KR19990058439A - Speed and rotation direction sensing device and method using wheel speed sensor - Google Patents

Abstract

The present invention relates to an apparatus and a method for detecting a speed and rotation direction using a wheel speed sensor, and in particular, a wheel (10) which protects a tire of the wheel while simultaneously rotating the wheel mounted on an unspecified vehicle; A light emitting diode 20 emitting predetermined light to the wheel 10; A light receiving diode 30 for detecting light emitted from the light emitting diode 20; A first sensor (40) for emitting pulses for the light received from the light receiving diodes (30); A second sensor 50 having the same electrical function as the first sensor 40; A microcomputer 60 for recognizing pulses applied from the first sensor 40 and the second sensor 50; It characterized in that it comprises an ECU 70 for detecting whether the forward rotation or the reverse rotation using the pulse applied to the microcomputer 60, the present invention is a predetermined wheel mounted on the wheel of the unspecified vehicle In the part, two sensors are installed to detect the speed of the vehicle or the rotation of the wheels, so that the current transmission is in the forward or backward direction, so that the driver knows which force should be applied. There is effect to help safe driving.

Description

Speed and rotation direction sensing device and method using wheel speed sensor

The present invention relates to a device and a method for detecting the speed and direction of a vehicle, in particular, by mounting two sensors on the wheel for protecting the tires mounted on the lower side of both sides of the unspecified vehicle, the rotational speed and direction of the wheel The present invention relates to a speed and rotation direction sensing apparatus and method using a wheel speed sensor to detect a state of a transmission.

As is known, it is urgently required to secure a strong and stable brake performance according to the high performance of the vehicle and to stop the vehicle with sufficient braking force and stability under any conditions. The braking force for stopping the vehicle can be obtained by the friction force generated between the tire and the road surface. The magnitude of the friction force varies greatly depending on the condition of the road surface and the type of tire.

Conventional wheel speed sensors for detecting the speed of a vehicle include one each in the front left and right rear wheels and one in the rear drive wheel (sometimes, one in the drive shaft of the rear wheel). It is installed to detect the rotational speed of each wheel. The calculation of the slip ratio requires the speed of the vehicle body and the speed of the wheel, but the detection of the speed of the vehicle body is not easy. Therefore, the role of the wheel speed sensor is important because a method of estimating the speed of the vehicle body from a plurality of wheel speeds is adopted. Wheel speed sensor is a rotation sensor of electronic pickup is generally used, and the speed can be known by converting the period to the output of periodic pulses.

However, in the conventional wheel speed sensor as described above, the speed can be known by converting the period into the output of the periodic pulses, but even when the reverse rotation, the same pulse is output and the reverse direction cannot be detected, so that a costly accident There were problems such as frequent occurrence.

An object of the present invention, to solve the above-mentioned conventional problems, in the conventional wheel speed sensor for detecting the speed of a predetermined vehicle, by using the wheel speed sensor can detect the rotational direction of the vehicle. It is an object of the present invention to provide an apparatus and method.

In order to achieve the above object, the speed and rotation direction detecting device using the wheel speed sensor of the present invention rotates at the same time when a wheel mounted on an unspecified vehicle rotates and protects a tire of the wheel. and; A light emitting diode for emitting predetermined light to the wheel; A light emitting diode configured to sense light emitted from the light emitting diode; A first sensor for firing a pulse for the light received by the light receiving diode; A second sensor having the same electrical function as the first sensor; A microcomputer that recognizes pulses applied from the first sensor and the second sensor; It characterized in that it comprises an ECU for detecting whether the forward rotation or the reverse rotation using the pulse applied to the microcomputer.

In order to achieve the above object, the speed and rotation direction detecting method using the wheel speed sensor according to the present invention may be performed when the value of the pulse output from the second sensor for detecting the speed and rotation direction of the unspecified vehicle is low. Counting the falling edge (Falling Edge) of the first sensor for detecting the speed and rotation direction of the vehicle (S1), and the value that counts the falling edge is defined as CNT, CNT value sequentially input to the microcomputer Determine whether it is equal to the value initialized to (S2), if it is equal to the initially set value knows that it is rotating in the forward direction (S3), if the CNT value is entered in the reverse order to the initially set value is rotating in the reverse direction Knowing that (S4), it is characterized in that it is configured as a method for detecting the speed (S5) using the first sensor and the second sensor.

1 is a view showing the configuration of a device for reducing the speed and direction of rotation using a wheel speed sensor according to an embodiment of the present invention,

2 is a waveform diagram illustrating waveforms output from a first sensor and a second sensor of FIG. 1;

3 is a control flowchart illustrating a method of detecting a speed and a rotation direction using a wheel speed sensor according to an exemplary embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10: wheel 20: light emitting diode

30: light receiving diode 40: first sensor

50: second sensor 60: microcomputer

70: ECU

Hereinafter, an apparatus and method for detecting a speed and rotation direction using a wheel speed sensor according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a device for reducing the speed and the direction of rotation using a wheel speed sensor according to an embodiment of the present invention, as shown, at the same time as the wheels mounted on the unspecified vehicle rotates A wheel 10 which protects the tire of the wheel while rotating; A light emitting diode 20 emitting predetermined light to the wheel 10; A light receiving diode 30 for detecting light emitted from the light emitting diode 20; A first sensor (40) for emitting pulses for the light received from the light receiving diodes (30); A second sensor 50 having the same electrical function as the first sensor 40; A microcomputer 60 for recognizing pulses applied from the first sensor 40 and the second sensor 50; This embodiment includes an ECU 70 that detects whether the rotation is forward or backward by using the pulse applied to the microcomputer 60.

FIG. 2 is a waveform diagram illustrating waveforms output from the first sensor and the second sensor of FIG. 1, and as shown in FIG. 2, waveforms output from the first sensor 40 and the second sensor 50 are set to low. The rising edge is called a rising edge, and the waveform output from the first sensor 40 and the second sensor 50 falls from high to low is called a falling edge, and the rising edge is connected to two rising edges. One polling edge is added and time becomes.

In addition, the first ① of the first sensor 40 will indicate that there is only one falling edge in the first sensor 40 when the second sensor 50 is in the first low state. Denotes two polling edges and one rising edge in the second low state of the second sensor 50, and the third ①, ②, and ③ indicate that the second sensor 50 is in the third low state. Three polling edges and two rising edges, each state is configured to initialize the microcomputer 60 in the present embodiment.

3 is a control flow diagram illustrating a method of detecting a speed and a rotation direction using a wheel speed sensor according to an embodiment of the present invention. As shown in FIG. 2 When the value of the pulse output from the sensor 50 is low, counting the falling edge of the first sensor 40 for detecting the speed and the rotation direction of the vehicle (S1), the value to count the falling edge It is defined as CNT, and determines whether the CNT value sequentially input to the microcomputer 60 is the same as the value initialized in advance (S2), if it is equal to the initially set value knows that it is rotating in the forward direction (S3), When the CNT value is input in the reverse order of the initially set value, it knows that the state is rotating in the reverse direction (S4), and thereafter, detecting the speed using the first sensor 40 and the second sensor 50 (S5). Obtain this embodiment including Sung.

Hereinafter, a speed and rotation direction sensing apparatus and method using the wheel speed sensor configured as described above will be described in more detail with reference to the accompanying drawings.

First, as shown in FIG. 1, the light emitting diodes 20 and the light receiving diodes 30 are mounted in parallel with each other on a predetermined wheel 10 mounted at a central portion of a tire that plays a role of an unspecified vehicle. At this time, instead of the light emitting diodes 20 and the light receiving diodes 30, a holifact type or a magnetic pickup may be provided.

Thereafter, two first sensors 40 and two sensors 50 are mounted on both side surfaces of the light receiving diode 30, and the microcomputer 60 of the ECU 70 in which the two sensors are mounted in the vehicle. Connect with each other.

Using the state of the pulses output from the first sensor 40 and the second sensor 50 connected to the microcomputer 60, the speed and the rotation direction of the vehicle is sensed, the first sensor 40 is A constant pulse as shown in FIG. 2 is output.

In addition, the second sensor 50 having the same electrical function as the first sensor 40 outputs a low pulse and a high pulse at regular intervals, and the microcomputer 60 detects the speed and the rotation direction by using the same. .

In order to detect the direction of rotation in the microcomputer 60, first, when the value of the second sensor 50 is low, the falling edge of the first sensor 40 is counted (S1), that is, a CNT value is obtained.

Subsequently, it is determined whether the value set in the microcomputer 60 is equal to the sequentially input CNT value using the CNT value (S2), and if it is the same, it is recognized that the wheel of the current car is in the forward rotation state (S3). .

However, if the CNT value is opposite to the value set in the microcomputer 60, it is recognized that the wheel of the vehicle is in the reverse rotation state (S4), and then the speed is detected (S5).

In the ECU 70, the speed is detected by multiplying the pulse output by the rotation of the wheel 10 once, and multiplying the diameter of the wheel by 2π *.

Based on the principle described above, the rotational speed and the rotational direction of the wheel can be known, and thus an unspecified driver can know the state of the transmission before the vehicle starts, and can drive according to the state of the transmission.

On the other hand, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention, it can be applied to any device for detecting the vehicle speed.

As described above, the apparatus and method for detecting the speed and rotation direction using the wheel speed sensor according to the present invention may include two sensors mounted on a predetermined wheel part mounted on an unspecified wheel of a vehicle to determine the speed or wheel of the vehicle. By detecting the rotational state, it is possible to detect whether the current transmission state is in the front or the rear, so that the driver can know which side to give more power, and has the effect of helping to drive safely.

Claims (3)

A wheel 10 that protects the tire of the wheel while simultaneously rotating the wheel mounted on the unspecified vehicle; A light emitting diode 20 emitting predetermined light to the wheel 10; A light receiving diode 30 for detecting light emitted from the light emitting diode 20; A first sensor (40) for emitting pulses for the light received from the light receiving diodes (30); A second sensor 50 having the same electrical function as the first sensor 40; A microcomputer 60 for recognizing pulses applied from the first sensor 40 and the second sensor 50; Speed and rotation direction detection device using a wheel speed sensor, characterized in that it comprises an ECU (70) for detecting whether the forward rotation or the reverse rotation using the pulse applied to the microcomputer (60). The speed using the wheel speed sensor according to claim 1, wherein the light emitting diodes and the light receiving diodes may be used in place of the light emitting diodes or the light receiving diodes by using a holifact type or a magnetic pickup according to the characteristics of the vehicle. And rotation direction detection device. When the value of the pulse output from the second sensor for detecting the unspecified speed and rotation direction of the vehicle is low, the falling edge of the first sensor for detecting the speed and the rotation direction of the vehicle is counted. (S1), the value of counting this polling edge is defined as CNT, and it is determined whether the CNT value sequentially input to the microcomputer is equal to the value initialized in advance (S2), and if it is equal to the initially set value, it rotates in the forward direction. Knowing that the state (S3), if the CNT value is input in the reverse order to the initially set value knows that the state is rotating in the reverse direction (S4), then detects the speed using the first sensor and the second sensor (S5) Speed and rotation direction detection method using a wheel speed sensor, characterized in that configured to include.