CN111398359B - Oxygen sensor signal processing circuit and oxygen sensor heating closed-loop control method using same - Google Patents
Oxygen sensor signal processing circuit and oxygen sensor heating closed-loop control method using same Download PDFInfo
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- CN111398359B CN111398359B CN202010194958.4A CN202010194958A CN111398359B CN 111398359 B CN111398359 B CN 111398359B CN 202010194958 A CN202010194958 A CN 202010194958A CN 111398359 B CN111398359 B CN 111398359B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
本发明揭示了一种氧传感器信号处理电路及应用该电路的氧传感器加热闭环控制方法。电路与发动机控制单元相匹配，包括氧传感器、第一电阻、第二电阻、第三电阻、第四电阻、定额电阻以及三极管。方法通过对氧传感器锆元件的电阻值进行测量和闭环控制，实现对氧传感器锆元件工作温度的精确控制。本发明可以有效地消除氧传感器工作温度对传感器输出信号的影响，且通过对氧传感器工作温度的精确控制也可以最大限度上地提高氧传感器的使用寿命、降低后续的维护成本。
The present invention discloses an oxygen sensor signal processing circuit and an oxygen sensor heating closed-loop control method using the circuit. The circuit matches an engine control unit and includes an oxygen sensor, a first resistor, a second resistor, a third resistor, a fourth resistor, a rated resistor, and a triode. The method measures and performs closed-loop control on the resistance value of the oxygen sensor zirconium element to achieve precise control of the operating temperature of the oxygen sensor zirconium element. The present invention can effectively eliminate the influence of the oxygen sensor operating temperature on the sensor output signal, and can also maximize the service life of the oxygen sensor and reduce subsequent maintenance costs by precisely controlling the oxygen sensor operating temperature.
Description
Technical Field
The invention relates to a signal processing circuit and a control method using the same, in particular to an oxygen sensor signal processing circuit and an oxygen sensor heating closed-loop control method using the same, and belongs to the technical field of automobile engine electric control.
Background
In the design and use of an electrospray vehicle, a three-way catalyst must be used to achieve high exhaust gas purification rates and to reduce carbon monoxide, hydrocarbons and nitrogen oxides in the exhaust gas. Effective use of a three-way catalyst requires that the air-fuel ratio must be accurately controlled so that it always approaches the stoichiometric air-fuel ratio, and under such use requirements, the oxygen sensor is gradually applied and popularized.
The oxygen sensor is used for measuring whether oxygen in exhaust gas after engine combustion is excessive or not, namely acquiring the oxygen content, converting the oxygen content into a voltage signal and transmitting the voltage signal to an engine computer, so that the engine can realize closed-loop control aiming at an excessive air factor, and the three-way catalytic converter ensures the maximum conversion efficiency of three pollutants of hydrocarbon, carbon monoxide and oxynitride in the exhaust gas, and maximally converts and purifies the discharged pollutants.
In practical application, water is generated after fuel is combusted in an automobile engine, and the generated water exists in a gaseous state under a high-temperature condition, and when a vehicle is started at a low temperature, the generated water is condensed into water drops due to a lower temperature in an exhaust pipe. These generated water droplets are likely to enter the inside of the oxygen sensor mounted in the exhaust pipe, and affect the normal use of the oxygen sensor. Therefore, the oxygen sensors for various vehicles commonly used at present generally have a self-heating function in order to quickly reach the working temperature and enable the vehicles to enter closed-loop control.
In the prior art, the heating control of the oxygen sensor is generally realized by adopting a mode of calibrating open-loop control voltage in advance, but the mode can not realize the accurate control of the temperature of a zirconium element in the oxygen sensor under different environments and working conditions, the problem of reduced accuracy of an output signal caused by abnormal working temperature of the oxygen sensor is easily solved, and in addition, the mode has high requirement on the calibration accuracy of the preset open-loop control electric compacting vehicle and great calibration workload.
In summary, if a method for controlling the heating closed loop of the oxygen sensor can be provided, the above-mentioned effects are eliminated as much as possible by utilizing the principle of closed loop control, and the troubleshooting and the judgment of the oxygen heating related faults are completed according to the internal resistance of the zirconium element in the real vehicle, so that the subsequent OBD (On Board Diagnostics) diagnosis is convenient, which is also a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides an oxygen sensor signal processing circuit and an oxygen sensor heating closed-loop control method using the same, which are specifically as follows.
An oxygen sensor signal processing circuit matched with an engine control unit comprises an oxygen sensor (1), a first resistor (2), a second resistor (3), a third resistor (4), a fourth resistor (5), a quota resistor (6) and a triode (7);
One end of the oxygen sensor (1) is electrically connected with the third resistor (4), the fourth resistor (5) and the quota resistor (6) respectively;
One end of the first resistor (2) is electrically connected with an external power supply anode, and the other end of the first resistor (2) is electrically connected with the second resistor (3);
one end of the second resistor (3) is electrically connected with the first resistor (2) and the third resistor (4) respectively;
One end of the third resistor (4) is electrically connected with the first resistor (2) and the second resistor respectively, and the other end of the third resistor (4) is electrically connected with the fourth resistor (5), the quota resistor (6) and the triode (7) respectively;
One end of the fourth resistor (5) is electrically connected with the triode (7), and the other end of the fourth resistor (5) is electrically connected with the third resistor (4), the quota resistor (6) and the oxygen sensor (1) respectively;
One end of the rated resistor (6) is electrically connected with the third resistor (4), the fourth resistor (5) and the oxygen sensor (1) respectively, and the other end of the rated resistor (6) is used as an oxygen sensor voltage acquisition end and is electrically connected with the engine control unit;
One end electric connection of triode (7) has external power supply positive pole, the other end electric connection of triode (7) has fourth resistance (5), the still other end of triode (7) be as oxygen sensor resistance measurement control end with engine control unit electric connection.
Preferably, the resistance value of the first resistor (2) ranges from 1KΩ to 5KΩ, the resistance value of the second resistor (3) ranges from 0.5KΩ to 5KΩ, the resistance value of the third resistor (4) ranges from 20KΩ to 100K Ω, and the resistance value of the fourth resistor (5) ranges from 1KΩ to 10KΩ.
Preferably, the resistance value of the first resistor (2) is 1.78KΩ, the resistance value of the second resistor (3) is 1KΩ, the resistance value of the third resistor (4) is 56.2KΩ, and the resistance value of the fourth resistor (5) is 8.25KΩ.
Preferably, the rated resistor (6) has a resistance value of 10kΩ.
An oxygen sensor heating closed-loop control method using the oxygen sensor signal processing circuit described above includes the steps of:
S1, an engine control unit controls an oxygen sensor resistor measurement control end to output signals and turns on a triode (7) in an interrupt stage of an internal singlechip, and simultaneously reads an AD value of an oxygen sensor voltage acquisition end;
S2, the engine control unit calculates the actual resistance value of the oxygen sensor by using the data acquired in the S1, wherein a calculation formula is as follows
,
Wherein, Indicating the actual resistance value of the oxygen sensor,Represents the AD value of the voltage acquisition end of the oxygen sensor,A fourth resistance value;
and S3, after the engine control unit calculates the actual resistance value of the oxygen sensor, using a PI closed-loop control algorithm to enable the actual resistance value of the oxygen sensor to be kept near the target resistance value of the oxygen sensor by utilizing the heating voltage of the oxygen sensor.
Preferably, the PI closed-loop control algorithm formula in S3 is
,
Wherein, Indicating the heating voltage of the oxygen sensor,Representing the closed-loop control P term,Representing the closed-loop control I term,Represents an open loop term of the oxygen sensor heating voltage,
The difference between the actual resistance value of the current oxygen sensor and the target resistance value of the oxygen sensor is represented by the calculation formula
。
Preferably, in the PI closed-loop control algorithm described in S3, the values of each parameter are:=0.05V/Ω,=0.02V/Ω,=1sec,=0.1sec,=8.5V。
the advantages of the invention are mainly embodied in the following aspects:
The oxygen sensor heating closed-loop control method provided by the invention can effectively ensure the accuracy of the engine control unit on the control of the working temperature of the zirconium element in the oxygen sensor and eliminate the influence of the working temperature of the oxygen sensor on the output signal of the sensor. Moreover, the service life of the oxygen sensor can be prolonged to the greatest extent and the subsequent maintenance cost can be reduced by precisely controlling the working temperature of the oxygen sensor.
Meanwhile, corresponding to the control method, the oxygen sensor signal processing circuit based on the method has the advantages of simple overall structure, excellent use effect, mature technology and easy-to-obtain electrical components for all parts in the hardware part, and all enterprises can obtain the technical scheme of the hardware part through simple transformation and processing of the existing parts, so that the hardware processing cost is low, and the method is favorable for large-scale popularization and use.
In addition, the invention provides reference for other related problems in the same field, can be used for expanding and extending based on the reference, and has very wide application prospect when applied to other technical schemes in the same field.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, so that the technical scheme of the present invention can be understood and mastered more easily.
Drawings
FIG. 1 is a schematic diagram of an oxygen sensor signal processing circuit according to the present invention;
The oxygen sensor comprises a sensor body, an oxygen sensor, a first resistor, a second resistor, a third resistor, a fourth resistor, a quota resistor, a triode and a triode, wherein the oxygen sensor comprises a sensor body 1, a first resistor, a resistor 3, a second resistor, a resistor 4, a third resistor, a resistor 5, a fourth resistor, a quota resistor 6 and a triode.
Detailed Description
The invention provides an oxygen sensor signal processing circuit and an oxygen sensor heating closed-loop control method using the same, and the method is as follows.
As shown in fig. 1, an oxygen sensor signal processing circuit, which is matched with an engine control unit (ElectronicControl Unit, ECU), includes an oxygen sensor 1, a first resistor 2, a second resistor 3, a third resistor 4, a fourth resistor 5, a quota resistor 6, and a triode 7.
One end of the oxygen sensor 1 is electrically connected with the third resistor 4, the fourth resistor 5 and the quota resistor 6 respectively.
One end of the first resistor 2 is electrically connected with an external power supply positive electrode, and the other end of the first resistor 2 is electrically connected with the second resistor 3.
One end of the second resistor 3 is electrically connected with the first resistor 2 and the third resistor 4 respectively.
One end of the third resistor 4 is electrically connected with the first resistor 2 and the second resistor respectively, and the other end of the third resistor 4 is electrically connected with the fourth resistor 5, the quota resistor 6 and the oxygen sensor 1 respectively.
One end of the fourth resistor 5 is electrically connected with the triode 7, and the other end of the fourth resistor 5 is electrically connected with the third resistor 4, the quota resistor 6 and the oxygen sensor 1 respectively.
One end of the rated resistor 6 is electrically connected with the third resistor 4, the fourth resistor 5 and the oxygen sensor 1 respectively, and the other end of the rated resistor 6 is an output end of the whole circuit and is electrically connected with the engine control unit as an oxygen sensor voltage acquisition end.
One end of the triode 7 is electrically connected with an external power supply anode, the other end of the triode 7 is electrically connected with the fourth resistor 5, and the other end of the triode 7 is an input end of the whole circuit and is used as an oxygen sensor resistor measurement control end to be electrically connected with the engine control unit.
The selection criteria of the resistors are as follows, the resistance value range of the first resistor 2 is 1KΩ -5 KΩ, the resistance value range of the second resistor 3 is 0.5KΩ -5 KΩ, the resistance value range of the third resistor 4 is 20KΩ -100K Ω, and the resistance value range of the fourth resistor 5 is 1KΩ -10 KΩ.
In this embodiment, the resistance value of the first resistor 2 is 1.78kΩ, the resistance value of the second resistor 3 is 1kΩ, the resistance value of the third resistor 4 is 56.2kΩ, the resistance value of the fourth resistor 5 is 8.25kΩ, and the resistance value of the rated resistor 6 is 10kΩ.
The invention also discloses an oxygen sensor heating closed-loop control method, which uses the oxygen sensor signal processing circuit. Because the temperature of the zirconium element in the oxygen sensor 1 has a definite one-to-one correspondence with the resistance value, in the method, the engine control unit software realizes the accurate control of the working temperature of the oxygen sensor 1 by measuring and performing closed-loop control on the resistance value of the zirconium element in the oxygen sensor 1.
The method specifically comprises the following steps:
S1, an engine control unit controls an oxygen sensor resistor to measure a control end output signal and turns on a triode 7 in an interrupt stage of an internal singlechip, and simultaneously reads an AD value of a voltage acquisition end of the oxygen sensor;
S2, the engine control unit calculates the actual resistance value of the oxygen sensor by using the data acquired in the S1, wherein a calculation formula is as follows
,
Wherein, Indicating the actual resistance value of the oxygen sensor,Represents the AD value of the voltage acquisition end of the oxygen sensor,A fourth resistance value;
and S3, after the engine control unit calculates the actual resistance value of the oxygen sensor, using a PI closed-loop control algorithm to enable the actual resistance value of the oxygen sensor to be kept near the target resistance value of the oxygen sensor (the target resistance value of the oxygen sensor is the resistance value of the corresponding optimal working temperature of the oxygen sensor) by utilizing the heating voltage of the oxygen sensor.
S3, the PI closed-loop control algorithm formula is as follows
,
Wherein, Indicating the heating voltage of the oxygen sensor,Representing the closed-loop control P term,Representing the closed-loop control I term,Represents an open loop term of the oxygen sensor heating voltage,
The difference between the actual resistance value of the current oxygen sensor and the target resistance value of the oxygen sensor is represented by the calculation formula
。
In the PI closed-loop control algorithm described in S3, the values of the parameters are:=0.05V/Ω,=0.02V/Ω,=1sec,=0.1sec,=8.5V。
The oxygen sensor heating closed-loop control method provided by the invention can effectively ensure the accuracy of the engine control unit on the control of the working temperature of the zirconium element in the oxygen sensor and eliminate the influence of the working temperature of the oxygen sensor on the output signal of the sensor. Moreover, the service life of the oxygen sensor can be prolonged to the greatest extent and the subsequent maintenance cost can be reduced by precisely controlling the working temperature of the oxygen sensor.
Meanwhile, corresponding to the control method, the oxygen sensor signal processing circuit based on the method has the advantages of simple overall structure, excellent use effect, mature technology and easy-to-obtain electrical components for all parts in the hardware part, and all enterprises can obtain the technical scheme of the hardware part through simple transformation and processing of the existing parts, so that the hardware processing cost is low, and the method is favorable for large-scale popularization and use.
In addition, the invention provides reference for other related problems in the same field, can be used for expanding and extending based on the reference, and has very wide application prospect when applied to other technical schemes in the same field.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
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| CN114138031B (en) * | 2021-11-23 | 2023-03-07 | 奇瑞汽车股份有限公司 | Method, device, storage medium, and program for controlling heating of oxygen sensor |
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| KR100992763B1 (en) * | 2008-05-14 | 2010-11-05 | 현대자동차주식회사 | Signal Processing Method of Binary Oxygen Sensor |
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