Methods and systems are provided for a coolant system. In one example, a method may include diagnosing a condition of a pump of the coolant system based on a temperature change of coolant. The diagnostic may determine if the pump is stuck on or off.

To enhance responsivity of temperature sensor detecting an engine temperature. A temperature sensor component 40 includes a metal washer 42. The temperature sensor component 40 transfers the engine temperature to a sensor body 46 via the heat transfer washer 42. A cylinder portion 8 of a cylinder block 64 has two bosses 30. The washer 42 of the temperature sensor component 40 is fixed to the boss 30 together with the electronic control unit 20.

Methods and systems are provided for a coolant circuit. In one example, the coolant circuit comprises high and low-temperature radiators, where only one pump is configured to conduct coolant through the entire coolant circuit.

A method for operating a device at a desired temperature is described. In one example, current supplied to a heater that melts a wax medium or material controlling flow through a valve is adjusted to reduce valve opening and closing delay. The method may improve device temperature control, thereby reducing device emissions, enhancing device performance, and improving device durability.

An engine cooling system has a coolant control valve unit and includes a cylinder head disposed on a cylinder block. The coolant control valve unit is configured to receive coolant from a coolant outlet side of the cylinder head to control coolant distributed to a heater and a radiator and to control coolant exhausted from the cylinder block. A control unit is configured to determine a heating priority mode according to operation conditions and to substantially open a first coolant passage corresponding to the heater by controlling the coolant control valve unit in the heating priority mode.

Systems and methods are provided for management of a thermal system. A system for thermal management includes a thermal system with fluid conduits. A sensor is disposed to monitor an input parameter state of the thermal system. An actuator is configured to vary a flow in the fluid conduits. A controller is configured to receive a signal representative of the input parameter state; process an actuator state through a flow model of the thermal system to obtain an existing flow in the fluid conduits; process the existing flow through a thermal model of the thermal system to determine an input that reduces an error between a desired parameter state and the input parameter state; process the input through an inverse flow model to convert the input to a desired actuator state; and position the actuator in the desired actuator state.

The invention relates to a thermal management method for operating a thermal management system (100, 102) of an internal combustion engine (10). The thermal management system (100, 102) comprises at least one fluid chamber (12) which is arranged at least partially around a cylinder head (74) of a cylinder (70) of the internal combustion engine (10) and has at least one inlet line (14) and at least one outlet line (16), the fluid chamber (12) being connected to at least one coolant pumping device (20) for pumping a coolant, and to at least one heat sink. According to the invention, a cylinder head temperature sensor and/or a fluid chamber temperature sensor (58) is provided, a volume flow of the coolant delivery device (20) being controllable depending on an engine speed and/or a fluid chamber temperature and/or an engine load, in particular by actuation of at least the first valve (18). According to the thermal management method, when the temperature in the fluid chamber (12) rises, in particular after a warm-up phase and when the engine speed remains constant or drops, the volume flow of the coolant through the heat sink is at least temporarily increased, and when the engine speed remains constant or increases by no more than 100 rpm, with engine load being reduced, in particular by at least 30%, the volume flow of the coolant through the heat sink is not reduced, and in particular is not reduced after at least one minute following the load change, and more particularly is not reduced when a fluid chamber (12) temperature is in the 60 to 100° C. range.

An engine includes a block defining at least one cylinder and a cylinder head received on the block. The cylinder includes a casting defining an exhaust port in fluid communication with the cylinder and an integrated exhaust manifold. The integrated exhaust manifold has an exhaust runner defined by the casting and extending from the exhaust port to an outlet defined on an outer surface of the casting. The casting includes a protrusion extending into the exhaust runner such that a raised dimple is disposed on a sidewall of the exhaust runner. The casting further defines a sensor bore extending towards the protrusion such that the sensor bore and the protrusion have a common centerline. A temperature sensor is disposed in the sensor bore and has a sensing element arranged in proximity to the protrusion such that the sensing element reads a temperature of the protrusion.

An engine cooling device has a mechanical water pump, a flow rate control valve having a valve body of which a relative rotational position is changed by a motor, and a control unit that performs drive control of the motor to change the relative rotational position of the valve body to a target relative rotational position. The control unit performs protection control for setting the relative rotational position where a withstanding pressure limit rotational speed is equal to or higher than a current engine rotational speed, as a target operating position of the valve body of the flow rate control valve when the engine rotational speed rises, and performs retreat control for reducing a set range of the target relative rotational position to a prescribed retreat operation range when the supply voltage of the in-vehicle electric power supply has dropped.

Methods and systems are provided for a coolant system coupled to cylinders in a locomotive engine. In one example, a coolant system coupled to an individual cylinder may include a cylinder liner jacket encircling the cylinder, a cylinder head lower coolant jacket surrounding a lower surface of a cylinder head placed over the cylinder, a cylinder head upper coolant jacket surrounding an upper surface of the cylinder head, and a cylinder head exhaust port cooling jacket surrounding an exhaust port of the cylinder. Coolant may flow to each of the cooling jackets from a coolant feed gallery located in the engine crankcase, and after flowing through the engine, the coolant may return to a coolant return gallery also located in the engine crankcase.