hybrid powersplit transmission is proposed. Hydraulic hybrid vehicles hhvs are mainly operated using engines. Hydraulic hybrid our patented hydraulic launch assist or hla hydraulic hybrid system has two main parts. Environmental protection agency epa is researching hydraulic hybrid transportation systems in an effort to diminish the pollutants released from emissions and reduce the demand for fossil fuels. The ups pilot vehicle demonstrates the cost effectiveness of hydraulic hybrid technology which can be applied to all trucks that operate in urban environments as well as highway vehicles. Recent trends hydraulic hybrid vehicles ankush menat 2. In our hybrid vehicle, we just capture that as regenerative braking energy. This corresponds to a 20 ton decrease in co2 emissions per vehicle per year. Once relegated to the sidelines due to bulky components and complicated controls, these systems are benefiting from. In a hydraulic hybrid, pressurized fluid is used as secondary source of power.
Dynamicprogramming hydraulic hybrid vehicle power management rule based. The ase light duty hybridelectric vehicle specialist certification test reference starting on page 7 in this book is a resource that identifies concepts for the hybridelectric vehicle technology that will be included in. Design optimization of a hydraulic flywheel accumulator. This paper outlines a complex simulation model for parallelhybrid diesel railcars with hydrodynamic power transmission. A hybrid drivetrain with a hydraulic continuously variable transmission cvt is modeled to include efficiency information of the engine and. This paper outlines energy loss equations and design constraint equations that are needed to apply optimization techniques to the valve design. This is a multiterm project, and the ultimate goal is to convert it into the worlds first hydraulic electric hybrid, a project you can drive at the end of the term. A hydrostatic dynamometer has been constructed to test a hydraulic hybrid passenger vehicle. Jim obrien, of hybriddrive systems, in deerfield michigan, converted a 1968 volkswagen beetle into a hydraulic hybrid. Hybrid vehicles reduce their fuel consumption by capturing energy normally lost during braking and reusing it during acceleration in addition to managing the engine to enable it to run at a higher efficiency operating point. Upss fleet of iconic brown delivery vans is getting a little bit greener with the addition of some new hybrid trucks.
If you need captions, please click the cc button on the player to turn them on. In a regular vehicle, power is provided to the wheels by the engine through the transmission and drive shaft. The pump action transfers hydraulic fluid from a lowpressure. For trucks and buses, this can also be less expensive than electric systems, due. The results of this optimization are presented for a virtually variable displacement pump, and a virtually variable displacement pumpmotor, which is used as the wheel motor of a hydraulic hybrid vehicle. Commonly used by trucks, buses with frequent stops. Optimized production vehicles are expected to have larger nox reductions. The technology, which uses hydraulics instead of electrical components to aid an internal combustion engine, is said to offer big efficiency benefits. Engineers at lightning systems say they have endowed the venerable hydraulic hybrid with greater levels of electronic intelligence, thereby cutting fuel consumption in trucks by 20% and reducing nitrogen oxide emissions by 50%, without a big cost penalty. Vehicles in this study included a model year 2012 freightliner p10hh hybrid.
However, compared to electric batteries, motors and controllers, hydraulic transmission components are extremely robust, have a much higher power density and have much lower manufacturing cost. Pdf hydraulic hybrid vehicle configurations and comparison with. It uses the momentum of the truck to compress hydraulic fluid when slowing the vehicle and then releases. Hydraulic hybrid vehicles, or hhvs use a pressurized fluid power source, along with a conventional internal combustion engine ice, to achieve better fuel economy and reductions in harmful emissions. This is a multiterm project, and the ultimate goal is to convert it into the worlds first hydraulic. The basic layout of a hydrostatic hybrid drive train is shown in the next section, which is followed by a description of a simulation model that has been developed by the.
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