Detection device and vehicle

Abstract

The utility model provides a detection device and a vehicle. The detection device comprises a mounting part, a detection circuit, a moving part and a driving part. The mounting part is an insulating part and is provided with a cavity; at least part of the moving part is located in the cavity and connected with the brake pad, and the moving part can move along with the brake pad. The driving piece is located in the cavity and used for driving the moving part to move in the direction close to the brake pad. The detection circuit comprises a power supply, a detection member, a first resistor and a connection terminal. The detection member is used for detecting the current of the detection circuit. One of the first resistor and the connecting terminal which are electrically connected is connected with the moving part and moves along with the moving part, and the other one is fixed with the mounting part. When the moving part moves relative to the mounting part, the resistance value of the first resistor connected to the detection circuit can be changed. The detection member detects the current of the detection circuit and calculates the movement distance of the moving part according to the current. Through the design, the thickness of the brake pad can be detected, a user can conveniently replace the brake pad in time, and safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a detection device and a vehicle. BACKGROUND

[0002] The brake pad is an important part of the vehicle braking system. When the vehicle brakes, the brake pad contacts the brake disc to slow down the vehicle. During use, the brake pad will wear out, resulting in a decrease in thickness. The remaining effective wear thickness of the brake pad is an important factor for the vehicle to exhibit normal braking system performance. When the brake pad wears out severely, it will affect the braking performance of the vehicle, easily leading to traffic accidents, and there is a great safety hazard. Therefore, the user needs to regularly maintain the brake pad and replace the severely worn brake pad in time. However, the brake pad is a non-external part of the vehicle, and it is difficult to measure the effective wear thickness of the brake pad without disassembling the chassis. CONTENT OF THE UTILITY MODEL

[0003] The embodiment of the present application provides a detection device and a vehicle, which are used for detecting the wear degree of a brake pad.

[0004] The embodiment of the present application provides a detection device, which is used for detecting the wear degree of a brake pad. The detection device comprises:

[0005] A mounting portion, which is an insulating piece and has a cavity;

[0006] A detection circuit;

[0007] A moving portion, at least a part of which is located in the cavity. The moving portion is used for being connected with the brake pad and being capable of moving with the brake pad relative to the mounting portion;

[0008] A driving piece, which is located in the cavity and connected with the mounting portion and the moving portion, and is used for driving the moving portion to move in a direction close to the brake pad;

[0009] The detection circuit comprises a power supply, a detection piece, a first resistor and a connection terminal. The detection piece is used for detecting the current of the detection circuit. One of the first resistor and the connection terminal is connected with the moving portion, and the other is fixed with the mounting portion. The first resistor and the connection terminal can be electrically connected.

[0010] When the moving portion moves with the brake pad relative to the mounting portion, the position of the connection terminal electrically connected with the first resistor can be changed, so as to change the resistance value of the first resistor connected into the detection circuit.

[0011] The scheme provided by the embodiments of the present application can calculate the wear condition of the brake pad by detecting the current in the detection circuit, can detect the movement distance of the brake pad each time the brake is applied, can obtain the remaining thickness of the brake pad through the movement distance of the brake pad, and can further obtain the wear degree of the brake pad. Such a design can detect the wear degree of the brake pad in real time, which is beneficial to improve the safety of driving. Meanwhile, the detection device and the brake pad are relatively independent components, and the moving part does not need to be embedded in the brake pad. Therefore, the structure of the brake pad does not need to be changed, which can reduce the influence on the production process of the brake pad. When replacing, only the brake pad needs to be replaced, and the detection device can be reused, which is beneficial to save costs and is more in line with actual use requirements.

[0012] In a possible implementation, one end of the first resistor is connected with the driving member, and the other end is connected with the moving part, and the connection terminal is fixed with the mounting part.

[0013] Such a design can drive the moving part to move by driving the first resistor through the driving member. Since the driving member directly drives the first resistor to move, the stability and movement precision of the first resistor can be improved, so that the first resistor can move when the moving part moves, thereby changing the relative position between the first resistor and the connection terminal to change the current of the detection circuit.

[0014] In a possible implementation, along the movement direction of the moving part, the end of the first resistor away from the moving part is electrically connected with the power supply.

[0015] When the moving part moves in the direction close to the brake pad, the resistance of the part of the first resistor connected to the detection circuit decreases.

[0016] Such a design can change the current of the detection circuit when the moving part moves. Since the resistance of the part of the first resistor connected to the detection circuit decreases, the current of the detection circuit increases. Such a design can reduce the difficulty of detecting the current by the detection member, which is beneficial to improve the detection precision, so that the detection result is more accurate and more in line with actual use requirements.

[0017] In a possible implementation, the connection terminal is embedded in the side wall of the cavity.

[0018] Such a design can improve the stability of the fixed arrangement of the connection terminal on the mounting part, reduce the possibility of movement of the connection terminal relative to the mounting part, and reduce the possibility of displacement of the connection terminal affecting the detection precision.

[0019] In a possible implementation, the connecting terminal is flush with an inner surface of a side wall of the cavity, and the first resistor is capable of sliding along the inner surface and capable of contacting the connecting terminal.

[0020] The connecting terminal flush with the inner wall of the cavity can reduce the possibility that the connecting terminal affects the movement of the first resistor. When the connecting terminal is protruded relative to the inner wall of the cavity, the first resistor in contact with the connecting terminal during movement has a tendency to move towards the brake pad, which causes stress concentration at the connection position of the connecting terminal and the inner wall of the cavity, resulting in breakage or damage of the connecting terminal and affecting the use of the detection device. The first resistor sliding along the inner wall of the cavity can guide the movement of the first resistor through the cavity, improve the stability of the movement of the first resistor, and thus improve the detection accuracy.

[0021] In a possible implementation, the detection circuit further comprises an insulating portion, which is located on a side of the first resistor away from the moving portion.

[0022] As the brake pad wears, the displacement of the brake pad gradually increases during braking, and the movement distance of the moving portion and the first resistor also increases. When the thickness of the brake pad is worn to a preset thickness, the first resistor moves to the insulating portion to contact the connecting terminal, and the detection circuit is disconnected. At this time, the user can be reminded by the controller of the vehicle or the like that the brake pad needs to be replaced. Such a design can determine whether the brake pad needs to be replaced by detecting whether the detection circuit is disconnected, which is conducive to improving the safety of the vehicle and more in line with actual use requirements.

[0023] In a possible implementation, the wear thickness L of the brake pad satisfies: wherein L is the wear thickness of the brake pad, U is the voltage of the detection circuit, S is the cross-sectional area of the first resistor, P is the resistivity of the first resistor, I1 is the initial current, and I2 is the current, the initial current is the current in the detection circuit when the brake pad contacts the brake disc before the brake pad wears, and the current is the current in the detection circuit when the current brake pad contacts the brake disc.

[0024] The wear of the brake pad can be calculated by the formula, so as to obtain the wear thickness of the brake pad.

[0025] In a possible implementation, one end of the connecting terminal is connected to the driving member, and the other end is connected to the moving portion, and the first resistor is fixed to the moving portion.

[0026] Through the design, the connecting terminal can be driven to move when the moving part moves, so as to change the relative position of the first resistor and the connecting terminal, change the resistance of the part of the detection circuit to which the first resistor is connected, and thus detect the wear degree of the brake pad according to the change of the current.

[0027] In a possible implementation, the driving member is an elastic member in a compressed state.

[0028] The elastic member in the compressed state can directly or indirectly apply a restoring force to the moving part, so that the moving part has a tendency to move in the direction close to the brake pad. When the brake pad moves in the direction close to the brake disc, the moving part can move in the direction close to the brake disc together with the brake pad under the action of the restoring force of the elastic member. The elastic member has the advantages of simple structure and low cost, and is more in line with actual use requirements.

[0029] In a possible implementation, the mounting part has an opening for the moving part to extend out, and the detection device further includes a sealing member configured to seal the opening, and the moving part can extend out through the sealing member.

[0030] The sealing member is configured to seal the cavity of the mounting part, so as to reduce the possibility of dust and other sundries entering the cavity, thereby reducing the influence of the sundries on the detection device and reducing the possibility that the sundries entering the cavity causes the detection circuit to fail to work normally.

[0031] Embodiments of the present application provide a vehicle, which comprises:

[0032] A brake disc;

[0033] A brake pad, which is capable of moving in the direction close to or away from the brake disc;

[0034] A detection device, which is connected with the brake pad and is configured to detect the wear degree of the brake pad.

[0035] In a possible implementation, the detection device is any one of the detection devices described above.

[0036] In a possible implementation, the side of the brake pad away from the brake disc abuts against the moving part of the detection device.

[0037] When the brake pad moves in the direction close to the brake disc and the brake pad contacts the brake disc, the brake pad can have displacement in other directions in addition to the displacement in the thickness direction of the brake pad, for example, displacement perpendicular to the thickness direction of the brake pad. Therefore, when the moving part is fixedly connected with the brake pad, the brake pad can drive the moving part to have corresponding displacement, so that the moving part shakes, and thus the first resistor or the connecting terminal connected with the moving part shakes, which affects the detection accuracy.

[0038] In a possible implementation, when the brake pad moves towards the brake disc, the driving member of the detection device is configured to drive the moving part to move with the brake pad, so as to change the resistance value of the first circuit connected in the detection circuit, and the detection member in the detection circuit is configured to detect the current of the detection circuit and calculate the movement distance of the moving part according to the current, so as to calculate the wear degree of the brake pad through the movement distance of the moving part.

[0039] Through the design, the wear condition of the brake pad can be obtained in real time, and the user can know the remaining service life of the brake pad, so that the brake pad can be replaced in time when the brake pad is seriously worn, and the safety hazard is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 A schematic view of a first embodiment of a detection device provided by an embodiment of the present application;

[0041] Figure 2 A schematic view of the first embodiment of the detection device provided by the embodiment of the present application after wear;

[0042] Figure 3 A schematic view of a second embodiment of a detection device provided by an embodiment of the present application in a first state;

[0043] Figure 4 A schematic view of the second embodiment of the detection device provided by the embodiment of the present application in a second state;

[0044] Figure 5 A schematic view of the second embodiment of the detection device provided by the embodiment of the present application in a third state;

[0045] Figure 6 A schematic view of a third embodiment of a detection device provided by an embodiment of the present application;

[0046] Figure 7 A relationship diagram of the wear amount of a brake pad and a current provided by an embodiment of the present application;

[0047] Figure 8 A schematic view of a fourth embodiment of a detection device provided by an embodiment of the present application.

[0048] REFERENCE SIGNS

[0049] 1- mounting part, 11- cavity, 12- sealing member;

[0050] 2- detection circuit, 21- power supply, 22- detection member, 23- first resistance, 24- connection terminal, 25- insulating part, 26- second resistance;

[0051] 3 - moving part; 4 - driving member; 5 - brake pad, 51 - fixed part, 52 - body part; 6 - brake disc; 7 - wear sensor. DETAILED DESCRIPTION

[0052] The brake pad is an important part of the vehicle braking system. When the vehicle brakes, the brake pad contacts the brake disc to slow down the vehicle. During use, the brake pad will wear out, resulting in a decrease in thickness. The remaining effective wear thickness of the brake pad is an important factor for the vehicle to exhibit normal braking system performance. When the brake pad wears out seriously, it will affect the braking performance of the vehicle, easily leading to traffic accidents, and there is a great safety hazard. Therefore, the user needs to regularly overhaul the brake pad and replace the seriously worn brake pad in time. However, the brake pad is a non-external part of the vehicle, and it is difficult to measure the effective wear thickness of the brake pad without disassembling the chassis.

[0053] In view of this, the embodiments of the present application provide a detection device for detecting the wear degree of the brake pad, so that the user can replace the brake pad in time and improve the safety of the vehicle.

[0054] As shown in Figure 1 In a possible implementation, the detection device includes a wear sensor 7 embedded in the interior of the brake pad 5. As shown in Figure 2 When the brake pad 5 is in use, the wear sensor 7 can wear out with the brake pad 5, so the wear degree of the wear sensor 7 is the same as that of the brake pad 5. The controller in communication connection with the wear sensor 7 can obtain the wear degree of the brake pad 5 according to the detection result of the wear sensor 7. In actual use, a threshold range can be set for the wear degree of the brake pad 5, for example, the controller can calculate the remaining effective wear thickness of the brake pad 5 from the detection data of the wear sensor 7. When the remaining effective wear thickness of the brake pad 5 is less than the preset thickness or reaches the corresponding threshold range, the controller can send a signal to remind the user to replace the brake pad 5.

[0055] Such a design can detect the wear degree of the brake pad 5 in real time, so that the user can obtain the wear degree of the brake pad 5 in time, and can replace the brake pad 5 in time according to the demand, so as to improve the safety of driving.

[0056] Such a design requires embedding the wear sensor 7 into the inside of the brake pad 5, which has certain requirements for the production process of the brake pad 5, and needs to change the process of the brake pad 5. At the same time, it is difficult to embed the wear sensor 7 into the brake pad 5, which will increase the production cost and lead to the reduction of production efficiency. Since the wear sensor 7 is embedded in the inside of the brake pad 5, when the brake pad 5 is replaced, the wear sensor 7 will be removed with the old brake pad 5, and when the new brake pad 5 is installed, the wear sensor 7 in the new brake pad 5 needs to be connected with the controller. Such a design not only increases the cost of the brake pad 5, but also increases the disassembly steps of the brake pad 5, leading to the reduction of the replacement efficiency of the brake pad 5. The wear degree of the wear sensor 7 and the wear degree of the brake pad 5 may have certain differences, which affects the accuracy of the detection result. Since the wear sensor 7 needs to be embedded in the brake pad 5 and contact and wear with the brake disc 6 together with the brake pad 5, the wear sensor 7 will occupy the effective wear space of the brake pad 5, affecting the braking performance of the brake pad 5. When replacing the brake pad 5, the old wear sensor 7 needs to be removed from the corresponding circuit, and the new wear sensor 7 needs to be connected to the corresponding circuit. Frequent disassembly will lead to the reduction of the connection stability of the wear sensor 7 and the controller, thereby affecting the accuracy of the detection device and existing safety hazards.

[0057] As Figure 3As shown, the embodiment of the present application provides a detection device, which comprises a mounting part 1, a detection circuit 2, a moving part 3 and a driving part 4. The mounting part 1 is an insulating part and has a cavity 11. At least part of the moving part 3 is located in the cavity 11 and is used to be connected with the brake pad 5, the connection mode comprises direct connection and indirect connection, the moving part 3 and the brake pad 5 can be relatively fixedly connected and can be abutted and the like. When the brake pad 5 moves, the moving part 3 can move with the brake pad 5. The driving part 4 is located in the cavity 11, and the driving part 4 is connected with the mounting part 1 and the moving part 3 and is used to drive the moving part 3 to move in the direction close to the brake pad 5. The detection circuit 2 comprises a power supply 21, a detection part 23, a first resistor 23 and a connection terminal 24, and the detection part 23 is used to detect the current of the detection circuit 2. One of the first resistor 23 and the connection terminal 24 is connected with the moving part 3 and can move with the moving part 3, and the other is fixed with the mounting part 1, and the first resistor 23 and the connection terminal 24 can be electrically connected, at the same time, one of the first resistor 23 and the connection terminal 24 is electrically connected with the positive pole of the power supply, and the other is electrically connected with the negative pole of the power supply, so that the detection circuit 2 forms a loop. When the moving part 3 moves relative to the mounting part 1 with the brake pad 5, the moving part 3 can drive the first resistor 23 or the connection terminal 24 connected with the moving part 3 to move, so that the position of the connection terminal 24 electrically connected with the first resistor 23 can be changed, the length of the first resistor 23 connected into the detection circuit 2 is changed, and thus the resistance value of the first resistor 23 connected into the detection circuit 2 can be changed, so that the current of the detection circuit 2 is changed. The detection part 23 can detect the current of the detection circuit 2 and calculate the movement distance of the moving part 3 according to the current. As shown in the figure, Figure 4 and Figure 5 As shown, when the brake pad 5 is worn, the thickness of the brake pad 5 becomes thin, the distance between the brake pad 5 and the brake disc 6 increases, and when braking, the brake pad 5 needs to increase the stroke to make the brake pad 5 contact with the brake disc 6. Therefore, since the moving part 3 moves with the brake pad 5, the movement distance of the moving part 3 can be obtained by detecting the current change in the detection circuit 2, and then the movement distance of the brake pad 5 is obtained, and the wear degree of the brake pad 5 can be calculated according to the movement distance of the brake pad 5, when the wear of the brake pad 5 reaches the preset threshold range, the user can be reminded to replace the brake pad 5 in time.

[0058] The scheme provided by the embodiments of the present application can calculate the wear condition of the brake pad 5 by detecting the current in the detection circuit 2, can detect the movement distance of the brake pad 5 each time the brake is applied, and obtain the remaining thickness of the brake pad 5 through the movement distance of the brake pad 5, and then obtain the wear degree of the brake pad 5. Such a design can detect the wear degree of the brake pad 5 in real time, which is beneficial to improve the safety of driving. Meanwhile, the detection device and the brake pad 5 are relatively independent components, and the moving part 3 does not need to be embedded in the brake pad 5, so the structure of the brake pad 5 does not need to be changed, which can reduce the influence on the production process of the brake pad 5. When replacing, only the brake pad 5 needs to be replaced, and the detection device can be reused, which is beneficial to save costs and more in line with actual use requirements.

[0059] As shown in Figure 3 In a possible implementation, one end of the first resistor 23 is connected with the driving member 4, the other end is connected with the moving part 3, and the connection terminal 24 is fixed with the mounting part 1.

[0060] Such a design can drive the moving part 3 to move by driving the first resistor 23 through the driving member 4. Since the driving member 4 directly drives the first resistor 23 to move, the stability and movement precision of the first resistor 23 can be improved, so as to move the first resistor 23 when the moving part 3 moves, thereby changing the relative position between the first resistor 23 and the connection terminal 24 to change the current of the detection circuit 2.

[0061] As shown in Figure 3 In a possible implementation, along the movement direction of the moving part 3, the end of the first circuit away from the moving part 3 is electrically connected with the power supply 21. When the moving part 3 moves in the direction close to the brake pad 5, the resistance of the part of the first resistor 23 connected into the detection circuit 2 decreases.

[0062] Such a design can change the current of the detection circuit 2 when the moving part 3 moves. Since the resistance of the part of the first resistor 23 connected into the detection circuit 2 decreases, the current of the detection circuit 2 increases. Such a design can reduce the difficulty of detecting the current by the detection member 23, which is beneficial to improve the detection precision, so that the detection result is more accurate and more in line with actual use requirements.

[0063] As shown in Figure 3 In a possible implementation, the connection terminal 24 is embedded in the inner wall of the cavity 11.

[0064] Such a design can improve the stability of the fixed arrangement of the connection terminal 24 in the mounting part 1, reduce the possibility of movement of the connection terminal 24 relative to the mounting part 1, and reduce the possibility of displacement of the connection terminal 24 affecting the detection precision.

[0065] AsFigure 3 As shown, in one possible implementation, the connecting terminal 24 is flush with the inner wall of the cavity 11, and the first resistor 23 is capable of sliding along the inner wall and capable of contacting the connecting terminal 24 to form an electrical connection.

[0066] The connecting terminal 24 flush with the inner wall of the cavity 11 can reduce the possibility that the connecting terminal 24 affects the movement of the first resistor 23. When the connecting terminal 24 is protruded relative to the inner wall of the cavity 11, the first resistor 23, when moving, contacts the connecting terminal 24, which causes the portion of the connecting terminal 24 protruded relative to the cavity 11 to have a tendency to move towards the brake pad 5, resulting in stress concentration at the connection position of the connecting terminal 24 and the inner wall of the cavity 11, which causes the connecting terminal 24 to break or be damaged, and further affects the use of the detection device. The first resistor 23 sliding along the inner wall of the cavity 11 can guide the movement of the first resistor 23 by the cavity 11, which improves the stability of the movement of the first resistor 23, and thus improves the detection accuracy.

[0067] The moving part 3 can have a first position and a second position. When the moving part 3 is in the first position, the brake pad 5 is in an initial position. When the moving part 3 is in the second position, the brake pad 5 is in a working state, i.e., the brake pad 5 contacts the brake disc 6. The moving part 3 can move in a direction close to the brake pad 5 to move from the first position to the second position. The first resistor 23 is located at one end of the moving part 3 away from the brake pad 5, and the end of the first resistor 23 away from the moving part 3 is used to be electrically connected to the power supply 21. The connecting terminal 24 can be arranged at the end of the first resistor 23 close to the moving part 3 when the moving part 3 is in the first position. The connecting terminal 24 and the first resistor 23 can be used to form a structure similar to a sliding rheostat. When the first resistor 23 moves, the resistance of the detection circuit 2 changes. When the brake pad 5 is in the initial position, along the length direction of the first resistor 23, the portion between the end of the first resistor 23 away from the moving part 3 and the connecting terminal 24 is connected to the detection circuit 2. When the brake pad 5 is in use, as the brake pad 5 moves towards the brake disc 6, the driving part 4 drives the moving part 3 to move with the brake pad 5, and the first resistor 23 can move with the moving part 3, so that the end of the first resistor 23 connected to the power supply 21 gradually approaches the connecting terminal 24. The distance between the end of the first resistor 23 connected to the power supply 21 and the connecting terminal 24 decreases, which causes the portion of the first resistor 23 connected to the detection circuit 2 to gradually decrease, the resistance in the detection circuit 2 decreases, and the current increases. According to the change of the current, the movement distance of the brake pad 5 can be obtained, and the wear degree of the brake pad 5 can be obtained through the change of the movement distance of the brake pad 5, so as to detect the wear degree of the brake pad 5 in real time.

[0068] As Figure 6As shown, in a possible implementation, the detection circuit 2 further includes an insulation portion 25 located on the side of the first resistor 23 away from the moving portion 3.

[0069] As the brake pad 5 wears, the displacement of the brake pad 5 gradually increases during braking, and the movement distance of the moving portion 3 and the first resistor 23 also increases. When the thickness of the brake pad 5 wears to a preset thickness, the first resistor 23 moves to contact the insulation portion 25 and the connecting terminal 24, and the detection circuit 2 is disconnected. At this time, the user can be reminded by the controller or the like of the vehicle that the brake pad 5 needs to be replaced. Such a design can determine whether the brake pad 5 needs to be replaced by detecting whether the detection circuit 2 is disconnected, which is conducive to improving the safety of the vehicle and is more in line with actual use requirements.

[0070] In use, the wear of the brake pad 5 can be detected in real time by the detection circuit 2. Different threshold ranges can be set according to requirements, for example, each threshold range can correspond to a smaller wear degree of the brake pad 5, a larger wear degree of the brake pad 5, and the brake pad 5 needing to be replaced, etc. When the wear degree of the brake pad 5 is smaller, the user can not be prompted, when the wear degree of the brake pad 5 is larger, the user can be reminded by a prompt light or the like, and the user can choose whether to replace the brake pad 5 according to his own needs. When the brake pad 5 is severely worn, the user can be reminded that the brake pad 5 has worn close to the limit and needs to be replaced in a timely manner.

[0071] In a possible implementation, the wear thickness of the brake pad 5 is L, and L satisfies wherein L is the wear thickness of the brake pad 5, U is the voltage of the detection circuit 2, S is the cross-sectional area of the first resistor 23, P is the resistivity of the first resistor 23, I1 is the initial current, and I2 is the current. When the brake pad 5 is not worn, the distance between the brake pad 5 at the initial position and the brake disc 6 is L1. After the brake pad 5 is worn, the distance between the brake pad 5 at the initial position and the brake pad 5 is L2, and L = L2 - L1. Since the movement distance of the first resistor 23 is equal to the movement distance of the moving portion 3, which is equal to the movement distance of the brake pad 5, the difference between the length of the part of the first resistor 23 connected to the detection circuit 2 after the brake pad 5 is worn and the length of the part of the first resistor 23 connected to the detection circuit 2 before the brake pad 5 is worn is equal to the wear thickness of the brake pad 5. Therefore, the change in the length of the part of the first resistor 23 connected to the detection circuit 2 is also L. Before the brake pad 5 is worn, when the brake pad 5 is in contact with the brake pad 5, the resistance of the detection circuit 2 is R1, and the current of the detection circuit 2 is the initial current I1. After the brake pad 5 is worn, when the brake pad 5 is in contact with the brake disc 6, the resistance of the detection circuit 2 is R2, and the current of the detection circuit 2 is the current I2. The difference between R1 and R2 is the resistance change r of the first resistor 23. The voltage of the power supply 21, the initial current, and the current are known quantities, so the resistance change r of the first resistor 23 can be calculated according to Ohm's law. According to the formula for resistance... The length of that part of the resistor can be calculated from r, therefore, combined with... and It can be calculated This allows us to draw, for example Figure 7 The curve shown, Figure 7 The horizontal axis represents the wear of brake pad 5, and the vertical axis represents the current I2. Therefore, the wear of brake pad 5 can be obtained based on the current current.

[0072] The wear amount of brake pad 5 can be calculated using this formula, thereby obtaining the wear thickness of brake pad 5.

[0073] like Figure 8 As shown, in one possible embodiment, one end of the connecting terminal 24 is connected to the driving member 4, and the other end is connected to the moving part 3. The first resistor 23 is fixed to the mounting part 1.

[0074] With this design, the moving part 3 can move the connecting terminal 24, thereby changing the relative position of the first resistor 23 and the connecting terminal 24, so that the resistance of the part of the first resistor 23 connected to the detection circuit 2 changes, thereby enabling the detection of the wear degree of the brake pad 5 based on the change of current.

[0075] like Figure 3 As shown, in one possible implementation, the driving member 4 is an elastic member in a compressed state. The elastic member can be a spring, torsion spring, elastic arm, or other elastic structure. A compression spring can be used as the driving member 4.

[0076] The elastic element in a compressed state can apply a restoring force directly or indirectly to the moving part 3, causing the moving part 3 to tend to move towards the brake pad 5. When the brake pad 5 moves towards the brake disc 6, the moving part 3 can move along with the brake pad 5 towards the brake disc 6 under the restoring force of the elastic element. The elastic element has the advantages of simple structure and low cost, and is more in line with actual usage needs.

[0077] After braking is completed, the brake pad 5 can move away from the brake disc 6 and drive the moving part 3 to move, so that the elastic element is compressed and the moving part 3 returns to its original position.

[0078] like Figure 3 As shown, in one possible embodiment, the mounting part 1 has an opening for the movable part 3 to extend out, and the detection device further includes a seal 12 for sealing the opening, through which the movable part 3 can extend out.

[0079] The sealing member 12 is used to seal the cavity 11 of the mounting portion 1, so as to reduce the possibility of dust and other sundries entering the cavity 11, thereby reducing the influence of the sundries on the detection device and reducing the possibility that the detection circuit 2 cannot work normally due to the sundries entering the cavity 11.

[0080] Compared with the scheme of setting a mechanical alarm or a wear sensor, the structure of the detection device provided by the embodiment of the application is simpler, and the thickness of the brake pad 5 can be detected in real time. The detection circuit 2 can be connected with a display device such as an instrument panel, so as to facilitate reminding the user. The working principle of the mechanical alarm is that when the brake pad 5 reaches the alarm thickness, the iron sheet of the mechanical alarm contacts the brake disc 6 during braking, and a scraping sound is generated to prompt the user. However, with the improvement of the sound insulation effect of the vehicle, the scraping sound is not easy to be recognized by the user, and there is a safety hazard. Moreover, the iron sheet scrapes the brake disc 6, which is easy to cause damage to the brake disc 6, and therefore, the service life of the brake disc 6 is affected and the maintenance cost is increased. The scheme of embedding the friction sensor 7 in the brake pad 5 can only provide feedback when the brake pad 5 reaches a certain thickness, and cannot reflect the remaining thickness of the brake pad 5 in real time. Moreover, when the brake pad 5 is replaced, the wear sensor 7 needs to be replaced together with the brake pad 5, which increases the maintenance cost.

[0081] The detection device provided by the embodiments of the present application can be used to detect the thickness of the brake pad 5 in real time. The thickness of the brake pad 5 is calculated according to the current in the detection circuit 2, and the thickness of the brake pad 5 can be displayed in real time on the instrument panel of the vehicle. When the remaining thickness of the brake pad 5 reaches the set threshold range, the user can be reminded to replace the brake pad 5 through the warning light and other ways, thereby improving the braking safety of the vehicle. The detection device can be powered by an external circuit, that is, the power supply 21 in the detection circuit 2 can share the same power supply 21 with other components or devices of the vehicle. The detection device can interact with the user through the display device. The mounting portion 1 can be fixed to the brake caliper for protecting the internal structure. The connecting terminal 24 can be a component such as an electric brush for electrical connection. The sealing element 12 can be used to prevent impurities, water vapor and the like from entering the cavity 11, thereby reducing the possibility that impurities and water vapor affect the normal use of the detection device. The material of the moving portion 3 is insulating and wear-resistant, and the moving portion 3 can be pushed to the brake pad 5 by the compression spring. The connecting terminal 24 can be fixedly arranged on the mounting portion 1, and the first resistor 23 is connected with the moving portion 3, so that the first resistor 23 and the moving portion 3 can move with the brake pad 5. As the brake pad 5 wears, the movement distance of the first resistor 23 and the moving portion 3 increases, which causes the resistance value of the part of the first resistor 23 connected to the detection circuit 2 to change, thereby causing the current in the detection circuit 2 to change. By comparing the current in the detection circuit 2 with the calibration value in the storage medium, the remaining thickness of the brake pad 5 can be obtained and displayed in the vehicle system. When the current reaches the warning value, it indicates that the brake pad 5 is about to reach the wear limit, and the user can be reminded to replace it in time through the instrument display warning light. When the brake pad 5 is replaced, the detection device can continue to be retained, thereby reducing the maintenance cost. The remaining life of the brake pad 5 can be clearly obtained by the user through real-time detection and display of the current on the brake pad 5, so that the user can arrange the maintenance time. The warning thickness of different brake pads 5 is different, and the corresponding threshold value can be adjusted according to the needs during use, so that the detection device can be adapted to different brake pads 5, and the application range is wider.

[0082] Based on the vehicle involved in each of the above embodiments, the embodiments of the present application also provide a vehicle. The vehicle includes a brake disc 6, a brake pad 5 and a detection device. The brake pad 5 can move in a direction close to or away from the brake disc 6. The detection device is connected with the brake pad 5 and is used to detect the wear degree of the brake pad 5. The detection device can be any of the detection devices involved in the above embodiments. Since the detection device has the above technical effects, the vehicle including the detection device also has corresponding technical effects, which will not be repeated here.

[0083] The vehicle machine system can be in communication connection with the detection member 23, for obtaining the detection result of the detection member 23 and displaying, so as to obtain the service life of the brake pad 5 by the user, and when the brake pad 5 is seriously worn, the user can be prompted to replace the brake pad 5. The storage medium can be used to store the corresponding algorithm and program, for calculating the wear degree of the brake pad 5 according to the detection result of the detection member 23. The detection circuit 2 can further include a second resistor 26, which can be connected into the detection circuit 2 as a protection circuit.

[0084] In a possible implementation, the side of the brake pad 5 away from the brake disc 6 is in abutment with the moving part 3.

[0085] When the brake pad 5 moves towards the brake disc 6 and the brake pad 5 contacts the brake disc 6, the brake pad 5 can have displacement in other directions in addition to the displacement in the thickness direction of the brake pad 5, for example, displacement perpendicular to the thickness direction of the brake pad 5. Therefore, when the moving part 3 is fixedly connected with the brake pad 5, the brake pad 5 will drive the moving part 3 to produce corresponding displacement, so that the moving part 3 shakes, and then the first resistor 23 or the connection terminal 24 connected with the moving part 3 shakes, which affects the detection accuracy.

[0086] The brake pad 5 can include a fixed part 51 and a body part 52, the fixed part 51 is located on the side of the body part 52 away from the brake disc 6, and the body part 52 is used to contact the brake disc 6 for braking, and the moving part 3 can be in abutment with the fixed part 51.

[0087] When braking, the brake pad 5 can move towards the brake disc 6, and the driving member 4 can drive the moving part 3 to move with the brake pad 5. Therefore, when the brake disc 6 contacts the brake disc 6, in the thickness direction of the brake pad 5, the movement distance of the moving part 3 is the same as the movement distance of the brake pad 5. The movement of the moving part 3 can change the relative position of the connection terminal 24 and the first resistor 23, so as to change the resistance value of the part of the first resistor 23 connected into the detection circuit 2, which causes the current of the detection circuit 2 to change. The detection member 23 can detect the current in the detection circuit 2, and calculate the movement distance of the moving part 3 according to the current, so as to calculate the wear degree of the brake pad 5 according to the movement distance of the moving part 3.

[0088] Through such design, the wear condition of the brake pad can be obtained in real time, the user can conveniently know the remaining service life of the brake pad 5, so as to replace the brake pad 5 in time when the brake pad 5 is seriously worn, and the safety hidden danger is reduced.

Claims

1. A detection device for detecting the degree of wear of a brake pad (5), characterized in that, The detection device comprises: a mounting portion (1) which is an insulating member and has a cavity (11); a detection circuit (2); a moving portion (3) which is located at least partially in the cavity (11) and is used to connect with a brake pad and move with the brake pad (5) relative to the mounting portion (1); a driving member (4) which is located in the cavity (11) and is connected with the mounting portion (1) and the moving portion (3) and used to drive the moving portion (3) to move in a direction close to the brake pad (5); wherein the detection circuit (2) comprises a power supply (21), a detection member (22) used to detect a current of the detection circuit (2), a first resistor (23) and a connection terminal (24), one of the first resistor (23) and the connection terminal (24) is connected with the moving portion (3), and the other is fixed with the mounting portion (1), and the first resistor (23) and the connection terminal (24) can be electrically connected; when the moving portion (3) moves with the brake pad (5) relative to the mounting portion (1), a position where the connection terminal (24) is electrically connected with the first resistor (23) can change, so as to change a resistance value of the first resistor (23) connected into the detection circuit (2).

2. The detection device of claim 1, wherein, One end of the first resistor (23) is connected with the driving member (4), and the other end is connected with the moving portion (3), and the connection terminal (24) is fixed with the mounting portion (1).

3. The detection device of claim 2, wherein, In the moving direction of the moving portion (3), one end of the first resistor (23) away from the moving portion (3) is electrically connected with the power supply (21); when the moving portion (3) moves in the direction close to the brake pad (5), the resistance of the part of the first resistor (23) connected into the detection circuit (2) decreases.

4. The detection device of claim 2, wherein, The connection terminal (24) is embedded in the side wall of the cavity (11).

5. The detection device of claim 4, wherein, The connection terminal (24) is flush with the inner surface of the side wall of the cavity (11), the first resistor (23) can slide along the inner surface and can be in contact with the connection terminal (24).

6. The detection device of claim 2, wherein, The detection circuit (2) further comprises an insulating portion (25) located on the side of the first resistor (23) away from the moving portion (3).

7. The detection device of claim 2, wherein, The wear thickness L of the brake pad (5) satisfies: Wherein, L is the wear thickness of the brake pad (5), U is the voltage of the detection circuit (2), S is the cross-sectional area of the first resistor (23), P is the resistivity of the first resistor (23), I1 is the initial current, I2 is the current, the initial current is the current in the detection circuit (2) when the brake pad (5) contacts the brake disc (6) before the brake pad (5) wears, and the current is the current in the detection circuit (2) when the brake pad (5) contacts the brake disc (6) at present.

8. The detection device of claim 1, wherein, One end of the connection terminal (24) is connected with the driving member (4), and the other end is connected with the moving portion (3), and the first resistor (23) is fixed with the moving portion (3).

9. The detection device according to any one of claims 1 to 8, characterized in that, The driving member (4) is an elastic member in a compressed state.

10. The detection device according to any one of claims 1 to 8, characterized in that, The mounting portion (1) has an opening for the moving portion (3) to extend out, and the detection device further comprises a sealing member (12) used to block the opening, and the moving portion (3) can extend out through the sealing member (12).

11. A vehicle characterized by comprising: The vehicle comprises: a brake disc (6); a brake pad (5) which can move in a direction close to or away from the brake disc (6); A detection device is connected with the brake pad (5) for detecting the wear degree of the brake pad (5). The detection device is the detection device according to any one of claims 1 to 10.

12. The vehicle of claim 11, wherein, The side of the brake pad (5) away from the brake disc (6) is in abutment with the moving part (3) of the detection device.

13. The vehicle of any one of claims 11-12, characterized by, When the brake pad (5) moves towards the brake disc (6), the driving part (4) of the detection device is used to drive the moving part (3) to move with the brake pad (5), so as to change the resistance value of the first circuit (23) connected in the detection circuit (2), and the detection part (22) in the detection circuit (2) is used to detect the current of the detection circuit (2) and calculate the movement distance of the moving part (3) according to the current, so as to calculate the wear degree of the brake pad (5) through the movement distance of the moving part (3).

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