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