Patent ID: 8641320

Claim:
A road paver for laying road construction material, comprising: a tamping beam; a bunker for receiving road construction material; a wheeled chassis with a rear axle with at least two permanently driven rear wheels and with a steerable front axle comprising a single or tandem axle, and further comprising n 1 front wheels, with n 1 not equal to zero; means for determining the axle load of the front axle, the steering angle and the working speed of the road paver, and a hydraulic arrangement for permanent or optionally selectable drive of n 2 hydraulic motors, with n 2 not equal to zero, which are each coupled to a front wheel, with the hydraulic arrangement comprising: n 3 control valves with throttles, with n 3 not equal to zero, and with a cross section of each of the throttles being individually adjustable; n 4 pressure balances, with n 4 not equal to zero; a variable displacement pump; an electronic control unit which is configured so that it predetermines a reference differential pressure between a pump pressure (p p ) downstream of the variable displacement pump/upstream of the control valves and a highest load pressure (p LS ) downstream of the pressure balances/upstream of the hydraulic motors; a pressure measuring apparatus for determining an actual differential pressure between the pump pressure (p p ) and the highest load pressure (p LS ); and a pump control valve for adjusting the transport stream of the variable displacement pump, which is arranged in such a way that it adjusts the actual differential pressure to the reference differential pressure.