Hub motor Hall-to-ABS wheel speed signal conversion device

Abstract

The utility model discloses a Hall-to-ABS wheel speed signal conversion device for a hub motor. The Hall-to-ABS wheel speed signal conversion device comprises an ABS controller, a Hall wheel speed converter, a filter, an optocoupler, an operational amplifier, a constant-current sampling resistor, a power triode and a low-dropout linear regulator. By means of the structure, the Hall sensor of the rear wheel hub motor of the electric motorcycle is utilized, and current signals of 7 mA to 14 mA of the wheel speed sensor are output through conversion of a related control circuit. Compared with a traditional ABS electrical structure, the cost of a wheel speed sensor and a gear ring of a rear wheel is saved, and the Hall sensor of the rear wheel hub motor of the electric motorcycle does not make direct contact with the external environment, so that it is not needed that scrap iron adsorbed on the surface of the sensor in the running process needs to be cleaned regularly like a traditional wheel speed sensor, and the cost is reduced. The method has the advantages that the ABS installation cost is reduced, and later maintenance is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a wheel hub motor Hall-turn ABS wheel speed signal device. Background Art

[0002] In China, according to the "Mandatory Technical Requirements for Motorcycles, Mopeds and Engine Crankshafts", newly certified two-wheeled motorcycles, three-wheeled motorcycles and two-wheeled mopeds must be equipped with an anti-lock braking system (ABS) from July 1, 2019. In addition, the "Technical Conditions for Motor Vehicle Operation Safety" stipulates that from July 1, 2022, newly produced motorcycles must be equipped with ABS anti-lock braking systems.

[0003] China currently has no clear regulations requiring the installation of anti-lock braking systems (ABS) on electric motorcycles and electric mopeds. However, as people's economic level improves and they pay more attention to riding safety, people consider whether an electric motorcycle is equipped with an anti-lock braking system as one of the main factors when purchasing it. Therefore, more and more electric vehicle manufacturers have begun to install anti-lock braking systems on electric motorcycles and electric mopeds.

[0004] On a traditional motorcycle, power is provided by a mid-mounted gasoline engine and transmitted to the rear wheel through a chain, without other electrical components. If ABS is to be equipped, independent wheel speed sensors must be installed on the front and rear wheels, and corresponding gear rings must be installed on the brake disc to collect wheel speed signals. However, in an electric motorcycle, the rear wheel is a three-phase brushless hub motor with three Hall sensors. The output signal of the permanent magnet on the hub passing through the Hall sensor is output to the motor controller for speed and torque control.

[0005] When existing electric vehicle manufacturers install ABS, they still follow the motorcycle method and install independent Hall wheel speed sensors and induction gear rings for the rear wheels, without using the three Hall sensors that come with the rear wheel hub motor. Since the rear wheel hub motor of an electric motorcycle occupies a larger space than the rear wheel of a traditional motorcycle that only has a chain flywheel, the space left for the Hall wheel speed sensor and the induction gear ring is small, making installation difficult. The additionally installed Hall wheel speed sensor and induction gear ring will increase the cost of the entire vehicle. Therefore, the utility model provides a hub motor Hall to ABS wheel speed signal device to solve the problems raised in the above background technology. Utility Model Content

[0006] The utility model aims to provide a wheel hub motor Hall-type ABS wheel speed signal device, which utilizes the Hall voltage signal of the wheel hub motor of a two-wheeled electric vehicle to convert it into a 7mA to 14mA wheel speed current signal output by an ABS wheel speed sensor, thereby eliminating the wheel speed sensor and gear ring of the rear wheel.

[0007] To achieve the above object, a hub motor Hall to ABS wheel speed signal device is provided, which includes an ABS controller, a Hall wheel speed converter, a filter, an optocoupler, an operational amplifier, a constant current sampling resistor, a power triode, and a low dropout linear regulator. The Hall signal of the hub motor is filtered by the filter to remove the high-frequency AC components therein, and then drives the light-emitting diode inside the optocoupler and transmits the signal to the subsequent operational amplifier. The low dropout linear regulator is used to reduce the loop voltage to supply power to the operational amplifier. The operational amplifier, the power triode, and the constant current sampling resistor form a loop power supply current transmitter, and the operational amplifier can adjust the current in the series loop of the wheel speed sensor power supply and the wheel speed signal output according to the voltage bias transistor of the constant current sampling resistor.

[0008] According to the above-mentioned hub motor Hall to ABS wheel speed signal device, the ABS controller is connected to the Hall wheel speed converter through the original two wheel speed signal lines, and any one of the three Hall signals of the hub motor is connected to the Hall wheel speed converter together with the Hall signal return ground wire.

[0009] The utility model has the following beneficial effects:

[0010] 1. Compared with the prior art, this hub motor Hall to ABS wheel speed signal device utilizes the Hall sensor of the electric motorcycle rear wheel hub motor itself, and through the conversion of relevant control circuits, outputs a 7 mA - 14 mA current signal of the wheel speed sensor. Compared with the traditional ABS electrical architecture, it saves the cost of the rear wheel speed sensor and the toothed ring. And since the Hall sensor of the electric motorcycle rear wheel hub motor does not directly contact the external environment, there is no need to regularly clean the iron filings adsorbed on the sensor surface during driving like the traditional wheel speed sensor, which has the advantages of reducing the ABS installation cost and being maintenance-free in the later stage;

[0011] 2. Compared with the prior art, this hub motor Hall to ABS wheel speed signal device adopts a two-wire current source interface, which can be easily fully compatible with the wheel speed sensor interface of the existing ABS controller.

[0012] The additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further illustrates the utility model in conjunction with the drawings and embodiments;

[0014] Figure 1 It is a schematic electrical structure diagram of the Hall wheel speed signal of the hub motor Hall to ABS wheel speed signal device of the utility model;

[0015] Figure 2 This is a schematic diagram of the Hall wheel speed signal principle structure of a Hall-to-ABS wheel speed signal device for a wheel hub motor of the present utility model;

[0016] Figure 3 This is a schematic diagram of the electrical connection structure of a Hall wheel speed converter of a Hall-to-ABS wheel speed signal device for a wheel hub motor of the present utility model;

[0017] Legend Explanation:

[0018] 1. ABS controller; 2. Hall wheel speed converter; 3. Filter; 4. Optocoupler; 5. Operational amplifier; 6. Constant current sampling resistor; 7. Power triode; 8. Low dropout linear regulator. Specific Embodiment

[0019] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.

[0020] From the perspective of the signal flow direction, this device can be divided into two parts by the optocoupler 4: pre-stage filtering and post-stage signal processing.

[0021] Refer to Figures 1-3 , in an embodiment of a Hall-to-ABS wheel speed signal device for a wheel hub motor of the present utility model, it includes an ABS controller 1, a Hall wheel speed converter 2, a filter 3, an optocoupler 4, an operational amplifier 5, a constant current sampling resistor 6, a power triode 7, and a low dropout linear regulator 8. The Hall signal of the wheel hub motor is filtered by the filter 3 to remove the high-frequency AC components therein, and then drives the light-emitting diode inside the optocoupler 4, and transmits the signal to the post-stage operational amplifier 5. The low dropout linear regulator 8 is used to reduce the loop voltage, thereby powering the operational amplifier 5. The operational amplifier 5, the power triode 7, and the constant current sampling resistor 6 form a loop power supply current transmitter. The operational amplifier 5 can adjust the current in the series loop of the wheel speed sensor power supply and the wheel speed signal output according to the voltage bias transistor of the constant current sampling resistor 6.

[0022] Pre-stage filtering: After the Hall signal of the wheel hub motor is led out from the connector of the motor controller, it passes through the capacitor input π-type filter 3 to remove the high-frequency AC components therein, and then drives the light-emitting diode inside the linear optocoupler 4, and transmits the signal to the post-stage operational amplifier circuit. The optocoupler 4 functions as an isolation input signal circuit and a post-stage signal processing circuit.

[0023] Post-stage signal processing: The low-dropout linear regulator 8 can reduce the loop voltage to power the operational amplifier 5, and the active devices of the present device obtain power from the loop current. The loop-powered current transmitter is composed of the operational amplifier 5, the power triode 7, and the constant-current sampling resistor 6. The operational amplifier 5 biases the transistor according to the voltage of the constant-current sampling resistor 6 to adjust the current in the series loop of "wheel speed sensor power supply" and "wheel speed signal output".

[0024] To be compatible with the wheel speed signal processing circuit of the existing ABS controller 1 (ABS-ECU), the output signal required by this device is a current signal. When there is no voltage signal (low level) from the Hall of the rear-wheel hub motor of the electric motorcycle, the output constant current range is: 5.9 mA to 8.4 mA; when there is a voltage signal (high level) from the motor Hall, the output constant current range is: 11.8 mA to 16.8 mA.

[0025] The ABS controller 1 is connected to the Hall wheel speed converter 2 through the original two wheel speed signal lines, and any one of the three Hall signals of the hub motor is connected to the Hall wheel speed converter 2 together with the Hall signal return ground wire.

[0026] During installation, the original two wheel speed signal lines of the ABS controller 1 do not need to be modified and are directly connected to the Hall wheel speed converter 2. Any one of the three Hall signals of the hub motor is connected to the Hall wheel speed converter 2 together with the Hall signal return ground wire.

[0027] The wheel speed signal interface of the ABS controller 1 (ABS-ECU) adopts a two-wire 7-14 mA current loop. There are only two wires connected between the ABS controller 1 and the Hall wheel speed converter 2. This pair of wires is both a signal transmission line and a power supply line for the ABS controller 1 to supply power to the Hall wheel speed converter 2. This enables the present device to operate normally even at the minimum current of 5.9 mA, and this application is set to not more than 5 mA.

[0028] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the knowledge scope of those of ordinary skill in the art.

Claims

1. A hub motor Hall to ABS wheel speed signal device, characterized in that It includes an ABS controller (1), a Hall wheel speed converter (2), a filter (3), an optocoupler (4), an operational amplifier (5), a constant current sampling resistor (6), a power triode (7), and a low dropout linear regulator (8). The Hall signal of the hub motor passes through the filter (3) to filter out the high-frequency AC components therein, then drives the light-emitting diode inside the optocoupler (4), and transmits the signal to the subsequent operational amplifier (5). The low dropout linear regulator (8) is used to reduce the loop voltage so as to supply power to the operational amplifier (5). The operational amplifier (5), the power triode (7), and the constant current sampling resistor (6) form a loop power supply current transmitter. The operational amplifier (5) can adjust the current in the series loop of the wheel speed sensor power supply and the wheel speed signal output according to the voltage of the constant current sampling resistor (6) to bias the transistor.

2. The hub motor Hall to ABS wheel speed signal device according to claim 1, wherein, The ABS controller (1) is connected to the Hall wheel speed converter (2) through the original two wheel speed signal lines. Any one of the three Hall signals of the hub motor is connected to the Hall wheel speed converter (2) together with the Hall signal return ground wire.

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