CN204229589U - Vehicle-mounted non-invasive driver stress pick-up unit - Google Patents
Vehicle-mounted non-invasive driver stress pick-up unit Download PDFInfo
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- CN204229589U CN204229589U CN201420781008.1U CN201420781008U CN204229589U CN 204229589 U CN204229589 U CN 204229589U CN 201420781008 U CN201420781008 U CN 201420781008U CN 204229589 U CN204229589 U CN 204229589U
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Abstract
Vehicle-mounted non-invasive driver of the present utility model stress pick-up unit, and comprise photo-electric pulse transducer and circuit part, the structure of the photo-electric pulse transducer of both sides is identical; Microcontroller is also connected with vehicle sensors for obtaining travel condition of vehicle information and for the GPRS that obtains traffic environment information residing for vehicle or triones navigation system; Microcontroller evaluates the current driving condition of driver whether safety according to gathered driver's ecg information, travel condition of vehicle information and traffic environment information, to be given a warning information in unsafe situation by warning circuit.Driver of the present utility model stress judgement system, utilize the electrocardiosignal of the driver gathered, the utility model detecting processing system is in conjunction with physical signs, stress differentiate from the angle of quantitative test driver, scientifically can carry out Evaluation and Prediction to driving safety state, beneficial effect is remarkable, easy to utilize.
Description
Technical field
The utility model relates to a kind of vehicle-mounted non-invasive driver stress pick-up unit, in particular, what particularly relate to that a kind of electrocardiosignal in conjunction with collection, surrounding traffic environmental information and measurement parameter come whether assess driver can continue safe driving stress judgement system.
Background technology
Because China's traffic environment is very complicated, driver cannot avoid the generation of emergency condition under steam completely.Driver thisly arising suddenly, the danger that allows people be taken by surprise and in emergency circumstances shown physiology, psychology and behavior height stress situation, as physiological reactions such as palpitating speed, unconscious knee jerk reflex, vertebra reflections; Produce as psychoreaction that is nervous, frightened mood; , the behavior reaction such as Information procession time lengthening, error in judgement narrow to the cognition of complicated traffic environment.This state has very large impact to driving behavior.Have the stress situation of the driver of rich experiences not obvious, thinking is quicker, and be swift in response reply emergency condition.In contrast, to driver's stress situation of lacking experience clearly, often supertension causes in a rush or is at a loss and causes traffic hazard.
Domestic and international research all shows, to having high correlativity with traffic hazard, stress have important meaning on driver's behavioral study.Except driving behavior can be damaged, and stress can increase traffic violation and accident risk.But stress be such as, by multifactor impact, personal lifestyle event, complicated road conditions, traffic congestion, driver's individual character, driving task and residing traffic environment etc.In addition, mobile unit, such as radio, navigational system, telephone receiving system etc., the use of these services or triggering can disperse the notice of driver, and bring out stress, there is potential security risk.And the stress level reducing driver has confirmed the notice being conducive to raising driver.At present, whether subjective differentiation driver is in stress situation is a kind of conventional quilitative method, but lacks certain reliability.
Summary of the invention
The utility model is in order to overcome the shortcoming of above-mentioned technical matters, and providing a kind of vehicle-mounted non-invasive driver stress pick-up unit.
Vehicle-mounted non-invasive driver of the present utility model stress pick-up unit, its special feature is: comprise be arranged at bearing circle both sides for detecting the photo-electric pulse transducer of driver's electrocardiosignal and carrying out the circuit part of data acquisition, computing and process, the structure of the photo-electric pulse transducer of both sides is identical; Photo-electric pulse transducer comprises and is adjacent to be arranged at the first breach on bearing circle and the second breach, is respectively arranged with light source, for receiving the light activated element of finger to the reflection ray of light source institute isolychn in the first breach, the second breach; Described circuit part is made up of microcontroller and coupled clock circuit, storer and warning circuit, and the output terminal of microcontroller is connected with light source, to control the power on/off state of light source; Light activated element output signal successively after the process of operational amplification circuit, second-order low-pass filter and A/D change-over circuit, input to the input end of microcontroller; Microcontroller is also connected with vehicle sensors for obtaining travel condition of vehicle information and for the GPRS that obtains traffic environment information residing for vehicle or triones navigation system; Microcontroller evaluates the current driving condition of driver whether safety according to gathered driver's ecg information, travel condition of vehicle information and traffic environment information, to be given a warning information in unsafe situation by warning circuit.
Photo-electric pulse transducer is arranged on bearing circle, is positioned at human pilot and points the position that usual state easily touches, and light source is understood some and received by light activated element after sending out the absorption of light through finger of output, reflection.Along with contraction and the diastole of human heart, blood flow is propagated in whole arterial system with the form of pressure wave, the haemoconcentration at driver's finger tip place can the cyclical variation along with beating of heart.Utilize material to be directly proportional to its concentration in the absorbance of a given wavelength, realize the detection to driver's electrocardiosignal.The light signal of reception is converted into electric signal by light activated element, and with this after amplification, filtering and A/D conversion, inputs to the input end of microcontroller.The signal that microcontroller exports light activated element gathers, computing and identification, calculate the heart rate value of driver, heart rate specific index, judge whether the stress situation of driver is suitable for safe driving, and combine the vehicle periphery traffic environment information and travel condition of vehicle information that obtain, reasonable warning message is sent to driver, to guarantee driving safety.
Vehicle-mounted non-invasive driver of the present utility model stress pick-up unit, and described light source, light activated element are respectively infrarede emitting diode, photodiode; Operational amplification circuit is made up of operational amplifier U1, resistance R1 and electric capacity C1, and photodiode is connected to both ends of power after connecting with resistance R1, and the negative pole of phototriode is connected to the normal phase input end of operational amplifier U1 through electric capacity C1; Be in series with resistance R2 and R3 between the normal phase input end of U1 and inverting input, after resistance R4 is in parallel with electric capacity C2, be connected to output terminal and the inverting input of U1.
Vehicle-mounted non-invasive driver of the present utility model stress pick-up unit, described second-order low-pass filter is made up of dual operational amplifier U2, the output of operational amplification circuit is connected to the inverting input of first amplifier of U2 through resistance R5 and R6, the output of first amplifier of U2 is connected to the inverting input of U2 second amplifier through resistance R9 and R10.
The beneficial effects of the utility model are: driver of the present utility model stress judgement system, by arranging the photo-electric pulse transducer be made up of light source and light activated element in the both sides of steering wheel, collection light activated element outputed signal by microcontroller and computing, effectively can obtain the electrocardiosignal of driver, and ask for heart rate value, the heart rate specific index of driver, according to electrocardiosignal, scientific and rational assessment is carried out to the stress situation of driver.According to the electrocardiosignal of the driver obtained, the traffic environment information obtained in combination with GPS or triones navigation system and the car status information obtained by vehicle sensors, carry out assess driver and whether can continue safe driving, and send corresponding audio alert information.
Driver of the present utility model stress judgement system, utilize the electrocardiosignal of the driver gathered, combining geographic information system and present road traffic real time environment, and the stress level combined in the past, for detecting, differentiating, point out and the state of high stress of early warning driver, avoid the faulty operation that driver's the state of high stress produces, and then avoid the generation of this type of traffic hazard.The utility model detecting processing system, in conjunction with physical signs, stress differentiate driver from the angle of quantitative test, and stress assess and detect driver based on physical signs, and beneficial effect is remarkable, easy to utilize.
Accompanying drawing explanation
Fig. 1 is that driver of the present utility model stress the structural representation of bearing circle in judgement system;
Fig. 2 is that driver of the present utility model stress the laying schematic diagram of light source and light activated element in judgement system;
Fig. 3 is that driver of the present utility model stress the schematic diagram of circuit part in judgement system;
Fig. 4 is that driver of the present utility model stress the circuit diagram of operational amplification circuit in judgement system;
Fig. 5 is that driver of the present utility model stress the circuit diagram of second-order low-pass filter in judgement system.
In figure: 1 bearing circle, 2 first breach, 3 second breach, 4 light sources, 5 light activated elements, 6 connection cables, 7 microcontrollers, 8 thumbs, 9 operational amplification circuits, 10 second-order low-pass filters, 11 A/D change-over circuits, 12 clock circuits, 13 storeies, 14 GPS or triones navigation system, 15 vehicle sensors, 16 warning circuits.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, giving driver of the present utility model stress the structural representation of bearing circle in judgement system, and two shown photo-electric pulse transducers are arranged at bearing circle 1 both sides, and its structure and Cleaning Principle are all identical.Each photo-electric pulse transducer forms by light source 4 and light activated element 5, the both sides of bearing circle are provided with the first breach 2 and the second breach 3, light source 4 is arranged in the first breach 2, light activated element 5 is arranged in the second breach 3, first breach 2 and the second breach 3 are close to, so that the light that light source 4 sends is by after finger, reflection, are irradiated on light activated element 5, realize the detection to driver's finger tip place arterial hyperemia amount, the pulse signal of human body can be obtained.
As shown in Figure 2, the driver giving utility model stress the laying schematic diagram of light source and light activated element in judgement system, and the first shown breach 2 and the second breach 3 are close to, and should ensure that the light that light source 4 sends can be irradiated in light panel element after finger is launched.Connection cable 6 is formed, to realize the connection for circuit part after the signal wire boundling of light source 4 and light activated element 5.
As shown in Figure 3, giving driver of the present utility model stress the schematic diagram of circuit part in judgement system, it comprises microcontroller 7 and coupled clock circuit 12, storer 13, GPS or triones navigation system 14, vehicle sensors 15 and warning circuit, the output terminal of microcontroller 7 is connected with light source 4, to control the luminance of light source 4.Light activated element 5 receives the light that driver's finger (as thumb 8) launches, light signal is converted into electric signal, and successively after the analog/digital conversion of the amplification of operational amplification circuit 9, the filtering of second-order low-pass filter 10 and A/D change-over circuit, input to the input end of microcontroller 7.The signal that microcontroller 7 pairs of light activated elements 5 export carries out high speed acquisition, to obtain the electrocardiosignal of driver, calculates heart rate value, the specific index of heart rate, to assess the stress situation of driver.
Clock circuit 12 provides pulse signal to the work of microcontroller 7, and storer 13 is for storing other data such as the electrocardiosignal of microcontroller 7 acquisition.Microcontroller 7 can obtain the current position of vehicle by GPS or triones navigation system 14, and database knows the traffic environment information of vehicle periphery according to the map, makes reasonably prediction and estimate the running status of vehicle.Microcontroller 7 obtains the current running state data of vehicle by vehicle sensors 15.
As shown in Figure 4, giving driver of the present utility model stress the circuit diagram of operational amplification circuit in judgement system, it is made up of operational amplifier U1, light source 4, light activated element 5 adopt infrarede emitting diode, photodiode respectively, photodiode is connected to the two ends of power supply after connecting with resistance R1, the negative pole of photodiode is connected to the normal phase input end of operational amplifier U1 through electric capacity C1, be connected with resistance R2 and resistance R3 between the normal phase input end of U1 and inverting input in turn.Two ends after resistance R4 is in parallel with electric capacity C2 are connected to inverting input and the output terminal of U1 respectively.U1 can select precision operational-amplifier LT1112, and the output terminal of U1 is connected with the import and export end of second-order low-pass filter 10.
As shown in Figure 5, giving driver of the present utility model stress the circuit diagram of second-order low-pass filter 10 in judgement system, and it is made up of dual operational amplifier U2, and second-order low-pass filter 10 is made up of the circuit that front and back are identical.Resistance R5, resistance R6 are connected to the inverting input of first amplifier of U2 by the output signal of operational amplifier 9 successively, and the junction of resistance R5 and resistance R6, the junction of R6 and U2 are connected to the ground connect through electric capacity C3, electric capacity C4 respectively.The in-phase input end of first amplifier of U2 is connected through resistance R7 and power supply, is connected with output terminal through resistance R8.Circuit is below identical with circuit above.The output of second amplifier of U2 is the output of second-order low-pass filter 10.
Electrocardiosignal (ECG) refers to that heart is in each cardiac cycle, in succession excited by pacemaker, atrium, ventricle, along with bioelectric change, is drawn the figure (being called for short ECG) of the potential change of various ways by electrocardiograph from body surface.Wherein heart rate (HR) and HRV (HRV) are the important indicators of electrocardiosignal.Heart rate (HR) is the frequency of heartbeat, has reacted sympathetic nerve and parasympathetic coordinate operation result.And HRV (HRV) reflects the fine difference of primary and secondary heartbeat interval or R ripple interval by shooting.HRV (HRV) index is mainly divided into time domain index and frequency-domain index.Wherein, time domain index comprises RR interval (interval that heart is beaten at every turn), RR interval standard deviation (SDNN), RR interval mean value (MRR) etc.; Frequency-domain index comprises low-frequency range performance number (LF), high band performance number (HF), general power (TP) etc.
Heart rate specificity (HRV) analysis has been widely used in the mensuration of pilot, fatigue of automobile driver degree.Until in recent years, heart rate specificity analyses (HRV) just starts the research being applied to psychological stress, there are some researches show that HRV (HRV) index is reflection one of psychological stress comparatively sensitive indexes, stress change can cause the change of heart rate variability metrics, the wherein variant conspicuousness of LF, HF, LF/HF index most.Therefore, the utility model select heart rate specificity (HRV) index be used for driver stress differentiation.
Heart rate specificity (HRV) is the important indicator describing cardiac rhythmicity change, and can reflect the functional status of autonomic nerve.This is a kind of novelty, sensitivity and can surveying, and can be used for evaluating the non-wound method that autonomic nerve integrates.Electrocardiosignal contains a large amount of abundant information, can be used for carrying out accurate and visual judgement to driver's stress situation, in addition choosing reasonable index and utilize index trend to adopt certain method to obtain stress threshold value, for differentiating that driver stress play an important role further.
The carrying out that HRV index stress be trained along with driver and changing, by carrying out HRV frequency-domain index (VLF, LF, HF, VHF, LF/HF) significance analysis to all experiment samples.Significant result analysis shows, LF, LF/HF to driver stress reaction the most responsive, this conforms to substantially to relevant result of study.So the utility model select LF and LF/HF as research driver stress index.According to the Variation Features of LF, LF/HF, under selecting normality, LF and LF/HF is as threshold value, can differentiate driver's stress situation.
Claims (3)
1. a vehicle-mounted non-invasive driver stress pick-up unit, it is characterized in that: comprise be arranged at bearing circle (1) both sides for detecting the photo-electric pulse transducer of driver's electrocardiosignal and carrying out the circuit part of data acquisition, computing and process, the structure of the photo-electric pulse transducer of both sides is identical; Photo-electric pulse transducer comprises and is adjacent to be arranged at the first breach (2) on bearing circle and the second breach (3), is respectively arranged with light source (4), for receiving the light activated element (5) of finger to the reflection ray of light source institute isolychn in the first breach, the second breach; Described circuit part is made up of microcontroller (7) and coupled clock circuit (12), storer (13) and warning circuit (16), and the output terminal of microcontroller is connected with light source, to control the power on/off state of light source; Light activated element output signal successively after the process of operational amplification circuit (9), second-order low-pass filter (10) and A/D change-over circuit (11), input to the input end of microcontroller; Microcontroller is also connected with vehicle sensors (15) for obtaining travel condition of vehicle information and for the GPRS that obtains traffic environment information residing for vehicle or triones navigation system; Microcontroller evaluates the current driving condition of driver whether safety according to gathered driver's ecg information, travel condition of vehicle information and traffic environment information, to be given a warning information in unsafe situation by warning circuit.
2. vehicle-mounted non-invasive driver according to claim 1 stress pick-up unit, it is characterized in that: described light source (4), light activated element (5) are respectively infrarede emitting diode, photodiode; Operational amplification circuit (9) is made up of operational amplifier U1, resistance R1 and electric capacity C1, and photodiode is connected to both ends of power after connecting with resistance R1, and the negative pole of phototriode is connected to the normal phase input end of operational amplifier U1 through electric capacity C1; Be in series with resistance R2 and R3 between the normal phase input end of U1 and inverting input, after resistance R4 is in parallel with electric capacity C2, be connected to output terminal and the inverting input of U1.
3. vehicle-mounted non-invasive driver according to claim 1 and 2 stress pick-up unit, it is characterized in that: described second-order low-pass filter (10) is made up of dual operational amplifier U2, the output of operational amplification circuit (9) is connected to the inverting input of first amplifier of U2 through resistance R5 and R6, the output of first amplifier of U2 is connected to the inverting input of U2 second amplifier through resistance R9 and R10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420781008.1U CN204229589U (en) | 2014-12-12 | 2014-12-12 | Vehicle-mounted non-invasive driver stress pick-up unit |
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| CN201420781008.1U CN204229589U (en) | 2014-12-12 | 2014-12-12 | Vehicle-mounted non-invasive driver stress pick-up unit |
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| CN204229589U true CN204229589U (en) | 2015-03-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354698A (en) * | 2014-12-12 | 2015-02-18 | 山东交通学院 | System and method for distinguishing stress of driver based on electrocardiosignals and geographic information |
| CN105411551A (en) * | 2016-01-02 | 2016-03-23 | 无锡桑尼安科技有限公司 | Human-body-state detecting device |
| US11311198B2 (en) | 2015-03-25 | 2022-04-26 | Tata Consultancy Services Limited | System and method for determining psychological stress of a person |
-
2014
- 2014-12-12 CN CN201420781008.1U patent/CN204229589U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354698A (en) * | 2014-12-12 | 2015-02-18 | 山东交通学院 | System and method for distinguishing stress of driver based on electrocardiosignals and geographic information |
| US11311198B2 (en) | 2015-03-25 | 2022-04-26 | Tata Consultancy Services Limited | System and method for determining psychological stress of a person |
| CN105411551A (en) * | 2016-01-02 | 2016-03-23 | 无锡桑尼安科技有限公司 | Human-body-state detecting device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20161212 |