CN107097643B - Non-contact accelerator pedal sensor system based on Hall effect - Google Patents
Non-contact accelerator pedal sensor system based on Hall effect Download PDFInfo
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- CN107097643B CN107097643B CN201710269592.0A CN201710269592A CN107097643B CN 107097643 B CN107097643 B CN 107097643B CN 201710269592 A CN201710269592 A CN 201710269592A CN 107097643 B CN107097643 B CN 107097643B
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- gasket
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
- B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
- B60K26/021—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements with means for providing feel, e.g. by changing pedal force characteristics
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- 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
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses a non-contact accelerator pedal sensor system based on Hall effect, which comprises a support fixed on a vehicle, a pedal rod hinged on the support through a pedal hinge shaft, a return spring connected with the pedal rod and the support and used for returning the pedal rod, one side of the support is provided with a pedal sensor based on a Hall effect, the pedal sensor is in driving connection with a pedal rod and converts the swing of the pedal rod into an electric signal to be output to an engine manager, so that the engine manager senses the operation of a driver on an accelerator in real time, and the power output is changed. The invention avoids the abrasion problem of the traditional accelerator pedal sensor, and greatly prolongs the service life while improving the precision.
Description
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a non-contact accelerator pedal sensor system based on a Hall effect.
Background
With the continuous popularization of automobiles in daily life, the dynamics, safety and comfort of the automobiles are getting more and more attention. These performance improvements have relied on the development of automotive electronic control systems. The accelerator pedal sensor is used as an important component of the electronic control system of the automobile, and the reliability and stability of the electronic control system of the whole automobile are directly affected by the performance of the accelerator pedal sensor.
The traditional accelerator pedal sensor adopts the potentiometer principle, and adopts thick film resistors or conductive plastics as resistor matrixes. When a driver steps on the accelerator, the electric brush is driven to move, and the relative position of the electric brush and the resistor matrix is changed. And judging the relative position of the electric brush by detecting the voltage change, and finally determining the rotation angle of the accelerator pedal.
However, the working environment of the automobile is relatively bad, and the accelerator pedal sensor needs to maintain good stability under high-temperature and vibration conditions. The brush and the resistor matrix of the traditional contact type resistor sensor are easy to wear, and the output characteristic and the service life of the sensor are seriously affected. In addition, the signal current allowed to pass through the resistor matrix is generally smaller, and specific electric connection components are required to be developed in the practical application process, so that the development cost is further increased.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the traditional contact pedal sensor has the problems of poor precision and short service life.
In order to solve the technical problems, the invention adopts the following technical scheme:
the non-contact accelerator pedal sensor system based on the Hall effect comprises a support fixed on a vehicle, a pedal rod hinged on the support through a pedal hinge shaft, and a return spring connected with the pedal rod and the support and used for returning the pedal rod, wherein one side of the support is provided with a pedal sensor based on the Hall effect, the pedal sensor is connected with the pedal rod in a driving way and converts the swing of the pedal rod into an electric signal to be output to an engine manager, so that the engine manager senses the operation of a driver on an accelerator in real time, and the power output is changed.
Further, the pedal sensor includes: the pedal comprises a sleeve, a bolt, a transmission connecting rod, a gasket, a shell, a cylindrical magnet, a circular circuit board and an end cover, wherein a gasket central flat hole is formed in the center of the gasket, a gasket eccentric hole is eccentrically formed in the edge of the gasket, one end of the bolt is movably connected with the gasket eccentric hole, and the sleeve is rotatably sleeved on the bolt and penetrates through an arc-shaped hole on one side of a support to be matched with a fork opening at the tail end of a pedal rod; the transmission connecting rod passes through the flat hole in the center of the gasket and is fixedly connected with one side of the shell, and the cylindrical magnet is centrally fixed on the other side of the shell and is used for converting an actual angle signal into a magnetic signal; the circular circuit board is fixed in the end cover and opposite to the cylindrical magnet, and is used for converting a magnetic signal into an electric signal and filtering the electric signal; the end cover is fixed on one side of the support through a fastening screw, and the wire harness of the circular circuit board is led out through the end cover and then connected with the engine manager.
Further, the transmission connecting rod sequentially comprises a cylindrical part, a positioning shaft shoulder and a driving part, the cross section shape of the driving part is matched with the shape of the flat hole in the center of the gasket, one side of the support is provided with a transmission connecting rod positioning hole, the cylindrical part is rotationally inserted into the transmission connecting rod positioning hole and is axially positioned by the positioning shaft shoulder, and one side of the shell is centrally provided with a shell connecting hole with the shape matched with the driving part.
Further, the circular circuit board comprises an angular position detection module and a signal filtering module, wherein the angular position detection module adopts an MLX90360 three-axis Hall effect chip.
Further, the cylindrical magnet is an N35SH neodymium-iron-boron cylindrical magnet, and the diameter is more than or equal to 4mm.
Further, the eccentricity of the cylindrical magnet rotating around the center of the cylindrical magnet relative to the center of the MLX90360 three-axis Hall effect chip is less than 0.2mm, and the problem of reduced accuracy of the accelerator pedal sensor caused by errors of a mechanical structure is solved.
Further, the distance between the front end face of the cylindrical magnet and the sensing part of the MLX90360 three-axis Hall effect chip is 2mm plus or minus 0.01mm, so that the problem of the decline of the accuracy of the accelerator pedal sensor caused by the error of a mechanical structure is solved.
Further, the center position error of the sensing part of the cylindrical magnet and the MLX90360 three-axis Hall effect chip is less than 0.1mm, and the problem of the decline of the precision of the accelerator pedal sensor caused by the error of a mechanical structure is solved.
Further, the error of the parallelism of the centers of the cylindrical magnet and the sensing part of the MLX90360 three-axis Hall effect chip is less than 0.1mm, so that the problem of the decline of the accuracy of the accelerator pedal sensor caused by the error of a mechanical structure is solved.
Further, the shell is made of PA 66A 218V20 engineering plastic, so that electromagnetic interference of the pedal sensor in the using process is reduced.
The invention introduces an MLX90360 three-axis Hall effect position sensor based on the traditional accelerator pedal sensor. The problems of easy abrasion, low precision and short service life of the traditional contact type accelerator pedal sensor are fundamentally solved. Meanwhile, the defects of complex layout and multiple wire harnesses of the capacitive sensor are overcome. And the error caused by unreasonable mechanical structure of the general non-contact Hall effect sensor is optimized. The precision can be improved to 0.4 degrees, the independent linearity can reach 1.05 percent, and the repeatability is high. The invention meets the requirements of the automobile pedal sensor and can provide accurate and reliable pedal travel measurement for an automobile engine manager in real time.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
FIG. 2 is a schematic diagram of an exploded structure of one embodiment of the present invention.
Figure 3 is a schematic diagram of the drive link configuration of one embodiment of the present invention.
FIG. 4 is a schematic diagram of a gasket construction according to one embodiment of the present invention.
Figure 5 is a schematic illustration of the support structure of one embodiment of the present invention.
Figure 6 is a schematic illustration of the housing structure of one embodiment of the present invention.
Fig. 7 is a schematic diagram of a circular circuit board structure according to an embodiment of the present invention.
FIG. 8 is a control flow diagram of an embodiment of the present invention.
FIG. 9 is a schematic circuit diagram of one embodiment of the present invention.
FIG. 10 is a schematic diagram of the relative positions of a cylindrical magnet and an MLX90360 three-axis Hall-effect chip in an initial condition of an embodiment of the invention.
In the figure: 1-pedal rod, 2-support, 21-arc hole, 22-transmission connecting rod positioning hole, 23-hinge hole, 24-screw hole, 25-spring positioning groove, 3-sleeve, 4-bolt, 5-transmission connecting rod, 51-cylinder part, 52-positioning shaft shoulder, 53-driving part, 6-gasket, 61-gasket eccentric hole, 62-gasket central hole, 7-shell, 71-shell connecting hole, 8-cylindrical magnet, 9-circular circuit board, 91-angular position detection module, 10-end cover, 11-fastening screw; 12-pedal hinge shaft and 13-return spring.
Detailed Description
In order to make the technical proposal and the advantages of the invention more prominent, the invention will now be clearly and completely described with reference to the accompanying drawings. Other examples, which may be made by those of ordinary skill in the art without undue burden from the present disclosure, are also within the scope of the present disclosure, based on the described embodiments of the present disclosure.
As shown in fig. 1 to 7, a hall effect-based non-contact accelerator pedal sensor system comprises a support 2 fixed on a vehicle, a pedal rod 1 hinged on the support 2 through a pedal hinge shaft 12, a return spring 13 connected with the pedal rod 1 and the support 2 and used for returning the pedal rod 1, wherein a hinge hole 23 and a spring positioning groove 25 are formed in the support 2, a hall effect-based pedal sensor is arranged on one side of the support 2, and is in driving connection with the pedal rod 1 and converts the swing of the pedal rod 1 into an electric signal to be output to an engine manager, so that the engine manager senses the operation of a driver on an accelerator in real time and changes the power output.
Specifically, the pedal sensor includes: the novel pedal rod comprises a sleeve 3, a bolt 4, a transmission connecting rod 5, a gasket 6, a shell 7, a cylindrical magnet 8, a circular circuit board 9 and an end cover 10, wherein a gasket center flat hole 62 is formed in the center of the gasket 6, a gasket eccentric hole 61 (see figure 4) is eccentrically formed in the edge of the gasket 6, one end of the bolt 4 is movably connected with the gasket eccentric hole 61, and the sleeve 3 is rotatably sleeved on the bolt 4 and penetrates through an arc-shaped hole 21 at one side of a support 2 to be matched with a fork opening at the tail end of the pedal rod 1; the transmission connecting rod 5 passes through the flat hole 62 in the center of the gasket and is fixedly connected with one side of the shell 7, and the cylindrical magnet 8 is centrally fixed on the other side of the shell 7 and is used for converting an actual angle signal into a magnetic signal; the circular circuit board 9 is fixed in the end cover 10 and is opposite to the cylindrical magnet 8, and is used for converting a magnetic signal into an electric signal, filtering the electric signal, and selecting a 6V direct current rechargeable power supply as a power supply; the end cover 10 is fixed on one side of the support 2 through a fastening screw, and the wire harness of the circular circuit board 9 is led out through the end cover 10 and then connected with the engine manager.
As shown in fig. 3, the transmission link 5 sequentially includes a cylindrical portion 51, a positioning shoulder 52, and a driving portion 53, a cross-sectional shape of the driving portion 53 is matched with a shape of a flat hole 62 in the center of the gasket, a transmission link positioning hole 22 is provided on one side of the support 2, the cylindrical portion 51 is rotatably inserted into the transmission link positioning hole 22 and is axially positioned by the positioning shoulder 52, and a housing connection hole 71 having a shape matched with the driving portion 53 is centrally provided on one side of the housing 7.
As shown in fig. 7, the circular circuit board 9 includes an angular position detection module 91 and a signal filtering module, and the angular position detection module adopts an MLX90360 three-axis hall effect chip.
The cylindrical magnet 8 in this embodiment is an N35SH neodymium-iron-boron cylindrical magnet, and has a size D6H1. If an alternative is needed, the magnetic induction intensity of the space excitation is not higher than 70mT and not lower than 20mT.
The accuracy of the mechanical assembly can bring no small influence to the measurement of the whole angle, especially the position of the magnet in the rotation process, and the accuracy of the whole sensor is more important, so that the eccentricity of the rotation of the cylindrical magnet 8 around the center of the cylindrical magnet relative to the center of the MLX90360 three-axis Hall effect chip is less than 0.2mm; the distance between the front end face of the cylindrical magnet 8 and the sensing part of the MLX90360 three-axis Hall effect chip is 2mm plus or minus 0.01mm; the error of the center position of the sensing part of the cylindrical magnet 8 and the MLX90360 three-axis Hall effect chip is less than 0.1mm; the error of the parallelism of the centers of the cylindrical magnet 8 and the sensing part of the MLX90360 three-axis Hall effect chip is less than 0.1mm, so that the problem of the decline of the accuracy of the accelerator pedal sensor caused by the error of a mechanical structure is solved.
Meanwhile, the shell 7 is made of PA 66A 218V20 engineering plastic, so that electromagnetic interference of the pedal sensor in the using process is reduced.
The specific principle is as follows: in the driving process, when a driver presses an accelerator pedal, the pedal rod 1 rotates around a pedal hinge shaft 12 connected with the support 2, a fork opening at the tail end of the pedal rod 1 transmits a rotating angle to the gasket 6 through the sleeve 3 and the bolt 4, the rotation of the gasket 6 drives the transmission connecting rod 5 to drive the cylindrical magnet 8 embedded in the shell 7 to rotate, and the circular circuit board 9 is fixedly connected with the end cover 10 and fixed on one side of the support 2 through the fastening screw 11. When the cylindrical magnet 8 is rotated, the MLX90360 three-axis Hall effect chip on the circuit board parallel to the cylindrical magnet 8 detects the change of magnetic induction intensity and converts the magnetic induction intensity into an electric signal, and the electric signal is output to an engine manager in an analog quantity mode after being filtered, so that the engine manager senses the operation of a driver on an accelerator in real time, and the power output is changed.
FIG. 8 is a schematic workflow diagram of an embodiment of the invention, including the steps of:
s11: the accelerator pedal is depressed;
s12: driving the cylindrical magnet 8 to rotate;
s13: the angular position measurement module 91 senses the angular change;
s14: analog quantity mode output.
The step S13 specifically includes: the magnetic field change parallel to the chip surface is captured by the magnetic field collecting material of the MLX90360 three-axis hall effect chip, and two components in two perpendicular directions proportional to the magnetic field strength are generated, and then the two signals are detected by two pairs of conventional planar hall elements which are perpendicular to each other and parallel to the chip surface.
The step S14 specifically includes: and (3) encoding the two signals obtained in the step (S13) into two sine and cosine signals with the phase difference of 90 degrees, amplifying and sampling the sine and cosine signals, converting the sine and cosine signals into digital signals, calculating an angle value through an arctangent function by the two digital signals, and obtaining analog output through a digital-to-analog converter by the digital signal representing the current angle value.
Fig. 9 is a circuit diagram of the present embodiment, in which the MLX90360 three-axis hall effect chip has a high integration level, and only simple filtering of the analog signal is required at the periphery.
Fig. 10 shows the relative positional relationship between the cylindrical magnet 8 and the MLX90360 three-axis hall effect chip in the initial condition of the present embodiment, in which the accelerator pedal sensor is at electrical 0 degrees.
As a preferred embodiment, the MLX90360 three-axis Hall effect chip is calibrated using a 16-point calibration method using a PTC-04 programming tool provided by Michael core corporation, the detailed operation being as follows: after connecting the MLX90360 chip and the PTC-04, connecting the PTC-04 to a computer, and selecting the corresponding chip type. Firstly, setting an output mode, an output angle mapping field, a clamping low level proportion, a clamping high level proportion, a starting angle and a filtering mode. And then automatically setting the gain through the DAC. Finally 16-point programming is selected.
In the driving process, when a driver presses an accelerator pedal, the pedal rod drives the cylindrical magnet at the front end of the sensor shaft to rotate. The chip on the circuit board parallel to the front end face can detect the change of magnetic induction intensity and convert the change into an electric signal. And the filtered signals are output to an engine manager in an analog mode. Therefore, the engine manager senses the operation of the driver on the accelerator in real time, and the power output is changed.
The above-described example is merely illustrative of the features of the present invention for clarity and is not intended to limit other embodiments. Various modifications may be made by the skilled person based on the inventive idea. It is not intended to be exhaustive or to limit the invention to any precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention.
Claims (9)
1. The utility model provides a non-contact accelerator pedal sensor system based on hall effect, includes support (2) fixed on the car, articulates through footboard hinge (12) pedal pole (1) on support (2), connects return spring (13) that are used for pedal pole (1) return in pedal pole (1) and support (2), its characterized in that:
one side of the support (2) is provided with a pedal sensor based on a Hall effect, the pedal sensor is in driving connection with the pedal rod (1) and converts swing of the pedal rod (1) into an electric signal to be output to an engine manager, so that the engine manager senses the operation of a driver on an accelerator in real time and changes the power output;
the pedal sensor includes:
the novel pedal rod comprises a sleeve (3), a bolt (4), a transmission connecting rod (5), a gasket (6), a shell (7), a cylindrical magnet (8), a circular circuit board (9) and an end cover (10), wherein a gasket central flat hole (62) is formed in the center of the gasket (6), a gasket eccentric hole (61) is eccentrically formed in the edge of the gasket, one end of the bolt (4) is movably connected with the gasket eccentric hole (61), and the sleeve (3) is rotatably sleeved on the bolt (4) and penetrates through an arc-shaped hole (21) on one side of a support (2) to be matched with a fork opening at the tail end of the pedal rod (1); the transmission connecting rod (5) passes through a flat hole (62) in the center of the gasket and is fixedly connected with one side of the shell (7), the cylindrical magnet (8) is centrally fixed on the other side of the shell (7), when an accelerator pedal is depressed, the pedal rod (1) rotates around a pedal hinge shaft (12) connected with the support (2), a fork opening at the tail end of the pedal rod (1) transmits a rotating angle to the gasket (6) through the sleeve (3) and the bolt (4), and the rotation of the gasket (6) enables the transmission connecting rod (5) to drive the cylindrical magnet (8) embedded in the shell (7) to rotate; the circular circuit board (9) is fixed in the end cover (10) and is opposite to the cylindrical magnet (8) and is used for converting a magnetic signal into an electric signal and filtering the electric signal; the end cover (10) is fixed on one side of the support (2) through a fastening screw (11), and the wire harness of the circular circuit board (9) is led out through the end cover (10) and then connected with the engine manager.
2. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the transmission connecting rod (5) sequentially comprises a cylindrical part (51), a positioning shaft shoulder (52) and a driving part (53), the cross section shape of the driving part (53) is matched with the shape of a flat hole (62) in the center of the gasket, one side of the support (2) is provided with a transmission connecting rod positioning hole (22), the cylindrical part (51) is rotationally inserted into the transmission connecting rod positioning hole (22) and is axially positioned by the positioning shaft shoulder (52), and one side of the shell (7) is centrally provided with a shell connecting hole (71) with the shape matched with the driving part (53).
3. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the circular circuit board (9) comprises an angular position detection module and a signal filtering module, wherein the angular position detection module adopts an MLX90360 three-axis Hall effect chip.
4. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the cylindrical magnet (8) is an N35SH neodymium-iron-boron cylindrical magnet, and the diameter is more than or equal to 4mm.
5. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the eccentricity of the cylindrical magnet (8) rotating about its centre is <0.2mm relative to the centre of the MLX90360 three-axis hall effect chip.
6. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the distance between the front end face of the cylindrical magnet (8) and the sensing part of the MLX90360 three-axis Hall effect chip is 2mm plus or minus 0.01mm.
7. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the error of the center position of the sensing part of the cylindrical magnet (8) and the MLX90360 three-axis Hall effect chip is less than 0.1mm.
8. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the error of the central parallelism of the cylindrical magnet (8) and the sensing part of the MLX90360 three-axis Hall effect chip is less than 0.1mm.
9. A hall effect based non-contact accelerator pedal sensor system in accordance with claim 1, wherein: the shell (7) is made of PA 66A 218V20 engineering plastic.
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| CN201710269592.0A CN107097643B (en) | 2017-04-24 | 2017-04-24 | Non-contact accelerator pedal sensor system based on Hall effect |
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| CN201710269592.0A CN107097643B (en) | 2017-04-24 | 2017-04-24 | Non-contact accelerator pedal sensor system based on Hall effect |
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| CN107097643B true CN107097643B (en) | 2023-06-20 |
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| CN108489378A (en) * | 2018-01-25 | 2018-09-04 | 深圳市傲睿智能科技有限公司 | A kind of magnetic sensitive angle sensor |
| CN109115148B (en) * | 2018-09-27 | 2023-05-16 | 长春一东离合器股份有限公司 | Automobile pedal travel testing device |
| CN109895628A (en) * | 2019-03-20 | 2019-06-18 | 李春艳 | A kind of non-contact electronic acceleration pedal |
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| CN101412372B (en) * | 2008-11-20 | 2011-08-10 | 四川红光汽车机电有限公司 | Non-contacting intelligent electric throttle |
| US8884612B2 (en) * | 2010-03-23 | 2014-11-11 | Williams Controls, Inc. | Configurable non-contact position sensor |
| CN102795107B (en) * | 2012-08-27 | 2015-08-26 | 珠海英搏尔电气有限公司 | Electronic throttle assembly |
| US9459649B2 (en) * | 2013-03-15 | 2016-10-04 | Cts Corporation | Active force pedal assembly |
| CN207207747U (en) * | 2017-04-24 | 2018-04-10 | 华南理工大学 | A kind of contactless accelerator pedal sensor system based on Hall effect |
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