Lift axle control method and system for vehicle

A lift axle control method for a vehicle, wherein the lift axle 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 a lift axle according to the load M, and when the vehicle needs to lower the lift axle according to the load M, controlling the vehicle to lower the lift axle, and then entering into step 3);
• otherwise, returning to step 1);
• step 3) acquiring information of an electronic horizon system in real time, calculating an optimal position for 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 for lifting the lift axle, and entering into step 4);
• and
• 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).