CN102928471A - Oxygen sensor performance testing device and method - Google Patents
Oxygen sensor performance testing device and method Download PDFInfo
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- CN102928471A CN102928471A CN201210411406XA CN201210411406A CN102928471A CN 102928471 A CN102928471 A CN 102928471A CN 201210411406X A CN201210411406X A CN 201210411406XA CN 201210411406 A CN201210411406 A CN 201210411406A CN 102928471 A CN102928471 A CN 102928471A
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Abstract
The invention provides an oxygen sensor performance testing device and method. The oxygen sensor performance testing device comprises an electronic control unit, a measurement control circuit, an oxygen pumping element current testing unit, an oxygen sensor signal voltage testing unit, an simulated combustion chamber, a temperature sensor, a numerical-control temperature adjustment controller, a nozzle and a switching power supply, wherein the electronic control unit, the measurement control circuit and the oxygen pumping element current testing unit are connected in sequence; one end of the oxygen sensor signal voltage testing unit is connected to the measurement control circuit, and the other end of the oxygen sensor signal voltage testing unit is grounded; the temperature sensor is arranged in the simulated combustion chamber and is used for testing the working temperature of the tested oxygen sensor; the numerical-control temperature adjustment controller is in electrode connection with the temperature sensor and is used for controlling the working temperature of the tested oxygen sensor; one end of the nozzle is communicated with the simulated combustion chamber, an adjusting valve is arranged at the other end of the nozzle, and a butane gas enters the simulated combustion chamber through the nozzle and combusts; and the switching power supply is connected with the electronic control unit, the measurement control circuit and the numerical-control temperature adjustment controller and used for supplying power. The oxygen sensor performance testing device and method disclosed by the invention can be used for accurately testing the performances of a broadband oxygen sensor and a common oxygen sensor.
Description
Technical field
The invention relates to a kind of sensor performance detection technique, and particularly relevant for a kind of oxygen sensor performance pick-up unit and method, it can detect to automobile broadband sensor or ordinary oxygen sensor.
Background technology
The basic control principle of automobile broadband lambda sensor expands as the basis take common zirconia-type oxygen sensor exactly.Zirconia-type oxygen sensor has a characteristic, can produce electromotive force exactly when oxonium ion moves.If on the contrary electromotive force is added on the zirconia assembly, namely can cause the movement of oxonium ion, can control the ratio value of wanting by control unit of engine according to this principle.
In details of the words, the zirconia element in the sensor plays similar electrolytic solution, and its basic functional principle is, for example high temperature and platinum catalysis under certain condition utilizes the difference in oxygen concentration between of the inside and outside both sides of zirconia, produce potential difference (PD), and concentration difference is larger, and potential difference (PD) is larger.The content of oxygen is 21% in the atmosphere, and the waste gas after the rich mixture burning is in fact oxygen-free, contains more oxygen in the waste gas that generates behind the lean combustion or the waste gas because of scarce fire generation, but still than the oxygen much less in the atmosphere.
Under the catalysis of high temperature and platinum, electronegative oxonium ion is adsorbed on the surfaces externally and internally of zirconia nernst cell.Because the oxygen in the atmosphere is more than the oxygen in the waste gas, communicates a side than the attached more negative ion of waste gas one side draught with atmosphere on the nernst cell, the concentration difference of both sides ion produces electromotive force.When the oxygen concentration of nernst cell waste gas one side hangs down, between electrode, produce a high voltage (0.6～1V), this voltage signal is sent to electronic control unit (ECU, Electronic Control Unit) amplifies processing, ECU regards high voltage signal as rich mixture, and low voltage signal is regarded as lean mixture.According to the voltage signal of lambda sensor, computer is according to diluting near the theoretical optimal air-fuel ratio of 14.7:1 as far as possible or adding rich mixture.Therefore lambda sensor is the key sensor of electronic control fuel metering.Lambda sensor only when high temperature (end reaches 300 ° more than the C) its characteristic just can demonstrate fully, could output voltage.It is when about 800 ° of C, and is the fastest to the reacting condition of combination gas, and this specific character can great changes will take place when low temperature.
The present technical testing scheme of broadband lambda sensor generally is to analyze by reading data flow, and can only carry out the real vehicle test, can't measure the actual performance parameter of broadband lambda sensor.There is following technical matters in prior art: because be the performance of judging the broadband lambda sensor by reading the real vehicle data stream, just diagnostic trouble code and the secondary data of computer memory seen are not the actual parameter of tested sensor.Moreover the broadband lambda sensor will arrive 350 ° just can drop into normal operation more than the C, must wait for the quite a while, and testing efficiency is very low.Descend to some extent when the broadband oxygen sensor performance but not during complete failure, can not produce diagnostic trouble code, therefore, prior art is difficult to accurately judge the performance of broadband lambda sensor.
Yet this sensor is high value consumable accessory, all can affect greatly vehicle performance and toxic emission once lose efficacy, and therefore is necessary to provide a kind of effective experiment test method.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of oxygen sensor performance pick-up unit, it can carry out accurately performance test to broadband lambda sensor or ordinary oxygen sensor.
The present invention also aims to provide a kind of oxygen sensor performance detection method, it can carry out accurately performance test to broadband lambda sensor or ordinary oxygen sensor.
The present invention proposes a kind of oxygen sensor performance pick-up unit, it uses butane gas combustion simulation exhaust pipe of engine operating mode, to being carried out Performance Detection by oxygen sensors, this pick-up unit comprises electronic control unit, circuit of measurement and control and the pump oxygen elementary current test cell that connects successively, and electronic control unit control survey control circuit is to being controlled by the control electric current of oxygen sensors pump oxygen unit; Oxygen sensor signal voltage tester unit, an end are connected in tested oxygen sensor signal output circuit, and other end ground connection is used for being monitored by the zirconia nernst cell output voltage signal of oxygen sensors; The simulated combustion chamber; Temperature sensor, it is indoor to be located at simulated combustion, is used for test by the working temperature of oxygen sensors; The temp .-controlled temperature controller is electrically connected with temperature sensor, is used for control by the working temperature of oxygen sensors; Nozzle, an end is communicated with the simulated combustion chamber, and butane gas enters the simulated combustion chamber by nozzle; And power supply, be electrically connected with electronic control unit, circuit of measurement and control and temp .-controlled temperature controller.
In one embodiment of the invention, described power supply is Switching Power Supply, and its alternating voltage with input is converted to direct current output.
In one embodiment of the invention, described is broadband lambda sensor or ordinary oxygen sensor by oxygen sensors, comprises nernst cell and pump oxygen unit.
In one embodiment of the invention, in testing process, describedly placed simulated combustion indoor by oxygen sensors one end, the other end is connected with pump oxygen elementary current test cell, oxygen sensor signal voltage tester unit and numerical control temperature measurement controller.
In one embodiment of the invention, described pump oxygen elementary current test cell is to being measured by the pump oxygen elementary current signal of oxygen sensors, and the current value control survey control circuit that the electronic control unit foundation measures is to being controlled by the control electric current of oxygen sensors pump oxygen unit.
In one embodiment of the invention, described oxygen sensor signal voltage tester unit is digital voltmeter.
In one embodiment of the invention, the indoor temperature of described temperature sensor senses simulated combustion, with this temperature results and be sent to the temp .-controlled temperature controller, the temp .-controlled temperature controller according to temperature sensor senses to temperature carry out by the measurement of oxygen sensors working temperature and control.
In one embodiment of the invention, be provided with variable valve on the described nozzle, regulate the gas flow by nozzle.
The present invention also provides a kind of oxygen sensor performance detection method, and it comprises step: exhaust pipe of engine Work condition analogue; Monitor by the zirconia nernst cell output voltage signal of oxygen sensors; To being measured by the pump oxygen elementary current signal of oxygen sensors; To being controlled by the control electric current of oxygen sensors pump oxygen unit; And control is by the zirconia nernst cell output voltage of oxygen sensors.
In one embodiment of the invention, described method comprises that further sensing is by the working temperature of oxygen sensors; And according to the step of temperature to being controlled by the working temperature of oxygen sensors that senses.
Lambda sensor pick-up unit of the present invention and method utilize the butane gas burner noz(zle) to carry out exhaust pipe of engine Work condition analogue, adopt digital instrument that the zirconia nernst cell output signal of broadband lambda sensor is measured, utilize simultaneously control circuit that the control electric current of broadband lambda sensor pump oxygen unit is controlled.Have following advantage or beneficial effect: because be to carry out Performance Detection by automobile broadband oxygen sensor performance pick-up unit, what therefore see is the actual parameter of broadband lambda sensor; Because will arriving more than 350 ℃, the broadband lambda sensor just can drop into normal operation, broadband oxygen sensor performance pick-up unit adopts the temp .-controlled temperature controller to carry out the control of broadband lambda sensor working temperature, because the temp .-controlled temperature controller has adopted singlechip technology, therefore the working temperature of lambda sensor can be set arbitrarily in quite wide scope, quite a while need not be waited for, can carry out the batch Performance Detection within a short period of time, testing efficiency is higher; Automobile broadband oxygen sensor performance pick-up unit not only can detect the broadband lambda sensor, and can detect the ordinary oxygen sensor, and utilization factor is high, even can be used as the foundation that whether should change lambda sensor.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the structure block diagram of the lambda sensor pick-up unit of preferred embodiment of the present invention.
Fig. 2 is the process flow diagram of the oxygen sensor performance detection method of preferred embodiment of the present invention.
Fig. 3 is the temperature control flow figure of the oxygen sensor performance detection method of preferred embodiment of the present invention.
Embodiment
As shown in Figure 1, the invention provides a kind of oxygen sensor performance pick-up unit, it can detect automobile broadband lambda sensor or ordinary oxygen sensor.This oxygen sensor performance pick-up unit comprises power supply 101, electronic control unit (ECU, Electronic Control Unit) 102, circuit of measurement and control 103, pump oxygen elementary current test cell 104, oxygen sensor signal voltage tester unit 105, temp .-controlled temperature controller 106, simulated combustion chamber 107, temperature sensor 108, variable valve 109 and nozzle 110.This oxygen sensor performance pick-up unit uses compressed butane gas 111 combustion simulation exhaust pipe of engine operating modes.In the present embodiment, power supply 101 is Switching Power Supply, and its alternating voltage with input is converted to direct current output.Power supply 101 is connected with ECU 102, circuit of measurement and control 103 and temp .-controlled temperature controller 106, to provide working power to ECU 102, circuit of measurement and control 103 and temp .-controlled temperature controller 106 respectively.ECU 102, circuit of measurement and control 103 and pump oxygen elementary current test cell 104 connect successively.Oxygen sensor signal voltage tester unit 105 1 ends are connected in tested oxygen sensor signal output circuit (figure is mark not), and oxygen sensor signal voltage tester unit 105 other end ground connection are used for being monitored by the zirconia nernst cell output voltage signal of oxygen sensors.
In the testing process, placed in the simulated combustion chamber 107 by oxygen sensors 20 1 ends, the other end and pump oxygen elementary current test cell 104, oxygen sensor signal voltage tester unit 105 and numerical control temperature measurement controller 106 are electrically connected.That is, pump oxygen elementary current test cell 104, oxygen sensor signal voltage tester unit 105 and numerical control temperature measurement controller 106 all with by oxygen sensors 20 are connected.
In the present embodiment, be the broadband lambda sensor by oxygen sensors 20, it has nernst cell (figure is mark not) and pump oxygen unit (figure is mark not) two parts.In the testing process, the one side of nernst cell contacts with atmosphere, and another side is positioned at simulated combustion chamber 107, contact by the exhaust that produces after 111 burnings of diffusion hole (not shown) and compressed butane gas, owing to the oxygen content difference of nernst cell both sides produces an electromotive force.Control unit of engine will be consistent the oxygen content of nernst cell both sides, allows magnitude of voltage maintain 0.45V.Pump oxygen unit is exhaust on one side, and another side links to each other with simulated combustion chamber 107.Pump oxygen unit is exactly the principle of reaction of utilizing zirconia sensor, and voltage is put on the zirconia assembly (being pump oxygen unit), can cause like this movement of oxonium ion.Oxygen in the exhaust is pumped in the simulated combustion chamber 107, make the magnitude of voltage of nernst cell both sides maintain 0.45V.If combination gas is too dense, oxygen level descends in the exhaust so, and this moment is more from the oxygen that diffusion hole overflows, and the voltage of nernst cell raises.For reaching the balanced engine control module, increase the control electric current and make pump oxygen unit increase the pump oxygen efficiency, the oxygen content of simulated combustion chamber 107 is increased, the voltage that can regulate like this nernst cell returns to 0.45V; Opposite combination gas is too rare, then the oxygen level in the exhaust increases, and oxygen will enter simulated combustion chamber 107 from diffusion hole here, the nernst cell lower voltage, pump oxygen unit discharged oxygen and came oxygen level in the balance simulation firing chamber 107 this moment, and the voltage that closes nernst cell maintains 0.45V.Generally speaking, the voltage that is added in the pump oxygen unit can guarantee when the oxygen in the simulated combustion chamber 107 is many, the oxygen in the discharge side, and the control stream of control unit of engine is positive current here; When the oxygen in the simulated combustion chamber 107 is few, carry out oxygen supply, this moment, the control electric current of control unit of engine was negative current.The electric current of above process charge pump oxygen unit has just reflected that the surplus air in the exhaust contains coefficient of discharge.
In the present embodiment, the principle of work of oxygen sensor performance pick-up unit is specific as follows: utilize compressed butane gas 111 to enter simulated combustion chamber 107 by nozzle 110 and burn, carry out exhaust pipe of engine Work condition analogue.Adopt the 105 pairs of zirconia nernst cell output voltage signals by oxygen sensors 20 in oxygen sensor signal voltage tester unit to monitor, adopt simultaneously 104 pairs of pump oxygen elementary current signals by oxygen sensors 20 of pump oxygen elementary current test cell to measure, 103 pairs of control electric currents by oxygen sensors 20 pump oxygen units of ECU 102 control survey control circuits are controlled.If combination gas is too dense, oxygen level descends in the exhaust so, and this moment is more from the oxygen that tested sensor 20 diffusion holes overflow, and the voltage of nernst cell raises.For reaching balance, ECU 102 sends the instruction of increase control electric current to circuit of measurement and control 103, makes pump oxygen unit increase the pump oxygen efficiency, and the oxygen content of test chamber 107 is increased, and the voltage that can regulate like this nernst cell reverts to 0.45v; Opposite combination gas is too rare, then the oxygen level in the exhaust increases, at this moment oxygen will enter test chamber from diffusion hole, the nernst cell lower voltage, this moment, ECU 102 sent the instruction of reduction control electric current to circuit of measurement and control 103, make pump oxygen unit discharge oxygen and come oxygen level in the balance test chamber, make the voltage of nernst cell maintain 0.45v.Adopt 104 pairs of current signals by oxygen sensors 20 pump oxygen units of pump oxygen elementary current test cell to measure, simultaneously with oxygen sensor signal voltage tester unit 105 monitoring zirconia nernst cell output signal voltages, its respective change amplitude and reaction velocity have namely embodied by the performance of oxygen sensors 20, thereby reach the purpose that detects lambda sensor.Preferably, oxygen sensor signal voltage tester unit 105 is digital voltmeter.
In addition, in testing process, temperature in the temperature sensor 108 sensing analog firing chambers 107, with this temperature results and be sent to temp .-controlled temperature controller 106, the temperature that temp .-controlled temperature controller 106 senses according to temperature sensor 108 is carried out by measurement and the control of oxygen sensors 20 working temperatures.Temp .-controlled temperature controller 106 is digital temperature control instument, and it adopts singlechip technology, can arrange arbitrarily in quite wide scope by the working temperature of oxygen sensors 20, can also measure by the heating current of oxygen sensors 20 heater coils simultaneously.
The present invention also provides a kind of oxygen sensor performance detection method of utilizing said apparatus, and as shown in Figure 2, it is the process flow diagram of the oxygen sensor performance detection method of preferred embodiment of the present invention.The method comprises the steps: to utilize compressed butane gas 111 to enter simulated combustion chamber 107 by nozzle 110 to burn, carry out exhaust pipe of engine Work condition analogue (step S201).Adopt the 105 pairs of zirconia nernst cell output voltage signals by oxygen sensors 20 in oxygen sensor signal voltage tester unit to monitor (step S202), adopt 104 pairs of pump oxygen elementary current signals by oxygen sensors 20 of pump oxygen elementary current test cell to measure (step S203), 103 pairs of control electric currents by oxygen sensors 20 pump oxygen units of ECU 102 control survey control circuits are controlled (step S204), and then control is by the zirconia nernst cell output voltage (step S205) of oxygen sensors 20.If combination gas is too dense, oxygen level descends in the exhaust so, and this moment is more from the oxygen that tested sensor 20 diffusion holes overflow, and the voltage of nernst cell raises.For reaching balance, ECU 102 sends the instruction of increase control electric current to circuit of measurement and control 103, makes pump oxygen unit increase the pump oxygen efficiency, and the oxygen content of test chamber 107 is increased, and the voltage that can regulate like this nernst cell reverts to 0.45v; Opposite combination gas is too rare, then the oxygen level in the exhaust increases, at this moment oxygen will enter test chamber from diffusion hole, the nernst cell lower voltage, this moment, ECU 102 sent the instruction of reduction control electric current to circuit of measurement and control 103, make pump oxygen unit discharge oxygen and come oxygen level in the balance test chamber, make the voltage of nernst cell maintain 0.45v.Adopt 104 pairs of current signals by oxygen sensors 20 pump oxygen units of pump oxygen elementary current test cell to measure, simultaneously with oxygen sensor signal voltage tester unit 105 monitoring zirconia nernst cell output signal voltages, its respective change amplitude and reaction velocity have namely embodied by the performance of oxygen sensors 20, thereby reach the purpose that detects lambda sensor.Preferably, oxygen sensor signal voltage tester unit 105 is digital voltmeter.
As shown in Figure 3, it is the temperature control flow figure of the oxygen sensor performance detection method of preferred embodiment of the present invention.In testing process, temperature in the temperature sensor 108 sensing analog firing chambers 107, be that sensing is by the working temperature of oxygen sensors 20, and with this temperature results and be sent to temp .-controlled temperature controller 106 (step S301), the temperature that temp .-controlled temperature controller 106 senses according to temperature sensor 108 is carried out by the measurement of oxygen sensors 20 working temperatures and control (step S302).Temp .-controlled temperature controller 106 adopts singlechip technology, can arrange arbitrarily in quite wide scope by the working temperature of oxygen sensors 20, can also measure by the heating current of oxygen sensors 20 heater coils simultaneously.
In sum, lambda sensor pick-up unit of the present invention and method utilize the butane gas burner noz(zle) to carry out exhaust pipe of engine Work condition analogue, adopt digital instrument that the zirconia nernst cell output signal of broadband lambda sensor is measured, utilize simultaneously control circuit that the control electric current of broadband lambda sensor pump oxygen unit is controlled.Have following advantage or beneficial effect: because be to carry out Performance Detection by automobile broadband oxygen sensor performance pick-up unit, what therefore see is the actual parameter of broadband lambda sensor; Because will arriving more than 350 ℃, the broadband lambda sensor just can drop into normal operation, broadband oxygen sensor performance pick-up unit adopts the temp .-controlled temperature controller to carry out the control of broadband lambda sensor working temperature, because the temp .-controlled temperature controller has adopted singlechip technology, therefore the working temperature of lambda sensor can be set arbitrarily in quite wide scope, quite a while need not be waited for, can carry out the batch Performance Detection within a short period of time, testing efficiency is higher; Automobile broadband oxygen sensor performance pick-up unit not only can detect the broadband lambda sensor, and can detect the ordinary oxygen sensor, and the instrument utilization factor is high, even can be used as the foundation that whether should change lambda sensor.
The above, only be embodiments of the invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. oxygen sensor performance pick-up unit, it uses butane gas combustion simulation exhaust pipe of engine operating mode, and to being carried out Performance Detection by oxygen sensors, this pick-up unit comprises:
The electronic control unit, circuit of measurement and control and the pump oxygen elementary current test cell that connect successively, electronic control unit control survey control circuit is to being controlled by the control electric current of oxygen sensors pump oxygen unit;
Oxygen sensor signal voltage tester unit, an end are connected in tested oxygen sensor signal output circuit, and other end ground connection is used for being monitored by the zirconia nernst cell output voltage signal of oxygen sensors;
The simulated combustion chamber;
Temperature sensor, it is indoor to be located at simulated combustion, is used for test by the working temperature of oxygen sensors;
The temp .-controlled temperature controller is connected with temperature sensor, is used for control by the working temperature of oxygen sensors;
Nozzle, an end is communicated with the simulated combustion chamber, and the other end is provided with variable valve, and butane gas enters the burning of simulated combustion chamber by nozzle; And power supply, be connected power supply with electronic control unit, circuit of measurement and control and temp .-controlled temperature controller.
2. oxygen sensor performance pick-up unit according to claim 1 is characterized in that, described power supply is Switching Power Supply, and its alternating voltage with input is converted to direct current output.
3. oxygen sensor performance pick-up unit according to claim 1 is characterized in that, described is broadband lambda sensor or ordinary oxygen sensor by oxygen sensors, comprises nernst cell and pump oxygen unit.
4. oxygen sensor performance pick-up unit according to claim 3, it is characterized in that, in testing process, placed simulated combustion indoor by oxygen sensors one end, the other end is connected with pump oxygen elementary current test cell, oxygen sensor signal voltage tester unit and numerical control temperature measurement controller.
5. oxygen sensor performance pick-up unit according to claim 1, it is characterized in that, described pump oxygen elementary current test cell is to being measured by the pump oxygen elementary current signal of oxygen sensors, and the current value control survey control circuit that the electronic control unit foundation measures is to being controlled by the control electric current of oxygen sensors pump oxygen unit.
6. oxygen sensor performance pick-up unit according to claim 1 is characterized in that, described oxygen sensor signal voltage tester unit is digital voltmeter.
7. oxygen sensor performance pick-up unit according to claim 1, it is characterized in that, the indoor temperature of described temperature sensor senses simulated combustion, with this temperature results and be sent to the temp .-controlled temperature controller, the temp .-controlled temperature controller according to temperature sensor senses to temperature carry out by the measurement of oxygen sensors working temperature and control.
8. oxygen sensor performance pick-up unit according to claim 1 is characterized in that, is provided with variable valve on the described nozzle, regulates the gas flow by nozzle.
9. oxygen sensor performance detection method, it comprises step:
Carry out exhaust pipe of engine Work condition analogue;
To being monitored by the zirconia nernst cell output voltage signal of oxygen sensors;
To being measured by the pump oxygen elementary current signal of oxygen sensors;
To being controlled by the control electric current of oxygen sensors pump oxygen unit; And
Control is by the zirconia nernst cell output voltage of oxygen sensors.
10. oxygen sensor performance detection method according to claim 9, it further comprises:
Sensing is by the working temperature of oxygen sensors; And
The temperature that foundation senses is to being controlled by the working temperature of oxygen sensors.
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| CN103675215A (en) * | 2013-12-24 | 2014-03-26 | 安徽省芜湖仪器仪表研究有限责任公司 | Detection simulation system for vehicle-used oxygen sensor |
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| CN109270151A (en) * | 2018-11-01 | 2019-01-25 | 上海烁范自动化设备有限公司 | Lambda sensor test macro and method |
| CN110333381A (en) * | 2019-06-25 | 2019-10-15 | 河南美力达汽车有限公司 | A kind of Oxygen Sensors for Automobile System of voltage acquisition |
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Application publication date: 20130213 |