JPH0372287A - Inclination measuring device for two-wheeler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-wheeled vehicle inclination angle measuring device that measures the inclination angle of a vehicle body using an ultrasonic sensor.

(Prior art) Conventionally, when measuring the inclination angle of a two-wheeled vehicle while it is running, an ultrasonic sensor is installed on either the left or right side of the vehicle body, and the ultrasonic sensor emits ultrasonic waves toward the road surface (earth). At the same time as transmitting a signal, the reflected signal from the road surface is received.Then, the distance between the ultrasonic sensor and the road surface is measured based on the time between transmitting the ultrasonic signal and receiving it, and the distance between the ultrasonic sensor and the road surface is measured based on the measurement result. The angle of inclination is being measured.

(Problem to be Solved by the Invention) However, in the conventional inclination angle measuring device as described above, if noise enters the receiving signal line before receiving the ultrasonic signal reflected on the road surface, the received signal may be distorted. There was a problem that the angle of inclination could not be measured accurately. In particular, when the rotation angle of the headlight is controlled by the motor C in accordance with the measured inclination angle, noise is generated when the motor is started, making it easy to erroneously detect the received signal.

The present invention has been made in view of these problems, and an object of the present invention is to provide a two-wheeled vehicle inclination angle measuring device that can prevent erroneous detection of received signals and accurately measure the inclination angle.

[Means to solve the problem]

The inclination angle measuring device for a two-wheeled vehicle according to the present invention is constructed as follows.

a. A two-wheeled vehicle in which an ultrasonic sensor is installed on the vehicle body, and the tilt angle of the vehicle body is measured from the temporal relationship between the ultrasonic signal emitted from the ultrasonic sensor toward the road surface and the received ultrasonic signal reflected from the road surface. In the inclination angle measuring device for vehicle use, the ultrasonic sensors are installed on both the left and right sides of the vehicle body, and ultrasonic signals are emitted alternately from these ultrasonic sensors, and signals detected simultaneously by both sensors are canceled.

b. In the inclination angle measuring device of (a) above, a logic circuit is provided to take the logical product of the received signals from the left and right M sound wave sensors, and the received signal line is controlled by the output of the logic circuit to cancel the signals detected at the same time.

C1 In the inclination angle measurement device of a above, a CPU is provided to monitor the received signals from the left and right ultrasonic sensors, and this CPU
Simultaneously detected signals are canceled by arithmetic processing inside the U.

(Function) In the inclination angle measuring device for a two-wheeled vehicle of the present invention, ultrasonic waves No. 13 are alternately emitted from the ultrasonic sensors provided on both left and right sides of the vehicle body, and reception signals detected simultaneously by both sensors are canceled. Therefore, noise that has entered the receiving signal line is canceled and only the reflected signal is received.

(Embodiment) FIG. 1 is a block diagram showing the configuration of a two-wheeled vehicle inclination angle measuring device according to an embodiment of the present invention. In the figure, la
, lb are ultrasonic sensors installed on the left and right sides of the vehicle body, 2a and 2b are emitted wave amplification units for amplifying the ultrasonic signals emitted from the respective ultrasonic sensors la and lb, and 3a and 3
b is a received wave J'1 width section that amplifies and detects the received ultrasonic signal reflected on the road surface, 4 is a NAND circuit (logic circuit) that takes the AND of the amplified received signal, and 5a and 5b are NAND
The output of the circuit 4 causes a received wave amplification section 3a.

An analog switch 6 controls the ON/OFF of the reception signal line from 3b, and a CPU 6 performs input/output control and arithmetic processing of the ultrasonic signals. The angle of inclination of the heavy object is determined by measuring the distance between it and the road surface.

Figure i2 shows the appearance of a two-wheeled vehicle equipped with the ultrasonic sensors la and Ib. Each ultrasonic sensor la, lb
Ultrasonic signals are alternately transmitted toward the road surface 7, and ultrasonic signals 8 reflected from the road surface 7 are received. and,
As described above, the tilt angle α of the vehicle body is measured from the time from transmitting the ultrasonic signal to receiving the reflected signal 8, and the rotation of the bed light 8, for example, is controlled according to the tilt angle α. In the figure, since the vehicle body is tilted to the right, the headlight 8 is rotated in the direction of the arrow, and the illumination correction is performed.

Figure 3 shows the above two wheels! This figure shows the timing of the transmission and reception signals of the ultrasonic sensor 1a on the right and the M-sonic sensor 1b on the left, which are installed on the vehicle body of 7 (. Ultrasonic signals are transmitted, and accordingly, received signals are also received alternately.In the figure, W, .
, W, , indicate the reflected waves of the ultrasonic waves of each sensor la, lb, and Wa2. W, 2 indicates a reflected wave from the road surface 7. Here, the received signals detected simultaneously (at the same time) by both sensors la and lb are canceled, so that the reflected waves are detected without error. That is, both sensors 1a.

Since ultrasonic signals are transmitted alternately from 1b, the road surface 7
The reflected signals from the sensors 1a and 1b are not received at the same time, and the signals received at the same time by both sensors 1a and Ib are noise N□ caused by, for example, the engine ignition pulse or the headlight drive motor.

It is regarded as N bl+ Na2+ Nb2 and is canceled. In the circuit of FIG. 1, noises N□, N1. N-2. When Nb□ is received, N
The output section of the AND circuit 4 is input to the control terminals of the analog switches 5a and 5b, and the human power signal to the CPU 6 is
The line is in an OPEN state, and the signals during that time are canceled. Therefore, erroneous detection of received signals is prevented, and accurate tilt angle measurement is always performed.

FIG. 4 is a block diagram showing another embodiment of the invention. In the above embodiment, the NAND circuit 4 and analog switches 5a and 5b were provided to prevent noise components from being introduced into the CPU 6, but in this embodiment, the CPU monitors the received signals from each ultrasonic sensor la and lb, and C.P.
Simultaneously detected signals are canceled by arithmetic processing inside U6. In this case, the program ignores the data of the signals that are input manually to the CPU 6 at the same time, and the signals are canceled by software processing.

〔Effect of the invention〕

As described above, according to the present invention, ultrasonic signals are alternately emitted from the ultrasonic sensors provided on both the left and right sides of the vehicle body, and the received signals detected simultaneously by both sensors are canceled, so that the received signals are erroneously detected. This has the effect of preventing tilt angles from occurring and allowing accurate measurement of inclination angles.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an external view of a unicycle equipped with the ultrasonic sensor shown in Fig. 1, and Fig. 3 shows the transmission number 43 of each ultrasonic sensor and the received signal. A timing diagram showing the relationship, and FIG. 4 is a block diagram showing another embodiment of the present invention. la, 1b==Ultrasonic sensor 2a, 2b=...-Outgoing wave amplification section 3a, 3b...Reception decrease/increase M section 4...NAND circuit (logic circuit) 5a, 5b...
...Analog switch 6...-CPU 7...Road surface Figure 1

Claims (3)

[Claims] (1) An ultrasonic sensor is installed on the car body, and the tilt angle of the car body is measured from the temporal relationship between the ultrasonic signal emitted from the ultrasonic sensor toward the road surface and the received ultrasonic signal reflected from the road surface. The inclination angle measuring device for a two-wheeled vehicle is characterized in that the ultrasonic sensors are installed on both left and right sides of the vehicle body, and ultrasonic signals are emitted alternately from these ultrasonic sensors, and signals detected simultaneously by both sensors are canceled. Inclination angle measuring device for motorcycles. (2) A two-wheeled vehicle according to claim 1, characterized in that a logic circuit is provided for taking a logical product of received signals from the left and right ultrasonic sensors, and the received signal line is controlled by the output of the logic circuit to cancel simultaneously detected signals. Tilt angle measuring device. (3) The inclination angle measuring device for a two-wheeled vehicle according to claim 1, further comprising a CPU that monitors the received signals from the left and right ultrasonic sensors, and cancels simultaneously detected signals through arithmetic processing within the CPU.