JP2021184665A - Vehicle power generation control device - Google Patents

Abstract

To provide a vehicle power generation control device capable of securing long-term reliability of a vehicle field winding generator by suppressing the maximum temperature of the vehicle field winding generator itself such that a component does not exceed a heat resistance allowable temperature.SOLUTION: A vehicle power generation control device includes: a switching element for limiting a field current of a vehicle generator of a field winding method; a rotation speed detection circuit for detecting rotation speed of the vehicle generator; a rotation speed range detection circuit for detecting whether or not the rotation speed is within a range of predetermined rotation speed; a field current limit determination circuit for determining whether or not limiting of the field current is necessary; and an open/close energization ratio limit value setting circuit for setting an open/close energization ratio limit value for adjusting an open/close energization ratio of the switching element. The vehicle power generation control device adjusts the open/close energization ratio of the switching element in a rotation speed range in which a temperature of a component of the vehicle generator increases, and can prevent the temperature of the component from exceeding a heat resistance allowable temperature by limiting the field current.SELECTED DRAWING: Figure 1

Description

The present application relates to a vehicle power generation control device.

In passenger cars, trucks and other vehicles, power consumption is increasing due to the installation of devices related to autonomous driving for the purpose of reducing the burden on the driver. Accordingly, the power generation output required for the on-board field winding type vehicle generator also increases, and it is necessary to increase the power generation output particularly in the low speed rotation region.

Furthermore, in order to improve the fuel efficiency of the vehicle, add various equipment, and secure a comfortable interior space, the space inside the engine room is narrowed, and the surrounding atmosphere where the field winding type vehicle generator is installed accordingly. The temperature rises. In addition, by increasing the power generation output, the self-heating of the field winding type vehicle generator itself also increases, and as a result, the temperature of the components of the field winding type vehicle generator is heat resistant. The problem arises that the temperature is exceeded and the long-term reliability is reduced.

On the other hand, for example, in the vehicle power generation control device of Patent Document 1, when the field winding type vehicle generator exceeds the threshold value of the rotation speed, the field current is suppressed and the maximum rating at high speed rotation is achieved. It is described that the wiring on the vehicle side is protected by limiting the generated current.

Japanese Unexamined Patent Publication No. 2013-172630

However, the temperature of the field winding type vehicle generator (hereinafter referred to as vehicle generator) itself becomes the highest not at high speed rotation where the power generation output becomes the maximum current, but at the vehicle generator. Due to the relationship between self-heating due to loss during power generation and the cooling capacity of the fan inside the vehicle generator, the temperature of the vehicle generator is the highest, for example, in the range of 2,000 rpm to 3,000 rpm. It gets higher. When the field current is suppressed so as to reduce the power generation output at the rotation speed at which the temperature of the vehicle generator itself becomes the highest, as in the vehicle power generation control device of Patent Document 1, the cooling capacity is sufficient as a vehicle generator. There are problems that the power generation output in a certain rotation region is insufficient, and the limit amount of the maximum rated power generation current at the time of high-speed rotation is excessive or insufficient.

This application has been made to solve the above-mentioned problems, suppresses the maximum temperature of the field winding type vehicle generator itself, and does not exceed the heat resistance allowable temperature of the component parts of the vehicle generator. By doing so, it is an object of the present invention to provide a vehicle power generation control device capable of ensuring the long-term reliability of the vehicle generator.

The first vehicle power generation control device disclosed in the present application includes a switching element that limits the field current of a field winding type vehicle generator, and a rotation speed detection that detects the rotation speed of the vehicle generator. A circuit, a rotation speed range detection circuit that detects whether or not the rotation speed is within a predetermined rotation speed range, a field current limit determination circuit that determines whether or not the field current is limited, and the switching element. It is provided with a limit value setting circuit for setting an open / close current ratio limit value in order to adjust the open / close current ratio, and a certain period of time after the detection that the rotation speed is within the predetermined rotation speed range is provided. Later, the open / close energization ratio limit value is set so that the open / close energization ratio becomes 100% or less, and the open / close energization ratio is adjusted within the range of the open / close energization ratio limit value to control the field current. Further, after it is detected that the rotation speed is out of the predetermined rotation speed range, the open / close energization ratio limit value is released after a certain period of time, and the open / close energization ratio is adjusted to 100%. It is characterized by controlling the field current.

Further, the second vehicle power generation control device includes a switching element that limits the field current of the field winding type vehicle generator, a rotation speed detection circuit that detects the rotation speed of the vehicle generator, and a rotation speed detection circuit. The field current detection circuit that detects the field current, the rotation speed range detection circuit that detects whether or not the rotation speed is within a predetermined rotation speed range, and the necessity of limiting the field current are determined. The field current limit determination circuit and the limit value setting circuit for setting the field current limit value for adjusting the field current are provided, and the rotation speed may be within the predetermined rotation speed range. After a certain period of time after the detection, the field current limit value is set, and within the range of the field current limit value, the switching energization ratio of the switching element is adjusted to control the field current. Further, after it is detected that the rotation speed is out of the predetermined rotation speed range, the field current limit value is released after a certain time, and the open / close energization ratio is adjusted to 100%. , The field current is controlled.

According to the vehicle power generation control device disclosed in the present application, the temperature is configured by limiting the field current at the rotation speed at which the temperature of the component of the vehicle generator becomes high based on the detected rotation speed. It is possible to prevent the heat resistance allowable temperature of the parts from being exceeded, which has the effect of ensuring the long-term reliability of the vehicle generator.

It is a figure which shows the schematic structure of the vehicle power generation system including the vehicle power generation control device which concerns on Embodiment 1. FIG. It is a figure which shows the relationship between the rotation speed of a vehicle generator, temperature, and power generation output in Embodiment 1. FIG. It is a figure which shows the operation outline of the embodiment in Embodiment 1. FIG. It is a figure which shows the operation outline of another embodiment in Embodiment 1. FIG. It is a figure which shows the schematic structure of the vehicle power generation system including the vehicle power generation control device which concerns on Embodiment 2. FIG. It is a figure which shows the time change of the upper limit limit range threshold value, the lower limit limit range threshold value, and the rotation speed in Embodiment 3. FIG. It is a figure which shows the relationship between the rotation speed and the temperature of the vehicle generator in the vehicle power generation control device which concerns on Embodiment 4. FIG. It is a figure which shows the schematic structure of the vehicle power generation system including the vehicle power generation control device which concerns on Embodiment 6.

Embodiment 1.
FIG. 1 is a diagram showing a schematic configuration of a vehicle power generation system including a vehicle power generation control device according to the first embodiment. FIG. 2 is a diagram showing the relationship between the rotation speed of the vehicle generator at the time of power generation, the temperature, and the power generation output in the first embodiment. FIG. 3 is a diagram showing an operation outline of the embodiment in the first embodiment.

First, with reference to FIG. 1, the overall configuration and operation of the vehicle power generation system including the vehicle power generation control device according to the first embodiment will be described.

The vehicle power generation system 1 includes a vehicle power generation control device 10, a vehicle generator 20 including a rotor field winding 201, a stator armature winding 202, and a full-wave rectifier 203. ing. Further, in the vehicle power generation system 1, the field winding 201 of the rotor of the vehicle generator 20 is rotated by the output of the engine, so that the electromotive force generated in the armature winding 202 of the stator is fully waved. When the rectifier 203 converts the voltage into DC and supplies power to the battery 2 and the vehicle electric load 3, the vehicle power generation control device 10 adjusts the power generation output required by the vehicle to the power generation output required by the vehicle. The switching element 141 is controlled to open and close by the switching element driving unit 130 so that the output voltage becomes a predetermined voltage, and the field current I flowing through the field winding 201 of the rotor is controlled.

The vehicle generator 20 is driven by an engine via a belt and a pulley. The field winding 201 is energized to generate a magnetic field. The field winding 201 is wound around a field pole (not shown) to form a rotor. The armature winding 202 is a polyphase winding (for example, a three-phase winding), and is wound around an armature core to form an armature (stator). The armature winding 202 generates an electromotive force by the rotating magnetic field generated by the field winding 201. The AC output induced in the armature winding 202 is supplied to the full-wave rectifier 203. The full-wave rectifier 203 is, for example, a full-wave rectifier bridge circuit composed of six Zener diodes, and full-wave rectifies the AC output of the armature winding 202. The output of the full-wave rectifier 203 is taken out from the B terminal 4 (output terminal) of the vehicle generator 20 and supplied to the battery 2 and the vehicle electric load 3. The output of the vehicle generator 20 changes according to the rotation speed of the rotor and the energization amount of the field current I flowing in the field winding 201, and the field current is controlled by the vehicle power generation control device 10. ..

In the switching element 141, the gate is connected to the switching element drive circuit 134, the drain is connected to the B terminal 4 of the vehicle generator 20, and the source is connected to the ground terminal 5 (E terminal) via the freewheeling diode 142. There is. Further, the source of the switching element 141 is connected to the field winding 201 of the rotor via the F terminal, and when the switching element 141 is turned on, a field current flows through the field winding 201 and turns off. When it is done, this energization is stopped. The freewheeling diode 142 is connected in parallel with the field winding 201, and returns the field current flowing through the field winding 201 when the switching element 141 is turned off.

The switching element 141 for controlling the field current may be, for example, a MOSFET (Metal Oxide Semiconductor Field Effect Transister) or any other semiconductor switching element, and diodes are connected in antiparallel between the source and drain. It has a structure like that. This diode may have a configuration built in the semiconductor switching element.

The vehicle power generation control device 10 has a B terminal voltage detection circuit 111 that detects an output voltage at the B terminal 4 connected to the battery 2 and the vehicle electric load 3, and a command voltage that outputs a command voltage value from the vehicle control device ECU. For the value output circuit 112, the voltage difference detection circuit 131 that detects the difference between the voltage of the B terminal 4 and the command voltage value, the open / close energization ratio calculation circuit 133 that calculates the open / close energization ratio based on the detected voltage difference, and the open / close energization ratio. Based on this, the switching element drive unit 130 including the switching element drive circuit 134 that drives the switching element 141, the rotation speed detection circuit 113 that detects the rotation speed of the field winding 201 (rotor) of the vehicle generator 20, and the rotation. Open / close setting of the open / close energization ratio limit value of the rotation speed range detection circuit 121 that detects the range of numbers, the field current limit determination circuit 122 that determines the necessity of limiting the field current I from the rotation speed range, and the switching element 141. It is composed of a field current control unit 120 provided with a current-carrying ratio limit value setting circuit 123.

FIG. 2 shows an example of the relationship between the rotation speed, temperature, and power generation output of the vehicle generator 20 during power generation. As shown in FIG. 2A, in general, in the high rotation speed region where the power generation output of the vehicle generator is maximized, the air volume of the forced cooling fan increases, so that the temperature of the vehicle generator 20 is high. The temperature of the vehicle generator 20 does not reach the maximum because the power generation output, which is a heat generating factor, is small even in the low rotation speed region. Actually, the maximum temperature of the vehicle generator 20 is about 2,000 to 3,000 rpm in relation to the power generation output and cooling. In consideration of these points, in the first embodiment, as shown in FIG. 2B, the rotation speed is predetermined so that the temperature of the vehicle generator 20 does not exceed the heat resistance allowable temperature of the component parts. When it is within the range, the open / close ratio of the switching element 141 is adjusted to limit the field current I.

Therefore, in the vehicle power generation control device 10 of the first embodiment, after the rotation speed range is detected by the rotation speed range detection circuit 121 based on the rotation speed detected by the rotation speed detection circuit 113, the field is magnetized. When the necessity of limiting the field current is determined by the current limit determination circuit 122 and the rotation speed is determined to be within the rotation speed range at which the temperature of the vehicle generator 20 is maximized, for example, 1 second. After a certain period of time with a setting range of about 100 seconds, the open / close current ratio limit value setting circuit 123 sets the open / close current ratio limit value at which the maximum value of the open / close current ratio is 100% or less, and the switching element drive circuit. By lowering the open / close energization ratio of the switching element 141 by 134, the field current I flowing in the field winding 201 is limited, and by reducing the power generation output, the temperature rise of the vehicle generator 20 is suppressed, and the vehicle. The components of the generator 20 can be kept below the heat resistance allowable temperature, and the long-term reliability of the components can be maintained.

Here, it takes a certain amount of time from the detection by the rotation speed range detection circuit 121 that the rotation speed is within the required rotation speed range to the limitation of the open / close energization ratio. This is related to each element of the shape, output and cooling performance of the vehicle generator 20 and the ambient temperature in order for the temperature of the vehicle generator 20 to rise and the components to exceed the heat resistance allowable temperature. Therefore, since it takes a certain amount of time for the temperature of the component to reach the heat resistance allowable temperature or higher, this delay time is set by the timer as "time for the component to reach the heat resistance allowable temperature or higher"> "delay time". Set to be satisfied.

Further, when the rotation speed of the vehicle generator 20 increases or decreases when the vehicle starts, the relationship between the time staying within the rotation speed at which the field current I needs to be limited and the delay time needs to be limited. When the "time staying within the rotation speed" <"delay time" is satisfied, the field current I is not limited when the rotation speed fluctuates, so that there is no torque change and the drivability can be prevented from deteriorating. It will be possible.

Next, the details of each part constituting the vehicle power generation control device 10 will be described with reference to FIGS. 1 and 3.

The switching element drive unit 130 is the difference between the voltage value of the B terminal 4 detected by the B terminal voltage detection circuit 111 and the command voltage value from the vehicle control device that controls the vehicle stored in the command voltage value output circuit 112. Is detected by the voltage difference detection circuit 131, the open / close energization ratio is calculated by the open / close energization ratio calculation circuit 133, and the switching element drive circuit 134 generates a signal for driving the switching element 141.

Further, when the condition in the field current control unit 120 is satisfied with respect to the open / close energization ratio calculation circuit 133 for calculating the open / close energization ratio, the upper limit value of the field current I is limited by limiting the open / close energization ratio. By limiting the power generation output of the vehicle generator 20, it is possible to suppress the temperature rise of the components.

In the field current control unit 120, the rotation speed of the vehicle generator 20 detected by the rotation speed detection circuit 113 is within the rotation speed range in which the temperature of the vehicle generator 20 becomes the maximum by the rotation speed range detection circuit 121. (Although it depends on the vehicle generator 20, for example, the setting range of the lower limit of the rotation speed is 1,500 to 2,500 rpm, and the setting range of the upper limit of the rotation speed is 2,500 to 4,000 rpm.) The field current limit determination circuit 122 detects whether or not the power is present, and the rotation speed of the vehicle generator 20 is continuously set at a predetermined rotation speed for a certain period of time (set in the range of about 1 second to 10 seconds). If it is determined to be within the range, a predetermined open / close energization ratio limit value (50% to 95%) is set in the open / close energization ratio limit value setting circuit 123, and the open / close energization ratio calculation circuit 133 is set. After a certain delay time, an open / close command is issued to adjust the open / close energization ratio from 100% to the open / close energization ratio limit value, and the drive current that energizes the switching element 141 is controlled by the switching element drive circuit 134, and the current flows through the field winding 201. Limit the field current I.

The field current control unit 120 detects that the rotation speed of the vehicle generator 20 is within a predetermined rotation speed, and then the switching element drive unit 130 starts limiting by the open / close energization ratio limit value. From the detection that the constant delay time until and the rotation speed of the vehicle generator 20 are out of the predetermined rotation speed range to the release of the limitation by the open / close energization ratio limit value of the switching element drive unit 130. The fixed delay time can be set individually, and the case where the delay time is zero (no delay) is also included.

FIG. 4 is a diagram showing an operation outline of another embodiment of the first embodiment. The difference from the operation in the embodiment of FIG. 3 is that in this embodiment, when it is determined that the rotation speed is continuously within a predetermined rotation speed range for a certain period of time, a certain delay is achieved. When the open / close energization ratio is adjusted from 100% to the open / close energization ratio limit value after an hour, an open / close command is issued so that the open / close energization ratio is gradually reduced toward the open / close energization ratio limit value. After that, when it is determined that the rotation speed is out of the predetermined rotation speed range, the open / close energization ratio is changed from the open / close energization ratio limit value to 100% of the open / close energization ratio even when the limitation by the open / close energization ratio limit value is released. It is to issue an open / close command to gradually increase toward.

In the embodiment of FIG. 3, after it is determined that the rotation speed is within a predetermined range, the torque change that occurs when the open / close energization ratio is adjusted from 100% to the open / close energization ratio limit value after a certain delay time is Further, in another embodiment of FIG. 4, when adjusting the open / close energization ratio from 100% to the open / close energization ratio limit value, the torque change can be reduced by gradually reducing the open / close energization ratio over time. Further, even when the open / close energization ratio limit value is released and the open / close energization ratio is adjusted to 100%, the torque change can be reduced by gradually increasing the open / close energization ratio over time. In this way, by gradually changing the open / close energization ratio in any case, the change in the field current can be made to follow the control on the vehicle side, and the drivability can be improved.

The highest temperature of a vehicle generator is related to the power generation capacity, which is a heat generating factor, and the cooling performance of the air-cooled fan, both of which depend on the number of revolutions, so the range of the number of revolutions is detected. By limiting the field current, which is another factor that determines the power generation output, it is possible to suppress the heat generation factor and prevent the temperature of the vehicle generator from exceeding the heat resistance allowable temperature of the components.

In addition, when the field current is limited at the rotation speed at which the temperature of the vehicle generator becomes high, the torque changes suddenly even when the field is limited by gradually changing the field current over time. There is no such thing.

Further, in the conventional power generation control device for vehicles, the reliability due to the heat generation of the wiring on the vehicle side due to the constant high current flowing at high speed rotation where the power generation output of the vehicle generator becomes the maximum current becomes a problem. By releasing the restriction in a short time as in the present application, there is no influence on the wiring and others on the vehicle side. For example, more power can be charged to the battery during regenerative power generation during vehicle deceleration, and the vehicle can be charged. It can also contribute to the improvement of fuel efficiency.

As described above, according to the vehicle power generation control device according to the first embodiment, the open / close energization ratio of the switching element is in the rotation speed range in which the temperature of the component of the vehicle generator becomes high based on the detected rotation speed. By adjusting the field current and limiting the field current, the temperature can be prevented from exceeding the heat resistance allowable temperature of the component parts, which has the effect of ensuring the long-term reliability of the vehicle generator. ..

Embodiment 2.
FIG. 5 is a diagram showing a schematic configuration of a vehicle power generation system including the vehicle power generation control device according to the second embodiment. The difference from the first embodiment is that in the second embodiment, the field current detection circuit 114 and the current difference detection circuit 132 are newly provided, and the open / close energization ratio limit value setting circuit 123 limits the field current. This is a point that has been changed to the value setting circuit 124. Others are the same as those in the first embodiment, and thus the description thereof will be omitted.

First, with reference to FIG. 5, the overall configuration and operation of the vehicle power generation system including the vehicle power generation control device according to the second embodiment will be described.

The vehicle power generation control device 10 has a B terminal voltage detection circuit 111 that detects an output voltage at the B terminal 4 connected to the battery 2 and the vehicle electric load 3, and a command voltage that outputs a command voltage value from the vehicle control device ECU. Field current and field current limit value from the value output circuit 112, the field current detection circuit 114, the voltage difference detection circuit 131 that detects the difference between the B terminal voltage and the command voltage value, and the field current detection circuit 114. A current difference detection circuit 132 that detects the difference from the setting circuit 124, an open / close energization ratio calculation circuit 133 that calculates the open / close energization ratio based on the detected voltage difference and current difference, and a switching element that drives the switching element 141 based on the open / close energization ratio. A switching element drive unit 130 provided with a drive circuit 134, a rotation speed detection circuit 113 for detecting the rotation speed of the field winding 201 (rotor) of the vehicle generator 20, and a rotation speed range for detecting the rotation speed range. Field current control including a detection circuit 121, a field current limit determination circuit 122 that determines the necessity of limiting the field current from the rotation speed range, and a field current limit value setting circuit 124 that sets the field current limit value. It is composed of a unit 120 and a unit 120.

The switching element drive unit 130 detects the difference between the voltage of the B terminal 4 detected by the B terminal voltage detection circuit 111 and the voltage commanded by the vehicle control device ECU that controls the vehicle by the voltage difference detection circuit 131. Further, the difference between the field current and the current of the field current limit value setting circuit 124 is detected by the current difference detection circuit 132, and the voltage difference and the current difference are calculated by the open / close energization ratio calculation circuit 133 to calculate the open / close energization ratio. The switching element drive circuit 134 generates a signal for driving the switching element 141.

Further, when the condition in the field current control unit 120 is satisfied for the open / close energization ratio calculation circuit 133 for calculating the open / close energization ratio, the upper limit value of the field current is limited by limiting the open / close energization ratio. By limiting the power generation output of the vehicle generator 20, it is possible to suppress the temperature rise of the components.

In the field current control unit 120, the rotation speed of the vehicle generator 20 detected by the rotation speed detection circuit 113 is within the rotation speed range in which the temperature of the vehicle generator 20 becomes the maximum by the rotation speed range detection circuit 121. (Although it depends on the vehicle generator 20, for example, the setting range of the lower limit of the rotation speed is 1,500 to 2,500 rpm, and the setting range of the upper limit of the rotation speed is 2,500 to 4,000 rpm.) The field current limit determination circuit 122 detects whether or not the power is present, and the rotation speed of the vehicle generator 20 is continuously set at a predetermined rotation speed for a certain period of time (set in the range of about 1 second to 10 seconds). When it is determined that the field current is within the range, the field current detected by the field current detection circuit 114 is the field current limit value set by the field current limit value setting circuit 124 (for example, 1A to 10A). To prevent the above, an open / close command is issued to the open / close energization ratio calculation circuit 133 to adjust the open / close energization ratio from 100% to the open / close energization ratio limit value corresponding to the field current limit value after a certain delay time, and switching is performed. The element drive circuit 134 controls the drive current that energizes the switching element 141, and limits the field current I that flows through the field winding 201.

Similar to the first embodiment, when it is determined that the rotation speed is continuously within the predetermined range for a certain period of time, the open / close energization ratio is changed from 100% to the open / close energization ratio limit value after a certain delay time. At the time of adjustment, an open / close command is issued so that the open / close energization ratio is gradually reduced toward the open / close energization ratio limit value, and then the open / close is performed when it is determined that the rotation speed is out of the predetermined rotation speed range. Even when the restriction by the energization ratio limit value is released, an open / close command can be issued so that the open / close energization ratio is gradually increased from the open / close energization ratio limit value toward the open / close energization ratio of 100%.

As shown in FIG. 4, the open / close energization ratio is adjusted from 100% to the open / close energization ratio limit value in response to the torque change that occurs when the open / close energization ratio is adjusted from 100% to the open / close energization ratio limit value after a certain delay time. By gradually reducing the torque over time, the torque change can be reduced. Further, even when the open / close energization ratio limit value is released and the open / close energization ratio is adjusted to 100%, the torque change can be reduced by gradually increasing the open / close energization ratio over time. In this way, by gradually changing the open / close energization ratio in any case, the change in the field current can be made to follow the control on the vehicle side, and the drivability can be improved.

In the first embodiment, the field current is limited by the open / close energization ratio limit value at which the open / close energization ratio is 100% or less. However, in this method, the resistance value changes depending on the temperature of the field coil. When limiting by the open / close current ratio as in the open / close current ratio limit value, the torque changes greatly due to the change in the field current at the time of limitation and the change in the electromotive force. However, in the second embodiment, the field current detection circuit The switching element drive unit 130 controls the open / close energization ratio so that the field current detected by 114 does not exceed the field current limit value, and by limiting the field current, the resistance of the field coil due to temperature increases. Since the field current at the time of limitation does not change even if it changes, the field current does not change and the torque does not change significantly due to temperature. It is possible to limit the field current.

As described above, according to the vehicle power generation control device according to the second embodiment, the field current is limited in the rotation speed range in which the temperature of the component of the vehicle generator becomes high based on the detected field current. By doing so, the temperature can be prevented from exceeding the heat resistance allowable temperature of the component parts, and there is an effect that the long-term reliability of the vehicle generator can be ensured.

Embodiment 3.
FIG. 6 is a diagram showing a time change of the upper limit limit range threshold value, the lower limit limit range threshold value, and the rotation speed in the third embodiment. The third embodiment shows the operation in the rotation speed range detection circuit applied to the vehicle power generation system including the vehicle power generation control device of the first and second embodiments. Since the configuration of the vehicle power generation system is the same as that of the first embodiment and the second embodiment, the description thereof will be omitted.

FIG. 6 shows the detection operation of the rotation speed range detection circuit 121 in the vehicle power generation control device of FIGS. 1 and 5.
Here, in the rotation speed range detection circuit 121 for the rotation speed range detection and the rotation speed out-of-range detection, it is detected that the rotation speed is within a predetermined rotation speed range when the rotation speed increases from a low state. The lower limit limit range threshold of the rotation speed that detects that the rotation speed is out of the predetermined rotation speed is set lower than the lower limit limit range threshold of the rotation speed to be performed, and the rotation speed is set to be lower from the high state. At that time, the upper limit of the number of revolutions for detecting that the number of revolutions is within the range of the predetermined number of revolutions is higher than the threshold within the upper limit limit range of the number of revolutions for detecting that the number of revolutions is within the range of the predetermined number of revolutions. The out-of-limit threshold is set higher.

Therefore, even if there is a pulsation of the rotation speed during the field current limitation, it is possible to prevent the field current limitation from being unnecessarily released. As a result, when the field current is limited, it is possible to prevent the engine from being affected by the rotational pulsation of the engine due to the compression process or the combustion stroke of the engine.

As described above, according to the vehicle power generation control device according to the third embodiment, stable operation is performed even when there is a pulsation of the engine speed together with the effects of the first and second embodiments. There is an effect that makes it possible to make it.

Embodiment 4.
FIG. 7 is a diagram showing the relationship between the rotation speed and the temperature of the vehicle power generator in the vehicle power generation control device according to the fourth embodiment. FIG. 7 shows a field current limit rotation speed region applied to a vehicle power generation system including the vehicle power generation control device of the first embodiment and the second embodiment in the fourth embodiment. Since the configuration of the vehicle power generation system is the same as that of the first embodiment and the second embodiment, the description thereof will be omitted.

In the field current limit determination circuit 122, there are a plurality of rotation speed regions for limiting the field current. For example, in the first field current limitation rotation speed region, the power generation output which is a heat generation element and the air volume which is a cooling element The first field current limitation is implemented in the rotation speed region where the heat resistance allowable temperature of the component of the vehicle generator 20 is exceeded in balance, and the second field current limitation rotation speed region is related to the air volume of the fan. By implementing the second field current limit in the rotation speed region where the heat resistance allowable temperature of the component of the vehicle generator 20 is exceeded by the power output, the component of the vehicle generator can be used in the entire operating range. The heat resistance allowable temperature will not be exceeded.
The first field current limit and the second field current limit do not necessarily have to be the same field current limit.

Since there are a plurality of rotation speed regions that limit the field current and each of them can be set individually, it is possible to set the limit of the field current corresponding to the rotation speed region.
Therefore, for example, when power generation output in the low rotation speed region is required, the maximum power generation output in the high rotation speed region is also large due to the characteristics of the vehicle generator, but depending on the vehicle, the maximum power generation output in the high rotation speed region is also large. Is not so necessary, but it may require power output in the low rpm range.
In such a case, in order to limit the field current in the rotation speed region where the temperature of the vehicle generator is maximum and to limit the power generation output in the high rotation speed region in order to suppress the maximum power generation output, By having a plurality of rotation speed regions that limit the field current in the first field current limiting rotation speed region and the second field current limiting rotation speed region, it is effective to set each individually.

As described above, according to the vehicle power generation control device according to the fourth embodiment, in addition to the effects of the first and second embodiments, a plurality of rotation speed regions for limiting the field current are provided for the vehicle. There is an effect that the power generation output can be individually restricted in the rotation speed region where the temperature of the generator becomes maximum and the maximum power generation output in the high rotation speed region.

Embodiment 5.
The vehicle power generation control device according to the fifth embodiment relates to regenerative control by a rotation speed range detection circuit 121 applied to a vehicle power generation system including the vehicle power generation control device 10 of FIGS. 1 and 5.

As a means for improving the fuel efficiency of recent vehicles, battery management is widely performed by regenerative control that positively converts energy during deceleration into electric energy. Therefore, when the field current is limited based on the detection result of the rotation speed range detection circuit 121, the battery 2 is charged with more power by releasing the field current limitation during the regeneration control. It will be possible to do.

It is conceivable that the regenerative control is in progress due to a change in the rotation speed of the vehicle generator 20 or a command from an external vehicle control device ECU to change the voltage command value. As a condition for releasing the field current limitation, a voltage command value from an external vehicle control device or a command for canceling the field current limitation state is given to the vehicle generator 20 in addition to being out of the rotation speed range. By inputting, the field current limiting state is released for a predetermined time, for example, when the vehicle decelerates, the field current limiting state is released to increase the power generation output of the vehicle. Regenerative power generation can be performed in which the kinetic energy is stored in the battery 2 as electric energy, which can contribute to the improvement of the fuel efficiency of the vehicle.

As described above, according to the vehicle power generation control device according to the fifth embodiment, the field current limitation is released during the regenerative control together with the effects of the first and second embodiments, so that more can be obtained. It has the effect of making it possible to charge the battery with electric power.

Embodiment 6.
FIG. 8 is a diagram showing a schematic configuration of a vehicle power generation system including the vehicle power generation control device according to the sixth embodiment. The difference from the first embodiment is that the sixth embodiment is newly provided with a temperature detection circuit 115 for detecting the temperature of the vehicle generator. Others are the same as those in the first embodiment, and thus the description thereof will be omitted.

The component parts of the vehicle generator 20 exceed the heat resistance allowable temperature when the ambient temperature to which the vehicle generator 20 is attached is high. In the vehicle power generation control device 10 of FIG. 8, the temperature detection circuit 115 correlates with the ambient temperature of the vehicle generator 20 or the component temperature of the vehicle generator 20 having a reliability problem in terms of temperature. When a certain temperature is measured and the component temperature of the vehicle generator 20 is low, a large power generation output can be obtained by not limiting the field current.

As a result, a state in which the heat resistance allowable temperature of the components of the vehicle generator 20 is exceeded does not occur when the atmosphere temperature of the vehicle generator 20 is low, so that the atmosphere temperature of the vehicle generator 20 does not occur. Alternatively, by detecting a temperature that correlates with the atmospheric temperature of the vehicle generator 20 and not implementing field current limitation if the temperature is below a predetermined temperature, the life of the component parts of the vehicle generator 20 can be extended. At unaffected temperatures, large power output can be obtained. For example, in winter when the ambient temperature to which the vehicle generator 20 is attached is low and the temperature is low, it is possible to supply sufficient power to the vehicle when the power consumption of the vehicle is high due to the seasonal heater. It becomes.

As described above, according to the vehicle power generation control device according to the sixth embodiment, the temperature of the vehicle generator is detected, and if the temperature is equal to or lower than the predetermined temperature, the field current limitation is not performed. At a temperature that does not affect the life of the components of the vehicle generator, there is an effect that a large power generation output can be obtained.

Also, while various exemplary embodiments and embodiments are described in the present application, the various features, embodiments, and functions described in one or more embodiments are specific embodiments. It is not limited to the application of the embodiment, but can be applied to the embodiment alone or in various combinations.
Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

Further, in the figure, the same reference numerals indicate the same or corresponding parts.

1 Vehicle power generation system, 2 Battery, 3 Vehicle electric load, 4 B terminal, 5 Ground terminal, 10 Vehicle power generation control device, 20 Vehicle generator, 111 B terminal voltage detection circuit, 112 Command voltage value output circuit, 113 Rotation speed detection circuit, 114 field current detection circuit, 115 temperature detection circuit, 120 field current control unit, 121 rotation speed range detection circuit, 122 field current limit determination circuit, 123 open / close current ratio limit value setting circuit, 124 fields Magnetic current limit value setting circuit, 130 switching element drive unit, 131 voltage difference detection circuit, 132 current difference detection circuit, 133 open / close current ratio calculation circuit, 134 switching element drive circuit, 141 switching element, 142 freewheeling diode, 201 field winding Wire, 202 armature winding, 203 full-wave rectifier

The first vehicle power generation control device disclosed in the present application includes a switching element that limits the field current of a field winding type vehicle generator, and a rotation speed detection that detects the rotation speed of the vehicle generator. The circuit, the rotation speed range detection circuit that detects whether the rotation speed is within the rotation speed range that does not exceed the heat resistant allowable temperature of the component of the vehicle generator, and the detection result of the rotation speed range detection circuit. Based on this , a field current limit determination circuit that determines the necessity of limiting the field current, an open / close energization ratio limit value setting circuit that sets an open / close energization ratio limit value to adjust the open / close energization ratio of the switching element, and an open / close energization ratio limit value setting circuit. the provided, after the speed has been detected to be within the scope of the prior Kikai number rolling, the open-close energizing ratio limit the opening and closing current ratio after a certain time is in a range of 50% to 95% set are, within the scope of the on-off energization ratio limit value, by adjusting the opening and closing current ratio, and controls the field current and the rotating speed is detected to be outside the scope of prior Kikai number rolling Then, after a certain period of time, the open / close energization ratio limit value is released, the open / close energization ratio is adjusted to 100%, and the field current is controlled.

Further, the second vehicle power generation control device includes a switching element that limits the field current of the field winding type vehicle generator, a rotation speed detection circuit that detects the rotation speed of the vehicle generator, and a rotation speed detection circuit. engine speed range detection circuit for detecting the field current detection circuit for detecting the field current, whether the rotational speed is the rotational speed of the range not exceeding the maximum allowable temperature of the components of the generator the vehicle A field current limit determination circuit that determines the necessity of limiting the field current based on the detection result of the rotation speed range detection circuit, and a field current limit value for adjusting the field current are set. and a field current limiting value setting circuit, then the rotational speed is detected to be within the scope of the prior Kikai number rolling, the field current limit value is set after a certain time, the magnetic field within the current limit value, by adjusting the opening and closing current ratio of the switching element, and controls the field current and, after the rotation speed is detected to be outside the scope of prior Kikai number rolling After a certain period of time, the field current limit value is released, the open / close energization ratio is adjusted to 100%, and the field current is controlled.

Claims (11)

A switching element that limits the field current of a field winding type vehicle generator,
A rotation speed detection circuit that detects the rotation speed of the vehicle generator, and
A rotation speed range detection circuit that detects whether or not the rotation speed is within a predetermined rotation speed range, and
The field current limit determination circuit that determines the necessity of limiting the field current, and the field current limit determination circuit.
A circuit for setting an open / close energization ratio limit value for setting an open / close energization ratio limit value in order to adjust the open / close energization ratio of the switching element is provided.
After it is detected that the rotation speed is within the predetermined rotation speed range, the open / close energization ratio limit value is set so that the open / close energization ratio becomes 100% or less after a certain period of time.
The field current is controlled by adjusting the open / close energization ratio within the range of the open / close energization ratio limit value.
Further, after it is detected that the rotation speed is out of the predetermined rotation speed range, the open / close energization ratio limit value is released after a certain period of time, and the open / close energization ratio is adjusted to 100%. A vehicle power generation control device characterized by controlling the field current. After it is detected that the rotation speed is within the range of the predetermined rotation speed, the open / close energization ratio limit value is set so that the open / close energization ratio becomes 100% or less after a certain period of time.
Within the range of the open / close energization ratio limit value, the open / close energization ratio is adjusted to control the field current by a limiting operation that gradually decreases with time.
Moreover, after it is detected that the rotation speed is out of the predetermined rotation speed range, the open / close energization ratio limit value is released after a certain period of time, and the open / close energization is performed by a limiting operation that gradually increases with time. The vehicle power generation control device according to claim 1, wherein the field current is controlled by adjusting the ratio to 100%. As a condition for releasing the open / close energization ratio limit value, the field current limit is released after a certain period of time due to the detection of an increase in the rotation speed equal to or higher than the predetermined rotation speed. The vehicle power generation control device according to claim 1 or 2. As a condition for releasing the open / close energization ratio limit value, the voltage command value is increased from an external vehicle control device, or a command for releasing the field current limit is input, so that the fixed time period is reached. The vehicle power generation control device according to claim 1 or 2, wherein the field current limitation is later released. A switching element that limits the field current of a field winding type vehicle generator,
A rotation speed detection circuit that detects the rotation speed of the vehicle generator, and
A field current detection circuit that detects the field current, a rotation speed range detection circuit that detects whether or not the rotation speed is within a predetermined rotation speed range, and a rotation speed range detection circuit.
The field current limit determination circuit that determines the necessity of limiting the field current, and the field current limit determination circuit.
A field current limit value setting circuit for setting a field current limit value for adjusting the field current is provided.
After it is detected that the rotation speed is within the predetermined rotation speed range, the field current limit value is set after a certain period of time.
Within the range of the field current limit value, the switching energization ratio of the switching element is adjusted to control the field current.
Further, after it is detected that the rotation speed is out of the predetermined rotation speed range, the field current limit value is released after a certain period of time, and the open / close energization ratio is adjusted to 100%. , A vehicle power generation control device characterized by controlling the field current. After it is detected that the rotation speed is within the predetermined rotation speed range, the field current limit value is set after a certain period of time.
The field current is controlled by adjusting the open / close energization ratio within the range of the field current limit value and controlling the field current by a limiting operation that gradually decreases with time.
Moreover, after it is detected that the rotation speed is out of the predetermined rotation speed range, the field current limit value is released after a certain period of time, and the limit operation gradually increases with time. The vehicle power generation control device according to claim 5, wherein the open / close energization ratio is adjusted to 100% to control the field current. As a condition for releasing the field current limit value, the field current limit is released after a certain period of time due to the detection of an increase in the rotation speed equal to or higher than the predetermined rotation speed. The vehicle power generation control device according to claim 5 or 6. As a condition for releasing the field current limit value, the voltage command value is increased from an external vehicle control device, or a command for releasing the field current limit value is input, so that the fixed time period is reached. The vehicle power generation control device according to claim 5 or 6, wherein the field current limitation is later released. Out of the range of the predetermined rotation speed than the lower limit limit range of the rotation speed for detecting that the rotation speed is within the range of the predetermined rotation speed when the rotation speed increases from the low state. The lower limit limit range of the rotation speed for detecting that the rotation speed has become lower is set lower, and when the rotation speed decreases from a high state to a low value, the rotation speed falls within the predetermined rotation speed range. The feature is that the upper limit limit range threshold of the rotation speed for detecting that the rotation speed is out of the predetermined rotation speed is set higher than the upper limit limit range threshold of the rotation speed for detecting that. The vehicle power generation control device according to any one of claims 1 to 8. The vehicle power generation control device according to any one of claims 1 to 9, wherein a plurality of set values in the predetermined rotation speed range are provided and the field current is individually controlled. .. The invention according to any one of claims 1 to 10, further comprising a temperature detection circuit for detecting the temperature of the vehicle generator and limiting the field current if the temperature is equal to or higher than a predetermined temperature. The vehicle power generation control device described.

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