WO2017130669A1 - 電磁負荷駆動装置、車載制御システム - Google Patents
電磁負荷駆動装置、車載制御システム Download PDFInfo
- Publication number
- WO2017130669A1 WO2017130669A1 PCT/JP2017/000364 JP2017000364W WO2017130669A1 WO 2017130669 A1 WO2017130669 A1 WO 2017130669A1 JP 2017000364 W JP2017000364 W JP 2017000364W WO 2017130669 A1 WO2017130669 A1 WO 2017130669A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- switch
- relay
- load
- voltage
- Prior art date
Links
Images
Classifications
-
- 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
- H02H3/20—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 responsive to excess voltage
- H02H3/22—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 responsive to excess voltage of short duration, e.g. lightning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
Definitions
- the present invention relates to technology for controlling an electromagnetic load.
- a switching element for example, a relay element
- Patent Document 1 aims at “in an inductive load driving device in which two switching elements are provided in series on a current-carrying path so that an on-fault of each switching element can be detected even during power-on control”.
- the duty driving transistor T10 is provided on the upstream side of the linear solenoid and the fail-safe transistor T20 is provided on the downstream side
- the duty driving transistor T10 is energized by turning off the fail-safe transistor T20 while continuing the duty driving at an arbitrary duty ratio. Zero (S260).
- the energization current does not become 0, it is determined that the fail-safe transistor T20 is on-failed (S300). Is disclosed (see summary).
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic load driving device capable of performing more fault diagnosis of relays.
- the electromagnetic load driving device cuts off the relay during a period in which the electromagnetic induction load is controlled, and performs diagnosis on the relay based on the surge voltage generated at that time.
- the electromagnetic load driving device it is possible to perform failure diagnosis on the relay while suppressing the influence on the driving accuracy of the electromagnetic induction load.
- FIG. 2 is a circuit configuration diagram of an ECU 11.
- FIG. 4 is a flowchart for explaining a procedure in which the ECU 11 performs a failure diagnosis of a current interruption relay 61. It is a time chart which shows the relationship between a target electric current and an actual current. It is a graph which illustrates the characteristic showing the correspondence between energization current 32 and interruption possible time. 4 is a timing chart illustrating a process in which the ECU 11 performs a failure diagnosis of the current interrupt relay 61.
- FIG. 5 is a circuit configuration diagram of an ECU 11 according to a second embodiment.
- 4 is a flowchart for explaining a procedure in which the ECU 11 performs a failure diagnosis of a power supply relay 22.
- 4 is a timing chart illustrating a process in which the ECU 11 performs a failure diagnosis of the current interrupt relay 61.
- 10 is a flowchart for explaining a procedure in which the ECU 11 according to the third embodiment performs a failure diagnosis of a current interrupt relay 61.
- 4 is a timing chart illustrating a process in which the ECU 11 performs a failure diagnosis of the current interrupt relay 61.
- 7 is a flowchart for explaining a procedure in which the ECU 11 according to the fourth embodiment performs failure diagnosis of a current interruption relay 61.
- FIG. 10 is a circuit configuration diagram of an ECU 11 according to a sixth embodiment.
- FIG. 10 is a circuit configuration diagram of an ECU 11 according to a seventh embodiment.
- 4 is a timing chart illustrating a process in which the ECU 11 performs a failure diagnosis of the current interrupt relay 61.
- 10 is a timing chart illustrating a process in which the ECU 11 according to the eighth embodiment performs a failure diagnosis of the current interrupt relay 61.
- FIG. 1 is a diagram schematically showing a configuration of an automatic transmission of a vehicle equipped with an ECU 11 (electronic control transmission) according to Embodiment 1 of the present invention.
- the rotational output output from the engine 1 is input to the transmission 2.
- the transmission 2 decelerates the rotation output and outputs it to the drive wheels 3.
- the hydraulic circuit 5 controls the gear ratio of the transmission 2.
- the hydraulic pump 4 generates hydraulic pressure for operating the hydraulic circuit 5.
- An electromagnetic induction load (solenoid) 14 switches the hydraulic circuit 5.
- the ECU (Electronic Control Unit) 11 outputs a load current 33 for driving the electromagnetic induction load 14.
- FIG. 2 is a circuit configuration diagram of the ECU 11.
- the ECU 11 includes a microcomputer 21, a power supply relay 22, a voltage detection unit 23, a load drive circuit 25, a capacitor 24, and a cutoff circuit 60.
- the power relay 22 is connected to the downstream side of the in-vehicle battery 13.
- the voltage smoothing capacitor 24 and the load driving circuit 25 are connected to each other on the downstream side of the power supply relay 22 in parallel.
- the voltage detection unit 23 is connected to each of the upstream side and the downstream side of the power relay 22, monitors the upstream voltage and the downstream voltage of the power relay 22, and outputs the monitoring result to the microcomputer 21.
- the monitoring results input to the microcomputer 21 are an upstream voltage 42 and a downstream voltage 43, respectively.
- a switch 12 is connected to the downstream side of the in-vehicle battery 13 and is turned on and off when the ECU 11 is started and stopped.
- the power supply relay 22 is driven by a relay drive signal 37 and supplies or cuts off a power supply voltage (voltage supplied by the vehicle-mounted battery 13) to a circuit disposed on the downstream side of the power supply relay 22.
- a power supply voltage voltage supplied by the vehicle-mounted battery 13
- the power relay 22 is on (energized)
- the upstream voltage 42 and the downstream voltage 43 of the power relay 22 are equivalent.
- the power supply relay 22 is off (shut off)
- the upstream voltage 42 and the downstream voltage 43 of the power supply relay 22 are different from each other.
- the load drive circuit 25 is a circuit that controls the drive voltage for driving the electromagnetic induction load 14 and the energization current 32 that flows through the electromagnetic induction load 14.
- the load drive circuit 25 includes a drive IC (Integrated Circuit) 26, a freewheeling diode 27, a current detection resistor 28, and a current detection unit 29.
- the drive IC 26 controls the switching element according to the drive signal 36 (for example, Pulse Width Modulation control) to control the waveform of the energization current 32 and outputs the controlled energization current 32 to the electromagnetic induction load 14.
- the current detection unit 29 detects the actual load current 33 using the current detection resistor 28 and outputs the result as an actual current signal 38 to the microcomputer 21.
- the microcomputer 21 calculates the difference between the target current and the actual current signal 38 received from the current detection unit 29, determines the duty of the drive signal 36 that operates the drive IC 26 based on the difference, and operates the drive IC 26. .
- the duty of the drive signal 36 is high, the energizing current 32 becomes large, and when the duty is low, the energizing current 32 becomes small.
- the load current 33 includes an energization current 32 output from the drive IC 26 and a return current 35 output from the return diode 27.
- the energization current 32 flows only while the drive IC 26 is operating, and does not flow during non-operation.
- the return current 35 flows only during a non-operation period after the drive IC 26 changes from the operation state to the non-operation state.
- the interruption circuit 60 includes a current interruption relay 61 and a voltage detection unit 62.
- the current interruption relay 61 is a switching element for interrupting the energization current 32 of the electromagnetic induction load 14.
- the voltage detector 62 monitors the upstream voltage 64 of the current interrupt relay 61.
- the current interruption relay 61 is controlled by a current interruption signal 63.
- the upstream voltage 64 is equivalent to the ground.
- a counter electromotive voltage (surge voltage) is generated upstream of the current interruption relay 61 and the upstream voltage 64 Becomes a voltage equal to or higher than the power supply voltage.
- a voltage limiting element 65 for limiting the counter electromotive voltage is connected in parallel with the current interruption relay 61.
- the voltage limiting element 65 may be either built in the current cutoff relay 61 or independent from the current cutoff relay 61.
- the voltage limiting element 65 prevents an excessive voltage from being applied to the current interruption relay 61.
- FIG. 3 is a flowchart illustrating a procedure in which the ECU 11 performs a failure diagnosis of the current interruption relay 61. Hereinafter, each step of FIG. 3 will be described.
- Step S100 After starting up, the microcomputer 21 performs self-failure diagnosis on the microcomputer 21 itself and its peripheral circuits, and after confirming that the ECU 11 can control the load correctly, shifts to the normal control mode. During normal control, the load current 33 is controlled by repeatedly executing this flowchart based on various information input to the microcomputer 21.
- Step S110 The microcomputer 21 determines whether the relay diagnosis flag is on. If the relay diagnosis flag is on, steps S120 to S170 are executed. If the relay diagnosis flag is off, steps S210 to S270 are executed. Steps S210 to S270 are preprocessing performed before relay failure diagnosis. Steps S120 to S170 are failure diagnosis processing. Hereinafter, steps S210 to S270 will be described first for convenience of description.
- the microcomputer 21 measures the load current 33 (S210).
- the microcomputer 21 calculates the possible interruption time of the current interruption relay 61 (S220).
- the interruption possible time of the current interruption relay 61 is a time during which the fluctuation of the energization current 32 flowing through the electromagnetic induction load 14 can be kept within an allowable range while the electric current interruption relay 61 is being interrupted. Specific examples will be described with reference to FIGS.
- Step S230 The microcomputer 21 sets the time for actually cutting off the current cutoff relay 61 (relay cutoff time) based on the cutoff possible time calculated in step S220.
- the relay cut-off time is shorter than the cut-off possible time. This is because if the relay cut-off time is longer than the cut-off possible time, the energized current 32 deviates greatly from the target current, and the control accuracy for driving the electromagnetic induction load 14 is lowered due to insufficient energized current.
- the microcomputer 21 acquires the upper and lower limit threshold values used when performing the failure diagnosis of the current interrupt relay 61. Specifically, the range in which the upstream voltage 64 rises due to the back electromotive voltage when the current interrupting relay 61 is interrupted is previously grasped according to the electrical characteristics of the voltage limiting element 65, and is increased before and after considering circuit variation. Set the lower threshold. For example, when the upstream voltage 64 is assumed to be in the range of 26V to 28V including circuit variations, the upper limit threshold is 28V and the power lower limit threshold is 26V.
- Step S240 Supplement
- the upper and lower thresholds determined in this step can be fixedly determined in advance.
- the rising range may vary depending on the temperature characteristics of the element. In that case, the temperature characteristic is described in advance in a data table or the like, and the rising range of the upstream voltage 64 can be calculated by collating the temperature acquired from a separately provided temperature sensor with the temperature characteristic.
- Steps S250 to S270 The microcomputer 21 sets the relay diagnosis flag to ON (S250).
- the microcomputer 21 turns off (cuts off) the current cutoff relay 61 (S260).
- the microcomputer 21 starts a cut-off time timer used for measuring the time during which the current cut-off relay 61 is cut off (S270).
- Step S120 The microcomputer 21 determines whether or not the relay cut-off time set in step S230 has elapsed between the time when the current cut-off relay 61 is cut off and the current time. The elapsed time is measured by the cutoff time timer started in step S270. If the relay cut-off time has not elapsed, this flowchart is ended (the failure diagnosis of the current cut-off relay 61 is not performed). If the relay cut-off time has elapsed, the process proceeds to step S130.
- Step S130 to S140 The microcomputer 21 measures the upstream voltage 64 (S130). The microcomputer 21 determines whether or not the upstream voltage 64 is between the upper threshold value and the lower threshold value set in step S240 (S140). If the upstream voltage 64 is between the upper limit threshold and the lower limit threshold (the current interrupt relay 61 is normal), the process proceeds to step S160. If the upstream voltage 64 is not between the upper limit threshold and the lower limit threshold (the current interrupt relay 61 is abnormal), the process proceeds to step S150.
- Steps S150 to S160 When the microcomputer 21 determines that the current interrupting relay 61 is abnormal, it sets the relay failure flag to ON (S150), and when it determines that the current interrupting relay 61 is normal, it turns off the relay diagnosis flag. The shut-off time timer is reset (S160).
- Step S170 The microcomputer 21 turns on the current interruption relay 61 and ends the flowchart of FIG.
- FIG. 4 is a time chart showing the relationship between the target current and the actual current.
- the energization current 32 flowing through the electromagnetic induction load 14 is controlled by the drive IC 26 so as to coincide with the target current.
- the microcomputer 21 supplies the energization current 32 via the drive IC 26 so that the difference is within the allowable range and the difference converges to zero. Control. Variations caused by turning off the current interruption relay 61 should be within this allowable range.
- the cutoff possible time calculated in step S220 is set based on this.
- FIG. 5 is a graph illustrating characteristics representing the correspondence between the energization current 32 and the cutoff possible time.
- the microcomputer 21 stores data describing the correspondence as shown in FIG. 5 in, for example, the storage device 21a provided internally, and calculates the breakable time of the current breaker relay 61 according to the data. For example, when the energization current 32 is 1.0 A, the cutoff possible time is a time corresponding to 0.1% of the duty of the drive signal 36.
- the characteristics shown in FIG. 5 can be determined in consideration of variations and deterioration of internal elements / loads of the ECU 11 or experimental data.
- FIG. 6 is a timing chart for explaining a process in which the ECU 11 performs a failure diagnosis of the current interruption relay 61.
- time t100 to t120 one cycle of the drive signal of the load drive circuit 25 is shown.
- time t110 to t120 is a period during which the drive signal 36 is turned on, and the energizing current 32 flows through the electromagnetic induction load 14.
- Time t110 to t120 is a period in which the drive signal 36 is off, and the return current 35 flows through the electromagnetic induction load 14.
- the microcomputer 21 executes steps S210 to S250 between times t200 and t210.
- the microcomputer 21 turns off the current interruption relay 61.
- time t310 to t320 is the relay cut-off time, and the upstream voltage 64 increases.
- the microcomputer 21 executes failure diagnosis of the current interrupt relay 61 at time t320.
- the ECU 11 cuts off the current cut-off relay 61 within a range in which the fluctuation of the control accuracy of the energized current 32 can be allowed even during the normal control period in which the electromagnetic induction load 14 is being driven. Thereby, the influence which it has on the precision of drive control with interruption
- FIG. 7 is a circuit configuration diagram of the ECU 11 according to the second embodiment of the present invention.
- the ECU 11 includes two load drive circuits 25.
- subscripts “a” and “b” are given to the load driving circuit 25 and its components in FIG. Hereinafter, these subscripts are used to distinguish them. Since other configurations are the same as those of the first embodiment, differences will be mainly described below.
- FIG. 8 is a flowchart illustrating a procedure in which the ECU 11 performs a failure diagnosis of the power supply relay 22. Compared with FIG. 3, step S200 is newly added. The other steps are the same as in FIG.
- Step S200 The microcomputer 21 identifies the load drive circuit 25 that is operating in order to check whether the processing after S210 is performed for the energized current 32 in the state in which the load drive circuit 25 is operating.
- Step S200 Supplement
- the energization current 32 is measured without confirming which load driving circuit 25 is operating.
- step S220 there is a possibility that the breakable time is calculated using a current value different from the actually flowing current. In this case, there is a possibility that a failure of the current interruption relay 61 is erroneously detected or a failure of the current interruption relay 61 is missed. Therefore, in the second embodiment, this step is provided in order to calculate the correct breakable time according to the energization current 32 that is actually flowing.
- FIG. 9 is a timing chart for explaining a process in which the ECU 11 performs a failure diagnosis of the current interruption relay 61. From time t100 to t200 is the same as in the first embodiment. Between times t200 and t210, the microcomputer 21 identifies the load drive circuit 25 in operation, monitors the load current of each load drive circuit, calculates the total load current 33, and sets the upper and lower thresholds of the upstream voltage 64. set. The time from time t310 to t320 is the relay cutoff time set in step S230. The microcomputer 21 executes failure diagnosis of the current interruption relay 61 at time t320.
- the ECU 11 according to the second embodiment does not affect the accuracy of drive control of the electromagnetic induction load 14 even when a plurality of load drive circuits 25 are operated, and interrupts the current as in the first embodiment. A failure diagnosis of the relay 61 can be performed.
- the configuration in which the ECU 11 includes the two load driving circuits 25 is shown, but the same effect can be obtained even when the load driving circuit 25 is provided with three or more.
- the failure diagnosis method for the current interrupt relay 61 in a state in which the plurality of load drive circuits 25 are operating has been described.
- the ECU 11 includes the plurality of load drive circuits 25, one of which is the load drive circuit.
- the failure diagnosis of the current interruption relay 61 can also be performed in a state in which 25 is operating.
- FIG. 10 is a flowchart illustrating a procedure in which the ECU 11 according to the third embodiment of the present invention performs a failure diagnosis of the current interrupt relay 61. Compared with FIG. 3, step S101 is newly added. The other steps are the same as in FIG. The configuration of the ECU 11 is the same as that of the first embodiment.
- Step S101 The microcomputer 21 determines whether or not the target value of the load current 33 is constant and whether or not the load current 33 is settling. When the target current value is constant and the load current 33 is set, the process proceeds to step S110. When the target current value is not constant or when the load current 33 is not settled, the process skips to step S160. That is, failure diagnosis of the power supply relay 22 is interrupted in a state where the target current value is not constant or a transient state where the load current 33 is not settled.
- the target value of the load current 33 may be changed during operation.
- the microcomputer 21 controls the load current 33 toward the changed target value. If failure diagnosis of the current interrupting relay 61 is performed in a period in which the load current 33 has not settled immediately after the target current value has changed, the following problems may occur.
- the actual load current 33 is smaller than the values used when calculating the relay cutoff time and the upper and lower limit thresholds in steps S210 to S240, the actual increase in the upstream voltage 64 is the upstream voltage 64 considered in step S240. Therefore, it is erroneously detected that the current interrupting relay 61 is out of order.
- step S101 it is possible to avoid erroneous detection of a failure and a decrease in control accuracy.
- Step S101 Supplement 2
- Whether or not the load current 33 is set can be determined based on, for example, whether or not the load current 33 converges within a range of 95% to 105% with respect to the target current. It may be determined according to other appropriate rules.
- FIG. 11 is a timing chart for explaining a process in which the ECU 11 performs failure diagnosis of the current interruption relay 61.
- the load current 33 and the drive signal 36 are a sawtooth wave and a rectangular wave, respectively, but are schematically shown as straight lines in FIG.
- the microcomputer 21 turns off the current interruption relay 61 at time t310 and starts failure diagnosis. It is assumed that the target current value is switched from the target value a to the target value b at time t311. From time t311 to t400, the target current value changes and the load current 33 is not settled. During this period, the microcomputer 21 interrupts the failure diagnosis of the current interruption relay 61.
- the microcomputer 21 can perform a failure diagnosis of the current interruption relay 61.
- the microcomputer 21 executes steps S210 to S240 from time t200 to t210 as in FIG. From time t310 to t320, the microcomputer 21 turns off the current interruption relay 61 as in FIG.
- the ECU 11 according to the third embodiment interrupts the failure diagnosis of the current interruption relay 61 during the period in which the load current 33 changes transiently. As a result, it is possible to avoid erroneous detection of failure and a decrease in accuracy of drive control of the electromagnetic induction load 14.
- the configuration and operation according to the third embodiment can be applied to the second embodiment, for example.
- FIG. 12 is a flowchart illustrating a procedure in which the ECU 11 according to the fourth embodiment of the present invention performs failure diagnosis of the current interrupt relay 61. Compared with FIG. 3, step S201 is newly added. The other steps are the same as in FIG. The configuration of the ECU 11 is the same as that of the first embodiment.
- Step S201 The microcomputer 21 confirms whether or not the duty of the drive signal 36 is such that the accuracy of the drive control of the electromagnetic induction load 14 is not affected even if the current cut-off relay 61 is cut off. That is, it is determined whether or not the duty of the drive signal 36 is between the duty upper limit value and the duty lower limit value. When the duty of the drive signal 36 is not between the duty upper limit value and the duty lower limit value, this flowchart is ended. When the duty of the drive signal 36 is between the duty upper limit value and the duty lower limit value, the process proceeds to step S210. By adding step S201, it is possible to avoid failure oversight and a decrease in accuracy of load drive control described below.
- Step S201 Supplement 1
- the upstream voltage 64 does not rise sufficiently even if the current cutoff relay 61 is turned off. Therefore, it cannot be correctly determined whether or not the upstream voltage 64 does not sufficiently increase due to the short circuit failure of the current interruption relay 61. That is, even if the current interrupting relay 61 is short-circuited, it cannot be correctly determined whether or not a failure has occurred, and the failure may be missed.
- Step S201 Supplement 2
- the energization current 32 is sufficiently large, that is, when the duty of the drive signal 36 is high, the breakable time of the current break relay 61 is extremely shortened (see FIG. 5).
- the current interruption signal 63 includes a certain delay. Even if the current interruption signal 63 is set to the interruption state within the delay time, the state of the current interruption relay 61 does not change. That is, if the breakable time is extremely short, the current cutout relay 61 cannot be cut off as expected, and the upstream voltage 64 may not rise sufficiently. In this case, even if the current interruption relay 61 is normal, it is erroneously diagnosed as a failure.
- FIG. 13 is a timing chart for explaining a process in which the ECU 11 performs a failure diagnosis of the current interruption relay 61.
- the load current 33 and the drive signal 36 are a sawtooth wave and a rectangular wave, respectively, but are schematically shown as straight lines in FIG.
- the drive signal 36 Prior to time t500, the drive signal 36 is less than or equal to the lower limit of the duty, and the microcomputer 21 does not perform failure diagnosis of the current interrupt relay 61 during this period. After time t510, the drive signal 36 is equal to or greater than the duty upper limit value, and the microcomputer 21 does not perform failure diagnosis of the current interrupt relay 61 during this period. During the period from time t500 to t510, the duty of the drive signal 36 is between the duty upper limit value and the duty lower limit value, and the microcomputer 21 performs failure diagnosis of the current interrupt relay 61 during this period.
- FIG. 14 is a flowchart illustrating a procedure in which the ECU 11 according to the fifth embodiment of the present invention performs failure diagnosis of the current interrupt relay 61. Compared with FIG. 3, step S120 to step S140b, and step S230 and step S240 are changed. The configuration of the ECU 11 is the same as that of the first embodiment.
- the microcomputer 21 sets the relay cutoff time a and the relay cutoff time b.
- the relay cut-off time a is set to a time shorter than the relay cut-off time b.
- the relay cut-off time b is a time for actually cutting off the current cut-off relay 61 (similar to the relay cut-off time in the first embodiment).
- the microcomputer 21 calculates the increased voltage a of the upstream voltage 64a based on the relay cutoff time a. Further, the rising voltage component b of the upstream voltage 64b is calculated based on the relay cutoff time b.
- the microcomputer 21 further sets upper limit threshold values a and b and lower limit threshold values a and b corresponding to the increased voltage components a and b, respectively.
- the upper and lower thresholds a and b may be the same, or a part of the range may overlap. The distinction between the downstream voltages 64a and 64b will be described later.
- Step S120 The microcomputer 21 determines whether or not the relay cut-off time a has elapsed since the current cut-off relay 61 is turned off. If the relay cut-off time “a” has not been exceeded, this flowchart is terminated, and the diagnosis process for the current cut-off relay 61 after step S130a is not performed. If the relay cut-off time a is exceeded, the process proceeds to step S130a.
- Step S130a The microcomputer 21 determines whether or not the upstream voltage 64a has been measured. If not measured, the upstream voltage 64a is measured. In this flowchart, since the upstream voltage 64 is measured twice, the subscripts a and b are used to distinguish them.
- Step S130b The microcomputer 21 determines whether or not the relay cut-off time b has elapsed since the current cut-off relay 61 is turned off. If the relay cut-off time b has not been exceeded, this flowchart is terminated, and the diagnosis process for the current cut-off relay 61 after step S131b is not performed. If the relay cut-off time b is exceeded, the process proceeds to step S131b.
- Step S130b The microcomputer 21 measures the upstream voltage 64b.
- Steps S140a to S140b The microcomputer 21 determines whether the upstream voltage 64a is between the upper threshold value a and the lower threshold value a (S140a). The microcomputer 21 determines whether the upstream voltage 64b is between the upper threshold value b and the lower threshold value b. Is determined (S140b). If any of the determination conditions of step S140a and step S140b is not satisfied, the process proceeds to step S150. If both the determination conditions of step S140a and step S140b are satisfied, the process proceeds to step S160.
- Step S160 In addition to resetting the relay diagnosis flag and the timer, the microcomputer 21 resets the upstream voltages 64a and 64b.
- FIG. 15 is a timing chart for explaining a process in which the ECU 11 performs a failure diagnosis of the current interruption relay 61.
- the current interruption relay 61 is turned off during the period from time t310 to t320.
- Time t310 corresponds to the relay cut-off time a
- time t320 corresponds to the relay cut-off time b.
- the microcomputer 21 measures the upstream voltage 64a.
- the microcomputer 21 measures the upstream voltage 64b.
- the microcomputer 21 determines whether or not the upstream voltage 64 at each of the times t311 and t320 is between the upper and lower thresholds a and b.
- the upstream voltage 64 of the current interruption relay 61 fluctuates and falls within the upper and lower limit threshold range. May enter. Then, although the current interruption relay 61 is short-circuited, the microcomputer 21 makes a false diagnosis that the current interruption relay 61 is normal. On the other hand, the ECU 11 according to the fifth embodiment monitors the upstream voltage 64 of the current interruption relay 61 a plurality of times even when the current interruption relay 61 is short-circuited, and is out of the upper / lower limit threshold range even once. If this is detected, it is determined that a failure has occurred.
- the configuration and operation according to the sixth embodiment can be applied to the second embodiment, for example. Even if a plurality of relay cutoff times a in the sixth embodiment are set, the same effect can be obtained.
- FIG. 16 is a circuit configuration diagram of the ECU 11 according to the sixth embodiment of the present invention.
- the current detection unit 29 is configured as a part of the drive IC 26.
- the process of controlling the load current 33 is performed by the current control unit 51 provided in the drive IC 26.
- the same effect as in the first embodiment can be obtained.
- the same effect can be acquired also when providing the some load drive circuit 25 like Embodiment 2.
- FIG. 16 is a circuit configuration diagram of the ECU 11 according to the sixth embodiment of the present invention.
- the current detection unit 29 is configured as a part of the drive IC 26.
- the process of controlling the load current 33 is performed by the current control unit 51 provided in the drive IC 26.
- the same effect as in the first embodiment can be obtained.
- the same effect can be acquired also when providing the some load drive circuit 25 like Embodiment 2.
- FIG. 17 is a circuit configuration diagram of the ECU 11 according to the seventh embodiment of the present invention.
- the ECU 11 according to the seventh embodiment has a configuration in which the position of the load driving circuit 25 and the position of the cutoff circuit 60 in the first embodiment are interchanged. That is, the load drive circuit 25 is disposed on the downstream side of the electromagnetic induction load 14, and the cutoff circuit 60 is disposed on the upstream side of the electromagnetic induction load 14.
- the points different from the first embodiment with this replacement will be described.
- the load current 33 reaches the load drive circuit 25 from the downstream side of the electromagnetic induction load 14 and flows toward the ground via the drive IC 26.
- the current detection unit 29 detects a current input to the drive IC 26.
- the current interruption relay 61 interrupts the conduction current 32 on the upstream side of the electromagnetic induction load 14.
- a counter electromotive voltage (surge voltage) is generated downstream of the current interruption relay 61 so that the load current continues to flow, and the downstream voltage 64 becomes a voltage equivalent to or lower than ground. Therefore, the upper and lower threshold values set in step S240 must be determined according to the voltage characteristics at that time.
- the voltage detector 62 monitors the downstream voltage 64 of the current interruption relay 61 and outputs the monitoring result to the microcomputer 21.
- FIG. 18 is a timing chart for explaining a process in which the ECU 11 performs a failure diagnosis of the current interruption relay 61.
- the diagnostic procedure is generally the same as in the first embodiment. However, unlike the first embodiment, while the current interruption relay 61 is interrupted, the downstream voltage 64 decreases to the ground equivalent or less, so the upper and lower thresholds are set before and after that.
- FIG. 19 is a timing chart illustrating a process in which the ECU 11 according to the eighth embodiment performs a failure diagnosis of the current interrupt relay 61. For convenience of description, only a part of each signal waveform described in the first embodiment is extracted.
- the upstream voltage 64 rises rapidly.
- the microcomputer 21 detects the rising edge, it confirms whether the upstream voltage 64 is equal to or lower than the upper limit threshold value. Thereafter, when the current interruption relay 61 is turned on, the upstream voltage 64 falls rapidly.
- the microcomputer 21 detects the falling edge, it confirms whether the upstream voltage 64 is equal to or higher than the lower limit threshold value. It can be diagnosed that the current interruption relay 61 is normal when the upstream voltage 64 is within the threshold range at any edge, and is abnormal when it is not at least at any edge.
- step S140 In order to carry out the above diagnostic procedure, (a) a step of detecting the rising edge of the upstream voltage 64 and acquiring the upstream voltage 64 instead of steps S120 to S130 described in FIG. 3; (b) an upstream voltage 64; The step of detecting the falling edge and acquiring the upstream voltage 64 may be performed, and then step S140 and subsequent steps may be performed.
- the microcomputer 21 diagnoses the current interruption relay 61 based on whether or not the upstream voltage 64 is within the range of the upper and lower thresholds during the period when the current interruption relay 61 is interrupted. Therefore, when the time when the rising edge is detected is outside the period during which the current interrupting relay 61 is interrupted, the flowchart of FIG. The abnormality diagnosis in this case is performed by a procedure different from that in FIG.
- the flowchart of FIG. Carry out diagnosis by another procedure.
- the microcomputer 21 can check this by checking whether the time interval between the time t320 and the falling edge is within a predetermined range.
- the present invention is not limited to the above-described embodiments, and includes various modifications.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment.
- the detection units such as the voltage detection unit 23, the current detection unit 29, and the voltage detection unit 62 can be mounted using hardware such as a circuit device that realizes these functions. It is only necessary that the same function can be implemented.
- the microcomputer 21 diagnoses the current interruption relay 61 using the detection result of the voltage detection unit 62.
- the rising edge and the falling edge are detected.
- the microcomputer 21 has the same function implemented by hardware, the function can be used.
- a similar function may be implemented by software processing, or edge detection may be implemented by other appropriate circuit devices.
- ECU ECU
- 14 electromagnetic induction load
- 21 microcomputer
- 22 power supply relay
- 23 voltage detector
- 24 capacitor
- 25 load drive circuit
- 27 freewheeling diode
- 32 energizing current
- 33 load current
- 35 reflux current
- 61 current interrupting relay
- 62 voltage detection unit
- 65 voltage limiting element.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Electronic Switches (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
図1は、本発明の実施形態1に係るECU11(電子制御変速装置)を搭載した車両の自動変速機の構成を模式的に示す図である。エンジン1から出力された回転出力は変速機2に対して入力される。変速機2はその回転出力を減速し、駆動輪3に対して出力する。油圧回路5は、変速機2の変速比を制御する。油圧ポンプ4は、油圧回路5が動作するための油圧を生成する。電磁誘導負荷(ソレノイド)14は、油圧回路5を切り替える。ECU(Electronic Control Unit)11は、電磁誘導負荷14を駆動するための負荷電流33を出力する。
図3は、ECU11が電流遮断リレー61の故障診断を実施する手順を説明するフローチャートである。以下図3の各ステップについて説明する。
マイコン21は起動後、マイコン21自身やその周辺回路に対する自己故障診断を実施し、ECU11が負荷を正しく制御できる状態であることを確認した上で、通常制御モードへ移行する。通常制御中は、マイコン21に対して入力される各種情報に基づき本フローチャートを繰り返し実行することにより、負荷電流33を制御する。
マイコン21は、リレー診断フラグがオンであるか否かを判断する。リレー診断フラグがオンである場合は、ステップS120~S170を実行する。リレー診断フラグがオフである場合は、ステップS210~S270を実行する。ステップS210~S270は、リレー故障診断の前に実施する前処理である。ステップS120~S170は、故障診断処理である。以下では説明の都合上、ステップS210~S270を先に説明する。
マイコン21は、負荷電流33を計測する(S210)。マイコン21は、電流遮断リレー61の遮断可能時間を算出する(S220)。電流遮断リレー61の遮断可能時間とは、電流遮断リレー61を遮断している間において電磁誘導負荷14に流れる通電電流32の変動を、許容範囲以内に収めることができる時間である。具体例については後述の図4~図5で説明する。
マイコン21は、ステップS220において算出した遮断可能時間に基づき、電流遮断リレー61を実際に遮断する時間(リレー遮断時間)をセットする。リレー遮断時間は、遮断可能時間よりも短い時間とする。リレー遮断時間が遮断可能時間よりも長いと、通電電流32が目標電流に対して大きく逸脱し、通電電流不足により電磁誘導負荷14を駆動する制御精度が低下するからである。
マイコン21は、電流遮断リレー61の故障診断を実施する際に用いる上下限閾値を取得する。具体的には、電流遮断リレー61を遮断したとき逆起電圧によって上流電圧64が上昇する範囲を電圧制限素子65の電気特性にしたがってあらかじめ把握しておき、回路バラツキを考慮してその前後に上下限閾値をセットする。例えば、回路バラツキを含めて上流電圧64が26V~28Vの範囲になると想定される場合、上限閾値は28V、電下限閾値は26Vとなる。
逆起電圧による上流電圧64の上昇範囲は、電圧制限素子65の電気特性によってほぼ支配的に定まるので、本ステップにおいて定める上下限閾値はあらかじめ固定的に定めることができる。ただし素子の温度特性によってその上昇範囲が変動する場合がある。その場合はその温度特性をデータテーブルなどにあらかじめ記述しておき、別途設けた温度センサから取得した温度とその温度特性を照合することにより、上流電圧64の上昇範囲を算出することができる。
マイコン21は、リレー診断フラグをONにセットする(S250)。マイコン21は電流遮断リレー61をオフ(遮断)する(S260)。マイコン21は、電流遮断リレー61が遮断されている時間を計測するために用いる遮断時間タイマを開始する(S270)。
マイコン21は、電流遮断リレー61を遮断してから現時刻までの間に、ステップS230で設定したリレー遮断時間が経過したか否かを判断する。経過時間は、ステップS270において開始した遮断時間タイマにより計測する。リレー遮断時間を経過していない場合は、本フローチャートを終了する(電流遮断リレー61の故障診断は実施しない)。リレー遮断時間が経過している場合、ステップS130へ進む。
マイコン21は、上流電圧64を計測する(S130)。マイコン21は、上流電圧64がステップS240でセットした上限閾値と下限閾値の間にあるか否かを判断する(S140)。上流電圧64が上限閾値と下限閾値の間にある(電流遮断リレー61が正常である)場合は、ステップS160へ進む。上流電圧64が上限閾値と下限閾値の間にない(電流遮断リレー61が異常である)場合は、ステップS150へ進む。
マイコン21は、電流遮断リレー61が異常であると判断した場合はリレー故障フラグをオンにセットし(S150)、電流遮断リレー61が正常であると判断した場合はリレー診断フラグをオフした上で遮断時間タイマをリセットする(S160)。
マイコン21は、電流遮断リレー61をオンし、図3のフローチャートを終了する。
本実施形態1に係るECU11は、電磁誘導負荷14を駆動している通常制御期間においても、通電電流32の制御精度の変動を許容できる範囲内において電流遮断リレー61を遮断する。これにより、遮断にともなって駆動制御の精度に対して与える影響を抑えることができる。したがって、電流遮断リレー61の故障を検知する頻度を向上させることができる。
図7は、本発明の実施形態2に係るECU11の回路構成図である。本実施形態2において、ECU11は負荷駆動回路25を2つ備える。これらを区別するため、図7において負荷駆動回路25およびその構成要素に対して、添え字「a」「b」をそれぞれ付与した。以下この添え字を用いてこれらを区別する。その他の構成は実施形態1と同様であるため、以下では主に差異点について説明する。
図8は、ECU11が電源リレー22の故障診断を実施する手順を説明するフローチャートである。図3と比較すると、ステップS200が新たに追加されている。その他のステップは図3と同様である。
マイコン21は、いずれの負荷駆動回路25を動作させている状態における通電電流32についてS210以降の処理を実施するのかを確認するため、動作している負荷駆動回路25を識別する。
本ステップを実施しない場合、いずれの負荷駆動回路25が動作しているか確認しないまま通電電流32を計測することになる。そうするとステップS220において、実際に流れている電流とは異なる電流値を用いて遮断可能時間を算出する可能性がある。この場合、電流遮断リレー61の故障を誤検知し、または電流遮断リレー61の故障を見逃してしまう可能性がある。そこで本実施形態2においては、実際に流れている通電電流32にしたがって正しい遮断可能時間を算出するため、本ステップを設けることとした。
本実施形態2に係るECU11は、複数の負荷駆動回路25を動作させている場合であっても、電磁誘導負荷14の駆動制御の精度に影響を与えることなく、実施形態1と同様に電流遮断リレー61の故障診断を実施することができる。
図10は、本発明の実施形態3に係るECU11が電流遮断リレー61の故障診断を実施する手順を説明するフローチャートである。図3と比較すると、ステップS101が新たに追加されている。その他のステップは図3と同様である。ECU11の構成は実施形態1と同様である。
マイコン21は、負荷電流33の目標値が一定であるか否か、および負荷電流33が整定しているか否かを判断する。目標電流値が一定であり、かつ、負荷電流33が整定している場合、ステップS110へ進む。目標電流値が一定でない場合、または、負荷電流33が整定していない場合は、ステップS160へスキップする。すなわち、目標電流値が一定ではない状態や負荷電流33が整定していない過渡状態においては、電源リレー22の故障診断を中断する。
負荷電流33の目標値は、動作中に変更される場合がある。目標値が変更されると、マイコン21は負荷電流33をその変更後の目標値に向かって制御する。目標電流値が変化した直後から負荷電流33が整定していない期間において、電流遮断リレー61の故障診断を実施すると、以下の不具合が生じる可能性がある。ステップS210からS240においてリレー遮断時間と上下限閾値を算出する際に用いた値と比較して実際の負荷電流33が少ない場合、上流電圧64の実際の上昇分はステップS240において考慮した上流電圧64の上昇分よりも少なくなり、電流遮断リレー61が故障していると誤検知することになる。一方で実際の負荷電流33が多い場合、通電電流32の制御精度についての許容範囲内で電流遮断リレー61を遮断したとしても、制御精度がその許容範囲内に収まらない可能性がある。ステップS101により、故障の誤検知や制御精度の低下を回避することが可能となる。
負荷電流33が整定しているか否かは、例えば、目標電流に対して負荷電流33が95%から105%の範囲内に収束しているか否か、などに基づき判断することができる。その他適当なルールにしたがって判断してもよい。
本実施形態3に係るECU11は、負荷電流33が過渡的に変化している期間においては電流遮断リレー61の故障診断を中断する。これにより、故障の誤検知や電磁誘導負荷14の駆動制御の精度低下を避けることができる。本実施形態3に係る構成および動作は例えば実施形態2に対して適用することもできる。
図12は、本発明の実施形態4に係るECU11が電流遮断リレー61の故障診断を実施する手順を説明するフローチャートである。図3と比較すると、ステップS201が新たに追加されている。その他のステップは図3と同様である。ECU11の構成は実施形態1と同様である。
マイコン21は、駆動信号36のデューティが、電流遮断リレー61を遮断しても電磁誘導負荷14の駆動制御の精度に対して影響が生じない程度であるか否かを確認する。すなわち、駆動信号36のデューティがデューティ上限値とデューティ下限値の間にあるか否かを判断する。駆動信号36のデューティがデューティ上限値とデューティ下限値の間にない場合、本フローチャートを終了する。駆動信号36のデューティがデューティ上限値とデューティ下限値の間にある場合、ステップS210へ進む。ステップS201を追加することにより、以下に説明する故障見逃しや負荷駆動制御の精度低下を回避することができる。
通電電流32が十分に小さい場合、つまり駆動信号36のデューティが低い場合、電流遮断リレー61をオフさせたとしても、上流電圧64は充分に上昇しない。そのため、電流遮断リレー61がショート故障していることにより上流電圧64が充分に上昇しないのか否かを、正しく判断することができない。つまり、電流遮断リレー61がショート故障していたとしても、故障が生じているのか否かを正しく判断することができず、故障を見逃す可能性がある。
通電電流32が十分に大きい場合、すなわち駆動信号36のデューティが高い場合、電流遮断リレー61の遮断可能時間が極端に短くなる(図5参照)。他方、電流遮断リレー61の通電と遮断は電流遮断信号63によって制御されるが、電流遮断信号63はある程度の遅れを含んでいる。遅れ時間以内で電流遮断信号63を遮断状態にセットしたとしても、電流遮断リレー61の状態は変化しない。つまり、遮断可能時間が極端に短い場合、電流遮断リレー61を想定通り遮断することができず、上流電圧64が充分に上昇しない可能性がある。この場合、電流遮断リレー61が正常であっても、故障であると誤診断してしまう。
本実施形態4に係るECU11によれば、(a)通電電流32が十分に小さい場合に電流遮断リレー61の故障を見逃す可能性を抑制するとともに、(b)通電電流32が十分に大きい場合に電流遮断リレー61の故障を誤検知する可能性を抑制することができる。本実施形態4に係る構成および動作は例えば実施形態2に対して適用することもできる。
図14は、本発明の実施形態5に係るECU11が電流遮断リレー61の故障診断を実施する手順を説明するフローチャートである。図3と比較すると、ステップS120からステップS140b、およびステップS230とステップS240が変更されている。ECU11の構成は実施形態1と同様である。
マイコン21は、リレー遮断時間aとリレー遮断時間bをセットする。リレー遮断時間aは、リレー遮断時間bよりも短い時間にセットする。リレー遮断時間bは、電流遮断リレー61を実際に遮断する時間(実施形態1におけるリレー遮断時間と同様)である。
マイコン21は、リレー遮断時間aに基づいて、上流電圧64aの上昇電圧分aを算出する。また、リレー遮断時間bに基づいて、上流電圧64bの上昇電圧分bを算出する。マイコン21はさらに、上昇電圧分aとbそれぞれに対応して、上限閾値aとb、下限閾値aとbをセットする。上下限閾値aとbは同一であってもよいし、範囲の一部が重複してもよい。下流電圧64aと64bの区別については後述する。
マイコン21は、電流遮断リレー61をオフしてから、リレー遮断時間aが経過したか否かを判断する。リレー遮断時間aを超えてない場合は本フローチャートを終了し、ステップS130a以降の電流遮断リレー61の診断処理は実施しない。リレー遮断時間aを超えている場合は、ステップS130aに進む。
マイコン21は、上流電圧64aを計測済みであるか否かを判断する。計測していない場合は、上流電圧64aを計測する。本フローチャートにおいては上流電圧64を2回測定するので、これらを区別するため添え字aとbを用いた。
マイコン21は、電流遮断リレー61をオフしてから、リレー遮断時間bが経過したか否かを判断する。リレー遮断時間bを超えてない場合は本フローチャートを終了し、ステップS131b以降の電流遮断リレー61の診断処理は実施しない。リレー遮断時間bを超えている場合は、ステップS131bへ進む。
マイコン21は、上流電圧64bを計測する。
マイコン21は、上流電圧64aが上限閾値aと下限閾値aの間にあるか否かを判断する(S140a)マイコン21は、上流電圧64bが上限閾値bと下限閾値bの間にあるか否かを判断する(S140b)。ステップS140aとステップS140bのいずれかの判断条件が成立しない場合、ステップS150へ進む。ステップS140aとステップS140bの判断条件がどちらも成立する場合、ステップS160へ進む。
マイコン21は、リレー診断フラグとタイマをリセットすることに加えて、上流電圧64aと64bをリセットする。
実施形態1においては、電流遮断リレー61がショート故障し、かつ、電流遮断リレー61の故障診断を実施しているときに、電流遮断リレー61の上流電圧64が変動し、上下限閾値の範囲に入る場合がある。そうすると、電流遮断リレー61がショート故障しているにも関わらず、マイコン21は電流遮断リレー61が正常であると誤診断してしまう。これに対し、本実施形態5に係るECU11は、電流遮断リレー61がショート故障している状態においても、電流遮断リレー61の上流電圧64を複数回監視し、1度でも上下限閾値の範囲外であることを検知すれば、故障状態であると判断する。これにより、上記現象による誤診断を回避することができる。本実施形態6に係る構成および動作は例えば実施形態2に対して適用することもできる。本実施形態6におけるリレー遮断時間aを複数設定しても同様の効果が得られる。
図16は、本発明の実施形態6に係るECU11の回路構成図である。本実施形態6においては、電流検出部29は駆動IC26の一部として構成されている。負荷電流33を制御する処理は、駆動IC26が備える電流制御部51によって実施される。この回路構成においても、実施形態1と同様の効果を得ることができる。また実施形態2のように複数の負荷駆動回路25を備える場合においても、同様の効果を得ることができる。
図17は、本発明の実施形態7に係るECU11の回路構成図である。本実施形態7に係るECU11は、実施形態1における負荷駆動回路25の位置と遮断回路60の位置が入れ替わった構成を備える。すなわち負荷駆動回路25は電磁誘導負荷14の下流側に配置され、遮断回路60は電磁誘導負荷14の上流側に配置されている。以下、この入れ替えにともなって実施形態1とは異なる点について説明する。
実施形態1~7においては、電流遮断リレー61を遮断してからリレー遮断時間が経過した時点において、上流電圧64を計測することを説明した。本発明の実施形態8に係るECU11は、これに代えて電圧検出部23が検出する電圧の立ち上がりエッジと立ち下がりエッジをそれぞれ検出することにより、上流電圧64を計測するタイミングを定める。その他構成は実施形態1~7と同様であるため、以下ではエッジ検出に関連する差異点について主に説明する。
本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施例の構成の一部を他の実施例の構成に置き換える事が可能であり、また、ある実施例の構成に他の実施例の構成を加えることも可能である。また、各実施例の構成の一部について他の構成の追加・削除・置換をすることができる。
Claims (11)
- 電磁誘導負荷を駆動する電磁負荷駆動装置であって、
前記電磁誘導負荷に対して供給する通電電流を制御する第1スイッチ、
前記電磁誘導負荷に対して直列に接続され、前記通電電流を遮断するか否かを切り替える第2スイッチ、
前記第2スイッチと前記電磁誘導負荷との間の電圧を検出する電圧検出部、
前記第1スイッチが前記通電電流を制御している間において前記第2スイッチが前記通電電流を遮断したとき前記電圧検出部が検出するサージ電圧に基づいて前記通電電流の通電経路が正常であるか否かを診断する演算部、
を備えることを特徴とする電磁負荷駆動装置。 - 前記演算部は、前記サージ電圧に基づいて前記第2スイッチが正常であるか否かを診断する
ことを特徴とする請求項1記載の電磁負荷駆動装置。 - 前記演算部は、前記サージ電圧が所定の上下限電圧値の範囲内に収まっている場合は前記第2スイッチが正常であると診断し、収まっていない場合は異常であると診断する
ことを特徴とする請求項2記載の電磁負荷駆動装置。 - 前記電磁負荷駆動装置は、前記通電電流の大きさと、前記第2スイッチを遮断している間における前記通電電流の目標電流からの変動幅を所定範囲内に収めることができる前記第2スイッチの遮断許容時間との間の対応関係を表すデータを格納する記憶部を備え、
前記演算部は、前記遮断許容時間以内の時間で前記第2スイッチにより前記通電電流を遮断させる
ことを特徴とする請求項1記載の電磁負荷駆動装置。 - 前記電磁負荷駆動装置は、複数の前記電磁誘導負荷を駆動するように構成されており、
前記演算部は、前記複数の電磁誘導負荷のうち前記電磁負荷駆動装置が駆動しているものに対して供給されている前記通電電流の大きさに対応する前記遮断許容時間にしたがって、前記第2スイッチにより前記通電電流を遮断させる
ことを特徴とする請求項4記載の電磁負荷駆動装置。 - 前記演算部は、前記電磁誘導負荷に流れる電流が定常状態である間において前記第2スイッチを遮断するとともに前記診断を実施し、
前記演算部は、前記電磁誘導負荷に流れる電流が過渡的に変動している間は前記診断を実施しない
ことを特徴とする請求項1記載の電磁負荷駆動装置。 - 前記演算部は、前記第1スイッチを駆動する駆動信号のデューティ比を取得し、
前記演算部は、前記デューティ比が所定の上下限デューティ値の範囲内に収まっている場合は前記第2スイッチを遮断するとともに前記診断を実施し、
前記演算部は、前記デューティ比が前記上下限デューティ値の範囲内に収まっていない場合は前記診断を実施しない
ことを特徴とする請求項1記載の電磁負荷駆動装置。 - 前記電圧検出部は、前記第2スイッチが前記通電電流を遮断している間において第1の前記サージ電圧と第2の前記サージ電圧を検出し、
前記演算部は、前記第1のサージ電圧が第1上下限電圧の範囲内に収まっているとともに前記第2のサージ電圧が第2上下限電圧の範囲内に収まっている場合は前記第2スイッチが正常であると診断し、いずれかが収まっていない場合は異常であると診断する
ことを特徴とする請求項3記載の電磁負荷駆動装置。 - 前記演算部は、前記電圧検出部の検出結果の立ち上がりエッジと立ち下がりエッジを検出するエッジ検出回路を備え、
前記演算部は、前記エッジ検出回路が前記立ち上がりエッジを検出した時点と前記立ち下がりエッジを検出した時点それぞれにおいて、前記電圧検出部が検出する前記サージ電圧を取得し、取得した前記サージ電圧に基づき前記通電電流の通電経路が正常であるか否かを診断する
ことを特徴とする請求項1記載の電磁負荷駆動装置。 - 前記電磁負荷駆動装置は、前記通電電流の大きさと、前記第2スイッチを遮断している間における前記通電電流の目標電流からの変動幅を所定範囲内に収めることができる前記第2スイッチの遮断許容時間との間の対応関係を表すデータを格納する記憶部を備え、
前記演算部は、前記エッジ検出回路が検出した前記立ち上がりエッジが前記遮断許容時間の範囲内に収まっていない場合は、前記診断を実施せず、
前記演算部は、前記エッジ検出回路が検出した前記立ち下がりエッジが前記遮断許容時間以後の所定時間範囲内に収まっていない場合は、前記診断を実施しない
ことを特徴とする請求項9記載の電磁負荷駆動装置。 - 電磁誘導負荷、
前記電磁誘導負荷を駆動する電磁負荷駆動装置、
を備えた車載制御システムであって、
前記電磁負荷駆動装置は、
前記電磁誘導負荷に対して供給する通電電流を制御する第1スイッチ、
前記電磁誘導負荷に対して直列に接続され、前記通電電流を遮断するか否かを切り替える第2スイッチ、
前記第2スイッチと前記電磁誘導負荷との間の電圧を検出する電圧検出部、
前記第1スイッチが前記通電電流を制御している間において前記第2スイッチが前記通電電流を遮断したとき前記電圧検出部が検出するサージ電圧に基づいて前記通電電流の通電経路が正常であるか否かを診断する演算部、
を備えることを特徴とする車載制御システム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017563767A JP6625668B2 (ja) | 2016-01-29 | 2017-01-10 | 電磁負荷駆動装置、車載制御システム |
CN201780004151.6A CN108292920B (zh) | 2016-01-29 | 2017-01-10 | 电磁负载驱动装置以及车载控制*** |
US16/073,636 US10770886B2 (en) | 2016-01-29 | 2017-01-10 | Electromagnetic load drive device and in-vehicle control system |
DE112017000230.3T DE112017000230B4 (de) | 2016-01-29 | 2017-01-10 | Ansteuervorrichtung für eine elektromagnetische Last und Fahrzeugsteuersystem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016016317 | 2016-01-29 | ||
JP2016-016317 | 2016-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017130669A1 true WO2017130669A1 (ja) | 2017-08-03 |
Family
ID=59398014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/000364 WO2017130669A1 (ja) | 2016-01-29 | 2017-01-10 | 電磁負荷駆動装置、車載制御システム |
Country Status (5)
Country | Link |
---|---|
US (1) | US10770886B2 (ja) |
JP (1) | JP6625668B2 (ja) |
CN (1) | CN108292920B (ja) |
DE (1) | DE112017000230B4 (ja) |
WO (1) | WO2017130669A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6652103B2 (ja) * | 2017-04-19 | 2020-02-19 | 株式会社デンソー | 車両の自動運転制御システム |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000152691A (ja) * | 1998-11-12 | 2000-05-30 | Honda Motor Co Ltd | 電動機駆動装置 |
JP2002345291A (ja) * | 2001-05-14 | 2002-11-29 | Denso Corp | 電磁作動器駆動装置 |
JP2004201410A (ja) * | 2002-12-18 | 2004-07-15 | Denso Corp | 誘導性負荷駆動装置及びその異常検出方法 |
JP2006005581A (ja) * | 2004-06-16 | 2006-01-05 | Yazaki Corp | 半導体スイッチの制御装置 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4033937B2 (ja) | 1997-02-19 | 2008-01-16 | 株式会社日立製作所 | ソレノイドバルブの異常検出装置 |
JPH11218256A (ja) | 1998-02-02 | 1999-08-10 | Nec Home Electron Ltd | 電磁弁診断装置 |
JP2002324710A (ja) * | 2000-12-28 | 2002-11-08 | Komatsu Ltd | 誘導負荷の異常判断装置および方法 |
DE10235297B3 (de) * | 2002-08-02 | 2004-02-19 | Moeller Gmbh | Steueranordnung für einen elektromagnetischen Antrieb |
DE102005028184A1 (de) * | 2005-06-17 | 2006-12-21 | Siemens Ag | Schaltungsanordnung mit einem Eigendiagnosesystem zum Ansteuern und Überwachen einer Last in einer Brückenschaltung und dazugehöriges Betriebsverfahren |
CN100550633C (zh) * | 2005-07-27 | 2009-10-14 | 展嘉科技股份有限公司 | 具有输出回馈的电磁耦合数字输出电路 |
JP4359855B2 (ja) * | 2007-07-09 | 2009-11-11 | Smc株式会社 | 電磁弁駆動回路及び電磁弁 |
WO2010020898A1 (en) * | 2008-08-19 | 2010-02-25 | Nxp B.V. | A surge protection circuit |
CN102315692B (zh) * | 2010-06-29 | 2013-09-18 | 富达通科技股份有限公司 | 高功率无线感应式电源供应器的电源传输方法 |
CN102324920B (zh) * | 2011-04-13 | 2013-05-01 | 北京卫星制造厂 | 一种适用于航天器直流电源***的故障隔离电子开关 |
JP5338845B2 (ja) | 2011-04-22 | 2013-11-13 | 株式会社デンソー | スタータ制御装置の異常検出装置 |
JP6139130B2 (ja) * | 2012-12-27 | 2017-05-31 | 矢崎総業株式会社 | 電磁誘導負荷の制御装置 |
WO2015053206A1 (ja) * | 2013-10-10 | 2015-04-16 | 日立オートモティブシステムズ株式会社 | 電子制御装置 |
JP6445699B2 (ja) * | 2015-07-23 | 2018-12-26 | 日立オートモティブシステムズ株式会社 | 車載制御装置、車載制御システム |
-
2017
- 2017-01-10 US US16/073,636 patent/US10770886B2/en active Active
- 2017-01-10 CN CN201780004151.6A patent/CN108292920B/zh active Active
- 2017-01-10 WO PCT/JP2017/000364 patent/WO2017130669A1/ja active Application Filing
- 2017-01-10 DE DE112017000230.3T patent/DE112017000230B4/de active Active
- 2017-01-10 JP JP2017563767A patent/JP6625668B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000152691A (ja) * | 1998-11-12 | 2000-05-30 | Honda Motor Co Ltd | 電動機駆動装置 |
JP2002345291A (ja) * | 2001-05-14 | 2002-11-29 | Denso Corp | 電磁作動器駆動装置 |
JP2004201410A (ja) * | 2002-12-18 | 2004-07-15 | Denso Corp | 誘導性負荷駆動装置及びその異常検出方法 |
JP2006005581A (ja) * | 2004-06-16 | 2006-01-05 | Yazaki Corp | 半導体スイッチの制御装置 |
Also Published As
Publication number | Publication date |
---|---|
CN108292920B (zh) | 2021-07-09 |
US20190036325A1 (en) | 2019-01-31 |
JP6625668B2 (ja) | 2019-12-25 |
DE112017000230T5 (de) | 2018-10-04 |
US10770886B2 (en) | 2020-09-08 |
CN108292920A (zh) | 2018-07-17 |
DE112017000230B4 (de) | 2023-08-10 |
JPWO2017130669A1 (ja) | 2018-08-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6445699B2 (ja) | 車載制御装置、車載制御システム | |
JP4643419B2 (ja) | 自己診断機能を備えた負荷駆動装置 | |
JP6748935B2 (ja) | 電流センス付き半導体スイッチの保護回路 | |
JP6649509B2 (ja) | 車載制御装置 | |
JPWO2015118772A1 (ja) | 負荷駆動回路 | |
JP6582133B2 (ja) | 車載制御装置 | |
US10970147B2 (en) | Electronic control device and operation control method therefor | |
US20170019098A1 (en) | Driving circuit of switching device for electric power control | |
JP3687472B2 (ja) | 温度検出装置 | |
US9537300B2 (en) | Load driving device | |
WO2017130669A1 (ja) | 電磁負荷駆動装置、車載制御システム | |
JP2012244895A (ja) | 電気自動車のコンバータ制御方法及びその装置 | |
JP5496257B2 (ja) | 電動パワーステアリング制御装置 | |
KR101596025B1 (ko) | 페일 세이프 소프트웨어의 오류 검출 방법 | |
US11223195B2 (en) | Control device and method for power supply to EPS in vehicle | |
JP2004213454A (ja) | 負荷の故障診断方法および装置 | |
JP6577599B2 (ja) | 車両用制御装置 | |
CN109690333B (zh) | 电子控制装置和电子控制装置的连接状态的诊断方法 | |
JP2015142452A (ja) | モータ駆動装置 | |
JP5950442B2 (ja) | 電子制御装置 | |
JP2021079733A (ja) | 車載電子制御装置 | |
JP2009089072A (ja) | 電磁負荷装置の制御装置 | |
JP2013143818A (ja) | 半導体ヒューズ装置 | |
JP2009231409A (ja) | リニアソレノイド駆動装置 | |
WO2023228592A1 (ja) | バッテリ遮断システムおよび故障検出方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17743900 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2017563767 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112017000230 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 17743900 Country of ref document: EP Kind code of ref document: A1 |