US20050000268A1 - Failure detection device for a rotation angle detection sensor - Google Patents

Failure detection device for a rotation angle detection sensor Download PDF

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Publication number
US20050000268A1
US20050000268A1 US10/828,505 US82850504A US2005000268A1 US 20050000268 A1 US20050000268 A1 US 20050000268A1 US 82850504 A US82850504 A US 82850504A US 2005000268 A1 US2005000268 A1 US 2005000268A1
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United States
Prior art keywords
failure
detection element
detection
range
predetermined value
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Abandoned
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US10/828,505
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English (en)
Inventor
Masayuki Kuwata
Toru Niinomi
Katsutoshi Komatsu
Masao Saitou
Kenji Suzuki
Tomokazu Nomura
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Aisin AW Co Ltd
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Aisin AW Co Ltd
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Publication date
Application filed by Aisin AW Co Ltd filed Critical Aisin AW Co Ltd
Assigned to AISIN AW CO., LTD. reassignment AISIN AW CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUZUKI, KENJI, KOMATSU, KATSUTOSHI, KUWATA, MASAYUKI, NIINOMI, TORU, NOMURA, TOMOKAZU, SAITOU, MASAO
Publication of US20050000268A1 publication Critical patent/US20050000268A1/en
Priority to US11/441,015 priority Critical patent/US7552615B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/08—Range selector apparatus
    • F16H59/10—Range selector apparatus comprising levers
    • F16H59/105—Range selector apparatus comprising levers consisting of electrical switches or sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1284—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
    • F16H61/0006—Electronic control units for transmission control, e.g. connectors, casings or circuit boards

Definitions

  • This invention relates to a failure detection device for detecting failure of a rotation angle detection sensor, which sensor detects the angular position of a rotatable member.
  • an electronic control unit for the transmission responds by controlling solenoids, for example, utilizing a shifting logic for the selected range, and thereby executes the shift control.
  • solenoids for example, utilizing a shifting logic for the selected range
  • the ECU determines and confirms the selected range.
  • Conventional rotational position sensors include a non-contact type position sensor which detects without contact, the rotation angle of a movable-side terminal attached to a manual shaft rotated by a shift lever.
  • the movable-side terminal is rotated together with the manual shaft, and its angle of rotation is detected and a voltage corresponding to the rotational angle is output by the non-contact sensor.
  • the ECU compares the output value from the non-contact type position sensor with a predetermined value (i.e. a threshold value) for each range, which predetermined value is set in advance and consists of a voltage value. Then, the ECU recognizes the pattern of the range and thus determines the selected range.
  • a predetermined value i.e. a threshold value
  • Such a non-contact type rotational position sensor can generate stable output over the long term because there is little abrasion. (See, for example, U.S. Pat. No. 5,846,160.)
  • Non-contact type rotational position sensors are also used in other automotive applications.
  • One example is a non-contact type throttle-opening sensor for detecting throttle opening, i.e. angle of rotation of a throttle valve in an internal combustion engine.
  • the non-contact type throttle-opening sensor includes two Hall effect transistors as detection elements (“detectors”). These two Hall effect transistors have input-output characteristics with different absolute values for inclination of a linear output. If the relationship of the output voltages of the two Hall effect transistors is outside of a predetermined range for error in a map, it is determined that one of the Hall effect transistors has failed.
  • control in an automatic transmission involves control of a shift from a present position (i.e. range) to another position. It is required that a failure, for example failure of an angular position sensor, should be detected while shifting from a present position to another position.
  • a failure for example failure of an angular position sensor
  • the non-contact type angular position sensor disclosed in the aforementioned Japanese laid open patent, is applied as a throttle opening sensor in an engine, not in control of an automatic transmission.
  • one object of the present invention is to provide a failure detection device for an angular position sensor, which can assure detection of a failure, for example, failure of a detection element for detecting a rotational angle and to also assure accurate control of failure detection.
  • Another object of the invention is to provide a failure detection device for an angular position sensor, with a simplified logic for detecting the failure and for accurate control of the failure detection.
  • the present invention provides a failure detection device for detecting a failure of an angular position sensor, the failure detection device comprising: a first detection element, which has an output which increases as the rotational angle of a rotary member increases; a second detection element, which has an output which decreases as the rotational angle of the rotary member increases; detecting means for detecting failure of either the first detection element or the second detection element, wherein the detecting means compares a value calculated from the outputs of both of the first and second detection elements with a predetermined value set in advance, and thereby determines a failure of either the first detection element or the second detection element.
  • the present invention provides a failure detection device for detecting a failure of an angular position sensor, which detects the rotational angle of a rotary member, the failure detection device comprising: a first detection element; a second detection element; detecting means for detecting the failure of either the first detection element or the second detection element, wherein the detecting means determines that one of the first and second detection elements has failed if output of the one detection element does not change while output of the other detection element is changing.
  • FIG. 1 ( a ) and FIG. 1 ( b ) are diagrams of a failure detection device for an angular position sensor, applied to an automatic transmission, according to a first embodiment of the invention
  • FIG. 2 is a graph explaining failure detection of an angular position sensor using two Hall effect transistors as detection elements as the failure detection device shown in the FIG. 1 ;
  • FIG. 3 is a block diagram of the failure detection device for an angular position sensor, shown in FIG. 1 ;
  • FIG. 4 is a flow chart of a routine for detection of failure of an angular position sensor
  • FIG. 5 is a graph for the other embodiment of the invention, explaining detection of failure of an angular position sensor, using two Hall effect transistors as detection elements.
  • FIG. 1 ( a ) is a diagram of a failure detection device for an angular position sensor, applied to an automatic transmission, according to a first embodiment of the invention
  • FIG. 1 ( b ) is a sectional view along the line IB-IB in FIG. 1 ( a ).
  • a failure detection device 1 for an angular position (rotational angle) sensor is applied in an A/T (automatic transmission).
  • the position sensor failure detection device 1 is attached to a manual shaft 3 external to A/T case 2 .
  • the position sensor failure detection device 1 comprises angular position sensor 5 including first and second Hall effect transistors 4 a and 4 b as detection elements, an electronic control unit 6 (ECU, corresponding to a control unit in the embodiment of the invention) for controlling the A/T, A/T solenoids controlled by the ECU 6 , a connecter 7 including plural terminals for connecting to plural controlled devices (i.e. an engine, an indicator), and an ECU case 8 .
  • the angular position sensor 5 further comprises an annular internal core 9 , made of soft magnetic material and fixed to the manual shaft 3 , and an annular external core 10 , made of soft magnetic material and fixed, concentric with the internal core 9 , to the ECU case 8 .
  • An annular magnet 11 is fixed around the outer circumference of the internal core 9 and the internal core 9 and the magnet 11 are rotating together with the manual shaft 3 .
  • the external core 10 includes a pair of cores 10 a , 10 b , each of which has a semicircle shape, and these cores 10 a , 10 b are arranged so that the ends of the cores 10 a , 10 b face each other across a predetermined space. Within this predetermined space, the aforementioned first and second Hall effect transistors (“detection elements”) 4 a , 4 b are respectively disposed.
  • a N-pole portion 11 a of the magnet 11 faces the first detection element 4 a and a S-pole portion faces the second detection element 4 b .
  • the N-pole portion 11 a of the magnet 11 and the first detection element 4 a form a first position sensor and the S-pole portion 11 b of the magnet 11 and the second detection element 4 b form a second position sensor in this first embodiment of the invention.
  • the first and the second detection elements 4 a , 4 b of the position sensor 5 and the ECU 6 are disposed inside of the ECU case 8 and are electrically connected with each other, whereby the ECU 6 is integrated with the position sensor 5 .
  • the position sensor 5 and the ECU 6 can be separate from each other, not integrated in the ECU case 8 , and be electrically connected with each other.
  • the connector 7 is attached to the ECU case 8 and is electrically connected to the ECU 6 .
  • the ECU for the A/T is connected to the ECU for the engine.
  • the manual shaft 3 is connected to a shift lever through, for example, a lever and a wire external to the A/T case 2 , and is further connected to a spool of a manual valve inside of the A/T case 2 .
  • the position sensor 5 is a non-contact type position sensor, wherein magnet 11 does not contact either the first or second detection element 4 a , 4 b .
  • the first and second detection elements 4 a , 4 b continuously output, respectively, the first sensor voltage value and the second sensor voltage value as shift position detection signals, on the basis of the degree of rotation, i.e., rotational angle, of N-pole portion 11 a and S-pole portion 11 b of the magnet 11 , corresponding respectively to the first and second detection elements 4 a , 4 b.
  • the first detection element 4 a has linear input-output characteristics. That is, the first sensor output voltage (V) continuously increases linearly with increase of the input-side position sensor angle (i.e. rotational angle of the N-pole detection element 4 a ). Also, the first sensor output voltage continuously decreases linearly with decrease of the input-side sensor positional angle.
  • the second detection element 4 b has characteristics the opposite of those of the first detection element 4 a. That is, the second sensor output voltage (V) continuously decreases linearly with the increase of the input-side sensor position angle (i.e. rotational angle of the S-pole detection element 4 b ).
  • the second sensor output voltage continuously increases linearly with decrease of the input-side sensed angular position.
  • the absolute values of inclination of the linear input-output characteristics of the first and second detection elements 4 a and 4 b are equal.
  • the absolute values for inclination can be set differently. In this first embodiment, the absolute values for inclination are set equal as shown in FIG. 2 .
  • the automatic transmission to which the position sensor failure detection device 1 of this embodiment is applied, has four ranges, such as a parking range (P range), a reverse range (R range), a neutral range (N range), a drive range (D range).
  • Other ranges such as a fourth-speed range, a third-speed range, a second-speed range, can also be provided. This first embodiment will be described with reference to an A/T having the aforementioned four ranges.
  • a voltage value (V) is set.
  • FIG. 2 shows the angular position for each shift area delineated by vertical dotted lines.
  • FIG. 2 shows the angular position for each range, as set in the A/T, as vertical solid lines, and shows voltage values corresponding to these ranges of angular position.
  • the sensor voltage value for the P range is set as V 1P (V) for the first detection element 4 a and as V 2P (V) for the second detection element 4 b .
  • the sensor voltage value for the R range is set as V 1R (V) for the first detection element 4 a and as V 2R (V) for the second detection element 4 b .
  • the position sensor voltage values for the N range and D range are set on the basis of the lines ⁇ , ⁇ in the same way. By detecting the angular position, the selected range is determined.
  • a normal usage area for the first and second detection elements 4 a , 4 b is set as a range of angular positions extending from the shift start of the P range to the shift completion of the D range.
  • the normal usage area of the first detection element 4 a is between V 1n1 (V) and V 1n2 (V) and the normal usage area for the second detection element 4 b is between V 2n1 (V) and V 2n2 (V).
  • an angular position range “a” (i.e. a range interval) is set between the P range and the R range, set as “b” between the R range and the N range, and set as “c” between the N range and the D range.
  • the sizes of these ranges are set as b ⁇ c ⁇ a.
  • the size of the interval for each pair of adjacent ranges is not limited to the foregoing relationship and can be optionally set.
  • the ECU 6 includes position sensor failure detection logic 9 and a position sensor fail-safe control unit 10 .
  • the position sensor failure detection logic 9 detects a sticking failure of the position sensor. In this sticking failure detection logic, a sticking failure of either the first or second detection element 4 a or 4 b is determined and detected on the basis of total of the sensor voltage values, output from the first and second detection elements 4 a , 4 b .
  • the ECU 6 detects a sticking failure before the adjacent range is determined and outputs a signal indicating sensor failure to the position sensor fail-safe control unit 10 .
  • the above-mentioned predetermined value for the determination of a sticking failure is set as follows.
  • a standard range for the angle detected by the angular position sensor, to be taken as detection of a sticking failure is set on the basis of the smallest angle (i.e. narrowest width) between ranges.
  • the smallest angle or interval between ranges is that between the R range and the N range, shown as d, and as being smaller than the angle interval b, in FIG. 2 .
  • a sensor output voltage corresponding to the standard interval d is determined.
  • the first and second predetermined values are equal to A both in the direction of increase in the sensed position angle and in the direction of decrease in the sensed position angle. (Hereinafter, this “A” is referred to as “predetermined value A”).
  • the first and second predetermined values are set differently as described later.
  • the total value of the sensor output voltages of detection elements 4 a , 4 b is V 1PR +V 2PR .
  • the ECU 6 determines selection of the R range and performs control for the R range as in a conventional A/T.
  • the output voltage of the first detection element 4 a increases linearly, and that of the second detection element 4 b decreases by the same amount as the increase in the value of the output voltage of the first detection element 4 a.
  • the total value of the output voltages of the first and second detection elements 4 a , 4 b does not change.
  • the total of the sensor output voltages of the first and second detection elements 4 a and 4 b does not change, although the increase and decrease of the output voltages are the opposite of the aforementioned situation in which a shift is made in such a direction that the sensed angle increases.
  • the ECU 6 determines other range selections in the same way, and performs control for the determined range as in the conventional A/T.
  • the rotary elements 11 a , 11 b of the first detection element 4 a and the second detection element 4 b rotate in the same way as described above. If a sticking failure occurs in the second detection element 4 b at a position within the P range, the sensor voltage value of the first detection element 4 a increases along the solid line a as described above. However, the output voltage of the second detection element 4 b does not change (i.e. does not decrease), and remains V 2P .
  • the position sensor failure detection logic 9 compares the absolute value of this difference with the predetermined value A corresponding to the second detection element 4 b . If the absolute value of this difference becomes larger than the predetermined value A, the position sensor failure detection logic 9 determines that a sticking failure has occurred in the second detection element 4 b and outputs the thus determined sensor failure information to the position sensor fail-safe control unit 10 .
  • the position sensor failure detection logic 9 detects a sticking failure of the second detection element 4 b if such a failure has occured. This is because the predetermined value A, which is determined by the standard angular spacing d set based on the aforementioned smallest range spacing (i.e. interval between the R range and the N range), is used.
  • a sticking failure of the second detection element 4 b is detected at the time of a shift operation that increases the position angle, from another range (other than the P range), to an adjacent range.
  • sticking failure of the first detection element 4 a in a shift operation in which the position angle increases, can also be detected before the adjacent range is set.
  • the difference between the total voltage output of both angular position sensors 4 and a total sensor voltage output value for both position sensors 4 in normal operation becomes negative. Therefore, the predetermined value for detection of a sticking failure is the value A corresponding to the first detection element 4 a.
  • a sticking failure in the first or second detection element 4 a , 4 b is detected before the adjacent range is determined.
  • the absolute value of the difference as mentioned above, and the predetermined value are compared. Therefore, a predetermined value corresponding to each of the first and the second detection elements 4 a , 4 b, like the case where the position sensor angle increases, is used as the predetermined value to detect a sticking failure of the first or the second detection element 4 a , 4 b.
  • the position sensor fail-safe control unit 10 executes a fail-safe control routine and prohibits setting of the next range for the A/T. In this situation, the sensor failure information is input before the next range is determined. Therefore, even if the next range is accidentally determined, control setting the next range for the A/T is reliably prevented.
  • the output voltage of a sensor changes with factors such as temperature. Therefore, to reduce the effect of change in temperature, etc., a control system that limits sensor output voltage by execution of a software program for detection of sticking failure is employed only in an area where high sensor accuracy is required.
  • the aforementioned position sensor sticking failure detection device 1 can be applied.
  • the aforementioned standard width d as the predetermined value for detecting a failure, is set smaller, and a predetermined value B, which is set smaller than the aforementioned predetermined value A, is used.
  • a predetermined value B is set corresponding to each of the first and second detection elements 4 a , 4 b.
  • FIG. 4 is a flow chart of a routine for detection of failure of the position sensor.
  • step S 1 when execution of the failure detection starts, at step S 1 , present sensor output voltages of the first and second detection elements 4 a , 4 b are obtained.
  • step S 2 it is determined if each sensor voltage (values for both 4 a and 4 b ) is within an area of normal operation (i.e., V 1n1 V 1n2 for the first detection element 4 a and V 2n2 V 2n1 for the second detection element 4 b ). If it is determined that each sensor voltage is within the area of normal operation, it is determined, at step S 3 , if one of the sensor voltages is within an area in which increased sensor accuracy is required.
  • step S 4 If it is determined that both sensor voltages are outside of that area, it is determined, at step S 4 , if the absolute value of the difference between the total of the sensor voltages, i.e., voltage outputs of the first and second detection elements 4 a , 4 b, and the value of total sensor voltage in normal operation, is larger than the predetermined value A. If is determined that the absolute value of the difference is smaller than the predetermined value A, it is determined, at step S 5 , that both detection elements 4 a , 4 b , are operating normally, and the sticking failure detection routine ends.
  • step S 4 If it is determined, at step S 4 , that the aforementioned difference is larger than the predetermined value A, a sticking failure or an oscillation failure of the position sensor is detected, at step S 6 , on the basis of whether the aforementioned difference is positive or negative and on the basis of direction of increase or decrease of the sensed position angle. Also, the position sensor which has failed is detected, and the sticking failure detection routine ends.
  • step S 3 if it is determined, at step S 3 , that one of the sensor voltages is within the area in which sensor accuracy is to be increased, it is deter-mined, at step S 7 , if the absolute value of the difference between the total of voltage outputs of the first and second detection elements 4 a , 4 b , and the value for total voltage in normal operation, is larger than the predetermined value B. If is determined that the absolute value of the difference is smaller than the predetermined value B, it is determined, at step S 8 , that both detection elements 4 a , 4 b are operating normally and execution of the sticking failure detection routine ends.
  • step S 7 If it is determined, at step S 7 , that the aforementioned difference is larger than the predetermined value B, a sticking failure or an oscillation failure of the position sensor is detected at step S 9 , on the basis of the positive or negative value of the aforementioned difference and the direction of the increase or decrease of the sensed position angle. Also, the position sensor which has failed is identified and the failure detection routine is ended. Further, if it is determined, at step S 2 , that each sensor voltage value is outside of the normal usage area, it is determined, at step S 10 , that the position sensor failure is other than a sticking failure, e.g., a failure such as disconnection of the sensor or a short circuit, and the sticking failure detection routine is ended.
  • a sticking failure e.g., a failure such as disconnection of the sensor or a short circuit
  • the absolute value of the difference between the total of the output voltages of the first and second detection elements 4 a , 4 b , which have characteristics of opposing inclinations and the total voltage outputs of the first and second detection elements 4 a , 4 b in normal operation, is compared with a predetermined value A or B. Therefore, as the total voltage for the first and second detection elements can be made different according to which position sensor has failed, the aforementioned difference can also be made different. Thus, a sticking failure of the first and second detection elements 4 a , 4 b can be reliably detected before a shift to the next range is determined.
  • the input-output characteristics of the first and second detection elements 4 a , 4 b have opposite linear inclinations and the absolute values of the inclinations are equal to each other. Therefore, the predetermined values for the first and second detection elements 4 a , 4 b can be set equal to each other. Thus, the control of the sticking failure detection can be performed more easily and more accurately.
  • the predetermined values A, B are set on the basis of the smallest angle range (interval), between adjacent ranges, e.g., that between R and N range. Therefore, in any range, when a sticking failure occurs in the position sensor, that failure can be reliably detected before the next adjacent range is determined. Thus, for any range, when a sticking failure is detected before the next range is determined, some action to cope with the failure of the position sensor can be taken, such as fail-safe control prohibiting shift control for the A/T. In addition, erroneous determination by the ECU 6 of the range selected for the A/T is prevented.
  • the outputs of the first and second detection elements 4 a , 4 b are set with opposite inclinations and the same absolute value of inclination
  • the output can also be set with inclinations opposite from each other and different absolute values of inclination.
  • the predetermined value set in consideration of the accuracy needed for the first and second detection elements 4 a , 4 b .
  • first predetermined values A 1 and B 1 are set corresponding to the first detection element 4 a
  • second predetermined values A 2 and B 2 are set corresponding to the second detection element 4 b .
  • Which predetermined value is selected is based on the direction of the increase or decrease of the sensed position angle, or whether the aforementioned difference is positive or negative.
  • the predetermined value can also be selected based on rate of change of the total of voltage outputs of the first and second detected elements 4 a , 4 b .
  • a sticking failure can be detected by comparing the difference (i.e. subtracted value) of the first output voltage of the first detecting element 4 a and the second output voltage of the second detection element 4 b , and the predetermined value. That is, a sticking failure can also be detected by comparing the calculated value (such as, total value obtained by addition, subtracted value, multiplied value, divided value, etc.) of the first output voltage of the first detection element 4 a and the second output voltage of the second detection element 4 b , and the predetermined value, corresponding to the calculated value.
  • FIG. 5 shows another embodiment of the invention, similar to that of FIG. 2 .
  • the same elements as in the previous embodiment are denoted by the same reference numerals and a detailed explanation is omitted for convenience of explanation.
  • the inclinations of the input-output characteristics of the first and second detection elements 4 a , 4 b are in opposite directions and a sticking failure is detected by comparing the calculated value (such as, total of addition, subtracted value, multiplied value, divided value, etc.) of the first output voltage value of the first detection element 4 a and the second output voltage value of the second detection element 4 b , with the predetermined value corresponding to the calculated value.
  • the calculated value such as, total of addition, subtracted value, multiplied value, divided value, etc.
  • the sticking failure detection device 1 for the position sensor detects that while one sensor output voltage value, output from one of the first and second detection elements 4 a , 4 b , is changing the other output voltage, output from the other detection element, is hardly changing. In this manner, it can be detected that it is the other detection element which has failed.
  • the sticking failure detection device 1 for the position sensor includes the first and second detection elements 4 a , 4 b , having input-output characteristics with inclinations having the same direction and different absolute values. If the shift lever is moved toward the R range position while the second detection element 4 b experiences a sticking failure, i.e., sticks in the P range position, the first output voltage of the first detection element 4 a increases as the rotational angle of the sensed position increases as indicated by the thick solid arrow in FIG. 5 . On the other hand, the second output voltage, output from the second detection element 4 b in a state of failure, hardly changes as the sensed rotational angle increases, shown as a thick dashed arrow in FIG. 5 . Thus, based on the fact that, although the first output voltage increases, the second output voltage hardly changes, a sticking failure of the second detection element 4 b is decided by the A/T ECU 6 .
  • this second embodiment operates without comparing the first and second output voltages, from the first and second detection elements 4 a , 4 b , with predetermined values. Instead, simply by detecting that one output voltage is changing, while the other sensor voltage value hardly changes, a sticking failure of the detection elements is easily and reliably determined. Therefore, a logic for comparing and calculating the sensor voltage outputs with predetermined values becomes unnecessary, and the logic can be simplified and the control for detecting a sticking failure can be made more accurate. Other structures and advantages of the sticking failure detection device in this second embodiment are same as those of the first embodiment.
  • first and second detection elements 4 a , 4 b having characteristics (output voltage verses angle of rotation) with inclinations in the same direction and the same absolute values can be used.
  • the first and second detection elements 4 a , 4 b can have characteristics with inclinations in opposite directions and the same or different absolute values.
  • the invention is not so limited.
  • the invention can be applied to any device controlled by an ECU responsive to output voltage from a position sensor.
  • the invention can be applied to other types of transmissions, such as continuously variable transmissions (CVT).
  • CVT continuously variable transmissions
  • the setting for each range is also not limited to those of the aforementioned embodiments, and can be optionally set.
  • the invention is not limited to a transmission, but can be applied to any type of rotary member. Also, the invention can be applied to the detection of failures other than the aforementioned sticking failure, as long as the output of the detection element of the rotation angle detection sensor changes from the normal state due to the failure.
  • One advantage of several embodiments of the invention is that a failure of the rotational angle detection sensor can be detected while the sensor is not moving, e.g., while the shift lever is not being moved.
  • Another possible advantage is as follows. Because the calculated value based on outputs from both of the first and second detection elements is compared with the predetermined value set in advance, and because the input-output characteristics of the first and second detection elements are linear with opposite inclinations, the calculated value will vary, depending on which detection element has failed, and the difference from the predetermined value will vary depending on which detection element has failed. Thus, a failure, such as sticking failure, of one of the first and second detection elements, can be readily detected and, in addition, the detection element which has failed can be easily identified. Therefore, the control of failure detection can be performed more accurately. Also, the failure, such as a sticking failure, can be detected while moving, e.g., a shift lever, from a present position (range) to the next position.
  • the absolute value of the difference between (1) the total of the outputs from the first and second detection elements and (2) the total of the outputs from the first and second detection sensors in normal operation is compared with a predetermined value set in advance.
  • the input-output characteristics of the first and second detection elements are linear with opposite inclinations. Therefore, the total value of the outputs from the first and second detection elements will differ depending on which detection element has failed and the difference as compared to the predetermined value, depending on which detection element has failed.
  • a failure such as a sticking failure
  • the control of detection of failure can be performed more accurately.
  • Another advantage is that, because the input-output characteristics of the first and second detection elements are linear with opposite inclinations and the absolute values for inclinations are equal to each other, the first and second predetermined values can be set equal to each other, and the failure detection control can be further simplified and made yet more accurate.
  • Another possible advantage is that a failure, such as a sticking failure of a position sensor which detects the position of a shift operation member (e.g., shift lever) for setting the range of the transmission, can be detected. Therefore, erroneous determination of the range selected for the transmission by the ECU can also be prevented.
  • a failure such as a sticking failure of a position sensor which detects the position of a shift operation member (e.g., shift lever) for setting the range of the transmission
  • the predetermined values may be set on the basis of the interval between adjacent ranges. Therefore, in a case when two ranges are set, a failure, such as a sticking failure of the position sensor, can be detected before the next adjacent range is determined. Thus, if the failure is detected before the next range is determined, some action for coping with the failure can be taken, e.g., fail-safe control prohibiting shift control of the transmission).
  • the predetermined value is set on the basis of the smallest angular spacing between adjacent range angular positions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US10/828,505 2003-04-23 2004-04-21 Failure detection device for a rotation angle detection sensor Abandoned US20050000268A1 (en)

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KR101122490B1 (ko) 2012-02-29
DE602004031685D1 (de) 2011-04-21
US7552615B2 (en) 2009-06-30
EP1471290B1 (en) 2011-03-09
EP1471290A2 (en) 2004-10-27
KR20040092393A (ko) 2004-11-03
US20060207310A1 (en) 2006-09-21
JP2004324720A (ja) 2004-11-18

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