JPH03190533A - Power supply system in automobile - Google Patents

Abstract

PURPOSE:To maintain safety by detecting that a bonnet has been opened, and operating an alarm means when stopping the power supply from a high power source or continuing it. CONSTITUTION:A switch Sa is the switch interlocking with the opening and closing the bonnet of an automobile, and it maintains the closed condition unless it becomes a closed condition. To inspect it, a manual switch Sb is to be operated, whereby the contacts C1 and C2 are closed, whereby power is supplied and by the closing of contacts C3 and C4 an indicator lamp LP 44 and BIL 42 are made to operate. Moreover, for example, a bonnet opening/closing switch So becomes open by bonnet opening, and the excitation of an exciting coil L1 vanishes, and the switch Sa opens. That is, the power supply circuit using an inverter INV 24 is switched on or switched off, interlocked with the opening/ closing of the bonnet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a power supply system for automobiles, and particularly to a high-voltage power supply system or a power supply system that takes safety measures into account when high-voltage power supplies are mixed.

[Conventional technology]

For example, Japanese Patent Application Laid-Open No. 63-253897 describes a power generation mechanism for automobiles that can obtain power of A, C, 100V by operating the engine even when the automobile is running or stopped.

Specifically, a generator and an inverter are combined to obtain commercial frequency power.

Furthermore, Japanese Patent Application Laid-Open No. 64-5335 discloses a dual electric system for a vehicle. This includes a first engine-driven generator and a second engine-driven generator, and divides the load into critical loads and non-critical loads.

Power is supplied to important loads using an electrical system that can be supplied from any of the generators mentioned above. In other words, for important loads, even if one of the two generators breaks down, it is a dual system power supply system that allows power to be supplied from the other generator.

Furthermore, there is Special Publication No. 56-22238. This describes a device that uses the alternating current generator installed in an automobile to obtain a general-purpose power output.

It can be used as a general-purpose power source so that power tools can be used at the work site.

However, in addition to being used as a power source for these power tools, the power source for vehicles is not limited to the conventional 12VD, C, and is moving toward increasing the voltage for the purpose of downsizing electrical components and reducing the volume of wiring harnesses. Various considerations are being made.

[Problem to be solved by the invention]

However, although the above-mentioned conventional technology allows it to be used as a high voltage power supply, no consideration is given to safety measures. In addition, in the above conventional technology, rather than using high voltage as a power source for electrical components, A, C, 10
0V is mainly provided for external loads.

For this reason, there is no mention of stability measures against high voltage.

An object of the present invention is to provide a power supply system for a vehicle that takes into account safety measures when high-voltage power supply is used with the aim of downsizing and space saving of electrical components.

[Means to solve the problem]

The present invention aims to achieve the above objectives.

A distinctive feature of this system is that the power supply system takes safety into account for maintenance personnel.

Specifically, the high-voltage circuit was wired centrally, with no exposed parts, and a complete protective cover was used. Furthermore, a means was provided to automatically turn off the high-voltage power supply when the bonnet was opened for maintenance inspection. In order to inspect the high-voltage circuit, we installed a means to supply power to the high-voltage circuit using a manual set.

Also, the high voltage circuit is wired as far away as possible from the opening/closing side of the bonnet.

[Effect]

Safety is maintained by detecting that the bonnet has been opened for inspection and maintenance, and when stopping or continuing power supply from the high-voltage power source, an alarm is activated to alert inspection and maintenance workers. I can do it.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is the engine, 10 is the ACG 2° rectifying means 4. It is a power source including a voltage regulator 6 and also a means for charging the battery 20.

FIG. 1 shows an example of a power supply system using a multi-type power source including a battery 20. In FIG. Load 30 beams designated Ll, C.

A low-voltage, high-current load supplied with 12V, placed near the battery to minimize loss.

Load 32 beams, C, 12V (7) Convert voltage, D, C
.

It is a load that supplies power with a voltage higher than D, C, or 12V, such as 24V or 48V. An inverter 24, designated INV, obtains the desired AC power from C, 12V. A.C.
The power supply voltage is, for example, 100v50H, same as commercial power supply.
z (or 60 Hz) is suitable, but this can be arbitrarily selected. However, considering the use of commonly used electric motors, etc., it seems that 100V has a wider load limit.

The power supply circuit of INV24 will be explained. Switch Sa
is a normally closed switch linked to the opening and closing of a car's hood, and remains closed unless the bonnet is opened. Therefore, if the normally closed switch Sa is opened for inspection or preparation, the normally closed switch Sa will be open, so in order to inspect this power supply circuit, it is necessary to configure a circuit that will supply voltage from INV24 again. Don't do it. It is manual operation switch S1. By manual operation. In this embodiment, this manual operation switch Sb is a contact point C1l of the main circuit.
The contacts Cs and Ca of C2 and the auxiliary circuit are also closed. Power is supplied to the main circuit by opening CI and C2, and Ca, Ca
By closing, the lamp display LP indicated by 44 and the bonnet interlock 13IL circuit indicated by 42 are operated.

The lamp display LP may be, for example, as shown in FIG. 3.The lamp display LP 644a is a lamp display or a blinking display to call attention to the fact that high voltage power is being supplied even though the bonnet is in an open state. Further, 44b lights up a display board or the like provided in the engine room to alert the maintenance and inspection person, similarly to 44a.

Bonnet interlock BIL is manual operation switch Sb
This is a means for applying a mechanical interlock to prevent the bonnet from being closed when the contact Cl-4 is closed. There is also a method of interlocking in conjunction with switch S&, or a method of interlocking by energizing BIL.

Further, as a means for opening the power supply circuit of the INV by opening the bonnet, for example, the method shown in FIG. 2 can be considered. So is a hood open/close switch, and when the bonnet is opened, So is also opened. Along with this, the excitation coil L1 is no longer excited, so the switch Sa is opened. R may be a resistance, or other display means may be used in combination. On the other hand, S.

If a circuit is constructed using a contact that is closed when the bonnet is open and the bonnet is open, the switch Sa will function as a normally closed switch, and by the excitation of Lx by closing Se,
Alternatively, the switch Sa may be opened. In other words, the INV power supply circuit is turned on and off in conjunction with opening and closing of the hood.

FIG. 1 also shows an example of centralizing load selection based on power supply voltage. Like load 3o, C.

The load supplied from 12V is concentrated near the battery 20. The average distance is indicated by Q as a dotted line. On the other hand, in the case of medium voltage 1, such as C, 24V, or 48V, even if there is a load to which the same power must be supplied, the location 12. It is possible to centralize the engine room, and this also leads to more effective use of the volume of the engine room. Therefore high voltage power supplies, e.g. A, C.

In the case of 100V, the load can be concentrated further away. FIG. 1 also shows that load distribution having the relationship Ω<Q, ×QH can be achieved depending on the voltage.

For example, a load Lx installed near the battery
Examples include headlamps and other lamps, ignition coils, etc. The load LH group includes power window motors, wiper motors, blower motors, and the like. In addition, for those with intermediate voltages, choose ones that can be made smaller by increasing the voltage.

If the INV power source 24 is comparable to a commercial power source, it is desirable to use duct wiring, especially duct wiring with a waterproof seal. FIG. 4 shows an example of this, and it is preferable to cover the wiring with a duct 50. 52 is wiring.

FIG. 5 shows another embodiment of the present invention, in which the high-voltage power supply is not automatically cut off when the bonnet is opened, but the alarm lamp is turned on while the power supply is maintained.

BS is a bonnet switch, which is closed when the bonnet is opened. When the BS is closed, the high-voltage power supply alarm lamp LP^ lights up or blinks to alert the inspector.The power supply main switch Se is a manually operated switch that maintains a normally closed state and can be opened and closed by manual operation. S
When it is opened by operating e, power is no longer supplied to the BS and LP8, and the alarm lamp also goes out.

This method is convenient for inspecting high voltage circuits with the bonnet open.

Although FIG. 5 shows an example in which there are 24 power supplies, the same applies even if there are 22 power supplies. However, in the case of the power supply 24, it is better to use two-wire wiring instead of grounding one end to the vehicle body.

〔Effect of the invention〕

The present invention can improve safety during inspection and maintenance even when using a high-voltage power supply system.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an alarm lamp and display circuit when power supply is started by a manual operation switch, and Fig. 3 is a block diagram showing the switch S & when the hood is opened. A diagram showing an example of a switch,
FIG. 4 is a diagram showing an example of duct wiring, and FIG. 5 is a diagram showing another embodiment of the present invention. 10...Power supply including regulator, 22...DC/
DC converter, 30, 32. 34...Load, S & Figure 2 Figure 5 Figure 3

Claims (1)

[Scope of Claims] 1. In a vehicle power supply system that includes a high voltage power supply, a high voltage power supply is specified in advance, and a switch means is provided which is activated depending on the open/closed state of the hood of the vehicle. 1. A power supply system for an automobile, characterized in that when the switch is in an open state, power supply from the corresponding predetermined power source is stopped by actuation of the switch. 2. A power supply system for an automobile according to claim 1, characterized in that the actuation of the switch activates an alarm means to continue power supply. 3. A power supply system for an automobile as set forth in claim 1, further comprising a manually operated power supply switch for restarting power supply from the power supply interruption state. 4. A power supply system for an automobile according to claim 3, characterized in that an alarm means is activated when power supply is started by operating the manual operation switch. 5. A power supply system for an automobile according to claim 4, wherein the alarm means is lighting or blinking of an alarm lamp. 6. Claim 3 states that when power is supplied by operating the manual operation switch, an interlock means is provided to prevent the bonnet from closing unless the power supply is stopped by the manual operation switch. Characteristic power supply system for automobiles. 7. In a vehicle power supply system that includes a high voltage power supply, the load of the predetermined high voltage power supply is characterized in that the distance from the power supply to the end of the load is larger than that of other power supplies. power supply system for automobiles.