Engineering vehicle and electronic control hydraulic steering system, control method and controller thereof

The invention relates to the field of hydraulic control, in particular to an engineering vehicle, an electronic control hydraulic steering system of the engineering vehicle, a control method and a controller. The electric control hydraulic steering system is applied to the steering process of an engineering vehicle and comprises an integrated oil cylinder, a steering pump and a control valve group. The integrated oil cylinder is connected with the steering pump through an oil way, the steering pump provides high-pressure oil for the integrated oil cylinder so as to provide driving force, the control valve group is connected to the oil way between the integrated oil cylinder and the steering pump, and the electric control hydraulic steering system controls the engineering vehicle to conduct steering or centering by controlling switching of the first state and the second state of the control valve group. According to the electric control hydraulic steering system, the steering oil cylinder and the centering oil