Method for controlling cooling fan-brake of construction equipment

1. A method for controlling a cooling fan-brake of construction equipment, comprising:

generating a brake charging signal of a brake unit in a normally controlled state;

wherein the normally controlled state includes a loading valve of a cooling fan unit in an on state and an unloading valve of the cooling fan unit in an off state;

making, by a controller, when a brake priority valve and a brake charging valve of the brake unit operate so that a hydraulic oil with a high flow rate is charged in the brake unit, the loading valve of the cooling fan unit to turn off and the unloading valve of the cooling fan unit to turn on when charging of the hydraulic oil; and

turning the loading valve of the cooling fan unit on and turning the unloading valve of the cooling fan unit off after the charging of hydraulic oil is completed and a predetermined time elapses.

2. The method of claim 1 , wherein the brake charging valve of the brake unit is turned off when the hydraulic oil is completely charged.

3. The method of claim 1 , wherein the predetermined time after the charging completion of the hydraulic oil is 0.5 second.

4. The method of claim 1 , wherein the controller detects a pressure of the brake charging valve and determines whether the hydraulic oil is in a charged state based on the pressure.

5. The method of claim 4 , wherein when the pressure of the brake charging valve detected is equal to or lower than 120 bar, the controller makes the hydraulic oil to be first charged in the brake charging valve.

6. The method of claim 4 , wherein the controller makes the brake charging valve to continue to charge until the pressure of the hydraulic oil is equal to or greater than about 140 bar.