Device and method for testing hydrogen consumption and engine working efficiency of hydrogen fuel cell commercial vehicle

The invention belongs to the technical field of new energy, and provides a hydrogen fuel cell commercial vehicle hydrogen consumption and engine working efficiency test device and method, and the method comprises the steps: collecting water generated in the working process of a fuel cell and hydrogen which does not participate in a chemical reaction through a water collection tank and a hydrogen collection device; obtaining the mass of the water and the hydrogen which does not participate in the chemical reaction by adopting a weighing method; calculating the mass of the hydrogen participating in the chemical reaction according to the mass of the water; the hydrogen consumption can be obtained through the sum of the mass of the hydrogen participating in the chemical reaction and the mass of the hydrogen not participating in the chemical reaction; meanwhile, the working efficiency of the engine can be calculated according to the mass and the hydrogen consumption of the hydrogen participating in the chemical re