LIFT AXLE CONTROL METHOD AND SYSTEM FOR VEHICLE

Disclosed in the present invention are a lift axle control method for a vehicle and a lift axle control system for a vehicle, wherein the control method comprises the following steps: step 1) acquiring a load M of the vehicle during running of the vehicle; step 2) judging whether the vehicle needs to lower the lift axle according to the load, and if so, controlling the vehicle to lower the lift axle, and then entering into step 3); otherwise, returning to step 1); step 3) acquiring the information of electronic horizon system in real time, calculating an optimal position of lifting the lift axle in a road ahead of a current position of the vehicle, controlling the vehicle to lift the lift axle when the vehicle reaches the optimal position of lifting the lift axle in the road ahead, and entering into step 4); step 4) calculating, by the electronic horizon system, an optimal position to lower the lift axle in the road ahead, controlling the vehicle to lower the lift axle when the vehicle reaches the optimal position to lower the lift axle, and then returning to step 3). The method of the present invention can not only reduce the damage to the road surface, but also utilize the lift axle to achieve the economy of fuel consumption during running of the vehicle to a maximum extent.