CN1712921A - Device and method for generating analog worsensing signals for sensor - Google Patents
Device and method for generating analog worsensing signals for sensor Download PDFInfo
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- CN1712921A CN1712921A CN 200410048173 CN200410048173A CN1712921A CN 1712921 A CN1712921 A CN 1712921A CN 200410048173 CN200410048173 CN 200410048173 CN 200410048173 A CN200410048173 A CN 200410048173A CN 1712921 A CN1712921 A CN 1712921A
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Abstract
A method for simulating generation of deterioration signal includes selecting filter with time constant corresponding to required deterioration degree from multiple low pass filters as per required deterioration degree, generating transitional response delay corresponding to required deterioration degree by passing detection signal of air - fuel ratio transducer through selected filter. The device of the method is also disclosed.
Description
Technical field
The present invention relates to a kind of simulation deterioration signal generation device and method of simulating the detection signal of the sensor that produces the operating condition be used to detect internal combustion engine when deterioration occurring.
Background technology
Known in the past air-fuel ratio control device has the air-fuel ratio sensor that detects the air-fuel ratio of the mixed gas of burning according to the oxygen concentration in the I. C. engine exhaust, according to the air-fuel ratio that detects by described air-fuel ratio sensor and the deviation of target air-fuel ratio, the fuel quantity of FEEDBACK CONTROL IC engine supply.
In addition, the spy opens flat 08-128347 communique and discloses a kind of air-fuel ratio control device, detects the variation of the indicial response characteristic that the deterioration because of described air-fuel ratio sensor causes, and changes described target air-fuel ratio according to the variation of described indicial response characteristic.
, the control specification when air-fuel ratio sensor is produced deterioration is set at optimum value, need use that the air-fuel ratio sensor of deterioration carries out FEEDBACK CONTROL, and the deterioration state of control specification and sensor is complementary.
Therefore, make the air-fuel ratio sensor of the output characteristics under the expression deterioration state in the past, the air-fuel ratio sensor of representing the output characteristics of this deterioration state was installed on the internal combustion engine, carried out described coupling operation.
But the problem of existence is that the air-fuel ratio sensor of making the output characteristics of expression deterioration state as requested is very difficult, and can cause the manufacturing cost of air-fuel ratio sensor to rise.
And, the air-fuel ratio sensor of the output characteristics of expression deterioration state is being installed in the process that experimentizes on the internal combustion engine, the further deterioration of air-fuel ratio sensor is difficult to mate operation according to certain deterioration condition.
Summary of the invention
The objective of the invention is, provide a kind of can the simulation to produce the simulation deterioration signal generation device and the method for sensor of deterioration state that air-fuel ratio sensor etc. detects the sensor of internal combustion engine operation state, can carry out the coupling operation of control specification of the deterioration state of respective sensor low-cost, accurately.
In order to achieve the above object, the simulation deterioration signal generation device of sensor of the present invention constitutes, indicial response with the detection signal that makes sensor produces the delay system that postpones, degradation as requested changes the transient characteristic of described delay system, and the output of described delay system is exported as the simulation deterioration signal of described sensor.
The other objects and features of the invention will be clearer and more definite by the following explanation of doing with reference to accompanying drawing.
Description of drawings
Fig. 1 is system's pie graph of the internal combustion engine of embodiment.
Fig. 2 is the structural drawing of the air-fuel ratio sensor of embodiment.
Fig. 3 is the figure that the air-fuel ratio of the air-fuel ratio sensor of explanation embodiment detects principle.
Fig. 4 is the process flow diagram of the 1st embodiment of the generation control of expression simulation deterioration signal.
Fig. 5 is illustrated in the circuit diagram that described the 1st embodiment carries out the selection of low-pass filter.
Fig. 6 is the process flow diagram that expression simulation deterioration signal produces the 2nd embodiment of control.
Embodiment
Fig. 1 is system's pie graph that the internal combustion engine of simulation deterioration signal generation device of the present invention is used in expression.
In Fig. 1, in the draft tube 12 of internal combustion engine 11, be provided with the air flowmeter 13 of measuring intake air flow Qa and the intake-air throttle valve 14 of controlling intake air flow Qa.
Air inlet shunt in described intake-air throttle valve 14 downstreams is provided with electro-magneto fuel injector 15 at each cylinder.
Described Fuelinjection nozzle 15 sprays the fuel that is adjusted to authorised pressure according to opening valve from the drive pulse signal of control module 50 outputs.
And, be provided with the cooling-water temperature sensor 16 of the cooling water temperature Tw in the cooling jacket that detects internal combustion engine 11.
On the other hand, be provided with air-fuel ratio sensor 18,, detect the air-fuel ratio in the firing chamber of internal combustion engine according to the oxygen concentration in the exhaust in the set portion of bypassing exhaust device 17.
In the downstream of described air-fuel ratio sensor 18, the also unit that the oxidation of carrying out CO, HC and NOx are installed is with the three-way catalyst 19 of purifying exhaust gas.
Below, the structure of described air-fuel ratio sensor 18 and the detection principle of air-fuel ratio are described.
Fig. 2 represents the structure of described air-fuel ratio sensor 18.
The main body 1 of described air-fuel ratio sensor 18 is for example by the zirconia Zr with oxygen-ion conductive
2O
3Form etc. thermotolerance porous matter insulating material.
In described main body 1 well heater 2 is set.
And, in described main body 1 atmosphere entrance hole 3 and the gas entrance hole 4 that is communicated with atmosphere (calibrating gas) is set, and passes through the gas diffusion layers 6 that protective seam 5 is communicated with the I. C. engine exhaust side.
Detecting electrode 7A, 7B are provided with facing to atmosphere entrance hole 3 and gas diffusion layers 6, and pump electrode 8A, 8B be located at gas diffusion layers 6 and the main body 1 corresponding with it around.
The voltage that the oxygen ion concentration (oxygen partial pressure) between described detecting electrode 7A, 7B in generation and the gas diffusion layers 6 and the ratio of the oxygen ion concentration in the atmosphere adapt is according to the deep or light degree of the air-fuel ratio relative theory air-fuel ratio in this voltage detecting gas diffusion layers 6.
On the other hand, apply the voltage that results between detecting electrode 7A, the 7B, promptly apply voltage according to the deep or light degree in the gas diffusion layers 6 to pump electrode 8A, 8B.
To described pump electrode 8A, when 8B applies predetermined voltage, correspondingly the oxonium ions in the gas diffusion layers 6 move, and flow through electric current between pump electrode 8A, 8B.
Herein, current value (boundary electric current) Ip that flows through when applying predetermined voltage between pump electrode 8A, 8B between this electrode is influenced by the oxygen ion concentration in the exhaust, so can detect air-fuel ratio by detecting current value (boundary electric current) Ip.
Promptly, shown in the table (A) of Fig. 3, can obtain the current/voltage between pump electrode 8A, the 8B and the correlationship of air-fuel ratio, deep or light output according to detecting electrode 7A, 7B, make the voltage of relative pump electrode 8A, 8B apply the direction counter-rotating, in dense zone and light regional both sides' air-fuel ratio zone, current value (boundary electric current) Ip according to flowing through between pump electrode 8A, the 8B can detect air-fuel ratio thus.
Detect principle according to above-described air-fuel ratio, the interelectrode current value I p of testing pump for example with reference to the table (B) of Fig. 3, can detect air-fuel ratio in wide scope.
But, be not that the structure of air-fuel ratio sensor 18 and the detection principle of air-fuel ratio are defined as above-mentioned situation, as described air-fuel ratio sensor 18, also can use the deep or light so-called chemical sensor that detects the relative theory air-fuel ratio.
Turn back to the explanation of described Fig. 1 herein.
Be provided with the CKP 20 that detects crank angle degree at described internal combustion engine 11.
At described control module 50, according to calculating internal combustion engine rotational speed Ne from the signal of described CKP 20 outputs.
Described control module 50 comprises the microcomputer that is made of CPU, ROM, RAM, A/D converter and IO interface, from described air-fuel ratio sensor 18, air flowmeter 13, cooling-water temperature sensor 16, CKP 20 input detection signals.
And control module 50 is according to described detection signal, according to the fuel injection amount of following described control Fuelinjection nozzle 15.
Described control module 50 is according to intake air flow Qa that is detected by air flowmeter 13 and the internal combustion engine rotational speed Ne that obtains from the signal of CKP 20, the basic fuel injection pulse width Tp=k of computing * Qa/Ne (k is a constant).
And described control module 50 computings are forced air-fuel ratio to be corrected to the target equivalent proportion Z of incremental correction COEFFICIENT K as, air fuel ratio feedback correction coefficient LAMBDA after water temperature correction COEFFICIENT K w, starting and the starting of dense side, voltage correction composition Ts, corresponding target air-fuel ratio when low water temperature.
Then, described control module 50 computing final fuel injection pulse width Ti,
Ti＝Tp×(1+Kw+Kas+…)×LAMBDA×Z+Ts
Herein, the drive pulse signal of described fuel injection pulse width Ti is exported to described Fuelinjection nozzle 15, from described Fuelinjection nozzle 15 ejection quantity and the proportional fuel of removing from described fuel injection pulse width Ti behind the voltage correction composition Ts of effective injection pulse width Te.
Above-mentioned air fuel ratio feedback correction coefficient LAMBDA is according to the deviation of the actual mixing ratio of air-fuel ratio sensor 18 detections and target air-fuel ratio and the correction coefficient of computing, by utilizing this air fuel ratio feedback correction coefficient LAMBDA to proofread and correct basic fuel pulse width Tp, make actual air-fuel ratio consistent with target air-fuel ratio.
Described air fuel ratio feedback correction coefficient LAMBDA is by based on the proportional-differential ferential action of the deviation of actual mixing ratio that is detected by air-fuel ratio sensor 18 and target air-fuel ratio and computing.
, be built-in with simulation deterioration signal generation device of the present invention herein, this simulation deterioration signal generation device is worked at described control module 50.
Promptly, can carry out the switching of following state, directly the detection signal of the described air-fuel ratio sensor 18 of use carries out the state of common air-fuel ratio feedback control, and owing to when development and Design control specification, make the needs of the operation that various controlled variables are complementary, at the simulation deterioration signal generation device detection signal of described air-fuel ratio sensor 18 is handled, carried out the state of air-fuel ratio feedback control.
In addition, when the simulation deterioration signal that makes air-fuel ratio sensor 18 produces, can be from the outside to control module 50 indication degradation requirements.
In addition, described degradation for example can utilize to be equivalent to operating range 100,000 km, to be equivalent to vehicle operating ranges such as operating range 200,000 km and to specify.
And, make vehicle that the air-fuel ratio sensor 18 of simulation deterioration signal generation device when working be actually market sale with new air-fuel ratio sensor, do not use the air-fuel ratio sensor of the output characteristics that shows deterioration state.
The contents processing of the described simulation deterioration signal generation device of the flowcharting of Fig. 4.
At first,, judge whether to produce the requirement of simulation deterioration signal, when having generation to simulate requiring of deterioration signal, change step S2 at step S1.
At step S2, the degradation of reading requirement is for example wanted the requirement of the operating range of simulating.
At step S3, select the low-pass filter LPF (analog delay circuit) of time constant of the degradation of corresponding described requirement.
In the present embodiment, as shown in Figure 5, constitute the mutually different a plurality of low-pass filter LPF of relative time constant (time lag of first order key element) and can optionally import the detection signal of air-fuel ratio sensor 18, at described step S3, select to make the low-pass filter LPF of the detection signal of handling air-fuel ratio sensor 18 according to the degradation of described requirement.
In addition, described low-pass filter LPF is made of capacitance resistance, according to the difference of resistance value capacitance, determines time constant respectively.
At step S4, utilize the detection signal of the low-pass filter LPF processing air-fuel ratio sensor 18 of described selection, produce the detection signal (simulation deterioration signal) that makes the generation of forced excessive delay corresponding thus with the degradation of requirement.
Step S5 in the back, the detection signal (simulation deterioration signal) according to by described low-pass filter LPF carries out air-fuel ratio feedback control.
Thus, use new air-fuel ratio sensor 18, the air-fuel ratio feedback control state when deterioration appears in simulation air-fuel ratio sensor 18.
And,, considered the coupling of the various parameters of deterioration state according to the internal combustion engine operation state (venting quality etc.) of this moment.
As mentioned above, if adopt the structure of the detection signal simulation ground deterioration that makes new air-fuel ratio sensor 18, do not need to make the air-fuel ratio sensor of the output characteristics under the expression deterioration state, the air-fuel ratio that can carry out response degradation as requested where necessary detects, can be low-cost and corresponding coupling operation when carrying out deterioration state occurring with air-fuel ratio sensor accurately.
In addition, in the above-described embodiments, be the switching that utilizes software control low-pass filter LPF, but also can make the change-over switch double as of low-pass filter LPF require the assigned switch of degradation, by specifying the operation that requires degradation, carry out the selection of low-pass filter LPF simultaneously.
And, also built-in simulation deterioration signal generation device in control module 50 not, and the simulation deterioration signal generation device is installed between air-fuel ratio sensor 18 and control module 50 in addition.
In addition, in the above-described embodiments, the detection signal of air-fuel ratio sensor 18 is handled in utilization as the low-pass filter LPF of analog delay circuit, the excessive delay that generation of forced is corresponding with requiring degradation, but also can come generation of forced excessive delay (time lag of first order) by calculation process such as weighted means.
The flowcharting of Fig. 6 makes the detection signal of air-fuel ratio sensor 18 produce the 2nd embodiment of excessive delay (time lag of first order) by calculation process.
In the process flow diagram of Fig. 6, at step S11, judge whether the requirement that produces the simulation deterioration signal is arranged, when having generation to simulate requiring of deterioration signal, change step S12 over to.
At step S12, the degradation of reading requirement is for example wanted the requirement of the operating range of simulating.
At step S13, set the weighting constant k (time constant of weighted mean computing) corresponding with the degradation of described requirement.
Described weighting constant k is stored as tables of data in advance according to the degradation (operating range) of each requirement.
At step S14, use described weighting constant k that the detection signal of air-fuel ratio sensor 18 is weighted on average, produce the detection signal (simulation deterioration signal) that makes the generation of forced excessive delay corresponding thus with the degradation of requirement.
The weighted mean value of the detection signal of weighted mean value=k * up-to-date+(1-k) * last time
But, be used to make the calculation process of generation of forced excessive delay (time lag of first order) to be not limited to the weighted mean computing.
At step S15, carry out air-fuel ratio feedback control according to described weighted mean value (simulation deterioration signal).
According to said structure, can make by software processes and produce the simulation deterioration signal, thus can avoid rising because of appending the cost that hardware causes, and, append as the function of simulating deterioration signal generation device to control module 50 easily.
In addition, the sensor that produces the simulation deterioration signal is not limited to air-fuel ratio sensor 18, and the sensor that changes so long as indicial response changed along with the time can be suitable for simulation deterioration signal generation device of the present invention equally.
Claims (15)
1. the simulation deterioration signal generation device of a sensor, this sensor is used to detect the operating condition of internal combustion engine, it is characterized in that, comprising:
Import the detection signal of described sensor, make the indicial response of described detection signal produce the delay system that postpones;
Set the degradation configuration part of the degradation that requires; With
Change the transient characteristic changing unit of the transient characteristic of described delay system according to the degradation of described requirement,
The simulation deterioration signal output of the output of described delay system as described sensor.
2. the simulation deterioration signal generation device of sensor according to claim 1 is characterized in that, described transient characteristic changing unit is set the time constant of described delay system according to the degradation of described requirement.
3. the simulation deterioration signal generation device of sensor according to claim 1 is characterized in that, described delay system comprises the mutually different a plurality of analog delay circuits of time constant,
Described transient characteristic changing unit is selected the analog delay circuit of the detection signal of the described sensor of input according to the degradation of described requirement.
4. the simulation deterioration signal generation device of sensor according to claim 1 is characterized in that, described delay system is that the detection signal to described sensor is weighted average arithmetical unit,
Described transient characteristic changing unit changes described average weighted weighting constant according to the degradation of described requirement.
5. the simulation deterioration signal generation device of sensor according to claim 1 is characterized in that, the degradation that requires is set according to the operating range of the vehicle that described internal combustion engine has been installed in described degradation configuration part.
6. the simulation deterioration signal generation device of sensor according to claim 1 is characterized in that, described sensor is the air-fuel ratio sensor that detects the air-fuel ratio of described internal combustion engine according to the constituent concentration in the exhaust of described internal combustion engine.
7. the simulation deterioration signal generation device of sensor according to claim 6, it is characterized in that, comprising the simulation deterioration signal according to the described sensor of exporting from described delay system, is the air-fuel ratio feedback control of described internal combustion engine the FEEDBACK CONTROL portion of target air-fuel ratio.
8. the simulation deterioration signal generation device of a sensor, this sensor is used to detect the operating condition of internal combustion engine, it is characterized in that, comprising:
Import the detection signal of described sensor, make the indicial response of described detection signal produce the delay cell that postpones;
Set the degradation setup unit of the degradation that requires; With
Change the transient characteristic change unit of the transient characteristic of described delay system according to the degradation of described requirement,
The simulation deterioration signal output of the output of described delay cell as described sensor.
9. the simulation deterioration signal production method of a sensor, this sensor is used to detect the operating condition of internal combustion engine, it is characterized in that, may further comprise the steps:
Set the degradation that requires,
According to the transient characteristic of the degradation of described requirement change delay system,
Import the detection signal of described sensor to described delay system,
The output of described delay system is exported as the simulation deterioration signal.
10. the simulation deterioration signal production method of sensor according to claim 9 is characterized in that, in the step of the described transient characteristic of change, sets the time constant of described delay system according to the degradation of described requirement.
11. the simulation deterioration signal production method of sensor according to claim 9 is characterized in that, described delay system comprises the mutually different a plurality of analog delay circuits of time constant,
In the step of the described transient characteristic of change, select the analog delay circuit of the detection signal of the described sensor of input according to the degradation of described requirement.
12. the simulation deterioration signal production method of sensor according to claim 9 is characterized in that, described delay system is that the detection signal to described sensor is weighted average arithmetical unit,
In the step of the described transient characteristic of change, change described average weighted weighting constant according to the degradation of described requirement.
13. the simulation deterioration signal production method of sensor according to claim 9 is characterized in that, in the step of the degradation of setting described requirement, sets the degradation that requires according to the operating range of the vehicle that described internal combustion engine has been installed.
14. the simulation deterioration signal production method of sensor according to claim 9 is characterized in that, described sensor is the air-fuel ratio sensor that detects the air-fuel ratio of described internal combustion engine according to the constituent concentration in the exhaust of described internal combustion engine.
15. the simulation deterioration signal production method of sensor according to claim 14, it is characterized in that, further comprising the steps of, according to the simulation deterioration signal of the described sensor of exporting from described delay system, be the air-fuel ratio feedback control of described internal combustion engine target air-fuel ratio.
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| CN 200410048173 CN1712921A (en) | 2004-06-21 | 2004-06-21 | Device and method for generating analog worsensing signals for sensor |
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| CN 200410048173 CN1712921A (en) | 2004-06-21 | 2004-06-21 | Device and method for generating analog worsensing signals for sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777274A (en) * | 2011-05-13 | 2012-11-14 | 北汽福田汽车股份有限公司 | Transition control method of engine controller |
| EP1860305B1 (en) * | 2006-05-24 | 2019-03-06 | Ngk Spark Plug Co., Ltd. | Deterioration signal generation device for gas sensor |
-
2004
- 2004-06-21 CN CN 200410048173 patent/CN1712921A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1860305B1 (en) * | 2006-05-24 | 2019-03-06 | Ngk Spark Plug Co., Ltd. | Deterioration signal generation device for gas sensor |
| CN102777274A (en) * | 2011-05-13 | 2012-11-14 | 北汽福田汽车股份有限公司 | Transition control method of engine controller |
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