JP2009213335A - Generator controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator controller that hardly depends on conditions and can quickly and stably respond under broader conditions. <P>SOLUTION: The generator controller allows the power generation voltage value of the generator to be a target voltage value by controlling the magnetic field of the generator, wherein (1) if the rotational frequency of an engine or the generator is larger, a proportional gain used for control is lessened than a case where it is small, (2) if the current value of load current is larger, the proportional gain used for control is lessened than a case where the load current is small, and (3) if the field current or field voltage is larger, the proportional gain used for control is more increased than a case where it is small. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a generator control device that controls a field of a generator to set a generated voltage value of the generator as a target voltage value.

Conventionally, when controlling the generator, by controlling the field of the generator based on PI control, for example, the control output to the field winding of the generator is calculated by PI control, and the control output is 2. Description of the Related Art A generator control device that uses a generated voltage value of a generator as a target voltage value by supplying it to a field winding is known (see, for example, Patent Document 1).
JP-A-5-176476

  The above-described conventional generator control device has a logic that can change the proportional gain and the integral gain according to conditions so as to respond quickly and stably regardless of the conditions. For example, in accordance with the rotational speed of the generator, the proportional gain and the integral gain are changed so that when the rotational speed is large, it is larger than when the rotational speed is small. As described above, since the proportional gain and the integral gain are increased as the rotational speed is increased, there is a problem that the response is likely to be slow at low speed and the response is likely to be unstable at high speed.

  An object of the present invention is to solve the above-described problems, and to provide a generator control device that is less affected by conditions and can respond quickly and stably over a wide range of conditions.

  A generator control device according to a first aspect of the present invention is a generator control device that controls a field of a generator to set a generator voltage value of the generator as a target voltage value. Is larger, the proportional gain used for the control is made smaller than when the engine or generator has a smaller number of revolutions. As a preferred embodiment, the proportional gain and the integral gain used for the control may be changed so as to decrease as the rotational speed increases, depending on the rotational speed of the engine or the generator.

  The generator control device according to the second invention of the present invention is a generator control device that controls the field of the generator to set the generator voltage value of the generator as a target voltage value. Is larger, the proportional gain used for the control is smaller than when the load current is small. As a preferred embodiment, the proportional gain and integral gain used for the control may be changed so that the larger the current value is, the smaller the current value is, depending on the current value of the load current.

  Furthermore, the generator control device according to the third aspect of the present invention is a generator control device that controls the field of the generator so that the generator voltage value of the generator is a target voltage value. When the magnetic voltage is large, the proportional gain used for the control is increased as compared with the case where the field current or the field voltage is small. As a preferred embodiment, the proportional gain and integral gain used for the control are set so that the larger the current value or voltage value is, the larger the current value or voltage value is, according to the current value or voltage value of the field current or field voltage. May change.

  Furthermore, the generator control device according to the fourth aspect of the present invention is the generator control device that controls the field of the generator to set the generator voltage value of the generator as a target voltage value. (1) Engine Or, when the rotational speed of the generator is large, the proportional gain used for control is made smaller than when the rotational speed of the engine or generator is small, and (2) when the current value of the load current is large , Reducing the proportional gain used for control compared to when the load current is small, and (3) when the field current or field voltage is large, compared to when the field current or field voltage is small, The proportional gain used for control is increased.

  In the present invention, (1) when the rotation speed of the engine or generator is large, the proportional gain used for control is made smaller than when the rotation speed of the engine or generator is small, and / or (2) When the current value of the load current is large, the proportional gain used for control is made smaller than when the load current is small, and / or (3) when the field current or field voltage is large, By increasing the proportional gain used for control compared to when the magnetic current or field voltage is small, it is possible to obtain a generator control device that is less affected by conditions and can respond quickly and stably over a wide range of conditions.

  Hereinafter, embodiments of the generator control device of the present invention will be described with reference to the drawings.

<About a four-wheel drive vehicle to which the generator control device of the present invention can be preferably applied>
FIG. 1 is a view for explaining an example of a four-wheel drive vehicle to which the generator control device of the present invention can be suitably applied. In the example shown in FIG. 1, the left and right front wheels 1 </ b> L and 1 </ b> R are main drive wheels that are driven by the engine 2 that is an internal combustion engine, and the left and right rear wheels 3 </ b> L and 3R are slave drive wheels that can be driven by the motor 4.

  The output torque Te of the engine 2 is transmitted to the left and right front wheels 1L, 1R through the transmission and the reference gear 5. Further, a part of the output torque Te of the engine 2 is transmitted to the generator 7 via the endless belt 6, so that the generator 7 has a rotation speed Ng obtained by multiplying the rotation speed Ne of the engine 2 by the pulley ratio. Rotate. The generator 7 becomes a load on the engine 2 in accordance with the field current Ifg adjusted by the 4WD controller 8, and generates power in accordance with the load torque. The magnitude of the power generated by the generator 7 is determined by the magnitude of the rotational speed Ng and the field current Ifg. The rotational speed Ng of the generator 7 can be calculated from the rotational speed Ne of the engine 2 based on the pulley ratio. The electric power generated by the generator 7 can be supplied to the motor 4 via the inverter 9. The drive shaft of the motor 4 can be connected to the rear wheels 3L and 3R via the speed reducer 11 and the clutch 12. The motor 4 in this example is an AC motor. Moreover, the code | symbol 13 in a figure shows a difference gear.

  Each wheel 1L, 1R, 3L, 3R is provided with a wheel speed sensor 27FL, 27FR, 27RL, 27RR. Each wheel speed sensor 27FL, 27FR, 27RL, 27RR outputs a pulse signal corresponding to the rotation speed of the corresponding wheel 1L, 1R, 3L, 3R to the 4WD controller 8 as a wheel speed detection value. The 4WD controller 8 includes an arithmetic processing unit such as a microcomputer, for example. The wheel speed signal detected by each of the wheel speed sensors 27FL to 27RR, the output signal of the resolver connected to the motor 4, and the depression amount of the accelerator pedal Information such as the accelerator opening corresponding to is input.

  FIG. 2 is a circuit diagram for explaining an example of field control in the generator 7. In the example shown in FIG. 2, 7a is an armature coil of the generator 7, 7b is a field coil, 7c is a switching element, and 7d is a battery. Then, by controlling the field current Ifg flowing through the field coil 7b based on the PI control, the summer value Vg is controlled to be the target voltage value by the power generation of the generator 7.

  In the above-described example, the example in which the generator control device of the present invention is applied to a four-wheel drive vehicle has been shown, but it goes without saying that the generator control device of the present invention can also be applied to other generators.

<Description of Generator Control Device of the Present Invention>
Hereafter, the characteristic part of the generator control apparatus of this invention is demonstrated. 3-5 is a figure for demonstrating the concept of an example of the generator control apparatus of this invention, respectively. Here, when changing the proportional gain and integral gain used for PI control (feedback control), the example shown in FIG. 3 examines the rotation speed of the engine or generator, and the example shown in FIG. An example in which the value is examined, and the example shown in FIG. 5 shows an example in which the current value of the field current or the voltage value of the field voltage is examined.

<Description of the first invention>
In the example shown in FIG. 3, when comparing the curve when the rotation speed is large and the curve when the rotation speed is small, the voltage changes as the rotation speed increases for the same field current change. It turns out that it is easy (in other words, it changes a lot). At this time, a control is considered in which the proportional gain and the integral gain are changed so as to decrease as the rotational speed increases (in other words, to decrease the gain). When this control is performed, when the rotational speed is large, the proportional gain and the integral gain become small, and the amount of change in voltage with respect to the same field current becomes small. As a result, when this control is performed, variations in voltage change are reduced even if the rotational speed is changed.

<Description of the second invention>
In the example shown in FIG. 4, when the curve when the field is large is compared with the curve when the field is small, the voltage is likely to change as the load current increases (in other words, changes greatly). I understand. At this time, a control is considered in which the proportional gain and the integral gain are changed so that the larger the load current, the smaller the load current (in other words, the lower the gain). When this control is performed, when the load current is large, the proportional gain and the integral gain become small, and the amount of change in the field becomes small regardless of the load current. As a result, when this control is performed, even if the load current changes, the variation in the field change is reduced.

<Description of the third invention>
In the example shown in FIG. 5, when the field curve is examined, it can be seen that the voltage is less likely to change (in other words, the change is small) as the field increases with respect to the same field change amount. At this time, a control is considered in which the proportional gain and the integral gain are changed so as to increase as the field increases (in other words, increase the gain). When this control is performed, the proportional gain and integral gain increase when the field (field voltage or field current) is large, and variations in voltage change are reduced even when the field changes.

  In the generator control device of the present invention shown in FIGS. 3 to 5, conditions such as the rotational speed (first invention), load current (second invention), field current or field voltage (third invention) change. However, it becomes difficult to be influenced by those conditions, and it becomes possible to respond quickly and stably in a wide range of conditions. In the example described above, the proportional gain and integral gain are changed by using the conditions of the rotation speed (FIG. 3), load current (FIG. 4), field current or field voltage (FIG. 5) independently. However, it is also possible to change the proportional gain and the integral gain using all these three conditions (fourth invention). In this way, in the fourth invention in which the proportional gain and the integral gain are changed using all three conditions, the PI control accuracy is further improved as compared with any one of the first to third inventions. Can be made.

  FIG. 6 is a block diagram for explaining an example of the generator control device of the present invention. In the example shown in FIG. 6, 31 is an engine, 32 is a generator, 33 is a load, 34 is a comparator, 35 is a PI control calculation unit, and 36 is a DUTY calculation unit. is there. A feature of the generator control device of the present invention is that a gain calculation unit 37 for changing a proportional gain and an integral gain is provided in the PI control calculation unit 35. In the example shown in FIG. 6, a difference ΔV between the generated voltage of the generator 32 and the target voltage is obtained by the comparator 34. The obtained difference ΔV is controlled by the PI control calculation unit 35 to obtain a control output that becomes the target field voltage. Then, the calculated control output is calculated by the DUTY calculation unit 36 to determine the field DUTY. The determined field DUTY is supplied to the field coil of the generator 32 to control the generator 32.

  Here, the proportional term Vfp of proportional control in the PI control calculation unit 35 is Vfp = Kp × ΔV (Kp: proportional gain), and the integral term Vfi of integral control is Vfi = Ki × ΔV × Δt + Vfiz (Ki: integral gain, Vfiz: integration previous value). These proportional gain Kp and integral gain Ki are used to measure or estimate the rotational speed of the engine or generator, load current value, field current value or field voltage value, and calculate a coefficient for correcting the gain, respectively. The point which correct | amends with a coefficient becomes the characteristic of this invention.

  FIG. 7 is a block diagram for explaining an example of the gain calculation unit 37 in the generator control device of the present invention. In the example shown in FIG. 7, a gain correction coefficient K1 for the rotation speed is obtained from the relationship between the rotation speed and the gain correction coefficient K1, and a gain correction coefficient K2 for the load current is obtained from the relationship between the load current and the gain correction coefficient K2. A gain correction coefficient K3 for the field is obtained from the relationship between the magnetic voltage or field current and the gain correction coefficient K3. Here, the relationship between the rotational speed and the gain correction coefficient K1 is such that the larger the rotational speed, the smaller the gain correction coefficient K1. The larger the load current, the larger the load current, the greater the gain. The correction coefficient K2 becomes smaller, and the relationship between the field and the gain correction coefficient K3 is such that the larger the field, the larger the gain correction coefficient K3. Then, the gain K used for control is obtained from K = Kb * K1 * K2 * K3 by using the gain correction coefficients K1, K2, and K3 for the basic gain Kb. Actually, correction using the above-described gain correction coefficients K1 to K3 is performed on each of the proportional gain Kp and the integral gain Ki.

  According to the generator control device of the present invention, (1) depending on the number of revolutions of the engine or generator, the larger the number of revolutions, and / or (2) the current value of the load current. Accordingly, the larger the current value, the smaller the current value and / or (3) the larger the current value or voltage value, the larger the current value or voltage value depending on the current value or voltage value of the field current or field voltage. Therefore, by changing the proportional gain and integral gain used for PI control, it is less affected by conditions and can respond quickly and stably over a wide range of conditions. Therefore, it can be suitably used as a generator control device for generators having various configurations.

It is a figure for demonstrating an example of the four-wheel drive vehicle which can apply the generator control apparatus of this invention suitably. It is a circuit diagram for demonstrating an example of the field control in a generator. It is a figure for demonstrating the concept of an example of the generator control apparatus of this invention. It is a figure for demonstrating the concept of the other example of the generator control apparatus of this invention. It is a figure for demonstrating the concept of the further another example of the generator control apparatus of this invention. It is a block diagram for demonstrating an example of the generator control apparatus of this invention. It is a block diagram for demonstrating an example of the gain calculating part in the generator control apparatus of this invention.

Explanation of symbols

1L, 1R Front wheel 2 Engine 3L, 3R Rear wheel 4 Motor 6 Belt 7 Generator 8 4WD controller 9 Inverter 11 Reducer 12 Clutch 27FL, 27FR, 27RL, 27RR Wheel speed sensor 31 Engine 32 Generator 33 Load 34 Comparator 35 PI Control calculation section 36 DUTY calculation section 37 Gain calculation section

Claims (7)

  In the generator control device that controls the generator field to set the generator voltage value to the target voltage value, when the engine or generator speed is high, the engine or generator speed is A generator control device characterized in that a proportional gain used for control is reduced as compared with a small case.   2. The generator control device according to claim 1, wherein a proportional gain and an integral gain used for the control are changed in accordance with a rotational speed of the engine or the generator so that the larger the rotational speed is, the smaller the speed is. A generator control device characterized by that.   By controlling the generator field, in the generator control device that sets the generator voltage value to the target voltage value, the control is more effective when the load current is large compared to when the load current is small. A generator control device characterized by reducing a proportional gain to be used.   4. The generator control device according to claim 3, wherein a proportional gain and an integral gain used for the control are changed in accordance with a current value of the load current so that the larger the current value is, the smaller the current value is. A generator control device.   In the generator control device that controls the generator field to set the generator voltage value to the target voltage value, if the field current or field voltage is large, the field current or field voltage is A generator control device characterized in that a proportional gain used for control is increased as compared with a case where it is small.   6. The generator control device according to claim 5, wherein the control is performed so that the larger the current value or voltage value is, the larger the current value or voltage value is, according to the current value or voltage value of the field current or field voltage. A generator control device characterized by changing a proportional gain and an integral gain to be used.   In the generator control device that controls the generator field to set the generator voltage value to the target voltage value, (1) when the engine or generator speed is high, the engine or generator Decrease the proportional gain used for control compared to when the rotational speed is small, and (2) reduce the proportional gain used for control when the current value of the load current is large compared to when the load current is small. And (3) a generator control characterized in that, when the field current or field voltage is large, the proportional gain used for control is increased compared to when the field current or field voltage is small. apparatus.

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