JP2002175840A - Deterioration level detection method of battery for vehicle, and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable detection of deterioration level of a battery for vehicle, which is charged by electric power that a dynamo generates, during running of the vehicle to compensate for capacity consumed at starting of the engine of the vehicle, and to detect it in a state with a battery is mounted in the vehicle, as it is. SOLUTION: Actual a real charge capacity of the battery 13 is obtained by an actual charge capacity deducing means 23A from an open circuit voltage of the battery 13 in a balanced state immediately prior to starting of an engine 3, which an open circuit voltage measuring means A measure. An ideal charged capacity is obtained by an ideal charge capacity deducing means 23B, by adding an accumulated charge current supplied from the dynamo 5 during the run of the vehicle, accompanying the starting of the engine 3, which an accumulated charge current deducing means B has been obtained. After the ideal charge capacity deducing means 23B obtains the ideal charge capacity, the ideal charge capacity is compared with the actual charge capacity of the battery 13, obtained by the actual charge capacity deducing means 23A from the open circuit voltage, which is measured by the open circuit voltage measuring means A, by a comparing means 23C, the above degradation degree of the battery 13 is detected, based on the comparison result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the degree of deterioration of an on-vehicle battery charged by electric power generated by a generator while a vehicle is running, in order to supplement the capacity consumed when the engine of the vehicle is started. And its device.

[0002]

2. Description of the Related Art A vehicle-mounted battery mounted on a vehicle is:
Since it is widely used as a power source for starting an engine or operating electric components on a vehicle, it is very important to accurately grasp its charge state.

However, when a battery is repeatedly charged and discharged, a pure resistance, which is an internal impedance, generally increases, and a dischargeable capacity that can be discharged from a fully charged state gradually decreases.

[0004] Therefore, in accurately grasping the state of charge of the battery, it is most important to know the capacity that can be actually supplied. Therefore, it is necessary to accurately grasp the current full charge capacity of the battery. For this purpose, it is recognized as an important issue to recognize the latest deterioration state (deterioration degree) of a battery that affects the full charge capacity itself and deteriorates as charging and discharging are repeated.

[0005] To know the degree of deterioration of the battery, the value of the full charge capacity of the battery at the time of a new battery is previously grasped,
It is necessary to compare this with the current value of the full charge capacity of the battery.Conventionally, the battery is completely discharged from the full charge state, and the discharge current value is multiplied by the discharge time during that time to obtain the discharge current amount. A method is used in which the measured discharge current amount is used as the current value of the full charge capacity of the battery.

[0006]

Incidentally, the present invention is mounted on a vehicle that uses only a general engine as a driving drive source, a hybrid vehicle that uses the power of a motor generator that functions as a motor when the output torque of the engine is insufficient, and the like. In-vehicle batteries, which consume a large amount of capacity mainly when the engine is started, are charged to a fully charged state during driving by electric power generated by a motor generator that functions as an alternator or a generator. .

[0007] Therefore, in these vehicles, when measuring the current value of the full charge capacity of the battery, it is necessary to perform an unrealistic operation of removing the battery from the vehicle and completely discharging the battery from the fully charged state. As a result, there is a problem that it cannot be adopted at all.

[0008] The present invention has been made in view of the above circumstances,
SUMMARY OF THE INVENTION An object of the present invention is to reduce the degree of deterioration of an in-vehicle battery that is charged by electric power generated by a generator while the vehicle is running by removing the battery from the vehicle in order to supplement the capacity consumed when the engine of the vehicle is started. A method for detecting the degree of deterioration of an in-vehicle battery, which can be detected in a state where the battery is mounted on a vehicle, which is based on an unrealistic method of completely discharging from a charged state, and suitable for use in a difference in implementing this method. It is an object of the present invention to provide an in-vehicle battery deterioration degree detecting device.

[0009]

The first and second aspects of the present invention, which achieve the above object, relate to a method of detecting the degree of deterioration of a vehicle-mounted battery, and the third and fourth aspects of the present invention. The present invention relates to an apparatus for detecting the degree of deterioration of a vehicle-mounted battery.

According to a first aspect of the present invention, there is provided a method for detecting the degree of deterioration of an on-vehicle battery, the power generated by a generator while the vehicle is running so as to compensate for the capacity consumed when the engine of the vehicle is started. In detecting the degree of deterioration of the vehicle-mounted battery charged by the battery, every time the engine of the vehicle is started using the electric power from the battery in the equilibrium state, the opening of the battery in the equilibrium state immediately before the start is performed. A circuit voltage is measured, and an actual charge capacity, which is a charge capacity corresponding to an actual charge state of the battery before the start of the engine, is obtained from the open circuit voltage, and each time the vehicle travels with the start of the engine. An integrated charging current obtained by multiplying a current value of a charging current supplied from the generator to the battery by a charging time until the traveling of the vehicle ends,
Ideal charging according to the state of charge of the battery that has been charged during travel of the vehicle by adding to the actual charge capacity obtained immediately before the start of the engine at the start of travel of the vehicle. Determining the ideal charge capacity, which is the capacity, the open circuit measured at the time of starting the engine of the vehicle, which is performed by using the ideal charge capacity and the power from the battery in an equilibrium state after determining the ideal charge capacity. The voltage is compared with one of the charging capacity and the voltage in a uniform dimension, and the degree of deterioration of the battery is detected based on the result of the comparison.

According to a second aspect of the present invention, there is provided the method for detecting the degree of deterioration of a vehicle-mounted battery according to the first aspect of the present invention. If the continuous discharge stop time does not exceed a predetermined time required for depolarization from the maximum polarization occurrence state of the battery charged while the vehicle is traveling, the discharge stop continuous time does not exceed the predetermined time. The continuous discharge stop time is assumed to be that the vehicle is running.

Further, according to a third aspect of the present invention, there is provided an apparatus for detecting the degree of deterioration of an on-vehicle battery, as shown in the basic configuration diagram of FIG. An apparatus for detecting the degree of deterioration of a vehicle-mounted battery 13 charged by electric power generated by a generator 5 while the vehicle is traveling, wherein the battery 1 is in an equilibrium state.
Every time the engine 3 of the vehicle is started using the electric power from the battery 3, the battery 1 in the equilibrium state immediately before the start is started.
Open circuit voltage measuring means A for measuring the open circuit voltage of the engine 3 and the open circuit voltage measured by the open circuit voltage measuring means A according to the actual state of charge of the battery 13 before the engine 3 is started. An actual charging capacity determining means 23A for obtaining an actual charging capacity, which is the charged capacity, and the generator 5 for each time the vehicle travels with the start of the engine 3 until the traveling of the vehicle ends. An integrated charging current determining means B for obtaining an integrated charging current obtained by multiplying a current value of the charging current supplied to the battery 13 by a charging time; and the integrated charging current obtained by the integrating charging current determining means B;
The integrated charging current is added to the actual charging capacity determined by the actual charging capacity determining means 23A at the time of the start of the engine 3 accompanying the start of travel of the vehicle determined by the integrated charging current determining means B. Thus, an ideal charging capacity determining unit 23B for obtaining an ideal charging capacity that is an ideal charging capacity according to a charged state of the battery 13 charged while the vehicle is traveling; Outgoing means 23B
And the open circuit voltage measured by the open circuit voltage measurement means A after the ideal charge capacity is determined by the ideal charge capacity determination means 23B. A comparison unit 23C is provided for comparing one of the voltages with a uniform dimension, and the deterioration degree of the battery 13 is detected based on a comparison result of the comparison unit 23C.

Further, according to a fourth aspect of the present invention, there is provided the on-vehicle battery deterioration degree detecting apparatus according to the third aspect of the present invention, wherein the discharge stop of the battery 13 is continuously stopped. Timekeeping means 2 for measuring time
3D and whether or not the continuous discharge stop time measured by the timer 23D exceeds a predetermined time required for eliminating polarization of the battery 13 charged during traveling of the vehicle from the maximum polarization occurrence state. And the integrated charging current determining means B determines the continuous discharge stop time determined by the continuous time determining means 23E not to exceed the predetermined time. It is assumed that the vehicle is running.

According to the method for detecting the degree of deterioration of a vehicle-mounted battery according to the first aspect of the present invention, the open circuit voltage of the battery in the equilibrium state immediately before the engine of the vehicle is started is determined by the current value of the battery. The value reflects the degree of deterioration and the actual state of charge with respect to the full charge capacity.

Therefore, the actual charge capacity of the battery determined from the open circuit voltage of the battery in the equilibrium state immediately before the engine of the vehicle is started also depends on the actual state of charge of the battery with respect to the current deterioration degree and the full charge capacity. Will be reflected.

On the other hand, during the period from the start to the end of traveling of the vehicle accompanying the start of the engine, the integrated charging current obtained by multiplying the current value of the charging current supplied from the generator to the battery by the charging time is directly added to the actual charging capacity. This means that the current component which is actually converted to the energy of the voltage rise due to the pure resistance of the battery and not stored in the battery is also assumed to be ideally stored as the charging capacity in the battery, The value obtained by adding the integrated charging current to the actual charge capacity is a value reflecting the actual charge state with respect to the full charge capacity in a state where the battery has not deteriorated.

Therefore, the value obtained after the end of traveling of the vehicle,
The value obtained by adding the integrated charging current to the actual charging capacity, and the measured open circuit voltage of the battery in the equilibrium state immediately before the vehicle engine is started, which is measured thereafter, are values reflecting the same charging state. The difference is that one is a value reflecting the ideal state where the battery is not deteriorated, and the other is a value reflecting the current degree of deterioration of the battery.

Further, according to the method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention as set forth in claim 2, the method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention according to claim 1 is characterized in that:
If the continuous discharge stop time of the battery does not exceed the predetermined time, it is assumed that the charge polarization state generated in the battery by the charging during the running of the vehicle before the engine is stopped has not been eliminated before the restart. In addition, the integration of the charging current obtained by multiplying the current value of the charging current supplied from the generator to the battery by the charging time is continued even after the engine is restarted, assuming that the traveling of the vehicle has not ended.

Further, according to the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention, as shown in FIG. Battery 1 in equilibrium just before
The open circuit voltage of 3 is a value reflecting the current degree of deterioration of the battery 13 and the actual state of charge with respect to the full charge capacity.

Therefore, the actual charge capacity of the battery 13 determined by the actual charge capacity determining means 23A from the open circuit voltage of the battery 13 in the equilibrium state immediately before the engine 3 of the vehicle is started is also determined by the current charge of the battery 13. And the actual state of charge with respect to the full charge capacity.

On the other hand, the charging time obtained by the integrated charging current determining means B is calculated by adding the charging time to the current value of the charging current supplied from the generator 5 to the battery 13 from the start to the end of the running of the vehicle upon the start of the engine 3. Is multiplied, the current component that is actually converted to energy of voltage rise due to the pure resistance of the battery 13 and is not stored in the battery 13 is
This is the total amount of charging current when ideally imitating that stored in the battery 13.

Therefore, the integrated charging current determined by the integrated charging current determining means B is actually calculated at the time of starting the engine 3 when the vehicle starts running, which is determined by the integrated charging current determining means B. The ideal charge capacity calculated by the ideal charge capacity calculation means 23B in addition to the actual charge capacity calculated by the charge capacity calculation means 23A reflects the actual charge state with respect to the full charge capacity when the battery 13 is not deteriorated. The ideal value is obtained.

For this reason, the ideal charging capacity determined by the ideal charging capacity determining means 23B after the vehicle has finished traveling and the battery in an equilibrium state measured by the open circuit voltage measuring means A immediately before the start of the engine 3 thereafter. The open circuit voltage of 13 is a value reflecting the same state of charge, while one is a value reflecting an ideal state where the battery 13 is not deteriorated, while the other is a value reflecting the current degree of deterioration of the battery 13. The difference is that the values are the same.

According to the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention as set forth in claim 4, the apparatus for detecting deterioration of a vehicle-mounted battery according to claim 3 of the present invention comprises:
If the continuous time determination unit 23E determines that the continuous discharge stop time of the battery 13 measured by the timer unit 23D does not exceed the predetermined time, the vehicle before the engine 3 stops before the restart is determined. Assuming that the charging polarization state generated in the battery 13 due to the charging during traveling of the vehicle has not been eliminated, the integrated charging current of the charging current obtained by multiplying the current value of the charging current supplied from the generator 5 to the battery 13 by the charging time. The accumulation by the indexing means B is continued even after the restart of the engine 3, assuming that the traveling of the vehicle has not ended.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention, together with a device for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention, will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram showing, in partial blocks, a schematic configuration of an on-vehicle battery deterioration degree detecting apparatus according to an embodiment of the present invention to which the on-vehicle battery deterioration degree detecting method of the present invention is applied. The vehicle battery deterioration degree detection apparatus according to the present embodiment, which is indicated by reference numeral 1 in FIG. 2, is mounted on a hybrid vehicle having a motor generator 5 (corresponding to a generator) in addition to the engine 3.

In this hybrid vehicle, normally, only the output of the engine 3 is transmitted from the drive shaft 7 to the wheels 11 via the differential case 9 to run the vehicle. The motor 5 is configured to function as a motor, and the output of the motor generator 5 is transmitted from the drive shaft 7 to the wheels 11 in addition to the output of the engine 3 to perform assist traveling.

The hybrid vehicle is configured such that the motor generator 5 functions as a generator (generator) at the time of deceleration or braking, and converts the kinetic energy into electric energy to charge the battery 13.

The motor generator 5 is further used as a cell motor for forcibly rotating the flywheel of the engine 3 when the engine 3 starts when the starter switch (not shown) is turned on.

By the way, in the hybrid vehicle of the present embodiment, when a key (not shown) inserted into a key cylinder (not shown) is turned to the first stage, an accessory switch (not shown) which has been turned off until then is turned on. When the key is turned on and the key is further turned to the second stage, the ignition switch (not shown), which was in the off state until then, is turned on while the accessory switch remains in the on state.

Further, when the key inserted into the key cylinder is twisted to the third stage, the starter switch, which has been in the off state, is turned on while the accessory switch and the ignition switch remain in the on state.

When the hand is released from the key twisted up to the third stage, the key automatically returns to the second stage and the starter switch is turned off. At that position, the accessory switch and the ignition switch remain on, and similarly, the key stops at that position and the accessory switch remains on, unless twisted in the opposite direction even at the first stage.

Conversely, when the accessory switch is turned on and then the starter switch is turned on to operate the motor generator 5 as a starter motor to start the engine 3, for example, no other electrical components operate. Even if not, a discharge current that reaches approximately 250 A (ampere) flows from the battery 9 instantaneously.

Returning to the description of the structure, the vehicle battery deterioration degree detecting device 1 of the present embodiment includes a discharge current I of the battery 13 to the motor generator 5 and the like functioning as a motor for assisting traveling and a cell motor, and the like. A current sensor 15 for detecting a charging current for the battery 13 from the motor generator 5 functioning as a generator, and a voltage sensor 17 having an infinite resistance connected in parallel with the battery 13 and detecting a terminal voltage V of the battery 13 are provided. ing.

The above-described current sensor 15 and voltage sensor 17 are arranged on a circuit that is closed when the ignition switch is turned on.

Further, in the apparatus 1 for detecting the degree of deterioration of the vehicle-mounted battery according to the present embodiment, the output of the current sensor 15 and the voltage sensor 17 is A in the interface circuit (hereinafter abbreviated as "I / F") 21. The microcomputer further includes a microcomputer (hereinafter abbreviated as “microcomputer”) 23 that is taken in after the / D conversion, and a nonvolatile memory (hereinafter abbreviated as “NVM”) 25 connected to the microcomputer 23. .

The microcomputer 23 includes a CPU 23
a, a RAM 23b, and a ROM 23c,
The CPU 23a includes a RAM 23b and a ROM 23b.
In addition to 23c, the I / F 21 and the NVM 25 are connected to each other, and a signal indicating the on / off state of the above-mentioned ignition switch (not shown) is input.

The RAM 23b has a data area for storing various data and a work area used for various processing operations. The ROM 23c has a control program for causing the CPU 23a to perform various processing operations, And a voltage-capacity conversion table in which the terminal voltage V detected by the above and the charge capacity of the battery 13 corresponding to the terminal voltage V are stored.

When the ignition switch (not shown) is turned off, the microcomputer 23 enters a sleep mode in which only the minimum necessary processing is performed by the dark current supplied from the battery 13, and wakes up when the ignition switch is turned on. It becomes the normal active mode.

The NVM 25 has a terminal voltage in an equilibrium state of the battery 13 which changes in accordance with a change in charge capacity, that is, a state in which a voltage rise or a voltage drop due to polarization during charge / discharge is completely eliminated and remains. V is the battery 13
Is stored and stored as the open circuit voltage OCV.

Incidentally, at the initial time when the hybrid vehicle is manufactured, the terminal voltage V of the battery 13 separately measured at the time of mounting is stored and stored in the NVM 25 in advance as the open circuit voltage OCV.

Next, a process related to the detection of the degree of deterioration of the battery 13 performed by the CPU 23a according to the control program stored in the ROM 23c will be described with reference to the flowcharts of FIGS.

When the microcomputer 23 is started by receiving power supply from the battery 13 and the program is started, the CPU 23
First, as shown in the flowchart of the main routine in FIG. 3, the operation mode of the microcomputer 23 is set to the sleep mode, the flag of the flag area provided in the work area of the RAM 23b is reset, and the stored value of the timer area is stored. Perform initial settings such as clearing (step S
1) Next, it is confirmed whether or not the measurement time t of the internal wake-up timer has reached the wake-up cycle time T1 (step S2).

The measurement time t is the wake-up period time T1
If it has not reached (N in step S2), the process proceeds to step S7 described below. If it has reached (Y in step S2), the operation mode of the microcomputer 23 is shifted to the active mode (step S3). A circuit voltage update process (step S4) is performed.

In the open circuit voltage updating process in step S4, as shown in the flowchart of the subroutine in FIG. 4, the time stored in the sleep transition time area of the RAM 23b and the current time measured by the internal time counter. Continuous de-energization time T indicated by the difference value from
Is longer than a predetermined time Th required for eliminating polarization from the maximum polarization generation state (step S4).
a).

Here, the continuous non-energization time T is equal to the predetermined time Th.
If it does not exceed (N in step S4a), the open circuit voltage updating process is terminated and the process returns to the main routine of FIG. 3, and if it exceeds (Y in step S4a), the battery 13 detected by the voltage sensor 17 is detected. The A / D conversion value of the terminal voltage V is obtained from the I / F 21 (step S4b).

Subsequently, it is stored in the current area of the NVM 25,
The stored open circuit voltage OCV of the battery 13 is obtained by calculating the terminal voltage V of the battery 13 obtained in step S4b.
/ D conversion value (step S4c), and the RAM 23b
After the flag F in the equilibrium state flag area is set to "1" (step S4d), the open circuit voltage updating process is terminated, and the process returns to the main routine of FIG.

When the open circuit voltage updating process in step S4 is completed, the measurement time t of the internal wake-up timer is reset (step S5), and the operation mode of the microcomputer 23 is returned to the sleep mode (step S5). S6), and return to step S2.

On the other hand, when the measured time t has not reached the wake-up cycle time T1 in step S2 (N)
In step S7, as shown in FIG. 3, an ignition switch (not shown) is turned on, or a switch-on signal generated by turning on an electrical component (not shown) in an on state of an accessory switch (not shown). Wait for input.

If the switch-on signal has not been input (N in step S7), the process returns to step S2. If the switch-on signal has been input (Y in step S7), the operation mode of the microcomputer 23 is changed. After shifting to the active mode (step S8), it is confirmed whether or not a starter switch (not shown) is turned on (step S8).
9).

If the starter switch is not turned on (N in step S9), the process proceeds to step S14 described later. If the starter switch is turned on (Y in step S9), the flag F in the equilibrium state flag area is set to "0". It is confirmed whether or not there is (Step S10), and if it is “0” (Step S10).
If it is not “0” (N in step S10), a deterioration degree detection process (step S11) is performed.

In the process of detecting the degree of deterioration in step S11, as shown in the flowchart of the subroutine in FIG. 5, the voltage-capacity conversion table stored in the ROM 23c is referred to and stored in the previous area of the NVM 25. The value of the charge capacity associated with the voltage value of the open circuit voltage OCV of the battery 13 is extracted (step S11a), and the value of the extracted charge capacity is added to the NVM 25.
The ideal charge capacity value is obtained by adding the integrated charge current value of the battery 13 stored and stored in the integrated value area (step S11b).

Subsequently, referring to the voltage-capacity conversion table stored in the ROM 23c, the charging corresponding to the voltage value of the open circuit voltage OCV of the battery 13 stored and stored in the current area of the NVM 25. The capacity value is extracted (step S11c), and the extracted charge capacity value is divided by the ideal charge capacity value obtained in step S11b to obtain a deterioration degree coefficient (step S11d). The RAM 23 is used for various purposes.
b in the data area (step S).
11e).

Next, the value of the open circuit voltage OCV of the battery 13 stored and stored in the previous area of the NVM 25 is
The value of the open circuit voltage OCV of the battery 13 stored in the current area of the NVM 25 is updated (step S1).
1f), the equilibrium state flag F is set to “0” (step S11g), and the integrated charge current value of the battery 13 stored and stored in the integrated value area of the NVM 25 is reset to zero (step S11h). After the detection process is completed, the process returns to the main routine of FIG.
Proceed to.

At step S10, when the flag F in the equilibrium state flag area is "0" (Y) and after the deterioration degree detection processing at step S12 is completed, step S12 proceeds as shown in FIG. A current sensor 1 for detecting a charging current for a battery 13 from a motor generator 5 functioning as a generator after a starter switch (not shown), which is confirmed in step S9, is turned on.
5 is collected via the I / F 21, and the collected A / D converted value of the current sensor 15 is multiplied by the sampling period of the A / D conversion in the I / F 21 to obtain a charging current amount. .

Next, the charging current amount obtained in step S12 is stored in the integrated charging current area of the NVM 25, added to the stored integrated charging current value, and NVM is added to the added value.
The stored values of the 25 integrated value areas are updated (step S1).
3) Then, the process proceeds to step S14.

In step S10, when the flag F in the equilibrium state flag area is "0" (Y), and in step S14, which proceeds after the deterioration degree detection processing in step S12 is completed, as shown in FIG. It is determined whether or not the input of the switch-on signal is continued. If the input is continued (Y in step S14), the process returns to step S9, and if the input is lost (N in step S14). In the sleep transition time area of the RAM 23b, the current time measured by the internal time counter is stored, and the measurement time t of the internal wake-up timer is reset (step S15).
After the operation mode 3 is set to the sleep mode (step S
16) It is confirmed whether or not the power supply from the battery 13 has been interrupted (step S17).

If the power supply from the battery 13 has not been cut off (N in step S17), the process returns to step S2, and if cut off (Y in step S17), a termination process is performed (step S19). , A series of processing ends.

As is clear from the above description, in the apparatus 1 for detecting the degree of deterioration of a vehicle-mounted battery according to the present embodiment, the voltage sensor 17 and the step S in the flowchart of FIG.
4b constitutes an open-circuit voltage measuring means A in the claims. The current sensor 15 and steps S12 and S13 in the flowchart of FIG.
The integrated charging current determining means B in the claims is constituted.

Further, in the vehicle battery deterioration degree detecting apparatus 1 of the present embodiment, the step S11b in the flowchart of FIG.
B, and corresponds to step S1 in FIG.
1c is a process corresponding to the actual charge capacity determining means 23A in the claims, and is performed in step S11c in FIG.
And step S11d are processing corresponding to the comparing means 23C in the claims.

Further, in the apparatus 1 for detecting the degree of deterioration of the on-vehicle battery according to the present embodiment, the step S15 in FIG.
A clock circuit (not shown) in the U23a constitutes a timer means 23D in the claims, and step S4a in the flowchart of FIG. 4 is processing corresponding to the continuous time determination means 23E in the claims. .

Next, the operation (operation) of the vehicle-mounted battery deterioration degree detecting device 1 of the present embodiment configured as described above will be described.

First, in the off state of the starter switch, while the ignition switch is off and all switches of the electric components (not shown) mounted on the vehicle are off, the time during which the state continues is measured. If the measurement time exceeds a predetermined time Th required for eliminating polarization from the maximum polarization state that can occur in the battery 13, a voltage fluctuation (voltage rise due to polarization that occurred when the battery 13 was charged and discharged last time). Or the voltage drop) is completely eliminated and stored in the NVM 25,
The stored open circuit voltage OCV of the battery 13 is updated to the terminal voltage V of the battery 13 detected before the start of the constant load discharge.

When the starter switch is turned on, the motor generator 5 of the hybrid vehicle operates so as to function as a starter motor, and the engine 3 is started. A charging current amount obtained by multiplying the sampling period of F21 is obtained, and this charging current amount is integrated until the engine 3 is stopped and the ignition switch and the switches of the electrical components are all turned off.

After the ignition switch is turned off and the switches of the electric components (not shown) mounted on the vehicle are all turned off, next, either the ignition switch or the switch of the electric components is turned off. If the time until the switch turns on exceeds the predetermined time Th, then
The charge current amount obtained from the charge current of the battery 13 measured with the start of the engine 3 is not integrated with respect to the integrated value of the charge current amount integrated before the start of the engine 3.

However, after the state where the ignition switch is off and all the switches of the electric components (not shown) mounted on the vehicle are turned off, next, either of the ignition switch and the switch of the electric components is performed. If the time until the battery is turned on does not exceed the predetermined time Th, then the battery 1 measured with the start of the engine 3
The amount of charge current obtained from the charge current of the engine 3 is also the amount of charge current accumulated before the start of the engine 3 until the engine 3 is stopped and the ignition switch and the switches of the electrical components are all turned off. Is integrated for the integrated value of.

Therefore, the integrated value of the charging current amount obtained here is determined so that the battery 13 in the equilibrium state is driven so as to function as a generator with the start of the engine 3 until the next equilibrium state is reached. This is the total amount of the charging current supplied from the motor generator 5 to the battery 13.

Then, after the ignition switch is turned off and the switches of all the electric components (not shown) mounted on the vehicle are turned off, next, either of the ignition switch and the switch of the electric components is performed. If the time until the switch turns on exceeds the predetermined time Th, the NVM2
5, a charge capacity value corresponding to the open circuit voltage OCV of the battery 13 in the equilibrium state before the start of the previous engine 3 stored and stored in the previous area of the engine 3 is calculated, and the accumulated charge value is calculated. The integrated values of the charged current amounts thus obtained are added to obtain an ideal charged capacity value.

At the same time, after the ignition switch is turned off and the switches of the electric components (not shown) mounted on the vehicle are all turned off, next, the ignition switch and the switch of the electric components are connected. If the time until either of them is turned on exceeds a predetermined time Th, NV
The charge capacity value corresponding to the open circuit voltage OCV of the battery 13 in the equilibrium state before the start of the current engine 3 stored and stored in the current area of M25 is calculated.

Here, the charge capacity values corresponding to the open circuit voltage OCV of the battery 13 in the equilibrium state before the previous or current start of the engine 3 are stored and stored in the previous area or the current area of the NVM 25, respectively. The value reflects the degree of deterioration and the actual state of charge with respect to the full charge capacity of the battery 13 before and before the start of the engine 3 this time.

On the other hand, until the battery 13 in the equilibrium state reaches the next equilibrium state, the battery 13 is supplied to the battery 13 from the motor generator 5 driven so as to function as a generator when the engine 3 is started. The sum of the charging current amounts includes a current component that is not actually stored in the battery 13 after being converted into energy of voltage rise due to the pure resistance of the battery 13.

Therefore, the above-mentioned equilibrium state battery is stored in the previous area of the NVM 25 and stored in and stored in the previous area of the battery 13 corresponding to the open circuit voltage OCV of the equilibrium state battery 13 before the previous start of the engine 3. An ideal value obtained by adding the total amount of charging current supplied to the battery 13 from the motor generator 5 driven so as to function as a generator with the start of the engine 3 until the next time when the engine 13 reaches the equilibrium state. The charge capacity value actually assumes that a current component that is converted into energy of voltage rise due to the pure resistance of the battery 13 and is not stored in the battery 13 is ideally stored as a charge current in the battery 13. Therefore, the value reflects the actual charge state with respect to the full charge capacity when the battery 13 is not deteriorated. .

Therefore, the charge capacity value stored and stored in the current area of the NVM 25, which is calculated from the open circuit voltage OCV of the battery 13 in the equilibrium state before the start of the current engine 3, and the ideal charge capacity value described above. Is a value reflecting the current state of deterioration of the battery 13 while the other is a value reflecting the ideal state where the battery 13 is not deteriorated, while reflecting the same state of charge. Will be different.

Therefore, in the vehicle battery deterioration degree detecting apparatus 1 of the present embodiment, the storage degree is stored in the current area of the NVM 25,
The same charge is obtained by dividing the stored charge capacity value determined from the open circuit voltage OCV of the battery 13 in the equilibrium state before the start of the current engine 3 by the ideal charge capacity value obtained as described above. The ratio between the charge capacity value reflecting the current deterioration state in the state and the charge capacity value not reflecting the state is obtained, and this is used as a deterioration degree coefficient indicating the current deterioration degree of the battery 13.

Then, the obtained deterioration coefficient of the battery 13 is provided as data for display and capacity management.

As described above, according to the on-vehicle battery deterioration degree detecting device 1 of the present embodiment, the open circuit voltage OCV in the equilibrium state of the battery 13 immediately before the start of the engine 3 is determined by:
Until the battery 13 in the equilibrium state reaches the next equilibrium state, the sum total of the amount of charging current supplied to the battery 13 from the motor generator 5 driven to function as a generator with the start of the engine 3 , The degree of deterioration of the battery 13 is detected.

For this reason, even if the battery 13 is not removed from the vehicle to be completely discharged from the fully charged state, the battery 13 remains mounted on the vehicle where charging is frequently repeated.
Can be accurately detected.

It is to be noted that the battery 13 after the ignition switch is turned off and the switches of the electric components (not shown) mounted on the vehicle are all turned off,
A method for confirming whether or not the charging polarization generated in the battery 13 is in a state of being eliminated is described in the present embodiment, in which the ignition switch is off and the electrical components (not shown) mounted on the vehicle are not shown. While all the switches are off, it is not necessary to check whether or not the continuous time has exceeded a predetermined time Th required for eliminating polarization from the maximum polarization state that can occur in the battery 13.

However, if this method is adopted, the equilibrium state of the battery 13 can be surely grasped without confirming how much charge polarization is generated in the battery 13 by the electric power supplied from the motor generator. This is advantageous because

Further, in the vehicle-mounted battery deterioration degree detecting device 1 of the present embodiment, the value of the ideal state in which the current deterioration of the battery 13 is not reflected and the actual value in which the current deterioration is reflected are represented by: Although the configuration is such that the charge capacity is unified and compared, the configuration may be such that both are replaced with the open circuit voltage OCV in each state and the comparison is performed.

[0081]

As described above, according to the method for detecting the degree of deterioration of a vehicle-mounted battery according to the first aspect of the present invention,
In order to supplement the capacity consumed when starting the vehicle engine,
In detecting the degree of deterioration of the vehicle-mounted battery charged by the power generated by the generator while the vehicle is running,
Every time the engine of the vehicle is started using the power from the battery in the equilibrium state, an open circuit voltage of the battery in the equilibrium state immediately before the start is measured, and starting of the engine is performed based on the open circuit voltage. An actual charge capacity, which is a charge capacity according to an actual charge state of the battery, is calculated, and every time the vehicle travels with the start of the engine, the generator is operated until the travel of the vehicle ends. By adding an integrated charging current obtained by multiplying the current value of the charging current supplied to the battery by a charging time to the actual charging capacity obtained immediately before the start of the engine at the start of the running of the vehicle, An ideal charge capacity, which is an ideal charge capacity according to the state of charge of the battery charged while the vehicle is running, is determined, and the ideal charge capacity is calculated. Comparing the open circuit voltage measured at the time of starting the engine of the vehicle, which is performed using the power from the battery in a state, with one of a charge capacity and a voltage in a unified manner, , The degree of deterioration of the battery is detected.

Further, according to the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the third aspect of the present invention, the generator is driven while the vehicle is running so as to compensate for the capacity consumed when the engine of the vehicle is started. A device for detecting the degree of deterioration of a vehicle-mounted battery that is charged by electric power generated by the vehicle, wherein each time the engine of the vehicle is started using power from the battery in the equilibrium state, An open circuit voltage measuring means for measuring an open circuit voltage of the battery, and charging based on an actual charge state of the battery before starting the engine from the open circuit voltage measured by the open circuit voltage measuring means. An actual charging capacity determining means for determining an actual charging capacity, which is a capacity, and each time the vehicle travels in response to the start of the engine, the generator is driven by the generator until the traveling of the vehicle ends. An integrated charging current determining means for obtaining an integrated charging current obtained by multiplying a current value of the charging current supplied to the battery by a charging time; the integrated charging current obtained by the integrated charging current determining means; By adding a current to the actual charging capacity determined by the actual charging capacity determining means at the time of starting the engine in accordance with the start of running of the vehicle determined by the integrated charging current determining means, An ideal charging capacity determining means for obtaining an ideal charging capacity that is an ideal charging capacity according to a charged state of the battery charged during the driving, and the ideal charging capacity calculating means determining the ideal charging capacity. The charge capacity and the open circuit voltage measured by the open circuit voltage measurement means after the ideal charge capacity is determined by the ideal charge capacity determination means are defined as the charge capacity and the voltage. While it provided with comparison means for comparing to unify the dimensions or Re and configured to detect the deterioration degree of the battery based on the comparison result of the comparing means.

Therefore, the same charging method can be used by both the method of detecting the degree of deterioration of a vehicle-mounted battery according to the present invention and the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention. Two values relating to the state of the battery are obtained, one being a value reflecting the ideal state without battery deterioration and the other being a value reflecting the current degree of deterioration of the battery, while the value reflects the state. By comparing these two values, it is possible to accurately detect the degree of deterioration of the vehicle-mounted battery that is charged by the power generated by the generator while the vehicle is running, while the battery is mounted on the vehicle.

Further, according to the method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention as set forth in claim 2, in the method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention according to claim 1, The continuous discharge stop time until the restart of the engine is measured, and the continuous discharge stop time exceeds a predetermined time required for eliminating the polarization of the battery charged during running of the vehicle from the maximum polarization occurrence state. When there is no such time, the continuous discharge stop time that does not exceed the predetermined time is assumed to be that the vehicle is running.

According to the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention as set forth in claim 4, in the apparatus for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention as set forth in claim 3,
A timer for measuring a continuous discharge stop time from the stop of the engine to a restart of the engine; and a maximum discharge time of the battery charged during traveling of the vehicle. Continuous time determining means for determining whether or not a predetermined time required for the polarization elimination from the polarization occurrence state is exceeded, and the integrated charging current determining means does not exceed the predetermined time. The discharge stop continuous time determined by the continuous time determination means is recognized as being that the vehicle is running.

Therefore, according to the method for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention described in claim 2, the method for detecting deterioration of a vehicle-mounted battery according to the present invention described in claim 1 is provided. According to the device for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention described in claim 4, in the device for detecting deterioration of a vehicle-mounted battery according to the present invention described in claim 3, any of the above-described methods can generate power while the vehicle is running. The battery equilibrium state can be reliably grasped without checking how much charge polarization is generated by the power supplied from the machine.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a device for detecting the degree of deterioration of a vehicle-mounted battery according to the present invention.

FIG. 2 is an explanatory diagram partially showing a schematic configuration of an on-vehicle battery deterioration degree detecting apparatus according to an embodiment of the present invention to which the on-vehicle battery deterioration degree detecting method of the present invention is applied.

FIG. 3 is a flowchart showing a main routine of a process related to detection of a battery deterioration degree performed by a CPU according to a control program stored in a ROM of the microcomputer of FIG. 2;

FIG. 4 is a flowchart of a subroutine showing an open circuit voltage updating process of FIG. 3;

FIG. 5 is a flowchart of a subroutine showing a deterioration degree detection process of FIG. 3;

[Explanation of symbols]

 3 Engine 5 Generator 13 Battery 23 Microcomputer 23a CPU 23b RAM 23c ROM 23A Actual Charge Capacity Determining Means 23B Ideal Charge Capacity Determining Means 23C Comparison Means 23D Timekeeping Means 23E Continuous Time Determination Means A Open Circuit Voltage Measurement Means B Integrated Charge Current indexing means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomohiro Kawaguchi 1500 Onjuku Yasushi Sogyo Co., Ltd., Susono City, Shizuoka Prefecture (72) Inventor Yoichi Arai 1500 Onjuku 1500 Yasushi Kogyo, Susono City, Shizuoka Prefecture F-term (reference) 2G016 CA03 CB06 CB11 CB12 CB32 CC01 CC03 CC04 CC27 CC28 5G003 AA07 BA01 DA07 EA08 FA06 GC05 5H030 AA00 AS08 FF42 FF44 FF52 5H590 AA01 CA07 CA23 CC01 CE05 EA01 EA05 EA10 FA01 FA05 GB05 HA01 HA02 HA04 J02 JA09 JA09

Claims (4)

[Claims] When detecting the degree of deterioration of a vehicle-mounted battery charged by electric power generated by a generator while the vehicle is running, the vehicle enters an equilibrium state to compensate for the capacity consumed when the vehicle engine is started. Each time the engine of the vehicle is started using power from the certain battery, an open circuit voltage of the battery in an equilibrium state immediately before the start is measured.From the open circuit voltage, the open circuit voltage of the battery before the start of the engine is measured. An actual charge capacity, which is a charge capacity according to an actual charge state of the battery, is obtained. Each time the vehicle travels with the start of the engine, the generator generates the battery from the battery until the travel of the vehicle ends. An integrated charge current obtained by multiplying the current value of the charge current supplied to the vehicle by the charge time is added to the actual charge capacity obtained immediately before the start of the engine when the vehicle starts running. By calculating the ideal charge capacity that is an ideal charge capacity according to the state of charge of the battery charged during the traveling of the vehicle, the ideal charge capacity, and after determining the ideal charge capacity The open circuit voltage measured at the time of starting the engine of the vehicle performed using the power from the battery in an equilibrium state, and comparing the unified dimension to one of the charging capacity and the voltage, and comparing the A method for detecting the degree of deterioration of a vehicle-mounted battery, wherein the degree of deterioration of the battery is detected based on a result of the comparison. 2. A continuous discharge stop time of the battery is measured, and the continuous discharge stop time exceeds a predetermined time required for eliminating polarization of the battery charged during traveling of the vehicle from a maximum polarization generation state. The method of detecting a deterioration degree of a vehicle-mounted battery according to claim 1, wherein when the vehicle is not running, the continuous discharge stop time that does not exceed the predetermined time is assumed to be that the vehicle is running. 3. An apparatus for detecting a degree of deterioration of a vehicle-mounted battery charged by electric power generated by a generator while the vehicle is running, so as to supplement a capacity consumed when an engine of the vehicle is started, Open-circuit voltage measuring means for measuring an open-circuit voltage of the battery in an equilibrium state immediately before the start, each time the engine of the vehicle is started using power from the battery in an equilibrium state; An actual charging capacity determining means for obtaining an actual charging capacity which is a charging capacity corresponding to an actual charging state of the battery before starting the engine from the open circuit voltage measured by the measuring means; Accordingly, each time the vehicle travels, an integrated charging current obtained by multiplying a current value of the charging current supplied from the generator to the battery by a charging time until the traveling of the vehicle ends. Integrated charging current determining means for obtaining the integrated charging current calculated by the integrated charging current determining means, and calculating the integrated charging current with the start of travel of the vehicle determined by the integrated charging current determining means. By adding to the actual charge capacity obtained by the actual charge capacity determining means at the time of starting the engine, an ideal charge state corresponding to the state of charge of the battery charged during traveling of the vehicle is calculated. An ideal charging capacity calculating means for calculating an ideal charging capacity which is a charging capacity; an ideal charging capacity calculated by the ideal charging capacity calculating means; and an ideal charging capacity calculated by the ideal charging capacity calculating means. And comparing means for comparing the open circuit voltage measured by the open circuit voltage measuring means to one of a charging capacity and a voltage in a uniform dimension. Comparing detects a deterioration degree of the battery based on the result, the in-vehicle battery deterioration degree detecting device, characterized in that the. 4. A timer means for measuring a continuous time period for stopping the discharging of the battery, and the continuous time period for stopping the discharging measured by the time measuring means is determined from a maximum polarization state of the battery charged while the vehicle is running. Continuous time determining means for determining whether or not a predetermined time required for depolarization has been exceeded, wherein the integrated charging current determining means determines that the continuous time determining means has not exceeded the predetermined time. The degradation detection device for a vehicle-mounted battery according to claim 3, wherein the controller determines that the continuous discharge suspension time determined by the controller is determined to be running.