Power-assisted steering system and mobile inspection device

A mobile inspection device, comprising:

• a vehicle, a radiation source and a detection device that are disposed on the vehicle, wherein the vehicle comprises a power-assisted steering system, wherein
• the power-assisted steering system comprises:
• a central control unit, a power-assisted steering motor and a first hydraulic pump connected to an engine on chassis, wherein the power-assisted steering system further comprises a directional control valve, a second hydraulic pump and a first driving motor, wherein the first driving motor is connected to the second hydraulic pump;
• the directional control valve is connected to each of the first hydraulic pump, the second hydraulic pump and the power-assisted steering motor so as to switch between a first oil path of the first hydraulic pump and a second oil path of the second hydraulic pump for driving the power-assisted steering motor;
• the central control unit is configured to:
• when receiving a travelling instruction, determine whether the engine on chassis has been started;
• and if the engine on chassis has not been started, control to start the first driving motor such that the first driving motor drives the second hydraulic pump and thus the power-assisted steering motor can be driven through the second oil path of the second hydraulic pump.