Automotive X Prize

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Progressive Insurance Automotive X PRIZE
Automotive X PRIZE logo.png
Awarded for"design, build and race super-efficient vehicles that will achieve 100 MPGe (2.35 liter/100 kilometer) efficiency, produce less than 200 grams/mile well-to-wheel CO2 equivalent emissions, and could be manufactured for the mass market" [1]
CountryWorldwide
Presented by X PRIZE Foundation
Reward(s)US$10 million (divided) [1]
First awarded2010
Currently held byTeam Edison2, Team Li-Ion Motors, Team X-Tracer
Website xprize.org/prizes/auto

The Progressive Insurance Automotive X Prize (PIAXP or AXP) was a set of competitions, programs and events, from the X Prize Foundation, to "inspire a new generation of super-efficient vehicles that help break America's addiction to oil and stem the effects of climate change." [2] Progressive Insurance was the title sponsor of the prize, the centerpiece of which is the Competition Division, within which a 10-million-dollar purse was divided between the winners of three competitions.

Contents

The essence of each competition was to design, build and race super-efficient vehicles that achieved 100 MPGe (2.35 liter/100 kilometer) efficiency, produced less than 200 grams/mile well-to-wheel CO2 equivalent emissions, and could be manufactured for the mass market. [1] Within the Competition Division, there are two vehicle classes: Mainstream and Alternative. The mainstream class had a prize of $5 million. The alternate class had two separate prizes of $2.5 million, one for side-by-side seating and one for tandem seating. [3]

The PIAXP has an educational program, funded by a $3.5 million grant from the United States Department of Energy, to engage students and the public in learning about advanced vehicle technologies, energy efficiency, climate change, alternative fuels, and the science, technology, engineering, and math behind efficient vehicle development. [4]

History

The X Prize Foundation began work on the development of a competition to spur innovation in the automotive industry in 2005 and on 6 March 2006 announced that Mark Goodstein would join the Foundation as an executive director of the new prize. [5] A little more than year later, on 12 April 2007, the Foundation formally announced the creation of the prize at the 2007 New York Auto Show and set the purse at $10 million for a car that could get 100 mpgUS (2.4 L/100 km; 120 mpgimp) and be sold for a reasonable price. [6] In the subsequent year, the X Prize Foundation solidified sponsorship for the prize and on 20 March 2008 announced that Progressive Insurance would be the Title Sponsor of the Prize and fund the $10 million purse. From that point onward, it was known as the Progressive Insurance Automotive X Prize (PIAXP). [7]

At the 12 April 2007 announcement of the creation of the X Prize, the Foundation released draft Competition Guidelines, which were open for public comment from 2 April to 31 May 2007. The latest guidelines were published on 10 January 2009. The competition guidelines are the product of hundreds of volunteers of the AXP and world-class advisors. [3]

On 7 April 2009, the X Prize Foundation announced that 111 teams had registered by the February 2009 deadline. [8] By 20 October 2009, the design judging had winnowed the number of teams down to 43, with some publicly, and others quietly, withdrawing. [9] The formal vehicle competition events began on 26 April 2010, and consisted of the remaining four stages: Shakedown (26 April – 7 May 2010), Knockout ( 16–30 June 2010), Finals ( 19–30 July 2010) and Validation (August 2010). [10]

Winners

The winners of the competition were announced on 16 September 2010. [11]

Vehicle requirements

Within the competition division, there are two vehicle classes—mainstream and alternative—both of which have the same requirements for fuel economy and emissions, but differing design constraints. The Alternative class is further divided into tandem and side-by-side classes. Vehicles in the Mainstream Class must meet specifications that are derived from typical small, five-passenger, economy mixed-use vehicles. The Alternative Class has fewer performance and design restrictions and provides an outlet for innovation. Both classes allow entries that are modifications of an existing popular vehicle, provided that all PIAXP requirements are met.

Vehicles in both classes must have a fuel economy of 100 MPGe (21 kWh or 2.35 liters of petrol/100 kilometer) and produce less than 200 grams/mile CO2 emissions (measured well-to-wheel). For electric vehicles, the CO2 emissions requirement is a more binding constraint. Because CO2 emissions will be calculated assuming a national average of electricity sources projected to 2014, an all-electric car will have to achieve 114 MPGe in order to produce less than 200 grams/mile CO2 emissions. Further, electricity consumption is measured at the "plug" side of the battery charging device, so it would have to achieve 114 MPGe, assuming 100% efficient battery charging. If the charger were 85% efficient, this requirement would grow to 134 MPGe. [12] [13] In the other words, efficiency of electric cars should be not 21 but 16 kWh/100 km.

Vehicles in both classes also must have features expected of a modern automobile including an enclosed cabin with windshield and windows, operating windshield wipers, washers, headlights, horn, indicators, brake lights, reflective devices, rear and side-view mirrors, and seat belts. They must have the usual automotive controls, including accelerator pedal, brake pedal, steering mechanism (not necessarily a wheel) and indicators. They must be "highway capable", which is defined as the ability to maintain 65 mph (105 km/h) on a four percent uphill grade and to accelerate from 40 mph (64 km/h) to 60 mph (97 km/h) in less than 9 seconds. They must be able to brake from 60 to 0 mph in less than 170 feet (52 m), meet existing noise standards and use tires that meet automotive or motorcycle (alternative class only and only if the vehicle is otherwise eligible to be classified as a motorcycle) standards. Both must meet the same set of static and dynamic stability requirements.

The mainstream vehicle must seat at least four adults with at least two side-by-side front seats, have at least 10 cubic feet (0.28 m3) of useful cargo space in one contiguous location not counting the passenger seats, accelerate from 0 to 60 mph (97 km/h) in 15 seconds or less, and be able to drive 200 miles (320 km) without refueling or recharging. The mainstream vehicle must have four or more wheels.

The alternate class vehicle must seat at least two people, accelerate from 0 to 60 mph (97 km/h) in 18 seconds or less, and be able to drive 100 miles (160 km) without refueling or recharging. The alternative vehicle has no minimum number of wheels, but it must remain upright when stopped with no driver inputs. [14]

While the main focus of PIAXP is fuel economy and carbon emissions, not safety, the vehicles must be "production capable". Therefore, the entries must either be fully compliant with the Federal Motor Vehicle Safety Standards (FMVSS) and other applicable National Highway Traffic Safety Administration (NHTSA) requirements or compliance has to be "designed in". For example, allowance for airbags in the designs is considered acceptable without actually installing the airbags. [15] Teams are also required to submit a business plan which clearly demonstrates an ability to produce 10,000 vehicles per year. Note that teams are not required to be under-taking this plan, but the plan has to exist and the car has to be designed such that this plan is feasible.

With the lack of mainstream entrants from established automobile companies, a Demonstration Division was created so that automakers could at least display and promote their highest efficiency vehicles alongside the main competition. However, there were too few entrants by 1 March registration deadline, and this division was canceled. [16] The only confirmed entrant was the Tesla Roadster, which had dropped out of the main competition.

Vehicles in the demonstration division would have met the same requirements as mainstream class vehicles in the competition division, except for MPGe and CO2 emissions. There was no alternative class equivalent in the demonstration division. These vehicles would have been stock vehicles, i.e., vehicles identical to those for sale or pre-production prototypes of vehicles intended for sales.

Vehicles in the demonstration division would have been tested in the same way as competition division vehicles and would have participated in the PIAXP competition events under the same rules in order to demonstrate and showcase their capabilities and performance. [17]

Competition events

The competition timeline was finalized as follows: [18]

Design judging

Accepted teams must provide evidence that their vehicles are production capable, by providing a detailed Data Submissions covering four areas:

Those that pass this hurdle will be invited to bring their vehicles to the competition events. The design judging was closed in October 2009, with 43 teams remaining.

Shakedown stages

The first three stages are intended to be a "shake-down" period and performance in these stages do not count to final scores. The first step of the competition is the review of technical reports, technical inspection of the vehicles and performance testing of safety elements to eliminate unsafe vehicles. The two-week shakedown took place at the Michigan International Speedway, from 26 April to 7 May 2010.

Those that pass the initial technical and safety inspections and tests will participate in the remaining competition events. These include stage races, additional active safety performance tests and a dynamometer test.

Knockout stage

The next stage is a "knockout" qualifying event. To advance, vehicles must pass active safety performance tests, meet acceptable emission levels and demonstrate at least 67 MPGe on a test track. These were held at the Michigan International Speedway from 20 to 29 June 2010. After this stage, only 15 vehicles from 12 teams remained in the competition.

Finals stage

The final stage determines the winning teams. To complete the race successfully, vehicles must maintain a minimum average speed (maximum allowable time) while meeting PIAXP requirements for fuel economy (90 MPGe) and emissions. The finals also include a tie breaking race; the vehicle with the best overall time while still meeting requirements will take the purse. [19] The final stages are scheduled for 19–30 July 2010 at the Michigan International Speedway.

Validation stage

The few remaining teams were validated on dynamometers under laboratory conditions at the EPA Labs in Ann Arbor, Michigan and Argonne National Laboratory in Chicago, Illinois. This stage is scheduled for August 2010. The validation results count toward 50% of the final efficiency figures, which together must exceed 100 MPGe.

Edison2 was an exception. The engines in both Very Light Cars failed before validation. [20] Edison2 was allowed to circumvent the rules governing procedures and provided independent third-party validation reports instead of undergoing the same validation testing as other finalist teams. [21]

Educational program

The United States Department of Energy joined the PIAXP as a sponsor, funding an educational program targeted to young people. The first component of the Education Program is a web site created in partnership with Discovery Education, www.FuelOurFutureNow.com, featuring activities for K-12 students, as well as videos, virtual labs, and interactive resources intended for use in school and in the home.

Competing teams

Although 111 teams registered for the PAIXP and paid the registration fee, [22] by 20 October 2009, the number of teams had decreased to 43, sponsoring 53 vehicles between them. [9] These remaining teams represented 10 countries (some entries listed two countries of origin) with 28 coming from the United States and 7 from the state of California. Of the 53 vehicles, 28 were in the Alternative Classes and 25 in the Mainstream Class. By 15 April, only 30 teams remained. After the shakedown completed in May, 22 teams remained. [23] A sample of the teams is shown below.

Mainstream

Alternative (Side by Side)

Aptera Motors' high-efficiency passenger vehicle was a contender in the X-Prize competition. Aptera Typ-1 Wallpaper.jpg
Aptera Motors' high-efficiency passenger vehicle was a contender in the X-Prize competition.

Alternative (Tandem)

See also

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References

  1. 1 2 3 Alan Boyle. "Auto X Prize Revs Up". MSNBC. Archived from the original on 8 August 2008. Retrieved 16 September 2008.
  2. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. p. 5. Archived from the original (PDF) on 1 August 2009. Retrieved 21 June 2009.
  3. 1 2 "Competition Guidelines" (PDF). progressiveautoxprize.org. Archived from the original (PDF) on 1 August 2009. Retrieved 28 May 2009.
  4. "Education Program Overview". X Prize Foundation. Archived from the original on 14 June 2009. Retrieved 30 June 2009.
  5. "Press Release: X Prize Foundation Hires Mark Goodstein as Executive Director". X Prize Foundation . Retrieved 30 June 2009.
  6. Eric Evarts. "Auto X Prize to reward 100-mpg car". Consumer Reports. Archived from the original on 5 March 2009. Retrieved 30 June 2009.
  7. "Press Release: X Prize Foundation Progressive Insurance Join Forces to Officially Announce the $10 Million Automotive X Prize". X Prize Foundation . Retrieved 30 September 2009.
  8. "111 Teams Get Green Light to Advance in Multimillion Dollar Competition". X Prize Foundation . Retrieved 27 June 2010.
  9. 1 2 "Teams | Progressive Automotive XPRIZE". Progressiveautoxprize.org. Archived from the original on 28 December 2010. Retrieved 10 January 2011.
  10. "COMPETITION TIMELINE". X Prize Foundation. Archived from the original on 28 December 2010. Retrieved 10 January 2011.
  11. "Three Teams Awarded Share of $10 Million Purse in Progressive Insurance Automotive X PRIZE for Super Fuel-Efficient Vehicles". X Prize Foundation. Archived from the original on 19 September 2010. Retrieved 17 September 2010.
  12. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. pp. 27, 29. Archived (PDF) from the original on 1 August 2009. Retrieved 21 June 2009.
  13. "Energy and Emissions Spreadsheet 12.1.08". X Prize Foundation . Retrieved 4 July 2009.
  14. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. pp. 16, 20. Archived (PDF) from the original on 1 August 2009. Retrieved 21 June 2009.
  15. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. pp. 20, 21. Archived (PDF) from the original on 1 August 2009. Retrieved 21 June 2009.
  16. "X Prize Team Registration page". X Prize Foundation. 1 March 2010. Retrieved 6 May 2010.
  17. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. pp. 39, 40. Archived (PDF) from the original on 1 August 2009. Retrieved 21 June 2009.
  18. "Competition Timeline". X Prize Foundation. Archived from the original on 4 May 2010. Retrieved 6 May 2010.
  19. "Competition Guidelines, Version 1.2, 13 January 2009" (PDF). X Prize Foundation. pp. 10–12. Archived (PDF) from the original on 1 August 2009. Retrieved 21 June 2009.
  20. Eric Cahill. "The Competition Isn't Over Yet: Why Validation Matters". Progressive Automotive XPrize Blog. Retrieved 31 March 2011.
  21. John O'Dell. "Auto X-Prize's 'Mainstream' Finalist Gets OK to Provide Own Validation Results". Edmunds.com Green Car Advisor. Archived from the original on 20 August 2010. Retrieved 31 March 2011.
  22. "Registered Teams Overview" (PDF). X Prize Foundation . Retrieved 10 July 2009.
  23. Evarts, Eric. "Automotive X Prize: Final Shakedown results". Consumer Reports Cars Blog. Archived from the original on 17 May 2010. Retrieved 17 May 2010.
  24. Zahid Sardar (19 April 2008). "Aptera's 3-wheeler looks as if it could soar". San Francisco Chronicle. Retrieved 2 August 2008.
  25. Eric Hagerman (20 December 2007). "1 Gallon of Gas, 100 Miles – $10 Million: The Race to Build the Supergreen Car". Wired Magazine . Archived from the original on 9 May 2008. Retrieved 1 April 2008.
  26. "7 sexy hybrids you can't (yet) buy". NBC News . 18 September 2008. Retrieved 22 September 2008.
  27. O'Dell, John (2 December 2010). "Carbon Zero EV Making Return to Detroit Auto Show After Missing Auto X-Prize". Edmunds.com. Archived from the original on 7 July 2012. Retrieved 7 January 2011.
  28. Budman, Scott (20 November 2010). "Sexy, Fast, Green, and Waaay Less Than A Tesla". NBC Universal, Inc.
  29. Garthwaite, Josie (13 April 2010). "Saba Motors: What Dell Can Teach Us About Building Electric Cars". GigaOm. Retrieved 7 January 2011.
  30. Krishna Ramanujan. "CU to show off its 100-mpg car-in-progress at state fair". PhysOrg.com. Archived from the original on 13 September 2008. Retrieved 26 September 2008.
  31. Carol Tice (27 October 2007). "Notable in the Northwest". The Seattle Times. Retrieved 16 September 2008.
  32. "Welcome | Progressive Automotive XPRIZE". Progressiveautoxprize.org. Archived from the original on 20 September 2010. Retrieved 18 September 2010.
  33. "Jonway to Manufacture ZAP's Alias Electric Sports Vehicle in China". Automobile Driving. 30 April 2010. Retrieved 18 September 2010.[ dead link ]
  34. "Top 10 Environmentally friendly sports cars". Nitrobahn.com. 29 November 2009. Archived from the original on 29 September 2010. Retrieved 18 September 2010.
  35. Bonander, Ross. "zap alias 3 wheeler". Futurecars.com. Archived from the original on 31 August 2010. Retrieved 18 September 2010.
  36. Brian Dumaine; Jamie Carroll; Ingrid Tharasook. "Putting the zoom into electric cars". CNN. Archived from the original on 16 September 2008. Retrieved 7 August 2008.
  37. "First 150mph Tango electric performance commuter to be delivered next week". gizmag.com. 19 May 2005. Retrieved 15 September 2008.