Research on the technical scheme of multi-stack common rail fuel cell engine based on the demand of commercial vehicle

Abstract

At present, most fuel cell engines are single-stack systems, and high-power single-stack systems have bottlenecks in meeting the power requirements of heavy-duty trucks, mainly because the increase in the single active area and the excessive number of cells will lead to poor distribution uniformity of water, gas and heat in the stack, which will cause local attenuation and reduce the performance of the stack. This paper introduces the design concept of internal combustion engine, takes three-stack fuel cell engine as an example, designs multi-stack fuel cell system scheme and serialized high-voltage scheme. Through Intelligent control technology of independent hydrogen injection based on multi-stack coupling, the hydrogen injection inflow of each stack is controlled online according to the real-time anode pressure to achieve accurate fuel injection of a single stack and ensure the consistency between multiple stacks. proves the performance advantage of multi-stack fuel cell engine through theoretical design, intelligent control and test verification, and focuses on analyzing the key technical problems that may exist in multi-stack consistency. The research results provide a reference for the design of multi-stack fuel cell engines, and have important reference value for the powertrain design of long-distance heavy-duty and high-power fuel cell trucks.