Abstract: The present invention relates to an adjustable electronic thermostat valve comprising an actuating means provided with a rod for stroking a chamber of an expendable thermal element, so that temperature at which the thermostat valve opens can be easily adjustable based on driving condition of an automobile by changing the volume of the chamber of the expendable thermal element, whereby a cooling efficiency of the engine is maintained in optimized range. As a result, emission of exhaust gas and consumption of fuel is significantly reduced.

Abstract: A valve for regulating fluid flow and associated method of use. The valve includes a stepper motor, a first valve chamber having an inlet port, a second valve chamber having an outlet port, wherein the first valve chamber includes an opening between the first valve chamber and the second valve chamber, a first member that is rotatable and operatively attached to the stepper motor, a second member that engages the first member for linear movement of the second member between a first position and a second position when the first member is rotated by the stepper motor, and a sealing mechanism that is operatively attached to the second member, wherein the sealing mechanism can move adjacent to the opening when the second member is in the first position and the sealing mechanism can move away from the opening when the second member is in the second position.

Abstract: A U flow radiator 10 with a header tank 12 split into inlet and outlet sides I and O by a lengthwise divider wall 18 has a coolant inlet consisting of a cylindrical pipe 22. A hollow cylindrical barrel 24 co extensive and coaxial with pipe 22 and extending across divider wall 18, with cut outs 26 and 28 opening respectively into both sides I and O. A thin walled, hollow cylindrical sleeve 30 turns within barrel 24 with windows 36 and 38 that alternately block or open the cut outs 26 and 28, or open both partially. A rotary actuator 40 turns sleeve 30 within barrel 24. Coolant can be selectively routed all to the tank outlet side O, by passing the radiator 10 for quick warm up. After warm up, coolant can be routed to I or O in desired proportions to increase or decrease cooling capacity. With high engine cooling demand, all coolant is routed to the inlet side I and all coolant passes through radiator 10.

Abstract: A coolant circuit (10) includes at least one heat source (12), a radiator (14), and a bypass line (22), which connects a radiator inlet (18) to a radiator return (20) and whose junction (24) has a control valve (26) disposed on it, whose throttle body (58) can be electrically triggered as a function of operating parameters and environmental parameters by means of at least one control unit (40, 42) and divides the coolant flow between the radiator inlet (18) and the bypass line (22). According to a characteristic curve of the control valve (26), the control unit (40, 42) determines a set-point value (50) for the position of the throttle body (58), which sets a ratio of the radiator volume flow to the total coolant flow at the control valve (26).

Abstract: A constructive arrangement applied to an integrated thermostatic valve attached to its own housing has a hollow tubular-shaped body (1) projecting from a flange (2) with holes (3) for fixing screws, and a central opening (4) that determines the chamber mouth molded to the cavity of the body. There are two opposing lengthwise projections (6), which have a groove (7) near the chamber mouth, and another groove (8) near the mouth of the body (1), with the ends of a curved plate (9) fitted into the grooves (8). In the grooves (7) are fitted the ends of another plate (11). A sheet metal disk (12) is inserted into the internal rim of the mouth (4) of the chamber (5), having fixed to the end of the thermostatic valve, a washer (14) for supporting the disk (15) that has a hole where the terminal of the aforementioned thermostatic valve is housed and moves.

Abstract: A thermal flow control valve uses a cylindrical valve sleeve in a stepped bore to regulate fluid flow between an inlet and an outlet. A wax filled actuator is coupled to the valve sleeve to move the sleeve from an open position in which radial flow openings in the sleeve communicate with a larger diameter portion of the stepped bore to a closed position in which the radial flow openings are closed by a sleeve chamber closely surrounding the sleeve. A flow-through end cap closes one end of the stepped bore and provides an axially aligned fixed stop for the actuator piston. Two-way, three-way and mixing embodiments of the valve are disclosed.

Abstract: An object of the present invention is to provide a thermostat device which enables a valve body to operate with stability, which can prevent overshoot and hunting, and in which the size of the thermostat device itself can be reduced. A first valve body and a second valve body are removably supported on a main shaft which is supported by the distal end of a piston of a thermo-element which causes the first valve body and second valve body to open and close by sensing the temperature of cooling water, and a temperature sensing section of said thermo-element is disposed so as to sense cooling water temperature by contacting only the cooling water from the engine outlet side without directly contacting the cooling water from the radiator outlet side.

Abstract: A valve assembly for automatically and proportionally controlling the flow of coolant fluid between an engine and a radiator for cooling the fluid heated by the engine in response to changes in the fluid temperature within a predetermined temperature range. The valve assembly includes a housing having a fluid chamber extending between opposing first and second ends. A radiator port extends between the radiator and the first end of the chamber. A bypass port extends between the engine outlet and the chamber. An engine port extends between the engine inlet and the chamber. A main valve is slidably received within the chamber for movement in and out of engagement with the first end of the chamber for closing and opening fluid flow between the radiator and the chamber. A secondary valve is slidably received within the chamber for movement with the main valve in and out of engagement with the first end of the chamber for opening and closing fluid flow between the bypass port and the chamber.

Abstract: A thermostat comprises a valve and an electric valve actuator to move the valve against a valve seat. The thermostat comprises a wax motor responsive to temperature to move the valve away from the valve seat.

Abstract: Expansion or elastic material working element, particularly for operating a thermostatic valve, having a housing and a movable working pin led out of the housing, the housing containing expansion material and a heating device with an electrical resistance element applied to a support. More particularly for increasing the response speed of such a device, according to the invention the support has a cavity and the resistance heating element is a heating conductor wound around the support.

Abstract: A valve for automatically and proportionally adjusting fluid flow between an engine and a radiator for cooling the fluid heated by the engine in response to changes in fluid temperature within a range of operating temperatures. The valve includes a housing having a chamber. The housing includes a radiator flow port for passing fluid between the radiator and the chamber, a bypass flow port for passing fluid between the engine and the chamber, and an engine flow port for passing fluid between the chamber and the engine. A vane disposed in the chamber has a vane wall engagable with both the radiator and bypass fluid ports for restricting fluid flow through the radiator and bypass fluid ports. The vane is pivotally coupled to the housing for movement between the radiator and bypass fluid ports. A drive assembly is operatively coupled to the vane for varying the position of the vane within the chamber.

Abstract: A valve actuating mechanism for a transmission/engine fluid cooler bypass valve of the type in which a responsive element expands to urge a valve member against a valve seat and thereby causes transmission fluid to flow through an oil fluid cooler. A cast valve housing is utilized which is interposed between the cooler and the oil source. The valve actuating mechanism is designed to allow fluid to pass through the valve once the fluid has reached an elevated temperature.

Abstract: A control to enable a further degree of enhancement in combustion efficiency in an automobile by effectively performing temperature control of cooling water in an automobile engine in accordance with various states of operation. Parameters from a variety of sensors that detect the state of an automobile engine are input into an engine control unit. Then, when the engine control unit determines from values of the accelerator opening and engine rotation speed, which serve as parameters indicating the operating state of the automobile, that the engine load is about to decrease, control is performed in the electronic control thermostat to maintain the cooling water temperature at a high temperature. Conversely, when it is determined that medium or high loads are due to increase, the control method is switched such that the electronic control thermostat is controlled by reading a target temperature corresponding to these parameter values from the engine control unit.

Abstract: A regulating valve for a heat-transferring medium has a valve member controllable primarily by an electrical actuating member, but in the event of failure of the electrical actuating member, a thermostatic actuating member, operating independently of the electrical actuating member and of electric power, is provided in order to prevent damage to the system by driving the valve member when a predetermined temperature is exceeded.

Abstract: A valve assembly for automatically and proportionally controlling the flow of coolant fluid between an engine and a radiator for cooling the fluid heated by the engine in response to changes in the fluid temperature within a predetermined temperature range. The valve assembly includes a housing having a fluid chamber extending between opposing first and second ends: A radiator port extends between the radiator and the first end of the chamber. A bypass port extends between the engine outlet and the chamber. An engine port extends between the engine inlet and the chamber. A main valve is slidably received within the chamber for movement in and out of engagement with the first end of the chamber for closing and opening fluid flow between the radiator and the chamber. A secondary valve is slidably received within the chamber for movement with the main valve in and out of engagement with the first end of the chamber for opening and closing fluid flow between the bypass port and the chamber.

Abstract: A plastic thermostat housing having a vent passage including a valve portion (46), a cap portion (48), and an outlet portion (54), with the cap portion (48) being larger in cross sectional area than the cap, portion (48). A check valve (52) is inserted into the valve portion (46) and a cap (50) with a vent hole (56) is inserted into the cap portion (48) for retaining the check valve (52) in the vent passage. The assembly is characterized by the plastic material of the housing (12) being deformed into engagement with the cap (50) for retaining the cap (50) in the valve portion (48) of the vent passage. The cap (50) may comprise a plastic material to be fused to the housing (12).

Abstract: A flow control valve is located in a coolant circuit that extends through an engine. The flow control valve is operated in accordance with a control mode selected from a full closing control mode, a full opening control mode, and a feedback control mode. When switching from one control mode to another, the flow control valve is controlled in accordance with a transitional control procedure selected from different types of transitional control procedures. The transitional control procedure to be performed is selected depending on which control modes are performed before and after the control mode switching and/or the current condition of the engine. Transitional controlling of the flow control valve is thus appropriately conducted.

Abstract: An object of the present invention is to provide a thermostat device which enables a valve body to operate with stability, which can prevent overshoot and hunting, and in which the size of the thermostat device itself can be reduced. A first valve body and a second valve body are removably supported on a main shaft which is supported by the distal end of a piston of a thermo-element which causes the first valve body and second valve body to open and close by sensing the temperature of cooling water, and a temperature sensing section of said thermo-element is disposed so as to sense cooling water temperature by contacting only the cooling water from the engine outlet side without directly contacting the cooling water from the radiator outlet side.

Abstract: The present invention relates to an adjustable electronic thermostat valve comprising an actuating means provided with a rod for stroking a chamber of an expendable thermal element, so that temperature at which the thermostat valve opens can be easily adjustable based on driving condition of an automobile by changing the volume of the chamber of the expendable thermal element, whereby a cooling efficiency of the engine is maintained in optimized range. As a result, emission of exhaust gas and consumption of fuel is significantly reduced.

Abstract: The present invention relates to a method of controlling an electronic thermostat valve that is based on the driving conditions. The method includes using controlling parameters memorized in an ECU (Electronic Control Unit). A power source to activate the thermostat valve is originated from an expanding force of a thermal element and a change of stroke of an actuating means. A cooling system of a vehicle can be maintained in an optimized state such that fuel consumption and exhaust pollutants are reduced.

Abstract: A valve actuating mechanism for a transmission/engine fluid cooler bypass valve of the type in which a responsive element expands to urge a valve member against a valve seat and thereby causes transmission fluid to flow through an oil fluid cooler. A cast valve housing is utilized which is interposed between the cooler and the oil source. The valve actuating mechanism is designed to allow fluid to pass through the valve once the fluid has reached an elevated temperature.

Abstract: A bypass valve assembly, comprising: (a) a housing 12 having an inlet 16 and an outlet 18; (b) a valve member 20 disposed within the housing and being movable between a closed position and an open position; and (c) a slug of material 30 disposed in an initial substantially solid phase in contact with the valve member 20 so as to maintain the valve member in the closed position. The slug of material 30 is subsequently heatable into a substantially softened phase so as to permit the valve member 20 to move into the open position.

Abstract: Provided is a thermostat device enabling stable valve element operation and capable of preventing overshoots and hunting, and which enables the miniaturization of the thermostat device itself. Inside the housing of a bottom bypass-type thermostat device comprising a main valve element on the main body and a bypass valve element on the bottom side, the main valve element and bypass valve element are supported by a main shaft supported at the piston tip of a thermoelement, the temperature sensor of the thermoelement is disposed on the main shaft such that it does not directly contact the cooling water from the radiator outlet and senses the temperature by contacting a portion of the cooling water from the engine outlet, and the temperature sensor is equipped with a heating element.

Abstract: A thermostatic valve contains a hollow cylindrical valve element, each of whose two ends form an inlet port for hot or cold water. The mixed water formed by mixing hot and cold water strikes a temperature sensor which, as a function of the temperature, displaces the valve element to a greater or lesser extent. Within the valve element is located a mixing device, which divides the inflowing hot water into several flows, namely two radially directed flows and an axial flow flowing round the end of a sleeve. The radial parts of the hot water flow are encountered by an axial cold water flow. This leads to a particularly intimate mixing of hot and cold water before the temperature sensor is reached.

Abstract: A compressor system includes a fluid system having a cooler and a valve. The valve includes a housing and a spool disposed within the housing. The spool has a temperature sensitive wax cartridge, and is movable between an actuated position and a non-actuated position. When the spool is in the actuated position, inlet fluid flow enters the valve through an inlet port, exits the valve through the cooler port, flows through the cooler, reenters the valve through the cooler return, flows over the wax cartridge, and exits the valve through the outlet port. When the spool is in the non-actuated position, the inlet fluid flow bypasses the cooler, flows through the valve and over the wax cartridge, and exits the valve through the outlet port. The wax cartridge only senses the temperature of the inlet fluid flow when the spool is in the non-actuated position.

Abstract: An improved thermostatic valve has an axially open annular slide and a base plate which together form a gasket seat, and has a restoring spring, which biases the annular slide in the direction toward the base plate. The restoring spring is mounted upon an abutment that is connected to the base plate instead of to the valve housing. The configuration of the claimed invention permits a thermostatic valve that may be assembled and tested prior to installation on an internal combustion engine.

Abstract: A flow control valve is located in a coolant circuit that extends through an engine. The flow control valve is operated in accordance with a control mode selected from a full closing control mode, a full opening control mode, and a feedback control mode. When switching from one control mode to another, the flow control valve is controlled in accordance with a transitional control procedure selected from different types of transitional control procedures. The transitional control procedure to be performed is selected depending on which control modes are performed before and after the control mode switching and/or the current condition of the engine. Transitional controlling of the flow control valve is thus appropriately conducted.

Abstract: The present invention provides a cartridge thermostat system that permits removal and replacement of the thermostat without removing the housing or coolant manifold. In the cartridge thermostat system, a coolant manifold is mounted on a cylinder head of an engine. The cylinder head has an engine by-pass and a coolant port for receiving a pilot on the coolant manifold. The coolant manifold further comprises at least one thermostat port with an associated cartridge thermostat and at least one passage for appropriate coolant flow. The cartridge thermostat fastens to the thermostat port and operatively positions a plug to an engine by-pass and a sleeve to a coolant passage. A wax plug in the cartridge thermostat expands when the coolant is hot and thereby appropriately and simultaneously positions the plug relative to the engine by-pass and the sleeve relative to the coolant passage.

Abstract: The invention relates to a valve-type device including a housing having a fluid access (7) which is shut off by a shutter (9) secured to an actuator (10) as a function of the temperature of the fluid passing through the device. The device also includes an expanding-material safety thermostatic element (22) located in the stream of fluid passing through the housing. The element 22 actuates the shutter (9) when, as a result of defective operation of the actuator (10) or of its control equipment, the shutter has not been moved by the actuator. The actuator also consists of an expanding-material thermostatic element containing a heating means (13) connected to control equipment.

Abstract: A valve actuating mechanism for a transmission/engine fluid cooler bypass valve of the type in which a responsive element expands to urge a valve member against a valve seat thereby causes transmission fluid to flow through an oil fluid cooler. A cast valve housing is utilized which is interposed between the cooler and the oil source. The valve actuating mechanism is designed to allow fluid pass through the valve once the fluid has reached an elevated temperature.

Abstract: The invention is based on a coolant circuit (10) with at least one heat source (12), a radiator (14), and a bypass line (22), which connects a radiator inlet (18) to a radiator return (20) and whose junction (24) has a control valve (26) disposed in it, whose throttle body (58) can be electrically triggered as a function of operating parameters and environmental parameters by means of at least one control unit (40, 42) and divides the coolant flow between the radiator inlet (18) and the bypass line (22).

Abstract: The present invention provides a cartridge thermostat system that permits removal and replacement of the thermostat without removing the housing or coolant manifold. In the cartridge thermostat system, a coolant manifold is mounted on a cylinder head of an engine. The cylinder head has an engine by-pass and a coolant port for receiving a pilot on the coolant manifold. The coolant manifold further comprises at least one thermostat port with an associated cartridge thermostat and at least one passage for appropriate coolant flow. The cartridge thermostat fastens to the thermostat port and operatively positions a plug to an engine by-pass and a sleeve to a coolant passage. A wax plug in the cartridge thermostat expands when the coolant is hot and thereby appropriately and simultaneously positions the plug relative to the engine by-pass and the sleeve relative to the coolant passage.

Abstract: A method for detecting errors in a motor vehicle engine cooling system is proposed according to the invention, in which an algorithm is used to not only detect an error in the cooling system, but to also determine whether the thermostat valve or the temperature sensor are defective. Differentiated error detection is achieved in that a second temperature model band is calculated for the case in which the thermostat remains in the opened state. A first temperature model band is calculated for the case in which the cooling system is in order. By comparing the course of the curve for the measured actual temperature with the two temperature model bands, a selective diagnosis can be carried out and determine whether the temperature sensor or the thermostat valve is defective. No additional hardware expenditures are required.

Abstract: A thermostat cartridge assembly 14 for a cooling system 10 of an automotive vehicle 12 including a housing 50. The housing 50 includes a first opening 62, a second opening 68, and a direct-flow opening 72. A thermostat mechanism 80 located at least partially within the housing 50 adjusts the amount of coolant flowing between the first opening 62, the second opening 68, and the direct-flow opening 72. An attachment mechanism 52 attaches the thermostat cartridge assembly 14 to the cooling system 10. A releasing mechanism 54 engages and disengages the thermostat cartridge assembly 14 to and from the cooling system 10.

Abstract: A device, which can be used in the cooling circuits of internal combustion engines comprises a chamber (3) having at least three ports (4, 5, 6) two of which can be closed off by valves (9, 10) carried by a main thermostatic element (7) housed partially in the chamber. One valve moves away from its seat when the other moves towards its own seat. A pipe (1) entering the chamber (3) via one of the two seats contains a thermostatic threshold-setting element (17) carrying a moveable compensator (21) provided with a moveable stop (16) for the main thermostatic element (7). The thermostatic setting element (17) has an electrical heater which can be connected to an electrical power supply that can be selectively activated and deactivated in order, when deactivated, to decrease the distance between the stop (16) and the seat (14) in the pipe and thus the temperature for which this seat is released.

Abstract: A controller provided in accordance with the invention determines a failure of a thermostat that opens and closes a passage through which cooling water circulates between a radiator and an engine. The controller prohibits the failure determination if a water temperature of the engine decreases by more than a predetermined amount during a predetermined period from the time when a rotational speed of the engine exceeds a predetermined rotational speed. Thus, when the thermostat opens due to a high rotational speed of the engine, the failure determination is prohibited. Therefore, it is avoided that the thermostat operating normally is judged to be faulty.

Abstract: A thermostat 1 which placed in a cooling fluid channel of an internal combustion engine and which controls the flow of a cooling fluid within the cooling fluid channel depending upon a change in the temperature is disclosed.

Abstract: The present invention provides a cartridge thermostat system that permits removal and replacement of the thermostat without removing the housing or coolant manifold. In the cartridge thermostat system, a coolant manifold is mounted on a cylinder head of an engine. The cylinder head has an engine by-pass and a coolant port for receiving a pilot on the coolant manifold. The coolant manifold further comprises at least one thermostat port with an associated cartridge thermostat and at least one passage for appropriate coolant flow. The cartridge thermostat fastens to the thermostat port and operatively positions a plug to an engine by-pass and a sleeve to a coolant passage. A wax plug in the cartridge thermostat expands when the coolant is hot and thereby appropriately and simultaneously positions the plug relative to the engine by-pass and the sleeve relative to the coolant passage.

Abstract: A thermostatic device comprises a chamber with ports, at least one of which can be closed off by a valve carried by a moving part of a metering thermostatic element. In order to obtain two reliable levels of regulation, and to maintain regulation unless the device is completely destroyed, a duct opening into the chamber via a seat for the valve contains at least one region of a thermostatic element for adjusting the regulation threshold containing selectively operated heating means and comprises a stop for the thermostatic element. The stop can itself move in the direction of movement of the moving part so as to move closer to the seat when the heating means are switched on.

Abstract: The invention relates to a closing cap (10) for the fixed tubing of a motor vehicle radiator, comprising an inner part (14) with a flow connection means between the inside and the outside of the container, as well as a distributing mechanism for freeing and closing the flow connection means. A valve body (22) of the distributing mechanism (11), which can be reciprocated, is compressed under pre-stress towards the inside of the container against a sealing seat (21) at the inner part (14) of the cap, so that said valve body can be lifted from said sealing seat (21) when a threshold value of the pressure inside the container is exceeded.

Abstract: An improved thermostatic valve has an axially open annular slide and a base plate which together form a gasket seat, and has a restoring spring, which biases the annular slide in the direction toward the base plate. The restoring spring is mounted upon an abutment that is connected to the base plate instead of to the valve housing. The configuration of the claimed invention permits a thermostatic valve that may be assembled and tested prior to installation on an internal combustion engine.

Abstract: A thermostatic valve contains a hollow cylindrical valve element, each of whose two ends form an inlet port for hot or cold water. The mixed water formed by mixing hot and cold water strikes a temperature sensor which, as a function of the temperature, displaces the valve element to a greater or lesser extent.

Abstract: A thermostatic valve for an internal combustion engine cooling system comprises a valve housing, a temperature-sensitive operating element, and a closure member adjustably movable by the operating element. The valve housing comprises a radiator connection opening, an engine connection opening, and a auxiliary connection opening, and defines a radiator coolant flow path between the radiator connection opening and the auxiliary connection opening, a short circuit coolant flow path between the engine connection opening and the auxiliary connection opening. Each of the radiator and short circuit coolant flow paths pass around the operating element. The closure member is movable to a first position wherein the radiator connection opening is interrupted and the engine connection opening is opened and to a second position wherein the radiator connection opening is opened and the engine connection opening is interrupted.

Abstract: A fitting construction of the thermostat 1, having a valve body 12 which actuates by the function of a piston portion 11, 15, 15a, 16 and a spring portion 6 depending upon a temperature change in the cooling fluid to cross said fluid channel FA, and which blocks or communicates the fluid channel by the movement is disclosed. The construction has a valve body 17 possessing an insert hole 5a into which the valve body 17 is inserted, an alignment groove 2b formed along the direction of the insertion of the valve body 17, projection 17g is placed on the circumference surface of the valve body 17, which is engaged with the alignment groove 2b, and which can slide along the alignment groove 2b, and a cover 19 which is screwed from the hole opening 2a onto the insert hole 5a, and which pushes and supports the valve body 17 at the end thereof. By having such a construction, there is no need for enlarging the diameter of the pipe, making it possible to moderate the restrictions of the thermostat placement.

Abstract: A thermostat assembly with a valve mounted to a carrier for installation in an engine thermostat housing. The carrier includes a body portion to which the valve is mounted. A pair of posts extend upward from the body portion and have snap tabs that seat in an annular groove in the thermostat housing. A handle extends from the side posts and includes legs that first project inward from the side posts and then upward to upper distal ends where a cross member connects the legs. The carrier is made of plastic such that when the legs are squeezed together, the side posts deflect to withdraw the snap tabs from the groove to withdraw the snap tabs and enable the carrier to be removed from the housing. The housing also includes an inwardly tapered portion that engages the body portion of the carrier to form a seal therebetween. Fluid pressure when the valve is closed deflects the carrier outward into firm engagement with the condiut.

Abstract: A housing has a chamber comprising fluid accesses, at least one of which can be plugged by a plug; a reversible motor equipped with a rotary shaft is connected to the plug by a coupling involving a screw-nut system to move it in translation towards plugging or uncovering the pluggable access according to the temperature of a stream of fluid travelling through the device; and a thermostatic element located in the same stream of fluid actuates the plug if the motor or its controls fail. In order to prevent the plug from then reverting to its initial position when the element retracts, the coupling is inelastic and the screw-nut system is reversible so that when the plug is actuated by the thermostatic element, the motor is made to rotate.

Abstract: Method and apparatus for heating gases cooled by an aftercooler that receives hot gases from a compressor. The method includes the steps of directing at least a portion of said hot gases to means for bypassing the aftercooler, and using the bypass means to direct hot gases to a location that receives cooled gases from the aftercooler. The hot gases are used at the location to heat the cooled gases when ambient temperature is at or below freezing, and are used downstream from the aftercooler when moisture freezes in the aftercooler.

Abstract: A thermostatic device comprises a chamber with ports, at least one of which can be closed off by a valve carried by a moving part of a metering thermostatic element. In order to obtain two reliable levels of regulation, and to maintain regulation unless the device is completely destroyed, a duct opening into the chamber via a seat for the valve contains at least one region of a thermostatic element for adjusting the regulation threshold containing selectively operated heating means and comprising a stop for the thermostatic element, which stop can itself move in the direction of movement of the said moving part so as to move closer to the seat when the heating means are switched on. The device can be used in combustion engine cooling circuits.

Abstract: In a disclosed diagnostic apparatus and a diagnostic method of a coolant temperature sensor, a time point when a predetermined time is elapsed after an engine started or when a predetermined heat amount is generated in the engine after the engine started is set as a measuring timing. A variation amount of output of the coolant temperature sensor from the start of the engine to the measuring timing is calculated, and it is judged that a trouble occurs in the coolant temperature sensor when the variation amount is smaller than a predetermined value. The apparatus and the method are preferably applied to diagnosis of a cooling apparatus comprising a cooling section for carrying off heat of the engine by coolant to cool the engine, a radiator for radiating the heat carried off by the coolant, and a thermostat for controlling a flow rate of the coolant which circulates via the cooling section and the radiator.

Abstract: The device comprises a chamber (3) having at least three ports (4, 5, 6) two of which can be closed off by valves (9, 10) carried by a main thermostatic element (7) housed partially in the chamber, one valve moving away from its seat when the other moves towards its own seat.