WO2019176350A1

WO2019176350A1 - On-vehicle auxiliary machine apparatus

Info

Publication number: WO2019176350A1
Application number: PCT/JP2019/003082
Authority: WO
Inventors: 寿治岡; 酒井　剛志
Original assignee: 株式会社デンソー
Priority date: 2018-03-15
Filing date: 2019-01-30
Publication date: 2019-09-19
Also published as: JP2019161930A

Abstract

An on-vehicle auxiliary machine apparatus (10) is provided with: an electric power storage device (20); auxiliary machines (31, 32) that are supplied with electric power from the electric power storage device; switching parts (41, 42) that adjust the magnitudes of electric power supplied to the respective auxiliary machines by performing opening/closing operations; a switching control unit (131) that controls opening/closing operations of the switching parts; an electric device (60) that performs at least charging operation for the electric power storage device; and a charging control unit (120) that controls the charging state in which charging is performed from the electric device to the electric power storage device. When charging of the electric power storage device is performed, this on-vehicle auxiliary machine apparatus stops operations of the auxiliary machines after notification is provided to the charging control unit at least before the auxiliary machines stop.

Description

In-vehicle auxiliary equipment

Cross-reference of related applications

This application is based on Japanese patent application 2018-047712 filed on March 15, 2018, and claims the benefit of its priority. Which is incorporated herein by reference.

This disclosure relates to in-vehicle auxiliary equipment.

The vehicle is equipped with on-vehicle auxiliary equipment such as an auxiliary air conditioning heater. The in-vehicle auxiliary device includes a power storage device, and operates the auxiliary device by supplying power from the power storage device to an auxiliary device such as a heater. In addition, the magnitude of the electric power supplied from the power storage device to the auxiliary machine is adjusted by an opening / closing operation of a switching unit including a switching element or the like.

For example, in a power storage device such as a lithium ion battery, if a state where the current supplied to the power storage device for charging exceeds a predetermined value is continued for a long time, lithium metal is deposited on the electrode surface of the power storage device. However, it is known that the performance is degraded.

It is preferable to store the electric power generated by regeneration or the like while the vehicle is running in the power storage device as much as possible. For this reason, it is preferable that the current supplied to the power storage device is adjusted to be as large as possible while maintaining the magnitude within a range in which the deposition of lithium metal can be prevented.

The magnitude of the current supplied to the auxiliary machine varies periodically with the switching operation of the switching unit. For this reason, the ripple current accompanying the said fluctuation is superimposed on the current supplied to the power storage device, that is, the charged current. If the current supplied to the power storage device fluctuates and exceeds the upper limit of the range in which lithium metal deposition can be prevented over a long period of time, lithium metal deposition may occur.

Therefore, in the electric vehicle described in Patent Document 1 below, the input power is limited and kept low only when the frequency of the ripple current superimposed on the input current to the power storage device is lower than the predetermined frequency. As a result, the input current is allowed to exceed the upper limit for a short time, while the input current is prevented from exceeding the upper limit for a long time. As a result, it is possible to prevent the deposition of lithium metal while maintaining the input current to the power storage device as large as possible.

Japanese Unexamined Patent Publication No. 2016-181384

For example, when the operation state of an auxiliary machine becomes abnormal, for example, when the temperature of the heater has risen too much, the power supply to the auxiliary machine may be stopped for safety. At this time, if the power storage device has been charged, the magnitude of the current supplied to the power storage device increases as the auxiliary machine stops, and the upper limit of the range in which lithium metal deposition can be prevented. There is a risk of exceeding for a long time. As a result, the performance of the power storage device may be degraded.

This disclosure is intended to provide an in-vehicle auxiliary device that can prevent the performance degradation of the power storage device even when the power supply to the auxiliary device is stopped.

A vehicle-mounted auxiliary device according to the present disclosure includes a power storage device, an auxiliary device that receives power supply from the power storage device, a switching unit that adjusts the magnitude of power supplied to the auxiliary device by opening and closing, A switching control unit that controls an opening / closing operation of the switching unit, an electric device that performs at least a charging operation on the power storage device, and a charging control unit that controls a charging state in which the power storage device is charged from the electric device. The in-vehicle auxiliary device stops the operation of the auxiliary device after notifying the charging control unit at least before stopping the auxiliary device when the power storage device is being charged.

In the on-vehicle auxiliary device having such a configuration, when the power storage device is being charged, at least before the auxiliary device stops, the notification to the charging control unit and the operation of the auxiliary device are stopped. .

When the auxiliary machine stops, the current supplied to the power storage device increases accordingly. However, since the charge suppression unit has received the notification in advance, it is possible to take measures such as reducing the current. Thus, it is possible to prevent a situation in which the increased current becomes too large over a long period of time and deteriorates the power storage device.

According to the present disclosure, there is provided an in-vehicle auxiliary device device that can prevent a performance degradation of the power storage device even when power supply to the auxiliary device is stopped.

FIG. 1 is a diagram showing an overall configuration of an in-vehicle auxiliary device apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a temporal change in the current supplied to the power storage device. FIG. 3 is a diagram illustrating a temporal change in the current supplied to the power storage device. FIG. 4 is a diagram illustrating a temporal change in the current supplied to the power storage device. FIG. 5 is a diagram illustrating a time change of the current supplied to the power storage device. FIG. 6 is a flowchart showing a flow of processing executed by the heater ECU. FIG. 7 is a flowchart showing a flow of processing executed by the heater ECU of the in-vehicle auxiliary device apparatus according to the second embodiment. FIG. 8 is a flowchart showing a flow of processing executed by the heater ECU of the in-vehicle auxiliary device apparatus according to the third embodiment. FIG. 9 is a diagram illustrating a change over time in the current supplied to the power storage device of the in-vehicle auxiliary device according to the fourth embodiment.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

Referring to FIG. 1, the configuration of the in-vehicle auxiliary device 10 according to the first embodiment will be described. The in-vehicle auxiliary device 10 is a device that is mounted on a vehicle (not shown), and that directly or indirectly heats the air by the

heaters

31 and 32 that are auxiliary devices to assist in heating the vehicle interior. It is configured. “Indirectly” in the above means, for example, “via water”. The in-vehicle auxiliary device 10 includes a power storage device 20, a heater device 30, a drive circuit 40, a capacitor 50, an electric device 60, a relay system 70,

detection circuits

81 and 82, a battery ECU 120, and a heater ECU 130. And a host ECU 110.

The power storage device 20 is a device for charging and discharging electric power, and is a lithium ion battery in this embodiment. The power storage device 20 supplies a current to a heater device 30 described later, thereby operating the

heaters

31 and 32. The electric power stored in the power storage device 20 is supplied from an electric device 60 described later. Charging / discharging of the electrical storage device 20 is controlled by a battery ECU 120 described later. Note that “operating the

heaters

31 and 32” means causing the

heaters

31 and 32 to generate heat.

The heater device 30 is a device for heating air by the heat generated by the

heaters

31 and 32. The

heaters

31 and 32 both generate heat when supplied with electric power from the power storage device 20, and correspond to “auxiliaries” of the in-vehicle auxiliary device 10. As the

heaters

31 and 32, for example, those using NiCr or those using PTC can be used. In the present embodiment, the heater device 30 includes two

heaters

31 and 32, but the number of heaters 31 and the like is not particularly limited. The magnitude of the electric power supplied to each of the

heaters

31 and 32 is adjusted by a drive circuit 40 described below. Thereby, the calorific value in the

heaters

31 and 32 is adjusted.

The drive circuit 40 adjusts the magnitude of the electric power supplied to each of the

heaters

31 and 32 as auxiliary machines by opening and closing operations of the

switching elements

41 and 42. In the present embodiment, IGBTs are used as the

switching elements

41 and 42. The switching element 41 is arranged at a position in series with the heater 31 on a path through which current is supplied from the power storage device 20. In addition, the switching element 42 is disposed at a position in series with the heater 32 on a path through which a current is supplied from the power storage device 20.

When the switching element 41 is closed, the heater 31 is supplied with power from the power storage device 20. Further, when the switching element 41 is in an open state, the supply of power to the heater 31 is stopped. Similarly, when the switching element 42 is closed, the heater 32 is supplied with power from the power storage device 20. Further, when the switching element 42 is opened, the supply of power to the heater 32 is stopped.

The drive circuit 40 adjusts the magnitude of the power supplied to the

heaters

31 and 32 by adjusting the duty when the switching

elements

41 and 42 are repeatedly opened and closed. The opening / closing operation of the switching

elements

41 and 42 is controlled by the heater ECU 130.

Such switching elements

41 and 42 correspond to the “switching unit” in the present embodiment.

The capacitor 50 functions as a so-called “smoothing capacitor”. The capacitor 50 is disposed at a position parallel to the heater device 30 and the drive circuit 40.

The electric device 60 is a device for supplying a current to at least the power storage device 20 for charging, that is, for performing a charging operation. In the present embodiment, a motor generator mounted on a vehicle is used as the electric device 60. For this reason, the electric device 60 can perform a discharging operation and a charging operation with respect to the power storage device 20. As shown in FIG. 1, the pair of lines for flowing current from the electric device 60 to the power storage device 20 are connected to positions that are both ends of the capacitor 50. The current supplied from electric device 60 to power storage device 20, that is, the magnitude of the charged current is adjusted by control performed by battery ECU 120.

The relay system 70 is a safety device that switches between opening and closing between the power storage device 20 and the heater device 30. The relay system 70 includes a relay 71 and a relay 73, which are arranged on a current path that connects the power storage device 20 and the heater device 30. In addition, the current path in which the relay 71 is arranged is branched in the middle, and the relay 72 and the resistor 74 are arranged in series on the branched path.

In normal times, the relay system 70 is closed. At this time, the relay 71 and the relay 73 are in a closed state, and the relay 72 is in an open state. When any abnormality occurs in the in-vehicle auxiliary device 10, both the

relays

71 and 73 are switched to the open state. Thereby, the supply of electric power to the heater device 30 is interrupted.

When the relay system 70 is switched from the open state to the closed state, the relay 71 and the relay 73 are first closed while the relay 71 is kept open. Thereafter, the relay 72 is opened, and at the same time, the relay 71 is closed. When such control is performed, first, a current starts to be supplied via the resistor 74, so that a large inrush current is prevented from flowing through the heater device 30.

The detection circuit 81 is a circuit for detecting a current charged or discharged by the power storage device 20, a voltage between terminals of the power storage device 20, a temperature of the power storage device 20, and the like. The detection circuit 81 detects the current value and the like based on signals from various sensors (not shown) provided around the power storage device 20. The current value detected by the detection circuit 81 is acquired by the battery ECU 120. The value of the current supplied and charged to the power storage device 20 is detected by the detection circuit 81 via the low-pass filter 83. Thereby, the influence of noise in the acquisition of the current value is removed.

Further, the detection circuit 81 can also detect the charging rate in the power storage device 20. The detected charging rate is acquired by the battery ECU 120. The above “charge rate” is so-called “SOC”.

The detection circuit 82 is a circuit for detecting the current flowing through the

heaters

31 and 32, the voltage applied to the

heaters

31 and 32, the temperature of the

heaters

31 and 32, and the like. The detection circuit 82 detects the current value and the like based on signals from various sensors (not shown) provided around the

heaters

31 and 32. The current value detected by the detection circuit 82 is acquired by the heater ECU 130.

Battery ECU 120 is a control device for controlling charging / discharging of power storage device 20. Battery ECU 120 controls a state of charge in which power storage device 20 is charged from electric device 60. The battery ECU 120 is configured as a computer system having a CPU, ROM, RAM, and the like. The same applies to the heater ECU 130 and the host ECU 110 described later. As already described, the battery ECU 120 can acquire various types of information on the power storage device 20 detected by the detection circuit 81. “Various information” includes, for example, current values and the like.

The battery ECU 120 can control the electric device 60 and charge the electric storage device 20 with the electric current from the electric device 60 even when the heater 31 generates heat by the electric power from the electric storage device 20. Such a battery ECU 120 corresponds to a “charge control unit” that controls a current supplied from the electric device 60 to the power storage device 20.

When the charge request signal transmitted from the host ECU 110 is received, the battery ECU 120 starts charging the power storage device 20. At this time, the battery ECU 120 performs power conversion (not shown) provided in the power storage device 20 so that the value of the current detected by the detection circuit 81 serving as a current detection unit matches the target value indicated in the charge request signal. Control the operation of the instrument.

The heater ECU 130 is a control device for controlling the operation of the heater device 30. The heater ECU 130 includes a switching control unit 131 and a stop determination unit 132 as functional control blocks.

The switching control unit 131 is a part that controls the opening / closing operation of the switching

elements

41 and 42 and thereby adjusts the heat generation amount of the

heaters

31 and 32. The switching control unit 131 adjusts the duty in each open / close operation of the switching

elements

41 and 42 by transmitting a control signal to the drive circuit 40. The switching control unit 131 adjusts the duty as described above so that the heat generation amount in the

heaters

31 and 32 matches the required heat amount transmitted from the host ECU 110.

The “required heat amount” may be transmitted as individually including the target value of the heat generation amount of the heater 31 and the target value of the heat generation amount of the heater 32. , And the amount of heat generated by the heater 32 may be transmitted as a target value.

When the temperature of any of the

heaters

31 and 32 rises excessively, the heater ECU 130 according to the present embodiment switches the switching

elements

41 and 42 to an open state for safety and stops the

heaters

31 and 32. Is configured to do. The stop determination unit 132 is a part that determines whether or not the

heaters

31 and 32 are likely to stop as described above when the power storage device 20 is being charged.

The host ECU 110 is a control device that controls the overall operation of the in-vehicle auxiliary device 10. As already described, the host ECU 110 transmits a charge request signal to the battery ECU 120 to start or continue charging the power storage device 20. Further, the host ECU 110 transmits a required heat amount to the heater ECU 130 and performs a process of adjusting the heat generation amount in the

heaters

31 and 32. Furthermore, the host ECU 110 can also perform processing that mediates communication between the battery ECU 120 and the heater ECU 130.

The configuration of the control device as described above is merely an example. For example, the battery ECU 120, the heater ECU 130, and the host ECU 110 may not be divided into three devices, but may be configured as a single computer system as a whole. Further, at least one of the battery ECU 120, the heater ECU 130, and the host ECU 110 may be configured as a part of another ECU mounted on the vehicle.

A method for adjusting the current supplied to the power storage device 20 will be described with reference to FIG. A line L10 in FIG. 2 is a graph showing changes in the actual value of the current supplied to the power storage device 20. In FIG. 2, the direction in which the current output from the power storage device 20 flows is positive, that is, above the horizontal axis, and the direction in which the current supplied to the power storage device 20 flows is negative, that is, below the horizontal axis. Yes. However, in the following description, when “current supplied to the power storage device 20” is referred to, the absolute value thereof is indicated without considering the above sign. The current output from the power storage device 20 is a discharged current, and the current supplied to the power storage device 20 is a charged current.

In the example shown in FIG. 2, charging of the power storage device 20 and power supply to the

heaters

31 and 32 are performed simultaneously. For this reason, the value of the current supplied to the heater 31 or the like fluctuates in a rectangular wave shape as indicated by the line L10 with the switching operation of the switching element 41 or the like.

As already described, the value of the current supplied to the power storage device 20 is detected by the battery ECU 120 via the low-pass filter 83 and the detection circuit 81. Battery ECU 120 detects the value of the current supplied to power storage device 20 by sampling the signal from detection circuit 81 at a predetermined cycle. For this reason, the value of the current detected by the battery ECU 120 is an averaged value as shown by the line L11, unlike the actual current value as shown by the line L10.

In the present embodiment, a protection threshold is set as an upper limit of a current value range that can prevent lithium metal from being deposited on the electrode surface of the power storage device 20 with respect to a current flowing when the power storage device 20 is charged. . If the current value supplied to the power storage device 20 exceeds the protection threshold and the state continues for a certain period, the possibility that lithium metal will deposit on the electrode surface of the power storage device 20 increases.

The line L20 in FIG. 2 is a line indicating the change over time of the protection threshold. The value of the protection threshold is not always constant, but is set each time according to the charge / discharge history of the power storage device 20. For this reason, as indicated by a line L20, the value of the protection threshold changes with time. In addition, a well-known method can be used as a method for setting the protection threshold according to the charge / discharge history. For this reason, the description about the specific method is abbreviate | omitted here.

In the present embodiment, the charge request signal is transmitted from the host ECU 110 to the battery ECU 120 so that the current indicated by the line L11 is slightly smaller than the protection threshold value indicated by the line L20. The absolute value of the difference between the current indicated by line L11 and the protection threshold indicated by line L20 is smaller than the amplitude of the current indicated by line L10. For this reason, at the normal time, as shown in FIG. 2, the actual current (line L10) supplied to the power storage device 20 fluctuates across the protection threshold (L20). That is, the battery ECU 120 serving as the charge control unit causes the actual current (line L10) supplied to the power storage device 20 to vary across the protection threshold (L20) with the opening / closing operation of the switching

elements

41 and 42. The current is controlled. The “normal time” in the above is when current suppression control described later is not performed.

Note that when the above control is performed, the actual current supplied to the power storage device 20 repeatedly exceeds the protection threshold. However, the time that the current exceeds the protection threshold is a short time that is about the operation cycle of the switching

elements

41 and 42. For this reason, generation | occurrence | production of the phenomenon in which lithium metal precipitates on the electrode surface of the electrical storage apparatus 20 is prevented.

In the present embodiment, the current supplied to the power storage device 20 is brought close to the protection threshold as described above. As a result, the regenerative power obtained from the electric device 60 can be charged and effectively used by charging the power storage device 20 without wasting it as much as possible.

By the way, when the above-described control is performed, if a process for stopping the

heaters

31 and 32 for safety is performed, the current supplied to the power storage device 20 exceeds the protection threshold from that point. It will end up. This will be described with reference to FIG. In the example shown in FIG. 3, at time t10, the supply of power to the

heaters

31 and 32 is stopped, whereby the

heaters

31 and 32 stop operating.

Accordingly, the magnitude of the current supplied from the electric device 60 to the power storage device 20 is larger than before until the time t10. As a result, in a period after time t10, the current supplied to the power storage device 20 exceeds the protection threshold. Moreover, since the opening / closing operation | movement of the switching

elements

41 and 42 has stopped, said state is continued over a long time. As described above, if such a state is continued, the possibility that lithium metal is deposited on the electrode surface of the power storage device 20 increases.

In this embodiment, in order to prevent the state shown in FIG. 3 from occurring, the battery ECU 120 that is the charge control unit performs the current suppression control. An outline of the current suppression control will be described with reference to FIG.

In the example shown in FIG. 4, as in the case of FIG. 3, the supply of power to the

heaters

31 and 32 is stopped at time t10.

At time t01 prior to time t10, the stop determination unit 132 determines that the

heaters

31 and 32 are likely to stop. When such a determination is made, the battery ECU 120 performs current suppression control. “Current suppression control” refers to control for reducing the amount of charge charged in the power storage device 20 than before. In the above, “the amount of charge charged in the power storage device 20” is, for example, a current, and “until” means until time t01 in the example of FIG.

After time t01, the current suppression control is performed, so that the current values shown on the lines L10 and L11 become smaller. As a result, the difference between the protection threshold indicated by the line L20 and the current value indicated by L11 gradually increases.

When the

heaters

31 and 32 are stopped at time t10, the current supplied to the power storage device 20 also increases in the example shown in FIG. 4 as in the case of FIG. However, in the example shown in FIG. 4, since the current suppression control is performed in advance, the current values shown on the lines L10 and L11 are both suppressed to be smaller than the protection threshold value shown on the line L20. ing. In FIG. 4, the amount of increase in the current supplied to power storage device 20 after time t10 is shown as “ΔI”. Such a magnitude of ΔI can be estimated based on various physical quantities acquired by the detection circuit 81.

When performing the current suppression control, the battery ECU 120 determines that the value obtained by subtracting ΔI from the current value indicated by the line L11 is slightly smaller than the protection threshold value indicated by the line L20, from time t01 to time t10. During this period, the value of the current supplied to the power storage device 20 is adjusted. That is, in the current suppression control, the battery ECU 120 causes the current (lines L10 and L11) supplied to the power storage device 20 to exceed the protection threshold (L20) even when the

heaters

31 and 32 are stopped at the subsequent time t10. The current supplied to the power storage device 20 is reduced from the time before the time t10 so that there is no occurrence. In the above, “a value slightly smaller than the protection threshold indicated by the line L20” means a value slightly above the graph in FIG.

By performing such current suppression control, the current supplied to the power storage device 20 is maintained smaller than the protection threshold even after time t10. Thereby, the phenomenon that lithium metal is deposited on the electrode surface of power storage device 20 is prevented.

If the stop determination unit 132 determines that the

heaters

31 and 32 are unlikely to stop after the current suppression control is performed, the current suppression control is interrupted and supplied to the power storage device 20. The current value is restored to the original value. FIG. 5 shows an example of such a case.

In the example illustrated in FIG. 5, as in the case of FIG. 4, the stop determination unit 132 determines that the

heaters

31 and 32 are highly likely to stop at time t <b> 01. For this reason, after time t01, current suppression control is performed, and the current values shown on the lines L10 and L11 are small.

At the subsequent time t11, the stop determination unit 132 determines that the

heaters

31 and 32 are unlikely to stop. When such a determination is made, the battery ECU 120 interrupts the current suppression control. For this reason, in FIG. 11 and subsequent figures, the current value indicated by the line L11 gradually increases, and is returned to a value slightly smaller than the protection threshold value indicated by the line L20, that is, the original value. As a result, after time t11 when the current suppression control is interrupted, the current by the battery ECU 120 is such that the actual current (line L10) supplied to the power storage device 20 again fluctuates across the protection threshold (L20). Is controlled.

Details of specific processing performed to realize the current suppression control as described above will be described with reference to FIG. The series of processes shown in FIG. 6 is repeatedly executed by the heater ECU 130 every time a predetermined control cycle elapses. In addition, the process which performs each switching operation | movement of the switching

elements

41 and 42 is separately performed by the switching control part 131 in parallel with a series of processes shown by FIG.

In the first step S01, processing for acquiring various types of information from the host ECU 110 is performed by communication. The information acquired here includes information obtained from the battery ECU 120 via the host ECU 110 such as the operating state of the power storage device 20 and the charging rate of the power storage device 20. The “operating state of the power storage device 20” in the above is specifically “whether or not charging is in progress”.

In step S02 following step S01, it is determined whether or not the power storage device 20 is being charged and the charging rate of the power storage device 20 is equal to or greater than a predetermined value. The predetermined value is set in advance as a value lower than a high charging rate at which the performance of the power storage device 20 deteriorates. The “high charging rate at which the performance of the power storage device 20 is degraded” is, for example, 80%. The predetermined value set as a lower value is, for example, 60%. If the determination in step S02 is “Yes”, the process proceeds to step S03. In step S03, the process of continuing the switching operation of the switching

elements

41 and 42 is continued without performing the current suppression control. In this case, the control for adjusting the current supplied to the power storage device 20, that is, the control performed by the battery ECU 120 is the normal control described with reference to FIG.

If the determination in step S02 is “No”, the process proceeds to step S04. In step S04, it is determined whether or not the temperature of at least one of the

heaters

31 and 32 detected by the detection circuit 82 is equal to or higher than a second threshold value.

In this embodiment, regarding the temperature of the

heaters

31 and 32, “first” is set as the temperature at which power supply to the

heaters

31 and 32 is stopped for safety, that is, the upper limit of the temperature range in which the operation of the auxiliary machine is allowed to continue. “Threshold” is set. The “second threshold value” is a threshold value set in advance as a value smaller than the first threshold value, that is, a lower temperature. In the present embodiment, 90 ° C. is set as the first threshold, and 70 ° C. is set as the second threshold. As the first threshold value and the second threshold value, fixed values may be used constantly, or values that are changed according to the situation may be used.

In step S04, when both the temperatures of the

heaters

31 and 32 are lower than the second threshold value, the process proceeds to step S05. When the process proceeds to step S05, the temperatures of the

heaters

31 and 32 are sufficiently lower than the first threshold value. For this reason, the stop determination part 132 determines with the low possibility that the

heaters

31 and 32 will stop. In step S05, the result of the determination is notified to the host ECU 110. The notification is also sent to the battery ECU 120 via the host ECU 110.

At this time, if the current suppression control is temporarily performed by the battery ECU 120, the current suppression control is interrupted. In this case, the value of the current supplied to power storage device 20 changes as after time t11 in FIG. When the current suppression control is not performed by the battery ECU 120, the state is continued as it is.

Note that the process for interrupting the current suppression control is performed by the battery ECU 120 that has received the notification of step S05 via the host ECU 110. Instead of such an aspect, the host ECU 110 may change the content of the charge request signal transmitted to the battery ECU 120 to perform processing for interrupting the current suppression control. “Changing the content of the charging request signal” specifically means lowering the target value of the charging current.

After step S05, the process proceeds to step S03 described above. In this case, the control for adjusting the current supplied to the power storage device 20, that is, the control performed by the battery ECU 120 has been described with reference to FIG. 2 after the processing for interrupting the current suppression control is performed as necessary. Such normal control is performed.

In step S04, when the temperature of at least one of the

heaters

31 and 32 is equal to or higher than the second threshold value, the process proceeds to step S06. When the process proceeds to step S06, the temperatures of the

heaters

31 and 32 are rising and approaching the first threshold value. For this reason, the stop determination part 132 determines with the high possibility that the

heaters

31 and 32 will stop. In step S06, the result of the determination is notified to the host ECU 110. The notification is also sent to the battery ECU 120 via the host ECU 110.

The battery ECU 120 that has received the above notification starts the battery suppression control as described with reference to FIG. Battery ECU 120 reduces the value of the current supplied to power storage device 20 as after time t01 in FIG. In addition, when the current suppression control has already been performed at the time of shifting to step S06, the current suppression control is continued.

In step S07 following step S06, it is determined whether or not the temperature of at least one of the

heaters

31 and 32 detected by the detection circuit 82 is equal to or higher than the first threshold value. When both the temperatures of the

heaters

31 and 32 are less than the first threshold value, the process proceeds to step S08. In step S08, the process of continuing the switching operation of the switching

elements

41 and 42 is continued while continuing the current suppression control.

In step S07, when the temperature of at least one of the

heaters

31 and 32 is equal to or higher than the first threshold value, the process proceeds to step S09. In step S09, a process for stopping power supply to the

heaters

31, 32 is performed for safety. Specifically, the switching control unit 131 performs a process for opening both the

switching elements

41 and 42. Thereby, the value of the current supplied to power storage device 20 changes as after time t10 in the example of FIG. Although the value of the current supplied to the power storage device 20 increases, the current value does not exceed the protection threshold because the current suppression control has been performed in advance.

As described above, in the in-vehicle auxiliary device 10 according to the present embodiment, when the power storage device 20 is charged, at least before the

heaters

31 and 32 that are auxiliary devices are stopped, Notification is made to the battery ECU 120, which is the charge control unit, and then the operation of the

heaters

31, 32 is stopped. Thereby, the battery ECU 120 can take necessary measures before the

heaters

31 and 32 are stopped. Specifically, when it is determined by the stop determination unit 132 that there is a high possibility that the

heaters

31 and 32 that are auxiliary devices are stopped, the battery ECU 120 that is a charge control unit is supplied to the power storage device 20. Current suppression control, which is control to make the current smaller than before, is performed.

Thereby, even if the power supply to the

heaters

31 and 32 is stopped thereafter, the current supplied to the power storage device 20 does not remain in a state exceeding the protection threshold. Precipitation of lithium metal at the electrode of the power storage device 20 can be prevented, and performance degradation of the power storage device 20 can be prevented.

The battery ECU 120 performs current suppression control when the stop determination unit 132 determines that the

heaters

31 and 32 are likely to stop and the charge rate in the power storage device 20 is equal to or greater than a predetermined value. “When the charging rate in the power storage device 20 is equal to or greater than a predetermined value” refers to a place where the determination in step S02 is Yes.

It is known that the deposition of lithium metal at the electrode of the power storage device 20 is particularly likely to occur when the charge rate of the power storage device 20 is high. In the present embodiment, the scene where the current suppression control is executed is limited to the case where lithium metal is likely to be deposited on the electrode as described above. Thereby, more charging opportunities to the power storage device 20 are ensured.

In the present embodiment, for the temperatures of the

heaters

31 and 32, a first threshold that is an upper limit of a range in which the operation of the auxiliary machine is allowed to continue and a second threshold that is smaller than the first threshold are respectively provided. Is set. The stop determination unit 132 determines that the auxiliary machine is likely to stop when the temperature exceeds the second threshold, that is, when the determination in step S04 is Yes.

It can be said that the temperature of the

heaters

31 and 32 compared with the first threshold value and the second threshold value is a parameter indicating the operating state of the auxiliary machine. As such a parameter, a physical quantity other than “temperature of the

heaters

31 and 32” may be used as in the second embodiment described below. A plurality of physical quantities may be used as the above parameters.

The second embodiment will be described. In the present embodiment, not the temperature of the

heaters

31 and 32 but the voltage value of the

heaters

31 and 32 is used as a parameter indicating the operation state of the auxiliary machine, that is, a parameter to be compared with the first threshold value and the second threshold value. The voltage value is detected by the detection circuit 82 and transmitted to the heater ECU 130.

7 is a process executed by the heater ECU 130 according to the present embodiment, and is executed instead of the series of processes shown in FIG. 7 is a process in which step S04 in FIG. 6 is replaced with step S14, and step S07 in FIG. 6 is replaced with step S17. In the following, differences from the processing shown in FIG. 6 will be mainly described.

In step S14, it is determined whether or not the value of the applied voltage in at least one of the

heaters

31 and 32 detected by the detection circuit 82 is greater than or equal to the second threshold value.

In the present embodiment, the voltage applied to the

heaters

31 and 32 is a voltage value for stopping the power supply to the

heaters

31 and 32 for safety, that is, a voltage value range in which the operation of the auxiliary machine is allowed to continue. The “first threshold value” is set as the upper limit. The “second threshold value” is a threshold value set in advance as a value smaller than the first threshold value, that is, as a low voltage. In the present embodiment, 600V is set as the first threshold, and 500V is set as the second threshold.

In step S14, when the voltage values of the

heaters

31 and 32 are both less than the second threshold value, the process proceeds to step S05. The subsequent processing is the same as that described with reference to FIG.

When the voltage value of at least one of the

heaters

31 and 32 is equal to or greater than the second threshold value, the process proceeds to step S06. As already described, in step S06, the stop determination unit 132 determines that the

heaters

31 and 32 are likely to stop. In step S06, the result of the determination is notified to the host ECU 110. The notification is also sent to the battery ECU 120 via the host ECU 110. Thereby, current suppression control is started.

In step S17 following step S06, it is determined whether or not the voltage value of at least one of the

heaters

31 and 32 detected by the detection circuit 82 is greater than or equal to the first threshold value. When the voltage values of the

heaters

31 and 32 are both less than the first threshold value, the process proceeds to step S08. In step S08, the process of continuing the switching operation of the switching

elements

41 and 42 is continued while continuing the current suppression control.

In step S17, when the voltage value of at least one of the

heaters

31 and 32 is equal to or higher than the first threshold value, the process proceeds to step S09. The subsequent processing is the same as that described with reference to FIG. Even in the above-described aspect, the same effects as those described in the first embodiment can be obtained.

The third embodiment will be described. In the present embodiment, the current value of the

heaters

31 and 32 is used as the parameter indicating the operating state of the auxiliary machine, that is, the parameter compared with the first threshold value and the second threshold value, instead of the temperature of the

heaters

31 and 32. The current value is detected by the detection circuit 82 and transmitted to the heater ECU 130.

The series of processes shown in FIG. 8 is a process executed by the heater ECU 130 according to the present embodiment, and is executed in place of the series of processes shown in FIG. The series of processes shown in FIG. 8 is a process in which step S04 in FIG. 6 is replaced with step S24, and step S07 in FIG. 6 is replaced with step S27. In the following, differences from the processing shown in FIG. 6 will be mainly described.

In step S24, it is determined whether or not the value of the current flowing through at least one of the

heaters

31 and 32 detected by the detection circuit 82 is equal to or greater than the second threshold value.

In the present embodiment, regarding the current flowing through each of the

heaters

31 and 32, a current value for stopping the power supply to the

heaters

31 and 32 for safety, that is, a current value range in which the operation of the auxiliary machine is allowed to continue. The “first threshold value” is set as the upper limit of. The “second threshold value” is a threshold value set in advance as a value smaller than the first threshold value. In the present embodiment, 120A is set as the first threshold, and 80A is set as the second threshold.

In step S24, when the current values of the

heaters

When the current value of at least one of the

heaters

In step S27 following step S06, it is determined whether or not the current value of at least one of the

heaters

31 and 32 detected by the detection circuit 82 is greater than or equal to the first threshold value. When the current values of the

heaters

elements

41 and 42 is continued while continuing the current suppression control.

In step S27, when the current value of at least one of the

heaters

31 and 32 is equal to or greater than the first threshold value, the process proceeds to step S09. The subsequent processing is the same as that described with reference to FIG. Even in the above-described aspect, the same effects as those described in the first embodiment can be obtained.

The fourth embodiment will be described. In the present embodiment, the method for setting the protection threshold is different from that in the first embodiment.

FIG. 9 shows an example of the time change of the current supplied to the power storage device 20 as in FIG. 4 described above. The line L21 shown in FIG. 9 indicates that the current value at which the lithium metal is deposited on the electrode of the power storage device 20, that is, the lithium metal is deposited when the state of being slightly exceeded is maintained. Is the time change of the current value that makes it very likely to occur. Such a current value is calculated each time according to the charge / discharge history of the power storage device 20.

In the first embodiment, the current value calculated as described above is directly set as the protection threshold (line L20 in FIG. 4). On the other hand, in the present embodiment, a value obtained by subtracting the predetermined margin M from the current value (line L21) calculated as described above is set as the protection threshold (line L20 in FIG. 9). The Since the protection threshold is set as a value smaller than that of the first embodiment and the current suppression control is performed so that the current value does not exceed the threshold value, the phenomenon that lithium metal is deposited on the electrode of the power storage device 20 is further reduced. It can be surely prevented.

In the above description, the example in which the

heaters

31 and 32 for heating the air are used as the auxiliary machine that receives power supply from the power storage device 20 has been described. The

heaters

31 and 32 may be for heating water instead of air. In addition, as an auxiliary device that receives power supply from the power storage device 20, a device other than a heater may be used.

The embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those in which those skilled in the art appropriately modify the design of these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the specific examples described above and their arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

The control apparatus and control method described in the present disclosure includes one or more dedicated units provided by configuring a processor and a memory programmed to perform one or more functions embodied by a computer program. It may be realized by a computer. The control device and control method described in the present disclosure may be realized by a dedicated computer provided by configuring a processor including one or more dedicated hardware logic circuits. A control apparatus and a control method described in the present disclosure are configured by a combination of a processor and a memory programmed to perform one or more functions and a processor including one or more hardware logic circuits. It may be realized by one or a plurality of dedicated computers. The computer program may be stored in a computer-readable non-transitional tangible recording medium as instructions executed by the computer. The dedicated hardware logic circuit and the hardware logic circuit may be realized by a digital circuit including a plurality of logic circuits or an analog circuit.

Claims

A vehicle-mounted auxiliary device (10),
A power storage device (20);
Auxiliaries (31, 32) that receive power from the power storage device;
Switching units (41, 42) for adjusting the magnitude of power supplied to the auxiliary machine by opening and closing;
A switching control unit (131) for controlling the opening and closing operation of the switching unit;
An electric device (60) for performing at least a charging operation on the power storage device;
A charge control unit (120) for controlling a charge state charged from the electric device to the power storage device,
A vehicle-mounted auxiliary device that stops the operation of the auxiliary device after notifying the charging control unit at least before the auxiliary device stops when the power storage device is being charged.
A stop determination unit (132) for determining whether or not the auxiliary machine is likely to stop;
When it is determined by the stop determination unit that the auxiliary machine is highly likely to stop,
The in-vehicle auxiliary device according to claim 1, wherein the charge control unit performs current suppression control, which is control for making the amount of charge charged in the power storage device smaller than before.
About the parameter indicating the operating state of the auxiliary machine,
A first threshold that is an upper limit of a range in which the operation of the auxiliary machine is allowed to continue;
A second threshold value that is smaller than the first threshold value is set, and
The in-vehicle accessory device according to claim 2, wherein the stop determination unit determines that the accessory is likely to stop when the parameter exceeds the second threshold value.
The on-vehicle auxiliary device according to claim 3, wherein the parameter is at least one of a temperature, a voltage value, and a current value of the auxiliary device.
The charge controller is
The current suppression control is performed when the stop determination unit determines that the auxiliary machine is highly likely to stop and the charge rate of the power storage device is equal to or higher than a predetermined value. The in-vehicle auxiliary machine device according to any one of the above.
The in-vehicle auxiliary device according to any one of claims 2 to 5, wherein the power storage device is a lithium ion battery.
About the current that flows when the power storage device is charged,
A protection threshold is set as an upper limit of a current value range that can prevent lithium metal from being deposited on the electrode surface of the power storage device,
In the current suppression control, the charge control unit,
The in-vehicle use according to claim 6, wherein the current charged in the power storage device is reduced so that the current charged in the power storage device does not exceed the protection threshold even when the auxiliary machine is stopped. Auxiliary equipment.
The protection threshold is
The in-vehicle auxiliary device according to claim 7, wherein the on-vehicle auxiliary device is a value obtained by subtracting a predetermined margin (M) from a current value at which lithium metal is deposited on the electrode of the power storage device.
When the current suppression control is not performed,
The charge controller is
The in-vehicle accessory device according to claim 7 or 8, wherein the current is controlled so that the current charged in the power storage device varies across the protection threshold in accordance with the opening / closing operation of the switching unit.
The on-vehicle auxiliary device according to any one of claims 1 to 9, wherein the auxiliary device is a heater configured to generate heat and heat water or air upon receiving power supply.