Toyota Motor is accelerating the development of hydrogen engines. Following the passenger car that announced its intention to commercialize, the project was started in the area of large commercial vehicles. The five companies will work together to examine the possibility of hydrogen engines in large commercial vehicles.
Isuzu Motors Ltd., Denso Motors Ltd., Hino Motors Ltd., and Commercial Japan Partnership Technologies (CJPT) have partnered with Toyota. The five companies announced on July 8, 2022 that they have started planning and basic research on hydrogen engines for large commercial vehicles.
”Isn’t mass production closer than a fuel cell vehicle (FCV)?” One engine engineer analyzes that hydrogen engines and large commercial vehicles are a good match. Based on the mainstream supercharged direct-injection diesel engine in large commercial vehicles, “it can be used with hydrogen engines by changing the fuel injection system,” said the engineer.
The point that the nitrogen oxide (NOx) aftertreatment system of diesel vehicles can be diverted is also great. Hydrogen engines do not emit carbon dioxide (CO 2 ) in principle, but emit a lot of NOx. There are several countermeasure technologies such as the urea SCR (selective reduction catalyst) system, and “performance evaluation is necessary, but basically it can be used as it is,” said the engineer.
One of the issues for practical use is “pre-ignition (early ignition, hereinafter referred to as” pre-ignition “)”. Plague is an abnormal combustion that occurs in a cylinder, and is a phenomenon that self-ignites faster than normal ignition. Toyota is also taking measures to develop hydrogen engines for passenger cars.