Examples of techniques for controlling a cooling system for an internal combustion engine using feedback linearization are provided. In one example implementation, a computer-implemented method includes receiving, by a processing device, desired temperature targets. The method further includes receiving, by the processing device, temperature feedbacks. The method further includes calculating, by the processing device, a desired temperature derivative for each of the desired temperature targets. The method further includes calculating, by the processing device, desired coolant flows from the desired temperature derivative for each of the desired temperature targets using feedback linearization. The method further includes calculating, by the processing device, actuator commands from the desired coolant flows using an inverted hydraulic model. The method further includes implementing, by the processing device, the actuator commands in actuators in the cooling system.

There is provided a straddle-type vehicle. A water jacket is configured to cool an engine by cooling water discharged from a water pump. A radiator is arranged in front of the engine. A cooling water stream control unit is configured to control a flow rate of the cooling water to circulate in the radiator, based on a temperature of the cooling water after cooling the engine. The water pump is mounted to a part of a crankcase at one side in a right and left direction of the straddle-type vehicle. The cooling water stream control unit is arranged at a position that is located at the one side of a center of the straddle-type vehicle in the right and left direction, is lower than a cylinder head cover and is located between the engine and the radiator, when seeing the straddle-type vehicle from a side.

A two-stroke engine comprises a first oiling system and a second oiling system. The first oiling system includes a low-pressure pump that distributes oil from a first oil tank to the two-stroke engine. The second oiling system includes a pump mechanically coupled to a crankshaft of the two-stroke engine, wherein the pump distributes oil from a second oil tank to an accessory at a pressure greater than the first oil pressure, wherein oil distributed to the accessory is returned to the second oil tank.

A cooling apparatus of an internal combustion engine of a water-cooled motor vehicle includes a cooling fan is controlled by the driveshaft faced to a radiator protected by a louver arranged on a side of the vehicle and receiving a substantially tangential air flow, allows improved air penetration through the radiator, the louver having: at least a current rib, parallel to the outer face of the radiator, extending in a direction concurrent with the motion direction, intermediate between the lower and top fastening edges further spaced-apart with respect thereto from the radiator with a C-like section, determining a space between louver and radiator deviating the motion of the air sucked by the fan; and a plurality of blades extending on both sides of the current rib, transversal to the motion direction of the motor vehicle, having a front leading edge, further spaced-apart from the radiator than the respective rear edge.

A straddle-type vehicle includes a radiator; an engine; and a passage which is provided inside the cylinder block and the cylinder head, flows a coolant from the cylinder head toward the cylinder block, and is provided with an inlet located on a rear side of the cylinder head; a pipe which flows the coolant from the radiator toward the passage, and flows the coolant from an outlet toward the radiator; and a thermostat which limits a flow of the coolant inside the pipe in a case where a temperature of the coolant is equal to or lower than a predetermined temperature, and permits the flow of the coolant in a case where the temperature is higher than the predetermined temperature, wherein the outlet is provided on a front side of the cylinder block and the thermostat is attached on a front portion of the engine.

Disclosed is an engine temperature regulating device installed to a cool air inlet of a casing of an engine. The engine temperature regulating device includes a power source, a link rod module connected to the power source, a control module and a fan cover module including a fixed casing and a movable casing. The control module is provided for detecting a temperature when the engine is turned on to control the power source to drive the link rod module, so as to control the rotation of the connected movable casing and further adjust an air intake hole of the fixed casing to a smooth or obscured state.

There is provided a saddle-ridden type vehicle including an engine, a water pump, and a radiator. A cooling water flow control unit switches a first circulation path without flowing in the radiator, and a second circulation path through the radiator, in accordance with a temperature of cooling water. The cooling water flow control unit includes a thermostat and a thermostat housing. The thermostat housing is formed with a first passage, a second passage disposed adjacent to the first passage, and a bypass passage communicating the first passage and the second passage. The thermostat switches communication and cutoff of the second passage at a part of the second passage, which is positioned upstream of a connection part between the second passage and the bypass passage, in accordance with the temperature of the cooling water.

A two-stroke engine comprises a first oiling system and a second oiling system. The first oiling system includes a low-pressure pump that distributes oil from a first oil tank to the two-stroke engine. The second oiling system includes a pump mechanically coupled to a crankshaft of the two-stroke engine, wherein the pump distributes oil from a second oil tank to an accessory at a pressure greater than the first oil pressure, wherein oil distributed to the accessory is returned to the second oil tank.

A cooling system includes a rear radiator that is mounted in a vehicle and circulates cooling water to release heat of the cooling water. A fan that generates cooling air to cool the rear radiator, and a shroud is provided between the fan and the rear radiator and guides the cooling air. The shroud has a double structure having an internal space; the internal space enables the cooling water to pass through the internal space when the cooling water circulates.

A device and method for cooling an air cooled motorcycle engine. A fan and a cover acting as a duct directs engine heat forward away from a rider when the motorcycle engine is hot and the motorcycle is stopped. When the motorcycle is in motion the fan is switched off and the passing air takes a reversed path and flows rearward over the engine fins cooling the engine.