CN101976086A - Oxygen sensor heating control method and heating control circuit adopting same - Google Patents
Oxygen sensor heating control method and heating control circuit adopting same Download PDFInfo
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- CN101976086A CN101976086A CN 201010524192 CN201010524192A CN101976086A CN 101976086 A CN101976086 A CN 101976086A CN 201010524192 CN201010524192 CN 201010524192 CN 201010524192 A CN201010524192 A CN 201010524192A CN 101976086 A CN101976086 A CN 101976086A
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Abstract
The invention relates to an oxygen sensor heating control method and a heating control circuit adopting the same, wherein the heating control circuit comprises a bridge circuit, a voltage regulation circuit and an error amplifying circuit; the size of variable resistance in the bridge circuit can be set according to the heating temperature needed to be reached by the interior of an oxygen senor; the voltage regulation circuit provides heating voltages for the bridge circuit; the voltage size is regulated through the error amplifying circuit; and the resistance value of the heating element of the oxygen sensor is controlled to be constant. By utilizing the favorable temperature characteristic of the heating element of the oxygen sensor, the invention carries out constant resistance value control on the heating element so as to enable the oxygen sensor to be stable at a set temperature, thus not only ensuring the stability of the heating temperature of the oxygen sensor but also laying a basis for the detection reliability of the oxygen sensor.
Description
Technical field
The present invention relates to a kind of lambda sensor, relate in particular to lambda sensor internal temperature method for heating and controlling and control circuit.
Background technology
Oxygen concentration detects in fields such as military, civilian, medical treatment all demand, as the oxygen concentration size in the monitor vehicle exhaust.Lambda sensor is adopted in monitoring to oxygen concentration, and lambda sensor is made up of sensitive element and heating element usually, and wherein, sensitive element is mainly made by zirconia material, and heating element adopts the alloy platinum material with good temperature characteristics to make.Sensitive element need just can be worked afterwards effectively reaching design temperature (for example 600 ℃).Concrete principle of work is to utilize zirconia ceramics under high temperature (500 ℃～700 ℃) condition, and oxygen molecule is produced ionizing event, i.e. ionization is oxygen atom, and electronegative oxonium ion is adsorbed on the zirconic surfaces externally and internally.Because the oxygen in the atmosphere is more than the oxygen in the waste gas, the concentration difference of both sides ion produces electromotive force, handles to analyze the oxygen concentration in the exhaust through subsequent conditioning circuit.And the oxygen molecule quantity that is ionized is relevant with oxygen concentration, sensor internal heating-up temperature etc., detects the data accuracy that obtains for guaranteeing lambda sensor, must guarantee that its heating-up temperature is stable, and not influenced by peripheral environment.As seen will make stable, the reliably working of sensor, it is accurate to detect data, and heating and temperature control is most important.
Summary of the invention
Thereby the object of the invention provides a kind of stable method for heating and controlling that guarantees the sensor measurement accuracy of the inner heating-up temperature of lambda sensor that can make.
In order to achieve the above object, the technical solution adopted in the present invention is: a kind of lambda sensor method for heating and controlling, described lambda sensor comprises sensitive element and heating element, this method is carried out constant control by the resistance value to described heating element, realizes the stable control of the inner heating-up temperature of lambda sensor.
Further, the heating resistor that described heating element is made by the alloy platinum material with good temperature characteristics, thus make this heating element can also have the effect of temperature element.
The temperature that reaches is as required set the resistance value of described heating element program controlly.
The present invention also provides a kind of lambda sensor heating control circuit, and the technical scheme that it adopted is: a kind of lambda sensor heating control circuit, it comprises
Bridge diagram, it comprises first fixed resistance, second fixed resistance, variable resistor, described first fixed resistance is connected with variable resistor to form and sets brachium pontis, heating element in described second fixed resistance and the lambda sensor is electrically connected and forms the heating brachium pontis, and the setting brachium pontis is in parallel with the heating brachium pontis;
Voltage-regulating circuit, it is electrically connected with a common link of setting brachium pontis and heating brachium pontis, is used to bridge diagram that heating voltage is provided;
Error amplifying circuit, it is connected electrically between bridge diagram and the voltage-regulating circuit, is used to gather set on the brachium pontis on first fixed resistance and heating brachium pontis the voltage of second fixed resistance and two magnitudes of voltage of gathering are compared with to voltage-regulating circuit output voltage adjustment signal;
The heating-up temperature that will reach according to lambda sensor inside, set described variable-resistance size, described voltage-regulating circuit provides heating voltage to bridge diagram, and regulates the output voltage size by error amplifying circuit, and the resistance value of heating element of controlling described lambda sensor is constant.
According to technique scheme in the concrete mode of implementing, described variable resistor is a programmable resistance, according to the temperature that lambda sensor inside needs reach, sets variable-resistance resistance value program controlly.
When the lambda sensor initialization, described variable resistor resistance makes it increase to the resistance of setting lentamente by program control adjusting.
Owing to adopt technique scheme, the present invention has the following advantages: the present invention utilizes the heating element of lambda sensor to have good temperature characterisitic, heating element is carried out permanent resistance value control, make the temperature that is in setting that lambda sensor can be stable, promptly guaranteed the stable of lambda sensor heating-up temperature, the reliability that detects for lambda sensor lays the foundation.
Description of drawings
Accompanying drawing 1 is lambda sensor heating control circuit theory diagram of the present invention;
Wherein: 1, bridge diagram; 2, voltage-regulating circuit; 3, error amplifying circuit;
Embodiment
Below in conjunction with accompanying drawing, the preferred specific embodiment of the present invention is described:
Lambda sensor of the present invention is the zirconia-type sensor, and its inside also is provided with heating element, and heating element is made by the alloy platinum material with good temperature characteristics, and this heating element has resistance value Rd, and this resistance value Rd and temperature have the relation shown in the formula (1):
Rd＝(1+k·T)·Rd0(1)
In the formula: T is a temperature;
Rd0 is the resistance of heating element under 0 ℃ of condition;
K is a constant, and is relevant with alloy platinum material;
Thus we as can be seen, the resistance Rd of heating element is directly proportional with temperature T, and heating-up temperature is relevant with the voltage on being applied to this heating element, voltage is high more, and the heat of generation is just many more, and corresponding heating-up temperature will raise, simultaneously, the resistance value of heating element also can increase.
According to above-mentioned principle, in order to reach being under the temperature of setting that lambda sensor can be stable, the invention provides a kind of method for heating and controlling, it carries out constant control by the resistance value to described heating element, realize the stable control of the inner heating-up temperature of lambda sensor, promptly work as lambda sensor and need reach a certain temperature, as 600 ℃, as long as the resistance value of control heating element makes the constant following resistance value of correspondence of answering of this temperature that is in of its resistance value get final product.
Be applied under the different working temperatures in order to adapt to lambda sensor, method for heating and controlling of the present invention, the resistance value of heating element can be carried out program control adjustment, thereby can set the resistance value of heating element according to the needs that use flexibly.
According to above-mentioned control method, the present invention also provides a kind of lambda sensor heating control circuit, as shown in Figure 1, introduces circuit theory for clear, in circuit shown in Figure 1, the lambda sensor heating element is represented with resistance, calls heating resistor Rd in the following text.Whole heating control circuit mainly is made up of bridge diagram 1, voltage-regulating circuit 2 and error amplifying circuit 3, wherein, bridge diagram 1 is made up of variable resistor Rc, heating resistor Rd and the first fixed resistance Ra and the second fixed resistance Rb, wherein, the first fixed resistance Ra and variable resistor Rc form and set brachium pontis, the second fixed resistance Rb and heating resistor Rd heating work brachium pontis are set brachium pontis and the heating work brachium pontis formation bridge circuit that is in parallel.The output terminal of voltage-regulating circuit 2 is connected with a public connecting end of setting brachium pontis and heating work brachium pontis, error amplifying circuit 3 is connected between bridge diagram 1 and the voltage-regulating circuit 2, particularly, error amplifying circuit 3 has two input ends, one of them input end is connected with the voltage end of the first fixed resistance Ra, be used to gather the magnitude of voltage on the first fixed resistance Ra, another input end is connected with the voltage end of the second fixed resistance Rb, is used to gather the magnitude of voltage on the second fixed resistance Rb.The output terminal of error amplifying circuit 3 and voltage-regulating circuit 2 are electrically connected, during work, it outputs control signals to voltage-regulating circuit 2 according to the difference between the voltage of the voltage on the first fixed resistance Ra and the second fixed resistance Rb, and this voltage-regulating circuit 2 is adjusted the size of its output voltage V o according to received signal.
According to foregoing circuit, we can derive the relation of the last voltage Va of the first fixed resistance Ra and last voltage Vb of the second fixed resistance Rb and output voltage V o, see formula (2):
Va＝Rc/(Ra+Rc)·Vo (2)
Vb＝Rd/(Rb+Rd)·Vo (3)
So, when bridge balancing, have:
Ra/Rc＝Rb/Rd (4)
By formula (4) we as can be seen, under the fixing situation of the first fixed resistance Ra and the second fixed resistance Rb resistance, the size of heating resistor Rd resistance is only relevant with the resistance size of variable resistor Rc.So, by change the size of variable resistor Rc from the outside, it is identical to make that itself and heating resistor Rd wait to reach the corresponding resistance value of temperature, can realize the constant of heating resistor Rd resistance, guaranteed the stable of lambda sensor heater element resistance value, promptly realized the permanent resistance value of heating resistor is controlled by variable resistor.
In the present embodiment, the first fixed resistance Ra is identical with the resistance of the second fixed resistance Rb, and variable resistor Rc is a programmable resistance, and is promptly thermally-stabilised according to setting adding of needs, set variable-resistance resistance value program controlly, guarantee the flexible Application of lambda sensor under different temperatures.
Concrete control procedure is:
At first, the temperature that requires according to lambda sensor is set the resistance value of variable resistor Rc, but the setting through type (2) of this resistance value obtains; Then, trigger voltage is adjusted circuit 2, it is to the bridge diagram output voltage, error amplifying circuit constantly detects bridge circuit voltage Va, Vb in this process, and its difference is amplified, when detecting voltage Va＞Vb, show resistance R d＜Rc, temperature is lower than the setting requirement, and voltage-regulating circuit is with the rising heating voltage, to improve heating-up temperature; When detecting voltage Va＜Vb, show resistance R d＞Rc, temperature is higher than the setting requirement, and voltage-regulating circuit will reduce heating voltage, to reduce heating-up temperature.
From control procedure as can be known: after variable resistor Rc sets, no matter which kind of variation is external environment condition do, as temperature variation, fluctuations in discharge etc., cause when heating-up temperature changes, heating control circuit of the present invention all can be by regulating heating voltage to change the control procedure of heating-up temperature, and the resistance Rd all-the-time stable of heating element that makes lambda sensor is in setting value.
Because variable resistor adopts programmable resistance, so during initialization, the resistance by programmable resistance Rc is regulated in good time programming makes its slow increase, voltage-regulating circuit is controlled the corresponding with it rising of heating-up temperature accordingly, makes this heating control circuit have the function of soft start.
The purpose that lambda sensor adds heat control is to guarantee that its inner heating-up temperature meets the setting requirement, and it is stable, heating control circuit of the present invention, only need to adjust variable resistor resistance size, make bridge diagram be in equilibrium state, can realize that heating resistor is stabilized on the setting value, just realize the permanent resistance control of heating resistor.
The present embodiment heating control circuit has following advantage to the control of lambda sensor:
1) during initialization, adopt soft-start mode, promptly temperature slowly rises, and can reach design temperature in the 30s left and right sides time.
2) duration of work keeps temperature stabilization, is not subjected to factor affecting such as peripheral environment temperature, gas flow, has the automatic temperature-adjusting control function.
The foregoing description only is explanation technical conceive of the present invention and characteristics; its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this; can not limit protection scope of the present invention with this; all equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. lambda sensor method for heating and controlling, described lambda sensor comprises sensitive element and heating element, it is characterized in that: this method is carried out constant control by the resistance value to described heating element, realizes the stable control of the inner heating-up temperature of lambda sensor.
2. lambda sensor method for heating and controlling according to claim 1 is characterized in that: the heating resistor that described heating element is made by the alloy platinum material with good temperature characteristics.
3. lambda sensor method for heating and controlling according to claim 1 and 2 is characterized in that: the temperature that reaches as required, set the resistance value of described heating element program controlly.
4. heating control circuit that adopts the described lambda sensor method for heating and controlling of claim 1, it is characterized in that: it comprises
Bridge diagram (1), it comprises first fixed resistance (Ra), second fixed resistance (Rb), variable resistor (Rc), described first fixed resistance (Ra) is connected with variable resistor (Rc) to form and sets brachium pontis, heating element (Rd) in described second fixed resistance (Rb) and the lambda sensor is electrically connected and forms the heating brachium pontis, and sets brachium pontis and be in parallel with the heating brachium pontis;
Voltage-regulating circuit (2), it is electrically connected with a common link of setting brachium pontis and heating brachium pontis, is used to bridge diagram (1) that heating voltage is provided;
Error amplifying circuit (3), it is connected electrically between bridge diagram (1) and the voltage-regulating circuit (2), is used for gather setting on the brachium pontis voltage of second fixed resistance (Rb) on first fixed resistance (Ra) and heating brachium pontis and two magnitudes of voltage of collection are compared with to voltage-regulating circuit (2) output voltage adjustment signal;
The heating-up temperature that will reach according to lambda sensor inside, set the size of described variable resistor (Rc), described voltage-regulating circuit (2) provides heating voltage to bridge diagram (1), and regulate the output voltage size by error amplifying circuit (3), the resistance value of heating element (Rd) of controlling described lambda sensor is constant.
5. lambda sensor heating control circuit according to claim 4 is characterized in that: described first fixed resistance (Ra) is identical with the resistance of second fixed resistance (Rb).
6. according to claim 4 or 5 described lambda sensor heating control circuits, it is characterized in that: described variable resistor (Rc) is a programmable resistance, according to the temperature that lambda sensor inside needs reach, sets the resistance value of variable resistor (Rc) program controlly.
7. lambda sensor heating control circuit according to claim 6 is characterized in that: when the lambda sensor initialization, described variable resistor (Rc) resistance makes it increase to the resistance of setting lentamente by program control adjusting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010524192 CN101976086A (en) | 2010-10-29 | 2010-10-29 | Oxygen sensor heating control method and heating control circuit adopting same |
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| CN 201010524192 CN101976086A (en) | 2010-10-29 | 2010-10-29 | Oxygen sensor heating control method and heating control circuit adopting same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777657A (en) * | 2012-10-24 | 2014-05-07 | 联创汽车电子有限公司 | Oxygen sensor heating control method |
| CN103905036A (en) * | 2014-03-26 | 2014-07-02 | 广东大普通信技术有限公司 | Temperature control circuit of constant-temperature crystal oscillator |
| CN103984376A (en) * | 2014-05-14 | 2014-08-13 | 马鞍山恒瑞测量设备有限公司 | Circuit for controlling heating power of load |
| CN110430623A (en) * | 2019-07-09 | 2019-11-08 | 广东美的厨房电器制造有限公司 | A kind of heating means and its heating device of lambda sensor |
| CN111142590A (en) * | 2018-11-02 | 2020-05-12 | 北京北方华创微电子装备有限公司 | Temperature control system and method |
| CN113125543A (en) * | 2021-04-09 | 2021-07-16 | 合肥合试检测股份有限公司 | Driving and detecting device for zirconia oxygen concentration sensor |
| CN114264070A (en) * | 2021-12-22 | 2022-04-01 | 广东铭沁环保科技有限公司 | Gas heating device and heating method |
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| CN1675522A (en) * | 2002-07-19 | 2005-09-28 | 迅捷集团公司 | Variable resistance sensor with common reference leg |
| CN1834593A (en) * | 2005-03-18 | 2006-09-20 | 株式会社日立制作所 | Thermal flow meter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777657A (en) * | 2012-10-24 | 2014-05-07 | 联创汽车电子有限公司 | Oxygen sensor heating control method |
| CN103777657B (en) * | 2012-10-24 | 2016-08-17 | 联创汽车电子有限公司 | Oxygen sensor method for heating and controlling |
| CN103905036A (en) * | 2014-03-26 | 2014-07-02 | 广东大普通信技术有限公司 | Temperature control circuit of constant-temperature crystal oscillator |
| CN103905036B (en) * | 2014-03-26 | 2017-02-08 | 广东大普通信技术有限公司 | Temperature control circuit of constant-temperature crystal oscillator |
| CN103984376A (en) * | 2014-05-14 | 2014-08-13 | 马鞍山恒瑞测量设备有限公司 | Circuit for controlling heating power of load |
| CN111142590A (en) * | 2018-11-02 | 2020-05-12 | 北京北方华创微电子装备有限公司 | Temperature control system and method |
| CN111142590B (en) * | 2018-11-02 | 2021-08-13 | 北京北方华创微电子装备有限公司 | Temperature control system and method |
| CN110430623A (en) * | 2019-07-09 | 2019-11-08 | 广东美的厨房电器制造有限公司 | A kind of heating means and its heating device of lambda sensor |
| CN110430623B (en) * | 2019-07-09 | 2022-02-01 | 广东美的厨房电器制造有限公司 | Heating method and heating device of oxygen sensor |
| CN113125543A (en) * | 2021-04-09 | 2021-07-16 | 合肥合试检测股份有限公司 | Driving and detecting device for zirconia oxygen concentration sensor |
| CN114264070A (en) * | 2021-12-22 | 2022-04-01 | 广东铭沁环保科技有限公司 | Gas heating device and heating method |
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Application publication date: 20110216 |