JP2003166802A - Circuit device with terminal discriminating mountable vehicle type and mounting method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate a multiplicity of circuit devices even after housed in a casing by a simple composition in regard to discrimination of the circuit devices with a different internal functions in accordance with mountable vehicle types. <P>SOLUTION: A resistive element group 13 is composed of four serially connected resistance groups R, 2R, 4R and 8R, and the mountable vehicle type discriminating terminal 9 is connected to both ends of the resistive element group 13. Mounting pads 15 are provided on both ends of each resistance, and short circuit elements 17 are arranged between the mounting pads 15 so as to short-circuit them in accordance with a vehicle type to which the circuit device is mounted. When the circuit device is operated, a predetermined constant current i is supplied to the resistive element group 13 from a constant current source 19, voltage is generated between both ends of the restive element group 13, the voltage is read by a voltage detecting analog-to-digital converter 21, and the vehicle type is discriminated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit device with a mounted vehicle type identification terminal and a mounting method for a circuit device with a mounted vehicle type identification terminal.

[0002]

2. Description of the Related Art In a vehicle control circuit device, a plurality of circuit devices are manufactured with a common circuit board and different vehicle models. For this reason, different types of electronic components that define internal functions are mounted on a common circuit board according to the type of vehicle to be mounted, and the components are stored in a housing for mounting on the vehicle. In housing in a case, waterproofness, safety against high voltage and large current, noise resistance, etc. are considered. After the mounted circuit board is housed in the housing, software is written in the built-in CPU according to the type of vehicle to be mounted, and the circuit device is inspected.

In such a case, it is necessary to determine the type of the mounted circuit board housed in the housing. Conventionally, various methods have been proposed for discriminating printed circuit boards having different internal specifications. For example, in addition to the method of optically identifying the markings such as markings and barcodes on the board, part of the circuit is opened by laser trimming or electrically shorted by a short-circuit element or wire bonding. It is known how to do it. Also,
Japanese Unexamined Patent Publication No. 5-259696 discloses a known example in which the resistance value of two resistors is changed according to the type of the board to determine the board.
An invention is disclosed in which a jumper is arranged on the discard plate portion, data on whether the jumper is present or not is written in a storage element of the substrate main portion, and then the discard plate portion is separated.

[0004]

As described above, by using the conventional technique, it is possible to determine the type of the printed circuit board having different internal specifications. However, these conventional techniques, like marking, perform discrimination after the type of the target printed circuit board is known,
It was necessary to prepare a large number of resistors having different resistance values depending on the type of substrate, or a complicated structure requiring a discarding plate portion and a memory element. In such a conventional technique, it is not possible to perform posterior determination by marking or the like for a vehicle circuit device in which the substrate is covered with the housing after mounting. Further, in order to be able to discriminate a large number of vehicle types, a large number of resistance elements were required, or a complicated structure such as a discard plate portion and a memory element was required.

An object of the present invention is to solve the problems of the prior art, and to determine a circuit device having different internal functions depending on the type of vehicle to be mounted, with a simple structure, even after being housed in a housing, a large number of (EN) Provided are a circuit device with a mounted vehicle type discrimination terminal and a method of mounting a circuit device with a mounted vehicle type discrimination terminal, which can discriminate a circuit device.

[0006]

In order to achieve the above object, a circuit device with a vehicle type discrimination terminal according to the present invention has a different internal function for each vehicle type to be mounted, and discriminates the vehicle type to be mounted to discriminate the vehicle type to be mounted. A circuit device with a mounted vehicle type determination terminal including a terminal, wherein an electronic component that defines an internal function and a mounted circuit board on which a plurality of mounted vehicle type determination impedance elements that are connected in series are mounted, and the plurality of connected circuit boards are connected. It is characterized in that it is provided with a vehicle type identification terminal provided at both ends of the impedance element and a short-circuit element for short-circuiting each impedance element according to the vehicle type to be mounted.

Further, in the circuit device with a vehicle type identification terminal according to the present invention, the plurality of connected impedance elements are N resistance elements connected in series, and each resistance value is
The minimum resistance value is R, and R, 2R, and 4R have a large value that is doubled in order, and the maximum resistance value has a resistance value that is (N-1) times the minimum resistance value. Is preferred.

Further, according to the method of mounting the circuit device with the mounted vehicle type discriminating terminal according to the present invention, the internal function differs depending on the mounted vehicle type, and the mounted vehicle type discriminating terminal is provided with the mounted vehicle type discriminating terminal. A mounting method for a circuit device, which provides an electronic component for defining an internal function, an impedance element arranged between the mounted vehicle type identification terminals, and a short circuit element for short-circuiting the impedance element. A board providing step, placing the electronic component at a predetermined position, connecting a plurality of the impedance elements in series, and arranging the short-circuit element at different mounting positions according to the vehicle type to be mounted; A mounting program providing step for providing a mounting program specific to each electronic component and the impedance element according to the specific mounting program described above. Characterized in that it comprises a mounting step of mounting the short-circuit element.

In the circuit device with the mounted vehicle type discrimination terminal according to the present invention, a plurality of mounted vehicle type discrimination impedance elements connected in series are provided between the mounted vehicle type discrimination terminals, and each impedance element is provided by a short-circuit element according to the mounted vehicle type. Short circuit. When a constant current is passed through the mounted vehicle type discrimination impedance element group connected in series and the output between the mounted vehicle type discrimination terminals is observed, the output differs due to the position of the short-circuit element depending on the mounted vehicle type. Therefore, with regard to the discrimination of the circuit device having different internal functions depending on the type of vehicle to be mounted, it is possible to discriminate a large number of circuit devices with a simple configuration even after they are housed in the housing.

The plurality of connected impedance elements have a minimum resistance value of R and have a large value of R, 2R, and 4R, which are doubled in order, and the maximum resistance value is 2 with respect to the minimum resistance value. N resistance elements having a resistance value of (N-1) times the value of are connected in series and used. For example, R, 2R, 4
When four resistors R, 8R are connected in series, 16 different outputs from 0 to R, 2R, 3R, 4R or less 15R can be obtained at the mounted vehicle type identification terminal depending on the mounting combination of the short-circuit terminals. , 16 models can be identified. Furthermore, the resistance value is 1
When adding 5R resistance and connecting 5 resistances in series, 32 vehicle types can be identified. Therefore, with regard to the determination of the circuit device having different internal functions depending on the type of vehicle to be mounted, it is possible to determine a large number of circuit devices with a simple configuration even after they are housed in the housing.

Further, according to the present invention, there is provided a method of mounting a circuit device with a mounted vehicle type discrimination terminal, wherein an electronic component defining an internal function, an impedance element arranged between the mounted vehicle type discrimination terminals, and a short circuit for short-circuiting the impedance element. In a mounting program providing process for mounting the elements and devices, a mounting program specific to each vehicle type to be mounted is provided. Therefore, the electronic component, the impedance element, and the short-circuit element are simultaneously mounted in the same mounting process by the specific mounting program. As a result, it is possible to distinguish a large number of circuit devices even after they are housed in the housing with a simple configuration for distinguishing the circuit devices having different internal functions depending on the type of vehicle to be mounted.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view of a circuit device 1 equipped with a vehicle type identification terminal, in which a mounting circuit board 3 is a housing 5
3 is a view showing the mounting state of the mounting circuit board 3 by breaking a part of the housing 5 for the convenience of description. On-board vehicle type identification circuit device 1
The input / output connector 7 having a power supply terminal, a ground terminal, and a circuit input / output terminal and a mounted vehicle type identification terminal 9 are provided outside the housing 5. Input / output connector 7 for power supply terminal and connection terminal
The input / output connector 7 may be provided with the mounted vehicle type identification terminal 9.

The mounting circuit board 3 is mounted with an electronic component 11 which defines an internal function according to the type of vehicle to be mounted, and a resistance element group 13 for discriminating the type of mounted vehicle. The electronic component 11 can include a control CPU. When the minimum resistance value is R,
R, 2R, 4R, and 8R are connected in series, and a mounting pad 15 for mounting a short-circuit element is provided at each connection portion. A short-circuit element is mounted between the mounting pads 15 according to the type of vehicle on which the circuit device 1 is mounted. Electronic component 11,
The resistive element group 13 and the short-circuit element are mounted by the same mounting program, and the mounted circuit board 3 on which these are mounted is mounted on the housing 5.
Is stored in.

FIG. 2 is a diagram showing the relationship between the mounted vehicle type identification terminal 9, the resistance element group 13, and the mounting pad 15 for mounting the short-circuit element. In the resistance element group 13, R, 2R, 4R, and 8R are It is composed of four resistance groups connected in series, and the mounted vehicle type identification terminals 9 are connected to both ends of the resistance element group 13. The mounting pads 15 are provided on both ends of each resistor, and the short-circuit elements are arranged so as to short-circuit the mounting pads 15 according to the vehicle type on which the circuit device 1 is mounted. For example, in FIG. 2, the short-circuit element 17 is arranged so as to short-circuit the 4R resistance. Further, one end of the resistance element group 13 is connected to the constant current source 19, and the other end is grounded.

In this configuration, in order to determine the vehicle type,
A device that detects a voltage is connected to both ends of the mounted vehicle type identification terminal 9. It is preferable to connect an analog-digital converter 21 capable of detecting the voltage as a digital value. next,
Power and signals are supplied from the input / output connector 7 of the circuit device 1 to operate the circuit device 1. Then, a constant current i is supplied from the constant current source 19 to the resistance element group 13, and a voltage is generated across the resistance element group 13. Now, when the 4R resistor is short-circuited, the resistance element group 13 has a resistance value of 11R as a whole, so that the generated voltage is 11iR (V). The analog-to-digital converter 21 using iR as a unit
If the voltage is displayed at, "11" is displayed and output.
This "11" can be used as a vehicle type display.

That is, by disposing the short-circuit element 17, the resistance value measured at both ends of the resistance element group 13 is 0,
Since it is possible to change 16 steps from R, 2R, 3R to 15R at intervals of R, the output of the analog-to-digital converter 21 allows the mounting circuit board housed in the housing to be 16 kinds according to the model to be mounted. Can be determined. When connecting five resistance element groups 13 in series, a resistance of 16R is further connected. At this time, 32 types can be discriminated. Generally, in the resistance element group 13, when N resistance elements are connected in series, each resistance value is set to R as the minimum resistance value.
R, 2R, and 4R are sequentially increased by two, and the maximum resistance value has a resistance value that is (N-1) times the minimum resistance value. The circuit device can be identified.

FIG. 3 is a flow chart of a method of mounting the circuit device with the mounted vehicle type identification terminal. S1 is a mounting board providing step, which provides a mounting board on which an electronic component that defines an internal function, a resistance element that is arranged between the mounted vehicle type determination terminals, and a short-circuit element that short-circuits the resistance element are mounted. The mounting substrate is a substrate on which a pattern for mounting components is formed, and refers to an unmounted substrate on which components are not yet mounted.
The mounting board may include a glass epoxy board and a ceramic board. The electronic components that define internal functions can include a microprocessor element such as a control CPU, an input / output connector, and a vehicle type identification terminal.

Step S3 is a mounting program providing step, in which electronic parts, resistance elements, and short-circuit elements, which are determined by the type of vehicle to be mounted, are arranged, and a mounting program specific to each type of vehicle to be mounted is provided.

In step S5, a mounting process is performed to mount the electronic component, the resistance element, and the short-circuit element according to the specific mounting program. When the mounting process is completed, the mounted circuit board on which the components are mounted is completed.

FIG. 4 shows the mounting circuit board obtained in FIG.
It is a flowchart of the manufacturing method of the circuit device with a mounted vehicle type identification terminal which writes and inspects software for each mounted vehicle type.

Step S7 is a mounting circuit board providing step, which is a step of providing the mounting circuit board obtained according to the flowchart of FIG.

Step S9 is a step of mounting the mounting circuit board in the housing by using mounting holes provided in the mounting circuit board in advance, and fixing the mounting circuit board. The input / output connector and the mounted vehicle type identification terminal are arranged outside the housing. Depending on the type of vehicle to be mounted, the casing may be waterproof, safety against high voltage and large current, noise resistant, or the like.

In step S11, which is a mounting vehicle type discrimination step, a voltage detecting device such as an analog-digital converter is connected to the mounting vehicle type discrimination terminal, and a power source and a signal are supplied from the input / output connector to operate the circuit device to perform analog processing. The type of vehicle to be installed is determined from the output display of voltage detection equipment such as a digital converter. For example, in the example of FIG. 2, it is determined that the vehicle type “11” is mounted.

Step S13 is a step of writing the control software for the installed vehicle type, which has been discriminated in the software writing step, into the control CPU incorporated in the mounted circuit board via the input / output connector.

Step S15 is a step of inspecting the operation of the mounted circuit board on which the software is loaded by using the inspection software according to the determined vehicle type to be mounted, by exchanging signals through the input / output connector. Is. By passing this inspection, it is completed as a circuit device that meets the specifications compatible with the type of vehicle to be installed.

In the above, as the element group for discriminating the type of vehicle to be mounted, the series-connected resistance element group has been described, but in addition, for example, a series-connected capacitor group or inductor group of impedance element groups are used and connected in series. It is possible to determine the type of vehicle installed by measuring the impedance at both ends. In this case, constant current sources at both ends of the impedance group,
Grounding can be omitted.

[0027]

EFFECTS OF THE INVENTION With the circuit device with the mounted vehicle type discrimination terminal and the method for mounting the circuit device with the mounted vehicle type discrimination terminal according to the present invention, it is possible to determine a circuit device having different internal functions for each vehicle type with a simple configuration. Even after being housed in the housing, a large number of circuit devices can be identified.

[Brief description of drawings]

FIG. 1 is a plan view of a circuit device with a mounted vehicle type identification terminal according to an embodiment of the present invention, in which a part of a housing is cut away.

FIG. 2 is a diagram showing a relationship between a mounted vehicle type identification terminal, a resistance element group, and a mounting pad for mounting a short-circuit element in the circuit device according to the embodiment of the present invention.

FIG. 3 is a flowchart of a method for mounting a circuit device with a mounted vehicle type identification terminal according to an embodiment of the present invention.

FIG. 4 is a flowchart of a method of manufacturing a circuit device with a vehicle-mounted type identification terminal according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 (with mounted vehicle type discrimination terminal) circuit device, 3 mounting circuit board, 5 housing, 7 input / output connector, 9 mounted vehicle type discrimination terminal, 11 electronic parts, 13 resistive element group, 15 mounting pad, 17 short circuit element, 19 Constant current source, 21 analog-digital converter.

Claims (3)

[Claims] 1. A circuit device with an on-board vehicle type identification terminal, which has an on-board vehicle type identification terminal for identifying an on-board vehicle type, the internal function of which differs depending on the on-board vehicle type, the electronic device defining an internal function being connected in series. A mounting circuit board on which a plurality of mounted vehicle type identification impedance elements are mounted, mounted vehicle type identification terminals provided at both ends of the plurality of connected impedance elements, and each impedance element is short-circuited according to the type of vehicle to be mounted. A circuit device with a vehicle type identification terminal mounted thereon, comprising: 2. The circuit device with the mounted vehicle type identification terminal according to claim 1, wherein the plurality of connected impedance elements are N resistance elements connected in series, and each resistance value has a minimum resistance value of R. , R, 2R, 4R, and the like, each of which has a larger value in the order of 2, and the maximum resistance value has a resistance value of (N-1) times the minimum resistance value. Circuit device with discrimination terminal. 3. A method of mounting a circuit device with an on-board type discriminating terminal, which has different internal functions depending on the on-board type, and which has an on-board type discriminating terminal for discriminating the type of vehicle to be mounted. A mounting board providing step of providing a mounting board for mounting an impedance element arranged between the mounted vehicle type discrimination terminals, and a short-circuit element for short-circuiting the impedance element, and arranging the electronic component at a predetermined position, A mounting program providing step of providing a mounting program specific to each mounted vehicle model, in which a plurality of the impedance elements are connected in series and arranged, and the short-circuit elements are arranged at different mounting positions according to the vehicle model mounted, A mounting step of mounting the electronic component, the impedance element, and the short-circuit element according to a specific mounting program. How to mount a circuit device with a vehicle type identification terminal.