DE2551580A1 - Hydraulic energy store for motor vehicles - has high pressure storage vessel separated from inner low pressure vessel by membrane - Google Patents

Hydraulic energy store for motor vehicles - has high pressure storage vessel separated from inner low pressure vessel by membrane

Info

Publication number
DE2551580A1
DE2551580A1 DE19752551580 DE2551580A DE2551580A1 DE 2551580 A1 DE2551580 A1 DE 2551580A1 DE 19752551580 DE19752551580 DE 19752551580 DE 2551580 A DE2551580 A DE 2551580A DE 2551580 A1 DE2551580 A1 DE 2551580A1
Authority
DE
Germany
Prior art keywords
hydraulic energy
high pressure
pressure storage
pressure accumulator
vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19752551580
Other languages
German (de)
Inventor
Faust Hagin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAN AG
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
Priority to DE19752551580 priority Critical patent/DE2551580A1/en
Publication of DE2551580A1 publication Critical patent/DE2551580A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

The displacement-type machine (1) can be operated either as motor or as pump and is inserted between the connection of the low pressure storage vessel (2) and the high pressure storage vessel (3). The high pressure storage vesses is designed as an enclosed vessel filled with hydraulic fluid separated from the pressurising gas cushion by an elastic diaphragm. As a standby for peak loads the displacement machine is connected to the engine (6) by a mechanical adding gear (4). It is possible to transmit outputs from the displacement motor (1) to the driven axle (5) or to transmit outputs from the engine (6) to the displacement machine operating as a pump and/or to the driven axle.

Description

Hydraulische Energiespeicheranlage Hydraulic energy storage system

für Arbeitsmaschinen Die Erfindung bezieht sich auf eine hydraulisehe Energiespeicheranlage für Arbeitsmaschinen, insbesondere für Kraitfahrzeuge mit einem Hochdruck- und einem Niederdruckspeicherzwischen die eine als Motor und Pumpe betreibbare Verdrängermaschine geschaltet ist. for work machines The invention relates to a hydraulic Energy storage system for work machines, especially for krait vehicles a high pressure and a low pressure accumulator between the one as motor and pump operable displacement machine is switched.

Solche hydraulische Energiespeicheranlagen sind ganz allgemein dazu geeignet, die zu installierende Kraftmaschinenleistung in Arbeitsmaschinen niedrig zu halten; da Spitzenbelastungen der Arbeitsmaschine durch die in der Energiespeicheranlage gespeicherte Energie gedeckt werden können.Such hydraulic energy storage systems are very general suitable, the engine power to be installed in working machines is low to keep; because peak loads on the work machine due to the energy storage system stored energy can be covered.

Die Verwendung hydraulischer Energiespeicheranlagen hat insbesondere bauliche Vorteile, da die * eine Energioumsetzung notwendige Verdrängermaschine verhältnismäßig einfach von einem Betrieb als Motor auf einen Betrieb als Pumpe umstellbar ist. Ein Nachteil von hydraulischen Energiespeicherenlagen liegt d@rin, daß ein Hochdruckspeicher benötigt wird, in dem, wenn gute Wirkungsgrade erzielt werden sollen, Betriebsdrücke von mehreren 100 Atmosphären auftreten, und solch hohe Drücke immer eine gewisse Gefährdung der Umgebung des Hochdruckspeichers darstellen, da eine Zerstörung eines solchen Speichers nie mit hundertprozentiger Sicherheit ausgeschlossen werden kann. Dieser Nachteil fällt besonders dann sehr schwer ins Gewicht, wenn eine hydraulische Energiespeicheranlage in einem Personenfahrzeug, z.B. einem Omnibus angewendet werden soll und mag ein Grund dafür sein, daß bislang solche hydraulische Energiespeicheranlagen auf dem Gebiet der Personenfahrzeuge sich nicht einführen konnten.The use of hydraulic energy storage systems has in particular structural advantages, since the displacement machine necessary for energy conversion relatively easy from operating as a motor to operating as a pump is convertible. A disadvantage of hydraulic energy storage systems is that that a high-pressure accumulator is required, in which if good efficiencies are to be achieved, operating pressures of several 100 atmospheres occur, and Such high pressures always pose a certain risk to the environment of the high-pressure accumulator represent, since a destruction of such a memory never with one hundred percent Security can be ruled out. This disadvantage is particularly noticeable then heavy weight if a hydraulic energy storage system in a passenger vehicle, E.g. an omnibus is to be used and may be a reason for the fact that so far such hydraulic energy storage systems in the field of passenger vehicles could not introduce themselves.

Aufgabe der vorliegenden Erfindung ist es deshalb, eine gattungagemäße hydraulische Energiespeicheranlage so auszubilden, daß selbst dann, wenn durch unvorhergesehene Zwischenfälle eine Zerstörung des Hochdruckspeichers auftritt, eine Gefährdung der Umgebung dieses Speichers vermieden wird.The object of the present invention is therefore to provide a generic to train hydraulic energy storage system so that even if by unforeseen Incidents a destruction of the high-pressure accumulator occurs, a risk to the Environment of this memory is avoided.

Zur Idsung dieser Aufgabe wird erfindungsgemäß vorgeschlagen, daß der Hochdruckspeicher im Innern des Niederdruckspeichers angeordnet ist.To Idsung this object it is proposed according to the invention that the high-pressure accumulator is arranged inside the low-pressure accumulator.

Durch die erfindungsgemäße Ausbildung wird der Niederdruckspeicher praktisch eis energieabsorbierender Mantel um den Hoohdruckspeicher herum verwendet, was konstruktiv und herstellungstechnisch keine Schwierigkeiten bietet, so daf der lehrautwand für die healisierung der erfindungsgemäßen Lösung im Vergleich zu einer herkömmlichen Lösung, bei der der Hochdruckspeicher und der Niederdruckspeicher e-etrennt voneinander angeordnet sind, gering gehalten werden kann.Due to the design according to the invention, the low-pressure accumulator practically ice energy-absorbing jacket used around the high pressure accumulator, what constructive and manufacturing no difficulties offers, so that the teaching wall for the healing of the solution according to the invention compared to a conventional solution in which the high pressure accumulator and the Low-pressure accumulators are arranged separately from one another, are kept low can.

In weiterer huseestaltung der erfindungsgemäßen Energiespeicheranlage soll der Hochdruckspeicher ein Blasenspeicher sein Solche Blasenspeicher sind bekannte und zuverlässige Bauelemente.In a further house design of the energy storage system according to the invention should the high-pressure accumulator be a bladder accumulator Such bladder accumulators are known and reliable components.

Nach einer weiteren Ausgestaltung soll an den Niederdruckspeicher im Bereich des darin gebildeten bruckluftpolsters eine Verbindungsleitung zum Vorratsbehälter einer Druckluftanlage der Arbeitsmaschine angeschlossen sein. Diese Verbindungsleitung zu einer Druckluftanlage der Arbeitsmaschine 9:at den Vorteil, daB der Gegendruck im Niederdruckspeicher ohne zusätzlichen Regelaufwand leicht konstant gehalten werden kann, da davon ausgegangen werden kann, daß der Druck in einer arbeitsmaschineneigenen Druckluftanlage durch ohnehin vorhandene Regelgeräte innerhalb vorbestimmter Grenzen konstant gehalten wird.According to a further embodiment, the low-pressure accumulator is supposed to in the area of the compressed air cushion formed therein a connecting line to the storage container be connected to a compressed air system of the machine. This connecting line to a compressed air system of the machine 9: there is the advantage that the counter pressure can easily be kept constant in the low-pressure accumulator without additional control effort can, since it can be assumed that the printing in a work machine's own Compressed air system through already existing control devices within predetermined limits is kept constant.

imine besondere Ausführungsform einer hydraulischen znergiespeicheranlage soll dadurch gekennzeichnet sein, daß die Druckluftanlage die Bremsanlage eines Kraftfahrzeugs ist.imine a special embodiment of a hydraulic energy storage system should be characterized in that the compressed air system is the braking system of a Motor vehicle is.

Die Kombinstion der Bremsanlage eines Eraftfahrzeugs mit einer hydraulischen fliergiespeicheranlage bietet sich als besonders vorteilhafte Lösung an, da insbesondere für Bremsanlagen von Kraftfahrzeugen eine hohe Konstanz des in den Vorratsbehältern gehaltenen Druckes gegeben ist.The combination of the braking system of an electric vehicle with a hydraulic one Fliergiespeicheranlage offers itself as a particularly advantageous solution, since in particular for braking systems of motor vehicles a high degree of constancy in the storage containers held pressure is given.

Anhand der beigefügten Zeichnung wird ein Ausführungsbeispiel einer erfindungsgemäßen Energiespeicheranlage erläutert: Sine als Motor und Pumpe betreibbare Verdrängermaschine 1 ist bei der in der Zeichnung dargestellten Energiespeicheranlage zwischen einem Niederdruckspeicher 2 und einem liochdruckspeicher 3 geschaltet. Der Hochdruckspeicher 3 ist ein Blasenspeicher üblicher Bauart. Die hydraulische Energiespeicheranlage ist in einem Kraftfahrzeug eingebaut, um Spitzenlasten zu decken. Hierzu ist die Verdrängermaschine 1 summier an ein Differentislgetriebe 4 angeschlossen, über das einmal Leistung von der Verdrängermaehhine 1 auf die Äntriebsachse 5 übertragen werden kann, über das andererseits Leistung von einer Verbrennungskraftmaschine 6 sowohl auf die Verdrängermaschine 1 als auch auf die Antriebsachse 5 übertragen werden kann.Based on the accompanying drawing, an embodiment of a Energy storage system according to the invention explained: Sine operable as a motor and pump Displacement machine 1 is in the energy storage system shown in the drawing connected between a low pressure accumulator 2 and a high pressure accumulator 3. The high-pressure accumulator 3 is a conventional type of bladder accumulator. The hydraulic Energy storage system is installed in a motor vehicle to handle peak loads cover. For this purpose, the displacement machine 1 is added to a differential gear 4 connected, over the once power from the displacement machine 1 to the drive axis 5 can be transmitted, on the other hand, power from an internal combustion engine 6 is transmitted both to the displacement machine 1 and to the drive axle 5 can be.

An den Niederdruckapeicher 2 ist im Bereich des darin gebildeten Luftpolsters 21 eine Verbindungsleitung 22 zu einet Vorratsbehälter 23 einer fahrzeugeigenen 1)ruckluftanlage angeschlossen. Der Vorratsbehälter 23 soll insbesondere ein Druckluftvorrstsbehälter für die Bremsanlage des Kraftfahrzeugs sein.On the low-pressure tape 2 is in the area of the air cushion formed therein 21 a connecting line 22 to one storage container 23 one vehicle's own 1) return air system connected. The storage container 23 should in particular be a compressed air reservoir for the braking system of the motor vehicle.

L e e r s e i t eL e r s e i t e

Claims (4)

Patentansprüche 1. Hydraulische Energiespeicheranlage für Arbeitsmaschinen insbesondere für Eraftfahrzeuge mit einem Hochdruck-und einem Niederdruckapeicher, zwischen die eine als Motor und Pumpe betreibbare Verdrängermaschine geschaltet ist, , dadurch gekennzeichnet, daß der Hochdruckspeicher (3) im Inneren des Niederdruckspeichers (2) angeordnet ist. Claims 1. Hydraulic energy storage system for work machines especially for vehicles with a high-pressure and a low-pressure reservoir, connected between a displacement machine that can be operated as a motor and pump is, characterized in that the high-pressure accumulator (3) is inside the low-pressure accumulator (2) is arranged. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daB der Hochdruckspeicher (3) ein Bissenspeicher ist.2. Device according to claim 1, characterized in that the high-pressure accumulator (3) is a bite memory. 3. Vorrichtung nach Anspruch 1 oder Anspruch 2, dadurch gekennzexchnet, daß an den Niederdruckspeicher (2) im Bereich des darin gebildeten Druckluftpolsters (21) eine Verbindungsleitung (22) zum Vorratsbehälter (23) einer DruckluStanlagc der Arbeitsmaschine angeschlossen igt.3. Device according to claim 1 or claim 2, characterized in that that to the low pressure accumulator (2) in the area of the compressed air cushion formed therein (21) a connecting line (22) to the storage container (23) of a compressed air system connected to the working machine. 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Druckluftanlage die Bremsanlage eines Kraftfahrzeugs ist.4. Apparatus according to claim 3, characterized in that the compressed air system is the braking system of a motor vehicle.
DE19752551580 1975-11-17 1975-11-17 Hydraulic energy store for motor vehicles - has high pressure storage vessel separated from inner low pressure vessel by membrane Pending DE2551580A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752551580 DE2551580A1 (en) 1975-11-17 1975-11-17 Hydraulic energy store for motor vehicles - has high pressure storage vessel separated from inner low pressure vessel by membrane

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DE19752551580 DE2551580A1 (en) 1975-11-17 1975-11-17 Hydraulic energy store for motor vehicles - has high pressure storage vessel separated from inner low pressure vessel by membrane

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DE2551580A1 true DE2551580A1 (en) 1977-05-26

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028847A1 (en) * 1980-07-30 1982-03-04 Günter Dipl.-Ing. 5960 Olpe Klemm Short duration energy accumulator for vehicles - has hydropneumatic pressure accumulator, coupled by hydraulic line to motor-pump set in connection with drive shaft
EP0047643A1 (en) * 1980-09-04 1982-03-17 Advanced Energy Systems Inc. Fuel-efficient energy storage automotive drive system
FR2507837A1 (en) * 1981-06-11 1982-12-17 South African Inventions ENERGY TRANSMISSION SYSTEM FOR BATTERY-POWERED ELECTRIC VEHICLES
DE3129160A1 (en) * 1981-07-23 1983-02-10 Kraftwerk Union AG, 4330 Mülheim Electrohydraulic actuator for turbine valves
DE3129125A1 (en) * 1981-07-23 1983-02-10 Kraftwerk Union AG, 4330 Mülheim Electrohydraulic actuator for turbine valves
EP0075035A1 (en) * 1981-09-19 1983-03-30 Kappmeier, Uwe H., Ing.-grad. Transmission, particularly for vehicle
US4441573A (en) * 1980-09-04 1984-04-10 Advanced Energy Systems Inc. Fuel-efficient energy storage automotive drive system
WO1987001993A1 (en) * 1985-09-27 1987-04-09 Volvo Flygmotor Ab Control method and device for a regenerative drive system, particularly for vehicles
DE3619639A1 (en) * 1986-06-11 1987-12-17 Man Nutzfahrzeuge Gmbh SYSTEM WITH ENERGY STORAGE AND DELIVERY DEVICE
US4741410A (en) * 1985-07-05 1988-05-03 Advanced Energy Systems Inc. Energy storage automotive drive system particularly adaptable for retrofitting
DE102006019672A1 (en) * 2006-04-27 2007-11-08 Robert Bosch Gmbh Hydraulic fluid accumulator with integrated high pressure and low pressure chamber
US8087733B2 (en) 2008-12-09 2012-01-03 Développement Effenco Inc. Braking energy recovery system for a vehicle and vehicle equipped with the same
CN102597534A (en) * 2009-10-05 2012-07-18 罗伯特·博世有限公司 Energy storage system including an expandable accumulator and reservoir assembly
WO2012105933A1 (en) * 2011-01-31 2012-08-09 Vanderbilt University Elastic hydraulic accumulator/reservoir system
US8434524B2 (en) 2011-01-31 2013-05-07 Vanderbilt University Elastic hydraulic accumulator/reservoir system
US8826940B2 (en) 2009-04-06 2014-09-09 Vanderbilt University High energy density elastic accumulator and method of use thereof
US8840524B2 (en) 2012-01-11 2014-09-23 Développement Effenco Inc. Fuel saving system that facilitates vehicle re-starts with the engine off
US9010101B2 (en) 2011-02-03 2015-04-21 Vanderbilt University Multiple accumulator systems and methods of use thereof
US9249847B2 (en) 2011-12-16 2016-02-02 Vanderbilt University Distributed piston elastomeric accumulator
US10703356B2 (en) 2016-02-16 2020-07-07 Développement Effenco Inc. Expanded functionality stop-start fuel saving system for vocational vehicles

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028847A1 (en) * 1980-07-30 1982-03-04 Günter Dipl.-Ing. 5960 Olpe Klemm Short duration energy accumulator for vehicles - has hydropneumatic pressure accumulator, coupled by hydraulic line to motor-pump set in connection with drive shaft
EP0047643A1 (en) * 1980-09-04 1982-03-17 Advanced Energy Systems Inc. Fuel-efficient energy storage automotive drive system
US4441573A (en) * 1980-09-04 1984-04-10 Advanced Energy Systems Inc. Fuel-efficient energy storage automotive drive system
FR2507837A1 (en) * 1981-06-11 1982-12-17 South African Inventions ENERGY TRANSMISSION SYSTEM FOR BATTERY-POWERED ELECTRIC VEHICLES
US4534169A (en) * 1981-06-11 1985-08-13 South African Inventions Development Corp. Power transmission system
DE3129160A1 (en) * 1981-07-23 1983-02-10 Kraftwerk Union AG, 4330 Mülheim Electrohydraulic actuator for turbine valves
DE3129125A1 (en) * 1981-07-23 1983-02-10 Kraftwerk Union AG, 4330 Mülheim Electrohydraulic actuator for turbine valves
EP0075035A1 (en) * 1981-09-19 1983-03-30 Kappmeier, Uwe H., Ing.-grad. Transmission, particularly for vehicle
US4741410A (en) * 1985-07-05 1988-05-03 Advanced Energy Systems Inc. Energy storage automotive drive system particularly adaptable for retrofitting
WO1987001993A1 (en) * 1985-09-27 1987-04-09 Volvo Flygmotor Ab Control method and device for a regenerative drive system, particularly for vehicles
DE3619639A1 (en) * 1986-06-11 1987-12-17 Man Nutzfahrzeuge Gmbh SYSTEM WITH ENERGY STORAGE AND DELIVERY DEVICE
DE102006019672A1 (en) * 2006-04-27 2007-11-08 Robert Bosch Gmbh Hydraulic fluid accumulator with integrated high pressure and low pressure chamber
WO2007124882A1 (en) 2006-04-27 2007-11-08 Bosch Rexroth Ag Hydraulic fluid reservoir with integrated high- and low-pressure chamber
DE102006019672B4 (en) * 2006-04-27 2013-11-14 Robert Bosch Gmbh Hydraulic fluid accumulator with integrated high pressure and low pressure chamber
US8087733B2 (en) 2008-12-09 2012-01-03 Développement Effenco Inc. Braking energy recovery system for a vehicle and vehicle equipped with the same
US8826940B2 (en) 2009-04-06 2014-09-09 Vanderbilt University High energy density elastic accumulator and method of use thereof
CN102597534A (en) * 2009-10-05 2012-07-18 罗伯特·博世有限公司 Energy storage system including an expandable accumulator and reservoir assembly
US8991433B2 (en) 2009-10-05 2015-03-31 Robert Bosch Gmbh Energy storage system including an expandable accumulator and reservoir assembly
CN102597534B (en) * 2009-10-05 2015-12-02 罗伯特·博世有限公司 Comprise the energy storage system of inflatable accumulator and memory assembly
US8434524B2 (en) 2011-01-31 2013-05-07 Vanderbilt University Elastic hydraulic accumulator/reservoir system
WO2012105933A1 (en) * 2011-01-31 2012-08-09 Vanderbilt University Elastic hydraulic accumulator/reservoir system
EP2670985A4 (en) * 2011-01-31 2017-03-08 Vanderbilt University Elastic hydraulic accumulator/reservoir system
US9010101B2 (en) 2011-02-03 2015-04-21 Vanderbilt University Multiple accumulator systems and methods of use thereof
US9249847B2 (en) 2011-12-16 2016-02-02 Vanderbilt University Distributed piston elastomeric accumulator
US9920775B2 (en) 2011-12-16 2018-03-20 Vanderbilt University Distributed piston elastomeric accumulator
US8840524B2 (en) 2012-01-11 2014-09-23 Développement Effenco Inc. Fuel saving system that facilitates vehicle re-starts with the engine off
US9132824B2 (en) 2012-01-11 2015-09-15 Développement Effenco Inc. Fuel saving system that facilitates vehicle re-starts with the engine off
US10703356B2 (en) 2016-02-16 2020-07-07 Développement Effenco Inc. Expanded functionality stop-start fuel saving system for vocational vehicles

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