CN200962097Y - Wide-area oxygen sensor signal processing device - Google Patents
Wide-area oxygen sensor signal processing device Download PDFInfo
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- CN200962097Y CN200962097Y CN 200620099469 CN200620099469U CN200962097Y CN 200962097 Y CN200962097 Y CN 200962097Y CN 200620099469 CN200620099469 CN 200620099469 CN 200620099469 U CN200620099469 U CN 200620099469U CN 200962097 Y CN200962097 Y CN 200962097Y
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Abstract
The utility model provides a wide region oxygen sensor signal processing apparatus is equipped with the signal level processing converting circuit who includes signal level biasing circuit, amplifier circuit and feedback circuit in proper order including giving oxygen sensor heating voltage processing circuit, pump current control and signal detection circuit behind pump current control and signal detection circuit, and output signal is 0-1V's voltage signal. The sensor heating power supply circuit takes the input voltage of a vehicle battery as a power supply, the circuit comprises an adjustable switch type voltage regulator (U3), the output of a capacitor (C11) and a protective diode (D2) of a U3 is used for providing heating voltage for the oxygen sensor, and the output voltage is fed back to the U3 by a resistor (R13) after being subjected to voltage division by a resistor (R11) and a resistor (R12). The utility model discloses directly corresponding the air-fuel ratio of engine, its characteristic curve is analogized in jump type oxygen sensor, and the inside hardware circuit of ECU, internal variable and control logic need not change, can realize the lean burn closed loop control of system.
Description
Technical field
The utility model relates to a kind of broad domain oxygen sensor signal processing apparatus, belongs to ignition internal combustion engine sensor signal technical finesse field.
Background technology
At present spark-ignition engine mainly contains natural aspiration, chemically correct fuel control burning and two kinds of technology paths of Pressure charging thin combustion, characteristics such as it is big wherein to adopt the mode of Pressure charging thin combustion to have a moment of torsion, and fuel consumption is low, and emission behavior is good.Adopt the lambda sensor of saltus step performance in the control system of natural aspiration gas engine, whether the air-fuel ratio that detects exhaust is near theoretical air-fuel ratio; And the air-fuel ratio the during engine operation of Pressure charging thin combustion is very rare, need use broad domain oxygen sensor during closed-loop control, the variation of detection of engine air-fuel ratio in the scope of broad.Transform as at some traditional gasoline engine electric-control systems and by it in electric-control system of combustion gas control, because the signal type of engine electric-controlled unit (ECU) acquiescence is the characteristics of signals of the lambda sensor of saltus step type performance, the signal of broad domain oxygen sensor must be through just meeting the demands after the conditioning.
Summary of the invention
The utility model just is being based on traditional gasoline engine electric-control system and by its electric-control system that transform combustion gas control as, for satisfying the requirement of ECU (Electrical Control Unit) (ECU), is providing a kind of signal processing apparatus of broad domain oxygen sensor.
The technical solution of the utility model: broad domain oxygen sensor signal processing apparatus of the present utility model comprises to lambda sensor heating voltage treatment circuit, pump Current Control and signal deteching circuit, behind pump Current Control and signal deteching circuit, be provided with signal level treatment conversion circuit, signal level treatment conversion circuit comprises signal level biasing circuit, amplifying circuit and feedback circuit successively, and the output signal of signal level treatment conversion circuit is the voltage signal of 0-1V.
Described broad domain oxygen sensor signal processing apparatus, signal level biasing circuit comprise the bleeder circuit that resistance R 21, R22 form, and resistance R 9 is connected to operational amplifier U2 in-phase input end by the tie point of resistance R 21 and R22; Resistance R 7, R8 form the signal inversion input pickup resistance of operational amplifier U2; between the in-phase input end of operational amplifier U2 and output terminal, be connected with feedback circuit resistance R 10, be connected the circuit of forming protection by diode D3, D4 and capacitor C 12 between operational amplifier U2 signal input part resistance R 7 and the R8.
Described broad domain oxygen sensor signal processing apparatus, sensor heating power supply circuit by the vehicle accumulator input voltage as power supply, circuit comprises rearrangeable switch type voltage adjuster U3, the output of U3 is by resistance R 11, be connected to U3 by feedback resistance R13 after the R12 dividing potential drop, the output pin of U3 is connected to after capacitor C 11, the D2 filtering as the output terminal that heating voltage is provided to lambda sensor, provides heating voltage to lambda sensor.
The beneficial effects of the utility model are, the magnitude of voltage correspondence for the treatment of apparatus output the requirement of ECU (engine electric-controlled unit) input channel to sensor output, directly corresponding the air-fuel ratio of engine, its family curve is analogous to saltus step type lambda sensor, ECU internal hardware circuit does not need to change, built-in variable and steering logic as change, can not realize fuel oil (combustion gas) closed-loop control of system.
Description of drawings
Fig. 1 is a logic diagram of circuit of the present utility model;
Fig. 2 is an embodiment of sensor heating power supply circuit;
Fig. 3 is the circuit diagram of pump Current Control and testing circuit and signal level treatment conversion circuit;
Fig. 4 is the output characteristics figure of the lambda sensor of saltus step performance;
Fig. 5 is the broad domain oxygen sensor output characteristics figure after treated device is handled.
Among the figure: the 1st, vehicle accumulator input voltage, the output of 2 representative sensor heating power supply circuit, the 3rd, sensor heating power supply circuit, 4 represent the oxygen sensor signal input, the 5th, pump Current Control and testing circuit, the 6th, signal level treatment conversion circuit, the output of 7 representation signals.
Embodiment
Further specify embodiment of the present utility model below by accompanying drawing.
During broad domain oxygen sensor work, lambda sensor need be heated to uniform temperature, provide the pump Current Control to sensor, reach the purpose of the content of oxygen in the detection exhaust by the variation of testing pump electric current by certain circuit.Lambda sensor in normal working conditions, the oxygen content in output of its pump electric current and the exhaust has specific relation.The utility model adopts a kind of broad domain oxygen sensor treating apparatus that the signal of lambda sensor is handled just at the characteristic of broad domain oxygen sensor, and the signal after the processing is input to ECU.
Circuit bank composition of the present utility model is three parts: to sensor heating power pack, pump Current Control and input part, signal level and reverse conversion circuit.
Single-chip switching mode voltage adjuster is adopted in power supply to sensor, and supply voltage is adjustable, and the concrete parameter of requirement adjustment according to sensor adopts this circuit succinctly reliable.
Pump Current Control and testing circuit adopt PID (proportion integration differentiation) control model, adopt the single-chip treatment circuit, and the entire process mode is succinctly reliable.
Signal conversion circuit can be transformed into output signal the voltage signal of 0-1V, and this signal satisfies gasoline engine and transform as the requirement of the combustion gas electric-control system of lean-burn control by the gasoline engine electric-control system.
Fig. 1 is a logic diagram of circuit of the present utility model: the utility model comprises to lambda sensor heating voltage treatment circuit 3, pump Current Control and signal deteching circuit 5, signal level treatment conversion circuit 6; As power supply, its output 2 is connected to broad domain oxygen sensor 4 to lambda sensor heating voltage treatment circuit 3 by vehicle accumulator 1; The pump Current Control is connected acquired signal with the input end of signal deteching circuit 5 with broad domain oxygen sensor 4, and the output terminal of pump Current Control and signal deteching circuit 5 is connected to signal level treatment conversion circuit 6; The output 7 of signal level treatment conversion circuit 6;
Fig. 2 is an embodiment of sensor heating power supply circuit: vehicle accumulator input voltage 1 is handled by rearrangeable switch type voltage adjuster U3 (single-chip), again by resistance R 11, after the R12 dividing potential drop by capacitor C 11, stabilivolt D2 to output terminal 2, resistance R 13 is feedback resistances, last output terminal 2 provides heating voltage to lambda sensor, and this magnitude of voltage is set according to the requirement of concrete lambda sensor.
Fig. 3 is the circuit diagram of pump Current Control and testing circuit and signal level treatment conversion circuit:
Comprise pump Current Control and signal deteching circuit 5 and signal level treatment conversion circuit 6 among Fig. 3.Signal by broad domain oxygen sensor 4 inputs to pump Current Control and signal deteching circuit 5: pump Current Control and signal deteching circuit 5 comprise pump Current Control chip U4 and peripheral circuit operational amplifier U1, resistance R 5, R6 and capacitor C 8, this part is regulated the pump electric current of control lambda sensor by PID (proportion integration differentiation), and detects the amplitude and the direction of this electric current.Lambda sensor is under the situation of heating, this special unit of inner energy produces certain voltage, this magnitude of voltage is corresponding one by one with the air-fuel ratio of the residing environment of lambda sensor, the U4 control circuit produces an electric current, this electric current flows through lambda sensor inside, the voltage that inner this special unit of energy produces under the effect of this electric current changes, the pump current control unit according to the variation of this voltage regulate the direction of Control current and size with the voltage difference all-the-time stable that guarantees this special unit and produce at 450mV; Size by the testing pump electric current has reflected that indirectly the air-fuel ratio of this environment changes.The magnitude of voltage of U4 output is very faint, by the conversion raising carrying load ability of U1; The voltage of U1 output is handled through signal level treatment conversion circuit 6.
Signal level treatment conversion circuit 6 comprises signal level biasing circuit and feedback amplifier successively, the signal level biasing circuit is by the resistance R 21, the R22 dividing potential drop that are connected in the power supply, and resistance R 9 is connected to operational amplifier U2 in-phase input end by the tie point of resistance R 21 and R22; Resistance R 7, R8 form the signal inversion input pickup resistance of operational amplifier U2; amplify between the signal input part of U2 and the output terminal in computing and to be connected with feedback circuit resistance R 10, is connected by diode D3, D4 and capacitor C 12 between operational amplifier U2 signal input part resistance R 7 and the R8 and forms the circuit of protecting.The output signal of signal level treatment conversion circuit is the voltage signal of 0-1V.
The output signal 7 of signal level treatment conversion circuit 6 and the relation of the residing air-fuel ratio of lambda sensor are as shown in Figure 5.The scope of this signal is 0-1V, and the trend of variation diminishes gradually for this signal of increase along with air-fuel ratio.Fig. 4 is the output characteristics figure of the lambda sensor of saltus step performance, both variation tendencies are identical as can be seen from the figure, signal amplitude is similar, satisfy the characteristic of the needed lambda sensor of gasoline engine electric-control system, just realized detection to air-fuel ratio can being directly used in the lean-burn closed-loop control of fuel oil and combustion gas by the variation that detects voltage in ECM inside.
The traditional gasoline engine or the controller of gas engine use the lambda sensor of saltus step performance, are used for engine fuel or combustion gas closed-loop control.Adopt above device, engine electric-controlled unit hardware need not be changed, and software is not done under the situation of big change, promptly can be used for the fuel oil of Pressure charging thin combustion engine or the closed-loop control of combustion gas.
Core of the present utility model is to be provided with signal level treatment conversion circuit behind pump Current Control and signal deteching circuit, signal to broad domain oxygen sensor is nursed one's health, satisfy engine electric-controlled unit (ECU) requirement, realize fuel oil (combustion gas) closed-loop control of system.Therefore, every behind pump Current Control and signal deteching circuit signalization level treatment conversion circuit the signal of broad domain oxygen sensor is nursed one's health, all belong to protection domain of the present utility model.
Claims (3)
1. broad domain oxygen sensor signal processing apparatus, comprise to lambda sensor heating voltage treatment circuit, pump Current Control and signal deteching circuit, it is characterized in that: behind pump Current Control and signal deteching circuit, be provided with signal level treatment conversion circuit, signal level treatment conversion circuit comprises signal level biasing circuit, amplifying circuit and feedback circuit successively, and the output signal of signal level treatment conversion circuit is the voltage signal of 0-1V.
2. broad domain oxygen sensor signal processing apparatus according to claim 1, it is characterized in that: the signal level biasing circuit comprises the bleeder circuit that resistance (R21), (R22) form, and resistance (R9) is connected to operational amplifier (U2) in-phase input end by resistance (R21) and tie point (R22); Resistance (R7), (R8) form the signal inversion input pickup resistance of operational amplifier (U2); between the in-phase input end of operational amplifier (U2) and output terminal, be connected with feedback circuit resistance (R10), be connected the circuit of forming protection by diode (D3), (D4) and electric capacity (C12) between operational amplifier (U2) signal input part resistance (R7) and (R8).
3. broad domain oxygen sensor signal processing apparatus according to claim 1 and 2, it is characterized in that: sensor heating power supply circuit by the vehicle accumulator input voltage as power supply, circuit comprises rearrangeable switch type voltage adjuster (U3), (U3) output is by resistance (R11), (R12) be connected to (U3) by feedback resistance (R13) after the dividing potential drop, output pin (U3) is connected to after electric capacity (C11), (D2) filtering as the output terminal that heating voltage is provided to lambda sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620099469 CN200962097Y (en) | 2006-10-19 | 2006-10-19 | Wide-area oxygen sensor signal processing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620099469 CN200962097Y (en) | 2006-10-19 | 2006-10-19 | Wide-area oxygen sensor signal processing device |
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| CN200962097Y true CN200962097Y (en) | 2007-10-17 |
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| CN 200620099469 Expired - Lifetime CN200962097Y (en) | 2006-10-19 | 2006-10-19 | Wide-area oxygen sensor signal processing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260838B (en) * | 2008-04-23 | 2010-06-09 | 北京交通大学 | Broad domain oxygen sensor controller of vehicular gaseous propellant engine |
| CN102062007A (en) * | 2010-12-22 | 2011-05-18 | 潍柴动力股份有限公司 | Rail pressure control method and rail pressure pre-control method and system for engine |
| CN102108906A (en) * | 2009-12-24 | 2011-06-29 | 联创汽车电子有限公司 | Engine control parameter adjustment method |
| CN102855344A (en) * | 2012-06-11 | 2013-01-02 | 浙江吉利汽车研究院有限公司杭州分公司 | Wide-band oxygen sensor algorithm checking and parameter optimizing method based on simulation |
| CN106150725A (en) * | 2016-08-05 | 2016-11-23 | 华中科技大学 | A kind of broad domain oxygen sensor controller |
-
2006
- 2006-10-19 CN CN 200620099469 patent/CN200962097Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260838B (en) * | 2008-04-23 | 2010-06-09 | 北京交通大学 | Broad domain oxygen sensor controller of vehicular gaseous propellant engine |
| CN102108906A (en) * | 2009-12-24 | 2011-06-29 | 联创汽车电子有限公司 | Engine control parameter adjustment method |
| CN102108906B (en) * | 2009-12-24 | 2013-04-10 | 联创汽车电子有限公司 | Engine control parameter adjustment method |
| CN102062007A (en) * | 2010-12-22 | 2011-05-18 | 潍柴动力股份有限公司 | Rail pressure control method and rail pressure pre-control method and system for engine |
| CN102062007B (en) * | 2010-12-22 | 2012-11-21 | 潍柴动力股份有限公司 | Rail pressure control method and rail pressure pre-control method and system for engine |
| CN102855344A (en) * | 2012-06-11 | 2013-01-02 | 浙江吉利汽车研究院有限公司杭州分公司 | Wide-band oxygen sensor algorithm checking and parameter optimizing method based on simulation |
| CN106150725A (en) * | 2016-08-05 | 2016-11-23 | 华中科技大学 | A kind of broad domain oxygen sensor controller |
| CN106150725B (en) * | 2016-08-05 | 2019-06-18 | 华中科技大学 | A kind of broad domain oxygen sensor controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: DONGFENG COMMERCIAL VEHICLE CO., LTD. Free format text: FORMER OWNER: DONGFENG AUTOMOBILE CO., LTD. Effective date: 20130917 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 430056 WUHAN, HUBEI PROVINCE TO: 442001 SHIYAN, HUBEI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130917 Address after: 442001 Shiyan City, Hubei province city Zhangwan District Road No. 2 Patentee after: Dongfeng Commercial Vehicle Co.,Ltd. Address before: 430056 No. 10 Dongfeng Avenue, Zhuankou economic and Technological Development Zone, Wuhan, Hubei, Hanyang, Wuhan Patentee before: DONGFENG MOTER Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071017 |
|
| EXPY | Termination of patent right or utility model |