HUMIDITY MEASURING DEVICE, CONTROL DEVICE FOR AN INTERNAL COMBUSTION ENGINE AND ANOMAL DETECTION DEVICE

Abstract

Humidity measuring device configured to measure the humidity of a gas, the humidity measuring device comprising: a humidity detection part (68); a second-order computation part (S103, S107, S117, S303) configured to compute a second-order differential value (RH2) by performing a second-order time differentiation on a humidity signal output by the humidity detection part (68); and an adhesion determination part (S105, S106, S108, S115, S116, S118, S306, S316) configured to determine whether a liquid is adhered to the moisture detection part (68) based on the second order differential value (RH2) obtained by the second order computation part (S103, S107, S117, S303).

Description

CROSS-REFERENCE TO A SIMILAR REGISTRATION

[0001] The present application claims the priority benefit of Japanese patent application no. JP 2017-15284, filed on January 31, 2017. All disclosures of the above-mentioned applications are incorporated herein by reference. TECHNICAL AREA

[0002] The present disclosure relates to a moisture measuring device, a control device for an internal combustion engine and an anomaly detection device. STATE OF THE ART

[0003] Conventionally, as a humidity measuring device for measuring the moisture content of a gas, patent literature 1 discloses, for example, a humidity measuring device for measuring intake air introduced into an internal combustion engine. In addition to measuring humidity, the humidity measuring device is configured to determine whether or not water droplets adhere to a surface of a moisture detection sensor element. If the water droplets adhere to a surface of a humidity sensor in patent literature 1, a detection value of the humidity sensor indicates a humidity level of approximately 100%, and the detection value of the humidity sensor does not change, even though a detection value of a temperature sensor changes.Therefore, the humidity measuring device of patent literature 1 calculates an index, obtained by dividing a rate of change of temperature by a rate of change of humidity, using the temperature and the humidity detected by the temperature sensor and the humidity sensor, and determines whether a condition in which the index is greater than a threshold for a specified time or longer should be allowed to continue or not. Subsequently, it is detected that the water droplet adheres to the surface of the humidity sensor if the condition persists for the specified time or longer. TECHNICAL LITERATURE ON THE STATE OF TECHNICAL PATENT LITERATURE

[0004] PATENT LITERATURE 1: WO 2015 / 87644 A1

[0005] However, in the humidity measuring device described in the preceding patent literature 1, it is assumed that the detection value of the temperature sensor does not change from a predetermined value even when a water droplet adheres to its surface, just as the detection value of the humidity sensor does not change when a water droplet adheres to its surface. Therefore, if water droplets adhere to both the temperature sensor and the humidity sensor, the index does not have a suitable value, leading to the problem that the water droplets adhering to the humidity sensor cannot be determined with high accuracy.

[0006] Furthermore, the moisture measuring device described in the aforementioned patent literature 1 determines whether the condition in which the index exceeds the threshold value persists for the specified time or longer. Therefore, at least the specified time is required from the point in time when the water droplet actually adheres to the moisture sensor until the point in time when the water droplet's adhesion to the moisture sensor can be detected. For this reason, even if no water droplet adheres to the surface of the moisture sensor, the responsiveness at the time of determining whether the water droplet is adhering or not may be reduced. SUMMARY OF THE INVENTION

[0007] One objective of the present disclosure is to provide a moisture measuring device, a control device for an internal combustion engine and an anomaly detection device that is capable of accurately detecting the adhesion of a liquid to a moisture detection element.

[0008] According to a first aspect of the present disclosure, a humidity measuring device is configured to measure the humidity of a gas. The humidity measuring device comprises a second-order computational part configured to calculate a second-order differential by performing a second-order time differentiation on a humidity signal output of a humidity detection part. The humidity measuring device further comprises an adhesion determination part configured to determine whether a liquid is adhered to the humidity detection part, based on the second-order differential obtained by the second-order computational part.

[0009] According to a second aspect of the present disclosure, a control device for an internal combustion engine is described, wherein the control device is configured to control an operating state of an internal combustion engine supplied with intake air. The control device includes a humidity control section configured to maintain the humidity of the intake air based on a humidity signal output by a humidity detection section. The control device further includes a parameter setting section configured to set a maintenance result of the humidity control section as one of the parameters for controlling the operating state of the internal combustion engine.The control device further includes a second-order computation section configured to calculate a second-order differential by performing a second-order differentiation of the humidity signal after a certain time. The control device further includes an adhesion determination section configured to determine whether a liquid has adhered to the humidity detection section based on the second-order differential obtained from the second-order computation section. The control device further includes a substitute setting section configured to set a predetermined substitute humidity for the intake air humidity as one of its parameters, instead of obtaining the maintenance result from the humidity detection section in response to the adhesion determination section's finding that a liquid has adhered to the humidity detection section.

[0010] According to a third aspect of the present disclosure, an anomaly detection device is configured to detect the adhesion of a liquid to a moisture detection element, which is configured to output a moisture signal as an anomaly based on the moisture content of a gas. The anomaly detection device includes a second-order computational element configured to calculate a second-order differential by performing a second-order differentiation of the moisture signal over a period of time. The anomaly detection device further includes an adhesion determination element configured to determine whether the liquid has adhered to the moisture detection element based on the second-order differential obtained from the second-order computational element.

[0011] The inventors present have acquired such knowledge that when liquid adheres to the moisture detection element and is subsequently dried and eliminated, the rate of change of the moisture signal output by the moisture detection element is steeper than the rate at which the moisture actually changes. According to the above knowledge, the steepness of an increase or decrease in the moisture signal is determined based on a second-order differential value, which is a rate of change of the moisture signal. This allows a distinction to be made between a case in which liquid adheres to the moisture detection element and a case in which the moisture actually changes without the liquid adhering. Furthermore, according to the above knowledge, the case in which the liquid adhering to the moisture detection element...A distinction is made between the case where the liquid adheres, is lost, and the case where the liquid is not lost.

[0012] Since the differential value of the second-order humidity signal is used to determine whether liquid is adhering to the moisture detection element, it is therefore unnecessary to use the temperature measured by the temperature detection element. For example, the second-order differential value is used to determine whether the increase in humidity is steep, thus distinguishing the occurrence of liquid adhering to the moisture detection element from the actual increase in humidity. Furthermore, the second-order differential value is used to determine whether the decrease in humidity is steep, allowing for a highly accurate determination of whether the liquid adhering to the moisture detection element is being lost.Furthermore, it is not necessary to wait a predetermined time to confirm that the detection value of the moisture detection element has not changed from the set value. Therefore, the responsiveness of the determination can be improved, while the accuracy of the determination regarding the presence of liquid on the moisture detection element is increased. In other words, the degree of liquid adhesion to the moisture detection element can be accurately detected. List of characters

[0013] The above-mentioned and other objects, features, and advantages of the present disclosure will become apparent from the following detailed description with reference to the accompanying drawings. The figures show the following: Fig. Figure 1 is a schematic diagram representing a configuration of a control system according to a first embodiment. Fig. Figure 2 is a front view of an air flow meter in a state where the air flow meter is attached to an intake pipe. Fig. Figure 3 is a cross-sectional view along the line III-III from Fig. 2, Fig. Figure 4 is a perspective view of a sensor chip. Fig. Figure 5 is a vertical cross-sectional view of the sensor chip. Fig. 6 is a block diagram showing an electrical configuration of the control system, Fig. Figure 7 is a time graph showing the modes of change of moisture, a first-order differential value, and a second-order differential value when water droplets adhere to a moisture detection part. Fig. Figure 8 is a time graph showing the modes of change of humidity and a second-order differential value when water droplets adhere to the humidity detection part. Fig. 9 is a flowchart that illustrates the process of a water droplet determination procedure, Fig. Figure 10 is a flowchart illustrating the sequence of a water droplet determination method according to a second embodiment. Fig. Figure 11 is a block diagram representing an electrical configuration of a control system according to a third embodiment. Fig. Figure 12 is a flowchart that illustrates the sequence of an engine control procedure. Fig. Figure 13 is a front view of an air flow meter in a state where it is attached to an intake pipe in modification 1. Fig. Figure 14 is a front view of an air flow meter in a state where it is attached to an intake pipe in modification 2, and Fig. Figure 15 is a vertical cross-sectional view of the sensor chip. DESCRIPTION OF EXECUTION FORMS

[0014] In the following, a plurality of embodiments of the present disclosure are described with reference to the drawings. Incidentally, the corresponding components in each embodiment are assigned the same reference numerals, thus avoiding duplicate descriptions. If only part of the configuration is described in each embodiment, the configuration of the other embodiments described above can be applied to the remaining parts of the configuration. Furthermore, not only the combinations of the configurations explicitly shown in the description of the respective embodiments, but also the configurations of the plurality of embodiments can be partially combined, even if the combinations are not explicitly shown, provided that no problem exists in the combination.Unspecified combinations of the configurations and modification examples described in the majority of the embodiments are also disclosed in the following description. (First embodiment)

[0015] A in Fig. 1. Tax system shown 10 includes an internal combustion engine 11 , such as a diesel engine, an intake flow channel 12 , an exhaust gas flow channel 13 , an airflow meter 14 and an ECU (Engine Control Unit) 15 The tax system 10 It includes an EGR (Exhaust Gas Recirculation) system capable of adjusting the amount of EGR. The EGR system includes an intercooler. 16 , an EGR flow channel 17 , an EGR valve 18 and an EGR cooler 19 The internal combustion engine 11It could be a diesel engine, a gasoline engine, or something similar.

[0016] The airflow meter 14 is in the intake flow channel 12 designed and has the function of measuring a physical quantity such as flow velocity, temperature, humidity and pressure in relation to the internal combustion engine 11 to measure the supplied intake air. The intake air is a gas that enters a combustion chamber. 11a of the internal combustion engine 11 is supplied.

[0017] The ECU 15 is a computing and processing circuit powered by a processor 15a , a storage medium such as RAM, ROM and flash memory, a microcomputer configured with an input and output section, a power supply circuit and the like. A sensor signal that comes from the airflow meter 14A sensor signal, output by a large number of vehicle-mounted sensors, and the like, are fed into the ECU. 15 entered. The ECU 15 An engine control unit determines the opening degree of a throttle valve. 21 , a fuel injection quantity of an injector 22 and the opening degree of an EGR valve 18 using a measurement result from the air flow meter 14 through the ECU 15 corresponds to a control unit for the internal combustion engine for controlling the operation of the internal combustion engine. 11 , and the tax system 10 can be described as an engine control system.

[0018] The airflow meter 14 is one of several measuring components used in the control system 10 are included in the intake system and exhaust system of the internal combustion engine. 11 Examples include an intake air temperature sensor.25 , an air-fuel ratio sensor 26 , an oxygen sensor 27 , a throttle valve opening sensor 28 and the like, in addition to the airflow meter 14 Intended as measuring components. The internal combustion engine 11 is equipped with a crank angle sensor 29 and the like, provided as a measuring component.

[0019] In the intake flow channel 12 The airflow meter is located 14 on a downstream side of an air filter 31 The airflow meter 14 is located on an upstream side of a connecting part between the intake flow channel 12 and the EGR flow channel 17 In the configuration above, it is less likely that the airflow meter will 14 one from the EGR flow channel 17 is exposed to flowing gas.

[0020] The airflow meter 14It measures not only the intake air volume flow rate, but also the humidity of the intake air with high responsiveness and accuracy, enabling it to optimally control the EGR quantity and leading to low fuel consumption and low exhaust emissions from the combustion engine. 11 to contribute. The airflow meter 14 outputs flow information that corresponds to the flow rate through the intake flow channel 12 of the internal combustion engine 11 corresponding to the flowing intake air, and temperature and humidity information corresponding to the temperature and humidity of the intake air passing through the intake flow duct 12 to the ECU 15 The flow is from an external device. The following description describes an inlet side of the inlet flow channel. 12 , into which air is introduced, as the upstream side of the inlet flow channel 12and the combustion chamber 11a -side as the downstream side of the inlet flow channel 12 defined.

[0021] The one in the Fig. 2 and Fig. 3 air flow meters shown 14 It can be detached from an intake pipe. 12a attached, which secures the intake flow channel 12 forms. The airflow meter 14 is inserted into a sensor slot 12b inserted, which is intended to pass through a cylindrical wall of the intake pipe 12a to penetrate, and at least part of the airflow meter 14 is in the intake flow channel 12 positioned. The airflow meter 14 includes a housing 41 , a flow detection component 42 , a sensor unit 43 and a signal processing section 44 (see Fig. 6).

[0022] The case 41 It consists, for example, of a resin material or the like. In the airflow meter14 will be, since the case 41 to the intake pipe 12a The flow detection part is attached or fixed. 42 and the sensor unit 43 with the through the intake flow channel 12 brought into contact with the flowing intake air. The housing 41 is equipped with a bypass part 45 , a fitting part 46 , a O -Ring 47 , a fastening part 48 , a connector part 49 and the like.

[0023] The bypass part 45 provides the bypass channels 51 and 52 available. The bypass channels 51 and 52 guide a portion of the air through the intake flow channel 12 flowing intake air into the interior of the housing 41 one. The main bypass channel 51 penetrates the bypass section 45 , and an upstream end section of the main bypass channel 51represents an inlet opening 45a and a downstream end section of the main bypass channel 51 represents a main outlet opening 45b ready. The sub- or sub-bypass channel 52 branches off from an intermediate section of the main bypass channel 51 and is shaped in such a way that it forms the inside of the bypass section. 45 surrounds. The downstream lateral end section of the lower bypass channel. 52 offers a bottom drain opening 45c . Fig. 2 is a view of the airflow meter 14 from the side of the inlet opening 45a as seen.

[0024] The fitting part 46 is a section that runs through the O -Ring 47 into the sensor insertion hole 12b is used. O -Ring 47 is an element for sealing the intake flow channel 12 and the outside of the intake pipe 12a . The O -Ring47 is on the outside of the fitting part 46 mounted and is placed between the fitting part 46 and the sensor insertion hole 12b inserted. The fastening part 48 This is a section for attaching the airflow meter. 14 on the intake manifold 12a in a state in which a main section of the casing 41 into the intake flow channel 12 enters.

[0025] The connector part 49 is a section that surrounds several connections. A plug part is inserted into the connector part. 49 The connector is located at the end of a connecting cable that connects directly or indirectly to the ECU. 15 It is electrically connected, and the plug part fits with the connector part. 49 together.

[0026] The flow detection section 42An example is a thermal flow sensor, which consists of a heat-generating resistor. The flow sensing component 42 is located in the lower bypass channel 52 If the case 41 to the intake pipe 12a is attached, it is bypassed through the bypass channel 51 flowing intake air to the flow sensor section 42 supplied. The flow detection unit(s). 42 It is electrically connected to several terminals located in the connector part 49 are planned. The volume flow measurement section. 42 It provides a sensor signal corresponding to the intake air volume flow and the volume flow through the bypass channel. 51 to the signal processing section 44 The flowing air is output as a volume flow signal. The flow detection section 42 is not limited to the thermal flow sensor and can be an ultrasonic flow sensor or the like.

[0027] The sensor unit 43 is located on one side of the bypass section 45 of the case 41 The sensor unit 43 includes a sensor chip 55 and a chip carrier 56 or chip holder 56 The sensor chip 55 is able to detect temperature and humidity, and the chip carrier 56 carries the sensor chip 55 in one of the bypass sections 45 independent state. The chip carrier 56 extends from the fitting part 46 and is removed from the housing 41 worn. The sensor chip 55 It is located in the inlet or intake flow channel. 12 , by the case 41 on the intake manifold 12a is attached. The chip holder 56 can be integrated with the bypass section 45 be provided for.

[0028] The sensor unit 43 is electrically connected to the connector part 49connected to the provided multiple connections. The sensor unit 43 It gives a sensor signal corresponding to the humidity passing through the intake airflow channel. 12 The flowing intake air is used as a humidity signal. The humidity signal is a digital signal. The humidity signal can also be an analog signal, such as a simple potential. In addition to the humidity signal, the sensor unit outputs... 43 a temperature signal is emitted that corresponds to the temperature of the intake air.

[0029] In the sensor unit 43 is the sensor chip 55 mounted on a sensor substrate and the sensor substrate is in the chip carrier 56 embedded in the Fig. 4 and Fig. 5 sensor chips shown 55 The entire unit is designed as a flat, rectangular prism. The sensor chip 55 includes a chip substrate 61 , an electrode plate 62 , an adhesive material63 , a bond wire 64 and a sealing part 65 .

[0030] The chip substrate 61 It consists of an insulating material, such as silicon, and is shaped like a rectangular prism, which is flat overall. It includes a temperature detection component. 67 and a moisture detection component 68 are located on one side of the chip substrate 61 trained, and these detection parts 67 and 68 are arranged side by side. The temperature detection section 67 It is a temperature sensor for detecting the temperature of a gas, such as intake air. The humidity detection part 68 It is a humidity sensor that measures the relative humidity of a gas such as intake air. The temperature detection part 67 and the moisture detection part 68They output a temperature signal and a humidity signal, corresponding to the temperature and humidity of the intake air, to the signal processing unit. 44 The temperature detection unit 67 can be used directly with the sealing part 65 be covered or exposed to the air.

[0031] The moisture detection part 68 For example, a capacitive humidity sensor measures the capacitance of a moisture-sensitive material that absorbs and dehumidifies moisture from the air through a pair of electrodes that encapsulate the moisture-sensitive material. As a moisture detection component 68 A resistance humidity sensor, a thermal humidity sensor, or the like can be used. The humidity detection part 68 has a detection area 68aon, which comes into contact with the intake air as the detection target, and is located in an orientation in which the detection surface 68a from the chip substrate 61 is exposed.

[0032] The electrode plate 62 is a thin, plate-shaped element made of a conductive material. The electrode plate 62 forms a base surface of the sensor chip 55 On the electrode plate 62 are a chip electrode 62a , a die 62b and trained in the like. The chip electrode 62a is electrically connected to a wiring provided on the sensor board in a state in which the sensor chip 55 is mounted on the sensor substrate.

[0033] The binding material 63 connects the underside of the chip substrate 61 with the matrix support 62b the electrode plate 62 The bond wire 64It is a wire-like element made of a conductive material. The bond wire 64 connects the respective electrodes of the chip substrate 61 intended moisture detection part 68 electrically with the chip probe 62a .

[0034] The sealing part 65 is in close contact with the electrode plate 62 and covers the chip substrate 61 , the bond wire 64 and the like. In the sealing part. 65 is a detection hole 65a provided. The detection hole 65a is a partially conical through-hole that is provided in a position that corresponds to the surface on the top of the chip substrate 61 trained recognition parts 67 and 68 overlaps. The detection hole 65a lays the recognition parts 67 and 68 from the sealing part 65 Free. In the moisture detection section. 68The detection area 68a from the sealing part 65 through the detection opening 65a or through the detection hole 65a exposed.

[0035] The chip carrier 56 It consists of a resin material in a rectangular, thick plate form. The chip carrier 56 covers the sensor chip 55 and the sensor substrate. The chip carrier 56 sets the detection parts 67 and 68 the outside of the chip carrier 56 out. In the chip carrier 56 is a support hole for exposing the detection components 67 and 68 provided for, and the bearing or support hole is connected to the detection hole. 65a of the sensor chip 55 formed in an overlapping position. In the configuration described above, the detection parts can 67 and 68 with the through the intake flow channel 12 (see Fig. 1) through the detection hole 65a and the intake air flowing through the support hole comes into contact with it.

[0036] The in Fig. 6 Signal processing section shown 44 is an electronic circuit that works together with the sensor chip 55 in the air flow meter 14 is included and on the case 41 It is mounted. The flow detection part 42 , the temperature detection part 67 and the moisture detection part 68 are electrically connected to the signal processing section 44 connected, and a flow signal, a temperature signal and a humidity signal are generated by the detection parts. 42 , 67 and 68 entered. The signal processing section. 44 can be on the sensor chip 55 to be installed.

[0037] The signal processing section 44 includes a memory circuit 70 The memory circuit 70It stores a humidity measurement program and an anomaly detection program, thereby enabling the signal processing section 44 It serves as a humidity measuring device for measuring the humidity of the intake air. According to the implementation of the humidity measurement program and the anomaly detection program by the electronic circuit, the signal processing section includes... 44 Functional blocks such as a signal maintenance section 71 , a measurement calculation part 72 , a water droplet identification section 73 and a threshold setting part 74 If the ECU 15 The signal processing section is referred to as the first control device. 44 can be described as a second control device.

[0038] As with the ECU 15 can the signal processing part 44A computing circuit with a processor, a storage medium such as RAM, ROM, and flash memory, a microcomputer with an input and output section, a power supply circuit, and the like. In the above configuration, the storage medium is a non-temporary physical storage medium and is not limited to the ROM and storage medium described above. In the above configuration, the signal processing section can 44 also referred to as SCU (Sensor Control Part).

[0039] The signal maintenance part 71 It receives a flow signal, a temperature signal, a humidity signal, and the like from the flow detection section. 42 , the temperature detection part 67 , the moisture detection part 68 and the like. The measurement calculation part. 72It calculates the measurement result of physical quantities such as flow rate, temperature and humidity of the intake air based on the flow rate signal, the temperature signal, the humidity signal and the like, which is generated by the signal maintenance unit. 71 is obtained. The one with the measurement calculation part. 72 The measured temperature and humidity are stored in the memory circuit. 70 saved.

[0040] The water droplet identification section 73 detected that a water droplet was on the moisture detection part 68 is attached, based on the moisture signal emitted by the moisture detection unit 68 is dispensed. This assumes that a liquid, such as condensation, is present in the intake flow channel. 12 is generated, a water that passes through the intake flow channel. 12 flows, or water that flows with the intake air, past the moisture detection part 68as a water droplet. When the water droplet touches the moisture detection part. 68 If it is attached, a content of the moisture detection part may be present. 68 The humidity signal output may deviate from the actual humidity level of the intake air due to the influence of the water droplet. This means that the accuracy of the humidity measurement by the airflow meter may be affected. 14 is reduced.

[0041] In the present embodiment, it is assumed that a water droplet will reach the moisture detection part. 68 is adhered if the water droplet is even slightly attached to the detection surface. 68a is glued on, and that the water droplet does not reach the moisture detection part. 68 It is stuck when no water droplet touches the detection surface. 68a is glued on.

[0042] Depending on the detection accuracy of the moisture detection unit 68 or similar, it can be assumed that the water droplet reached the moisture detection part. 68 is adhered when the water droplet is on the entire detection surface. 68a is glued on, and that the water droplet does not reach the moisture detection part. 68 is stuck if there is a section where the water droplet does not touch the detection surface even a little bit. 68a is attached. Furthermore, regarding the detection area 68a It can be assumed that the water droplet will reach the moisture detection part. 68 is detected if the area where the water droplet is stuck is larger than a predetermined value, and if the water droplet does not reach the moisture detection part. 68is adhered if the area to which the water droplet is adhered is not larger than the predetermined value.

[0043] The water droplet identification section 73 calculates a first-order differential value RH1 , by performing a first-order differentiation by a time at a humidity RH the measurement calculation part 72 calculated intake air and calculates a second-order differential value. RH2 , by performing a second-order differentiation at a time at the humidity RH carries out. The first-order differential value RH1 is dRH / dt, and the second-order differential value RH2 is d 2 RH / dt 2 The water droplet identification section 73 compares the differential value RH2 second order with predetermined thresholds Q1 , Q2 and Q3and furthermore evaluates the threshold times Tr1 and Tr2 in the comparison result to determine whether the water droplet is at the moisture detection part 68 is attached or not.

[0044] The sensor signals are sent to the ECU. 15 supplied by a vehicle speed sensor, an outside air temperature sensor, an atmospheric pressure sensor, or the like. The ECU 15 It receives at least ambient or environmental information such as outside air temperature and air pressure, as well as vehicle information such as vehicle speed and cumulative distance traveled, based on various sensor signals, and passes this information to the signal processing unit. 44 out of.

[0045] The threshold setting part 74 sets the thresholds Q1 , Q2 and Q3 one. The first threshold Q1is a threshold value that is set to a positive value to determine whether the water droplet complies with the moisture detection part. 68 has taken place or not. The second threshold Q2 is a threshold value that is set to a negative value to determine whether the moisture detection part is connected 68 The third threshold determines whether attached water droplets were eliminated or not. Q3 This is a threshold value used to improve the accuracy of determining whether the water droplet has been contained or not, and to improve the accuracy of determining whether the water droplet has been removed or not. The threshold setting component 74 in addition to the threshold values Q1 until Q3 including the threshold times Tr1 and Tr2 one. The thresholds Q1 until Q3and the threshold time Tr1 , Tr2 for example, based on an initial specification of the moisture detection part. 68 , in particular a variation in the responsiveness of the output, and the like. The first threshold Q1 corresponds to one occurrence threshold, the second threshold Q2 corresponds to a dry threshold and the third threshold Q3 This corresponds to an occurrence inflection value and a dry inflection value. The first threshold time Tr1 corresponds to one occurrence threshold time, and the second threshold time Tr2 corresponds to a drying threshold time.

[0046] The signal processing section 44 Outputs information, including the calculation result of the measurement calculation part. 72 , of the determination result of the water droplet determination part 73 and the like to the ECU 15The calculation result of the measured value calculation part. 72 This includes the humidity RH and the result of the water droplet determination part. 73 It includes water adhesion information that indicates whether the water droplet is attached to the moisture detection part. 68 is attached or not.

[0047] Assuming the vehicle is moving, an adhesion occurrence profile is presented here with reference to the Fig. 7 and Fig. 8 described, which indicates a variation mode of moisture when the adhesion of the water droplet to the moisture detection part 68The data includes a non-adherence profile hb, which indicates a variation mode of the moisture when the water droplet is not adhered. For the adhesion occurrence profile ha, the respective change modes of the first-order differential value RHla and the second-order differential value RH2a are shown; however, for the non-adherence profile hb, the first-order and second-order differential values ​​are not shown.

[0048] The Fig. 7 and Fig. Figure 8 illustrates a change mode in the humidity RH of the adhesion occurrence profile ha when the adhesion of the water droplet to the moisture detection part 68 at a time t10 This occurs, and a change mode in humidity RH of the non-adherence profile hb , if the humidity of the intake air actually changes at that time for comparison t10 changes.

[0049] In the adhesion occurrence profile ha, the adherence or attachment of the water droplet occurs at the time t10 The adherence of the water droplet continues until a certain point in time is reached. t20 further, and the water droplet is removed by drying or the like at the time t20 eliminated. In this case, the water droplet is continuously removed over an adhesion time Ta at the times t10 until t20 The humidity RH of the adhesion occurrence profile ha is maintained at a relatively high value, such as a value close to 100% when the water droplet exhibits adhesion, but in the Fig. 7 and Fig. 8 represents a shorter holding time. In the Fig. 7 and Fig. 8. A temperature changes. TM also before and after that time t10 In other words, the water droplet is dried when the water droplet that touches the moisture detection part... 68adheres, is removed.

[0050] As in Fig. 7 and Fig. As shown in section 8, the differential value is displayed. RH1 first order in an increasing section of the adhesion occurrence profile ha, in which the moisture RH increases, the rate of change of humidity RH increases from the time t10 and the positive and negative ones will be at a certain point in time t13 Conversely, and the differential value RH1 First order begins to sink. At that time t13 There exists an inflection point IPa of the humidity RH of the adhesion occurrence profile ha, and the first-order differential value RH1 reaches a maximum value at time t13 .

[0051] In the adhesion occurrence profile ha, the differential value shows RH2 second order a rate of change of the rate of change of moisture increase from time t10 on, and at that time t12before reaching that point t13 The positive and negative values ​​are inverted, and the differential value RH2 The second-order differential value begins to decrease. RH2 reaches a maximum value at time t12 and then reaches at the time t13 of the inflection point IPa by lowering it to zero. In the present embodiment, zero is defined as the third threshold. Q3 set.

[0052] The inventors in this case have discovered that the moisture RH or the moisture RH the adhesion pattern changes more abruptly than the humidity RH or the moisture RH of the non-adherent profile hb. For example, in an ascending section where the humidity increases RH The adhesion profile increases more strongly than the non-adherence profile. hb According to the above findings, the humidity is rising. RH stronger than a maximum value of the differential value RH2 second order increases more strongly. As in the Fig. 7 and Fig. Figure 8 shows the maximum value of the second-order differential. RH2 of the adhesion occurrence profile ha greater than the maximum value of the second-order differential value RH2 of the non-adherence profile hb In this case, the first threshold will be Q1 set to a value that is in the differential value RH2 second order of the non-adherence profile hb is difficult to achieve and is a second-order differential value RH2 of the adhesion occurrence profile ha is reached, so that the occurrence of water droplet adhesion with the first threshold value Q1 can be recorded as a determining criterion. The first threshold value Q1must be set to a value greater than the maximum value determined by the differential value RH2 second order of the non-adherence profile hb can be achieved, and is smaller than the maximum value determined by the differential value RH2 second order of the adhesion occurrence profile ha can be achieved.

[0053] Furthermore, the inventors in this case have gained the insight that the differential value RH2 second order of the adhesion occurrence profile ha the third threshold Q3 reached earlier than the differential value RH2 second order of the non-adherence profile hb in the increasing proportion of moisture RH . According to the above findings, a flexion period Tb , which are from a time when the differential value RH2 second order to reach the first threshold Q1 increases until a time when the differential value RH2 second order to the third threshold Q3 The duration is shorter in the adhesion profile than in the non-adherence profile. hb In Fig. The differential value reaches 8. RH2 second order the first threshold Q1 at the time t11 , the times t11 until t13 are the inflection times Tb of the adhesion pattern ha and the time points t11 until t14 are the inflection time Tb of the non-adherence profile hb. If the first threshold time Tr1 , which serves as a determining criterion for the inflection time Tb The setting can be achieved by using the first threshold time. Tr1 It must be determined whether the water droplet threshold has been met or not. In this case, the first threshold time must be set. Tr1 be set to a value greater than the maximum time achievable by the inflection time Tb of the adhesion occurrence profile ha and less than a minimum time determined by the inflection time Tb The non-adherence profile hb can be obtained. The first threshold time corresponds to an occurrence threshold time.

[0054] In a falling section of the adhesion occurrence profile ha, where the humidity RH decreases, the differential value decreases. RH1 first order humidity RH from the time t20 and begins at a certain point in time t23 to rise. At the time t23 There exists an inflection point. IMa the moisture RH of the adhesion occurrence profile ha, and the first-order differential value RH1 reaches the minimum value at time t23 If the humidity RH limited to the falling part of the humidity RH, reaches an absolute value of the first-order differential value. RH1 the maximum value at time t23 .

[0055] The differential value RH2 second order of the adhesion occurrence profile ha decreases from the time t20 and rises at that time t22 before the time t23 is achieved. The second-order differential value RH2 reaches the minimum value at time t22 and then reaches at the time t23 of the inflection point IMa by raising the third threshold Q3 An absolute value of the second-order differential value RH2 reaches its maximum value at time t22 only in the falling section of the adhesion occurrence profile ha.

[0056] In the falling section, where the humidity RH As the humidity decreases, the adhesion profile ha decreases more sharply than the non-adhesion profile hb. According to the findings of the inventors present above, the humidity decreases RH more strongly, since the minimum value of the differential value RH2 second order is smaller. As in the Fig. 7 and Fig. Figure 8 shows the minimum value of the second-order differential. RH2 of the adhesion occurrence profile ha smaller than the minimum value of the second-order differential value RH2 of the non-adherence profile hb. Since in this case the second threshold Q2 is set to a value that is in the differential value RH2 second order of the non-adherence profile hb is difficult to achieve and is expressed as a second order differential value RH2 Once the adhesion occurrence profile ha is reached, the elimination of water droplets can be achieved with the second threshold. Q2 be recorded as a determining criterion. The second threshold Q2 must be set to a value that is smaller than the minimum value determined by the differential value RH2 second order of the non-adherence profile hb can be achieved, and greater than the minimum value determined by the differential value RH2 second order of the adhesion occurrence profile ha can be achieved.

[0057] Furthermore, the inventors in this case have gained the insight that the differential value RH2 second order of the adhesion occurrence profile ha the third threshold Q3 reached earlier than the differential value RH2 second order of the non-adherence profile hb in the falling part of the humidity RH Based on the above information, the required inflection time is Tc similar to the inflection period Tb from a time in which the differential value RH2 second order decreases and the second threshold Q2 reached, up to a time when the differential value RH2 second order threshold Q3achieved, in the adhesion profile ha shorter than in the non-adherence profile hb. In Fig. The second-order differential value reaches 8 RH2 the second threshold Q2 at the time t21 , and the times t21 until t23 The inflection times Tc of the adhesion occurrence profile ha are... If the second threshold time... Tr2 , which serves as a reference for determining the inflection time Tc The setting can be adjusted by using the second threshold time. Tr2 It must be determined whether the water droplet has been removed or not. In this case, the second threshold time must be set. Tr2 be set to a value greater than the maximum time achievable by the inflection time Tc of the adhesion occurrence profile ha and less than a minimum time determined by the flexion time Tc The non-adherence profile hb can be obtained. The second threshold time Tr2This corresponds to a drying threshold time.

[0058] Furthermore, by comparing the differential value RH1 first order with predefined thresholds P1 and P2 It will be determined whether water droplets are present on the moisture detection part. 68 Whether or not they adhere. More precisely, in the increasing proportion of moisture. RH The maximum value of the first-order differential value will be RH1 , which is a rate of change, is greater in the adhesion occurrence profile ha than in the non-adherence profile hb. The upper threshold P1 is a threshold value set to a positive value to determine whether the water drop count has been met or not. In this case, the upper threshold must be exceeded. P1 be set to a value greater than the maximum value determined by the differential value RH1 first order of the non-adherence profile hb can be achieved, and is smaller than the maximum value that can be determined by the differential value RH1 The first order of the adhesion occurrence profile can be achieved.

[0059] In the falling part of the humidity RH is the maximum value of the first-order differential value RH1 In the adhesion profile ha, the value is smaller than in the non-adherence profile hb. A lower threshold value P2 This is a threshold value set to a negative value to determine whether the water droplets have been removed or not. In this case, the lower threshold must be... P2 to be set to a value that is smaller than the minimum value determined by the differential value RH1 The lower threshold can be reached by the first-order non-adherence profile hb and is greater than the minimum value that can be reached by the first-order differential of the adhesion occurrence profile ha. For example, the lower threshold P2 set to a negative value that has the same absolute value as the upper threshold P1 exhibits.

[0060] In the signal processing section 44 The water droplet determination section leads 73 A water droplet determination procedure is performed to determine whether the water droplet is at the moisture detection part. 68 Whether or not it is liable. The water droplet determination process is repeated using a predetermined cycle. This water droplet determination process is described in a flowchart. Fig. 9 described.

[0061] In the signal processing section 44 The threshold setting part 74the thresholds Q1 until Q3 and the threshold time Tr1 , Tr2 based on environmental and vehicle information. For example, the responsiveness of the moisture detection unit. 68 or similar factors such as aging or deterioration may reduce the steepness of the slope derived from the measurement calculation part. 72 calculated change in humidity RH It will gradually decrease. Therefore, it is assumed that the responsiveness of the moisture detection section will increase. 68 and similar information tends to decrease with increasing cumulative mileage in the vehicle information, and the first threshold Q1 is reduced to a smaller value and the third threshold Q3 It is set to a larger value as the cumulative distance traveled continues to increase. This prevents the occurrence of a situation in which the differential value RH2 the moisture RH the second order thresholds Q1 and Q3 despite the occurrence of water droplets adhering to the moisture detection part 68 not achieved due to the aging of the moisture detection component 68 prevented. The threshold setting part 74 It initially sets a positive value, calculated based on environmental and vehicle information, as the first threshold. Q1 and sets the second threshold Q2 corresponding to the first threshold Q1 For example, a negative value is assigned the same absolute value as the first threshold. Q1 as a second threshold Q2 set.

[0062] In Fig. 9, in step S101 , is derived from the measurement calculation part 72 calculated humidity RH received. In step S102The first-order differential value RH1 calculated by first-order differentiation for humidity RH is carried out, and in step S103 The second-order differential value RH2 calculated by using second-order differentiation for humidity RH is carried out in step S104 It is determined whether the water droplet is at the moisture detection part. 68 Whether or not it is liable is determined, for example, whether the memory circuit 70 or a similar flag is set indicating whether or not the water droplet has adhered. If it is determined that the water droplet is not adhering, the procedure continues with step S105 to determine if the water droplet is at the moisture detection part 68 liable or not.

[0063] In step S105 is determined whether the differential value RH2 The second-order threshold becomes larger than the first threshold. Q1 If the water droplet does not grow larger, the water droplet determination process is aborted, as no water droplet is detected by the moisture detection unit. 68 adheres. If the droplet size increases, the process continues with step S106 proceeding, assuming there is a possibility that the droplet has adhered. The function of executing the processing step S105 This corresponds to an adhesion determination component and an occurrence determination component. For example, in the case of moisture... RH of the in the Fig. 7 and Fig. The adhesion pattern shown in section 8 determines the stage. S105 at that time t11 confirmed, to which the second-order differential value on the first threshold value Q1 increases, and the process moves to stage S106 above.

[0064] In the steps S106 until S108 is determined whether the second-order differential value RH2 smaller than the threshold Q has become immediately after the second-order differential value RH2 greater than the first threshold Q1 has become or not. More precisely, in step S106 determines whether an elapsed time is derived from a time in which the differential value RH2 The second-order threshold becomes larger than the first threshold. Q1 , is even shorter than the first threshold time Tr1 If the elapsed time is not already shorter than the first threshold time Tr1 was, it is determined that the differential value RH2 second order is not rapidly reduced, and the process continues step by step S110 continued. The function of executing the processing of step S106corresponds to an adhesion determination part and an occurrence time determination part.

[0065] If the elapsed time is even shorter than the first threshold time Tr1 , the procedure continues step by step S107 further, where the humidity RH is maintained and the differential value RH2 second order is calculated in the same way as in step S101 and S103 The function of executing the processing of the steps S103 and S107 This corresponds to a second-order calculation part. In step S108 will determine whether the step S107 calculated differential value RH2 second order smaller than the third threshold Q3 will or will not. If the differential value RH2 second order not smaller than the threshold Q3 is, the processing of the steps will S106 until S108repeated until the elapsed time equals the first threshold time Tr1 achieved. The function of executing step S108 corresponds to an attachment determination part and an occurrence inflection determination part.

[0066] If the differential value RH2 second order at a stage where the elapsed time is the first threshold time Tr1 not reached, less than the threshold Q3 It is determined that the adhesion of the water droplet to the moisture detection part 68 has taken place, and the process continues to step S109 In step S109A processing procedure is implemented to counteract the occurrence of water droplet adhesion by addressing the presence of water droplets. This processing includes, for example, fail-safe processing. In this fail-safe processing, the equivalent moisture content is retrieved from the memory circuit as fail-safe data. 70 The humidity was read out and the replacement humidity was included in the humidity information sent to the ECU. 15 is output instead of the value from the measurement calculation part. 72 calculated humidity RH This fail-safe process continues until no more water droplets remain on the moisture detection part. 68 liable.

[0067] The replacement moisture content is a predetermined value, such as 80%. RH , which was previously in the memory circuit 70was stored. The substitute humidity can be a value that is set each time according to the situation at that time. In other words, the substitute humidity is not necessarily the preset value. For example, the relative humidity (RH) in the past can be used as the substitute humidity for a predetermined time (e.g., 1 minute), based on a point in time at which the differential value RH2 The second-order threshold becomes larger than the first threshold. Q1 The past humidity RH is stored in the storage circuit. 70 stored and from the memory circuit 70 The reading was taken out. It is assumed that the possibility of the replacement humidity differing significantly from the current actual humidity is low.

[0068] In step S109 The processing also includes setting a flag or indicator that indicates that water droplets have reached the moisture detection part. 68in the memory circuit 70 or similar. The above processing is used to determine step S104 Confirmation is given when the water droplets have already adhered. In the case of, for example, the humidity RH of the in the Fig. 7 and Fig. The confirmation of the adhesion pattern shown in step 8 occurs during the determination of step 1. S108 at that time t13 , to which the differential value RH2 second order decreases and the third threshold Q3 reached, and the process proceeds to step S109 above.

[0069] If, on the other hand, the differential value RH2 second order the third threshold Q3 does not fall below the first threshold time before the elapsed time Tr1 Once reached, the process continues step by step S110continues and performs temporary or intermittent water droplet processing, as there is a possibility that the water droplets did not adhere. In this example, it is assumed that, for example, the first threshold Q1 as an example of the reason why the second-order differential value is too small RH2 within the first threshold period Tr1 not less than the third threshold Q3 will be, although the second-order differential value RH2 greater than the first threshold Q1 will be. In this case, the differential value will be RH2 second order, although no water droplet is present at the moisture detection part 68 adheres, due to an actual change in humidity greater than the first threshold value Q1 .

[0070] Therefore, the threshold setting part is used as a temporary processing step for the water droplet. 74caused the processing of the update of the first threshold to begin. Q1 to perform a calculation that is larger by a predetermined amount. This prevents the differential value from being calculated. RH2 The second order becomes a value that is greater than the first threshold. Q1 This happens even though there is no water droplet on the moisture detection part. 68 The specified value is, for example, a value of several percent of the first threshold. Q1 and is pre-installed in the memory circuit 70 stored. After the temporary processing of the water droplet, it is determined that the moisture detection part complies with the requirements. 68 The determination of the water droplet has not been carried out, and the processing of the water droplet determination is terminated.

[0071] If in step S104 It is determined that water droplets have already reached the moisture detection part. 68The process continues step by step. S115 to determine whether the adhering water droplets are no longer present or not. In step S115 is determined whether the differential value RH2 second order smaller than the second threshold Q2 will be lost or not. If the water droplets have not been reduced, the current processing of the water droplet determination is aborted because the water droplets are not lost; if the water droplets have been reduced, it is assumed that the water droplets may be lost, and the process proceeds to step S116 about. The function of executing the processing of step S115 This corresponds to an adhesion determination part and a dryness determination part. For example, regarding moisture. RH of the in the Fig. 7 and Fig. The adhesion pattern shown in section 8 determines the stage. S115 at that timet21 confirmed, to which the differential value RH2 second order decreases and the second threshold Q2 reached, and the process proceeds to stage S116 above.

[0072] In the steps S116 until S118 is determined whether the second-order differential value RH2 smaller than the second threshold Q2 and then quickly exceeding the third threshold Q3 has become or not. In particular, in step S116 determines whether the elapsed time after falling below the second-order differential value RH2 becomes smaller than the second threshold Q2 and is even smaller than the second threshold time Tr2 If the elapsed time is not shorter than the second threshold time Tr2 is, it is determined that the differential value RH2 second order is not rapidly reduced, and the process continues step by stepS120 continued. The function of executing the processing of step S116 This corresponds to an adhesion determination part and a drying time determination part.

[0073] If the elapsed time is even shorter than the second threshold time Tr2 , the procedure continues step by step S117 away, where the moisture RH is obtained and the differential value RH2 second order is calculated in the same way as in step S107 The function of executing the procedure or procedure step of step S117 This corresponds to a second-order calculation part. In step S118 will determine whether the step S117 calculated differential value RH2 second order greater than the third threshold Q3 will or will not. If the differential value RH2 second order not greater than the threshold Q3 is, the processing of the steps willS116 until S118 repeated until the elapsed time equals the second threshold time Tr2 achieved. The function of executing the processing of step S118 corresponds to an adhesion determination part and a dry flexion determination part.

[0074] If the differential value RH2 second order at a stage where the elapsed time is the second threshold time Tr2 not reached, becomes larger than the third threshold Q3 , is determined to show that the water droplet adheres to the moisture detection part 68 has taken place, and the process continues to step S119 In step S119 A recovery process is performed to terminate processing related to the participation of water droplets, such as fail-safe processing. During the recovery process, the data sent to the ECU is... 15The humidity information provided is not included in the substitute humidity information, but rather the information from the measurement calculation part is used. 72 The calculated relative humidity (RH) is incorporated into the humidity information. As a result, the ECU controls... 15 the operation of the internal combustion engine 11 in accordance with any humidity level RH .

[0075] On the other hand, if the differential value RH2 second order does not exceed the threshold value Q3 , before the elapsed time becomes the second threshold time Tr2 Once this is achieved, it is assumed that there is a possibility that the water droplet will not be lost, and the process continues to step S120 , and the temporary recovery processing is performed. In this example, it is assumed that, for example, the second threshold Q2as an example of the reason why the second-order differential value is too large RH2 within the second threshold period Tr2 not greater than the third threshold Q3 will be, although the second-order differential value RH2 smaller than the second threshold Q2 will be. In this case, the differential value will be RH2 second order due to a defect or similar in the humidity RH smaller than the second threshold Q2 , although the moisture detection part 68 Adhering water droplets are not completely removed.

[0076] Therefore, the threshold setting part 74 caused the processing of the update of the second threshold to begin. Q2 to perform the temporary recovery processing on a value that is smaller by a predetermined amount. This prevents the differential value from being used. RH2 The second-order threshold becomes smaller than the second threshold. Q2 , although the water droplet is not eliminated. The specified value is, for example, a value of several percent of the second threshold. Q2 and is pre-installed in the memory circuit 70 saved. Furthermore, after the temporary processing of the restoration, it is determined that no water droplets are removed, and the current processing of the water droplet determination is terminated.

[0077] Determining whether the water droplet reaches the moisture detection part 68 Whether or not it is attached can be seen as a determination of whether an anomaly occurs in which the water droplet touches the moisture detection part. 68 is attached or not. In this case, the signal processing part can 44 also referred to as an anomaly detection device, which detects whether an anomaly exists in the moisture detection section. 68has occurred or not.

[0078] Since the differential value RH2 The second-order humidity RH is used to determine whether the water droplet is at the moisture detection part. 68 Whether it is attached or not, it is not necessary to wait until a point in time is measured at which the moisture content is low. RH is kept at a value close to 100%. Furthermore, the differential value requires RH2 For the second order, the time to reach the maximum value due to the occurrence of the adherence of the water droplet, and the time to reach the minimum value due to the removal of the adhering water droplet, is shorter than that of the differential value. RH1 First order. This also allows the responsiveness of the determination regarding the water droplet's compliance with the moisture detection element to be determined. 68 to improve while maintaining the correct determination accuracy.

[0079] As in the Fig. 7 and Fig. As shown in 8, the time is t12 , where the differential value RH2 The second order reached its maximum value before the time t13 , where the differential value RH1 First order, the maximum value in the increasing proportion of moisture RH This is achieved when the water droplet adheres to the moisture detection part. 68 occurs. Because the first-order differential value RH1 The humidity reaches an inflection point IPa. RH the maximum value, while the second-order differential value RH2 the maximum value in a phase before the inflection point IPa the moisture RH achieved. For this reason, in the configuration where the determination of whether the water droplet has been compliant or not is made using the second-order differential value, RH2 As implemented in the present embodiment, the occurrence of the water droplet compliance is detected at an earlier time than in the configuration where the water droplet compliance is detected using the first-order differential value. RH1 is carried out.

[0080] Similarly, when the adhering water droplet is eliminated, the time is t22 , where the differential value RH2 of the second order reaches its minimum value earlier than the time t23 , where the differential value RH1 of the first order the minimum value at a falling part of the humidity RH achieved. Because the first-order differential value RH1 The minimum value is reached at an inflection point IMa of the humidity. RH , while the second-order differential value RH2 the minimum value in a phase before the inflection point IMa the moisture RH This is achieved. For this reason, in the configuration where the determination of whether the water droplets have been eliminated or not is made using the second-order differential value, RH2 As carried out in the present embodiment, the elimination of the water droplets is detected at an earlier time than in the configuration where the determination is made using the first-order differential value. RH1 is carried out.

[0081] According to the present embodiment, it is determined whether the differential value RH2 second order greater than the first threshold Q1 is or is not, which allows it to be detected that the water droplets are on the moisture detection part. 68 are attached. In addition, the first threshold will be Q1 set to a small value, which is determined by the differential value RH2 second order of moisture RH This is hardly achieved if the water droplet resistance is not maintained, such as with the non-adherence profile hb. For this reason, a situation in which water droplets adhere to the moisture detection element can be prevented. 68 does not occur, although the differential value RH2 The second-order threshold becomes larger than the first threshold. Q1 .

[0082] If an anomaly occurs in the moisture detection section 68 or similar occurs, or if the water droplet does not actually reach the moisture detection part 68 The differential value is reached when the differential value is applied. RH2 second order does not necessarily have to meet the first threshold Q1 . On the other hand, according to the present embodiment, even if the differential value RH2 second order to the first threshold Q1 The increase determines whether the differential value RH2 second order to the third threshold Q3This reduces the likelihood of an incorrect determination of the occurrence of water droplet adhesion to the moisture detection part. 68 This prevents the water droplets from adhering to the moisture detection element. Therefore, the accuracy of determining whether the water droplets are adhering to the moisture detection part can be affected. 68 Whether or not it has taken place can be improved.

[0083] According to the present embodiment, it is determined whether the differential value RH2 second order to the first threshold Q1 and then within the first threshold period Tr1 to the third threshold Q3 has increased or not. For this reason, even if the differential value RH2 second order to the first threshold Q1 increases even though no water droplet reaches the moisture detection part 68 The erroneous determination that the water droplet was attached to the moisture detection part was incorrect. 68was attached, prevented. Because it is difficult to determine the differential value. RH2 second order within the first threshold time Tr1 to the third threshold Q3 to lower if no water droplet could adhere to it.

[0084] According to the present embodiment, after the water droplet adheres to the moisture detection part 68 determines whether the differential value RH2 second order smaller than the second threshold Q2 Whether or not it is present, which allows the detection of whether the adhering water droplet is no longer there. Furthermore, the second threshold is... Q2 set to a value determined by the differential value RH2 second order of moisture RH This is unlikely to be achieved if the water droplet is not adhered to, such as with the non-adherent profile hb. This can prevent the water droplet from being removed, even though the differential value RH2 second order smaller than the second threshold Q2 becomes.

[0085] The differential value RH2 The second order does not necessarily reach the second threshold. Q2 , if an anomaly occurs in the moisture detection section 68 or similar occurs, or if the moisture detection part 68 Adhering water droplets are not actually removed, or the like. On the other hand, according to the present embodiment, it is determined whether the differential value RH2 second order to the third threshold Q3 whether or not the differential value increases RH2 second order to the second thresholdQ2 This prevents an erroneous determination of the removal of adhering water droplets. Therefore, the accuracy of the determination of whether the moisture detection part is affected can be improved. 68 Whether adhering water droplets were eliminated or not can be improved.

[0086] According to the present embodiment, it is determined whether the differential value RH2 second order to the second threshold Q2 and then within the second threshold period Tr2 to the third threshold Q3 has decreased or not. For this reason, even if the differential value RH2 second order to the second threshold Q2 decreases, although the moisture detection part 68 The fact that the adhering water droplets are not removed prevents an erroneous determination that the water droplet is not removed. This is because the differential value RH2 second order increases within the second threshold time Tr2 not easily reached the third threshold Q3 on, if the water droplet is not eliminated.

[0087] According to the present embodiment, the signal processing part includes 44 of the airflow meter 14 both the measured value calculation part 72 as well as the water droplet identification section 73 For this reason, the humidity information, including that from the measurement calculation part, must be 72 The calculated humidity RH should not be applied to the outside of the airflow meter. 14 be delivered before the moisture information for determination by the water droplet determination part 73 is used. Since the signal processing part 44 the storage circuit 70 exhibits, it is not necessary to obtain various pieces of information from the memory circuit. 70to be read out, on the outside of the airflow meter 14 to be issued before the water drop determination part 73 the information used for determination. This eliminates the possibility that noise, such as interference, could intrude on various types of information used for determination by the water droplet determination component. 73 The accuracy of the respective determinations regarding whether the water droplet adheres to the moisture detection part can be reduced. 68 The situation regarding whether the water droplet has been removed or not can be improved.

[0088] According to the present embodiment, the moisture detection part 68 in the air flow meter 14 contained. For this reason, the moisture RH , which determines the detection result of the moisture detection part 68 is, via the connector part 49connected connecting line together with the flow rate, which determines the detection result of the flow detection part 42 is, and the temperature, which determines the detection result of the temperature detection part 67 is, to the ECU 15 The output will be displayed. As described above, the humidity detection function, the flow detection function, and the temperature detection function are integrated into the air flow meter. 14 integrated, which allows for a reduction in the number of connection cables compared to a configuration where, for example, the moisture detection part is integrated 68 separate from the airflow meter 14 is intended. Since the connector part 49 and the like through the moisture detection section 68 , the flow detection part 42 and the temperature detection section 67 Furthermore, cost reductions can be achieved by sharing resources. (Second embodiment)

[0089] In the first embodiment, only the differential value is used. RH2 The second order of humidity RH is used to determine whether the water droplet is at the moisture detection part. 68 is attached or not, but the first-order differential value RH1 and the second-order differential value RH2 can be combined when used together. In the second embodiment, as in Fig. 10 represents a first-order differential value RH1 used both for determining whether a water droplet adheres to a moisture detection part 68 whether or not it has occurred, as well as for a determination of whether the moisture detection part 68 Whether or not the adhering water droplets were eliminated.

[0090] In Fig. The steps will be 10 S205 and S215 instead of the steps S105 andS115 the first embodiment. In step S205 is determined whether the differential value RH1 first order humidity RH greater than an upper threshold P1 It will or will not. As described above, the upper threshold will be P1 set to a value greater than a maximum value determined by the differential value RH1 first order of a in Fig. 7 shown non-adherence profile hb is achievable, and smaller than a maximum value determined by the differential value RH1 The first order of an adhesion occurrence profile ha is achievable. Therefore, if the differential value RH1 The first order value becomes greater than the upper threshold. P1 , it is determined that there is a possibility that compliance with the water droplet has occurred, and the procedure continues with step S106 gone. If, on the other hand, the differential value RH1 If the first-order value is not greater than the upper threshold PI, it is determined that compliance with the water drop test has not occurred, and the current processing of the water drop test is terminated.

[0091] Here, in the increasing proportion of humidity RH, as in Fig. 7 shown, after the second-order differential value RH2 Once the maximum value is reached, the first-order differential value reaches its maximum value. RH1 the maximum value, and the second-order differential value RH2 falls to the threshold of the third Q3. Therefore, if the upper threshold P1 to a value smaller than the maximum value of the first-order differential RH1 When adjusted, the second-order differential value decreases. RH2 to the third threshold Q3 , after the first-order differential value RH1 to the upper threshold P1 has increased. Therefore, even if step S205instead of step S105 The accuracy of determining whether the water droplet has been adhered to or not can be increased by determining whether the differential value RH2 The second-order threshold has become larger than the first threshold. Q1 in step S106 .

[0092] Regarding the decreasing proportion of humidity RH, as in Fig. 7 shown, reached after the differential value RH2 The second order reaches its minimum value, the differential value RH1 first order the minimum value and the differential value RH2 drops to the third threshold Q3 Therefore, if the lower threshold P2 is set to a value greater than the minimum value of the first-order differential. RH1 If the differential value is increased, the second-order differential value increases. RH2 to the third threshold Q3 , after the first-order differential value RH1 to the lower threshold P2 has decreased. Therefore, in step S116 , even if step S215 instead of step S115 The execution determines whether the differential value RH2 The second-order threshold becomes smaller than the second threshold. Q2 , which can improve the accuracy of determining whether the moisture detection part 68 Whether or not the adhering water droplets were eliminated. (Third embodiment)

[0093] In the first embodiment described above, the determination of whether the water droplet reaches the moisture detection part is 68 whether it is attached or not, is determined by the signal processing section. 44 of the airflow meter 14 carried out, but in a third embodiment the determination is carried out by an ECU 15 performed. In this case, the ECU performs 15, which is a control device for the internal combustion engine 11 is the processing of the water droplet determination.

[0094] In the present embodiment, as in Fig. As shown in 11, the ECU includes 15 instead of the airflow meter 14 a memory circuit 70 , a signal maintenance component 71 , a measurement calculation part 72 , a water droplet identification section 73 and a threshold setting part 74 In the above configuration, the airflow meter indicates 14 no signal processing section 44 on, and various signals from a flow detection part 42 , a temperature detection component 67 and a moisture detection component 68 are integrated into the ECU 15 entered without the signal processing section 44 to pass. In addition to the signals from the detection components. 42 , 67 and68 will be sent to the ECU 15 various signals from measuring components such as an intake air temperature sensor 25 etc. supplied to the ECU 15 The measurement calculation part calculates various numerical values. 72 based on various types of signals input from the measuring unit, and uses these numerical values ​​as parameters to perform engine control, such as adjusting the throttle valve opening degree. 21 .

[0095] The ECU 15 Parameter processing is used to adjust the measured humidity RH using a detection signal from the humidity detection unit. 68 to one of the parameters for carrying out the engine control. The above parameter processing is performed repeatedly in a predefined cycle. The above parameter processing is illustrated by a flowchart in Fig. 12 described.

[0096] In Fig. Step 12 leads to S301 until S304 the same processing as in step S101 until S104 according to the first embodiment. In this example, step S301 not those from the measurement calculation part 72 calculated humidity RH , but calculates the humidity RH based on the humidity signal input from the humidity detection section 68 In this case, the measurement calculation part performs the following: 72 the step S301 out, and the function of executing the processing of the step S301 This corresponds to a moisture retention component. The function of the execution of the processing step S303 corresponds to a second-order calculation part.

[0097] If in step S304 It is determined that no water droplet is present on the moisture detection part. 68 liable, the procedure continues step by step S305Furthermore, the relative humidity (RH) is set as one of the parameters for motor control. The above processing is carried out in such a way that the humidity RH Each time, the content of the engine control unit is reflected in the process. The function of executing the processing step S305 This corresponds to a parameter setting section.

[0098] In step S306 will be similar to step S105 the above embodiment determines whether the differential value RH2 second order greater than the first threshold Q1 is or is not. The function of executing the processing of step S306 This corresponds to an adhesion determination part. Furthermore, even if the same processing as in step [number] is not used, the process will still be the same. S107 and S108 according to the first embodiment, it is simply determined whether the differential value RH2 second order to the first threshold Q1has risen or not, which determines whether the water droplet reaches the moisture detection part. 68 was attached or not. If the differential value RH2 second order not greater than the first threshold Q1 If the differential value is [value missing], it is determined that water droplet adhesion did not occur, and the current parameter procedure is terminated. On the other hand, if the differential value [value missing] RH2 The second-order threshold becomes larger than the first threshold. Q1 , it is determined that water droplet adhesion has taken place, and the process continues with step S307 on.

[0099] In step S307 The substitute processing is performed. During the substitute processing, as described in step S109 In the first embodiment, a substitute humidity is used as one of the parameters for controlling the motor instead of the one in step S101 calculated humidity RH set. Similar to the first embodiment, a substitute humidity has a predetermined value and is stored in the memory circuit. 70 stored as error- and failure-proof data. Furthermore, the humidity can be... RH in the past, used as substitute moisture for a predetermined period, based on a point in time at which the differential value RH2 The second-order threshold becomes larger than the first threshold. Q1 Since in this case it is assumed that the possibility of the replacement humidity differing significantly from the current humidity is low, it is possible to prevent the operating condition and fuel consumption of the combustion engine from being affected. 11 The engine control, which uses substitute moisture as one of its parameters, can be extremely degraded. The function of executing the processing step... S307 corresponds to a replacement adjustment part.

[0100] If in step S304 It is determined that the water droplet has already reached the moisture detection part. 68 The procedure, which was attached, proceeds step by step S316 to determine whether the attached water droplet is no longer present or not. In step S316 will be similar to step S115 of the first embodiment determines whether the differential value RH2 second order smaller than the second threshold Q2 is or is not. If the differential value RH2 second order not smaller than the second threshold Q2 If the parameter processing is aborted, it is determined that the water droplet was not removed, and if the differential value RH2 second order smaller than the second threshold Q2 If the water droplet has been removed, the procedure proceeds to step 1. S317about. The function of executing the processing of step S316 corresponds to an adhesion determination part.

[0101] In step S317 The recovery processing will be performed in the same way as in step S119 of the first embodiment. In the recovery process, the replacement processing is terminated, the moisture RH Each time, the motor control is set to one of the parameters instead of the substitute humidity. This ensures that the motor control uses the humidity level in each instance. RH carried out.

[0102] In parameter processing, the processing of the steps corresponds to... S301 until S304 , S306 and S316 The processing of the water droplet determination. The function of executing the processing of the water droplet determination in the ECU. 15 This corresponds to a humidity measuring device. The ECU 15It corresponds not only to a control device, but also to a moisture measuring device and an anomaly detection device.

[0103] According to the present embodiment, the ECU includes 15 a measurement calculation part 72 , a water droplet identification section 73 and the like. For this reason, it is in contrast to the configuration in which the airflow meter 14 the measured value calculation part 72 and the water droplet identification section 73 includes, but is not required, the airflow meter 14 as a control device, an electronic circuit such as the signal processing part 44 to add. In the ECU 15 The functions of the measurement calculation part can 72 , the water droplet determination section 73 and the like by additionally storing various programs in the memory circuit 70It can be easily added, thus reducing the increase in cost burden. Since the ECU 15 the memory circuit 70 Furthermore, various pieces of information from the memory circuit must be present. 70 were read, not on the outside of the ECU 15 be output before the data for determination by the water drop determination part 73 can be used. For this reason, the possibility that noise or disturbances, such as interference, may intrude on various pieces of information used for the determination by the water droplet determination component can be considered. 73 The accuracy of the respective determinations regarding whether the water droplet adheres to the moisture detection part can be reduced. 68 The situation regarding whether the water droplet has been removed or not can be improved. (Other embodiments)

[0104] Although a plurality of embodiments have been described above in accordance with the present disclosure, the present disclosure is not to be construed as being limited to the embodiments mentioned above and may be applied to various embodiments and combinations to an extent that does not deviate from the spirit of the present disclosure.

[0105] As modification 1, the airflow meter can be 14 in the first embodiment next to the temperature detection part 67 also another temperature detection component 81 include. If these temperature detection components 67 and 81 on a first temperature detection part 67 and a second temperature detection unit 81 The second temperature detection part refers to 81 the same configuration as the first temperature detection part 67and is located, for example, at the upstream end section of the housing. 41 , as in Fig. 13. If the water droplet determination method determines that no water droplet is present on the moisture detection part. 68 The signal processing section is liable. 44 the temperature using the temperature signal from the first temperature detection part 67 and sends the temperature information corresponding to the temperature information to the ECU. 15 off. On the other hand, if it is determined that the water droplet is at the moisture detection part. 68 It is determined that the water droplet is also attached to the temperature detection part. 67 The temperature is determined using the temperature signal from the second temperature detection part. 81 The calculation is performed and the temperature information corresponding to the temperature is sent to the ECU. 15is output. In other words, in the engine control unit (ECU). 15 The detection value of the first temperature detection section will not be used. 67 , but the detection value of the second temperature detection part 91 set as a parameter.

[0106] In the first embodiment, as described above, both the first temperature detection part 67 as well as the moisture detection part 68 on a chip substrate 61 in the sensor unit 43 formed. For this reason, when the water droplet lands on the chip substrate 61 If the water droplet adheres, it is assumed that there is a high probability that it will pass over the first temperature detection part. 67 and the moisture detection part 68 is laid.

[0107] Furthermore, it can be determined whether the water droplet reaches the first temperature detection part. 67was attached or not, based on a temperature change mode that is based on the detection signal of the first temperature detection part. 67 was calculated.

[0108] As modification 2, the air flow meter may 14 according to the first embodiment of the temperature detection part 67 and the moisture detection part 68 in a sensor chip 55 not provided for. For example, as in the Fig. 14 and Fig. Figure 15 shows only the moisture detection part. 68 on the chip substrate 61 of the sensor chip 55 and the temperature detection part 67 in a different position than that of the sensor chip 55 in the chip carrier 56 arranged. In this case, the sensor unit 43 the temperature detection part 67 in one of the sensor chip 55 independent state.

[0109] Modification 3 can be applied to the differential value RH2 second order according to the first embodiment, a determining criterion to confirm that the water droplet is at the moisture detection part 68 was complied with, and a criterion for confirming that the water droplet was removed is set to values ​​that are not the third threshold. Q3 are. For example, in step S108 , after the differential value RH2 second order greater than the first threshold Q1 The determining criterion is set to a positive value greater than zero and it is determined whether the differential value RH2 The second order has either dropped to a positive value or it hasn't. In step S118 , after the differential value RH2 second order smaller than the threshold Q2If the determining criterion is set to a negative value less than zero, it is determined whether the differential value RH2 The second order has risen to a negative value or not.

[0110] As modification 4, the measured value calculation part may 72 of the signal processing section 44 the moisture RH In the first to third embodiments, the moisture signal cannot be calculated. In this example, the moisture signal from the moisture detection section can be calculated. 68The humidity signal can be subjected to second-order time differentiation to calculate a second-order differential value. Alternatively, the humidity signal can simply be converted into a numerical value, and this numerical value can then be subjected to second-order time differentiation to calculate a second-order differential value. Even in these cases, the first to third thresholds, the first threshold time, and the second threshold time for the second-order differential value are set and configured to determine whether the second-order differential value has reached these thresholds.In other words, the occurrence threshold, the dry threshold, the occurrence flexion value, the dry flexion value, the occurrence threshold time, and the dry threshold time are set for the second-order differential value and configured to determine whether the water droplet reaches the moisture detection part. 68 Whether or not compliance was observed.

[0111] As modification 5, the threshold setting part can be 74 in the first to third embodiments, the value of the second threshold. Q2 regardless of the value of the first threshold Q1 Adjust. For example, the threshold setting part can be adjusted. 74 the first threshold Q1 and the second threshold Q2 individually adjustable based on environmental information or vehicle information and the second threshold Q2 and the first threshold Q1based on the value of the second threshold Q2 adjust. The threshold adjustment part 74 can reach the first threshold Q1 and the second threshold Q2 set to different values.

[0112] As modification 6, in the first to third embodiments the first to third threshold values ​​may Q1 until Q3 not through the threshold setting part 74 The thresholds cannot be fixed, but can be determined in advance through an experiment, a simulation, or similar methods. In this case, the first to third thresholds are determined. Q1 until Q3 in advance in the memory circuit 70 stored. The same applies to the threshold values. P1 and P2 and the threshold times Tr1 and r2 .

[0113] As modification 7, the water droplet determination part can be 73The corresponding configuration can be implemented using software and hardware that differs from those of the first to third embodiments, or through a combination of software and hardware. Furthermore, the functions of the water droplet detection section can be modified. 73 and the like through the calculation processing circuits of the signal processing section 44 , of the ECU 15 and similar projects can be realized in cooperation. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 201715284

[0001] WO 2015 / 87644 A1

[0004]

Claims

[1] Humidity measuring device configured to measure the moisture content of a gas, the humidity measuring device comprising the following: a second-order computation part (S103, S107, S117, S303) configured to compute a second-order differential value (RH2) by performing a second-order time differentiation on a humidity signal output by a humidity detection part (68); and an adhesion determination part (S105, S106, S108, S115, S116, S118, S306, S316) that is configured to determine whether a liquid is adhered to the moisture detection part based on the second-order differential value obtained by the second-order computation part. [2] Moisture measuring device according to claim 1, wherein the adhesion determination part includes an occurrence determination part (S105, S306) configured to determine whether the second-order differential value exceeds a predetermined occurrence threshold (Q1), and The adhesion detection part is configured to determine that the liquid has adhered to the moisture detection part in response to the occurrence detection part determining that the second-order differential value exceeds the occurrence threshold. [3] Moisture measuring device according to claim 2, wherein the occurrence threshold is set to a value that is large enough so that a maximum value of the second order differential of the moisture signal output by the moisture detection part is not reached when the moisture of the gas actually increases. [4] Moisture measuring device according to claim 2 or 3, wherein The adhesion determination part includes an occurrence inflection determination part (S108) configured to determine whether the second-order differential value has decreased to an occurrence inflection value (Q3) that indicates an inflection point of a temporal change in the moisture signal, after the occurrence determination part has determined that the second-order differential value has increased more than the occurrence threshold value, and The adhesion determination part is configured to determine that the liquid has adhered to the moisture detection part in response to the determination of the occurrence flexion determination part, that the second-order differential value has decreased to the occurrence flexion value. [5] Moisture measuring device according to claim 4, wherein the adhesion determination part includes an occurrence time determination part (S106) configured to determine whether the second-order differential value has decreased to the occurrence inflection value after becoming greater than the occurrence threshold in a time shorter than a predetermined occurrence threshold time (Tr1), and The adhesion determination part is configured to determine that the adherence or adhesion of the liquid to the moisture detection part occurred in response to the determination of the occurrence time determination part, that the second-order differential value decreased to the occurrence deflection value in a time shorter than the occurrence threshold time. [6] Moisture measuring device according to any one of claims 1 to 5, wherein The adhesion determination part includes a dry determination part (S115, S316) configured to determine whether the second-order differential value was less than a predetermined dry threshold (Q2), and The adhesion determination part is configured to determine that the liquid adhering to the moisture detection part has been eliminated in response to the determination of the dryness determination part, and that the second-order differential value was smaller than the dryness threshold. [7] Moisture measuring device according to claim 6, wherein the dry threshold is set to a value that is small enough not to reach a maximum value of the second order differential of the moisture signal output by the moisture detection part when the liquid adheres to the moisture detection part. [8] Moisture measuring device according to claim 6 or 7, wherein The adhesion determination part includes a dry inflection determination part (S118) configured to determine whether the second-order differential value has increased to a dry inflection value (Q3) that indicates an inflection point of a temporal change in the moisture signal, after the dry determination part has determined that the second-order differential value was lower than the dry threshold value, and The adhesion determination part is configured to determine that the liquid adhering to the moisture detection part has been eliminated in response to the determination of the dry flexion determination part, and that the second-order differential value has increased to the dry flexion value. [9] Moisture measuring device according to claim 8, wherein the adhesion determination part includes a drying time determination part (S116) configured to determine whether the second-order differential value has increased to the drying flexure value after becoming less than the drying threshold in a time shorter than a predetermined drying threshold time (Tr2), and The adhesion determination part is configured to determine that the adhesion of the liquid to the moisture detection part occurred in response to the determination of the drying time determination part, that the second-order differential value decreased to the drying flexion value in a time shorter than the drying threshold time. [10] Control device (15) for an internal combustion engine, wherein the control device is configured to control an operating state of an internal combustion engine (11) which is supplied with intake air, the control device comprising the following: a humidity maintenance unit (S301) configured to maintain intake air humidity based on a humidity signal output by a humidity detection unit (68) according to the intake air humidity; a parameter setting part (S305) that is configured to set a maintenance result of the moisture maintenance part as one of the parameters for controlling the operating state of the internal combustion engine; a second-order computation part (S303) configured to calculate a second-order differential value (RH2) by performing a second-order differentiation of the humidity signal after a time; an adhesion determination part (S306, S316) configured to determine, based on the second-order differential value obtained from the second-order computation part, whether a liquid is adhered to the moisture detection part; and a substitute adjustment part (S307) that is configured to set a predetermined substitute humidity for the humidity of the intake air as one of the parameters, instead of obtaining the maintenance result by the humidity detection part in response to the determination by the adhesion determination part that a liquid adheres to the humidity detection part. [11] Anomaly detection device (15, 44) configured to detect the adhesion of a liquid to a moisture detection part (68) configured to output a moisture signal according to the moisture content of a gas as an anomaly, the anomaly detection device comprising the following: a second-order computation part (S103, S107, S117, S303) configured to compute a second-order differential value (RH2) by performing a second-order differentiation of the humidity signal after a certain time; and an adhesion determination part (S105, S106, S108, S115, S116, S118, S306, S316) that is configured to determine whether the liquid is adhered to the moisture detection part based on the second-order differential value obtained from the second-order calculation part.