A transmission system includes planetary gearing with a ring gear, a plurality of planet gears, a carrier, and a sun gear, a forward clutch operatively connected between the ring gear and carrier, a reverse brake operatively connected between the carrier and a rotationally fixed location, and a control subsystem to switch the transmission system between forward and reverse operational modes in the which the ring gear and the sun gear rotate in the same or opposite rotational directions, respectively. A control subsystem actuation stroke can actuate both the forward clutch and the reverse brake based on a common control signal.

To provide a construction machine capable of reducing the time and labor of an operator and reliably preventing deterioration of cooling efficiency of a heat exchanger unit. A construction machine includes a heat exchanger unit having a plurality of heat exchangers, a cooling fan configured to supply cooling air to the heat exchanger unit during a forward rotation thereof, a controller configured to control an operation of the cooling fan, a timer configured to count an operation time period of forward rotation of the cooling fan, and a reverse rotation signal output switch configured to output to the controller a reverse rotation signal for causing the cooling fan to rotate in the reverse direction in response to an applied manual operation. The controller causes the cooling fan to rotate in the reverse direction for a second predetermined time period and resets the timer at the time of finishing the reverse rotation of the cooling fan, if the operation time period of forward rotation counted by the timer reaches a first predetermined time period, and controller causes the cooling fan to rotate in the reverse direction for the second predetermined time period when the reverse rotation signal is output from the reverse rotation signal output switch, and resets the timer at the time of finishing the reverse rotation of the cooling fan, even if the operation time period of forward rotation counted by the timer has not reached the first predetermined time period.

A fan control system for a variable pitch fan of a work vehicle includes a first sensor that measures a parameter of a cooling system and 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.

An air-cooled internal combustion engine including a crankshaft rotating about a crankshaft axis, a first cylinder having a first cylinder head, a second cylinder having a second cylinder head, and a blower assembly. The blower assembly includes a blower housing, a first fan, and a second fan. The first fan is positioned proximate the first cylinder and the second fan is positioned proximate the second cylinder.

A control system for controlling a work machine includes an engine for producing power to propel the work machine during a normal operating mode, a cooling system for cooling at least the engine during the normal operating mode, and a controller for controlling the cleaning system during the normal operating mode and a clean operating mode. During the normal operating mode, the engine is running and the controller operably controls a cooling fan of the cooling system to rotate in a first rotational direction to produce a first air flow in a first direction. During the clean operating mode, the engine is not running and the controller operably controls the cooling fan to rotate in a second rotational direction to produce a second air flow in a second direction. The first rotational direction is opposite the second rotational direction, and the first direction is opposite the second direction.

The invention relates to a cooling module for an electric or hybrid vehicle, the cooling module having a housing including an air inlet and an air outlet and within which there are arranged an assembly of heat exchangers and a tangential turbomachine configured so as to generate an air flow passing through the housing from its air inlet to its air outlet and passing through the assembly of heat exchangers. The housing has, on one of its outer lateral faces, a two-fluid heat exchanger in order to allow the exchanges of heat energy between a first heat-transfer fluid circulating in a first circulation loop and a second heat-transfer fluid circulating in a second circulation loop.

A vehicle radiator air intake screen maintenance system comprising a radiator fan, a fan motor; and a processor operable to control the rotational speed and direction of the radiator fan to: periodically implement a drop cycle whereby a radiator cooling air flow generated by the fan rotating in a forward direction is slowed such debris collected on a radiator air intake screen of the vehicle is caused to fall off due to gravitational force; and periodically implement a full reverse cycle where a rotational direction of the fan is reversed and an expulsion air flow is generated whereby debris collected on vehicle radiator and the air intake screen will be blown off, whereafter reverse rotation of the fan is stopped and the fan is returned to the full forward operating speed and direction.

A cooling system for a vehicle includes a heat exchanger unit which cools a heat medium by heat exchange with air, a fan which sends air to flow through the heat exchanger unit, and a shutter which switches between an opening and a closing of a pathway through which air flows from an outside toward the heat exchanger unit. A control unit controls operations of the fan and the shutter, an index acquisition unit acquires a heat radiation index showing a magnitude of a radiation amount required in the heat exchanger unit, and a fixing determination unit determines whether the shutter is closed and fixed. The control unit performs a control in which the fan is driven while the shutter is closed, when the heat radiation index is equal to or lower than a predetermined threshold.

A vehicle includes an air-path portion, an engine, and a rotating fan located more rearward than first and second seats. A wind pressure near the air-path portion located on a side surface of the vehicle is detected by a pressure sensor, and based on a detection result, an ECU controls a direction of rotation of the rotating fan. The rotating fan introduces/discharges air to/from an engine room via the air-path portion. If the pressure sensor detects a negative pressure, the rotating fan is controlled so as to discharge air from the engine room via the air-path portion. On the other hand, if the pressure sensor detects zero or a positive pressure, the rotating fan is controlled so as to introduce air to the engine room from the air-path portion.

Methods and systems are provided for diagnosing an active grille shutter (AGS) system. In one example, a method may include indicating degradation of an AGS system of a vehicle based on an infrared image information obtained from a camera coupled to the vehicle and adjusting one or more engine operating parameters responsive to the indicating.