Liquid Hydrogen-Powered Corolla to Participate in the Super Taikyu Fuji 24 Hours Race
Making improvements with agility in the two months since missing Suzuka
The liquid hydrogen-powered Corolla was scheduled to compete for the first time at Round 1 Suzuka Super Taikyu 5 Hours Race held on March 18 and 19. However, during a private test run at Fuji International Speedway on March 8, a vehicle fire occurred due to a hydrogen leak from a gaseous hydrogen pipe in the engine compartment. As the vehicle could not be recovered in time, Toyota was forced to abandon the race.
In the two months since missing Suzuka, the design of the hydrogen piping that caused the vehicle fire has been changed, with safety as the highest priority. These changes included (1) moving the hydrogen piping away from hot areas, and (2) installing safety covers on the hydrogen piping joints to prevent loosening and to catch and lead hydrogen to detectors in the event of a leak.
We have also succeeded in reducing the vehicle weight by over 50 kg over the past two months, leading to it exceeding the lap times of the hydrogen engine-equipped Corolla when it first competed in May 2021 using gaseous hydrogen fuel.
We have continued development and made improvements with agility through our motorsports activities with the support of our many partners in taking on this challenge, and this has made it possible for us to enter the Fuji 24 Hours Race.
The challenge of liquid hydrogen
A portion of the liquid hydrogen being used in the hydrogen engine-equipped Corolla is lignite-derived hydrogen produced and transported from Australia in February 2022 by the Suiso Frontier liquid hydrogen carrier built by Kawasaki Heavy Industries, Ltd. (KHI) as part of the HySTRA*1 project.
The mobile liquid hydrogen station that will be used at the circuit was jointly developed by Iwatani Corporation and Toyota Motor Corporation. By using liquid hydrogen as fuel, equipment that was previously necessary to produce compressed gaseous hydrogen, such as compressors and pre-coolers for cooling hydrogen are no longer needed. As a result, the required station installation area can be a quarter the size of that for gaseous hydrogen stations, and fuel can be refilled in the pit area in the same way as for gasoline-powered vehicles. In addition, since there is no longer the need to pressurize when filling, multiple vehicles can be filled in succession.
