JP2002278763A - Electric apparatus controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an increase in cost for mounting resistance instead of a switch by using the existing wiring. SOLUTION: This controller comprising a microcomputer 2 including a plurality of machine model programs and an operating part B having a plurality of switches, an unneeded switch due to the difference of a machine model is replaced with dummy resistance 14 among the switches on the operating part, this resistance value is inputted to the analog input ports 7 of the microcomputer, the machine model is decided by the value, and a use program for the microcomputer 2 is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric control device suitable for electric equipment having a plurality of models having similar functions.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 9-134279, a plurality of resistors for model selection are provided outside a main board, these are connected to Hi level and Lo level, respectively, and model selection is performed by a combination thereof. Is going.

[0003]

In the conventional model determination based on Hi / Lo determination based on the presence / absence of a resistor, an increase in cost is unavoidable because redundant resistors and wires, which are originally unnecessary, are provided redundantly. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to eliminate an increase in cost since a wiring is used originally and a resistor is mounted instead of a switch.

[0004]

According to a first aspect of the present invention, a control program for a plurality of models is provided.
A microcomputer having at least one or more analog input ports, a plurality of switches, and a dummy resistor having a resistance greater than an on-resistance of a switch mounted in place of a switch that is missing depending on the model among the plurality of switches; Before the microcomputer reads the input of the switch, the electric control device composed of the pull-down resistor connected to GND between the switch or the dummy resistor and the wiring connecting the microcomputer,
The voltage input there is read by the analog port. If the voltage is close to the power supply voltage or the voltage of GND, it is recognized that the switch is on. If the voltage is neither of them, the unnecessary switch is missing and the dummy resistor is It recognizes that it is attached, specifies the model by its combination, and then selects and operates a program for controlling the device according to the specified model.

According to a second aspect of the present invention, there is provided an electric control device according to the first aspect, wherein the plurality of switches have three or more switches, of which at least two switches are replaced with dummy resistors. Thus, more models can be controlled by one main board.

According to a third aspect of the present invention, there is provided an electric control apparatus according to the first aspect, wherein the switch has an analog input port and a digital input port which are electrically connected in parallel, and the model determination is terminated. After that, the normal digital input port can be used, so that the switch input program can be simplified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the present invention easier to understand, the present invention will be described in detail with reference to the following embodiments.

[0008]

FIG. 1 is a schematic diagram of the present invention. The microcomputer 2 is connected to switches (9 to 12). The switch (9 to 12) and the wiring of the microcomputer 2 are connected to GND by a pull-down resistor 5, so that the switch (9 to 12)
If １２12) is OFF, the switch input port 6 of the microcomputer 2 is Lo. Also, switches (9 to 12)
If any one of them is ON, the corresponding switch input port 6 becomes Hi. The operation unit is of a different model from the operation unit A, and the switches 9 and 10 of the operation unit 8 are unnecessary switches due to model differences and are replaced with dummy resistors 14. This dummy resistor 14 has a resistance value that is impossible even when the switch 9 and the switch 10 are ON or OFF, and is read separately from the operation unit A by reading the voltage input to the analog input port 7 of the microcomputer 2. The microcomputer 2 recognizes that the operation unit B of the model is attached. For example, in the operation unit 8, the switch 9 is “wash”, the switch 10 is “warm air”, the switch 11 is “timer”,
It is assumed that the switch 12 is defined as “driving”. On the other hand, in the operation unit B, when the switch 11 and the switch 15 are switches that have different meanings even if they are in the same position, such as the switch 15 is “washing” and the switch 16 is “running,” If the switch is determined by different control programs and the switches are input, the switches are correctly recognized.

Further, the fact that there are two switches to be replaced with the dummy resistor 14 means that there are four combinations as shown in FIG. 2, which means that a maximum of four models can be covered by one controller. Become.

FIG. 3 shows the concept of determining the voltage setting of the analog input port 7 of the microcomputer 2 by the dummy resistor 14. Since the input of the switch (9 or 10) to be replaced with the dummy resistor 14 is performed at the switch input port 6, which is a normal input port, it is necessary to set the dummy resistor 14 so that this port is not recognized as at least Hi. The microcomputer has a certain range for the voltage recognized as Hi or Lo. However, even if a resistance value recognized as Lo is selected, the voltage that is recognized as Hi when the switch is present and turned on when the switch is present is turned on. No problem. Note that an area that is neither Hi nor Lo recognized may be recognized as Hi due to variations in microcomputers, so that the range actually recognized as Lo is the target voltage. It is safe to do. For example, as shown in FIG. 4, the power supply voltage (Vcc) is 5 volts, the dummy resistor 17 is 100 kΩ,
When the pull-down resistor 18 is set to 10 kΩ, the voltage inputted to the analog input port and the switch input port becomes about 0.45 volts from the divided voltage, the switch input port 6 is recognized as Lo, and the analog input port 7 is switched to the switch. Since (9 or 10) is larger than 0 volt which is the voltage at the time of OFF, it is recognized as a dummy resistor.

[0011]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, since unnecessary switches are replaced with dummy resistors, there is no need to design redundantly such as wiring and board area, so that a plurality of models of control devices can be shared without increasing costs, and management in manufacturing and sales is simplified. Be transformed into

According to the second aspect of the present invention, the number of switches that can be shared can be increased by increasing the number of switches replaced with dummy resistors. The number of switches to be replaced is n
If the number is limited to 2, the maximum number of models that can be shared is 2 to the nth power.

According to the third aspect, generally, in a microcomputer program, analog input is more complicated than normal input, but once a model is determined by analog input, a normal input port can be used. It simplifies and eventually increases the speed of the program, leaving room for other processing.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram of the present invention.

FIG. 2 is an example of a table showing models classified by switches and dummy resistors according to the present invention.

FIG. 3 is a schematic diagram showing a concept of setting a dummy resistor according to the present invention.

FIG. 4 is a circuit diagram showing a method for obtaining a dummy resistor according to the present invention.

[Explanation of symbols]

2 microcomputer, 5 pull-down resistor, 6 switch input port, 7 analog input port, 9-12 switch, 14 dummy resistor, 15-16 switch, 17
Dummy resistance (100 kΩ), 18 ... pull-down resistance (1
0kΩ)

Claims (3)

[Claims] 1. A microcomputer having control programs of a plurality of models and having at least one or more analog input ports, a plurality of switches, and a plurality of switches mounted in place of switches which are missing depending on the model. In an electric control device including a pull-down resistor connected to GND between a dummy resistor having a resistance value larger than the on-resistance value of the switch and a wire connecting the switch or the dummy resistor and the microcomputer, the dummy resistor or the switch and the pull-down resistor are used. An electric control device wherein a microcomputer reads a voltage to be divided by an analog port, determines a model from the voltage, and selects a corresponding control program. 2. The electric control device according to claim 1, wherein the plurality of switches have three or more switches, and two or more switches are replaced with dummy resistors. 3. The electric control device according to claim 1, wherein the switch has an analog input port and a digital input port electrically connected in parallel.