JPS6022428A - Power source for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Details The present invention relates to a power supply device mounted on an automobile.Prior Art Generally speaking, in recent automobiles, electrical equipment has been promoted.
A large electrical load is placed on the batch (1) -+- battery and generator that supplies power to each of these electrical components, resulting in battery sensitivity 1! L, and the load torque of the generator applied to the engine becomes large, which becomes a cause of a decrease in the fuel consumption rate. In addition, batteries that use a generator as a charging source may be used when the vehicle is parked for a long period of time.
! There is a problem in that when the battery is turned on, self-discharge occurs, causing what is called a dead battery.

Therefore, in the past, solar cells, which do not require any power source, are installed in parallel with the generator as an auxiliary energy source, and the photovoltaic power covers part of the electrical load and also charges the battery. Automotive power supply devices have been developed that allow

However, when taking such measures, for example, when driving a car under a light load during the day, or when parking in the hot sun when the battery is fully charged, the battery may become overcharged.
This creates a new problem of being exposed to
Simply installing a solar cell in parallel with a generator as an auxiliary energy source will not allow effective use of the photovoltaic power of the solar cell in accordance with the load, and it will still be insufficient when a large electrical load is applied. The large load torque of the generator, combined with the engine, makes it impossible to expect a significant improvement in fuel consumption.

Purpose The present invention has been made in consideration of the above points, and it is possible to install a power generation element such as a solar cell or a fuel cell in parallel with the main generator, which does not require any power source, and to change the charging state of the battery and the electrical load state. Accordingly, the aim is to make effective use of the electromotive force of the auxiliary power generating element, prevent overcharging of the battery, and reduce the generator load on the engine, significantly improving the fuel consumption rate. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the automobile power supply device according to the present invention, as shown in FIG.
A generator 3 and a solar cell 4 are connected in parallel, and a sensor S detects the state of charge of the battery 1, and power generation of the generator 3 is controlled according to the detection state of the sensor S, and IG-8W in FIG. 0 indicates an ignition switch, which is configured by providing a control circuit 5 for controlling the input and disconnection of the solar cell 4 to the power supply system.

In the automobile power supply device according to the present invention configured as described above, it is possible to prevent over-discharging or over-charging of the battery 1 when the vehicle is parked with the engine not being driven.5! I
C, it becomes. That is, when the engine 2 is not driven, the sensor S
When it is detected that the battery 1 has not yet reached a fully charged state, the control circuit 5 causes the solar battery 4 to be connected to the power supply system, and injects the light from the battery 1 into the photovoltaic force of the solar battery 4. Therefore, when the vehicle is parked for a long period of time, even if the battery 1 loses its capacity, the solar cell 4 sufficiently compensates for the loss, thereby preventing the battery from running out. Furthermore, when the sensor S detects that the battery 1 is fully charged during parking, the control circuit 5 disconnects the solar cell 4 from the power supply system to prevent the battery 1 from being overcharged.

Also, when the car is running with the engine running, the electrical load 6
When the sensor S detects that the charging voltage of the battery 1 has decreased due to the increase in the load, the control circuit 5 causes the solar cell 4 to be connected to the power supply system and performs field control to increase the amount of power generated by the generator 3. This prevents the battery 1 from becoming over-discharged. Further, when the sensor S detects that the battery 1 is in a fully charged state during running with a light electric load, the control circuit 5 monitors the battery 1 with the sensor S and takes steps to prevent the battery 1 from becoming overcharged.
Switching control for connecting or disconnecting the solar cell 4 from the power supply system and field control for reducing the amount of power generated by the generator 30 are performed.

At that time, in the generator 3, a load torque corresponding to the amount of power generated is applied to the engine 2, reducing the fuel consumption rate. Therefore, in the present invention, the use of the Eri generator 3 is suppressed as much as possible under the control circuit 50. , the photovoltaic power of the solar cell 4 is utilized to the maximum.

FIG. 2 shows another embodiment of the present invention. In particular, in this case, a dedicated battery 7 is provided to store the photovoltaic power of the parallel VC with the solar cell 4, and the battery 7 is connected to the solar cell 4. Switches SW2 and 8W1 are provided to allow the power supply B consisting of a parallel circuit and the power source consisting of a parallel circuit of the battery 1 and generator 3 to be connected to and disconnected from the circuit of the electric load 6, respectively. The control circuit 8 performs switching control of the ELI switches SWI and SW2 while monitoring the respective charging states of the batteries 1 and 7 through the control circuit 5 to prioritize the use of the solar cell 4 ↓5.

That is, in the configuration of this work 5, the control circuit 8
As in the case described above, the battery 1 is controlled by the generator 3 so that it is always fully charged when the vehicle is running. Therefore, battery 1 is connected to engine 2″ft.
Since the battery 1 is charged by the generator 3 serving as the driving source, it is advantageous in terms of fuel efficiency to always maintain the battery 1 in a fully charged state and to prevent it from discharging as much as possible. Also,
The control circuit 8 uses the sensor S2 to monitor the state of charge of the battery 7 and uses the photovoltaic power of the solar cell 4 during parking and driving to prevent the battery from overcharging.
control to store data.

Further, when supplying power to the electrical load 6, the control circuit 8 first turns on only the switch SW2 to supply the power source B to the electrical load 6 preferentially. Therefore, power supply B
is being applied preferentially to the electrical load 6, the battery 1
If the generator 3 is in a fully charged state, the generator 3 can be brought into a no-load operating state and its power generation can be stopped. Next, the control circuit 8 outputs the battery 7 from the sensor output of the sensor S2.
When it is detected that the power consumption has reached the usage limit,
Turn on the switch SWI and connect the power supply At1 to the electrical load 6.
At the same time, the generator 3 is put into a load operation state, and the generated power and the photovoltaic power of the solar cell 4 are supplied to the electric load 6. Note that if power is supplied from the battery 1 when the power source A is applied to the electric load 6, the battery 1 will have to be re-charged by the generator 3, which is disadvantageous in terms of fuel efficiency. becomes. Therefore, in the present invention, the control circuit 8 controls the excitation side of the generator 3 so that the charging voltage of the battery 1 does not decrease, and the electric load 6 is controlled by the generated power and the photovoltaic power of the solar cell 4. 5 control means for finally supplying power from the battery 1 when the electric load 6 becomes heavy and the generator 3 and the solar cell 4 cannot cover the power supply. I try to take it.

Normally, the charging speed of a battery is very slow when its charge level is below 60%, gradually becomes faster when its charge level is above 60%, and when it is above 80%, it charges quickly with a small supply of power. be able to. therefore,
If the usage limit of the power consumption of the battery 7 is set to 60% or less, it will take time to recharge and the life of the battery will be shortened. Therefore, when adopting the configuration shown in Fig. 2, it is necessary to set the usage limit of the battery (7) to about 80%, but only about 20% of the charge amount from the photovoltaic power of the solar cell 4 is used. I become unable to do so.

Therefore, as another embodiment of the present invention, a battery 1 having the structure shown in FIG. When the battery 1 is charged by the generator 3, approximately 80% of the charge is considered to be fully charged, and when the solar cell 4 is used to charge the battery 1, the battery 1 is considered to be fully charged. The amount of charge is regarded as a fully charged state, and a control means is taken to stop charging when each fully charged state is detected by the sensor SIC.However, by adopting such a configuration, , First, when the car is running, power is supplied to the electric load 6 by the solar battery 4.
If this is insufficient, the solar cell 4 will additionally supply the amount of power stored in the battery 1. During this time, the generator 3 is in a state where power generation is stopped (8). Next, the charge v1t of battery 1 is 8
When the power decreases to about 0%, the generator 30 starts generating power, the generated Mc power is supplied to the electric load 6, and the power supply from the battery 1 is stopped. Furthermore, the electric load 6 becomes heavier, and the power generated by the generator 3 and the solar battery 4 increase.
When the amount of photovoltaic power cannot be met, power supply from the battery 1 is restarted. When the electric load 6 becomes lighter again, the battery 1 is charged by the generator 3 and the solar cell 4, as shown in FIG. After that, the solar cell 4 continues to charge the battery until the amount of charge reaches 100%. Note that in FIG. 3, a indicates a charging area by the generator 3 and the solar cell 4, and b indicates a charging area by the solar cell 4 only. Therefore, the photovoltaic power of the solar cell 4 stored in the battery 1 can be effectively utilized, and the solar cell 4 can be charged from about 80% of the charge amount of the battery 1.
This can be done efficiently by only using chisel. It goes without saying that even in this case, the amount of power generated by the generator 3 is suppressed as much as possible, and the fuel consumption rate of the engine 2 can be improved.

As described above, in the automotive power supply device according to the present invention, a battery, a generator driven by the engine, and a non-driven power generation element that does not apply a load to the engine are connected in parallel to the electrical load, and the state of charge of the battery is It is constructed by providing a control circuit that controls the power generation of the generator according to the detection signal of the sensor that detects the It would be great if the electromotive force of the power generating element installed in the generator could be effectively used to prevent over-discharging and over-charging of the battery, as well as reducing the engine load by suppressing the power generation of the generator as much as possible. It has several advantages.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing one embodiment of an automobile power supply device according to the present invention, FIG. 2 is a Zoroku block diagram showing another embodiment of the invention, and FIG. 3 is a battery in the automobile power supply device of the present invention. FIG. 1... Battery 2... Engine 3... Generator 4... Solar battery 5. Death: Control circuit 6: Electrical load 7: Battery S: Bacterisensor applicant Kiyoshi Torii (11) Tako (12)

Claims (1)

[Claims] A non-driven power generation element is connected in parallel to the electric load when the battery and engine drive are generated, and power generation of one generator is controlled in response to a detection signal from a sensor that detects the light weight state of the battery. A power supply device for an automobile is constructed by providing a control circuit for controlling the connection and disconnection of the power generation element to the power supply system.