JPS63255152A - Electric load controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent the exhaustion of battery power by installing a voltage detecting means for detecting the reduction of voltage of the battery mounted on a vehicle and installing a switch means which receives the voltage reduction detection signal and cuts off the supply of electricity into an electricity feeding line at least for a part of the electric load. CONSTITUTION:A fundamental electricity feeding line 2, the first and second electricity feeding lines 3 and 4 are wired with a battery 1 mounted on a vehicle, and the fundamental electricity feeding line 2 is connected with the battery 1 through an ignition switch 5, and electricity can be supplied mainly to a starter. The first electricity feeding line 3 is connected with the battery 1 through a switch means 8, and the electric load 9 such as room lamp and a radio set is connected with the electricity feeding line 3. A voltage detecting means 6 and a keyless entry means 7 are arranged in parallel in the second electricity feeding line 4. When the voltage detecting means 6 detects that the battery voltage reduces less than a prescribed limit voltage, the relay coil 14 of the switch means 8 is allowed to conduct to open a switch 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrical load control device for a vehicle, and particularly to measures against battery deterioration.

(Prior art) There is a technology to prevent battery deterioration in keyless entry systems installed in vehicles (Japanese Patent Laid-Open No. 60-11
(See Publication No. 9879). In other words, when the unique signal from the transmitter carried by the vehicle driver matches a preset unique signal, the door can be unlocked by turning on a switch near the vehicle door. In this system, even if the switch is manipulated inadvertently, if the number of times it is determined that the signals do not match exceeds a certain value, the door unlocking operation using this switch is prohibited for a certain period of time. Therefore, wastage of power due to tampering with the switch can be prevented.

(Problems to be Solved by the Invention) In recent years, vehicles have tended to be equipped with many electrical components such as radios, clocks, room lamps, electric mirrors, electric parking brakes, etc. in addition to the above-mentioned keyless entry system. However, battery deterioration is caused not only by simple pranks, but also by operating current or dark current flowing through the electrical components mentioned above, or by forgetting to turn off the radio or room lamp. In such a case, for example, even if you try to activate the keyless entry system, the battery voltage will become too low and you will not be able to unlock the door.
Problems arise, such as the driver being forced to break the door lock in order to enter the vehicle, and even vehicles not equipped with a keyless entry system being unable to start the engine.

The present invention aims to provide an electrical load control device for a vehicle to solve the above-mentioned problems.

(Means for Solving the Problems) The electric load control device for a vehicle of the present invention connects a voltage detection means to the battery of the vehicle to inspect a drop in voltage of the battery, and at least The present invention is characterized in that a power supply line for some of the electrical loads is provided with a switch means for cutting off the power supply in response to a voltage drop signal from the voltage detection means.

(Function) In the above electrical load control device, when a battery voltage drop is detected, the power supply to the electrical load that causes the voltage drop is cut off, thereby preventing excessive deterioration of the battery. Become.

(Effects of the Invention) Therefore, according to the present invention, the voltage detection means is connected to the battery, and the power supply line for the electric load is provided with the switch means that cuts off the power supply upon receiving the voltage drop signal from the voltage detection means. You can secure the power necessary to operate the keyless entry system to open the door, open the hood from the passenger compartment to change the battery, or secure the power necessary to start the engine and start the vehicle. It becomes possible to transport the vehicle to a maintenance shop or the like without any trouble.

(Example) Hereinafter, five embodiments of the present invention will be explained based on the drawings.

FIG. 1 shows the overall configuration of the embodiment.

In the figure, 1 is a battery of the vehicle, and a basic power supply line 2, a first power supply line 3, and a second power supply line 4 extend from this battery.

The basic power supply line 2 is connected to the battery 1 via the ignition switch 5, and mainly supplies power to the starter.

The first power supply line 3 is directly connected to the battery 1, and a voltage detection means 6 and a keyless entry means 7, which are energized from the battery 1, are provided in parallel on the first power supply line 3.

The second power supply line 4 is connected to the battery 1 via a switch means 8, and the second power supply line 4 is provided with an electric load 9 such as a clock, a room lamp, a radio, etc.

The voltage detecting means 6 includes a voltage detecting section 11 that detects the voltage of the battery 1 as shown in FIG. ) limit voltage setting unit 12 for setting
and a comparator 13 which provides a voltage drop signal to the switch means 8 when the battery voltage reaches the limit voltage.

Further, the switch means 8 is connected to the relay coil 14 and the switch 1.
5, the relay coil 14 is energized by the voltage drop signal, so that the switch 1
5 is turned off to cut off power supply to the electric load 9.

The keyless entry means 7 locks or unlocks the door 19 of the vehicle 18 in response to a unique signal transmitted from a portable transmitter 16 shown in FIG. 3 and a signal from an operation switch 17. The portable transmitter 16 is carried by the driver, and the receiver 21 that receives the unique signal from the transmitter 16 is installed in the instrument panel section 22, and the operation switch 17 is located next to the outer handle of the door 19. It is provided. As shown in FIG. 4, the keyless entry means 7 compares the unique signal received by the receiver 21 with a preset unique signal, and when both signals match, and a unique signal matching means 23 that outputs a matching signal.

It is provided with an actuator driving means 25 for driving the door lock actuator 24 in response to the coincidence signal and the operation signal from the operation switch 17.

Therefore, in the electrical load control device having the above configuration, if the driver forgets to turn off the room lamp or radio while the door 19 is locked using the keyless entry system and the driver is away from the vehicle 18, the TL electrical load may be turned off. When wasteful power is consumed and the voltage of the battery 1 decreases and reaches the limit voltage, the switch means 8 is turned off by the voltage drop signal from the voltage detection means 6. As a result, the power supply from the battery 1 to the electric load 9 is cut off, and the voltage of the battery 1 is maintained at about the limit voltage.

By using the keyless entry system, the door 19 can be opened without any trouble, the bonnet 26 can be opened from the passenger compartment, and the battery 1 can be replaced.

In addition, in the above embodiment, a battery voltage that does not interfere with the operation of the keyless entry system is secured, but it is also possible to secure a voltage necessary for starting the engine or operating other selected electrical components. .

Moreover, although the above embodiments apply the present invention to a vehicle equipped with a keyless entry system, it goes without saying that the present invention can also be applied to vehicles not equipped with such a system.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, with FIG. 1 being a circuit diagram showing the overall configuration of an electrical load control device, and FIG. 2 being a block diagram showing the relationship between voltage detection means and an electrical load. FIG. 3 is a plan view showing the relationship between the vehicle and the portable transmitter of the keyless entry system, and FIG. 4 is a block diagram showing the configuration of the keyless entry system. 1... Battery, 2... Basic power supply line, 3... First power supply line, 4... Second power supply line.
Power supply line, 5...Ignition switch,
6... Voltage detection means. 7... Keyless entry means, 8... Switch means, 9... Electric load, 11...
・Voltage detection section, 12...Limit voltage setting section, 13
...Comparison section, 14...Relay coil, 1
5...Switch, 16...Mobile: 1 transmitter, 17...Operation switch, 18...
・Vehicle, 19...Door, 21...Receiver, 22...Instrument panel section, 23
... Unique signal verification means. 24...Lock actuator, 25...Mountain actuator drive means, 26...Bonnet. Figure 3 Figure 4

Claims (1)

[Claims] (1) Voltage detection means for detecting a drop in voltage of the battery is connected to the battery of the vehicle, and the voltage drop caused by the voltage detection means is connected to a power supply line extending from the battery to at least a part of the electrical load of the vehicle. An electrical load control device for a vehicle, comprising a switch means for cutting off power supply upon receiving a signal.