CN110553572B - Sensor device for a vehicle brake pedal, sensor for a vehicle brake pedal and sensing method - Google Patents

Sensor device for a vehicle brake pedal, sensor for a vehicle brake pedal and sensing method Download PDF

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Publication number
CN110553572B
CN110553572B CN201810542922.3A CN201810542922A CN110553572B CN 110553572 B CN110553572 B CN 110553572B CN 201810542922 A CN201810542922 A CN 201810542922A CN 110553572 B CN110553572 B CN 110553572B
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China
Prior art keywords
sensing
signal
trigger
voltage value
brake pedal
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CN110553572A (en
Inventor
赵运华
戴德明
林斐
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Tyco Electronics Shanghai Co Ltd
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Tyco Electronics Shanghai Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/06—Disposition of pedal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Braking Elements And Transmission Devices (AREA)

Abstract

The invention discloses a sensing device for a vehicle brake pedal, a sensor for the vehicle brake pedal and a sensing method. A sensing device for a vehicle brake pedal, comprising: a sensing element for sensing a magnetic field strength of the magnetic element and outputting a sensing signal; after the sensing element is arranged in linkage with the brake pedal in a free state, the sensing element outputs an initial sensing signal; the initial sensing signal corresponds to an initial voltage value; the processing device is in communication connection with the sensing element, so as to receive the sensing signal output by the sensing element, and acquire a corresponding trigger voltage threshold value based on the initial sensing signal; the trigger voltage threshold corresponds to a trigger signal. When the sensor is applied to the corresponding brake pedal, the sensor enables the corresponding brake pedal to send out a trigger signal at a precise trigger position according to the initial sensing signal.

Description

Sensor device for a vehicle brake pedal, sensor for a vehicle brake pedal and sensing method
Technical Field
The invention relates to a sensor, in particular to a sensor, a sensing device and a sensing method for a vehicle brake pedal.
Background
The sensor is a kind of detecting device, which can sense the measured information and convert the sensed information into electric signal or other information output in required form according to certain rules to meet the requirement of information transmission, processing, storage, display, record, control, etc. Accordingly, sensors have a variety of practical uses. For example, corresponding sensors are required to acquire corresponding information on the vehicle, so that an indispensable function is provided for normal and stable operation of the vehicle.
In particular, a brake pedal on a vehicle can be moved to a preset position to realize braking operation, and operations such as on-off of a brake lamp, engine starting in cooperation and the like can be triggered. Thus, sensing the position of the brake pedal by the sensor and obtaining an accurate sensing signal becomes a problem to be considered.
Disclosure of Invention
One of the objectives of the present invention is to overcome the shortcomings of the prior art, and to provide a sensor, a sensor device and a sensing method.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
A sensing device for a vehicle brake pedal, the sensing device comprising: a sensing element for sensing a magnetic field strength of the magnetic element and outputting a sensing signal; after the sensing element is arranged in linkage with the brake pedal in a free state, the sensing element outputs an initial sensing signal; the initial sensing signal corresponds to an initial voltage value (Vf); and
A processing device communicatively coupled to the sensing element to receive the sensing signal output by the sensing element and to obtain a corresponding trigger voltage threshold (Vt) setting based on the initial sensing signal; the trigger voltage threshold corresponds to a trigger signal.
According to one embodiment of the invention, the sensing element outputs a trigger signal when the brake pedal is moved to a preset trigger position;
the processing device receives the trigger signal and outputs a control signal.
According to one embodiment of the invention, the control signal is a brake light switch signal or an automobile start signal.
According to one embodiment of the invention, the processing device comprises a comparison unit;
the comparison unit is used for comparing the voltage value corresponding to the sensing signal output by the sensing element with a trigger voltage threshold (Vt);
When the voltage value corresponding to the sensing signal is smaller than the voltage value corresponding to the trigger threshold, the sensing device outputs a first control signal;
When the voltage value corresponding to the sensing signal is larger than the voltage value corresponding to the trigger threshold, the sensing device outputs a second control signal.
According to one embodiment of the invention, the first control signal is a low level signal (Vl);
The second control signal is a high level signal (Vh).
According to one embodiment of the invention, the processing device comprises a computing unit;
the calculating unit calculates to obtain a trigger voltage threshold according to an initial voltage value corresponding to the initial sensing signal.
According to one embodiment of the invention, the calculation unit sums the initial voltage value (Vf) with a preset constant voltage value (Vc) and obtains the trigger voltage threshold (Vt).
According to one embodiment of the invention, the processing device further comprises a memory unit;
the storage unit stores the preset constant voltage value and the trigger voltage threshold;
The computing unit is communicatively coupled to the storage unit.
According to one embodiment of the present invention, the processing device further includes a judging unit and a triggering unit;
The judging unit receives the sensing signal output by the sensing element;
when the judging unit judges that the voltage value corresponding to the sensing signal falls into a preset trigger voltage range (V01-V02), the triggering unit triggers the calculating unit.
According to one embodiment of the invention, the processing device further comprises a closing unit;
The closing unit is in communication connection with the computing unit;
and after the calculation unit calculates the trigger voltage threshold, the closing unit closes the recalculation function of the calculation unit.
According to one embodiment of the present invention, further comprising:
A circuit board;
the sensing element and the processing device are both arranged on the circuit board and are electrically connected with the circuit board.
According to one embodiment of the invention, the sensing element outputs a linear trigger signal when the brake pedal is moved;
The control signal is a switching signal.
According to one embodiment of the invention, the sensing element is a linear hall element.
According to one embodiment of the present invention, further comprising:
And the magnetic element is used for being arranged in linkage with the brake pedal and can be arranged close to and far away from the sensor.
According to one embodiment of the invention, the magnetic element is a magnet.
A sensor for a vehicle brake pedal, the sensor comprising:
a housing for mounting on a vehicle; and
A sensing element for sensing a magnetic field strength of the magnetic element and outputting a sensing signal;
After the sensing element is arranged in linkage with the brake pedal in a free state, the sensing element outputs an initial sensing signal; the initial sensing signal corresponds to an initial voltage value (Vf); the initial voltage value (Vf) is used to determine a trigger voltage threshold (Vt) of the sensor.
According to one embodiment of the invention, the sensing element outputs a linear trigger signal when the brake pedal is moved;
The control signal is a switching signal.
According to one embodiment of the invention, the sensing element is a linear hall element.
A sensing method for sensing a position of a brake pedal, the sensing method comprising:
sensing the magnetic field intensity of the brake pedal in an initial free state, and acquiring an initial sensing signal; the initial sensing signal corresponds to an initial voltage value (Vf);
Calculating a trigger voltage threshold (Vt) according to the initial voltage value; the trigger voltage threshold corresponds to a trigger signal.
According to one embodiment of the invention, the initial voltage value (Vf) is summed with a predetermined constant voltage value (Vc) and the trigger voltage threshold (Vt) is obtained.
According to one embodiment of the invention, the following operations are performed before the trigger voltage threshold is calculated:
Judging whether a voltage value corresponding to the sensing signal falls into a preset trigger voltage (V01-V02) range or not;
when the voltage value corresponding to the sensing signal falls within the trigger voltage range, an operation of calculating the trigger voltage threshold (Vt) is triggered.
According to one embodiment of the invention, the trigger voltage threshold is calculated by:
the operation of recalculating the trigger voltage threshold (Vt) is turned off.
According to one embodiment of the invention, the following operations are performed after the trigger voltage threshold is obtained:
The position of the brake pedal is sensed, and a corresponding control signal is output according to the sensed trigger signal.
According to one embodiment of the invention, the trigger voltage threshold (Vt) is obtained by:
sensing the position of a brake pedal and outputting a sensing signal;
comparing the magnitude between a voltage value corresponding to a sensing signal and the trigger voltage threshold (Vt);
Outputting a first control signal when the voltage value corresponding to the sensing signal is smaller than the trigger voltage threshold value;
And outputting a second control signal when the voltage value corresponding to the sensing signal is larger than the trigger voltage threshold.
Compared with the prior art, the sensor can obtain the accurate physical quantity such as the trigger voltage threshold value corresponding to the trigger signal based on the physical quantity such as the initial voltage value corresponding to the initial sensing signal. In particular, when the sensor is applied to the corresponding brake pedal, the sensor obtains, through the sensing element, an initial sensing signal of the brake pedal in a free state without being stepped on, according to which the corresponding brake pedal is enabled to emit a trigger signal in a precise trigger position (corresponding to a certain movement stroke). Further, the sensor can always send out a corresponding control signal according to an accurate trigger signal, so that the problems such as inconsistent brake positions and the like caused by brake pedal tolerance are avoided. That is, regardless of the height of the brake pedal at which the brake pedal is first loaded, the sensor is always triggered to emit a corresponding control signal when the brake pedal moves through a preset movement distance, thereby having extremely high accuracy.
Drawings
FIG. 1 is a diagram showing the relationship between a sensor device including a sensor and a brake pedal and a brake lamp.
Fig. 2 is a functional block diagram of the processing device of fig. 1.
FIG. 3a is a diagram showing a relationship between a corresponding position of the sensing unit in FIG. 1 and a corresponding voltage of the sensing signal.
Fig. 3b is a graph showing a relationship between the sensor sensing operation and the corresponding control signal output by the processing device in fig. 1.
Fig. 4 is a flowchart of a sensing method according to a first embodiment of the present invention.
Fig. 5 is a flowchart of a second embodiment of the sensing method of fig. 4.
Fig. 6 is a flowchart of a third embodiment of the sensing method of fig. 4.
Fig. 7 is a flowchart of a fourth embodiment of the sensing method of fig. 4.
Fig. 8 is a flowchart of a fifth embodiment of the sensing method of fig. 4.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
Embodiment one:
Referring to fig. 1, the present invention provides a sensor 101 for a sensing device of a brake pedal of a vehicle. The sensor 101 is adapted to be arranged on the vehicle brake pedal 200 and to sense the magnetic field strength of the magnetic element 300. The sensor 101 comprises a sensing element 10 and a processing device 30.
The sensing element 10 is used for sensing the magnetic field strength of the magnetic element 300. The sensing element 10 is provided on the vehicle brake pedal 200 and outputs a sensing signal. The sensing element 10 may use a physical quantity such as an electrical signal to characterize the magnetic field strength. Preferably, the sensing element 10 outputs a voltage signal to characterize the corresponding magnetic field strength. In order to accurately and conveniently characterize the magnetic field strength, the voltage signal output by the sensing element 10 is related to the magnetic field strength, such as a linear function. Accordingly, in the present embodiment, the magnitude of the voltage value corresponding to the sensing signal of the sensing element 10 is linearly related to the distance (between the sensing element 10 and the magnetic element 200).
When the sensor 101 is first mounted to the brake pedal, the sensor 101 forms an electrical circuit and the sensing element 10 is powered on. At this time, the sensor 101 is capable of sensing the magnetic field strength when the brake pedal 200 is at the initial free position, and outputting an initial sensing signal in the form of a voltage value. Accordingly, the sensor 101 may generate a corresponding sensing signal when it moves to any position along with the brake pedal 200. When the brake pedal 200 is moved to the preset trigger position Lt, the sensing element 10 outputs a sensing signal indicative of the trigger signal.
The specific model, specification, kind, etc. of the sensing element 10 may be as long as they are capable of conforming to the sensed corresponding magnetic field strength. In order to facilitate the representation of the sensing signal characterizing the magnetic field strength in the form of an electrical signal, the sensing element 10 is a hall element. That is, the sensing element 10 performs its function based on the hall effect. Further, in order to facilitate a precise characterization of the linear correlation between the magnetic field strength sensed by the sensing element 10 and the distance, the sensing element 10 is a linear hall chip. That is, the sensing element 10 is a linear hall effect chip. The sensing element 10 may be a 2D hall chip or a 3D hall chip, as required.
Accordingly, the sensing element 10 and the magnetic element 200 have a physical space D therebetween. That is, the sensing element 10 is spaced apart from the magnetic element 200. Accordingly, the sensor 101 can avoid mechanical contact, and the function of the sensor is realized in a non-contact mode, so that the problems of error, abrasion and the like caused by mechanical contact are avoided.
Referring to fig. 2, 3a and 3b, the processing device 30 is configured to process the sensing signal output by the sensing element 10. The processing device 30 may be electrically connected to the sensing element 10. Accordingly, the processing device 30 may be electrically coupled to the sensing element 10, as long as the corresponding transmission of the electrical signal is enabled. Accordingly, the processing means 30 may process the corresponding voltage signal. It will be appreciated that the processing of the corresponding electrical signals may take a variety of forms, such as at least one of an electronic circuit, an integrated circuit (chip) and a logic element. To facilitate signal processing and to save space, the processing means 30 may employ a microprocessor. Specifically, the processing device 30 may use a microprocessor such as a Central Processing Unit (CPU) or a single-chip Microcomputer (MCU) to implement its functions.
The processing device 30 receives the sensing signal output by the sensing element 10. Accordingly, the processing means 30 receives the sensing signal in the form of a voltage signal and processes the sensing signal. Specifically, the processing device 30 may read the sensing signal obtained by the sensing element 10. The processing device 30 calculates a trigger threshold corresponding to a preset trigger signal according to an initial sensing signal output by the sensing element 10. The trigger threshold may correspond to a certain preset voltage threshold, that is, a trigger voltage threshold. Preferably, to facilitate the signal processing, the processing device 30 sums the initial voltage value Vf corresponding to the sensed initial sensing signal with the preset constant voltage value Vc, so as to obtain the trigger voltage threshold Vt corresponding to the trigger signal.
Preferably, the processing means 30 comprise a computing unit 31. The calculation unit 31 sums the initial voltage Vf corresponding to the initial sensing signal with a preset voltage constant Vc, and obtains a trigger voltage threshold Vt corresponding to the trigger signal. The computing unit 31 may be implemented by a corresponding circuit such as an adder circuit, or by a component having a computing function.
Further, the processing device 30 further comprises a memory unit 33. The storage unit 33 is used for storing corresponding data, operation programs, and the like. In particular, the memory unit 33 may be used to store a voltage constant value. The voltage constant value Vc characterizes the voltage value increase of the sensing element 10 as the brake pedal 200 moves from the initial free position Lf to the trigger position Lt. The storage unit 33 may be a corresponding memory. For example, the memory unit 33 may be a single chip Microcomputer (MCU) self-contained memory.
In order to avoid that the sensing element 10 is triggered for calculation when not mounted to the brake pedal 200 and thus to obtain a not accurate "trigger voltage threshold", the processing means 30 further comprise a triggering unit 35. When the initial voltage value Vf corresponding to the initial sensing signal output by the sensing element 10 falls within the preset trigger voltage range V01-V02, the trigger unit 35 triggers the processing device 30 to calculate the trigger voltage threshold Vt. Accordingly, the preset trigger voltage range V01-V02 may be a voltage range configured for a voltage value generated by the sensor 101 when following the brake pedal 200 at an arbitrary position. That is, the voltage values that may be generated by the sensor 101 during the entire life cycle of the operation are included in the preset trigger voltage range V01-V02. The sensor 101 may be powered up due to incorrect operation, testing, etc., and the signal sensed by the sensing element 10 may not be a voltage signal when the brake pedal 200 is in a free state, and the "trigger threshold" based thereon is not accurate and does not meet the sensing accuracy requirement. Accordingly, the triggering unit 35 is configured to trigger the calculating unit 31 of the processing device 30 to perform calculation only when the voltage value corresponding to the sensing signal output by the sensing element 10 is within the preset trigger voltage range V01-V02, and not trigger the calculating unit 31 of the processing device 30 when the voltage value corresponding to the sensing signal is outside (smaller than or greater than) the preset trigger voltage range V01-V02. When the voltage value corresponding to the sensing signal output by the sensing element 10 is within the preset trigger voltage range V01-V02, the trigger unit 35 may output a high level signal; on the contrary, the trigger unit 35 outputs a low level signal. The triggering unit 35 may implement its function using a corresponding circuit, component or logic element. For example, the trigger unit 35 may be specifically configured by a trigger, a trigger circuit, or even a diode.
Accordingly, the preset trigger voltage range V01-V02 of the sensor 101 corresponds to the allowable range L01-L02 of the position of the brake pedal 200 within the tolerance range. Accordingly, the voltage signal sensed by the sensor 101 is linearly related to the position of the brake pedal 200. More specifically, the brake pedal 200 is preset to move a distance Lc. Accordingly, the predetermined movement distance Lc of the brake pedal 200 is a distance that the brake pedal 200 moves from the initial free position Lf to the trigger position Lt. The preset movement distance Lc of the brake pedal 200 may be set to a constant value, so that it is ensured that the sensor 101 is accurately triggered to emit a corresponding control signal when the brake pedal 200 is stepped on by a constant stroke (i.e., lc) at different initial (height) positions.
In order to make the trigger threshold value obtained when the sensor 101 is first mounted on the brake pedal 200 less susceptible to alteration, the processing device 30 further comprises a closing unit 37. The shut-off unit 37 is used to shut off the computing functions of the processing device 30. That is, when the processing device 30 calculates the trigger voltage threshold Vt, the turning-off unit turns off the calculation function of the processing device 30. Accordingly, the closing unit 37 may be a corresponding switching device, a switching circuit, a corresponding switching logic program, or even a component such as a fuse that breaks the physical structure of the computing unit 31. In this embodiment, the closing unit 37 prohibits reprogramming by setting a flag bit by using a singlechip, so that the sensor 101 is used to directly obtain the sensing signal after the first power-up, and the trigger smoke threshold Vt does not need to be obtained by calculating again.
Accordingly, when the brake pedal 200 moves to the preset trigger position Lt, the sensing unit 10 outputs a trigger signal. The processing means 30 receives the trigger signal and outputs a corresponding control signal. Specifically, the control signal corresponds to a voltage signal Vs. The control signal may be a binary signal. Accordingly, when the binary signal corresponding to the control signal is "0", the processing device 30 outputs a low level signal Vl. When the binary signal corresponding to the control signal is "1", the processing device 30 outputs a high level signal Vh. The binary signal output by the processing device 30 may be a brake light switch signal or an automobile start signal according to the application requirements. That is, the binary signal may be a switching signal that turns on or off a brake light; the binary signal may be a signal that the brake pedal 200 is stepped to a preset position and the vehicle is started.
In order to facilitate the processing of the corresponding binary signal by the processing means 30, the processing means 30 further comprise a comparison unit 39. The comparing unit 39 is configured to set a magnitude between a voltage value corresponding to the sensing signal output from the sensing element 10 and a voltage value corresponding to the trigger voltage threshold Vt. When the voltage value corresponding to the sensing signal is smaller than the voltage value corresponding to the trigger voltage threshold Vt, the sensor 30 outputs a low level signal; when the fixed voltage value of the sensing signal is greater than the voltage value corresponding to the trigger voltage threshold Vt, the sensor 30 outputs a high level signal. Accordingly, the high signal may be an effective value to trigger, for example, the brake light to conduct. The comparing unit 39 may implement its function with a corresponding circuit, a comparator, or a logic program depending on a single chip microcomputer, etc.
To facilitate the transmission of the corresponding electrical signals and to enhance the overall integrated performance of the sensor 101, the sensor 101 comprises a circuit board. The circuit board is used to support the processing device 30 and the sensing element 10. Correspondingly, the circuit board is electrically connected with the processing device 30 and the sensing element 10, and performs corresponding transmission of electric signals.
As a preferred embodiment, the trigger signal output by the processing device 30 is a switching signal for switching the brake lamp 400. Accordingly, to facilitate control of the on-off of, for example, brake lights 400, the sensor 101 further includes a drive unit 70. The driving unit 70 may be a corresponding driving circuit. The driving unit 70 receives the trigger signal, and turns on or off the brake lamp 400 according to the trigger signal.
In order to make the sensing element 10 and the processing device 30 stably work, the sensor 101 further includes a voltage stabilizing unit 60. Preferably, the sensor 101 receives a 12V supply voltage provided by an automobile. The voltage stabilizing unit 60 stabilizes the 12 supply voltage to 5V working voltage, and provides the working voltage to the hall chip as the sensing element 10 and the singlechip as the processing device 30. In this embodiment, the voltage stabilizing unit 60 includes a low dropout linear regulator (Low Dropout Regulator, LDO for short).
As an example, the working principle of the sensor 101 is further explained: the preset trigger voltage range V01-V02 of the sensor 101 may be 1-4V. Accordingly, the allowable range of positions (distance relative to a reference) L01-L02 for the brake pedal 200 tolerances is 10-40mm. The preset moving distance Lc of the brake pedal 200 is 20mm. Correspondingly, the preset constant voltage value Vc is 2V. The corresponding position Lf is 12mm when the brake pedal 200 is in the free state (first loading, not yet being stepped on), and the corresponding initial voltage value Vf obtained by the sensing element 10 is 1.2V, the corresponding trigger voltage threshold Vt calculated by the processing device 30 is calculated by 1.2v+2v summation to obtain 3.2V. That is, the sensor 101 obtains the corresponding trigger voltage threshold Vt through the first loading and power-up (electrical conduction forms an electrical loop) operation. Thereafter, when the brake pedal 200 is stepped on each time by a movement distance of 20mm (corresponding to a trigger position such as a brake position), the sensing element 10 outputs a trigger signal corresponding to a voltage value of 3.2V, and causes the processing device 30 to output a corresponding control signal, effecting a switching operation such as to the brake lamp 400.
As another example, when the corresponding position Lf is 15mm when the brake pedal 200 is in the free state (first loading, not yet stepped on), and the corresponding initial voltage value Vf obtained by the sensing element 10 is 1.5V, the corresponding trigger voltage threshold Vt calculated by the processing device 30 is calculated to be 3.5V by 1.5v+2v summation. That is, the sensor 101 obtains the corresponding trigger voltage threshold Vt through the first loading and power-up (electrical conduction forms an electrical loop) operation. Thereafter, each time the brake pedal 200 is stepped on for a movement distance of 20mm (corresponding to a trigger position such as a brake position), the sensing element 10 outputs a trigger signal corresponding to a voltage value of 3.5V, and causes the processing device 30 to output a corresponding control signal, effecting a switching operation such as to the brake lamp 400.
That is, regardless of the position (height) of the brake pedal 200 in which the initial free state is, when the brake pedal 200 moves a predetermined distance (corresponding to the trigger position), the sensor 101 is triggered and emits a corresponding control signal.
Embodiment two:
With continued reference to FIG. 1, the present invention also provides a sensor device 103 for a vehicle brake pedal. The sensor device 103 comprises a support 50, a magnetic element 300 and a sensor 101 according to the foregoing description.
The support 50 is used to support other structures of the sensor device 101. The support 50 may be used to fixedly mount the sensor device 101 to an automobile. The specific shape and configuration of the support 50 is sufficient to meet the support requirements. In this embodiment, the support 50 may be an injection molded housing.
The magnetic element 300 is stationary relative to the vehicle. The magnetic member 300 provides a magnetic field of a corresponding strength in three dimensions. Accordingly, the magnetic member 300 emits magnetic lines 308 in three dimensions. The type, specification and parameters of the magnetic member 300 may be any type, specification and parameters that can generate a magnetic field that can be sensed by the sensing element 10. The magnetic member 300 may be a magnet. Further, the magnetic member 300 may be a permanent magnet or an electromagnet. In this embodiment, the magnetic member 300 is a permanent magnet.
Embodiment III:
Referring to fig. 4, the present invention further provides a sensing method. The sensing method is used to sense the position of the brake pedal 200. The sensing method comprises the following steps:
s110: sensing the magnetic field strength when the brake pedal 200 is in an initial free state (initial state), and acquiring an initial sensing signal; the initial sensing signal corresponds to an initial voltage value Vf;
s120: calculating a trigger voltage threshold Vt according to the initial voltage value Vf; the trigger voltage threshold Vt corresponds to a trigger signal.
Accordingly, the sensing method may sense the magnetic field strength using the aforementioned sensing element 10 and obtain a corresponding initial sensing signal. It will be appreciated that the magnetic field strength at which the brake pedal 200 is in the initial free state may be the size strength of the space in which the brake pedal 200 itself is located, or the magnetic field strength of the space in which the sensing element 10 provided in association with the brake pedal 200 (the relative position is constant). The sensing element 10 outputs an initial sensing signal to the processing means 30 described above. The processing device 30 calculates a trigger voltage threshold Vt according to an initial voltage value Vf corresponding to the initial sensing signal. Specifically, the processing device 30 calculates Vt by: vf+vc (preset constant voltage value) =vt.
Referring to fig. 5, the sensing method preferably performs the following operations before calculating the trigger voltage threshold Vt:
S102: judging whether a voltage value corresponding to the sensing signal falls into a preset trigger voltage range V01-V02 or not;
s104: when the voltage value corresponding to the sensing signal falls within a preset trigger voltage range V01-V02, triggering the operation of calculating the trigger voltage threshold Vt.
Accordingly, the sensing method may adopt the corresponding judging unit 36 to judge whether the voltage value corresponding to the sensing signal falls within the preset trigger voltage range V01-V02, so as to avoid an error operation, and ensure that the sensor 101 can only perform the operation of calculating the trigger voltage threshold Vt when loading for the first time. At this time, the trigger unit 35, which is in communication (electrical) with the judgment unit 36, triggers an operation of the calculation unit 31 to calculate the trigger voltage threshold Vt. Accordingly, the trigger voltage threshold Vt may be stored in the corresponding memory cell 33.
Referring to fig. 6, the sensing method preferably performs the following operations after calculating the trigger voltage threshold Vt:
S112: the operation of recalculating the trigger voltage threshold Vt is turned off.
Accordingly, the sensing method may turn off the calculation function of the calculation unit 31 using the aforementioned turn-off unit 37. That is, after the sensor 101 is powered up for the first time and the trigger voltage threshold Vt is calculated, the operation of calculating the trigger voltage threshold Vt again is prohibited, so that the response speed of the subsequent sensing operation of the sensor 101 is improved. Preferably, the shut down unit 37 may read whether the trigger voltage threshold Vt is present in the memory cell 33. When the trigger voltage threshold Vt exists in the memory unit 33, the shutdown unit 37 performs a shutdown operation for recalculating the calculation unit 31.
Referring to fig. 7, the sensing method preferably performs the following operations after calculating the trigger voltage threshold Vt:
S130: the position of the brake pedal 200 is sensed, and a control signal is output according to the sensed trigger signal.
At this time, the brake pedal 200 moves to the trigger position, and the sensing element 10 senses the trigger signal corresponding to the trigger voltage threshold Vt; the trigger signal triggers the processing means 30 to output a control signal.
Referring to fig. 8, further preferably, the sensing method performs the following operations after calculating the trigger voltage threshold Vt:
s132: sensing a position of the brake pedal 200 and outputting a sensing signal;
S134: comparing the voltage value corresponding to the sensing signal with a trigger voltage threshold Vt;
S136a: outputting a first control signal when the voltage value corresponding to the sensing signal is smaller than the voltage value corresponding to the trigger voltage threshold Vt;
S136b: and outputting a second control signal when the voltage value corresponding to the sensing signal is larger than the voltage value corresponding to the trigger voltage threshold Vt.
At this time, the sensor 101 starts a sensing operation, and the sensing method may sense the corresponding position of the brake pedal 200 through the sensing element 10 and output a sensing signal. The processing device 30 receives the sensing signal and compares the voltage value corresponding to the sensing signal with the trigger voltage threshold Vt corresponding to the trigger signal through the comparing unit 39. Specifically, the comparison unit 39 may read the trigger voltage threshold Vt stored in the memory unit 33. Outputting a first control signal when a voltage value corresponding to the sensing signal is smaller than the trigger voltage threshold Vt; and outputting a first control signal when the voltage value corresponding to the sensing signal is larger than the trigger voltage threshold Vt. As an example, the first control signal may be a signal for turning off the brake lamp 400 or maintaining an off state of the brake lamp 400; the first control signal may be a signal to turn on the brake lamp 400 or to maintain the on state of the brake lamp 400.
The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions or improvements within the spirit of the present invention are intended to be covered by the claims of the present invention.

Claims (19)

1. A sensing device (103) for a vehicle brake pedal, characterized in that the sensing device comprises:
A sensing element (10) for sensing a magnetic field strength of the magnetic element (300) and outputting a sensing signal; when the sensing element (10) is arranged in linkage with the brake pedal (200) in a free state, the sensing element outputs an initial sensing signal; the initial sensing signal corresponds to an initial voltage value; and
A processing device (30) in communication with the sensing element (10) to receive the sensing signal output by the sensing element,
The processing device comprises a computing unit (31),
The calculating unit sums the initial voltage value corresponding to the initial sensing signal with a preset constant voltage value, and calculates to obtain a trigger voltage threshold;
the processing device comprises a comparison unit (39);
The comparison unit is used for comparing the voltage value corresponding to the sensing signal output by the sensing element with the trigger voltage threshold value;
when the voltage value corresponding to the sensing signal is smaller than the voltage value corresponding to the trigger voltage threshold, the sensing device outputs a first control signal;
When the voltage value corresponding to the sensing signal is larger than the voltage value corresponding to the trigger voltage threshold, the sensing device outputs a second control signal.
2. The sensing device of claim 1, wherein:
when the brake pedal moves to a preset trigger position, the sensing element outputs a trigger signal;
the processing means (30) receives the trigger signal and outputs the first control signal or the second control signal.
3. The sensing device of claim 2, wherein:
the control signal is a brake lamp switch signal or an automobile starting signal.
4. The sensing device of claim 1, wherein:
The first control signal is a low level signal;
the second control signal is a high level signal.
5. The sensing device of claim 1, wherein:
the processing device further comprises a memory unit (33);
the storage unit stores the preset constant voltage value and the trigger voltage threshold;
The computing unit is communicatively coupled to the storage unit.
6. The sensing device of claim 1, wherein:
the processing device also comprises a judging unit (36) and a triggering unit (35);
the judging unit receives a sensing signal output by the sensing element (10);
when the judging unit (36) judges that the voltage value corresponding to the sensing signal falls within a preset trigger voltage range, the triggering unit (35) triggers the calculating unit.
7. The sensing device of claim 1, wherein:
the processing device further comprises a closing unit (37);
The closing unit is in communication connection with the computing unit;
and after the calculation unit calculates the trigger voltage threshold, the closing unit closes the recalculation function of the calculation unit.
8. The sensing device of claim 1, further comprising:
A circuit board;
the sensing element (10) and the processing device (30) are both arranged on the circuit board and are electrically connected with the circuit board.
9. The sensing device according to any one of claims 1 to 8, wherein:
when the brake pedal moves, the sensing element outputs a linear trigger signal;
The first control signal and the second control signal are a switch signal.
10. The sensing device of claim 9, wherein:
the sensing element is a linear hall element.
11. The sensing device (103) of claim 1, further comprising:
And a magnetic element (300) for being arranged in conjunction with the brake pedal (200) and being arranged in a manner that can be moved closer to and farther away from the sensor (101).
12. The sensing device of claim 11, wherein:
the magnetic element is a magnet.
13. A sensor for a vehicle brake pedal, the sensor comprising:
a housing for mounting on a vehicle; and
A sensing element (10) for sensing a magnetic field strength of the magnetic element (300) and outputting a sensing signal;
When the sensing element (10) is arranged in linkage with the brake pedal (200) in a free state, the sensing element outputs an initial sensing signal; the initial sensing signal corresponds to an initial voltage value; the initial voltage value is used for determining a trigger voltage threshold of the sensor;
a processing device (30) in communication with the sensing element (10) to receive the sensing signal output by the sensing element,
The processing device comprises a computing unit (31),
The calculating unit sums the initial voltage value corresponding to the initial sensing signal with a preset constant voltage value, and calculates to obtain a trigger voltage threshold;
the processing device comprises a comparison unit (39);
The comparison unit is used for comparing the voltage value corresponding to the sensing signal output by the sensing element with the trigger voltage threshold value;
When the voltage value corresponding to the sensing signal is smaller than the voltage value corresponding to the trigger voltage threshold, the sensing device outputs a first control signal;
and when the voltage value corresponding to the sensing signal is larger than the voltage value corresponding to the trigger voltage threshold, the sensing device outputs a second control signal.
14. The sensor of claim 13, wherein:
when the brake pedal moves, the sensing element outputs a linear trigger signal;
The first control signal and the second control signal are a switch signal.
15. The sensor of claim 14, wherein:
the sensing element is a linear hall element.
16. A sensing method for sensing a position of a brake pedal, the sensing method comprising:
sensing the magnetic field intensity of the brake pedal in an initial free state, and acquiring an initial sensing signal; the initial sensing signal corresponds to an initial voltage value;
summing the initial voltage value and a preset constant voltage value, and calculating to obtain a trigger voltage threshold, wherein the trigger voltage threshold corresponds to a trigger signal;
sensing a position of a brake pedal (200) and outputting a sensing signal;
comparing the voltage value corresponding to the sensing signal with the trigger voltage threshold;
Outputting a first control signal when the voltage value corresponding to the sensing signal is smaller than the trigger voltage threshold value;
And outputting a second control signal when the voltage value corresponding to the sensing signal is larger than the trigger voltage threshold.
17. The sensing method of claim 16, wherein:
before the trigger voltage threshold is calculated, the following operations are performed:
judging whether a voltage value corresponding to the sensing signal falls into a preset trigger voltage range or not;
when the voltage value corresponding to the sensing signal falls into the trigger voltage range, triggering the operation of calculating the trigger voltage threshold.
18. The sensing method of claim 16, wherein:
after the trigger voltage threshold is calculated, the following operations are performed:
and closing the operation of recalculating the trigger voltage threshold.
19. The sensing method of claim 16, wherein:
after the trigger voltage threshold is obtained, the following operations are performed:
the position of the brake pedal (200) is sensed, and a corresponding control signal is output according to the sensed trigger signal.
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