JP3078098U - Acceleration detection display for model car - Google Patents

Abstract

(57) [Summary] [Problem] To quantitatively determine a limit value of a cornering force, for example, by measuring acceleration acting on a remotely controllable vehicle model while traveling and transmitting obtained information to a pilot in real time. Is to provide a means for evaluation. An acceleration acting on a vehicle is detected by a sensor, and when a predetermined acceleration threshold is exceeded, a signal transmission means such as an LED or a buzzer is activated, and a cornering force exceeding a set value is given to a driver. And a device for transmitting the occurrence of an error.

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting and displaying acceleration for a model car that can be remotely controlled.

[0002]

[Prior art]

 It is important to perform cornering at the highest possible speed in circuit driving competitions of remotely operated model vehicles (hereinafter referred to as “vehicles”). For this purpose, it is necessary to determine the limit of the cornering force that can be generated by the vehicle.However, in the conventional method, the information obtained by visually observing the speed at the time of cornering and the cornering turning radius is obtained. Was inferred sensorially based on the results, and was inaccurate and poorly reproducible.

[0003]

[Problems to be solved by the invention]

 The problem of the present invention is to measure the acceleration acting on the running vehicle and to transmit the obtained information to the driver in real time, so that the limit value of the cornering force can be quantitatively evaluated, for example. It is to provide.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention measures the acceleration acting on the vehicle, and activates a signal transmission means such as light emission or sounding when the acceleration exceeds a preset acceleration threshold (hereinafter referred to as “set value”). In addition, the present invention provides a device capable of notifying a pilot that a cornering force exceeding a set value has occurred.

[0005] By using this apparatus to test-run a circuit at various set values, the cornering force generated during cornering can be quantified. More specifically, for example, the corner section in which the signal transmission means operates at the set value of 1.2G and does not operate at 1.3G is not less than 1.2G when cornering. It can be estimated that a cornering force of less than 3G is generated. By such a quantitative determination, it is possible to efficiently learn the vehicle setting and steering techniques that generate as large a cornering force as possible.

The above description particularly relates to cornering force, that is, acceleration in a direction perpendicular to the traveling direction of the vehicle. However, by setting the axis of the detected acceleration to be parallel to the propulsion direction, the acceleration of the vehicle is improved. Evaluation of performance and deceleration performance is also possible.

The main parts of the present device include an acceleration sensor, signal transmission means, and a microprocessor for controlling them. Among them, the acceleration sensor has one or two detection axes, and outputs a signal corresponding to the acceleration by, for example, generating a pulse having a predetermined duty ratio proportional to the acceleration of each axis. Is what you can do. The signal transmitting means is a mechanism capable of transmitting a signal to a driver operating the vehicle. For example, a light transmitting means such as an LED or a lamp or a sound generating means such as a buzzer can be used. A microprocessor is a device that can capture the signals of the aforementioned acceleration sensor, perform arithmetic processing, and control the operation of the aforementioned signal transmission means based on the results. The provision of the output display means makes it possible to easily change the set value.

[0008]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described. Here, as an example, an acceleration sensor having a single detection axis and generating a pulse having a predetermined duty ratio in accordance with the acceleration in the axial direction is used, and the acceleration detection axis is installed perpendicular to the vehicle traveling direction. The following describes the device. 1 to 6 show an embodiment of an acceleration detection and display device according to the present invention. FIG. 1 is a basic block diagram, FIG. 2 is a vehicle mounting diagram of a main body portion, FIG. 3 is a signal transmission means using LEDs, 4 is a mounting diagram of a signal transmitting unit using an LED, FIG. 5 is a mounting diagram of a signal transmitting unit using a buzzer, and FIG. 6 is a flowchart illustrating the operation of the present apparatus.

As shown in FIG. 1, the present apparatus comprises a main body 3, a signal transmitting means 4, and a display means 8. Each part is connected by a detachable connector 10, and each part can be connected as needed.

An acceleration sensor 6, a microprocessor 5, and an input means 9 are mounted on the main body portion 3. The acceleration sensor 6 has one or two detection axes. By generating a pulse with a duty ratio, a signal corresponding to the acceleration can be output to the microprocessor. As the specifications of the sensor, it is preferable that the measurement resolution is 20 mG or less and the measurement range is ± 1.5 G or more. The microprocessor 5 is capable of executing the arithmetic processing shown in the flow chart of FIG. 6, takes in the signal from the acceleration sensor 6 and the input from the input means 9 such as a push switch, and outputs the signal. 7 can output a signal to the operator, and when changing a set value, information can be output by controlling the display means 8, and various set values are stored. Means are provided internally. The display means 8 is a means capable of displaying various kinds of information by characters and the like, and for example, a liquid crystal display module or the like can be used. The display means 8 is connected via a connector 10 and can be attached and detached as required.

FIG. 2 shows an example in which the main body 3 is mounted on a vehicle. At this time, it is necessary to pay attention to the relationship between the detection axis of the acceleration sensor and the propulsion direction of the vehicle. The sensor should be mounted so that the detection axis is perpendicular to the propulsion direction when the cornering force is to be determined, and parallel when the acceleration / deceleration performance is to be measured.

Next, the signal transmitting means will be described. Here, a signal transmitting means using light when using an LED and a signal transmitting means using sound when using a buzzer will be sequentially described.

First, a signal transmission unit using an LED will be described. FIG. 3 is a schematic view of a signal transmitting means using an LED. The LEDs 11 are arranged radially, and are preferably mounted so that the LEDs can be visually recognized regardless of the positional relationship on the vehicle with respect to the driver, as shown in the mounting diagram of FIG. The LED may be directly driven by a microprocessor, or may be driven via a switching element such as a transistor when a large amount of light is required in an outdoor circuit or the like.

Next, a signal transmission unit using a buzzer will be described. FIG. 5 is a mounting diagram of a signal transmitting means using a buzzer. As the buzzer, for example, a piezoelectric buzzer with a built-in oscillation circuit can be used.

Next, the operation of the apparatus having the above configuration will be described based on a flowchart shown in FIG. First, in S1, it is determined whether or not a set value change command has been input by the input means 9 such as a push switch. If so, the set value is input in S2. At this time, for example, the current set value is displayed on the display means 8, and the value can be increased / decreased and determined by the input of the input means 9. The input set value is subjected to arithmetic processing in the microprocessor 5 and converted into a value corresponding to the pulse width input from the acceleration sensor 6, so that comparison with an actually measured value required later is facilitated. The factor value set in S3 can be used as the conversion coefficient at this time. Later, since the acceleration needs to be compared as an absolute value, two pulse width values on the + G side and -G side are prepared as the set value. The value obtained here is written in the storage means in the microchip.

Next, in S 3, it is determined whether or not a calibration execution command has been input by the input unit 9. Here, the calibration means a state where the acceleration is 0 G, that is, a state where the acceleration detection axis is parallel to the ground, and a state of +1 G, that is, a state where the acceleration detection axis is perpendicular to the ground, and a state of −1 G, that is, The pulse width of the signal output by the acceleration sensor is measured in three states, that is, the state in which the detection axis is rotated by 180 ° from the state of +1 G and the plane perpendicular to the ground, and these values are converted to the set value in step S2. Work that can be used as a factor in If the execution command has been input, the above-mentioned calibration work is performed in S4, and the factor value is written in the storage means in the microchip.

Next, in S5, the pulse width output from the acceleration sensor is measured. At this time, fine vibrations of the vehicle body are also measured as noise and added as acceleration. In order to reduce this effect, it is desirable to measure and average the pulses a plurality of times at regular time intervals, for example, at intervals of 10 ms. Is to integrate the values measured from 8 to 16 times.

Next, in S6, it is determined whether or not the absolute value of the measured acceleration value exceeds the absolute value of the set value. More specifically, assuming that the larger one of the two pulse widths set in S2 is A, the smaller one is B, and the integrated value of the pulse width measured in S5 is C, if C is larger than A or C is If it is smaller than B, it is determined that the absolute value of the actually measured acceleration value has exceeded the absolute value of the set value.

If it is determined in S6 that the absolute value of the measured acceleration value exceeds the absolute value of the set value, the signal transmission means is driven in S7.

More specifically, when the signal transmission means uses an LED, the LED is turned on for a certain period of time and then turned off. At this time, the predetermined time is, for example, 20 ms. Alternatively, if the signal transmission means uses a buzzer, the buzzer sounds for a certain time and then stops. At this time, the fixed time is, for example, 50 ms to 80 ms.

Next, returning to S 1, the apparatus can be operated by repeating these steps.

[0022]

[Effect of the invention]

 According to the device of the present invention, for example, the limit value of the cornering force can be quantitatively evaluated by measuring the acceleration acting on the moving vehicle and transmitting the obtained information to the operator in real time. And so on.

[Brief description of the drawings]

FIG. 1 is a basic block diagram of a model vehicle acceleration detection display device of the present invention.

FIG. 2 is a diagram showing a main body of the device of the present invention mounted on a vehicle.

FIG. 3 is a schematic diagram of a signal transmission unit using an LED.

FIG. 4 is a diagram illustrating a signal transmission unit using LEDs mounted on a vehicle.

FIG. 5 is a diagram showing a signal transmission unit using a buzzer mounted on a vehicle.

FIG. 6 is a flowchart showing the operation of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Model vehicle chassis part 2 Model vehicle body part 3 Body part 4 Signal transmission means part 5 Microprocessor 6 Acceleration sensor 7 Signal transmission means 8 Display means 9 Input means 10 Connector 11 LED

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[Procedure amendment]

[Submission date] February 6, 2001 (2001.2.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (1)

[Utility model registration claims] 1. A device mounted on a remotely controllable vehicle model, which detects acceleration acting on the device and transmits a signal according to the acceleration, thereby transmitting acceleration information to a driver.