CN106762176A - A kind of stroke admission calculation of pressure method of two cylinder machine four - Google Patents
A kind of stroke admission calculation of pressure method of two cylinder machine four Download PDFInfo
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- CN106762176A CN106762176A CN201611145099.XA CN201611145099A CN106762176A CN 106762176 A CN106762176 A CN 106762176A CN 201611145099 A CN201611145099 A CN 201611145099A CN 106762176 A CN106762176 A CN 106762176A
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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
- F02D41/0002—Controlling intake air
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of stroke admission calculation of pressure method of two cylinder machine four, the method is based on engine relational system, and the system includes hardware circuit unit, bottom control unit and application control unit, comprises the following steps:Step one, engine operating condition is identified；Step 2, carry out air inflow calculating according to different operating modes；Step 3, demarcation amendment is carried out to air inflow；Step 4, calculate Engine Injection Mass, the angle of ignition.The method step one carries out engine operating condition identification by engine speed, is start operating performance when engine speed is started from scratch, when engine speed is higher than setting value, accidental conditions when can read correct crankshaft signal.When engine is in start operating performance, intake pressure sensor signal high-frequency communicates the pressure voltage signal that air- distributor pressure is read in sampling, the corresponding air- distributor pressure of voltage signal is calculated with high-frequency again, reading distance according to the characteristic curve of air inlet pressure sensor calculates oil spout, angle of ignition moment nearest air inflow.
Description
Technical field
The invention belongs to aviation gasoline engine control system development technique field, and in particular to a kind of stroke of two cylinder machine four
Admission pressure computational methods.
Background technology
Cylinder pressure is that the important parameter of fresh air in feedback cylinder is also close by speed in suction stroke
Degree method accurately calculates the major parameter of air input of engine by air, and only calculating accurate air inflow can just make engine output optimal
Power, reduces oil consumption, optimization discharge.
Two cylinder four-stroke piston engine, each cylinder has air inlet, compression, acting, four strokes of exhaust, therefore for two
For cylinder four-stroke piston type engine, each working cycles have about 1/2 stroke in air-suction state, about 1/2 row in addition
Journey in non-air-suction state.Two cylinder machine four-stroke piston engine in suction stroke, enter closing before inlet manifold with
Cylinder is communicated, and is analyzed by CAE (Computer Aided Engineering) and stand measured data is obtained,
Very little is differed with inner pressure of air cylinder in certain point or certain region air- distributor pressure before valve-closing, this difference can
Eliminated with by the demarcation amendment of engine control system.Therefore can obtain entering in cylinder by calculating air- distributor pressure
The pressure of fresh air, the relation according to pressure and flow is so as to calculate the fresh air into cylinder.In addition, two cylinder machine four
The working characteristics of single stroke piston type engine just determine the variation characteristic of air- distributor pressure see Fig. 1 (working cycles
Air- distributor pressure), the true corresponding air- distributor pressure of inner pressure of air cylinder that feeds back should be a suitable region or certain point.
Because the electric injection system technology application of aero-engine is not extensive enough, the application of two cylinder machine four-stroke piston is less, without access
To the data for being computed correctly the reciprocating piston engine charge pressure of two cylinder machine four, it is opposed that this invention can be used for the stroke of two cylinder machine four
The piston engine of formula and in-line arrangement.
The content of the invention
According to above the deficiencies in the prior art, the technical problems to be solved by the invention are to propose a kind of stroke of two cylinder machine four
Admission pressure computational methods, by engine operating condition identification and the calculating of air- distributor pressure, calculate accurate air inflow
Engine can be made to export optimal power, reduce oil consumption, optimization discharge.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of stroke admission pressure of two cylinder machine four
Computational methods, the method is based on electronic engine management system, and the system includes hardware circuit unit, bottom control unit and answers
Layer control unit is used, is comprised the following steps:Step one, engine operating condition is identified；Step 2, carried out according to different operating modes
Air inflow is calculated；Step 3, demarcation amendment is carried out to air inflow；Step 4, calculate Engine Injection Mass, the angle of ignition.The party
Method step one carries out engine operating condition identification by engine speed, is divided into two kinds of operating modes:The first, engine is in the slow-speed of revolution
When, obtain operating mode when precision can not meet the required precision for calculating rotation speed change by calculating rotating speed based on hypodontia；Second, work as hair
Motivation rotating speed is higher than certain setting value, and the required precision for calculating rotation speed change can be met by obtaining precision based on hypodontia calculating rotating speed
When operating mode.Wherein setting value is obtained according to hardware with software composite calibration.When engine is in the first operating mode, air inlet
Pressure sensor signal high-frequency communicates sampling and reads the pressure voltage signal of air- distributor pressure, then is calculated with high-frequency
The corresponding air- distributor pressure of voltage signal, according to speed densimetry, charge flow rate is converted into from pushing away by air- distributor pressure
Add fresh air flow in cylinder.When engine is under accidental conditions, sensed by calculating air- distributor pressure
Device is transformed into inner pressure of air cylinder by characteristic curve, so as to calculate into fresh air flow in cylinder.The method also includes imitative
True method of testing, the method for testing includes：Step a, simulation model is set up, realized to pressure sensor voltage signal to pressure
Conversion；Step b, data are preset, and scalar quantity is preset according to sensor characteristic；Step c, carry out simulating, verifying.Institute
State step c simulating, verifyings whether reasonable including the design of hardware circuit unit, bottom control unit and application control unit.It is described imitative
True method of testing cannot dash forward for calculating oil spout air inflow when simulation model is in stable state in a working cycles
Become；The inner pressure of air cylinder that admission pressure is calculated with HIL equipment simulatings can not differ by more than 10%；ECU software calculate flow with
The flow difference that HIL equipment simulatings are calculated is no more than 10%.The method also includes actual measurement verification method, the method verification step
It is as follows：Sensor is installed, and the air inlet pressure sensor of stand is installed at inlet manifold resonator, and hookup wire is gone out in exhaust main
Property lambda sensor；Measuring instrument is installed, and fuel consumption meter is routinely installed, and air-fuel ratio measuring instrument is routinely installed, and Combustion tester is routinely pacified
Dress, corner marking instrument is routinely installed, and cylinder pressure sensor is routinely installed, and calibration facility is installed according to demand；The variable of measurement, stand collection
Data include：Engine speed, throttle opening, instantaneous oil consumption, manifold pressure, air-fuel ratio, cylinder pressure, IC Intake Valve Closes
First 5 ° of cylinder pressure signal, with actual measurement air-fuel ratio and the engine flow or the hair with mass air flow sensor actual measurement of fuel consumption meter inverse
Motivation flow；ECU gathered datas include：Air- distributor pressure, software that the voltage signal of air inlet pressure sensor, software are calculated
The air inflow of calculating, demand air-fuel ratio, fuel injection pulsewidth.The method also includes actual measurement verification method, the result verification side of the method
Method includes：Step 1) crankshaft angles verification, the setting angle of ignition and oil spout are performed at 1 cylinder compression top center, gathered with oscillograph
Whether crankshaft signal, fuel injection pulsewidth are with igniting implementation status in demand position, it is ensured that crankshaft signal wheel is installed errorless while verification
Whether bottom software angle design of interruption is identical with actual demand, if difference needs to adjust bottom software algorithm；Step 2) it is special
Linearity curve is verified, fixed rotating speed, throttle opening, and 5 ° of crank angles are corresponding before the valve-closing that collection Combustion tester is measured
Inner pressure of air cylinder, and the corresponding working cycles of ECU collections pressure comparison, whether deviation is controlled within 5%；If it exceeds model
Enclosing needs to adjust calibrating parameters of the sensor voltage signal to pressure conversion；Change rotating speed and throttle opening, using side above
Method carries out more than three times verifications；If result of calculation is controlled within 5% in deviation, characterisitic parameter is demarcated and passed through, if knot
The really unacceptable setting for needing to investigate the characteristic reliability of air inlet pressure sensor and Combustion tester；Step 3) air inlet
The reliability demonstration of calculation of pressure, first demarcates to engine flow, and the flow calculated ECU after the completion of demarcation is anti-with stand
The flow of calculation is contrasted, and flow difference will be controlled within 3%, otherwise needs modification admission pressure to be changed to engine flow
Calibrating parameters.
Present invention has the advantages that:The present invention proposes a kind of stroke admission calculation of pressure method of two cylinder machine four, by starting
The calculating of machine operating mode's switch and air- distributor pressure, calculating accurate air inflow can just make engine export optimal power, drop
Low oil consumption, optimization discharge.
Brief description of the drawings
The mark in the content and figure expressed by this specification accompanying drawing is briefly described below：
Fig. 1 is the air- distributor pressure schematic diagram of the working cycles of specific embodiment of the invention.
Fig. 2 is the CAE analysis pressure measurement point schematic diagram of specific embodiment of the invention.
Fig. 3 is the corresponding pressure schematic diagram of measurement point of specific embodiment of the invention.
Fig. 4 is the flow chart of the embodiment of specific embodiment of the invention.
Fig. 5 is the algorithm flow chart of specific embodiment of the invention.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, specific embodiment of the invention such as involved each component
Shape, the mutual alignment between construction, each several part and annexation, the effect of each several part and operation principle, manufacturing process and
Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology
Scheme has more complete, accurate and deep understanding.
A kind of algorithm of two cylinder machine four-stroke gasoline engine admission pressure of present invention design, including engine operating condition is recognized and entered
The calculating of gas manifold pressure, particular content is as follows：
Engine operating condition is recognized first.It is correct not finding also because engine speed is started from scratch in start-up course
Crankshaft signal when cannot read correct current crank angle, therefore valve when close it is also unknown, under this kind of operating mode (below
Referred to as start operating performance) intake valve cannot be used to close before certain spend or certain region the pressure that calculates in cylinder of manifold pressure, so
Another algorithm is needed during start operating performance.After engine speed is higher than certain value, correct crankshaft signal can be read i.e.
Accurate crank angle, this kind of operating mode (hereinafter referred to as accidental conditions) can recognize the IC Intake Valve Closes moment, can be with entering
The air- distributor pressure in certain point or certain region calculates the pressure in cylinder before gas valve-closing.
Calculating to air- distributor pressure under different operating modes, the accurate calculating of air inlet is to accurately calculate engine
Distributive value, the angle of ignition, reduce oil consumption, improve power output etc..The oil spout of two cylinder machine four-stroke piston engine, igniting be all
Each cylinder compression top center right position is performed once, therefore air inflow calculates and needs to complete before this.It can be appreciated that
Air inflow is updated before compression top center to calculate.According to this demand, we can obtain the computational methods of following air- distributor pressure：
1) under start operating performance, intake pressure sensor signal high-frequency communicates the pressure voltage letter that air- distributor pressure is read in sampling
Number.Again the corresponding air- distributor pressure of voltage signal, the spy of computational methods foundation air inlet pressure sensor are calculated with high-frequency
Linearity curve (by air inlet pressure sensor, supplier provides).Read distance and calculate oil spout, angle of ignition moment nearest air inflow, as far as possible
Reduce the deviation that air inflow is calculated.2) under accidental conditions, meter is reduced because high-frequency communication increases chip operation load
Calculate frequency and consider more precisely to calculate air- distributor pressure.Cylinder internal pressure is obtained using by calculating air- distributor pressure
Power is so as to calculate the method into fresh air flow in cylinder.This patent selects certain of the auspicious aviation power Equipment Limited of boat
One or two cylinder four-stroke piston type petrol engines.Gather 7500 revs/min of data of (7500rpm) of the engine, CAE emulation knots
Fruit sees Fig. 2 (CAE pressure measurement points schematic diagram) and Fig. 3 (the corresponding pressure of measurement point), wherein 0 ° (or 720 °) are in the compression of 1 cylinder
Stop, 180 ° is 1 cylinder exhaust bottom dead center, and 360 ° is 1 cylinder air inlet top dead centre, and 1 cylinder 540 is air inlet lower dead center.For engine control
We are it is understood that true pressure in valve-closing front air cylinder for system.The as engine corresponding crank angle position
570 ° the crank angle of 1mm lift valve operatings while closing () measurement point is got over and is proximate to cylinder as seen from Figure 3, the pressure for measuring closer to
Inner pressure of air cylinder.The pressure in the pressure and cylinder of air intake duct is found to the emulation of multiple operating points, there is one-to-one relationship.By
Statistics is obtained under different rotating speeds, different load, and the pressure of motor intake manifold is within 5 degree of moment and cylinder before valve-closing
Differing pressure deviation can receive, and deviation under different rotating speeds, different load can be by admission pressure to correspondence operating mode
Lower charge flow rate can be eliminated after carrying out demarcation amendment when changing.Therefore admission pressure can be substituted with manifold pressure, for counting
Calculate the actual flow of engine.For discharge capacity, intake and exhaust two cylinder four-stroke engine this angle possible difference different with arrangement,
But choosing principles are the same.
The first step, functional development.
Due to engine management system (hereinafter referred to as ECU) component software (bottom software, application layer software) and hardware, implement
Protocol procedures are shown in Fig. 4.If to calculate admission pressure for two cylinder machine four-stroke piston engine, ECU needs to include following
Function：
1st, ECU hardware, supports air inlet pressure sensor function and simultaneously to design response circuit, and to have hf channel for
Support the magnitude of voltage of output manifold pressure.
2nd, bottom software is, it is necessary to support high-frequency acquisition function and produce software interrupt to call specific letter according to crankshaft signal
Several functions.
3rd, application layer software is, it is necessary to support that engine operating condition judges, high frequency and software interrupt classified calculating admission pressure
Function, algorithm flow is shown in Fig. 5.
Second step, functional verification.
1st, based on model functional simulation test, realize to conversion from pressure sensor voltage signal to pressure.Including voltage
The selection of signal, treatment and conversion from the voltage signal after choosing to pressure.
2nd, data are preset, and scalar quantity is preset according to sensor characteristic, and wherein characteristic curve is by admission pressure
The supplier of sensor provides.
3rd, hardware-in-the-loop test, in order to the scope for confirming function, saving experimentation cost and verification experimental verification is comprehensive, one
As hardware-in-the-loop test is first carried out before engine object authentication.This paper schemes are selected in HIL (hardware-in-the-
Loop emulation testing on).Checking content：
Whether whether rationally hardware circuit design, checks reasonable by the voltage signal of ECU outputs；
Whether rationally bottom software angle design of interruption, checked after Integrated Simulation and produce the angle and crankshaft signal of interruption
The reasonability of relative position；
Whether application layer software algorithm is reasonable, if realize that two admission pressures of cylinder are calculated；
Comprehensive value model：
● during stable state, cannot be undergone mutation in a working cycles for calculating oil spout air inflow；
● the inner pressure of air cylinder that admission pressure is calculated with HIL equipment simulatings can not differ by more than 10%；
● the flow that the flow that ECU software is calculated is calculated with HIL equipment simulatings is differed no more than 10%.
3rd, actual measurement checking.
This selected works is selected and verified on engine pedestal.The instrument of needs has engine, the hair for carrying ECU and related components
Motivation stand, fuel consumption meter, air-fuel ratio measuring instrument (carrying linear oxygen sensors), Combustion tester, corner marking instrument, cylinder pressure sensor,
Calibration facility.
Verification step is as follows,
Sensor is installed：The air inlet pressure sensor of stand is installed at inlet manifold resonator, peace is gone out in exhaust main
Dress linear oxygen sensors.
Measuring instrument is installed：Fuel consumption meter is routinely installed, and air-fuel ratio measuring instrument is routinely installed, and Combustion tester is routinely installed,
Corner marking instrument is routinely installed, and cylinder pressure sensor is routinely installed, and calibration facility is installed according to demand.
The variable of measurement：
The data of stand collection include：Engine speed, throttle opening, instantaneous oil consumption, manifold pressure, air-fuel ratio, gas
(correspondence crank angle) cylinder pressure signal 5 ° before cylinder pressure, IC Intake Valve Closes, with actual measurement air-fuel ratio and the hair of fuel consumption meter inverse
Motivation flow or the engine flow surveyed with mass air flow sensor；
ECU gathered datas include：Air- distributor pressure, software that the voltage signal of air inlet pressure sensor, software are calculated
The air inflow of calculating, demand air-fuel ratio, fuel injection pulsewidth.
Result verification method：
1) crankshaft angles verification, the setting angle of ignition is performed with oil spout at 1 cylinder compression top center, uses oscillograph collecting crankshaft
Whether signal, fuel injection pulsewidth are with igniting implementation status in demand position, it is ensured that crankshaft signal wheel is installed errorless while verifying bottom
Whether software respective design of interruption is identical with actual demand, if difference needs to adjust bottom software algorithm；
2) characteristic curve verification
Fixed rotating speed, throttle opening, 5 ° of crank angles are corresponding before the valve-closing that collection Combustion tester is measured
Inner pressure of air cylinder, and the corresponding working cycles of ECU collections pressure comparison, whether deviation is controlled within 5%.If it exceeds model
Enclosing needs to adjust calibrating parameters of the sensor voltage signal to pressure conversion.
Change rotating speed and throttle opening, more than three times verifications are carried out using above method.If result of calculation is can
In the range of receiving (deviation is controlled within 5%), then characterisitic parameter is demarcated and passed through, if result is unacceptable to need to investigate air inlet
The setting of the reliability and Combustion tester of pressure sensor characteristic curve.
3) reliability demonstration that admission pressure is calculated, first demarcates to engine flow, and ECU is calculated after the completion of demarcation
Flow contrasted with the flow of stand inverse, flow difference will be controlled within 3%, otherwise need modification admission pressure to
Engine flow changes calibrating parameters.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that the present invention is implemented and do not receive aforesaid way
Limitation, as long as employing the improvement of various unsubstantialities that method of the present invention design and technical scheme are carried out, or without changing
Enter and design of the invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.This hair
Bright protection domain should be determined by the scope of protection defined in the claims.
Claims (9)
1. the stroke admission calculation of pressure method of a kind of two cylinder machine four, it is characterised in that the method is based on engine electronic control system system
System, the system includes hardware circuit unit, bottom control unit and application layer control unit, comprises the following steps:It is step one, right
Engine operating condition is identified；Step 2, carry out air inflow calculating according to different operating modes；Step 3, air inflow is demarcated
Amendment；Step 4, calculate Engine Injection Mass, the angle of ignition.
2. the stroke admission calculation of pressure method of two cylinder machine according to claim 1 four, it is characterised in that the method step one
Engine operating condition identification is carried out by engine speed, is divided into two kinds of operating modes:The first, engine in the slow-speed of revolution, by base
Rotating speed is calculated in hypodontia obtain operating mode when precision can not meet the required precision for calculating rotation speed change；Second, work as engine speed
Higher than certain setting value, operating mode when precision meets the required precision for calculating rotation speed change is obtained by calculating rotating speed based on hypodontia.
3. the stroke admission calculation of pressure method of two cylinder machine according to claim 2 four, it is characterised in that when engine is in
During the first operating mode, intake pressure sensor signal high-frequency communicates the pressure voltage letter that air- distributor pressure is read in sampling
Number, then the corresponding air- distributor pressure of voltage signal is calculated with high-frequency, according to speed densimetry, by air- distributor pressure
It is converted into charge flow rate and enters fresh air flow in cylinder from reckoning.
4. the stroke admission calculation of pressure method of two cylinder machine according to claim 2 four, it is characterised in that when engine is in
Under accidental conditions, inner pressure of air cylinder is transformed into by characteristic curve by calculating intake manifold pressure sensor, so as to push away
Add fresh air flow in cylinder.
5. the stroke admission calculation of pressure method of two cylinder machine according to claim 1 four, it is characterised in that the method also includes
Emulation test method, the method for testing includes：Step a, simulation model is set up, realized to pressure sensor voltage signal to pressure
Conversion；Step b, data are preset, and scalar quantity is preset according to sensor characteristic；Step c, carry out simulating, verifying.
6. the stroke admission calculation of pressure method of two cylinder machine according to claim 5 four, it is characterised in that the step c is imitated
True checking includes whether the design of hardware circuit unit, bottom control unit and application control unit is reasonable.
7. the stroke admission calculation of pressure method of two cylinder machine according to claim 5 four, it is characterised in that the emulation testing
Method cannot undergo mutation for calculating oil spout air inflow when simulation model is in stable state in a working cycles；Air inlet
The inner pressure of air cylinder that pressure is calculated with HIL equipment simulatings can not differ by more than 10%；The flow that ECU software is calculated and HIL equipment
The flow difference for calculating is simulated no more than 10%.
8. the stroke admission calculation of pressure method of two cylinder machine according to claim 1 four, it is characterised in that the method also includes
Actual measurement verification method, the method verification step is as follows：Sensor is installed, and the air inlet pressure of stand is installed at inlet manifold resonator
Force snesor, goes out to install linear oxygen sensors in exhaust main；Measuring instrument is installed, and fuel consumption meter is routinely installed, air-fuel ratio measurement
Instrument routinely install, Combustion tester routinely install, corner marking instrument routinely install, cylinder pressure sensor routinely install, calibration facility according to
Demand is installed；The variable of measurement, the data of stand collection include：Engine speed, throttle opening, instantaneous oil consumption, manifold pressure
5 ° of cylinder pressure signal before power, air-fuel ratio, cylinder pressure, IC Intake Valve Closes, with actual measurement air-fuel ratio and the hair of fuel consumption meter inverse
Motivation flow or the engine flow surveyed with mass air flow sensor；ECU gathered datas include：The voltage letter of air inlet pressure sensor
Number, software calculate air- distributor pressure, software calculate air inflow, demand air-fuel ratio, fuel injection pulsewidth.
9. the stroke admission calculation of pressure method of two cylinder machine according to claim 6 four, it is characterised in that the method also includes
Actual measurement verification method, the result verification method of the method includes：Step 1) crankshaft angles verification, the setting angle of ignition is with oil spout 1
Performed at cylinder compression top center, with oscillograph collecting crankshaft signal, fuel injection pulsewidth with igniting implementation status whether in demand position,
Ensure crankshaft signal wheel install it is errorless and meanwhile verify bottom software angle design of interruption it is whether identical with actual demand, if different
Need to adjust bottom software algorithm；Step 2) characteristic curve verification, fixed rotating speed, throttle opening, collection Combustion tester survey
Valve-closing before the corresponding inner pressure of air cylinder of 5 ° of crank angles, and the corresponding working cycles of ECU collections pressure comparison, partially
Whether difference is controlled within 5%；If it exceeds scope needs to adjust calibrating parameters of the sensor voltage signal to pressure conversion；More
Change rotating speed and throttle opening, more than three times verifications are carried out using above method；If result of calculation deviation control 5% with
Interior, then characterisitic parameter is demarcated and passed through, if result is unacceptable to need to investigate the characteristic reliability of air inlet pressure sensor
With the setting of Combustion tester；Step 3) admission pressure calculate reliability demonstration, first engine flow is demarcated, demarcate
After the completion of to ECU calculate flow contrasted with the flow of stand inverse, flow difference will be controlled within 3%, otherwise needed
Change admission pressure and change calibrating parameters to engine flow.
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| CN201611145099.XA CN106762176B (en) | 2016-12-13 | 2016-12-13 | Method for calculating four-stroke intake pressure of two-cylinder machine |
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| CN108104962A (en) * | 2018-01-27 | 2018-06-01 | 郏政广 | A kind of fuel engines electronic control type gas handling system |
| CN108519237A (en) * | 2018-04-26 | 2018-09-11 | 吉林大学 | A kind of test system measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine |
| CN108519237B (en) * | 2018-04-26 | 2023-09-22 | 吉林大学 | Test system for measuring inflation efficiency of each cylinder of multi-cylinder internal combustion engine |
| CN109882303B (en) * | 2019-04-23 | 2022-04-19 | 江门市大长江集团有限公司 | Fuel injection control method, device, equipment and storage medium |
| CN109882303A (en) * | 2019-04-23 | 2019-06-14 | 江门市大长江集团有限公司 | Fuel oil injection control method, device, equipment and storage medium |
| CN111006867A (en) * | 2019-11-26 | 2020-04-14 | 广西玉柴机器股份有限公司 | Calibration method of engine air intake correction map table and air intake correction method |
| CN110926821A (en) * | 2019-11-28 | 2020-03-27 | 哈尔滨东安汽车动力股份有限公司 | Method for evaluating accuracy of engine inflation model |
| CN113550825A (en) * | 2020-04-24 | 2021-10-26 | 北京福田康明斯发动机有限公司 | Self-adaptive type air inlet pressure system diagnosis method and device for diesel engine |
| CN113550825B (en) * | 2020-04-24 | 2022-09-09 | 北京福田康明斯发动机有限公司 | Diesel engine self-adaptive type air inlet pressure system diagnosis method and device |
| WO2021249214A1 (en) * | 2020-06-09 | 2021-12-16 | 中国第一汽车股份有限公司 | Fuel injection control method for direct injection engine |
| CN113432881A (en) * | 2021-07-15 | 2021-09-24 | 哈尔滨工程大学 | Method for simulating compression pressure and temperature in two-stroke cylinder by using four-stroke single cylinder |
| CN113626950A (en) * | 2021-08-11 | 2021-11-09 | 广东皓耘科技有限公司 | Bundling machine design method and device, storage medium and electronic equipment |
| CN113626950B (en) * | 2021-08-11 | 2024-03-19 | 广东皓耘科技有限公司 | Bundling machine design method and device, storage medium and electronic equipment |
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