JPH04165501A - Manipulated variable detector - Google Patents

Abstract

PURPOSE:To reduce assembly adjustment manhour by setting the voltage value of a volume at the time of detection of a reference position as the voltage value of a reference position and setting the relation of a manipulated variable and the voltage value of the volume, based thereon as a reference, and deciding the manipulated variable from the voltage value of the subsequent volume. CONSTITUTION:Based on a neutral detecting signal from a neutral detection switch 2 as a reference, it is decided that an accelerator mechanism is in a neutral position. The voltage value of an accelerator volume 2 in this case is converted to a digital value by an analog/digital converter 3, and read in a microcomputer device 4. Subsequently, in its setting, means, a voltage value corresponding to the neutral position is determined, and moreover, based on this voltage value as a reference, the ranges of an advance, a retreat ad a play are set by a calculation. In such a manner, a manipulated variable can be detected without being affected by the characteristic variance of a volume and the variance of an operating mechanism, etc., and the assembly adjustment manhour can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operation detecting device suitable for controlling the direction, speed, etc. of an electric wheelchair or the like.

[Prior art J] Conventionally, in battery-powered electric wheelchairs, etc., forward and backward direction control and speed control are performed by controlling the driver's accelerator mechanism operation m as a digital value by a microcomputer as an accelerator volume voltage value. It was done manually.

In other words, the accelerator mechanism has a neutral position as a reference position that instructs to stop, and when the accelerator mechanism is shifted to one side from that position, it instructs forward control and controls the speed with the amount of operation (amount of change). instruct the microcomputer,
Also, in the above, if it is displaced to the other side,
It instructs the backward control and uses the amount of operation (displacement amount) to instruct the speed to the microcomputer. At this time, the microcomputer determines the neutral position using a predetermined voltage value of the accelerator volume and controls the forward or backward direction, and also detects the operation amount based on the voltage value and controls the speed. was.

[Problem to be solved by the invention] However, in the above-mentioned conventional technology for controlling the direction and speed of electric wheelchairs, etc., due to variations in the characteristics of the accelerator volume, variations in the accelerator mechanism, etc., the voltage value at the neutral position If this happens, it will be difficult for the microcomputer to accurately detect the neutral position, and it will be difficult to perform control in accordance with the driver's operations.

Therefore, in the past, a semi-fixed volume, etc. was added to the accelerator volume separately from the accelerator volume, and by adjusting it, variations in the characteristics of the accelerator volume and variations in the accelerator mechanism were adjusted, which resulted in an increase in assembly and adjustment man-hours. was.

The present invention was devised to solve the above-mentioned problems, and when the amount of operation when an operator operates an operating mechanism is detected using a volume, the influence of variations in the characteristics of the volume, variations in the operating mechanism, etc. It is an object of the present invention to provide a manipulated variable detection device that can detect the manipulated variable without being detected and can reduce assembly and adjustment man-hours.

[Means for Solving the Problems] The configuration of the operation amount detection device of the present invention for achieving the above object is as follows: The operation amount detection device detects the operation from the reference position of the operation mechanism by the voltage value change of the volume. , a means for detecting the reference reference O1j in conjunction with the volume, and a relationship between the manipulated variable and the voltage value of the volume is set based on the voltage value of the volume when the detecting means detects the reference position. and means for determining the change in the voltage value of the iM polyneme based on the relationship and detecting the manipulated variable.

[Function] The present invention detects the reference position of the operating mechanism by means other than the polycomb for detecting the amount of operation of the operating mechanism, and converts the voltage value of the volume at the time of detection of the reference position to the voltage at the reference position. By determining the value as a value, further setting the relationship between the manipulated variable and the voltage value of the poly 2-me based on the voltage value at the reference position, and determining the manipulated variable from the voltage value of the volume at the subsequent manipulated variable. , It is possible to automatically adjust variations in the operating mechanism and variations in volume characteristics, and the number of man-hours for adjustment is reduced, thereby reducing the number of man-hours for assembly and adjustment.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In this embodiment, the accelerator mechanism of an electric wheelchair is used as an example of the operation mechanism, and progress is made regarding the movement of the electric wheelchair.

An example of an operation amount detection device that detects and inputs the operation amount of an accelerator mechanism to a control drive mechanism that performs reverse direction control and speed control will be described.

In the configuration of this embodiment, l is an accelerator volume that is linked to the accelerator mechanism, 2 is a neutral detection switch that is linked to the accelerator volume, and 3 is an A/D (analog-digital) that converts the voltage value of the accelerator volume 1 into a digital value. Converter, 4 is a microcomputer device,
5 is a motor drive circuit, and 6 is a motor for driving.

One end of the resistor end of the accelerator polycomb 1 is connected to a circuit power supply (for example, 4-5 V) through a fixed resistor R1, the other end of the resistor end is connected to the ground through a fixed resistor R2, and the sliding end of the accelerator volume 1 is connected to the circuit power supply (4-5 V, for example) through a fixed resistor R1. Δ/I) Connection 4 to human power of converter 3. The conversion output of the Δ/D converter 3 and the neutral detection signal of the neutral detection switch 2 are connected to the input port of the microcomputer device 4. Further, the terminal of the motor reproducing circuit 5 is connected to the output port of the microphone Cl computer device 4, and the motor 6 is connected to the motor drive circuit 5 by the output terminal of the microcomputer device 4.
is driven by the output of

The microcomputer device 4 serves as both a motor control device and an operation amount detection device that detects and inputs the operation amount of the accelerator mechanism to the motor control device. This operation amount detection device receives the neutral detection signal from the neutral detection switch 2 during initialization processing such as when the power is turned on, reads the voltage value of the accelerator volume 1 at that time, and calculates this as the voltage at the neutral position. a setting means for determining the voltage value and setting the relationship between the voltage value of the accelerator volume l and the operation amount of the accelerator mechanism based on this voltage value; a memory for storing the setting contents of the relationship; It is comprised of a manipulated variable determination means that inputs a voltage value, determines the relationship between the stored voltage value and the manipulated variable, detects the manipulated variable, and inputs the detected manipulated variable to a portion serving as a motor control device.

The operation and effect of the embodiment configured as above will be described.

In this embodiment, it is determined that the accelerator mechanism is in the neutral position based on the neutral detection signal from the neutral detection switch 2, and the accelerator volume at this time is
The analog-to-digital converter 3 converts the voltage value into a digital value, reads it into the microcomputer device 4, and the setting means determines the voltage value corresponding to the neutral position, and furthermore, moves forward based on this voltage value. .

Set the range of retreat and play by calculation.

For example, an example of the setting is shown in FIG. In this example configuration,
A circuit power supply voltage of 5V is applied to both ends of the accelerator volume l through the resistor R3°R, and the resistors R8 and Rt are 0.
Make sure that a voltage drop of about 1 V occurs. Here, when the power is turned on, a neutral detection signal is obtained from the neutral detection switch 2, and a play is calculated from this position to a preset width (±0.2V in this setting example). Furthermore, move forward and backward between 0 and 5V.

And at each maximum speed, play is calculated. An example of this setting is 0 to 0. IV and 4.9~
5. Ov is the voltage value that appears when a wire is disconnected or shorted, and based on that value, if the preset play width is 0.2V, 4°7V is the maximum backward speed, 4.
The range of play is set to 7-4.9V, the maximum forward speed is 0.3V, and the range of play is 0.1V-0.3.

These setting values are stored in memory.

Next, during driving operation, the voltage value obtained from the accelerator volume l is converted into a digital value by the analog-to-digital converter 3 and input to the microcomputer device 4. The operation amount detection means of the microcomputer device 4 is
The operation m is determined by comparing the current state with the value set by the above calculation and determining the current state. In the setting example shown in Figure 2, 27
The range of ~47V instructs reversing, and the absolute value obtained by subtracting the upper limit of play from the neutral position, 2.7V, from that voltage value becomes the manipulated variable that instructs the speed. Also, 2°3v~0.3
The range of V instructs forward movement, and the value obtained by subtracting the lower limit of play in the neutral position, 2.3 V, from that voltage value becomes the manipulated variable that instructs speed. These operations i1 are passed to a section of the microcomputer device 4 serving as a motor control device, and that section controls the speed of the motor 6 via the motor drive circuit 5.

In this embodiment, (1) When the neutral detection switch 2 is in the neutral position, the accelerator volume 1 is not within the neutral tolerance range.

(2) [Neutral detection switch l does not detect neutral when power is ON.

(3) The voltage value of accelerator volume 2 is within the range of disconnection or short circuit.

It is possible to determine In other words, in this embodiment, by placing resistors at both ends of the accelerator volume 1, it is possible to determine whether the accelerator volume 1 is abnormal, and it can be made more stable, including determining the state of the neutral detection switch 2 when the power is turned on. It is possible to improve sexual performance.

Note that the present invention is widely applicable to electric devices that have an operation mechanism and control a drive mechanism to perform movement or work. As described above, the present invention can be applied in various ways and can take various embodiments in accordance with its gist.

[Effects of the Invention] As is clear from the above explanation, according to the manipulated variable detection device of the present invention, when detecting the manipulated variable using the volume, the voltage of the volume, including variations in the operating mechanism and volume, etc. By automatically setting the relationship between the value and the manipulated variable, the following effects can be obtained.

(1) Assembly and adjustment man-hours can be reduced.

(2) Optimal settings can be made and operability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a setting example according to the above embodiment. l...Accelerator volume, 2...Neutral detection switch, 3...A/D converter, 4...Microcomputer device. Figure 2

Claims (1)

[Claims] (1) An operation amount detection device that detects an operation amount of an operation mechanism from a reference position by a change in voltage value of a volume, comprising means for detecting the reference position in conjunction with the volume, and a means for detecting the reference position at the reference position. means for setting a relationship between the manipulated variable and the voltage value of the volume based on the voltage value of the volume when detected; and means for detecting the manipulated variable by determining a change in the voltage value of the volume based on the relationship; A manipulated variable detection device comprising: