CN210391110U - Brake pad filler block thickness detection device - Google Patents
Brake pad filler block thickness detection device Download PDFInfo
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- CN210391110U CN210391110U CN201921497835.7U CN201921497835U CN210391110U CN 210391110 U CN210391110 U CN 210391110U CN 201921497835 U CN201921497835 U CN 201921497835U CN 210391110 U CN210391110 U CN 210391110U
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Abstract
The embodiment of the application provides a brake pad thickness detection device, which relates to the technical field of automobiles and comprises a detector, a judger and a controller, wherein the detector is used for detecting high-level pulse data corresponding to the brake pad thickness; the judger is connected with the detector and is used for acquiring judgment result data whether the high-level pulse data is effective or not; the controller is connected with the detector and the judger and used for calculating according to the high-level pulse data to obtain the thickness of the brake pad and outputting the thickness of the brake pad and the state of the brake pad according to the judgment result data. By implementing the implementation structure, the thickness of the pad of the brake pad can be detected in real time in a non-braking state, error measurement in a braking state is avoided, complex operation of traditional detection can be avoided, and detection efficiency is improved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a brake pad thickness detection device.
Background
In a vehicle braking system, a brake pad is a very critical part, the state of the brake pad plays a decisive role in the quality of the braking effect, and the quality of the braking effect is related to the life safety of automobile drivers and passengers. It follows that the detection of the brake pads is a very important part of the automotive testing. In current brake pad testing processes, the thickness of the brake pad is typically tested. However, the thickness of the brake pad is currently detected every time the vehicle runs for a certain number of kilometers (for example, 5000 kilometers) under the normal running condition of the vehicle, but due to the design of the hub, the thickness of the brake pad cannot be directly seen by naked eyes of a part of vehicles, the thickness of the brake pad can be detected only by disassembling the tire, the labor hour and cost for each disassembling and detecting inevitably increase the cost of the vehicle, and the thickness of the brake pad cannot be effectively detected in real time and accurately. Therefore, the current detection means still has the situations of complicated operation and low efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide a brake pad lining block thickness detection device for realize carrying out real-time detection's purpose to brake pad lining block thickness, can also avoid the numerous and diverse operation that traditional detected simultaneously, improve detection efficiency.
An embodiment of the present application provides a brake pad thickness detecting apparatus including a detector, a determiner, and a controller, wherein,
the detector is used for detecting high-level pulse data corresponding to the thickness of the brake pad;
the judger is connected with the detector and is used for acquiring judgment result data whether the high-level pulse data is valid or not;
the controller is connected with the detector and the judger and used for calculating according to the high-level pulse data to obtain the thickness of the brake pad and outputting the thickness of the brake pad according to the judgment result data.
In the above implementation structure, the brake pad thickness detection apparatus may detect high-level pulse data corresponding to a thickness of a brake pad through the detector, and determine whether a current vehicle is in a braking state through the determiner, the determiner outputs determination result data of whether the vehicle is in the braking state, the controller obtains the high-level pulse data and the determination result data, and when the determination result data is 1, the high-level pulse data is valid, and the brake pad thickness is calculated according to pulse width information of the high-level pulse data. It can be seen that, use foretell brake block thickness detection device, can detect at any time at the vehicle in-process of marcing to the numerous and diverse operation of parking detection and testing process in the tradition has been avoided, uses the device to detect simultaneously, can also reduce the time that tradition detected, thereby improves detection efficiency.
Further, the detector includes a sensor assembly, a first switch, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first voltage comparator, wherein,
the first switch is a single-pole double-throw electronic switch; the positive input end of the first switch is connected with the controller; the negative input end of the first switch is grounded; the second output end of the first switch is connected with one end of the first resistor; the first switch is used for performing switch control according to the control signal sent by the controller;
one end of the sensor assembly is connected with the third output end of the first switch and is used for detecting capacitance data corresponding to the thickness of a pad of the brake pad, and the capacitance data is used for forming high-level pulse data; the other end of the sensor component is grounded;
the non-inverting end of the first voltage comparator is connected with the first output end of the first switch, one end of the second resistor and the judger; the inverting end of the first voltage comparator is connected with one end of the third resistor and one end of the fourth resistor; the output end of the first voltage comparator is connected with the controller;
the other end of the second resistor is connected with the other end of the sensor component;
the other end of the third resistor is connected with the other end of the first resistor;
the other end of the fourth resistor is connected with the other end of the sensor component.
In the implementation structure, it can be known that the detector comprises seven components, namely a sensor component, a first switch, a first resistor, a second resistor, a third resistor, a fourth resistor and a first voltage comparator, and from a functional perspective, the sensor component can detect capacitance data corresponding to the thickness of the brake pad lining block, the capacitance data is positively correlated with the real-time thickness of the brake pad lining block, and after the detection starts, the capacitance data changes along with the change of the real-time thickness of the brake pad lining block, and the change is converted into high-level pulse data through a circuit so as to be acquired by the controller; in addition, the first switch is used for controlling the starting and closing of detection, when the second output end and the third output end of the first switch are connected, the sensor assembly is used for acquiring capacitance data corresponding to the thickness of the brake pad lining, when the first output end and the third output end of the first switch are connected, the sensor assembly is used for testing and acquiring the thickness of the brake pad lining, namely the first switch is used for controlling the starting and closing of the detection (or the process called data conversion); and finally, the first voltage comparator is used for converting according to the capacitance data to obtain high-level pulse data. Therefore, by using the brake pad thickness detection device, the dynamic detection of the thickness of the brake pad can be completed through the structure of a circuit, and the additional load caused by a complex structure is avoided.
Further, the sensor assembly includes a capacitive sensor and a brake switch, wherein,
one end of the brake switch is connected with the third output end of the first switch, the other end of the brake switch is grounded, and the brake switch is used for performing switch control according to a braking state;
the capacitance sensor is connected with the brake switch in parallel and used for detecting capacitance data corresponding to the thickness of the brake pad.
In the above implementation structure, the sensor assembly includes a capacitance sensor and a brake switch, wherein the capacitance sensor is used for acquiring capacitance data corresponding to the thickness of the pad of the brake pad, and the brake switch is used for ensuring that the capacitance sensor operates based on a normal operation state, i.e., normal detection in a non-braking state. However, in practice, it is found that the brake switch may be a physical brake switch, that is, a switch existing in a physical form in a circuit. When the capacitive sensor is in a braking state in the use process, the capacitive sensor can contact a conductive plate due to braking so as to enable the capacitive sensor to be invalid, and therefore the conductive plate is the actual physical form of the brake switch; in practice, therefore, the brake switch may be present in the detection circuit, or may be present in practice to perform a corresponding function, which is not limited in any way.
Further, a power supply end of the first voltage comparator, the other end of the third resistor, and the other end of the first resistor are commonly connected to a power supply.
In the above implementation structure, the power supply terminal of the first voltage comparator, the other end of the third resistor, and the other end of the first resistor are connected and commonly connected to the input power supply, so as to obtain the input of the power supply and ensure the normal operation of the circuit.
Further, a ground terminal of the first voltage comparator, the other end of the second resistor, the other end of the fourth resistor, and the other end of the sensor module are commonly grounded.
In the above implementation structure, the ground terminal of the first voltage comparator, the other end of the second resistor, the other end of the fourth resistor, and the other end of the sensor module are connected, and common ground, the structure can ensure that the ground terminals are at a consistent level and at a low level.
Further, the determiner includes a fifth resistor, a sixth resistor, a not gate, a two-input nor gate and a second voltage comparator, wherein,
the non-inverting end of the second voltage comparator is connected with the detector; the reverse end of the second voltage comparator is connected with one end of the fifth resistor and one end of the sixth resistor; the output end of the second voltage comparator is connected with the input end of the NOT gate;
the first input end of the two-input NOR gate is connected with the detector; the second input end of the two-input NOR gate is connected with the output end of the NOR gate; the output end of the two-input NOR gate is connected with the control end;
the other end of the fifth resistor is connected with the detector;
the other end of the sixth resistor is connected with the detector.
In the implementation structure, the determiner is composed of five components of a fifth resistor, a sixth resistor, a not gate, a two-input nor gate and a second voltage comparator, in the using process of the structure, the input nor gate is used as a final output component, the output result of the component is used for representing determination result data, 1 is a normal test, 0 is an abnormal test, specifically, when the determination result data is 1, the device obtains and outputs the thickness of the pad of the brake pad, and when the determination result data is 0, the device does not output any data because the obtained data is invalid; wherein, the above 1 indicates that the data is valid and the brake pad is not in the braking state; the above 0 indicates that the data is invalid and the brake pad is in a braking state. It can be seen that the use of the above-described brake pad thickness detection apparatus enables output of determination result data to be ensured through the configuration of the circuit, thereby making the result of the brake pad thickness effective.
Further, the controller is a single-chip microcomputer.
In the implementation structure, the calculation capability of the MCU (single chip microcomputer) can ensure that the calculation efficiency of the thickness of the brake pad is better and the accuracy is higher.
Further, the brake pad thickness detecting apparatus further includes a power converter, wherein,
one end of the power converter is connected with the vehicle-mounted power supply, and the other end of the power converter is connected with the detector, the judger and the controller and used for supplying power to the detector, the judger and the controller.
In the implementation structure, the power converter can be compatible with any detection condition, and can supply power through the vehicle-mounted power supply in the vehicle-mounted process, so that the thickness of the pad of the brake pad in the driving process can be detected at any time.
Further, the brake pad thickness detecting apparatus further includes a display, wherein,
the display is connected with the controller and used for displaying the thickness of the brake pad lining block.
In above-mentioned implementation structure, brake block car thickness can be come out by direct display, and the user of being convenient for watches.
Further, the display comprises a display control circuit and a display component, wherein,
the display control circuit is connected with the controller;
the display component is connected with the display control circuit and used for displaying the thickness of the brake pad.
In the above implementation structure, the display module may be a liquid crystal display or an LED display screen, and whatever display module is controlled by the display control circuit. The display control circuit may be a circuit having a control chip. Therefore, the display has a high compatible space, and the compatible space of the brake pad thickness detection device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a brake pad thickness detection device according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another brake pad thickness detecting apparatus according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of another brake pad thickness detecting apparatus according to an embodiment of the present disclosure;
FIG. 4 is a schematic circuit diagram of a brake pad thickness detecting apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of a power converter in a brake pad thickness detection apparatus according to an embodiment of the present disclosure.
Description of the main element symbols:
100-a detector; s1-a first switch; r1-a first resistance; r2-a second resistance; r3-a third resistance; r4-a fourth resistance; a CS-sensor assembly; cX-a capacitive sensor; s2-a brake switch; a1 — first voltage comparator; 200-a judger; r5-a fifth resistance; r6-a sixth resistance; g1-a not gate; g2-a two input nor gate; a2 — second voltage comparator; 300-a controller; 400-power converter; 500-a display; 510-display component, 520-display control circuit.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like, indicate an orientation or positional relationship based on the orientation or positional relationship as shown in the drawings. These terms are used primarily to better describe the disclosure herein and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, a fixed connection, a removable connection, or a unitary construction may be used; can be a mechanical connection, or a point connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Finally, like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a brake pad thickness detecting device according to an embodiment of the present application. The device can be applied to any position capable of detecting, and the position for detecting comprises an automobile, and particularly, the device can be arranged on the automobile so as to play a role of real-time detection on the automobile. Wherein the brake pad thickness detecting apparatus includes a detector 100, a determiner 200, and a controller 300, wherein,
a detector 100 for detecting high-level pulse data corresponding to a thickness of a pad of a brake pad;
the determiner 200 is connected to the detector 100, and is configured to obtain determination result data of whether the high level pulse data is valid;
the controller 300 is connected to both the detector 100 and the determiner 200, and is configured to calculate a brake pad thickness according to the high level pulse data, and output the brake pad thickness according to the determination result data.
In this embodiment, the controller 300 may further output and acquire status information of the brake pad, wherein the status information of the brake pad may be output to the controller 300 by the determiner 200, so that the controller 300 may output the status information of the brake pad.
In this embodiment, the thickness of the brake pad may be understood as the thickness information of the brake pad, wherein the thickness information of the brake pad may be outputted according to the corresponding value as required, wherein the thickness information of the brake pad at least includes the actual thickness (in centimeters) of the brake pad and the percentage of the brake pad to the initial state (i.e. the percentage of the real-time thickness of the brake pad to the initial thickness).
It can be seen that, with the brake pad thickness detecting apparatus described in fig. 1, the detector 100 can detect the high-level pulse data corresponding to the thickness of the brake pad, and the determiner 200 can determine whether the vehicle is currently in the braking state, the determiner 200 outputs the determination result data of whether the vehicle is currently in the braking state, and the controller 300 obtains the high-level pulse data and the determination result data, and when the determination result data is 1, it indicates that the high-level pulse data is valid, and calculates the thickness of the brake pad according to the pulse width information of the high-level pulse data. It can be seen that, use foretell brake block thickness detection device, can detect at any time at the vehicle in-process of marcing to the numerous and diverse operation of parking detection and testing process in the tradition has been avoided, uses the device to detect simultaneously, can also reduce the time that tradition detected, thereby improves detection efficiency.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural view of another brake pad thickness detecting apparatus according to an embodiment of the present application. The structural schematic diagram of the brake pad thickness detecting apparatus depicted in fig. 2 is modified from the structural schematic diagram of the brake pad thickness detecting apparatus depicted in fig. 1. Wherein, this brake block filler block thickness detection device still includes: the power converter 400 includes, among other things,
the power converter 400 has one end connected to the vehicle-mounted power supply and the other end connected to the detector 100, the determiner 200, and the controller 300, and is configured to supply power to the detector 100, the determiner 200, and the controller 300.
As an alternative embodiment, the brake pad thickness detecting apparatus further includes a display 500, wherein,
the display 500 is connected to the controller 300 for displaying the brake pad thickness.
In this embodiment, referring to fig. 4, the display control circuit 520 is composed of an LCD1602 display module, a 10 Ω resistor, and a 10k Ω adjustable resistor. Pin 1 (VSS) and pin 5 of LCD1602 display module
And 16 pins (BLK GND) are connected with a ground wire (GND), 3 pins are connected with a fixed end and an adjustable end of a 10k omega adjustable resistor, 2 pins (VDD) are connected with a power supply (VCC), 15 pins (VCC) are connected with the power supply (VCC) through the 10 omega resistor, 4 pins (RS) are connected with 3 pins (P1.2) of a controller 300 (also called as an MCU minimum system), 6 pins (E) are connected with 4 pins (P1.3) of the MCU minimum system, and 7-14 pins (D0-D7) f are respectively connected with 39-32 pins (P0.0-P0.7) of the MCU minimum system; the other fixed end of the 10k omega adjustable resistor is connected with the Ground (GND).
As an alternative embodiment, the display 500 includes a display control circuit 520 and a display element 510, wherein,
the display control circuit 520 is connected to the controller 300;
the display assembly 510 is coupled to the display control circuit 520 for displaying the brake pad thickness.
In this embodiment, the power converter 400 is connected to the display 500 for supplying power to the display.
Referring to fig. 3, a schematic structural diagram of the brake pad thickness detecting apparatus illustrated in fig. 3 is a schematic structural diagram of a further detailed structure of the brake pad thickness detecting apparatus illustrated in fig. 2, and as can be seen from fig. 3, the brake pad thickness detecting apparatus is operated based on a plurality of controllers 300 or a plurality of control chips.
Meanwhile, fig. 3 shows that the 1 port (V) of the power converter 400I+) Connected to the positive electrode of the vehicle-mounted power supply, 2-port (V) of the power converter 400I-) Connected to the negative electrode of the vehicle-mounted power supply, 3-port (V) of the power converter 400O+) Connected to a 40 pin (VCC) of the controller 300 (may also be referred to as MCU minimum system), a1 port (VCC) of the detector 100 (may also be referred to as thickness-to-pulse conversion circuit), a1 port (VCC) of the determiner 200 (may also be referred to as data validity determination circuit), and a VCC port of the display control circuit 520, and a 4 terminal (V) of the power converter 400O-) And the MCU minimum system is connected with a 20 pin (GND), a2 port (GND) of the thickness-pulse conversion circuit, a2 port (GND) of the data validity judging circuit and a GND port of the display system.
It can be seen that, the brake pad thickness detection device described in fig. 2 can be implemented to be better compatible with a vehicle-mounted space, and can provide an additional display space so that a user can directly view the detection result of the brake pad thickness, thereby improving the practicability and convenience of the brake pad thickness detection device.
Example 3
Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a brake pad thickness detecting device according to an embodiment of the present application. Wherein the content of the first and second substances,
the detector 100 comprises a sensor assembly CS, a first switch S1A first resistor R1A second resistor R2A third resistor R3A fourth resistor R4And a first voltage comparator a1, wherein,
first switch S1A single pole double throw electronic switch; first switch S1Is connected with the controller 300; first switch S1The negative input terminal of (2) is grounded; first switch S1Second output terminal and first resistor R1One end of the two ends are connected; first switch S1For performing switching control according to a control signal sent by the controller 300;
one end of the sensor assembly CS and the first switch S1The third output end of the first detecting circuit is connected with the third output end of the second detecting circuit and is used for detecting capacitance data which is in direct proportion to the thickness of the pad of the brake pad and is used for forming high-level pulse data; the other end of the sensor component CS is grounded;
the non-inverting terminal of the first voltage comparator A1 and the first switch S1First output terminal, second resistor R2Is connected to the determiner 200; the inverting terminal of the first voltage comparator A1 and the third resistor R3One end of (1), a fourth resistor R4One end of the two ends are connected; the output end of the first voltage comparator A1 is connected with the controller 300;
a second resistor R2Is connected with the other end of the sensor component CS;
third resistor R3The other end of (1) and a first resistor R1The other ends of the two are connected;
a fourth resistor R4Is connected to the other end of the sensor assembly CS.
As an alternative embodiment, the sensor assembly CS includes a capacitive sensor CXAnd a brake switch S2Wherein, in the step (A),
brake switch S2And a first switch S1Is connected to the third output terminal of the brake switch S2The other end of the brake switch S is grounded2The switch is used for controlling the switch according to the braking state;
capacitive sensor CXAnd a brake switch S2And the parallel connection is used for detecting capacitance data corresponding to the thickness of the pad of the brake pad.
In this embodiment, the brake switch S2The physical form of the brake switch can be the switch existing in the physical form in the circuit.
For example, when the capacitive sensor is in a braking condition during use, the capacitive sensor may contact a conductive plate to disable the capacitive sensor due to braking, and the conductive plate is the brake switch S2The actual physical form of (a). Thus, the brake switch S in practice2Can be present in the detection circuit or can be present in practice to play a corresponding role, and is used for the brake switch S2The existence state of (c) is not limited in any way in this embodiment.
In the present embodiment, the brake switch S2May be a part of a circuit structure or a part of a vehicle structure, and is not limited in this embodiment.
As an alternative embodiment, the power supply terminal of the first voltage comparator A1 and the third resistor R3And the other end of the first resistor R1And the other ends are commonly connected to a power supply.
As an alternative embodiment, the ground terminal of the first voltage comparator a1 and the second resistor R2The other end of (1), a fourth resistor R4And the other end of the sensor assembly CS is commonly grounded.
In this embodiment, the detector 100 (which may also be referred to as a thickness-to-pulse conversion circuit) converts the brake pad thickness to a high level pulse proportional to the brake pad thickness value. In fig. 4, the thickness-to-pulse conversion circuit is formed by a first switch S of a sensor assembly CS1First resistance R1A second resistor R2A third resistor R3A fourth resistor R4And a first voltage comparator a 1.
In the present embodiment, the circuit model of the sensor component CS is equivalent to the capacitive sensor CXAnd a brake switch S2The brake block is in a non-braking state and corresponds to the brake switch S2When the brake pad is disconnected, the brake pad is in a braking state and corresponds to the brake switch S2And (5) closing. One of the sensor components CSPolar plate and first switch S1The other polar plate is connected with a ground wire (GND); first switch S1Is connected with the Con port of the thickness-pulse conversion circuit, and a first switch S1Is connected to the Ground (GND), a first switch S1First output terminal and second resistor R2Is connected to the non-inverting terminal (+) of the first voltage comparator A1 and the SO port of the thickness-pulse converting circuit, and a first switch S1Second output terminal and first resistor R1One end of the two ends are connected; a first resistor R1Is connected with a power supply (VCC); a second resistor R2The other end of the ground wire (GND) is connected with the ground wire (GND); third resistor R3Is connected to a power supply (VCC), a third resistor R3And the other end of the first resistor and a fourth resistor R4Is connected to the inverting terminal (-) of the first voltage comparator a 1; a fourth resistor R4The other end of the ground wire (GND) is connected with the ground wire (GND); a power supply terminal (VCC) of the first voltage comparator a1 is connected to the power supply (VCC), a ground terminal (GND) of the first voltage comparator a1 is connected to the Ground (GND), and an output terminal (VO1) of the first voltage comparator a1 is connected to the Ps port of the thickness-to-pulse conversion circuit.
In the present embodiment, in the thickness-to-pulse conversion circuit of fig. 4, the third resistor R3And a fourth resistor R4The voltage is divided to provide a reference voltage for the inverting terminal (-) of the first voltage comparator A1
After the start of the measurement (first switch S)1Is adjusted to be 13), the P1.0 port of the controller 300 (which may also be referred to as an MCU minimum system) outputs a high level with a duration of T1, and the first switch S is controlled by the Con port of the thickness-to-pulse conversion circuit1The third output end of the power supply is connected with the second output end, if the brake block is in a non-braking state at the moment, the power supply VCCThrough a first resistor R1To the capacitive sensor CXCharging is carried out; then the P1.0 port of the MCU minimum system outputs a low level with the duration of T2, and the Con port of the thickness-pulse conversion circuit controls the first switch S1 to be at the first levelThree output terminals connected to the first output terminal, and a capacitive sensor CXThrough a second resistor R2Discharging; when the capacitive sensor CXIs greater than
At the output (V) of the first voltage comparator A1O1) At high level when the capacitive sensor CXIs discharged to a voltage of less than
At the output (V) of the first voltage comparator A1O1) Is low, so that the output (V) of the first voltage comparator A1 can be obtainedO1) Or the high-level pulse width TH of the Ps port of the thickness-pulse conversion circuit is
MCU minimum system pass
The port measures the high-level pulse width TH of the Ps port of the thickness-pulse conversion circuit to obtain the capacitance sensor CXThe capacitance value of the brake pad is in direct proportion to the real-time thickness of the pad block; finally, the numerical value DT is compared with the numerical value DT0 corresponding to the initial thickness of the brake pad stored in the MCU minimum system to obtain the percentage Pt of the real-time thickness of the brake pad relative to the initial thickness, namely
When the P1.0 port of the MCU minimum system is at high level, if the brake pad is in a braking state, the capacitance sensor CXIs zero, the output terminal (V) of the first voltage comparator A1O1) The high level pulse width of (c) is also zero. If in the capacitive sensor CXFrom detecting the amount of electricity to
In the discharging process, when the brake pad is in a braking state, the capacitance sensor CXThe voltage of (a) rapidly drops to zero,output terminal (V) of the first voltage comparator A1O1) The high level of (1) jumps immediately to the low level.
As an alternative embodiment, the determiner 200 includes a fifth resistor R5A sixth resistor R6NOT gate G1Two-input NOR gate G2And a second voltage comparator a2, wherein,
the non-inverting terminal of the second voltage comparator a2 is connected to the detector 100; the inverting terminal of the second voltage comparator A2 and the fifth resistor R5One end of (1), a sixth resistor R6One end of the two ends are connected; the output end of the second voltage comparator A2 is NAND gate G1Are connected with the input end of the power supply;
two-input NOR gate G2Is connected to the detector 100; two-input NOR gate G2The second input end of the NAND gate G1The output ends of the two are connected; two-input NOR gate G2The output end of the controller is connected with the control end;
fifth resistor R5The other end of which is connected to the detector 100;
a sixth resistor R6And the other end is connected to the detector 100.
In this embodiment, the determiner 200 (also referred to as a data validity determining circuit) generates a level signal capable of indicating the brake pad state and the data validity according to the electrical parameter of the thickness-to-pulse converting circuit, wherein a high level "1" in the level signal indicates that the brake pad is in the non-braking state and the measurement data is valid, and a high level "1" in the level signal does not indicate that the brake pad is in the braking state and the measurement data is invalid. In FIG. 4, the data validity judging circuit is constituted by a fifth resistor R5A sixth resistor R6NOT gate G1Two-input NOR gate G2And a second voltage comparator a 2. Fifth resistor R5With one terminal of the power supply (V)CC) Connected, fifth resistor R5And the other end of the same with the inverting terminal (-) of the second voltage comparator a2 and the sixth resistor R6One end of the two ends are connected; a sixth resistor R6The other end of the ground wire (GND) is connected with the ground wire (GND); the non-inverting terminal (+) of the second voltage comparator A2 is connected to the SI2 port of the data validity determination circuitThe power supply terminal (VCC) of the second voltage comparator A2 is connected to the power supply (V)CC) The ground terminal (GND) of the second voltage comparator A2 is connected to the Ground (GND), and the output terminal (V) of the second voltage comparator A2O2) NAND gate G1Are connected with the input end of the power supply; NOT gate G1And a two-input NOR gate G2Is connected with one input end of the first switch; two-input NOR gate G2Is connected with the SI1 port of the data validity judging circuit; two-input NOR gate G2The output terminal of the data validity judging circuit is connected with the ES port of the data validity judging circuit.
In the present embodiment, the fifth resistor R in fig. 45And a sixth resistor R6The voltage is divided to provide a reference voltage for the inverting terminal (-) of the second voltage comparator A2
Fifth resistor R5A sixth resistor R6Should be of a size to ensure
Is less than
When the thickness of the pad of the brake pad is normally tested, the output end (V) of the first voltage comparator A1 is usedO1) After changing from high level to low level, the output end (V) of the second voltage comparator A2O2) The high level of the data validity judging circuit lasts for a period of time, and a high level pulse appears at the ES port of the data validity judging circuit, which indicates that the test data is valid. During the test of the thickness of the pad of the brake pad, and at the output of the first voltage comparator A1 (V)O1) Before the high level is changed into the low level, if the brake of the brake block occurs, the output end (V) of the first voltage comparator A1O1) And the output terminal (V) of the second voltage comparator A2O2) When the high level is changed into the low level almost at the same time, the ES port of the data validity judging circuit does not generate high level pulse, which indicates that the test data is invalid.
As an alternative embodiment, the controller 300 is a single-chip microcomputer.
In this embodiment, the controller 300 is an MCU, and further, the controller 300 may be an 89C51 single chip microcomputer.
In this embodiment, after the controller 300 (which may also be referred to as an MCU minimum system) completes the measurement of the width of the high-level pulse output from the thickness-pulse conversion circuit, the validity of the brake pad thickness test data is determined by querying the signal level of the ES port of the data validity determination circuit, and the display system is controlled to display the status of the brake pad and the valid measurement data.
In this embodiment, the MCU minimal system can also pass through its serial communication port (
And
) And communicating with other electronic systems, transmitting the obtained thickness of the pad of the brake pad and the state data of the brake pad to the other electronic systems, receiving the commands of the other electronic systems, and operating according to the commands.
In this embodiment, the controller 300 (which may also be referred to as an MCU minimum system) may be a single chip microcomputer, and the single chip microcomputer may be an 89C51 single chip microcomputer. As shown in fig. 4, a pin of the MCU minimum system is a pin of the 89C51 single chip microcomputer, the MCU minimum system is connected to the display control circuit 520 (also referred to as a display system) through a BUS (BUS), a pin 1 (P1.0 port) of the MCU minimum system is connected to a port 3 (Con) of the detector 100 (also referred to as a thickness-to-pulse converting circuit), a pin 2 (P1.1 port) of the MCU minimum system is connected to a port 5 (ES) of the determiner 200 (also referred to as a data validity determining circuit), and a pin 12 (P3.2/port) of the MCU minimum system is connected to a port 5 (Ps) of the thickness-to-pulse converting circuit and a port 3 (SI1) of the data validity determining circuit; the 4 port (SO) of the thickness-pulse conversion circuit is connected with the 4 port (SI2) of the data validity judging circuit.
Therefore, by implementing the circuit structure of the brake pad thickness detection device described in fig. 4, the thickness of the brake pad can be acquired more accurately, and the acquisition of the thickness of the brake pad can be avoided in a braking state, so that the use intelligence and the simplicity of the device are realized.
In addition, please refer to fig. 5, fig. 5 is a schematic circuit diagram of a power converter 400 according to an embodiment of the present disclosure.
As shown in fig. 5, the power converter 400 includes a three-terminal regulator ic 7805 and four capacitors, and the configuration thereof is as shown in the figure, and as for the use of the three-terminal regulator ic 7805, reference may be made to the chip instruction manual.
In this embodiment, the power converter 400 converts the vehicle power into a suitable power (VCC) to supply power to the MCU minimum system, the thickness-to-pulse conversion circuit, the data validity determination circuit, and the display 500 (including the display control circuit 520 and the display module 510). Fig. 5 is an implementation of a power converter 400 provided for 12V, 24V onboard power. In fig. 5, a three-terminal integrated voltage regulator 7805 is used for converting a 12V or 24V vehicle-mounted power supply into a 5V direct-current power supply to supply power to the MCU minimum system, the thickness-pulse conversion circuit, the data validity judgment circuit and the display system. For a vehicle-mounted power supply with higher voltage, such as a 48V power supply, a voltage reduction measure can be taken at the front end of 7805, so that the input voltage of the three-terminal integrated voltage regulator 7805 is within the safe working voltage range.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, for example, the block diagrams in the figures illustrate the architecture, functionality, and operation of an apparatus according to various embodiments of the present application, which may be implemented. In this regard, each block in the block diagrams may represent a module, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams, and combinations of blocks in the block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A brake pad thickness detecting apparatus, comprising a detector, a determiner, and a controller, wherein,
the detector is used for detecting high-level pulse data corresponding to the thickness of the brake pad;
the judger is connected with the detector and is used for acquiring judgment result data whether the high-level pulse data is valid or not;
the controller is connected with the detector and the judger and used for calculating according to the high-level pulse data to obtain the thickness of the brake pad and outputting the thickness of the brake pad according to the judgment result data.
2. The brake pad thickness sensing apparatus of claim 1, wherein the detector includes a sensor assembly, a first switch, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first voltage comparator, wherein,
the first switch is a single-pole double-throw electronic switch; the positive input end of the first switch is connected with the controller; the negative input end of the first switch is grounded; the second output end of the first switch is connected with one end of the first resistor; the first switch is used for performing switch control according to the control signal sent by the controller;
one end of the sensor assembly is connected with the third output end of the first switch and is used for detecting capacitance data corresponding to the thickness of a pad of the brake pad, and the capacitance data is used for forming high-level pulse data; the other end of the sensor component is grounded;
the non-inverting end of the first voltage comparator is connected with the first output end of the first switch, one end of the second resistor and the judger; the inverting end of the first voltage comparator is connected with one end of the third resistor and one end of the fourth resistor; the output end of the first voltage comparator is connected with the controller;
the other end of the second resistor is connected with the other end of the sensor component;
the other end of the third resistor is connected with the other end of the first resistor;
the other end of the fourth resistor is connected with the other end of the sensor component.
3. The brake pad thickness sensing apparatus of claim 2, wherein the sensor assembly includes a capacitive sensor and a brake switch, wherein,
one end of the brake switch is connected with the third output end of the first switch, the other end of the brake switch is grounded, and the brake switch is used for performing switch control according to a braking state;
the capacitance sensor is connected with the brake switch in parallel and used for detecting capacitance data corresponding to the thickness of the brake pad.
4. The brake pad thickness detecting apparatus of claim 2, wherein a power source terminal of the first voltage comparator, the other end of the third resistor, and the other end of the first resistor are commonly connected to a power source.
5. The brake pad thickness sensing apparatus of claim 2, wherein a ground terminal of the first voltage comparator, the other end of the second resistor, the other end of the fourth resistor, and the other end of the sensor assembly are commonly grounded.
6. The brake pad thickness detecting apparatus of claim 1, wherein the determiner includes a fifth resistor, a sixth resistor, a not gate, a two-input nor gate, and a second voltage comparator, wherein,
the non-inverting end of the second voltage comparator is connected with the detector; the reverse end of the second voltage comparator is connected with one end of the fifth resistor and one end of the sixth resistor; the output end of the second voltage comparator is connected with the input end of the NOT gate;
the first input end of the two-input NOR gate is connected with the detector; the second input end of the two-input NOR gate is connected with the output end of the NOR gate; the output end of the two-input NOR gate is connected with the control end;
the other end of the fifth resistor is connected with the detector;
the other end of the sixth resistor is connected with the detector.
7. The brake pad thickness sensing device of claim 1, wherein the controller is a single-chip microcomputer.
8. The brake pad thickness detection apparatus of claim 1, further comprising a power converter, wherein,
one end of the power converter is connected with the vehicle-mounted power supply, and the other end of the power converter is connected with the detector, the judger and the controller and used for supplying power to the detector, the judger and the controller.
9. The brake pad thickness detection device of claim 1, further comprising a display, wherein,
the display is connected with the controller and used for displaying the thickness of the brake pad lining block.
10. The brake pad thickness sensing device of claim 9, wherein the display includes a display control circuit and a display assembly, wherein,
the display control circuit is connected with the controller;
the display component is connected with the display control circuit and used for displaying the thickness of the brake pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921497835.7U CN210391110U (en) | 2019-09-10 | 2019-09-10 | Brake pad filler block thickness detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921497835.7U CN210391110U (en) | 2019-09-10 | 2019-09-10 | Brake pad filler block thickness detection device |
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| CN210391110U true CN210391110U (en) | 2020-04-24 |
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| CN201921497835.7U Active CN210391110U (en) | 2019-09-10 | 2019-09-10 | Brake pad filler block thickness detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435627A (en) * | 2019-09-10 | 2019-11-12 | 铜仁学院 | A kind of brake block pad thickness detection apparatus |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435627A (en) * | 2019-09-10 | 2019-11-12 | 铜仁学院 | A kind of brake block pad thickness detection apparatus |
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