Specific rotating speed signal detection system

Abstract

The invention discloses a specific rotating speed signal detection system comprising a pulse wheel with a pawl, which is fixed between a motor output shaft and a transmission shaft; the sensor bracket is fixedly arranged on the motor shell; the sensor is mounted on the sensor bracket, and a gap between the sensor and the pulse wheel is 0.5-2mm; and the traveling data recorder receives the sensor pulse signal and converts the mileage through a K value. According to customer requirements, the calculated value is combined with the perimeter of the tire, so that the driving mileage of the whole vehicle can be seen on the traveling data recorder.

Description

TECHNICAL FIELD

[0001] The present application relates to a specific speed signal detection system, belonging to the technical field of automobile operation detection. BACKGROUND

[0002] With the popularization of export cars, consumers demand more and more for the installation of specified devices on export cars. The present application aims to install the specified driving recorders and sensors of customers to record the mileage of the whole vehicle. In order to meet the needs of customers, a monitoring method for monitoring the specific speed signal demand is needed to monitor the pulse wheel speed signal.

[0003] The traditional vehicle sensor is installed on the transmission case, and there is a row of proximity gears on the transmission shaft at the output end (connected to the rear axle / connected to the driving wheel). The change of proximity distance sensing is formed by the sensor to form a speed signal, which is then converted into a speed signal. New energy vehicles do not have a suitable installation position.

[0004] Some speed monitoring methods are to install sensors on the wheels or install sensors inside the motor. After internal discussion and exploration, it is confirmed that, given the large size of the sensor specified by the customer, the wheel space is limited and cannot be assembled; the motor is a mature product, and if it needs to be installed, it needs to be redeveloped. The tail of the motor adds space and cannot be achieved, and the tail is tightly adjacent to the battery. The cost of redesigning the rear end of the motor and the main shaft may be higher.

[0005] Under the existing conditions, a pulse wheel and its monitoring method are developed and designed, which can effectively solve this problem. The existing vehicle structure design pursues economy at the same time, but also brings new challenges. How to reduce the cost and install conveniently in such a limited space.

[0006] Therefore, an innovative solution must be found to achieve this. Not only does it need to consider the layout space of the existing parts of the chassis, but it also needs to consider not changing the size of the motor to save costs. This is an important issue currently faced in the design of this electric commercial vehicle, and it is also the key to promoting the sustainable development of the export electric vehicle industry and meeting the needs of users. SUMMARY

[0007] In order to solve the above problems, the present application proposes a specific speed signal detection system, which not only designs the pulse wheel structure and sensor bracket, but also uses the existing chassis space layout sensor to make it more reasonable and efficient to monitor the pulse wheel speed signal, effectively reducing the inaccuracy of the whole vehicle mileage caused by unstable signals.

[0008] A system with specific rotating speed signal requirement, comprising: a pulsed wheel with pawl, fixed between the motor output shaft and the transmission shaft; a sensor bracket, fixed to the motor housing; a sensor, installed on the sensor bracket and with a gap of 1-3mm from the pulsed wheel; adjust the distance between the pulsed wheel and the sensor bracket to 1-3mm, after installation, test according to the real vehicle, if the measured speed is less than the real vehicle speed, then reduce the distance between the two times; the driving recorder receives the sensor pulse signal and converts the mileage through K value.

[0009] The pulsed wheel is fixed between the motor output shaft and the transmission shaft, and is mechanically connected by a common bolt. The pulsed wheel rotates with the motor output shaft. The sensor monitors the pulsed wheel speed and is fixed on the motor housing through the bracket, avoiding interference with the cross beam. Through the structure (installation method and position) of the present application, the motor rotating speed (pulsed wheel rotating speed) can be efficiently and low-cost detected.

[0010] The further defined technical solutions of the present application are: Further, the pawl height of the pulsed wheel is 3-5mm, the width is 1 / 3-1 / 2 of the pawl spacing, and the material is 40Cr alloy steel with surface quenching.

[0011] Further, the pulsed wheel is a ring structure machined into shape, and 5 pawls are uniformly distributed in the circumferential direction. The installation hole pitch circle matches the connection hole position of the motor output shaft and the transmission shaft.

[0012] Further, the pulsed wheel is fixed by the connecting bolt of the motor output shaft and the transmission shaft, realizing axial positioning without additional installation structure.

[0013] Further, the sensor bracket is an L-shaped sheet metal part matched with the profile of the motor housing. One end is fixed to the motor housing by a bolt, and the other end is provided with a sensor mounting hole, ensuring that the sensing end of the sensor (2) is opposite the movement track of the pulsed wheel pawl.

[0014] A monitoring method for specific rotating speed signal requirement using the system described above, comprising the following steps: Fix the pulsed wheel with pawl structure at the connection between the motor output shaft and the transmission shaft, so that the pulsed wheel rotates synchronously with the motor output shaft; Fix the sensor on the motor housing through the sensor bracket, and adjust the gap between the sensor and the pulsed wheel to the detection range; Detect the number of times the pawl passes through when the pulsed wheel rotates using the sensor. Every 5 pawl signals are recorded as one revolution of the pulsed wheel; Calculate the K value based on the pulsed wheel rotating speed, the wheel rotating speed ratio i, and the tire rolling radius R. The K value is the number of sensor pulses corresponding to 1km of vehicle driving; Write the K value into the driving recorder, and calculate the total vehicle driving mileage based on the real-time pulse signal.

[0015] The technical scheme of the further limitation of the application is: Further, the calculation formula of K value is: Wherein: z is the number of pulse wheel ratchets, z=5, parameter i is the ratio of pulse wheel speed to wheel speed; parameter R is the rolling radius of the tire; the default K value of the recorder is 8000.

[0016] The beneficial effects of the application are: improving the utilization rate of chassis space, reducing the weight of the whole vehicle. The space arrangement of the sensor is reasonable and efficient to monitor the pulse wheel speed signal, effectively reducing the inaccuracy of the whole vehicle mileage caused by unstable signal. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is the space layout diagram of the pulse wheel, sensor and sensor support of the application.

[0018] Figure 2 The figure is the axial view of the pulse wheel. Figure 1

[0019] The figure is the axial view of the sensor support. Figure 3 Figure 1 BRIEF DESCRIPTION OF DRAWINGS: 1-pulse wheel, 2-sensor, 3-sensor support. DETAILED DESCRIPTION

[0020] The specific embodiments of the application are described in detail below, but it should be understood that the protection scope of the application is not limited by the specific embodiments.

[0021] The specific embodiments of the application are described in detail below, but it should be understood that the protection scope of the application is not limited by the specific embodiments.

[0022] Unless otherwise explicitly stated, throughout the specification and claims, the term "comprise" or its variants such as "contain" or "include" etc. will be understood to include the stated element or component, but not to exclude the presence of other elements or components.

[0023] Example 1

[0024] In the speed signal monitoring of a certain electric commercial vehicle, the monitoring method of the specific speed signal requirement is adopted, and the specific implementation process is as follows: I. Structure design part implementation Pulse wheel design: the pulse wheel is made of machining process as a whole. The installation point of the pulse wheel is consistent with the installation installation circle of the motor output shaft and the transmission shaft, which ensures the accurate alignment during installation. There are five ratchet structures around the pulse wheel. This structure can make the sensor more stably capture the rotation signal, and provide a reliable basis for subsequent speed calculation. ​Sensor bracket design: according to the space structure of the pulse wheel periphery, the sensor bracket is designed as L type. This simple structure not only facilitates installation, but also reliably fixes the sensor. At the same time, the size and shape of the bracket are accurately calculated to ensure that the sensor does not interfere with the surrounding components during operation. II. Fixed part implementation Pulse wheel fixation: select high-strength bolts of M10x30 type to firmly fix the pulse wheel between the motor output shaft and the transmission shaft. During installation, use a torque wrench to tighten the bolt to the specified torque of 35 N.m to ensure that the pulse wheel does not loosen during high-speed rotation. Sensor fixation: use M6x16 bolts to fix the sensor on the sensor bracket. During installation, ensure that the detection surface of the sensor faces the pawl of the pulse wheel, and the tightening torque of the bolt reaches 15 N.m to prevent the sensor from shifting during vehicle operation. Sensor bracket fixation: use M8x20 bolts to fix the sensor bracket on the pre-installed hole of the motor housing. The tightening torque of the bolt is 25 N.m, which makes the bracket tightly fit the motor housing and improves the stability of the sensor operation.

[0025] Installation steps of the tachograph sensor: 1. Remove the 4 bolts connecting the transmission shaft and the link motor, and remove the 4 fixing bolts connecting the transmission shaft and the motor flange. When removing the bolts, pull up the hand brake to prevent the vehicle from moving during disassembly.

[0026] 2. After removing the bolts, push the transmission shaft backward.

[0027] 3. Insert the pulse wheel into the middle of the flange and transmission shaft connection part. The hole distance corresponds to the length of the two holes of the flange.

[0028] Install the sensor base and sensor. Remove the housing bolts on the motor, fix the bracket on the motor body, and preliminarily install the sensor bracket on the motor. Install the sensor, loosen the hand brake, push the car, and let one paw of the pulse wheel be in the same horizontal plane as the sensor. Then lock the motor housing bolts.

[0029] 5. Adjust the distance between the sensor and the pulse disc. Adjust the distance between the pulse wheel and the sensor bracket to 1-3 mm. After installation, test according to the actual vehicle. If the measured speed is less than the actual vehicle speed, reduce the distance between the two.

[0030] III. Monitoring part implementation Rotation speed monitoring: After the sensor starts working, it monitors the rotation of the pulse wheel in real time. Since there are five pawls on the periphery of the pulse wheel, when the sensor detects that the pawl has passed by 5 times, it can confirm that the pulse wheel has rotated one circle, thereby accurately calculating the rotation speed of the pulse wheel. Parameter calculation and recording: The tire rolling radius R of the electric commercial vehicle is 0.35m, and the ratio i of the rotation speed of the pulse wheel to the rotation speed of the wheel is 4.3.

[0031] Given that the number of teeth z of the pulse wheel is 5, the K value can be calculated according to the formula , and the K value is calculated to be 9781.

[0032] Mileage recording: The sensor writes the calculated K value into the travel recorder. At the same time, the tire circumference of the vehicle is 2.198m.

[0033] The travel recorder automatically calculates and displays the total vehicle mileage based on the received K value and tire circumference. For example, when the sensor detects 9781 pulses, the travel recorder displays 1 kilometer of travel mileage.

[0034] Input the tire rolling radius, the number of teeth of the target wheel, the number of rotations of the target wheel, and the rotation speed of the wheel to calculate the K value.

[0035] During the entire implementation process, the gap between the sensor and the pulse wheel is maintained within the detection size range of 1-3mm to ensure that the sensor can accurately detect the pawl signal and reduce the calculation error of the total vehicle mileage caused by unstable signals. The specific gap value can be adjusted slightly according to the error.

Claims

1. A specific rotational speed signal detection system, characterized in that, include: A pulse wheel (1) with a pawl is fixed between the motor output shaft and the transmission shaft; a sensor bracket (3) is fixed on the motor housing; a sensor (2) is installed on the sensor bracket (3), and the rotation gap between the sensor's detection end and the pawl of the pulse wheel (1) is 0.5mm-2mm. The rotation gap is adjusted according to the difference between the measured vehicle speed and the actual vehicle speed; the driving recorder receives sensor pulse signals and converts them into mileage using the K value.

2. The system according to claim 1, characterized in that: The pawl height of the pulse wheel (1) is 3-5mm, the width is 1 / 3-1 / 2 of the pawl spacing, and the material is surface-hardened 40Cr alloy steel.

3. The system according to claim 1, characterized in that: The pulse wheel (1) is a machined ring structure with five pawls evenly distributed around its circumference. The pitch circle of its mounting hole matches the connection hole of the motor output shaft and the transmission shaft.

4. The system according to claim 1, characterized in that: The pulse wheel (1) is fixed by the connecting bolts between the motor output shaft and the transmission shaft, achieving axial positioning without additional installation structure.

5. The system according to claim 1, characterized in that: The sensor bracket (3) is an L-shaped sheet metal part that is adapted to the outline of the motor housing. One end of it is fixed to the motor housing by bolts, and the other end is provided with a sensor mounting hole to ensure that the sensing end of the sensor (2) is directly facing the pawl movement trajectory of the pulse wheel (1).

6. A monitoring method using the system described in claim 1, characterized in that, Includes the following steps: The pulse wheel (1) with a ratchet structure is fixed at the connection between the motor output shaft and the transmission shaft, so that the pulse wheel (1) rotates synchronously with the motor output shaft; The sensor (2) is fixed to the motor housing by the sensor bracket (3), and the gap between the sensor (2) and the pulse wheel (1) is adjusted to the detection range; The number of times the pawl passes through when the pulse wheel (1) rotates is detected by sensor (2). Every 5 pawl signals detected are recorded as one rotation of the pulse wheel. The K value is calculated based on the pulse wheel speed, the ratio of wheel speed to i, and the tire rolling radius R. The K value is the number of sensor pulses corresponding to each kilometer the car travels. The K value is written to the driving recorder, and the total vehicle mileage is calculated by combining it with the real-time pulse signal.

7. The monitoring method according to claim 6, characterized in that: The formula for calculating the K value is: Where: z is the number of pulse wheel pawls, z=5; parameter i is the ratio of pulse wheel speed to wheel speed; parameter R is the tire rolling radius; the recorder's default K value is 8000.

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