JP2017109712A - On-vehicle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle system that enables data communication with a storage device during discharge operation of a device that is a source of emitting noise, and that shortens time required for data communication with the storage device.SOLUTION: An on-vehicle system comprises: a device including a step-up converter; and an electronic control device including a micro-computer and a storage device. The micro-computer comprises: detection means that detects a point in time that a voltage decrease pattern starts during a discharge period in which a step-like voltage decrease pattern in voltage output from the step-up converter continues; acquisition means for acquiring time from the detected point in time that the voltage decrease pattern starts to a point in time that the subsequent voltage decrease pattern starts; estimation means for estimating, from the time acquired by the acquisition means, a period in which noise due to the step-up converter is emitted; and communication means that communicates with a storage device and interrupts data communication during the period in which noise is emitted, estimated by the estimation means.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an in-vehicle system.

  2. Description of the Related Art Conventionally, an in-vehicle system that completes data write processing within a limited time while preventing failure of data write processing to a storage unit due to operation of a noise generation source is known (for example, Patent Document 1).

  The in-vehicle system disclosed in Patent Document 1 is a process of prohibiting communication of data to the storage unit and writing the data transferred to the buffer of the storage unit into the storage unit during the discharge operation of the device that is the source of noise. Execution is permitted. As a result, the in-vehicle system can process the process of writing the data transferred to the buffer of the storage unit in the storage unit in parallel with the discharge operation, thus preventing failure of the data writing to the storage unit. The time required for writing can be shortened.

JP2015-55926A

  Since the in-vehicle system disclosed in Patent Document 1 prohibits data communication to the storage device during the discharge operation of the device that is a source of noise, the storage device is in accordance with the period during which the discharge is performed. There is a problem that it takes a long time to communicate data.

  The embodiment of the present invention has been made in view of the above-described problems, and enables data communication with a storage device during discharge operation of a device that is a source of noise, and data to the storage device. It aims at providing the vehicle-mounted system which shortens the time which communication requires.

In order to solve the above problems, an in-vehicle system according to an embodiment of the present invention boosts a voltage of a battery, outputs a boosted output voltage, and is supplied from the battery via the boost converter. An in-vehicle system including an apparatus including an inverter that supplies electric power to a rotary motor, a microcomputer that controls the apparatus, and an electronic control unit that includes a storage device that stores data,
The microcomputer includes: a detecting unit that detects a start time of the voltage drop pattern in a discharge period in which a stepped voltage drop pattern of the output voltage continues after ignition off; and a start of the voltage drop pattern detected by the detecting unit An acquisition means for acquiring a time from a time point to a start time of the next voltage drop pattern; an estimation means for estimating a period during which noise from the boost converter is generated from the time acquired by the acquisition means; and Communication means for performing data communication with the storage device during a period excluding the period estimated by the estimation means, and for interrupting data communication with the storage device during the period estimated by the estimation means in the discharge period; Have

  According to the present embodiment, since data communication with the storage device is interrupted during the noise generation period estimated by the estimation means in the discharge period, even if noise occurs, the device that is the source of noise generation Data communication with the storage device becomes possible during the discharge operation. In addition, since data communication with the storage device is performed during a period excluding the period estimated by the estimation unit in the discharge period, data communication to the storage device is performed compared to a case where data communication is performed after the discharge period. Can be shortened.

  According to an embodiment of the present invention, an in-vehicle system is provided that enables data communication with a storage device during a discharge operation of a device that is a source of noise, and reduces the time required for data communication to the storage device. be able to.

It is a block diagram which shows an example of the system configuration | structure of the vehicle-mounted system which concerns on one Embodiment. It is a figure which shows the relationship between termination control by the vehicle-mounted system which concerns on one Embodiment, and the time restrictions from IG-OFF of a vehicle to MREL-OFF (power supply stop). It is a figure for demonstrating shortening of the waiting time which concerns on one Embodiment. It is a figure which shows the example of the relationship between the change of the voltage (VH) of the boost converter which concerns on one Embodiment, and a communication permission state. It is a functional lineblock diagram of an in-vehicle system concerning one embodiment. It is a figure which shows the image of the estimation procedure of the noise generation timing which concerns on one Embodiment. It is a flowchart which shows the example of the communication process of the vehicle-mounted system which concerns on one Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

<System configuration>
FIG. 1 is a block diagram illustrating an example of an in-vehicle system according to an embodiment.

  The in-vehicle system 1 is a system mounted on a vehicle having an electric motor as one of drive sources. Note that the vehicle on which the in-vehicle system 1 is mounted may be a hybrid vehicle on which an engine is also mounted, or an electric vehicle that uses only an electric motor as a drive source.

  The in-vehicle system 1 includes an MG-ECU 10, an auxiliary battery 20, an MREL (power supply relay) 25, an HV battery 30, a motor generator (hereinafter referred to as MG) 40, an IPM (Intelligent Power Module) 50, and the like.

  The auxiliary battery 20 is a power storage device with a low voltage (about 12V to 14V). For example, although a lead storage battery etc. can be used, it is not restricted to these, Arbitrary secondary batteries may be used and a capacitor etc. may be used. The auxiliary battery 20 supplies electric power to various ECUs of the vehicle such as an MG-ECU 10 described later, an electrical component such as a headlamp, and a wiper.

  The MREL 25 is a power supply relay provided on a power supply line that supplies power from the auxiliary battery 20 to the MG-ECU 10 and the like. The MREL 25 is connected or disconnected according to a command from a power supply ECU (not shown). For example, the MREL 25 is shut off after a predetermined time elapses after the ignition is turned off (hereinafter referred to as IG-OFF).

  The ignition off means that the ignition switch is turned off, and the ignition switch starts (ignitions on) the vehicle in a state where it can run (ignitions on) or ends (stops) the state where the vehicle can run (ignition off). ). Accordingly, the ignition off (IG-OFF) does not mean that the engine is stopped when the vehicle is a hybrid vehicle. For example, the integrated control ECU (not shown) of the vehicle is stopped and the vehicle can travel. Including terminating the state.

  The HV battery 30 is a power storage device that supplies power to the MG 40. For example, although a lithium ion battery, a nickel metal hydride battery, etc. can be used, it is not restricted to these, You may use arbitrary secondary batteries. Further, a capacitor or the like may be used.

  The MG 40 is a rotary motor as one of the drive sources of the vehicle, and is also a generator. For example, the MG 40 may drive the vehicle with the electric power supplied from the HV battery 30 and function as a generator by a regenerative operation when the vehicle decelerates to charge the HV battery 30 with the generated electric power. When the vehicle is a hybrid vehicle, the MG 40 may be driven by an engine (not shown) to generate power. The generated electric power may be supplied to another rotary electric motor provided in the vehicle, or the HV battery 30 may be charged. The MG 40 is driven by three-phase AC power supplied via an inverter 52 included in the IPM 50 described later.

  The IPM (device) 50 is a drive device for driving the MG 40 using electric power supplied from the HV battery 30, and includes a boost converter 51 and an inverter 52.

  Boost converter 51 boosts the voltage of HV battery 30 to a predetermined voltage (drive voltage of MG 40). Boost converter 51 includes an input capacitor 53, a reactor 54, transistors SW11, SW12, and the like, and a boosting operation is realized by switching control of transistors SW11, SW12 by MG-ECU 10 (microcomputer 11) described later. For example, when the MG 40 generates power, the boost converter 51 steps down the generated power supplied via the inverter 52 and supplies it to the HV battery 30. Also in the case of step-down, the step-down operation is realized by performing switching control of the transistors SW11 and SW12 by the MG-ECU 10 (microcomputer 11) as in the case of step-up. Boost converter 51 includes drive circuits (not shown) for transistors SW11 and SW12, and switching control by MG-ECU 10 (microcomputer 11) is performed via the drive circuits.

  The inverter 52 is a power conversion device that converts DC power supplied from the HV battery 30 through the boost converter 51 into three-phase AC power and supplies the three-phase AC power to the MG 40. The inverter 52 includes U-phase transistors SW1 (upper arm) and SW2 (lower arm), V-phase transistors SW3 (upper arm) and SW4 (lower arm), and W-phase transistor SW5 (upper arm). , SW6 (lower arm). The inverter 52 can convert DC power into three-phase AC power and supply it to the MG 40 by switching control of the transistors SW1 to SW6 by an MG-ECU 10 (microcomputer 11) described later. The inverter 52 includes a drive circuit (not shown) for the transistors SW1 to SW6, and switching control by the MG-ECU 10 (microcomputer 11) is performed via the drive circuit.

  The inverter 52 includes a smoothing capacitor 56, a discharge resistor 55, and the like.

  The smoothing capacitor 56 is provided to smooth the current input to the inverter 52 and suppress noise emission and surge voltage.

  The discharge resistor 55 is provided to discharge the charge remaining in the smoothing capacitor 56 at the time of IG-OFF or the like. Note that a switch (eg, a transistor) or the like may be provided so that current can be supplied only when discharging.

  The MG-ECU (electronic control unit) 10 is a control unit that performs drive control of the MG 40, and includes a microcomputer 11, a nonvolatile memory 12, and the like. The MG-ECU 10 operates by supplying power from the auxiliary battery 20.

  The microcomputer 11 is a ROM that stores a control program, a CPU that loads a predetermined control program from the ROM, performs arithmetic processing, a readable / writable RAM that stores arithmetic results, a timer, a counter, and an A / D (Analog / Digital) Includes conversion circuit, input / output interface, etc. By executing each control program on the CPU, the microcomputer 11 controls the boost converter 51, which will be described later, the control of the MG 40, the discharge control of the smoothing capacitor 56, and the non-volatile memory 12 such as the control learning value and abnormality information. Various processes such as writing control are executed.

  The microcomputer 11 controls the boost operation of the boost converter 51. Specifically, in order to boost the supply voltage from the HV battery 30 to a predetermined voltage (MG40 drive voltage), feedback based on a signal from a voltage sensor (not shown) that measures the voltage on the output side of the boost converter 51. Take control. The microcomputer 11 calculates the duty ratio of the transistors SW11 and SW12 and outputs a PWM (Pulse Width Modulation) signal to the boost converter 51 (drive circuit).

  Further, the microcomputer 11 receives a torque command calculated by an integrated control ECU (not shown) of the vehicle based on the accelerator operation amount by the driver, the state of the HV battery 30, the vehicle state, etc., and the torque along the torque command is The MG 40 is controlled via the inverter 52 so as to be output.

  Further, the microcomputer 11 performs control (hereinafter referred to as discharge control) for discharging the residual charge of the smoothing capacitor 56 provided on the input side of the inverter 52 and the input capacitor 53 of the boost converter 51. Since the smoothing capacitor 56 and the input capacitor 53 during the vehicle IG-ON are at a high voltage, the circuit in the IPM 50 does not function normally by discharging the residual charge at an early stage in the event of a vehicle collision. In some cases, the occurrence of problems due to residual charges can be prevented.

  The microcomputer 11 performs the discharge control by driving the boost converter 51 so that the electric charge stored in the smoothing capacitor 56 is discharged. At this time, the microcomputer 11 controls the inverter 52 using the coils of the respective phases (U phase, V phase, W phase) of the MG 40 so as to forcibly discharge the MG 40 without generating torque.

  Further, the microcomputer 11 writes (stores) information such as a control learning value and abnormality information in the nonvolatile memory 12 until the MREL 25 is shut off (hereinafter referred to as MREL-OFF) at the time of IG-OFF. ) Control (write control). The control learning value is a value related to the control of the boost converter 51, the MG 40 (inverter 52), etc., and is a value held for use in control during the next IG-ON. For example, sensors used for feedback control (voltage sensor for measuring the voltage on the output side of the boost converter 51) and origin information (initial position information at the next IG-ON) of an actuator such as a rotor of the MG 40 are included. Good. Further, the abnormality information is information regarding the abnormality that has occurred. For example, FDG (Freeze Frame Data) that stores a diagnosis code of an abnormality that has occurred and a vehicle state (various control information) at the time of occurrence of the abnormality may be included. Since the control learning value needs to be updated according to the control state during IG-ON, it is written (stored) between IG-OFF and MREL-OFF. In addition, because there is a possibility that only a limited number can be stored by sequential storage due to storage capacity restrictions and the like, abnormality information is prioritized (for example, abnormality information priority between IG-OFF and MREL-OFF). It is written (stored) according to the degree of influence on the vehicle.

The non-volatile memory 12 is a storage device capable of holding stored information regardless of whether or not power is supplied. For example, an EEPROM (Electrically Erasable Programmable Read Only Memory) may be used. Further, an MRAM (Magnetic Resistive Random Access Memory), FeRAM (Ferroelectric Random Access Memory), or the like may be used. The nonvolatile memory 12 stores control learning values, abnormality information, and the like by the microcomputer 11 described above.

  Here, the time from IG-OFF to MREL-OFF is defined in advance. Therefore, as shown in FIG. 2, the microcomputer 11 needs to complete the end control including the above-described discharge control and write control within the constraint time. Therefore, it is preferable that the discharge control and the write control are processed in parallel. The time from IG-OFF to MREL-OFF corresponds to the time from when the vehicle driver performs an operation to turn off an ignition switch (not shown) until the vehicle is turned off. Therefore, after IG-OFF, the time from IG-OFF to MREL-OFF is set to a predetermined time so that the driver does not feel uncomfortable because the driver cannot leave the vehicle immediately.

  However, since the discharge control involves switching operations of the transistors SW11 and SW12 included in the boost converter 51, noise is generated. For this reason, there is a possibility that the data to be stored changes during the access to the nonvolatile memory 12 in the write control due to the influence of the noise (data corruption). Therefore, when the discharge control and the write control are simply processed in parallel, the data such as the control learning value and the abnormality information written in the nonvolatile memory 12 may change unintentionally.

  Therefore, for example, in the technique disclosed in Patent Document 1, the microcomputer 11 performs a process that is not affected by noise in the write control sequence to the nonvolatile memory 12 during the discharge period, and after the discharge period, the microcomputer 11 Data communication with the memory 12 is executed.

(About shortening the waiting time)
FIG. 3 is a diagram for explaining shortening of the waiting time according to the embodiment.

  When the user turns off the IG-SW at time t <b> 1 in FIG. 3, the microcomputer 11 drives the boost converter 51 and performs discharge control to reduce the voltage VH of the boost converter 51. Along with this, noise is generated from the boost converter 51 by the above-described discharge control during the period up to the time t3 when the voltage of the boost converter is stabilized (discharge period).

  In the conventional technique, after this discharge period, for example, after time t3 in FIG. 3, data communication from the microcomputer 11 to the nonvolatile memory 12 is started. Further, when the data communication is completed at time t7 in FIG. 3, the holding request for the MREL 25 is controlled to be turned off by the power supply ECU or the like at time t8 in FIG. 3, and the MREL 25 is shut off. Thereby, for example, the vehicle can execute the process of turning on the ignition again (re-IG-ON process) at time t9 in FIG. In the example of FIG. 3, for example, when the IG-SW is turned on again by a user operation at time t2 in FIG. 3, a waiting time for re-IG-ON processing occurs until time t9.

  On the other hand, in the present embodiment, when the IG-SW is turned off by the user at time t1 in FIG. 3, the microcomputer 11 causes the data to be stored in the nonvolatile memory 12 at time t1, for example. Start communication. At this time, the microcomputer 11 performs communication of data by guaranteeing communication data to the nonvolatile memory 12 by a communication process described later.

  Thus, for example, when the data communication is completed at time t4 in FIG. 3, the holding request for the MREL 25 is controlled to be turned off by the power supply ECU or the like at time t5 in FIG. Thereby, for example, the vehicle can execute the process of turning on the ignition again (re-IG-ON process) at time t6 in FIG.

  Therefore, in the example of FIG. 3, the waiting time required from the time t2 to the time t9 in the prior art is reduced to the waiting time from the time t2 to the time t6 in the present embodiment.

(Outline of communication processing)
FIG. 4 is a diagram illustrating an example of a relationship between a change in voltage (VH) of a boost converter and a communication permission state according to an embodiment. This figure shows the relationship between the voltage change of the boost converter during the discharge period shown in FIG. 3 and the state of data communication (hereinafter referred to as EEPROM communication) to the nonvolatile memory 12 of the microcomputer 11.

  In the discharge period of FIG. 3, the microcomputer 11 reduces the voltage of the boost converter 51 (hereinafter referred to as VH) by the discharge control described above. For example, in FIG. 4, the microcomputer 11 periodically switches the transistor of the boost converter 51 at the period T1 from the time t3 to gradually decrease the voltage VH. This period T1 is determined by, for example, a control command value controlled by a program that operates on the microcomputer 11.

  In FIG. 4, when the transistor is switched at time t3, noise larger than the other periods is generated from the boost converter 51 of the IPM 50 in the period T2 until the time t4 when the voltage VH is stabilized. Therefore, if the microcomputer 11 performs EEPROM communication for communicating data to the nonvolatile memory 12 during the discharge period of FIG. 3, the data “D” and “E” communicated during the period T2 of FIG. , The possibility that the data will change (data will be garbled) increases. Similarly, when transistor switching is performed under the control of the microcomputer 11 at time t7 in FIG. 4, the data “H” communicated between time t7 and time t8 changes due to the influence of noise. Is more likely to do.

  Therefore, for example, in FIG. 4, the microcomputer 11 according to the present embodiment performs EEPROM communication during periods “A”, “B”, and “C”, in which data is unlikely to change due to transistor switching of the boost converter 51. Permit, and do not permit EEPROM communication during the period of “D” and “E”, where data is likely to change. Similarly, in FIG. 4, the microcomputer 11 permits the EEPROM communication during the periods of “F”, “G”, “I”, and “J”, in which data is unlikely to change due to switching of the transistor of the boost converter 51. The EEPROM communication during the “H” period during which data is highly likely to change is not permitted.

  Thereby, the microcomputer 11 can perform data communication with the nonvolatile memory 12 during the discharge operation of the boost converter 51 serving as a noise generation source, and can shorten the time required for data communication with the nonvolatile memory 12. become able to.

  Next, a specific configuration and processing contents will be described.

<Functional configuration>
FIG. 5 is a functional configuration diagram of the in-vehicle system according to the embodiment. The in-vehicle system 1 includes an IPM (device) 50 including a boost converter 51 and an inverter 52 in FIG. 1, and an MG-ECU (electronic control device) 10 including a microcomputer 11 and a nonvolatile memory 12.

  The microcomputer (microcomputer) 11 is an information processing apparatus that controls the IPM 50. By executing a predetermined program, the microcomputer 11 functions as, for example, the control unit 111, the voltage drop detection unit 112, the timing acquisition unit 113, the generation period estimation unit 114, the communication unit 115, the storage unit 116, and the like illustrated in FIG. To realize.

  The control unit 111 is means for controlling a device (IPM 50) including the boost converter 51 that is a noise generation source. For example, the control unit 111 performs the above-described discharge control on the boost converter 51 and the inverter 52 included in the IPM 50.

  The voltage drop detection unit (detection means) 112 is a means for detecting the start point of the voltage drop pattern in the discharge period in which the voltage drop pattern of the boost converter 51 continues after the ignition is turned off. For example, the voltage drop detection unit 112 measures the voltage VH of the boost converter 51 using an A / D converter or the like built in the microcomputer 11, and the boost converter 51 as shown at time t3 in FIG. The start of the voltage drop due to the switching of the transistor is detected.

  FIG. 6 is a diagram illustrating an image of a noise generation timing estimation procedure according to an embodiment. In the example of FIG. 6, for example, when the IG-SW is turned off by a user operation at time t1, a step-like voltage drop pattern due to switching of the transistors of the boost converter 51 continues at times t2, t3, t6, and t9. Occur. The voltage drop detection unit 112 detects, for example, t2, t3, t6, and t9, which are the start points of the step-like voltage drop pattern due to the switching of the transistors.

  Returning to FIG. 5, the description of the functional configuration of the microcomputer 11 will be continued.

  The timing acquisition unit (acquisition means) 113 detects a time (for example, a counter value) from the start time of the voltage drop pattern in the output voltage of the boost converter 51 detected by the voltage drop detection unit 112 to the start time of the next voltage drop pattern. ) To get.

  For example, when a voltage drop due to switching of the transistor of the boost converter 51 is detected at time t2 in FIG. 6, the timing acquisition unit 113 acquires time until a time t3 at which a voltage drop due to switching is detected next. For example, the timing acquisition unit 113 starts counting a noise generation timing estimation counter (hereinafter referred to as a counter) at time t2 in FIG. 6, acquires the count value up to time t3, and stores the count value in the storage unit 116.

  The generation period estimation unit (estimation unit) 114 is a unit that estimates a period (for example, a counter value) in which noise is generated by the boost converter 51 from the time acquired by the timing acquisition unit 113.

  For example, when the voltage drop detection unit 112 detects the start time of the second or subsequent voltage drop pattern due to the switching of the transistor of the boost converter 51, the generation period estimation unit 114 initializes the count value of the counter and counts up the counter To resume. Further, the generation period estimation unit 114 is a period during which noise is generated by the boost converter 51 based on the count value acquired and stored by the timing acquisition unit 113 (for example, from time t5 to t7 and from time t8 to t10 in FIG. 6). Etc.).

  For example, the timing acquisition unit 113 counts from time t2 to t3 in FIG. 6 and sets the count value stored in the storage unit 116 to “cnt”. For example, the occurrence period estimation unit 114 sets the time points when the counter value becomes the first predetermined value (for example, “cnt × 90%”) as times t5 and t8 in FIG. Note that 90% of “cnt × 90%” is merely an example. This value is determined in advance by, for example, experiments or calculations.

  Similarly, the occurrence period estimation unit 114 sets, for example, times t4, t7, and t10 in FIG. 6 when the counter value reaches a second predetermined value (for example, “cnt × 10%”). Note that 10% of “cnt × 10%” is merely an example. This value is determined in advance by, for example, experiments or calculations.

  In the above example, for example, the timing acquisition unit 113 calculates a period from the counter value “0” to “cnt × 10%” and a period from the counter value “cnt × 90%” to “cnt”. The period during which noise is generated by the boost converter 51 is estimated (or determined).

  The communication unit (communication means) 115 performs EEPROM communication with a nonvolatile memory (storage device) 12 that stores data. The communication unit 115 according to the present embodiment performs EEPROM communication with the nonvolatile memory 12 during the discharge period illustrated in FIG. 3 except for the period during which the noise estimated by the generation period estimation unit 114 is generated. Further, the communication unit 115 interrupts the EEPROM communication during a period in which the noise estimated by the generation period estimation unit 114 is generated.

  For example, in the example of FIG. 6, the communication unit 115 starts EEPROM communication from time t4, and interrupts EEPROM communication at time t5 when the counter value becomes “cnt × 90%”. Further, the communication unit 115 initializes the counter at time t6, continues the interruption of the EEPROM communication until the time t7 when the value of the counter becomes “cnt × 10%”, and resumes the EEPROM communication after the time t7. . Similarly, the communication unit 115 interrupts the EEPROM communication from time t8 to time t10 in FIG.

  The storage unit 116 is means for storing, for example, the count value acquired by the timing acquisition unit 113. The memory | storage part 116 is implement | achieved by the program etc. which operate | move with RAM of the microcomputer 11, and the microcomputer 11, for example.

<Process flow>
First, the flow of communication processing according to the present embodiment will be described with reference to FIG.

  At time t1 in FIG. 6, for example, when the IG-SW is turned off by a user operation, for example, communication processing is performed in the following four steps.

(STEP1)
At time t <b> 2 in FIG. 6, the voltage drop detection unit 112 of the microcomputer 11 detects the start time (first time) of the stepped voltage drop pattern in the output voltage of the boost converter 51. In response to detection of the start time (first time) of this voltage drop pattern, the timing acquisition unit 113 initializes the counter and starts counting up the counter. The counter may be initialized in advance.

(STEP2)
At time t <b> 3 in FIG. 6, the voltage drop detection unit 112 of the microcomputer 11 detects the start time (second time) of the stepped voltage drop pattern in the output voltage of the boost converter 51. In response to detection of the start time (second time) of the voltage drop pattern, the timing acquisition unit 113 stores the count value (cnt) of the counter at the start time (second time) of the voltage drop pattern in the storage unit 116.

  In addition, the generation period estimation unit 114 of the microcomputer 11 initializes the counter and restarts counting up.

  Furthermore, the generation period estimation unit 114 calculates the counter value (for example, “cnt × 90%”) at times t5 and t8 from the count value “cnt” stored in the storage unit 116 by the timing acquisition unit 113. Similarly, the occurrence period estimation unit 114 calculates the counter value (eg, “cnt × 10%”) at times t4, t7, and t10 from the count value “cnt” stored in the storage unit 116 by the timing acquisition unit 113. To do.

(STEP3)
When the value of the counter reaches, for example, “cnt × 10%” at time t4 in FIG. 6, the communication unit 115 starts EEPROM communication.

  Further, when the counter value becomes, for example, “cnt × 90%” at time t5 in FIG. 6, the communication unit 115 interrupts the EEPROM communication.

(STEP4)
At time t <b> 6, the voltage drop detection unit 112 of the microcomputer 11 detects the start time (third time) of the stepped voltage drop pattern in the output voltage of the boost converter 51. In response to detection of the start time (third time) of this voltage drop pattern, the generation period estimation unit 114 initializes the counter and restarts counting up.

  Subsequent processing is basically repetition of STEP3 and STEP4.

  For example, at time t7 in FIG. 6, when the counter value becomes “cnt × 10%”, for example, the communication unit 115 starts EEPROM communication, and when the counter value becomes “cnt × 90%”, for example. The communication unit 115 interrupts the EEPROM communication.

  When the control unit 111 of the microcomputer 11 changes the control command value for controlling the switching of the transistor of the boost converter 51, the switching cycle of the transistor of the boost converter 51 changes. Therefore, the microcomputer 11 performs the above processing from STEP1. Try again.

  FIG. 7 is a flowchart illustrating an example of communication processing of the information processing apparatus according to an embodiment.

  For example, when the IG-SW is turned off by a user operation or the like at time t1 in FIG. 6, the microcomputer 11 starts the process in FIG.

  In step S701, the timing acquisition unit 113 of the microcomputer 11 initializes the count value of the counter.

  In step S702, the voltage drop detection unit 112 of the microcomputer 11 detects, for example, the start time (first time) of the stepped voltage drop pattern in the output voltage of the boost converter 51 at time t2 in FIG.

  In step S703, the timing acquisition unit 113 of the microcomputer 11 counts up the counter until the start time (second time) of the stepped voltage drop pattern is detected in step S704.

  In step S704, for example, when the voltage drop detection unit 112 of the microcomputer 11 detects the start time (second time) of the voltage drop pattern at time t3 in FIG. 6, the microcomputer 11 shifts the processing to step S705.

  In step S705, the timing acquisition unit 113 stores the count value of the counter in the storage unit 116.

  In step S706, the generation period estimation unit 114 of the microcomputer 11 initializes the count value of the counter, and uses the count value “cnt” stored in the storage unit 116 by the timing acquisition unit 113 to estimate the period during which noise occurs ( Or decide). For example, the occurrence period estimation unit 114 calculates the values of “cnt × 10%” and “cnt × 90%” described above.

  In step S707, when the counter is incremented, in step S708, the microcomputer 11 determines whether or not the control unit 111 has changed the control command value for determining the switching period of the transistor. If the control command value is different from the previous value, the microcomputer 11 returns the process to step S701. On the other hand, when the control command value is the same as the previous value, the microcomputer 11 shifts the process to step S709.

  In step S709, the communication unit 115 of the microcomputer 11 determines whether or not EEPROM communication is permitted. For example, in the example of FIG. 6, communication is permitted from time t4 when the counter value becomes “cnt × 10%” to time t5 when the counter value becomes “cnt × 90%”. Therefore, the communication unit 115 determines that the EEPROM communication is permitted when the current counter value is, for example, “cnt × 10%” or more and less than “cnt × 90%”. On the other hand, the communication unit 115 determines that the EEPROM communication is not permitted when the current counter value is, for example, less than “cnt × 10%” or more than “cnt × 90%”.

  If it is determined that the EEPROM communication is permitted, the communication unit 115 executes the EEPROM communication in step S710. On the other hand, when it is determined that the EEPROM communication is not permitted, the communication unit 115 interrupts the EEPROM communication in step S711.

  In step S712, it is determined whether or not the voltage drop detection unit 112 of the microcomputer 11 has detected the start time of the stepped voltage drop pattern. When a voltage drop of a predetermined pattern is detected, the microcomputer 11 moves the process to step S706. On the other hand, when the voltage drop of the predetermined pattern is not detected, the microcomputer 11 shifts the process to step S707.

  By the above processing, the in-vehicle system 1 executes EEPROM communication in a period excluding a period in which the noise estimated by the generation period estimation unit 114 occurs in the discharge period. Moreover, the vehicle-mounted system 1 interrupts EEPROM communication in the period in which the noise estimated by the generation period estimation unit 114 is generated in the discharge period. Therefore, according to the in-vehicle system 1 according to the present embodiment, the failure of the EEPROM communication due to noise is reduced even when the EEPROM communication is executed during the discharge period.

  As a result, the in-vehicle system 1 according to the present embodiment enables data communication with the nonvolatile memory 12 during the discharge operation of the IPM 50 that is a noise generation source, and reduces the time required for data communication with the nonvolatile memory 12. It can be shortened.

1 In-vehicle system 10 MG-ECU (electronic control unit)
11 Microcomputer
12 Non-volatile memory (storage device)
30 HV battery (battery)
40 MG (rotary motor)
50 IPM (device)
51 Step-up converter 52 Inverter 112 Voltage drop detection unit (detection means)
113 Timing acquisition unit (acquisition means)
114 Generation period estimation unit (estimation means)
115 Communication unit (communication means)

Claims (1)

A device including a boost converter that boosts the voltage of the battery and outputs a boosted output voltage; and an inverter that supplies electric power supplied from the battery via the boost converter to the rotary motor;
An electronic control device including a microcomputer for controlling the device and a storage device for storing data;
In-vehicle system including
The microcomputer is
Detecting means for detecting a start time of the voltage drop pattern in a discharge period in which the step-like voltage drop pattern of the output voltage continues after ignition off;
An acquisition means for acquiring a time from a start time of the voltage drop pattern detected by the detection means to a start time of the next voltage drop pattern;
Estimating means for estimating a period during which noise from the boost converter is generated from the time acquired by the acquiring means;
Data communication with the storage device is performed during a period excluding the period estimated by the estimation unit during the discharge period, and data communication with the storage device is interrupted during the period estimated by the estimation unit during the discharge period. Communication means;
In-vehicle system having

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