JPH1092289A - Vehicle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle control device excellent in vibration resistance and having improved reliability by substituting a part of printed wires with fuses on a printed circuit mounting the electronic parts of the vehicle control device. SOLUTION: In a vehicle control device 1 constituted of a printed circuit, printed wire fuses 11a, 11b, 11c are used at a portion of a power feed printed wire 10 to a vehicle control device 6 near a connector 13, and they are connected to the connector 13 via a wiring material 12∥a. Printed wire fuses 11d, 11e, 11f are likewise used at a portion of a signal transmission printed wire to a vehicle control device 7 near a connector 14, and they are connected to the connector 14 via a wiring material 12b. The printed wire fuses 11a-11f are made narrower in width than the other printed wire 10 to be easily fused by an overcurrent. When a short-circuit state occurs on the vehicle control devices 6, 7 or cables 8, 9, one of the printed wire fuses 11a-11f is fused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device mounted on a mobile object having a severe anti-vibration environment such as a vehicle, and a control device for a vehicle using a circuit system suitable for short-circuit protection of an interface signal line and a power supply line with peripheral devices. About.

[0002]

2. Description of the Related Art A circuit using a method in which a part of a printed wiring is used as a fuse and the wiring is cut off a path is not found in a conventional vehicle control device.

[0003]

The vehicle control device comprises a plurality of control devices such as a drive control device, a braking control device, and an operation state monitoring device. These devices are interconnected by cables, It performs signal delivery and power supply. For this reason, a short circuit may occur due to an erroneous connection between devices or a failure of a circuit component of a partner control device. In such a case, each control device needs to have a protection function for preventing a secondary failure. The control device is generally an electronic circuit, and often uses a fuse having high-speed characteristics and breaking characteristics with a small current. However, a fuse having a small current and a high-speed fusing characteristic has a problem in vibration resistance and is not very suitable for a control device of a moving body such as a vehicle. Further, since the fusing current is small, there is a problem in reliability such that the fuse fusing material is thin and the fusing material is easily cut due to a mechanical variation in a structure for fixing the fusing material.

In addition, there are many interfaces between devices, and it is often difficult to insert a fuse into each signal line because of the large number of components.

It is an object of the present invention to provide an inexpensive fuse circuit system which is excellent in vibration resistance and can be used for a control device of a moving body.

[0006]

According to the present invention, a part of a printed wiring on a printed circuit is used as a fuse. In recent years, thinning of wiring patterns and high precision of pattern width have been progressed for printed wiring boards. For laminated printed boards generally used for industrial equipment and the like, the pattern width is 0.1 mm or less, and the pattern width precision is 0 mm. Production within .01mm is now possible. FIG. 2 shows the relationship between the conductor width of the laminated printed board and the current value when the printed wiring is blown. By reducing the pattern width, fusing can be performed even when a current of several amperes is generally required for protection of a printed circuit.

The printed wiring fuse has a certain length, the pattern width is narrowed as compared with the printed wiring width of the same path, the resistance of the printed wiring is partially increased, and the printed wiring of a portion determined by a preset current value is used. Can be blown.

Further, a plurality of printed wiring fuses are installed on the same wiring path, and are connected to any one of the printed wiring fuses. If the printed wiring fuse blows due to a short circuit, the connection to the remaining printed wiring fuses can be changed.

In a printed wiring fuse, the fuse portion is less susceptible to thermal influence from the surroundings, and the fusing characteristics are determined only by the current value flowing through the wiring fuse, and the same fusing characteristics are exhibited between different printed circuits. It is desirable. For this reason, parts having a large heat capacity, such as a power supply and a ground layer, in the multilayer laminated printed board are arranged apart from the printed wiring fuse. An inner layer of the printed wiring board may be removed, and a printed wiring fuse may be provided on the surface of the printed wiring board.

According to the above configuration, when a short circuit occurs on a signal line or a power supply line connected to an external device, a printed wiring fuse previously provided in a printed circuit of a vehicle control device at the time of circuit design is blown.

By branching a pattern on a printed wiring and providing a plurality of printed wiring fuses, connection switching with a plurality of pattern fuses becomes possible, and a plurality of fuse replacements become possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The vehicle control device 1 is composed of a printed circuit, and includes a power supply 2, a transistor 3 for interfacing with another control device, a control circuit 4 for the transistor 3, and an IC.
5 a and 5 b are mounted and connected by a printed wiring 10. The vehicle control device 1 supplies power to the vehicle control device 6 via a cable 8. The control device 1 transmits a signal of the transistor 3 to the vehicle control device 7 via the cable 9. The cables 8 and 9 are connected to a printed wiring board of the vehicle control device 1 by connectors 13 and 14.

The printed wiring fuse 11 is located near the connector 13 of the printed wiring for power supply to the vehicle control device 6.
a, 11b, and 11c are provided, and are connected to the connector 13 via the wire resistant material 12a. Printed wiring fuses 11d, 11e, 11f are connected to the connector 14 via a wiring member 12b near the connector 14 of the printed wiring for signal transmission to the vehicle control device 7. The printed wiring fuses 11a to 11f are narrowest in width as compared with other printed wirings 10, and are easily blown by an overcurrent. Therefore, the vehicle control devices 6, 7 or the cable 8,
9 and the like, when the short-circuit state occurs, the printed wiring 10 in the printed circuit of the vehicle control device 1, the transistor 3, the power supply 3, and the like are not damaged, and the printed wiring fuse 11
Among the printed wiring fuses a to 11f, one of the printed wiring fuses connected by the wiring members 12a and 12b is blown. FIG.
Then, the printed wiring fuses 11b and 11d are blown.

When recovery is performed after the cause of the blow of the printed wiring fuse is determined, the connection destinations of the wiring members 12a and 12b are changed to the printed wiring fuses 11c and 11e. FIG. 1 shows that the printed wiring fuse 11a is blown immediately. In FIG. 1, each of the vehicle control device 6 and the control device 7 can cope with a fuse operation up to three times.

FIG. 3 shows printed wiring fuses 11a-11.
d) Part of the power supply or ground inner layer 15 of the part d is extracted,
The inner layers 16a and 16b are provided to reduce the heat capacity of the printed wiring fuses 11a to 11d.

[0017]

According to the present invention, since an inexpensive fuse circuit having excellent vibration resistance can be realized, reliability can be improved by adopting it in a vehicle control device. Further, a plurality of fuse circuits can be installed in parallel, and a recovery operation at the time of fuse blowing can be performed by a simple operation of only switching connection of wiring members.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is a characteristic diagram of a copper pattern width of a printed wiring pattern and fusing.

FIG. 3 is an explanatory diagram of one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control device for vehicles, 2 ... Power supply, 3 ... Transistor for interface, 4 ... Control circuit, 5a-5b ... ic, 6-
7 ... Control device for vehicle, 8-9 ... Cable, 10 ... Printed wiring, 11a-11f ... Printed wiring fuse, 12
a to 12b: wiring members, 13 to 14: connectors.

Claims (4)

[Claims] 1. A vehicle control device for controlling a railway electric car, wherein a part of a printed wiring on a printed circuit on which electronic components are mounted is used as a fuse. 2. A vehicle control device according to claim 1, wherein the printed wiring fuse portion according to claim 1 is narrower by a certain length than any pattern width of the same pattern. 3. A printed wiring fuse according to claim 2, wherein a plurality of said printed wiring fuses are diverged from a printed wiring and installed, and one of the opposite sides of said printed wiring fuse and a printed wiring of a printed circuit are connected by a wiring material. Vehicle control device to be connected using. 4. A vehicle control device according to claim 1, wherein the power supply and ground layers in the multilayer printed circuit board are not provided near the printed wiring fuse.