CN110926821A - Method for evaluating accuracy of engine inflation model - Google Patents
Method for evaluating accuracy of engine inflation model Download PDFInfo
- Publication number
- CN110926821A CN110926821A CN201911193094.8A CN201911193094A CN110926821A CN 110926821 A CN110926821 A CN 110926821A CN 201911193094 A CN201911193094 A CN 201911193094A CN 110926821 A CN110926821 A CN 110926821A
- Authority
- CN
- China
- Prior art keywords
- engine
- air
- fuel ratio
- ecu
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 18
- 239000000446 fuel Substances 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 19
- 238000013102 re-test Methods 0.000 abstract 1
- 239000003570 air Substances 0.000 description 37
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
An evaluation method for the accuracy of an engine inflation model belongs to the technical field of engine evaluation. Confirming the state of an engine body, acquiring data for measurement if the state of the engine body changes, performing additional measurement or retest if the data has problems, watching and recording various signals in the ECU through a notebook computer, and transmitting torque and rotating speed by a dynamometer to obtain the air inlet pressure in an air inlet system of the engine and the theoretical air inlet quantity of the engine; the oil consumption meter is used for measuring the actual oil consumption of the engine and transmitting the actual oil consumption to the rack control system; the air-fuel ratio meter calculates the air-fuel ratio of the engine and transmits the air-fuel ratio to the bench control system, and the actual air inflow of the engine at the working point is obtained; calculating the deviation between the air input of the ECU and the actually measured air input of the external equipment; and measuring the actual air inflow of the engine, and comparing the actual air inflow with the theoretical air inflow obtained from the ECU. The invention can evaluate the accuracy of the engine inflation model; the calibration data level of each working condition can be longitudinally verified, and the evaluation method can be transversely compared with the existing external equipment.
Description
Technical Field
The invention relates to an evaluation method for the accuracy of an engine inflation model, and belongs to the technical field of engine evaluation.
Background
In the process of matching the engine with an electronic fuel injection system, the rotating speed and the air inflow of the engine need to be accurately measured, so that the fuel injection (gas) amount and the ignition lift angle are accurately controlled, and the air-fuel ratio is accurately controlled, so that the aims of optimizing the dynamic property, the fuel economy and the emission of the engine are fulfilled. The crankshaft position sensor can easily measure the rotating speed of the engine, and the accurate calculation of the air inflow under each working condition of the engine is an extremely complex calibration process, namely a process for establishing an air charging model. The establishment of the air charging model is the primary task of engine electronic fuel injection system calibration, subsequent calibration work is carried out on the basis of the established air charging model, and the precision of the air charging model greatly influences the calibration quality of the whole electronic fuel injection system, so that the accuracy of the air charging model needs to be evaluated.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides an evaluation method for the accuracy of an engine inflation model.
The invention adopts the following technical scheme: a method of assessing accuracy of an engine charge model, the method comprising the steps of:
the method comprises the following steps: confirming the state of the engine body;
step two: if the state changes in the first step, selecting a working condition point of a universal experiment to collect data for measurement, and if the data has problems, performing additional measurement or retesting;
step three: various signals obtained in the ECU during the operation of the engine are watched and recorded through calibration software in the notebook computer, wherein the dynamometer transmits torque and rotating speed through the adapter flange and the transmission shaft, the intake pressure in an engine intake system can be obtained through the engine body, and the theoretical intake air quantity of the engine is obtained through calculation of the ECU;
step four: the oil consumption meter is used for measuring the actual oil consumption of the engine and transmitting data to the rack control system;
step five: the air-fuel ratio meter calculates the air-fuel ratio of the engine by collecting the exhaust system and combining with the environmental air pressure information collected by the rack control system, transmits the air-fuel ratio to the rack control system, records the air-fuel ratio in a notebook computer, and calculates the actual air inflow of the engine at the working point according to the oil consumption and the air-fuel ratio;
step six: calculating the deviation between the air input of the ECU and the actually measured air input of the external equipment;
step seven: the actual air inflow of the engine is measured through the oil consumption instrument and the air-fuel ratio instrument, the actual air consumption of the engine is measured through the external instrument by the oil consumption instrument which is obtained through electronic injection calibration, data are transmitted to the notebook computer to be recorded, and the data are compared with the theoretical air inflow obtained from the ECU.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the accuracy of the engine inflation model can be evaluated by calculating the difference percentage between the engine air inflow calculated by the ECU under each working condition and the engine air inflow actually measured by the existing equipment; the evaluation method has the advantages that the calibration data levels of all working conditions can be longitudinally checked, the existing external equipment can be used for transversely comparing the evaluation method, the test evaluation result is real and reliable, the evaluation method is suitable for most of electronic injection systems, and the evaluation method is concise and understandable, high in operation execution effectiveness, and meets the design concept of universality, low cost, reliability and high efficiency.
Drawings
FIG. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a schematic diagram of prior art engine charge model accuracy;
FIG. 3 is a graphical representation of the engine charge model accuracy evaluated by the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The first embodiment is as follows: as shown in fig. 1 to 3, the invention discloses an engine inflation model accuracy evaluation method, wherein a 1.5L engine body 5 is fixed on a rack, and an air intake system 1, an oil supply system 2, a water circulation cooling system 4, a transfer flange 6, a transmission shaft 7, a dynamometer 8, an ECU9, a rack control system 11, an exhaust system 12 and an exhaust gas treatment and discharge 13 all belong to common rack control system equipment systems, so that an engine can normally run on the rack. The oil consumption meter 3, the notebook computer 10 and the air-fuel ratio meter 14 are common equipment and assist in knowing the working condition of the engine and controlling the action of each actuator of the engine; the method comprises the following steps:
the method comprises the following steps: confirming the state of the engine body 5;
step two: if the state in the step one is changed and the inflation efficiency of the engine is influenced by general conditions, selecting a working condition point of a universal experiment to collect data measurement, and if the data has problems, performing additional measurement or retesting;
step three: various signals obtained in the ECU9 during the operation of the engine are watched and recorded through calibration software in the notebook computer 10, wherein the dynamometer 8 transmits torque and rotating speed through the adapter flange 6 and the transmission shaft 7, so that the working states of the rotating speed, the torque and the like of the engine at the moment can be obtained, relevant data such as air inlet pressure in the air inlet system 1 of the engine can be obtained through a corresponding air inlet temperature pressure sensor and the like on the engine body 5, corresponding air charging efficiency values are obtained in the calibration data of the electronic fuel injection system in the previous period after the data are integrated, and the theoretical air inlet quantity of the engine is calculated through the data ECU 9;
step four: the oil (gas) consumption instrument 3 measures the actual oil consumption of the engine through an external instrument and transmits data to the rack control system 11;
step five: the air-fuel ratio meter 14 calculates the air-fuel ratio of the engine by collecting components in the exhaust system 12 and combining with the information such as the ambient air pressure collected by the rack control system 11, transmits the air-fuel ratio to the rack control system 11, records the air-fuel ratio in the notebook computer 10, and calculates the actual air inflow of the engine at the working point according to the oil consumption and the air-fuel ratio;
step six: and calculating the deviation between the air inflow of the ECU9 and the actually measured air inflow of the external equipment at each working condition point, considering dispersion and precision factors and the like, and according to full experimental verification and reference of a large number of empirical values, the deviation between the engine and the external equipment under small load, most working conditions and full load can meet the precision requirement of an engine inflation model within 5%. FIG. 2 shows the accuracy of an engine inflation model calibrated by a certain conventional electronic fuel injection company, FIG. 3 shows the accuracy of the engine inflation model obtained by the evaluation method of the present invention, and the evaluation results all meet the accuracy requirements of the inflation model row, and the evaluation method of the present invention is true and reliable;
step seven: the actual air input of the engine is measured through the external oil (gas) consumption instrument 3 and the external air-fuel ratio instrument 14, the actual air input of the engine is measured through the external instrument and the oil (gas) consumption instrument 3 obtained through electronic injection calibration, the data is transmitted to the notebook computer 10 to be recorded, and the data is compared with the theoretical air input obtained through the ECU9, so that the air charging model calibrated by the engine in the early stage is compared, the accuracy of the air charging model of the engine is checked, the evaluation result meets the requirement of the air charging model accuracy, and the evaluation method is real and reliable.
The second embodiment is as follows: in the present embodiment, the first embodiment is further described, and the step of confirming the state of the engine body 5 includes: the calibration data of the engine body 5 and the ECU9 for ensuring the accuracy of the inflation model are consistent with the state in calibration, particularly the states of the air intake system 1 and the exhaust system 12 of the engine are confirmed, the air filter and the air intake manifold in the air intake system 1 are checked and confirmed, the exhaust manifold and the three-way catalyst in the exhaust system 12 are checked and confirmed, and the states of all accessories are consistent with the state in calibration.
The third concrete implementation mode: in this embodiment, the first or second embodiment is further described, the measurement in the second step should be performed after the engine is sufficiently warmed up, and each operating point is measured after the engine is stably operated.
The invention considers the adaptation to various electronic injection systems by mastering the working principle of analyzing the engine and corresponding parts, the electronic injection system and each measuring device and by means of the existing devices.
The invention can longitudinally check the calibration data level under each working condition, and can also transversely compare the data relationship between air inlet models of different electronic injection systems and different engines to quantify and visualize the data relationship; the method is suitable for most of electronic injection systems, and is true and reliable in test and evaluation results by means of the conventional external equipment. The evaluation method is simple and easy to understand, high in operation execution effectiveness, and in line with the design concepts of universality, low cost, reliability and high efficiency.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. An engine inflation model accuracy assessment method, characterized by: the method comprises the following steps:
the method comprises the following steps: confirming the state of the engine body (5);
step two: if the state changes in the first step, selecting a working condition point of a universal experiment to collect data for measurement, and if the data has problems, performing additional measurement or retesting;
step three: various signals in the running process of the engine, which are acquired from an ECU (9), are watched and recorded through calibration software in a notebook computer (10), wherein a dynamometer (8) transmits torque and rotating speed through a transfer flange (6) and a transmission shaft (7), the intake pressure in an engine intake system (1) can be obtained through an engine body (5), and the theoretical intake air quantity of the engine is obtained through calculation of the ECU (9);
step four: the oil consumption meter (3) measures the actual oil consumption of the engine and transmits data to the bench control system (11);
step five: the air-fuel ratio meter (14) calculates the air-fuel ratio of the engine by collecting the exhaust system (12) and combining with the environmental air pressure information collected by the rack control system (11), transmits the air-fuel ratio to the rack control system (11), records the air-fuel ratio in the notebook computer (10), and calculates the actual air inflow of the engine at the working point according to the oil consumption and the air-fuel ratio;
step six: calculating the deviation between the air inflow of the ECU (9) and the actually measured air inflow of the external equipment;
step seven: the actual air inflow of the engine is measured through the oil consumption meter (3) and the air-fuel ratio meter (14), the actual air consumption of the engine is measured through the external instrument by the oil consumption meter (3) which is obtained through electronic injection calibration, data are transmitted to the notebook computer (10) to be recorded, and the data are compared with the theoretical air inflow obtained through the ECU (9).
2. The method of claim 1 for assessing accuracy of an engine charge model, wherein: step one said confirming the state of the engine block (5) comprises: the method comprises the steps of ensuring that calibration data of an engine body (5) and an ECU (9) for evaluating the accuracy of an inflation model are consistent with the state during calibration, confirming the states of an air intake system (1) and an exhaust system (12) of the engine, checking and confirming an air filter and an air intake manifold in the air intake system (1), checking and confirming an exhaust manifold and a three-way catalyst of the engine in the exhaust system (12) and checking and confirming an exhaust main pipe, and ensuring that the states of accessories are consistent with the calibration time.
3. The method of claim 1 for assessing accuracy of an engine charge model, wherein: and step two, the measurement is carried out after the engine is warmed up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193094.8A CN110926821A (en) | 2019-11-28 | 2019-11-28 | Method for evaluating accuracy of engine inflation model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193094.8A CN110926821A (en) | 2019-11-28 | 2019-11-28 | Method for evaluating accuracy of engine inflation model |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110926821A true CN110926821A (en) | 2020-03-27 |
Family
ID=69847587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911193094.8A Pending CN110926821A (en) | 2019-11-28 | 2019-11-28 | Method for evaluating accuracy of engine inflation model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110926821A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324760A (en) * | 2021-06-17 | 2021-08-31 | 哈尔滨东安汽车动力股份有限公司 | Emission optimization calibration method for automobile acceleration and deceleration working condition |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204532524U (en) * | 2015-03-20 | 2015-08-05 | 北京比特英泰动力技术有限公司 | The flexible control device that a kind of supercharged engine suction pressure is adjustable |
| CN105673238A (en) * | 2016-01-13 | 2016-06-15 | 奇瑞汽车股份有限公司 | Diagnostic method of engine variable intake manifold execution mechanism |
| CN106545427A (en) * | 2016-10-28 | 2017-03-29 | 江苏大学 | A kind of system and method for miniature gasoline engine air-fuel ratio precise control |
| CN106762176A (en) * | 2016-12-13 | 2017-05-31 | 安徽航瑞航空动力装备有限公司 | A kind of stroke admission calculation of pressure method of two cylinder machine four |
| US20180363573A1 (en) * | 2017-06-12 | 2018-12-20 | Jaguar Land Rover Limited | Controlling an air charge provided to an engine |
| CN109268158A (en) * | 2018-09-27 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of modified method and system of air input of engine by air |
-
2019
- 2019-11-28 CN CN201911193094.8A patent/CN110926821A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204532524U (en) * | 2015-03-20 | 2015-08-05 | 北京比特英泰动力技术有限公司 | The flexible control device that a kind of supercharged engine suction pressure is adjustable |
| CN105673238A (en) * | 2016-01-13 | 2016-06-15 | 奇瑞汽车股份有限公司 | Diagnostic method of engine variable intake manifold execution mechanism |
| CN106545427A (en) * | 2016-10-28 | 2017-03-29 | 江苏大学 | A kind of system and method for miniature gasoline engine air-fuel ratio precise control |
| CN106762176A (en) * | 2016-12-13 | 2017-05-31 | 安徽航瑞航空动力装备有限公司 | A kind of stroke admission calculation of pressure method of two cylinder machine four |
| US20180363573A1 (en) * | 2017-06-12 | 2018-12-20 | Jaguar Land Rover Limited | Controlling an air charge provided to an engine |
| CN109268158A (en) * | 2018-09-27 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of modified method and system of air input of engine by air |
Non-Patent Citations (2)
| Title |
|---|
| 万里平等: "基于油耗和空燃比的汽油机充气效率测定方法", 《农业机械学报》 * |
| 蔡胜凯等: "非道路柴油机的排放特性研究", 《内燃机》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324760A (en) * | 2021-06-17 | 2021-08-31 | 哈尔滨东安汽车动力股份有限公司 | Emission optimization calibration method for automobile acceleration and deceleration working condition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6092016A (en) | Apparatus and method for diagnosing an engine using an exhaust temperature model | |
| JP5264429B2 (en) | How to determine the correct flow rate of fuel to a vehicle engine for diagnostic testing | |
| CN103696862A (en) | Method for realizing opening control of EGR (Exhaust Gas Recirculation) valve, device and system | |
| US8386204B2 (en) | Method for the diagnosis of the EGR cooler efficiency in a diesel engine | |
| CN102778360B (en) | Use the state estimation of equivalent time sampling, diagnosis and control | |
| CN101988440A (en) | Method for controlling oil injection of diesel engine | |
| US8170777B2 (en) | Indicating system and method for determining an engine parameter | |
| CN101435377B (en) | Intake air temperature rationality diagnostic | |
| JP2016528416A (en) | Method for vehicle | |
| CN102374094B (en) | Engine fire fault diagnosis method | |
| Stuhldreher et al. | Downsized boosted engine benchmarking and results | |
| CN110926821A (en) | Method for evaluating accuracy of engine inflation model | |
| CN113343482A (en) | Vehicle power system monitoring and management method based on digital twins | |
| US11401881B2 (en) | Fourier diagnosis of a charge cycle behavior of an internal combustion engine | |
| Wang et al. | An intelligent diagnostic tool for electronically controlled diesel engine | |
| CN116447028A (en) | Control method and device for EGR rate of engine system, electronic equipment and storage medium | |
| JP4045529B2 (en) | Vehicle fuel consumption measurement method | |
| Mrđa et al. | A method for quick estimation of engine moment of inertia based on an experimental analysis of transient working process | |
| CN115144668A (en) | Fault detection method, signal simulator and fault detection system | |
| CN107389237A (en) | Measure the method and device of in-cylinder direct fuel-injection engine fuel pump power consumption under different loads | |
| RU2672992C1 (en) | Method for testing devices of high-pressure of diesel fuel system on working engine and device for implementation thereof | |
| Čupera et al. | The use of CAN-Bus messages of an agricultural tractor for monitoring its operation. | |
| CN112729849B (en) | Method and system for testing at least one drive train component | |
| RU2805116C1 (en) | Method for determining effective power of internal combustion engine | |
| JP4577239B2 (en) | Method and apparatus for determining Wiebe function parameters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200327 |
|
| RJ01 | Rejection of invention patent application after publication |