WO2011101980A1 - 燃料性状検出装置の異常検出装置 - Google Patents
燃料性状検出装置の異常検出装置 Download PDFInfo
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- WO2011101980A1 WO2011101980A1 PCT/JP2010/052528 JP2010052528W WO2011101980A1 WO 2011101980 A1 WO2011101980 A1 WO 2011101980A1 JP 2010052528 W JP2010052528 W JP 2010052528W WO 2011101980 A1 WO2011101980 A1 WO 2011101980A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0076—Details of the fuel feeding system related to the fuel tank
- F02M37/0082—Devices inside the fuel tank other than fuel pumps or filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an abnormality detection device for a fuel property detection device.
- OBD system In order to comply with the laws and regulations that require an in-vehicle failure diagnosis system (OBD system), determine whether the fuel property detection device is operating normally, and quickly detect it when an abnormality occurs May be required.
- OBD system In order to comply with the laws and regulations that require an in-vehicle failure diagnosis system (OBD system), determine whether the fuel property detection device is operating normally, and quickly detect it when an abnormality occurs May be required.
- a warning signal is output when a change in concentration detected by a sensor for detecting the alcohol concentration of an alcohol-mixed fuel is equal to or greater than a predetermined value, and a warning signal is output.
- a technique for monitoring a change in the air-fuel ratio for a predetermined time and determining that the alcohol concentration sensor is abnormal when a deviation in the air-fuel ratio is detected is a technique for monitoring a change in the air-fuel ratio for a predetermined time and determining that the alcohol concentration sensor is abnormal when a deviation in the air-fuel ratio is detected.
- the detected value of the fuel property sensor does not change, so that the sensor failure cannot be detected. Even if the sensor itself is not broken down, the detected value of the sensor may change if the flow of fuel is disturbed due to clogging of foreign matter in the vicinity of the sensor. In such a case, there is a possibility that it is erroneously determined that the fuel property sensor is out of order.
- the present invention has been made in view of the above points, and an object of the present invention is to provide an abnormality detection device that can accurately detect the presence or absence of abnormality of the fuel property detection device.
- a first invention is an abnormality detection device for a fuel property detection device,
- a fuel property detecting device having a sensor portion disposed in a fuel passage for supplying fuel to the internal combustion engine, and detecting a property of the fuel passing through the fuel passage;
- Temperature detecting means for detecting the fuel temperature in the vicinity of the sensor unit;
- a heater capable of increasing the fuel temperature in the vicinity of the sensor unit;
- An abnormality determining means for determining the presence or absence of an abnormality in the fuel property detecting device based on the temperature detected by the temperature detecting means when the heater is operated; It is characterized by providing.
- the second invention is the first invention, wherein
- the abnormality determining means includes a fuel flow abnormality determining means for determining whether there is an abnormality in the fuel flow in the vicinity of the sensor unit, and a failure determining means for determining whether there is a failure in the fuel property detecting device itself.
- the determination by the failure determination means is executed when it is determined by the abnormality determination means that there is no abnormality in the fuel flow in the vicinity of the sensor section.
- the third invention is the first or second invention, wherein
- the abnormality determining means includes fuel flow abnormality determining means for determining whether or not there is an abnormality in the fuel flow in the vicinity of the sensor unit,
- the fuel flow abnormality determining means includes Flow rate acquisition means for acquiring a fuel flow rate through the fuel passage; Energy input acquisition means for acquiring energy input by the heater; Temperature estimation means for calculating a temperature estimated by the temperature detection means based on the energy input amount and the fuel flow rate; Means for comparing the estimated temperature calculated by the temperature estimating means with the temperature actually detected by the temperature detecting means to determine whether there is an abnormality in the fuel flow in the vicinity of the sensor unit; It is characterized by including.
- 4th invention is 2nd or 3rd invention
- the fuel flow abnormality determining means Prior to execution of the determination by the fuel flow abnormality determining means, includes flow rate increasing means for performing control to increase the fuel flow rate through the fuel passage.
- the fifth invention is the second or third invention, wherein When the fuel flow rate through the fuel passage is lower than a predetermined value, there is provided avoidance means for avoiding execution of determination by the fuel flow abnormality determination means.
- the abnormality determination means includes failure determination means for determining whether or not the fuel property detection device itself has a failure
- the sensor unit detects a value having temperature dependent characteristics
- the fuel property detection device includes a temperature correction unit that calculates a fuel property value by performing a correction process based on the fuel temperature detected by the temperature detection unit with respect to the value detected by the sensor unit
- the failure determination means acquires the fuel property values subjected to the correction processing at a plurality of points at which the fuel temperature is different when the heater is operated, and based on an error between the fuel property values at each point, It is characterized by determining the presence or absence of a failure of the fuel property detection device.
- the seventh invention is the sixth invention, wherein
- the sensor unit is disposed in or near a fuel distribution passage for distributing fuel to a fuel injector of each cylinder of the internal combustion engine,
- the heater is capable of heating the fuel in the fuel distribution passage.
- the eighth invention is the seventh invention, wherein The failure determination means performs the determination by utilizing an opportunity that the heater is operated when the internal combustion engine is cold-started.
- the ninth invention is the seventh or eighth invention, wherein The apparatus further comprises means for controlling energization to the heater based on the fuel temperature detected by the temperature detecting means when the internal combustion engine is cold started.
- the fuel temperature in the vicinity of the sensor unit of the fuel property detection device is raised by the heater, and the temperature in the vicinity of the sensor unit at that time is detected, so that the presence or absence of abnormality in the fuel property detection device can be detected quickly and It can be detected accurately.
- the second aspect of the present invention it is possible to accurately distinguish and detect whether there is an abnormality in the fuel flow in the vicinity of the sensor unit or whether there is a failure in the fuel property detection device itself.
- the temperature estimated based on the amount of energy input by the heater and the fuel flow rate in the fuel passage is compared with the actually detected temperature, so that the abnormality in the fuel flow in the vicinity of the sensor unit The presence or absence of can be determined. Thereby, the presence or absence of abnormality of the fuel flow in the vicinity of the sensor unit can be accurately detected by a simple method.
- the abnormality detection control of the fuel flow in the vicinity of the sensor unit can be executed, so the detection accuracy can be improved.
- the abnormality detection control of the fuel flow in the vicinity of the sensor unit can be executed, so that the detection accuracy can be improved.
- the seventh aspect of the invention it is possible to detect the abnormality of the fuel property detection device using the heater for heating the fuel in the fuel distribution passage, so there is no need to provide a dedicated heater in the fuel property detection device. . For this reason, a structure can be simplified and cost can be reduced.
- the failure determination means performs failure detection of the fuel property detection device by utilizing an opportunity that the heater for heating the fuel in the fuel distribution passage is activated during a cold start of the internal combustion engine. Can do. For this reason, since it is not necessary to operate a heater only for the failure detection of a fuel property detection apparatus, energy loss can be suppressed.
- energization of the heater for heating the fuel in the fuel distribution passage can be controlled based on the detected fuel temperature. For this reason, since the temperature of the fuel supplied to the internal combustion engine at the cold start can be raised within a necessary and sufficient range, energy loss can be suppressed while reliably preventing fuel vaporization failure.
- FIG. 1 is a diagram schematically showing an apparatus configuration according to the first embodiment of the present invention.
- the apparatus of this embodiment is mounted on an automobile in which a fuel containing a component derived from biomass (in this embodiment, ethanol) is used, and has a function of detecting the concentration of the contained component. is there.
- a fuel containing a component derived from biomass in this embodiment, ethanol
- the apparatus of this embodiment includes electrodes 10 and 12, a temperature sensor 14, a heater 18, and an ECU (Electronic Control Unit) 50.
- the electrodes 10 and 12 and the temperature sensor 14 are electrically connected to the ECU 50, respectively.
- the ECU 50 can control energization to the heater 18.
- the ECU 50 includes various actuators such as a fuel injector, spark plug, and throttle valve provided for an internal combustion engine (hereinafter referred to as “engine”) 70, and various sensors such as a crank angle sensor and an air-fuel ratio sensor. Are electrically connected.
- the electrodes 10 and 12 are installed inside a fuel passage 60 for sending fuel from a fuel tank (not shown) to the fuel injector of the engine 70.
- the electrodes 10 and 12 are both cylindrical, and are arranged concentrically with the small-diameter electrode 12 inserted inside the large-diameter electrode 10.
- the center lines of the electrodes 10 and 12 are arranged so as to be parallel to the fuel flow direction of the fuel passage 60. As a result, the fuel easily flows through the gap between the electrode 10 and the electrode 12, so that the fuel can be reliably prevented from staying in the gap between the electrode 10 and the electrode 12.
- a temperature sensor 14 composed of, for example, a thermistor is installed.
- the temperature sensor 14 can detect the temperature of the fuel interposed between the electrodes 10 and 12.
- a heater 18 is further installed in the vicinity of the electrodes 10 and 12. By energizing the heater 18 and heating it, the temperature of the fuel interposed between the electrodes 10 and 12 can be raised.
- FIG. 2 is a diagram schematically showing another configuration example of the apparatus according to the first embodiment of the present invention.
- the large-diameter electrode 10 and the small-diameter electrode 12 that are both cylindrical and concentrically positioned are arranged such that their center lines are perpendicular to the fuel flow direction of the fuel passage 60.
- the electrodes 10 and 12 are shown in cross-section. Holes 20 are formed in the side surface of the outer electrode 10 at two locations intersecting the fuel flow direction.
- the fuel flowing through the fuel passage 60 can enter the gap between the electrode 10 and the electrode 12 through the hole 20 on the upstream side, and exit from the hole 20 on the downstream side.
- the fuel can easily flow through the gap between the electrode 10 and the electrode 12, and the fuel can be reliably prevented from staying in the gap between the electrode 10 and the electrode 12.
- a temperature sensor 14 and a heater 18 are installed inside the electrode 12.
- the end of the electrode 12 is closed, and no fuel enters the inside of the electrode 12. For this reason, the temperature sensor 14 and the heater 18 are not in direct contact with the fuel.
- the temperature detected by the temperature sensor 14 can be regarded as the fuel temperature between the electrodes 10 and 12. .
- the heater 18 can raise the temperature of the fuel interposed between the electrodes 10 and 12.
- FIG. 2 is the same as the apparatus shown in FIG. 1 except for the points described above.
- This embodiment can be realized by using either the apparatus configuration shown in FIG. 1 or the apparatus configuration shown in FIG. The matters described below are common to FIGS. 1 and 2.
- the ECU 50 has a function of detecting (measuring) the capacitance between the electrodes 10 and 12.
- the capacitance between the electrodes 10 and 12 (hereinafter simply referred to as “capacitance”) varies according to the relative dielectric constant of the fuel interposed between the electrodes 10 and 12.
- the relative permittivity of the ethanol-containing fuel changes according to the concentration of ethanol contained. For this reason, the capacitance changes according to the ethanol concentration of the fuel interposed between the electrodes 10 and 12.
- FIG. 3 is a graph showing the relationship between ethanol concentration, temperature and capacitance of an ethanol-containing fuel.
- the ECU 50 stores in advance a map as shown in FIG. 3 (hereinafter referred to as “ethanol concentration calculation map”).
- the ECU 50 can calculate the ethanol concentration based on the detected capacitance, the fuel temperature detected by the temperature sensor 14, and the ethanol concentration calculation map shown in FIG.
- inter-electrode fuel flow the flow of fuel between the electrodes 10 and 12 (hereinafter referred to as “inter-electrode fuel flow”) is obstructed for some reason, such as when foreign matter is caught in the gap between the electrodes 10 and 12, the electrode 10 , 12, the same fuel continues to stay, so that the accurate ethanol concentration of the fuel flowing through the fuel passage 60 cannot be detected. For this reason, in the unlikely event that such a situation occurs, it is desirable that this can be detected quickly.
- the abnormality of the fuel flow between the electrodes is detected as follows.
- the fuel temperature between the electrodes 10 and 12 detected by the temperature sensor 14 (hereinafter referred to as “electrode temperature”) is a heating amount (energy) by the heater 18. Input amount) and the amount of heat removed by the flow of fuel. Therefore, the electrode portion temperature can be estimated based on the amount of heating by the heater 18 and the fuel flow rate in the fuel passage 60.
- the electrode temperature detected by the temperature sensor 14 is higher than the estimated electrode temperature. Therefore, it is possible to determine whether the fuel flow between the electrodes is normal or abnormal by comparing the estimated electrode temperature and the electrode temperature detected by the temperature sensor 14.
- FIG. 4 is a flowchart of a routine executed by the ECU 50 in the present embodiment when determining whether there is an abnormality in the flow between the electrodes.
- the detection value of the temperature sensor 14 is acquired prior to the start of energization of the heater 18 (step 100).
- the detected value is hereinafter referred to as “electrode initial temperature” and is represented by the symbol T 0 .
- energization of the heater 18 is started (step 102).
- Electrode portion estimated temperature This estimated value is hereinafter referred to as “electrode portion estimated temperature” and is represented by the symbol Ts.
- the electrode portion initial temperature T 0 obtained in the above step 102, the energization amount to the heater 18 (hereinafter referred to as “heater power”), and the fuel flow rate in the fuel passage 60 are used.
- the estimated part temperature Ts is calculated.
- FIG. 5 is a map for calculating the electrode portion estimated temperature Ts.
- the heater power can be regarded as being equal to the heating amount (energy input amount) by the heater 18.
- the electrode part temperature is higher than the electrode part initial temperature T 0 as the heating amount (heater power) is increased.
- the ECU 50 can calculate the fuel flow rate based on the fuel injection amount from the fuel injector.
- the estimated electrode portion temperature Ts calculated in step 104 is compared with the actual measured value T of the electrode portion temperature by the temperature sensor 14 at this time (step 106). Specifically, the success or failure of the following equation is determined. Ts + ⁇ ⁇ T (1)
- ⁇ is a value set in advance as the maximum error that can be considered within the normal range.
- step 110 determines whether the fuel flow between the electrodes is normal.
- the above-described abnormality detection control of the inter-electrode fuel flow can be performed at any time as long as fuel is flowing in the fuel passage 60.
- the abnormality detection accuracy is higher when the fuel flow rate in the fuel passage 60 is somewhat large. This is because when the fuel flow rate in the fuel passage 60 is small (when the engine load is small and the fuel consumption is small), the fuel flow between the electrodes is originally slow, so it is difficult to determine whether there is an abnormality in the fuel flow between the electrodes. Because.
- FIG. 6 is a flowchart of a routine executed by the ECU 50 when such control is performed.
- step 120 it is determined whether or not a condition for executing the abnormality detection control of the fuel flow between the electrodes is satisfied.
- the abnormality detection control of the fuel flow between electrodes is determined in advance, for example, to be executed every predetermined time or once during one trip from engine start to stop. In this step 120, it is determined whether or not the timing to be executed has arrived.
- control for increasing the fuel flow rate in the fuel passage 60 is executed (step 122). This control can be executed as follows, for example.
- the engine 70 is operated at a high load to increase the amount of power generation, and surplus power is charged to the battery. Thereby, the fuel consumption in the engine 70 increases, and the fuel flow rate in the fuel passage 60 can be increased.
- step 124 the abnormality detection control of the inter-electrode fuel flow is executed. That is, in this step 124, the processing of the routine of FIG. 4 described above is executed.
- the abnormality detection control of the inter-electrode fuel flow can be executed in a state where the fuel flow rate is high, so that the detection accuracy can be improved.
- FIG. 7 is a flowchart of a routine that the ECU 50 executes when such control is performed.
- the same steps as those of the routine shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted or simplified.
- the current fuel flow rate in the fuel passage 60 is determined as follows. It is acquired and it is determined whether the value is equal to or greater than a predetermined value (step 126).
- This predetermined value is a determination value as to whether or not an abnormality in the fuel flow between the electrodes can be detected with sufficiently high accuracy. Therefore, in step 126, when the current fuel flow rate is less than the predetermined value, it can be predicted that sufficient detection accuracy cannot be obtained, so execution of abnormality detection control of the inter-electrode fuel flow is avoided.
- step 126 if the current fuel flow rate is equal to or greater than the predetermined value, it can be predicted that sufficient detection accuracy can be obtained. 124). Also by such control, the abnormality detection control of the inter-electrode fuel flow can be executed in a state where the fuel flow rate is high, so that the detection accuracy can be improved.
- the present invention is not limited to this, for example, fuel refraction.
- the present invention can also be applied to an apparatus for detecting fuel properties by measuring other physical quantities such as rate and absorbance.
- the electrodes 10 and 12 are the “sensor portion” in the first invention
- the ethanol concentration is the “fuel property” in the first invention
- the temperature sensor 14 is the first sensor.
- the capacitance (relative permittivity) corresponds to the “value having temperature dependent characteristics” in the sixth invention, respectively, in the “temperature detecting means” in the first invention.
- the ECU 50 executes the routine of FIG. 4
- the “fuel flow abnormality determining means” in the second and third inventions executes the routine of FIG.
- the "flow rate increasing means” in the invention of No. 4 executes the processing of the above steps 120 and 126, so that the "avoidance means” in the fifth invention is the detected capacitance and fuel temperature and the map shown in FIG.
- the “temperature correction means” according to the sixth aspect of the present invention is realized by calculating the ethanol concentration (fuel property value) based on the above.
- Embodiment 2 the second embodiment of the present invention will be described with reference to FIG. 8 to FIG. 10. The description will focus on the differences from the first embodiment described above, and the same matters will be described. Simplify or omit.
- FIG. 8 is a diagram schematically showing an apparatus configuration according to the second embodiment of the present invention.
- the fuel injector 22 provided in each cylinder of the in-line four-cylinder engine 70 is connected to a delivery pipe (fuel distribution passage) 24.
- the fuel sent from the fuel tank is distributed to the fuel injector 22 of each cylinder through the delivery pipe 24.
- the delivery pipe 24 is provided with a heater 26 that can heat the fuel in the delivery pipe 24. Energization of the heater 26 is controlled by the ECU 50. In the engine 70, the fuel in the delivery pipe 24 can be heated by energizing the heater 26 during cold start. Thereby, the temperature of the fuel supplied to the fuel injector 22 can be raised. For this reason, even when fuel with high ethanol concentration that is difficult to vaporize at low temperatures is used, fuel vaporization failure during cold start can be prevented, so startability and emission characteristics can be improved. Can do.
- a fuel property sensor unit 28 is installed in the fuel passage 30 near the inlet of the delivery pipe 24.
- the fuel property sensor unit 28 includes an electrode for detecting capacitance and a temperature sensor for detecting the temperature of fuel between the electrodes.
- the configuration of the electrodes and the temperature sensor can be the same as the configuration shown in FIG. 1 or FIG. 2, for example. However, the fuel property sensor unit 28 is not provided with the heater 18.
- FIG. 9 is a diagram schematically showing another example of the device configuration according to the second embodiment of the present invention.
- the fuel property sensor unit 28 may be installed in the delivery pipe 24 itself. Except for this point, the configuration of FIG. 9 is the same as the configuration of FIG. This embodiment can be realized by using either the configuration of FIG. 8 or the configuration of FIG. The following description is common to the configuration of FIG. 8 and the configuration of FIG. 9 unless otherwise specified.
- the ECU 50 determines the ethanol concentration of the fuel supplied to the engine 70 through the fuel passage 30 based on the capacitance and fuel temperature detected by the fuel property sensor unit 28 and the ethanol concentration calculation map shown in FIG. Can be calculated.
- whether or not there is an abnormality in the ethanol concentration detection apparatus is determined as follows. As described above, since the relative dielectric constant of ethanol varies with temperature, the capacitance varies with fuel temperature even if the ethanol concentration is the same. For this reason, the ethanol concentration is calculated by performing correction processing based on the fuel temperature using the ethanol concentration calculation map shown in FIG.
- the ethanol concentration is calculated based on the capacitance detected at two points with different fuel temperatures, and whether or not the ethanol concentration detection device is abnormal is determined based on whether the ethanol concentrations match. It was decided to. If the ethanol concentration detector is normal, the ethanol concentrations measured at two points where the fuel temperature is different should match. For this reason, when the ethanol concentrations measured at two points with different fuel temperatures do not match, it can be determined that there is an abnormality in the ethanol concentration detection device. If there is an abnormality in the ethanol concentration detection device, it is unlikely that two ethanol concentration values obtained from different capacitance values detected at two points with different fuel temperatures coincide by chance. Therefore, if the ethanol concentrations measured at two points with different fuel temperatures match, the ethanol concentration detector can be determined to be normal.
- the measurement of the ethanol concentration at the two points where the fuel temperatures are different as described above is performed using the opportunity that the heater 26 is operated when the engine 70 is cold started. That is, the fuel temperature in the fuel property sensor unit 28 is low before the operation of the heater 26 and is high after the operation of the heater 26. Therefore, by detecting the ethanol concentration at each time point, Measurements of ethanol concentration at points can be obtained.
- FIG. 10 is a flowchart of a routine that is executed when the ECU 50 requests to start the engine 70 in the present embodiment in order to realize the above function.
- the routine shown in FIG. 10 first, whether or not the engine coolant temperature detected by a water temperature sensor (not shown) is equal to or lower than a predetermined cold determination value and detected by a temperature sensor in the fuel property sensor unit 28. It is determined whether the fuel temperature is equal to or lower than a predetermined cold determination value (step 200).
- step 200 if at least one of the engine coolant temperature and the fuel temperature is greater than the cold determination value, it is determined that the engine 70 is in a warm state. In this case, even if the fuel in the delivery pipe 24 is not preheated, it can be determined that there is no adverse effect on startability and emission. Therefore, in this case, the engine 70 is started without energizing the heater 26 (step 214).
- the capacitance is detected by the electrode in the fuel property sensor unit 28 under the fuel temperature T1 at this time, and the ethanol concentration E1 is calculated based on the ethanol concentration calculation map (step 202). .
- the heater 26 is energized to heat the fuel in the delivery pipe 24 (step 204).
- the fuel temperature between the electrodes in the fuel property sensor unit 28 immediately rises as the fuel in the delivery pipe 24 is heated. Further, even in the case of the configuration shown in FIG. 8, the heat applied by the heater 26 is easily obtained since the engine 70 is not started at this point and there is no fuel flow in the delivery pipe 24 and the fuel passage 30. This is transmitted to the fuel property sensor unit 28, and the fuel temperature between the electrodes rises.
- step 204 the energization amount of the heater 26 is controlled so that the fuel temperature in the delivery pipe 24 falls within a predetermined range based on the temperature detected by the temperature sensor in the fuel property sensor unit 28. It may be. This reliably prevents the fuel temperature in the delivery pipe 24 from rising to the fuel temperature necessary for eliminating the vaporization failure at the start, or from being increased more than necessary and losing energy. be able to.
- the capacitance is detected by the electrode in the fuel property sensor unit 28 under the fuel temperature T2 detected at this time, and based on the ethanol concentration calculation map.
- the ethanol concentration E2 is calculated (step 206). As described above, since the fuel temperature in the vicinity of the fuel property sensor unit 28 is increased by the heat from the heater 26, the fuel temperature T2> the fuel temperature T1.
- of the difference between the ethanol concentration E1 calculated in the above step 202 and the ethanol concentration E2 calculated in the above step 206 is from a predetermined value determined as a normal error range.
- the failure content of the ethanol concentration detection device may be an abnormality in the capacitance detection value, an abnormality in the temperature correction process, or the like.
- failure detection is performed based on the detected ethanol concentration values at two fuel temperatures, but failure detection is performed by comparing the ethanol concentration values detected at three or more points with different fuel temperatures. You may do it.
- the engine 70 is started (step 214).
- the failure detection can be performed by using the operation of the heater 26 at the cold start, and it is not necessary to perform the fuel heating only for the failure detection, so that the energy loss is small. . Further, the failure detection is performed in a state where the fuel is not flowing before starting the engine, and the fuel property sensor unit is calculated when the ethanol concentration E1 is calculated at the fuel temperature T1 and when the ethanol concentration E2 is calculated at the fuel temperature T2. There is no possibility that the actual ethanol concentration near 28 will change. For this reason, erroneous determination can be reliably prevented.
- the failure detection control similar to the above may be performed by operating the heater 26 not only when the engine 70 is cold started but also at any time during the operation of the engine 70.
- the failure detection control described in the present embodiment is not limited to being performed using the heater 26 of the delivery pipe 24. That is, the same failure detection control as described above may be performed by providing the fuel property sensor unit 28 with the heater 18 and operating the heater 18 in the same manner as the apparatus configuration shown in FIG. 1 or FIG. In this case, the installation location of the fuel property sensor unit 28 is not particularly limited, and the fuel property sensor unit 28 may be installed at a location other than the delivery pipe 24.
- the fuel is not limited to the electrostatic capacity but based on the physical property value or the physical quantity having the temperature-dependent characteristic. As long as the device detects the property, any device failure can be detected in the same manner as described above.
- the ethanol concentration detection device fuel property detection device
- the fuel property sensor unit 28 corresponds to the “sensor unit” in the first and seventh inventions. Further, the “failure determination means” in the second invention and the sixth invention is realized by the ECU 50 executing the processing of the routine of FIG.
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Abstract
Description
内燃機関に燃料を供給する燃料通路に配置されたセンサ部を有し、前記燃料通路を通る燃料の性状を検出する燃料性状検出装置と、
前記センサ部近傍の燃料温度を検出する温度検出手段と、
前記センサ部近傍の燃料温度を上昇させることのできるヒータと、
前記ヒータが作動したときに前記温度検出手段により検出された温度に基づいて、前記燃料性状検出装置の異常の有無を判定する異常判定手段と、
を備えることを特徴とする。
前記異常判定手段は、前記センサ部近傍の燃料流れの異常の有無を判定する燃料流れ異常判定手段と、前記燃料性状検出装置自体の故障の有無を判定する故障判定手段とを含み、前記燃料流れ異常判定手段によって前記センサ部近傍の燃料流れに異常がないと判定された場合に、前記故障判定手段による判定を実行することを特徴とする。
前記異常判定手段は、前記センサ部近傍の燃料流れの異常の有無を判定する燃料流れ異常判定手段を含み、
前記燃料流れ異常判定手段は、
前記燃料通路を通る燃料流量を取得する流量取得手段と、
前記ヒータによるエネルギー投入量を取得するエネルギー投入量取得手段と、
前記エネルギー投入量と前記燃料流量とに基づいて、前記温度検出手段が検出すると推定される温度を算出する温度推定手段と、
前記温度推定手段により算出された推定温度と、前記温度検出手段により実際に検出された温度とを比較することにより、前記センサ部近傍の燃料流れの異常の有無を判定する手段と、
を含むことを特徴とする。
前記燃料流れ異常判定手段の判定の実行に先立って前記燃料通路を通る燃料流量を増加させる制御を行う流量増加手段を備えることを特徴とする。
前記燃料通路を通る燃料流量が所定値より低い場合に、前記燃料流れ異常判定手段による判定の実行を回避させる回避手段を備えることを特徴とする。
前記異常判定手段は、前記燃料性状検出装置自体の故障の有無を判定する故障判定手段を含み、
前記センサ部は、温度依存特性を有する値を検出するものであり、
前記燃料性状検出装置は、前記センサ部により検出された値に対し、前記温度検出手段により検出された燃料温度に基づく補正処理を施すことによって燃料性状値を算出する温度補正手段を含み、
前記故障判定手段は、前記ヒータが作動したときに前記燃料温度が異なる複数の点において前記補正処理が施された燃料性状値を取得し、それら各点の燃料性状値間の誤差に基づいて、前記燃料性状検出装置の故障の有無を判定することを特徴とする。
前記センサ部は、前記内燃機関の各気筒の燃料インジェクタに燃料を分配する燃料分配通路またはその近傍に配置されており、
前記ヒータは、前記燃料分配通路内の燃料を加熱可能であることを特徴とする。
前記故障判定手段は、前記内燃機関の冷間始動時に前記ヒータが作動される機会を利用して前記判定を実行することを特徴とする。
前記内燃機関の冷間始動時に、前記温度検出手段により検出された燃料温度に基づいて前記ヒータへの通電を制御する手段を備えることを特徴とする。
図1は、本発明の実施の形態1の装置構成を模式的に示す図である。本実施形態の装置は、バイオマスに由来する成分(本実施形態では、エタノールとする)を含有した燃料が使用される自動車に搭載され、その含有される成分の濃度を検出する機能を有するものである。
Ts+α<T ・・・(1)
次に、図8乃至図10を参照して、本発明の実施の形態2について説明するが、上述した実施の形態1との相違点を中心に説明し、同様の事項については、その説明を簡略化または省略する。
14 温度センサ
18 ヒータ
20 孔
22 燃料インジェクタ
24 デリバリパイプ
26 ヒータ
28 燃料性状センサユニット
30,60 燃料通路
50 ECU
70 エンジン
Claims (9)
- 内燃機関に燃料を供給する燃料通路に配置されたセンサ部を有し、前記燃料通路を通る燃料の性状を検出する燃料性状検出装置と、
前記センサ部近傍の燃料温度を検出する温度検出手段と、
前記センサ部近傍の燃料温度を上昇させることのできるヒータと、
前記ヒータが作動したときに前記温度検出手段により検出された温度に基づいて、前記燃料性状検出装置の異常の有無を判定する異常判定手段と、
を備えることを特徴とする燃料性状検出装置の異常検出装置。 - 前記異常判定手段は、前記センサ部近傍の燃料流れの異常の有無を判定する燃料流れ異常判定手段と、前記燃料性状検出装置自体の故障の有無を判定する故障判定手段とを含み、前記燃料流れ異常判定手段によって前記センサ部近傍の燃料流れに異常がないと判定された場合に、前記故障判定手段による判定を実行することを特徴とする請求項1記載の燃料性状検出装置の異常検出装置。
- 前記異常判定手段は、前記センサ部近傍の燃料流れの異常の有無を判定する燃料流れ異常判定手段を含み、
前記燃料流れ異常判定手段は、
前記燃料通路を通る燃料流量を取得する流量取得手段と、
前記ヒータによるエネルギー投入量を取得するエネルギー投入量取得手段と、
前記エネルギー投入量と前記燃料流量とに基づいて、前記温度検出手段が検出すると推定される温度を算出する温度推定手段と、
前記温度推定手段により算出された推定温度と、前記温度検出手段により実際に検出された温度とを比較することにより、前記センサ部近傍の燃料流れの異常の有無を判定する手段と、
を含むことを特徴とする請求項1または2記載の燃料性状検出装置の異常検出装置。 - 前記燃料流れ異常判定手段の判定の実行に先立って前記燃料通路を通る燃料流量を増加させる制御を行う流量増加手段を備えることを特徴とする請求項2または3記載の燃料性状検出装置の異常検出装置。
- 前記燃料通路を通る燃料流量が所定値より低い場合に、前記燃料流れ異常判定手段による判定の実行を回避させる回避手段を備えることを特徴とする請求項2または3記載の燃料性状検出装置の異常検出装置。
- 前記異常判定手段は、前記燃料性状検出装置自体の故障の有無を判定する故障判定手段を含み、
前記センサ部は、温度依存特性を有する値を検出するものであり、
前記燃料性状検出装置は、前記センサ部により検出された値に対し、前記温度検出手段により検出された燃料温度に基づく補正処理を施すことによって燃料性状値を算出する温度補正手段を含み、
前記故障判定手段は、前記ヒータが作動したときに前記燃料温度が異なる複数の点において前記補正処理が施された燃料性状値を取得し、それら各点の燃料性状値間の誤差に基づいて、前記燃料性状検出装置の故障の有無を判定することを特徴とする請求項1乃至5の何れか1項記載の燃料性状検出装置の異常検出装置。 - 前記センサ部は、前記内燃機関の各気筒の燃料インジェクタに燃料を分配する燃料分配通路またはその近傍に配置されており、
前記ヒータは、前記燃料分配通路内の燃料を加熱可能であることを特徴とする請求項6記載の燃料性状検出装置の異常検出装置。 - 前記故障判定手段は、前記内燃機関の冷間始動時に前記ヒータが作動される機会を利用して前記判定を実行することを特徴とする請求項7記載の燃料性状検出装置の異常検出装置。
- 前記内燃機関の冷間始動時に、前記温度検出手段により検出された燃料温度に基づいて前記ヒータへの通電を制御する手段を備えることを特徴とする請求項7または8記載の燃料性状検出装置の異常検出装置。
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JP2012500432A JP5240397B2 (ja) | 2010-02-19 | 2010-02-19 | 燃料性状検出装置の異常検出装置 |
US13/521,939 US8683853B2 (en) | 2010-02-19 | 2010-02-19 | Apparatus for detecting abnormality for fuel property detecting apparatus |
PCT/JP2010/052528 WO2011101980A1 (ja) | 2010-02-19 | 2010-02-19 | 燃料性状検出装置の異常検出装置 |
EP10846117.9A EP2538059B1 (en) | 2010-02-19 | 2010-02-19 | Abnormality detection device for fuel property detection device |
CN2010800641956A CN102770643B (zh) | 2010-02-19 | 2010-02-19 | 燃料性状检测装置的异常检测装置 |
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JP4978736B2 (ja) * | 2009-05-01 | 2012-07-18 | トヨタ自動車株式会社 | 燃料性状判別装置 |
DE102010048311A1 (de) * | 2010-10-14 | 2012-04-19 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
WO2012090316A1 (ja) * | 2010-12-28 | 2012-07-05 | トヨタ自動車株式会社 | 内燃機関の異常検出装置 |
EP2660447B1 (en) * | 2010-12-28 | 2016-10-19 | Toyota Jidosha Kabushiki Kaisha | Abnormality detection device for internal combustion engines |
US9004050B2 (en) * | 2012-04-19 | 2015-04-14 | Ford Global Technologies, Llc | Gaseous fuel rail sensor diagnostics |
JP5614660B2 (ja) * | 2012-07-19 | 2014-10-29 | 株式会社デンソー | 燃料性状センサ |
AU2014406491B2 (en) * | 2014-09-18 | 2018-01-25 | Micro Motion, Inc. | Method and apparatus for determining differential density |
KR101827131B1 (ko) * | 2016-07-15 | 2018-02-07 | 현대자동차주식회사 | 차량의 연료 가열 장치 및 그 방법 |
CN112922743B (zh) * | 2021-02-01 | 2022-04-08 | 中国科学院力学研究所 | 一种碳氢燃料加热装置 |
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