JP2000052895A - Load controller for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out an operation as to a specific load even in case of breakage of a wire means electrically connecting a plurality of printed circuit boards in an integrated ECU mutually when a plurality of loads in a vehicle are controlled by means of the integrated ECU. SOLUTION: An integrated ECU 50 is constructed of a first and a second printed circuit boards 510, 520. In the first printed circuit board 510, switch signals inputted to an input circuit 511 and signals outputted from a microcomputer 522 in the second printed circuit board 520 via a wire means 530 are inputted to a load driving circuit 512 via OR-gates 513-515. Consequently, specific loads 61-63 (a headlight, a brake lamp, and a wiper, for example) can be controlled by means of either of these signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle load control device for controlling a plurality of loads on a vehicle.

[0002]

2. Description of the Related Art Conventionally, in this type of device, as shown in FIG. 3, a power supply voltage (indicated by a thick arrow) is supplied from a vehicle-mounted battery 10 to a distribution unit (junction box, junction box,
(Hereinafter referred to as J / B) 20 and supplied to a plurality of control units (hereinafter referred to as ECUs) 31 to 34. Also, various signals (indicated by dotted arrows) from sensors, switches, and the like are input to the plurality of ECUs 31 to 34 from the J / B 20 or individually, and
Controls a plurality of loads 41 to 47 such as motors and lamps based on these various signals.

FIG. 3 shows a plurality of ECUs 31.
There are problems that the wire harnesses are large and the assembling man-hours are increased because of the provision of .about.34 individually. Therefore,
As shown in FIG. 4, a proposal has been made to integrate a plurality of ECUs 31 to 33 into an integrated ECU 30. In this case, for example, as shown in FIG. 5, the integrated ECU 30 applies loads 41 to 4 to the first and second printed boards 310 and 320.
6, and the first and second printed boards 310 and 320 are electrically connected by wire means 330 such as sub-wires and flat wires.

In this case, for example, the first printed circuit board 3
10 is provided with an input circuit 311 for inputting signals from sensors, switches, and the like, and a load drive circuit 312 for driving loads 41 to 43.
Input circuit 32 for inputting signals from sensors, switches, etc.
1, a microcomputer 322 that performs processing for controlling the loads 41 to 46, and a load driving circuit 323 that drives the loads 44 to 46. The microcomputer 322 loads the load 4 based on the signal input to the input circuit 321 and the signal input from the input circuit 311 via the wire means 330.
Signals for controlling 1 to 46 are supplied to load driving circuits 312 and 323.
Output to In this case, a signal is output to the load drive circuit 312 via the wire means 330.

On the second printed circuit board 320, J
The power line from / B20 is directly connected, and power is supplied to the first printed circuit board 310 via the wire means 330. When a plurality of ECUs are integrated into an integrated ECU, the J / B 20 may be incorporated in the integrated ECU.

[0006]

The integrated ECU 30 is shown in FIG.
In such a case, if the wire means 330 is disconnected, there is a problem that a signal cannot be transmitted between the first and second printed boards 310 and 320, so that the load becomes inoperable. In this case, running may be hindered, particularly if the load is an important load such as a headlight or a brake lamp.

The present invention has been made in view of the above problems, and has as its object to enable operation with respect to a specific load even when a wire means is disconnected.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a first printed board (5) is provided.
In 10), an input circuit (511) for inputting a switch signal for operating a specific load (61 to 63) is provided, and is output from the second printed board (520) via wire means (530). A specific load (61 to 63) can be controlled by one of a signal and a switch signal input to the input circuit (511).

With this configuration, even if the wire means (530) is disconnected, the input circuit (511)
A specific load (61 to 63) can be operated by the switch signal from the CPU. Therefore, the specific load (61-
When 63) is an important load such as a headlight, a brake lamp, etc., even if the wire means (530) is disconnected, it can be operated to prevent a trouble in running.

According to the second aspect of the present invention, the power supply line is directly connected to the first printed board (510), and the first printed board (51) is connected via the wire means (530).
Since the power is supplied to the second printed board (520) from 0), the circuit of the first printed board (510) can be operated even if the wire means (530) is disconnected.

The above-mentioned reference numerals in parentheses indicate the correspondence with specific means described in the embodiment described later.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 shows a configuration of a vehicle load control device according to an embodiment of the present invention. In the integrated ECU 50 shown in FIG. 1, the first and second printed boards 51
Circuits for controlling the loads 61 to 66 are divided into 0 and 520, and the first and second printed boards 510 and 520 are electrically connected (signal connected) by wire means 530 such as sub-wires and flat wires. . In this embodiment, the loads 61, 62, and 63 are important loads necessary for safe running such as headlights, stop lamps, and wipers.

The first printed circuit board 510 includes a sensor,
Input circuit 51 for inputting signals from switches (including switches such as headlights, stop lamps, wipers, etc.)
1 and a load drive circuit 512 for driving the loads 61 to 63
And OR gates 513 to 515 which take OR logic of a switch signal (switch signal of a headlight, a stop lamp, a wiper, etc.) from the input circuit 511 and a signal from the microcomputer 522 via the wire means 530.

An input circuit 521 for inputting signals from sensors, switches, and the like is provided on the second printed circuit board 520.
And a microcomputer 522 as control means for performing processing for controlling the loads 61 to 66, and a load driving circuit 523 for driving the loads 64 to 66. Microcomputer 52
2 outputs a signal for controlling the loads 61 to 66 based on the signal input to the input circuit 521 and the signal input from the input circuit 511 via the wire means 530 to the load driving circuits 512 and 523. In this case, the load driving circuit 5
A signal is output to 12 via a wire means 530.

The first printed circuit board 510 has J
/ B20 (see FIG. 4) is directly connected to the second printed circuit board 52 via wire means 530.
0 is supplied with power. According to the above configuration, even if the wire means 530 is disconnected, the important loads 61 to 63 can be operated by the switch signal from the input circuit 511 through the OR gates 513 to 515.

For example, when the load 61 is a headlight,
A signal for turning on the headlights when the light switch is turned on or when the outside of the vehicle is dark is output from the microcomputer 522 according to a signal from the light switch and a signal from the optical sensor for detecting the brightness of the outside of the vehicle.
Is input to the load driving circuit 512 through the OR gate 513 to turn on the headlights. However, if the signal from the light switch can be input to the load driving circuit 512 via the OR gate 513, even if the wire means 530 is disconnected, the head Lights can be turned on.

When the load 62 is a brake lamp,
The microcomputer 522 outputs a signal to turn on the brake lamp when the brake switch is turned on or when the exhaust brake is applied, based on a signal from the brake switch and a signal from the exhaust pressure sensor that detects the exhaust pressure. The signal is output via the OR gate 514 to the load driving circuit. The brake lamp is turned on by being input to 512, but if the signal from the brake switch can be input to the load drive circuit 512 via the OR gate 514, the brake lamp can be turned on even if the wire means 530 is disconnected. Can be.

Further, when the load 63 is a wiper, the microcomputer 522 sets the wiper to high, low, or low in response to a high, low, or intermittent (INT) switch signal from the wiper switch.
A signal for operating intermittently is output. If the signal is high, the signal is directly input to the load driving circuit 512. If the signal is low or intermittent, the signal is input to the load driving circuit 512 via the OR gate 515. The wiper is operated by each signal, but if a low switch signal can be input from the wiper switch to the load drive circuit 512 via the OR gate 515, the wiper can be operated low even if the wire means 530 is disconnected. Can be done.

The first printed circuit board 510 has a J / B
By directly connecting the power line from 20,
Even if the wire means 530 is disconnected, the first printed circuit board 51
0 circuits can be activated. FIG. 2 shows an assembly configuration of the integrated ECU 50 described above. The first printed board 510 is electrically connected to an external signal line by a connector 516. In the figure, OR gates 513 to 513 are shown.
515 and circuit elements constituting the load drive circuit 512 are illustrated, and the input circuit 511, wiring, and the like are omitted. Also, the second printed board 520 is a connector 5
24 is electrically connected to an external signal line. In this second printed board 520, only the microcomputer 522 is shown, and other input circuits 521, load drive circuits 523, wiring, and the like are omitted. In addition, the wire means 530 includes first and second printed boards 510, 520.
A first wire means 531 for transmitting signals between;
It comprises a second wire means 532 for supplying power.

The first and second printed boards 510, 5
Reference numeral 20 denotes an upper case 541 and a lower case 5 constituting a case.
42. In the embodiment described above,
Although the configuration in which the circuit means is divided into two printed boards is shown, the configuration may be divided into more printed boards.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a vehicle load control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an assembly configuration of an integrated ECU shown in FIG. 1;

FIG. 3 is a diagram showing a configuration of a conventional vehicle load control device.

4 is a diagram showing a case where a plurality of ECUs are integrated into the configuration shown in FIG. 3 to form an integrated ECU.

FIG. 5 is a diagram showing a configuration of an integrated ECU shown in FIG.

[Explanation of symbols]

10: On-board battery, 20: J / B, 50: Integrated EC
U, 510: first printed board, 520: second printed board, 61 to 66: load.

Claims (2)

[Claims] 1. Circuit means (510, 520) for controlling a plurality of loads (61-66) of a vehicle based on an input signal.
A load control device for a vehicle, comprising: a circuit (510, 520);
542) is divided into at least first and second printed boards (510, 520) housed in the first and second printed boards.
The second printed board (510, 520) is connected to the wire means (5).
30), the first printed board (510) is an input for inputting a switch signal for operating a specific load (61-63) of the plurality of loads (61-66). Circuit (51
1), wherein the specific signal is output by one of a signal output from the second printed board (520) via the wire means (530) and a switch signal input to the input circuit (511). A load control device for a vehicle, wherein the load control device is configured to control loads (61 to 63). 2. A power line is directly connected to the first printed board (510), and the first printed board (510) is connected to the second printed board (520) via the wire means (530). The load control device for a vehicle according to claim 1, wherein power is supplied to the vehicle.