阅读说明：本技术 无线轮速传感器 (Wireless wheel speed sensor ) 是由 张容容 刘金龙 陈金鹏 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种无线轮速传感器,包括能量获取单元、能量管理单元、轮速检测单元、信号处理单元、信号发送单元与信号接收单元,其中,能量获取单元产生电能；能量管理单元存储电能,并且向轮速检测单元、信号处理单元和/或信号发送单元提供电能；轮速检测单元采集轮速信号；信号处理单元将轮速信号转换为方波信号；信号发送单元通过无线网络将方波信号发送至信号接收单元；信号接收单元将来自信号发送单元的方波信号发送至车辆的电子控制单元。本发明中,无线轮速传感器采用无线通讯技术实现信号传输,因此无需进行线束设计,另外,无线轮速传感器通过能量获取单元产生电能从而实现自供电,无需外接电源。(The invention discloses a wireless wheel speed sensor which comprises an energy acquisition unit, an energy management unit, a wheel speed detection unit, a signal processing unit, a signal sending unit and a signal receiving unit, wherein the energy acquisition unit generates electric energy; the energy management unit stores electric energy and provides the electric energy to the wheel speed detection unit, the signal processing unit and/or the signal sending unit; a wheel speed detection unit acquires a wheel speed signal; the signal processing unit converts the wheel speed signal into a square wave signal; the signal sending unit sends the square wave signal to the signal receiving unit through a wireless network; the signal receiving unit transmits the square wave signal from the signal transmitting unit to an electronic control unit of the vehicle. In the invention, the wireless wheel speed sensor adopts a wireless communication technology to realize signal transmission, so that the wire harness design is not needed, and in addition, the wireless wheel speed sensor generates electric energy through the energy acquisition unit to realize self power supply without an external power supply.)

1. A wireless wheel speed sensor, comprising an energy acquisition unit, an energy management unit, a wheel speed detection unit, a signal processing unit, a signal transmission unit and a signal reception unit, wherein,

the energy-harvesting unit generates electrical energy,

the energy management unit stores the electric energy generated by the energy acquisition unit and provides the electric energy to the wheel speed detection unit, the signal processing unit and/or the signal transmission unit,

the wheel speed detection unit collects a wheel speed signal,

the signal processing unit converts the wheel speed signal collected by the wheel speed detection unit into a square wave signal,

the signal transmitting unit transmits the square wave signal to the signal receiving unit through a wireless network,

the signal receiving unit receives the square wave signal from the signal transmitting unit and transmits the square wave signal to an electronic control unit of the vehicle.

2. The wireless wheel speed sensor of claim 1, wherein the energy harvesting unit includes a magnetic core and a coil surrounding the magnetic core, one end of the magnetic core being disposed adjacent to the test wheel, rotation of the test wheel causing an induced voltage in the coil, thereby generating electrical energy.

3. The wireless wheel speed sensor of claim 2, wherein the teeth of the test wheel have alternating raised and depressed portions, and rotation of the test wheel causes the raised and depressed portions of the teeth to sequentially approach the magnetic core causing a change in magnetic flux over time, inducing an alternating voltage in the coil.

4. The wireless wheel speed sensor of claim 1, wherein the energy management unit includes a rechargeable battery and a super capacitor.

5. The wireless wheel speed sensor according to claim 1, wherein the signal processing unit performs waveform modulation, voltage stabilization, filtering and compensation adjustment on the sinusoidal wheel speed signal input by the wheel speed detection unit to obtain a square wave signal having the same frequency as the sinusoidal wheel speed signal.

6. The wireless wheel speed sensor of claim 1,

before the signal sending unit sends the square wave signal, the frequency selection, the signal modulation and the power amplification are carried out on the square wave signal so as to be beneficial to wireless transmission;

the signal receiving unit demodulates, denoises, selects and filters the signal from the signal transmitting unit.

7. The wireless wheel speed sensor according to claim 1, wherein the energy acquisition unit, the energy management unit, the wheel speed detection unit, the signal processing unit, and the signal transmission unit are provided at a knuckle or a rear axle of a vehicle.

8. The wireless wheel speed sensor of claim 1, wherein the signal receiving unit is provided at an interface of an electronic control unit of a vehicle.

Technical Field

The invention relates to the field of automobiles, in particular to a wireless wheel speed sensor.

Background

The wheel speed sensor is one of the important basic sensors of the automobile, and can not only monitor the current motion state of the wheel, but also indicate the running condition of the wheel after being integrated with some parameters and processed by a certain algorithm. Currently, an anti-lock brake system (i.e., ABS) has become the standard of a vehicle, which means that the application of a wheel speed sensor to the vehicle is indispensable. However, signals generated by the wheel speed sensor need to be transmitted through a wire harness, and the design of a vehicle chassis, parts of other systems of the vehicle (such as a shock absorber, an oil pipe and the like), and jumping and the like during the motion of the vehicle may interfere with the wire harness of the wheel speed sensor, so that cable abrasion occurs, and the sensor is damaged. That is to say, different wheel speed sensor installation environment has proposed higher requirement to wheel speed sensor's suitability and commonality, needs can satisfy the operation requirement in the time nimble real car environment of matching, and then provides complete solution for different motorcycle types and different chassis installation environment demands.

A significant portion of the wheel speed sensor design cycle is typically spent in communicating with the host plant for routing, including the length of the wiring harness, the choice of mounting and the location of the mounting, etc. Meanwhile, the conditions of interference of the chassis structure and the chassis mounting part in the later period and the like can also cause the change and the alteration of the wiring harness part, and further cause the delay of the design time.

Therefore, the conventional wheel speed sensor has the defects of adaptability and universality due to the fact that a wire harness is required for signal transmission.

Disclosure of Invention

The present invention is directed to a wireless wheel speed sensor, which solves the above-mentioned problems of the prior art.

An embodiment of the present invention provides a wireless wheel speed sensor including an energy acquisition unit, an energy management unit, a wheel speed detection unit, a signal processing unit, a signal transmission unit, and a signal reception unit, wherein,

the energy-harvesting unit generates electrical energy,

the energy management unit stores the electric energy generated by the energy acquisition unit and provides the electric energy to the wheel speed detection unit, the signal processing unit and/or the signal transmission unit,

the wheel speed detection unit collects a wheel speed signal,

the signal processing unit converts the wheel speed signal collected by the wheel speed detection unit into a square wave signal,

the signal transmitting unit transmits the square wave signal to the signal receiving unit through a wireless network,

the signal receiving unit receives the square wave signal from the signal transmitting unit and transmits the square wave signal to an electronic control unit of the vehicle.

Optionally, the energy harvesting unit comprises a magnetic core and a coil surrounding the magnetic core, one end of the magnetic core is disposed adjacent to the test wheel, and rotation of the test wheel causes an induced voltage to be generated in the coil, thereby generating electrical energy.

Optionally, the teeth of the test wheel have alternately raised portions and recessed portions, and rotation of the test wheel causes the raised and recessed portions of the teeth to sequentially approach the magnetic core to cause a change in magnetic flux over time, so that an alternating voltage is induced in the coil.

Optionally, the energy management unit comprises a rechargeable battery and a super capacitor.

Optionally, the signal processing unit performs waveform modulation, voltage stabilization, filtering and compensation adjustment on the sinusoidal wheel speed signal input by the wheel speed detection unit to obtain a square wave signal having the same frequency as the sinusoidal wheel speed signal.

Optionally, before the signal sending unit sends the square wave signal, the signal sending unit performs frequency selection, signal modulation and power amplification on the square wave signal to facilitate wireless transmission; the signal receiving unit demodulates, denoises, selects and filters the signal from the signal transmitting unit.

Optionally, the energy acquisition unit, the energy management unit, the wheel speed detection unit, the signal processing unit and the signal transmission unit are provided at a knuckle or a rear axle of the vehicle.

Optionally, the signal receiving unit is provided at an interface of an electronic control unit of the vehicle.

The wireless wheel speed sensor of the embodiment of the invention has at least the following advantages:

in the invention, the wireless wheel speed sensor adopts a wireless communication technology to realize signal transmission, so that wiring harness design is not needed, the time cost and the capital cost of designers are reduced, and the wireless wheel speed sensor has better adaptability and universality.

In the invention, the wireless wheel speed sensor can generate electric energy through the energy acquisition unit, thereby realizing self power supply without an external power supply.

Drawings

Further details and advantages of the present invention will become apparent from the detailed description provided hereinafter. It is to be understood that the following drawings are merely illustrative and not drawn to scale and are not to be considered limiting of the application, the detailed description being made with reference to the accompanying drawings, in which:

FIG. 1 shows a schematic diagram of a wireless wheel speed sensor according to one embodiment of the present invention.

Fig. 2 is a schematic diagram illustrating a structure of an energy acquisition unit of a wireless wheel speed sensor according to an embodiment of the present invention.

Fig. 3 shows an equivalent circuit diagram of an energy acquisition unit and an energy management unit of a wireless wheel speed sensor according to an embodiment of the present invention.

Fig. 4 shows a schematic diagram of a signal transmitting unit of a wireless wheel speed sensor according to an embodiment of the present invention.

Fig. 5 shows a schematic diagram of a signal receiving unit of a wireless wheel speed sensor according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of, and enabling description for, those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, any combination of the features and elements described below is contemplated as carrying out the invention, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims except where explicitly recited in a claim.

The invention provides a self-powered wireless wheel speed sensor. The invention aims to solve the problems caused by wiring harness of a wheel speed sensor in the installation process of a vehicle body, including early design investment and later road test faults. A power supply is provided for the wheel speed sensor through a self-powered technology so as to meet the requirements of an active sensor and signal transmission. Through setting up wireless transceiver module, realize the transmission of signal.

The invention provides a wireless wheel speed sensor system which can intelligently monitor wheel speed information in a wireless mode in real time and with low energy consumption. FIG. 1 shows a schematic diagram of a wireless wheel speed sensor according to one embodiment of the present invention. As shown in fig. 1, the wireless wheel speed sensor system mainly includes: the device comprises an energy acquisition unit, an energy management unit, a wheel speed detection unit, a signal processing unit, a signal transmitting unit and a signal receiving unit. The energy acquisition unit, the energy management unit, the wheel speed detection unit, the signal processing unit and the signal transmitting unit are located at a steering knuckle or a rear axle of a test wheel position of the vehicle to realize generation and transmission of a wheel speed signal, and the signal receiving unit is located at an interface of an electronic control unit of the vehicle to receive the wheel speed signal and transmit the wheel speed signal to the electronic control unit of the vehicle (such as a CAN bus or an ECU of the vehicle).

The energy acquisition unit is used for acquiring electric energy and is connected with the energy management unit so as to supply power to the energy management unit. Fig. 2 is a schematic diagram illustrating a structure of an energy acquisition unit of a wireless wheel speed sensor according to an embodiment of the present invention. As shown in fig. 2, the energy extracting unit includes a magnetic core and a coil surrounding the magnetic core, one end of the magnetic core is disposed adjacent to the test wheel, and the rotation of the test wheel causes an induced voltage to be generated in the coil, thereby generating electric energy. The teeth of the test wheel have alternately arranged convex and concave portions which are sequentially brought close to the magnetic core to cause a change in magnetic flux with time, so that an alternating voltage is induced in the coil.

The energy management unit can adopt a hybrid energy storage technology of matching a rechargeable battery and a super capacitor to serve as a power supply end to supply power for the wheel speed detection unit, the signal processing unit and/or the signal transmitting unit so as to meet the basic working power utilization requirements of all units. The super capacitor is characterized by high charging speed and long cycle service life, and meets the requirements of the working environment of the wheel speed sensor (such as wide temperature range of the working environment). Fig. 3 shows an equivalent circuit diagram of an energy acquisition unit and an energy management unit of a wireless wheel speed sensor according to an embodiment of the present invention. When the wheel satisfies a certain wheel speed value, can satisfy the power consumption demand of whole equipment, for each part circuit provides stable electric energy, its own is equivalent to energy memory simultaneously, and the energy that provides to the energy acquisition unit is carried out the processing of stepping up and is preserved with the electric quantity. When the wheel speed is low, the stored energy is released to be used by each electric unit. When the voltage transmitted by the energy acquisition unit is unstable, the energy management unit needs to manage the voltage, mainly performs boosting processing on low voltage, voltage reduction processing on high voltage and full current voltage stabilization processing, and aims to stabilize the output current. The output end of the energy management unit can be connected to the wheel speed detection unit, the signal processing unit and the signal transmitting unit so as to guarantee the operation of each unit.

The wheel speed detection unit collects wheel speed signals. The power supply end of the wheel speed detection unit is connected with the energy management unit, so that the wheel speed detection unit can work normally. The signal output end of the wheel speed detection unit can be directly connected with the signal processing unit, the signal processing unit processes wheel speed signals, sinusoidal wheel speed signals obtained by testing the wheel speed detection unit are converted into square wave signals with the same frequency, and then the signal processing unit transmits the processed square wave signals to the signal transmitting unit.

If the signal processing unit is an active module, its electrical terminals may be connected to the energy management unit. It may also not be necessary to connect to the energy management unit if all elements of the signal processing unit are passive elements. The signal processing unit is mainly used for processing the sinusoidal wheel speed signal input by the wheel speed detection unit, and the processing mode comprises waveform modulation, voltage stabilization, filtering, compensation adjustment and the like so as to obtain a square wave signal with the same frequency. The signal processed by the signal processing unit enters a signal transmitting module.

The signal transmitting unit is an active module, and the electric connection end of the signal transmitting unit is connected with the energy management unit so as to transmit the processed wheel speed signal through a wireless network. Fig. 4 shows a schematic diagram of a signal transmitting unit of a wireless wheel speed sensor according to an embodiment of the present invention. As shown in fig. 4, the signal transmitting unit may perform frequency selection, signal modulation and power amplification on the square wave signal to facilitate wireless transmission.

The signal receiving unit is an active module, the power supply of the power connection end of the signal receiving unit is obtained from the vehicle through the connector, and the signal output end of the signal receiving unit is connected with the electronic control unit of the vehicle through the connector. Fig. 5 shows a schematic diagram of a signal receiving unit of a wireless wheel speed sensor according to an embodiment of the present invention. As shown in fig. 5, after the signal receiving unit receives the signal from the signal transmitting unit, the signal may be demodulated to recover the wheel speed signal information (frequency, phase, etc.). In addition, the signal receiving unit may perform LNA processing and LPF processing on the signal to improve the signal-to-noise ratio. The processed wheel speed signal is then directly transmitted to an electronic control unit of the vehicle, such as a CAN bus or an ECU of the vehicle, via a connector.

As described above, in the present invention, the energy acquisition unit, the energy management unit, the wheel speed detection unit, the signal processing unit, and the signal transmission unit of the wireless wheel speed sensor are installed at the knuckle or the rear axle at the position of the test wheel, and the signal reception unit is connected to the interface of the electronic control unit of the vehicle through the connector. The unit circuits can adopt MEMS technology to concentrate the circuit volume, reduce energy consumption and shorten signal transmission time. The rectifier of the energy management unit has power consumption influence, and a low-power Schottky rectifier (CTLSH 10-60M856 is recommended or an LTC3588-1 power supply chip is directly adopted) can be adopted. The energy management unit employs a low power linear regulator (recommended LTC1540) to manage the output of voltage current. The signal processing unit adopts a low-power consumption high-performance chip (PL 1167 is recommended). The energy management unit is not limited to a hybrid energy storage technology of matching a storage battery with a super capacitor, and a certain emerging micro-nano scale 'power generation ready-to-use' mode is also one of the future application directions.

Although the present invention has been described with reference to the preferred embodiments, it is not to be limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.