CN113279869A - Method for correcting engine intake flow sensor on vehicle - Google Patents
Method for correcting engine intake flow sensor on vehicle Download PDFInfo
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- CN113279869A CN113279869A CN202010102028.1A CN202010102028A CN113279869A CN 113279869 A CN113279869 A CN 113279869A CN 202010102028 A CN202010102028 A CN 202010102028A CN 113279869 A CN113279869 A CN 113279869A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
Abstract
The present application provides a method of modifying an engine intake air flow sensor on a vehicle. The method comprises the following steps: closing an exhaust gas recirculation valve; operating the engine from low-speed low-load to high-speed high-load, thereby covering the whole range of the intake air flow; correcting the first corresponding relation between the existing flow sensor signal and the induction intake flow according to a planning solution to form a corrected second corresponding relation; feeding back the second corresponding relation to the engine control module; wherein the engine is fixed in an engine mounting position on the vehicle. The method does not need a special rack and special equipment, is favorable for saving time and labor force, and is also favorable for correcting the air inlet flow sensor of the engine arranged on the vehicle at any time, thereby being favorable for ensuring the normal operation of the engine.
Description
Technical Field
The invention relates to the technical field of vehicle engines, in particular to a method for correcting an engine intake flow sensor on a vehicle.
Background
An engine intake air flow sensor, also called an air flow meter, is widely used in vehicle engines. The engine intake air flow sensor measures the air flow inhaled by the engine, converts the measurement result into an electric signal and transmits the electric signal to the engine control module. The engine control module calculates the fuel injection quantity of the engine according to the measurement result of the air intake flow sensor of the engine, so that the engine reaches the optimal air-fuel ratio and the normal operation of the engine is ensured. Therefore, the engine has a high demand for the measurement accuracy of the engine intake air flow sensor.
The prior art requires the use of a dedicated stand and dedicated equipment to correct the engine intake air flow sensor. Specifically, the engine intake flow sensor is first placed on a dedicated stand, and then the gas flow rate passing through the engine intake flow sensor is changed by a dedicated device, so that the engine intake flow sensor can be corrected.
Therefore, it takes time and effort to modify the engine intake air flow sensor using the prior art. And because a special stand and special equipment are needed, the requirement on the working environment is high, and the air intake flow sensor of the engine cannot be corrected at any time.
Disclosure of Invention
In view of the above-described problems in the prior art, the present application proposes a method of correcting an engine intake air flow sensor on a vehicle. The method does not need a special rack and special equipment, is favorable for saving time and labor force, and is also favorable for correcting the air inlet flow sensor of the engine arranged on the vehicle at any time, thereby being favorable for ensuring the normal operation of the engine.
The invention provides a method for correcting an engine intake air flow sensor on a vehicle, which comprises the following steps: closing an exhaust gas recirculation valve; operating the engine from low-speed low-load to high-speed high-load, thereby covering the whole range of the intake air flow; correcting the first corresponding relation between the existing flow sensor signal and the induction intake flow according to a planning solution to form a corrected second corresponding relation; wherein the flow sensor signal is collected by the intake flow sensor; feeding back the second corresponding relation to an engine control module; wherein the engine is fixed at an engine mounting location on the vehicle. The method can correct the engine intake flow sensor when the engine is fixed at the engine mounting position on the vehicle, does not need a special rack and special equipment, is beneficial to saving time and labor force, and is also beneficial to correcting the engine intake flow sensor mounted on the vehicle at any time, thereby being beneficial to ensuring the normal operation of the engine.
In one embodiment, modifying the existing first correspondence of the flow sensor signal to the induced intake air flow according to the planning solver to form the modified second correspondence comprises: the engine control module acquires the induction intake air flow rate according to the flow sensor signal by utilizing the first corresponding relation; the engine control module acquires a simulated intake air flow according to a third corresponding relation between the intake pressure and the intake temperature acquired by the intake pressure and temperature sensor, wherein the third corresponding relation is used for representing an algorithm among the intake pressure, the intake temperature and the simulated intake air flow; calculating the difference value between the induction air inflow and the corresponding simulated air inflow, summing the difference values and taking the absolute value of the sum to obtain the absolute value of the sum; the second correspondence is obtained such that the absolute value of the sum is minimized. Through the embodiment, the planning solution calculation method is simple and accurate, so that the second corresponding relation can be acquired in a time-saving and labor-saving manner, and the accuracy of the corrected second corresponding relation is ensured, so that the induced intake air flow is consistent with the simulated intake air flow.
In one embodiment, the engine control module prestores the third correspondence relationship. By this embodiment, it is advantageous to increase the correction rate.
In one embodiment, the intake air flow sensor is located in an intake hose at the front end of the engine supercharger.
In one embodiment, the intake pressure temperature sensor is located in a rigid intake manifold at the rear end of the intercooler. By the embodiment, due to the internal environment stability of the rigid intake manifold, the intake pressure and the intake temperature acquired by the intake pressure and temperature sensor can be used for acquiring the simulated intake flow, and the simulated intake flow is used as a standard for correcting the corresponding relation between the flow sensor signal and the induced intake flow, so that the feasibility of the correction method is ensured.
In one embodiment, the method of correcting an engine intake air flow sensor on a vehicle further includes verifying the accuracy of the intake air flow sensor after acquiring the second correspondence relationship. Through the implementation mode, the accuracy of the second corresponding relation can be favorably ensured, a basis is provided for the engine control module to correctly calculate the fuel injection quantity of the engine, and the normal operation of the engine is favorably ensured.
In one embodiment, the verification process comprises the steps of: acquiring a current moment flow sensor signal and acquiring current moment induction air inlet flow according to the second corresponding relation; acquiring current-time simulated intake air flow corresponding to the current-time induced intake air flow; repeating the above steps; and linearly fitting a plurality of the current-time induced intake air flow rates with the corresponding current-time simulated intake air flow rate and calculating correlation coefficients of the linear fitting. By the embodiment, the inspection step is simple and practical, so that the inspection speed is improved.
In one embodiment, the method of modifying an engine intake air flow sensor on a vehicle further comprises locking the throttle in a wide open position. With this embodiment, interference of the throttle valve can be avoided, which is advantageous for more accurately correcting the engine intake air flow sensor mounted on the vehicle.
In one embodiment, feeding back the second correspondence to the engine control module includes automatically feeding back the second correspondence to the engine control module. Through the implementation mode, errors generated in the manual operation process are avoided, the second correct corresponding relation is fed back to the engine control module, and therefore the engine control module can calculate the fuel injection quantity accurately, and normal operation of the engine is guaranteed.
In one embodiment, the intake air flow sensor is a hot film flow sensor. Through this embodiment, because the integrated design of hot film formula intake flow sensor, the change and the maintenance of intake flow sensor are favorable to.
Compared with the prior art, the method for correcting the engine intake flow sensor on the vehicle has the following beneficial effects:
1. the method can correct the engine intake flow sensor when the engine is fixed at the engine mounting position on the vehicle, does not need a special rack and special equipment, is favorable for saving time and labor force, and is also favorable for correcting the engine intake flow sensor mounted on the vehicle at any time, thereby being favorable for ensuring the normal operation of the engine.
2. The planning solution is simple and accurate, so that the second corresponding relation can be acquired in a time-saving and labor-saving manner, and the accuracy of the corrected second corresponding relation is ensured, so that the induced air inflow and the simulated air inflow are consistent.
3. The checking step is beneficial to ensuring the accuracy of the second corresponding relation, and the checking step is simple and practical and is beneficial to improving the checking speed.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings, in which:
FIG. 1 shows a flowchart of a method of correcting an engine intake air flow sensor on a vehicle according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a vehicle engine including sensors according to an embodiment of the present invention;
FIG. 3 illustrates a data record of an engine control module according to an embodiment of the present disclosure;
FIG. 4 illustrates a second modified correspondence according to an embodiment of the invention;
fig. 5 shows the result of the test according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the present embodiment provides a method of correcting an engine intake air flow sensor on a vehicle, including the steps of: closing an exhaust gas recirculation valve; operating the engine from low-speed low-load to high-speed high-load, thereby covering the whole range of the intake air flow; correcting the first corresponding relation between the existing flow sensor signal and the induction intake flow according to a planning solution to form a corrected second corresponding relation; wherein, the flow sensor signal is collected by the air intake flow sensor; feeding back the second corresponding relation to the engine control module; wherein the engine is fixed in an engine mounting position on the vehicle.
The engine intake air flow sensor measures the air flow inhaled by the engine, converts the measurement result into an electric signal and transmits the electric signal to the engine control module. The engine control module calculates the induction air inflow according to the corresponding relation between the flow sensor signal and the induction air inflow, and calculates the fuel injection quantity of the engine according to the induction air inflow.
Therefore, the engine control module can correctly calculate the fuel injection quantity of the engine only when the corresponding relation between the signal of the flow sensor and the induction air inflow is accurate. And correcting the engine intake flow sensor, namely correcting the corresponding relation between the flow sensor signal and the induction intake flow.
The prior art requires the use of a dedicated stand and dedicated equipment to correct the engine intake air flow sensor. Therefore, the correction of the engine intake flow sensor by using the prior art is time-consuming and labor-consuming, has high requirements on the working environment, and cannot be performed at any time.
The method disclosed in the application fixes the engine at the engine mounting position on the vehicle when the engine intake air flow sensor is corrected, and does not need to transfer the engine from the vehicle to a special stand or use special equipment.
The method disclosed by the application does not need a special rack and special equipment, so that the time and labor force are saved, and the correction of the engine intake flow sensor arranged on a vehicle at any time is facilitated, so that the normal operation of the engine is ensured.
The method disclosed by the application uses devices of the engine, such as an air inlet pressure temperature sensor and an engine control module, to obtain more accurate air inlet flow, and corrects the corresponding relation between the flow sensor signal and the induction air inlet flow according to a planning solution. In the present application, the correspondence relationship between the flow sensor signal before correction and the induced intake air flow is the first correspondence relationship, and the correspondence relationship between the flow sensor signal after correction and the induced intake air flow is the second correspondence relationship. The method disclosed in the present application aims to obtain the second correspondence.
In the method disclosed by the application, when the engine intake air flow sensor is corrected, the exhaust gas recirculation valve is closed firstly, so that the interference of recirculated exhaust gas is avoided. The method disclosed in the present application requires the engine to be operated from low speed, low load to high speed, high load, so as to cover the entire range of the intake air flow, i.e., the correction range is the entire range of the operation range of the intake air flow sensor.
And after the second corresponding relation is obtained according to the planning solution, the second corresponding relation is fed back to the engine control module, the engine control module is ensured to obtain accurate induction intake flow by applying the second corresponding relation, and the fuel injection quantity of the engine is calculated according to the accurate induction intake flow, so that the engine achieves the optimal air-fuel ratio, and the normal operation of the engine is ensured.
Optionally, in this embodiment, modifying the first corresponding relationship between the existing flow sensor signal and the induced intake air flow according to a planning solution to form a modified second corresponding relationship includes: the engine control module acquires induction air inflow according to the flow sensor signal by utilizing a first corresponding relation; the engine control module acquires simulated intake air flow according to the intake pressure, the intake temperature and a third corresponding relation acquired by the intake pressure and temperature sensor, wherein the third corresponding relation is used for expressing an algorithm among the intake pressure, the intake temperature and the simulated intake air flow; calculating the difference value between the induction air inflow and the corresponding simulated air inflow, summing the difference values and taking the absolute value of the sum to obtain the absolute value of the sum; the second correspondence is obtained such that the absolute value of the sum is minimized.
The present application uses simulated inlet flow as a standard to correct the correspondence of the flow sensor signal to sensed inlet flow. Acquiring the simulated intake flow requires acquiring the intake pressure and the intake temperature by using an intake pressure temperature sensor. The engine control module may convert the intake pressure and the intake temperature into a simulated intake flow using the third correspondence relationship. The intake pressure temperature sensor is less interfered by the outside, so that the measured intake pressure and intake temperature are more accurate, and the deviation is not easy to generate in use. Also, since the front end flow rate is equal to the rear end flow rate in the same intake system, the correspondence relationship between the flow sensor signal and the sensed intake air flow rate can be corrected using the simulated intake air flow rate as a criterion. In the present application, when the sensed intake air flow rate is consistent with the simulated intake air flow rate, the correction result may be considered to be correct, that is, the second correspondence relationship is correct.
The intake pressure temperature sensor is a part of the engine, so that in the process of correcting the corresponding relation between the flow sensor signal and the induction intake flow, a special rack and special equipment are not needed, the engine is still fixed at the installation position of the engine on the vehicle, the time and labor force are saved, and the correction of the engine intake flow sensor installed on the vehicle at any time is facilitated.
In order to make the sensed intake air flow rate consistent with the simulated intake air flow rate, the engine intake air flow sensor may be modified using a planning solution. Alternatively, the plan solving process may be calculated using Excel.
Specifically, during the engine operation from low speed and low load to high speed and high load, the intake flow sensor generates a flow sensor signal, and the intake pressure temperature sensor acquires the intake pressure and the intake temperature. The sensed intake air flow rate can be obtained using the first correspondence relationship based on the flow sensor signal. And the engine control module acquires the simulated intake air flow according to the intake pressure, the intake temperature and the third corresponding relation acquired by the intake pressure and temperature sensor. Then, calculating the difference value between the induction air inflow and the simulated air inflow, summing all the difference values and taking the absolute value of the sum to obtain the absolute value of the sum; the absolute value of the sum is minimized, thereby obtaining the second correspondence.
The planning solution is simple and accurate, so that the second corresponding relation can be acquired in a time-saving and labor-saving manner, and the accuracy of the corrected second corresponding relation is ensured, so that the induced air inflow and the simulated air inflow are consistent.
Alternatively, the engine control module of the present embodiment prestores a third correspondence relationship.
Since the engine control module prestores the third corresponding relationship, the engine control module can convert the intake pressure and the intake temperature collected by the intake pressure temperature sensor into a simulated intake air flow. Because the installation environment of the air inlet pressure temperature sensor is stable, deviation is not easy to generate in the use process after calibration, the third corresponding relation is fixed, and repeated correction is not needed. The engine control module may pre-store the third correspondence in the engine control module for use in favor of increasing the rate of correction.
Alternatively, the intake air flow sensor of the present embodiment is located in an intake hose at the front end of the engine supercharger.
The intake flow sensor is very sensitive to the gas flow field. And because the intake flow sensor is positioned in an intake hose at the front end of the engine supercharger, the intake flow sensor is easily interfered by unstable environment in the hose. Therefore, during use of the vehicle, the measurement of the intake air flow sensor is often deviated, resulting in an abnormality in the intake control of the engine. At this time, only by correcting the intake flow sensor, the accuracy of the intake flow sensor can be ensured.
Optionally, the intake pressure temperature sensor of the present embodiment is located in a rigid intake manifold at the rear end of the intercooler.
The rigid intake manifold has stable internal environment, so that the installation environment of the intake pressure temperature sensor is stable, and the deviation is not easy to generate in the use process after calibration, thereby obtaining the simulated intake flow by using the intake pressure and the intake temperature acquired by the intake pressure temperature sensor, and correcting the corresponding relation between the flow sensor signal and the induced intake flow by using the simulated intake flow as a standard.
Optionally, the method of correcting the engine intake air flow sensor on the vehicle of the present embodiment further includes checking the accuracy of the intake air flow sensor after acquiring the second correspondence relationship.
The purpose of the test is to ensure that the second corresponding relation is accurate, namely the induced air inflow obtained by using the signals of the flow sensor and the second corresponding relation is consistent with the actual air inflow, so that a basis is provided for an engine control module to correctly calculate the oil injection quantity of the engine, and the normal operation of the engine is favorably ensured.
Optionally, the inspection process of this embodiment includes the following steps: acquiring a current moment flow sensor signal and acquiring current moment induction air inlet flow according to a second corresponding relation; acquiring current-time simulated intake air flow corresponding to the current-time induced intake air flow; repeating the above steps; and linearly fitting the plurality of current-time induced intake air flows and the corresponding current-time simulated intake air flow and calculating the correlation coefficient of the linear fitting.
Specifically, as the correlation coefficient approaches 1, the higher the degree of coincidence of the sensed intake air flow rate with the simulated intake air flow rate, that is, the more accurate the second correspondence relationship. The inspection steps are simple and practical, and the inspection speed is improved.
Optionally, the method of the present embodiment of correcting the engine intake air flow sensor on the vehicle further includes locking the throttle valve at the fully open position.
If the vehicle is equipped with a throttle valve, it is necessary to ensure that the throttle valve is in the fully open position when using the method disclosed in the present application, so as to avoid interference of the throttle valve, which is advantageous for more accurately correcting the engine intake air flow sensor mounted on the vehicle.
Optionally, the feeding back the second correspondence relationship to the engine control module of the present embodiment includes automatically feeding back the second correspondence relationship to the engine control module.
The manual operation is easy to generate errors, the errors can be avoided by automatically feeding back the errors to the engine control module, and the correct second corresponding relation can be fed back to the engine control module, so that the engine control module can calculate the fuel injection quantity accurately, and the normal operation of the engine is guaranteed.
Optionally, the present application may also employ manual feedback to feedback the second correspondence to the engine control module.
Alternatively, the intake air flow sensor of the present embodiment is a hot-film type flow sensor.
The working principle of the hot film type flow sensor is a Wheatstone bridge, and a hot wire resistor, a compensation resistor and a bridge resistor are manufactured on the same ceramic substrate by using a thick film process. Due to the integrated design, the thermal mode flow sensor is easy to replace and is beneficial to maintenance.
Alternatively, the method disclosed in the present application may be applied to the correction of other intake air flow sensors. Other intake air flow sensors may be, but are not limited to, hot wire flow sensors, vaned flow sensors, karman vortex flow sensors.
The method of the present invention will be described below by taking a hot film type intake air flow sensor as an example.
In the present embodiment, referring to fig. 2, the intake flow sensor is located in the intake hose at the front end of the engine supercharger, the intake pressure and temperature sensor is located in the rigid intake manifold at the rear end of the intercooler, and the direction of the arrow in fig. 2 is the gas flow direction. Due to the internal environment stability of the rigid intake manifold, the intake pressure and the intake temperature acquired by the intake pressure temperature sensor can be used for acquiring the simulated intake flow, and the simulated intake flow is used as a standard to correct the corresponding relation between the flow sensor signal and the induction intake flow, namely, the engine intake flow sensor is corrected.
The engine is fixed in the engine mounting position on the vehicle throughout the process of correcting the engine intake air flow sensor. The engine is not required to be transferred from the vehicle to a special stand, and special equipment is not required to be used, so that time and labor are saved, and the engine intake air flow sensor mounted on the vehicle is corrected at any time, so that the normal operation of the engine is ensured.
Specifically, an Exhaust Gas Recirculation (EGR) valve is closed first to avoid interference of recirculated Exhaust Gas. If the vehicle is equipped with a throttle (called "IAT" for short), it is desirable to lock the throttle in the wide open position to avoid throttle interference.
Then, the engine is operated from a low speed and low load to a high speed and high load so that the intake air flow rate of the engine covers the entire range of the intake air flow rate. While the engine is running, the intake pressure temperature sensor continuously collects the intake temperature and the intake pressure, and the intake flow sensor continuously collects the flow sensor signals, which respectively form the third column, the fourth column and the sixth column in fig. 3. Of these, fig. 3 is only a portion excerpted from the entire data.
An Engine Control Module (abbreviated as "ECM") receives the intake air temperature and the intake air pressure collected by the intake air pressure temperature sensor, and obtains a simulated intake air flow rate by using a prestored third correspondence relationship. The third correspondence relationship may convert the intake pressure, the intake temperature into a simulated intake air flow rate. The simulated intake air flow rate constitutes the fifth column in fig. 3.
Because the air inlet pressure temperature sensor is less interfered by the outside, the air inlet pressure and the air inlet temperature measured by the air inlet pressure temperature sensor are more accurate, and the deviation is not easy to generate in use. Also, since the front end flow rate is equal to the rear end flow rate in the same intake system, the correspondence relationship between the flow sensor signal and the sensed intake air flow rate can be corrected using the simulated intake air flow rate as a criterion.
The engine control module also stores a first correspondence to be corrected, i.e., a correspondence between the existing flow sensor signal and the sensed intake air flow. The induced intake air flow corresponding to different flow sensor signals can be calculated through the corresponding relation between the flow sensor signals and the induced intake air flow. The calculation process may apply a function or a linear relationship.
Specifically, while the relationship between the flow sensor signal and the sensed intake air flow may be expressed using a function, the flow sensor signal may be converted to the sensed intake air flow using the function.
When the relationship between the flow sensor signal and the sensed intake air flow rate cannot be expressed as a function, the sensed intake air flow rate can be calculated using a linear relationship. The correspondence relationship between the flow sensor signal and the sensed intake air flow rate includes a plurality of incremental flow sensor signals and sensed intake air flow rates corresponding thereto. When the flow sensor signal is between two adjacent flow sensor signals, a linear fit can be applied to calculate the corresponding induced intake air flow.
At this time, Excel may be applied, and the first correspondence relationship between the existing flow sensor signal and the induced intake air flow is corrected using a planning solution to form a corrected second correspondence relationship. Specifically, the simulated intake air flow rate is set to the first column of the meter, and the sensed intake air flow rate is set to the second column of the meter. The third column of the table is the difference between the sensed intake airflow and the corresponding simulated intake airflow, and the absolute value of the sum is obtained by summing and taking the absolute value of the third column. The process of correction is to minimize the absolute value of the sum, during which the second row is constantly changing until stable, i.e. the correspondence of the flow sensor signal to the sensed inlet flow is constantly changing until stable. After the air inlet flow is stabilized, the corresponding relation between the flow sensor signal and the induction air inlet flow is a second corresponding relation. Fig. 4 is the corrected second corresponding relationship.
The corrected second corresponding relation can be automatically fed back to the engine control module; manual feedback may also be employed to feedback the second correspondence to the engine control module. The manual operation is easy to generate errors, the errors can be avoided by automatically feeding back the errors to the engine control module, and the correct second corresponding relation can be fed back to the engine control module, so that the engine control module can calculate the fuel injection quantity accurately, and the normal operation of the engine is guaranteed.
After the second correspondence relationship is obtained, the second correspondence relationship may be checked, thereby checking the accuracy of the corrected intake air flow sensor. Specifically, the current moment induction air inlet flow is obtained by utilizing the current moment flow sensor signal according to the second corresponding relation; then, acquiring the current time simulated intake air flow corresponding to the current time induced intake air flow; repeating the above steps; and finally, linearly fitting the plurality of current-time induction air inflow flows and the current-time simulation air inflow flows corresponding to the current-time induction air inflow flows, and calculating the correlation coefficient of linear fitting. As shown in fig. 5, the correlation coefficient is as high as 0.998 and approaches 1, and each point is substantially located on the fitting line. Therefore, the correction method disclosed by the application is reliable and accurate. The second corresponding relation obtained by the method can be applied to the engine control module, provides a basis for the engine control module to correctly calculate the fuel injection quantity of the engine, and is favorable for ensuring the normal operation of the engine.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. A method of correcting an engine intake air flow sensor on a vehicle, characterized by comprising the steps of:
closing an exhaust gas recirculation valve;
operating the engine from low-speed low-load to high-speed high-load, thereby covering the whole range of the intake air flow; correcting the first corresponding relation between the existing flow sensor signal and the induction intake flow according to a planning solution to form a corrected second corresponding relation; wherein the flow sensor signal is collected by the intake flow sensor;
feeding back the second corresponding relation to an engine control module;
wherein the engine is fixed at an engine mounting location on the vehicle.
2. The method of modifying an engine intake air flow sensor on-board a vehicle of claim 1, wherein modifying the existing first correspondence of the flow sensor signal and the sensed intake air flow according to the programmed solver to form the modified second correspondence comprises:
the engine control module acquires the induction intake air flow rate according to the flow sensor signal by utilizing the first corresponding relation;
the engine control module acquires a simulated intake air flow according to a third corresponding relation between the intake pressure and the intake temperature acquired by the intake pressure and temperature sensor, wherein the third corresponding relation is used for representing an algorithm among the intake pressure, the intake temperature and the simulated intake air flow;
calculating the difference value between the induction air inflow and the corresponding simulated air inflow, summing the difference values and taking the absolute value of the sum to obtain the absolute value of the sum;
the second correspondence is obtained such that the absolute value of the sum is minimized.
3. The method of modifying an engine intake air flow sensor on a vehicle of claim 2, wherein the engine control module prestores the third correspondence relationship.
4. The method of modifying an engine intake air flow sensor on a vehicle of claim 2, wherein the intake air flow sensor is located within an intake hose at a front end of an engine supercharger.
5. The method of modifying an engine intake air flow sensor on a vehicle of claim 2, wherein the intake pressure temperature sensor is located within a rigid intake manifold at a rear end of an intercooler.
6. The method of correcting an engine intake air flow sensor on a vehicle according to claim 2, further comprising verifying the accuracy of the intake air flow sensor after acquiring the second correspondence relationship.
7. The method of modifying an engine intake air flow sensor on a vehicle of claim 6, wherein the verification process includes the steps of:
acquiring a current moment flow sensor signal and acquiring current moment induction air inlet flow according to the second corresponding relation;
acquiring current-time simulated intake air flow corresponding to the current-time induced intake air flow;
repeating the above steps;
and linearly fitting a plurality of the current-time induced intake air flow rates with the corresponding current-time simulated intake air flow rate and calculating correlation coefficients of the linear fitting.
8. The method of modifying an engine intake air flow sensor on a vehicle of claim 1, further comprising locking the throttle in a wide open position.
9. The method of modifying an engine intake air flow sensor on a vehicle of claim 1, wherein feeding back the second correspondence to the engine control module includes automatically feeding back the second correspondence to the engine control module.
10. The method of modifying an engine intake air flow sensor on a vehicle of claim 1, wherein the intake air flow sensor is a hot film flow sensor.
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| CN104024806A (en) * | 2011-12-23 | 2014-09-03 | 大陆汽车有限责任公司 | Method for operating an air mass sensor |
| CN104736978A (en) * | 2012-10-23 | 2015-06-24 | 大陆汽车有限责任公司 | Method for operating an air flow meter |
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