JP6256231B2 - Hybrid vehicle - Google Patents

Description

  The present invention provides a vehicle equipped with an engine, a rotating electrical machine that is mechanically coupled to the engine, and a power storage device, in which an abnormality in a stop function of an electrical device provided in an electrical circuit between the rotating electrical machine and the power storage device is detected. The present invention relates to a technique for determining presence or absence.

  Japanese Patent Application Laid-Open No. 2010-288318 (Patent Document 1) executes a stop process in which when a stop of a vehicle system is instructed, the electric charge remaining in the capacitor is discharged and finally the system main relay and the inverter are shut off. In addition, a technique for determining whether or not there is an abnormality in the stop function of the electrical device to be stopped is disclosed.

JP 2010-288318 A

  However, in a hybrid vehicle in which the motor generator and the engine are mechanically connected, the output shaft may rotate due to the pressure in the cylinder of the engine after an instruction to stop the vehicle system is given. A counter electromotive force is generated in the motor generator as the output shaft of the engine rotates. As a result, it may not be possible to determine whether or not the stop function is abnormal at an appropriate timing.

  The present invention has been made in order to solve the above-described problems, and its purpose is to determine whether or not there is an abnormality in an electrical device to be subjected to stop processing after an instruction to stop the vehicle system is given. It is to provide a hybrid vehicle for judging.

  A hybrid vehicle according to an aspect of the present invention receives an engine, a rotating electrical machine mechanically coupled to the engine, a power storage device that transfers power between the rotating electrical machine, and an instruction to stop the vehicle system And a control device for executing a determination process for determining whether or not the stop process of the electric circuit provided between the power storage device and the rotating electrical machine has been normally performed. The control device delays the execution of the next determination process from the execution of the canceled determination process when the determination process is stopped due to rotation of the output shaft of the engine after receiving the stop instruction.

  In this way, even if rotation fluctuation of the output shaft of the engine occurs after receiving the stop instruction, the determination process is executed at the timing when the generation of the rotation fluctuation ends by delaying the execution of the next determination process. Can do. Therefore, the determination process can be normally completed without being affected by the fluctuation of the rotation of the output shaft of the engine.

  Preferably, when the next determination process is normally completed, the control device returns the execution of the delayed determination process to the state before the delay.

  If it does in this way, it can control that a state with a long time after receiving an instruction to stop a system of a vehicle until a judgment process is completed continues.

  More preferably, the control device delays execution of the next determination process by a predetermined time from execution of the canceled determination process. The predetermined time is after the time point when the rotation speed of the rotating electrical machine becomes smaller than a predetermined value when the output shaft of the engine rotates after receiving a stop instruction. Is set to be

  In this way, even if the rotation fluctuation of the output shaft of the engine occurs after receiving the stop instruction, the determination process can be executed at the timing when the generation of the rotation fluctuation ends. Therefore, the determination process can be normally completed without being affected by the rotation fluctuation of the output shaft of the engine.

  More preferably, the control device cancels the determination process when a predetermined condition including a condition that the magnitude of the rotational speed of the rotating electrical machine is larger than a predetermined value is satisfied during execution of the determination process. To do.

  In this case, since the magnitude of the rotation speed of the output shaft of the engine is larger than a predetermined value, a counter electromotive force is generated in the rotating electrical machine, and the determination process cannot be performed with high accuracy. An erroneous determination can be prevented by stopping the processing.

  According to the present invention, even if a rotation fluctuation of the output shaft of the engine occurs after receiving a stop instruction, the determination process is executed at a timing when the generation of the rotation fluctuation ends by delaying the execution of the next determination process. Can do. Therefore, the determination process can be normally completed without being affected by the fluctuation of the rotation of the output shaft of the engine. Therefore, it is possible to provide a hybrid vehicle that determines, at an appropriate timing, whether or not there is an abnormality in the electrical device that is the target of execution of the stop process after an instruction to shut off the vehicle system is given.

1 is an overall block diagram showing a configuration of a vehicle according to an embodiment. It is a figure for demonstrating the content of the determination process. It is a functional block diagram of ECU mounted in the vehicle which concerns on this Embodiment. It is a flowchart which shows the control processing performed with ECU mounted in the vehicle which concerns on this Embodiment. It is a timing chart which shows operation | movement of ECU mounted in the vehicle which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is an overall block diagram of a hybrid vehicle (hereinafter simply referred to as a vehicle) 100 according to the present embodiment. In the present embodiment, an example in which vehicle 100 includes two inverters and a motor generator corresponding to the two inverters will be described. However, even when one inverter and motor generator are included, three or more inverters and motor generators are included. Even if applicable.

  Referring to FIG. 1, vehicle 100 includes a power storage device 150, a PCU (Power Control Unit) 200, motor generators MG1 and MG2, a power split mechanism 250, an engine 220, drive wheels 260, and a system main relay. (Hereinafter referred to as SMR) 190, current sensors 230 and 240, rotation angle sensors 270 and 280, and an HV-ECU (Electronic Control Unit) 350 are provided.

  The power storage device 150 is a power storage element configured to be chargeable / dischargeable. The power storage device 150 includes, for example, a secondary battery such as a lithium ion battery, a nickel hydride battery, or a lead storage battery, and a power storage element such as an electric double layer capacitor.

  Power storage device 150 is connected to PCU 200 via power supply line PL1 and ground line NL1 via SMR 190. Power storage device 150 supplies DCU to PCU 200 for driving motor generators MG1 and MG2. Power storage device 150 stores the electric power generated by motor generators MG1 and MG2 supplied via PCU 200.

  SMR 190 includes a relay SMRB, a relay SMRP, and a relay SMRG. Relay SMRB is provided on power supply line PL1. Relay SMRG and relay SMRP are connected in parallel and provided on ground line NL1. SMR 190 is controlled by HV-ECU 350 and switches between power supply and cutoff from power storage device 150 to PCU 200.

  PCU 200 converts the DC power from power storage device 150 into AC power for driving motor generators MG1, MG2. PCU 200 converts AC power generated by motor generators MG 1 and MG 2 into DC power for charging power storage device 150.

  Motor generators MG1 and MG2 receive AC power supplied from PCU 200 and generate a driving force for the vehicle. Motor generators MG 1, MG 2 receive rotational force from the outside, generate AC power according to a regenerative torque command from MG-ECU 300, and generate regenerative braking force in vehicle 100.

  Motor generators MG 1 and MG 2 are also coupled to engine 220 via power split mechanism 250. Then, the driving force generated by engine 220 and the driving force generated by motor generators MG1, MG2 are controlled to have an optimal ratio. Alternatively, either one of motor generators MG1 and MG2 may function exclusively as an electric motor, and the other motor generator may function exclusively as a generator. In the present embodiment, motor generator MG1 functions exclusively as a generator driven by engine 220, and motor generator MG2 functions exclusively as an electric motor that drives drive wheels 260.

  Power split mechanism 250 is configured to include a planetary gear mechanism (planetary gear) in order to distribute the power of engine 220 to both drive wheel 260 and motor generator MG1.

  Current sensors 230 and 240 detect motor currents (that is, inverter output currents) MCRT1 and MCRT2 flowing in motor generators MG1 and MG2, respectively, and output the detected motor currents to MG-ECU 300 and HV-ECU 350. Since the sum of the instantaneous values of the currents iu, iv, and iw of the U, V, and W phases is zero, the current sensors 230 and 240 are motor currents for two phases of the U, V, and W phases (for example, , V-phase current iv and W-phase current iw) are only required to be detected.

  Rotation angle sensors (for example, resolvers) 270 and 280 detect rotation angles θ1 and θ2 of motor generators MG1 and MG2, respectively, and send the detected rotation angles θ1 and θ2 to MG-ECU 300. MG-ECU 300 can calculate the rotational speed and angular speed of motor generators MG1, MG2 based on rotational angles θ1, θ2. The rotation angle sensors 270 and 280 may be omitted by directly calculating the rotation angles θ1 and θ2 from the motor voltage and current in the MG-ECU 300.

  PCU 200 includes an inverter 120, a converter 130, smoothing capacitors C1 and C2, a resistor R1, voltage sensors 170 and 180, and an MG-ECU 300. Inverter 120 includes an inverter 121 for driving motor generator MG1 and an inverter 122 for driving motor generator MG2.

  Converter 130 is connected in parallel to reactor L1 having one end connected to power supply line PL1, switching elements Q1 and Q2 connected in series between power supply line HPL and ground line NL1, and switching elements Q1 and Q2. Diodes D1 and D2. As the switching element, an IGBT (Insulated Gate Bipolar Transistor), a bipolar transistor, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), or a GTO (Gate Turn Off Thyristor) is typically used. In the present embodiment, a case where an IGBT is used as a switching element will be described as an example.

  Reactor L1 has the other end connected to the emitter of switching element Q1 and the collector of switching element Q2. The cathode of diode D1 is connected to the collector of switching element Q1, and the anode of diode D1 is connected to the emitter of switching element Q1. The cathode of diode D2 is connected to the collector of switching element Q2, and the anode of diode D2 is connected to the emitter of switching element Q2.

  Switching elements Q1, Q2 are controlled to be turned on or off by a control signal PWC from MG-ECU 300.

  Inverter 121 receives the boosted voltage from converter 130, and drives motor generator MG1 to start engine 220, for example. Inverter 121 also outputs regenerative power generated by motor generator MG <b> 1 by mechanical power transmitted from engine 220 to converter 130. At this time, converter 130 is controlled by MG-ECU 300 so as to operate as a step-down circuit.

  Inverter 121 includes a U-phase arm 123, a V-phase arm 124, and a W-phase arm 125. U-phase arm 123, V-phase arm 124, and W-phase arm 125 are connected in parallel between power supply line HPL and ground line NL1.

  U-phase arm 123 includes switching elements Q3 and Q4 connected in series between power supply line HPL and ground line NL1, and diodes D3 and D4 connected in parallel with switching elements Q3 and Q4, respectively. The cathode of diode D3 is connected to the collector of switching element Q3, and the anode of diode D3 is connected to the emitter of switching element Q3. The cathode of diode D4 is connected to the collector of switching element Q4, and the anode of diode D4 is connected to the emitter of switching element Q4.

  V-phase arm 124 includes switching elements Q5 and Q6 connected in series between power supply line HPL and ground line NL1, and diodes D5 and D6 connected in parallel with switching elements Q5 and Q6, respectively. The cathode of diode D5 is connected to the collector of switching element Q5, and the anode of diode D5 is connected to the emitter of switching element Q5. The cathode of diode D6 is connected to the collector of switching element Q6, and the anode of diode D6 is connected to the emitter of switching element Q6.

  W-phase arm 125 includes switching elements Q7 and Q8 connected in series between power supply line HPL and ground line NL1, and diodes D7 and D8 connected in parallel with switching elements Q7 and Q8, respectively. The cathode of diode D7 is connected to the collector of switching element Q7, and the anode of diode D7 is connected to the emitter of switching element Q7. The cathode of diode D8 is connected to the collector of switching element Q8, and the anode of diode D8 is connected to the emitter of switching element Q8.

  Motor generator MG1 is, for example, a three-phase AC motor generator, and includes a rotor having a permanent magnet embedded therein and a stator having a three-phase coil Y-connected at a neutral point. One end of each of three coils (not shown) of U, V, and W phases of motor generator MG1 is connected together to a neutral point. The other end of the U-phase coil is connected to the connection node of switching elements Q3 and Q4. The other end of the V-phase coil is connected to a connection node of switching elements Q5 and Q6. The other end of the W-phase coil is connected to the connection node of switching elements Q7 and Q8.

  Inverter 121 converts DC power supplied from converter 130 into desired AC power by turning on or off switching elements Q3 to Q8 in accordance with control signal PWI1 from MG-ECU 300.

  When inverter 121 receives cutoff command SDN1 from MG-ECU 300, inverter 121 shuts off the gates of switching elements Q3 to Q8 and deactivates switching elements Q3 to Q8. Thus, inverter 121 cuts off the output current to motor generator MG1.

  Inverter 122 is connected to converter 130 in parallel with inverter 121.

  Inverter 122 converts the DC voltage output from converter 130 into three-phase AC and outputs the same to motor generator MG2 driving drive wheel 260. Inverter 122 also outputs regenerative power generated by motor generator MG2 to converter 130 in accordance with regenerative braking. At this time, converter 130 is controlled by MG-ECU 300 to operate as a step-down circuit. Although the internal configuration of inverter 122 is not shown, it is similar to inverter 121, and detailed description will not be repeated.

  Smoothing capacitor C1 is connected between power supply line PL1 and ground line NL1, and absorbs a ripple voltage during switching of switching elements Q1 and Q2. Smoothing capacitor C2 is connected between power supply line HPL and ground line NL1, and absorbs a ripple voltage generated during switching by converter 130 and inverter 120.

  Voltage sensor 170 detects voltage VL across smoothing capacitor C1 and outputs the detected voltage VL to MG-ECU 300 and HV-ECU 350. Voltage sensor 180 detects voltage VH between both ends of smoothing capacitor C2, that is, the output voltage of converter 130 (corresponding to the input voltage of inverter 120), and the detected voltage VH is detected by MG-ECU 300 and HV. -It outputs to ECU350.

  The resistor R1 is connected in parallel with the smoothing capacitor C2 between the power supply line HPL and the ground line NL1. The resistor R1 is a resistor having a relatively high resistance value, and gradually discharges residual charges stored in the smoothing capacitors C1 and C2 after the vehicle travels.

  Although not shown, MG-ECU 300 includes a CPU (Central Processing Unit), a storage device, and an input / output buffer, and controls converter 130 and inverter 120 in PCU 200. Note that these controls are not limited to software processing, and can be constructed and processed by dedicated hardware (electronic circuit).

  MG-ECU 300 receives detection values of motor currents MCRT1 and MCRT2 flowing in motor generators MG1 and MG2 detected by current sensors 230 and 240, respectively. MG-ECU 300 receives detection values of rotation angles θ1 and θ2 of motor generators MG1 and MG2 detected by rotation angle sensors 270 and 280. Further, MG-ECU 300 receives detected values of voltages VL and VH across smoothing capacitors C1 and C2 detected by voltage sensors 170 and 180.

  Further, MG-ECU 300 performs a discharge command DCHG for discharging residual charges stored in smoothing capacitors C1 and C2 by motor generators MG1 and / or MG2, and driving motor generators MG1 and MG2 by inverters 121 and 122. The HV-ECU 350 receives at least one of an emergency shutdown command HSDN for urgently stopping and an MG gate cutoff command SDWN for setting at least one of the inverter 121 and the inverter 122 to a non-driven state. .

  MG-ECU 300 generates control signal PWC for converter 130 based on voltages VL and VH across smoothing capacitors C1 and C2. MG-ECU 300 causes converter 130 to perform a step-up operation or a step-down operation by driving switching elements Q1, Q2 of converter 130 by control signal PWC.

  MG-ECU 300 also detects motor currents MCRT1 and MCRT2 flowing in motor generators MG1 and MG2 detected by current sensors 230 and 240, and rotation angles of motor generators MG1 and MG2 detected by rotation angle sensors 270 and 280, respectively. Based on θ1 and θ2, control signals PWI1 and PWI2 for driving inverters 121 and 122 are generated. MG-ECU 300 converts the DC power supplied from converter 130 into AC power for driving motor generators MG1 and MG2 by driving the switching elements of inverters 121 and 122 by control signals PWI1 and PWI2. To do.

  When MG-ECU 300 receives discharge command DCHG from HV-ECU 350, MG-ECU 300 generates control signals PWI1 and PWI2 so that motor generators MG1 and / or MG2 discharge residual charges stored in smoothing capacitors C1 and C2. And output to the inverters 121 and 122. Specifically, for example, the control signals PWI1 and PWI2 are generated so that only the d-axis current component of the current command after the three-phase / two-phase conversion flows. By doing so, the motor generators MG1 and MG2 do not generate driving force, and the residual charges stored in the smoothing capacitors C1 and C2 by the motor generators MG1 and MG2 can be consumed in a short time.

  When MG-ECU 300 receives emergency shut-off command HSDN from HV-ECU 350, MG-ECU 300 outputs shut-off commands SDN1 and SDN2 for making inverters 121 and 122 non-driven to inverters 121 and 122, respectively.

  When MG-ECU 300 receives from HV-ECU 350 MG gate cutoff command SDWN for bringing at least one of inverter 121 and inverter 122 into a non-driven state, MG-ECU 300 at least one of cutoff command SDN1 and cutoff command SDN2 Is output to the inverter corresponding to the cutoff command among the inverters 121 and 122. The MG gate cutoff command SDWN is a command that can shut off the inverters 121 and 122 individually.

  When MG-ECU 300 detects an abnormality of the driving device in PCU 200, MG-ECU 300 outputs abnormality information FSG to HV-ECU 350.

  Although not shown, HV-ECU 350 includes a CPU, a storage device, and an input / output buffer, and controls each device of vehicle 100. Note that these controls are not limited to software processing, and can be constructed and processed by dedicated hardware (electronic circuit).

  The HV-ECU 350 receives the detected values of the voltages VL and VH across the smoothing capacitors C1 and C2 detected by the voltage sensors 170 and 180. HV-ECU 350 receives the detected values of motor currents MCRT1 and MCRT2 flowing in motor generators MG1 and MG2 detected by current sensors 230 and 240, respectively. Further, the HV-ECU 350 receives an ignition signal IG-OFF indicating that the ignition is turned off by operating a start switch (not shown) by the driver. In the present embodiment, receiving the ignition signal IG-OFF corresponds to receiving an instruction to stop the system of the vehicle 100.

  Further, HV-ECU 350 outputs an emergency cutoff command HSDN to MG-ECU 300 in response to abnormality information FSG from MG-ECU 300.

  The HV-ECU 350 generates a relay control signal SE based on the ignition signal IG-OFF or the like. Then, HV-ECU 350 controls relay SMRB, relay SMRP, and relay SMRG of system main relay 190 by this relay control signal SE. Specifically, when relay control signal SE is set to ON, after the contact between relay SMRB and relay SMRP is closed, the contact of relay SMRG is closed and the contact of relay SMRP is opened. Thereby, electric power is supplied from power storage device 150 to PCU 200.

  On the other hand, when relay control signal SE is set to OFF, the contact of relay SMRG is opened after the contact of relay SMRG is opened. Thereby, power supply from power storage device 150 to PCU 200 is interrupted.

  When the ignition signal IG-OFF is input, the HV-ECU 350 sets the relay control signal SE to OFF and controls to open the contacts of the relays SMRB and SMRG.

  In the configuration as described above, the HV-ECU 350 is stored in the smoothing capacitors C1 and C2 before finally shutting off the inverters 121 and 122 and the SMR 190 when, for example, the ignition signal IG-OFF is input. A discharge command DCHG for discharging the remaining charge in a short time is output to MG-ECU 300. As described above, MG-ECU 300 controls inverters 121 and 122 by generating control signals PWI1 and PWI2 that discharge the residual charges stored in smoothing capacitors C1 and C2 in accordance with discharge command DCHG.

  Furthermore, the HV-ECU 350 uses the period during which the discharge command DCHG is output after the relay SMRG is turned off, for example, when the ignition signal IG-OFF is input, and thus the inverters 121 and 122 to be finally shut off. And a determination process for determining whether or not the stop function of the SMR 190 is abnormal (whether it can be normally shut off or not welded).

  The determination process includes, for example, an SDWN check process, an HSDN check process, an SMRG welding check process, and an SMRB welding check process. In addition, as a determination process, the process mentioned above is an example and is not limited to performing the process mentioned above. For example, the determination process may be executed by any one of the SDWN check process, the HSDN check process, the SMRG welding check process, and the SMRB welding check process, or a predetermined combination. Processing may be added.

  For example, as shown in FIG. 2, when the ignition signal IG-OFF is input at time T (0), the HV-ECU 350 turns off the relay SMRG at time T (1) and then at time T (0). (2) Thereafter, the determination process is executed in the order of the SDWN check process, the HSDN process, the SMRG welding check process, and the SMRB welding check process.

  HV-ECU 350 executes the SDWN check process at time T (2). The SDWN check process is a process in which the HV-ECU 350 outputs the MG gate cutoff command SDWN and the discharge command DCHG to the MGECU 300 in parallel, and monitors the change in the VL voltage until a predetermined period elapses. MG gate cutoff command SDWN includes a command for setting both inverters 121 and 122 to a non-driven state. When receiving the MG gate cutoff command SDWN and the discharge command DCHG in parallel, the MG-ECU 300 preferentially executes the MG gate cutoff command SDWN. Therefore, MG-ECU 300 outputs cutoff commands SDN1 and SDN2 to inverters 121 and 122, respectively.

  When the gates of inverters 121 and 122 are appropriately cut off, relay SMRG is in an off state, so that the VL voltage is maintained during the SDWN check process. Therefore, as shown by the solid line in FIG. 2, when the VL voltage is maintained during the SDWN check process, the HV-ECU 350 determines that the gate cutoff based on the MG gate cutoff command SDWN is appropriately performed. judge. On the other hand, in the SDWN check process, as shown by the broken line in FIG. 2, when the VL voltage decreases after time T (2), the HV-ECU 350 appropriately performs gate cutoff based on the MG gate cutoff command SDWN. Judge that it is not.

  The HV-ECU 350 executes the HSDN check process at time T (3). The HSDN check process is a process for monitoring the change in the VL voltage until a predetermined period elapses by outputting the emergency cutoff command HSDN and the discharge command DCHG command in parallel to the HV-ECU 350. When receiving the emergency cutoff command HSDN and the discharge command DCHG in parallel, the MG-ECU 300 preferentially executes the emergency cutoff command HSDN. Therefore, MG-ECU 300 outputs cutoff commands SDN1 and SDN2 to inverters 121 and 122, respectively.

  When the gates in inverters 121 and 122 are appropriately cut off, relay SMRG is in an off state, so that the VL voltage is maintained during the HSDN check process. Therefore, as shown by the solid line in FIG. 2, when the VL voltage is maintained during the HSDN check process, the HV-ECU 350 determines that the gate cutoff based on the emergency cutoff command HSDN is properly performed. To do. On the other hand, in the HSDN check process, as shown by the broken line in FIG. 2, when the VL voltage decreases after time T (3), the HV-ECU 350 appropriately performs gate cutoff based on the emergency cutoff command HSDN. Judge that it is not.

  The HV-ECU 350 executes the SMRG welding check process at time T (4). The SMRG welding check process is a process of monitoring the change in the VL voltage until the discharge command DCHG is output and the predetermined period elapses or until the VL voltage becomes equal to or lower than the threshold value. MG-ECU 300 outputs control signals PWI1 and PWI2 to inverters 121 and 122 based on the discharge command DCHG command, and consumes residual charges in smoothing capacitors C1 and C2 by motor generators MG1 and MG2. When the relay SMRG is not welded, the smoothing capacitors C1 and C2 are appropriately discharged, and therefore decrease with time. Therefore, HV-ECU 350 determines that relay SMRG is not welded when the VL voltage decreases after time T (4) as shown by the solid line in FIG.

  On the other hand, when relay SMRG is welded, SMR 190 is turned on, so that the VL voltage is maintained. Therefore, HV-ECU 350 determines that relay SMRG is welded when the VL voltage is maintained after time T (4) as shown by the broken line in FIG.

  HV-ECU 350 stops outputting discharge command DCHG at time T (5), turns relay SMRB off at time T (6), and then checks SMRB welding at time T (7). Execute the process. The SMRB welding check process is a process in which only the relay SMRP is turned on and a change in the VL voltage is monitored until a predetermined period elapses.

  When relay SMRB is not welded, the VL voltage is maintained in a lowered state, so HV-ECU 350 maintains the VL voltage after time T (7) as shown by the solid line in FIG. In the case, it is determined that the relay SMRG is not welded. On the other hand, when relay SMRB is welded, the VL voltage increases. Therefore, HV-ECU 350, when the VL voltage increases after time T (7), as shown by the broken line in FIG. It is determined that relay SMRB is welded.

  The HV-ECU 350 executes the determination process after a predetermined first time Δt1 has elapsed since the ignition signal IG-OFF was input. The HV-ECU 350 turns off the relay SMRG from when the ignition signal IG-OFF is input until the first time Δt1 elapses.

  However, in vehicle 100 in which motor generator MG1 and engine 220 are mechanically coupled, the output shaft may rotate due to the pressure in the cylinder of engine 220 after an instruction to stop the system of vehicle 100 is given. . As the output shaft of engine 220 rotates, counter electromotive force is generated in motor generator MG1. As a result, the VL voltage may fluctuate, and the determination process is stopped to prevent erroneous determination. For this reason, it may be impossible to determine whether the stop function is abnormal at an appropriate timing.

  Therefore, in the present embodiment, when the HV-ECU 350 stops the determination process due to the output shaft of the engine 220 rotating after receiving an instruction to stop the system of the vehicle 100, the next determination process is executed. Is delayed from execution of the canceled determination process.

  In this way, even if the rotation fluctuation of the output shaft of the engine 220 occurs after receiving the stop instruction, the determination process is executed at the timing when the generation of the rotation fluctuation ends by delaying the execution of the next determination process. be able to. Therefore, the determination process can be normally completed without being affected by the rotational fluctuation of the output shaft of the engine 220.

  FIG. 3 shows a functional block diagram of HV-ECU 350 mounted on vehicle 100 according to the present embodiment. HV-ECU 350 includes an IG-OFF determination unit 102, an incomplete flag determination unit 104, a standby processing unit 106, a determination processing unit 108, an unconditional determination unit 110, and a normal completion determination unit 112. In addition, these structures may be implement | achieved by software, such as a program, and may be implement | achieved by hardware.

  The IG-OFF determination unit 102 determines whether or not the ignition signal IG-OFF is input. For example, when the ignition signal IG-OFF is input, the IG-OFF determination unit 102 may turn on the IG-OFF determination flag.

  The incomplete flag determination unit 104 determines whether or not an incomplete flag indicating that the determination process at the previous IG-OFF was stopped without being completed normally is in an on state. The incomplete flag is turned on when the normal completion determination unit 112, which will be described later, determines that the determination process has not been completed normally, and is turned off when it is determined that the determination process has been completed normally. Put into state.

  The standby processing unit 106 executes standby processing when the incomplete flag determination unit 104 determines that the incomplete flag is on. The standby process is a process of waiting for the start of the determination process until a predetermined second time Δt2 elapses when the first time Δt1 elapses after the ignition signal IG-OFF is input. In the second time, for example, even if the output shaft of the engine 220 rotates after receiving a stop instruction by the input of the ignition signal IG-OFF, the execution of the determination process determines the magnitude of the rotational speed of the motor generator MG1 in advance. It is set so as to be after the point of time when it becomes smaller than the given value. The second time is adapted by, for example, experiments.

  When the incomplete flag is in the off state, the determination processing unit 108 executes the determination process when the first time Δt1 has elapsed since the ignition signal IG-OFF was input. Since the specific content of the determination process is as described above, detailed description thereof will not be repeated.

  When the incomplete flag is in the ON state, the determination processing unit 108 executes the standby process when the first time Δt1 has elapsed since the ignition signal IG-OFF was input. The determination process is executed after waiting until Δt2 elapses.

  In addition, the determination processing unit 108 stops the determination process being executed when it is determined that the unconditional condition is satisfied by the unconditional condition determination unit 110 described later. For example, the determination processing unit 108 stops the determination processing when a determination flag (described later) is turned on during execution of the determination processing.

  The unconditional condition determination unit 110 determines whether an unconditional condition that prohibits execution of the determination process is satisfied during execution of the determination process. Impossibility conditions include, for example, a condition that the rotational speed of motor generator MG1 is equal to or higher than a predetermined value during execution of the determination process. For example, improper condition determination unit 110 receives rotation angle θ1 of motor generator MG1 from MG-ECU 300 to calculate the rotation speed of motor generator MG1, and whether the calculated rotation speed is equal to or greater than a predetermined value. May be determined, or the rotational speed of motor generator MG1 calculated in MG-ECU 300 is received, and it is determined whether or not the received rotational speed is equal to or greater than a predetermined value. May be. For example, when the impossible condition is satisfied, the impossible condition determination unit 110 sets the impossible determination flag to an on state.

  The normal completion determination unit 112 determines that the determination process has not been completed normally and sets the uncompleted flag to the on state when the unconditional condition is satisfied during the execution of the determination process. The normal completion determination unit 112 determines that the determination process has been normally completed when the determination process is completed without the inability condition being satisfied, and sets the OFF state when the incomplete flag is on.

  With reference to FIG. 4, a control process executed by HV-ECU 350 mounted on vehicle 100 according to the present embodiment will be described.

  In step (hereinafter referred to as S) 100, HV-ECU 350 determines whether or not ignition signal IG-OFF is input. If it is determined that ignition signal IG-OFF has been input (YES in S100), the process proceeds to S102. If not (NO in S100), this process ends.

  In S102, HV-ECU 350 determines whether or not the incomplete flag is on. If it is determined that the incomplete flag is on (YES in S102), the process proceeds to S104. If not (NO in 102), the process proceeds to S106.

  In S104, HV-ECU 350 performs a standby process. In S106, HV-ECU 350 executes a determination process. Since the standby process and the determination process are as described above, detailed description thereof will not be repeated.

  In S108, HV-ECU 350 determines whether or not an unacceptable condition is satisfied. If the disabling condition is satisfied (YES in S108), the process proceeds to S110. If not (NO in S108), the process proceeds to S114.

  In S110, HV-ECU 350 stops the determination process. In S112, HV-ECU 350 turns on the incomplete flag. In S114, HV-ECU 350 determines whether or not the determination process has been completed. The HV-ECU 350 determines that the determination process is completed when the determination process is stopped or when the last SMRB welding check process is completed. If the determination process is completed (YES in S114), the process proceeds to S116. If not (NO in S114), the process returns to S108.

  In S116, HV-ECU 350 determines whether the determination process has been completed normally. If it is determined that the determination process has been completed normally (YES in S116), the process proceeds to S118. If not (NO in S116), this process ends. In S118, HV-ECU 350 turns off the incomplete flag.

  The operation of HV-ECU 350 mounted on vehicle 100 according to the present embodiment based on the above-described structure and flowchart will be described with reference to FIG.

  For example, assume that ignition signal IG-OFF is input at time T (10) (YES in S100). If the incomplete flag is off (NO in S102), the determination process is executed at time T (11) when the first time Δt1 has elapsed from time T (10) (S106).

  At time T (12), during the determination process, if the condition is not satisfied because the rotational speed of motor generator MG1 exceeds the threshold value (YES in S108), the determination process is stopped. At the same time (S110), the incomplete flag is turned on (S112). Since the completed determination process has not been completed normally (YES in S114, NO in S116), the incomplete flag remains on.

  Thereafter, it is assumed that the system of the vehicle 100 is activated by inputting the ignition signal IG-ON by the driver's operation of the start switch or the like.

  When ignition signal IG-OFF is input again at time T (13) (YES in S100), the incomplete flag is in the on state (YES in S102), so the first from time T (13) The standby process is executed at time T (14) when the time Δt1 has elapsed (S104). The standby process is executed from time T (14) to time T (15) when the second time Δt2 elapses. Even if the output shaft rotates due to the pressure in the cylinder of the engine between time T (14) and time T (15), and the magnitude of the rotational speed of motor generator MG1 becomes larger than the threshold value, the determination process Since it is not being executed, the unconditional condition is not satisfied.

  At time T (15), determination processing is executed (S106). At time T (16), when the determination process is completed (NO in 108) without the failure condition being satisfied (NO in 108), it is determined that the determination process has been completed normally (YES in S114). If YES in S116), the incomplete flag is turned off (S118).

  Since the incomplete flag is turned off, the next determination process is started when the first time Δt1 has elapsed since the ignition signal IG-OFF was input.

  As described above, according to vehicle 100 in accordance with the present embodiment, the determination process is executed at the timing when the rotation fluctuation ends even if the rotation fluctuation of the output shaft of engine 220 occurs after receiving the stop instruction. can do. Therefore, the determination process can be normally completed without being affected by the rotational fluctuation of the output shaft of the engine 220. Therefore, it is possible to provide a hybrid vehicle that determines whether or not there is an abnormality in the electrical device that is the target of the stop process after an instruction to stop the vehicle system is given.

  Further, when the next determination process is normally completed, the incomplete flag is turned off, so that the execution of the determination process delayed by the standby process can be returned to the state before being delayed. Therefore, it can be suppressed that a state in which the time from the reception of the stop instruction of the vehicle system to the completion of the determination process is continued is continued.

  Further, even when the output shaft of engine 220 rotates after input of ignition signal IG-OFF, the execution of the determination process is after the time point when the rotational speed of motor generator MG1 becomes smaller than a predetermined value. Since the second time Δt2 is set so as to satisfy the following condition, even when the engine output shaft rotation fluctuation occurs after receiving the stop instruction, the determination process can be executed at the timing when the rotation fluctuation generation ends. .

  Furthermore, when the predetermined condition including the condition that the magnitude of the rotation speed of motor generator MG1 is larger than the predetermined value is satisfied during execution of the determination process, the determination process is stopped, so that the engine Since the magnitude of the rotational speed of the output shaft 220 is larger than a predetermined value, a counter electromotive force is generated in the motor generator MG1 and the determination process cannot be executed with high accuracy, so the determination process is stopped. Thus, erroneous determination can be prevented.

  A modification will be described below. In the present embodiment, the hybrid vehicle shown in FIG. 1 has been described as an example. However, the present invention is not particularly limited to the configuration of the hybrid vehicle shown in FIG. The hybrid vehicle may have a configuration in which at least the engine 220 and a motor generator for driving or power generation are mechanically coupled.

  In the present embodiment, HV-ECU 350 has been described as an example in which the determination process is executed when ignition signal IG-OFF is input. A determination process may be executed. For example, the HV-ECU 350 may execute the determination process when a Ready-OFF signal is input instead of the ignition signal IG-OFF. Note that “Ready-OFF” means that the vehicle 100 is made in an untravelable state, as in the case where the ignition signal IG-OFF is input. More specifically, when the Ready-OFF signal is input, the SMR 190 is shut off, and at least the operation of equipment related to traveling (for example, the engine and the motor generators MG1, MG2) is stopped. Note that “Ready-OFF” is different from the case where the ignition signal IG-OFF is input in that an auxiliary machine that is not related to traveling such as audio is operable.

  In the present embodiment, in the standby process, HV-ECU 350 waits for execution of the determination process until a predetermined second time Δt2 elapses, and executes the determination process when the second time Δt2 elapses. As described above, for example, in the standby process, execution of the determination process is waited until the magnitude of the rotational speed of the motor generator MG1 becomes smaller than a predetermined value, and the magnitude of the rotational speed is a predetermined value. The determination process may be executed when the value exceeds the predetermined value, or the determination process is waited until a state where the rotational speed of the motor generator MG1 is smaller than a predetermined value continues for a predetermined time. Then, the determination process may be executed when the state continues for a predetermined time. In addition, you may implement combining the above-mentioned modification, all or one part.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 vehicle, 102 IG-OFF determination unit, 104 incomplete flag determination unit, 106 standby processing unit, 108 determination processing unit, 110 unconditional determination unit, 112 normal completion determination unit, 120, 121, 122 inverter, 123, 124, 125 arm, 130 converter, 150 power storage device, 170, 180 voltage sensor, 190 system main relay, 220 engine, 230, 240 current sensor, 250 power split mechanism, 260 drive wheel, 270, 280 rotation angle sensor, 300 MG-ECU 350 HV-ECU.

Claims (4)

Engine,
A rotating electrical machine mechanically coupled to the engine;
A power storage device that exchanges power with the rotating electrical machine;
Was the electric circuit provided between the power storage device and the rotating electrical machine normally stopped when a first time has elapsed since receiving the stop instruction when receiving a stop instruction for a vehicle system? A control device that executes a determination process for determining whether or not,
The control device, the stop instruction when you stop the determination processing by the output shaft of the engine rotates after receiving the next time of the determination processing, the first after receiving the stop instruction A hybrid vehicle that is executed when a second time longer than the time has elapsed . 2. The hybrid vehicle according to claim 1 , wherein, when the next determination process is normally completed, the control apparatus executes the determination process when the first time has elapsed after receiving the stop instruction . The second time is longer than the first time by a predetermined time,
The predetermined time is determined so that when the output shaft of the engine rotates after receiving the stop instruction, the execution of the determination process causes the rotational speed of the rotating electrical machine to be larger than a predetermined value. The hybrid vehicle according to claim 1, wherein the hybrid vehicle is set so as to be after the time point when it becomes smaller.   The control device stops the determination process when a predetermined condition including a condition that a rotational speed of the rotating electrical machine is larger than a predetermined value is satisfied during the determination process. The hybrid vehicle according to any one of claims 1 to 3.

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