CN101260838B - Broad domain oxygen sensor controller of vehicular gaseous propellant engine - Google Patents
Broad domain oxygen sensor controller of vehicular gaseous propellant engine Download PDFInfo
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- CN101260838B CN101260838B CN2008101046986A CN200810104698A CN101260838B CN 101260838 B CN101260838 B CN 101260838B CN 2008101046986 A CN2008101046986 A CN 2008101046986A CN 200810104698 A CN200810104698 A CN 200810104698A CN 101260838 B CN101260838 B CN 101260838B
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Abstract
The invention discloses a controller for a wide-band oxygen sensor for a vehicular gas fuel engine, which comprises a power supply module (3), a heating module (4) and a control module consisting of a signal amplification module (5), a signal determination module (6), a feedback control module (7) and an output amplification module (8). The controller receives and amplifies feedback voltage (Vs) of the oxygen sensor, and outputs VsAf1 and VsAf2; the VsAf1 generates V1 and Vju through the signal determination module; the VsAf2 and the Vju generate V2 through the feedback control module and output Vout via amplification. Pump current (IP) in different directions is generated through determining whether air-fuel ratio is 1 or not and enabling two sides with the air-fuel ratio in 1 to be provided with voltage signals in different directions. Signals of the wide-band oxygen sensor change in the range between 0 and 5V after passing through a back end processor, and output signals and the air-fuel ratio are in a perfect linear relation. The engine can implement the closed-loop control during the transitional working condition.
Description
Technical field
The present invention relates to a kind of structure and design that is applied to automobile with the controller of the broad domain oxygen sensor of gaseous propellant engine.
Background technique
Current automotive industry has obtained development fast.Entered since the eighties in 20th century, the average annual growth rate of world's vehicle guaranteeding organic quantity is about 3%.A large amount of automobiles has also brought many negative effects when offering convenience to life, distinct issues are exactly the exhaust pollution of automobile in these influences.Among the more and more serious now atmospheric pollution, vehicular emission has become fastest-rising air pollution source.In a lot of cities, automobile gas emission pollution has become the main source of air pollutant.For the Control of Automobile exhaust emissions, automobile develops into electron spraying system by traditional Carburetor, adopts the air fuel ratio close-loop feedback control system that has lambda sensor and three-way catalytic converter.Wherein, lambda sensor plays an important role for improving combustion efficiency, reduction discharge amount of pollution and three-element catalytic.Lambda sensor is the core component in the electric-control motor auxiliary fuel supply-system, in order to detect the oxygen concentration in the exhausting air, whether the mixed gas in the monitoring cylinder burns by the air fuel ratio of setting, and in real time to the ECU feedback, ECU then carries out the correction of fuel injection amount according to feedback signal.At present, the market lambda sensor product of getting on the car is divided into chemically correct fuel lambda sensor, lean air fuel ratio lambda sensor, wide range air/fuel ratio oxygen sensor or the like by its application.In order to realize lower discharging, for diesel engine and gas engine, need to adopt lean combustion, at this moment just need to adopt broad domain oxygen sensor could realize the feedback control of air fuel ratio.Broad domain oxygen sensor needs to cooperate the signal processing apparatus competence exertion effect that is complementary with it in the application of reality.This signal processing apparatus is different from general sensor back end signal amplifier, not only needs to realize signal filtering and enlarging function, but also needs to realize SC sigmal control and add the heat control function, thereby comparatively complicated.Have the introduction of principle in the design of the present this respect of China, as at " motor car engine fuel supply and adjusting " (Lu Jiqing, Liu Zheng etc., publishing house of Tsing-Hua University, 2002) in the book (P139), the basic principle and the structure of wide territory air-fuel ratio sensor have been mentioned, the function of its controller and basic working procedure have also been related to, it promptly is benchmark with 450mV, output voltage to the oxygen sensing film sheet carries out closed loop control, the exhaust oxygen content of keeping when oxygen content gas is with excess air coefficient in the sensing chamber equates, at this moment just knows the air fuel ratio of mixed gas by testing pump sense of current and size.But this book is for the internal structure and the not explanation of implementation of controller.Abroad, though practical product is arranged at present, do not see the open report that its design aspect is arranged.
Summary of the invention
In motor, bring into play the effect of lean-burn air fuel ratio closed loop control in order to make broad domain oxygen sensor, the present invention has designed a kind of controller of broad domain oxygen sensor, realization is to filtering, amplification and the feedback control of the air fuel ratio output signal of broad domain oxygen sensor, the heat control that adds can also be realized, and then the performance of gaseous propellant engine can be effectively improved broad domain oxygen sensor.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of broad domain oxygen sensor controller of vehicular gaseous propellant engine is made up of heating module, power module and control module; Control module is made up of signal amplification module, signal judge module, feedback control module and output amplification module.
Described control module is connected into by signal amplification module, signal judge module, feedback control module, output amplification module, being connected between its each several part:
The also contact of first and second resistance in the signal amplification circuit and 15 electric capacity is connected with the delivery outlet of the feedback voltage signal of broad domain oxygen sensor;
38 resistance in the signal amplification circuit and 22 electric capacity and contact and signal judge module in the in-phase input end of 16 operational amplifiers and the inverting input of 15 operational amplifiers be connected;
The output terminal of 13 operational amplifiers in the signal amplification circuit and 12 resistance and contact and feedback control module in 13 resistance and the also contact of 14 resistance be connected;
The inverting input of 16 operational amplifier output terminals in the signal judge module and ten nine operational amplifiers of output in the amplification module and 25 resistance and contact be connected;
In the feedback control module, the collector electrode of triode is connected with an end of 23 resistance of output in the amplification module; The output terminal of 18 operational amplifiers in the feedback control module connects through the pump electric current delivery outlet of 21 resistance broad domain oxygen sensors;
In the output amplifier, the output terminal of 19 operational amplifiers is connected with ECU through 39 resistance.
The broad domain oxygen sensor controller workflow is: controller is accepted broad domain oxygen sensor output signal Vs and since signal a little less than, it is amplified, judge with the size of amplified signal whether excess air coefficient is 1.The broad domain oxygen sensor output signal is carried out conversion, and making excess air coefficient is the voltage signal that there is different direction 1 both sides, produces the pump electric current of different direction.Signal counter-rotating after by logical operation the lambda sensor output signal being amplified is again amplified.When excessive air coefficient is not equal to 1, will receive the feedback control module input end through the voltage signal of previous processed, this module changes the size of pump electric current I p, detects its variation and converts thereof into voltage signal.When excess air coefficient is 1, the output voltage V ju of signal judge module will make feedback control module stop logical the work, thereby directly export V1, and promptly output voltage is 2.50V.The voltage signal that obtains so can be linear the reflection excess air coefficient, when excessive air coefficient changes around 1, it characterizes voltage signal is about 2.50V, when excessive air coefficient less than 1 or greater than 1 the time, the gained signal changes in the scope of 0～5V.
Beneficial effect of the present invention: the signal of broad domain oxygen sensor will change in the scope at 0～5V after through signal amplification and control, output signal and air fuel ratio are comparatively desirable linear relationship, can realize the heat control that adds to broad domain oxygen sensor, it can reliablely and stablely be worked, and then can realize air-fuel ratio feedback control, make motor realize lean combustion, improve the Economy and the emission performance of motor.
Description of drawings
Fig. 1 broad domain oxygen sensor controller is formed structural drawing.
Fig. 2 controller logic workflow diagram.
Fig. 3 heating module Placement figure.
Fig. 4 power module Placement figure.
Fig. 5 signal amplification module circuit diagram.
Fig. 6 signal judge module circuit diagram.
Fig. 7 feedback control module circuit diagram.
Fig. 8 exports the amplification module circuit diagram.
Among the figure: storage battery 1, broad domain oxygen sensor 2, power module 3, heating module 4, signal amplification module 5, signal judge module 6, feedback control module 7, output amplification module 8, ECU 9, IC110, IC211, IC312, U1B 13, U1A 14, and U4B 15, and U4A 16, and U2A 17, and U2B 18, and U3B 19.
Embodiment
Below in conjunction with accompanying drawing the present invention is further introduced.
Lambda sensor used in the present invention is the broad domain oxygen sensor L1H1 of NTK, can be referred to as linear oxygen sensors again.Broad domain oxygen sensor can be exported a sensor feedback voltage Vs, and this Vs signal may be higher or lower than voltage signal V
RefVs＞V during dense waste gas
Ref, the feedback control circuit of rear end can produce unidirectional pump electric current I p, and the Ip of this direction can will make the oxygen free gas in the outlet pipe pump into reference chamber.Rare waste gas Vs＜V
Ref, the control circuit of its rear end produces rightabout pump electric current I p, and this pump electric current will make the oxygen free gas in the reference chamber be pumped out in the outlet pipe.Thereby make sensor feedback voltage Vs feedback signal get back to V
RefNeighbouring (450mV).Rely on the pump electric current to go to reach this balance, rely on the pump electric current to go to keep the concentration of oxygen in the reference chamber in other words conj.or perhaps, thereby make the size of pump electric current I p can reflect the size of oxygen concentration in the outlet pipe.The back end signal amplification circuit converts Ip to output voltage V out, and Vout is exactly the output of amplification circuit, and it has reflected the size of present engine air fuel ratio.
A kind of broad domain oxygen sensor controller of vehicular gaseous propellant engine is made up of heating module, power module and control module.
Control module connects into being connected between its each module by signal amplification module 5, signal judge module 6, feedback control module 7, output amplification module 8:
The also contact of first and second resistance R 1 in the signal amplification circuit 5, R2 and 15 capacitor C 15 is connected with the delivery outlet of the feedback voltage V s signal of broad domain oxygen sensor, sees Fig. 5 and Fig. 1.
38 resistance R 38 in the signal amplification circuit 5 and 22 capacitor C 22 and contact and signal judge module 6 in the in-phase input end of 16 operational amplifiers 16 and the inverting input of 15 operational amplifiers 15 be connected, see Fig. 5 and Fig. 6.
The output terminal of 13 operational amplifiers 13 in the signal amplification circuit 5 and 12 resistance R 12 and contact and feedback control module 7 in 13 resistance R 13 and the also contact of 14 resistance R 14 be connected, see Fig. 5 and Fig. 7.
The inverting input of 16 operational amplifiers, 16 output terminals in the signal judge module 6 and ten nine operational amplifiers 19 of output in the amplification module 8 and 25 resistance 25 and contact be connected, see Fig. 6 and Fig. 8.Signal judge module 6 is respectively feedback control module 7 regulation voltage signal Vju is provided, for output amplification module 8 provides control voltage signal V1.
In the feedback control module 7, the collector electrode of triode Q1 is connected with an end of 23 resistance R 23 of output in the amplification module 8; The output terminal of 18 operational amplifiers 18 in the feedback control module 7 is connected with the pump electric current I p+ mouth of broad domain oxygen sensor 2 through 21 resistance R 21, sees Fig. 7 and Fig. 8.Feedback control module 7 is respectively broad domain oxygen sensor 2 IP+ is provided signal, for output amplification module 8 provides control voltage signal V2.
In the output amplifier 8, the output terminal of 19 operational amplifiers 19 is connected with ECU through 39 resistance 39; Output amplification module 8 provides output voltage signal Vout for ECU 9, sees Fig. 1 and Fig. 8.
One, signal amplification module
The signal amplification module is used for the feedback signal Vs of lambda sensor is amplified, output VsAf1 and two amplifying signals of VsAf2.
The present invention needs repeatedly ratio to amplify, functions such as differential input computing, and these merits all need operational amplifier (Operational Amplifier).Consider that the designed control circuit of the present invention needs higher amplification precision, and the narrow and small the present invention in the space of entire circuit plate selected the dual track to track of AD (ANALOG DEVICES) far to calculate amplifier (Dual Rail-to-Rail Operational Amplifiers), and concrete model is OP295.Select this operational amplifier to consider that mainly its gain amplifier temperature influence is less, within whole operating temperature range, gain amplifier does not almost change, and vehicle electronics is needed just for this.
Use operational amplifier mainly to realize three kinds of functions in the present invention: oppositely to import scale operation, import scale operation in the same way, differential input arithmetic circuit.
Sensor feedback voltage Vs is amplified A
fTimes, this process just need be used homophase input ratio and far calculate.At this moment need to determine A
fValue, consider the factor of two aspects, the output of at first last controller along with the variation of excess air coefficient will be within the scope of 0～5V linear change, the intermediate value that its less important output value with λ=1 o'clock is put into scope is 2.5V just, and this requires just the intermediate value 0.45V of Vs is amplified to 2.5V.The factor of considering this two aspect is with A
fBe defined as 5.54, i.e. 0.45 * 5.54=2.5.
So the value of resistance is defined as R according to the homophase input ratio formula of far calculating
5=100k Ω, R
4=22k Ω.Be that magnification factor is:
Because Vs is low potential in air fuel ratio λ＞1, be sensor feedback voltage Vs high petential in the time of and λ＜1.Characterize λ＞1 in order to meet high petential, low potential characterizes the use convention of λ＜1 and is convenient to the rear end and uses, and the signal counter-rotating after institute will amplify sensor feedback voltage Vs by arithmetic circuit is amplified, and becomes to amplify output voltage V sAf2 and export.
Two, signal judge module
After the signal one-level is amplified, need signal is divided into two parts, just need to judge VsA
f=V
RefA
fWhether set up.
It should be noted that V
RefA
fBe the artificial value of setting, its value was exactly to have determined after just circuit board was carried out.But because signal fluctuation, the error that the measurement error of sensor itself and prime are amplified etc., VsA
fSize can near ideal value, be offset, therefore can not use VsA
f-V
RefA
f=0 judges whether λ is 1.
The present invention has adopted the method that changes Rule of judgment to solve this problem, and Rule of judgment is judged by judging whether equation is set up to become whether signal belongs within a certain scope.
Be about to original Rule of judgment:
VsA
f-V
refA
f＝0
Change into:
m
1V
refA
f＜VsA
f＜m
2V
refA
f
0＜m wherein
1＜1＜m
2＜0.9A
f
Because VsA
fOutput value is three discrete amounts, is exactly the situation of having represented λ=1 according to voltage intermediate quantity just.Like this, judge according to top inequality, even if VsA
fChange within the specific limits whether also can judge λ be 1.
The present invention has selected the quadruple mono signal comparator (Quad Single SupplyComparators) of motorola inc to be equipped with peripheral circuit again and has realized above-mentioned deterministic process.The concrete model that the present invention selects is LM2901D.
There are four independently comparators LM2901D inside.R among Fig. 6
45, R
46And R
43, R
44Constitute a dividing potential drop U respectively
12And U
34, can it be set to by the analysis of front:
U
12＝m
1V
refA
f，U
34＝m
2V
refA
f
0＜m wherein
1＜1＜m
2＜0.9A
f
Again according to the input-output characteristic of comparator:
In-phase end voltage u
+, end of oppisite phase voltage is u
-
u
+＞u
-, output V1=5V;
u
+＜u
-, output V1=-5V;
V1 changes judgement signal Vju into through further adjustment and amplification, and this signal will make the Q1 conducting or end, and its operation result is seen signal judge module logical operation table.Can draw by form and to have only VsA
fWhen belonging to intermediate value, the Q1 conducting, and Q1 just ends other two values the time.Its whole decision circuitry as shown in Figure 6.
Amplification output voltage signal VsAf1 and reference voltage after the signal judge module will amplify compare, be used to judge whether sensor feedback voltage Vs enters in the control range, judge promptly whether excess air coefficient is 1, it will export control voltage V1, export one simultaneously and judge signal Vju.
Signal judge module logical operation table
| U4A | U4B | LM2901D | Q1 | |
| m 1V refA f＞VsA f | -5 | 5 | 0 | End |
| m 1V refA f＜VsA f＜m 2V refA f | 5 | 5 | 5 | Conducting |
| m 2V refA f＜VsA f | 5 | -5 | 0 | End |
Three, feedback control module
The feedback control module circuit is seen Fig. 7, and it is made up of feedback control and conducting control triode Q1.When as can be seen from Figure 7 being equivalent to feedback resistance in the time of the Q1 conducting and being 0, no matter import what are, output all is 0.M ought appear like this
1V
RefA
f＜VsA
f＜m
2V
RefA
fSituation the time, feedback control just is in idle state, at this moment represents measured value λ=1.The output that amplify amplifier the rear end directly is changed to the magnitude of voltage of representing λ=1.Work as VsA
fIn the time of for other two kinds of situations, feedback control will be worked.Feedback control module realizes that by the hardware circuit based on operational amplifier operational amplifier adopts aforesaid OP295, and peripheral component then is common electric capacity and resistive element, and the Control Parameter of controller is determined by these electric capacity and resistance.
Feedback control module calculates control voltage V2 according to the size of Vju and amplification output voltage signal VsAf2 by computings such as infinitesimal calculus, and the difference of V1 and V2 will determine the size of pump electric current I p, thereby also reflect the size of current air fuel ratio.
Four, output amplification module
Output amplification module main body is a differential input discharge circuit, and main devices still is aforesaid OP295, as shown in Figure 8.
The output amplification module is used for V1 and V2 are carried out differential amplification, converts thereof into the voltage signal of 0～5V.
Five, heating module
The supply voltage of the electronics that automobile offers generally all is 12V or 24V, and this voltage can have variation by a relatively large margin with engine running situation and battery condition.But in order to make lambda sensor energy stable operation, the broad domain oxygen sensor L1H1 of NTK needs a stable 10.5V operating voltage, mainly is to be used for heating to the element of generation electrochemical reactions such as pump battery.This just needs heating power supply module of design.
Consider that working environment that the vibrations of high temperature on the motor are bigger and input and output voltage are than factors such as (output are less than input), the present invention has selected the LM2576-ADJ element of National Semiconductor Corporation (National Semiconductor) as stabilized power supply, and its normal operation circumstances temperature range is-40 ℃≤T
j≤ 125 ℃, satisfy automobile-used scope fully.The used function Placement of the present invention as shown in Figure 3.Wherein Vin meets battery tension 12V or 24V,
LM2576-ADJ is a kind of regulated power supply, and adjustment range is being 1.23V～V
In, it is specifically exported formula and is
R
48, R
47Be regulating resistor, select R herein
48=1k Ω, R
47=7.87k Ω can be got V by following formula
Out≈ 10.5V.Because the voltage feed back controlling unit is arranged, this output voltage is constant, does not change with input voltage and external environment, thereby can make the broad domain oxygen sensor can stable operation.
Heating module will change into broad domain oxygen sensor required burning voltage Heater+ of when work from the supply voltage Vbat of storage battery, and the element that is mainly used in to generation electrochemical reactions such as pump batteries heats, and make it can normal and stable operation.
Six, power module
The CAP+ mouth of chip IC 312LT1054 connects seven capacitor C 7 (47uF) and connects the CAP-mouth, the GND mouth of chip IC 312 meets GND, the VCC mouth of chip IC 3 connects+5V, the Vout mouth of chip IC 3L connects-5V, the 8th capacitor C 8 (54.2uF) one termination+5V, one termination GDN, the 9th capacitor C 9 (47uF) one termination-5V, a termination GDN.
Power module with battery tension change into circuit required+5V ,-working powers such as 5V, these power supplys are used for powering to devices such as operational amplifier, comparators.
Consider that the input power supply is 12V, and the narrow and small and more high factor of ambient temperature in space on the vehicle, the present invention selects the power supply of the MC78M05C of motorola inc as 12V commentaries on classics 5V, uses the power supply of LT1054 conduct+5V commentaries on classics-5V of Linear Technology.
The operating temperature range of MC78M05C is-40 ℃≤T
j≤ 125 ℃, and its volume is less, satisfies automobile-used requirement fully.Pin one is an input end, connects 12V voltage; Pin 3 connects output terminal, output 5V power supply, i.e. output voltage V
Out=5V; The element back side is pin two, ground connection.
The operating temperature range of LT1054 is-55 ℃≤T
j≤ 125 ℃, because the 5V power supply has been arranged now, directly utilize the reverse function of LT1054 just can obtain-the 5V power supply.
V
out＝-V
in＝-5V
Amplification control flow of the present invention is as follows:
1. accept sensor feedback voltage Vs signal and since signal a little less than, with it according to A
f(its size illustrates in the back) doubly amplifies.
2. by the analysis of front, the VsAf as a result of previous step can only be three kinds of situations, promptly 0, and 0.45Af, 0.9Af wherein if amplifying the back is 0.45Af, then represents current λ=1, other two kinds of situations are λ ≠ 1.Now whether equaling 1 according to λ divides two-part to handle the signal.
3. because the back need produce the pump electric current I p of different direction at the voltage signal of the both sides of λ=1 different direction, so the signal after the sensor feedback voltage Vs amplification is deducted the A of λ=1 o'clock Vs value
fDoubly, i.e. VsA
f-V
RefA
fLike this, when λ changes near around 1, VsA
f-V
RefA
fChange around 0, the electric current of its generation also has both direction, i.e. λ＞1 o'clock, and direction of pump electric current I p, λ＜1 o'clock Ip is another direction.
4. the signal counter-rotating after Vs being amplified becomes VsAf2 output.
5. when λ ≠ 1, will receive the input end of feedback control module through the voltage signal VsAf2 of previous processed, feedback control circuit is realized by an operational amplifier and peripheral components.This controller calculates the size of required control voltage according to the given operation rule of hardware, this voltage is failed back given lambda sensor, thereby change the size of pump electric current, keeps the stable of oxygen concentration in the reference chamber.
6. when λ ≈ 1, sensor feedback voltage Vs exports the voltage signal of a 450mV.At this moment regulating voltage Vju will make the Q1 conducting, thereby with the feedback control module short circuit, it be quit work, and at this moment backend amplifier will directly amplify control voltage V1.
7. foregoing three kinds of resulting voltage signals of situation are further transformed amplification, make its range at 0～5V, amplification circuit is seen Fig. 8.
So far, the variation of excess air coefficient in relative broad range can be fully characterized by the height of the output voltage of amplification controller.
Claims (1)
1. the broad domain oxygen sensor controller of a vehicular gaseous propellant engine comprises heating module, power module and control module; It is characterized in that: control module is formed by connecting by signal amplification module (5), signal judge module (6), feedback control module (7), output amplification module (8);
Signal amplification module (5) is made up of 13 operational amplifiers (13) and ten four-operational amplifiers (14) and peripheral circuit; The in-phase input end that is connected to 13 operational amplifiers (13) therebetween is connected to the output terminal of the tenth four-operational amplifier (14) by the 9th resistance (R9); The signal of output voltage V sAf2 is amplified in the output terminal output of 13 operational amplifiers (13); The output terminal of 13 operational amplifiers (13) connects the inverting input of 13 operational amplifiers (13) by 12 resistance (R12); The 7th resistance (R7) is connected with the 8th resistance (R8), another termination+5V of the 7th resistance (R7), another termination of the 8th resistance (R8) GND; The dividing point of 11 resistance (R11) termination the 7th resistance (R7) and the 8th resistance (R8), the inverting input of another termination 13 operational amplifiers (13) of 11 resistance (R11); Lambda sensor feedback voltage V s signal meets the also contact of first resistance (R1), second resistance (R2) and 15 electric capacity (C15), another termination+5V of first resistance (R1), another termination of 15 electric capacity (C15) GND; The in-phase input end of another termination ten four-operational amplifiers (14) of second resistance (R2); The anode of diode D2 connects+5V, and the negative electrode of diode D2 connects the in-phase input end of ten four-operational amplifiers (14); Diode D3 is in parallel with first electric capacity (C1), the in-phase input end of a termination ten four-operational amplifiers (14) of diode D3, another termination GND of diode D3; The inverting input of ten four-operational amplifiers (14) is through the 3rd resistance (R3) and the 4th resistance (R4) series connection GND; The dividing point of the 5th resistance (R5) termination the 3rd resistance (R3) and the 4th resistance (R4), the output terminal of another termination ten four-operational amplifiers (14); The output terminal of ten four-operational amplifiers (14) amplifies output voltage V sAf1 by the circuit output that 38 resistance (R38), ten resistance (R10), 22 electric capacity (C22) are formed;
Signal judge module (6) is made up of 15,16 and 17 operational amplifiers (15,16,17) and peripheral circuit; The in-phase input end of 15 operational amplifiers (15) connects+5V by 43 resistance (R43), and the in-phase input end of 15 operational amplifiers (15) meets GND by 44 resistance (R44); Amplify output voltage V sAf1 and connect the inverting input of 15 operational amplifiers (15) and the in-phase input end of 16 operational amplifiers (16); The inverting input of 16 operational amplifiers (16) connects+5V by 45 resistance (R45), and the inverting input of 16 operational amplifiers (16) meets GND by 46 resistance (R46); The output terminal of the output terminal of 15 operational amplifiers (15) and 16 operational amplifiers (16) joins and exports control voltage V1; The output terminal of 15 operational amplifiers (15) is connected and is connect the in-phase input end of 17 operational amplifiers (17) behind 24 resistance and 49 resistance (R24, R49); The inverting input of 17 operational amplifiers (17) connects+5V by 18 resistance (R18), and the inverting input of 17 operational amplifiers (17) meets GND by 19 resistance (R19); The parallel circuit output regulating voltage Vju that output termination 17 resistance (R17) of 17 operational amplifiers (17), the 6th electric capacity (C6) are formed;
Feedback control module (7) is made up of 18 operational amplifiers (18) and peripheral circuit; Regulating voltage Vju connects the base stage of triode (Q1), and the emitter of triode (Q1) connects the inverting input of 18 operational amplifiers (18); Amplify output voltage V sAf2 connects 18 operational amplifiers (18) by the hybrid circuit of 13 resistance (R13), second electric capacity (C2) and 14 resistance (R14) composition inverting input; The in-phase input end string of 18 operational amplifiers (18) meets GND through 16 resistance (R16); The 3rd electric capacity (C3) is connected with the parallel circuit and the 4th of 15 resistance (R15) composition, the parallel circuit that the 5th electric capacity (C4, C5) is formed, and forms first series circuit; The emitter of one termination triode (Q1) of first series circuit, the collector electrode of another termination triode (Q1) of first series circuit and output control voltage V2; The collector electrode of triode (Q1) connects the output terminal of 18 operational amplifiers (18), the collector electrode of triode (Q1) 21 resistance (R21) the rear pump electric current I p+ that connects;
Output amplification module (8) is made up of 19 operational amplifiers (19) and peripheral circuit; Control voltage V1 connects the inverting input of 19 operational amplifiers (19), and control voltage V2 connects the in-phase input end of 19 operational amplifiers (19) by 22 resistance (R22); The in-phase input end of 19 operational amplifiers (19) connects+5V after being connected in series 23 resistance (R23), 26 resistance (R26), one termination, 23 resistance (R23) of 27 resistance (R27), the dividing point of 26 resistance (R26), another termination GND of 27 resistance (R27); The output terminal of 19 operational amplifiers (19) connects the inverting input of 19 operational amplifiers (19) by 25 resistance (R25), and the output terminal of 19 operational amplifiers (19) is by 39 resistance (R39) output output voltage V out;
Being connected between the each several part of formation broad domain oxygen sensor controller:
The also contact of first and second resistance in the signal amplification module (5) (R1, R2) and 15 electric capacity (C15) is connected with the delivery outlet of the lambda sensor feedback voltage V s signal of broad domain oxygen sensor (2);
38 resistance (R38) in the signal amplification module (5) and 22 electric capacity (C22) and contact and signal judge module (6) in the in-phase input end of 16 operational amplifiers (16) and the inverting input of 15 operational amplifiers (15) be connected;
The output terminal of 13 operational amplifiers (13) in the signal amplification module (5) and the 12 resistance (R12) and contact and feedback control module (7) in 13 resistance (R13) and the also contact of 14 resistance (R14) be connected;
The inverting input of 19 operational amplifiers (19) in 16 operational amplifiers (16) output terminal in the signal judge module (6) and output amplification module (8) and 25 resistance (25) and contact be connected;
In the feedback control module (7), an end of 22 resistance (R22) in the collector electrode of triode (Q1) and output amplification module (8) is connected; The output terminal of 18 operational amplifiers (18) in the feedback control module (7) is connected with the pump electric current I p+ mouth of broad domain oxygen sensor (2) through 21 resistance (R21);
In the output amplification module (8), the output terminal of 19 operational amplifiers (19) is connected with electronic control unit through 39 resistance (39).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101046986A CN101260838B (en) | 2008-04-23 | 2008-04-23 | Broad domain oxygen sensor controller of vehicular gaseous propellant engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101046986A CN101260838B (en) | 2008-04-23 | 2008-04-23 | Broad domain oxygen sensor controller of vehicular gaseous propellant engine |
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| Publication Number | Publication Date |
|---|---|
| CN101260838A CN101260838A (en) | 2008-09-10 |
| CN101260838B true CN101260838B (en) | 2010-06-09 |
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| CN102022204A (en) * | 2010-05-18 | 2011-04-20 | 华南农业大学 | CAN bus based air-fuel ratio analyzing device for vehicle cylinder and analyzing method thereof |
| CN103529096B (en) * | 2013-10-31 | 2015-08-26 | 中国兵器工业集团第二一四研究所苏州研发中心 | Partial pressure of oxygen sensor signal processing circuit |
| CN103994849B (en) * | 2014-05-22 | 2017-01-04 | 北方工业大学 | A kind of development of high sensitivity small light electric-type force transducer |
| CN105242571B (en) * | 2015-10-21 | 2018-03-09 | 华中科技大学 | A kind of broad domain oxygen sensor controller analogue system |
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| US4932238A (en) * | 1987-09-25 | 1990-06-12 | Ngk Spark Plug Co., Ltd. | Control system and method for controlling plant having high order lag |
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| CN2507013Y (en) * | 2000-03-21 | 2002-08-21 | 深圳市聖峰电子有限公司 | Ozone concentration autoamtic controlled detector |
| CN2527098Y (en) * | 2002-01-15 | 2002-12-25 | 姬广闻 | Fully automatic intelligent aerator controller |
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