CN107480313A - Cylinder temperature computational methods, system and the vehicle of engine - Google Patents

Cylinder temperature computational methods, system and the vehicle of engine Download PDF

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Publication number
CN107480313A
CN107480313A CN201610756569.XA CN201610756569A CN107480313A CN 107480313 A CN107480313 A CN 107480313A CN 201610756569 A CN201610756569 A CN 201610756569A CN 107480313 A CN107480313 A CN 107480313A
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China
Prior art keywords
cylinder
temperature
exhaust manifold
engine
crank angle
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CN201610756569.XA
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Inventor
刘婷
莫珊珊
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Beiqi Foton Motor Co Ltd
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Borgward Automotive China Co Ltd
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Priority to CN201610756569.XA priority Critical patent/CN107480313A/en
Publication of CN107480313A publication Critical patent/CN107480313A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • F02D2200/0414—Air temperature
    • 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
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses cylinder temperature computational methods, system and the vehicle of a kind of engine, this method includes：Gas temperature in motor intake manifold is obtained according to fresh airflow rate in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold and the gas flow rate for entering cylinder；Delivery temperature is obtained according to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, the waste gas flow velocity being included in the waste gas flow velocity and air of exhaust manifold；Residual gas temperature in cylinder is obtained according to crank angle corresponding to volume of the engine when crank angle is predetermined corner in cylinder, the crank angle at IC Intake Valve Closes moment, the crank angle and combustion end time at exhauxt valve opens moment；Residual gas temperature obtains cylinder temperature in gas temperature, delivery temperature and cylinder in inlet manifold.The invention has the advantages that：Computational accuracy is high, applied widely.

Description

Cylinder temperature computational methods, system and the vehicle of engine
Technical field
The present invention relates to technical field of vehicle, and in particular to cylinder temperature computational methods, system and the car of a kind of engine .
Background technology
Fuel-oil atmozation degree that engine cylinder temperature can influence to be ejected into cylinder, in the burning starting stage, it is determined The distribution of fuel-air mixture, it can also influence the whole combustion process of engine, include the exhaust gas component of discharge.
In correlation technique, obtain cylinder temperature information and employ calculating method, pass through the data of existing sensor on engine Information calculates cylinder temperature.When problems with being present using calculating method in correlation technique：
Poor universality：Existing algorithm is only applicable to a engine, because some key messages in control algolithm are bases Drawn in the substantial amounts of test data of this engine, if engine parameter is different, such as related components size, can cause to try Testing data can not be general.
Influence of the residual gas to gas in the jar temperature in cylinder is not accounted for.Residual gas in cylinder is High Temperature Gas Body, especially engine with supercharger, when engine is in cold or warming-up process, temperature shadow of the residual gas to gas in the jar Ring notable.
The content of the invention
It is contemplated that at least solves one of above-mentioned technical problem.
Therefore, it is an object of the present invention to propose a kind of cylinder temperature computational methods of engine.
It is another object of the present invention to the cylinder temperature computing system for proposing a kind of engine；
It is another object of the present invention to propose a kind of vehicle.
To achieve these goals, one embodiment of the present of invention discloses the cylinder temperature computational methods of engine, bag Include following steps：According to fresh airflow rate and entrance in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold The gas flow rate of cylinder obtains the gas temperature in motor intake manifold；According to the gas temperature in exhaust manifold, gas pressure Power and exhaust manifold volume, the waste gas flow velocity being included in the waste gas flow velocity and air of exhaust manifold obtain delivery temperature；According to hair When volume of the motivation when crank angle is predetermined corner in cylinder, the crank angle at IC Intake Valve Closes moment, exhauxt valve opens Crank angle corresponding to the crank angle and combustion end time at quarter obtains residual gas temperature in cylinder；According to the inlet manifold In gas temperature, residual gas temperature obtains the cylinder temperature in delivery temperature and the cylinder.
The cylinder temperature computational methods of engine according to embodiments of the present invention, calculate the gas in motor intake manifold Temperature, waste gas flow velocity obtain delivery temperature and crank angle obtains residual gas temperature in cylinder, finally according in inlet manifold Residual gas temperature obtains the cylinder temperature in gas temperature, delivery temperature and the cylinder, has computational accuracy height, is applicable model Enclose the advantages of wide.
In addition, the cylinder temperature computational methods of engine according to the above embodiment of the present invention, can also have following attached The technical characteristic added：
Further, the dynamic model of the gas temperature in the motor intake manifold is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
Further, the dynamic model of the delivery temperature is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
Further, the dynamic model of residual gas temperature is in the cylinder：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcAir inlet is represented respectively Door close moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e are matching efficiency of combustion and heat transfer Coefficient, Q is fuel oil calorific value, mfFor distributive value.
Further, the gas temperature in the inlet manifold, delivery temperature, residual gas temperature and described in the cylinder Cylinder temperature meets following relational expression, and the relational expression is：
Wherein, mjqAnd mcyThe residual waste gas quantity indicated entry into respectively in the gas flow and cylinder of cylinder.
To achieve these goals, an alternative embodiment of the invention discloses a kind of cylinder temperature calculating system of engine System, including：Intake air temperature computing module, for according in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold The gas flow rate of fresh airflow rate and entrance cylinder obtains the gas temperature in motor intake manifold；Delivery temperature calculates mould Block, for according to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, be included in the waste gas flow velocity of exhaust manifold Delivery temperature is obtained with the waste gas flow velocity in air；Residual gas temperature computation module, for according to engine in crank angle For predetermined corner when cylinder in volume, the crank angle at IC Intake Valve Closes moment, the crank angle at exhauxt valve opens moment and Crank angle corresponding to combustion end time obtains residual gas temperature in cylinder；Cylinder temperature determining module, for according to Residual gas temperature obtains the cylinder temperature in gas temperature, delivery temperature and the cylinder in inlet manifold.
The cylinder temperature computing system of engine according to embodiments of the present invention, calculate the gas in motor intake manifold Temperature, waste gas flow velocity obtain delivery temperature and crank angle obtains residual gas temperature in cylinder, finally according in inlet manifold Residual gas temperature obtains the cylinder temperature in gas temperature, delivery temperature and the cylinder, has computational accuracy height, is applicable model Enclose the advantages of wide.
In addition, the cylinder temperature computing system of engine according to the above embodiment of the present invention, can also have following attached The technical characteristic added：
Further, the dynamic model of the gas temperature in the motor intake manifold is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
Further, the dynamic model of the delivery temperature is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
Further, the dynamic model of residual gas temperature is in the cylinder：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcAir inlet is represented respectively Door close moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e are matching efficiency of combustion and heat transfer Coefficient, Q is fuel oil calorific value, mfFor distributive value.
To achieve these goals, an alternative embodiment of the invention discloses a kind of vehicle, including above-described embodiment institute The cylinder temperature computing system for the engine stated.
Described vehicle and the cylinder temperature computing system of above-mentioned engine are relative to advantage possessed by prior art It is identical, it will not be repeated here.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment Substantially and it is readily appreciated that, wherein：
Fig. 1 be the engine described in the embodiment of the present invention cylinder temperature computational methods in engine schematic diagram
Fig. 2 is the flow chart of the cylinder temperature computational methods of the engine of one embodiment of the invention；
Fig. 3 is the structured flowchart of the cylinder temperature computing system of the engine of one embodiment of the invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ", The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark Show that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right The limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint are relative Importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this Concrete meaning in invention.
With reference to following description and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.In these descriptions In accompanying drawing, some particular implementations in embodiments of the invention are specifically disclosed, to represent to implement the implementation of the present invention Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention Embodiment includes all changes, modification and the equivalent fallen into the range of the spirit and intension of attached claims.
Before the cylinder temperature computational methods of the engine of the description embodiment of the present invention, engine is retouched first State.As shown in figure 1, the structure of engine is inlet manifold 1, cylinder 2, exhaust manifold 3 and air inlet pressure sensor 4, wherein, enter Air pressure force snesor 4 is arranged in inlet manifold 3, for measuring the gas pressure in inlet manifold 3.
The present invention is introduced below in conjunction with accompanying drawing.
Fig. 2 is the structured flowchart of the cylinder temperature computational methods of the engine of one embodiment of the invention.As shown in figure 1, The cylinder temperature computational methods of the engine of the embodiment of the present invention, comprise the following steps：
S201：According to fresh airflow rate in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold and enter The gas flow rate for entering cylinder obtains the gas temperature in motor intake manifold.
In one embodiment of the invention, the dynamic model of the gas temperature in motor intake manifold is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
Specifically, the gas temperature model of inlet manifold is established.Compared with pressure sensor, temperature sensor has slower Response characteristic, in order to improve the precision of control system, without using in temperature sensor measurement inlet manifold in example of the present invention Gas temperature, but be modeled by the relation pair intake air temperature between gas pressure and temperature.According to quality and energy Conservation equation, the gas temperature T in motor intake manifoldjqDynamic model be represented by：
Wherein, R is ideal gas constant.PjqAnd VjqThe gas pressure and inlet manifold body in inlet manifold are represented respectively Product, the measurable admission pressure P of air inlet pressure sensor in inlet manifoldjq, the volume of inlet manifold is by design structure Determine, for specific engines, it is known quantity.TkqAnd TqgThe temperature of fresh air is represented respectively and into cylinder interior gas Temperature.γ1For specific heat ratio.WithThe flow velocity of fresh air and the gas stream into cylinder in air inlet pipe are represented respectively Speed, the two amounts can be will herein be described in detail by equation and the calculating of speed density equation of damming.
, can be by right for the air inflow entered from inlet manifold in cylinderIntegration is carried out to obtain.
Due to flowing into the gas temperature T in cylinderqgIt is not easy to measure, herein by establishing its pass between admission pressure System, is expressed it with admission pressure：
Then obtain：
Similarly, the model that can obtain delivery temperature is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively.WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.γ2For specific heat ratio.
S202：According to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, it is included in the useless of exhaust manifold Waste gas flow velocity in gas velocity and air obtains delivery temperature.
In one embodiment of the invention, the dynamic model of delivery temperature is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
S203：According to volume of the engine when crank angle is predetermined corner in cylinder, the song at IC Intake Valve Closes moment Crank angle corresponding to Shaft angle, the crank angle and combustion end time at exhauxt valve opens moment obtains residual gas temperature in cylinder Degree.
In one embodiment of the invention, the dynamic model of residual gas temperature is in cylinder：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcAir inlet is represented respectively Door close moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e are matching efficiency of combustion and heat transfer Coefficient, Q is fuel oil calorific value, mfFor distributive value.
Specifically, remainder of exhaust gas temperature and quality in cylinder are modeled.In cylinder remainder of exhaust gas temperature can approximation recognize To be the gas temperature in exhauxt valve opens moment cylinder, it is desirable to which gas in the jar temperature when solving exhauxt valve opens is, it is necessary to know Temperature variations in whole combustion process：First stage be from IC Intake Valve Closes to burning before, second stage is from burning It is preceding to all burnt, the phase III is from all burnt to exhauxt valve opens.Therefore, the model of residual gas temperature is：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcAir inlet is represented respectively Door close moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e are matching efficiency of combustion and heat transfer Coefficient, Q is fuel oil calorific value, mfFor distributive value.
S204：Residual gas temperature obtains cylinder temperature in gas temperature, delivery temperature and cylinder in inlet manifold.
In one embodiment of the invention, the gas temperature in inlet manifold, delivery temperature, residual gas temperature in cylinder Meet following relational expression with cylinder temperature, relational expression is：
Wherein, mjqAnd mcyThe residual waste gas quantity indicated entry into respectively in the gas flow and cylinder of cylinder.For in cylinder Residual gas, obtained using equation for ideal gases：
The cylinder temperature computational methods of the engine of the embodiment of the present invention, calculate the gas temperature in motor intake manifold Degree, waste gas flow velocity obtains delivery temperature and crank angle obtains residual gas temperature in cylinder, finally the gas in inlet manifold Residual gas temperature obtains cylinder temperature in temperature, delivery temperature and cylinder, has computational accuracy high, applied widely excellent Point.
Fig. 3 is the flow chart of the cylinder temperature computing system of the engine of the embodiment of the present invention.It is as shown in figure 3, of the invention The cylinder temperature computing system 300 of the engine of embodiment, including intake air temperature computing module 310, delivery temperature calculate module 320th, residual gas temperature computation module 330 and cylinder temperature determining module 340.
Wherein, intake air temperature computing module 310 is used for according to the admission pressure in inlet manifold, inlet manifold volume, entered Fresh airflow rate and the gas flow rate into cylinder obtain the gas temperature in motor intake manifold in gas manifold.Exhaust temperature Degree computing module 320 is used for according to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, is included in exhaust manifold Waste gas flow velocity and air in waste gas flow velocity obtain delivery temperature.Residual gas temperature computation module 330 is used for basis and started Volume of the machine when crank angle is predetermined corner in cylinder, the crank angle at IC Intake Valve Closes moment, exhauxt valve opens moment Crank angle and combustion end time corresponding to crank angle obtain residual gas temperature in cylinder.Cylinder temperature determining module Residual gas temperature obtains cylinder temperature in 340 gas temperatures being used in inlet manifold, delivery temperature and cylinder.
The cylinder temperature computing system of engine according to embodiments of the present invention, calculate the gas in motor intake manifold Temperature, waste gas flow velocity obtain delivery temperature and crank angle obtains residual gas temperature in cylinder, then according in inlet manifold Residual gas temperature obtains cylinder temperature in gas temperature, delivery temperature and cylinder, has computational accuracy high, applied widely excellent Point.
In one embodiment of the invention, the dynamic model of the gas temperature in motor intake manifold is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
In one embodiment of the invention, the dynamic model of delivery temperature is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
In one embodiment of the invention, the dynamic model of residual gas temperature is in cylinder：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcAir inlet is represented respectively Door close moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e are matching efficiency of combustion and heat transfer Coefficient, Q is fuel oil calorific value, mfFor distributive value.
It should be noted that the specific implementation of the cylinder temperature computing system of the engine of the embodiment of the present invention and sheet The specific implementation of the cylinder temperature computational methods of the engine of inventive embodiments is similar, specifically refers to retouching for method part State, in order to reduce redundancy, do not repeat herein.
Further, embodiment of the invention discloses that a kind of vehicle, is provided with any one embodiment as described above The cylinder temperature computing system of engine.
In addition, other compositions of vehicle according to embodiments of the present invention and effect are for one of ordinary skill in the art For be all known, in order to reduce redundancy, do not repeat herein.
In addition, the cylinder temperature computational methods of the engine of the embodiment of the present invention, other compositions of system and vehicle and Effect is all known for a person skilled in the art, in order to reduce redundancy, is not repeated.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this The scope of invention is by claim and its equivalent limits.

Claims (10)

1. the cylinder temperature computational methods of a kind of engine, it is characterised in that comprise the following steps：
According to fresh airflow rate in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold and enter cylinder Gas flow rate obtains the gas temperature in motor intake manifold；
According to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, be included in exhaust manifold waste gas flow velocity and Waste gas flow velocity in air obtains delivery temperature；
According to volume of the engine when crank angle is predetermined corner in cylinder, the crank angle at IC Intake Valve Closes moment, row Crank angle corresponding to the crank angle and combustion end time of valve opening time obtains residual gas temperature in cylinder；
Residual gas temperature obtains warm in the cylinder in gas temperature, delivery temperature and the cylinder in the inlet manifold Degree.
2. the cylinder temperature computational methods of engine according to claim 1, it is characterised in that the engine charge discrimination The dynamic model of gas temperature in pipe is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
3. the cylinder temperature computational methods of engine according to claim 1, it is characterised in that the delivery temperature is moved States model is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
4. the cylinder temperature computational methods of engine according to claim 1, it is characterised in that residual gas in the cylinder The dynamic model of temperature is：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcIC Intake Valve Closes are represented respectively Moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e is matching efficiency of combustion and heat transfer is Number, Q are fuel oil calorific value, mfFor distributive value.
5. the cylinder temperature computational methods of engine according to claim 1, it is characterised in that in the inlet manifold Gas temperature, delivery temperature, residual gas temperature and the cylinder temperature meet following relational expression, the relational expression in the cylinder For：
Wherein, mjqAnd mcyThe residual waste gas quantity indicated entry into respectively in the gas flow and cylinder of cylinder.
A kind of 6. cylinder temperature computing system of engine, it is characterised in that including：
Intake air temperature computing module, for according to fresh in the admission pressure in inlet manifold, inlet manifold volume, inlet manifold The gas flow rate of air velocity and entrance cylinder obtains the gas temperature in motor intake manifold；
Delivery temperature calculate module, for according to the gas temperature in exhaust manifold, gas pressure and exhaust manifold volume, be included in Waste gas flow velocity in the waste gas flow velocity and air of exhaust manifold obtains delivery temperature；
Residual gas temperature computation module, for according to volume of the engine when crank angle is predetermined corner in cylinder, enter Crank angle corresponding to the crank angle of valve closing time, the crank angle and combustion end time at exhauxt valve opens moment obtains Residual gas temperature in cylinder；
Cylinder temperature determining module, for remaining in the gas temperature in the inlet manifold, delivery temperature and the cylinder Gas temperature obtains the cylinder temperature.
7. the cylinder temperature computing system of engine according to claim 1, it is characterised in that the engine charge discrimination The dynamic model of gas temperature in pipe is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air is represented respectively.
8. the cylinder temperature computing system of engine according to claim 1, it is characterised in that the delivery temperature is moved States model is：
Wherein, Tpq、PpqAnd VpqGas temperature, pressure and the exhaust manifold volume in exhaust manifold are represented respectively,WithThe waste gas flow velocity entered from cylinder in exhaust manifold and air, γ are represented respectively2For specific heat ratio.
9. the cylinder temperature computing system of engine according to claim 1, it is characterised in that residual gas in the cylinder The dynamic model of temperature is：
Wherein, Vqg(θ) is volume of the engine when crank angle is θ in cylinder, θjq、θpqAnd θcIC Intake Valve Closes are represented respectively Moment, exhauxt valve opens moment and crank angle corresponding to combustion end time, e is matching efficiency of combustion and heat transfer is Number, Q are fuel oil calorific value, mfFor distributive value.
A kind of 10. vehicle, it is characterised in that including：The cylinder temperature meter of engine according to claim any one of 6-9 Calculation system.
CN201610756569.XA 2016-08-29 2016-08-29 Cylinder temperature computational methods, system and the vehicle of engine Pending CN107480313A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117195436A (en) * 2023-11-01 2023-12-08 北京理工大学 Method for determining length of exhaust manifold of multi-cylinder opposed-piston engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117195436A (en) * 2023-11-01 2023-12-08 北京理工大学 Method for determining length of exhaust manifold of multi-cylinder opposed-piston engine
CN117195436B (en) * 2023-11-01 2024-01-23 北京理工大学 Method for determining length of exhaust manifold of multi-cylinder opposed-piston engine

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Address before: 100102 building, No. 1, 2 Tong Tung Avenue, Chaoyang District, Beijing

Applicant before: Baowa Automobile (China) Co., Ltd.

RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20171215