Heavy vehicle electro-hydraulic steering system and control method

The present invention provides a heavy vehicle electro-hydraulic steering system and a control method for a steering system includes an engine connected in sequence, electromagnetic slip clutch, steering pump, power steering cylinder and the valve, the valve is connected by steering with the steering wheel angle sensor, further It includes an electronic control unit and the electromagnetic clutch slip angle sensor connected (ECU). The present invention is in place when the vehicle is turning or low turning the electromagnetic clutch is fully engaged, the steering pump with the engine speeds to provide a large power, to meet the requirements of low speed steering light; high speed when the vehicle is turning, the electromagnetic clutch partially engaged , low speed steering pump, provide less power to meet the requirements of high speed steering stability, when the engine load is reduced, the power consumption is also reduced; when no steering, the ECU minimum output current to the steering pump low speed operation, thereby greatly reducing the power consumption of the engine.