JP2000326805A - Power device for vehicle or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overloading of a battery and an alternator used as a power supply for each load installed in a vehicle or the like and to save battery power. SOLUTION: This power device has a plurality of loads connected thereto via a power line and classified into a first group of loads for which drive cannot be temporarily stopped during operation of a vehicle and a second group of loads for which drive can be temporarily stopped. An order of precedence for temporary stops is determined for the second group of loads which can be temporarily stopped. A load power circuit 12 connected to each of the plurality of loads at the position nearest to the power device is provided with a load current detector 24, which temporarily stops the second group of loads according to the order of precedence if a load current equal to or greater than a predetermined current flows in the load power circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an automobile, an aircraft,
A power supply device used to drive loads of various electronic devices and the like mounted on a vehicle such as a ship (hereinafter referred to as a vehicle or the like), and particularly for a battery and an alternator used as a power source of each of the loads. The present invention relates to a power supply device used for a vehicle or the like that prevents an overload of the vehicle beforehand and saves power of a battery.

[0002]

2. Description of the Related Art Recently developed vehicles and the like are:
For example, large-current load facilities such as power windows, fog lamps, rear defoggers, air conditioners, seat heaters, and the like have become commonplace. For this reason, batteries, alternators, etc., as power supplies used to drive those large-current loads, are large. In addition, there are problems such as an increase in the number of wires, an increase in the weight of the vehicle accompanying an increase in the thickness of the power supply line, and the like.

In recent vehicles and the like, the control circuits required to control the loads have become more complicated with the installation of various types of loads, so that these complicated control circuits have been simplified. In-vehicle multiplex communication network systems (LANs) have been developed as a measure for achieving this.

As a well-known example of the in-vehicle multiplex communication network system, there is a network system as shown in FIG. 2, for example. In the following, this known network system will be described. L1 to L6 are on-vehicle loads, and these loads are installed at the optimum positions of the vehicle body corresponding to their use positions. Each of L6 includes control units C1 to C6.

The control units C1 to C6 are connected to a communication line A
Are connected via LAN, and the control units C
A desired load can be driven by any one of the control units 1 to C6.

Reference numerals 1A and 1B denote a battery and an alternator provided in an engine room of a vehicle body. The battery 1A and the alternator 1B constitute a power supply device 2. And the battery 1
A output line 3A and alternator 1B output line 3B
Are connected to the main control unit C1 closest to the power supply device 2, and further connected to the respective loads L1 to L6 via the power supply line 4 connected to the output side of the control unit C1. ing.

The main control unit C among the control units C1 to C6 provided for each of the loads,
The control units C2 to C6 except for 1 are sub-control units, and the selected loads can be driven by selecting and operating these sub-control units.

[0008]

In such an in-vehicle multiplex communication network system, it is possible to selectively drive each of the on-vehicle loads by operating an arbitrary control unit. When the loads are driven at the same time, the load current to the power supply increases, causing an overload state of the power supply, causing damage to the power supply or running out of battery.

As means for preventing damage to the power supply device due to such overload, a large-capacity large battery and alternator may be mounted. Due to the increase in weight and increase in weight, there is a problem in securing a mounting space for the battery in the engine room, and various problems associated with an increase in the total weight of the vehicle body occur.

[0010] Even if the above-mentioned power supply device is overloaded, the withstand current of the power supply line connecting the power supply device and each load must be taken into consideration. Use of the power supply line is forced, and there is a problem that the whole shape of the harness for wiring in the vehicle body is increased, or the total weight of the harness is increased.

The present invention has been made in view of such a conventional problem. In a multiplex communication network system in a vehicle, a total load current flowing through a plurality of loads related to the system is detected, and the load current is detected. When the value exceeds the rated maximum value of the power supply, the drive of one of the loads is regulated to prevent the power supply from becoming large and the power line to be used to be excessively thick. It is an object of the present invention to make it easy to secure the space and to reduce the above system.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, there are provided a plurality of loads connected to a power supply via a power supply line, and a plurality of loads connected to the communication line and the communication line. One or a plurality of sub-control units for controlling the load based on a control signal received via the control switch, and a signal for receiving the operation switch signal and issuing the control signal to the sub-control unit via the communication line. In a multiplex communication network system including a main control unit, a control function for supplying a load control signal to the communication line is a power supply device used in a vehicle or the like provided in the main control unit. And

According to a second aspect of the present invention, a plurality of loads connected to a power supply device via a power supply line and the loads based on a control signal connected to the communication line and received via the communication line. A multiplex communication network system in a vehicle including one or more sub-control units to be controlled and one main control unit that receives the signal of the operation switch and issues the control signal to the sub-control unit via the communication line , A plurality of loads connected to a power supply device via the power supply line can be temporarily stopped in a first load group whose driving cannot be temporarily stopped during driving of the vehicle, and in a first load group. In the second load group that can be temporarily stopped while being classified into the second load group, a priority order for temporarily stopping is determined in advance. Further, a load current detector 24 is provided in the load power supply circuit 12 connected to each of the plurality of loads in the main control unit at a position closest to the power supply device, and the load current detector 24 Circuit 1
2 is a power supply device used for a vehicle or the like that temporarily stops the second load group according to its priority when a predetermined load current or more flows through the power supply device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the circuit diagram shown in FIG.

The circuit diagram shown in FIG. 1 mainly shows a main control unit 11 corresponding to the main control unit C1 in the intra-vehicle multiplex communication network system shown in FIG.
Since the other circuit configuration can use the intra-vehicle multiplex communication network system shown in FIG. 2 as it is, the main control unit 11
Will be described only.

The main control unit 11 has a load power supply circuit 12 (a portion indicated by a thick line in the drawing).
The input side of the load power supply circuit 12 is connected to a main fuse 13.
Are connected to the battery 14 and to each of the alternators 15.

The output side of the load power supply circuit 12 is connected via respective sub-fuses 16, 17, 18 to, for example, a load group 19 of engine electric components, a sub-control unit C
2, a power supply line 4a for supplying power to loads L2 and L3 connected to C3, and a power supply line 4 for supplying power to loads L4 to L6 connected to sub-control units C4 to C6.
b.

Further, a power supply line 4c for supplying power to, for example, the air conditioner L1 is connected to the output side of the load power supply circuit 12 via a fuse 20.

On the other hand, as the loads L2 to L6 connected to the sub-control units C2 to C6, for example, a door lock motor,
Appropriate loads such as a power window motor, a rear defogger, a seat heater, a mirror heater, and a fog lamp are set.

Each of these loads includes a first load group (for example, a headlamp or the like) which is required to maintain the supply of power during operation (during operation) of the vehicle body.
A second load group (for example, a fan motor of an air conditioner, etc.) that is not necessarily required during the operation of the vehicle body (during operation) and that is allowed to cut off the power or reduce the output.
Can be classified.

A drive control circuit 23 for the relay 22 is connected to the communication line A and a signal input line B connected to an operation switch for selectively driving the loads. .

Reference numeral 24 denotes a load current detector for detecting a current flowing through the load power supply circuit 12. When the load current detector 24 detects a load current value equal to or greater than a set current value, the load current detector 24 sets a value equal to or greater than the set value. The CPU 23A in the drive control circuit 23 operates based on the current value.
The power supply to the second load group is temporarily cut off or limited in accordance with the priority of the second load group which has already been determined by the above, and the total load current value flowing through the load power supply circuit 12 is reduced. This is to reduce it.

As can be understood from the above description, in the embodiment of the present invention, a plurality of loads connected to the power supply device via the power supply line, and a load connected to the communication line and received via the communication line One or a plurality of sub-control units for controlling the load based on the control signal, and one main control unit for receiving the signal of the operation switch and issuing the control signal to the sub-control unit via the communication line. A plurality of loads connected to a power supply device via the power supply line, wherein a plurality of loads connected to the power supply device via the power supply line cannot be temporarily stopped during driving of the vehicle; Are divided into a second load group that can be temporarily stopped, and a temporary stop is performed in the second load group that can be temporarily stopped. Leave prioritize to load the power supply circuit is further connected to said plurality of respective loads to the main control unit at a position closest to the power supply device 1
2, a load current detector 24 is provided.
4 is a vehicle power supply device for temporarily stopping or limiting the second load group according to its priority when a load current of a predetermined value or more flows through the load power supply circuit 12.

Therefore, according to the power supply device for a vehicle, it is possible to prevent the battery from being overloaded, thereby preventing the vehicle battery and the alternator from being enlarged. It is easy to secure the installation space for the vehicle, and it is possible to reduce the weight of the in-vehicle product. In addition, since overdischarge of the battery can be prevented, the durability of the battery can be improved.

Further, since the value of the current flowing through the load power supply circuit 12 can be regulated, the thickness of the wire harness used as the load current circuit 12 can be prevented from becoming too thick, thereby reducing the weight of the wire harness and wiring. Ease of work, economy, etc. are improved.

[0026]

As described above, according to the power supply device for a vehicle of the present invention, it is possible to suppress overload on the power supply device such as a battery installed in a vehicle such as a vehicle. There is no need to provide such a device, and it has the effect of reducing the total weight of the vehicle body, reducing the space for the power supply equipment, and contributing to the economical efficiency of the power supply device.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a power supply device according to the present invention.

FIG. 2 is a schematic circuit diagram of a multiplex communication network system in a vehicle or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Main control unit 12 ... Load power supply circuit 13 ... Main fuse 14 ... Battery 15 ... Alternator 16 ... Subfuse 17 ... Subfuse 18 ... Subfuse 20 ... Fuse 22 ... Relay 23 ... Drive control circuit 24 ... Load current detector

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G05F 1/10 304 G05F 1/10 304M H02J 7/00 H02J 7/00 P 302 302B F-term (Reference) 5G003 AA07 BA01 CC02 DA06 DA14 DA17 DA18 FA06 GC05 5H410 CC02 DD02 DD05 EA28 EB01 EB25 EB37 FF05 FF26 LL06 LL15 LL18

Claims (2)

[Claims] 1. A plurality of loads connected to a power supply device via a power supply line, and one or more sub-units connected to a communication line and controlling the load based on a control signal received via the communication line. A control unit and a multiplex communication network system in a vehicle including one main control unit that receives a signal of an operation switch and issues the control signal to the sub-control unit via the communication line; A power supply device used for a vehicle or the like, wherein a control function for supplying to a communication line is provided in the main control unit. 2. A plurality of loads connected to a power supply device via a power supply line, and one or more sub-units connected to a communication line and controlling the load based on a control signal received via the communication line. A control unit and a multiplex communication network system in a vehicle including one main control unit that receives a signal of an operation switch and issues the control signal to the sub-control unit through the communication line. A plurality of loads connected to the power supply device cannot be temporarily stopped during driving of the vehicle.
And a second load group capable of temporarily stopping the driving, and of the second load group capable of temporarily stopping the driving, a priority is given to temporarily stopping the driving. The order of the load power supply circuit (1) connected to each of the plurality of loads is determined in the main control unit at a position closest to the power supply device.
2) a load current detector (24) is provided, and when the load current detector (24) causes a load current of not less than a predetermined value to flow through the load power supply circuit (12), the second load group is set to:
A power supply device used for a vehicle or the like, which is temporarily stopped according to the priority order.