WO1995023957A1 - Procede et appareil pour mesurer la puissance ou le couple d'un vehicule - Google Patents

Procede et appareil pour mesurer la puissance ou le couple d'un vehicule Download PDF

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Publication number
WO1995023957A1
WO1995023957A1 PCT/DK1995/000099 DK9500099W WO9523957A1 WO 1995023957 A1 WO1995023957 A1 WO 1995023957A1 DK 9500099 W DK9500099 W DK 9500099W WO 9523957 A1 WO9523957 A1 WO 9523957A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
power
change
time
measure
Prior art date
Application number
PCT/DK1995/000099
Other languages
English (en)
Inventor
Jesper Ankersen
Original Assignee
Jesper Ankersen
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 Jesper Ankersen filed Critical Jesper Ankersen
Priority to AU17563/95A priority Critical patent/AU1756395A/en
Publication of WO1995023957A1 publication Critical patent/WO1995023957A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
    • G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity

Definitions

  • a method and an apparatus for measuring the power or torque of a vehicle are described.
  • the invention relates to an apparatus and a method for measuring e.g. the following performances in cars:
  • the apparatus and the method according to the invention replaces the traditional "Rolling Road” which takes a stationary installation in a building and a separate power installation.
  • a rolling road is very expensive and needs a skilled operator.
  • the car to be measured is fixed ⁇ ly mounted with its wheels resting on rollers with controlled brakes.
  • a fan is mounted in front of the car in order to provide sufficient air for cooling.
  • the rolling road measures the power of the engine (h.p. and Nm) and speedometer variations, but normally not top speed, acceleration and wind resistance and road friction.
  • a traditional rolling road does not form part of the ordinary equipment of a repair shop.
  • the invention enables most repair shops and other users to purchase the measuring equipment since the purchase and maintenance costs constitute only a fraction of similar costs of a rolling road.
  • the equipment may be adapted in conformity with the method according to the invention. Excluding the computer it may weigh less than 5 kg and may be accomodated in an ordinary attache case. With help from a detailed ma ⁇ nual operation of the equipment is simpel . Installation of the equipment takes only a few minutes. The measurement is made on a straight, level road length of approximately 1 km. A complete measurement will take three run-throughs. Disassembling of the equipment will take 3 to 5 mi ⁇ nutes and calculation and printing will typically last 10 minutes. The measuring accuracy of the equipment is ⁇ ⁇ 5%.
  • a velocity is measured with intervals of 1/10 sec.
  • the velocity is stored in the computer.
  • the difference between two velocities is converted into a power measure by means of the following formulae:
  • test driving is performed as follows: The car is accelerated from idle to top speed in the highest possible gear. Then you declutch and let the car roll until it has decelerated to the starting speed.
  • KW engine KW mes.acc + KW mes.dec
  • Kwkor Kw(1013/air pressure)*Sqr((273+air temperature)/293)
  • Nm is calculated according to the formula:
  • Fig. 1 shows a schematic measuring setup showing the electrical connec ⁇ tions to and from a measuring disc mounted on a wheel of a car
  • Fig. 2 shows the measuring disc of Fig. 1 in greater detail
  • Fig. 3 shows the measuring disc of Fig. 2 with a sensor unit mounted thereon
  • Fig. 4 shows the structure of a measuring unit consisting of the measu- ring disc and sensor unit shown in Fig. 3,
  • Fig. 5 shows the mounting of the measuring unit of Fig. 4 on a wheel of a car
  • Fig. 6 shows an alternative method of mounting the measuring unit of Fig. 4,
  • Fig. 7 shows the components of the signal converter shown in Fig. 1
  • Fig. 8 shows a graph of the electric circuit of the signal converter shown in Fig. 1, and
  • Figs. 9 to 18 show graphs and displays made by means of the apparatus according to the invention.
  • Fig. 1 of the drawing shows an emdodi ent of a system setup for use when excercising the measuring method according to the invention.
  • the reference numeral 8 is a wheel of a vehicle the power, accele ⁇ ration, speedometer, or wind resistance and road and gear friction of which is to be determined.
  • a measuring disc 10 with a sensor 12 is mounted in a manner to be described in greater detail be ⁇ low.
  • the sensor 12 is connected to a signal converter 14 which may be placed close to the measuring disc 10 or at a distance therefrom, for instance in the driver's cab of the vehicle.
  • the signal converter 14 is supplied by means of a cable connection 18 which may particularly and suitably at its end be provided with a jack 24 for con- nection to a cigar lighting device in the driver's cab of the vehicle.
  • a further cable connection 20 the signal converter 14 is connected to a computer unit, such as the portable computer unit 22 shown in the drawing.
  • the cable connection 20 is connected to the paral ⁇ lel printer gate of the computer unit 22 in any suitable manner.
  • the com ⁇ puter unit 22 records data which are processed for display. If a printer is connected to the computer unit 22 all graphs, tables, etc. may be printed out.
  • Fig. 2 shows in greater detail a measuring disc 10 for use in working the invention.
  • the measuring disc 10 is made of stainless steel plate and has a circle of punched-out rays around its centre.
  • punched-out slots 5 placed in a circle are formed.
  • Fig. 3 shows a sensor unit 12 mounted on the measuring disc 10.
  • the sen ⁇ sor unit 12 consists of an aluminum disc on which an optocoupler 13 is mounted.
  • the sensor unit 12 itself is mounted on the measuring disc 10 in such a manner that the disc may freely rotate with the wheel, the sensor unit itself being kept in place by means of a steel wire device 6 (vide Fig. 1).
  • Fig. 4 shows in greater detail the structure of a measuring unit con ⁇ sisting of the measuring disc shown in Figs. 1 to 3 and a sensor unit with an optocoupler.
  • the measuring unit consists of a reflector 26 placed on the side of the measuring disc opposite to the sensor unit, the said components be ⁇ ing assembled by means of a bolt 28 extending through the sensor unit 12, the measuring disc 10, and the reflector 26, the said components be ⁇ ing locked togther by means of a self-locking nut 30.
  • a felt washer 32 may be arranged between the sensor unit 12 and the measuring disc 10.
  • Fig. 5 shows in greater detail a method for placing or mounting the mea ⁇ suring disc at a wheel of a car.
  • a number of metal claws 34 gripping around the wheel bolts or the wheel nuts 36, respectively, may be used for the mounting.
  • the claws 34 are fixed to the wheel nuts 36 by means of a bolt 38 extending through a slot 5 in the measuring disc.
  • sleeves 40 may further be used in connection with 19 mm and 17 mm wheel bolts/wheel nuts 36.
  • Fig. 7 shows the structure of the signal converter 14 shown in Fig. 1.
  • the signal converter 14 contains a printed circuit board with electronic components.
  • the signal converter 14 comprises an amplifier 15, a puls coupler 16, four bit-counters 17 and four latchers 18.
  • the am ⁇ plifier 15 of the signal converter is connected to the sensor unit 12 at the wheel 8, and the signal converter 14 is also connected to a printer gate Lptl of a computer unit by means of a standard parallel printer cable 20.
  • the measuring disc with the sensor unit is mounted on a non-driving wheel of the vehicle by means of the claws shown in Figs. 5 or 6.
  • the sensor unit 12 is then connected to the sig ⁇ nal converter unit 14 which is connected to the cigar lighter of the ve ⁇ hicle.
  • the printer cable 20 is then connected to the Lptl gate of the computer unit 22. Thereafter the weight of the vehicle, the transmission of the gear and the differential gear, the circumference of the wheels 8, the air temperature and the barometric height are recorded, and a test driving may be initiated.
  • the test driving is preferably carried out by accelerating the vehicle from idle to top speed in the highest possible gear. Thereafter the vehicle is declutched and rolls until it has dece ⁇ lerated to the starting speed.
  • the optocoupler 13 of the sensor unit 12 transmits light through the rays 2 of the measuring disc 10.
  • the reflector 26 the light is reflected and re ⁇ ceived by the optocoupler.
  • the computer unit 22 the number of pulses from the rotating measuring disc 10 is recorded in units of time of 1/10 sec. The units of time are taken from the clock of the com ⁇ puter unit 22. As the wheel 8 turns the pulses from each ray which is passed are sent to the signal converter 14.
  • the signal conver ⁇ ter 14 amplifies the pulses, and then the frequence is doubled in order to increase the accuracy. Thereafter the frequence is converted into a 16 bit number via a number of interconnected counters. For each 1/10 sec. the computer generates a puls which causes the 16 bit number to be divided into 4x4 bits, whereafter the four values may be transmitted via four latchers to the computer unit 22 through the parallel printer gate Lptl.
  • the fact that the driving method used for determining the power perfor- mance consists of an acceleration followed by a deceleration is an es ⁇ sential characteristic of the invention.
  • the test may consist of one continuous drive or several combined drives, since separate tests may be made for acceleration and deceleration, respectively. It should be noted that the test may be made on any type of road, including roads which are level, or which climb or slope. Furthermore, the test driving may be made with all conceivable weights.
  • the acceleration it should further be noted that it may start at all conceivable starting velocities and up to all conceivable velocities since the fact that the acceleration is made in a fixed gear is a special characteristic of the invention.
  • the deceleration may be made either in a neutral gear or in gear, or in gear but declutched.
  • data may be recorded by means of laser technique from the roadway or from a stationary station to the vehicle, or, alternatively, by means of ultra sound technique from the roadway (doubler technique) or from a fixed base to the vehicle.
  • data may be recorded by means of an internal or external sensor from the wheels or the power or driving line of the car, or via the speedometer or speedograph of the car, via the ABS system or cardan sensors of the car, via the control electronics or the engine electronics of the car, via satellite navigation (GPS), or via radar, such as police equipment.
  • GPS satellite navigation
  • the storing of data may further take place via an accompanying PC, by means of the electronic U-pros of the vehicle, as a sound or another signal on a tape recorder, in the engine computer of the vehicle, via a data logger, or by means of a stationary or mobile station to which the data mentioned have been transmitted wirelessly.
  • the data processing may take place via a PC, a computer made for the purpose, manually transmitted data to a spreadsheet, mathematical per ⁇ ception, or by graphical perception.
  • a traditional rolling road measures the power of an engine in the fol- lowing way:
  • the car is fixedly mounted on the rolling road with the driving wheels on rollers.
  • the rollers may be contrailably braked so that the power of the car may be measured. Since the vehicle is stationary it is necessary to place a fan in front of the radiator of the vehicle in order to avoid superheating of the engine.
  • the evident advantage of this measuring me ⁇ thod is that it is possible to adjust the engine and test it at the same time.
  • the great disadvantage is that it is not possible to measure top speed, acceleration or braking ability due to lack of wind resistance and road friction.
  • the apparatus measures top speed, accelera ⁇ tion, engine power and torque as well as possible speedometer variations and road friction and wind resistance.
  • the measurements are carried out on road and therefore make allowance for - and measures - road friction and wind resistance.
  • the measuring method is quick. A complete test only takes 15 to 25 minutes, including mounting.
  • the test may e.g. provide the following results:
  • the skilled operator can measure the braking distance and for instance analyse the performance of the vehicle over a predetermined length of road.
  • a disc with measuring points is mounted on a wheel of the vehicle.
  • a sensor is mounted in the centre of the disc and connected through a light cable to a portable computer inside the car via a signal conver ⁇ ter.
  • This test gives you a graph showing the acceleration from the initial speed to maximum speed, in the chosen gear, as well as the deceleration to just below the initial speed.
  • This graph is processed by the computer which shows the result as two graphs, one showing h.p. (or kW), the o- ther Nm (torque). After processing the highest h.p. and Nm at the rele ⁇ vant rpm is shown on the main menue concerning the car make in question. The combined road and wind resistance at different speeds is shown as a separate graph.
  • test graph is shown as a graph in which the vertical axis (x) is speed and the horizontal axis (y) is the time.
  • the engine which supplies energy.
  • the result may be shown (and printed) as a table or a bar diagram.
  • the equipment (the hardware) consists of the following components: - A measuring disc fitted with a sensor unit, cable and plug for the "signal converter box”.
  • the program is installed onto the hard disc by means of the accompanying installation disk.
  • the programme creates a directory named DYNO ET" in which it places the actual programme and the help files.
  • the programme creates a directory named "DYNODAT" in which it stores the data from the tests.
  • This calibration enables the programme to use the clock of the computer for measuring time.
  • the computer has now created a file in the DYNOMET directory called: dy- nosys.ini, in which the "timer constant" is saved, so that no more cali ⁇ bration is needed, unless the programme is replaced, or you want to use a different computer from that used during calibration.
  • the claws fit 21 mm bolts/nuts.
  • a sleeve is fitted under the claw.
  • two sleeves are fitted under the claw.
  • Claws for 19 mm and/or 17 mm can be purchased as accessories.
  • the measuring disc is placed on the claws (it fits on wheels with 3, 4, or 5 bolts. If the wheel has 6 or 8 bolts very second bolt is u- sed). Mount the disc with the Allen screws. Tighten with a moment of 1.0 kg/m. Remember to place the washers beneath.
  • the wire must protrude at least 10 cm above the racket because of the vertical movements of the wheel.
  • the measuring starts.
  • elapsed time and speed will be shown on a speedometer on the screen.
  • the maximum time for a test is 400 seconds (6 in. 40 se ).
  • the invention provides a very accurate speedometer and you can press FI to F10 and the keys 1 to 6 to check the speedomenter. This is how it is done:
  • the maximum speed which can be measured is 160 kmph.
  • Type "g" to show the results in a bar diagram. Return to main menu by pressing "Esc.”
  • you have a pc with colour screen and a printer it may be an advan ⁇ tage to load a copy of the programme into it.
  • mice are advantageous. It may be used throughout the pro ⁇ gramme.
  • the data measured are now displayed in a table.
  • the table shows the time from start, the distance driven and the speed. You can scroll through the table by using the arrows.
  • the mouse is also active here. Place the cursor on top of the table. Press the mouse-button and the table scrolls backwards (the same ap ⁇ plies for downwards).
  • the acceleration graph is displayed on the screen by pressing "A”.
  • mice By means of the mouse you can adjust the x and the y axis. Place the mouse cursor on min. or max. and use the left or the right mouse-button for adjustment. If you do not have a mouse, you can also use the arrows, home, end, pgup, pgdn, h, k, n, m, as indicated on the screen.
  • the computer manipulates the graph and processes it.
  • the indicator on top of the screen shows how far it has come. This takes a few seconds.
  • the screen changes to show two graphs (h.p. and Nm).
  • the h.p. graph can be shown as kW by pressing "space", or by placing the mouse cursor on h.p. or kW in the upper left hand corner and pressing the mouse button.
  • the pro ⁇ gramme can also provide a graph showing the average of the two by press ⁇ ing "F5". Type a new file name for the file containing the average. Thereafter, the average graph is displayed.
  • This facility can be very useful to employ before and after having in- stalled accessories such as a spoiler to document its effect on the fuel economy or lack of such effect.
  • the specification needed is the circumference, in cm, of the wheel.
  • the easiest way to measure the circumference of the wheel is to place the car on a flat, hard surface, put a chalk mark on the asphalt and a corresponding chalk mark on the wheel. Then move the car until the wheel has made 10 revolutions. Mark the asphalt again. You can now measure the distance between the two marks and divide the result by 10. Type the re ⁇ sult and press "Enter”.
  • rear-axle assembly is meant. It might for instance be 3.36 (use . when entering).
  • *.nm is used for the processing of the data to h.p. and Nm graphs. *.ttt holds the description line.
  • the setting will be 2 (Automatic). Most computers will detect if the signal converter box is connected or not. If the signal converter is not connected, the programme will change to Demo mode.
  • This setting is used if the computer itself cannot detect whether the signal converter box is connected or not.
  • the programme will attempt to communicate with the signal converter, in failing connecting the programme will halt if the system is not as-muld.
  • the programme is transformed to a demonstration version. If you press
  • a filter also available under the colour menu may be used for instance for filtering away electronic interference.
  • the filter can be set at 10 different degrees (from 0% to 100%).
  • the filter often assist in smooth ⁇ ing a bad curve. However, sometimes it is better not to use it. Try it! Often it can spare you a new test.
  • the system has an integrated calculator, which you activate by pressing "g". You can operate it both by means of the keys and with the mouse. If for instance you use the calculator to calculate the gearing/differen- tial ratio, you can transfer the result by pressing "F10".
  • the sensor wheel may need disassembling, clean ⁇ ing, and lubricating.
  • the symptoms are difficulties in making a smooth measurement without interference.
  • the acceleration graph will be siery straight and very theoretical. There is also a risk (if the engine is turbo charged) that the turbo charger has not buildt up full pressure because the engine has not been fully loaded. This will result in a graph showing too little effect.
  • the engines in commercial vehicles are a lot more powerful than the en ⁇ gines of cars. Their engines are designed to work hard and because of the large volume the range of revs is very narrow, typically between 1100 and 1900 rpm.
  • the turbo charger does not normally work at revs, less than 1000 rpm, and many engines cut off the fuel supply at around 2000 rpm.
  • the driver often has an unsynchronized fullerton gear box, with 17-18 gears, at his disposal. He will soon find a suitable gear for a given load, speed and climb. Because of varying weight compared to the power of the engine, it may sometimes be difficult to decide the right gear and weight for a test.
  • a tractor unit is virtually impossible to measure without a trailer. However if the tractor is not fitted with automatic shut down of the pump at 90 kmph, a test may be possible in the highest or next highest gear. The best test is performed pulling an empty trailer.
  • the acceleration time for a lorry should be between 15 and 30 seconds and brings the vehicle to a relatively high speed.
  • This method is very suitable for vehicles of 500 h.p.
  • the programme will hereafter start up in the last chosen mode.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

Lors de la mesure de la puissance ou du couple d'un véhicule, on enregistre la vitesse de ce dernier lors de sa conduite sur route ou lors de son accélération dans une certaine disposition des vitesses, à des intervalles ou des unités d'accroissement de temps donnés. En fonction de ces vitesses enregistrées, on détermine le changement d'énergie cinétique pendant cet intervalle ou cette unité d'accroissement de temps. Ensuite, il est alors possible de déterminer le changement de puissance, lors de l'accélération, dans cet intervalle ou cette unité d'accroissement de temps. De manière correspondante, on enregistre la vitesse du véhicule lors de sa conduite sur route et de sa décélération dans la même disposition des vitesses que lors de son accélération, ou éventuellement lors de son débrayage, à certains intervalles de temps ou unités d'accroissement de temps. En fonction des vitesses enregistrées lors de la décélération, on détermine le changement d'énergie cinétique du véhicule lors de sa décélération, dans l'intervalle ou l'unité d'accroissement de temps donnée. Après quoi, il est possible de déterminer le changement de puissance pendant la décélération, dans cet intervalle ou cette unité d'accroissement de temps donnée. Lorsque l'on soustrait le changement de puissance lors de la décélération au changement de puissance lors de l'accélération, on obtient une mesure de la puissance du véhicule sans perte dans son système de transmission. En convertissant cette mesure de la puissance, on peut éventuellement obtenir la mesure du couple.
PCT/DK1995/000099 1994-03-02 1995-03-02 Procede et appareil pour mesurer la puissance ou le couple d'un vehicule WO1995023957A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17563/95A AU1756395A (en) 1994-03-02 1995-03-02 A method and an apparatus for measuring the power or torque of a vehicle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK24294 1994-03-02
DK242/94 1994-03-16

Publications (1)

Publication Number Publication Date
WO1995023957A1 true WO1995023957A1 (fr) 1995-09-08

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PCT/DK1995/000099 WO1995023957A1 (fr) 1994-03-02 1995-03-02 Procede et appareil pour mesurer la puissance ou le couple d'un vehicule

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WO (1) WO1995023957A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1102236C (zh) * 2000-08-08 2003-02-26 吴明 滑行标定检测汽车底盘传动系效率方法
DE102006001343A1 (de) * 2006-01-11 2007-07-12 Ankuro Int. Gmbh Verfahren zur berührungslosen Ermittlung der effektiven Leistung und/oder des Drehmoments und des Trägheitsmoments von rotierenden Maschinen und Mechanismen
GR20080100583A (el) * 2008-09-12 2010-04-21 Διονυσιος Χοϊδας Μεθοδος και συσκευη γιατην εν κινησει μετρησης ισχυος του κινητηρα ενος οχηματος
GR1008172B (el) * 2013-01-08 2014-04-14 Διονυσιος Θαλη Μυλωνας Μετρηση ιπποδυναμης και ροπης του αυτοκινητου στους τροχους με τη χρηση επιταχυνσιμετρου (g-meter)
GR1009319B (el) * 2017-05-16 2018-06-22 Διονυσιος Θαλη Μυλωνας Μετρηση ιπποδυναμης αυτοκινητου στο στροφαλοφορο αξονα

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693426A (en) * 1971-07-02 1972-09-26 Donald R Little Portable useful horsepower measuring instrument
US3942365A (en) * 1975-04-21 1976-03-09 Rca Corporation Power test means and method for internal combustion engines
US4041782A (en) * 1976-08-03 1977-08-16 Hingst Elmer J Hood-mountable digital speedometer
US4169371A (en) * 1977-08-08 1979-10-02 Walter Ruegg Method and apparatus for measuring drive system characteristic data in dynamic operation
EP0200660A1 (fr) * 1985-04-29 1986-11-05 Centre De Recherche En Machines Thermiques C.R.M.T. Procédé de mesure de la puisance disponible à bord d'un véhicule automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693426A (en) * 1971-07-02 1972-09-26 Donald R Little Portable useful horsepower measuring instrument
US3942365A (en) * 1975-04-21 1976-03-09 Rca Corporation Power test means and method for internal combustion engines
US4041782A (en) * 1976-08-03 1977-08-16 Hingst Elmer J Hood-mountable digital speedometer
US4169371A (en) * 1977-08-08 1979-10-02 Walter Ruegg Method and apparatus for measuring drive system characteristic data in dynamic operation
EP0200660A1 (fr) * 1985-04-29 1986-11-05 Centre De Recherche En Machines Thermiques C.R.M.T. Procédé de mesure de la puisance disponible à bord d'un véhicule automobile

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1102236C (zh) * 2000-08-08 2003-02-26 吴明 滑行标定检测汽车底盘传动系效率方法
DE102006001343A1 (de) * 2006-01-11 2007-07-12 Ankuro Int. Gmbh Verfahren zur berührungslosen Ermittlung der effektiven Leistung und/oder des Drehmoments und des Trägheitsmoments von rotierenden Maschinen und Mechanismen
GR20080100583A (el) * 2008-09-12 2010-04-21 Διονυσιος Χοϊδας Μεθοδος και συσκευη γιατην εν κινησει μετρησης ισχυος του κινητηρα ενος οχηματος
GR1008172B (el) * 2013-01-08 2014-04-14 Διονυσιος Θαλη Μυλωνας Μετρηση ιπποδυναμης και ροπης του αυτοκινητου στους τροχους με τη χρηση επιταχυνσιμετρου (g-meter)
GR1009319B (el) * 2017-05-16 2018-06-22 Διονυσιος Θαλη Μυλωνας Μετρηση ιπποδυναμης αυτοκινητου στο στροφαλοφορο αξονα
US10935461B2 (en) 2017-05-16 2021-03-02 Dionysios Mylonas Method for measuring automobile horsepower using an accelerometer

Also Published As

Publication number Publication date
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