CN103939256A - Self-adaptation ionic current detecting device - Google Patents
Self-adaptation ionic current detecting device Download PDFInfo
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- CN103939256A CN103939256A CN201410112027.XA CN201410112027A CN103939256A CN 103939256 A CN103939256 A CN 103939256A CN 201410112027 A CN201410112027 A CN 201410112027A CN 103939256 A CN103939256 A CN 103939256A
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Abstract
The invention provides a self-adaptation ionic current detecting device which comprises an ignition isolation module, a high-voltage isolation module, a bias power supply module, a voltage dividing module, a signal preprocessing module and a variable resistance module. One end of the ignition isolation module is connected with an ignition module of an engine, and the other end of the ignition isolation module is connected with the input end of an ignition plug of the engine and is connected with one end of the high-voltage isolation module. The other end of the high-voltage isolation module is connected with a positive electrode of the bias power supply module. A negative electrode of the bias power supply module is connected with one end of the voltage dividing module. The other end of the voltage dividing module is connected with the output end of the variable resistance module which is provided with an engine combustion mode control signal receiving end, and the output end of the voltage dividing module is connected with the input end of the signal preprocessing module. The self-adaptation ionic current detecting device can carry out effective isolation on interference from ignition, high voltage, a background and the like, self adaptation on engine SI/SCCI mode switching is achieved, and the ionic current of an internal combustion engine cylinder inner combustion state can be detected accurately and completely in real time.
Description
Technical field
The invention belongs to technical field of internal combustion engines, relate to a kind of device that detects combustion in IC engine state.
Background technique
Engine combustion process depends on the comprehensive functions such as the physics and chemistry of mixed gas in cylinder, for the combustion process of control engine, needs a Real-time Feedback signal to determine the state of burning.The information that ion current signal comprises a large amount of motor in-cylinder combustions and running, by signals collecting and processing, can obtain needed combustion information the closed loop control for combustion process.The size of ionic current is relevant with instantaneous local ion concentration, and the size of local ion concentration depends on that in-cylinder combustion chemical reaction generates the ability of ion on the one hand, depends on the other hand mixture strength local in cylinder.Therefore can make the factor that in cylinder, local ion concentration changes detect by ionic current.By the research of the time domain to ionic current and frequency-region signal, just can quantitatively and qualitatively disclose cylinder combustion and burn the character of process, obtain cylinder combustion and burn the abundant information of process, as ignition timing, pinking and air fuel ratio etc., or utilize ion current signal to carry out analysis of combustion.
Particularly when engine operation is at HCCI(homogeneous compression-ignition) when pattern, burning is subject to the control of gas chemistry reactive rate completely, according to Chemical Kinetics theory, involuntary ignition is to rely on the slow oxidative reaction of inflammable mixture self to accumulate gradually heat energy and activated molecule, thereby accelerated reaction voluntarily, finally cause burning, and oxidizing fire process is accompanied by chemi-ionization process, therefore, ionic current sensory technique is compared other sensing detection technology, in the time that HCCI ignition timing and rate of burning are controlled in research, there is obvious advantage.
In addition, when engine operation is in SI(spark ignition) when pattern, under the state of in-cylinder combustion and HCCI pattern, there were significant differences, due to the mixture equivalence difference under two kinds of combustion modes, under identical bias voltage, cause the intensity of ionic current to have a great difference, if obtain the ionic current of same intensity, need provide different bias voltages.
The Chinese invention patent " spark plug ion current detection circuit " that on August 6th, 2008, disclosed publication number was 2010968827 discloses a kind of spark plug ion current detection circuit, and its circuit theory diagrams as shown in Figure 1.This invention can make the ionic current detecting isolate the impact of igniting electric discharge completely, apply constant bias voltage, the ionic current obtaining can reflect motor in-cylinder combustion state comparatively exactly, but this circuit has good precision can only be to motor single mode of operation time, and for engine operation under SI/HCCI multi-mode time, circuit cannot carry out self adaption, has significant limitation.
In addition, the working environment of motor has determined that it all may be subject to the electromagnetic interference in the interior external world at any time, this interference may be with the form metering-in control system inside of shock pulse, hinder and damage the work of some electronic device, also may seal in sensor signal with the form of noise, affect the judgement of control system to motor operation conditions.When the mode of operation of motor during to the transition of HCCI combustion mode, must have spark ignition by SI combustion mode.Owing to adopting spark plug as ion current sensor, igniting electric discharge is disturbed and will inevitably significantly be affected ion current signal waveform.Work reliably and obtain desirable ion current signal in order to ensure system, must take into full account the anti-interference of whole ionic current detection system.
Summary of the invention
The object of the present invention is to provide a kind of ionic current testing circuit that all can detect accurately and real-time internal-combustion engine in-cylinder combustion state under motor SI/SCCI multi-mode.
In order to achieve the above object, solution of the present invention is:
A kind of self adaption ionic current detection device, comprises igniting isolation module, high pressure isolation module, bias supply module, division module, signal pre-processing module and variable resistor module; Wherein, the ignition module of one end connecting engine of described igniting isolation module, the other end is the input end of connecting engine spark plug both, connects again one end of described high pressure isolation module, disturbs to isolate igniting; The other end of described high pressure isolation module connects the positive pole of described bias supply module, disturbs with isolated high-voltage; The negative pole of described bias supply module connects one end of described division module, and the other end of described division module connects the input end of described variable resistor module; The output terminal of described variable resistor module connects the input end of described signal pre-processing module; Described variable resistor module has engine combustion mode control signal receiving terminal.
Described igniting isolation module comprises igniting isolation capacitance.
Described igniting isolation capacitance is ceramic condenser.
The capacitance of described ceramic condenser is 5 pico farads.
Described high pressure isolation module comprises the high voltage silicon rectifier stack and the resistance R that are connected in parallel
1, the input end of the just very described high pressure isolation module of described high voltage silicon rectifier stack, the centre electrode of connecting engine spark plug, negative pole is the output terminal of described high pressure isolation module, connects the positive pole of described bias supply module.
The model of described high voltage silicon rectifier stack is 2CL2FK, and breakdown reverse voltage is 40 kilovolts; Described resistance R
1resistance be 10 megaohms.
Described bias supply module comprises a power supply.
Described division module comprises resistance R
2, resistance R
3and resistance R
4, wherein said resistance R
3with described resistance R
4parallel connection, and entirety and described resistance R
2series connection; Described resistance R
2the other end connect the negative pole of described bias supply module, described resistance R
3with described resistance R
4the other end connect described variable resistor module.
Described signal pre-processing module comprises by resistance R
5and capacitor C
2the RC low-pass filter circuit being composed in series, and described capacitor C
2two ends as the output terminal of described signal pre-processing module.
Described variable resistor module comprises not gate and two field effect transistor T
1and T
2; Wherein, described field effect transistor T
1drain electrode connect described resistance R
3, described field effect transistor T
2drain electrode connect described resistance R
4; Described field effect transistor T
1grid connect the output terminal of described not gate; Described field effect transistor T
2grid connect the input end of described not gate; The input end of described not gate is described engine combustion mode control signal receiving terminal, and the issuing side of connecting engine combustion mode control signal, to receive the combustion mode control signal of motor.
Owing to adopting such scheme, the invention has the beneficial effects as follows: self adaption ionic current detection device of the present invention adopts certain quarantine measures, effectively the interference such as igniting, high pressure and background is isolated; Introduce variable resistance circuit simultaneously, realized easily and effectively the self adaption that motor SI/SCCI pattern is switched, can detect complete, accurately and real-time the ionic current of internal-combustion engine in-cylinder combustion state, there is higher validity.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of spark plug ion current detection circuit in prior art;
Fig. 2 is the circuit theory diagrams of self adaption ionic current detection device in the embodiment of the present invention;
Fig. 3 is the circuit theory diagrams of the self adaption ionic current detection device mesohigh isolation module of the embodiment of the present invention;
Fig. 4 is the circuit theory diagrams of bleeder circuit in the self adaption ionic current detection device of the embodiment of the present invention;
Fig. 5 is the circuit theory diagrams of variable resistance circuit in the self adaption ionic current detection device of the embodiment of the present invention;
Fig. 6 is the circuit theory diagrams of signal pre-processing circuit in the self adaption ionic current detection device of the embodiment of the present invention.
In accompanying drawing: 1, spark plug; 2, ignition module; 3, isolation capacitance; 4, external bias supply; 5, high pressure isolation module; 6, bleeder circuit; 7, variable resistance circuit; 8, signal pre-processing circuit; 9, not gate.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
The present invention proposes one can carry out adaptivity adjustment according to engine combustion pattern, all can keep the self adaption ionic current detection device of higher precision under motor SI/HCCI multi-mode.This device comprises isolation capacitance 3, external bias supply 4, high pressure isolation module 5, bleeder circuit 6, variable resistance circuit 7 and signal pre-processing circuit 8, and its circuit theory diagrams as shown in Figure 2.Wherein, the output terminal of the ignition module 2 of one end connecting engine of isolation capacitance 3, the input end of the spark plug 1 of the other end connecting engine and the input end of high pressure isolation module 5, and the output terminal of high pressure isolation module 5 connects the positive pole of external bias supply 4, the negative pole of external bias supply 4 connects one end of bleeder circuit 6; The other end of bleeder circuit 6 connects the input end of variable resistance circuit 7, and the output terminal of variable resistance circuit 7 connects the input end of signal pre-processing circuit 8.
High pressure isolation module 5 comprises high voltage silicon rectifier stack and large resistance high-tension resistive R
1, and high voltage silicon rectifier stack and high-tension resistive R
1parallel connection, its circuit theory diagrams as shown in Figure 3.Wherein, the model of high voltage silicon rectifier stack is 2CL2FK, and breakdown reverse voltage is 40 kilovolts (kV), high-tension resistive R
1resistance be 10 megaohms (M Ω); The just very input end of this high pressure isolation module 5 of high voltage silicon rectifier stack, negative pole is its output terminal; Its output terminal is connected with the positive pole of external bias supply 4, and input end is connected with the centre electrode of spark plug 1, isolates the impacting with high pressure that spark plug 1 igniting produces, protection testing circuit with this.High-tension resistive has the characteristic that high pressure resistant high-frequency voltage impacts, and therefore, in the time that high voltage silicon rectifier stack is ineffective, high-tension resistive also can play the effect of protection testing circuit.
Bleeder circuit comprises resistance R
2, resistance R
3and resistance R
4, wherein resistance R
3and resistance R
4parallel connection, then entirety and resistance R
2series connection, its circuit theory diagrams as shown in Figure 4.The ionic current that this detection device detects is via resistance R
3or resistance R
4change voltage signal into and enter into signal pre-processing circuit 8.
Variable resistance circuit 7 comprises field effect transistor (metal-oxide-semiconductor) T
1, field effect transistor (metal-oxide-semiconductor) T
2with not gate 9.Wherein, metal-oxide-semiconductor T
1drain electrode and resistance R
3input end connect, metal-oxide-semiconductor T
2drain electrode and resistance R
4input end connect; Metal-oxide-semiconductor T
1grid AND NOT gate 9 output terminal connect, metal-oxide-semiconductor T
2grid AND NOT gate 9 input end connect.In addition, the input end of not gate 9 is also connected with the issuing side of engine combustion mode control signal, receives the combustion mode control signal from single-chip microcomputer.Thereby if engine operation is low level in the control signal of SI combustion mode, and the control signal that is operated in HCCI combustion mode is high level, R
3for the detection resistance under SI pattern, R
4for the detection resistance under HCCI pattern.The circuit theory diagrams of this variable resistance circuit 7 as shown in Figure 5.
Signal pre-processing circuit comprises resistance R
5and capacitor C
2, wherein resistance R
5with capacitor C
2be composed in series RC low-pass filter, to filter the ambient interferences of high frequency, and capacitor C
2two ends be connected in rear class signal processing circuit, so that the voltage signal at its two ends is input in rear class signal processing circuit.The circuit theory diagrams of this signal pre-processing circuit as shown in Figure 6.
In order to get rid of spark plug 1 interference of igniting electric discharge to ion current signal waveform generation, the ceramic condenser C of 5 pico farads (pf) of contacting between spark plug 1 and high voltage silicon rectifier stack
1, disturb to suppress igniting.
When engine operation is during in SI combustion mode, combustion mode control signal output low level, the output terminal of not gate 9 is high level, now metal-oxide-semiconductor T
1grid be high level, metal-oxide-semiconductor T
2grid be low level, divider resistance R
3detect resistance access circuit as ionic current, in the time of spark plug 1 igniting electric discharge, high pressure isolation module 5 and isolation capacitance 3 carry out high pressure isolation and igniting isolation effectively, ensure via obtaining accurate ion current signal after bleeder circuit 6 and signal pre-processing circuit 8.
When engine operation is during in HCCI combustion mode, combustion mode control signal output high level, the output terminal of not gate 9 is low level, now metal-oxide-semiconductor T
1grid be low level, metal-oxide-semiconductor T
2grid be high level, divider resistance R
4detect resistance access circuit as ionic current, ion current signal is via the electronic control unit (ECU) of inputting rear class signal processing circuit and motor after signal pre-processing circuit 8 lower pass-filters.
In summary, self adaption ionic current detection device of the present invention adopts certain quarantine measures, effectively the interference such as igniting, high pressure and background is isolated; Introduce variable resistance circuit simultaneously, realized easily and effectively the self adaption that motor SI/SCCI pattern is switched, can detect complete, accurately and real-time the ionic current of internal-combustion engine in-cylinder combustion state, there is higher validity.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various amendments to these embodiments, and General Principle described herein is applied in other embodiments and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from improvement and the amendment that category of the present invention makes all should be within protection scope of the present invention.
Claims (10)
1. a self adaption ionic current detection device, is characterized in that: comprise igniting isolation module, high pressure isolation module, bias supply module, division module, signal pre-processing module and variable resistor module;
The ignition module of one end connecting engine of described igniting isolation module, the other end is the input end of connecting engine spark plug both, connects again one end of described high pressure isolation module, disturbs to isolate igniting; The other end of described high pressure isolation module connects the positive pole of described bias supply module, disturbs with isolated high-voltage; The negative pole of described bias supply module connects one end of described division module, and the other end of described division module connects the input end of described variable resistor module; The output terminal of described variable resistor module connects the input end of described signal pre-processing module; Described variable resistor module has engine combustion mode control signal receiving terminal.
2. self adaption ionic current detection device according to claim 1, is characterized in that: described igniting isolation module comprises igniting isolation capacitance.
3. self adaption ionic current detection device according to claim 2, is characterized in that: described igniting isolation capacitance is ceramic condenser.
4. self adaption ionic current detection device according to claim 3, is characterized in that: the capacitance of described ceramic condenser is 5 pico farads.
5. self adaption ionic current detection device according to claim 1, is characterized in that: described high pressure isolation module comprises the high voltage silicon rectifier stack and the resistance R that are connected in parallel
1, the input end of the just very described high pressure isolation module of described high voltage silicon rectifier stack, the centre electrode of connecting engine spark plug, negative pole is the output terminal of described high pressure isolation module, connects the positive pole of described bias supply module.
6. self adaption ionic current detection device according to claim 5, is characterized in that: the model of described high voltage silicon rectifier stack is 2CL2FK, breakdown reverse voltage is 40 kilovolts; Described resistance R
1resistance be 10 megaohms.
7. self adaption ionic current detection device according to claim 1, is characterized in that: described bias supply module comprises a power supply.
8. self adaption ionic current detection device according to claim 1, is characterized in that: described division module comprises resistance R
2, resistance R
3and resistance R
4, wherein said resistance R
3with described resistance R
4parallel connection, and entirety and described resistance R
2series connection; Described resistance R
2the other end connect the negative pole of described bias supply module, described resistance R
3with described resistance R
4the other end connect described variable resistor module.
9. self adaption ionic current detection device according to claim 1, is characterized in that: described signal pre-processing module comprises by resistance R
5and capacitor C
2the RC low-pass filter circuit being composed in series, and described capacitor C
2two ends as the output terminal of described signal pre-processing module.
10. self adaption ionic current detection device according to claim 8, is characterized in that: described variable resistor module comprises not gate and two field effect transistor T
1and T
2; Wherein, described field effect transistor T
1drain electrode connect described resistance R
3, described field effect transistor T
2drain electrode connect described resistance R
4; Described field effect transistor T
1grid connect the output terminal of described not gate; Described field effect transistor T
2grid connect the input end of described not gate; The input end of described not gate is described engine combustion mode control signal receiving terminal, and the issuing side of connecting engine combustion mode control signal, to receive the combustion mode control signal of motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410112027.XA CN103939256A (en) | 2014-03-24 | 2014-03-24 | Self-adaptation ionic current detecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410112027.XA CN103939256A (en) | 2014-03-24 | 2014-03-24 | Self-adaptation ionic current detecting device |
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| CN103939256A true CN103939256A (en) | 2014-07-23 |
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|---|---|---|---|
| CN201410112027.XA Pending CN103939256A (en) | 2014-03-24 | 2014-03-24 | Self-adaptation ionic current detecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546632A (en) * | 2016-10-26 | 2017-03-29 | 北京航空航天大学 | The measurement apparatus and method of combustion field intermediate ion concentration distribution |
| CN106593701A (en) * | 2016-12-09 | 2017-04-26 | 同济大学 | Cylinder internal water spraying detection control system for gasoline engine and application of cylinder internal water spraying detection control system |
| CN110285003A (en) * | 2019-07-08 | 2019-09-27 | 上海戴世智能科技有限公司 | Engine ionic current detection module, detection method, engine pack and vehicle |
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| JPH09100772A (en) * | 1995-10-04 | 1997-04-15 | Denso Corp | Misfire detection device of internal combustion engine |
| US20020158615A1 (en) * | 2000-10-13 | 2002-10-31 | Ryan Goodfellow | System and method for current sensing |
| CN201096827Y (en) * | 2007-11-01 | 2008-08-06 | 中国人民解放军军事交通学院 | Spark plug ion current detection circuit |
| CN203672947U (en) * | 2013-12-24 | 2014-06-25 | 同济大学 | Self-adaption ion current detection device |
-
2014
- 2014-03-24 CN CN201410112027.XA patent/CN103939256A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09100772A (en) * | 1995-10-04 | 1997-04-15 | Denso Corp | Misfire detection device of internal combustion engine |
| US20020158615A1 (en) * | 2000-10-13 | 2002-10-31 | Ryan Goodfellow | System and method for current sensing |
| CN201096827Y (en) * | 2007-11-01 | 2008-08-06 | 中国人民解放军军事交通学院 | Spark plug ion current detection circuit |
| CN203672947U (en) * | 2013-12-24 | 2014-06-25 | 同济大学 | Self-adaption ion current detection device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546632A (en) * | 2016-10-26 | 2017-03-29 | 北京航空航天大学 | The measurement apparatus and method of combustion field intermediate ion concentration distribution |
| CN106546632B (en) * | 2016-10-26 | 2020-01-03 | 北京航空航天大学 | Device and method for measuring ion concentration distribution in combustion field |
| CN106593701A (en) * | 2016-12-09 | 2017-04-26 | 同济大学 | Cylinder internal water spraying detection control system for gasoline engine and application of cylinder internal water spraying detection control system |
| CN106593701B (en) * | 2016-12-09 | 2019-06-11 | 同济大学 | A kind of gasoline engine in-cylinder water injection detecting and controlling system and its application |
| CN110285003A (en) * | 2019-07-08 | 2019-09-27 | 上海戴世智能科技有限公司 | Engine ionic current detection module, detection method, engine pack and vehicle |
| CN110285003B (en) * | 2019-07-08 | 2022-03-18 | 上海戴世智能科技有限公司 | Engine ionic current detection module, detection method, engine assembly and vehicle |
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Application publication date: 20140723 |