Vehicle speed signal processing system

The invention provides a vehicle speed signal processing system, which belongs to the technical field of vehicles and solves the problem that a vehicle speed cannot be acquired when a vehicle speed sensor of the conventional vehicle speed signal processing system is failed. The vehicle speed signal processing system comprises the vehicle speed sensor, an engine controller EMS and a combination instrument ICU, wherein the engine controller EMS and the combination instrument ICU can acquire a first vehicle speed signal and a second vehicle speed signal from the vehicle speed sensor respectively. The system also comprises a wheel speed signal processing device, a CAN bus and a gateway, wherein the wheel speed signal processing device can acquire a wheel speed signal and convert the wheel speed signal into a third vehicle speed signal; and the gateway can receive one or more of the first, second and third vehicle speed signals through the CAN bus and select one vehicle speed signal according to a selection mechanism of the gateway, wherein the selection mechanism refers to that the first vehicle speed signal is an optimal selection. The vehicle speed signal processing system has the advantage of acquiring the vehicle speed signals even when the vehicle speed sensor is failed.