CN204007789U - Signal processing module based on liquid level sensor - Google Patents
Signal processing module based on liquid level sensor Download PDFInfo
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- CN204007789U CN204007789U CN201420415011.1U CN201420415011U CN204007789U CN 204007789 U CN204007789 U CN 204007789U CN 201420415011 U CN201420415011 U CN 201420415011U CN 204007789 U CN204007789 U CN 204007789U
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Abstract
Name of the present utility model is called the signal processing module based on liquid level sensor, belongs to auto electronic control technology field.It is mainly to solve liquid level sensor to the inaccurate problem that causes instrument warning too early or false alarm of engine fluid liquid level perception.Its principal character is: comprise 12V power supply, 5V power supply, signal acquisition circuit, signal reference data circuit, signal comparator circuit and on-off circuit; 12V power supply is connected with signal comparator circuit with signal acquisition circuit, signal reference data circuit respectively; 5V power supply is connected with on-off circuit respectively; Signal acquisition circuit, signal reference data circuit output end are connected with forward, the negative input of signal comparator circuit respectively, and the output terminal of signal comparator circuit is connected with on-off circuit.The utlity model has the feature that adopts dual power supply, signal classification to process, be mainly used in converting automobile sensor simulating signal to switching signal.
Description
Technical field
The utility model belongs to auto electronic control technology field, is specifically related to a kind of signal processing module based on liquid level sensor.
Background technology
Along with the development and progress of automotive electronic technology, to accuracy and the accuracy of the correctness of car load operating mode judgement and coherent signal processing, require more and more higher.Sensor is as the sensory perceptual system of car load, and for the ECU (Electrical Control Unit) such as instrument are carried out, car load operating mode judges its output signal and sound and light alarm provides directly foundation in real time, therefore particularly important to the extraction of sensor signal and processing.
Because car load may be faced different clients, with a car, may adopt dissimilar liquid level sensor.Different simulating signals for different liquid level sensor outputs, thereby if being restricted, the compatibility of signal processing module will cause increasing of meter distortion product directly to cause the product design cycle long, complex process, and production cost is high, easily break down, be difficult to the problems such as reparation and maintenance.This just requires module itself to have good compatibility.
In addition, because liquid level sensor working environment is harsh, duty is complicated, under some special operation condition, can there is intermittent failure, even the input and output wire harness uncertain fault modes such as short circuit that open circuit, if these fault modes can not be processed by signal processing module, all can cause the erroneous judgement of instrument system and fail to judge, even can damage instrument, thereby affect the safety and reliability of Full Vehicle System.This just requires module itself to have good anti-interference.
In view of above situation, completing of a kind of signal processing module design proposal plays a middle-end effect in whole system, is finally control system service.This signal processing module that can process the different simulating signals of different liquid level sensor outputs can and bring two conveniences with car client to car load client simultaneously, the one, allow user in conjunction with selecting dissimilar engine fluid by the situation in car area, a liquid level sensor can mate polytype anti freezing solution.The 2nd, car load client can adopt dissimilar liquid level sensor for different users, with a vehicle, can mate dissimilar liquid level sensor.So greatly improve the compatibility of instrument system, also met current modularization, Integration Design thought.
Summary of the invention
The purpose of this utility model be exactly for above-mentioned background problem and optimal design a kind of smart electronics conversion equipment-signal processing module.
Technical solution of the present utility model is: a kind of signal processing module based on liquid level sensor, is characterized in that: comprise 12V power supply, 5V power supply, signal acquisition circuit, signal reference data circuit, signal comparator circuit and on-off circuit; Wherein, 12V power supply is connected with the power input of signal acquisition circuit, signal reference data circuit and signal comparator circuit respectively; 5V power supply is connected with the power input of on-off circuit respectively; Signal acquisition circuit output is connected with the positive input of signal comparator circuit, and signal reference data circuit output end is connected with the negative input of signal comparator circuit, and the output terminal of signal comparator circuit is connected with the input end of on-off circuit; The output terminal of on-off circuit is connected with instrument associated end.
Signal acquisition circuit described in technical solution of the present utility model consists of Transient Suppression Diode, the 8th resistance, liquid level sensor, Transient Suppression Diode with after liquid level sensor parallel connection, connect with the 8th resistance; In this closed circuit loop, if the residing liquid level of liquid level sensor changes, the equivalent resistance of liquid level sensor output is also along with respective change occurs, and the equivalent resistance of liquid level sensor output finally embodies with voltage form and is input to comparer forward signal input end; , there is faint variation for liquid level in size and the precision of the resistance of connecting with liquid level sensor in this circuit of choose reasonable, liquid level sensor can detect, and detects in real time the current state of liquid level, guaranteed real-time and the accuracy of signal processing module.Described signal reference data circuit is in series by the 6th resistance and the 7th resistance, purpose of design is to provide reference data voltage for liquid level signal, the setting of reference data voltage is one of key of the technical program, need to obtain by precision resistance dividing potential drop, and the concrete reference voltage value of setting solidifies by resistors match after need to verifying by experiment again.Described signal comparator circuit consists of the first resistance, the second resistance, the 3rd resistance, the 9th resistance, the tenth resistance, the first electric capacity, the 3rd electric capacity, the 4th electric capacity and comparer, the tenth resistance and the 3rd electric capacity are connected with comparer positive input, the 9th resistance and the 4th electric capacity are connected with comparer negative input, one end of the first resistance is connected with power supply, the other end is connected with one end and the comparator output terminal of the second resistance, and the other end of the second resistance is connected with a common port of the 3rd resistance and the first electric capacity; It is the design's core, by by the magnitude of voltage comparison of the magnitude of voltage of liquid level signal and reference signal, comparative result is exported at comparison output terminal with high level or low level state, for rear class on-off circuit provides direct switching signal.Described on-off circuit consists of triode, the 4th resistance, the 5th resistance and the second electric capacity, purpose of design is by on-off circuit, to convert the level state of prime comparator circuit output to voltage signal that instrument system can be identified, for instrument system provides direct liquid level basis for estimation.
The utility model adopts 12V power supply and 5V power supply dual power supply, this dual power supply is directly exported and is provided by instrument power module, 12V power supply is as signal processing module prime comparator circuit power supply and signal driver power supply, and 5V power supply is only as rear class on-off circuit power supply.Wherein, 12V power supply provides reference signal by the liquid level signal for input after the 6th resistance and the 7th electric resistance partial pressure on the one hand, passes through on the other hand the 8th resistance and liquid level sensor closed circuit loop in series, drives liquid level signal.These two signals are processed and are accessed the 12V electric power loop that another consists of the first resistance, the second resistance, the 3rd resistance later again by prime comparator circuit, for rear class on-off circuit provides input.Adopt this dual power supply technical scheme, the one, reduce or eliminated 12V power-supply fluctuation and brought deviation of signal.In this programme, if 12V power supply has fluctuation, also there is corresponding fluctuation in reference signal and liquid level signal, but both trend is consistent, and deviation of signal is relatively constant, and this forms impact hardly on the result of prime comparator circuit.The 2nd, front late-class circuit is power supply separately, has reduced the interference between circuit, has increased the reliability of signal processing module.
The utility model signal processing module that only has rear class on-off circuit and liquid level sensor to form relatively before, conceptual design has mainly been done following optimization: one, introduced prime comparator circuit, increased the input impedance of module, thereby improved anti-interference; Two, again demarcate and experimental verification liquid level signal reference (warning) point, from principle, avoided instrument system early to report to the police or the possibility of false alarm, thereby improved accuracy; The 3rd, revised the parameter of part components and parts, improved accuracy and the reliability of circuit; The 4th, this design proposal can matching voltage or resistance-type level transducer, has improved the compatibility of module.From static experiment and the road examination situation in later stage, this design has reached the warning effect accurately and reliably of expection.The utility model is mainly used in converting automobile sensor simulating signal to switching signal.
Accompanying drawing explanation
Fig. 1 is the utility model signal processing module principle framework figure.
Fig. 2 is the utility model signal processing module signal acquisition circuit conceptual scheme.
Fig. 3 is the utility model signal processing module signal reference data circuit arrangement figure.
Fig. 4 is the utility model signal processing module signal comparator circuit conceptual scheme.
Fig. 5 is the utility model signal processing module on-off circuit conceptual scheme.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Signal processing module principle framework figure as shown in Figure 1.Liquid level signal is input to signal comparator circuit 1-5 positive input after being processed by signal acquisition circuit 1-3, signal reference data circuit 1-4 outputs to signal comparator circuit negative input with reference to reference signal, signal comparator circuit is exported to on-off circuit 1-6 after these two (voltage) signals are compared, and after on-off circuit 1-6 processes, exports to instrument.Wherein signal acquisition circuit 1-3, signal reference data circuit 1-4 and signal comparator circuit 1-5 are by 12V Power supply, and on-off circuit 1-6 is by 5V Power supply.
Signal processing module signal acquisition circuit conceptual scheme as shown in Figure 2.Liquid level sensor Rt1 and the 8th resistance R 8 form closed-loop path, by the variation of liquid level sensor perception liquid level, Rt1 also changes thereupon, according to the known V1=Rt1/ of signal acquisition circuit 1-3 (Rt1+R8) * 12V, the variation of Rt1 can cause the variation of V1, and V1 is signal acquisition circuit, exports to the comparative voltage of signal comparator circuit.The size that is V1 can have decisive influence to the output of signal comparator circuit.Wherein, in this circuit, Transient Suppression Diode D2 can play the effect of protection liquid level sensor.
Signal reference data circuit arrangement figure as shown in Figure 3.The 6th resistance R 6 and the 7th resistance R 7 form closed-loop path, and the reference data voltage of signal comparator circuit is provided by the 7th resistance R 7 dividing potential drop output V2.According to the known V2=R7/ of signal reference data circuit (R7+R6) * 12V, if the 6th, the 7th resistance R 6, R7 are set, V2 determines, base reference signal is determined.Wherein the setting of V2 need meet Reliability design principles, and the utility model is to obtain by lot of experiment validation after theory setting.
Signal processing module signal comparator circuit conceptual scheme as shown in Figure 4.The filter network that V1 consists of the tenth resistance R 10, the 3rd capacitor C 3 is input to the forward of comparer U1A and relatively holds, the filter network that V2 consists of the 9th resistance R 9, the 4th capacitor C 4 is input to the negative sense of comparer U1A and relatively holds, after relatively processing, comparative result Vout1 exports by comparing output terminal.Known according to signal comparator circuit, when anode input voltage V1 is greater than negative terminal input voltage V2, comparer U1A output Vout1 is high level; When anode input voltage V1 is less than negative terminal input voltage V2, comparer U1A output Vout1 is low level.After dividing potential drop by the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3, known Vb=R3/ (R3+R2) * Vout1, and the variation of Vout1 can cause the variation of Vb, Vb exports to on-off circuit after the filter network filtering of the first capacitor C 1 and the second resistance R 2 compositions.
Signal processing module on-off circuit conceptual scheme as shown in Figure 5.Switching signal is inputted by triode Q1 base stage, by controlling conducting and the cut-off of Q1, signal is exported by the collector of Q1, is further filtering clutter signal, after the filter network filtering consisting of again, exports to instrument after collector output the 4th resistance R 4, the second capacitor C 2.Wherein, this circuit is connected with 5V power supply by the 5th resistance R 5.
The strategy that the utility model signal processing module docks with instrument system is: when the residing liquid level of liquid level sensor reduces, the equivalent resistance of the liquid level signal of liquid level sensor output becomes large, in closed circuit, the magnitude of voltage at liquid level sensor two ends becomes large thereupon, when this magnitude of voltage is greater than the magnitude of voltage of reference signal, signal comparator circuit output high level voltage state, on-off circuit conducting, on-off circuit output low level voltage status, instrument system collects after the low level fluid level condition of this signaling module output, for accurate judgement liquid level is not because the reasons such as automobile bumpiness cause level fluctuation or the special state such as liquid level is critical lower than reference liquid level, instrument system postpones 40s, after 40s, instrument system gathers the fluid level condition signal of this signaling module output again, if fluid level condition is corresponding low level voltage state still, instrument system is just made this liquid level signal useful signal and is processed, the too low alarm lamp of instrument drive hummer and liquid level carries out sound and light alarm, remind driver's liquid level too low.Otherwise instrument system is not carried out sound and light alarm.
Claims (2)
1. the signal processing module based on liquid level sensor, is characterized in that: comprise 12V power supply (1-1), 5V power supply (1-2), signal acquisition circuit (1-3), signal reference data circuit (1-4), signal comparator circuit (1-5) and on-off circuit (1-6); Wherein, 12V power supply (1-1) output terminal is connected with signal acquisition circuit (1-3), signal reference data circuit (1-4) and the power input of signal comparator circuit (1-5) respectively; 5V power supply (1-2) output terminal is connected with the power input of on-off circuit (1-6); Signal acquisition circuit (1-3) output terminal is connected with the positive input of signal comparator circuit (1-5), signal reference data circuit (1-4) output terminal is connected with the negative input of signal comparator circuit (1-5), and the output terminal of signal comparator circuit (1-5) is connected with the input end of on-off circuit (1-6); The output terminal of on-off circuit (1-6) is connected with instrument associated end.
2. the signal processing module based on liquid level sensor according to claim 1, it is characterized in that: described signal acquisition circuit (1-3) consists of Transient Suppression Diode (D2), the 8th resistance (R8), liquid level sensor (Rt1), after Transient Suppression Diode (D2) is in parallel with liquid level sensor (Rt1), connect with the 8th resistance (R8), described signal reference data circuit (1-4) is in series by the 6th resistance (R6) and the 7th resistance (R7), described signal comparator circuit (1-5) is by the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 9th resistance (R9), the tenth resistance (R10), the first electric capacity (C1), the 3rd electric capacity (C3), the 4th electric capacity (C4), comparer (U1A) forms, the tenth resistance (R10) and the 3rd electric capacity (C3) are connected with comparer (U1A) positive input, the 9th resistance (R9) and the 4th electric capacity (C4) are connected with comparer (U1A) negative input, one end of the first resistance (R1) is connected with power supply, the other end of the first resistance (R1) is connected with one end and comparer (U1A) output terminal of the second resistance (R2), the other end of the second resistance (R2) is connected with a common port of the 3rd resistance (R3) and the first electric capacity (C1), described on-off circuit (1-6) consists of triode (Q1), the 4th resistance (R4), the 5th resistance (R5) and the second electric capacity (C2).
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| CN201420415011.1U CN204007789U (en) | 2014-07-27 | 2014-07-27 | Signal processing module based on liquid level sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504676A (en) * | 2017-09-22 | 2017-12-22 | 北京中科传能环保技术有限公司 | Gas fired-boiler with purification function |
| CN110006501A (en) * | 2018-11-06 | 2019-07-12 | 柳工常州机械有限公司 | Bull-dozer level monitoring control circuit and its monitoring method with anti-error correcting capability |
| CN112653362A (en) * | 2020-12-15 | 2021-04-13 | 上海航天计算机技术研究所 | High-voltage energy consumption braking power distribution equipment of electric servo mechanism |
| CN112665687A (en) * | 2020-11-26 | 2021-04-16 | 中国核动力研究设计院 | Electric contact liquid level signal acquisition method and system with adjustable hysteresis function |
-
2014
- 2014-07-27 CN CN201420415011.1U patent/CN204007789U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504676A (en) * | 2017-09-22 | 2017-12-22 | 北京中科传能环保技术有限公司 | Gas fired-boiler with purification function |
| CN110006501A (en) * | 2018-11-06 | 2019-07-12 | 柳工常州机械有限公司 | Bull-dozer level monitoring control circuit and its monitoring method with anti-error correcting capability |
| CN112665687A (en) * | 2020-11-26 | 2021-04-16 | 中国核动力研究设计院 | Electric contact liquid level signal acquisition method and system with adjustable hysteresis function |
| CN112653362A (en) * | 2020-12-15 | 2021-04-13 | 上海航天计算机技术研究所 | High-voltage energy consumption braking power distribution equipment of electric servo mechanism |
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Address after: 441000 Jiangshan South Road Venture Center, Xiangyang High-tech Zone, Hubei Province Patentee after: Dongfeng Power Drive System Co., Ltd. Address before: 441001 No. 227 Daqing East Road, Xiangfan City, Hubei Province Patentee before: DONGFENG AUTOMOBILE ELECTRONICS CO., LTD. |