DETAILED DESCRIPTION OF THE DRAWINGS
 In the construction machine, the construction mechanical heat dissipation system using electronic fan driving air is used to include a plurality of heat sink cores, and a plurality of heat sink cores are integrated to form a heat sink core assembly 1. In the engineering machinery, in each of the heat sink cores, the heat dissipation requirements of some radiator cores are different, and the heat sink needs of partial heat sink cores are the same, and the heat sink cores with the same heat dissipation requirement are typically overlapping on the air. Adjacent arrangement. For each radiator core, at least an electronic fan is configured to divide a plurality of electronic fans into a plurality of groups, each set of electronic fans correspond to a radiator core or a heat sink core having a plurality of heat dissipation requirements.
 Such as figure 1 As shown, the construction mechanical heat dissipation system in this embodiment includes a heat sink core assembly 1, an electronic fan 2, a controller 5, a display 6, a temperature detecting device 4, a rotational speed detecting device for detecting the electronic fan speed.
 The electronic fan 2 is nine, and each three electronic fan 2 is divided into three groups, each set of three electronic fan 2. In the present embodiment, the heat sink is divided into three heat dissipation regions 11 in accordance with the heat dissipation requirements The heat sink core, and each heat dissipation region 11 is configured with an electronic fan group. The division of the electronic fan group is divided according to the heat dissipation requirements and arrangement of the radiator core. Each of the electronic fans in each group is connected to the controller 5 through the electronic fan drive cable 51, and the controller 5 outputs current to control the rotational speed of each of the electronic fan 2, so that it satisfies the heat dissipation requirements of each heat dissipation region.
 The rotational speed detecting means includes a plurality of speed sensors 3, and each electronic fan 2 is provided with a rotational speed sensor 3. The speed sensor 3 is connected to the controller 5 via the signal transmission cable 31 such that the controller 5 can acquire the actual speed of each electronic fan 2 in real time.
The display 6 is connected to the controller 5 by the display signal transmission cable 61, and the controller 5 is used to display the working conditions of the heat sink, for example, the temperature parameters of each radiator core, the actual speed and theoretical speed of each electronic fan, or abnormal The corresponding alarm information is displayed.
 The temperature measurement device 4 (typically a temperature sensor) is used to detect temperature parameters of the heat sink system, such as for detecting the cooling liquid inlet temperature and outlet temperature of each radiator core, and the temperature of the temperature measurement device 4 and the controller 5 Connecting, the controller 5 obtains the temperature of each radiator core by the temperature measurement device 4, thereby determining the heat dissipation requirements of the area where the radiator core is located, and the output control current makes the corresponding electronic fan working in the corresponding theoretical speed state. To meet the heat dissipation requirements of each radiator core.
 The electronic fan control method in this embodiment is as follows:
 The temperature parameters of the heat dissipation system are detected by the temperature measurement device 4, and the controller 5 determines the theoretical speed of each electronic fan 2 based on the temperature parameter; that is, according to the temperature parameters of each radiator core in the heat dissipation system, the three sets of electronic fan 2 is determined, respectively. Theoretical speed. Three theoretical speeds were two or two comparisons based on the theoretical speed of the three sets of electronic fan 2 according to the temperature parameters. For example, the theoretical speed of the first set of electronic fans is N1, the theoretical speed of the second set of electronic fans is N2, N2> N1.
 When comparing, if N2-N1
 When it is determined whether the difference between the two theoretical speeds is in the respective threshold range, the difference can also be compared to a smaller theoretical speed N1, or compare the average of the two theoretical speeds.
 The actual speed of each electronic fan 2 is detected by the rotational speed sensor, and the controller 5 uses closed loop control to rotate the electrical fan rotation according to the actual speed of each electronic fan, using closed loop control, respectively, outputs current driving each electronic fan rotation, operates in theoretical speed. That is, the driving of the electronic fan is controlled by the electronic fan and the drive current one-to-one, the drive current of the two theoretical speeds may differ.
 When the theoretical speed of each electronic fan is determined, the alarm information is displayed if the timing length reaches a predetermined value and has the actual speed of the electronic fan 2 smaller than the theoretical speed of the electronic fan 2, and the alarm information is displayed, prompting the operator heat dissipation system possible failure.
 In the present embodiment, the theoretical speed of each electronic fan is avoided (there is a difference between the speed, but the difference is small, which causes a shot) to cause the vibration generated between the electronic fan group, and for the same electronic fan group The actual speed of each electronic fan is controlled, so that the actual speed of the electronic fans in the same group is equal to the theoretical speed, thereby avoiding the production of oscillates between the various electronic fans in the same group, thereby achieving the entire heat dissipation system. The electronic fan is generated, and the electronic fan does not greatly reduce the service life of the heat dissipation system due to the phosphor, and the cab does not produce periodic vibration due to the vibration. Cab comfort.