The invention relates to a dynamic load simulating device and a dynamic load simulating method for an automobile power 
system test, and belongs to the technical field of vehicle power 
system tests. The dynamic load simulating device comprises a control computer, a 
dynamometer controller, a frequency converter, an 
alternating current (AC) power 
dynamometer and a torque 
flange with a controller. A virtual automobile model-based 
control algorithm is adopted, a virtual automobile model is driven by an actual measurement torque, and the 
simulation of the 
rolling resistance, wind resistance and the 
inertia resistance of a vehicle is realized under the conditions of not calculating 
angular acceleration of the 
dynamometer. The dynamic load simulating device and the dynamic load simulating method have high stability and high 
simulation precision, are favorable for shortening the development cycle of an automobile power 
system and providing convenient test environment for the development of the power system. A process that the 
vehicle acceleration is acquired by differentiating the rotation speed of the automobile power system is avoided in the calculation process, and a phenomenon that accurate differential values are difficult to acquire due to relatively large 
noise caused by the process of differentiating the rotation speed is prevented.