JP2023160626A - Control device, vehicle, and control program - Google Patents

Abstract

To provide a control device, a vehicle, and a control program that can prevent a disconnection of an SMR-G from being erroneously detected when the SMR-G freezes.SOLUTION: A control device includes a processor that pre-charges by bringing a first SMR that transmits power from a chargeable and dischargeable battery to a power control unit that controls a motor generator, and a second SMR that transmits power from the power control unit to the battery into an ON state, waits for a predetermined time with the second SMR in the OFF state while turning the first SMR and a third SMR that transmits power from the power control unit to the battery into an ON state, and determines that the third SMR is frozen when the voltage of the power control unit acquired after waiting for the predetermined period of time is lower than the voltage of the power control unit acquired at the start of waiting.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a control device, a vehicle, and a control program.

Patent Document 1 describes a vehicle control device that transmits power from a battery to a PCU (Power Control Unit) via an SMR (System Main Relay). Further, a configuration including a plurality of SMRs such as SMR-B (positive side relay), SMR-G (negative side relay), and SMR-P (precharge relay) is known.

JP2017-153220A

When SMR-B and SMR-P are turned ON to perform precharging, and then SMR-G is turned ON to bring the vehicle into the Ready ON state, when the outside temperature is extremely low and SMR-G is If it was frozen, there were cases where a disconnection of the SMR-G was incorrectly detected.

The present disclosure has been made in view of the above, and provides a control device, a vehicle, and a control program that can prevent disconnection of the SMR-G from being erroneously detected when the SMR-G freezes. The purpose is to provide.

The control device according to the present disclosure turns on a first SMR that transmits power from a chargeable/dischargeable battery to a power control unit that controls a motor generator, and a second SMR that transmits power from the power control unit to the battery. Precharge as a state, turn on the first SMR and a third SMR that transmits power from the power control unit to the battery, and wait for a predetermined time with the second SMR in an OFF state, and acquire after waiting for the predetermined time. The apparatus includes a processor configured to determine that the third SMR is frozen if the voltage of the power control unit acquired at the time of starting standby is lower than the voltage of the power control unit acquired at the start of standby.

A vehicle according to the present disclosure includes a motor generator, a power control unit that controls the motor generator, a chargeable and dischargeable battery, a first SMR that transmits power from the battery to the power control unit, and a power control unit that controls the motor generator. a second SMR and a third SMR that transmit power from the battery to the battery; a voltage acquisition unit that acquires the voltage in the power control unit; When the third SMR is in the ON state and the second SMR is in the OFF state and is on standby for a predetermined period of time, and the voltage of the power control unit obtained after the predetermined period of standby is lower than the voltage of the power control unit obtained at the start of standby, the a processor configured to determine that the third SMR is frozen.

A control program according to the present disclosure includes a first SMR that transmits power from a chargeable/dischargeable battery to a power control unit that controls a motor generator, and a first SMR that transmits power from the power control unit to the battery. 2SMR is precharged in an ON state, and while the first SMR and a third SMR that transmits power from the power control unit to the battery are in an ON state, the second SMR is set in an OFF state and stands by for a predetermined period of time; If the voltage of the power control unit acquired after standby is lower than the voltage of the power control unit acquired at the start of standby, determining that the third SMR is frozen is performed.

According to the present disclosure, when the SMR-G freezes, it is possible to prevent a disconnection of the SMR-G from being erroneously detected.

FIG. 1 is a configuration diagram of a vehicle including a control device according to an embodiment. FIG. 2 is a flowchart showing processing executed by the control device according to the embodiment. FIG. 3 is a timing chart showing processing executed by the control device according to the embodiment.

A control device, a vehicle, and a control program according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

(Embodiment)
FIG. 1 is a configuration diagram of a vehicle including a control device according to an embodiment. The control device according to the embodiment is a battery such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV). vehicle equipped with 1 applies.

The vehicle 1 includes a battery 11, an SMR (System Main Relay) 12, a DCDC converter 13, an auxiliary machine 14, a PCU (Power Control Unit) 15 as a power control unit, and a motor generator (MG). 16 and 17, voltage sensors 21 to 23 as voltage acquisition units, and an ECU (Electronic Control Unit) 30 as a processor.

The battery 11 is a storage battery that can be charged and discharged as a high voltage battery. As the battery 11, for example, a lithium ion assembled battery, a nickel hydride assembled battery, a nickel cadmium battery, a lead acid battery, etc. can be used.

The SMR 12 includes an SMR-B 121 as a first SMR, an SMR-P 122 as a second SMR, an SMR-G 123 as a third SMR, a reactor R1, and the like. Note that "B" in SMR-B 121 means that it is connected to the positive electrode side of battery 11. The "P" in SMR-P122 means that it is used for precharging. The “G” in SMR-G123 means that it is connected to the negative electrode side of the battery 11.

The SMR-B 121 is connected to the positive electrode side of the battery 11 and transmits power from the battery 11 to the PCU 15. The SMR-B 121 switches between an ON state and an OFF state by receiving a control signal from the ECU 30.

SMR-P 122 and reactor R 1 are connected in parallel with SMR-G 123 and transmit power from PCU 15 to battery 11 . SMR-P122 and reactor R1 are connected in series. The SMR-P 122 switches between an ON state and an OFF state by receiving a control signal from the ECU 30. Reactor R1 is used to suppress inrush current from flowing when connecting battery 11 to PCU 15.

The SMR-G 123 is connected to the negative electrode side of the battery 11 and transmits power from the PCU 15 to the battery 11. The SMR-G 123 switches between an ON state and an OFF state by receiving a control signal from the ECU 30.

By switching the SMR-B 121 and SMR-G 123 from the OFF state to the ON state, the battery 11 and the PCU 15 are connected, the MGs 16 and 17 are started to be driven, and the vehicle 1 can be brought into the Ready ON state in which it can run. . At this time, a rush current flows from the battery 11 to the smoothing capacitor C1 of the PCU 15. Therefore, before turning on the SMR-B 121 and SMR-G 123, the SMR-B 121 and SMR-P 122 are turned on, and the smoothing capacitor C1 is precharged using the power output from the auxiliary machine 14.

DCDC converter 13 steps down the voltage of battery 11 and transmits the power to auxiliary equipment 14 .

The auxiliary equipment 14 is a load that consumes power in the vehicle 1 for purposes other than driving, such as the power consumption of the vehicle 1's air conditioner (air conditioner inverter, motor, etc.), AV equipment, interior lighting equipment, headlights, etc. It is a device. Further, the auxiliary device 14 includes a secondary battery such as a lead-acid battery or a nickel-metal hydride battery, and can precharge the smoothing capacitor C1.

The PCU 15 includes a smoothing capacitor C1, a booster circuit 151, a resistor R2, a smoothing capacitor C2, inverters 152 and 153, and the like.

The smoothing capacitor C1 is provided as a capacitor that smoothes the voltage between the battery 11 and the booster circuit 151.

The boost circuit 151 boosts the output voltage of the battery 11 and outputs the boosted power to the inverters 152 and 153, or steps down the output voltage of the inverters 152 and 153 and outputs the stepped-down power to the battery 11. can do.

Smoothing capacitor C2 is provided as a capacitor that smoothes the voltage between booster circuit 151 and inverters 152 and 153.

Inverters 152 and 153 convert DC power from battery 11 into AC power and supply it to MGs 16 and 17. The inverters 152 and 153 are constituted by inverter circuits including a plurality of switching elements so that three-phase currents can be applied to the three-phase coils of the MGs 16 and 17, respectively. An inverter circuit is an electric circuit that converts DC power into AC power by switching each switching element for each phase (U phase, V phase, W phase). Inverters 152 and 153 each have six switching elements and six diodes. The switching elements are arranged in pairs, one on the source side and the other on the sink side with respect to the positive and negative bus lines of the PN line. The diodes are connected in parallel in opposite directions to their corresponding switching elements. Further, in the inverters 152 and 153, each of the three-phase coils of the MGs 16 and 17 is connected to each connection point between the pair of switching elements.

The MGs 16 and 17 are connected to a drive shaft and are rotationally driven by the PCU 15 to generate running driving force. Further, the MGs 16 and 17 generate electricity using the rotational force received from the drive shaft when braking the vehicle. The power generated by the MGs 16 and 17 is converted into DC power by the PCU 15 and charged into the battery 11. The MGs 16 and 17 are configured, for example, by three-phase AC synchronous motors in which permanent magnets are provided in the rotor.

Voltage sensor 21 detects voltage VB of battery 11 and outputs voltage VB as a detection result to ECU 30.

Voltage sensor 22 detects voltage VL of smoothing capacitor C1, and outputs voltage VL as a detection result to ECU 30.

Voltage sensor 23 detects voltage VH of smoothing capacitor C2, and outputs voltage VH as a detection result to ECU 30.

Specifically, the ECU 30 includes a processor including a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), and a RAM (Random). Access Memory), ROM (Read Only Memory), etc. It has a memory (main memory) consisting of:

The ECU 30 manages the state of the battery 11 by calculating the SOC (State of Charge) and full charge capacity of the battery 11 based on the detected values from the voltage sensors 21 to 23, and also controls the charging/discharging operation of the battery 11 and the SMR 12. It performs operations for switching between ON and OFF states, drive control of the booster circuit 151, and drive control of the inverters 152 and 153.

Further, the ECU 30 determines whether precharging is completed based on the voltage VL of the PCU 15 acquired by the voltage sensor 22.

In addition, the ECU 30 turns on SMR-B121 and SMR-G123, turns SMR-P122 off, and if SMR-B121 or SMR-G123 is not excited, the ECU 30 determines that the connection of SMR-B121 or SMR-G123 is abnormal. judge.

Further, the ECU 30 precharges the smoothing capacitor C1 as the SMR-B121 and SMR-P122, turns on the SMR-B121 and SMR-G123, turns off the SMR-P122, and waits for a predetermined time, and after waiting for the predetermined time. If the voltage VL or VH of the PCU 15 acquired by the voltage sensor 22 or 23 is lower than the voltage VL or VH of the PCU 15 acquired by the voltage sensor 22 or 23 at the start of standby, and it is determined that the voltage VL or VH of the PCU 15 has decreased, the SMR - It is determined that G123 is frozen. On the other hand, the ECU 30 determines that the difference between the voltage VL or VH of the PCU 15 acquired by the voltage sensor 22 or 23 after waiting for a predetermined period of time and the voltage VL or VH of the PCU 15 acquired by the voltage sensor 22 or 23 at the start of standby is less than or equal to the threshold, If it is determined that the voltage VL or VH of the PCU 15 has not decreased, the MGs 16 and 17 are brought into a Ready ON state in which driving can be started.

Note that the ECU 30 may determine that the SMR-G 123 is frozen when either the voltage VL or the voltage VH of the PCU 15 decreases. In other words, the ECU 30 may acquire the voltages at a plurality of locations in the PCU 15, and determine that the SMR-G 123 is frozen if the voltage decreases at any of the locations. Furthermore, the ECU 30 may determine whether the SMR-G 123 is frozen by comparing the voltage VB of the battery 11 with the voltage VL or voltage VH of the PCU 15.

Next, the processing executed by the ECU 30 will be explained. FIG. 2 is a flowchart showing processing executed by the control device according to the embodiment. FIG. 3 is a timing chart showing processing executed by the control device according to the embodiment.

First, at time T=T1 shown in FIG. 3, when the user presses the ignition switch of the vehicle ₁ , a predetermined IG signal is transmitted and the IG-ON state is established. Then, at time T= _T2 , the ECU 30 transmits an ST signal to turn on the SMR-B 121 (step S1).

Further, the ECU 30 turns on the SMR-P 122 at time T=T ₃ (step S2).

After that, the ECU 30 determines whether precharging is completed based on the voltage VL of the PCU 15 acquired by the voltage sensor 22 (step S3).

If the ECU 30 determines that the precharge is completed (step S3: Yes), the ECU 30 turns on the SMR-G 123 at time T= _T4 (step S4).

Furthermore, at time T= _T5 , the ECU 30 turns the SMR-P 122 into an OFF state (step S5).

Then, the ECU 30 determines whether or not the SMR-B 121 and the SMR-G 123 are excited (step S6).

When the ECU 30 determines that the SMR-B 121 and the SMR-G 123 are excited (step S6: Yes), the ECU 30 waits for a certain period of time from time T=T ₅ to T ₆ (step S7).

At time T= _T6 after waiting for a certain period of time, the ECU 30 determines whether or not the voltage VL of the PCU 15 acquired by the voltage sensor 22 has decreased (step S8).

If the ECU 30 determines that there is no decrease in the voltage VL (step S8: Yes), at time T= _T6 , the ECU 30 puts the MGs 16 and 17 into a Ready ON state in which driving can be started. As shown by line _L1 in FIG. 3, when SMR-G123 is not frozen, SMR-B121 and SMR-G123 are in the ON state, and battery 11 and PCU 15 are normally connected, the voltage VL of PCU 15 is does not decrease. At this time, the ECU 30 shifts the vehicle 1 to the Ready ON state (step S9).

In step S3, if the ECU 30 determines that the precharge is not completed (step S3: No), the ECU 30 determines that the precharge is abnormal (step S10).

In step S6, if the ECU 30 determines that there is no excitation of the SMR-B121 or SMR-G123 (step S6: No), the ECU 30 determines that there is a wiring abnormality indicating a component failure such as disconnection of the SMR-B121 or SMR-G123. Determination is made (step S11).

In step S8, if the ECU 30 determines that the voltage VL has decreased (step S8: No), the ECU 30 determines that the SMR-G 123 is frozen (step S12). As shown by line _L2 in FIG. 3, when the SMR-G 123 is frozen, the voltage VL of the PCU 15 decreases. At this time, the ECU 30 determines that the SMR-G 123 is frozen.

According to the embodiment described above, after precharging, SMR-B121 and SMR-G123 are turned on, SMR-P122 is turned off, and a predetermined period of standby is performed, and when the voltage VL of PCU 15 decreases, SMR-G123 is turned on. Since it is determined that the SMR-G 123 is frozen, it is possible to prevent a disconnection of the SMR-G 123 from being erroneously detected when the SMR-G 123 is frozen. As a result, it is possible to prevent erroneous replacement of parts due to erroneous detection of disconnection of the SMR-G 123. Further, when the SMR-G 123 is frozen, it can be confirmed that the SMR-G 123 is frozen, and the vehicle 1 is not in a driveable state, so safety is maintained.

Further advantages and modifications can be easily deduced by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1 Vehicle 11 Battery 12 SMR
13 DCDC converter 14 Auxiliary equipment 15 PCU
16, 17 MG
21, 22, 23 Voltage sensor 30 ECU
121 SMR-B
122 SMR-P
123 SMR-G
151 Boost circuit 152, 153 Inverter

Claims (8)

A first SMR that transmits power from a chargeable/dischargeable battery to a power control unit that controls a motor generator, and a second SMR that transmits power from the power control unit to the battery are turned on and precharged,
waiting for a predetermined period of time with the second SMR in the OFF state while the first SMR and the third SMR that transmits power from the power control unit to the battery are in the ON state;
A control device comprising: a processor configured to determine that the third SMR is frozen if the voltage of the power control unit acquired after waiting for the predetermined period of time is lower than the voltage of the power control unit acquired at the start of standby. . The processor includes:
Claim 1: When a difference between the voltage of the power control unit acquired after waiting for the predetermined period of time and the voltage of the power control unit acquired at the start of standby is less than or equal to a threshold value, driving of the motor generator can be started. The control device described in . The processor includes:
The control device according to claim 1, wherein voltages at a plurality of locations in the power control unit are acquired, and when the voltage decreases at any of the locations, it is determined that the third SMR is frozen. The processor includes:
The control device according to claim 1, wherein the control device determines whether or not the third SMR is frozen by comparing the voltage of the battery and the voltage of the power control unit. The processor includes:
The control device according to claim 1, wherein it is determined whether the precharging is completed based on the voltage of the power control section. The processor includes:
Claim 1: When the first SMR and the third SMR are turned on, the second SMR is turned off, and the first SMR or the third SMR is not excited, it is determined that the first SMR or the third SMR has a connection abnormality. The control device described in . a motor generator;
a power control unit that controls the motor generator;
A chargeable and dischargeable battery,
a first SMR that transmits power from the battery to the power control unit;
a second SMR and a third SMR that transmit power from the power control unit to the battery;
a voltage acquisition unit that acquires the voltage in the power control unit;
The first SMR and the second SMR are precharged in an ON state, the first SMR and the third SMR are in an ON state, and the second SMR is kept in an OFF state and waited for a predetermined time, and the power control is obtained after waiting for the predetermined time. a processor configured to determine that the third SMR is frozen if the voltage of the third SMR is lower than the voltage of the power control unit acquired at the start of standby;
A vehicle equipped with to the processor,
A first SMR that transmits power from a chargeable/dischargeable battery to a power control unit that controls a motor generator, and a second SMR that transmits power from the power control unit to the battery are turned on and precharged;
waiting for a predetermined time with the second SMR in the OFF state while the first SMR and the third SMR that transmits power from the power control unit to the battery are in the ON state;
If the voltage of the power control unit acquired after waiting for the predetermined period of time is lower than the voltage of the power control unit acquired at the start of standby, it is determined that the third SMR is frozen. A control program that causes the third SMR to determine that it is frozen.

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