阅读说明：本技术 一种电子换档器位置识别设计的方法 (Method for position identification design of electronic gear shifter ) 是由 吴志 顾书东 文习斌 王进昌 程志勇 于 2020-12-01 设计创作，主要内容包括：本发明涉及一种电子换档器位置识别设计的方法,包括：确认有效角度范围；设计档位识别布局；档位零点确定；档位识别点验证；整车上位置识别策略。本发明明确了旋钮式电子换档器档位识别布局方案,采用相对零点算法概念,准确完成芯片对位置的识别,完成物理角度行程到数值量AD值的转换,为换档命令可靠执行奠定基础。(The invention relates to a method for identifying and designing positions of an electronic gear shifter, which comprises the following steps: confirming an effective angle range; designing a gear identification layout; determining a zero point of a gear; verifying a gear identification point; and (5) identifying the position of the whole vehicle. The invention defines the gear identification layout scheme of the knob type electronic gear shifter, adopts the concept of relative zero algorithm, accurately identifies the position by the chip, completes the conversion from physical angle travel to the numerical value AD value and lays a foundation for the reliable execution of the gear shifting command.)

1. A method of electronic shifter position identification design, comprising:

s1, confirming the effective angle or displacement range:

identifying a gear shifting instruction through a gear shifting module, communicating according to the gear shifting instruction and acquiring position information so as to confirm an effective angle or displacement range;

s2, designing gear identification layout:

the digital quantity value of each gear shifting stroke is obtained through linear calculation according to each gear shifting stroke, and the digital quantity value of each gear shifting stroke is divided to form a gear identification layout diagram;

s3, gear zero point determination:

selecting a point close to the left side of the gear error area as a relative zero point through a gear identification layout, recalculating the initial AD value of each gear position point by taking the relative zero point as a reference to obtain a relative AD value and a relative angle value or a relative displacement value, and completing gear identification calibration;

s4, gear identification point verification:

the diagnosis service under the extension session checks the calibration value, the qualified check represents that the position identification is successful, if the check is unqualified, the physical position of the gear point has deviation, and the operation precision of the gear point of the physical position needs to be improved;

s5, position identification strategy on the whole vehicle:

when the whole vehicle is powered on, the electronic gear shifter starts to work, the sensor can continuously detect the magnetic flux value, the magnetic flux physical quantity is converted into a digital quantity value and is sent to a main chip of the electronic gear shifter through serial communication, and the main chip receives the digital quantity value, compares and judges the digital quantity value with an original gear calibration value and a corresponding gear identification area, and finishes gear shifting gear identification; and measures for judging logic conditions of the gear shifting signal request of the user are finally converted into signals to be sent to the whole vehicle network.

2. The method of claim 1, wherein the sensing system of the knob-type electronic shifter includes a sensor and a cylindrical magnet, the user's shift intention is reflected on the electronic shifter, the angular change of the knob is transmitted to the rotation angle of the cylindrical magnet through a mechanical structure corresponding to the angular operation of the knob, the sensor detects the change of the magnetic flux to obtain the Hall digital quantity AD, and the conversion of the mechanical shift signal into the electronic signal is completed.

3. The method of claim 2, wherein the AD value read by the shift module in S1 represents a specific angle of 0-360 °, the range of the total effective physical quantity stroke of the magnet rotation is obtained by the left and right limit angular strokes of the knob and the corresponding transmission ratio of the knob to the magnet, and the range of the digital quantity AD value of the effective shift stroke corresponding to the angular stroke is the effective gear identification range.

4. The method of electronic shifter position identification design according to claim 2, wherein the gear identification layout formed in S2 includes gear identification zones, gear vacuum zones, and gear error zones.

5. The method of electronic shifter position identification design of claim 1, wherein the relative zero confirmation method in S3 is: and selecting one point in the shift error area as a relative zero point, wherein the selection of the point requires that the actual stroke is limited on the left side and is offset by a certain value Y, and the offset value Y is less than or equal to 1/2 times of the AD value of the error area, so that the relative 0 point and the effective identification area are prevented from being overlapped.

6. The method of electronic shifter position identification design of claim 5, wherein in S3 the gear identification calibration method specifically includes:

a) the shifter is operated to each gear position point through a manipulator, the left limit position and the right limit position are included, the number of the gear positions is assumed to be N, initial AD actual values corresponding to the N gear positions are read, and the left limit AD value is assumed to be A0;

b) calculating the relative zero AD value as A0-Y according to a relative zero algorithm, taking the relative zero as the coordinate starting point of the AD value, and subtracting (A0-Y) from the initial AD actual value read from each gear position point to obtain the AD relative value corresponding to each gear position point;

c) and writing the converted AD angle relative value of each gear point into Eeprom through UDS, wherein the 5 written AD values are called a calibration AD value.

7. The method of electronic shifter position recognition design of claim 6, wherein in S3, after gear recognition calibration, the gear position AD recognition area determination method is: setting the length of an AD value range of each gear point identification area as L, and setting the L value as the difference between the calibrated AD values of two adjacent gear points, wherein the range of +/-L/X corresponding to each calibrated AD value is used as the AD value identification area of the gear point, and the X value is between 3 and 5 according to the precision requirement and is calibrated according to the actual requirement; the AD identification areas of all gears are called effective gear shifting areas, and the areas in the left and right limit strokes except the effective gear shifting areas are gear shifting vacuum areas.

8. The method of electronic shifter position identification design according to claim 1, wherein the process of the master chip performing shift gear identification in S5 includes: when the user does not operate the gear shifter, the electronic gear shifter is supposed to be located at the original point, the sensor reads the digital quantity value corresponding to the original point, converts the digital quantity value into a relative digital quantity value and then transmits the relative digital quantity value to the main chip through serial communication, and the main chip receives the digital quantity value and processes the digital quantity value corresponding to the calibrated digital quantity value into a gear which is not operated by the user; when the converted digital quantity value received by the main chip is not in the gear identification area of the original point, whether the converted digital quantity value is not in the gear identification area of the original point for a long time needs to be judged, if so, whether the digital quantity value is in a gear dislocation error area is further judged, and if so, the main chip considers that the gear identification module has a fault; if not, the main chip resolves that the current shifter position is stuck in other gear identification zones or a gear shifting vacuum zone.

9. The method of electronic shifter position identification design according to claim 1, wherein the process of the master chip performing shift gear identification in S5 includes: when a user operates the gear shifter, the main chip compares the received digital quantity value with the digital quantity identification area of each gear, and when the current digital quantity value is in the digital quantity identification area, the main chip considers that the user performs the gear shifting operation; and in order to distinguish the process file site and the target file site of the user, the time that the digital value received by the main chip is in the digital value identification area is more than or equal to the preset calibration time, the main chip is considered as the target file site of the user, otherwise, the main chip is processed into the process file site, and the position is not identified.

Technical Field

The invention relates to the technical field of electronic design of a gear shifter, in particular to a position identification design method of an electronic gear shifter.

Background

With the continuous progress and development of modern automobile technology, as the electronic gear shifter is the premise and the basis of intelligent driving technologies such as automatic parking, remote starting, automatic P returning, auxiliary driving and the like, a plurality of mechanical control gear shifting mechanisms on automobiles are replaced by electronic control, the mechanical cable connection between the traditional gear shifter and a transmission is cancelled, and the gear shifting is completed directly through the electronic control. The electronic transducer of the gear shifter does not separate the conversion of the position signal, which is mainly accomplished by the gear shifting module.

The gear shifting module is used for recognizing a gear shifting instruction of a user, and mainly comprises a sensor and a magnet, an angle or displacement value rotated by a magnet N-S parting line of the gear shifting module relative to a Hall chip is converted into an AD (analog signal is converted into a digital signal value, and the digital value is converted after the sensor recognizes magnetic flux) value of the sensor, AD data is transmitted to a main chip through an SPI (serial peripheral interface) protocol, the main chip and the sensor are synchronously communicated, and therefore data exchange is completed), and the main chip obtains position information and completes conversion from a gear shifting mechanical signal to an electronic signal.

For an electronic gear shifter, a set of method needs to be designed to complete gear shifting position identification, and the problems of out-of-range crossing of 0 point, disordered gear shifting sequence, gear shifting failure identification or wrong gear shifting identification and the like can be caused if the method is not good.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for identifying and designing the position of an electronic gear shifter, aiming at the defects in the prior art, the method introduces a relative zero algorithm concept, can accurately complete the position identification and the initialization of an AD value by a chip, determines the identification range of each gear and the gear switching sequence, and lays a foundation for the accurate identification of an electronic gear shifting command.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a method of electronic shifter position identification design, comprising:

s1, confirming the effective angle or displacement range:

identifying a gear shifting instruction through a gear shifting module, communicating according to the gear shifting instruction and acquiring position information so as to confirm an effective angle or displacement range;

s2, designing gear identification layout:

the digital quantity value of each gear shifting stroke is obtained through linear calculation according to each gear shifting stroke, and the digital quantity value of each gear shifting stroke is divided to form a gear identification layout diagram;

s3, gear zero point determination:

selecting a point close to the left side of the gear error area as a relative zero point through a gear identification layout, recalculating the initial AD value of each gear position point by taking the relative zero point as a reference to obtain a relative AD value and a relative angle value or a relative displacement value, and completing gear identification calibration;

s4, gear identification point verification:

the diagnosis service under the extension session checks the calibration value, the qualified check represents that the position identification is successful, if the check is unqualified, the physical position of the gear point has deviation, and the operation precision of the gear point of the physical position needs to be improved;

s5, position identification strategy on the whole vehicle:

when the whole vehicle is powered on, the electronic gear shifter starts to work, the sensor can continuously detect the magnetic flux value, the magnetic flux physical quantity is converted into a digital quantity value and is sent to a main chip of the electronic gear shifter through serial communication, and the main chip receives the digital quantity value, compares and judges the digital quantity value with an original gear calibration value and a corresponding gear identification area, and finishes gear shifting gear identification; and measures for judging logic conditions of the gear shifting signal request of the user are finally converted into signals to be sent to the whole vehicle network.

In the above scheme, for the knob type electronic gear shifter, the sensing system comprises the sensor and the cylindrical magnet, the gear shifting intention of the user is reflected on the electronic gear shifter, the angle operation of the knob is corresponded, the angle change of the knob is transmitted to the rotation angle of the cylindrical magnet through the mechanical structure, the sensor detects the change of the magnetic flux to obtain the Hall digital quantity AD value, and then the conversion from the mechanical gear shifting signal to the electronic signal is completed.

In the scheme, the AD value read by the gear shifting module in the S1 represents a specific angle of 0-360 degrees, the total effective physical quantity stroke range of the magnet rotation is obtained through the left and right limit angle strokes of the knob and the transmission ratio of the corresponding knob and the corresponding magnet, and the digital quantity AD value range of the effective gear shifting stroke corresponding to the angle stroke is the effective gear identification range.

In the above scheme, the shift position identification layout formed in S2 includes a shift position identification region, a shift position vacuum region, and a shift position error region.

In the foregoing solution, the method for confirming the relative zero point in S3 is as follows: and selecting one point in the shift error area as a relative zero point, wherein the selection of the point requires that the actual stroke is limited on the left side and is offset by a certain value Y, and the offset value Y is less than or equal to 1/2 times of the AD value of the error area, so that the relative 0 point and the effective identification area are prevented from being overlapped.

In the foregoing solution, in S3, the gear identification calibration method specifically includes:

a) the shifter is operated to each gear position point through a manipulator, the left limit position and the right limit position are included, the number of the gear positions is assumed to be N, initial AD actual values corresponding to the N gear positions are read, and the left limit AD value is assumed to be A0;

b) calculating the relative zero AD value as A0-Y according to a relative zero algorithm, taking the relative zero as the coordinate starting point of the AD value, and subtracting (A0-Y) from the initial AD actual value read from each gear position point to obtain the AD relative value corresponding to each gear position point;

c) and writing the converted AD angle relative value of each gear point into Eeprom through UDS, wherein the 5 written AD values are called a calibration AD value.

In the above scheme, in S3, after gear identification calibration, the method for determining the AD identification area of the gear position point is as follows: setting the length of an AD value range of each gear point identification area as L, and setting the L value as the difference between the calibrated AD values of two adjacent gear points, wherein the range of +/-L/X corresponding to each calibrated AD value is used as the AD value identification area of the gear point, and the X value is between 3 and 5 according to the precision requirement and is calibrated according to the actual requirement; the AD identification areas of all gears are called effective gear shifting areas, and the areas in the left and right limit strokes except the effective gear shifting areas are gear shifting vacuum areas.

In the above solution, the process of identifying the shift position by the main chip in S5 includes: when the user does not operate the gear shifter, the electronic gear shifter is supposed to be located at the original point, the sensor reads the digital quantity value corresponding to the original point, converts the digital quantity value into a relative digital quantity value and then transmits the relative digital quantity value to the main chip through serial communication, and the main chip receives the digital quantity value and processes the digital quantity value corresponding to the calibrated digital quantity value into a gear which is not operated by the user; when the converted digital quantity value received by the main chip is not in the gear identification area of the original point, whether the converted digital quantity value is not in the gear identification area of the original point for a long time needs to be judged, if so, whether the digital quantity value is in a gear dislocation error area is further judged, and if so, the main chip considers that the gear identification module has a fault; if not, the main chip resolves that the current shifter position is stuck in other gear identification zones or a gear shifting vacuum zone.

In the above solution, the process of identifying the shift position by the main chip in S5 includes: when a user operates the gear shifter, the main chip compares the received digital quantity value with the digital quantity identification area of each gear, and when the current digital quantity value is in the digital quantity identification area, the main chip considers that the user performs the gear shifting operation; and in order to distinguish the process file site and the target file site of the user, the time that the digital value received by the main chip is in the digital value identification area is more than or equal to the preset calibration time, the main chip is considered as the target file site of the user, otherwise, the main chip is processed into the process file site, and the position is not identified.

The invention has the beneficial effects that:

the method for identifying and designing the position of the electronic gear shifter defines a gear identification layout scheme of the electronic gear shifter, adopts a relative zero algorithm concept, accurately completes the identification of the position by a chip, completes the conversion from a physical angle stroke to a numerical value AD value, and lays a foundation for the reliable execution of a gear shifting command.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a layout diagram of gear identification in an embodiment of the method of the present invention;

FIG. 2 is a schematic diagram of the conversion of original coordinate data to a new coordinate system in an embodiment of the method of the present invention;

fig. 3 is a schematic illustration of a gear identification zone in an embodiment of the method of the invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The invention provides a method for identifying and designing the position of an electronic gear shifter, which comprises the following steps:

s1, confirming the effective angle or displacement range:

identifying a gear shifting instruction through a gear shifting module, communicating according to the gear shifting instruction and acquiring position information so as to confirm an effective angle or displacement range;

s2, designing gear identification layout:

the digital quantity value of each gear shifting stroke is obtained through linear calculation according to each gear shifting stroke, and the digital quantity value of each gear shifting stroke is divided to form a gear identification layout diagram;

s3, gear zero point determination:

selecting a point close to the left side of the gear error area as a relative zero point through a gear identification layout, recalculating the initial AD value of each gear position point by taking the relative zero point as a reference to obtain a relative AD value and a relative angle value or a relative displacement value, and completing gear identification calibration;

s4, gear identification point verification:

the diagnosis service under the extension session checks the calibration value, the qualified check represents that the position identification is successful, if the check is unqualified, the physical position of the gear point has deviation, and the operation precision of the gear point of the physical position needs to be improved;

s5, position identification strategy on the whole vehicle:

when the whole vehicle is powered on, the electronic gear shifter starts to work, the sensor can continuously detect the magnetic flux value, the magnetic flux physical quantity is converted into a digital quantity value and is sent to a main chip of the electronic gear shifter through serial communication, and the main chip receives the digital quantity value, compares and judges the digital quantity value with an original gear calibration value and a corresponding gear identification area, and finishes gear shifting gear identification; and measures for judging logic conditions of the gear shifting signal request of the user are finally converted into signals to be sent to the whole vehicle network.

The method of the present invention for identifying an electronic shifter position is described in detail below with reference to a knob type shifter as an example. It should be noted that this embodiment does not limit the method of the present invention, and other types of shifters, such as shift levers, etc., are different only in physical signals (such as displacement amount, swing angle, etc.), and the method is versatile.

The knob type electronic gear shifter generally adopts a sensing system consisting of a sensor and a cylindrical magnet, and the process of mechanically converting an electronic signal of the knob type electronic gear shifter is as follows: the gear shifting intention of a user is embodied on the electronic gear shifter, corresponding to the angle operation of the knob, the angle change of the knob is transmitted to the rotation angle of the cylindrical magnet through the mechanical structure, the sensor detects the change of the magnetic flux to obtain the Hall digital quantity AD value, and then the conversion from the mechanical gear shifting signal to the electronic signal is completed.

The present embodiment is directed to a knob-type electronic shifter for a certain item, which has 4 strokes (i.e. there are 5 shift positions: left 2, left 1, origin, right 1, and right 2), which are respectively a left first-order stroke 22.5 °, a left second-order stroke 22.5 °, a right first-order stroke 22.5 °, and a right second-order stroke 22.5 °, and the transmission ratio of the knob to the magnet is 25: 9.

in this embodiment, a method of electronic shifter position identification design includes:

s1, confirming the effective angle range:

the gear shifting module is responsible for recognizing a gear shifting instruction of the knob, communicates with the MLX90363 chip through an SPI (serial peripheral interface) protocol and acquires position information, the read AD value information is a certain value of 0x 0000-0 x3FFF and represents a specific angle of 0-360 degrees, and the physical meaning of the gear shifting module is that the N-S division line of the magnet rotates relative to the Hall chip, namely the angle is 0-16384 according to the digital quantity AD value range corresponding to the 0-360 degree angle physical quantity range of the cylindrical magnet. The left and right limit angle travel of the knob is 90 degrees and the corresponding mechanism transmission ratio is 25: 9, obtaining the total effective physical quantity angular travel of the cylindrical magnet for rotating to be 250 degrees, wherein the corresponding digital quantity AD value range of the effective gear shifting travel is 0-11378, and the AD value range is the effective gear identification range value.

S2, designing gear identification layout:

as each gear shifting stroke of the knob is 22.5 degrees, the AD value of the digital quantity of each gear shifting stroke is 2284.5 through linear calculation, the AD value of each gear shifting stroke is divided into 5 points (which can be calibrated), 1 part of the periphery of each gear shifting point is divided into identification areas of gears, the AD value corresponding to the identification area of each gear shifting point is 913.8, the rest of each gear shifting stroke is divided into gear vacuum areas, the stroke AD value of the vacuum area is 1370.7, the range of the ineffective gear shifting stroke is divided into error areas, the stroke AD value of the error areas is 5006.2, and the formed gear shifting identification layout diagram is shown in figure 1.

S3, gear zero point determination:

in the assembling process of the gear shifter, the installation angle of the magnet is optional, therefore, calibrated data can be optional in the range of 0-360 degrees, in order to solve the problem of crossing 0 point and crossing the boundary, a relative zero point algorithm is introduced, firstly, a relative zero point is selected, then gear identification is calibrated according to the relative zero point algorithm, the calibrated data and real-time data read later are converted into numerical values in the range of [0,360], and the larger the numerical value is, the more the represented actual position is on the right.

In this embodiment, the relative zero point is selected to be the left side of the left 2 actual value, that is, in the error region, the difference between the AD value of the relative 0 point and the left 2 gear point is specified to be 2000, the AD value of 2000 can be specifically calibrated, and the value is generally equal to or less than 1/2 times of the AD value of the error region, so that the relative 0 point and the left 2 gear point identification region are prevented from being overlapped, and meanwhile, the right 2 gear point identification region is not required to be entered, and the simple schematic flow description is shown in fig. 2.

The gear identification and calibration method comprises the following steps:

a) the shifter is rotated to the extreme positions (left 2, left 1, origin, right 1 and right 2) of 5 shift positions, and initial AD actual values corresponding to the 5 shift positions can be obtained;

b) subtracting 2000AD value from the actual AD value of the specified left 2 gear position point to obtain a relative 0 point, and recalculating according to the AD value 2284.5 between each gear position point by using the relative 0 point as the coordinate starting point of the AD value to obtain new AD relative values corresponding to 5 gear position points;

c) and writing the converted AD angle relative values of the 5 gear points into an EEPROM (electrically erasable programmable read-only memory) through a UDS (secure access diagnostic service under an extended session), wherein the 5 written AD values are called as a calibration AD value.

After gear identification calibration, determining an AD identification area of a gear position: it is mentioned above that the length of the AD value range of each gear point identification region is 913.8, the corresponding ± 456.9 ranges of the 5 calibration AD values are used as the AD value identification regions of the gear point, for example, the calibration AD value of the left 2 gear site is 2000, the AD number identification range of the left 2 gear site is 2000 ± 456.9, that is, the AD values 1543.1-2456.9 are the left 2 shift identification regions identified by the main chip, and the AD identification regions of each gear site are shown in the "-2, -1, 0, +1, + 2" part in fig. 3.

S4, gear identification point verification:

expanding a diagnosis service calibration value under a session, reading a relative AD value of each current file position point through a UDS command, wherein the relative AD value interval of each file position point is required to be kept within 2284.5 +/-20, the error range is about 1%, and the error of the embodiment is performed according to the 20AD value; meanwhile, the current read AD value of each position is required to be compared with the 5 calibrated AD values obtained in the step S3, whether the AD values are basically consistent or not is judged, and the error is smaller than 20AD values (which can be calibrated); if the verification is not qualified, the physical positions of the 5 gear positions may have deviation, and the operation precision of the gear positions of the physical positions needs to be improved, for example, an electronically controlled manipulator is used to capture the 5 gear positions.

S5, position identification strategy on the whole vehicle:

when the whole vehicle is powered on, the electronic gear shifter starts to work, the sensor can continuously detect the magnetic flux value, the general detection period is determined according to the characteristics of the sensor, the detection period of the embodiment is 2ms, the magnetic flux physical quantity is converted into an AD value and is sent to the main chip of the electronic gear shifter through SPI communication, the AD value is received by the main chip of the electronic gear shifter, and the AD value is compared and judged with the original gear calibration value and the corresponding gear identification area to finish gear shifting gear identification. And measures for judging logic conditions of the gear shifting signal request of the user are finally converted into CAN signals to be sent to the whole vehicle network.

The specific gear position identification process is explained below with specific user shift operations:

1. when the user does not operate the shift knob:

the electronic gear shifter knob should be located at the original point, the sensor reads an AD value corresponding to the original point, converts the AD value into a relative AD value and then communicates the relative AD value to the main chip through the SPI, and the main chip receives the AD value and processes the AD value correspondingly to the calibrated AD value to obtain a gear which is not operated by a user.

When the converted AD value received by the main chip is not in the gear identification area of the origin (fig. 1), the explanation is needed. When the main chip receives a gear identification area with a stable AD value and not at the original point for a long time (the time is more than or equal to 10S and can be calibrated), the main chip further judges according to the current AD value: when the AD value is in a gear dislocation error area, the main chip considers that the gear identification module has a fault; when the AD value is not in the original point identification area and is not in the gear shift error area, the main chip analyzes that the current knob position is stuck in other gear shift identification areas or gear shift vacuum areas.

2. When the user operates the shift knob:

when a user operates the knob, the main chip compares the received AD value with the AD identification areas of all the gear positions, and when the AD value is in the AD identification areas, the main chip considers that the user performs the gear shifting operation;

meanwhile, in order to distinguish the process file site and the target file site of the user, the time that the AD value received by the main chip is in the AD identification area is more than or equal to 50ms (can be calibrated according to the user experience), the main chip is considered as the target file site of the user, otherwise, the main chip is processed into the process file site, and the position identification is not carried out. For example, when a user enters the R gear from the D gear and needs to cross a gear point of the N gear, and when the time for the user to shift gears to pass through the AD identification area of the N gear is within 50ms, the main chip is processed into a process gear point; and when the time in the N-gear AD identification area exceeds 50ms, the main chip processes the position into a user target gear position point to carry out position identification.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.