阅读说明：本技术 电子控制装置 (Electronic control device ) 是由 荒木怜 川野佑 山口敦弘 于 2017-05-11 设计创作，主要内容包括：电子控制装置构成为包括：多个接地端子,该多个接地端子分别与装置内的多个接地对应地设置；接地公共部,该接地公共部连接与多个接地分别对应地设置的多个接地连接点；电流检测部,该电流检测部检测在多个接地连接点和分别与多个接地连接点对应的多个接地端子之间流过的电流、或者在接地公共部中流过的电流；及控制部,该控制部通过将电流检测部的检测结果与用于判定接地开路状态的判定值进行比较,来按每个接地检测接地开路状态。(The electronic control device is configured to include: a plurality of ground terminals provided corresponding to a plurality of grounds in the device, respectively; a ground common portion that connects a plurality of ground connection points provided corresponding to the plurality of grounds, respectively; a current detection unit that detects a current flowing between the plurality of ground connection points and a plurality of ground terminals corresponding to the plurality of ground connection points, respectively, or a current flowing in the ground common unit; and a control unit that compares the detection result of the current detection unit with a determination value for determining the open-ground state, thereby detecting the open-ground state for each ground.)

1. An electronic control device, comprising:

a plurality of ground terminals provided corresponding to a plurality of grounds in the device, respectively;

a ground common portion that connects a plurality of ground connection points provided corresponding to the plurality of grounds, respectively;

a current detection unit that detects a current flowing between the plurality of ground connection points and a plurality of ground terminals corresponding to the plurality of ground connection points, respectively, or a current flowing in the ground common unit; and

and a control unit that compares a detection result of the current detection unit with a determination value for determining a ground open state, thereby detecting the ground open state for each ground.

2. The electronic control device according to claim 1,

includes a plurality of circuit groups provided respectively in correspondence with the plurality of ground terminals,

the plurality of circuit groups each have:

a microcomputer; and

a driving unit connected to the ground connection point and driving the target device under the control of the microcomputer,

the control unit is constituted by the microcomputer of each of the plurality of circuit groups.

3. The electronic control device according to claim 1 or 2,

the current detection unit is configured by a plurality of current detectors provided corresponding to the plurality of ground terminals, respectively, and detecting currents flowing between the plurality of ground connection points and the plurality of ground terminals corresponding to the plurality of ground connection points, respectively.

4. The electronic control device according to claim 1 or 2,

the current detection unit is configured by one current detector provided in correspondence with any one of the plurality of ground terminals, and configured to detect any one of currents flowing between the plurality of ground connection points and the plurality of ground terminals corresponding to the plurality of ground connection points, respectively.

5. The electronic control device according to claim 1 or 2,

the current detection unit is configured by one current detector provided in the ground common unit and detecting a current flowing through the ground common unit.

6. The electronic control device according to any one of claims 3 to 5,

the current detector is a resistor.

7. The electronic control device according to claim 6,

the resistor is formed as part of a bus bar.

8. The electronic control device according to claim 7,

the resistor formed as part of the bus bar is U-shaped.

9. The electronic control device according to claim 6,

the resistor is a shunt resistor.

10. The electronic control device according to any one of claims 3 to 5,

the current detector is configured to detect a current from a magnetic field generated by the current.

11. The electronic control device according to any one of claims 1 to 10,

impedance between the plurality of ground connection points and the plurality of ground terminals corresponding to the plurality of ground connection points is made uniform.

12. The electronic control device according to claim 2,

the control unit learns the current value detected by the current detection unit when the target device is not operating or when the current flowing through the current detection unit is sufficiently small although the target device is operating, and changes the determination value based on the learned current value.

Technical Field

The present invention relates to an electronic control device having a structure capable of detecting a ground open state.

Background

Conventionally, there has been proposed a drive control unit that has two redundant drive control systems for driving motors and is connected to a motor having two winding groups (see, for example, patent document 1).

In the above drive control unit, the power supply from the battery is divided according to the drive control system. The drive control system includes a control circuit including a microcomputer (hereinafter referred to as a "microcomputer"). In each drive control system, the control circuits are connected to each other via a communication line, and are grounded separately from each other.

Here, in the above-described configuration having a plurality of systems of grounds, a technique of detecting an open ground state has been proposed (for example, see patent document 2). In the conventional technique described in patent document 2, a power supply system ground and a signal system ground are provided, and the grounds are separated from each other.

In the above configuration, the open-ground state is detected for each ground by the open-circuit detection unit including the comparator. Specifically, one input of the comparator is connected to ground, and a voltage as a reference is input to the other input. For example, when the ground line is disconnected, the ground becomes open, and the voltage of the ground input is pulled up to the internal power supply voltage by the pull-up resistor. As a result, the output signal voltage level of the comparator changes, and therefore, the open-ground state can be detected as a fault.

Disclosure of Invention

Technical problem to be solved by the invention

Here, in the conventional technique described in patent document 1, a plurality of grounds in the connection device are not connected and the grounds are not shared, and there is no mention of any case of detecting an open ground state. Further, when the conventional technique described in patent document 2 is applied to an electronic control device having a configuration in which the grounds are shared, even if the connection between the negative terminal and the ground terminal of the battery is broken, the voltage input to the ground of the comparator is maintained at about the ground level, and as a result, it becomes difficult to detect the ground open state.

In this way, in an electronic control device that employs a configuration in which a plurality of grounds in a device are connected and the grounds are shared, a technique for detecting an open-ground state is sought.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electronic control device capable of detecting an open ground state even when a configuration is adopted in which a plurality of grounds in a connection device are connected and the grounds are shared.

Technical scheme for solving technical problem

The electronic control device of the present invention includes: a plurality of ground terminals provided corresponding to a plurality of grounds in the device, respectively; a ground common portion that connects a plurality of ground connection points provided corresponding to the plurality of grounds, respectively; a current detection unit that detects a current flowing between the plurality of ground connection points and a plurality of ground terminals corresponding to the plurality of ground connection points, respectively, or a current flowing in the ground common unit; and a control unit that compares the detection result of the current detection unit with a determination value for determining the open-ground state, thereby detecting the open-ground state for each ground.

Effects of the invention

According to the present invention, it is possible to obtain an electronic control device capable of detecting an open ground state even when a configuration is adopted in which a plurality of grounds in a connection device are connected and the grounds are shared.

Drawings

Fig. 1 is a circuit diagram of an electronic control device in embodiment 1 of the present invention.

Fig. 2 is a perspective view of a bus bar in embodiment 1 of the present invention.

Fig. 3 is a bottom view of fig. 2.

Fig. 4 is a circuit diagram showing a state in the case where the ground terminal Tb-is open in the electronic control device of fig. 1.

Fig. 5 is a circuit diagram of an electronic control device in embodiment 3 of the present invention.

Fig. 6 is a circuit diagram showing a state in the case where the ground terminal Tb-is open in the electronic control device of fig. 5.

Fig. 7 is a circuit diagram of an electronic control device in embodiment 4 of the present invention.

Fig. 8 is a circuit diagram showing a state in the case where the ground terminal Tb-is open in the electronic control device of fig. 7.

Detailed Description

Hereinafter, an electronic control device according to the present invention will be described in accordance with a preferred embodiment with reference to the accompanying drawings. In the description of the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description is omitted. In addition, in each embodiment, a case where the present invention is applied to an electronic control device for a vehicle is exemplified.