JP2005188301A - Device for discriminating kind of gasoline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for discriminating a kind of gasoline correctly and quickly discriminating a kind of gasoline even if the device is inclined or is traveling. <P>SOLUTION: The device for discriminating a kind of gasoline has a measuring part 3. The measuring part 3 includes: a gasoline flow passage 20 whose both ends are connected with one ends of first and second flow passages 4T, 4E whose other ends are respectively connected with an upstream part and a downstream part of a gasoline supply passage; and a discrimination sensor part 2 facing the gasoline flow passage. The discrimination sensor part 2 further includes: a detection part 21 of an indirectly heated type for detecting a kind of gasoline, which detection part 21 has a heating element and a thermosensitive body; and a liquid temperature detection part 22. The parts 21, 22 respectively have heat transmitting members 21c, 22c for heat-exchange with the gasoline. A cover member 2d is disposed to form a gasoline introduction passage 24 whose both ends are opened and through which the gasoline passes via the heat transmitting members. When the heating element of the detection part 21 generates heat, a kind of the gasoline is discriminated in a discrimination calculation part based on output from a detection circuit detecting a kind of gasoline, which circuit includes the thermosensitive body of the detection part 21 and the detection part 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gasoline type identification device for identifying the type of gasoline used as fuel for an internal combustion engine such as an automobile.

  In an internal combustion engine of an automobile, gasoline which is a kind of fossil fuel is used as fuel. Gasoline is a mixture of various hydrocarbons and other materials, and the material composition thereof is determined according to the material composition of the crude oil used as a raw material and the distillation conditions. Therefore, the characteristics relating to the combustion of gasoline vary depending on the material composition, and therefore, the combustion condition (gasoline injection per unit time) on the side of the internal combustion engine on the assumption of combustion of gasoline of a certain material composition (ie, a certain type). (E.g. volume) may not be optimal for other types of gasoline.

  Such specification of the type of gasoline can be performed by, for example, the temperature at which a specific ratio amount of the gasoline evaporates. For example, 50% can be selected as the specific ratio. In this case, the gasoline type is specified by T50 as a temperature at which 50% of the gasoline evaporates. T50 is, for example, about 85 ° C. at a low value and is, for example, about 125 ° C. at a high value. Gasoline having a low T50 is light, i.e., easy to evaporate, and gasoline having a high T50 is heavy, i.e., evaporative.

  By optimizing the combustion conditions and optimizing the air-fuel ratio, the output torque of the internal combustion engine is increased to improve fuel efficiency, and hydrocarbons (HC) and carbon monoxide, which are incomplete combustion products in the exhaust gas, are also achieved. The amount of (CO) or the like can be reduced. However, when the optimum combustion condition is not satisfied, the output torque is reduced and the fuel consumption is deteriorated, or the amount of incomplete combustion products is increased to cause pollution and environmental pollution.

  Therefore, by identifying the type of gasoline that is actually supplied to the internal combustion engine and appropriately setting the combustion conditions of the internal combustion engine according to the identification result, the optimum type according to the type of gasoline that is actually used for combustion is determined. It is desirable to achieve a combustion state (ie, a combustion state that increases the output torque of the internal combustion engine and reduces the amount of incomplete combustion products in the exhaust gas).

As a method for identifying the type of fluid containing liquid, for example, in Japanese Patent Application Laid-Open No. 11-153561 (Patent Document 1), a heating element is heated by energization, the temperature sensing element is heated by this heating, and the heating element senses it. A fluid identification method for determining the type of a fluid to be identified based on an electrical output corresponding to the electrical resistance of the temperature sensing body, which has a thermal effect on the heat transfer to the temperature body by the fluid to be identified. A device that periodically energizes the battery is disclosed.
JP-A-11-153561 (in particular, paragraphs [0042] to [0049])

  However, in this fluid identification method, for example, fluids having considerably different properties such as water, air, and oil can be identified by representative values. However, different types of gasoline as described above can be identified. It is not enough to apply to the system for accurate and rapid identification.

  Further, when this method is applied to gasoline type identification mounted on a moving body such as an automobile, another technical problem arises. That is, in this case, the inclination angle (inclination angle) of the vehicle with respect to the vertical direction (the direction of gravity) is not necessarily maintained constant. For example, when the vehicle is stopped on an inclined ground, the inclination angle is smaller than that when the vehicle is stopped on a flat ground. As the identification device tilts at various angles according to this, the thermal influence exerted by the gasoline as the fluid to be identified on the heat transfer from the heating element to the temperature sensing element changes, and the accuracy of the identification increases. May decrease. Furthermore, forced flow may occur in the gasoline around the heat transfer member during the movement of the vehicle due to external factors, and this causes the heat provided by the fluid to be identified for heat transfer from the heating element to the temperature sensing element. The accuracy of identification may be reduced due to a change in the influence of the image.

  In view of the present situation as described above, the present invention provides a gasoline type identification device capable of accurately and quickly identifying the type of gasoline even when tilted at various angles or while moving. With the goal.

According to the present invention, the above object is achieved as follows:
A gasoline type identification device that is arranged in a gasoline supply path and identifies the type of gasoline,
A first flow passage having one end connected to an upstream portion of the gasoline supply path; a second flow passage having one end connected to a downstream portion of the gasoline supply path; the other end of the first flow passage; A gasoline distribution path having both ends connected to the other end of the second flow path, and a measurement unit having an identification sensor unit arranged facing the gasoline distribution path,
The identification sensor unit includes an indirectly heated gasoline type detecting unit including a heating element and a temperature sensitive body, and a liquid temperature detecting unit for measuring the temperature of the gasoline, and the indirectly heated gasoline type detecting unit and Each of the liquid temperature detection parts includes a heat transfer member for a gasoline type detection part and a heat transfer member for a liquid temperature detection part for heat exchange with the gasoline, and the heat transfer member for the gasoline type detection part and a liquid temperature detection A cover member that forms a gasoline introduction path open at both ends so as to pass through the heat transfer member for the part is attached,
In the discrimination calculation unit based on the output of the gasoline type detection circuit that heats the heating element of the indirectly heated gasoline type detection unit and includes the temperature sensing body of the indirectly heated gasoline type detection unit and the liquid temperature detection unit A gasoline type identification device characterized by identifying the type of gasoline;
Is provided.

  In one aspect of the present invention, the gasoline supply path supplies gasoline from a gasoline tank to a gasoline internal combustion engine, the upstream portion is a gasoline tank side portion, and the downstream portion is a gasoline internal combustion engine side. Part.

  In one aspect of the present invention, a single pulse voltage is applied to the heating element of the indirectly heated gasoline type detection unit to cause the heating element to generate heat. In one aspect of the present invention, the identification calculation unit identifies the gasoline type based on a gasoline type corresponding voltage value corresponding to a difference between an initial temperature and a peak temperature of the temperature sensing element when the heating element generates heat. I do. In one aspect of the present invention, an average obtained by sampling and averaging the initial voltage before the start of the single pulse application to the heating element as a voltage value corresponding to the initial temperature of the temperature sensing element. Using the initial voltage value, the average peak voltage obtained by sampling and averaging the peak voltage before the end of the single pulse application to the heating element as a voltage value corresponding to the peak temperature of the temperature sensing element The difference between the average peak voltage value and the average initial voltage value is used as the gasoline type corresponding voltage value. In one aspect of the present invention, a liquid temperature corresponding output value corresponding to the liquid temperature of the gasoline is input from the liquid temperature detection unit to the identification calculation unit, and the identification calculation unit includes a plurality of known types of references. Based on the liquid temperature-corresponding output value and the gasoline type-corresponding voltage value obtained for the gasoline to be identified using a calibration curve created for gasoline and indicating the relationship of the gasoline-type-corresponding voltage value to the liquid temperature, the gasoline type Identify.

  In one aspect of the present invention, the identification calculation unit includes a microcomputer.

  In one aspect of the present invention, the housing further accommodates a portion excluding the portion on the one end side of the first flow passage, a portion excluding a portion on the one end side of the second flow passage, and the measurement portion. It has. In one aspect of the present invention, at least a portion on the one end side of the first flow passage and a portion on the one end side of the second flow passage are provided with a heat insulating coating.

  According to the present invention, since the cover member that forms the gasoline introduction path open at both ends is provided so as to pass through the heat transfer member for the gasoline type detection unit and the heat transfer member for the liquid temperature detection unit, Forced flow based on external factors is unlikely to occur in the surrounding gasoline, and there is little change in the thermal influence of the identified fluid, gasoline, on the heat transfer from the heating element to the temperature sensing element regardless of the inclination of the identification device. Therefore, the accuracy of gasoline type identification can be improved.

  Further, according to the present invention, a single pulse voltage is applied to the heating element of the indirectly heated gasoline type detection unit to cause the heating element to generate heat, and the gasoline type calculation unit calculates the gasoline based on the output of the gasoline type detection circuit. In this case, it is possible to accurately and quickly identify the type of gasoline. In particular, the gasoline type is identified by the voltage value corresponding to the gasoline type corresponding to the difference between the initial temperature and the peak temperature of the temperature sensing element when the heating element generates heat. For example, the average peak voltage value and the average By using the difference from the initial voltage value, stable and accurate and quick identification is possible.

  In addition, according to the present invention, by applying a heat insulation coating to at least the portion connected to the gasoline supply path upstream portion of the first flow passage and the portion connected to the gasoline supply route downstream portion of the second flow passage, The influence of the external temperature on the measurement unit can be reduced, and the identification accuracy can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a use state of an embodiment of a gasoline type identification device according to the present invention, and FIGS. 2 to 4 are partial sectional views thereof. In the present embodiment, the gasoline supply path supplies gasoline from the gasoline tank to the gasoline internal combustion engine. However, the gasoline supply path of the present invention is not limited to this, for example, gasoline from the gasoline tank to the tank truck. Or a route for supplying gasoline from a large gasoline tank to a small tank.

  As shown in FIG. 1, a gasoline type identification device 1 that identifies the type of gasoline is disposed in the course of supplying gasoline from a gasoline tank T to a gasoline internal combustion engine E. The identification device 1 is a measuring unit 3, a first flow passage 4T having one end connected to a tank side portion (pipe) 14T, which is an upstream portion of the gasoline supply path, by a pipe joint 8T, and a downstream portion of the gasoline supply path. A second internal flow passage 4E having one end connected to a gasoline internal combustion engine side portion (piping) 14E by a pipe joint 8E is provided. The measuring unit 3 has a gasoline distribution path 20 formed by the case substrate 2a and the case cover 2b, and one end (the lower end in FIGS. 1 to 3) of the distribution path is the other end of the first flow path 4T. And the other end (the upper end in FIGS. 1 to 3) is connected to the other end of the second flow passage 4E.

  The identification device according to the present embodiment excludes the measurement unit 3 and a part of the first flow passage 4T (that is, an end connected to the tank side portion 14T of the gasoline supply path as shown in FIG. 1). Portion) and a part of the second flow passage 4E (that is, a portion excluding an end portion connected to the engine side portion 14E of the gasoline supply path as shown in FIG. 1). . Further, the portion of the first flow passage 4T outside the housing 6 (that is, the end connected to the tank side portion 14T of the gasoline supply path) is covered with a heat insulating coating material 4T1, and the housing 6 of the second flow passage 4E. The outer portion (that is, the end connected to the engine side portion 14E of the gasoline supply path) is covered with a heat insulating coating material 4E1.

  In the housing 6, a circuit board 12 constituting a gasoline type detection circuit described later is disposed. The circuit board 12 is equipped with a microcomputer that constitutes an identification calculation section described later. Moreover, wiring 13 for communication between the circuit board 12 and the outside is provided.

  A heat insulating material is filled in the internal space of the housing 6 (a portion excluding the measurement unit 3, the first flow passage 4T, the second flow passage 4E, the circuit board 12, and the like). As this heat insulating material and the heat insulating covering materials 4T1 and 4E1, for example, those made of rubber or foamed plastic can be used. Thus, even if the first flow passage 4T and the second flow passage 4E are made of metal, the influence of the external temperature on the measurement unit 3 is present due to the presence of the heat insulating covering materials 4T1 and 4T1, the housing 6 and the heat insulating material therein. Can be reduced, and the identification accuracy can be improved. When the housing 6 is not provided, it is preferable to apply a heat insulation coating to the entire first flow passage 4T and the second flow passage 4E.

  Further, the measurement unit 3 includes an identification sensor unit 2 disposed facing the gasoline distribution path 20. The identification sensor unit 2 includes an indirectly heated gasoline type detection unit 21 including a heating element and a temperature sensing body, and a liquid temperature detection unit 22 that measures the gasoline temperature. The indirectly heated gasoline type detection unit 21 and the liquid temperature detection unit 22 are arranged at a certain distance in the vertical direction. FIG. 5 shows a cross-sectional view of the indirectly heated gasoline type detection unit 21.

  As shown in the figure, the indirectly heated gasoline type detection unit 21 and the liquid temperature detection unit 22 are integrated by a mold resin 23. As shown in FIG. 5, the indirectly heated gasoline type detection unit 21 is for a gasoline type detection unit bonded with a thin film chip 21 a including a heating element and a temperature sensing element, and the thin film chip and a bonding material 21 b. It has metal fins 21c as heat transfer members, and external electrode terminals 21e that are electrically connected to the electrodes of the heating element and the temperature sensing element of the thin film chip by bonding wires 21d. The liquid temperature detection unit 22 has a similar configuration, and includes metal fins 22c and external electrode terminals 22e as heat transfer members for the liquid temperature detection unit.

FIG. 6 shows an exploded perspective view of the thin film chip 21 a of the indirectly heated gasoline type detection unit 21. Thin film chip 21a is, for example, a substrate 21a1 made of _Al 2 _{O 3,} and temperature sensing element 21a2 made of Ti / Pt, an interlayer insulating film 21a3 made of SiO _2, the heating element comprising a heating element 21a4 and Ni made of TaSiO ₂ an electrode 21a5, a protective film 21a6 made of SiO _2, and an electrode pad 21a7 made of Ti / Au, consists that sequentially appropriately stacked. Although not shown, the temperature sensing element 21a2 is formed in a meandering pattern. The thin film chip 22a of the liquid temperature detection unit 22 has the same structure, but only the temperature sensing element 22a2 is actuated without causing the heating element to act.

  As shown in FIGS. 3 and 4, the mold resin 23 of the indirectly heated gasoline type detection unit 21 and the liquid temperature detection unit 22 is attached to the case substrate 2 a of the measurement unit 3. A cover member 2d is attached to the case substrate 2a so as to pass through the gasoline type detection unit fins 21c and the liquid temperature detection unit fins 22c. By this cover member, a gasoline introduction path 24 having both upper and lower ends opened in the vertical direction in FIGS. 1 to 3 is formed through the gasoline type detection part fin 21c and the liquid temperature detection part fin 22c in order. As shown in FIG. 4, by attaching the cover member 2d to the case substrate 2a, the flange portion of the mold resin 23 is pressed toward the case substrate 2a, whereby the mold resin 23 is applied to the case substrate 2a. It is fixed against.

  The case substrate 2a, the case cover 2b, the cover member 2d, the first flow passage 4T, and the second flow passage 4E are all made of a corrosion-resistant material such as stainless steel.

  FIG. 7 shows a configuration of a circuit for identifying the gasoline type in the present embodiment. A bridge circuit 68 is formed by the temperature sensing element 21a2 of the indirectly heated gasoline type detection unit 21, the temperature sensing element 22a2 of the liquid temperature detection unit 22, and the two resistors 64 and 66. The output of the bridge circuit 68 is input to a differential amplifier 70, and the output of the differential amplifier (also referred to as gasoline type detection circuit output or sensor output) constitutes an identification calculation unit via an A / D converter (not shown). Is input to a microcomputer 72. Further, a liquid temperature corresponding output value corresponding to the gasoline liquid temperature is input to the microcomputer 72 from the temperature sensing element 22a2 of the liquid temperature detecting unit 22 via the liquid temperature detecting amplifier 71. On the other hand, the microcomputer 72 outputs a heater control signal for controlling opening and closing of the switch 74 located in the energization path to the heating element 21a4 of the indirectly heated gasoline type detection unit 21.

  Hereinafter, the gasoline type identifying operation in the present embodiment will be described.

  When the gasoline type is identified, the supply of gasoline from the tank T to the engine E is stopped. That is, the gasoline type identification is performed when the engine operation is stopped. The gasoline supply path from the tank T to the engine E is always filled with gasoline, including the interior of the gasoline distribution path 20, the first flow path 4T and the second flow path 4E of the identification device 1. Therefore, when the gasoline type is identified, the gasoline in the gasoline distribution path 20 including the gasoline introduction path 24 is not practically forced to flow.

  By closing the switch 74 for a predetermined time (for example, 4 seconds) by a heater control signal output from the microcomputer 72 to the switch 74, a single pulse voltage P having a predetermined height (for example, 10V) with respect to the heating element 21a4. To generate heat. At this time, the output voltage (sensor output) Q of the differential amplifier 70 gradually increases during voltage application to the heating element 21a4 and gradually decreases after voltage application to the heating element 21a4 is completed, as shown in FIG. To do.

  In the microcomputer 72, as shown in FIG. 8, the sensor output is sampled a predetermined number of times (for example, 256 times) for a predetermined time (for example, 0.1 second) before the voltage application to the heating element 21a4 is started, and the average value is obtained. To obtain the average initial voltage value V1. This average initial voltage value V1 corresponds to the initial temperature of the temperature sensing element 21a2. Further, as shown in FIG. 8, the sensor output is sampled a predetermined number of times (for example, 256 times) for a predetermined time (for example, 0.1 second) before the voltage application to the heating element 21a4 is stopped, and the average value is obtained. Calculation is performed to obtain an average peak voltage value V2. This average peak voltage value V2 corresponds to the peak temperature of the temperature sensing element 21a2. Then, a difference V0 (= V2−V1) between the average initial voltage value V1 and the average peak voltage value V2 is obtained as the gasoline type corresponding voltage value.

  On the other hand, with such a method, a calibration curve showing the relationship between temperature and gasoline type corresponding voltage value V0 is obtained in advance for several gasolines (reference gasolines) with known material composition (that is, T50 is known). The calibration curve is stored in the storage means of the microcomputer 72. An example of a calibration curve is shown in FIG. In this example, calibration curves are created for reference gasolines with T50s of 87 ° C and 125 ° C.

  As shown in FIG. 9, the gasoline type-corresponding voltage value V0 depends on the temperature. Therefore, using this calibration curve, the type of gasoline to be measured (in this embodiment, the type of gasoline is specified by T50). Is measured, the liquid temperature corresponding output value T input from the temperature sensing element 22a2 of the liquid temperature detecting unit 22 via the liquid temperature detecting amplifier 71 is also used. An example of the liquid temperature corresponding output value T is shown in FIG. Such a calibration curve is also stored in the storage means of the microcomputer 72.

In the measurement, first, the temperature value is obtained from the liquid temperature corresponding output value T obtained for the gasoline to be measured using the calibration curve of FIG. Assuming that the obtained temperature value is t, then, in the calibration curve of FIG. 9, the gasoline type corresponding voltage values V0 (T50 = 87 ° C .; t), V0 (T50 = 125 ° C.) of each calibration curve corresponding to the temperature value t. To obtain t). Then, the gasoline type-corresponding voltage value V0 (T50 = 87 ° C.) of each calibration curve indicates how many degrees C. of the gasoline type-corresponding voltage value V0 (T50 = X ° C .; t) obtained for the gasoline to be measured corresponds. T), V0 (T50 = 125 ° C .; t) is determined by performing a proportional operation. That is, X ° C. is based on V0 (T50 = X ° C .; t), V0 (T50 = 87 ° C .; t) and V0 (T50 = 125 ° C .; t).
38 ° C. [V0 (T50 = X ° C .; t) −V0 (T50 = 87 ° C .; t)]
/ [V0 (T50 = 125 ° C .; t) −V0 (T50 = 87 ° C .; t)]
Ask from. As described above, the gasoline type can be identified accurately and quickly (instantly). Note that, by adopting the calibration curve in FIG. 9 using the liquid temperature corresponding output value T instead of the temperature, storage of the calibration curve in FIG. 10 and conversion using this can be omitted.

A signal indicating the gasoline type value (T50) obtained in this way is output to an output buffer circuit 76 shown in FIG. 7 via a D / A converter (not shown), from which it is output as an analog output. It is output to a main computer (ECU) that performs combustion control of the engine of the illustrated automobile. The analog output can be in a form suitable for the ECU side that is the receiver. For example, the output value corresponding to T50 = 87 ° C. is 0.5 V and the output value corresponding to T50 = 125 ° C. The voltage output at a scale of 3.5V can be obtained. That is, the output voltage SV at T50 = X ° C. is expressed by the following equation: SV = 0.5V +
3V [V0 (T50 = X ° C; t) −V0 (T50 = 87 ° C; t)]
/ [V0 (T50 = 125 ° C .; t) −V0 (T50 = 87 ° C .; t)]
It is represented by An analog output voltage value corresponding to the liquid temperature is also output to the main computer (ECU). On the other hand, the signal indicating the gasoline type value and the liquid temperature value can be taken out as a digital output as necessary and input to a device that performs display, alarm, or other operations.

  The above gasoline type identification utilizes the principle that the kinematic viscosity of gasoline and the sensor output have a correlation using natural convection. In order to improve the accuracy of such gasoline type identification, it is preferable that forced flow based on external factors be made as difficult as possible in the gasoline around the gasoline type detection unit fin 21c and the liquid temperature detection unit fin 22c. From this point of view, it is preferable to use the cover member 2d, particularly one that forms a gasoline introduction path in the vertical direction. Note that the cover member 2d also functions as a protective member that prevents contact of foreign matter.

  The cover member 2d also exhibits a function of improving the accuracy of gasoline type identification when the tilt angle of the measuring unit 3, particularly the identification sensor unit 2, with respect to the vertical direction is changed, as compared with the case where no cover member is present. That is, when there is no cover member, the change in the form in which the heat generated from the heating element is transmitted to the temperature sensing element by the natural convection is large with respect to the change in the inclination angle. The change in the corresponding voltage value V0 is large, and therefore the inclination range where the confusion with the output value in the case of other types of gasoline does not occur is relatively narrow. On the other hand, when the cover member 2d is present, the change in the form in which the heat generated from the heating element is transmitted to the temperature sensing element by the natural convection is small with respect to the change in the inclination angle (that is, the natural change). Convection is always made mainly along the gasoline introduction path in the cover member 2d). Therefore, the change in the voltage value V0 corresponding to the gasoline type of the same gasoline is small, so that it is confused with the output value in the case of other types of gasoline. The tilt range that does not occur is relatively wide.

  FIG. 11 shows the change in the gasoline type-corresponding voltage value V0 obtained when the inclination angle of the measurement part is changed in the embodiment of the present invention (with the cover member 2d), and FIG. 12 shows that the cover member is not removed. Indicates the change in the voltage value V0 corresponding to the gasoline type obtained when the inclination angle of the measurement unit is changed in the same (comparative form) as in the embodiment of the present invention. Two types of gasoline having different T50s (sample 1 [T50 = 99 ° C.] and sample 2 [T50 = 87 ° C.]) are used, and the direction of inclination is the X direction shown in FIG. 13 (a) and FIG. Two types in the Y direction shown in FIG. In the comparative embodiment, as shown in FIG. 12, the gasoline type-corresponding voltage value V0 may overlap between the sample 1 and the sample 2 within the range of the inclination angle θ of ± 30 °. As shown in FIG. 11, the gasoline type corresponding voltage value V0 does not overlap between the sample 1 and the sample 2 in the range where the inclination angle θ is ± 30 °. Thus, it can be seen that by attaching the cover member 2d, it is possible to identify the gasoline type with high accuracy in a wide inclination range.

It is a typical block diagram which shows the use condition of one Embodiment of the gasoline kind identification device by this invention. It is a fragmentary sectional view of the gasoline kind identification device of FIG. It is a fragmentary sectional view of the gasoline kind identification device of FIG. It is a fragmentary sectional view of the gasoline kind identification device of FIG. It is sectional drawing of a side heat type gasoline kind detection part. It is a disassembled perspective view of the thin film chip | tip of an indirectly heated gasoline kind detection part. It is a block diagram of the circuit for gasoline type identification. It is a figure which shows the relationship between the single pulse voltage P applied to a heat generating body, and the sensor output Q. FIG. It is a figure which shows the example of a calibration curve. It is a figure which shows an example of the liquid temperature corresponding | compatible output value T. FIG. The change of the gasoline type corresponding | compatible voltage value V0 obtained when the inclination angle was changed in this invention embodiment is shown. The change of the gasoline type corresponding | compatible voltage value V0 obtained when changing the inclination angle by the comparison form is shown. It is a figure which shows the direction of the inclination of a measurement part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Identification apparatus 2 Identification sensor part 2a Case board 2b Case cover 2d Cover member 21 Side heat type gasoline kind detection part 22 Liquid temperature detection part 23 Mold resin 24 Gasoline introduction path 21a Thin film chip 21b Bonding material 21c, 22c Metal fin 21d Bonding Wire 21e, 22e External electrode terminal 21a1 Substrate 21a2, 22a2 Temperature sensing element 21a3 Interlayer insulating film 21a4 Heating element 21a5 Heating element electrode 21a6 Protective film 21a7 Electrode pad 3 Measuring part 4T First flow path 4E Second flow path 4T1, 4E1 Thermal insulation coating Material 6 Housing 8T, 8E Fitting 12 Circuit board 13 Wiring 14T Tank side part of gasoline supply path 14E Gasoline internal combustion engine side part of gasoline supply path 20 Gasoline distribution path 64, 66 Resistor 68 Bridge circuit 70 Dynamic amplifier 71 liquid temperature detecting amplifier 72 microcomputer
74 switch 76 output buffer circuit T gasoline tank E gasoline internal combustion engine

Claims (9)

A gasoline type identification device that is arranged in a gasoline supply path and identifies the type of gasoline,
A first flow passage having one end connected to an upstream portion of the gasoline supply path; a second flow passage having one end connected to a downstream portion of the gasoline supply path; the other end of the first flow passage; A gasoline distribution path having both ends connected to the other end of the second flow path, and a measurement unit having an identification sensor unit arranged facing the gasoline distribution path,
The identification sensor unit includes an indirectly heated gasoline type detecting unit including a heating element and a temperature sensitive body, and a liquid temperature detecting unit for measuring the temperature of the gasoline, and the indirectly heated gasoline type detecting unit and Each of the liquid temperature detection parts includes a heat transfer member for a gasoline type detection part and a heat transfer member for a liquid temperature detection part for heat exchange with the gasoline, and the heat transfer member for the gasoline type detection part and a liquid temperature detection A cover member that forms a gasoline introduction path open at both ends so as to pass through the heat transfer member for the part is attached,
In the discrimination calculation unit based on the output of the gasoline type detection circuit that heats the heating element of the indirectly heated gasoline type detection unit and includes the temperature sensing body of the indirectly heated gasoline type detection unit and the liquid temperature detection unit A gasoline type identification device for identifying the type of gasoline. The gasoline supply path is for supplying gasoline from a gasoline tank to a gasoline internal combustion engine, wherein the upstream side portion is a gasoline tank side portion and the downstream side portion is a gasoline internal combustion engine side portion. The gasoline type identification device according to claim 1. 3. The gasoline type identification device according to claim 1, wherein a single pulse voltage is applied to the heating element of the indirectly heated gasoline type detection unit to cause the heating element to generate heat. 4. The identification calculation unit is characterized in that the gasoline type is identified by a gasoline type corresponding voltage value corresponding to a difference between an initial temperature and a peak temperature of the temperature sensing element when the heating element generates heat. The gasoline type identification device according to claim 3. Using the average initial voltage value obtained by sampling and averaging the initial voltage before the start of the single pulse application to the heating element as a voltage value corresponding to the initial temperature of the temperature sensing element, the sensitivity Using the average peak voltage value obtained by sampling and averaging the peak voltage before the end of the application of the single pulse to the heating element as a voltage value corresponding to the peak temperature of the warm body, corresponding to the gasoline type The gasoline type identification device according to claim 4, wherein a difference between the average peak voltage value and the average initial voltage value is used as a voltage value. A liquid temperature corresponding output value corresponding to the liquid temperature of the gasoline is input from the liquid temperature detection unit to the identification calculation unit, and the identification calculation unit generates gasoline for a plurality of known types of reference gasoline. The gasoline type is identified based on the liquid temperature-corresponding output value obtained for the gasoline to be identified and the gasoline type-corresponding voltage value using a calibration curve indicating the relationship between the type-corresponding voltage values. The gasoline type identification device according to any one of claims 4 to 5. The gasoline type identification device according to any one of claims 1 to 6, wherein the identification calculation unit includes a microcomputer. And a housing for housing the portion excluding the portion on the one end side of the first flow passage, the portion excluding the portion on the one end side of the second flow passage, and the measuring portion. The gasoline type identification device according to any one of claims 1 to 7. The heat insulating coating is applied to at least a portion on the one end side of the first flow passage and a portion on the one end side of the second flow passage. The gasoline type identification device described.

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