Bicycle control system

Abstract

Bicycle control system (1) comprising a pressure relief device (10), a brake actuation sensor (20), a wheel speed sensor (30), a vehicle speed sensor (40), and a pressure relief control unit (50). The pressure relief device is designed to be connected to a brake lever (BL) and a brake caliper (BC) of a bicycle (B). The brake actuation sensor is designed to detect actuation of the brake lever. The wheel speed sensor is designed to detect the wheel speed of one wheel (FW) of the bicycle. The vehicle speed sensor is designed to detect the vehicle speed of the bicycle.The pressure relief control unit is separate from a valve (11) of the pressure relief device and communicates with the pressure relief device, the brake actuation sensor, the wheel speed sensor, and the vehicle speed sensor. The pressure relief control unit drives the pressure relief device to depressurize the brake caliper based on values ​​detected by the brake actuation sensor, the wheel speed sensor, and the vehicle speed sensor.

Description

Technical FieldThe disclosure relates to a bicycle control system.BackgroundToday, to increase the driving safety of bicycles, bicycles are equipped with anti-lock brake systems (ABS) to prevent locking of the wheels during braking. Generally, the housing of an ABS is provided not only with a flow channel and a movable valve element disposed in the flow channel, but also with an electronic control unit for controlling the movement of the valve element. Such a structural arrangement results in an overall bulky ABS, which has a negative effect on the aesthetic nature of the bicycle. Therefore, the manner in which the above problem is addressed is one of the issues in this area.SUMMARYThe disclosure provides a bicycle control system capable of addressing the problem that the overall size of the antilock brake system (ABS) is excessively large, thereby adversely affecting overall aestheticity of the bicycle.An embodiment of the disclosure provides a bicycle control system. The bicycle control system includes a pressure release device, a brake operation sensor, a wheel speed sensor, a vehicle speed sensor, and a pressure release control unit. The pressure relief device is configured to be connectable to a brake lever and a brake caliper of a bicycle. The brake operation sensor is configured to be capable of detecting an operation of the brake lever. The wheel speed sensor is configured to be capable of detecting a wheel speed of a wheel of the bicycle. The vehicle speed sensor is configured to be capable of detecting a vehicle speed of the bicycle. The pressure relief control unit is separate from a valve of the pressure relief device and is in signal communication with the pressure relief device, the brake actuation sensor, the wheel speed sensor, and the vehicle speed sensor. The pressure relief control unit drives the pressure relief device to depressurize the caliper based on values detected by the brake operation sensor, the wheel speed sensor, and the vehicle speed sensor.Another embodiment of the disclosure relates to a bicycle control system. The bicycle control system includes a pressure release device and a pressure release control unit. The pressure relief device is configured to be connectable to a brake lever and a brake caliper of a bicycle. The pressure relief device includes a first housing, and the first housing is disposed on a front fork tube of the bicycle. The pressure relief control unit includes a second housing, and the second housing is disposed at a position on the bicycle different from a position of the front fork tube.According to the bicycle control system as discussed in the above embodiments, the pressure relief control unit is disconnected from the valve of the pressure relief device and is in signal communication with the pressure relief device. With this configuration, the pressure relief device does not need to house the pressure relief control unit inside it. This can reduce the size of the pressure relief device, thereby avoiding a negative impact on the overall aesthetic of the bicycle.BRIEF DESCRIPTION OF THE DRAWINGSThe present disclosure will become more fully understood from the following detailed description and the accompanying drawings, which are given by way of illustration only and are therefore not intended to limit the present disclosure, wherein: FIG. 1 is a schematic view of a bicycle in connection with a bicycle control system according to the disclosure; FIG. 2 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a first embodiment of the disclosure; FIG. 3 is a schematic view of a pressure relief control unit, a bicycle system control unit, a circuit board, a chip, and a second housing in FIG. 1 ; FIG. 4 is a schematic view of a pressure relief control unit, a bicycle system control unit, a circuit board, two chips, and a second housing according to a second embodiment of the disclosure; FIG. 5 is a schematic view of a pressure relief control unit, a bicycle system control unit, two circuit boards, and two housings according to a third embodiment of the disclosure; FIG. 6 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a fourth embodiment of the disclosure; FIG. 7 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a fifth embodiment of the disclosure; FIG. 8 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a sixth embodiment of the disclosure; and FIG. 9 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a seventh embodiment of the disclosure.DETAILED DESCRIPTIONIn the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically illustrated to simplify the drawing.Moreover, the terms used in the present disclosure, such as technical and scientific terms, have their own meaning and are understood by those skilled in the art unless additionally defined in the present disclosure. That is, the terms used in the following paragraphs are to be understood as having a meaning common in the related fields, and will not be described in detail unless specifically defined in the present disclosure.First, it should be noted that in the block diagrams referenced below, a solid thin line connecting two components means that the two components are in electrical and / or signal communication via a physical cable. In particular, an electrical connection between two components via a physical cable means that power is transmitted between the two components through the physical cable, while a signal communication between two components via a physical cable means that signals are transmitted between the two components through the physical cable. In addition, a broken line connecting two components means that the two components are wirelessly connected in signal communication, i.e., signals are wirelessly transmitted between the two components. Moreover, a thick line connecting two components means that the two components are connected via an oil passage through which hydraulic oil pressure is transmitted between the two components.Referring to FIGS. 1, 2 to 3, a schematic view of a bicycle cooperating with a bicycle control system according to the disclosure is illustrated in FIG. 1, FIG. 2 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a first embodiment of the disclosure, and FIG. 3 is a schematic view of a pressure relief control unit, a bicycle system control unit, a circuit board, a chip, and a second housing in FIG. 1.In this embodiment, the bicycle control system 1 cooperates with, for example, a bicycle B, and the bicycle B may be, but is not limited to, a mountain bike. In other embodiments, the bicycle may be a road bicycle. The bicycle control system 1 includes a pressure release device 10, a brake operation sensor 20, a wheel speed sensor 30, a vehicle speed sensor 40, and a pressure release control unit 50.The pressure release device 10 is attached to, for example, a front fork tube F of the bicycle B. The pressure relief device 10 is configured to be connectable to a brake lever BL and a brake caliper BC of the bicycle B, the brake caliper BC being fixed to the front fork tube F by, for example, a brake caliper bracket. The pressure relief device 10 includes, for example, a first housing 14, a valve 11, a driver 12, and a control switch 13. The valve 11, the driver 12, and the control switch 13 are disposed in the first housing 14. The valve 11 may include a flow channel structure (not shown) and a valve element (not shown), wherein the valve element is made of a magnetically conductive material and the driver 12 is, for example, an electromagnetic coil. The driver 12 electromagnetically drives the valve element of the valve 11. The control switch 13 is electrically connected to the driver 12. The brake operation sensor 20 is, for example, a hydraulic pressure sensor, and may be disposed in the pressure relief device 10. The brake operation sensor 20 is configured to be capable of detecting a hydraulic pressure generated by the brake lever BL. Note that the brake operation sensor is not limited to a hydraulic pressure sensor. In other embodiments, the brake actuation sensor may be another type of sensor, such as a motion-triggered switch attached to the brake lever or a Hall sensor. The wheel speed sensor 30 is fixed to, for example, the caliper bracket and thus to the front fork tube F via the caliper bracket, and the wheel speed sensor 30 is configured to be capable of detecting a wheel speed of a front wheel FW of the bicycle B. The vehicle speed sensor 40 is configured to be capable of detecting a vehicle speed of the bicycle B, and may be fixed to, for example, a front body S of the bicycle B, but is not limited thereto. In other embodiments, the vehicle speed sensor may be attached to an upper tube UP or a lower tube LP of the bicycle frame.The pressure relief control unit 50 is separate from the valve 11 of the pressure relief device 10, which means that the pressure relief control unit 50 and the valve 11 of the pressure relief device 10 are not integrated into a single unit arranged at the same position on the bicycle B, but rather are formed as two separate units arranged at different positions on the bicycle B. For example, the pressure relief control unit 50 includes a second housing CB that may be fixed to the front frame S of the bicycle B, although this is not limiting. In other embodiments, the second housing of the pressure relief control unit may be fixed to the upper tube UP or the lower tube LP of the bicycle frame.In this embodiment, the aforementioned vehicle speed sensor 40 may be disposed in the second housing CB, for example. When the pressure release control unit 50, the vehicle speed sensor 40, and the pressure release device 10 are attached to the bicycle B, the pressure release control unit 50 and the vehicle speed sensor 40 are movable relative to the pressure release device 10. For example, a suspension SU is provided on the front fork tube F of the bicycle B, the second housing CB of the pressure release control unit 50 is disposed on the front body S, and the first housing 14 of the pressure release device 10 is disposed on the front fork tube F. Therefore, when the road surface is rough and the front fork pipe F moves by the suspension SU to absorb vibration, the pressure release device 10 moves on the front fork pipe F relative to the pressure release control unit 50 and the vehicle speed sensor 40 attached to the front body S. In another embodiment, in a state where the second housing CB of the pressure release control unit 50 is disposed on the upper tube UP or the lower tube LP of the bicycle frame, the pressure release device 10 moves on the front fork tube F relative to the pressure release control unit 50 and the vehicle speed sensor 40 attached to the upper tube UP or the lower tube LP when the front fork tube F of the bicycle B is steering.In this embodiment, the pressure relief control unit 50 is separated from the valve 11 of the pressure relief device 10 disposed on the front fork pipe F and instead is fixed to a part (e.g., the aforementioned front body S, the upper pipe UP, or the lower pipe LP) of the bicycle B that does not directly support the vibrations transmitted from the road surface. Thereby, vibrations transmitted from the front fork pipe F to the front body S, the upper pipe UP, or the lower pipe LP are passed through the suspension SU of the bicycle B, thereby more effectively preventing the vibrations from damaging the pressure relief control unit 50.In this embodiment, the vehicle speed sensor 40 is not limited to being disposed in the second housing CB. In other embodiments, the vehicle speed sensor may be disposed outside the second housing, but may be fixed to the front frame S, the upper pipe UP, or the lower pipe LP similarly to the second housing.The depressurization control unit 50 is in signal communication with the control switch 13 of the depressurization device 10, the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40.In this embodiment, the bicycle control system 1 may further include a hub motor 60, a bicycle system control unit 70, and a power supply unit 80.The hub motor 60 is fixed in a hub of a rear wheel RW of the bicycle B and is configured to drive the rear wheel RW in rotation, thereby providing power to the bicycle B to move forward. The bicycle system control unit 70 is in signal communication with the hub motor 60 and is configured to control the operation of the hub motor 60.As shown in FIG. 3, the pressure relief control unit 50 and the bicycle system control unit 70 are disposed in a same chip C on a same circuit board P, the circuit board P being disposed in, for example, the second housing CB.The power supply unit 80 may be disposed in the second housing CB or independently outside the second housing CB. The power supply unit 80 is electrically connected to the circuit board P and thus electrically connected to the bicycle system control unit 70 and the pressure release control unit 50 via the circuit board P, thereby providing power for the operation of the bicycle system control unit 70 and the pressure release control unit 50. In addition, the power supply unit 80 is also electrically connected to the control switch 13 of the pressure release device 10. The control switch 13 is a power switch configured to control whether the power supplied from the power supply unit 80 is supplied to the driver 12.In this embodiment, the pressure release control unit 50 controls the driver 12 of the pressure release device 10 based on the values detected by the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40, thereby driving the valve element of the valve 11 to depressurize the brake caliper BC. For example, when the value detected by the brake operation sensor 20 exceeds a preset threshold value, the depressurization control unit 50 may confirm that the bicycle B is in a braking state. The pressure relief control unit 50 can determine variations in the wheel speed and the vehicle speed based on the values detected by the wheel speed sensor 30 and the vehicle speed sensor 40, respectively, and make comprehensive judgments to evaluate the possibility of locking the wheels. Once the pressure relief control unit 50 determines that the wheel could lock, it sends a trigger signal to the control switch 13 of the pressure relief device 10, thereby providing the power supplied from the power supply unit 80 to the driver 12, whereby the driver 12 drives the valve element of the valve 11 to depressurize the caliper BC.In this embodiment, the pressure relief controller 50 is separate from the pressure relief device 10 and is in signal communication with the pressure relief device 10. This can reduce the size of the pressure relief device 10, thereby avoiding a negative impact on the overall aesthetic of the bicycle B.In this embodiment, the bicycle system control unit 70 and the pressure relief control unit 50 are disposed in the same chip C on the same circuit board P, but the disclosure is not limited thereto.For example, FIG. 4 is a schematic view of a pressure relief control unit, a bicycle system control unit, a circuit board, two chips, and a second housing according to a second embodiment of the disclosure. In this embodiment, a bicycle system control unit 70 dand a pressure release control unit 50 dare respectively disposed in two different chips C 1 and C 2 on the same circuit board P in the second housing CB.Referring to FIG. 5, FIG. 5 is a schematic view of a pressure relief control unit, a bicycle system control unit, two circuit boards, and two housings according to a third embodiment of the disclosure. In this embodiment, a bicycle system control unit 70 eand a pressure relief control unit 50 eare respectively disposed in chips C 1 and C 2 on two different circuit boards P 1 and P 2, and the circuit boards P 1 and P 2 are respectively disposed in two separate and independent housings B 1 and B 2, for example.Referring to FIG. 6, FIG. 6 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a fourth embodiment of the disclosure.The bicycle control system 1 aof this embodiment is similar to the bicycle control system 1 of the first embodiment. In the following, the differences between them will be described primarily, while similar parts can be referred to in the preceding paragraphs and will not be repeated below.In this embodiment, the bicycle control system 1 afurther includes a communication unit 90 a. The communication unit 90 amay be disposed on the pressure relief device 10 or may be separate from the pressure relief device 10. The communication unit 90 ais in signal communication with the control switch 13 of the pressure release device 10, the brake operation sensor 20, the wheel speed sensor 30, the vehicle speed sensor 40, and the pressure release control unit 50.In this embodiment, the values detected by the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40 are transmitted to the pressure release control unit 50 via the communication unit 90 a. When the pressure release control unit 50 determines that there is a possibility of locking the wheels based on the detected values from the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40, it sends a trigger signal to the communication unit 90 a. The communication unit 90 athen transmits the trigger signal to the control switch 13 of the pressure relief device 10, whereby the power supply unit 80 supplies power to the driver 12, whereby the valve element of the valve 11 is controlled to depressurize the caliper BC.Note that the bicycle system control unit 70 and the pressure relief control unit 50 in this embodiment are not limited to being disposed on the same chip C on the same circuit board P as shown in FIG. 3. In other embodiments, the bicycle system control unit and the pressure relief control unit may be arranged in different chips on the same circuit board as shown in FIG. 4, or may be arranged in chips on two different circuit boards, respectively, as shown in FIG. 5.Next, referring to FIG. 7, a block diagram of a bicycle control system, a brake lever, and a brake caliper according to a fifth embodiment of the disclosure is shown.The bicycle control system 1 bof this embodiment is similar to the bicycle control system 1 of the first embodiment. In the following, the differences between them will be described primarily, while similar parts can be referred to in the preceding paragraphs and will not be repeated below.In this embodiment, the bicycle control system 1 bincludes a first wireless communication unit 90 band a second wireless communication unit 95 b. The first wireless communication unit 90 bis, for example, but not limited to, disposed on the same circuit board as the pressure relief control unit 50 and in signal communication with the pressure relief control unit 50. the second wireless communication unit 95 bmay be disposed on the pressure relief device 10 or may be separate from the pressure relief device 10. The second wireless communication unit 95 bis in signal communication with the control switch 13 of the pressure release device 10.In addition, the bicycle control system 1 bmay include a first power supply unit 80 band a second power supply unit 85 b. The first power supply unit 80 bmay be disposed inside or outside the second housing CB. The first power supply unit 80 bis electrically connected to the bicycle system control unit 70 and the pressure release control unit 50 to provide power for operation thereof. The second power supply unit 85 bmay be disposed inside the pressure relief device 10 or independently disposed outside the pressure relief device 10. The second power supply unit 85 bis electrically connected to the control switch 13 of the pressure release device 10.In this embodiment, when the pressure release control unit 50 determines that there is a possibility of locking the wheels based on the values detected by the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40, it controls the first wireless communication unit 90 bto transmit a trigger signal to the second wireless communication unit 95 b. The second wireless communication unit 95 bthen sends the trigger signal to the control switch 13 of the pressure relief device 10, whereby the second power supply unit 85 bsupplied power to the driver 12 so that the driver 12 drives the valve element of the valve 11 to depressurize the brake caliper BC.Note that the bicycle system control unit 70 and the pressure relief control unit 50 in this embodiment are not limited to being disposed on the same chip C on the same circuit board P as shown in FIG. 3. In other embodiments, the bicycle system control unit and the pressure relief control unit may be arranged in different chips on the same circuit board as shown in FIG. 4, or may be arranged in chips on two different circuit boards, respectively, as shown in FIG. 5.Next, referring to FIG. 8, shown in FIG. 8 is a block diagram of a bicycle control system, a brake lever, and a brake caliper according to a sixth embodiment of the disclosure.The bicycle control system 1 cof this embodiment is similar to the bicycle control system 1 bof the fifth embodiment. The differences between them will be described primarily below, and the same parts in the above paragraphs may be referred to and not repeated below.In this embodiment, the second wireless communication unit 95 bis in signal communication with the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40. the values detected by the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40 can be wirelessly transmitted to the pressure release control unit 50 via the second wireless communication unit 95 band the first wireless communication unit 90 b.Note that the bicycle system control unit 70 and the pressure relief control unit 50 in this embodiment are not limited to being disposed on the same chip C on the same circuit board P as shown in FIG. 3. In other embodiments, the bicycle system control unit and the pressure relief control unit may be arranged in different chips on the same circuit board as shown in FIG. 4, or may be arranged in chips on two different circuit boards, respectively, as shown in FIG. 5.The above embodiments illustrate the pressure relief device 10 using the driver 12 as an electromagnetic coil and the valve element of the valve 11 made of a magnetically conductive material, but are not limited thereto. Referring to FIG. 9, FIG. 9 is a block diagram of a bicycle control system, a brake lever, and a caliper according to a seventh embodiment of the disclosure.The bicycle control system 1 fof this embodiment is similar to the bicycle control system 1 of the first embodiment. The differences between them will be described primarily in the following, and similar parts can be referred to in the preceding paragraphs and will not be repeated below.In this embodiment, a pressure relief device 10 fincludes a valve 11 f, a driver 12 f, a control switch 13 f, and a transmission component 14 f. The driver 12 fis, for example, a motor. The transmission component 14 fmay be a component that can transmit the power of the motor, for example, a rack. The transmission component 14 fis physically connected to the driver 12 fand the valve element of the valve 11 f, so that the driver 12 fcan drive the valve element of the valve 11 fby means of the transmission component 14 f.In this embodiment, when the pressure release control unit 50 determines that there is a possibility of locking the wheels based on the values detected by the brake operation sensor 20, the wheel speed sensor 30, and the vehicle speed sensor 40, it sends a trigger signal to the control switch 13 f. As a result, the energy provided by the power supply unit 80 can be supplied to the driver 12 f, as a result of which the driver 12 fcan actuate the valve element of the valve 11 fby means of the transmission component 14 f, in order to depressurize the brake caliper BC.In this embodiment, the bicycle control system 1 ffurther includes a position sensor 100 fthat is in signal communication with the pressure relief control unit 50. The position sensor 100 fis arranged, for example, within the pressure relief device 10 fand is configured such that it can detect the position of the valve element of the valve 11 f. In this way, the pressure relief control unit 50 can determine the degree of pressure relief provided to the caliper BC by the valve element of the valve 11 fbased on the position of the valve element. The pressure relief control unit 50 may then determine whether it is necessary to further drive the valve element of the valve 11 fto adjust the degree of pressure relief of the caliper BC, based on the aforementioned values.Note that the pressure relief device 10 fof this embodiment can be used as a substitute for the pressure relief devices in the aforementioned fourth, fifth, and sixth embodiments, and the position sensor 100 fcan be applied to the bicycle control systems of the fourth, fifth, and sixth embodiments, respectively.According to the bicycle control system as discussed in the above embodiments, the pressure release control unit is separate from the pressure release device and is in signal communication with the pressure release device. With this configuration, the pressure relief device does not need to house the pressure relief control unit inside it. This allows for a reduction in the size of the pressure relief device, thereby avoiding a negative impact on the overall aesthetic of the bicycle.It will be apparent to those skilled in the art that various modifications and variations of the present disclosure may be made. The specifications and examples are to be considered as exemplary embodiments only, with the scope of the disclosure being indicated by the following claims and their equivalents.

Claims

A bicycle control system (1, 1a, 1b, 1c, 1f) comprising: a pressure relief device (10, 10f) configured to be connectable to a brake lever (BL) and a brake caliper (BC) of a bicycle (B); a brake operation sensor (20) configured to be capable of detecting an operation of the brake lever; a wheel speed sensor (30) configured to be capable of detecting a wheel speed of a wheel (FW) of the bicycle; a vehicle speed sensor (40) configured to be capable of detecting a vehicle speed of the bicycle; and a pressure relief control unit (50, 50d, 50e) separated from a valve (11, 11f) of the pressure relief device and in signal communication with the pressure relief device, the brake operation sensor, the wheel speed sensor and the vehicle speed sensor, wherein the pressure relief control unit drives the pressure relief device to depressurize the caliper based on values detected by the brake operation sensor, the wheel speed sensor and the vehicle speed sensor.The bicycle control system according to claim 1, further comprising a bicycle system control unit (70, 70d) and a hub motor (60), wherein the bicycle system control unit is in signal communication with the hub motor and the bicycle system control unit and the pressure relief control unit (50, 50d) are disposed on a same circuit board (P).The bicycle control system according to claim 1, further comprising a bicycle system control unit (70e) and a hub motor (60), wherein the bicycle system control unit is in signal communication with the hub motor, and the bicycle system control unit and the pressure relief control unit (50e) are each disposed on two different circuit boards (P1, P2).The bicycle control system according to claim 2, wherein the bicycle system control unit (70) and the pressure relief control unit (50) are arranged in a same chip (C) on the same circuit board, or the bicycle system control unit (70d) and the pressure relief control unit (50d) are respectively arranged in two different chips (C1, C2) on the same circuit board.The bicycle control system (1, 1a, 1f) according to claim 2, further comprising a power supply unit (80), wherein the power supply unit is electrically connected to the bicycle system control unit, the pressure release control unit, and the pressure release device.The bicycle control system (1b, 1c) according to claim 2, further comprising a first power supply unit (80b) and a second power supply unit (85c), wherein the first power supply unit is electrically connected to the bicycle system control unit and the pressure release control unit, and the second power supply unit is electrically connected to the pressure release device (10).The bicycle control system (1b, 1c) according to claim 1, further comprising a first wireless communication unit (90b) and a second wireless communication unit (95b), wherein the first wireless communication unit is in signal communication with the depressurization control unit, the second wireless communication unit is in signal communication with the depressurization device (10), and the first wireless communication unit wirelessly communicates with the second wireless communication unit.The bicycle control system (1c) according to claim 7, wherein the second wireless communication unit is in signal communication with the brake operation sensor, the wheel speed sensor, and the vehicle speed sensor.The bicycle control system (1a) according to claim 1, further comprising a communication unit (90a), wherein the communication unit is in signal communication with the pressure release device (10), the brake operation sensor, the wheel speed sensor, the vehicle speed sensor, and the pressure release control unit.The bicycle control system (1, 1f) according to claim 1, wherein the pressure relief device comprises a driver (12, 12f), the driver is in signal communication with the pressure relief control unit, and the driver is configured to be operable to actuate the valve to depressurize the caliper.The bicycle control system (1) according to claim 10, wherein the driver (12) electromagnetically drives the valve (11).The bicycle control system (1f) according to claim 10, wherein the pressure relief device further comprises a transmission component (14f), the transmission component is physically connected to the driver (12f) and the valve (11f), and the driver drives the valve via the transmission component.The bicycle control system (1f) according to claim 10, further comprising a position sensor (100f), wherein the position sensor is in signal communication with the pressure relief control unit, and the position sensor is configured to be capable of detecting a position of the valve (11f).The bicycle control system according to claim 1, wherein when the pressure relief control unit and the pressure relief device are attached to the bicycle, the pressure relief control unit and the pressure relief device are movable relative to each other.A bicycle control system (1) comprising: a pressure relief device (10) configured to be connectable to a brake lever (BL) and a brake caliper (BC) of a bicycle (B), the pressure relief device comprising a first housing (14), and the first housing being disposed on a front fork tube (F) of the bicycle; and a pressure relief control unit (50) comprising a second housing (CB), the second housing being disposed on the bicycle at a position different from a position of the front fork tube.The bicycle control system according to claim 15, further comprising a vehicle speed sensor (40), wherein when the pressure release control unit, the vehicle speed sensor, and the pressure release device are attached to the bicycle, the pressure release control unit and the vehicle speed sensor are movable relative to the pressure release device.

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