JPS59188562A - Preventing and warning device for fall down of vehicle - Google Patents

Abstract

PURPOSE:To detect the angle of a bank and generate a warning when there is the possiblity of fall down by providing an acceleration sensor consisting of the 1st sliding resistor and the 2nd sliding resistor, an analog digital converter, etc. CONSTITUTION:The acceleration sensor 5 consists of the 1st sliding resistor 51 which consists of a sliding contact 51d and a sliding resistance 51c while supported pivotally on a support shaft 51a and the 2nd sliding resistor 53 which consists of a sliding resistance 53b and a sliding contact 53a freely oscillating in the axial direction of said support shaft 51a by a weight 54 and a spring 52. Then, the values of the 1st sliding resistor 51 and the 2nd sliding resistor 53 are converted into digital signals by the analog-digital converter of the 1st interface 7a. Those digital signals are inputted to the input port of a CPU8 to calculate the angle theta (degree) of the bank, generating a warning when there is the possibility of falling down.

Description

[Detailed Description of the Invention] 1) Outline of the Invention The pulmonary injection system of the present invention uses signals from an acceleration sensor and a vehicle speed sensor to a central processing unit (hereinafter referred to as rcPUJ) in order to prevent a vehicle 11, particularly a two-wheeled vehicle 11, from overturning. A vehicle overturn prevention alarm that automatically prevents the vehicle from overturning by activating the warning means when the vehicle is in a position where it is likely to overturn, and prompting the driver to control the vehicle's position. It is related to the device.

2) Prior art and its problems Conventionally, an acceleration sensor 3 as shown in FIG. 1 has been devised. In the conventional acceleration sensor 3, a sliding resistor 31 is connected to a weight 3d that can freely swing around a support shaft 3c, and the sliding resistor 31 is connected in series with a power source 1, an ignition switch 2, and a lamp 4. The weight 3d is configured to be connected to the weight 3d.
When the weight 3 responds to the acceleration or deceleration of the vehicle, the weight 3
The resistance value of the sliding resistor 31 connected to d changes, and therefore the brightness of the lamp 4 changes in accordance with the acceleration.

However, for example, when issuing a fall prevention warning due to an excessive bank angle when a two-wheeled vehicle runs on a curve, the following formula is required to analyze the bank angle based on information from the acceleration sensor.

In Figure 2, Fx[N] is centrifugal force, Fy[N] is gravity, and FCN] is F
The resultant force of x・FY, mcKyl is the mass of the weight, gCm/s
2] is the gravitational acceleration, α [degrees] is the vertical axis direction of the two-wheeled vehicle, and F
The angle θ [degrees] is the bank angle, which is the angle between the vertical axis direction of the two-wheeled vehicle and the vertical axis of the pendulum from the fulcrum C to the road surface. Then, the following relationship holds.

Fy=m-g=F-cos(t)-α) [N], °, θ
= cos (-ry-) + α [degrees] ・・・・・・・・・
・・・・・・・・・・・・In other words, to calculate the bank angle θ [degrees], two pieces of information, F [N] and α [degrees], are required, but with the conventional acceleration sensor, F There was no means to detect the force component in the direction, and the bank angle θ [degrees] could not be calculated.

Therefore, when the two-wheeled vehicle is running on a curve, the bank angle θ [
Bank angle θ [degree]
It has been impossible to detect the angle of the vehicle and issue an alarm when the vehicle is tilted at an angle near which there is a possibility of overturning.

Furthermore, the bank angle θ [degrees] at which there is a possibility of overturning changes depending on the vehicle speed and road surface conditions, and it is not possible to issue an appropriate warning using just an acceleration sensor as in the prior art.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle overturn prevention warning system capable of analyzing a bank angle θ (degrees) that eliminates the above-mentioned drawbacks of the prior art.

3) Structure and operation of the present invention (to) Structure of the present invention FIGS. 3 and 4 are diagrams showing the structure of the acceleration sensor of the first embodiment of the apparatus of the present invention. The acceleration sensor 5 is the support shaft 5
A first sliding resistor 51 consisting of a sliding contact 51d and a sliding resistor 51c, which is fixed to an arm 51b that is pivoted on the arm 51b and can swing freely in the rotational direction, a weight 54, and a spring 52, The second sliding resistor 53 includes a sliding contact 53a that can freely swing in the axial direction and a sliding resistor 53b. 5 and 6 are system block diagrams of the apparatus of the present invention.

The vehicle speed sensor 6 and the acceleration sensor 5 are connected to the input part of the first interface 7a, and the output part is connected to the CPU.
8, and the CP) U-8 also includes oscillators 1'0. A settle generating circuit 11, a sensitivity selector switch 12, and a display switch 13 are connected to the IJ, a second interface 7b is connected to the output port, and an alarm means 9 is connected to the output part of the second interface 7b. , the alarm means 9 is an alarm device 9a.
and a display 9b, and an ignition switch 2 is interposed between the input section of the reset pulse generation circuit 110 and the power supply 1.

The acceleration sensor of the second embodiment has a conductive surface 55 formed concentrically with the first sliding resistor 51 of the acceleration sensor shown in FIG.
is interposed.

(a) Function of the present invention The present invention will be explained in detail below with reference to FIGS. 3 to 9.

In FIGS. 3 and 4, when centrifugal force and gravity act on the weight 54, the sliding contact 5 fixed on the arm 51b of the first sliding resistor 51 moves centrifugally around the support shaft 51a. Follows the resultant force of force and gravity. At the same time, the spring 52 expands and the sliding contact 53a of the second sliding resistor 53 follows the resultant force of centrifugal force and gravity.

Therefore, the resistance between the terminals 5a and 5b of the first sliding resistor 51 and the resistance between the terminals 5a + 5c of the second sliding resistor 53 change according to the resultant force of centrifugal force and gravity. . The values of the first sliding resistor 51 and the second sliding resistor 53 are converted into digital signals by the analog-to-digital converter of the first interface 7a. Further, the output of the vehicle speed sensor 6, which outputs an analog signal corresponding to the vehicle speed, is converted into a digital signal by the analog-to-digital converter of the first interface 7a.

The digital signals are respectively input to the input ports of the CPU 8, the bank angle θ (degrees) is calculated, and the calculation result is compared with the alarm condition to issue an alarm.

Hereinafter, the operating mode of the system will be further explained with reference to the system diagram in FIG. 5 and the flowchart in FIG. 8. The first step is to turn on the ignition switch 2.
The reset pulse generation circuit 11 operates to put the CPU 8 into the initial state, and at the same time as the CPU 8 starts -f, the CPU
Fixed memory in B, for example ROM (, Read On
Weight 54 stored in advance in lyMemory)
mass m [gl], gravitational acceleration g [m/S2], military speed threshold coefficient 1 [N-5/m], and 2 [N-5ArL]
, DOWN instruction angle D [degrees], UP instruction angle U [degrees], and bank angle limit angle K [degrees].

As the second step, if the sensitivity selector switch 12 is ON,
To shift the bank angle limit angle K, shift angle 3=x[
: degrees], and if it is OFF, the shift angle is S20 degrees.

As the third step, open the input port of CPU 8 and
The data of the vehicle speed sensor 6 V [m, /s] and the data of the first sliding resistor 51 α [
degree], and data of the second sliding resistor 53 F [N]
into volatile memory in CPU B, such as RAM (Ra
ndom Access Me-mory),
Calculate the bank angle θ [degrees].

As the fourth step, check whether the calculation result of the bank angle θ [degrees] is greater than or equal to the limit angle of the bank angle θ [degrees] by -s [degrees], or if the vehicle speed is low (F≦v-, [N] and Overkill α≧u−s
When the temperature is [degrees], the alarm means is activated and the UP display is displayed.
Also, if the vehicle speed (F≧v− is 2 [N] and too high is α≧D
[degrees], the alarm means is activated, a DOWN display is displayed, and the process returns to the second stage. After that, turn ignition switch 2 to O.
Steps 2 to 4 are repeated until FF occurs.

In the above mode, data from the acceleration sensor 5 and vehicle speed sensor 6 is sent to the CPU 8 when the two-wheeled vehicle is in a position where there is a possibility of overturning due to excessive bank angle θ [degrees], excessively tilted vehicle body, or excessively raised vehicle body. The system analyzes this and displays an UP or DOWN display using the warning means to alert the driver.

The UP or DQWN display by the warning means 9 is, for example, a method of issuing a warning by voice synchronization or a display method shown at 9b in FIG. 6.

Further, the area where UP or DOWN display is performed is the area shown in FIG. Note that the area indicated by the broken line and the two-dot chain line corresponds to the case where the sensitivity selector switch 12 is turned on, and the determination level for excessively tilting the vehicle body is made strict.

Next, the operation of the second embodiment of the present invention will be explained with reference to FIG.

In the second embodiment, when the two-wheeled vehicle is parked or stopped, when +F*1diL is generated for some reason, the sliding contact 51d and the conductive surface 55 come into contact, and the alarm device 14, for example, sounds the horn, causing the gasoline to flow out. It is equipped with a means to prevent this from happening.

Incidentally, the display switch 13 is a switch for turning off the display when the alarm means 9 is used in combination with a voice chorus and a display.

4) Effects of the present invention The present invention has the following effects due to the above-described configuration and operation.

(7) The bank angle θ [degrees] of a vehicle, especially a two-wheeled vehicle, can be calculated using an acceleration sensor equipped with means for measuring the direction and magnitude of the resultant force of centrifugal force and gravity applied to the vehicle, and a CPU.

(b) By using the sensitivity selector switch to switch between warning areas for driving in the rain and driving in clear weather, a slip prevention warning can be issued when driving in the rain.

(1) By setting the CPU to a reset state using the reset pulse generation circuit when the ignition switch is turned on, the CPU can be activated from the initial state, and false alarms due to malfunctions when the ignition switch is turned on can be eliminated.

2) By arranging another conductive surface concentrically with the sliding resistance of the first sliding resistor, an alarm will sound even if a two-wheeled vehicle falls over due to an accidental cause when stopped under an eaves. This will prevent gasoline from flowing out.

(3) The first and second sliding resistors of the acceleration sensor,
By forming an insulating layer on a gold layer substrate, an acceleration sensor with good heat dissipation and resistance to radio wave interference can be provided.

[Brief explanation of drawings]

FIG. 1 shows a conventional acceleration sensor. FIG. 2 is a diagram showing the force components of centrifugal force and gravity applied to the two-wheeled vehicle when the two-wheeled vehicle is running. FIG. 3 is a configuration diagram of the acceleration sensor of the present invention. Fourth
The figure is a diagram of a specific structural example of the acceleration sensor of the present invention. FIG. 5 is a system block diagram of the apparatus of the present invention. FIG. 6 is a drowsiness circuit diagram showing a specific example of the circuit shown in FIG. FIG. 7 is a diagram showing, with diagonal lines, the positions of the weights that are likely to fall while the two-wheeled vehicle is running on a curve. FIG. 8 is an example of a flowchart of the system of the apparatus of the present invention. FIG. 9 is a diagram of a second embodiment of the acceleration sensor of the device of the present invention. 1...DC power supply, 2...Ignition switch, 3
．． 5... Acceleration sensor, 4... Lamp, 6...
Vehicle speed sensor, 7... Interface, 8... Central processing unit, 9... Alarm means, 10... Oscillator, 1
DESCRIPTION OF SYMBOLS 1... Reset pulse generation circuit, 12... Sensitivity changeover switch, 13... Display switch, 14...
・Alarm device, 15... Two-wheeled vehicle, 51... First sliding resistor, 53... Second sliding resistor, 55... Conductive surface Akigami patent applicant JP-A-Sho 59-188562 (7) Figure 9 401-

Claims (1)

[Claims] 1) A first sliding resistor that slides in response to the inclination of the vehicle and centrifugal force on the vehicle, and a second sliding resistor that slides in response to the resultant force of centrifugal force and gravity on the vehicle. an acceleration sensor consisting of a sliding resistor; and a processing device for processing an analog D signal for converting an analog signal proportional to the resistance value of each sliding resistor of the acceleration sensor and the vehicle speed of the vehicle into a digital signal. , a second interface that converts the output of the central processing unit into a signal capable of driving an external electric generator, an alarm means driven by the second interface, and an ON/OFF switch of the ignition switch of the vehicle. A vehicle fall prevention alarm bag f consisting of a reset pulse generation circuit that generates a glue set pulse to initialize the device, and a sensitivity changeover switch to switch the alarm area.
#. 2) The vehicle overturn prevention alarm device according to claim 1, wherein the first and second sliding resistors of the acceleration sensor are formed on a metal substrate with an insulating layer interposed therebetween. 3) A conductive surface formed concentrically with the first sliding resistor of the acceleration sensor so as to come into contact with the sliding contact of the first sliding resistor when the vehicle falls over. Vehicle rollover prevention alarm device as described in Section 2. 4) The alarm head is connected to a conductive surface formed on a concentric circle with the tenth sliding resistor of the acceleration sensor so as to come into contact with the sliding contact of the tenth sliding resistor when the vehicle falls. A fall prevention alarm device for a vehicle according to claim 1.