CN108019509B - Gear sensor - Google Patents
Gear sensor Download PDFInfo
- Publication number
- CN108019509B CN108019509B CN201610932064.4A CN201610932064A CN108019509B CN 108019509 B CN108019509 B CN 108019509B CN 201610932064 A CN201610932064 A CN 201610932064A CN 108019509 B CN108019509 B CN 108019509B
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- Prior art keywords
- gear
- normally closed
- gear sensor
- closed switch
- control unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 abstract description 9
- 230000002265 prevention Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/42—Ratio indicator devices
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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
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides a gear sensor, which comprises a triggering device, a normally closed switch, a resistor network and an electronic control unit, wherein: the number of the normally closed switches is equal to that of gears, the normally closed switches are connected in series, each normally closed switch is connected with a resistor network in parallel, the resistance values of the resistor networks are different, and the electronic control unit is connected to two ends of a series circuit of the normally closed switches; when the gear lever enters or exits the gear, the trigger device is started, and the trigger device triggers the normally closed switch to be opened, so that the electronic control unit detects the resistance values at two ends of the parallel resistor of the normally closed switch, and the corresponding gear is detected due to different resistance values of different gears. The gear sensor further comprises a neutral detection unit. The invention combines the advantages of the contact type gear sensor and the non-contact type gear sensor, has the characteristics of low price and no electromagnetic interference of the contact type gear sensor, and also has the characteristics of long service life, high precision, high reliability and vibration prevention of the non-contact type gear sensor.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to a gear sensor.
Background
During the driving of the vehicle, the electronic control unit or the central control (processing) unit of the vehicle must always know where the shift lever is located, and therefore the gear sensor is an important component of the vehicle.
In the prior art, gear sensors are classified into contact gear sensors and non-contact gear sensors. The conventional gear sensor mostly adopts a contact type, and changes a resistance value through sliding contact between a metal brush and a resistance substrate, so as to change an output voltage signal, the voltage signal is transmitted to an electronic control unit, and the electronic control unit judges gear change. The contact gear sensor has the advantages that the contact frequently slides, the parts are easy to wear, the phenomena of poor contact, deviation of output resistance values and the like are easy to occur, signals cannot be normally transmitted, the service life is limited, meanwhile, due to vibration of an automobile, the contact piece can be instantaneously separated and poor in contact, so that the sensor is invalid and damaged, and the output linearity is difficult to control. The non-contact gear sensor adopts a magnetic device and a Hall sensor at present, and the magnetic strength of the gear magnetic device and the installation distance can influence the signal receiving of the gear sensor, so that the signal error output by the gear sensor is large, and the gear judgment error can be caused when the signal error is serious; the Hall type gear sensor is high in precision and long in service life, but the price is high, and in addition, the electric devices such as a new energy electric automobile can bring electromagnetic interference to the Hall type gear sensor, so that the stability of the gear sensor is affected.
Therefore, it is necessary to combine the advantages of both the contact-type gear sensor and the non-contact-type gear sensor, and to design a gear sensor having high self-mechanical reliability and high reliability of detecting an electric signal.
Disclosure of Invention
The invention aims to provide a gear sensor so as to solve the problems that the existing contact gear sensor is low in mechanical reliability and the non-contact gear sensor is low in reliability of detecting electric signals.
In order to solve the technical problem, the invention provides a gear sensor, which comprises a plurality of first triggering devices, a plurality of normally closed switches, a plurality of first resistor networks and an electronic control unit, wherein:
the normally closed switches are connected in series to form a normally closed switch series circuit;
the normally closed switches are connected in parallel with a first resistor network respectively;
the resistance values among the first resistor networks are different;
the plurality of first triggering devices trigger the normally closed switch to be opened;
And the electronic control unit is connected with the output end of the normally closed switch series circuit.
Optionally, in the gear sensor, the number of the plurality of normally closed switches is equal to the number of gears.
Optionally, in the gear sensor, the number of the plurality of first triggering devices is equal to the number of gears.
Optionally, in the gear sensor, a resistance difference between the first resistor networks is at least one time of a minimum resistance in the first resistor networks.
Optionally, in the gear sensor, a current limiting resistor network is arranged between the normally closed switch series circuit and the electronic control unit.
Optionally, in the gear sensor, the first triggering device is activated when the gear lever enters and exits the gear.
Optionally, in the gear sensor, the first triggering device is an elastic element.
Optionally, in the gear sensor, the gear sensor further includes a second triggering device, a normally open switch, and a second resistor network, for detecting whether the gear is located in the neutral position, where:
The normally open switch is connected with the second resistor network in parallel;
And the second triggering device triggers the normally open switch to be closed.
Optionally, in the gear sensor, the normally open switch is connected in series with the normally closed switch series circuit.
Optionally, in the gear sensor, the second triggering device is activated when the gear lever is in the neutral gear.
Optionally, in the gear sensor, the second triggering device is an elastic element.
In the gear sensor provided by the invention, the gear sensor judges the gear corresponding to the normally closed switch by detecting the resistance value of the series resistor network when the normally closed switch is opened, and different resistance values correspond to different normally closed switches, namely correspond to different gears.
Drawings
FIG. 1 is a schematic circuit diagram of a gear sensor according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a gear sensor according to a first embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a gear sensor according to a second embodiment of the present invention;
Fig. 4 is a schematic structural view of a gear sensor according to a second embodiment of the present invention.
The figure shows: 1-gear sensor; 10-first gear; 20-second gear; 30-third gear; 40-fourth gear; 50-fifth gear; 60-sixth gear (reverse gear); 70-a first triggering device; 80-gear lever; 90-track; 100-base; 110-a second triggering device.
Detailed Description
The invention provides a gear sensor which solves the problems of serious abrasion, low service life, low precision, vibration interference, high non-contact price and easiness in electromagnetic interference of the conventional contact gear sensor.
To achieve the above idea, the present invention provides a gear sensor comprising a plurality of first triggering devices, a plurality of normally closed switches, a plurality of first resistor networks and an electronic control unit, wherein: the normally closed switches are connected in series to form a normally closed switch series circuit; the normally closed switches are connected in parallel with a first resistor network respectively; the resistance values among the first resistor networks are different; the plurality of first triggering devices trigger the normally closed switch to be opened; and the electronic control unit is connected with the output end of the normally closed switch series circuit. To make the objects, advantages and features of the present invention more apparent, the gear sensor according to the present invention will be described in further detail with reference to fig. 1 to 4. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Example 1
As shown in fig. 1, the present invention provides a gear sensor, where the gear sensor 1 includes a plurality of normally closed switches, and the gear sensor 1 further includes a plurality of first resistor networks, where: the number of the normally closed switches is equal to the number of gears; in the first embodiment, the number of the normally closed switches is six B1, B2, B3, B4, B5 and Br, and the normally closed switches are in a closed state under normal working conditions, i.e. when no trigger signal is received, and are immediately switched from the closed state to the open state when the trigger signal or the change signal is received, and are restored to the closed state after the trigger signal disappears. Normally closed switches B1, B2, B3, B4, B5 and Br correspond to the first gear 10, the second gear 20, the third gear 30, the fourth gear 40, the fifth gear 50 and the sixth gear 60, respectively, wherein the sixth gear 60 can be set to a reverse gear or can be a common sixth gear, a typical automobile is set to 3 or 5 speed gears, and one reverse gear is added, so the normally closed switch is generally set to 4 to 6. The normally closed switches are connected in series and form a normally closed switch series circuit, each normally closed switch is further connected in parallel with a first resistor network, and normally closed switches B1, B2, B3, B4, B5 and Br correspond to the first resistor networks R1, R2, R3, R4, R5, rr and Rn respectively. The resistance values of the plurality of first resistor networks R1, R2, R3, R4, R5, rr and Rn are different, and the difference is preferably enough for the electronic control unit to determine the difference between the first resistor networks, and preferably, the resistance value difference between the first resistor networks is at least one time of the minimum resistance value in the plurality of first resistor networks.
The gear sensor further comprises an electronic control unit, and two ends (an end A and an end B in fig. 1) of the normally closed switch series circuit are connected with the electronic control unit or the central processing unit and are used for detecting resistance change caused by gear change; the electronic control unit can be a singlechip, a micro control unit MCU, a digital signal processor DSP and a central processing unit CPU, or can be a control circuit formed by analog electronic circuits, etc. A current-limiting resistance network is arranged between the normally-closed switch series circuit and the electronic control unit, as shown in fig. 1, the current-limiting resistance network is simplified into an equivalent resistance R0, the current-limiting resistance network R0 is mainly used for overcurrent change, when the normally-closed switches B1, B2, B3, B4, B5 and Br are all closed, the point O1 and the point O7 are equivalent to short circuit, and if the current-limiting resistance network R0 is not added, the normally-closed switch and the electronic control unit which form the series circuit are damaged by overcurrent.
As shown in fig. 2, the gear sensor 1 further includes a plurality of first triggering devices, where each gear corresponds to one first triggering device, that is, the number of the plurality of first triggering devices is equal to the number of gears. Since the principle and the usage method of the first triggering device corresponding to each gear are the same, the present specification only describes the structure, principle and usage method of the first triggering device 70 corresponding to the first gear 10, and the first triggering devices corresponding to other gears can refer to the description of the first triggering device 70 of the first gear 10.
The first triggering device 70 triggers the normally closed switch B1 to open, when the first triggering device 70 is started by the arrival of a triggering signal, the first triggering device 70 can enable the normally closed switch B1 to act, the normally closed switch B1 is changed from a closed state to an open state, and after the triggering signal disappears, the normally closed switch B1 is restored to the closed state again, and the period of time is very short, often in millisecond level. The first triggering device 70 is an elastic element, and further, may be an elastic element pushed by a gear lever.
The gear lever 80 may comprise a cylinder having a diameter preferably smaller than the distance between the inner wall of the track 90 and the outer surface of the elastic member of each first triggering device, and larger than the distance between the inner wall of the track 90 and the outer surface of the elastic member of each first triggering device, so as to reliably push the elastic member of each first triggering device, thereby deforming the elastic member and activating each first triggering device; the gear lever 80 activates the respective first triggering devices corresponding to the respective gears when entering and exiting the respective gears (first gear 10, second gear 20, third gear 30, fourth gear 40, fifth gear 50, and sixth gear 60).
The first gear 10 position detection principle and process are as follows: when the gear lever 80 enters the first gear 10, as shown in fig. 2, the gear lever 80 starts the first trigger device 70, in this embodiment, the first trigger device 70 is an elastic piece with a semicircular contact surface, and the conductor contact piece embedded in the normally closed switch B1 and responsible for switching on the contacts O1 and O2 will also separate the contacts O1 and O2 along with the push-back of the elastic piece of the first trigger device 70, so that the normally closed switch B1 will be opened; the total resistance Rnt of the output ends (the end A and the end B in fig. 1) of the normally-closed switch series circuit is changed from R0 to (R0+R1), and at this time, an electronic control unit connected with the two ends of the normally-closed switch series circuit can detect the change of the resistance value of the output end of the normally-closed switch series circuit, so as to judge the change of the gear. When the gear lever 80 completely enters the first gear 10, the elastic deformation of the elastic member of the first triggering device 70 is recovered, and the triggering signal disappears, so that the normally closed switch B1 is recovered to be in a closed state, the O1 and the O2 are reconnected, and the total resistance value Rnt of the normally closed switch series circuit is recovered to be R0.
During the process of moving the gear lever 80 out of the first gear 10 position, the gear lever 80 starts the first trigger device 70, the conductor contact piece embedded in the normally closed switch B1 and responsible for switching on the contacts O1 and O2 will also separate the contacts O1 and O2 along with the backward pushing of the first trigger device 70, and the normally closed switch B1 will be opened; causing the output total resistance Rnt of the normally-closed switch series circuit to change from R0 to (R0+R1). When the first gear 10 is completely exited, the first triggering device 70 will resume the combination of the normally closed switch B1, the O1 and the O2 are reconnected, and the total resistance value Rnt of the normally closed switch series circuit is restored to R0.
The above-mentioned change of the resistance value combined with the gear state can identify the position information of the first gear 10. The detection principle and detection process of the second gear 20, the third gear 30, the fourth gear 40, the fifth gear 50 and the sixth gear 60 are the same as those of the first gear 10, and the description will not be repeated herein, and the detection principle and detection process of the second gear 20, the third gear 30, the fourth gear 40, the fifth gear 50 and the sixth gear 60 refer to those of the first gear.
< Example two >
As shown in fig. 3, unlike the first embodiment, the gear sensor 1 in the second embodiment further includes a second triggering device 110, a normally open switch Bn, and a second resistor network Rn, where the second triggering device 110, the normally open switch Bn, and the second resistor network Rn form a neutral detection unit for detecting whether the gear is located at the neutral position. The normally open switch Bn is connected in parallel with the second resistor network Rn. The normally open switch Bn is connected in series with the normally closed switches B1, B2, B3, B4, B5 and Br, and the second triggering device 110 is configured to trigger the normally open switch Bn to be closed.
The neutral position detection unit may realize neutral position detection. As shown in fig. 3, the second triggering device 110 includes a spherical conductor, one end of the spherical conductor is fixedly adhered with an elastic piece, the elastic piece is fixed on a bracket of the second triggering device 110, is installed on the inner wall side of the track 90, is not close to other gear positions, is installed at a position above the gear lever 80 in parallel, when the gear lever 80 is in a neutral natural state, the gear lever 80 pushes the spherical conductor arranged at the second triggering device 110 to move, after the spherical conductor reaches a certain displacement, contacts P1 and P2 which are inlaid in the normally open switch Bn and are responsible for being connected are connected, the normally open switch Bn connected with the contacts is closed, and the total output resistance value Rnt of a serial circuit of the normally open switch and the normally closed switch is a fixed value R0.
When the shift lever 80 moves out of the neutral position, the spherical conductor is pushed out by the telescopic elastic member of the second trigger 110, the contacts P1 and P2 are separated, the normally open switch Bn is restored to the open state, and the total resistance value Rnt of the outputs (the a end and the B end in fig. 3) of the series circuit of the normally open and normally closed switches is restored to a fixed value (r0+rn).
The electronic control unit can conveniently judge the position information of the neutral natural state by detecting the size of Rnt.
The resistor network mentioned in the above specification and the resistor networks mentioned in the first and second embodiments may be one resistor, or a plurality of resistors may be connected in series or a plurality of resistors may be connected in parallel, or a plurality of resistors may be connected in series or parallel.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, the description is relatively simple because of corresponding to the method disclosed in the embodiment, and the relevant points refer to the description of the method section.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (7)
1. The utility model provides a gear sensor, its characterized in that, gear sensor includes a plurality of first trigger device, a plurality of normally closed switch, a plurality of first resistance network and electronic control unit, wherein:
each gear corresponds to one first trigger device and one normally closed switch;
the normally closed switches are connected in series to form a normally closed switch series circuit;
the normally closed switches are connected in parallel with a first resistor network respectively;
the resistance values among the first resistor networks are different;
the plurality of first triggering devices trigger the normally closed switch to be opened;
the electronic control unit is connected with the output end of the normally closed switch serial circuit and is used for detecting resistance change caused by gear change;
the first triggering device is started when the gear lever enters and exits the gear;
The first triggering device is an elastic element.
2. The gear sensor of claim 1, wherein a difference in resistance between the first resistor networks is at least one time a minimum resistance of the plurality of first resistor networks.
3. Gear sensor according to claim 1, characterized in that a current limiting resistor network is arranged between the normally closed switch series circuit and the electronic control unit.
4. Gear sensor according to claim 1, further comprising a second triggering device, a normally open switch and a second resistor network for detecting whether the gear is in a neutral position, wherein:
The normally open switch is connected with the second resistor network in parallel;
And the second triggering device triggers the normally open switch to be closed.
5. The gear sensor of claim 4, wherein the normally open switch is in series with the normally closed switch series circuit.
6. The gear sensor of claim 4, wherein the second trigger device is activated when the gear lever is in neutral.
7. Gear sensor according to claim 6, characterized in that the second triggering device is a resilient element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610932064.4A CN108019509B (en) | 2016-10-31 | 2016-10-31 | Gear sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610932064.4A CN108019509B (en) | 2016-10-31 | 2016-10-31 | Gear sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108019509A CN108019509A (en) | 2018-05-11 |
| CN108019509B true CN108019509B (en) | 2024-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610932064.4A Active CN108019509B (en) | 2016-10-31 | 2016-10-31 | Gear sensor |
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| Country | Link |
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| CN (1) | CN108019509B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112702047A (en) * | 2021-01-04 | 2021-04-23 | 长江存储科技有限责任公司 | Switching device, integrated circuit, and electronic apparatus |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4267545A (en) * | 1979-08-17 | 1981-05-12 | Fiat-Allis Construction Machinery, Inc. | Hydraulic vehicle performance sensor and shift point indicator |
| US5231254A (en) * | 1991-12-11 | 1993-07-27 | Texas Instruments Incorporated | Automobile transmission mode sensing apparatus |
| KR20010005247A (en) * | 1999-06-30 | 2001-01-15 | 정몽규 | Shift mode counter of manual transmission |
| JP2007232022A (en) * | 2006-02-28 | 2007-09-13 | Honda Motor Co Ltd | Shift position detecting device for transmission |
| CN201233252Y (en) * | 2008-06-19 | 2009-05-06 | 江苏宗申三轮摩托车制造有限公司 | Right three-wheeled motorcycle instrument gear displaying and signal detecting instrument |
| CN201670662U (en) * | 2010-05-10 | 2010-12-15 | 江苏沃得起重机有限公司 | Running limit device for single-beam crane |
| CN104343974A (en) * | 2014-09-15 | 2015-02-11 | 力帆实业(集团)股份有限公司 | Current gear displaying system of motorcycle |
| CN206159465U (en) * | 2016-10-31 | 2017-05-10 | 联合汽车电子有限公司 | Shift position sensor |
-
2016
- 2016-10-31 CN CN201610932064.4A patent/CN108019509B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4267545A (en) * | 1979-08-17 | 1981-05-12 | Fiat-Allis Construction Machinery, Inc. | Hydraulic vehicle performance sensor and shift point indicator |
| US5231254A (en) * | 1991-12-11 | 1993-07-27 | Texas Instruments Incorporated | Automobile transmission mode sensing apparatus |
| KR20010005247A (en) * | 1999-06-30 | 2001-01-15 | 정몽규 | Shift mode counter of manual transmission |
| JP2007232022A (en) * | 2006-02-28 | 2007-09-13 | Honda Motor Co Ltd | Shift position detecting device for transmission |
| CN201233252Y (en) * | 2008-06-19 | 2009-05-06 | 江苏宗申三轮摩托车制造有限公司 | Right three-wheeled motorcycle instrument gear displaying and signal detecting instrument |
| CN201670662U (en) * | 2010-05-10 | 2010-12-15 | 江苏沃得起重机有限公司 | Running limit device for single-beam crane |
| CN104343974A (en) * | 2014-09-15 | 2015-02-11 | 力帆实业(集团)股份有限公司 | Current gear displaying system of motorcycle |
| CN206159465U (en) * | 2016-10-31 | 2017-05-10 | 联合汽车电子有限公司 | Shift position sensor |
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| CN108019509A (en) | 2018-05-11 |
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