Engineering:Subaru Global Platform

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Subaru Global Platform
European Premiere Subaru Impreza 3 – Press conference IAA 2017 by Nicolas Völcker.jpg
Fifth-generation Subaru Impreza hatchback, the first vehicle to use the Subaru Global Platform
Overview
ManufacturerSubaru
Production2016–present
Chronology
PredecessorSI chassis (SIシャシー)[1]

The Subaru Global Platform (スバルグローバルプラットフォーム), abbreviated as SGP, is the modular unibody automobile platform for nearly all models manufactured by Subaru, starting with the fifth-generation Subaru Impreza in 2016.[2] The primary dynamic benefits of SGP compared to prior Subaru platforms were improved strength, increased rigidity, and a lowered center of gravity. In addition, moving to a common platform made production more flexible and efficient; existing production lines could shift to meet demand by producing different models without significant reconfiguration, and common parts could be reused between models.

(As of 2021), SGP underpins all of the vehicles built and sold by Subaru. The WRX, debuting its second generation on September 10, 2021 for model year 2022, was the last model to move to the SGP. Models built by other manufacturers and rebadged by Subaru (such as the Justy and kei car models), and the jointly-developed Subaru BRZ/Toyota 86 do not use the SGP, although the platform for the second-generation BRZ/86 has been influenced by SGP.

Design

SGP is the first completely new platform for Subaru since the development of the first generation Legacy in the late 1980s; subsequent Subaru vehicles used a derivative of the original Legacy platform,[3] last significantly renewed with the introduction of the fourth generation Legacy in the early 2000s.[4] The Legacy-derived platform was given the SI chassis (SIシャシー)[5] (SUBARU Intelligent-Chassis) designation in 2007;[6] the 'SI chassis' featured a fully-independent suspension, with front struts and rear double wishbones.[7] SGP retains the same basic front strut/rear wishbone suspension as 'SI chassis', with refinements to improve rigidity.[8]:4

Fifth-generation Impreza project general manager Kazuhiro Abe stated that moving to SGP was a generational change comparable to the shift from the Leone to the Legacy.[9] The fifth-generation Impreza was developed over four years and at a cost of US$1 billion, a significant fraction of which went to developing SGP.[10] Structural adhesives are used to join the floor panel and side members. Hot rolled steel in the 590 MPa (86 ksi) strength class is used in the side members and sills, and pillars, reinforced with 1,470 MPa (213 ksi) strength class steel to protect the passenger compartment.[8]:2 Subaru claim the SGP enhances vehicle "dynamic feel" with specific benefits to:[11]

  1. Straight line stability (due to improvements in rigidity and lowered center of gravity)
  2. Noise and vibration control (due to improvements in frame strength and joining processes to increase torsional rigidity)
  3. Comfort (due to a reduction in body roll by mounting the rear stabilizer directly to the body)

In addition, both passive and active safety features are improved; SGP has a lower center of gravity, allowing more agile handling and enhancing crash avoidance, and uses high-tensile steel, enabling the structure to absorb 40% more impact energy compared to prior models.[11] SGP is also equipped with pedestrian protection airbags in certain markets.[4] Crash tests of the updated models using SGP led Euro NCAP to declare the Impreza and XV (2017, small family car) and Forester (2019, small off-road/MPV) had performed the best in their respective classes of all automobiles tested in those years.[12][13] JNCAP also awarded the Impreza, XV, and Forester with its Grand Prix Award for collision safety performance assessment in those years.[14]

SGP was designed to allow different drivetrains to be fitted, including conventional internal combustion engines, hybrid gasoline/electric, and battery-electric.[11] Although initial plans had a future electric car being developed using SGP,[15] Subaru and Toyota announced in June 2019 they would jointly develop a C-segment battery electric SUV on a new platform;[16] in December 2020, Subaru confirmed the forthcoming SUV would be based on the e-TNGA platform instead of SGP.[17]

Production efficiencies for SGP-based models could be realized by manufacturing platform components for different models at the same factory, and the same line could be used to assemble multiple models.[11]

Applications

Vehicles using platform (calendar years):


The second-generation Subaru BRZ/Toyota GR86, jointly developed with Toyota, uses neither the SGP nor the Toyota New Global Architecture (TNGA) platform, but the "knowledge and techniques" gained from the development of SGP were credited with increasing chassis rigidity and stiffness for the new BRZ.[26] The first-generation BRZ/86 had used an SI chassis-derived platform.[27]

  • Subaru Impreza (fifth generation)

  • Subaru Impreza (sixth generation)

  • Subaru XV/Crosstrek (second generation)

  • Subaru XV/Crosstrek (third generation)

  • Subaru Ascent

  • Subaru Forester (fifth generation)

  • Subaru Legacy (seventh generation)

  • Subaru Outback (sixth generation)

  • Subaru Levorg (second generation)

  • Subaru WRX (second generation)

See also

References

  1. ↑ "最近よく聞く「グローバルプラットフォーム」 何がいいの？ 賞味期限は？". Best Car. April 29, 2020. https://bestcarweb.jp/news/entame/148180?prd=3. 
  2. ↑ Stoklosa, Alexander (7 March 2016). "Subaru Global Platform Debuts, Will Underpin All Future Subarus". Car and Driver. https://www.caranddriver.com/news/a15349746/subaru-global-platform-debuts-will-underpin-all-future-subarus/. 
  3. ↑ "開発ストーリー|スバルグローバルプラットフォーム 篇". Subaru of Japan. https://www.subaru.jp/brand/technology/story/sgp.html. 
  4. ↑ 4.0 4.1 Masahiko Inoue (August 15, 2017). "【インタビュー】スバル新型「XV」にSUV初採用したSGPのメリットとは？" [[Interview] What are the merits of SGP, which was first adopted as an SUV for the new Subaru 'XV'?]. Car Watch (Interview) (in 日本語). Interviewed by Kiyoshi Tanikawa. Retrieved 9 April 2021.
  5. ↑ "新型 スバル インプレッサを発表" [Announcing the New Subaru Impreza] (Press release) (in 日本語). Subaru of Japan. November 30, 2011. Retrieved 8 April 2021.
  6. ↑ "スバル フォレスターをフルモデルチェンジ ～新世代クロスオーバー「ＮＥＷ フォレスター」を発売～" (Press release). 富士重工業. 2007-12-25. Retrieved 2021-05-06.
  7. ↑ Matsuda, Hideshi (July 1, 2015). "スバル「インプレッサ スポーツ」「インプレッサ G4」（2014年モデル）". Car Watch. https://car.watch.impress.co.jp/docs/news/impression/709354.html. 
  8. ↑ 8.0 8.1 "スバル・インプレッサのメカニズムを徹底解説！-スバルグローバルプラットフォーム（SGP）". Motor Fan. September 8, 2018. https://motor-fan.jp/article/10005431. 
  9. ↑ Kazuhiro Abe (March 31, 2016). "【インタビュー】スバル 新型「インプレッサ」開発主査 阿部氏に聞く" [[Interview] Interview with Mr. Abe, Development Chief of Subaru's new 'Impreza']. Car Watch (Interview) (in 日本語). Interviewed by Hiroyuki Manabe. Retrieved 8 April 2021.
  10. ↑ Lyon, Peter (September 21, 2016). "Subaru's New Impreza Cost $1B -- Was It Worth It?". Forbes. https://www.forbes.com/sites/peterlyon/2016/09/21/subarus-new-impreza-cost-1b-was-it-worth-it/. 
  11. ↑ 11.0 11.1 11.2 11.3 "FHI Unveils the 'Subaru Global Platform' — Subaru's next-generation platform to achieve significant enhancement in overall vehicle performance" (Press release). Subaru Global Media. March 7, 2016. Retrieved 8 April 2021.
  12. ↑ "Best in Class Cars of 2017". https://www.euroncap.com/en/ratings-rewards/best-in-class-cars/2017/. 
  13. ↑ "Best in Class Cars of 2019". https://www.euroncap.com/en/ratings-rewards/best-in-class-cars/2019/. 
  14. ↑ "All-new Subaru Forester wins Grand Prix award for earning the highest score in 2018-2019 JNCAP collision safety performance assessment". Automotive World. May 30, 2019. https://www.automotiveworld.com/news-releases/all-new-subaru-forester-wins-grand-prix-award-for-earning-the-highest-score-in-2018-2019-jncap-collision-safety-performance-assessment/. 
  15. ↑ Walsworth, Jack (September 3, 2018). "Subaru adds models to global platform". Automotive News. https://www.autonews.com/article/20180903/OEM04/180909979/subaru-adds-models-to-global-platform. 
  16. ↑ "Toyota and Subaru Agree to Jointly Develop BEV-dedicated Platform and BEV SUV" (Press release). Toyota Global Newsroom. June 6, 2019. Retrieved 8 April 2021.
  17. ↑ Raynal, Wes (December 15, 2020). "Subaru Confirms EV for Europe". Autoweek. https://www.autoweek.com/news/green-cars/a34967618/subaru-confirms-ev-for-europe/. 
  18. ↑ "World Premiere of All-New Subaru Impreza at New York International Auto Show" (Press release). Subaru Global Media. March 24, 2016. Retrieved 8 April 2021.
  19. ↑ "World Premiere of All-New Subaru XV at 2017 Geneva International Motor Show" (Press release). Subaru Global Media. March 7, 2017. Retrieved 8 April 2021.
  20. ↑ "Subaru Debuts All-New Ascent 3-Row SUV" (Press release). Subaru Global Media. November 29, 2017. Retrieved 8 April 2021.
  21. ↑ "World Premiere of All-New 2019 Subaru Forester at New York International Auto Show" (Press release). Subaru Global Media. March 29, 2018. Retrieved 8 April 2021.
  22. ↑ "World Premiere of All-New 2020 Subaru Legacy Sedan" (Press release). Subaru Global Media. February 8, 2019. Retrieved 8 April 2021.
  23. ↑ "World Premier of All-New 2020 Subaru Outback" (Press release). Subaru Global Media. April 18, 2019. Retrieved 8 April 2021.
  24. ↑ "ＳＵＢＡＲＵ 新型「レヴォーグ」を発表" [Subaru Announces New 'Levorg'] (Press release) (in 日本語). Subaru Global Media. October 15, 2020. Retrieved 8 April 2021.
  25. ↑ Silvestro, Brian (August 30, 2019). "The 2021 WRX STI Will Get 315 HP and Subaru's New Global Platform". Road & Track. https://www.roadandtrack.com/new-cars/future-cars/a28869565/2021-subaru-wrx-sti-new-engine-global-platform-news/. 
  26. ↑ "World Premiere of All-New Subaru BRZ" (Press release). Subaru Global Media. November 18, 2020. Retrieved 8 April 2021.
  27. ↑ Manabe, Hiroyuki (March 7, 2011). "【2011ジュネーブショー】スバル、FRスポーツの技術コンセプトモデル「ボクサー スポーツカー アーキテクチャ」". Car Watch. https://car.watch.impress.co.jp/docs/event_repo/2011geneve/431432.html. 

External links



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