A method for promoting regeneration of an exhaust aftertreatment component of an internal combustion engine includes: detecting a low load operating condition of the internal combustion engine; adjusting a pitch angle of one or more blades of a fan to reduce an air flow across a radiator in response to the detection of the low load operating condition; and increasing a rotational speed of the fan to increase a load on the internal combustion engine and to elevate temperature of an exhaust gas flowing across the exhaust aftertreatment component.

A vehicle cooling system includes a first fan assembly, a second fan assembly, and a control unit. The first fan assembly generates a main cooling flow acting upon a first cooler arrangement. The second fan assembly generates a secondary cooling flow adjacent to the main cooling flow and acting upon a second cooler arrangement. The secondary cooling flow is branched off from the main cooling flow via the second fan assembly. The main and secondary cooling flows pass through a filter element located upstream of the first and second fan assemblies and the first and second cooler arrangements. The control unit is configured to determine an actual value of a rotational speed variable of the second fan assembly, compare the actual value with a desired value specified for a cleaned state of the filter element, and generate a trigger signal to initiate a reversing operation of the first fan assembly.

A fan control system for a variable pitch fan of a work vehicle includes a blade pitch module that adjust a pitch of a plurality of blades of the variable pitch fan to generate airflow in a first direction. A reversing module selectively commands a fan reversal that includes instructing the blade pitch module to temporarily adjust the pitch of the plurality of blades to generate airflow in a second direction. A first timer module, in response to the reversing module commanding the fan reversal, resets and increments a first timer and compares the first timer to a first threshold. A first reversal prevention module, in response to the first timer being less than the first threshold, prevents the reversing module from commanding a fan reversal by indicating that a first type of fan reversal is not permitted.

A fan control system for a variable pitch fan of a work vehicle includes a blade pitch module that adjust a pitch of a plurality of blades of the variable pitch fan to generate airflow in a first direction. A reversing module selectively commands a fan reversal that includes instructing the blade pitch module to temporarily adjust the pitch of the plurality of blades to generate airflow in a second direction. A first timer module, in response to the reversing module commanding the fan reversal, resets and increments a first timer and compares the first timer to a first threshold. A first reversal prevention module, in response to the first timer being less than the first threshold, prevents the reversing module from commanding a fan reversal by indicating that a first type of fan reversal is not permitted.

This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.

This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.

An air intake screen debris cleaning system may include an intake screen through which air is drawn in a first direction for cooling, a reverse airflow generation system to create a reverse airflow in a second direction opposite the first direction to clear debris from the intake screen, a sensor to sense debris that is collected on the intake screen and a controller to activate the reverse airflow generation system based upon signals from the sensor. In one implementation, the sensor comprises an emitter to emit a sensor beam that extends along a face of the air intake screen and which does not intersect or pass through the air intake screen prior to being sensed.

A method of rapidly cooling a high temperature vehicle coolant is disclosed. The method includes determining a coolant temperature lowering entry condition by detecting information on the coolant temperature, an engine speed, and a gear state and determining whether the coolant temperature needs to be rapidly lowered on the basis of the detected information; and changing a number of gear stages by adjusting the number of gear stages of a transmission to be reduced to a specific number of gear stages when the coolant temperature needs to be rapidly lowered in the determining of the coolant temperature lowering entry condition, so that the cooling fan is driven by driving the fan belt through a crank damper pulley using the increased engine speed according to the reducing adjustment of the number of gear stages.

A method of rapidly cooling a high temperature vehicle coolant is disclosed. The method includes determining a coolant temperature lowering entry condition by detecting information on the coolant temperature, an engine speed, and a gear state and determining whether the coolant temperature needs to be rapidly lowered on the basis of the detected information; and changing a number of gear stages by adjusting the number of gear stages of a transmission to be reduced to a specific number of gear stages when the coolant temperature needs to be rapidly lowered in the determining of the coolant temperature lowering entry condition, so that the cooling fan is driven by driving the fan belt through a crank damper pulley using the increased engine speed according to the reducing adjustment of the number of gear stages.

This radiator fan for cooling a radiator has: a rotating member that rotates due to rotation of an engine; blade members that are provided on the peripheral surface of the rotating member such that the angle of surfaces that receive air is changed; a moving member, which is provided in the rotating member, and which moves toward the peripheral surface of the rotating member due to centrifugal force generated by means of the rotation of the rotating member; and a connecting member, which is connected to the moving member and the blade members, transmits the movement of the moving member to the blade members, and changes the angle of the surfaces.