CN102454496B - A kind of common interface circuit for lambda sensor - Google Patents
A kind of common interface circuit for lambda sensor Download PDFInfo
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- CN102454496B CN102454496B CN201010523991.3A CN201010523991A CN102454496B CN 102454496 B CN102454496 B CN 102454496B CN 201010523991 A CN201010523991 A CN 201010523991A CN 102454496 B CN102454496 B CN 102454496B
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- resistance
- interface circuit
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- lambda sensor
- triode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The present invention relates to a kind of common interface circuit for lambda sensor, be arranged between lambda sensor and engine electronic control unit, described common interface circuit comprises filtering subcircuit, signal amplifies subcircuit, sensor model number coupling subcircuit, interface circuit controller, and described interface circuit controller comprises power module, sensor model number matching module.Compared with prior art, the present invention has the dissimilar lambda sensor that can mate different lambda sensor MANUFACTURER and produce, making it circuit does not need other adjunct circuits can meet different Engine ECU demand, thus any advantage such as to mate realizing the Engine ECU of dissimilar lambda sensor and different automobile types.
Description
Technical field
The present invention relates to a kind of common interface circuit, especially relate to a kind of common interface circuit for lambda sensor.
Background technique
At use triple mode catalytic converter to reduce on the motor of exhaust pollution, lambda sensor is absolutely necessary element.Because the air fuel ratio of fuel mixture is once deviation theory air fuel ratio, three-way catalyst will sharply decline to the purifying ability of carbon monoxide, hydrocarbon, oxynitrides, therefore in outlet pipe, lambda sensor is installed, in order to detect the concentration of oxygen in exhaust, and send feedback signal to engine electric-controlled unit, the increase and decrease of oil sprayer fuel injection quantity is controlled again by engine electric-controlled unit, thus by the air-fuel ration control of fuel mixture near theoretical value.
Lambda sensor needs motor exhaust and reference air to carry out good isolation, and actual conditions are the restrictions due to isolated material, technique and Environmental Conditions, motor exhaust always has and is leaked on a small quantity in reference air, thus changes the partial pressure of oxygen of reference air; Meanwhile, in lambda sensor work, also constantly can consume the oxygen in reference air, reduce the partial pressure of oxygen of reference air.And the partial pressure of oxygen of lambda sensor reference air is once change, lambda sensor will be made to output signal distortion, cause lambda sensor to lose efficacy.
Occupy above reason, this just makes different lambda sensor MANUFACTURER in lambda sensor design, have employed various different encapsulation and compensation mechanism, wherein the most frequently used have adopt ventilated membrane can respiration type lambda sensor, adopt the storage oxygen formula lambda sensor of rear end sleeve pipe storage oxygen, adopt the current pump oxygen formula lambda sensor that current pump oxygen compensates, and the voltage pump oxygen formula lambda sensor adopting voltage pump oxygen etc. type.
The lambda sensor of the model that the engine electronic control unit (Engine ECU) of current different automobile has oneself to mate, is difficult to coupling between dissimilar lambda sensor, and the lambda sensor of different manufacturers is also difficult to coupling.This just causes the lambda sensor of numerous model, brings inconvenience to automobile later maintenance and maintenance.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of can mate different lambda sensor MANUFACTURER produce dissimilar lambda sensor, making it circuit does not need other adjunct circuits can meet different Engine ECU demand, thus realizes any common interface circuit for lambda sensor mated of dissimilar lambda sensor and the Engine ECU of different automobile types.
Object of the present invention can be achieved through the following technical solutions: a kind of common interface circuit for lambda sensor, be arranged between lambda sensor and engine electronic control unit, it is characterized in that, described common interface circuit comprises filtering subcircuit, signal amplifies subcircuit, sensor model number coupling subcircuit, interface circuit controller, described interface circuit controller comprises power module, sensor model number matching module, described lambda sensor, filtering subcircuit, signal amplifies subcircuit, engine electronic control unit connects successively, one end of described sensor model number coupling subcircuit is connected between lambda sensor and filtering subcircuit, the other end of described sensor model number coupling subcircuit is connected with interface circuit controller, described interface circuit controller respectively with lambda sensor, engine electronic control unit, signal amplifies subcircuit and connects.
Described common interface circuit also comprises temperature and controls subcircuit, one end that this temperature controls subcircuit is connected with lambda sensor, the other end that described temperature controls subcircuit is connected with interface circuit controller, and described interface circuit controller also comprises temperature control modules.
Described interface circuit controller also comprises fault diagnosis module.
Described filtering subcircuit comprises the 3rd resistance, electric capacity, and one end of the 3rd described resistance is connected with lambda sensor, and the other end is connected with one end of electric capacity, the other end ground connection of described electric capacity.
Described signal amplifies subcircuit and comprises the 5th resistance, 6th resistance, 8th resistance, first operational amplifier, one end of the 5th described resistance and the 3rd resistance, connect between electric capacity, the other end of the 5th described resistance is connected with the positive input terminal of the first operational amplifier, one end ground connection of the 6th described resistance, the described the other end of the 6th resistance is connected with the anti-input end of the first operational amplifier, one end of the 8th described resistance and the 6th resistance, connect between the anti-input end of the first operational amplifier, the other end of the 8th described resistance is connected with the output terminal of the first operational amplifier, the output terminal of the first described operational amplifier is connected with engine electronic control unit.
Described sensor model number coupling subcircuit comprises the first resistance, second resistance, 4th resistance, 7th resistance, 9th resistance, one MOS switching tube, 2nd MOS switching tube, second operational amplifier, first triode, second triode, 3rd triode, one end of the first described resistance is connected with lambda sensor, the other end of the first described resistance is connected with the drain electrode of the 2nd MOS switching tube, the grid of the 2nd described MOS switching tube is connected with interface circuit controller, the source electrode of the 2nd described MOS switching tube is connected with the output terminal of the second operational amplifier, the anti-input end of the second described operational amplifier is connected with the output terminal of the second operational amplifier, the positive input terminal of the second described operational amplifier is connected with one end of the 4th resistance, the other end ground connection of the 4th described resistance, described one end of the 9th resistance and the positive input terminal of the second operational amplifier, connect between 4th resistance, one end of the second described resistance is connected with lambda sensor, the other end of the second described resistance is connected with the drain electrode of a MOS switching tube, the grid of a described MOS switching tube is connected with interface circuit controller, the source electrode of a described MOS switching tube is connected with the collector electrode of the first triode, the base stage of the first described triode is connected with one end of the 7th resistance, the other end ground connection of the 7th described resistance, the transmitter of the first described triode is connected with the collector electrode of the second triode, the base stage of the second described triode is connected with the base stage of the 3rd triode, the collector electrode of the second described triode is connected with the base stage of the second triode, the emitter of the second described triode is connected with the emitter of the 3rd triode, the emitter of the second described triode respectively with the other end of the 9th resistance, interface circuit controller connects, the collector electrode of the 3rd described triode is connected with the base stage of the first triode.
Described temperature controls subcircuit and comprises the 3rd MOS switching tube, current sensor, the source electrode of the switching tube of the 3rd described MOS is connected with lambda sensor, the grid of the 3rd described MOS is connected with interface circuit controller, the drain electrode of the 3rd described MOS is connected with one end of current sensor, the other end of described current sensor is connected with the heater of lambda sensor, and described interface circuit controller is connected with the drain electrode of the 3rd MOS.
Compared with prior art, the present invention has the dissimilar lambda sensor that can mate different lambda sensor MANUFACTURER and produce, making it circuit does not need other adjunct circuits can meet different Engine ECU demand, thus realizes any advantage of mating of dissimilar lambda sensor and the Engine ECU of different automobile types.
Accompanying drawing explanation
Fig. 1 is the electrical schematics of the present invention in engine system;
Fig. 2 is theory diagram of the present invention;
Fig. 3 is the flow chart of fault diagnosis module;
Fig. 4 is circuit diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of common interface circuit 4 for lambda sensor, is arranged between lambda sensor 5 and engine electronic control unit 2, and lambda sensor 5 is arranged on ternary catalyzing unit 3, and ternary catalyzing unit 3 is arranged on motor 1.As shown in Figure 2, Figure 4 shows, common interface circuit comprises filtering subcircuit 41, signal amplifies subcircuit 42, sensor model number coupling subcircuit 43, temperature control subcircuit, interface circuit controller 44.Interface circuit controller 44 comprises power module 431, sensor model number matching module 432, fault diagnosis module 433, temperature control modules 434.Lambda sensor 5, filtering subcircuit 41, signal amplify subcircuit 42, engine electronic control unit 2 connects successively.One end of sensor model number coupling subcircuit 43 is connected between lambda sensor 5 and filtering subcircuit 41.The other end of sensor model number coupling subcircuit 43 is connected with interface circuit controller 44.Interface circuit controller 44 amplifies subcircuit 42 with lambda sensor 5, engine electronic control unit 2, signal respectively and is connected.One end that temperature controls subcircuit is connected with lambda sensor 5.The other end that temperature controls subcircuit is connected with interface circuit controller 44.
As shown in Figure 4, filtering subcircuit 41 comprises the 3rd resistance 73, electric capacity 82.One end of 3rd resistance 73 is connected with lambda sensor 5, and the other end is connected with one end of electric capacity 82.The other end ground connection of electric capacity 82.Signal amplifies subcircuit 42 and comprises the 5th resistance 75, the 6th resistance 76, the 8th resistance 79, first operational amplifier 77.One end of 5th resistance 75 is connected with between the 3rd resistance 73, electric capacity 82.The other end of the 5th resistance 75 is connected with the positive input terminal of the first operational amplifier 77.One end ground connection of the 6th resistance 76.The other end of the 6th resistance 76 is connected with the anti-input end of the first operational amplifier 77.One end of 8th resistance 79 is connected with between the anti-input end of the 6th resistance 76, first operational amplifier 77.The other end of the 8th resistance 79 is connected with the output terminal of the first operational amplifier 77.The output terminal of the first operational amplifier 77 is connected with engine electronic control unit 44.Sensor model number coupling subcircuit 43 comprises the first resistance 71, second resistance 72, the 4th resistance 74, the 7th resistance 78, the 9th resistance 80, a MOS switching tube 83, the 2nd MOS switching tube 84, second operational amplifier 90, first triode 86a, the second triode 86b, the 3rd triode 86c.One end of first resistance 71 is connected with lambda sensor 5.The other end of the first resistance 71 is connected with the drain electrode of the 2nd MOS switching tube 84.The grid of the 2nd MOS switching tube 84 is connected with interface circuit controller 43.The source electrode of the 2nd MOS switching tube 84 is connected with the output terminal of the second operational amplifier 90.The anti-input end of the second operational amplifier 90 is connected with the output terminal of the second operational amplifier 90.The positive input terminal of the second operational amplifier 90 is connected with one end of the 4th resistance 74.The other end ground connection of the 4th resistance 74.One end of 9th resistance 80 is connected with between the positive input terminal of the second operational amplifier 90, the 4th resistance 74.One end of second resistance 72 is connected with lambda sensor 5.The other end of the second resistance 72 is connected with the drain electrode of a MOS switching tube 83.The grid of the one MOS switching tube 83 is connected with interface circuit controller 43.The source electrode of the one MOS switching tube 83 is connected with the collector electrode of the first triode 86a.The base stage of the first triode 86a is connected with one end of the 7th resistance 78.The other end ground connection of the 7th resistance 78.The transmitter of the first triode 86a is connected with the collector electrode of the second triode 86b.The base stage of the second triode 86b is connected with the base stage of the 3rd triode 86c.The collector electrode of the second triode 86b is connected with the base stage of the second triode 86b.The emitter of the second triode 86b is connected with the emitter of the 3rd triode 86c.The emitter of the second triode 86b is connected with the other end of the 9th resistance 80, interface circuit controller 43 respectively.The collector electrode of the 3rd triode 86c is connected with the base stage of the first triode 86a.Temperature controls subcircuit 2 and comprises the 3rd MOS switching tube 85, current sensor 81.The source electrode of the 3rd MOS switching tube 85 is connected with lambda sensor 5.The grid of the 3rd MOS switching tube 85 is connected with interface circuit controller 43.The drain electrode of the 3rd MOS switching tube 85 is connected with one end of current sensor 81.The other end of current sensor 81 is connected with the heater of lambda sensor 5.Interface circuit controller 43 is connected with the drain electrode of the 3rd MOS switching tube 85.
Lambda sensor common interface circuit 4 has 3 selector switches, selects 3 kinds of dissimilar lambda sensor mode of operations respectively, comprises storage oxygen formula lambda sensor working method, current pump oxygen working method, voltage pump oxygen working method.Lambda sensor common interface circuit realizes communicating with ECU by SPI mouth, comprises trouble signal transmission, the instruction of lambda sensor relevant control.Current module is DC/DC modular converter, mainly by the voltage of motor car engine Power convert needed for common interface circuit.Sensor model number coupling subcircuit, comprise and be provided for the current source of current pump oxygen working method and the reference voltage for voltage pump oxygen working method, wherein the pump oxygen Current Control of current source is at 8-12 microampere, and reference voltage is 0.45V.Fault diagnosis module comprises cold start-up open fault, cold start-up short trouble, thermal starting open fault, thermal starting short trouble, sensor failure fault.Temperature control modules comprises the current collection circuit of oxygen sensor heater.
Be the control flow chart of fault diagnosis circuit shown in Fig. 3, first read the electric current of heater by the current sensor 81 of heater, if be less than value Δ 1, think that heater work is abnormal, sensor heater fault is set; If be greater than Δ 1, then estimate whether the temperature of sensor is greater than 200 degrees Celsius to judge engine behavior (cold start-up and thermal starting).
When cold start-up, close the second metal-oxide-semiconductor 84, load reference voltage 0.45V, if output voltage Vout is between 0.45+ Δ 2 and 0.45-Δ 2, lambda sensor normal operation is described.Otherwise, more whether be less than 0.45-Δ 2 according to output voltage Vout and can judge short circuit sensor fault or open fault.
When thermal starting, if output voltage Vout is between 0.1 and 1, at record output voltage Vout in 10s, is greater than 0.6V and the number of times being less than 0.3V, is greater than 8 times and lambda sensor normal operations are described.Otherwise, sensor response fault is set; If export and be greater than 1, output transducer short trouble; If when being less than 0.1 volt, by the second metal-oxide-semiconductor 84 conducting, when now output voltage Vout is still less than 0.1V, open sensor fault is set.When output voltage Vout is greater than 0.1V, sensor failure fault is set.
It is one of a kind of common interface circuit specific embodiment for lambda sensor of the present invention shown in Fig. 4.
Wherein, described eliminator 41 forms RC low-pass filter circuit by the 3rd resistance 73 and electric capacity 82, carries out filtering to lambda sensor output signal.Amplification circuit 42 is made up of the 5th resistance 75, the 5th resistance 76, the 8th resistance 79 and the first operational amplifier 77, and the resistance of adjustment the 5th resistance 76, the 8th resistance 79 makes the power gain of amplification circuit 42 be 5.The power module 431 of interface circuit controller (ICC) 43, by car accumulator power supply 12V, is transformed to 5V through DC/DC.Sensor model number coupling subcircuit comprises the first resistance 71, second resistance 72, the 4th resistance 74, the 7th resistance 78, the 9th resistance 80, a MOS switching tube 83, the 2nd MOS switching tube 84, second operational amplifier 84, first triode 86a, the second triode 86b, the 3rd triode 86c.Wherein, the first triode 86a, the second triode 86b, the 3rd triode 86c, the 7th resistance 78 form Wilson's current source, and+the 5V that the input end of this current source is connected to ICC by wire exports; The bleeder circuit that reference voltage is made up of the 7th resistance 78, the 9th resistance 80 provides, + the 5V that bleeder circuit is wired to ICC exports, regulate the 7th resistance 78, the 9th resistance 80 of bleeder circuit, what make the second operational amplifier 84 is input as 0.45V, and the second operational amplifier 84 self forms voltage follower simultaneously.
When storing up oxygen formula lambda sensor working method, the first metal-oxide-semiconductor 83, second metal-oxide-semiconductor 84 disconnects; When current pump oxygen working method, the first metal-oxide-semiconductor 83 conducting, the second metal-oxide-semiconductor 84 disconnect, and are now provided the pump oxygen electric current of 10 microamperes by current source; When in voltage pump oxygen working method, the first metal-oxide-semiconductor 83 disconnects, the second metal-oxide-semiconductor 84 conducting, now provides 0.45V pump oxygen voltage by bleeder circuit.Temperature control modules 434, estimates the temperature of the heater of lambda sensor by current sensor 81, realized the temperature control of lambda sensor 5 by the break-make of the 3rd metal-oxide-semiconductor 85 simultaneously.The function of fault diagnosis module 433 comprises sensor failure fault, short circuit sensor fault, open sensor fault, sensor response fault, sensor heater fault.
Claims (5)
1. the common interface circuit for lambda sensor, be arranged between lambda sensor and engine electronic control unit, it is characterized in that, described common interface circuit comprises filtering subcircuit, signal amplifies subcircuit, sensor model number coupling subcircuit, interface circuit controller, described interface circuit controller comprises power module, sensor model number matching module, described lambda sensor, filtering subcircuit, signal amplifies subcircuit, engine electronic control unit connects successively, one end of described sensor model number coupling subcircuit is connected between lambda sensor and filtering subcircuit, the other end of described sensor model number coupling subcircuit is connected with interface circuit controller, described interface circuit controller respectively with lambda sensor, engine electronic control unit, signal amplifies subcircuit and connects.
2. a kind of common interface circuit for lambda sensor according to claim 1, it is characterized in that, described common interface circuit also comprises temperature and controls subcircuit, one end that this temperature controls subcircuit is connected with lambda sensor, the other end that described temperature controls subcircuit is connected with interface circuit controller, and described interface circuit controller also comprises temperature control modules.
3. a kind of common interface circuit for lambda sensor according to claim 2, is characterized in that, described interface circuit controller also comprises fault diagnosis module.
4. a kind of common interface circuit for lambda sensor according to claim 2, it is characterized in that, described filtering subcircuit comprises the 3rd resistance, electric capacity, one end of the 3rd described resistance is connected with lambda sensor, the other end is connected with one end of electric capacity, the other end ground connection of described electric capacity;
Described signal amplifies subcircuit and comprises the 5th resistance, 6th resistance, 8th resistance, first operational amplifier, one end of the 5th described resistance and the 3rd resistance, connect between electric capacity, the other end of the 5th described resistance is connected with the positive input terminal of the first operational amplifier, one end ground connection of the 6th described resistance, the described the other end of the 6th resistance is connected with the anti-input end of the first operational amplifier, one end of the 8th described resistance and the 6th resistance, connect between the anti-input end of the first operational amplifier, the other end of the 8th described resistance is connected with the output terminal of the first operational amplifier, the output terminal of the first described operational amplifier is connected with engine electronic control unit,
Described sensor model number coupling subcircuit comprises the first resistance, second resistance, 4th resistance, 7th resistance, 9th resistance, one MOS switching tube, 2nd MOS switching tube, second operational amplifier, first triode, second triode, 3rd triode, one end of the first described resistance is connected with lambda sensor, the other end of the first described resistance is connected with the drain electrode of the 2nd MOS switching tube, the grid of the 2nd described MOS switching tube is connected with interface circuit controller, the source electrode of the 2nd described MOS switching tube is connected with the output terminal of the second operational amplifier, the anti-input end of the second described operational amplifier is connected with the output terminal of the second operational amplifier, the positive input terminal of the second described operational amplifier is connected with one end of the 4th resistance, the other end ground connection of the 4th described resistance, described one end of the 9th resistance and the positive input terminal of the second operational amplifier, connect between 4th resistance, one end of the second described resistance is connected with lambda sensor, the other end of the second described resistance is connected with the drain electrode of a MOS switching tube, the grid of a described MOS switching tube is connected with interface circuit controller, the source electrode of a described MOS switching tube is connected with the collector electrode of the first triode, the base stage of the first described triode is connected with one end of the 7th resistance, the other end ground connection of the 7th described resistance, the transmitter of the first described triode is connected with the collector electrode of the second triode, the base stage of the second described triode is connected with the base stage of the 3rd triode, the collector electrode of the second described triode is connected with the base stage of the second triode, the emitter of the second described triode is connected with the emitter of the 3rd triode, the emitter of the second described triode respectively with the other end of the 9th resistance, interface circuit controller connects, the collector electrode of the 3rd described triode is connected with the base stage of the first triode.
5. a kind of common interface circuit for lambda sensor according to claim 4, it is characterized in that, described temperature controls subcircuit and comprises the 3rd MOS switching tube, current sensor, the source electrode of the switching tube of the 3rd described MOS is connected with lambda sensor, the grid of the 3rd described MOS is connected with interface circuit controller, the drain electrode of the 3rd described MOS is connected with one end of current sensor, the other end of described current sensor is connected with the heater of lambda sensor, and described interface circuit controller is connected with the drain electrode of the 3rd MOS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010523991.3A CN102454496B (en) | 2010-10-28 | 2010-10-28 | A kind of common interface circuit for lambda sensor |
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| CN201010523991.3A CN102454496B (en) | 2010-10-28 | 2010-10-28 | A kind of common interface circuit for lambda sensor |
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| CN102454496A CN102454496A (en) | 2012-05-16 |
| CN102454496B true CN102454496B (en) | 2016-01-13 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103777561B (en) * | 2012-10-24 | 2016-12-07 | 联创汽车电子有限公司 | Oxygen sensor heating control circuit |
| CN106765925A (en) * | 2016-12-09 | 2017-05-31 | 宋显峰 | Air monitoring system |
| CN109187672B (en) * | 2018-10-23 | 2022-03-15 | 成都安可信电子股份有限公司 | Electrochemical sensor testing system and testing method |
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