Английская Википедия:Horsepower
Шаблон:Short description Шаблон:Other uses Шаблон:Infobox unit
Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 watts.
The term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. It was later expanded to include the output power of other types of piston engines, as well as turbines, electric motors and other machinery.[1][2] The definition of the unit varied among geographical regions. Most countries now use the SI unit watt for measurement of power. With the implementation of the EU Directive 80/181/EEC on 1 January 2010, the use of horsepower in the EU is permitted only as a supplementary unit.[3]
History
The development of the steam engine provided a reason to compare the output of horses with that of the engines that could replace them. In 1702, Thomas Savery wrote in The Miner's Friend:[4]
- So that an engine which will raise as much water as two horses, working together at one time in such a work, can do, and for which there must be constantly kept ten or twelve horses for doing the same. Then I say, such an engine may be made large enough to do the work required in employing eight, ten, fifteen, or twenty horses to be constantly maintained and kept for doing such a work...
The idea was later used by James Watt to help market his improved steam engine. He had previously agreed to take royalties of one-third of the savings in coal from the older Newcomen steam engines.[5] This royalty scheme did not work with customers who did not have existing steam engines but used horses instead.
Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute).[6] The wheel was Шаблон:Convert in radius; therefore, the horse travelled Шаблон:Nowrap feet in one minute. Watt judged that the horse could pull with a force of Шаблон:Convert.[7] So:
- <math qid=Q120634922> P = \frac{W}{t} = \frac{Fd}{t} = \frac{180~\text{lbf} \times 2.4 \times 2\,\pi \times 12~\text{ft}}{1~\text{min}} = 32{,}572~\frac{\text{ft} \cdot \text{lbf}}{\text{min}}.</math>
Engineering in History recounts that John Smeaton initially estimated that a horse could produce Шаблон:Convert per minute.[8] John Desaguliers had previously suggested Шаблон:Convert per minute, and Tredgold suggested Шаблон:Convert per minute. "Watt found by experiment in 1782 that a 'brewery horse' could produce Шаблон:Convert per minute."[9] James Watt and Matthew Boulton standardized that figure at Шаблон:Convert per minute the next year.[9]
A common legend states that the unit was created when one of Watt's first customers, a brewer, specifically demanded an engine that would match a horse, and chose the strongest horse he had and driving it to the limit. In that legend, Watt accepted the challenge and built a machine that was actually even stronger than the figure achieved by the brewer, and the output of that machine became the horsepower.[10]
In 1993, R. D. Stevenson and R. J. Wassersug published correspondence in Nature summarizing measurements and calculations of peak and sustained work rates of a horse.[11] Citing measurements made at the 1926 Iowa State Fair, they reported that the peak power over a few seconds has been measured to be as high as Шаблон:Convert[12] and also observed that for sustained activity, a work rate of about Шаблон:Convert per horse is consistent with agricultural advice from both the 19th and 20th centuries and also consistent with a work rate of about four times the basal rate expended by other vertebrates for sustained activity.[11]
When considering human-powered equipment, a healthy human can produce about Шаблон:Convert briefly (see orders of magnitude) and sustain about Шаблон:Convert indefinitely; trained athletes can manage up to about Шаблон:Convert briefly[13] and Шаблон:Convert for a period of several hours.[14] The Jamaican sprinter Usain Bolt produced a maximum of Шаблон:Convert 0.89 seconds into his 9.58 second Шаблон:Convert dash world record in 2009.[15]Шаблон:Failed verification
In 2023 a group of engineers modified a dynometer to be able to measure how much horsepower a horse can produce. This horse was measured to Шаблон:Convert.[16]
Calculating power
When torque Шаблон:Mvar is in pound-foot units, rotational speed Шаблон:Mvar is in rpm, the resulting power in horsepower is
- <math>\{P\}_\mathrm{hp} = \frac{\{T\}_\mathrm{ft {\cdot} lbf} \{N\}_\mathrm{rpm}}{5252}.</math>[17]
The constant 5252 is the rounded value of (33,000 ft⋅lbf/min)/(2π rad/rev).
When torque Шаблон:Mvar is in inch-pounds,
- <math>\{P\}_\mathrm{hp} = \frac{\{T\}_\mathrm{in {\cdot} lbf} \{N\}_\mathrm{rpm}}{63{,}025}.</math>
The constant 63,025 is the approximation of
- <math>33{,}000~\frac{\text{ft} {\cdot} \text{lbf}}{\text{min}} \times \frac{12~\frac{\text{in}}{\text{ft}}}{2\pi~\text{rad}} \approx 63{,}025 \frac{\text{in} {\cdot} \text{lbf}}{\text{min}}.</math>
Definitions
Mechanical horsepower
Assuming the third CGPM (1901, CR 70) definition of standard gravity, Шаблон:Nowrap, is used to define the pound-force as well as the kilogram force, and the international avoirdupois pound (1959), one mechanical horsepower is:
1 hp ≡ 33,000 ft·lbf/min by definition = 550 ft⋅lbf/s since 1 min = 60 s = 550 × 0.3048 × 0.45359237 m⋅kgf/s since 1 ft ≡ 0.3048 m and 1 lb ≡ 0.45359237 kg = 76.0402249 kgf⋅m/s = 76.0402249 × 9.80665 kg⋅m2/s3 since g = 9.80665 m/s2 ≈ 745.700 W since 1 W ≡ 1 J/s = 1 N⋅m/s = 1 (kg⋅m/s2)⋅(m/s)
Or given that 1 hp = 550 ft⋅lbf/s, 1 ft = 0.3048 m, 1 lbf ≈ 4.448 N, 1 J = 1 N⋅m, 1 W = 1 J/s: 1 hp ≈ 746 W
Шаблон:Anchor Metric horsepower (PS, cv, hk, pk, k, ks, ch)
The various units used to indicate this definition (PS, KM, cv, hk, pk, k, ks and ch) all translate to horse power in English. British manufacturers often intermix metric horsepower and mechanical horsepower depending on the origin of the engine in question.
DIN 66036 defines one metric horsepower as the power to raise a mass of 75 kilograms against the Earth's gravitational force over a distance of one metre in one second:[18] Шаблон:Nowrap = 75 [[Kilogram-force|Шаблон:Abbr]]⋅m/s = 1 PS. This is equivalent to 735.49875 W, or 98.6% of an imperial mechanical horsepower. In 1972, the PS was replaced by the kilowatt as the official power-measuring unit in EEC directives.[19]
Other names for the metric horsepower are the Italian Шаблон:Lang, Dutch Шаблон:Lang, the French Шаблон:Lang, the Spanish Шаблон:Lang and Portuguese Шаблон:Lang, the Russian Шаблон:Lang, the Swedish Шаблон:Lang, the Finnish Шаблон:Lang, the Estonian Шаблон:Lang, the Norwegian and Danish Шаблон:Lang, the Hungarian Шаблон:Lang, the Czech Шаблон:Lang and Slovak Шаблон:Lang or Шаблон:Lang), the Serbo-Croatian Шаблон:Lang, the Bulgarian Шаблон:Lang, the Macedonian Шаблон:Lang, the Polish Шаблон:Lang, Slovenian Шаблон:Lang, the Ukrainian Шаблон:Lang, the Romanian Шаблон:Lang, and the German Шаблон:Lang.
In the 19th century, the French had their own unit, which they used instead of the CV or horsepower. Based on a 100 kgf⋅m/s standard, it was called the poncelet and was abbreviated p.
Tax horsepower
Tax or fiscal horsepower is a non-linear rating of a motor vehicle for tax purposes.[20] Tax horsepower ratings were originally more or less directly related to the size of the engine; but as of 2000, many countries changed over to systems based on Шаблон:CO2 emissions, so are not directly comparable to older ratings.Шаблон:Citation needed The Citroën 2CV is named for its French fiscal horsepower rating, "deux chevaux" (2CV).Шаблон:Citation needed
Electrical horsepower
Nameplates on electrical motors show their power output, not the power input (the power delivered at the shaft, not the power consumed to drive the motor). This power output is ordinarily stated in watts or kilowatts. In the United States, the power output is stated in horsepower, which for this purpose is defined as exactly 746 W.[21]
Hydraulic horsepower
Hydraulic horsepower can represent the power available within hydraulic machinery, power through the down-hole nozzle of a drilling rig,[22] or can be used to estimate the mechanical power needed to generate a known hydraulic flow rate.
It may be calculated as[22]
- <math>\text{hydraulic power} = \frac{\text{pressure} \times \text{volumetric flow rate}}{1714},</math>
where pressure is in psi, and flow rate is in US gallons per minute.
Drilling rigs are powered mechanically by rotating the drill pipe from above. Hydraulic power is still needed though, as 1 500 to 5 000 W are required to push mud through the drill bit to clear waste rock. Additional hydraulic power may also be used to drive a down-hole mud motor to power directional drilling.[22]
When using SI units, the equation becomes coherent and there is no dividing constant.
- <math>\text{hydraulic power} = \text{pressure} \times \text{volumetric flow rate}</math>
where pressure is in pascals (Pa), and flow rate is in cubic metres per second (m3).
Boiler horsepower
Boiler horsepower is a boiler's capacity to deliver steam to a steam engine and is not the same unit of power as the 550 ft lb/s definition. One boiler horsepower is equal to the thermal energy rate required to evaporate Шаблон:Convert of fresh water at Шаблон:Convert in one hour. In the early days of steam use, the boiler horsepower was roughly comparable to the horsepower of engines fed by the boiler.[23]
The term "boiler horsepower" was originally developed at the Philadelphia Centennial Exhibition in 1876, where the best steam engines of that period were tested. The average steam consumption of those engines (per output horsepower) was determined to be the evaporation of Шаблон:Convert of water per hour, based on feed water at Шаблон:Convert, and saturated steam generated at Шаблон:Cvt. This original definition is equivalent to a boiler heat output of Шаблон:Cvt. A few years later in 1884, the ASME re-defined the boiler horsepower as the thermal output equal to the evaporation of 34.5 pounds per hour of water "from and at" Шаблон:Convert. This considerably simplified boiler testing, and provided more accurate comparisons of the boilers at that time. This revised definition is equivalent to a boiler heat output of Шаблон:Cvt. Present industrial practice is to define "boiler horsepower" as a boiler thermal output equal to Шаблон:Cvt, which is very close to the original and revised definitions.
Boiler horsepower is still used to measure boiler output in industrial boiler engineering in the US. Boiler horsepower is abbreviated BHP, not to be confused with brake horsepower, below, which is also abbreviated bhp, in lower case.
Drawbar power
Drawbar power (dbp) is the power a railway locomotive has available to haul a train or an agricultural tractor to pull an implement. This is a measured figure rather than a calculated one. A special railway car called a dynamometer car coupled behind the locomotive keeps a continuous record of the drawbar pull exerted, and the speed. From these, the power generated can be calculated. To determine the maximum power available, a controllable load is required; it is normally a second locomotive with its brakes applied, in addition to a static load.
If the drawbar force (Шаблон:Mvar) is measured in pounds-force (lbf) and speed (Шаблон:Mvar) is measured in miles per hour (mph), then the drawbar power (Шаблон:Mvar) in horsepower (hp) is
<math display=block>\{P\}_\mathrm{hp} = \frac{\{F\}_\mathrm{lbf} \{v\}_\mathrm{mph}}{375}.</math>
Example: How much power is needed to pull a drawbar load of 2,025 pounds-force at 5 miles per hour?
<math display=block>\{P\}_\mathrm{hp} = \frac{2025 \times 5}{375} = 27.</math>
The constant 375 is because 1 hp = 375 lbf⋅mph. If other units are used, the constant is different. When using coherent SI units (watts, newtons, and metres per second), no constant is needed, and the formula becomes Шаблон:Math.
This formula may also be used to calculate the power of a jet engine, using the speed of the jet and the thrust required to maintain that speed.
Example: how much power is generated with a thrust of 4000 pounds at 400 miles per hour?
<math display=block>\{P\}_\mathrm{hp} = \frac{4000 \times 400}{375} = 4266.7.</math>
RAC horsepower (taxable horsepower)
This measure was instituted by the Royal Automobile Club and was used to denote the power of early 20th-century British cars. Many cars took their names from this figure (hence the Austin Seven and Riley Nine), while others had names such as "40/50 hp", which indicated the RAC figure followed by the true measured power.
Taxable horsepower does not reflect developed horsepower; rather, it is a calculated figure based on the engine's bore size, number of cylinders, and a (now archaic) presumption of engine efficiency. As new engines were designed with ever-increasing efficiency, it was no longer a useful measure, but was kept in use by UK regulations, which used the rating for tax purposes. The United Kingdom was not the only country that used the RAC rating; many states in Australia used RAC hp to determine taxation.[24][25] The RAC formula was sometimes applied in British colonies as well, such as Kenya (British East Africa).[26]
- <math>\text{RAC h.p.} = \frac{D \times D \times n}{2.5}</math>
where
Since taxable horsepower was computed based on bore and number of cylinders, not based on actual displacement, it gave rise to engines with "undersquare" dimensions (bore smaller than stroke), which tended to impose an artificially low limit on rotational speed, hampering the potential power output and efficiency of the engine.
The situation persisted for several generations of four- and six-cylinder British engines: For example, Jaguar's 3.4-litre XK engine of the 1950s had six cylinders with a bore of Шаблон:Convert and a stroke of Шаблон:Convert,[28] where most American automakers had long since moved to oversquare (large bore, short stroke) V8 engines. See, for example, the early Chrysler Hemi engine.
Measurement
The power of an engine may be measured or estimated at several points in the transmission of the power from its generation to its application. A number of names are used for the power developed at various stages in this process, but none is a clear indicator of either the measurement system or definition used.
In general:
- nominal horsepower is derived from the size of the engine and the piston speed and is only accurate at a steam pressure of Шаблон:Convert;[29]
- indicated or gross horsepower is the theoretical capability of the engine [PLAN/ 33000];
- brake/net/crankshaft horsepower (power delivered directly to and measured at the engine's crankshaft) equals
- indicated horsepower minus frictional losses within the engine (bearing drag, rod and crankshaft windage losses, oil film drag, etc.);
- shaft horsepower (power delivered to and measured at the output shaft of the transmission, when present in the system) equals
- crankshaft horsepower minus frictional losses in the transmission (bearings, gears, oil drag, windage, etc.);
- effective, true (thp) or commonly referred to as wheel horsepower (whp) equals
- shaft horsepower minus frictional losses in the universal joint/s, differential, wheel bearings, tire and chain, (if present).
All the above assumes that no power inflation factors have been applied to any of the readings.
Engine designers use expressions other than horsepower to denote objective targets or performance, such as brake mean effective pressure (BMEP). This is a coefficient of theoretical brake horsepower and cylinder pressures during combustion.
Шаблон:AnchorШаблон:Anchor Nominal horsepower
Nominal horsepower (nhp) is an early 19th-century rule of thumb used to estimate the power of steam engines.[29] It assumed a steam pressure of Шаблон:Convert.[30]
Nominal horsepower = 7 × area of piston in square inches × equivalent piston speed in feet per minute/33,000.
For paddle ships, the Admiralty rule was that the piston speed in feet per minute was taken as 129.7 × (stroke)1/3.38.[29][30] For screw steamers, the intended piston speed was used.[30]
The stroke (or length of stroke) was the distance moved by the piston measured in feet.
For the nominal horsepower to equal the actual power it would be necessary for the mean steam pressure in the cylinder during the stroke to be Шаблон:Convert and for the piston speed to be that generated by the assumed relationship for paddle ships.[29]
The French Navy used the same definition of nominal horse power as the Royal Navy.[29]
| Comparison of nominal and indicated horse power | ||||
|---|---|---|---|---|
| Ship | Indicated horse power (ihp) | Nominal horse power (nhp) | Ratio of ihp to nhp | Source |
| Dee | 272 | 200 | 1.36 | [29] |
| Locust | 157 | 100 | 1.57 | [29] |
| Rhadamanthus | 400 | 220 | 1.82 | [29] |
| Albacore | 109 | 60 | 1.82 | [30] |
| Porcupine | 285 | 132 | 2.16 | [29] |
| Harpy | 520 | 200 | 2.60 | [29] |
| Spitfire | 380 | 140 | 2.70 | [29] |
| Spiteful | 796 | 280 | 2.85 | [30] |
| Jackal | 455 | 150 | 3.03 | [29] |
| Supply | 265 | 80 | 3.31 | [30] |
| Simoom | 1,576 | 400 | 3.94 | [30] |
| Hector | 3,256 | 800 | 4.07 | [30] |
| Agincourt | 6,867 | 1,350 | 5.08 | [30] |
| Bellerophon | 6,521 | 1,000 | 6.52 | [30] |
| Monarch | 7,842 | 1,100 | 7.13 | [30] |
| Penelope | 4,703 | 600 | 7.84 | [30] |
Шаблон:Anchor Indicated horsepower
Indicated horsepower (ihp) is the theoretical power of a reciprocating engine if it is completely frictionless in converting the expanding gas energy (piston pressure × displacement) in the cylinders. It is calculated from the pressures developed in the cylinders, measured by a device called an engine indicator – hence indicated horsepower. As the piston advances throughout its stroke, the pressure against the piston generally decreases, and the indicator device usually generates a graph of pressure vs stroke within the working cylinder. From this graph the amount of work performed during the piston stroke may be calculated.
Indicated horsepower was a better measure of engine power than nominal horsepower (nhp) because it took account of steam pressure. But unlike later measures such as shaft horsepower (shp) and brake horsepower (bhp), it did not take into account power losses due to the machinery internal frictional losses, such as a piston sliding within the cylinder, plus bearing friction, transmission and gear box friction, etc.
Шаблон:Anchor Brake horsepower
Brake horsepower (bhp) is the power measured using a brake type (load) dynamometer at a specified location, such as the crankshaft, output shaft of the transmission, rear axle or rear wheels.[31]
In Europe, the DIN 70020 standard tests the engine fitted with all ancillaries and the exhaust system as used in the car. The older American standard (SAE gross horsepower, referred to as bhp) used an engine without alternator, water pump, and other auxiliary components such as power steering pump, muffled exhaust system, etc., so the figures were higher than the European figures for the same engine. The newer American standard (referred to as SAE net horsepower) tests an engine with all the auxiliary components (see "Engine power test standards" below).Шаблон:Citation needed
Brake refers to the device which is used to provide an equal braking force, load to balance, or equal an engine's output force and hold it at a desired rotational speed. During testing, the output torque and rotational speed are measured to determine the brake horsepower. Horsepower was originally measured and calculated by use of the "indicator diagram" (a James Watt invention of the late 18th century), and later by means of a Prony brake connected to the engine's output shaft. Modern dynamometers use any of several braking methods to measure the engine's brake horsepower, the actual output of the engine itself, before losses to the drivetrain.Шаблон:Citation needed
Shaft horsepower
Shaft horsepower (shp) is the power delivered to a propeller shaft, a turbine shaft, or to an output shaft of an automotive transmission.[32] Shaft horsepower is a common rating for turboshaft and turboprop engines, industrial turbines, and some marine applications.
Equivalent shaft horsepower (eshp) is sometimes used to rate turboprop engines. It includes the equivalent power derived from residual jet thrust from the turbine exhaust.[33] Шаблон:Convert of residual jet thrust is estimated to be produced from one unit of horsepower.[34]
Шаблон:Anchor Engine power test standards
There exist a number of different standards determining how the power and torque of an automobile engine is measured and corrected. Correction factors are used to adjust power and torque measurements to standard atmospheric conditions, to provide a more accurate comparison between engines as they are affected by the pressure, humidity, and temperature of ambient air.[35] Some standards are described below.
Шаблон:Anchor Society of Automotive Engineers/SAE International
Early "SAE horsepower" (see RAC horsepower for the formula)
In the early twentieth century, a so-called "SAE horsepower" was sometimes quoted for U.S. automobiles. This long predates the Society of Automotive Engineers (SAE) horsepower measurement standards and was another name for the industry standard ALAM or NACC horsepower figure and the same as the British RAC horsepower also used for tax purposes. Alliance for Automotive Innovation is the current successor of ALAM and NACC.
Шаблон:Anchor SAE gross power
Prior to the 1972 model year, American automakers rated and advertised their engines in brake horsepower, bhp, which was a version of brake horsepower called SAE gross horsepower because it was measured according to Society of Automotive Engineers (SAE) standards (J245 and J1995) that call for a stock test engine without accessories (such as dynamo/alternator, radiator fan, water pump),[36] and sometimes fitted with long tube test headers in lieu of the OEM exhaust manifolds. This contrasts with both SAE net power and DIN 70020 standards, which account for engine accessories (but not transmission losses). The atmospheric correction standards for barometric pressure, humidity and temperature for SAE gross power testing were relatively idealistic.
Шаблон:Anchor SAE net power
In the United States, the term bhp fell into disuse in 1971–1972, as automakers began to quote power in terms of SAE net horsepower in accord with SAE standard J1349. Like SAE gross and other brake horsepower protocols, SAE net hp is measured at the engine's crankshaft, and so does not account for transmission losses. However, similar to the DIN 70020 standard, SAE net power testing protocol calls for standard production-type belt-driven accessories, air cleaner, emission controls, exhaust system, and other power-consuming accessories. This produces ratings in closer alignment with the power produced by the engine as it is actually configured and sold.
SAE certified power
In 2005, the SAE introduced "SAE Certified Power" with SAE J2723.[37] To attain certification the test must follow the SAE standard in question, take place in an ISO 9000/9002 certified facility and be witnessed by an SAE approved third party.
A few manufacturers such as Honda and Toyota switched to the new ratings immediately.[38] The rating for Toyota's Camry 3.0 L 1MZ-FE V6 fell from Шаблон:Convert.[38] The company's Lexus ES 330 and Camry SE V6 (3.3 L V6) were previously rated at Шаблон:Convert but the ES 330 dropped to Шаблон:Convert while the Camry declined to Шаблон:Convert. The first engine certified under the new program was the 7.0 L LS7 used in the 2006 Chevrolet Corvette Z06. Certified power rose slightly from Шаблон:Convert.
While Toyota and Honda are retesting their entire vehicle lineups, other automakers generally are retesting only those with updated powertrains.[38] For example, the 2006 Ford Five Hundred is rated at Шаблон:Convert, the same as that of 2005 model. However, the 2006 rating does not reflect the new SAE testing procedure, as Ford is not going to incur the extra expense of retesting its existing engines.[38] Over time, most automakers are expected to comply with the new guidelines.
SAE tightened its horsepower rules to eliminate the opportunity for engine manufacturers to manipulate factors affecting performance such as how much oil was in the crankcase, engine control system calibration, and whether an engine was tested with high octane fuel. In some cases, such can add up to a change in horsepower ratings.
Шаблон:AnchorDeutsches Institut für Normung 70020 (DIN 70020)
DIN 70020 is a German DIN standard for measuring road vehicle horsepower. DIN hp is measured at the engine's output shaft as a form of metric horsepower rather than mechanical horsepower. Similar to SAE net power rating, and unlike SAE gross power, DIN testing measures the engine as installed in the vehicle, with cooling system, charging system and stock exhaust system all connected. DIN hp is often abbreviated as "PS", derived from the German word Pferdestärke (literally, "horsepower").
CUNA
A test standard by Italian CUNA (Commissione Tecnica per l'Unificazione nell'Automobile, Technical Commission for Automobile Unification), a federated entity of standards organisation UNI, was formerly used in Italy. CUNA prescribed that the engine be tested with all accessories necessary to its running fitted (such as the water pump), while all others – such as alternator/dynamo, radiator fan, and exhaust manifold – could be omitted.[36] All calibration and accessories had to be as on production engines.[36]
Шаблон:AnchorEconomic Commission for Europe R24
ECE R24 is a UN standard for the approval of compression ignition engine emissions, installation and measurement of engine power.[39] It is similar to DIN 70020 standard, but with different requirements for connecting an engine's fan during testing causing it to absorb less power from the engine.[40]
Шаблон:AnchorEconomic Commission for Europe R85
ECE R85 is a UN standard for the approval of internal combustion engines with regard to the measurement of the net power.[41]
80/1269/EEC
80/1269/EEC of 16 December 1980 is a European Union standard for road vehicle engine power.
Шаблон:AnchorInternational Organization for Standardization
The International Organization for Standardization (ISO) publishes several standards for measuring engine horsepower.
- ISO 14396 specifies the additional and method requirement for determining the power of reciprocating internal combustion engines when presented for an ISO 8178 exhaust emission test. It applies to reciprocating internal combustion engines for land, rail and marine use excluding engines of motor vehicles primarily designed for road use.[42]
- ISO 1585 is an engine net power test code intended for road vehicles.[43]
- ISO 2534 is an engine gross power test code intended for road vehicles.[44]
- ISO 4164 is an engine net power test code intended for mopeds.[45]
- ISO 4106 is an engine net power test code intended for motorcycles.[46]
- ISO 9249 is an engine net power test code intended for earth moving machines.[47]
Шаблон:AnchorJapanese Industrial Standard D 1001
JIS D 1001 is a Japanese net, and gross, engine power test code for automobiles or trucks having a spark ignition, diesel engine, or fuel injection engine.[48]
See also
- Brake-specific fuel consumption – how much fuel an engine consumes per unit energy output
- Dynamometer engine testing
- European units of measurement directives
- Horsepower-hour
- Mean effective pressure
- Torque
References
External links
Шаблон:Imperial units Шаблон:United States Customary Units
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- ↑ Terrell Croft, Wilford Summers, American Electrician's Handbook Eleventh Edition, McGraw Hill, 1987,ISBN 0-07-013932-6, page 7-175
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- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
