WO2016070993A1 - Vorrichtung zur überwachung eines ölthermostats - Google Patents
Vorrichtung zur überwachung eines ölthermostats Download PDFInfo
- Publication number
- WO2016070993A1 WO2016070993A1 PCT/EP2015/002214 EP2015002214W WO2016070993A1 WO 2016070993 A1 WO2016070993 A1 WO 2016070993A1 EP 2015002214 W EP2015002214 W EP 2015002214W WO 2016070993 A1 WO2016070993 A1 WO 2016070993A1
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- WIPO (PCT)
- Prior art keywords
- oil
- temperature
- thermostat
- parameter
- oil thermostat
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/005—Controlling temperature of lubricant
- F01M5/007—Thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
- F01M2011/1446—Indicating devices; Other safety devices for indicating the necessity to change the oil by considering pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/10—Indicating devices; Other safety devices
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
- F01M2011/1473—Indicating devices; Other safety devices for indicating the necessity to change the oil by considering temperature
Definitions
- the invention relates to a device for monitoring an arranged in an oil circuit of an internal combustion engine oil thermostat.
- DE 44 26 494 A1 discloses a device for monitoring the cooling system in an internal combustion engine, in which generates a characteristic of the cooling system temperature signal and then the course of the temperature signal is evaluated and detected temperature changes per unit time are compared with plausible values.
- the oil thermostat selectively supplies the oil supplied to it as a function of the oil temperature to a flow branch with an oil cooler or a bypass flow branch bypassing the oil cooler.
- a defective oil thermostat which can no longer conduct the oil through the oil cooler, usually causes engine damage due to the excessive oil temperature.
- a defective oil thermostat which is designed in its failure behavior to take the switching state in a case where the oil is always passed through the oil cooler, so as to prevent rapid damage to the internal combustion engine, on the other hand leads due to the increased friction in the longer term to increased fuel consumption and CO2 emissions.
- a failure of the oil thermostat takes place with Undefined state, for example, due to pollution (dirt, sand %), particles or chips, or due to mechanical forces or high pressure peaks, which can lead to deformations on the thermostat, which can lead to clamping in any thermostat position.
- hydraulic pressure peaks of up to 60 bar can occur in the oil circuit in today's engines, especially since oil can be very viscous in the cold start case.
- a defective water thermostat in the cooling water circuit can usually already be recognized by the fact that the operating temperature of the internal combustion engine is no longer or only very slowly achieved.
- a defect of the oil thermostat, however, for the driver is not or at least not promptly recognizable because a defective oil thermostat, which always supplies the oil to the oil cooler, usually does not affect the cooling function of the cooling system, but instead the longer-term fuel consumption, wear and durability the internal combustion engine.
- a defective oil thermostat which always supplies the oil to the oil cooler
- the object of the invention is in particular to reliably detect a defect or malfunction of the oil thermostat.
- the invention proposes a device for monitoring an oil thermostatic valve arranged in an oil circuit of an internal combustion engine.
- the monitored by the device oil thermostatic valve (hereinafter referred to briefly as Olthermostat) is formed in a conventional manner to supply the oil flow to a bypass flow branch and / or an oil cooler having a flow branch depending on a temperature of the Olthermostat supplied oil stream.
- the oil thermostat typically only supplies the oil to the bypass flow branch when the oil temperature at the oil thermostat, also referred to below as the inlet temperature, is below a first temperature threshold value. In this temperature range, a first outlet of the oil thermostat associated with the first flow branch is closed, which is opened only when the first temperature threshold value is exceeded.
- the oil thermostat may further be configured to close the bypass flow branch above a second temperature threshold, which is preferably above the first temperature threshold. In the temperature range between the two temperature threshold values, both flow branches are opened, wherein a second output of the oil thermostat associated with the bypass flow branch closes stepwise until the second temperature threshold value is reached.
- the first and second temperature thresholds can be the same size depending on the design of the Olthermostats.
- the device for monitoring the oil thermostat comprises a sensor device which is designed to determine at least one first parameter, by means of which a current setpoint operation of the oil thermostat can be derived, and to determine at least one second parameter, by means of which a current one Actual operation of the oil thermostat is derivable.
- the device further comprises an evaluation device, which is designed to detect an occurrence of a malfunction of the oil thermostat in dependence on the first parameter and the second parameter.
- a target operation of the Olthermostats is a normal operation, ie without assumed malfunction understood, in which the Olthermostat the desired temperature-dependent operating state, for example, the desired desired temperature-dependent position or movement of the actuator of the Olthermostats.
- the desired temperature-dependent operating state for example, the desired desired temperature-dependent position or movement of the actuator of the Olthermostats.
- an actual operation of the Olthermostats understood, for example, an actual current operating state. If no malfunction occurs, the setpoint mode and the actual mode match. In case of malfunction can the actual position of the oil thermostat and / or the actual movement of the actuator of the oil thermostat differ from the desired operation.
- the oil thermostat may be a rotary valve oil thermostat or an expansion oil oil thermostat, in particular a wax expansion oil thermostat.
- the oil thermostat can also be designed as a mechatronic actuator or actuator, with an electronic control unit that controls a mechanical actuator as a function of the oil temperature.
- the sensor device is designed to measure, as the first parameter, the inlet temperature of the oil and in particular its time profile, for example by means of a temperature sensor in the feed line to the oil thermostat.
- the inlet temperature is a measure of the oil temperature, which is applied to the input of the oil thermostat and in response to which the oil thermostat assumes a predefined opening or closing position with respect to the outputs to the first and second flow branch in the desired operation. It is particularly advantageous to measure the oil sump temperature as the inlet temperature, since there is usually already a temperature sensor in the oil sump of the oil circuit, which can be used.
- the oil sump temperature can be measured, for example, by means of an oil sump temperature sensor, which is integrated in the already existing oil level sensor of the oil sump.
- the oil sump temperature essentially corresponds to the oil temperature prevailing at the inlet of the oil thermostat. Since the oil temperature of the oil conveyed via an inlet line from the oil sump to the oil thermostat does not substantially change, the inlet temperature can also be determined at any other point along the inlet line by means of a suitably arranged temperature sensor.
- the sensor device can also be designed to measure a second oil temperature downstream of the oil cooler and upstream of the internal combustion engine and as the second parameter a temperature difference ⁇ from the inlet temperature minus to determine the second oil temperature.
- a temperature sensor For measuring the second oil temperature, a temperature sensor may be provided which, in the first flow branch, is located downstream of the oil cooler and upstream of a coalescence. is arranged guide of the first flow branch and the bypass flow branch.
- the temperature sensor can also be arranged downstream of an oil filter arranged by the internal combustion engine.
- the temperature sensor is designed as a combined pressure and temperature sensor, which are provided in a structural unit. Another advantageous possibility is to integrate the temperature sensor in an oil filter head.
- the evaluation device can be designed according to these variants, the occurrence of a malfunction of the Olthermostats on the basis of at least one of the following three conditions (a) to (c) recognize:
- a malfunction of the Olthermostats is detected when the inlet temperature is below the first temperature threshold, at least a predetermined reaction time has elapsed since the inlet temperature is below the first threshold temperature, and the temperature difference .DELTA. ⁇ from the inlet temperature minus the second Oltemperatur greater than a first Threshold is.
- the first output of the oil thermostat to the radiator should actually be closed in this case due to the low inlet temperature according to the target operation.
- the temperature difference .DELTA. ⁇ is greater than a first threshold, it can be concluded that there is oil cooling and the oil must therefore have flowed through the flow branch with the radiator and thus there is a malfunction of the thermostat.
- This first threshold value is determined as a function of the reduction in the oil temperature (cooling capacity of the oil cooler) produced by the oil cooler.
- the first threshold should be greater than usual variations in oil temperature between the oil sump and the engine, not caused by the oil cooler, but slightly less than the average cooling capacity of the oil cooler.
- the predetermined reaction time takes into account a time-delaying behavior of the oil thermostat and represents a time until after a change in the switching position of the Olthermostats the resulting temperature difference .DELTA. ⁇ would have set downstream of the Olthermostats.
- the reaction time depends on the type of Olthermostats and the location of the measuring point for the second temperature and can, for. B. be determined experimentally.
- the occurrence of malfunction of the oil thermostat may further be detected when the inlet temperature is above the first threshold temperature, at least the predetermined reaction time has elapsed since the inlet temperature is above the first threshold temperature, and the temperature difference ⁇ is less than a second threshold , In other words, at an inlet temperature above the first temperature threshold value, the oil flow supplied to the oil thermostat would then have to be fed to the oil cooler. If this is not the case, this can again be determined from the temperature difference, which is smaller than when the oil is cooled by the oil cooler.
- the second threshold may be set slightly below the difference temperature ⁇ normally caused by the radiator.
- the occurrence of a malfunction of the oil thermostat can also be detected if after exceeding the first temperature threshold by the inlet temperature, a gradient, in particular an increase in the temperature difference ⁇ , is slower than a predetermined desired increase in the temperature difference.
- the evaluation thus evaluates the course of the differential temperature over time and can compare this with a stored desired increase in the temperature difference.
- a particular advantage of this variant is that the evaluation of the rise in the temperature difference can be used as a leading indicator for an incipient malfunction of the oil thermostat. Investigations in the context of the invention have shown that before a complete malfunction of the oil thermostat whose actuator shows an incipient jamming or hooking, so that it does not open gradually, but moves relatively late. This can be detected by means of a delayed rise in the differential temperature.
- the aforementioned threshold values can be selected engine speed-dependent, such that larger threshold values are set at a larger actual engine speed. This takes into account the fact that with increasing engine speed, the cooling capacity of the oil cooler increases and thus the expected value of the temperature difference.
- the sensor device is designed as the second parameter, an oil pressure curve, in particular a time profile of the oil pressure, by means of a pressure sensor at a pressure measuring point, which is arranged downstream of the first output of the Olthermostats and upstream of the internal combustion engine.
- the evaluation device is designed to detect a malfunction of the oil thermostat when the measured time course of the oil pressure in a range of the inlet temperature, which is between the first oil temperature threshold and the aforementioned second temperature threshold, shows no pressure swing in the form of a negative or positive peak , Such a pressure swing corresponds to a peak-shaped pressure change whose peak height is greater than a predetermined value.
- This predetermined value for detecting a pressure surge can be determined experimentally in a specific oil cycle, such that pressure excursions that exceed this value do not result from normal pressure fluctuations but from a changed flow resistance downstream of the oil thermostat corresponding to at least partially opened first and second flow branches.
- a particularly advantageous variant of this embodiment provides in this case that the pressure measuring point or the pressure sensor for measuring the time profile of the oil pressure in the first flow branch between the first output of the oil thermostat and the oil cooler is arranged and that the pressure swing is a negative peak.
- the pressure measuring point downstream of the oil cooler and after a merger of the first flow branch and the bypass flow branch.
- the expected pressure swing in the nominal mode is a positive peak and the peak height.
- the inlet temperature of the oil can be measured as the first parameter, with the oil sump temperature preferably being measured as the inlet temperature. From the current inlet temperature, the desired operating state of the oil thermostat can be derived directly, since the actuator member of the oil thermostat assumes the predetermined setting positions as a function of the inlet temperature.
- the cooling water temperature can be used because the curves of the oil temperature and the cooling water temperature are correlated with each other in the desired operation. From the cooling water temperature can thus be derived a profile of the oil temperature in the supply line, from which in turn the desired operation of the Olthermostats can be derived.
- operating states of the vehicle can be used.
- An example of this is the operating state when the vehicle is cold-starting or when driving under full load.
- the oil inlet temperature is below the first temperature threshold, so that the first flow branch to the oil cooler would have to be closed during normal operation.
- this flow branch is usually open, if there is no defect.
- a further possibility of the realization according to the invention provides, for example, to determine a gradient of a feed temperature of the oil as the second parameter.
- a gradient of the oil sump temperature is determined for this purpose.
- the evaluation device is designed to determine a predetermined and stored in the memory of the evaluation target characteristic of the gradient of the inlet temperature and to detect a malfunction of the Olthermostats depending on the specific value of the first parameter, if the measured gradient of the inlet temperature is not within predetermined limits coincides with the setpoint characteristic.
- the evaluation device detects a journey under full load on the basis of the specific operating state, the evaluation device compares the measured temperature increase of the inlet temperature with the previously stored characteristic curve for journeys under full load. If the current increase in temperature of the oil feed temperature, determined on the basis of the second parameter, deviates from the previously stored temperature rise according to the characteristic curve, a malfunction of the oil thermostat can again be derived therefrom.
- the sensor device is designed to detect a position and / or a movement of an actuator of the oil thermostat as the second parameter.
- the evaluation device is designed to detect the malfunction of the Olthermostats based on the detected position and / or movement of the actuator by the detected position and / or movement of the actuator with the expected position and / or movement according to in dependence on the first Parameter is compared to certain nominal operation.
- the malfunction of the oil thermostat can be known if no movement of the actuator is detected in a predetermined oil temperature range or cooling water temperature range in which the actuator would have to move.
- the malfunction of the Olthermostats can be detected when, during a cold start, the actuator is in a position in which the first output is open and / or when driving under full load, the actuator is in a position in which the first output is closed ,
- a displacement sensor For detecting a position and / or movement of the actuator, a displacement sensor may be provided, which is mechanically coupled to the actuator motion.
- the displacement sensor may have a coupling rod, which is coupled for movement with the actuator of the oil thermostat.
- the sensor device is designed as an electrical resonant circuit with a coil, wherein the coil is arranged from the outside at or in the vicinity of the Olthermostats, such that a movement of the Actuator of the oil thermostat changes the inductance of the coil and thus an oscillation frequency of the resonant circuit.
- the sensor device may comprise a transmitting coil and a receiving coil, which are respectively arranged on opposite sides from the outside at or in the vicinity of the oil thermostat, so that a movement of the actuator of the oil thermostat changes a signal induced by the transmitter coil in the receiver coil.
- the advantage of the two latter variants over a mechanical coupling with the actuator is that no contact to the thermostatically controlled medium (oil) is present and no additional sealing elements, as would be necessary in the case of a coupling rod, are needed.
- Another advantage is that the monitoring system element in the form of the sensor device with the at least one coil has a much higher average life than the element to be monitored (oil thermostat) and thus can monitor the oil thermostat for the entire life of the vehicle.
- the device is designed as a mobile testing device for the workshop use.
- the mobile testing device further comprises fastening means for temporarily arranging the sensor device outside on or in the vicinity of the oil thermostat for a measuring operation.
- the sensor device in the context of the invention, it is also possible to form the sensor device as an integrated circuit in the oil thermostat, which is designed to detect a position and / or movement of the actuator of the oil thermostat by means of integrated switching contacts.
- the circuit may be designed so that it monitors the end positions of the valve disc of the oil thermostat by means of appropriate switching contacts.
- the integrated circuit is further designed such that it extracts its supply energy by means of an energy harvesting circuit of the oil heat and transmits a measurement signal wirelessly, preferably by means of a near-field radio transmission, to the evaluation device.
- a further possibility for designing the sensor device provides for arranging a temperature sensor at a measuring point, which is arranged in the first flow branch between the oil thermostat and the oil cooler.
- the oil temperature measured hereby downstream of the first output of the oil thermostat and even before the oil cooler can be determined on the one hand as the first parameter of the sensor device, since the temperature approximately matches the inlet temperature. From the measured temperature thus the desired operation of the Olthermostats can be derived.
- the temperature measurement immediately after the first output of the oil thermostat can also be used to determine the second parameter.
- a malfunction of the oil thermostat can be detected by the evaluation device, for example, if the measured oil temperature at this point remains essentially unchanged, after opening or closing of the first output would have been done according to the determined first size.
- two or more thermostats can be monitored in parallel, for example, a small and a large thermostat, which have either the same or different temperature settings and in which the outflow of oil supplies different Druckölverbrau- cher.
- a further aspect of the invention relates to a vehicle, in particular a utility vehicle, with a device as disclosed herein.
- a vehicle in particular a utility vehicle
- a device as disclosed herein.
- the preferred embodiments, variants and features of the invention described above can be combined with one another as desired. Further details and advantages of the invention will be described below with reference to the accompanying drawings. Show it:
- Figure 1 is a schematic representation of an oil circuit of an internal combustion engine for illustrating various embodiments;
- Figure 2 shows a characteristic temperature profile in case of malfunction of the oil thermostat;
- FIG. 3 shows a characteristic temperature profile in the case of a malfunction of the
- Figure 4 shows an increase in temperature at functioning and defective
- FIG. 5 shows an oil temperature-dependent course of the oil pressure
- FIG. 6 shows design variants for determining the position and / or movement of the actuator of the oil thermostat
- Figure 7 further variants for determining the position and / or
- Figure 1 shows schematically the components of an oil circuit 1, wherein only the part of the oil circuit is shown, which is arranged in the flow path between the oil sump and the internal combustion engine.
- an oil pan 2 is arranged, in which the oil sump 2 a is arranged, whose level is monitored by an oil level sensor 3.
- the oil from the oil sump 2 a is supplied via a feed line 5 to the flow input 11 of an oil thermostat 10.
- an oil pump 6, a pressure relief valve 7 and a return check valve 8 are arranged.
- the oil thermostat 10 is formed, for example, as a ring slide oil thermostat or Wachsausdehnungsölthermostat and includes an actuator that moves in response to the voltage applied to the input 11 of the oil thermostat 10 oil temperature (inlet temperature T2) in a certain position. Via the line 9, the oil supplied to the oil thermostat is applied to a control input of the oil thermostatic valve 10 and, for example, in the case of a wax expansion thermostat depending on the oil temperature to a warming and thus expansion or cooling and an in-itself contraction of the actuator of the oil thermostat so that the valve disks of the actuator are moved to open or close a first outlet 12 of the oil thermostat 10 and to close or open the second outlet 13 of the oil thermostat 10.
- the inlet temperature T2 of the oil is smaller than a first temperature threshold T1
- that outlet 12 of the oil thermostat 10 is closed, which connects the inlet line 5 with a first flow branch 17, in which an oil cooler 16 is arranged.
- the oil is supplied via the second outlet 13 of the oil thermostat 10 to a second bypass flow branch 18, which bypasses the oil cooler 16.
- the inlet temperature T2 is greater than a second temperature threshold T1 *, which is above the value T1
- the second outlet 13 is completely closed and the first outlet 12 is opened, so that the oil flows exclusively via the oil cooler 16.
- the first output is open and the second output is only partially closed.
- the first flow branch 17 and the second flow branch 18 are brought together after the oil cooler 16 to form a common flow section 19.
- the oil then flows through an oil filter 20, which further comprises a filter service valve 21 and a filter bypass valve 22. Downstream of the oil filter 20 is followed by a siphon 23 in the oil filter head and an oil pressure sensor integrated in the oil filter head 25. Subsequently, the oil through the line section 26 of the internal combustion engine (not shown).
- a device for monitoring the oil thermostat is also provided in order to detect a malfunction of the oil thermostat.
- the device comprises a sensor device which is designed to determine at least one first parameter by means of which or from which a current operation of the oil thermostat 10 can be derived.
- the sensor device can comprise, for example, a temperature sensor 4 which determines the oil sump temperature as the first parameter.
- the oil sump temperature T2 essentially corresponds to the oil temperature which is applied to the oil thermostat 10 and which determines the position of the actuator in the setpoint mode.
- the oil sump temperature sensor 4 may be integrated in the oil level sensor 3 and provided as a so-called combination sensor.
- the target operating state of the oil thermostat 10 can be derived directly from the determined oil sump temperature become.
- the first outlet 12 to the first flow branch 17, comprising the oil cooler 16 is closed at oil sump temperatures T2 ⁇ T1.
- T2> T1 and T2 ⁇ T1 * the flow through the first flow branch 17 is open, and the bypass flow branch 18 is also still partially open.
- T1 Exemplary values for T1 are in the range of 95 degrees to 105 degrees and for T1 * about 120 degrees.
- the sensor device of the device for monitoring the oil thermostat is further configured to determine a second parameter, by means of which a current actual operation of the oil thermostat can be derived.
- the temperature sensor 14b may be used, which is arranged downstream of the oil cooler 16 in the first flow branch 17, before it is merged with the bypass flow branch 18. With this temperature sensor 14b, a second oil temperature T3 can be measured downstream of the oil cooler 16. From this second oil temperature T3 a temperature difference .DELTA. ⁇ from the inlet temperature T2 minus the second oil temperature T3 can then be determined, on the basis of which it can be determined whether the actual operation of the oil thermostat 10 coincides with the expected target operation.
- FIG. 2 shows a time profile of the inlet temperature T2, which was determined by means of the sensor 4, and a time profile of the second oil temperature T3, which was measured with the sensor 14b downstream of the oil cooler 16.
- the dashed line T1 indicates the threshold value of the opening temperature T1.
- the inlet temperature T2 is smaller than the opening temperature T1 of the first output 12 of the oil thermostat 10. In the desired operation, therefore, the first flow branch should not be traversed by oil, since the first output 12 would have to be closed in this case.
- Figure 2 shows a temperature profile that occurs in a malfunction of the oil thermostat 10, z. B. in case of a defect of the actuator, the oil cooler 16 even at inlet temperatures T2 ⁇ T1 of Oil is flowed through. As a result, the oil is cooled by the oil cooler 16 by the amount ⁇ .
- An evaluation unit 40 connected to the sensor device 4, 14b via a signal input line 41 now checks on the basis of the determined measured values whether the determined temperature difference ⁇ has a value which is expected according to a desired operation or if a malfunction of the oil thermostat 10 is present.
- the evaluation unit 40 checks whether the temperature difference ⁇ from the inlet temperature T2 minus the second oil temperature T3 is less than a predetermined first temperature threshold ⁇ 1.
- a malfunction of the Olthermostats is detected when the inlet temperature is below the first temperature threshold, at least a predetermined reaction time Z1 has elapsed since the inlet temperature is below the first temperature threshold T1, and the temperature difference ⁇ from the inlet temperature minus the second oil temperature greater than a first threshold ⁇ 1 is.
- the first threshold value ⁇ 1 is determined as a function of the reduction in the oil temperature (cooling capacity of the oil cooler) produced by the oil cooler.
- the first threshold should be greater than the usual variations in oil temperature between the oil sump and the engine, not caused by the oil cooler, but slightly less than the average cooling capacity of the oil cooler.
- the predetermined reaction time Z1 takes into account a time-delaying behavior of the oil thermostat and represents a time until after a change in the switching position of the Olthermostats the resulting temperature difference .DELTA. ⁇ would have set downstream of the Olthermostats.
- the reaction time depends on the type of Olthermostats and the location of the measuring point for the second temperature and can, for. B. be determined experimentally. If the evaluation device 40 detects a malfunction of the oil thermostat 10, it outputs a warning signal via the output line 42, the z. B. is output via a display device in the cockpit of the vehicle.
- FIG. 3 shows the temperature profile in case of malfunction of the oil thermostat 10, in which the oil thermostat 10 despite a feed temperature T1, which is greater than the first temperature threshold T1, does not go to a position in which the first output 12 is open and the oil cooler 16 of Oil is flowed through.
- the temperature profile T3 is slightly below the temperature profile T2 results from the fact that the bypass flow branch 18 is arranged spatially in the vicinity of the oil cooler 16 and thereby radiates some cooling power from the oil cooler 16 and also the oil in the bypass flow branch 18 cools slightly.
- the evaluation of the differential temperature ⁇ is again carried out only after a predetermined reaction period Z1 has elapsed.
- FIG. 4 illustrates a further possibility of recognizing a malfunction according to an embodiment variant.
- the dashed line T1 again denotes the first temperature threshold, below which the first outlet is closed and above which the first outlet 12 is opened.
- the time profile of the inlet temperature T2 is again measured with the temperature sensor 4 in the oil sump of the oil circuit 1.
- FIG. 4 shows the time profile of the inlet temperature T2, starting from a cold start of the vehicle.
- the cold start area is represented by the area marked K.
- the temperature range Z2 indicates the thermostat opening area which starts after the Inlet temperature T2 exceeds the opening temperature T1.
- the following area B indicates an area of steady-state inertia.
- the dashed line which is identified by the reference symbol T3, indicates the course of the oil temperature which is measured before the internal combustion engine but downstream of the oil cooler 16, for example with the temperature sensor 24.
- the oil cooler In the cold start region K below the temperature threshold T1, the oil cooler is closed as expected, so that the temperature T3 follows the course of the inlet temperature T2 and only minimally below its value, due to the above-mentioned radiation effects of the radiator 16.
- a temporal temperature profile is also shown, which is indicated by the dashed line T3.1 and can be measured at slightly defective Olthermostat 10 at the sensor 24.
- the temperature shear between inlet temperature T2 and temperature T3.1 after the oil cooler does not divide as quickly as according to the course T3.2, although the temperature difference ⁇ from the point B1 in both temperature curves is again the same.
- the temperature profile T3.1 can be observed in an oil thermostat 10, whose actuator already shows an incipient clamping behavior or a slight hooking, so that the actuator initially "clamps" in the region Z2 and only becomes one Josr devist later and jumps into the complete open position by leaps and bounds.
- Such a clamping behavior indicates a future complete jamming of the oil thermostat 10 out.
- the evaluation device 40 recognizes such a malfunction due to the increase in the temperature difference .DELTA. ⁇ , when the increase in the temperature difference is slower than a predetermined desired increase in the temperature difference. In other words, the time course of the temperature difference is detected. If this is less than a predetermined desired increase, which is stored in the form of an experimentally determined characteristic in the evaluation device 40, a malfunction of the oil thermostat 10 is detected.
- One way to detect a malfunction is to specify a minimum value for the temperature difference of T2 and T3, which must be reached after exceeding the opening temperature T1 after a predetermined reaction time. If the measured temperature difference is less than the minimum value for the temperature difference after the specified reaction time has elapsed, there is a malfunction.
- thermostats may be subject to a set temperature tolerance when new. This can basically be taken into account in the evaluation unit, for example, with continuous increase in wear of the thermostat, the defined temperature limits T1 and T1 *, which lead to a movement of the actuating mechanism, increasingly torn or displaced.
- calculation sequences can be active and maps can be stored which adapt the defined temperature limits T1 and T1 * and / or the threshold values ⁇ 1 and ⁇ 2 for the monitoring variants of FIGS. 2 to 4 as a result of wear, so as to replace or replace the thermostat only then to signal if the proper operation of the engine should no longer be guaranteed without doubt.
- FIG. 5 illustrates a further possibility according to the invention for detecting a defect situation of the oil thermostat 10.
- the sensor device is set up by means of a pressure sensor 15, which is arranged in the first flow branch 17 between the first outlet 12 of the oil thermostat 10 and the oil cooler 16, a temporal pressure curve measure up. Furthermore, the sensor device again determines the time profile of the inlet temperature T2, for example by means of the temperature sensor 4.
- the dashed lines indicate the region between the two temperature threshold values T1 and T1 * of the oil thermostat.
- T1 and T1 * of the oil thermostat.
- the first Output 12 closed when the inlet temperature T2 is below the value T1.
- the first output Above the temperature T1 *, the first output is fully opened and the second output 13 is completely closed.
- the first output 12 is opened and the second output 13 is only partially closed, so that oil flows through both the first flow branch 17 and the second flow branch 18.
- the measured by the pressure sensor 15 temporal pressure curve is shown with the curve P.
- the pressure curve P describes the course of a normally functioning oil thermostat 10.
- the pressure curve essentially has the value P1 and in the ranges in which the inlet temperature is above the value T1 * , the value P2.
- P2 is substantially higher than P1
- the oil cooler 16 has a higher flow resistance than the bypass line 18 and thus leads to increased pressure values P2.
- both lines are at least partially open, so that the flow resistance in this area is the lowest. This leads to a negative pressure peak ⁇ in the region of the temporal pressure curve between T1 and T1 *.
- the pressure profile can also be measured for example with the pressure sensor 25, which is arranged after the oil filter.
- the target pressure profile differs from that shown in FIG. 5 in that a positive peak is measured in the transitional regions between T1 and T1 * since the oil flow rate at the measuring point of the pressure sensor 25 is greatest in this region. If, in contrast to FIG. 5, no positive peak in this range is measured in the transition region, it is again possible to conclude that there is a malfunction.
- the temperature sensors 4, 14a, 14b and 24 and the pressure sensors 15 and 25 have all been shown simultaneously in FIG. 1 for ease of illustration.
- the temperature sensor 4 for the determination of the inlet temperature and to determine the differential temperature additionally to use the sensor 14 b or 24.
- the temperature sensors 14b and 24 for example, only one pressure sensor 15 or 25 may be provided, if the defect detection takes place on the basis of the pressure curve P and not on the basis of the differential temperature ⁇ .
- the oil thermostat 0, the oil cooler 16, the oil filter 20, the filter service valve 21, the filter bypass valve 22, the oil siphon 23 and the sensors 14 a, 15, 23, and 24 structurally integrated in an oil module, which is the dashed line 27th is shown.
- FIG. 6 again, a part of an oil circuit is shown, now in a schematic constructional representation.
- the oil pan is designated and the reference numeral 6, the oil pump, which promotes oil from the oil pan 2 and the oil thermostat 10 supplies.
- the reference numeral 12 again denotes the first outlet of the oil thermostat 10, which supplies oil to the oil cooler 16 via the first flow branch 17.
- the second output of the Olthermostats 10 is indicated, via the oil to the bypass flow branch 18 can be fed.
- FIG. 6 again, a part of an oil circuit is shown, now in a schematic constructional representation.
- the oil pan is designated and the reference numeral 6, the oil pump, which promotes oil from the oil pan 2 and the oil thermostat 10 supplies.
- the reference numeral 12 again denotes the first outlet of the oil thermostat 10, which supplies oil to the oil cooler 16 via the first flow branch 17.
- the second output of the Olthermostats 10 is indicated, via the oil to the bypass flow branch 18 can be fed.
- cooling water circuit a part of the cooling water circuit is shown with a cooling water supply line 70, a region 71 forming part of the oil cooler functionality and in which the cooling water flows around the meandering oil passage of the oil cooler 16 and a line section 72 over which the oil cooler 16 heated cooling water is discharged.
- reference numeral 73 is only highly schematized the return of the oil after passing through the region of the engine back to the oil pan 2 indicated.
- Reference numbers 14a and 15 again denote the temperature and pressure sensors already shown in FIG. 1, which are arranged in the first flow branch 17 after the first outlet 12 of the oil thermostat 10. These are lying in a structural unit as combined sensor unit 14a, 15 executed, which can be used both for pressure measurement and temperature measurement.
- the function of the oil thermostat can also be monitored directly by means of a displacement sensor 81, in which a coupling rod 82 is mechanically coupled directly to the actuator 10b of the oil thermostat 10.
- the movement of the actuator 10b of the oil thermostat 10 is thus detected directly by the displacement sensor 81 and output via an output line 83 from the position sensor 81 to the evaluation device 40.
- the evaluation device 40 is designed to diagnose a malfunction if no movement of the actuator 10b takes place when the opening temperature T1 or generally when the temperature range between T1 and T1 * is reached.
- FIG. 6 illustrates yet another alternative embodiment as an alternative to the use of the displacement sensor 81.
- an integrated circuit 80 designed to detect a position and / or movement of the actuator 10b of the oil thermostat 10 by means of integrated switching contacts may be provided inside the oil thermostat 10 ,
- a switching contact of the circuit 80 is disposed at one end of the actuator 10b and detects movement of a valve disk 10c of the actuator 10b as it moves to close or open an outlet of the oil thermostat 10 while being in contact or out of contact with the switching contact comes.
- the integrated circuit 80 is designed to extract its supply energy by means of a so-called energy harvesting circuit of the oil heat. Such energy harvesting circuits are known per se from the prior art. Furthermore, the circuit 80 is designed to transmit its measuring signals wirelessly to the evaluation device 40 by means of a near-field radio transmission. Thereby, the integrated circuit can be completely encapsulated by the oil thermostat 10, so that no additional sealing elements, signal lines or power supply lines must be provided.
- FIG. 7 shows two further variants of the invention, which in turn are shown at the same time in FIG. 7, but can each be used separately.
- the movement of the actuator 10b of the Olthermostats 10 is now determined inductively by means of either a resonant circuit with a coil 76 or by means of two coils 74 and 75.
- the sensor device comprises an electrical oscillating circuit with a coil 76, wherein the coil 76 is arranged on the outside of the housing 10a of the oil thermostat 10.
- the coil is arranged so that a movement of the actuator 0b of the Olthermostats 10, which is carried out magnetically, the inductance of the coil 76 and thus an oscillation frequency of the resonant circuit changes.
- the measuring signal of the resonant circuit with the coil 76 is transmitted to the evaluation device 40 via a signal line 76a.
- the evaluation device 40 can in turn monitor the function of the oil thermostat 10 by using one of the aforementioned possibilities for determining a first parameter from which the desired operation of the Olthermostats can be derived determines when an actuator of the Olthermostats 10 would have to move. Based on the detected frequency of the resonant circuit, the evaluation device 40 can further determine whether an expected movement of the actuator 10b actually takes place at the expected time or whether, for example, the actuator is stuck and thus no change in the oscillation frequency can be measured.
- Another way to detect the movement of the actuator 10b of the oil thermostat 10 without contact is to design the sensor device so that a transmitter coil 74 and a receiver coil 75 are disposed on opposite sides from outside the oil thermostat housing 10b or in its vicinity.
- a movement of the magnetic actuator 10b of the Olthermostats 10 then changed by the transmitter coil 74 in the receiver coil 75 induced signal, which is transmitted via a signal line 75a to the evaluation device 40.
- This change can in turn be diagnosed by the evaluation device 40, so that the presence of such a change in the signal received by the receiver coil correspondingly indicates a normal function of the oil thermostat. If, at the expected time according to the target operation, no such measured change of the received signal with the receiver coil, there is a malfunction of the oil thermostat 10 before.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/524,838 US10287934B2 (en) | 2014-11-06 | 2015-11-04 | Apparatus for monitoring an oil thermostat |
BR112017009549-1A BR112017009549B1 (pt) | 2014-11-06 | 2015-11-04 | Dispositivo para monitoramento de um termostato de óleo |
EP15794465.3A EP3215723B1 (de) | 2014-11-06 | 2015-11-04 | Vorrichtung zur überwachung eines ölthermostats |
RU2017119467A RU2702208C2 (ru) | 2014-11-06 | 2015-11-04 | Устройство для контроля масляного термостата |
CN201580060309.2A CN107075992B (zh) | 2014-11-06 | 2015-11-04 | 用于监控油温控器的设备 |
Applications Claiming Priority (2)
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DE102014016307.5 | 2014-11-06 | ||
DE102014016307.5A DE102014016307A1 (de) | 2014-11-06 | 2014-11-06 | Vorrichtung zur Überwachung eines Ölthermostats |
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WO2016070993A1 true WO2016070993A1 (de) | 2016-05-12 |
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PCT/EP2015/002214 WO2016070993A1 (de) | 2014-11-06 | 2015-11-04 | Vorrichtung zur überwachung eines ölthermostats |
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US (1) | US10287934B2 (de) |
EP (1) | EP3215723B1 (de) |
CN (1) | CN107075992B (de) |
DE (1) | DE102014016307A1 (de) |
RU (1) | RU2702208C2 (de) |
WO (1) | WO2016070993A1 (de) |
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US10920628B2 (en) * | 2015-08-25 | 2021-02-16 | Cummins Inc. | Cooling assembly for a filter head of an engine |
DE102016208153A1 (de) * | 2016-05-12 | 2017-11-16 | Friedrich-Alexander-Universität Erlangen-Nürnberg | Messanordnung für Schmieröl und Messverfahren |
US11598230B2 (en) * | 2017-12-29 | 2023-03-07 | Volvo Truck Corporation | Fluid circuit and a process for controlling a flow of fluid supplied to at least one equipment |
DE102018125256B4 (de) * | 2018-10-12 | 2020-10-15 | Single Holding GmbH | Diagnoseverfahren für Temperiervorrichtungen |
CN113494347B (zh) * | 2021-08-09 | 2022-10-18 | 一汽解放汽车有限公司 | 发动机冷却系统的控制方法 |
CN115063045B (zh) * | 2022-08-08 | 2022-11-15 | 淄博威世能净油设备有限公司 | 一种基于数据处理的净油机运行效率评估系统 |
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2014
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2015
- 2015-11-04 WO PCT/EP2015/002214 patent/WO2016070993A1/de active Application Filing
- 2015-11-04 CN CN201580060309.2A patent/CN107075992B/zh active Active
- 2015-11-04 US US15/524,838 patent/US10287934B2/en active Active
- 2015-11-04 EP EP15794465.3A patent/EP3215723B1/de active Active
- 2015-11-04 RU RU2017119467A patent/RU2702208C2/ru active
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Also Published As
Publication number | Publication date |
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RU2017119467A3 (de) | 2019-04-01 |
BR112017009549A2 (pt) | 2019-05-14 |
EP3215723B1 (de) | 2022-09-28 |
RU2017119467A (ru) | 2018-12-06 |
US20170342877A1 (en) | 2017-11-30 |
RU2702208C2 (ru) | 2019-10-04 |
CN107075992B (zh) | 2019-11-26 |
DE102014016307A1 (de) | 2016-05-12 |
US10287934B2 (en) | 2019-05-14 |
EP3215723A1 (de) | 2017-09-13 |
CN107075992A (zh) | 2017-08-18 |
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