JP2003199211A - Car battery charging and discharging controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the life of a car battery by controlling charging and discharging. <P>SOLUTION: An output limit and a regenerative limit of the battery are set based on a control mode selected by the operation of an operator and the state of charge of the battery, that is, a power mode in which the charging and discharging of the battery are controlled by regarding the driving performance of a motor more important and a long-life mode in which the charging and discharging of the battery are controlled considering to reduce a burden to the battery. The charging and discharging of the battery is controlled in such a way that it does not exceed the preset output and regenerative limits. In the long-life mode, the burden to the battery can be reduced and its life can be extended, by setting the output and regenerative limits to the levels lower than in the power mode. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charge / discharge control device for an automobile, and more particularly to an automobile for controlling charge / discharge of the battery in an automobile equipped with a traveling motor that is rotationally driven by using electric power of the battery. Battery charge / discharge control device.

[0002]

2. Description of the Related Art Conventionally, a battery charge / discharge control device of this type has two control modes, a power mode that emphasizes drive performance of a traveling motor and an economy mode that emphasizes drive efficiency of the traveling motor. Has been proposed (for example, Japanese Patent Laid-Open No. 6-121405). According to this device, the maximum output of the traveling motor is secured or the driving efficiency is improved according to the driver's selection.

[0003]

However, in such a battery charge / discharge control device, the charge / discharge control in consideration of the deterioration rate of the battery is not performed. That is, if the amount of charge and discharge of the battery is increased, the power performance of the motor can be maximized, but the chemical reaction becomes active accordingly, so that the deterioration rate of the battery is accelerated and the life of the battery is shortened. There is.

An object of a battery charge / discharge control device for an automobile of the present invention is to solve the above problems and to provide a device capable of controlling charge / discharge in consideration of the deterioration rate of the battery. Another object of the vehicle battery charge / discharge control device of the present invention is to determine deterioration of the battery.

[0005]

Means for Solving the Problem and Its Action / Effect The battery charge / discharge control device for an automobile of the present invention employs the following means in order to achieve at least a part of the above-mentioned object.

A first vehicle battery charge / discharge control apparatus according to the present invention is a vehicle battery charge / discharge control for controlling the charge / discharge of a battery in a vehicle equipped with a traveling motor that is rotationally driven by using battery power. A control device, charge / discharge control means for controlling charge / discharge of the battery within a rated charge / discharge range of the battery according to a charge amount of the battery, and a rated charge / discharge range of the battery in the charge / discharge control means. A charging / discharging limit control means for controlling charging / discharging of the battery within a narrower range, and a selecting means for selecting execution of the charging / discharging control means and execution of the charging / discharging restriction control means. And

In the first vehicle battery charge / discharge control device of the present invention, the charge / discharge control means controls the charge / discharge of the battery within the rated charge / discharge range of the battery according to the charge / discharge amount of the battery, The charge / discharge limit control means controls the charge / discharge of the battery within a range narrower than the rated charge / discharge range of the battery in the charge / discharge control means. Then, the selection means selects execution of the charge / discharge control means and execution of the charge / discharge restriction control means. As a result, while the charge / discharge limit control unit is being executed, the deterioration rate of the battery can be suppressed and the load on the battery can be reduced, so that the life of the battery can be extended.

A second battery charging / discharging control device for an automobile according to the present invention is a battery charging / discharging device for an automobile, which controls charging / discharging of the battery in an automobile equipped with a traveling motor which is rotationally driven by using electric power of the battery. A charging / discharging control means for controlling charging / discharging of the battery within a range according to the power performance of the vehicle, and a charging / discharging power, temperature, charging / discharging time of the battery rather than the charging / discharging control means. A charge / discharge limit control means for controlling charge / discharge of the battery within a range in which at least one is limited, and a selecting means for selecting execution of the charge / discharge control means and execution of the charge / discharge restriction control means. The main point is to provide.

In the second battery charge / discharge control device for an automobile of the present invention, the charge / discharge control means controls the charge / discharge of the battery within a range according to the power performance of the automobile, and the charge / discharge limit control means is provided. The charge / discharge control means controls charge / discharge of the battery within a range in which at least one of charge / discharge power, temperature, and charge / discharge time of the battery is limited. Then, the selection means selects execution of the charge / discharge control means and execution of the charge / discharge restriction control means. When the charging / discharging power of the battery becomes large, the temperature of the battery becomes high, or the charging / discharging time becomes long, the load on the battery becomes heavier and the deterioration of the battery progresses faster. Therefore, the load on the battery can be reduced by executing the charge / discharge limit control unit that limits at least one of the charge / discharge power, temperature, and charge / discharge time of the battery more than the charge / discharge control unit. It becomes possible to extend the life.

In the battery charge / discharge control device for a vehicle according to the first or second aspect of the present invention, the selecting means executes the charge / discharge control means and the charge / discharge limit control means by an operation of an operator. Can also be a means for selecting.

Further, the first or second battery charge / discharge control device for an automobile according to the present invention further comprises deterioration determining means for determining deterioration of the battery based on at least the execution history of the charge / discharge control means. You can also do it. In this way, it is possible to determine the deterioration of the battery based on at least the execution history of the charging / discharging control means that imposes a heavy burden on the battery.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram showing an outline of a configuration when a vehicle battery charge / discharge control device 20 according to an embodiment of the present invention is applied to an electric vehicle 10. An electric vehicle 10 according to an embodiment includes a battery 12 that can be charged and discharged, and an inverter circuit 14 that converts DC power from the battery 12 into multi-phase AC power (for example, three-phase AC power) by switching a switching element and outputs the multi-phase AC power. , And a motor 16 that receives the polyphase AC power output from the inverter circuit 14 and is driven to rotate. The motor 16 is
The rotating shaft 17 is an axle 19 of a wheel 18 of the electric vehicle 10.
The wheel 18 is rotated by the rotation of the rotating shaft 17 of the motor 16 so that the vehicle can travel. Further, in the embodiment, the motor 16 also serves as a generator, and the braking power is input to the rotating shaft 17 to generate power,
This generated power passes through the inverter circuit 14 and the battery 12
It is supposed to be charged. Although the battery charge / discharge control device 20 is applied to the electric vehicle 10 in the embodiment, the present invention is not limited to the electric vehicle and may be applied to a hybrid vehicle equipped with a motor and an engine.

The battery charge / discharge control device 20 of the embodiment is
A voltage sensor 22 that detects the voltage V of the battery 12 and a current sensor 24 that detects the current I flowing in the battery 12
An electronic control unit 26 that controls the charging and discharging of the battery 12 by controlling the entire battery charge / discharge control device 20 and switching control of the switching elements of the inverter circuit 14, and LE as a display device.
And D28.

The electronic control unit 26 is not shown,
It is configured as a microprocessor centered on a CPU, and includes a ROM that stores a processing program, a RAM that temporarily stores data, and an input / output port.
The battery charge / discharge control device 20 includes a voltage sensor 22.
The voltage V of the battery 12 and the current sensor 2 detected by the
The current I of the battery 12 detected by 4 is input through the input port. Further, the electronic control unit 30 outputs a switching control signal for controlling switching of the switching element of the inverter circuit 14 and L
A lighting signal or the like to the ED 28 is output via the output port.

The operation of the battery charge / discharge control device 20 of the embodiment thus constructed will be described. First, control of charge / discharge of the battery 12 will be described. FIG. 2 is an electronic control unit 2 of the battery charge / discharge control device 20 of the embodiment.
6 is a flowchart showing an example of a charge / discharge control routine executed by S6. This routine is repeatedly executed every predetermined time (for example, every 10 msec).

When the charge / discharge control routine is executed, the CPU of the electronic control unit 26 first executes a process of reading the control mode and the SOC of the battery 12 (step S101). In this control mode, the power mode in which charge / discharge is controlled within the rated output range of the battery 12 with emphasis on the driving performance of the motor 16, and the rated output of the battery 12 is emphasized with emphasis on reducing the load on the battery 12. There is a long life mode that controls the charging and discharging of the battery 12 within a narrow range, and the internal R
A predetermined address of AM is stored. Therefore, the process of reading the control mode is a process of reading the mode stored in the internal RAM. Further, as the charge amount SOC, one which can be directly detected from the battery 12 may be used, but in the embodiment, the SOC value obtained by integrating the current I detected by the current sensor 24 is detected by the voltage sensor 22. S obtained from the relationship between the voltage V and the current I at that time
The value obtained by correcting with the value of OC is stored as SOC in a predetermined address of the internal RAM of the electronic control unit 26. Therefore, the process of reading the charge amount SOC is a process of reading the value stored in the internal RAM.

Next, the read control mode and charge amount SO
Based on C, a process of setting the upper limit of the output that the battery 12 can discharge and the upper limit of the rechargeable battery 12 is performed (step S102). In this embodiment, this process preliminarily sets the relationship between the charge amount SOC of the battery 12 in the power mode and the output upper limit / regeneration upper limit, and the relationship between the charge amount SOC of the battery 12 in the long life mode and the output upper limit / regeneration upper limit in advance. The map is determined and stored in the internal ROM, and when the control mode and the state of charge SOC are given, the corresponding output upper limit and regeneration upper limit are derived from the map. SOC of battery 12 in power mode
3A and an output upper limit and an example of a relationship between the charge amount SOC of the battery 12 and the output upper limit in the long life mode are shown in FIG.
An example of the relationship between the charge amount SOC of No. 2 and the regeneration upper limit and the relationship between the charge amount SOC of the battery 12 and the regeneration upper limit in the long life mode is shown in FIG. In this way, the amount of charge / discharge of the battery 12 in the long life mode is set smaller than the amount of charge / discharge of the battery 12 in the power mode in order to suppress the chemical reaction of the battery 12 and extend the life of the battery 12. is there.

When the output upper limit and the regenerative upper limit are set in this way, the inverter circuit 14 is drive-controlled (within the range from the regenerative upper limit to the output upper limit) so as not to exceed the set output upper limit and regenerative upper limit. (Step S104) This routine is ended. Specifically, the drive control of the inverter circuit 14 is performed when the power required for the motor 16 (including negative power, that is, regenerative power) exceeds the output upper limit and the regenerative upper limit of the battery 12. This can be performed by outputting to the inverter circuit 14 a switching control signal to reduce the power consumed or generated.

Next, the process of determining the deterioration of the battery 12 based on the execution history of the control mode selected by the operation of the operator will be described. FIG. 4 is a flowchart showing an example of a deterioration determination processing routine executed by the electronic control unit 26 of the battery charge / discharge control device 20 of the embodiment. This routine is performed every predetermined time (for example, 10 mse
It is repeatedly executed every c).

When the deterioration determining process routine is executed, the CPU of the electronic control unit 26 first performs the process of reading the above-mentioned control mode (step S200). When the read control mode is the power mode, the counter C is read. Is incremented by 2 (step S202), and when the read control mode is the long life mode, the counter C is incremented by 1 (step S2).
04). The counter C is used to determine the deterioration of the battery 12, and it is determined that the deterioration of the battery 12 progresses as the value of the counter C increases. The value to be added to the counter C is changed according to the control mode when the power mode in which the load on the battery 12 is heavy is used, the battery 12 is accordingly changed.
This is because it is considered that deterioration of the

After that, the value of the counter C changes to the battery 12
It is determined whether or not the value exceeds a value Cref as a threshold value for determining deterioration of the battery (step S206). If the value exceeds the threshold value Cref, it is determined that the battery 12 is deteriorated and the battery 12 is replaced. The lighting signal is output to the LED 28 (step S208), the routine is terminated, and when the voltage is equal to or less than the threshold value Cref, the battery 1
In No. 2, it is judged that it has not deteriorated yet, and this routine is ended without doing anything. This makes it possible to determine the deterioration of the battery 12 according to the control mode selected by the operator.

According to the battery charge / discharge control device 20 of the embodiment described above, the power mode in which the charge / discharge of the battery 12 is controlled by the operation of the operator so that the motor 16 can maximize the driving performance, and the battery The life of the battery 12 can be further improved because the long life mode for controlling the charging / discharging of the battery 12 is switched and controlled so as to reduce the load on the battery 12 and extend its life.

Further, the battery charge / discharge control device 2 of the embodiment
According to 0, when determining the deterioration of the battery 12, the value to be added to the counter C is changed according to the selected control mode, and the deterioration of the battery 12 is determined based on the value of the counter C. The deterioration of the battery 12 can be determined more appropriately according to the charge / discharge control of the battery 12.

In the battery charge / discharge control device 20 of the embodiment, the control mode (power mode, long life mode) selected by the operation of the operator is executed, but the operation mode is not limited to the operation of the operator. When the battery 12 has deteriorated to a certain extent, the power mode may be automatically switched to the long life mode to control the charging and discharging of the battery.

In the battery charge / discharge control device 20 of the embodiment, the deterioration of the battery 12 is determined based on the history of the power mode execution and the history of the long life mode execution. The deterioration of the battery may be determined based only on the history of execution of the power mode, which has a heavy load.

In the battery charge / discharge control device 20 of the embodiment, the range of the output upper limit and the regenerative upper limit of the battery 12 in the long life mode is limited to be narrower than that in the power mode to control the charge / discharge of the battery 12. The charging / discharging power of the battery in the long life mode, the temperature, the charging / discharging time, and the like may be limited to a range smaller than that in the power mode to control the charging / discharging of the battery. The battery charging / discharging power, temperature, and charging / discharging time are restricted to reduce the power consumed or regenerated by the motor when the battery charging / discharging power, temperature, or charging / discharging time exceeds the set range. This is performed by outputting a control signal to the effect to the inverter circuit. Limiting the charge / discharge power and temperature of the battery is as the charge / discharge power of the battery increases.
Also, the higher the battery temperature is, the more the chemical reaction of the battery becomes active, which leads to the shortening of the battery life. Is based on what you do.

Although the embodiments of the present invention have been described with reference to the embodiments, the present invention is not limited to the embodiments of the present invention, and various embodiments are possible without departing from the gist of the present invention. Of course, it can be implemented in.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a configuration when a vehicle battery charge / discharge control device 20 according to an embodiment of the present invention is applied to an electric vehicle 10.

FIG. 2 is a flowchart showing an example of a charge / discharge control routine executed by an electronic control unit 26 of the battery charge / discharge control device 20 of the embodiment.

FIG. 3 is a map showing an example of a relationship between a state of charge SOC of a battery 12 and an output upper limit and a regeneration upper limit in a power mode and a long life mode.

FIG. 4 is a flowchart showing an example of a deterioration determination processing routine executed by an electronic control unit 26 of the battery charge / discharge control device 20 of the embodiment.

[Explanation of symbols]

10 electric vehicle, 12 battery, 14 inverter circuit, 16 motor, 17 rotating shaft, 18 wheels, 19
Axle, 20 battery charge / discharge control device, 22 voltage sensor, 24 current sensor, 26 electronic control unit.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5G003 AA07 BA01 CA01 CA11 CC02                       DA07 EA05 FA06 GC05                 5H030 AA03 AA04 AS08 BB01 BB21                 5H115 PA15 PG04 PI16 PU01 PV09                       QN02 SE06 TI01 TI07 TO05                       TO14 TU16 TU17

Claims (4)

[Claims] 1. A battery charge / discharge control device for an automobile, which controls charging / discharging of the battery in an automobile equipped with a traveling motor that is rotationally driven by using the electric power of the battery, wherein the battery charge / discharge control device responds to a charge amount of the battery. Charge / discharge control means for controlling charge / discharge of the battery within the rated charge / discharge range of the battery, and charge / discharge of the battery within a range narrower than the rated charge / discharge range of the battery in the charge / discharge control means. A battery charge / discharge control device for an automobile, comprising: a charge / discharge limit control means; and a selection means for selecting execution of the charge / discharge control means and execution of the charge / discharge limit control means. 2. A battery charging / discharging control device for an automobile, which controls charging / discharging of the battery in an automobile equipped with a traveling motor rotatably driven by using electric power of the battery, wherein the battery charging / discharging controller responds to power performance of the automobile. Charge / discharge control means for controlling charge / discharge of the battery within a range, and the battery within a range in which at least one of charge / discharge power, temperature, and charge / discharge time of the battery is restricted more than the charge / discharge control means. A battery charge / discharge control device for an automobile, comprising: a charge / discharge limit control unit for controlling charge / discharge of the battery; and a selection unit for selecting execution of the charge / discharge control unit and execution of the charge / discharge limit control unit. 3. The battery charging / discharging control device for an automobile according to claim 1, wherein the selecting means executes the charging / discharging control means and the charging / discharging restriction control means by an operation of an operator. A battery charge / discharge control device for an automobile, which is a means for selecting between and. 4. The battery charge / discharge control device for an automobile according to claim 1, further comprising a deterioration determination unit that determines deterioration of the battery based on at least an execution history of the charge / discharge control unit. Battery charge / discharge control device for automobiles.