Apparatus and method for controlling a temperature of a vehicle component by means of air guide means

Abstract

An apparatus, for controlling a temperature of a vehicle component, such as of an internal combustion engine, by way of a cooling apparatus of the vehicle, includes a displaceable air guide, an actuator, a temperature sensor and a control unit. The control device is adapted so that a partially open air guide protection position is set at least temporarily below an external temperature threshold value for providing a frost warning. A related method is also disclosed.

Claims

1. A method for controlling a temperature of a vehicle component, comprising: checking whether an external temperature lies below an external temperature threshold value; outputting a control instruction to open an air guide when the external temperature falls below the external temperature threshold value; checking, after the control instruction to open the air guide has been output, whether the air guide is set in accordance with a setpoint value; when the air guide is set in accordance with a setpoint value, repeating the checking process after a defined cycle time; and when the air guide is not set in accordance with a setpoint value, repeating a deicing process until it is successful or a maximum value for attempts is reached, wherein the deicing process includes directing a frost protection agent onto the air guide to melt ice and snow and unblock the air guide.

2. An apparatus for controlling a temperature of a vehicle component, comprising: a displaceable air guide configured to control a cooling air stream; an actuator configured to displace the displaceable air guide; a temperature sensor for measuring an external temperature; a control unit configured to compare the external temperature to an external temperature threshold value for providing a frost warning and, in response to the external temperature falling below the external temperature threshold value, set said displaceable air guide into a partially open air guide protection position so that a minimum level of air cooling is ensured; and an anti-icing unblocking unit adapted to melt ice and snow and unblock the displaceable air guide, wherein the anti-icing unblocking unit includes a pump and at least one nozzle to direct a frost protection agent onto the displaceable air guide, or the anti-icing unblocking unit includes at least one of an electrical heating element integrated into the displaceable air guide and a heating duct carried on the displaceable air guide and a heating agent flowing through the heating duct.

3. The apparatus of claim 2, wherein said external temperature threshold value lies at 0° C. to +3° C.

4. The apparatus of claim 3, further including a blocking detection sensor adapted for detecting a blocked state of the displaceable air guide.

5. The apparatus of claim 4, wherein said control unit is configured to control operation of said anti-icing unblocking unit.

6. The apparatus of claim 5, wherein said control unit is configured to test the air guide for a blocking state by displacing said air guide between an open position and a closed position when the external temperature is below the external temperature threshold value.

7. The apparatus of claim 6, wherein the blocking detection sensor is a torque sensor.

8. An apparatus for controlling a temperature of a vehicle component by way of a cooling apparatus of the vehicle, comprising: at least one moving air guide that controls a size of at least one air inlet opening and a flow of a cooling air stream to the cooling apparatus; an actuator adapted for displacing the at least one moving air guide; a control device including an electrical control unit connected to a temperature sensor measuring an external temperature, said control device being adapted for (a) comparing a measured external temperature to an external temperature threshold value and (b) setting the at least one moving air guide into a partially open air guide protection position in response to the measured external temperature falling below the external temperature threshold, whereby air cooling is reduced but a minimum level of cooling is ensured; and a blocking detection sensor adapted to detect a blocked state of the at least one moving air guide.

9. The apparatus as claimed in claim 8, wherein the control device is adapted so that a corresponding protection position setting for the air guide, which is designed in particular as at least one slat or as at least one flap, is active in a parking mode of the vehicle.

10. The apparatus as claimed in claim 8, wherein the external temperature threshold value lies at 0° C. to +3° C.

11. The apparatus as claimed in claim 8, wherein the external temperature threshold value lies at +1° C.

12. The apparatus as claimed in claim 8, wherein the blocking detection sensor is a torque sensor.

13. The apparatus as claimed in claim 8, comprising an anti-icing unblocking unit adapted to release a blocked air guide by an anti-freeze agent deicing process and/or by a heating process.

14. The apparatus as claimed in claim 13, wherein the control device is adapted to cyclically test to check for a blocking state, preferably only below the temperature threshold value, by being opened and closed by the actuator in order to detect a blocking state of the air guide.

15. The apparatus as claimed in claim 14, wherein the air guide protection position comprises a 20%- to 40%-open state of the air guide.

16. The apparatus as claimed in claim 15, wherein the cooling apparatus is formed as a liquid radiator, and wherein the vehicle component to be cooled is an internal combustion engine of a motor vehicle.

17. A method using an apparatus as claimed in claim 8, wherein a partially open air guide protection position is set at least temporarily below an external temperature threshold value.

18. The apparatus of claim 8, comprising an anti-icing unblocking unit adapted to melt ice and snow and unblock the at least one moving air guide, wherein the anti-icing unit includes a pump and at least one nozzle to direct a frost protection agent onto the at least one moving air guide.

19. The apparatus of claim 8, comprising an anti-icing unblocking unit adapted to melt ice and snow and unblock the at least one moving air guide, wherein the anti-icing unit includes an electrical heating element integrated into the at least one moving air guide or a heating duct carried on the at least one moving air guide and a heating agent flowing through the heating duct.

20. The apparatus of claim 8, wherein the blocking detection sensor is a torque sensor configured to measure a torque of a rotatable part of the actuator.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

(1) Exemplary embodiments of the apparatus will be explained in more detail below with reference to the drawings, in which:

(2) FIG. 1 shows a schematic illustration of the new and improved apparatus,

(3) FIG. 2 shows a schematic illustration of a motor vehicle comprising a cooling system,

(4) FIG. 3 shows a perspective illustration of a radiator comprising slats,

(5) FIG. 4 shows an enlarged perspective illustration of the slats,

(6) FIG. 5 shows a schematic illustration of a first exemplary embodiment of a deicing system for the apparatus,

(7) FIG. 6 shows a schematic illustration of a second exemplary embodiment of a deicing system for the apparatus,

(8) FIG. 7 shows a schematic illustration of a third exemplary embodiment of a deicing system for the apparatus,

(9) FIG. 8 shows a schematic illustration of a fourth exemplary embodiment of a deicing system for the apparatus,

(10) FIG. 9 shows a flowchart of a deicing checking method, and

(11) FIG. 10 shows a schematic illustration of a control device of the apparatus.

DETAILED DESCRIPTION

(12) FIG. 1 shows an exemplary embodiment of the new and improved apparatus 1 according to the invention. The apparatus 1 serves to control a temperature, for example an operating temperature, of a vehicle component 3 shown in FIG. 2 which is an internal combustion engine in the exemplary embodiment. The internal combustion engine 3 is connected to a cooling apparatus 4 or to a radiator by means of a coolant line 20. The operating temperature is controlled by the cooling apparatus 4 of the vehicle 5 using a plurality of slats 6 (air guide 2) which control a cooling air stream 8 and control the size of at least one air inlet opening 7 (FIG. 2) and/or the flow of the cooling air stream 8. The slat arrangement forms a shutter.

(13) In FIG. 1, “A” identifies a slat position at a high temperature if maximum engine cooling is required. A high level of engine cooling may be required, for example, at high ambient temperatures, in the case of a steep slope of the roadway or a high trailer load, such as when a mobile home is attached or for another goods trailer. This slat position renders it possible for the air entering the front region of the vehicle 5 to be deflected in the direction of cooling lines in the cooling apparatus 4, called only radiator for short in the text which follows.

(14) The slats 6 are advantageously positioned in a streamlined manner, for example horizontally, at a high speed, this reducing the consumption of fuel.

(15) In FIG. 1, “B” identifies a slat position at a low temperature when the slats are not iced up, for example in the winter or if the internal combustion engine is in the start phase and is still cold. In this case, minimal engine cooling is desired. Owing to the then minimized free space between the slats 6, an effective air inlet opening is minimized because the slats 6 are vertical.

(16) The apparatus 1 constitutes an arrangement for a liquid radiator, in particular a water radiator, comprising cooling ducts 11 for cooling the internal combustion engine which is identified as component 3 in FIG. 2. This cooling principle can also be applied to other cooling arrangements of the vehicle or else to components of an electric vehicle. The vehicle can be a passenger car, truck, motorcycle, bus, mobile home or the like.

(17) The slats 6 serve to control or regulate an operating temperature or an air flow or an air inflow and for temperature-, speed- and/or load-dependent cooling of the cooling water and therefore of the internal combustion engine 3 of the vehicle 5.

(18) The slats 6 are arranged on a slat support part 18 (FIGS. 3 and 4) or a radiator grille, a radiator housing or the like.

(19) The temperature is therefore controlled by using the slats 6 which control the cooling air stream 8 and serve as air guide 2. The slats 6 can be adjusted by an actuator 25, where said actuator is identified only on the bottom slat 6 in FIG. 1 for reasons of simplifying the drawing. The actuator 25 rotates all of the slats 6 simultaneously or synchronously. The effective passage cross section of at least the air inlet opening 7 and/or the flow of the cooling air stream can be controlled in this way.

(20) As shown in FIG. 1, the mechanical actuator 25 is connected to a temperature-dependent control device 23 (FIG. 10). The control device 23 comprises a control unit 21 and an electric motor 24 or a comparable drive which moves all of the slats 6 at the same time by means of a gear assembly 26 or a comparable solution and is controlled by the electrical or electronic control unit 21. The control unit 21 is connected to a temperature sensor 22 for measuring an external temperature and is designed for processing an external temperature threshold value for providing a frost warning.

(21) The actuator 25 can be a drive shaft which is connected to the motor 24 by means of a gear or another drive means. The actuator 25 can be integrated in the slat arrangement, as shown in FIG. 3.

(22) A main sensor 29 for measuring the temperature of the engine 3 is connected to the control unit 21 for the purpose of controlling the slats during normal operation.

(23) The control device 23 or the control unit 21 is designed in such a way that an only partially open air guide protection position, as identified by “C” in FIG. 1, is at least temporarily set below the external temperature threshold value for providing a frost warning.

(24) The slats 6 are only partially open in position C, so that a sufficient gap between the slats and therefore a minimum level of air cooling are ensured in the protection position. Said gap allows cooling air to enter the radiator 4, so that the situation of a critical engine temperature being reached is avoided, even under unfavorable conditions, such as in the case of a trailer load, a slope or the like.

(25) However, secondly, the slats 6 are partially closed in the position C, so that air cooling is considerably reduced in comparison to the position A in order to optimize operation of the internal combustion engine to be cooled. The optimum situation is when a temperature increase in the engine runs more rapidly, that is to say approximately 1.5 to four times as sharply in comparison to the position A for example, in the first minutes after the engine is started.

(26) The control device 23 is designed in such a way that a corresponding protection position setting of the slats 6 is active in a parking mode of the vehicle 5. When the engine 3 is switched off, for example by operating an ignition key, a control instruction, which moves the slats 6 to the position C and allows them to remain there, can be made if the temperature sensor 22 outputs a temperature value of at most approximately +1° C.

(27) As illustrated in FIG. 1, a blocking detection sensor 19 for detecting a blocked state of the slats is further provided. Said blocking detection sensor can be designed as a torque sensor. The sensor 19 measures the torque of the actuator 25 or a corresponding actuator element which can be an operating shaft or another rotatable part. An error signal is output if the torque lies above a threshold value. As an alternative, the current of the motor 24 can be measured, said current increasing when the slats are frozen. An error signal can be output if the current lies above a threshold value. The motor 24 can therefore serve as a sensor at the same time.

(28) The apparatus is provided with an anti-icing unblocking unit 27 (FIG. 1) which is connected to the control unit 21. The anti-icing unblocking unit 27 is designed to melt the ice and/or the snow which causes the blocking. Embodiments of this unit 27 are shown in FIGS. 5 to 8. Said unit is designed in such a way that slats 6 which are blocked by ice or by snow are released by an anti-freeze agent deicing process, as shown in FIG. 5, or by a heating process, as shown in FIGS. 6 to 8.

(29) In the variant according to FIG. 5, the unit 21 is designed as a frost-protection agent spraying unit. The unit 21 comprises a frost-protection agent container or tank 28, a pump 17 which can be integrated in the tank 28, and nozzles 30 which are directed in the direction of the slats 6, as shown in FIG. 3. The nozzles 30 are connected to a frost-protection agent line 31 which leads to the tank 28. The pump 17 is controlled by the unit 21. The tank 28 can be the wiping water tank. As an alternative, a spray can solution with a controllable pressure valve can serve for deicing purposes or another type of spraying can be selected. After the spraying operation, the blocking detection sensor 19 can be used in order to establish whether the action was successful. This process can be repeated until the slats 6 move.

(30) As an alternative or in addition, a principle operating by heat supply according to FIGS. 6 to 8 can also be used for deicing purposes.

(31) FIG. 6 shows a first variant of the anti-icing unblocking unit 27 comprising heating elements 32, such as heating wires 32 which are integrated in the slats 6 for example. The heating elements can be heated using current, analogously to a windshield defrosting arrangement, and are arranged at freezing points 33, preferably at the touching slat ends, as shown in FIG. 4. The current is controlled by the control unit 21.

(32) FIG. 7 shows a solution with tubular heating elements 34 which can be heated by a—preferably liquid—heating agent 35. The radiator 4 is connected to the engine 3 by way of cooling lines 39. The coolant of the radiator 4 or a separate heating agent 35 can be provided for deicing purposes. An electric and/or hydraulic valve 40, which is connected to the control unit 21 and the supply line 37, controls the heat supply to the slats 6. The line 37 can be connected to the engine 3 or to the radiator 4. A thermostat 38, which is also connected to the line 37, is provided in this arrangement.

(33) FIG. 8 shows a deicing principle in which a fan 36, in particular a radiator fan of the radiator 4, is used, specifically with a reversed direction of rotation. The fan 36 is arranged between the engine 3 and the slats 6. Owing to the reversal in the direction of rotation, hot engine air is blown into the slat arrangement, so that said slat arrangement can deice. As an alternative, the fan 36 can be an electric fan heater. Said electric fan heater is connected to the control unit 21.

(34) The apparatus 1 can therefore be formed in such a way that an anti-icing unblocking unit 27 is provided which is formed in such a way that it can release the slats 6 by virtue of an anti-freeze agent deicing process (cf. FIG. 5).

(35) The apparatus 1 can also be formed in such a way that an anti-icing unblocking unit 27 is provided, which is designed in such a way that it releases the slats 6 by virtue of the action of heat (cf. FIGS. 6 to 8).

(36) The apparatus 1 can also be formed in such a way that the anti-icing unblocking unit 27 comprises heating elements which release the slats 6 by virtue of a heating-up process (cf. FIGS. 6 and 7).

(37) The apparatus 1 can also be formed in such a way that the heating elements are integrated in the air guide 2 (cf. FIGS. 6 and 7).

(38) The apparatus 1 can also be formed in such a way that the heating elements are designed as electrical heating elements (cf. FIG. 6).

(39) The apparatus 1 can also be formed in such a way that the heating elements are designed as heating ducts through which a heating agent, which is preferably heated by the component, flows (cf. FIG. 7).

(40) The apparatus 1 can also be formed in such a way that a heating air flow, which is heated by the engine 3, is blown by a fan 36 to the air guide 2 in order to deice the slats 6 (cf. FIG. 8).

(41) FIG. 9 illustrates a method for cyclically testing an iced-up state of the slats 6.

(42) The control device 23 is designed in such a way that the slats 6 are cyclically tested to check for a blocking state. This test is performed only below the temperature threshold value. An attempt is made to open and to close, or vice versa, the slats 6 by way of the actuator 25. If this is successful, the slats 6 are not iced up. However, if the slats 6 do not follow the control device, they are blocked. This can be established by the sensor 19.

(43) In S1 in FIG. 9, measurement by the sensor 22 checks whether the temperature threshold value of +1° C. is present or undershot.

(44) If yes, the slats 6 are then moved to the 100% position (fully open) and back to the starting position (30%) in S2.

(45) If the test (S3) is successful, no deicing measures are initiated (S4). The test is repeated (S2) after a waiting time (S5) of x seconds.

(46) If an error signal “Slats iced up” is output (NO in S3), a deicing measure is then initiated (S7) and, beforehand, a counter value, which counts the attempts, is compared (S6) with a maximum counter value (maximum number of attempts).

(47) If the counter value is lower than the maximum value (YES in S6), a (repeated) deicing measure is then carried out (S7) and the counter value is increased (S8) by one. Another check (S2) is made. If the counter value reaches the maximum value, an error message “Deicing not possible” (S9) follows.

(48) Therefore, the steps of: checking whether the external temperature lies below the external temperature threshold value (or is equal to this threshold value), outputting a control instruction to open the air guide when the external temperature falls below an external temperature threshold value, checking, after the control instruction to open the air guide has been output, whether the air guide means is set in accordance with a setpoint value, when the air guide is set in accordance with a setpoint value, repeating the checking process after a defined cycle time, when the air guide is not set in accordance with a setpoint value, repeating a deicing process until it is successful or a maximum value for attempts is reached are applied.

(49) The apparatus 1 for controlling a temperature with an air guide protection position C is not restricted to the exemplary embodiments shown. Cooling is not restricted to an internal combustion engine. The apparatus can also be used for cooling a climate-control system or A/C component, in particular a climate-control system condenser, for battery cooling, cooling fuel cell components or the like.