CN101236101A - Air flow quantity correcting device - Google Patents
Air flow quantity correcting device Download PDFInfo
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- CN101236101A CN101236101A CNA200810008891XA CN200810008891A CN101236101A CN 101236101 A CN101236101 A CN 101236101A CN A200810008891X A CNA200810008891X A CN A200810008891XA CN 200810008891 A CN200810008891 A CN 200810008891A CN 101236101 A CN101236101 A CN 101236101A
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Abstract
An air flow rate correction equipment for correcting and detecting output signal of air flowmeter for detecting intake flow rate in intake channel, comprising: a rotational speed correcting part B2 for correction actual measured value of engine speed based on sound speed in the air, and a sensor output correcting part B4 for correcting output signal of air flowmeter based on the engine speed corrected by the rotational speed correcting part B2 and the throttle opening.
Description
Technical field
The present invention relates to a kind of air flow quantity correcting device, this equipment calibration is used for the output signal of measured automobiles with the air flowmeter (air flow sensor) of the air inflow of engine control system etc.
Background technology
In the engine for automobile control system, such as variable bar gate type, hot-wire, and various types of air flowmeter of Karman eddy current type can be used for measuring the amount that imports to the air inlet of cylinder (firing chamber) by inlet channel.In particular, use hot wire air flowmeter usually.Hot wire air flowmeter utilizes the cooling effect of air flow.At length, hot wire air flowmeter is equipped with the lead as heater block, and this heater block is heated according to the magnitude of current (amount of energising).Then, current supply amount (result when measuring by being controlled at, the energising amount), lead is heated to stationary temperature and based on representing that with the corresponding lead amount of cooling water of air mass flow the electric signal (output signal) of air mass flow is output, this air mass flow is represented by the current change quantity according to amount of cooling water.
Yet, use these air flowmeter, always whether accurately measure the charge flow rate of engine.The duty that depends on engine, measuring error (air mass flow of being represented by the output signal of air flowmeter and the deviation between the actual air flow) may become very big, and needs to proofread and correct.For example, when very strong pulse takes place in the resonance that flows owing to air inlet, may produce the backflow of air inlet.When actual generation refluxed in air inlet is flowed, it is very big that the measuring error of air flowmeter becomes.The common air flowmeter that comprises hot wire air flowmeter is not considered the direction of air flow and is detected air mass flow.Therefore, even produce air inlet when flowing backwards, to measure air mass flow with the same method of proper flow.The backflow of air inlet has increased the measuring error of air flowmeter.
Usually, the equipment as shown in JP-9-133547A, it has proposed a kind of air flow quantity correcting device, and this equipment is throttle opening by using its parameter, engine speed, and the correction coefficient arteries and veins spectrogram of intake air temperature is proofreaied and correct the output signal of air flowmeter.According to such equipment,, can compensate thus because the measuring error that pulse produces based on the output of the parameter that influences suction pulsation (throttle opening, engine speed, and intake air temperature) correcting sensor.
Because intake air temperature is to the not directly influence of the measured value of air flowmeter in principle, with the parameter relative difficult of intake air temperature as the correction coefficient of the measured value that is used to obtain air flowmeter.Particularly, in the equipment as shown in JP-9-133547A under the situation of intake air temperature as the parameter of correction coefficient arteries and veins spectrogram, need to wait by experiment in advance the relation between the measured value that obtains intake air temperature and air flowmeter, increased working time and the cost of doing correction coefficient arteries and veins spectrogram like this.That is, the said equipment also has problem to be solved.
Summary of the invention
Made the present invention in view of the above problems, and it is a principal object of the present invention to provide a kind of air flow quantity correcting device, this equipment can be proofreaied and correct the measuring error that produces owing to suction pulsation for the output signal of the air flow sensor of measuring charge flow rate in inlet channel.
According to the present invention, the output signal of the air flow sensor of the charge flow rate in the inlet channel of air flow quantity correcting device correcting measuring engine.Charge flow rate is by the air throttle adjustment in the inlet channel that is configured in engine.Calibration equipment comprises sensor output compensator, in order to compensate the caused measuring error of the condition that is limited by the velocity of sound in throttle opening, engine speed and the air inlet, described sensor output compensator is proofreaied and correct the output signal of air flow sensor based on the velocity of sound in engine speed, throttle opening and the air inlet.
The inventor of the said equipment directly is concerned about the velocity of sound as parameter on principle, this velocity of sound works to the measured value of air flow sensor (air flowmeter).The velocity of sound in the air inlet (velocity of sound of air inlet) is equal to the velocity of propagation of suction pulsation, and in measuring air inlet when the velocity of sound and temperature, the velocity of sound has more direct effect than temperature measured value to air flow sensor on principle.Therefore, the measuring error velocity of sound for the make-up air flow sensor is more effective than intake air temperature.According to said structure, described equipment can be proofreaied and correct because the pulse of air inlet produces for the measuring error of measuring the output signal of the air flow sensor of charge flow rate in the inlet channel.
Calibration equipment can also comprise the rotating speed means for correcting of proofreading and correct the actual measured value of engine speed based on the velocity of sound in the air inlet.Sensor output compensator is based on the output signal of proofreading and correct air flow sensor by the engine speed and the throttle opening of rotating speed correction.
The velocity of sound can think to have identical size with the effect of engine speed to the effect of the measured value of air flow sensor.The measuring error that engine speed produces because the measuring error that the velocity of sound produces is converted to, and sensor output compensator is merged into an error with these measuring error and with this error compensation for because the error that engine speed produces.By will owing to the velocity of sound and since the measuring error that engine speed produces merge, under the situation that the correction coefficient public to error derives by the correction coefficient let-off gear(stand) that comprises arteries and veins spectrogram, mathematical formulae etc., reduced the number of the parameter of correction coefficient let-off gear(stand), thereby its size can reduce.Therefore, in the very short cycle, constituted correction coefficient let-off gear(stand) and be easy to guarantee to be used to store the memory area (memory capacity) of correction coefficient let-off gear(stand).
Particularly, actual measured value at engine is represented by Ne1, the corrected value of engine speed is represented by Ne2, the reference value of the velocity of sound in the air inlet is represented by Sp0, and under the currency of the velocity of sound of the air inlet situation about being represented by Sp1, the rotating speed means for correcting is proofreaied and correct the actual measured value of engine speed based on equation: Ne2=Ne1 * (Sp0/Sp1).According to such structure, based on above-mentioned equation, by the measuring error that will produce owing to the velocity of sound with because the measuring error that engine speed produces merges mutually, making derives easily and accurately to two all public correction coefficient of value possibility that becomes.
Calibration equipment can also comprise that correction coefficient let-off gear(stand) and correction coefficient obtain device, described correction coefficient let-off gear(stand) is associated single correction coefficient respectively with a plurality of conditions that limited by throttle opening and engine speed, considered the correction coefficient let-off gear(stand), described correction coefficient obtains device and obtains by engine speed and the unique single correction coefficient that limits of throttle opening by the rotating speed correction.Sensor output compensator is by using the output signal that is obtained the correction coefficient correction air flow sensor of device acquisition by correction coefficient.
Can use any measuring method of the velocity of sound that is used for measuring air inlet.For example, can calculate the velocity of sound by the recurrence interval of detecting from the output signal of air flow sensor.In fact, having the velocity of sound that is used for obtaining the velocity of sound of air inlet based on the temperature in the air inlet, to obtain device be favourable.In common engine control system, provide the sensor that is used to detect intake air temperature.Therefore, by using known sensor to be easy to realize said structure.
According to a further aspect in the invention, air flow quantity correcting device comprises sensor output compensator, for the caused measuring error of condition that the value that compensates by recurrence interval in throttle opening and the air inlet or pulsed frequency limits, described sensor output compensator is proofreaied and correct the output signal of air flow sensor based on the value of throttle opening and recurrence interval or pulsed frequency.
The inventor has noticed the parameter such as recurrence interval and the pulsed frequency and the velocity of sound.Recurrence interval and pulsed frequency and the velocity of sound all have direct effect than temperature to the measured value of air flow sensor.Therefore, for the measuring error of make-up air flow sensor, recurrence interval and pulsed frequency are more effective than intake air temperature.With respect to the output signal that detects the air flow sensor of air inflow in the inlet channel, preferably proofread and correct because the measuring error that suction pulsation produces.
In the said equipment, advantageously, have by the recurrence interval in the predetermined way acquisition air inlet or the pulse parameter let-off gear(stand) of pulsed frequency.Particularly, air flow quantity correcting device can also comprise the pulse parameter let-off gear(stand), and described pulse parameter let-off gear(stand) obtains the value of recurrence interval or pulsed frequency based on the engine speed of the rotating speed of the velocity of sound in the air inlet and expression output shaft.
Replacedly, air flow quantity correcting device can also comprise the pulse parameter let-off gear(stand), and described pulse parameter let-off gear(stand) is used to detect the signal of sensor acquisition recurrence interval of charge flow rate or the value of pulsed frequency based on being configured in the inlet channel.Sensor is intake flow sensor or other sensor except that intake flow sensor.Replacedly, air flow quantity correcting device can also comprise the pulse parameter let-off gear(stand), and described pulse parameter let-off gear(stand) obtains the value of recurrence interval or pulsed frequency based on the output signal that detects the pressure transducer of admission pressure in the inlet channel.Air flow quantity correcting device can be carried out from obtaining the processing of pulse parameter (calculating or estimation recurrence interval or pulsed frequency) to the output calibration of air flow sensor.Can improve the degree of accuracy that obtains pulse parameter.
By utilizing in three kinds of pulse parameter let-off gear(stand)s at least one may obtain pulse parameter (recurrence interval or pulsed frequency).In order to improve degree of accuracy, can be in conjunction with two or more pulse parameter let-off gear(stand)s.For example, can switch two or more pulse parameter let-off gear(stand)s, perhaps can use the mean value of the pulse parameter that obtains by the pulse parameter let-off gear(stand) based on condition.
Calibration equipment can also comprise the rotating speed means for correcting, and described rotating speed means for correcting is proofreaied and correct the actual measured value (for the measured value of the speed probe measurement of engine output shaft configuration) of engine speed based on the recurrence interval in the air inlet or pulsed frequency.Sensor output compensator is based on the output signal of proofreading and correct air flow sensor by the engine speed and the throttle opening of rotating speed correction.Thus, to since the sum of errors that recurrence interval or pulsed frequency produce because under the situation that the public correction coefficient of the error that engine speed produces derives by the correction coefficient let-off gear(stand) that comprises arteries and veins spectrogram, mathematical formulae etc., reduced the number of the parameter of correction coefficient let-off gear(stand), thereby its size can reduce.Therefore, reduced the fabrication cycle of making the correction coefficient let-off gear(stand), and the memory area (memory capacity) that is used to store the correction coefficient let-off gear(stand) is guaranteed at an easy rate.
Can use the sensor of any type with air flow sensor principle.The inventor determines that hot wire air flowmeter has the tendency that produces the measuring error that produces owing to suction pulsation at least.Therefore, especially when air flow sensor is hot wire air flowmeter the present invention especially effective.
Description of drawings
With reference to accompanying drawing, other target of the present invention from following detailed description, it is more apparent that feature and advantage will become, and wherein same parts is represented by identical reference symbol and wherein:
Fig. 1 shows the synoptic diagram of the embodiment of the engine control system of having used the air-flow measurement value correction apparatus;
Fig. 2 shows the block diagram of measured value treatment for correcting;
Fig. 3 shows the process flow diagram of the fuel injection control that comprises treatment for correcting;
Fig. 4 shows the diagram of the correction coefficient arteries and veins spectrogram that is used for treatment for correcting; And
Fig. 5 shows the diagram of correction coefficient arteries and veins spectrogram.
Embodiment
With reference to accompanying drawing, hereinafter will describe embodiment in detail according to air flow quantity correcting device of the present invention.The equipment of present embodiment is applied to has four-wheel car with in the engine control system of reciprocating engine.
With reference to accompanying drawing 1, the schematic structure of engine control system has been described, wherein dispose air flow quantity correcting device.In the present embodiment, use multicylinder engine (for example, in-line four cylinder engine).Among Fig. 1,, show a cylinder in order to make an explanation.
As shown in Figure 1, engine control system comprises the engine (internal combustion engine) 10 that drives bent axle 10d (showing the pulse gear that is configured on the bent axle), various sensors and the ECU (electronic control unit) 50 that is used to control engine 10.
Cylinder head has air intake opening and the exhausr port of opening towards firing chamber 20b.Inlet valve 21 and exhaust valve 22 are driven by the cam (not shown) that is configured on the camshaft that rotates with bent axle 10d respectively.Air intake opening and exhausr port are respectively by inlet valve 21 and exhaust valve 22 opening/closings.Draft tube 30 (inlet manifold) is connected to air intake opening so that air (fresh air) is drawn into each cylinder.Gas outlet 40 (exhaust manifold) is connected to exhausr port and discharges with the gas (exhaust) after will burning.Draft tube 30 disposes pressurizer tank 30a, and in order to limit the interference of suction pulsation and air inlet, the aisle spare of this pressurizer tank is increased.Camshaft disposes variable valve timing apparatus 11,12 and cam-position sensor 11a, 12a respectively.
In the draft tube 30 (inlet channel) of engine 10,, arranged hot wire air flowmeter 32a (air flow sensor) for the air inflow that the air cleaner 31 that detects the upstream portion by being arranged in draft tube 30 sucks.And in order to detect intake air temperature, intake air temperature sensor 32b is arranged in the downstream of air flowmeter 32a.Its aperture is arranged in the downstream of intake air temperature sensor 32b by the throttle sensor 33a of the aperture of the air throttle 33 of DC Motor Control and detection air throttle 33 and displacement.According to the aperture of air throttle 33, adjust the air capacity (air mass flow is adjustable) that imports pressurizer tank 30a.
In the engine 10, thereby lighted combustion fuel by the fuel that thrower 35 sprays.The spark plug 15 that disposes each cylinder of the portfire 15a that comprises ignition coil is installed on the cylinder head of engine 10.Spark plug 15 is at the high pressure of the ignition timing reception of stipulating from ECU50.When receiving high pressure, each spark plug 15 produces spark discharge between its electrode, and thus, the air fuel mixture among the 20b of firing chamber is lighted, thereby based on the reactive combustion fuel of air inlet and fuel.Engine 10 is Otto cycle engine.That is, in the engine 10, carry out by admission stroke pressure stroke, expansion stroke, and a combustion period of out stroke composition in the cycle at 720 ° of CA.
Be used to purify CO, HC, the three-way catalyst 41 of NOx etc. is arranged in the gas outlet 40 (exhaust passage) of engine 10, and (for example be used to detect the air-fuel ratio of exhaust or dense/rare oxygen concentration sensor 41a, linearity test formula NF sensor, diadic detect formula O2 sensor etc.) be arranged in the upstream of catalyzer 41.
In this system, ECU50 carries out engine control and plays air flow quantity correcting device.ECU50 receives from such as the sensor, detects the detection signal of each sensor of the accelerator position sensor 50a etc. of accelerator position.Sensor-based detection signal, ECU50 obtains the drive condition of engine 10 and user's needs, and the actuator of operation such as thrower 35, and engine 10 is worked by rights thus.
ECU50 comprises known microcomputer (not shown).Microcomputer is by the CPU (CPU (central processing unit)) that carries out various calculating, as the RAM (random access memory) of the primary memory of temporary storaging data and result of calculation, as the ROM (ROM (read-only memory)) of program storage, as the EEPROM (rewritable nonvolatile memory) of data-carrier store or backup RAM (receiving from the RAM such as the backup electric power source of vehicle battery), such as A/D converter, and the signal processing unit of clock generation circuit etc., the computing unit such as the I/O mouth, storage unit, signal processing unit and communication unit are formed.ROM storage is used to control various what program of program and control arteries and veins spectrogram engine, that comprise the measured value that is used to proofread and correct air flowmeter 32a.Data-carrier store (EEPROM) storage comprises the various data of the design data of engine 10.
The equipment that illustrates among the air flow quantity correcting device of present embodiment and the JP-9-133547A is proofreaied and correct because the measuring error (especially, the error of increase) that suction pulsation produces for the output signal of measuring the air flowmeter 32a of charge flow rate in the inlet channel.In the present embodiment, obtain correction coefficient as parameter, become easily thereby proofread and correct, preferably operation easily by using the velocity of sound in the air inlet.
With reference to Fig. 2 to 4, hereinafter detailed description is comprised fuel injection control about the measured value treatment for correcting of air flowmeter 32a.Fig. 2 shows the block diagram about the measured value treatment for correcting of air flowmeter 32a, and it is operated by ECU50.Fig. 3 shows the process flow diagram of the fuel injection control processing that comprises treatment for correcting, and Fig. 4 shows the diagram of the correction coefficient arteries and veins spectrogram that is used for treatment for correcting.With reference to Fig. 3, will describe fuel injection control hereinafter in detail and handle.
Carry out processing shown in Figure 3 by the program that execution is stored among the ROM in the crank angle or the official hour cycle of regulation.The parameter value that is used for handling is stored in RAM and EEPROM, or among the backup RAM of ECU50, and then upgrade if desired.
As shown in Figure 3, among the step S11, calculate the current angle of rotation (engine speed Ne1) of bent axle 10d based on the output signal of crank angle sensor 10e.Among the step S12, detect current intake air temperature Tha1 by intake air temperature sensor 32b.
Among the step S13, calculate the velocity of sound in the air inlet, and calculate correction coefficient K1 according to the sound velocimeter that the rotating speed correction coefficient obtains among the part B1 (Fig. 2) based on detected intake air temperature Tha1 in step S12.
Under the situation that the stated reference of intake air temperature is represented by Tha0, the stated reference of the velocity of sound is represented by Sp0 in the air inlet, and current acoustic velocity value (velocity of sound that actual measurement goes out according to intake air temperature Tha1) is represented by Sp1, calculates correction coefficient K1 based on following equation (1)-(3):
Sp0＝331.5+0.6×Tha0 ...(1)
Sp1＝331.5+0.6×Tha1 ...(2)
K1＝Sp0/Sp1 ...(3)
Among the step S14, proofread and correct engine speed Ne1 (by crank angle sensor 10e) thereby acquisition correction engine speed Ne2 with correction coefficient K1.In rotating speed correction portion B2 (Fig. 2), calculate correction engine speed Ne2:Ne2=Ne1 * K1 by using equation subsequently.
Among the step S15, detect the throttle opening Ta of air throttle 33 by throttle sensor 33a.Among the step S16, obtain to be used to proofread and correct the correction coefficient K2 of the output signal of air flowmeter 32a based on detected throttle opening Ta in step S15 and the correction engine speed Ne2 that in step S14, calculates.
At length, obtain the acquisition processing that part B3 (correction coefficient acquisition device) carries out correction coefficient K2 according to the correction coefficient arteries and veins spectrogram (correction coefficient derivation instrument) that forms by experiment in advance in correction coefficient.Fig. 4 shows the diagram of the example of correction coefficient arteries and veins spectrogram.Made correction coefficient arteries and veins spectrogram by the present inventor's actual experiment.
Among Fig. 4, show seven kinds of relations (correcting feature) between correction coefficient K2 (longitudinal axis) and the engine speed Ne (transverse axis) according to throttle opening Ta.As shown in Figure 4, each in seven correction features all has the minimum point of engine speed Ne (in this example, 2000rpm).Minimum point is corresponding with the point of the point calibration amount maximum of the K2=1 that never proofreaies and correct.Become bigger than minimum point according to engine speed Ne, or become littler than minimum point according to engine speed Ne, correction coefficient K2 becomes big (near " K2=1 ").
In these seven kinds of correcting features, relate to the correction coefficient K2 of different sizes for minimum point (2000rpm), the correction coefficient K2 in the gamut of engine speed Ne is corresponding with the value at the correction coefficient K2 at minimum point place.As correction coefficient K2 during less than other correcting feature at minimum point place, correction coefficient K2 is less than other correcting feature in the gamut of engine speed.These seven kinds of correcting features relevant with seven kinds of throttle openings respectively (20 degree, 40 degree, 50 degree, 60 degree, 70 degree, 80 degree, 85 degree in this embodiment).In seven kinds of throttle opening Ta, less aperture is relevant with the characteristic with less correction coefficient K2.That is, for throttle opening Ta, Ta reduces along with aperture, and the correction coefficient K2 relevant with aperture Ta becomes big (approaching " K2=1 ").
As mentioned above, in this arteries and veins spectrogram, the multiple condition that is limited by throttle opening Ta and engine speed Ne2 is relevant with correction coefficient K2 respectively.Among the step S16, with reference to correction coefficient arteries and veins spectrogram, obtain correction coefficient K2, this correction coefficient K2 is limited uniquely by the correction engine speed Ne2 that calculates among detected throttle opening Ta and the step S14 among the step S15.For more detailed, from seven kinds of correcting features, select a correcting feature according to throttle opening Ta.Then, according to the correcting feature of selecting, obtain and the correction corresponding correction coefficient K2 of engine speed Ne2 (transverse axis) (longitudinal axis in the chart).Thereby if very big corresponding value (Ne2 or K2), then the insertion value between adjacent data of on the arteries and veins spectrogram, not existing of the distance between the adjacent data of arteries and veins spectrogram.
Being used in the correction coefficient K2 that obtains among the step S16 derives the correction of the measured value of air flowmeter 32a.That is, among the step S17, obtain the measured value (sensor output value Ga1) of current air flowmeter 32a.Among the step S18, thereby use correction coefficient K2 correcting sensor output valve Ga1 to obtain the sensor output value Ga2 that proofreaies and correct.For in more detail, according to correction calculation: Ga2=Ga1 * K2, sensor output calibration part B4 (sensor output compensator, Fig. 2) calculation correction sensor output value Ga2.
Among the step S19, based on correcting sensor output valve Ga2 (amount of fresh air of representing by value Ga2), calculate fuel injection amount (to open the cycle corresponding with the valve of thrower 35) by this way thus (for example obtain target air-fuel ratio, chemically correct fuel), and then with the fuel injection timing of determining based on the engine driven condition synchronously, carry out fuel by thrower 35 usefulness fuel injection amounts and spray.
As mentioned above,, proofread and correct the output signal of air flowmeter 32a (air flow sensor) by carrying out processing shown in Figure 3 according to present embodiment, thereby and based on the output signal acquisition air inflow acquisition fuel injection amount of proofreading and correct.Therefore, fuel injection amount is accurately controlled.
According to the air flow quantity correcting device of present embodiment, can obtain following advantage.
(1) air flow quantity correcting device of the output signal of the air flowmeter 32a of charge flow rate comprises the program that is used to proofread and correct the output signal of air flowmeter 32a based on the velocity of sound in engine speed, throttle opening and the air inlet in the correcting measuring draft tube 30 (inlet channel), thereby can reduce because the measuring error that causes by the aperture of air throttle 33, for the engine speed of the rotating speed of engine output shaft (bent axle 10d) and condition (engine driven condition) that the velocity of sound in the air inlet limits.For in more detail, described equipment comprises based on the velocity of sound in the air inlet (at length, based on correction coefficient K1 according to the velocity of sound) proofread and correct the program (rotating speed means for correcting, the rotating speed correction portion B2 among Fig. 2) of the actual measured value (by the measured value of crank angle sensor 10e) of engine.Based on the engine speed of being proofreaied and correct by the aperture (throttle opening Ta) of rotating speed correction portion B2 (the engine speed Ne2 of correction) and air throttle 33, sensor output calibration part B4 proofreaies and correct the output signal of air flowmeter 32a.According to such equipment, can merge because the measuring error that the velocity of sound produces and because the measuring error that engine speed produces, thereby the number of parameter that is used to obtain the correction coefficient arteries and veins spectrogram of public correction coefficient can reduce and the size of arteries and veins spectrogram reduces equally.Therefore, reduced the time cycle of making the arteries and veins spectrogram, and the memory area (memory capacity) that is used to store the arteries and veins spectrogram is fixed at an easy rate.
Under the situation about (2) represented by Ne1 in the actual measured value of engine speed, the corrected value of engine speed being represented by Ne2, the reference value of the velocity of sound in the air inlet is represented by Sp0 and the currency of the velocity of sound of air inlet is represented by Sp1, rotating speed correction portion B2 proofreaies and correct the actual measured value of engine speed based on equation: Ne2=Ne1 * (Sp0/Sp1).According to said structure, merged because the measuring error that the velocity of sound produces and because the measuring error that engine speed produces, thereby can easily derive public correction coefficient.
(3) can constitute have respectively with a correction coefficient with by throttle opening Ta with proofread and correct correction coefficient arteries and veins spectrogram (the correction coefficient let-off gear(stand) that a plurality of conditions that engine speed Ne2 limits are associated, Fig. 4), and can constitute and have the program (correction coefficient obtains device, and correction coefficient obtains part B3) that is used to obtain the correction coefficient that correction engine speed Ne2 and throttle opening Ta by reference correction coefficient arteries and veins spectrogram limit uniquely.Sensor output calibration part B4 proofreaies and correct the output signal of air flowmeter 32a by using correction coefficient K2.Therefore, realized said structure at an easy rate and accurately.
(4) can constitute and have a program (velocity of sound obtains device, equation (1)-(3)) thus obtain the velocity of sound based on intake air temperature.Therefore, by using intake air temperature sensor 32b easily to realize said structure.
(5) air flow sensor is hot wire air flowmeter 32a.Therefore, by carrying out processing shown in Figure 3, suitably compensated the measuring error that produces owing to suction pulsation, the measuring error that especially in hot wire air flowmeter, produces.
The foregoing description can be by following change.
Correction coefficient arteries and veins spectrogram shown in Figure 4 is in the example.Correction coefficient arteries and veins spectrogram of the present invention is not limited.In the foregoing description, in order to reduce the size of correction coefficient arteries and veins spectrogram, before the correction coefficient K2 of the output signal that obtains to be used to proofread and correct air flowmeter 32a, obtain compensation because the measuring error that the velocity of sound produces and because the correction coefficient K1 of the measuring error that engine speed produces, the parameter of arteries and veins spectrogram is reduced to the correction engine speed Ne2 based on correction coefficient K1 and throttle opening TA (two-dimentional arteries and veins spectrogram) thus.Replacedly, can use three-dimensional arteries and veins spectrogram, it has three parameters that comprise the velocity of sound, engine speed Ne1 and throttle opening Ta.In this case, do not need to obtain correction coefficient K1.As shown in Figure 5, in the relation between engine speed Ne and correction coefficient K2, when the velocity of sound increases, switch to the high-speed side of engine speed Ne with respect to the minimum point of the correction coefficient K2 of engine speed Ne.By such velocity of sound feature is imported in the chart shown in Figure 4, can form three-dimensional arteries and veins spectrogram.
Usually, hot wire air flowmeter has intake air temperature sensor therein.Substitute above-mentioned intake air temperature sensor 32b, can use the intake air temperature sensor of this embedding.
Can use any method of measuring the velocity of sound in the air inlet.For example, calculate recurrence interval and pulsed frequency, can calculate the velocity of sound thus based on the output signal of air flow sensor.
Substitute the velocity of sound in the air inlet, can use the recurrence interval or the pulsed frequency of air inlet.In this case, in the step S12 of Fig. 3, obtain the recurrence interval or the pulsed frequency of air inlet, and in step S13, calculate correction coefficient K1 based on recurrence interval or pulsed frequency (for example, based on the deviation of reference value).Such structure has obtained and the identical advantage of above-mentioned advantage (1).
The program of using rotating speed based on the velocity of sound in the air inlet (being calculated by equation (2)) and engine output shaft (engine speed that calculates based on the sensor output of crank angle sensor 10e) to be used for obtaining recurrence interval of air inlet or pulsed frequency effectively is used to obtain the program (pulse parameter let-off gear(stand)) of recurrence interval or pulsed frequency as step 12.For in more detail, (be stored among the ROM by the arteries and veins spectrogram that uses regulation, or formula) obtains pulse parameter (recurrence interval or pulsed frequency), write the recurrence interval that is used for the velocity of sound or engine speed or the appropriate value of pulsed frequency on the arteries and veins spectrogram of this regulation.
Replacedly, be used for calculating the program of recurrence interval or pulsed frequency effectively from output signal (signal output waveform) by the output signal (or the additive air flowmeter in the draft tube 30) that obtains air flowmeter 32a continuously.With respect to absolute value in the output of air flowmeter 32a, the deviation of output does not have big interference.Therefore,, in other words, use the sensor output before proofreading and correct, can go out the recurrence interval and the pulsed frequency of air inlet with high precision computation even use the output of air flowmeter 32a.
Replacedly, the pressure transducer that detects admission pressure is configured near intake air temperature sensor in the draft tube 30 (inlet channel), thereby and the output signal that obtains pressure transducer continuously calculate recurrence interval or pulsed frequency.
According to said procedure (pulse parameter let-off gear(stand)), can obtain pulse parameter (recurrence interval or pulsed frequency) with high precision.For the degree of accuracy (estimating degree of accuracy and counting accuracy) of improving pulse parameter, can be in conjunction with aforesaid any two programs or three programs.According to condition, can switch to another program in the program of using.Can use the mean value of the pulse parameter that obtains by two or more programs.
Air flow sensor is not limited to hot wire air flowmeter.Can use variable baffle-type air flowmeter and Karman eddy current type air flowmeter.
Can change the type (direct fuel-injection engine or diesel engine) and the system construction of engine.
In the foregoing description and the modification, use various softwares (program).Replacedly, can use such as the hardware of circuit to obtain identical functions.
Claims (11)
1. air flow quantity correcting device, the output signal of the air flow sensor of the charge flow rate in the inlet channel of described equipment calibration detection of engine, the torque actuated output shaft that described engine produces by the burning that imports to air inlet in the inlet channel and fuel, dispose the air throttle of adjusting charge flow rate according to the aperture of air throttle in described inlet channel, described equipment comprises:
Sensor output compensator, in order to compensate by throttle opening, the engine speed of rotating speed of expression output shaft and the caused measuring error of condition that the velocity of sound in the air inlet limits, described sensor output compensator is based on the output signal of the correction of the velocity of sound in engine speed, throttle opening and air inlet air flow sensor.
2. air flow quantity correcting device according to claim 1 is characterized in that, also comprises:
The rotating speed means for correcting, the actual measured value that described rotating speed means for correcting is proofreaied and correct engine speed based on the velocity of sound in the air inlet, wherein
Sensor output compensator is based on the output signal of proofreading and correct air flow sensor by the engine speed and the throttle opening of rotating speed correction.
3. air flow quantity correcting device according to claim 2 is characterized in that,
Actual measured value at engine speed is represented by Ne1, the corrected value of engine speed is represented by Ne2, the reference value of the velocity of sound in the air inlet is represented by Sp0, and under the currency of the velocity of sound of the air inlet situation about being represented by Sp1, the rotating speed means for correcting is proofreaied and correct the actual measured value of engine speed based on equation: Ne2=Ne1 * (Sp0/Sp1).
4. air flow quantity correcting device according to claim 2 is characterized in that, also comprises:
Correction coefficient let-off gear(stand), described correction coefficient let-off gear(stand) are associated single correction coefficient respectively with a plurality of conditions that limited by throttle opening and correction engine speed; And
Correction coefficient obtains device, considers the correction coefficient let-off gear(stand), and described correction coefficient obtains the single correction coefficient that the device acquisition is limited uniquely by engine speed and throttle opening by the rotating speed correction, wherein
Sensor output compensator is by using the output signal that is obtained the correction coefficient correction air flow sensor of device acquisition by correction coefficient.
5. air flow quantity correcting device according to claim 1 is characterized in that, also comprises:
The velocity of sound that is used for obtaining the velocity of sound of air inlet obtains device.
6. air flow quantity correcting device, the output signal of the air flow sensor of the charge flow rate in the inlet channel of described equipment calibration detection of engine, the torque actuated output shaft that described engine produces by the burning that imports to air inlet in the inlet channel and fuel, dispose the air throttle of adjusting charge flow rate according to the aperture of air throttle in described inlet channel, described equipment comprises:
Sensor output compensator, the measuring error that condition produced that limits in order to compensate because by the value of recurrence interval or pulsed frequency in throttle opening, the air inlet, described sensor output compensator are proofreaied and correct the output signal of air flow sensor based on the value of the aperture of air throttle and recurrence interval or pulsed frequency.
7. air flow quantity correcting device according to claim 6 is characterized in that, also comprises:
Pulse parameter let-off gear(stand), described pulse parameter let-off gear(stand) obtain the value of recurrence interval or pulsed frequency based on the engine speed of the rotating speed of the velocity of sound in the air inlet and expression output shaft.
8. air flow quantity correcting device according to claim 6 is characterized in that, also comprises:
The pulse parameter let-off gear(stand), described pulse parameter let-off gear(stand) is used to detect the signal of sensor acquisition recurrence interval of charge flow rate or the value of pulsed frequency based on being configured in the inlet channel, wherein
Sensor is intake flow sensor or other sensor except that intake flow sensor.
9. air flow quantity correcting device according to claim 6 is characterized in that, also comprises:
Pulse parameter let-off gear(stand), described pulse parameter let-off gear(stand) obtain the value of recurrence interval or pulsed frequency based on the output signal that detects the pressure transducer of admission pressure in the inlet channel.
10. air flow quantity correcting device according to claim 6 is characterized in that, also comprises:
The rotating speed means for correcting, the actual measured value that described rotating speed means for correcting is proofreaied and correct engine speed based on the value of recurrence interval in the air inlet or pulsed frequency, wherein
Sensor output compensator is based on the output signal of proofreading and correct air flow sensor by the engine speed and the throttle opening of rotating speed correction.
11., it is characterized in that air flow sensor is a hot wire air flowmeter according to claim 1 or 6 described air flow quantity correcting devices.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007020332A JP2008184987A (en) | 2007-01-31 | 2007-01-31 | Device for correcting air flow rate measurement value |
| JP020332/2007 | 2007-01-31 |
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| CN101236101A true CN101236101A (en) | 2008-08-06 |
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| CNA200810008891XA Pending CN101236101A (en) | 2007-01-31 | 2008-01-30 | Air flow quantity correcting device |
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| JP3496952B2 (en) * | 1993-01-04 | 2004-02-16 | 株式会社日立製作所 | Engine control device |
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