JP5151664B2 - Control device for power supply system, control method, program for realizing the method, and recording medium recording the program - Google Patents

Description

  The present invention relates to control of a power supply system, and more particularly to a technique for controlling charge / discharge of a power supply system.

  2. Description of the Related Art A vehicle control apparatus that manages charge / discharge of a battery according to the temperature of the battery is known. However, in a conventional automobile control device, a temperature sensor for detecting the temperature of the battery is provided, and charging / discharging of the battery is managed according to the detected temperature of the battery. Therefore, there exists a problem that the cost which provides a temperature sensor starts. A technique for solving such a problem is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-328905 (Patent Document 1).

  The battery control device disclosed in this publication controls a battery of an automobile provided with at least an engine as a vehicle driving source. This control device is a means for detecting the coolant temperature of the engine and a means for retaining the stored contents even when the ignition is turned off, and stores the estimated battery temperature and the engine coolant temperature immediately after the ignition is turned off. Is stored in the storage means based on the engine cooling water temperature stored immediately after the ignition is turned off and the engine cooling water temperature detected immediately after the ignition is turned on. Means for correcting the estimated temperature value of the battery.

According to the battery control device disclosed in this publication, it is possible to accurately estimate the battery temperature without installing a sensor for detecting the battery temperature, and to manage the charging / discharging of the battery based on the estimated battery temperature. can do.
JP 2004-328905 A

  By the way, when current flows through the battery, current also flows through energized components such as a harness and a relay connected to the battery, and Joule heat is generated in these energized components. Therefore, when the temperature of the energized component rises and exceeds the allowable temperature, the energized component may not function normally.

  However, in the control device disclosed in Patent Document 1, since charging / discharging of the battery is controlled only by the estimated temperature value of the battery, it is not possible to appropriately protect the energized components.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power supply system including a power storage mechanism and a component electrically connected to the power storage mechanism. It is an object to provide a control device, a control method, a program that realizes the method, and a recording medium that records the program that can appropriately protect the connected components.

  A control device according to a first invention controls a power supply system including a power storage mechanism and a component electrically connected to the power storage mechanism. The control device includes a means for detecting a current value of the power storage mechanism a plurality of times during an operation time of the power supply system, and a calculating means for calculating a value related to the temperature of the component based on the current value detected a plurality of times. And a limiting means for limiting the input / output power of the power storage mechanism based on a value related to temperature, a means for storing a value related to temperature when the power supply system is switched from an operating state to a stopped state, and a power supply system Means for detecting the stop time until the power system is switched from the stop state to the restart state, and when the power system is switched to the restart state after the stop time has elapsed, based on the stored value and the stop time, Setting means for setting an initial value of a value relating to temperature. The control method according to the fifth invention has the same requirements as the control device according to the first invention.

  According to 1st or 5th invention, the temperature of components (harness, a system main relay, etc.) electrically connected to the electrical storage mechanism rises according to the energized current value and energization time. Therefore, a value related to the temperature of the component is calculated based on the current value of the power storage mechanism detected a plurality of times during the operation time of the power supply system. Thereby, the value regarding the temperature of components can be estimated appropriately according to an electric current value and energization time, without providing a dedicated temperature sensor etc. Based on this temperature-related value, the input / output power of the power storage mechanism is limited so that the component does not exceed the allowable temperature. However, if the initial value of the temperature-related value is set to a value that does not correlate at all with the actual component temperature, there is a possibility that the input / output power of the power storage mechanism cannot be appropriately limited in the initial operation of the power supply system. Therefore, when the power supply system is switched from the operating state to the stopped state, a value related to temperature is stored. When the power system is switched to the restart state after the stop time until the power system is switched from the stop state to the restart state, the initial value for the temperature is determined based on the stored value and the stop time of the power system. Value is set. Thereby, the initial value of the value relating to the temperature can be set to a value correlated with the actual temperature of the part. For example, if the temperature of a component when the power supply system is stopped is high and the power supply system is stopped for a short time, the component is considered to be still in a high temperature state, so the initial value related to the temperature is stored. It can be set to a value close to the value. Therefore, even in the initial stage of operation of the power supply system, the input / output power of the power storage mechanism can be limited early to protect the components appropriately. As a result, in a power supply system including a power storage mechanism and a component electrically connected to the power storage mechanism, a control device and a control method capable of appropriately protecting the component electrically connected to the power storage mechanism are provided. be able to.

  In the control device according to the second invention, in addition to the configuration of the first invention, the setting means includes means for setting the initial value closer to the stored value as the stop time is shorter. The control method according to the sixth invention has the same requirements as the control device according to the second invention.

  According to the second or sixth aspect of the invention, when the power supply system is in a stopped state, the actual component temperature decreases with time. That is, the actual component temperature is closer to the temperature when the power supply system is stopped as the power supply system stop time is shorter. Therefore, the shorter the stop time, the closer the initial value is to the stored value. Thereby, the initial value of the value relating to the temperature can be correlated with the temperature of the component.

  In the control device according to the third aspect of the invention, in addition to the configuration of the first aspect of the invention, the calculating means includes means for calculating a value related to temperature larger as the temperature of the component is higher. The limiting means includes means for limiting input / output power when the value related to temperature is greater than a threshold value. The setting means includes means for setting the initial value larger as the stop time is shorter. The control method according to the seventh invention has the same requirements as the control device according to the third invention.

  According to the third or seventh aspect of the invention, the value related to temperature is calculated larger as the temperature of the component is higher. Input / output power is limited when the value for temperature is greater than the threshold. For example, when the temperature of a component when the power supply system is stopped is high and the power supply system is stopped for a short time, it is considered that the component is still in a high temperature state. Thus, the shorter the stop time, the larger the initial value is set. Thereby, the input / output power can be appropriately limited by correlating the initial value of the temperature-related value with the temperature of the component.

  In the control device according to the fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the setting means sets the initial value to be larger as the stop time is shorter, and in addition to the initial time as the stop time is longer. Means for setting the initial value small while reducing the decrease amount are included. The control method according to the eighth invention has the same requirements as the control device according to the fourth invention.

  According to the fourth or eighth aspect of the invention, when the power supply system is in a stopped state, the actual component temperature decreases as the power supply system stop time increases. In addition, the actual temperature of the component gradually decreases as it approaches the ambient temperature. That is, the longer the stop time, the smaller the amount of time decrease. Therefore, as the stop time is longer, the initial value is set smaller while reducing the time decrease amount of the initial value. Thereby, the initial value of the value relating to the temperature can be correlated with the temperature of the component that is lowered while the power supply system is stopped.

  In the program according to the ninth invention, a computer is caused to execute the control method according to any of the fifth to eighth inventions. A recording medium according to a tenth invention records a computer-readable program for causing a computer to execute the control method according to any of the fifth to eighth inventions.

  According to the ninth or tenth invention, the control method according to any of the fifth to eighth inventions can be realized using a computer (which may be general purpose or dedicated).

  In the control device according to the eleventh invention, in addition to the configuration of the first invention, the calculation means calculates the amount of change per unit time of the value related to the temperature of the component based on the current value detected at least a plurality of times. change.

  In the control device according to the twelfth invention, in addition to the configuration of the eleventh invention, the calculating means calculates an average value of the current values detected a plurality of times, and the calculated average value is the first average value. The amount of change per unit time when the value is is smaller than the amount of change per unit time when the second average value is larger than the first average value.

  In the control device according to the thirteenth invention, in addition to the configuration of the eleventh invention, the calculating means determines whether or not the value related to the temperature of the component has increased, and the current value detected a plurality of times is obtained. In addition, the amount of change per unit time is changed based on the determination result of whether or not the value related to the temperature of the component has increased.

  In the control device according to the fourteenth invention, in addition to the configuration of the thirteenth invention, the calculating means calculates an average value of the current values detected a plurality of times, and the calculated average value is a predetermined value. Is smaller than the amount of change per unit time when the value related to the temperature of the component is increasing.

  In the control device according to the fifteenth aspect of the invention, in addition to the configuration of the first aspect of the invention, the restricting means includes a value related to the temperature and the threshold value when the temperature value exceeds a predetermined threshold value. The limit amount of input / output power of the power storage mechanism is changed according to the difference.

  The control methods according to the sixteenth to twentieth inventions have the same requirements as the control devices according to the eleventh to fifteenth inventions, respectively.

  A control device according to a twenty-first aspect controls a power supply system including a power storage mechanism and a component electrically connected to the power storage mechanism. The control device includes a detection unit for detecting the current value of the power storage mechanism a plurality of times, a calculation unit for calculating a value related to the temperature of the component based on the current value detected a plurality of times, and a value related to the temperature. And limiting means for limiting the input / output power of the power storage mechanism. The calculation means changes the amount of change per unit time of the value related to the temperature of the component based on the current value detected at least a plurality of times.

  In the control device according to the twenty-second invention, in addition to the configuration of the twenty-first invention, the calculating means calculates an average value of the current values detected a plurality of times, and the calculated average value is the first average value. The amount of change per unit time when the value is is smaller than the amount of change per unit time when the second average value is larger than the first average value.

  In the control device according to the twenty-third aspect of the invention, in addition to the configuration of the twenty-first aspect, the calculating means determines whether or not the value related to the temperature of the component has increased, and sets the current value detected multiple times. In addition, the amount of change per unit time is changed based on the determination result of whether or not the value related to the temperature of the component has increased.

  In the control device according to the twenty-fourth invention, in addition to the configuration of the twenty-third invention, the calculating means calculates an average value of the current values detected a plurality of times, and the calculated average value is a predetermined value. Is smaller than the amount of change per unit time when the value related to the temperature of the component is increasing.

  A control device according to a twenty-fifth aspect of the invention controls a power supply system that includes a power storage mechanism and components that are electrically connected to the power storage mechanism. The control device includes a detection unit for detecting the current value of the power storage mechanism a plurality of times, a calculation unit for calculating a value related to the temperature of the component based on the current value detected a plurality of times, and a value related to the temperature. And limiting means for limiting the input / output power of the power storage mechanism. When the value related to temperature is larger than the threshold value, the limiting means changes the limit amount of input / output power of the power storage mechanism according to the difference between the value related to temperature and the threshold value.

  The control methods according to the twenty-sixth to thirtieth inventions have the same requirements as the control devices according to the twenty-first to twenty-fifth inventions, respectively.

  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.

<First Embodiment>
With reference to FIG. 1, the structure of the electric vehicle 20 equipped with the control device of the power supply system according to the present embodiment will be described. The vehicle to which the control device according to the present invention can be applied is not limited to the electric vehicle 20 shown in FIG. 1 and may be an electric vehicle having another aspect. Further, instead of an electric vehicle, a hybrid vehicle that travels by the power of an engine and a motor may be used.

  The electric vehicle 20 includes driving wheels 22A and 22B, a driving shaft 26 connected to the driving wheels 22A and 22B via a differential gear 24, and a traveling motor 30 that outputs driving power to the driving shaft 26. A traveling battery 300, an inverter 34, a boost converter 36, an SMR 200, a monitoring unit 400, and an electronic control unit (ECU) 100.

  The motor 30 is configured, for example, as a known permanent magnet (PM) type synchronous generator motor, and is driven by three-phase AC power from the inverter 34.

  Inverter 34 is provided between motor 30 and battery 300. The inverter 34 supplies the DC power from the battery 300 to the motor 30 as pseudo three-phase AC power by PWM (Pulse Width Modulation) control or the like.

  Boost converter 36 is provided between inverter 34 and battery 300. When the electric vehicle 20 is accelerated, the rated voltage of the battery 300 is boosted by the boost converter 36 and supplied to the inverter 34. At the time of regenerative braking of the electric vehicle 20, the regenerative voltage converted into a DC voltage by the inverter 34 is stepped down by the boost converter 36 and supplied to the battery 300.

  SMR 200 is provided between boost converter 36 and battery 300. The SMR 200 is a relay that closes a contact that is turned on when an exciting current is applied to the coil. The battery 300 is a secondary battery that stores electric power supplied to the motor 30. The monitoring unit 400 is connected to the battery 300 and monitors the state of the battery 300. The SMR 200, the battery 300, and the monitoring unit 400 will be described in detail later.

The ECU 100 is configured as a microprocessor centered on a CPU (Central Processing Unit) 101. In addition to the CPU 101, a ROM (Read Only Memory) 102 that stores a processing program and a volatile memory that temporarily stores data. A random access memory (RAM) 103 that is a memory, a static random access memory (SRAM) 104 that is a nonvolatile memory, a timer 105, and an input / output port (not shown) are provided.

  ECU 100 receives detection signal θ from rotational position detection sensor 32 that detects the rotational position of the rotor of motor 30, and phase currents iu, iv, iw from current sensors (not shown) attached to each phase of inverter 34, A shift position SP from the shift position sensor 52 that detects the operating position of the shift lever 51, an accelerator opening degree ACC from the accelerator pedal position sensor 54 that detects the operation amount of the accelerator pedal 53, and a brake that detects the operation amount of the brake pedal 55 The brake pedal operation amount BP from the pedal position sensor 56, the vehicle speed V from the vehicle speed sensor 58, and the like are input via the input port.

  Further, a signal from the ignition switch 60 is input to the ECU 100 via an input port. The ignition switch 60 is operated by the user. As the position of the ignition switch 60, at least an off position and an on position are provided.

  When the position of the ignition switch 60 is switched from the off position to the on position, electric power from an auxiliary battery (not shown) is supplied to the ECU 100, the ECU 100 enters an operating state, and execution of various programs is started.

  When the position of the ignition switch 60 is switched from the on position to the off position, the power supply from the auxiliary battery to the ECU 100 is cut off, the ECU 100 is stopped, the program execution is stopped, and the program is stored in the RAM 103. Data is cleared.

  The SRAM 104 and the timer 105 are directly connected to the auxiliary battery, and power from the auxiliary battery is always supplied regardless of the position of the ignition switch 60. Thereby, even if ECU100 stops, SRAM104 can continue holding the memorized data. The timer 105 can continue to measure time even when the ECU 100 stops.

  A power supply system according to an embodiment of the present invention will be described with reference to FIG. This power supply system includes an ignition switch 60, an ECU 100, an SMR 200, a battery 300, and a monitoring unit 400.

  The SMR 200 is composed of SMR (1) 210 and SMR (2) 220 on the positive electrode side and SMR (3) 230 on the negative electrode side.

  When the position of the ignition switch 60 is switched from the off position to the on position, the ECU 100 enters the operating state as described above. Thereafter, the ECU 100 first turns on the SMR (3) 230 and then turns on the SMR (1) 210 to execute precharge. Since the limiting resistor 212 is connected to the SMR (1) 210, the voltage applied to the inverter 34 rises gently even when the SMR (1) 210 is turned on, and the occurrence of an inrush current can be prevented. After executing the precharge, ECU 100 turns on SMR (2) 220.

  When the position of ignition switch 60 is switched from the on position to the off position, ECU 100 turns off SMR (1) 210, SMR (2) 220, and SMR (3) 230 in order to prevent leakage from battery 300 and the like. Thereafter, as described above, ECU 100 is stopped.

  In the following description, the operating state of the power supply system means that at least the ECU 100 is in an operating state, and is not necessarily limited to the SMR 200 being turned on. Further, the stop state of the power supply system means that at least the ECU 100 is in a stop state, and is not necessarily limited to the SMR 200 being turned off.

  Battery 300 is connected to SMR 200 with a wire harness. The battery 300 includes a battery module 310 and a service plug 320. The battery module 310 is formed by further connecting a plurality of modules in which a plurality of cells are connected in series. The service plug 320 has a built-in fuse and is connected in series to the battery module 310 in a state where the user can remove it at the time of vehicle maintenance or the like.

  The monitoring unit 400 includes a voltage sensor, a current sensor, and a temperature sensor (all not shown) provided in the battery 300, a voltage value between terminals of the battery 300, a charge / discharge current value of the battery 300 (hereinafter, battery current value). Information such as the temperature of the battery 300 is input. The monitoring unit 400 transmits these pieces of information to the ECU 100.

  Based on information transmitted from monitoring unit 400, ECU 100 calculates the SOC of battery 300 (hereinafter also simply referred to as SOC or remaining battery capacity SOC). The SOC is normally set to about 60% so that energy can be recovered whenever regeneration is performed. Further, the upper limit value and the lower limit value of the SOC are set, for example, with the upper limit value set to 80% and the lower limit value set to 30% in order to suppress deterioration of the battery 300. The ECU 100 sets the SOC to the upper limit value and the lower limit value. Power generation and regeneration by the motor 30 and motor output are controlled so as not to exceed. In addition, the value quoted here is an example and is not a particularly limited value.

  Further, ECU 100 determines battery charge power limit value (maximum value of power charged in battery 300) WIN and battery discharge power limit value (maximum power discharged from battery 300) based on the temperature of battery 300, SOC, and the like. Value) WOUT is calculated. ECU 100 limits the charge / discharge power of battery 300 so as not to exceed battery charge power limit value WIN and battery discharge power limit value WOUT. Thereby, overdischarge and overcharge of the battery 300 are prevented, and the battery 300 is protected.

  In the present embodiment, when a current flows through the battery module 310, a current-carrying component (for example, the service plug 320, the electrode terminal of the battery 300, the SMR 200, the battery 300 and the SMR 200 is electrically connected to the battery module 310. A current also flows through the connected wire harness and the like, and Joule heat is generated in these energized parts. Therefore, when the temperature of the energized component rises and exceeds the allowable temperature, the energized component may not function normally.

  Therefore, in the present embodiment, based on the battery current value I detected during the operation time of the power supply system, the evaluation value F related to the temperature of these energized components is calculated, and based on the calculated evaluation value F, The battery charge power limit value WIN and the battery discharge power limit value WOUT are changed.

  With reference to FIG. 3, a functional block diagram of the control device according to the present embodiment will be described. As shown in FIG. 3, the control device includes a current value detection unit 110, an evaluation value calculation unit 120, a WIN / WOUT change unit 130, a system off time detection unit 140, an evaluation value storage unit 150, an initial value A value calculation unit 160.

  The current value detection unit 110 detects the battery current value I based on the signal from the monitoring unit 400.

  The evaluation value calculation unit 120 calculates an evaluation value F that is a value used for evaluating the temperature state of the energized component. Evaluation value calculation unit 120 calculates evaluation value F based on battery current value I and an evaluation value stored in RAM 103 (an evaluation value calculated last time).

  The WIN / WOUT changing unit 130 changes the battery charging power limit value WIN and the battery discharging power limit value WOUT based on the evaluation value F calculated by the evaluation value calculation unit 120, and the battery 300 is changed with the changed WIN and WOUT. The inverter 34 and the step-up converter 36 are controlled so as to limit the power.

  Based on the signal from ignition switch 60 and the signal from timer 105, system off time detector 140 detects the duration of the power supply system stop state (hereinafter also referred to as system off time TOFF).

  The evaluation value storage unit 150 stores the evaluation value F in the SRAM 104 based on the signal from the ignition switch 60.

  The initial value calculation unit 160 sets an initial value of the evaluation value F based on the signal from the ignition switch 60, the system off time TOFF, and the evaluation value F stored in the SRAM 104.

  The control device according to the present embodiment having such a functional block is read from the CPU 101 and the ROM 102 and the ROM 102 included in the ECU 100 and executed by the CPU 101 even with hardware mainly composed of digital circuits and analog circuits. It can also be realized by software mainly composed of programs. In general, it is said that it is advantageous in terms of operation speed when realized by hardware, and advantageous in terms of design change when realized by software. Below, the case where a control apparatus is implement | achieved as software is demonstrated. Note that a recording medium on which such a program is recorded is also an embodiment of the present invention.

  Referring to FIG. 4, a control structure of a program executed by ECU 100 as the control device according to the present embodiment when ignition switch 60 is in the on position (that is, when the power supply system is in an operating state) will be described. To do. Note that this program is repeatedly executed at a predetermined cycle time.

  In step (hereinafter, step is abbreviated as S) 100, ECU 100 determines whether or not the position of ignition switch 60 has been switched from the off position to the on position. When switched from the off position to the on position (YES in S100), the process proceeds to S300. Otherwise (NO in S100), the process proceeds to S104.

  In S300, ECU 100 performs an initial value setting process for evaluation value F. This process will be described in detail later. In S102, ECU 100 reads the initial value of evaluation value F from RAM 103.

  In S <b> 104, ECU 100 reads evaluation value F (N−1) calculated last time from RAM 103.

  In S106, ECU 100 detects battery current value I based on a signal from monitoring unit 400.

  In S108, ECU 100 calculates evaluation value F (N), which is the current value of evaluation value F. The ECU 100 sets the evaluation value F (N) larger as the temperature of the energized component is higher so as to correlate with the temperature of the energized component. Further, ECU 100 calculates evaluation value F (N) based on a plurality of detected battery current values I (that is, taking into account battery current value I and energization time) so as to correlate with the temperature of the energized component. calculate. For example, ECU 100 calculates evaluation value F (N) as {(K−1) × evaluation value F (N−1) + (I square value)} / K. When the previously calculated evaluation value F (N−1) does not exist, the ECU 100 sets the evaluation value F (N) as {(K−1) × (initial value of the evaluation value F) + (I Squared value)} / K. Here, K is a constant of 1 or more, and is set in advance according to a change in the temperature of the energized component during the cycle time when this program is executed. The method for calculating the evaluation value F is not limited to this. For example, the energization time may be separately detected, and the evaluation value F may be calculated based on the energization time and the battery current value I.

  In S110, ECU 100 determines whether or not evaluation value F (N) is greater than a threshold value. This threshold value is set in advance based on the allowable temperature of the energized component. If evaluation value F (N) is larger than the threshold value (YES in S110), the process proceeds to S112. Otherwise (NO in S110), the process proceeds to S114.

  In S112, ECU 100 changes battery charging power limit value WIN and battery discharging power limit value WOUT to be low.

  In S114, ECU 100 does not change battery charge power limit value WIN and battery discharge power limit value WOUT. In S <b> 116, ECU 100 stores evaluation value F (N) in RAM 103.

  With reference to FIG. 5, a control structure of a program executed when ECU 100 as the control device according to the present embodiment stores evaluation value F in SRAM 104 will be described.

  In S200, ECU 100 determines whether or not the position of ignition switch 60 has been switched from the on position to the off position. When the on position is switched to the off position (YES in S200), the process proceeds to S202. Otherwise (NO in S200), this process ends.

  In S202, ECU 100 stores evaluation value F in SRAM 104. In S204, ECU 100 instructs timer 105 to start the timer.

  In S206, ECU 100 cuts off the power supply from the auxiliary battery so as to place ECU 100 in a stopped state.

  Referring to FIG. 6, a control structure of a program executed when ECU 100 as the control device according to the present embodiment performs the process of S300 of FIG. 4 (initial value setting process of evaluation value F) will be described. To do.

  In S302, ECU 100 instructs timer 105 to stop the timer started in S204 of FIG. In S304, ECU 100 detects system off time TOFF. ECU 100 detects the time measured by timer 105 as system off time TOFF.

  In S306, ECU 100 reads evaluation value F stored in SRAM 104 while the power supply system is stopped.

  In S308, ECU 100 sets an initial value of evaluation value F based on evaluation value F read from SRAM 104 and system off time TOFF. The ECU 100 sets the initial value of the evaluation value F so as to correlate with the temperature of the energized component that decreases according to the system off time TOFF. Specifically, the ECU 100 sets the initial value of the evaluation value F to be closer to the evaluation value F read from the SRAM 104 as the system off time TOFF is shorter, and the evaluation value F increases as the system off time TOFF is longer. The initial value of the evaluation value F is set to be small while decreasing the time decrease amount of the initial value. For example, the ECU 100 sets the initial value of the evaluation value F as (the square value of the evaluation value F read from the SRAM 104) × [T (OFF value of (K−1) / K})]. The method for setting the initial value of the evaluation value F is not limited to this. In S310, ECU 100 stores the calculated initial value of evaluation value F in RAM 103.

  The power limitation of battery 300 controlled by ECU 100, which is the control device according to the present embodiment, based on the above-described structure and flowchart will be described.

  The temperature of the energized component increases according to the energized current value (that is, battery current value I) and energization time. Therefore, while the operating state of the power supply system continues (NO in S100), the evaluation value F (N) used for evaluating the temperature state of the energized component takes into account the battery current value I and the energization time. Calculated (S108). Specifically, the evaluation value F (N) is calculated as {(K−1) × evaluation value F (N−1) + (I square value)} / K (S108). Thereby, it is possible to appropriately estimate the temperature of the energized component without providing a dedicated temperature sensor or the like. Furthermore, the evaluation value F can be simply approximated to the actual temperature of the energized component without detecting the actual energization time or calculating the Joule heat.

  As shown in FIG. 7, when evaluation value F exceeds the threshold value at time T (1) (YES in S110), it is determined that the energized component is in a high temperature state, and the input / output power of battery 300 is reduced. WIN and WOUT are changed low so as to limit (S112). Thereby, it can suppress that the temperature of an electricity supply component exceeds allowable temperature, and can protect an electricity supply component appropriately.

  Here, it is assumed that the power supply system is stopped at time T (2) when the energized component is in a high temperature state, and the power supply system is again activated at time T (3) after a short time. .

  In this case, since the system off time TOFF (that is, the time from time T (2) to time T (3)) is short as described above, it is considered that the energized component is still in a high temperature state. Nevertheless, if the evaluation value F that has been calculated taking into account the energization current value and the energization time is cleared as the power supply system is stopped, the initial value of the evaluation value F at the time of restart is the actual value. The value does not correlate with the temperature of the current-carrying parts. Therefore, as shown by the one-dot chain line in FIG. 7, in the initial system operation from time T (3) to time T (4), it takes time until the evaluation value F reaches a value corresponding to the actual temperature of the energized component. Therefore, the power of the battery 300 is not appropriately limited.

  Therefore, when the position of ignition switch 60 is switched to the OFF position at time T (2) (YES in S200), evaluation value F (2) at time T (2) is stored in SRAM 104 while the system is stopped. (S202), a timer is started (S204).

  When the position of ignition switch 60 is switched to the ON position again at time T (3) (YES in S100), the timer is stopped (S302) and system off time TOFF is detected (S304). Based on the evaluation value F (2) stored in the SRAM 104 and the system off time TOFF, an initial value F (3) of the evaluation value F at time T (3) is set (S308).

  The temperature of the energized component is closer to the temperature when the power supply system is stopped as the system off time TOFF is shorter, and decreases as the system off time TOFF is longer. Further, as the temperature of the current-carrying component is longer, the amount of time decrease is smaller as the system stop time is longer.

  The initial value F (3) is set so as to correlate with the temperature of the energized component. Specifically, (F (2) square value) × [{(K−1) / K} TOFF power value] is calculated (S308). Therefore, as the system off time TOFF is shorter, the initial value F (3) is set to a value closer to the evaluation value F (2). As a result, the initial value F (3) can be set to a value correlated with the actual temperature of the energized component.

  As shown in FIG. 7, since evaluation value F (3) exceeds the threshold value (YES in S110), WIN starts from time T (3) when the position of ignition switch 60 is set to the ON position again. And WOUT are changed to low (S112). Therefore, the restriction start time of WIN and WOUT can be made earlier than time T (4) when evaluation value F is cleared at time T (2). Thereby, an electricity supply component can be protected appropriately.

  As described above, according to the control device according to the present embodiment, the evaluation value used for evaluating the temperature state of the energized component is calculated in consideration of the battery current value and the energization time. Thereby, it is possible to appropriately estimate the temperature of the energized component without providing a dedicated temperature sensor or the like. Furthermore, when the power supply system is activated, an initial value of the evaluation value is calculated based on the evaluation value stored in the SRAM when the power supply system is stopped and the system stop time. Thereby, even in the initial stage of operation of the power supply system, the evaluation value can be set to a value correlated with the actual temperature of the energized component. Therefore, the power of the battery can be limited early, and the energized components can be protected appropriately.

  In the present embodiment, the case where the timer 105 is included in the ECU 100 has been described. However, the place where the timer 105 is provided is not limited thereto. For example, the timer 105 may be provided in the monitoring unit 400.

<Second Embodiment>
Hereinafter, a control device according to a second embodiment of the present invention will be described. In the first embodiment described above, the evaluation value F (N) is set to {(K−1) × F (N−1) + (I square value)} / K in the process of S108 in FIG. When calculating, the value of K (hereinafter also referred to as “annealing coefficient K”) was fixed. On the other hand, the control device according to the present embodiment makes the value of the smoothing coefficient K variable according to the increase / decrease of the average value of the battery current value I and the evaluation value F. Other processes are the same as those in the first embodiment. Therefore, detailed description here will not be repeated for the same control block diagram and flowchart as those of the control device of the first embodiment.

  With reference to FIG. 8, a control structure of a program executed when ECU 100 of the control device according to the present embodiment calculates evaluation value F (N) will be described.

  In S400, ECU 100 calculates a time average value (battery current average value) Iave of battery current value I.

  In S402, ECU 100 determines whether or not evaluation value F has increased. For example, the ECU 100 reads the evaluation value F (N-2) calculated last time and the evaluation value F (N-1) calculated last time from the RAM 103, and F (N-1) rather than F (N-2). ) Is large, it is determined that the evaluation value F has increased. If evaluation value F has increased (YES in S402), the process proceeds to S404. Otherwise (NO in S402), the process proceeds to S406.

  In step S404, the ECU 100 refers to the Kr map shown in FIG. The Kr map shown in FIG. 9 is obtained by setting the smoothing coefficient K using the battery current average value Iave as a parameter.

  The actual temperature of the current-carrying component has a characteristic that it rapidly increases when the battery current average value Iave is high and does not increase rapidly when the battery current average value Iave is low. In order to reflect this characteristic in the evaluation value F, in the Kr map shown in FIG. 9, the smoothing coefficient K is a small value (that is, the amount of increase in the evaluation value F per unit time) in a region where the battery current average value Iave is high. Is set to a large value), and is set to a large value (that is, a value that decreases the increase amount of the evaluation value F per unit time) in a region where the battery current average value Iave is low.

  Specifically, the annealing coefficient K is set to the minimum value Kmin in the region where the battery current average value Iave is higher than Iave (2), and gradually increases when the battery current average value Iave is lower than Iave (2). In the region where the battery current average value Iave is lower than Iave (1), the maximum value Krmax is set.

  Here, an example of the Kr map setting method shown in FIG. 9 will be described. As described above, the evaluation value F (N) calculated for the Nth time is calculated by {(K−1) × F (N−1) + (I square value)} / K. When this equation is described in more detail, the following equation 1 is obtained.

  I (N-1) is the battery current value I when the evaluation value F (N-1) is calculated. Note that N indicating the number of times the evaluation value F is calculated can be obtained by dividing the elapsed time from the start of calculation of the evaluation value F by the cycle time (calculation cycle) of the program.

  If the battery current value I is modified as the constant value IBO, the expression shown in the above expression 1 becomes the expression shown in the following expression 2.

The smoothing coefficient K for limiting the evaluation value F (N) so as not to exceed the limit value IBconst ² is obtained by modifying the equation shown in the above equation 2 when the battery current value I is a constant value IBO. It is calculated by the formula shown in FIG. The limit value IBconst ² is a value set in advance based on the allowable temperature of the energized component.

  The Kr map is set to a value obtained by substituting the constant value IBO in the equation shown in Equation 3 with the battery current average value Iave and calculating the smoothing coefficient K.

  Returning to FIG. 8, in S406, the ECU 100 refers to the Kf map shown in FIG. The Kf map shown in FIG. 9 is obtained by setting the smoothing coefficient K using the battery current average value Iave as a parameter, similarly to the Kr map described above.

  In the Kf map shown in FIG. 9, the smoothing coefficient K is set to the same minimum value Kmin as the Kr map in the region where the battery current average value Iave is higher than Iave (2), and the battery current average value Iave is Iave (2). When the average current value Iave is lower than Iave (1), the maximum value Kfmax is set. The maximum value Kfmax of the Kf map is set to a value lower than the maximum value Krmax of the Kr map.

  Returning to FIG. 8, in S <b> 408, ECU 100 calculates evaluation value F (N) based on calculated annealing coefficient K. ECU 100 calculates evaluation value F (N) as {(K−1) × (initial value of evaluation value F) + (square value of I)} / K. That is, the ECU 100 calculates the evaluation value F (N) by the equation shown in the above equation 1.

  An operation of the control device according to the present embodiment based on the above-described structure and flowchart will be described with reference to FIGS. 10 and 11.

  The solid line in FIG. 10 is a timing chart of the evaluation value F (N) when the smoothing coefficient K is made variable by the control device according to the present embodiment. In FIG. 10, the one-dot chain line is a timing chart of the evaluation value F (N) when the annealing coefficient K is fixed at Kmin, and the two-dot chain line is an evaluation value F (N) when K is fixed at Krmax.

  As described above, the evaluation value F (N) is {(K−1) × F (N−1) + (I square value)} / K. Therefore, the smaller the value of the smoothing coefficient K, The increase amount of the evaluation value F (N) per unit time becomes large.

  Therefore, for example, when the smoothing coefficient K is fixed at the minimum value Kmin, as shown by the one-dot chain line in FIG. 10, the increase amount per unit time of the evaluation value F (N) is maintained at a large value. Therefore, there may be a case where the evaluation value F (N) exceeds the threshold value at an early stage even though there is still a time margin until the temperature of the energized component exceeds the allowable temperature. In such a case, even if the current-carrying components can be protected, the output of the motor 30 or the regenerative power of the motor 30 is unnecessarily limited.

  On the other hand, for example, when the smoothing coefficient K is fixed at the maximum value Krmax, the increase amount per unit time of the evaluation value F (N) is maintained at a small value as shown by a two-dot chain line in FIG. Therefore, there is a case where the evaluation value F (N) does not reach the threshold value even though the temperature of the energized component exceeds the allowable temperature. In such a case, the charge / discharge power of the battery 300 is not appropriately limited, and the energized components cannot be protected.

  Therefore, in the present embodiment, the value of the smoothing coefficient K used to calculate the evaluation value F (N) is a variable value corresponding to the battery current average value Iave, as shown in the map of FIG. (S400, S404, S406).

  Thereby, the increase amount per unit time of the evaluation value F (N) is appropriately adjusted according to the battery current average value Iave. Therefore, as shown in FIG. 10, the time until WIN and WOUT are limited (until the evaluation value F (N) exceeds the threshold value) as compared with the case where the smoothing coefficient K is fixed at the minimum value Kmin. Time). As a result, it is possible to avoid unnecessarily limiting the output of the motor 30 or the regenerative power of the motor 30 while protecting the energized components.

  The solid line in FIG. 11 shows the relationship between the time until WOUT is limited and the battery current average value Iave when the smoothing coefficient K is made variable by the control device according to the present embodiment. In FIG. 11, the broken line indicates the time until the temperature of the energized component exceeds the allowable temperature, and the alternate long and short dash line indicates the time until WOUT is limited when the smoothing coefficient K is fixed to the minimum value Kmin. Show.

  As shown in FIG. 11, in Iave (3) where the battery current average value Iave is lower than Iave (2), the control device according to the present embodiment is more effective than the case where the smoothing coefficient K is fixed to the minimum value Kmin. In the case where the annealing coefficient K is made variable, the time until WOUT is limited is prolonged.

  In the Kr map shown in FIG. 9, in the region where the battery current average value Iave is lower than Iave (2), the smoothing coefficient K is set to a value larger than the minimum value Kmin, so that the evaluation value F (N This is because the time until the evaluation value F (N) exceeds the threshold value is prolonged as a result. Thereby, it is possible to avoid limiting the output of the motor 30 unnecessarily.

Further, the Kr map shown in FIG. That is, the smoothing coefficient K calculated based on the Kr map shown in FIG. 9 is set so that the evaluation value F (N) does not exceed the limit value IBconst ² preset based on the allowable temperature of the energized component. ing. Therefore, as shown in FIG. 11, the time until WOUT is limited (solid line) does not exceed the time until the temperature of the energized component exceeds the allowable temperature (dashed line). Therefore, the current-carrying parts can be appropriately protected.

  As described above, in the region where the battery current average value Iave is high, the increase in the evaluation value F per unit time is increased by decreasing the smoothing coefficient K in consideration of the rapid increase in the temperature of the energized components. . On the other hand, in the region where the battery current average value Iave is low, considering the fact that the temperature of the energized component does not increase rapidly, the smoothing coefficient K is increased to decrease the increase amount of the evaluation value F per unit time.

  In this way, the increase amount and the decrease amount per unit time of the evaluation value F can be appropriately adapted to the increase amount and the decrease amount per unit time of the actual energized component temperature. As a result, the evaluation value F can be appropriately approximated to the actual temperature of the current-carrying component, so that the charging / discharging power of the battery 300 can be prevented from being unnecessarily limited while appropriately protecting the current-carrying component. Can do.

  If evaluation value F is decreasing (NO in S402), smoothing coefficient K is calculated with reference to the Kf map instead of the Kr map (S406). As shown in FIG. 9, the Kf map is set to a value lower than the value of the Kr map in the region where the battery current average value Iave is lower than Iave (2).

  As a result, when the evaluation value F is decreased from a state in which the evaluation value F exceeds the threshold value, the amount of decrease in the evaluation value F per unit time can be increased to lower the threshold value earlier than the threshold value. it can. Therefore, the restriction on WOUT can be released early.

  As described above, the control device according to the present embodiment uses the value of the annealing coefficient K used for calculating the evaluation value F used for evaluating the temperature state of the energized component as the battery current average value Iave and the evaluation value F. Change according to the increase or decrease. Therefore, the evaluation value F can be appropriately approximated to the actual temperature of the energized component. As a result, it is possible to prevent the charging / discharging power of the battery from being unnecessarily limited while appropriately protecting the current-carrying components, and to suppress a reduction in the power performance of the vehicle.

<Third Embodiment>
Hereinafter, a control device according to a third embodiment of the present invention will be described. In the first embodiment described above, in the processing of S110 and S112 of FIG. 4, when the evaluation value F exceeds the threshold value, WIN and WOUT are simultaneously decreased, and the decrease amount of WIN and WOUT is evaluated. The value was not related to the value F. In contrast, the control device according to the present embodiment divides the threshold value of evaluation value F into a threshold value for starting WIN decrease and a threshold value for starting WOUT decrease, and decreases WIN and WOUT. The feedback control is performed using the evaluation value F as a parameter. Other processes are the same as those in the first embodiment. Therefore, detailed description here will not be repeated for the same control block diagram and flowchart as those of the control device of the first embodiment.

  With reference to FIG. 12, a control structure of a program executed by ECU 100 which is the control device according to the present embodiment will be described. In the flowchart shown in FIG. 12, the same steps as those in the flowchart shown in FIG. 4 are given the same step numbers. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S500, ECU 100 determines whether or not evaluation value F (N) is greater than threshold value Ftag (1). This threshold value Ftag (1) is a value for starting a decrease in WIN, and is set in advance based on the allowable temperature of the energized component. If evaluation value F (N) is larger than threshold value Ftag (1) (YES in S500), the process proceeds to S502. Otherwise (NO in S500), the process proceeds to S504.

  In S502, ECU 100 changes so as to lower battery charging power limit value WIN based on evaluation value F (N). Specifically, ECU 100 calculates WIN as WIN (S) + Gin × {F (N) −Ftag (1)}. Here, WIN (S) is a value of WIN before the limit, and is a value depending on the temperature of the battery 300 and the SOC. Gin is a feedback gain for calculating the decreased WIN using the evaluation value F (N) as a parameter. In S504, ECU 100 does not change WIN.

  In S506, it is determined whether or not evaluation value F (N) is larger than threshold value Ftag (2). This threshold value Ftag (2) is a value for starting a decrease in WOUT, and is set in advance based on the allowable temperature of the energized component. The threshold value Ftag (2) is set to a value larger than Ftag (1). If evaluation value F (N) is larger than threshold value Ftag (2) (YES in S506), the process proceeds to S508. Otherwise (NO in S506), the process proceeds to S510.

  In S508, ECU 100 changes so as to lower battery discharge power limit value WOUT based on evaluation value F (N). Specifically, ECU 100 calculates WOUT as WOUT (S) + Gout × {F (N) −Ftag (1)}. Here, WOUT (S) is the value of WOUT before the limit, and is a value depending on the temperature of the battery 300 and the SOC. Gout is a feedback gain for calculating the decreased WOUT using the evaluation value F (N) as a parameter. In S510, ECU 100 does not change WOUT.

  The operation of the control device according to the present embodiment based on the above structure and flowchart will be described with reference to FIG.

  When evaluation value F exceeds Ftag (1) at time T (5) (YES in S500), WIN is decreased (S502). At this time, WIN is decreased in proportion to the difference between the evaluation value F (N) and the threshold value Ftag (1).

  When evaluation value F further increases and exceeds Ftag (2) at time T (6) thereafter (YES in S506), WOUT is decreased (S508). At this time, WOUT is decreased in proportion to the difference between the evaluation value F (N) and the threshold value Ftag (1).

In this way, while limiting as the evaluation value F (N) does not exceed the limit value IBconst ² that is set in advance based on such allowable temperature of the current-carrying members, the evaluation value F (N) is the limit value IBconst ² It is possible to minimize the amount of decrease and the decrease rate of WIN and WOUT by shifting the values close to each other. Therefore, it is possible to minimize the reduction amount and the reduction speed of the output of the motor 30 or the regenerative power of the motor 30 while suppressing the temperature of the energized component from exceeding the allowable temperature.

  When evaluation value F decreases below Ftag (2) at time T (7) thereafter (NO in S506), the decrease in WOUT is canceled and WOUT is set to WOUT (S) again (S510). . When evaluation value F falls below Ftag (2) at time T (8) thereafter (NO in S500), the decrease in WIN is canceled and WIN is set to WIN (S) again (S504). .

  As described above, according to the control device according to the present embodiment, the amount of decrease and the decrease rate of WIN and WOUT are subjected to feedback control using the value of evaluation value F as a parameter. Therefore, it is possible to minimize the reduction amount and the reduction speed of the output of the motor 30 or the regenerative power of the motor 30 while suppressing the temperature of the energized component from exceeding the allowable temperature.

  Note that the WIN and WOUT limiting method according to the present embodiment can also be applied to the second embodiment described above.

  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.

It is a figure which shows the structure of the vehicle by which the control apparatus of the power supply system which concerns on the 1st Embodiment of this invention is mounted. It is a figure which shows the structure of the power supply system which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the control apparatus of the power supply system which concerns on the 1st Embodiment of this invention. It is a flowchart (the 1) which shows the control structure of ECU which is a control apparatus of the power supply system which concerns on the 1st Embodiment of this invention. It is a flowchart (the 2) which shows the control structure of ECU which is a control apparatus of the power supply system which concerns on the 1st Embodiment of this invention. It is a flowchart (the 3) which shows the control structure of ECU which is a control apparatus of the power supply system which concerns on the 1st Embodiment of this invention. It is a timing chart which shows the electric power limit value of the battery controlled by the control apparatus of the power supply system which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the control structure of ECU which is a control apparatus of the power supply system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the relationship between the smoothing coefficient K and battery current average value Iave. It is a timing chart of evaluation value F (N) which ECU which is a control device of a power supply system concerning a 2nd embodiment of the present invention computes. It is a figure which shows the relationship between time until battery discharge electric power is restrict | limited, and battery current average value Iave. It is a flowchart which shows the control structure of ECU which is a control apparatus of the power supply system which concerns on the 3rd Embodiment of this invention. It is a timing chart which shows the electric power limit value of the battery controlled by the control apparatus of the power supply system which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

  20 electric vehicle, 22A, 22B drive wheel, 24 differential gear, 26 drive shaft, 30 motor, 32 rotational position detection sensor, 34 inverter, 36 boost converter, 51 shift lever, 52 shift position sensor, 53 accelerator pedal, 54 accelerator pedal Position sensor, 55 brake pedal, 56 brake pedal position sensor, 58 vehicle speed sensor, 60 ignition switch, 100 ECU, 101 CPU, 102 ROM, 103 RAM, 104 SRAM, 105 timer, 110 current value detection unit, 120 evaluation value calculation unit , 130 WIN / WOUT changing unit, 140 system off time detecting unit, 150 evaluation value storing unit, 160 initial value calculating unit, 200 SMR, 210 SMR (1), 220 SMR 2), 230 SMR (3), 212 limiting resistor 300 battery, 310 battery module, 320 service plug, 400 monitoring unit.

Claims (18)

A power supply system control device comprising a power storage mechanism and a component electrically connected to the power storage mechanism,
Detecting means for detecting the current value of the power storage mechanism a plurality of times;
A calculating means for calculating for each unit time by using the evaluation value indicating the temperature of the pre-SL component a calculation formula including a predetermined coefficient,
Limiting means for limiting input / output power of the power storage mechanism when the evaluation value exceeds a threshold value,
The calculating means changes the rate of change of the evaluation value by changing the predetermined coefficient according to at least an average value of the current values detected a plurality of times ,
The calculating means is configured such that when the average value of the current values is a first average value, the predetermined coefficient and the average value of the current values are second average values larger than the first average value. By changing the predetermined coefficient, the rate of change of the evaluation value when the average value of the current value is the first average value, and when the average value of the current value is the second average value A control device that makes the rate of change of the evaluation value smaller than Said calculation means, by the evaluation value in addition to the average value before Symbol electrodeposition current values to change said predetermined coefficient depending on whether is increasing, to change the rate of change in the evaluation value, wherein Item 2. The control device according to Item 1. The calculating means, when the average value before Symbol electrodeposition current values is smaller than a predetermined value, said predetermined when the evaluation value and the predetermined coefficient when the evaluation value is decreasing is increasing by changing the coefficient, the rate of change of the evaluation value is greater than the rate of change in the evaluation value when the evaluation value is increased when the evaluation value is decreasing, claim 2 The control device described in 1. The controller is
Means for storing the evaluation value when the power system is switched from an operating state to a stopped state;
Means for detecting a stop time until the power system is switched from the stop state to the restart state;
A setting means for setting an initial value of the evaluation value based on the stored evaluation value and the stop time when the power supply system is switched to the restarting state after the stop time has elapsed; Including
2. The control device according to claim 1, wherein the calculation unit calculates the evaluation value after the time point when the power supply system is switched from the stop state to the restart state using the initial value. The control device according to claim 4 , wherein the setting unit includes a unit configured to set the initial value closer to the stored evaluation value as the stop time is shorter. The control device according to claim 4 , wherein the setting unit includes a unit for setting the initial value to be larger as the stop time is shorter. In addition to setting the initial value larger as the stop time is shorter, the setting means includes means for setting the initial value smaller while decreasing the decrease rate of the initial value as the stop time is longer. The control device according to claim 6 , further comprising:   The limiting means changes an input / output power limit amount of the power storage mechanism according to a difference between the evaluation value and the threshold value when the evaluation value is larger than the threshold value. The control device described in 1. A power supply system control method comprising a power storage mechanism and a component electrically connected to the power storage mechanism,
A detection step of detecting a current value of the power storage mechanism a plurality of times;
A calculation step of calculating for each unit time evaluation value indicating the temperature of the pre-SL component using a calculation formula including a predetermined coefficient,
A limiting step of limiting input / output power of the power storage mechanism when the evaluation value exceeds a threshold value,
The calculating step includes a step of changing a rate of change of the evaluation value by changing the predetermined coefficient according to at least an average value of the current values detected a plurality of times ,
In the calculating step, when the average value of the current values is a first average value, the predetermined coefficient and the average value of the current values are second average values larger than the first average value. By changing the predetermined coefficient, the rate of change of the evaluation value when the average value of the current value is the first average value, and when the average value of the current value is the second average value A control method including a step of making the change rate smaller than the rate of change of the evaluation value . The calculation step, by which the evaluation value in addition to the average value before Symbol electrodeposition current values to change said predetermined coefficient depending on whether is increasing, to change the rate of change in the evaluation value, wherein Item 10. The control method according to Item 9 . The calculation step, if the average value before Symbol electrodeposition current values is smaller than a predetermined value, said predetermined when the evaluation value and the predetermined coefficient when the evaluation value is decreasing is increasing by changing the coefficient, the rate of change of the evaluation value is greater than the rate of change in the evaluation value when the evaluation value is increased when the evaluation value is decreasing, claim 10 The control method described in 1. The control method is:
Storing the evaluation value when the power supply system is switched from an operating state to a stopped state;
Detecting a stop time until the power supply system is switched from the stop state to the restart state; and
A setting step of setting an initial value of the evaluation value based on the stored evaluation value and the stop time when the power supply system is switched to the restarting state after the stop time has elapsed;
The control method according to claim 9 , wherein the calculating step uses the initial value to calculate the evaluation value after the time point when the power supply system is switched from the stopped state to the reactivated state. The control method according to claim 12 , wherein the setting step includes a step of setting the initial value to be closer to the stored evaluation value as the stop time is shorter. The control method according to claim 12 , wherein the setting step includes a step of setting the initial value to be larger as the stop time is shorter. In addition to setting the initial value larger as the stop time is shorter, the setting step includes a step of setting the initial value smaller while decreasing the decrease rate of the initial value as the stop time is longer. The control method according to claim 14 . Said limiting step, when the evaluation value is greater than the threshold, in accordance with the difference between the evaluation value and the threshold to change the limit of output power of said power storage mechanism, according to claim 9 The control method described in 1. Program for executing the control method according to the computer in any one of claims 9-16. Recording medium for recording a program to be read by a computer to execute a control method in a computer according to any one of claims 9-16.

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