• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL1040925A
    申请号:NL1040925
    申请日:2014-08-25
    公开日:2015-03-03
    发明作者:Min Sun；Xuping Zhu；Qiang Ding；Bishi Yang；Chun Jiang；Wei Li
    申请人:Min Sun；
    IPC主号:
    专利说明:

    ELECTRIC POWER-ASSISTED BICYCLE DRIVING SYSTEM CAPABLE OF RECOGNIZING STATE OF ROAD
    BACKGROUND
    Technical Field
    The present invention relates to an electric power-assisted bicycle driving system capable of recognizing a state of a road, and belongs to the field of a motor sensing control driving system of an electric power-assisted bicycle.
    Related Art
    In Europe Union and countries such as the United States, Canada, and Japan, it is stipulated by law that an electric power-assisted bicycle shall not be driven by electric power directly, and a motor shall not be directly started with a switch in the absence of human power; instead, a bicycle needs to be cycled with human power first, electric power is used to assist cycling only after the entire vehicle is started, and once cycling with human power stops, cycling with electric power also stops immediately.
    Currently, an electric power-assisted bicycle driving system generally determines whether an entire vehicle is started in two manners, where one is speed collection and the other is torque collection, and the two manners are described below: (1) Speed collection: A system collects, by using a speed sensor, whether an entire vehicle is started and a cycling speed, and then drives a motor in real time through computer operations, and pushes the bicycle forward to achieve an effect of assisted cycling.
    This manner has the advantages of low product cost, a reliable structure, and simple installation. The disadvantage is insufficient comfortableness for a cyclist, where when a vehicle is at an upslope, the vehicle cannot recognize the upslope, so that a large amount of human power is required for cycling at the upslope, making the cycling less comfortable. (2) Torque collection: A system uses a torque sensor to collect strength of pedaling by a cyclist during cycling with human power, and drives a motor in real time through computer operations, so that human power and electric power act together to achieve an effect of assisted cycling.
    This manner has the advantages of desirable comfortableness, real-time collection of the strength of cycling with human power, real-time adjustment of a driving power of a driving motor, and consistency between an assisting torque and the strength of pedaling during cycling with human power. The disadvantages are a complex structure, complex installation, and insufficient compatibility of installation, where a bicycle frame needs to be customized according to the size of the torque sensor, resulting in high production cost, insufficient reliability, high manufacturing requirement, and installation failures for special models.
    SUMMARY
    To solve the foregoing problems, the present invention discloses an electric power-assisted bicycle driving system capable of recognizing a state of a road, where the driving system uses a gradient sensing apparatus and a cadence sensing apparatus, so that the system can recognize whether an electric power-assisted bicycle is in a state of an upslope, a downslope or a level road, and then uses a logic control system and a motor driving system, so that a motor outputs different torques in different states, thereby finally keeping a cyclist in an effortless and comfortable state.
    The electric power-assisted bicycle driving system has low production cost and desirable cycling comfortableness. A defect that a speed sensor cannot recognize an upslope is solved and the defects of a complex structure, complex installation, and high production cost of a torque sensor are solved.
    BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of a control relationship according to the present invention; and FIG. 2 is a schematic diagram of a human-computer interaction interface according to the present invention.
    DETAILED DESCRIPTION
    The present invention is further described below with reference to the accompanying drawings and specific implementation manners.
    It can be seen with reference to FIG. 1 that, the electric power-assisted bicycle driving system capable of recognizing a state of a road includes a brake control unit, a cadence sensing unit, a gradient sensing unit, a human-computer interaction interface, a logic control unit, a motor driving unit, a motor, and an assistance ratio regulating unit, where the brake control unit, the cadence sensing unit, and the gradient sensing unit are separately connected to the logic control unit, the logic control unit is connected to the motor driving unit, the assistance ratio regulating unit, and the human-computer interaction interface separately, the motor is connected to both the motor driving unit and the assistance ratio regulating unit, and the assistance ratio regulating unit is also connected to the human-computer interaction interface; and the human-computer interaction interface and the logic control unit are in a mutual feedback connection, and the assistance ratio regulating unit and the human-computer interaction interface are in a mutual feedback connection.
    For the brake control unit, a brake switch is installed on a brake lever in case a cyclist needs to stop or slow the bicycle and a brake may occur. Once a brake occurs, the logic control unit immediately receives a signal transmitted by the brake switch, and in this case, determines that the cyclist wants to brake, and immediately stops an output of the motor at this time, so that a torque output of the motor becomes zero and the motor stops driving.
    The cadence sensing unit is installed fixedly on a pedal crank of a vehicle and can generate a cadence signal and transmit the cadence signal to the logic control unit. Once the cyclist cycles an electric power-assisted bicycle with human power, that is, as long as the cyclist pedals the pedal crank of the vehicle with feet, the apparatus can output the cadence signal, and after receiving the cadence signal, the logic control unit analyzes whether the vehicle is being cycled or is stopped and a pedaling speed when cycling.
    The gradient sensing unit uses a gravitational level sensing apparatus, which is a 360°*360° level sensor and is installable at any position of the vehicle. When the vehicle is at a slope, the vehicle must be in an inclined state, and in this case, the gravitational level sensing apparatus is used to output an inclination angle of the vehicle, and output an inclination angle signal to the logic control unit. The gradient sensing unit is simple and small in structure and can be placed in any space larger than 2 cm*2 cm, and is connected to the logic control unit through a wire.
    After receiving the signal output by the cadence sensing unit and the signal output by the gradient sensing unit, the logic control unit first determines whether the vehicle is being cycled; if a cadence sensing signal is received, the logic control unit learns that the vehicle is started with human power, detects a gradient sensing signal, and in this case, determines whether the vehicle is at a slope. If the vehicle is at a level road, the logic control unit drives a rotational speed of the motor by using the motor driving unit and according to a cycling speed; if the vehicle is at an upslope, the logic control unit calculates a slope gradient, and increases an output torque of the motor by using the motor driving unit, so as to enable the vehicle to climb the upslope; and if the vehicle is at a downslope, the logic control unit stops, by using the motor driving unit, the torque output of the motor and drives the vehicle to slide along the downslope.
    The human-computer interaction interface includes a liquid crystal display and multiple control buttons, the liquid crystal display is capable of displaying a travelling speed, travelling mileage, a system output current (power), supply power, an assistance ratio state, and system failure detection. A display interface shown in FIG. 2 outputs, by using the logic control unit, data required by the human-computer interaction interface, where the data includes: a travelling speed, mileage, an output power of a motor, battery remaining power, and various failure codes, so that a cyclist can clearly learn a current electrical state of the vehicle. The cyclist can regulate a system assistance ratio according to a physical strength state by using the control button arranged on the human-computer interaction interface, so that the cyclist stays in an excellent physical strength state, or if the cyclist intends to cycle mainly with human power and using assistance of some electric power, the cyclist can regulate an assistance ratio to a low shift. In this case, the human-computer interaction interface sends an instruction to the assistance ratio regulating unit, and the assistance ratio regulating unit outputs, according to a preset driving ftmction, a corresponding driving mode by using the logic control unit, and keeps, by means of the motor driving unit, an output of the motor in a low power consumption state, so as to prolong a cycling distance of the entire vehicle. In contrast, when the cyclist lacks physical strength and intends to mostly rely on the assistance of electric power, the cyclist can regulate an assistance ratio to a high shift, and in this case, the human-computer interaction interface sends an instruction to the assistance ratio regulating unit, and the assistance ratio regulating unit outputs, according to a preset driving function, a corresponding driving mode by using the logic control unit, and keeps, by means of the motor driving unit, an output of the motor in a high power consumption and high torque state, so that the human power consumption of the cyclist is reduced.
    The motor driving unit is an apparatus for executing various instructions of the logic control unit, and converts the instruction of the logic control unit into various physical states such a current, a voltage or a torque of the motor.
    The assistance ratio regulating unit stores and calls various different driving functions, collects in real time a running state such as a speed, a voltage or a current of the motor, receives an assistance ratio instruction signal transmitted by the human-computer interaction interface, and then sends, according to the real-time state of the motor and by using a driving function, a driving instruction to the logic control unit, and the logic control unit drives, by using motor driving unit, the motor to output a corresponding torque.
    The motor is a final output mechanism of the system, and all instructions collected by the logic control unit need to be converted into torques by the motor. The motor receives, from the motor driving unit, physical quantities about a current, a voltage, and a rotating speed, and also feeds back real-time data about the current, voltage, and rotating speed to the assistance ratio regulating unit. After collecting real-time data of the motor, the assistance ratio regulating unit compares the real-time data with the driving function, and then sends a regulating instruction to the logic control unit. After the logic control unit drives the motor by using the motor driving unit, the assistance ratio regulating unit then collects a running parameter of the motor until the running parameter of the motor meets an assistance ratio requirement of the assistance ratio regulating unit.
    The implementation methods of the present invention are introduced in detail below.
    Before an entire vehicle is started, a power supply is turned on, the entire vehicle is powered on, and the system is in a standby state.
    Embodiment 1: Brake state A logic control unit detects at the same time whether a brake control unit, a cadence sensing unit, and a gradient sensing unit has a signal, respectively. If it is detected that the brake control unit has a brake signal, no matter whether the cadence sensing unit or the gradient sensing unit has a signal or not, the logic control unit outputs a stop instruction to a motor driving unit, and a motor cannot rotate.
    Embodiment 2: Static state
    If a logic control unit detects that a brake control unit has no brake signal and a cadence sensing unit has no speed signal, no matter whether a gradient sensing unit has a signal or not, the logic control unit considers that there is no start intention for a vehicle. In this case, the logic control unit outputs a stop instruction to a motor driving unit, and a motor cannot rotate.
    Embodiment 3: Level road cycling
    If a logic control unit detects that a cadence sensing unit has a signal, a brake control unit has no signal, and a gradient sensing unit has a signal, the logic control unit obtains through calculation that a gradient is zero, which indicates that a vehicle is started with human power and is travelling on a level road. In this case, the logic control unit calls a defaulted standard driving function, and drives a motor by using a motor driving unit to generate a torque to make the entire vehicle in assisted cycling. The motor collects in real time, by using the logic control unit, a cadence signal sent by the cadence sensing unit, determines a driving parameter required by the motor; and at the same time, the assistance ratio regulating unit feeds back a real-time state of the motor to the logic control unit to determine whether the state of the motor reaches a required state.
    Embodiment 4: Upslope cycling
    In a cycling process, a logic control unit monitors signal changes of a cadence sensing unit, a gradient sensing unit, and a brake control unit in real time. If the cadence sensing unit has a signal and the gradient sensing unit has a signal, it indicates that a gradient of a road changes in the cycling process of a vehicle, and then the logic control unit determines whether the vehicle is at an upslope or a downslope. If the vehicle is at an upslope, when the upslope is calculated by using a standard driving function, a motor outputs a torque increment, and the logic control unit drives the motor by using a motor driving unit and further adjusts the torque increment. An assistance ratio regulating unit collects a state of the motor in real time, after the collection, compares the state of the motor and a parameter of the standard driving function, and determines whether the specified parameter is reached. If the parameter is not reached, the logic control unit sends an instruction to the motor driving unit to perform micro-adjustment, and the assistance ratio regulating unit collects the state of the motor again to form a state feedback mechanism for the motor and perform real-time adjustment to make a cyclist feel comfortable with the assistance.
    Embodiment 5: Downslope cycling
    In a cycling process, a logic control unit monitors signal changes of a cadence sensing unit, a gradient sensing unit, and a brake control unit in real time. If the cadence sensing unit has a signal and the gradient sensing unit has a signal, it indicates that a gradient of a road changes in the cycling process of a vehicle, and then the logic control unit determines whether the vehicle is at an upslope or a downslope. If the vehicle is at a downslope, it can be known by using a standard driving function that a system turns of a motor when the vehicle is at the downslope, and keeps the vehicle in a sliding state.
    Embodiment 6: Application of human-computer interaction
    In a real-time cycling state of a vehicle, a physical strength state of a cyclist changes constantly, so that the cyclist needs to be capable of regulating a system driving mode to adapt to changes of physical strength of the cyclist. The present invention provides a standard driving function, which is suitable for cycling experience of most people in a normal state. When the cyclist feels very tired and expects to exert less human power with a motor providing a larger torque, the cyclist sends an instruction by using a control button on a human-computer interaction interface. After receiving a regulating instruction, an assistance ratio regulating unit compares the regulating instruction and the standard driving function, sends an instruction of strengthening or weakening driving to a logic control unit, then constantly monitors in real time whether the motor achieves an objective of regulation, and sends or feeds back a micro-adjustment instruction to the logic control unit to perform closed-loop control.
    The human-computer interaction interface also receives real-time information from the logic control unit, where the real-time information includes kilometers per hour of a vehicle, cycling mileage, real-time power consumption, failure detection codes, system remaining power, and the like, for a cyclist to view in real time.
    The human-computer interaction interface can further send a shutdown instruction to the logic control unit. When the cyclist does not need assistance of an electric power-assisted system, the cyclist can send a shutdown instruction by using a control button on the human-computer interaction interface, and when the logic control unit receives the shutdown instruction sent by the human-computer interaction interface, an entire assistance system is turned off and energy consumption is lowered.
    The technical means disclosed in the solutions of the present invention is not limited to the technical means disclosed in the foregoing technical solutions, and further includes technical solutions formed by any combinations of the foregoing technical features.
    权利要求:
    Claims (8)
    [1]
    1. An electrically driven bicycle control system that can recognize a state of a road surface consisting of a brake control, a cadence sensor, a slope sensor, an interface for human-computer interaction, a logic control unit, a motor drive unit, a motor, and a regulating unit for auxiliary ratio, wherein the brake control, the cadence sensor, and the slope sensor are separately connected to the logic control unit, the logic control unit is connected to the motor drive unit, the auxiliary ratio regulating unit, and the human-computer interaction interface are separately connected, the motor is connected to both the motor drive unit and the auxiliary ratio regulating unit, and the auxiliary ratio regulating unit is also connected to the human-computer interaction interface.
    [2]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 1, wherein the human-computer interaction interface and the logic control unit have a mutual feedback connection, and the auxiliary ratio regulating unit and the human-interface interface. computer interaction have a connection with mutual feedback.
    [3]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 1, wherein the cadence sensor is fixed on the pedal of a vehicle, and is capable of generating a cadence signal and of transmitting a cadence signal to the logic control unit.
    [4]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 1, wherein the slope sensor uses a slope sensitive sensor with a device that detects a gravity slope of 360 ° * 360 °, and which can be installed anywhere on the vehicle .
    [5]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 1 or 2 or 3 or 4, wherein upon receipt of a cadence signal, the logic control unit receives a signal from the slope sensor and determines whether the vehicle is on a slope is located; if the vehicle is on a flat road, the logic control unit drives the rotation speed of the motor by using the motor drive unit based on the bicycle speed; if the vehicle is on a slope, the logic control unit calculates the slope, increases the torque of the motor using the motor drive unit, and pushes the vehicle forward to climb the slope; and if the vehicle is on a downhill slope, the logic control unit stops the torque output from the motor by using the motor drive unit and causes the vehicle to slide down the slope.
    [6]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 5, wherein the human-computer interaction interface consists of an LCD screen and more than one control button, the LCD screen the travel speed, travel kilometers, output current, power supply , an auxiliary ratio state and a system error detection of the device can display, and a control button cycle is connected to the auxiliary ratio regulating unit.
    [7]
    An electrically driven bicycle control system that can recognize a state of a road surface according to claim 5, wherein the motor drive unit follows an instruction of the logic control unit and converts the instruction of the logic control unit into a current or voltage in the drive motor.
    [8]
    An electrically driven bicycle control system capable of recognizing a state of a road surface according to claim 7, wherein the auxiliary ratio regulating unit collects a state of the engine in real time when the engine is running, receives a signal with an auxiliary ratio instruction from the interface for human-computer interaction, and sends a drive instruction to the logic control unit based on the real-time state of the motor, and the logic control unit drives the motor through the motor drive unit to generate a corresponding torque.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201310387079|2013-08-30|
    CN201310387079.3A|CN103434604B|2013-08-30|2013-08-30|A kind of electric assisted bicycle drive system that can identify pavement state|
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