CN206056609U - A kind of piezoelectric type door handle sensor - Google Patents
A kind of piezoelectric type door handle sensor Download PDFInfo
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- CN206056609U CN206056609U CN201620602220.6U CN201620602220U CN206056609U CN 206056609 U CN206056609 U CN 206056609U CN 201620602220 U CN201620602220 U CN 201620602220U CN 206056609 U CN206056609 U CN 206056609U
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- door handle
- handle sensor
- door
- type door
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Abstract
The utility model discloses a kind of piezoelectric type door handle sensor, which includes piezoelectric element, wave filter, amplifier, positive negative pulse stuffing separator, microprocessor.The characteristics of different wave signal can be produced under different actions using same piezoelectric element, using filtering, the processing of circuit input signals such as amplification, signal is analyzed by positive negative pulse stuffing separator and microprocessor again, enabling and operation of locking a door are recognized with different signal characteristics, the function that various operations are recognized with a sensor is realized.This kind of implementation is locked a door without the need for setting and switchs or lock a door sensor, with single-sensor output enabling signal and signal of locking a door.Thus, this utility model provides a kind of less expensive cost, construction simpler, more reliable performance, the more preferable door handle sensor of user operation impression.
Description
Technical field
The present invention relates to automobile door handle sensor, more particularly to it is a kind of for automobile no-key into activation system in
Both exportable enabling signal, and the door handle sensor of exportable signal of locking a door.
Background technology
Automobile no-key is entered and activation system（Passive Entry ＆ Passive Start, are abbreviated as PEPS）By
Relatively broad application is obtained in the good advantage of its convenient and swift Consumer's Experience, for the automobile for being equipped with PEPS system, door
Handle is in addition to producing when someone pulls handle and waking up the signal that PEPS is used for unlocking, it is necessary to provides to PEPS system and locks a door
Signal.
At present, there is provided the method for signal of locking a door has two kinds.The first installs a special switch of locking a door on door handle.
Special switch of locking a door is installed PEPS system can be provided and lock a door signal, but can but affect the overall appearance of door handle, and
Row water-proofing treatment is put with split due to installing switch of locking a door, cost increase will be caused.Therefore have second method, that is, arrange and lock a door
The mode of sensitive unit provides signal of locking a door.Sensitive unit of locking a door is hidden in door handle sheet in vivo, has not only met waterproof requirement but also will not shadow
Ring the outward appearance of door handle.But, two completely self-contained sensitive units are set in door handle（Unlock and unlock each one）, cause machine
Structure is complicated, electronic devices and components cost increase, and there is touching enabling simultaneously, the risk of sensitive unit of locking a door, and makes door handle sensor
Global reliability declines.
The content of the invention
Present invention aim at solve the problems, such as that prior art needs two sensors to export enabling and signal of locking a door respectively,
There is provided it is a kind of by single-sensor export open the door, lock a door and other operation signals piezoelectric type door handle sensor.
Piezoelectric type door handle sensor of the present invention, it is characterised in that include：
Piezoelectric element：Grasped or knocking by user, the piezoelectric element in door handle can produce the different signals of telecommunication, and will
The signal of telecommunication is sent to wave filter；
Wave filter：The signal of telecommunication that piezoelectric element sends is received, the noise filtered in signal is then sent to amplifier；
Amplifier：The signal that receiving filter sends, enters line amplitude amplification, the signal after amplification is sent to just to signal
Negative pulse separator；
Positive negative pulse stuffing separator：The signal more than predetermined threshold of reception amplifier output, the simulation of opposed polarity is believed
Number be converted to corresponding pulse；
Microprocessor：Judge that door handle is to be grasped or knocking according to the parameter attribute of the pulse signal for receiving,
And control corresponding output end, will unlock, unlocking signal is sent to output interface；
Output interface：Make the requirement of the different follow-up system input interfaces of output electrical characteristics adaptation of door handle sensor.
A kind of piezoelectric type door handle sensor of the present invention, using sliding door handle and knock at the door handle when, sensor produce
Signal waveform difference this feature, using filtering, the processing of circuit input signal such as amplify, then separated by positive negative pulse stuffing and
Microprocessor is analyzed to pulse characteristicses, and enabling and operation of locking a door are recognized according to different features, and realization is sensitive with one
The function of the various operations of unit's identification.This kind of implementation need not be arranged locks a door switch or locks a door sensitive unit, with single sensitivity unit
Output enabling signal and signal of locking a door.Thus, the invention provides a kind of cost is less expensive, construction is simpler, more reliable performance,
More preferable door handle sensor is experienced in user operation.
Description of the drawings
Fig. 1 is a kind of circuit structure block diagram of piezoelectric type door handle sensor.
Fig. 2 is the signal waveform of piezoelectric element output when grasping door handle.
The signal waveform of piezoelectric element output when Fig. 3 is knocking door handle.
Fig. 4 is a positive negative pulse stuffing splitter circuit example being made up of operational amplifier.
Specific embodiment
As shown in figure 1, a kind of piezoelectric type door handle sensor, including：
Piezoelectric element：Grasped or tapped by user, the piezoelectric element in door handle can produce the different signals of telecommunication, and will
The signal of telecommunication is sent to wave filter；
Wave filter：The signal of telecommunication that piezoelectric element sends is received, the noise filtered in signal is then sent to amplifier；
Amplifier：The signal that receiving filter sends, enters line amplitude amplification, the signal after amplification is sent to just to signal
Negative pulse separator；
Positive negative pulse stuffing separator：The signal more than predetermined threshold of reception amplifier output, the simulation of opposed polarity is believed
Number be converted to corresponding pulse；
Microprocessor：It is to be grasped or kowtowed to judge door handle according to the parameter attribute of the pulse signal for receiving
Hit, and control corresponding output end, will unlock, unlocking signal sent to output interface；
Output interface：Make the requirement of the different follow-up system input interfaces of output electrical characteristics adaptation of door handle sensor.
The piezoelectric element being arranged on door handle is in door handle by the signal that different wave can be produced when grasping with knocking：
When grasping door handle, as shown in Fig. 2 its cycle is about 300 ms, frequency is about for signal waveform that piezoelectric element is produced
3.3Hz, signal occur positive pulse first, and persistent period ascent stage is no less than 100ms, negative pulse more than just occurring after 100ms, two
The time difference that person occurs is more than 150ms.In knocking door handle, waveform that its piezoelectric element is produced as shown in figure 3, its cycle exist
Between 10 to 20ms, frequency about 50 to 100Hz, signal occur positive pulse first, are followed by negative pulse, the time difference that both occur
No more than 15ms.Both contrast waveforms, easily find that its waveshape signal has different characteristic：Grasp the positive signal for producing to hold
The positive signal persistent period that the continuous time is produced much larger than knocking.So, user can be distinguished exactly by electronic circuit
It is that grasping door handle attempts to unlock or knocking door handle attempts to lock a door.For example, by the persistent period of detection signal, positive polarity
Signal duration the grasp motion that is more than 20ms, positive signal and minus polarity signal persistent period followed by it
Be snap action less than 20ms, it is and by being defined to the signal that different actions are produced, just achievable different
Function.
The present embodiment by grasp door handle produce signal definition be unlocking signal, knocking door handle produce signal definition
For signal of locking a door, to meet the use habit of people.When user's grasping or knocking door handle, piezoelectric element produces corresponding signal simultaneously
Wave filter is transmitted the signal to, wave filter extracts waveform clearly signal after the signal for receiving is filtered off clutter, amplifies
Device is amplified to the signal so as to can be recognized by positive negative pulse stuffing separator.Positive pole of the positive negative pulse stuffing separator in signal voltage
Property partially larger than the threshold value of setting when, its positive pulse outfan（The outfan being connected with microprocessor input 1 in Fig. 1）, it is defeated
Go out high level；When the negative polarity portion of signal voltage is less than the threshold value for setting, its negative pulse outfan（With microprocessor in Fig. 1
The outfan that device input 2 is connected）Output high level.The pulse information that microprocessor analysis input 1 and 2 is received：Input
End 1 detects an amplitude more than threshold value and width is more than the pulse of 20ms, then this pulse is the signal that grasp motion is produced, micro-
Processor grasps the output high level of signal output part 3, and the signal is enabling signal, and interface circuit receives the information and then exports out
Gate signal；If after microprocessor pulse input end 1 detects positive pulse information, input 2 detects negative pulse information immediately
And start to negative pulse the time for terminating less than 20ms, the then signal that this pulse is produced for snap action, micro- place from positive pulse
Reason device knocking signal output part 4 exports high level, and the signal is signal of locking a door.
The setting of output interface, is in order that the output level of door handle sensor adapts to different PEPS controller inputs and connects
The requirement of mouth level.
Described positive negative pulse stuffing separator can constitute voltage comparator by two operational amplifiers and constitute, the positive negative pulse stuffing point
A kind of specific embodiment from device is as shown in figure 4, the positive input and the second operational amplifier of the first operational amplifier OP1
The connected input as positive negative pulse stuffing separator of the inverting input of OP2, one end of first resistor R1 are connected with+5V voltages,
The other end is connected with one end of the inverting input and second resistance R2 of the first operational amplifier OP1, second resistance R2 it is another
End is connected with one end of the positive input and 3rd resistor R3 of the second operational amplifier OP2, another termination of 3rd resistor R3
Ground.If input is in static state,（Signal voltage is 0 volt）DC voltage is 2.5 volts for 1/2nd of supply voltage；Positive polarity
Signal changes between 2.5 to 5 volts；Minus polarity signal changes between ground potential at 2.5 volts.It is appropriate to select R1, R2, R3, make
The inverting input of the first operational amplifier OP1（"-" input）Voltage is 3.5 volts, the positive input of OP2（"+" is input into
End）Voltage is 1.5 volts.So, when input terminal voltage is changed into more than 3.5 volts, outfan 1 (positive pulse outfan) can export height
Level；When input terminal voltage is changed into below 1.5 volts, outfan 2（Negative pulse outfan）High level can be exported.Positive negative pulse stuffing point
A kind of this embodiment is not limited to from device, in fact, when any input signal amplitude exceedes given threshold, its outfan is patrolled
The circuit structure that volume level changes all can here use, be the scope protected by the present invention.
The surface of piezoelectric element of the present invention is covered with flexible thermal isolation film, as staff itself has certain temperature, its
The pyroelectric effect that contact piezoelectric element is produced can produce interference to the work of piezoelectric element, and piezoelectric type door handle sensor is in ring
When border temperature is higher, the significant reaction ground of sensor can be slack-off as pyroelectricity is disturbed, can frequency by the phenomenon of clamping stagnation during enabling
Numerous generation.In this regard, arranging flexible thermal isolation film can then avoid impact of the staff temperature to piezoelectric element, it is to avoid the problems referred to above.
Such as Fig. 2, shown in Fig. 3, two kinds of signals that piezoelectric element is produced in the present invention, its frequency between 3Hz-100Hz,
So the wave filter adopted in the present invention should be band filter, preferably from the bandpass filtering that passband is 3Hz to 100Hz
Device.
Further, since the present invention can distinguish grasp motion and snap action, and definable difference action exactly for not
Same command signal, thus its signal definition that also can be produced with the snap action of various combination is different instructions, microprocessor
According to the signal characteristic abstraction useful signal for receiving, determine instruction content, and export corresponding command signal.
For example, the time interval of adjacent knocking is referred to as connecting less than 0.5s and knocks work, occurs little more than 0.5s during knocking
Referred to as pause in the interval of 2s.Company kowtows and is set to " Password Input starts " instruction, and the content being input into thereafter is close
Code；There is not knocking more than 2s, or password knocking total degree has exceeded restriction number of times, is set to Password Input END instruction.
The example for opening the window is realized by Password Input for one below：
Company is kowtowed the password for being defined as " opening to divulge information slightly vehicle window " for three times.User company kowtows pauses twice afterwards, then connects
Stop after kowtowing three times, then system performs " opening to divulge information by vehicle window slightly " instruction.
Claims (7)
1. a kind of piezoelectric type door handle sensor, it is characterised in that include：
Piezoelectric element：Grasped or knocking by user, the piezoelectric element in door handle can produce the different signals of telecommunication, and by telecommunications
Number send to wave filter；
Wave filter：The signal of telecommunication that piezoelectric element sends is received, the noise filtered in signal is then sent to amplifier；
Amplifier：The signal that receiving filter sends, enters line amplitude amplification, the signal after amplification is sent to positive and negative arteries and veins to signal
Rush separator；
Positive negative pulse stuffing separator：The signal more than predetermined threshold of reception amplifier output, the analogue signal of opposed polarity is turned
It is changed to corresponding pulse；
Microprocessor：Judge that door handle is to be grasped or knocking according to the parameter attribute of the pulse signal for receiving, and control
Corresponding output end processed, will unlock, unlocking signal sent to output interface；
Output interface：Make the requirement of the different follow-up system input interfaces of output electrical characteristics adaptation of door handle sensor.
2. a kind of piezoelectric type door handle sensor according to claim 1, it is characterised in that：The surface of the piezoelectric element
Cover flexible thermal isolation film.
3. a kind of piezoelectric type door handle sensor according to claim 1, it is characterised in that：Described positive negative pulse stuffing is separated
When device is that input signal amplitude exceedes given threshold, the circuit structure that its outfan logic level changes.
4. a kind of piezoelectric type door handle sensor according to claim 1 or 3, it is characterised in that：Described positive negative pulse stuffing
Separator includes operational amplifier and resistance, the positive input of the first operational amplifier OP1 and the second operational amplifier OP2's
The connected input as positive negative pulse stuffing separator of inverting input, one end of first resistor R1 are connected with+5V voltages, the other end
It is connected with one end of the inverting input and second resistance R2 of the first operational amplifier OP1, the other end of second resistance R2 and
One end connection of the positive input and 3rd resistor R3 of two operational amplifier OP2, the other end ground connection of 3rd resistor R3.
5. a kind of piezoelectric type door handle sensor according to claim 1, it is characterised in that：The wave filter is filtered for band logical
Ripple device.
6. according to a kind of arbitrary described piezoelectric type door handle sensor of claim 1-3, it is characterised in that：By various combination
The signal definition that snap action is produced is different instructions, microprocessor according to the signal characteristic abstraction useful signal for receiving,
Determine instruction content, and export corresponding command signal.
7. a kind of piezoelectric type door handle sensor according to claim 4, it is characterised in that：The knocking of various combination is moved
The signal definition that produces of work is different instructions, microprocessor according to the signal characteristic abstraction useful signal for receiving, it is determined that referring to
Content is made, and exports corresponding command signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620602220.6U CN206056609U (en) | 2016-06-20 | 2016-06-20 | A kind of piezoelectric type door handle sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620602220.6U CN206056609U (en) | 2016-06-20 | 2016-06-20 | A kind of piezoelectric type door handle sensor |
Publications (1)
| Publication Number | Publication Date |
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| CN206056609U true CN206056609U (en) | 2017-03-29 |
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| CN201620602220.6U Active CN206056609U (en) | 2016-06-20 | 2016-06-20 | A kind of piezoelectric type door handle sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973273A (en) * | 2016-06-20 | 2016-09-28 | 马瑞利汽车电子(广州)有限公司 | Piezoelectric type door handle sensor |
| CN111663870A (en) * | 2020-06-15 | 2020-09-15 | 大陆汽车研发（重庆）有限公司 | Concealed door handle controller |
| CN111898104A (en) * | 2020-07-20 | 2020-11-06 | 上海创功通讯技术有限公司 | Method for unlocking electronic equipment, storage medium, electronic equipment and card holder |
-
2016
- 2016-06-20 CN CN201620602220.6U patent/CN206056609U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973273A (en) * | 2016-06-20 | 2016-09-28 | 马瑞利汽车电子(广州)有限公司 | Piezoelectric type door handle sensor |
| CN111663870A (en) * | 2020-06-15 | 2020-09-15 | 大陆汽车研发（重庆）有限公司 | Concealed door handle controller |
| CN111898104A (en) * | 2020-07-20 | 2020-11-06 | 上海创功通讯技术有限公司 | Method for unlocking electronic equipment, storage medium, electronic equipment and card holder |
| CN111898104B (en) * | 2020-07-20 | 2024-04-12 | 上海创功通讯技术有限公司 | Method for unlocking electronic equipment, storage medium, electronic equipment and card holder |
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