A cooling water passage structure includes a cooling water passage in an internal combustion engine, a water pump, and a communication member. The communication member has a cooling water communication passage to supply cooling water from the water pump to the cooling water passage. The cooling water communication passage includes a water pump housing, a first cooling water passage, and a second cooling water passage. The water pump housing contains the water pump. The first cooling water passage has a substantially triangular shape that widens from a vertex on an upstream side. The second cooling water passage includes a cylindrical passage extending in a direction orthogonal to an operating axis of the water pump. The second cooling water passage is displaced from an operating plane of the water pump.

A tractor-trailer truck engine coolant manifold comprises a first supply port for receiving coolant from an engine or radiator, and a first return port for returning coolant to the engine or radiator. The manifold also has a second supply port in fluid communication with the first supply port, and a second return port in fluid communication with the first return port. Further, the manifold can have a third supply port in fluid communication with the first supply port, and a third return port in fluid communication with the first return port. The coolant manifold can further have one or more internal flow paths that are configured so that coolant flow rate or pressure exiting one supply port is different from the coolant flow rate or pressure exiting from another supply port, pre-selected based upon the thermal requirements of the heat source or heat sink components.

A tractor-trailer truck engine coolant manifold comprises a first supply port for receiving coolant from an engine or radiator, and a first return port for returning coolant to the engine or radiator. The manifold also has a second supply port in fluid communication with the first supply port, and a second return port in fluid communication with the first return port. Further, the manifold can have a third supply port in fluid communication with the first supply port, and a third return port in fluid communication with the first return port. The coolant manifold can further have one or more internal flow paths that are configured so that coolant flow rate or pressure exiting one supply port is different from the coolant flow rate or pressure exiting from another supply port, pre-selected based upon the thermal requirements of the heat source or heat sink components.

A cooling system for a bus may include a heat dissipating plate mounted on a roof panel of a top of a bus and cooling heated fluid with wind, and an actuator connected to an air tank, selectively actuating the heat dissipating plate and adjusting an inclination angle between the heat dissipating plate and the roof panel.

A system for controlling an air flow rate into a vehicle engine room may include a fan shroud in which a cooling fan including a fan motor and a fan blade is mounted, a radial portion which is provided in the fan shroud while corresponding to an operation area of the fan blade, including a shutter hub positioned to a center thereof and a plurality of radial units disposed to the shutter hub and including a plurality of radial shutters selectively unfolded from the shutter hub to external circumference directions or selectively folded to the shutter hub direction, and a radial unit operating portion unfolding the plurality of radial units from the shutter hub to the external circumference directions or folding the plurality of radial units to the shutter hub direction.

A cooling system for an industrial vehicle includes one or more heat radiation devices located in a containment. The one or more heat radiation devices may be configured to cool a plurality of components in the industrial vehicle. An air intake device may be configured to create airflow from outside of the industrial vehicle into the containment. The airflow passes through the one or more heat radiation devices. The cooling system may further include a control device operatively connected to the containment. The control device may be configured to selectively direct at least a portion of the airflow to the plurality of components in the industrial vehicle after the airflow passes through the one or more heat radiation devices.

The present invention relates to an integrated cooling system for a vehicle. The system includes an engine cooling loop having a first fluid configured for circulation through an engine of the vehicle and a power electronics cooling loop having a second fluid configured for circulation through at least one power electronics component of the vehicle. The engine cooling loop is fluidly isolated from, and in thermal communication with, the power electronics cooling loop.

A learning unit learns a difference between a detected value ECT and a detected value RCT when it is determined that the detected value ECT and detected value RCT are stable while an engine is at a stop. A diagnostic unit performs a fault diagnosis for the engine based on the difference between the detected value ECT and detected value RCT having been corrected through use of a learned value learned by the learning unit. Accordingly, a fault diagnostic system for an internal combustion engine and a fault diagnostic method for an internal combustion engine can be achieved in which accuracy in fault diagnosis for the internal combustion engine can be improved and an erroneous diagnosis can be restrained.

The valve includes a housing, a thermostatic element, a first shutter displaced by the thermostatic element along an axis relative to a first seat integrated into the housing to control a flow of fluid between the first and second paths, a cage, a first return spring, a second shutter axially displaced by the thermostatic element relative to a second shutter axially displaced by the thermostatic element with respect to a second seat integrated into the cage, a third shutter axially displaced by the fluid overpressure in the second path relative to a third seat integral with the cage, and a second return spring. The cage includes a tubular part, which is centred on the axis and through the interior of which fluid flows between the second and third paths. An outer face of the tubular part is provided with a seal. The cage also includes arms.