JP2005061849A - Characteristic correcting device of current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for constantly and accurately correcting the characteristics of a current sensor. <P>SOLUTION: The device for correcting the characteristics of the current sensor allows a vehicle to drive by both of or either of an engine and a motor, supplies power from a battery to the motor, is used for a hybrid vehicle that drives the generator by the engine and charges the battery, and detects the charge/discharge current of the battery. In the device for correcting the characteristics of the current sensor, the torque of the engine, motor, and generator is controlled, and the characteristics of the current sensor are corrected, based on the output of the current sensor when a plurality of prescribed currents are allowed to flow to the battery. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for correcting offset characteristics, gain characteristics, and drift characteristics of a current sensor.
[0002]
[Prior art]
Create an offset table based on the output value of the current sensor in the no-load state when the ignition is on and the output value of the current sensor in the no-load state when the ignition is off, measured under different temperature and voltage conditions. 2. Description of the Related Art There is known a current sensor characteristic correction device that corrects an output value of a current sensor with reference to an offset table (for example, see Patent Document 1).
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-277520
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional current sensor characteristic correction device, the current sensor output value is corrected using the offset table created based on the past output value of the current sensor. There is a problem that the detection accuracy of the sensor is not taken into account and the correction accuracy is low.
[0005]
[Means for Solving the Problems]
The present invention is used in a hybrid vehicle in which a vehicle is driven by both or one of an engine and an electric motor, power is supplied from the battery to the electric motor, and a generator is driven by the engine to charge the battery. A device for correcting the characteristics of a current sensor that detects charge / discharge current, which controls the torque of the engine, motor and generator, and based on the output of the current sensor when a plurality of different specified currents are passed through the battery. Correct the characteristics.
[0006]
【The invention's effect】
According to the present invention, the characteristics of the current sensor can be accurately corrected at all times even while the vehicle is running.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The purpose of always accurately correcting the characteristics of the current sensor is realized without affecting the state of the apparatus during operation of the apparatus using the current sensor.
[0008]
The invention of the present application is used for a hybrid vehicle in which a vehicle is driven by either or both of an engine and an electric motor, power is supplied from the main battery to the electric motor, and a generator is driven by the engine to charge the main battery. An embodiment applied to a current sensor for detecting a charge / discharge current of a main battery will be described.
[0009]
FIG. 1 shows the configuration of an embodiment. The travel drive circuit 1 drives the generator 3 with the engine 2 to generate power, charges the main battery 4, and supplies the charging power of the main battery 4 and the generated power of the generator 3 to the traveling motor 5. To drive.
[0010]
The generator 3 and the motor 5 are both three-phase alternators, and the AC power from the generator 3 is converted into DC power by the generator inverter 6 and the DC power from the main battery 4 and the generator inverter 6 is converted. Is converted to AC power by the inverter 7 for the motor. The main battery 4 is an assembled battery in which a plurality of cells are connected in series, and supplies high-voltage DC power to a load device such as an inverter 7 for an electric motor.
[0011]
Main relays 8 a and 8 b are provided between the main battery 4 and the inverters 6 and 7, and supply and stop of the high-voltage DC power of the main battery 4 to a load device such as the inverter 7 for an electric motor. The DC / DC converter 9 steps down the high-voltage DC power supply of the main battery 4 and supplies it to the auxiliary battery 10 to charge the auxiliary battery 10.
[0012]
The current sensor 11 detects the charge / discharge current of the main battery 4. In this embodiment, an example in which the offset characteristic, gain characteristic, and drift characteristic of the current sensor 11 are corrected will be described. The voltage sensor 12 detects the terminal voltage of the main battery 4. The current sensor 13 detects the generated current of the generator 3, and the current sensor 14 detects the drive current of the electric motor 5. Further, the temperature sensor 15 detects the temperature near the current sensor 11. The rotation sensor 16 detects the rotation speed of the generator 3, and the rotation sensor 17 detects the rotation speed of the electric motor 5.
[0013]
The battery controller 20 includes a microcomputer 21, a memory 22, a timer 23, a cell voltage detection circuit 24, etc., and controls charging / discharging of the main battery 4 and corrects the characteristics of the current sensor 11. The battery controller 20 is connected to a current sensor 11, a voltage sensor 12, a temperature sensor 15, and the like. The cell voltage detection circuit 24 detects the voltage across each cell constituting the main battery 4.
[0014]
The vehicle controller 30 performs fuel supply control and ignition control of the engine 2 to adjust the rotational speed Ne and torque Te, and controls the inverters 6 and 7 to control the rotational speeds Ng and Nm of the generator 3 and the electric motor 5. Torques Tg and Tm are adjusted. The vehicle controller 30 and the battery controller 20 are connected via a communication line 31 to exchange various information. The vehicle controller 30 is also connected to current sensors 13 and 14, rotation sensors 16 and 17, a warning light 32, and the like.
[0015]
The ignition switch 33 outputs an ignition signal to the microcomputer 21 and the relay 34 of the battery controller 20 when the ignition key is set to the travel position. The relay 34 supplies and stops auxiliary power from the auxiliary battery 10 to the battery controller 20 and the vehicle controller 30 in response to an ignition signal from the ignition switch 33. The auxiliary power supply of the auxiliary battery 10 operates the microcomputer 21 of the battery controller 20, the memory 22, the timer 23, the microcomputer (not shown) of the vehicle controller 30, and the like.
[0016]
FIG. 2 is a flowchart showing the characteristic correction process of the current sensor 11. When the microcomputer 21 of the battery controller 20 receives the ignition signal from the ignition switch 33, the microcomputer 21 starts this characteristic correction process.
[0017]
In step 1, the characteristic abnormality history of the current sensor 11 during the previous run stored in the memory 22 is deleted, and a timer interruption in a characteristic correction routine described later is prohibited. In the subsequent step 2, the output voltage of the current sensor 11 in a no-load state before the main relays 8a and 8b are turned on (closed) is detected, and offset correction is performed so that this output voltage is equivalent to 0A.
[0018]
After the main relays 8a and 8b are turned on in step 3, the process proceeds to step 4 to reset a start timing management timer 23 for a characteristic correction routine which will be described later.
[0019]
In step 5, any abnormality of the offset characteristic, gain characteristic and drift characteristic of the current sensor 11 is detected during the current traveling, and it is confirmed whether or not the abnormality history is stored in the memory 22, and the abnormality history is stored. If YES in step S13, the flow advances to step 13. If no abnormality history is stored, the flow advances to step 7.
[0020]
If any abnormality in the offset, gain, or drift characteristics of the current sensor 11 is detected during the current run, the correction process of the current sensor 11 is stopped in step 13, and the ignition key is then turned on by the ignition switch 33 in step 14. Wait until is turned off. If the ignition key is turned off, the process proceeds to step 15 to execute a shutdown process.
[0021]
In the shutdown process, the charging charges of the DC link capacitors (not shown) of the inverters 6 and 7 are discharged through a resistor, and the main relays 8a and 8b are turned off (opened) when the voltage across the capacitor becomes a predetermined value or less. To do. Thereafter, the relay 34 is turned off (opened), and the supply of auxiliary power from the auxiliary battery 10 to the battery controller 20 and the vehicle controller 30 is stopped.
[0022]
On the other hand, if no abnormalities in the offset, gain, and drift characteristics of the current sensor 11 are detected during the current travel, the current sensor 11 is corrected. In step 6, the temperature sensor 15 detects the temperature near the current sensor 11.
[0023]
Here, a material having a nonlinear temperature characteristic such as a Hall element may be used for the current sensor, and the temperature characteristic of such a current sensor output is nonlinear. FIG. 3 shows the temperature characteristics of the output [V] with respect to the temperature [° C.] near the current sensor 11 when the measured current is 0 [A]. In the current sensor 11, the output [V] exhibits a non-linear temperature characteristic in a region where the vicinity temperature is 0 ° C. or less, and a linear temperature characteristic in a region where the vicinity temperature exceeds 0 ° C.
[0024]
In the linear temperature characteristic region, high correction accuracy can be ensured even if the time interval for correcting the current sensor characteristic is long. On the other hand, in the non-linear temperature characteristic region, if the correction time interval is long, the linear interpolation accuracy is lowered, so that the characteristic correction accuracy is lowered. In this embodiment, when the characteristic of the current sensor 11 is corrected, a specified current is actually passed through the current sensor 11 and correction is performed based on the sensor output at that time. Therefore, it is necessary to perform correction at time intervals that do not affect the driving conditions of the vehicle due to the characteristic correction. In other words, there is a conflicting requirement that the correction time interval is shortened in order to increase the correction accuracy of the current sensor characteristics, and that the correction time interval is lengthened in order to reduce the influence on the driving conditions of the vehicle.
[0025]
In this embodiment, a correction time interval that can suppress the influence of the characteristic correction on the running condition of the vehicle to the minimum while ensuring a sufficient correction accuracy is set. FIG. 4 shows an example of the start timing of each offset, gain, and drift correction routine for the current sensor having the nonlinear temperature characteristic region shown in FIG.
[0026]
The offset correction routine (see FIG. 5), gain correction routine (see FIG. 6), and drift correction routine (see FIG. 7) are all timer interrupt routines. FIG. 4 shows the current sensor correction process shown in FIG. A time [sec] from the start to the start of the timer interrupt routine shown in FIGS. As is clear from FIG. 4, in the non-linear temperature characteristic region where the temperature near the current sensor is 0 ° C. or less, the time until the start of each interrupt routine is short, and conversely, the linear temperature where the temperature near the current sensor is higher than 0 ° C. In such a temperature characteristic region, the time until activation of each interrupt routine is long.
[0027]
In step 8 of FIG. 2, the timer 23 is started, and timer interruption of the offset correction routine, gain correction routine, and drift correction routine is permitted. When the start time of the offset interrupt routine is reached, the process proceeds to step 9 to execute the offset correction routine shown in FIG. Next, when the start time of the gain interruption routine is reached, the routine proceeds to step 10, and the gain correction routine shown in FIG. 6 is executed.
Further, when the start time of the drift correction routine is reached, the routine proceeds to step 11 and the drift correction routine shown in FIG. 7 is executed. These correction routines will be described later.
[0028]
After correcting the characteristics of the current sensor 11 by executing an offset, gain and drift correction routine, it is checked in step 12 whether or not the ignition key is turned off by the ignition switch 33. If the ignition key is not turned off, the process returns to step 4 to repeat the above-described processing. On the other hand, if the ignition key is turned off, the process proceeds to step 15 to execute the above-described shutdown process.
[0029]
Prior to explaining the offset, gain, and drift characteristic correction processing of the current sensor 11, the specified current and its current control will be described. As described above, in this embodiment, a specified current is supplied to the current sensor 11 to measure the offset, gain, and drift characteristics and perform correction. In this embodiment, as shown in FIG. 8, the current when discharging from the main battery 4 to a load device such as the electric motor 5 is positive, and the specified currents (1) to (6) are −5A, + 5A, −15A. , + 15A, -50A, + 50A. Of course, the set number and set value of the specified current are determined according to the specifications and characteristics of the current sensor 11 to be used.
[0030]
FIG. 9 is a flowchart showing a specified current control routine. In step 71, the current flowing from the main battery 4 to the motor 5 and the generator 3, that is, the DC link current Img of the inverters 6 and 7 is calculated by the following equation. The DC link current Img when the main battery 4 is discharged is positive, and the DC link current Img when the main battery 4 is charged is negative.
Img = (Pm−Pg) / Vin (1),
Pm = Tm · Nm · π / 30 + Pmloss (2),
Pg = Tg · Ng · π / 30 + Pgloss (3)
In the above equation, Vin is the DC link voltage of the inverters 6 and 7, and Pm, Tm, and Nm are the output, torque, and rotational speed of the electric motor 5, respectively. Pmloss is a loss of the motor 5 and the inverter 7 for the motor. Pg, Tg, and Ng are the output, torque, and rotational speed of the generator 3. Ploss is a loss of the generator 3 and the inverter 6 for the generator.
[0031]
In step 72, it is confirmed whether or not the specified current Itag is positive, that is, whether or not a discharge current flows from the main battery 4 to the electric motor 5 and the DC / DC converter 9 via the current sensor 11. When the specified current Itag is positive, in steps 73 to 75, the sum (Img + Idcdc) of the DC link current Img of the motor 5 and the generator 3 and the consumption current Idcdc of the DC / DC converter 9 is equal to the specified current Itag. The torque Tm of the electric motor 5 and the torque Te of the engine 2 are controlled.
Img + Idcdc = Itag (4)
Transforming the above equation,
Img = Itag−Idcdc (5)
Since the consumption current Idcdc of the DC / DC converter 9 can be calculated from the operating state of the in-vehicle device that supplies the auxiliary power from the auxiliary battery 10, the DC link current Img calculated by the equation (1) becomes (Itag−Iddcdc). In addition, the motor torque Tm and the engine torque Te are controlled.
[0032]
In step 73, if the DC link current Img is larger than (Itag-Idcdc), the routine proceeds to step 74, where the motor inverter 7 is controlled to reduce the motor torque Tm by a predetermined value α, and the engine 2 is controlled to operate the engine. The torque Te is increased by a predetermined value β. Here, the predetermined values α and β are increments and decrements per execution of the specified current control routine. As described above, the above-described control of the inverter 7 for the motor and the engine 2 is performed by the vehicle controller 30.
[0033]
If the motor torque Tm is reduced, the DC link current Img can be reduced. However, the vehicle driving torque is reduced and the previous driving conditions cannot be maintained. Therefore, by increasing the engine torque Te by an amount corresponding to the reduction in the motor torque Tm, the vehicle driving torque is kept constant and the previous driving conditions are maintained.
[0034]
On the other hand, when the DC link current Img is smaller than (Itag−Idcdc), the routine proceeds to step 75 where the motor torque Tm is increased by a predetermined value α and the engine torque Te is decreased by a predetermined value β. When the electric motor torque Tm is increased, the DC link current Img can be increased. However, the traveling driving torque of the vehicle is increased and the traveling conditions up to that point cannot be maintained. Therefore, by reducing the engine torque Te by an amount corresponding to the increase in the motor torque Tm, the vehicle driving torque is kept constant, and the previous driving conditions are maintained.
[0035]
When the DC link current Img is equal to (Itag−Idcdc), the motor torque Tm and the engine torque Te are not increased or decreased.
[0036]
When the specified current Itag is negative, that is, when the main battery 4 is charged via the current sensor 11, the consumption of the DC / DC converter 9 is calculated from the DC link current Img of the motor 5 and the generator 3 in steps 76 to 78. The torque Tg of the generator 3 is controlled so that the current value (Img−Idcdc) obtained by subtracting the current Idcdc is equal to the specified current Itag.
Img−Idcdc = Itag (6)
Transforming the above equation,
Img = Itag + Idcdc (7)
Since the consumption current Idcdc of the DC / DC converter 9 can be calculated according to the operating state of the in-vehicle device that supplies the auxiliary power from the auxiliary battery 10, the DC link current Img calculated by the equation (1) becomes (Itag + Idcdc). The generator torque Tg and the engine torque Te are controlled.
[0037]
In order to allow the negative specified current Itag to flow through the current sensor 11, power is generated by the generator 3 and the generated power is supplied to the electric motor 5, the DC / DC converter 9 and the main battery 4. The driving power of the electric motor 5 and the power consumption of the DC / DC converter 9 are determined by the running conditions of the vehicle and the operating conditions of the on-vehicle equipment, and these powers cannot be increased or decreased. Therefore, the remainder obtained by subtracting the driving power of the motor 5 and the power consumption of the DC / DC converter 9 from the power generated by the generator 3 becomes the charging power of the main battery 4, and the power generated by the generator 3 is controlled. Thus, the charging current flowing to the main battery 11, that is, the negative specified current Itag of the current sensor 11 can be adjusted to an arbitrary value.
[0038]
When increasing the generated power of the generator 3, the generator torque Tg is increased, and the engine torque Te is increased by the amount corresponding to the increase in the generator torque Tg. Maintain driving conditions. Conversely, when reducing the generated power of the generator 3, the generator torque Tg is reduced, and the engine torque Te is reduced by the reduced amount of the generator torque Tg, thereby eliminating the increase in the vehicle driving torque. And maintain the previous driving conditions.
[0039]
In step 76, if the DC link current Img (Img <0 at this time) is smaller than (Itag + Idcdc) (at this time (Itag + Idcdc) <0), the process proceeds to step 77 to control the generator inverter 6 to generate the generator torque Tg. Is reduced by a predetermined value γ, and the engine torque Te is reduced by a predetermined value δ. Here, the predetermined values γ and δ are increments and decrements per execution of the specified current control routine. As described above, the above-described control of the generator inverter 6 is performed by the vehicle controller 30.
[0040]
On the other hand, when the DC link current Img is larger than (Itag + Idcdc), the routine proceeds to step 78 where the generator torque Tg is increased by a predetermined value γ and the engine torque Te is increased by a predetermined value δ. Note that when the DC link current Img is equal to (Itag + Idcdc), the generator torque Tg and the engine torque Te are not increased or decreased. With the specified current control described above, a specified current can be passed through the current sensor 11.
[0041]
The offset correction process will be described with reference to the offset correction routine shown in FIG.
In step 21, the specified current control routine shown in FIG. 9 described above is executed, and the specified current {circle over (1)} is passed through the current sensor 11. In the subsequent step 22, the output voltage when the specified current (1) is passed through the current sensor 11 is stored in the memory 22. Similarly, in steps 23 to 24, the specified current (2) is supplied to the current sensor 11 and the output voltage is stored in the memory 22.
[0042]
In step 25, as shown in FIG. 10, the output voltage when the specified currents (1) and (2) are passed is linearly interpolated, and the output voltage when the current idc flowing through the current sensor 11 is 0, that is, the offset is obtained. Ask. If this offset is within the preset allowable range, the process proceeds to step 40, where offset correction is performed so that the offset is equivalent to 0A, and the output voltage at the specified currents (1), (2) stored in the memory 22 Erase.
[0043]
On the other hand, if the offset exceeds the allowable range, the warning lamp 32 is turned on in step 27, and then the offset abnormality is stored in the memory 22 in the following step 28, and the specified currents (1) and (2) stored in the memory 22 are stored. The output voltage at ▼ is deleted.
[0044]
The gain correction process will be described with reference to the gain correction routine shown in FIG. In steps 31 to 32, as described above, the specified current {circle over (1)} is supplied to the current sensor 11 and the output voltage is stored in the memory 22. Similarly, in steps 33 to 34, the specified current (2) is supplied to the current sensor 11 and the output voltage is stored in the memory 22. In steps 35 to 36, the specified current (3) is supplied to the current sensor 11 and the output voltage is stored in the memory 22. In steps 37 to 38, the specified current (4) is supplied to the current sensor 11 and the output voltage is stored in the memory 22. In this gain correction process, the output voltage when the specified currents (1) to (4) are passed is subjected to the optimization process based on the offset correction result described above.
[0045]
In step 39, as shown in FIG. 11, the output voltage when the specified currents (1) to (4) are passed is linearly interpolated to obtain a gain (inclination straight line slope). If the gain is within the predetermined allowable range, the process proceeds to step 40 to perform gain correction and erase the output voltage at the specified currents {circle around (1)} to {circle around (4)} stored in the memory 22. In FIG. 11, the gain is within the allowable range unless the interpolation straight line connecting the output voltages when the specified currents (1) to (4) are passed through the predetermined hatched portion. Is determined to exceed the allowable range.
[0046]
On the other hand, if the gain exceeds the allowable range, the warning lamp 32 is turned on in step 41, and then the gain abnormality is stored in the memory 22 in the following step 42, and the specified currents (1) to (4) stored in the memory 22 are stored. The output voltage at ▼ is deleted.
[0047]
The drift correction process will be described with reference to the drift correction routine shown in FIG. In steps 51 to 62, the specified currents (1) to (6) are passed through the current sensor 11 as described above, and the output voltage when each specified current is passed is stored in the memory 22.
[0048]
In step 63, as shown in FIG. 12, linear interpolation is performed based on the output voltage when the specified currents (1) to (6) are passed, and it is confirmed whether or not the interpolation straight line is within a predetermined allowable range. . The interpolation straight line in this case is the one that linearly interpolates the output voltage when the specified currents (5) and (6) are applied to both ends of the straight line obtained by linear interpolation of the specified currents (1) to (4). Interpolated straight line. In this drift correction process, the output voltage when the specified currents (1) to (6) are passed is subjected to the optimization process based on the offset correction result and the gain correction result.
[0049]
In general, since the drift characteristic appears remarkably in a large current region, in this embodiment, as shown in FIG. 12, a drift allowable range is determined in advance for a specified current Itag that exceeds +15 A and a specified current Itag that is less than −15 A. Determine whether the characteristic is normal or abnormal. If the interpolation straight line does not touch the hatched portion, it is determined that the drift is within the allowable range.
[0050]
If the drift is within the allowable range, the process proceeds to step 64 where drift correction is performed and the output voltage at the specified currents (1) to (6) stored in the memory 22 is erased. On the other hand, if the drift exceeds the allowable range, the warning lamp 32 is turned on in step 65, and then in step 66, the drift abnormality is stored in the memory 22 and the specified currents (1) to (6) stored in the memory 22 are stored. The output voltage at ▼ is deleted.
[0051]
As described above, according to the embodiment, the vehicle is driven by the engine 2 and / or the electric motor 5, the electric power is supplied from the main battery 4 to the electric motor 5, and the generator 3 is driven by the engine 2. And a characteristic correction device for a current sensor 11 for detecting a charging / discharging current of the main battery 4, which is used in a hybrid vehicle that charges the main battery 4, without changing the running conditions of the vehicle by the engine 2 and the electric motor 5. Since the torque of the engine 2, the motor 5 and the generator 3 is controlled, the characteristics of the current sensor 11 are corrected based on the output of the current sensor 11 when a plurality of specified currents are passed through the main battery 4. The characteristics of the current sensor can always be accurately corrected even while the vehicle is running.
[0052]
According to one embodiment, when a specified discharge current flows from the main battery 4, if the discharge current is larger than a specified value, the motor torque Tm is decreased and the engine torque Te is increased, so that the discharge current is specified. When the value is smaller than the value, the motor torque Tm is increased and the engine torque Te is decreased. On the other hand, when a specified charging current is supplied to the main battery 4, the generator torque Tg is decreased and the engine torque Te is increased if the charging current is greater than the specified value, and the generator is increased if the charging current is smaller than the specified value. The torque Tg is increased and the engine torque Te is decreased. As a result, the specified charge / discharge current can be passed through the current sensor 11 without increasing or decreasing the vehicle driving torque, and the characteristics of the current sensor 11 can always be accurately corrected even during traveling without changing the vehicle driving conditions. Can do.
[0053]
According to one embodiment, the characteristics of the current sensor 11 are corrected based on the output of the current sensor 11 when a plurality of different, for example, positive and negative specified currents are passed through the current sensor 11. The offset when the current flowing through the capacitor is 0 A can be accurately obtained, and accurate offset correction can be performed.
[0054]
According to one embodiment, since the offset characteristic, the gain characteristic, and the drift characteristic of the current sensor 11 are corrected in this order, the gain characteristic can be corrected using the correction result of the offset characteristic, and the offset characteristic and the gain characteristic can be corrected. Since the drift characteristic can be corrected using the correction result, the characteristic of the current sensor can be corrected more accurately.
[0055]
In one embodiment, the specified currents (1) and (2) are supplied to correct the offset characteristics, and after the offset correction is performed, the specified currents (1) to (4) are supplied to correct the gain characteristics, Although the example in which the specified currents (1) to (6) are further supplied to correct the drift characteristics after the gain correction is shown, the offset characteristics, the gain characteristics, and the drift characteristics are corrected by supplying the specified currents (1) to (6). May be performed at once.
[0056]
According to the embodiment, the number and the region of the specified current are set for each of the offset characteristic, gain characteristic, and drift characteristic of the current sensor 11, so that the characteristics of the current sensor can be quickly obtained with the minimum required current. In addition, it is possible to eliminate the influence of the hysteresis of the current sensor 11 when the correction is performed by supplying a large number of specified currents in a wide range, and an accurate correction can be performed.
[0057]
According to the embodiment, since the time interval for performing the characteristic correction is set according to the temperature characteristic of the current sensor 11, the characteristic correction can be performed accurately even with the current sensor 11 having the non-linear temperature characteristic. .
[0058]
The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the battery controller 20 and the vehicle controller 30 constitute current control means, and the battery controller 20 constitutes characteristic correction means. In addition, unless the characteristic function of this invention is impaired, each component is not limited to the said structure.
[0059]
In the embodiment described above, an example in which the present invention is applied to a hybrid electric vehicle (HEV) has been shown. However, the present invention can be applied to an electric vehicle (EV) and a current sensor used in all electric devices. When applying positive and negative specified currents when applying to an electric vehicle or general electric equipment, the output voltage is measured by supplying multiple specified currents of one polarity to the current sensor, and those output voltages The output voltage at a current of 0 A is estimated by extending the interpolation line, and offset correction is performed using the estimated voltage as an offset. Note that gain correction and drift correction are the same as those in the above-described embodiment.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment.
FIG. 2 is a flowchart illustrating a characteristic correction process of the current sensor according to the embodiment.
FIG. 3 is a diagram illustrating a temperature characteristic of an output voltage with respect to a temperature near a current sensor when a measurement current is 0A.
4 is a diagram showing a start timing of a characteristic correction routine for the current sensor shown in FIG. 3; FIG.
FIG. 5 is a flowchart illustrating an offset correction routine according to an embodiment.
FIG. 6 is a flowchart illustrating a gain correction routine according to one embodiment.
FIG. 7 is a flowchart illustrating a drift correction routine according to an embodiment.
FIG. 8 is a diagram illustrating an example of a specified current for correcting characteristics of the current sensor according to the embodiment;
FIG. 9 is a flowchart illustrating a specified current control routine according to one embodiment.
FIG. 10 is a diagram for describing offset correction processing according to an embodiment;
FIG. 11 is a diagram for describing gain correction processing according to an embodiment;
FIG. 12 is a diagram for explaining drift correction processing according to an embodiment;
[Explanation of symbols]
1 Traveling drive circuit
2 Engine
3 Generator
4 Main battery
5 Electric motor
6 Inverter for generator
7 Inverter for electric motor
8a, 8b Main relay
9 DC / DC converter
10 Auxiliary battery
11 Current sensor
12 Voltage sensor
13, 14 Current sensor
15 Temperature sensor
16, 17 Rotation sensor
20 Battery controller
21 Microcomputer
22 memory
23 Timer
30 Vehicle controller
31 communication line
32 Warning light
33 Ignition switch
34 Relay

Claims (8)

The vehicle is driven by both or one of an engine and an electric motor, power is supplied from the battery to the electric motor, and the electric battery is driven by the engine to charge the battery. A device for correcting the characteristics of a current sensor for detecting a charge / discharge current,
Current control means for controlling the torque of the engine, the electric motor and the generator, and causing a specified current to flow through the battery;
A characteristic correction device for a current sensor, comprising: characteristic correction means for correcting the characteristic of the current sensor based on an output of the current sensor when a plurality of different specified currents are passed by the current control means. In the characteristic correction apparatus of the current sensor according to claim 1,
The current control means controls the torque of the engine, the electric motor, and the generator without changing the running conditions of the vehicle by the engine and the electric motor, and causes a specified current to flow through the battery. Characteristic correction device. In the characteristic correction apparatus of the current sensor according to claim 2,
When the specified discharge current flows from the battery, the current control means decreases the motor torque and increases the engine torque if the discharge current is greater than the specified value, and the discharge current is less than the specified value. In this case, the current sensor characteristic correcting apparatus increases the torque of the electric motor and decreases the torque of the engine. In the characteristic correction apparatus of the current sensor according to claim 2,
When the specified charging current flows to the battery, the current control means decreases the generator torque and increases the engine torque if the charging current is larger than a specified value, and the charging current is less than the specified value. When it is small, the torque of the generator is increased and the torque of the engine is decreased. 5. The current sensor characteristic correction apparatus according to claim 1, wherein the characteristic correction unit is configured to output the current sensor based on an output of the current sensor when a positive / negative specified current is passed by the current control unit. A current sensor characteristic correction apparatus characterized by correcting a characteristic of the current sensor. 6. The current sensor characteristic correction apparatus according to claim 1, wherein the characteristic correction unit corrects the offset characteristic, the gain characteristic, and the drift characteristic of the current sensor in this order. Characteristic correction device. In the current sensor characteristic correction device according to claim 6,
The characteristic correction device for a current sensor, wherein the characteristic correction means sets the number of specified currents and a region for each of the offset characteristic, gain characteristic, and drift characteristic of the current sensor. 8. The current sensor characteristic correction apparatus according to claim 1, wherein the characteristic correction unit sets a time interval for performing characteristic correction according to a temperature characteristic of the current sensor. Current sensor characteristic correction device.

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