CN216374507U - Sensor device of brake pedal, brake pedal assembly and vehicle braking system - Google Patents
Sensor device of brake pedal, brake pedal assembly and vehicle braking system Download PDFInfo
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- CN216374507U CN216374507U CN202121307481.2U CN202121307481U CN216374507U CN 216374507 U CN216374507 U CN 216374507U CN 202121307481 U CN202121307481 U CN 202121307481U CN 216374507 U CN216374507 U CN 216374507U
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- brake pedal
- linkage rod
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- magnet
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Abstract
The utility model discloses a sensor device of a brake pedal, the brake pedal is connected to a vacuum booster via a linkage rod, the sensor device comprises a pressure sensor for sensing the pressure in a cavity of the vacuum booster, and further comprises: the pressure sensor includes a linkage rod, a magnet mounted on the linkage rod for linear movement therewith, and a sensing element integrated on the pressure sensor for sensing a change in magnetic flux of the magnet as the magnet moves linearly with the linkage rod. The utility model also discloses a brake pedal assembly comprising the sensor device and a vehicle brake system comprising the brake pedal assembly. The sensor device can accurately measure the linear displacement of the linkage rod, and further determine the treading degree of the brake pedal, so that the brake operation is effectively controlled; in addition, the Hall chip is independently packaged, the measurement precision is high, and a digital signal with high anti-interference capability can be output.
Description
Technical Field
The present invention relates to the field of sensors, and more particularly, to a sensor device of a brake pedal, a brake pedal assembly including the same, and a vehicle brake system including the same.
Background
The brake pedal assembly is a functional system for decelerating a vehicle, which is used very frequently. Referring to fig. 1, a vacuum booster 3 is provided in a conventional brake pedal assembly, and a vacuum source thereof is derived from a vacuum pump 2. The vacuum booster 3 is connected to the brake pedal 1 (i.e., "brake pedal") via a linkage rod 7, and a pressure sensor 4 for measuring vacuum pressure in a cavity thereof is provided in the vacuum booster 3 to provide boosting force to the foot pedal according to the measured vacuum pressure, thereby assisting the driver in generating sufficient braking force.
At present, two methods for detecting the treading degree of the pedal are generally available in the market. The most common method is to mount a special displacement sensor 5 on the linkage rod 7 for measuring the moving displacement of the linkage rod 7. The disadvantage of this arrangement is that the displacement sensor 5 has a dedicated PCB integrated therein, which is relatively expensive to manufacture and also has a relatively high requirement for installation space. In order to install such a displacement sensor for measuring the degree of stepping on the foot pedal, it may be necessary to modify the layout of the entire brake system for the entire vehicle factory.
Further, an angle sensor 6 dedicated to measuring the change in the angle of the foot pedal may be attached, and the degree of stepping on the foot pedal may be estimated from the change in the angle of the foot pedal. The disadvantage of this method is that if the pedal shaft is contaminated or rotates for a long time, the measurement accuracy of the angle sensor 6 is greatly affected.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the conventional technical scheme for detecting the treading degree of the brake pedal, the utility model provides a novel sensor device for the brake pedal. The sensor device can measure the pressure value in the cavity of the vacuum booster to provide proper boosting for the pedal; simultaneously, can also accurately measure the linear displacement of gangbar (thereby calculate brake pedal's degree of trampling) to effectively control the friction of brake block and wheel according to brake pedal's degree of trampling, thereby play the brake effect of different degrees.
According to a first aspect of the present invention, there is provided a sensor arrangement for a brake pedal connected to a vacuum booster via a linkage rod to provide assistance by means of the vacuum booster, the sensor arrangement comprising a pressure sensor for sensing pressure within a cavity of the vacuum booster, the sensor arrangement further comprising:
a magnet mounted on the linkage rod to move linearly along with the linkage rod, an
A sensing element integrated on the pressure sensor for sensing a change in magnetic flux of the magnet when the magnet moves linearly along with the linkage rod and outputting a corresponding sensing signal.
According to an alternative embodiment, the sensing element is a hall chip.
According to an alternative embodiment, the hall chip has a plurality of metal pins soldered to the ports of the pressure sensor.
According to an alternative embodiment, the magnets are injection-moulded to the ends of the linkage rods.
According to a second aspect of the present invention, there is provided a brake pedal assembly comprising:
a brake pedal is arranged on the front end of the brake pedal,
the linkage rod is connected to the brake pedal and linearly moves along with the stepping action of the brake pedal;
a vacuum booster connected to a vacuum pump and to the brake pedal via the linkage rod to provide assistance to the brake pedal; and
the sensor device for a brake pedal according to the utility model.
According to a second aspect of the present invention, there is provided a vehicle brake system comprising:
a brake pedal assembly according to the present invention, and
a control unit configured to determine a degree of depression of the brake pedal according to a sensing signal output by a sensor device in the brake pedal assembly, and to perform a corresponding braking operation according to the determined degree of depression of the brake pedal.
According to an alternative embodiment, the sensing signal output by the sensor device is an analog signal or a PWM digital signal.
According to an optional embodiment, the control unit is a vehicle control unit.
The sensor device can accurately measure the linear displacement of the linkage rod (so as to calculate the treading degree of the brake pedal), so that the friction between the brake pad and the wheel is effectively controlled according to the treading degree of the brake pedal, and the braking effect of different degrees is achieved; in addition, the Hall chip is independently packaged, the measurement precision is high, and a digital signal with high anti-interference capability can be output. The sensor device according to the utility model can be used both in fuel vehicles and in new energy vehicles.
Drawings
Other features and advantages of the devices and systems of the present invention will be apparent from, or are more particularly, described in the accompanying drawings, which are incorporated herein, and the following detailed description of the embodiments, which together serve to explain certain principles of the present invention.
FIG. 1 shows a schematic view of a brake pedal assembly including a conventional sensor arrangement.
FIG. 2 shows a schematic view of a brake pedal assembly including an improved sensor arrangement according to the present invention.
FIG. 3 shows a block diagram of a brake pedal assembly including an improved sensor arrangement according to the present invention.
In the above drawings, the same reference numerals are used to designate the same elements or components.
Detailed Description
A sensor device for a brake pedal according to the present invention will be described below by way of embodiments with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Rather, it is contemplated that the utility model may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims.
FIG. 1 shows a schematic structural view of a brake pedal assembly including a conventional sensor structure. Wherein a pressure sensor 4 is indispensable for measuring the vacuum pressure in the cavity of the vacuum booster, thus providing assistance to the foot pedal accordingly. In addition, in the conventional brake pedal assembly, a special displacement sensor 5 is required to be installed to measure the moving displacement of the linkage rod 7, so as to calculate the treading degree of the pedal; and/or, an angle sensor 6 for measuring the change of the angle of the foot pedal is mounted on the foot pedal, and the degree of stepping on the foot pedal is estimated from the measured change of the angle. This arrangement with the additional provision of the displacement sensor 5 and/or the angle sensor 6 is relatively expensive to produce and also requires a relatively large installation space for the sensors.
FIG. 2 shows a schematic view of a brake pedal assembly including an improved sensor arrangement according to the present invention. In fig. 2, the same elements or components as those in fig. 1 are denoted by the same reference numerals.
Unlike fig. 1, the improved sensor device according to the present invention comprises, in addition to a pressure sensor 81 for measuring the pressure value inside the cavity of the vacuum booster, a second sensor for measuring the degree of stepping of the foot pedal, which comprises a magnet 82 mounted to the linkage 7 of the vacuum booster, and a sensing element 83 integrated on the pressure sensor 81. The magnet 82 may be injection moulded to the end of the linkage 7.
The sensing element 83 may preferably be a hall chip. The hall chip has a separate package that can be soldered to the pressure sensor 81 port via metal pins. The Hall chip has a high working temperature range of-55 ℃ to 150 ℃, has the advantages of small volume, light weight, low power consumption and vibration resistance, and can effectively prevent pollution and corrosion. In addition, the measurement error of the Hall chip is less than 2%, and the displacement stroke of a specific point is calibrated by a laboratory, so that the Hall chip can output a high-precision measurement result. Besides, the Hall chip can output analog signals or digital signals according to customer requirements, and has strong anti-interference capability when outputting digital signals (namely PWM duty ratio).
When the brake pedal is stepped on, the pressure value in the chamber of the vacuum booster changes, and the pressure sensor 81 in the sensor device assumes the responsibility of detecting the change in pressure inside the chamber. The type of output signal of the pressure sensor can be selected according to the actual needs of the customer, and can be, for example, an analog signal or a SENT digital signal. In the case of an analog signal, the pressure value in the vacuum booster is proportional to the output value of the pressure sensor.
Based on the feedback result of the pressure sensor 81, the vacuum pump can be controlled to work to adjust the negative pressure in the cavity of the booster, so that the auxiliary pedal gives assistance, and a driver can easily step on the pedal. For example, when the pressure in the cavity of the booster is detected to be less than 0.26bar, the output voltage of the pressure sensor 81 is 1.36V, and the vacuum pump can be controlled to stop working; when the pressure in the cavity of the booster is detected to be greater than 0.36bar, the output voltage of the pressure sensor 81 is 1.86V, and the vacuum pump can be controlled to start working at the moment;
when the brake pedal is stepped on, the linkage rod connected with the brake pedal makes linear motion, and simultaneously, the magnet in the vacuum booster can also make linear motion along with the linkage rod 7, so that the change of magnetic flux is generated. Because hall chip rigidity, when the position of magnet changes, the change of magnet 82 magnetic flux can be sensed to hall chip, through its inside calculation, and corresponding PWM digital signal (also can output analog signal) can be exported to hall chip, and this digital signal itself has very strong interference killing feature.
The PWM signal output by the sensor device, particularly the hall chip thereof, may be further provided to an ECU (e.g., a vehicle control unit), and the movement displacement of the magnet may be determined based on the PWM signal, and thus the degree of stepping on the foot pedal (i.e., the braking intention of the driver) may be determined. Subsequently, the ECU may transmit the driver's braking intention to the vehicle braking system to control the braking strength of the brake pads.
Fig. 3 shows a block diagram of a brake pedal assembly including an improved sensor device 8 according to the present invention. Wherein the brake pedal 1 is connected to a vacuum booster 3 via a linkage rod 7 to provide assistance by means of the vacuum booster 3, the vacuum source of the vacuum booster 3 coming from a vacuum pump 2.
The sensor device 8 includes a pressure sensor 81 for sensing the pressure in the cavity of the vacuum booster 3, and further includes a second sensor for measuring the degree of stepping of the foot pedal. In particular, the second sensor comprises a magnet 82 and a sensing element 83, the sensing element 83 being in particular a hall chip.
The magnet 82 is mounted on the linkage rod 7 of the vacuum booster to move linearly along with the linkage rod during depression of the brake pedal. The hall chip is integrated on the pressure sensor 81 and is used for sensing the magnetic flux change of the magnet 82 when the magnet moves linearly along with the linkage rod 7 and outputting a corresponding sensing signal. The sensing signal may be either a PWM digital signal or an analog signal, depending on the user's choice.
The present invention also relates to a vehicle braking system including the brake pedal assembly shown in fig. 2 and 3, the braking system including an ECU. The PWM signal output by the sensor device 8, particularly the hall chip thereof, may be further provided to an ECU (e.g., a vehicle control unit), and the movement displacement of the magnet may be determined based on the PWM signal, and thus the degree of stepping on the foot pedal (i.e., the braking intention of the driver) may be determined. Subsequently, the ECU may transmit the driver's braking intention to the vehicle braking system to control the braking strength of the brake pads.
In conclusion, the sensor device can measure the pressure value in the cavity of the vacuum booster to provide proper boosting for the pedal plate; simultaneously, can also accurately measure the linear displacement of gangbar (thereby calculate brake pedal's degree of trampling) to effectively control the friction of brake block and wheel according to brake pedal's degree of trampling, thereby play the brake effect of different degrees. The Hall chip used in the sensor device is independently packaged, the measurement precision is high, and a digital signal with strong anti-interference capability can be output.
Although the present invention has been described with reference to the preferred embodiments, it is not to be limited thereto. Various changes and modifications can be made without departing from the spirit and scope of the utility model, and the scope of the utility model should be determined by the appended claims.
Claims (8)
1. Sensor device (8) of a brake pedal, the brake pedal (1) being connected to a vacuum booster (3) via a linkage rod (7) to provide an assistance force by means of the vacuum booster, the sensor device (8) comprising a pressure sensor (81) for sensing the pressure within a cavity of the vacuum booster (3), characterized in that the sensor device (8) further comprises:
a magnet (82), said magnet (82) being mounted on said linkage rod (7) for linear movement therewith, an
A sensing element (83), the sensing element (83) being integrated on the pressure sensor (81) for sensing a change in magnetic flux of the magnet (82) when the magnet (82) moves linearly together with the linkage rod (7) and outputting a corresponding sensing signal.
2. The brake pedal sensor apparatus according to claim 1, wherein the sensing element is a hall chip.
3. The brake pedal sensor apparatus of claim 2, wherein the hall chip has a plurality of metal pins soldered to the ports of the pressure sensor.
4. The brake pedal sensor apparatus according to any one of claims 1 to 3, wherein the magnet is connected to a distal end of the linkage rod in an injection molding manner.
5. A brake pedal assembly, comprising:
a brake pedal (1) is provided,
the linkage rod (7) is connected to the brake pedal (1) and linearly moves along with the stepping action of the brake pedal;
a vacuum booster (3), the vacuum booster (3) being connected to a vacuum pump (2) and to the brake pedal via the linkage rod (7) to provide assistance to the brake pedal; and
sensor device (8) of a brake pedal according to any one of claims 1 to 4.
6. A vehicle braking system, characterized by comprising:
the brake pedal assembly of claim 5, and
a control unit configured to determine a degree of depression of the brake pedal (1) according to a sensing signal output by a sensor device (8) in the brake pedal assembly, and to perform a corresponding braking operation according to the determined degree of depression of the brake pedal.
7. Vehicle braking system according to claim 6, characterized in that the sensing signal output by the sensor device (8) is an analog signal or a PWM digital signal.
8. A vehicle braking system according to claim 6 or 7 wherein the control unit is a vehicle control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121307481.2U CN216374507U (en) | 2021-06-11 | 2021-06-11 | Sensor device of brake pedal, brake pedal assembly and vehicle braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121307481.2U CN216374507U (en) | 2021-06-11 | 2021-06-11 | Sensor device of brake pedal, brake pedal assembly and vehicle braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216374507U true CN216374507U (en) | 2022-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121307481.2U Active CN216374507U (en) | 2021-06-11 | 2021-06-11 | Sensor device of brake pedal, brake pedal assembly and vehicle braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216374507U (en) |
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2021
- 2021-06-11 CN CN202121307481.2U patent/CN216374507U/en active Active
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