A cooling system selectively cools an engine and an exhaust gas recirculation (EGR) component of the engine. The cooling system includes a plumbing system with a plurality of flow branches, including an engine branch, an EGR branch, and a feed branch. The engine branch defines an engine flow passage through which the coolant flows to cool the engine. The EGR branch defines an EGR flow passage through which the coolant flows to cool the EGR component. The feed branch defines a feed flow passage. The cooling system has a first operating configuration in which the EGR flow passage is configured to receive coolant flow from the engine flow passage. The cooling system has a second operating configuration in which the EGR flow passage is configured to receive coolant flow from the feed flow passage instead of the engine flow passage.

A method of controlling cooling fluid flow through a radiator system having multiple radiator cores comprises flowing cooling fluid through the radiator system, the radiator system comprising a first radiator core and a second radiator core, sensing a first temperature of ambient air, comparing the first temperature to a first threshold temperature and reducing flow through the first radiator core if the first temperature is below the first threshold temperature. The first radiator core has a first valve, and the second radiator core can have a second valve. The first valve can be opened to allow for parallel flow of cooling fluid through the first radiator core and the second radiator core between an inlet manifold and an outlet manifold and closed to interrupt flow of cooing fluid through the first radiator core between the inlet manifold and the outlet manifold.

The present disclosure relates to a method for determining an actuating value for a coolant pump or a control valve of a cooling system for an infernal combustion engine of a motor vehicle. In particular, a pre-control value for ascertaining the actuating value is determined in a first determination mode based on a prescribed first allocation as a function of an output variable of the infernal combustion engine and a temperature difference of a heat exchanger of the cooling system.

A control device for a vehicle includes a failure detector to detect failure in a cooling device to cool an internal combustion engine of the vehicle. An acceleration operation sensor is to detect an acceleration operation amount indicating a target acceleration. Circuitry is configured to control a power output from the internal combustion engine in accordance with the acceleration operation amount, control an air fuel ratio of air-fuel mixture in the internal combustion engine to be in a richer side with respect to a predetermined air fuel ratio if the acceleration operation amount exceeds a high load threshold, limit the power output from the internal combustion engine if the failure detector detects the failure, and prohibit the air fuel ratio from being controlled to be in the richer side even if the acceleration operation amount exceeds the high load threshold if the failure detector detects the failure.

A cooling system for a vehicle, includes a first cooling circuit including a first coolant passage and a first pump. The first pump is provided in the first coolant passage to circulate coolant in the first cooling circuit so as to cool a first device to a first temperature. A second cooling circuit includes a second coolant passage and a second pump. The second pump is provided in the second coolant passage to circulate coolant in the second cooling circuit so as to cool a second device to a second temperature. The second temperature is lower than the first temperature. The coolant introduction passage connects the first cooling circuit and a connected portion of the second cooling circuit between the second device and a second radiator and upstream of the second device to supply the coolant in the first cooling circuit to the second cooling circuit.

A thermostat with a temperature sensitive valve and a sample orifice for delivering sample fluids from a predetermined site, such that the actuation of the temperature sensitive valve is conducted based on the temperature of the sample fluids.

A control unit stores a correlation between a temperature difference T between an inlet temperature and an outlet temperature of a heat exchanger for cooling of cooling water, and the amount of thermal deformation occurring in the heat exchanger. At the time when the cooling water is supplied to the heat-exchanging flow path having the heat exchanger, the control unit refers to the temperature difference T and the correlation to obtain the volume of flow of the cooling water supplied to the heat-exchanging flow path so that the amount of thermal deformation is less than or equal to a threshold amount of thermal deformation set in advance.

A method of controlling cooling fluid flow through a radiator system having multiple radiator cores comprises flowing cooling fluid through the radiator system, the radiator system comprising a first radiator core and a second radiator core, sensing a first temperature of ambient air, comparing the first temperature to a first threshold temperature and reducing flow through the first radiator core if the first temperature is below the first threshold temperature. The first radiator core has a first valve, and the second radiator core can have a second valve. The first valve can be opened to allow for parallel flow of cooling fluid through the first radiator core and the second radiator core between an inlet manifold and an outlet manifold and closed to interrupt flow of cooing fluid through the first radiator core between the inlet manifold and the outlet manifold.

A system for warming lubricant of a gearbox includes a heat exchanger connected to the gearbox, the gearbox configured to send the lubricant to the heat exchanger and the heat exchanger configured to receive the lubricant from the gearbox, warm the received lubricant using bleed air from an engine located proximate the heat exchanger, and return the warmed lubricant to the gearbox.