Various methods and systems are provided for a thermal management system of an engine. A method for an engine may comprise adjusting an engine speed during an engine start event that includes an engine cranking activity from a first engine speed to a second engine speed, where the adjusting is based on a sensed oil temperature; adjusting a first resistance of a radiator primary return line of a thermal management system to a first resistance level; and adjusting the engine speed a duration after a start of the engine cranking from the second engine speed to a third engine speed, the third engine speed based at least in part on an engine torque demand, and selectively adjusting the first resistance between each of the first resistance level and a second resistance level based on the third engine speed, the second resistance level being lower than the first resistance level.

The disclosure relates to a thermal management system for a vehicle. The thermal management system can comprise at least one degassing pipe comprising at least one degassing pipe end and a filling pipe. The at least one degassing pipe can be connected to a degassing tank by means of at least one connecting port being arranged at a side wall of the degassing tank. The filling pipe can be connected to the degassing tank by means of a filling port being arranged at the bottom of the degassing tank. The at least one degassing pipe end can be arranged below a limit level of the degassing tank and at a first distance from the filling port of the filling pipe.

A cooling apparatus for an engine includes a main circuit, a warm-up circuit, a coolant passage, a coolant pump, a pre-branching passage, a coolant temperature sensor and an agitator. The warm-up circuit allows a coolant to bypass the main circuit. The coolant passage is provided inside an engine body. The coolant pump is configured to cause the coolant to flow through the coolant passage. The pre-branching passage is communicated with an outlet side of the coolant passage, and communicated with the main circuit and the warm-up circuit. The coolant temperature sensor is configured to detect a coolant temperature inside the pre-branching passage. The agitator is disposed downstream of the coolant temperature sensor in a direction of coolant flow when the coolant pump is operating. The agitator is disposed at a boundary between the pre-branching passage and the main circuit or in a vicinity of the boundary.

Various methods and systems are provided for a thermal management system of an engine. A method for an engine may comprise adjusting an engine speed during an engine start event that includes an engine cranking activity from a first engine speed to a second engine speed, where the adjusting is based on a sensed oil temperature; adjusting a first resistance of a radiator primary return line of a thermal management system to a first resistance level; and adjusting the engine speed a duration after a start of the engine cranking from the second engine speed to a third engine speed, the third engine speed based at least in part on an engine torque demand, and selectively adjusting the first resistance between each of the first resistance level and a second resistance level based on the third engine speed, the second resistance level being lower than the first resistance level.

A cooling apparatus comprises a first cooling conduit branching off from a downstream side connection conduit to cool the cylinder head, a second cooling conduit branching off from the downstream side connection conduit, is provided in parallel with the first cooling conduit, an intermediate cooling conduit being connected to the first and second cooling conduits, is provided with an EGR cooler, a third cooling conduit running from a connection point of the intermediate cooling conduit and the first cooling conduit to an upstream side connection conduit, a fourth cooling conduit running from a connection point of the intermediate cooling conduit and the second cooling conduit to the upstream side connection conduit, and a changeover valve for adjusting the flow resistance of the second cooling conduit. And the direction of coolant flow in the intermediate cooling conduit is changed over by operating the changeover valve.

System, method, and apparatus for controlling circulation of fluid to, and evacuation of the fluid from, an external fluid circuit for heat transfer. A single control valve selectively stops the circulation of fluid from a supply passageway to an external fluid circuit and diverts fluid to a bypass passageway which creates a suction force at a venturi valve region therein. The venturi valve region includes a fluid jacket that encases at least a portion of the venturi valve region. A suction passageway couples the suction force of bypass passageway to either return passageway or supply passageway, for evacuating fluid from external fluid circuit. No more than a single suction passageway is required to be coupled to either supply passageway and/or return passageway. A return check valve disposed in return passageway prevents backflow of fluid through return passageway.