As an auxiliary braking device, the eddy current retarder (ECR) has been widely used in heavy vehicles and can effectively protect the friction braking system. In order to solve the problem of articulated vehicle stability, an eddy current retarder axle (ECRA) is designed by integrating the ECR and the axle, which directly brakes the trailer. In order to increase the braking stability of the articulated vehicle, the differential braking characteristics of the ECRA is studied, and the vehicle body status is maintained through reasonable differential braking control (DBC). In this paper, the differential braking performance curve of the ECRA is studied, the mathematical model of the articulated vehicle is established. The experimental data of ECRA combined with the Sinmulik-TruckSim co-simulation method, the differential braking effect of the ECRA on the vehicle is analyzed, the stability of the vehicle is further studied.