Three day modern extrication training course outline. During regeneration the vehicles kinetic energy that is normally lost during braking is captured and used to drive the pumpmotor as a pump. 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. Hydraulic hybrid systems have been developed for commercial road vehicles and some vehicles have successfully been introduced into daily service 911. 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. Design optimization of a hydraulic flywheel accumulator. Another hybrid option has been put forth and tested by a number of businesses, as well as the environmental protection agency epa. The pump action transfers hydraulic fluid from a lowpressure.
The following technical papers and fact sheets provide information about nrels hydraulic hybrid fleet vehicle evaluations refuse trucks. Hydraulic hybrids are able to capture and reuse 7080% of. A hydrostatic dynamometer has been constructed to test a hydraulic hybrid passenger vehicle. Hydraulic hybrid vehicle publications transportation. The technology, which uses hydraulics instead of electrical components to aid an internal combustion engine, is said to offer big efficiency benefits. 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. Energy efficiency comparison between hydraulic hybrid. The paper focusses on a hybrid system with realistic parameters concerning mass, power, and energy. Hydraulic and pneumatic hybrid powertrains for improved fuel economy in vehicles abstract. Design optimization of a hydraulic flywheel accumulator for a. Eaton, epa showcase new fuelsaving hydraulic hybrid ups. 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. In a regular vehicle, power is provided to the wheels by the engine through the transmission and drive shaft.
Optimized production vehicles are expected to have larger nox reductions. A simulation study of power management for a series hydraulic. In our hybrid vehicle, we just capture that as regenerative braking energy. The retrofit is a parallel hybrid system that sits between the transmission and rear axle. If you need captions, please click the cc button on the player to turn them on. 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. Introduction to how hydraulic hybrids work howstuffworks.
Commonly used by trucks, buses with frequent stops. 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. This paper outlines energy loss equations and design constraint equations that are needed to apply optimization techniques to the valve design. It contributes to the discussion concerning whether a hydrostatic recuperation system can be an alternative to electric systems using doublelayer capacitors or flywheels.
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. This paper outlines a complex simulation model for parallelhybrid diesel railcars with hydrodynamic power transmission. Hybrid electrical vehicles introduction a hybrid electric vehicle hev has two types of energy storage units, electricity and fuel. 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. Dynamicprogramming hydraulic hybrid vehicle power management rule based. 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. Jan 23, 2010 the retrofit is a parallel hybrid system that sits between the transmission and rear axle. Recent trends hydraulic hybrid vehicles ankush menat. Pdf hydraulic hybrid vehicle configurations and comparison with. A gaselectric hybrid recovers 30 percent of braking energy, while a hydraulic hybrid can recover 70 percent, contributing to better efficiency source. 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. It uses the momentum of the truck to compress hydraulic fluid when slowing the vehicle and then releases. Optimal design of a highspeed onoff valve for a hydraulic.
This is a multiterm project, and the ultimate goal is to convert it into the worlds first hydraulic. Electronics help cut costs of hydraulic hybrid trucks. Electric hydraulic hybrid drivetrain for city vehicles. Hydraulic hybrid vehicle configurations and comparison. Recent trends hydraulic hybrid vehicles ankush menat 2. In some systems, a hydraulic transformer is also installed for converting output flow at any pressure with a very low power loss. In a series hhv, the engine is not directly connected to the wheels. Simulationbased optimization of a series hydraulic hybrid vehicle. A hybrid drivetrain with a hydraulic continuously variable transmission cvt is modeled to include efficiency information of the engine and. Hydraulic hybrid systems consist of two key components. The hydraulic hybrid vehicle also achieves approximately 50% lower hydrocarbon and 60% lower particulate matter in laboratory tests. The basic models of hydraulic hybrid vehicles are shown and explained.
This video explains the benefits of hydraulic hybrid vehicle or hhv technology. Optimal design of powersplit transmissions for hydraulic. Pdf n this paper three basic configurations of hydraulic hybrid vehicle are explained. The pressure is on as ups adds more hydraulic hybrids wired. One method of achieving this is to use hydraulic regenerative braking systems to store energy in pressurized fluids. This corresponds to a 20 ton decrease in co2 emissions per vehicle per year. 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. Use of plugin hybrid electric vehicles phevs allows the limited use of. 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.
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. How series hydraulic hybrid vehicles work clean automotive. An overview of literature for parallel, series and powersplit hydraulic hybrid vehicle is presented. Hydraulic hybrid our patented hydraulic launch assist or hla hydraulic hybrid system has two main parts. 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. Redesigning the current regenerative hydraulic braking. Design and analysis of hydraulic hybrid passenger vehicles. Hydraulic hybrid vehicle systems consists of four main components. For trucks and buses, this can also be less expensive than electric systems, due. Sound during engine restarts the, the hydraulic pump.
Hydromechanical transmission hmt based hybrid hydraulic vehicle architecture is potentially more efficient than other architectures because. Hhvs, like all hybrid vehicles, use two sources of power to drive the wheels. This prototype vehicle has also demonstrated modest reductions in nox emissions. 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. Pdf model of a hydraulic hybrid vehicle with regenerative. 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. Operate hydraulic, pneumatic or electric power car hoists strictly according to manufacturers. 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. What are hydraulic hybrids first used in 1982 hydraulic hybrids are similar to electric hybrids but use fluid instead of electricity. The technology, which uses hydraulics instead of electrical components to aid an internal combustion engine, is. Alternative fuels and advanced vehicle technologies for. Are hydraulic hybrid vehicles the future of driving.
This research project compares laboratorymeasured fuel economy of a mediumduty diesel powered hydraulic hybrid. Explore hydraulic hybrid vehicle with free download of seminar report and ppt in pdf and doc format. A brief overview of the most recently published papers in this area. Hydraulic hybrid vehicles are equipped with an accumulator for energy storage. Hydraulic hybrid vehicle seminar report, ppt, pdf for. Investigating an allhydraulic hybrid system for diesel. 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. The following technical papers and fact sheets provide information about nrels hydraulic hybrid fleet vehicle evaluations.
Hydraulic hybrid and conventional parcel delivery vehicles. Hybrid vehicle introduction provides students with knowledge of theory and physical description of. Hydraulic hybrid vehicles california clean air technology. 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. Pdf this paper explains the basic principles of hydraulic hybrid vehicles. Jim obrien, of hybriddrive systems, in deerfield michigan, converted a 1968 volkswagen beetle into a hydraulic hybrid. Hybrid vehicles use two sources of power to drive the wheels. Traditional electric hybrid vehicles combine internal combustion engine power plants with electric motorsgenerators to propel the vehicle or capture its braking energy. 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. Once relegated to the sidelines due to bulky components and complicated controls, these systems are benefiting from. 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. Similar to electric hybrids, hydraulic hybrids are either series or parallel. Hydraulic hybrid vehicles hhvs are mainly operated using engines. In some of these cars, fluid hydraulic technology is used as an additional source of power along with diesel or gas these are.
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. 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. Obrien said, we are not aware of anything else like it. Also included in these two days is a tour of new vehicles that possess the features studied in. 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. Electrichydraulic hybrid drivetrain for city vehicles. Hydraulic hybrid research clean automotive technology. They capture and reuse 7080% of the vehicles brakingdecelerating energy compared to 55% for electric hybrids. In a hydraulic hybrid, pressurized fluid is used as secondary source of power. Vehicles in this study included a model year 2012 freightliner p10hh hybrid. 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. 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. It uses the momentum of the truck to compress hydraulic.
An overview of literature for parallel, series and powersplit. A study on control strategy of regenerative braking in the. 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. 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. Jacek, development and simulation of a hydraulichybrid powertrain for use in commercial heavy vehicles, sae paper 20030370. 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.
An approach for optimizing the configuration and sizing of a hydraulic hybrid powersplit transmission is proposed. Evaluating the performance of hydraulic hybrid refuse vehicles. Kepner, hydraulic power assista demonstration of hydraulic hybrid vehicle regenerative braking in a road vehicle application, sae paper 20020128. In a hydraulic hybrid vehicle hhv a regular internal combustion engine and a hydraulic motor are used to power the wheels. The three most common categories of hydraulic hybrid vehicle. Part of the lecture notes in electrical engineering book series lnee. This video clip is an excerpt from nfpas fluid power. Design and construction of a hydrostatic dynamometer for. For further popularization of hybrid excavators, we updated the hybrid components in late 20102, 20 and carried out a full model change. Upss fleet of iconic brown delivery vans is getting a little bit greener with the addition of some new hybrid trucks. 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.
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