CN203672947U - Self-adaption ion current detection device - Google Patents
Self-adaption ion current detection device Download PDFInfo
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- CN203672947U CN203672947U CN201320860893.8U CN201320860893U CN203672947U CN 203672947 U CN203672947 U CN 203672947U CN 201320860893 U CN201320860893 U CN 201320860893U CN 203672947 U CN203672947 U CN 203672947U
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- 238000001514 detection method Methods 0.000 title abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 44
- 238000002955 isolation Methods 0.000 claims abstract description 42
- 238000007781 pre-processing Methods 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 239000004065 semiconductor Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model provides a self-adaption ion current detection device. The self-adaption ion current detection device comprises an igniting isolation module, a high voltage isolation module, a bias power source module, a voltage division module, a signal pre-processing module and a variable resistor module, wherein one end of the igniting isolation module is connected with an igniting module of an engine, the other end of the igniting isolation module is connected with an input end of an engine spark plug and is further connected with one end of the high voltage isolation module, the other end of the high voltage isolation module is connected with an anode of the bias power source module, a cathode of the bias power source module is connected with one end of the voltage division module, the other end of the voltage division module is connected with an output end of the variable resistor module, the variable resistor module has an engine combustion mode control signal receiving end, and an output end of the variable resistor module is connected with an input end of the signal pre-processing module. The self-adaption ion current detection device can effectively isolate igniting, high voltage and background interferences, realizes self-adaptation to engine SI/SCCI mode switching and can completely and accurately detect the ion current of a combustion state of an internal combustion engine in real time.
Description
Technical field
The utility model belongs to technical field of internal combustion engines, relates to a kind of device that detects combustion in IC engine state.
Background technology
Engine combustion process depends on the combined actions such as the physics and chemistry of combination 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 engine 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 gas 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 gas current.By the research of the time domain to gas 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(homogeneity compression-ignition) when pattern, burning is subject to the control of gas chemistry reaction rate completely, according to Chemical Kinetics theory, involuntary ignition is to rely on the slow oxidative reaction of combustion 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, gas current sensing technology is compared other sensing detection technology, in the time that HCCI ignition timing and combustion rate 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 gas current to have a great difference, if obtain the gas current of same intensity, need provide different bias voltages.
The Chinese utility model 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 utility model can make the gas current detecting isolate the impact of igniting electric discharge completely, apply constant bias voltage, the gas current obtaining can reflect engine in-cylinder combustion state comparatively exactly, but this circuit has good precision can only be to engine single mode of operation time, and for engine operation under SI/HCCI multi-mode time, circuit cannot carry out self-adaptation, has significant limitation.In addition, the working environment of engine has determined that it all may be subject to the electromagnetic interference (EMI) 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 electron device, also may seal in sensor signal with the form of noise, affect the judgement of control system to engine operation conditions.When the mode of operation of engine 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 will inevitably appreciable impact 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 gas current detection system.
Utility model content
The purpose of this utility model is to provide a kind of gas current testing circuit that all can detect accurately and real-time internal combustion engine in-cylinder combustion state under engine SI/SCCI multi-mode.
In order to achieve the above object, solution of the present utility model is:
A kind of self-adaptation gas current pick-up unit, 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 end.
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 central 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 end, and the issuing side of connecting engine combustion mode control signal, to receive the combustion mode control signal of engine.
Owing to adopting such scheme, the beneficial effects of the utility model are: the utility model self-adaptation gas current pick-up unit 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-adaptation that engine SI/SCCI pattern is switched, can detect complete, accurately and real-time the gas current of internal combustion engine in-cylinder combustion state, there is higher degree of accuracy.
Accompanying drawing explanation
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-adaptation gas current pick-up unit in the utility model embodiment;
Fig. 3 is the circuit theory diagrams of the self-adaptation gas current pick-up unit mesohigh isolation module of the utility model embodiment;
Fig. 4 is the circuit theory diagrams of bleeder circuit in the self-adaptation gas current pick-up unit of the utility model embodiment;
Fig. 5 is the circuit theory diagrams of variable resistance circuit in the self-adaptation gas current pick-up unit of the utility model embodiment;
Fig. 6 is the circuit theory diagrams of signal pre-processing circuit in the self-adaptation gas current pick-up unit of the utility model embodiment.
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 utility model is further described.
The utility model proposes one can carry out adaptivity adjustment according to engine combustion pattern, all can keep the self-adaptation gas current pick-up unit of higher precision under engine 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 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 central 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 HF voltage is impacted, 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 gas current that this pick-up unit detects is via resistance R
3or resistance R
4change voltage signal into and enter into signal pre-processing circuit 8.
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 background interference 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 gas 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, guarantee 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 gas current, ion current signal is via the electronic control unit (ECU) of inputting rear class signal processing circuit and engine after signal pre-processing circuit 8 low-pass filtering.
In summary, the utility model self-adaptation gas current pick-up unit 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-adaptation that engine SI/SCCI pattern is switched, can detect complete, accurately and real-time the gas current of internal combustion engine in-cylinder combustion state, there is higher degree of accuracy.
The above-mentioned description to embodiment is can understand and apply the utility model for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the utility model is not limited to the embodiment here, and those skilled in the art are according to announcement of the present utility model, and not departing from the improvement that the utility model category makes and revise all should be within protection domain of the present utility model.
Claims (10)
1. a self-adaptation gas current pick-up unit, 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 end.
2. self-adaptation gas current pick-up unit according to claim 1, is characterized in that: described igniting isolation module comprises igniting isolation capacitance.
3. self-adaptation gas current pick-up unit according to claim 2, is characterized in that: described igniting isolation capacitance is ceramic condenser.
4. self-adaptation gas current pick-up unit according to claim 3, is characterized in that: the capacitance of described ceramic condenser is 5 pico farads.
5. self-adaptation gas current pick-up unit 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 central 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-adaptation gas current pick-up unit 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-adaptation gas current pick-up unit according to claim 1, is characterized in that: described bias supply module comprises a power supply.
8. self-adaptation gas current pick-up unit 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-adaptation gas current pick-up unit 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-adaptation gas current pick-up unit 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 end, and the issuing side of connecting engine combustion mode control signal, to receive the combustion mode control signal of engine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320860893.8U CN203672947U (en) | 2013-12-24 | 2013-12-24 | Self-adaption ion current detection device |
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|---|---|---|---|
| CN201320860893.8U CN203672947U (en) | 2013-12-24 | 2013-12-24 | Self-adaption ion current detection device |
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| CN203672947U true CN203672947U (en) | 2014-06-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939256A (en) * | 2014-03-24 | 2014-07-23 | 同济大学 | Self-adaptation ionic current detecting device |
| CN106383275A (en) * | 2016-08-18 | 2017-02-08 | 四川泛华航空仪表电器有限公司 | Engine ignition capacitor aging test fault detection device |
-
2013
- 2013-12-24 CN CN201320860893.8U patent/CN203672947U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939256A (en) * | 2014-03-24 | 2014-07-23 | 同济大学 | Self-adaptation ionic current detecting device |
| CN106383275A (en) * | 2016-08-18 | 2017-02-08 | 四川泛华航空仪表电器有限公司 | Engine ignition capacitor aging test fault detection device |
| CN106383275B (en) * | 2016-08-18 | 2023-05-12 | 四川泛华航空仪表电器有限公司 | Fault detection device for aging test of engine ignition capacitor |
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| GR01 | Patent grant |