JP4158615B2 - Vehicle power supply - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular power supply device that controls a power generation amount of a generator that is driven by an internal combustion engine to generate power.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a generator is mounted on a vehicle to supply power to various electric loads and charge a battery. Since this generator is driven by the engine to generate power, fuel is also consumed for the power generation.
On the other hand, in recent years, improvement in fuel efficiency of vehicles has been desired due to environmental problems, and a method for reducing fuel consumed for power generation has been proposed (see Patent Document 1).
In this prior art, it is specified that the generator is operated under operating conditions with relatively low engine efficiency in order to take advantage of the fuel efficiency improvement effect due to the engine operating point moving to the high efficiency side by power generation.
[0003]
[Patent Document 1]
Japanese National Patent Publication No. 6-505619
[Problems to be solved by the invention]
However, in the above method, an effect by improving the engine efficiency can be expected, but since the generator is operated in a region where the engine efficiency is low in the first place, if the power generation amount is increased in this region, the fuel efficiency improving effect is reduced. In other words, the amount of fuel consumed for power generation is greater in the lower region than in the region where the engine efficiency is high. Therefore, even if only the improvement effect by changing the operating point of the engine (moving toward the high efficiency side) is emphasized. The fuel efficiency improvement effect cannot be expected.
The present invention has been made based on the above circumstances, and its purpose is to generate power at an engine operating point with a small amount of fuel increase necessary for power generation, thereby generating power (increased fuel consumption by power generation). An object of the present invention is to provide a vehicle power supply device that can reduce the above.
[0005]
[Means for Solving the Problems]
(Invention of Claim 1)
The vehicle power supply device of the present invention includes power supply control means for controlling the power generation amount of the generator in accordance with the output of the internal combustion engine, and the power supply control means is a power source for the internal combustion engine when generating power with the generator. When the power generation range is set from the fuel consumption corresponding to the up and the fuel consumption corresponding to the improvement in fuel efficiency due to the power increase of the internal combustion engine, the power generation range is set when the operating point of the internal combustion engine is included in the power generation range. The machine is characterized by generating electricity.
[0006]
According to the above configuration, the power generation range is set for the fuel consumption corresponding to the power increase of the internal combustion engine used for power generation in consideration of the improvement effect of the fuel consumption rate accompanying the power increase. By performing power generation when the operating point of the internal combustion engine is included in the range, it is possible to reduce the fuel increase necessary for power generation, that is, the amount of fuel consumed to generate power.
[0007]
The power generation range is set based on a minimum value of a value obtained by subtracting the fuel consumption corresponding to the fuel consumption improvement corresponding to the power increase of the internal combustion engine from the fuel consumption corresponding to the power increase of the internal combustion engine. It is characterized by that.
[0008]
The fuel increase required for power generation is the value obtained by subtracting the fuel consumption corresponding to the improvement in fuel efficiency accompanying the power increase of the internal combustion engine from the fuel consumption corresponding to the power increase of the internal combustion engine. When the value is reached, the fuel increase is minimized. Therefore, by setting the power generation range based on the minimum value, it is possible to generate power at the operating point of the internal combustion engine with a small amount of fuel increase necessary for power generation.
[0009]
Further, the power generation range is set in a medium rotation speed region and a medium load region of the internal combustion engine.
When the fuel consumption rate of the internal combustion engine is calculated, the fuel consumption rate decreases in a region where the rotational speed of the internal combustion engine is relatively low and the torque is high (for example, 1500 to 3000 rpm, 70 to 100 Nm). Is getting bigger. Based on this fuel efficiency, if the power generation range is set from the fuel consumption corresponding to the power increase of the internal combustion engine and the fuel consumption corresponding to the improvement of the fuel efficiency due to the power increase of the internal combustion engine, In the medium rotation speed region and the medium load region, the fuel increase necessary for power generation is minimized. Therefore, by generating power when the operating point of the internal combustion engine is included in the medium speed region and the medium load region, the amount of fuel consumed for the power generation can be reduced.
[0010]
(Invention of Claim 2 )
In the vehicle dual power system as claimed in claim 1,
The power generation range is defined by the rotational speed and torque of the internal combustion engine, or a value corresponding to the rotational speed and a value corresponding to the torque.
Thereby, since the power generation range can be defined in detail, it becomes possible to generate power intensively within the defined power generation range.
[0011]
(Invention of Claim 3 )
In the vehicle dual power system as claimed in claim 1 or 2,
The generator is an alternator that has a rotor around which a field winding is wound and a stator around which an armature winding is wound, and generates an AC voltage in the armature winding by the rotation of the rotor. The means includes a regulator that adjusts the voltage generated by the alternator, and the amount of power generation is controlled by changing the adjustment voltage of the regulator.
Since vehicles such as automobiles are equipped with an alternator and a regulator as a battery charger, the amount of power generation can be controlled by changing the regulator adjustment voltage.
[0012]
(Invention of Claim 4 )
In the vehicle dual power system as claimed in claim 1 or 2,
The generator is an alternator that has a rotor around which a field winding is wound and a stator around which an armature winding is wound, and generates an AC voltage in the armature winding by the rotation of the rotor. The means is characterized in that the amount of power generation is controlled by changing a field current applied to the field winding.
The output voltage (power generation amount) of the alternator can be controlled by directly changing the field current.
[0013]
(Invention of Claim 5 )
In the vehicle dual power system as claimed in claim 1 or 2 or 4,
The generator is a multiphase AC rotating machine having a rotor that forms a field and a stator around which an armature winding is wound, and the power control means is an inverter that controls a voltage applied to the armature winding. The power generation amount is controlled by changing the torque command value or the power command value for the inverter.
A torque command value or a power command value can be calculated from the required power generation amount and the rotational speed, and by controlling the inverter according to the calculated value, concentrated power generation can be easily performed when the power generation efficiency is good.
[0014]
(Invention of Claim 6 )
The vehicle power supply device according to any one of claims 1 to 5 ,
The power control means narrows the power generation range as the remaining capacity of the battery increases. As a result, it is possible to intensively generate power in a region (power generation range) where the amount of fuel consumption accompanying power generation is small, and the fuel efficiency improvement effect can be increased.
[0015]
(Invention of Claim 7 )
In the vehicle power supply device according to claim 6 ,
A minimum range is set in the power generation range.
If the set power generation range becomes smaller, the power generation opportunities inevitably decrease, and the battery is overdischarged. On the other hand, since a predetermined power generation opportunity can be ensured by setting the minimum range in the power generation range, it is possible to prevent overdischarge of the battery.
[0016]
(Invention of Claim 8 )
The vehicle power supply device according to any one of claims 1 to 5 ,
The power control means extends the power generation range as the remaining capacity of the battery is smaller. When the remaining capacity of the battery is small, the amount of power generation is insufficient. Therefore, widening the power generation range and increasing the power generation opportunity solves the shortage of power generation and prevents overdischarge of the battery.
[0017]
(Invention of Claim 9 )
The vehicle power supply device according to any one of claims 1 to 8 ,
The power supply control means increases the power generation amount as the remaining capacity of the battery is smaller. When the remaining capacity of the battery is small, the power generation amount is insufficient. Therefore, by increasing the power generation amount, the shortage of the power generation amount is solved, and overdischarge of the battery can be prevented. In particular, if the power generation amount is insufficient even if the power generation range is expanded, the power balance can be improved by increasing the power generation amount.
[0018]
(Invention of Claim 10 )
The vehicle power supply device according to any one of claims 1 to 9 ,
The power control means reduces the power generation amount as the remaining capacity of the battery increases. When the remaining capacity of the battery is large, the power balance can be improved by reducing the amount of power generation, and overcharging of the battery can be prevented.
[0019]
(Invention of Claim 11 )
The vehicle power supply device according to any one of claims 1 to 10 ,
The power control means changes the torque of the internal combustion engine according to the amount of power generation. In this case, since the torque of the internal combustion engine is changed in accordance with the change in the power generation amount, the driving torque of the vehicle does not change even if the power generation amount changes, and the driver's uncomfortable feeling can be prevented.
[0020]
(Invention of Claim 12 )
The vehicle power supply device according to any one of claims 1 to 11 ,
The power control means sets the basic amount of power generation according to the operating region of the internal combustion engine.
In this case, since the power generation basic amount (basic amount of power generation) can be individually adjusted for each operation region of the internal combustion engine, controllability can be improved.
[0021]
(Invention of Claim 13 )
In the vehicle power supply device according to claim 12 ,
The power supply control means is characterized in that the basic amount of power generation is set to a higher value at the center of the set region set in accordance with the operating region of the internal combustion engine.
Even when the power generation range is expanded, a large amount of power can be generated at a high efficiency, so the power generation efficiency is increased.
[0022]
(Invention of Claim 14 )
The vehicle power supply device according to any one of claims 1 to 13 ,
The power supply control means sets an upper limit of the power generation amount.
As a result, the torque of the internal combustion engine used for power generation is restricted, so that high-efficiency power generation becomes possible while ensuring the output characteristics of the internal combustion engine.
[0023]
(Invention of Claim 15 )
In the vehicle power supply device according to claim 14 ,
The power control means sets the upper limit of the power generation amount according to the operating region of the internal combustion engine.
In this case, by compensating so that power is generated within the maximum torque range of the internal combustion engine, high-efficiency power generation becomes possible while ensuring the stability of the output of the internal combustion engine.
[0024]
(Invention of Claim 16 )
In the vehicle power supply device according to claim 14 ,
The power control means sets an upper limit of the power generation amount according to a request of the internal combustion engine or the vehicle.
By setting the upper limit of the torque that can be used for power generation by the internal combustion engine or the vehicle, power generation can be performed within the range, and high-efficiency power generation is possible while ensuring vehicle acceleration performance and the like.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the following examples.
(Example)
FIG. 1 is an overall configuration diagram of a vehicle power supply device 1.
The vehicle power supply device 1 is controlled by a generator 3 driven by an engine 2 (the internal combustion engine of the present invention) to generate power, a battery 4 charged by power generated by the generator 3, and an output of the engine 2. Engine control means 5 that performs power generation, and power supply control means 7 that controls the amount of power generated by the generator 3 via the generator control means 6.
[0026]
The generator 3 is, for example, a known alternator, and a pulley 3 a attached to a rotating shaft and a crank pulley 2 a attached to a crank shaft of the engine 2 are connected by a belt 8. When the vehicle decelerates, regenerative power generation is possible in which the kinetic energy (traveling inertial energy) of the vehicle is converted into electric energy and the generator 3 generates power.
A battery 4 and a plurality of load control means 10, 11, 12 are connected to the generator 3 through a power line 9.
The battery 4 is configured, for example, by connecting a plurality of battery cells in series, and generates an output voltage of about 12V.
[0027]
A plurality of electrical loads 10a, 10b, and 10c are connected to the load control means 10, and output control and energization control for the electrical loads 10a, 10b, and 10c are performed based on signals from operation switches and sensors (not shown). Similarly, the load control means 11 performs output control and energization control on the electric loads 11a, 11b, 11c belonging to itself, and the load control means 12 outputs to the electric loads 12a, 12b, 12c belonging to itself. Control and energization control are performed. Each load control means 10, 11, 12 is connected to the power supply control means 7 through a multiplex signal transmission line (for example, CAN bus) 13, and bidirectionally by multiplex communication with the power supply control means 7. Send and receive information.
[0028]
The engine control means 5 is connected to the power supply control means 7 and transmits sensor information detected by various sensors (not shown) for detecting the operating state of the engine 2 to the power supply control means 7, and the power supply control means The output of the engine 2 is increased or decreased according to the command from 7.
The generator control means 6 transmits the power generation information such as the current power generation amount and the rotation speed of the generator 3 to the power supply control means 7 and controls the power generation amount of the generator 3 in accordance with a command from the power supply control means 7. .
[0029]
The power supply control means 7 includes a battery current sensor 14 that detects an input / output current of the battery 4, a load current sensor 15 that detects a load current that is passed through the load control means 10, and a battery temperature that detects the temperature of the battery 4. A sensor 16 and a battery voltage sensor (not shown) for detecting the terminal voltage of the battery 4 are connected, and based on the sensor information, a command related to the control of the generator 3 is transmitted to the generator control means 6. .
The power supply control means 7 sets the range of the engine operating point where the generator 3 performs the power generation operation as a power generation range, and when the engine operating point is included in the power generation range, the power generation control means 6 generates power to the generator 3 through the generator control means 6. To do.
[0030]
The power generation range is set based on the fuel consumption map shown in FIG. 3 (the engine speed and engine torque are used as coordinate axes). This fuel consumption map is based on the fuel consumption rate (g / kWh) of the engine 2 shown in FIG. 2 and the fuel consumption per 1 W of power increase when 100 W of power is additionally output at each operating point of the engine 2. (G / kW h) is calculated and plotted in a contour line, and is the smallest in the middle-rotation load region of engine 2 (the range indicated by solid line S in the figure), and the farther it is from that region, It is getting bigger.
[0031]
The increase ΔQ in fuel consumption due to power generation is calculated by the following equation.
However, the fuel consumption corresponding to the power increase of the engine 2 (fuel consumption rate × power increase) is Q1, and the fuel consumption corresponding to the fuel efficiency improvement corresponding to the power increase of the engine 2 (fuel efficiency improvement × power) ) Is Q2.
ΔQ = Q1-Q2
Although details are not described here, ΔQ can be corrected according to the efficiency of the generator 3. That is, when the engine power is increased and the amount of power generation is increased, ΔQ is smaller when the efficiency of the generator 3 is increased, and ΔQ is larger when the efficiency of the generator 3 is decreased.
[0032]
As shown in FIG. 4, the fuel consumption rate of the engine 2 increases as the engine torque decreases (the fuel efficiency decreases), and decreases as the engine torque increases (the fuel efficiency decreases). Be good). Therefore, in the region where the engine torque is small, the fuel efficiency rate improvement ΔF1 due to power increase per unit is large, and in the region where the engine torque is large, the fuel efficiency rate improvement width ΔF2 due to power increase per unit is small. Therefore, when the increase in fuel consumption due to the power increase of the engine 2 is calculated based on the fuel efficiency described above, the balance between the fuel consumption corresponding to the power increase and the fuel efficiency improvement due to the power increase is calculated. As shown in FIG. 3, it becomes the minimum in the middle rotation / middle load region.
[0033]
Next, the control method of the generator 3 by the power supply control means 7 is demonstrated according to the flowchart shown in FIG.
Step 100: An engine operating point is detected.
Step 110: The remaining capacity SOC of the battery 4 is detected, and it is determined whether or not the SOC is smaller than a predetermined threshold value. When the determination result is YES, the process proceeds to step 120, and when the determination result is NO, the process proceeds to step 150.
[0034]
Step 120: It is determined whether or not the current power generation range is the maximum. In the first determination, for example, an initial power generation range indicated by a solid line region A in FIG. 6 is set as a default value. This initial power generation range is a minimum range including a medium-rotating load region (range indicated by a solid line S in FIG. 3) of the engine 2 in which the increase in fuel consumption per 1 W of power increase is the smallest. When the determination result is YES, the process proceeds to step 130, and when the determination result is NO, the process proceeds to step 140.
[0035]
Step 130: When the SOC of the battery 4 is smaller than the threshold value even though the power generation range is the maximum, the power generation command value (power generation amount) is increased.
Step 140: If the power generation range is not the maximum, the power generation range is expanded.
Step 150: It is determined whether or not the power generation command value (power generation amount) is minimum. When the determination result is YES, the process proceeds to step 160, and when the determination result is NO, the process proceeds to step 170.
[0036]
Step 160: If the power generation command value (power generation amount) is minimum, the power generation range is reduced.
Step 170: If the power generation command value (power generation amount) is not minimum, the power generation command value is decreased.
Note that when changing the power generation range and the power generation command value, it is possible to determine the range of change in advance and increment or decrement each time this control loop is passed. For example, regarding the power generation range, the rotational speed change width ΔNe = 100 rpm, the torque change width ΔTe = 5 Nm, etc., and the power generation command value (power generation amount) is changed at any time, such as ΔW = 200 W.
[0037]
Specifically, in the case where the initial (default value) power generation range is 2000 rpm <Ne <3500 rpm, 40 Nm <Te <70 Nm, and the power generation command value W = 1000 W, when the SOC of the battery 4 is insufficient, a broken line in FIG. As shown in the region B, 1900 rpm <Ne <3600 rpm and 35 Nm <Te <75 Nm are changed. Further, if the SOC is insufficient even if the maximum range is expanded, W is changed to 1200W.
[0038]
Alternatively, as shown in FIG. 7, an initial value (default value) of the power generation command value may be determined in advance for each operation region (rotation speed, torque) of the engine 2 and the added amount may be determined as ΔW. Alternatively, it can be changed to a value proportional to the initial value. By these methods, it becomes possible to generate power intensively in the middle-rotation load region of the engine 2, and the power generation range and power generation command value (power generation amount) according to the state of charge (remaining capacity) of the battery 4. By changing, overcharge and overdischarge of the battery 4 can be prevented.
[0039]
Step 180 ... For the power generation range changed in Step 140 or Step 170, the current engine operating point (the rotation speed is the value detected in Step 100, and the torque is used for power generation from the torque value detected in Step 100. If the remaining value minus the minute) is included, the corresponding power generation command value (the power generation command value changed in step 130 or step 150) is set, and the current engine operating point is not included in the power generation range Sets zero as the power generation command value. Therefore, power generation is not performed when the current engine operating point is out of the power generation range.
[0040]
Step 190... The torque or the maximum output value that can be used for power generation is read from the engine 2 or the vehicle. This value is set according to the permissible torque when power generation is stopped or reduced, for example during vehicle acceleration, or the current engine torque excluding the power generation torque and the engine maximum torque at the current engine speed. Is set as the upper limit of the engine torque that can be used for power generation.
[0041]
Step 200... The power generation amount or the power generation torque command is output to the power generator control means 6 so that it is within the range set in Step 190, and the power generator 3 is caused to generate power. For example, when the maximum allowable power generation torque of the engine 2 is 30 Nm, the current engine speed is 3000 rpm, and the generator efficiency is 70%, when a torque command is sent to the generator 3, it is set within a range of 30 Nm or less. When the power generation amount is commanded, it is set within a range of 30 Nm × 3000 rpm × 2π / 60 × 70% = 6.6 kW or less.
[0042]
Step 210: An additional command for the engine torque {= power generation command amount / (engine speed × power generation efficiency of the generator 3)} corresponding to the power generation amount is sent to the engine 2. Thereby, even if the power generation amount changes, the driving torque of the vehicle does not change, and it is possible to prevent the driver from feeling uncomfortable. The engine torque can be easily changed by changing the throttle opening and ignition timing, and can be realized by a known engine torque control system for more precise implementation.
[0043]
(Effect of this embodiment)
In the vehicle power supply device 1 of this embodiment, based on the fuel consumption rate of the engine 2, the engine region (medium-rotation load region) in which the fuel increase per unit power generation is minimized is calculated, and power generation is performed based on the region. Since the range is set, power generation is focused on the middle-rotation load region of the engine 2 where the increase in fuel consumption due to power generation can be minimized by performing power generation when the engine operating point is included in this power generation range. It becomes possible to do. As a result, the increase in fuel required for power generation can be reduced, and the power generation cost can be reduced.
Moreover, the overcharge and overdischarge of the battery 4 can be prevented by changing the power generation range and the power generation command value (power generation amount) according to the state of charge (remaining capacity) of the battery 4.
[0044]
The fuel consumption map shown in FIG. 3 is a graph showing the increase in fuel consumption due to 1 W of power increase when the engine power is increased by 100 W. The actual power generation amount (for example, 300 W is increased). By changing to a map of increase in fuel consumption per 1 W of power increase in the case of power generation, it becomes possible to perform concentrated power generation in an optimal region according to the actual power generation amount.
[0045]
When an alternator is used as the generator 3, a method of controlling the regulator adjustment voltage, a method of directly changing the current of the field winding, or the like can be applied to control the amount of power generation. When a normal three-phase AC rotating machine is used, a power generation torque command value (= power generation amount command / rotation speed / power generation efficiency) is calculated, and a known vector for the inverter is calculated based on the power generation torque command. This can be realized by performing control or the like.
[0046]
In the above embodiment, the power generation range is defined by the engine speed and the engine torque, but values corresponding thereto (the generator speed instead of the engine speed, the combustion pressure or the air amount instead of the engine torque). Alternatively, a throttle opening degree or the like can be used, and a region can be set according to each parameter such as a combination of the engine speed and the throttle opening degree.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a vehicle power supply device according to an embodiment of the present invention.
FIG. 2 is an engine fuel efficiency map.
FIG. 3 is a fuel consumption map showing an increase in fuel consumption associated with a 1 W power increase.
FIG. 4 is a graph showing the relationship between engine fuel efficiency and engine torque.
FIG. 5 is a flowchart showing a control procedure of the generator.
FIG. 6 is a fuel consumption map for explaining an example of changing the power generation range.
FIG. 7 is a map showing basic command values for power generation.
[Explanation of symbols]
1 Vehicle power supply 2 Engine (internal combustion engine)
3 Generator 4 Battery 7 Power control means

Claims (16)

A generator driven by an internal combustion engine to generate electricity;
A battery charged by the power generated by the generator;
A power supply device for a vehicle, comprising power supply control means for controlling a power generation amount of the generator according to an output of the internal combustion engine,
The power control means, when generating electricity with the generator, consumes fuel corresponding to an increase in power of the internal combustion engine and fuel consumption corresponding to an improvement in fuel consumption rate accompanying the increase in power of the internal combustion engine. Set the power generation range from the quantity,
The power generation range is set on the basis of a minimum value of a value obtained by subtracting a fuel consumption amount corresponding to an improvement in fuel consumption rate accompanying a power increase of the internal combustion engine from a fuel consumption amount corresponding to a power increase of the internal combustion engine. In addition, the internal combustion engine is set to a medium speed region and a medium load region,
A vehicular power supply device that causes the generator to generate power when an operating point of the internal combustion engine is included in the power generation range. In the vehicle power supply device according to claim 1,
The power generation range of the vehicle is defined by a rotational speed and torque of the internal combustion engine, or a value corresponding to the rotational speed and a value corresponding to the torque . In the vehicle power supply device according to claim 1 or 2,
The generator is an alternator that has a rotor wound with a field winding and a stator wound with an armature winding, and generates an AC voltage in the armature winding by the rotation of the rotor. ,
The power supply control means includes a regulator that adjusts the generated voltage of the alternator, and controls the power generation amount by changing the adjustment voltage of the regulator . In the vehicle dual power system as claimed in claim 1 or 2,
The generator is an alternator having a rotor around which a field winding is wound and a stator around which an armature winding is wound, and generating an AC voltage in the armature winding by the rotation of the rotor. ,
The vehicle power supply device, wherein the power control means controls the power generation amount by changing a field current passed through the field winding . In the vehicle dual power system as claimed in claim 1 or 2 or 4,
The generator is a multiphase AC rotating machine having a rotor that forms a field and a stator around which an armature winding is wound,
The power supply control means includes an inverter that controls a voltage applied to the armature winding, and controls the power generation amount by changing a torque command value or a power command value for the inverter. Power supply. The vehicle power supply device according to any one of claims 1 to 5 ,
The power supply control device narrows the power generation range as the remaining capacity of the battery increases . In the vehicle dual power system as claimed in claim 6,
A power supply device for a vehicle, wherein a minimum range is set in the power generation range . The vehicle power supply device according to any one of claims 1 to 5 ,
The vehicle power supply device, wherein the power supply control means widens the power generation range as the remaining capacity of the battery is smaller . In the vehicle power supply device according to any one of claims 1 to 8 ,
The vehicle power supply device, wherein the power control means increases the power generation amount as the remaining capacity of the battery is smaller . The vehicle power supply device according to any one of claims 1 to 9 ,
The vehicle power supply device, wherein the power control means reduces the power generation amount as the remaining capacity of the battery is larger . In the vehicle power supply device according to any one of claims 1 to 10,
The vehicle power supply device, wherein the power supply control means changes a torque of the internal combustion engine in accordance with the power generation amount . The vehicle power supply device according to any one of claims 1 to 11,
The vehicle power supply apparatus, wherein the power supply control unit sets a basic amount of the power generation amount according to an operation region of the internal combustion engine . In the vehicle dual power system as claimed in claim 12,
The power supply control device sets the basic amount of the power generation amount to a higher value toward the center of a setting region set according to an operation region of the internal combustion engine . In the vehicle power supply device according to any one of claims 1 to 13,
The vehicle power supply device, wherein the power control means sets an upper limit of the power generation amount. In the vehicle power supply device according to claim 14,
It said power supply control means, wherein the upper limit of power generation amount, the vehicle power supply device and sets according to the operation range of the internal combustion engine. In the vehicle dual power system as claimed in claim 14,
The power supply control device sets the upper limit of the power generation amount according to a request from the internal combustion engine or the vehicle .

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