Provided is a method for controlling a water temperature of an engine. The method includes: collecting outlet water temperatures of the engine at predetermined time intervals (S101); when a number of the collected outlet water temperatures of the engine is greater than or equal to a predetermined number, determining a water temperature variation function of the outlet water temperatures of the engine with time according to collected each outlet water temperature of the engine and collection time corresponding to the each outlet water temperature of the engine (S102); and determining performance parameters of a cooling system under the water temperature variation function, and controlling controllable parts of the cooling system according to the performance parameters of the cooling system (S103).

A control method for an integrated thermal management system of a vehicle includes: comparing an engine coolant temperature with a predetermined first set temperature after vehicle start; when the engine coolant temperature is greater than the first set temperature, comparing an ambient temperature with a set ambient temperature and comparing an air conditioner refrigerant pressure with a set pressure; and when the ambient temperature is greater than the set ambient temperature and the air conditioner refrigerant pressure is greater than the set pressure, controlling opening and closing operations of an integrated flow control valve based on the air conditioner refrigerant pressure so as to increase a flow rate of coolant that is supplied to a radiator through the integrated flow control valve.

A control method for a cooling system includes determining, by the controller, whether the output signal of the ambient temperature sensor satisfies a predetermined an ambient low temperature driving condition, determining, by the controller, whether the output signal of the first coolant temperature sensor satisfies a predetermined first low temperature driving condition when the output signal of the ambient temperature sensor satisfies the predetermined the ambient low temperature driving condition and controlling, by the controller, the operation of the coolant control valve unit to open the first coolant passage and the third coolant passage and to close the second coolant passage when the output signal of the first coolant temperature sensor satisfies the predetermined first low temperature driving condition.

Method of controlling cooling water temperature of an engine in which the lower limit value of engine rotation speed is set according to outside air temperature and vehicle speed. When the vehicle starts traveling, a temperature raising-state lower limit rotation speed is set to raise the cooling water temperature to a third threshold value. After the cooling water temperature is raised to the third threshold value, the lower limit value is not set. If the cooling water temperature drops to a second threshold value, a maintaining-state lower limit rotation speed lower than the temperature raising-state lower limit rotation speed is set to raise the cooling water temperature. If the cooling water temperature does not rise but drops to a first threshold value, a temperature re-raising-state lower limit rotation speed lower than the temperature raising-state lower limit rotation speed and higher than the maintaining-state lower limit rotation speed is set.

A method of identifying air flow faults within a cooling system of an automobile comprises measuring the temperature of coolant entering a heat exchanger for the cooling system, measuring the temperature of coolant leaving the heat exchanger, and measuring the temperature of ambient air that is flowing into the heat exchanger, calculating Actual Delta T by subtracting the temperature of coolant leaving the heat exchanger from the temperature of coolant entering the heat exchanger, calculating Expected Delta T, wherein Expected Delta T is a pre-determined value of an expected difference between the temperature of the coolant entering the heat exchanger and the temperature of the coolant leaving the heat exchanger, calculating Effective Delta T by subtracting Expected Delta T from Actual Delta T, and identifying a fault in the air flow through the heat exchanger based on the value of Effective Delta T.

The work vehicle includes an engine, a radiator; a hydraulic pump; a cooling fan that blows a cooling air to the radiator; a hydraulic motor which is driven by a pressure oil delivered from the hydraulic pump, and rotates the cooling fan; a directional control valve that switches a flow direction of the pressure oil from the hydraulic pump to rotate the hydraulic motor in forward and reverse directions; and a controller that controls the directional control valve so as to cause the repetitive operation of the forward and reverse rotation of the cooling fan to be performed at predetermined time intervals, in which the controller reduces the time intervals more than a normal time initially set when a relationship between the outside air temperature detected by the outside air temperature sensor and the refrigerant temperature detected by the refrigerant temperature sensor satisfies a predetermined condition.

A cooling system includes an electric pump, a cooling target temperature sensor, a coolant temperature sensor, and an electronic control unit. The electric pump pumps a coolant to a circulation channel connected to an inlet and an outlet of a cooling channel in which heat is exchanged with a cooling target. The cooling target temperature sensor detects a cooling target temperature. The coolant temperature sensor is arranged upstream of the inlet in the circulation channel, and detects a coolant temperature. The electronic control unit controls driving of the electric pump so that a discharge flow rate of the electric pump matches a target flow rate, and sets the target flow rate using an equation based on a reference value obtained by dividing a difference between the cooling target temperature and a target cooling temperature of the cooling target by a difference between the cooling target temperature and the coolant temperature.

A controller for a motor vehicle cooling system thermostatic valve assembly, the assembly having a radiator bypass coolant flow inlet, a radiator coolant flow inlet and a coolant outlet, the assembly being configured to allow flow of coolant from the bypass coolant flow inlet to the coolant outlet and from the radiator coolant flow inlet to the coolant outlet, the assembly comprising means for controlling a flow rate of fluid from the radiator coolant flow inlet to the coolant outlet, the controller being configured to receive an ambient temperature signal indicative of an ambient air temperature, the controller being configured to control flow of coolant from the radiator coolant flow inlet to the coolant outlet in dependence at least in part on the ambient temperature signal.

Methods and systems for managing a monitoring of an engine cooling system. A transient condition associated with an engine system is identified. A determination is made as to whether the transient condition is a delay condition based on whether the transient condition exceeds a transient threshold. A determination is made, in response to a determination that the transient condition is not the delay condition, as to whether a period of time that has passed since a previously identified delay condition meets a time threshold. Monitoring of a health of the engine cooling system is enabled in response to a determination that the period of time meets the time threshold.

A control method for a cooling system is provided. The system includes a vehicle operation state detecting portion having an ambient temperature sensor, first and second coolant temperature sensors, a coolant control valve unit that adjusts opening rates of first, second, and third coolant passages and a controller. The method includes determining whether an output signal of the ambient temperature sensor satisfies a predetermined an ambient low temperature driving condition and whether an output signal of the first coolant temperature sensor satisfies a predetermined first low temperature driving condition when the output signal of the ambient temperature sensor satisfies the predetermined the ambient low temperature driving condition. The coolant control valve unit opens the first and coolant passages and closes the second coolant passage when the output signal of the first coolant temperature sensor satisfies the predetermined first low temperature driving condition.