CN113374583B - Exhaust valve control method based on cold start exhaust heat management and storage medium - Google Patents

Exhaust valve control method based on cold start exhaust heat management and storage medium Download PDF

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CN113374583B
CN113374583B CN202110640043.6A CN202110640043A CN113374583B CN 113374583 B CN113374583 B CN 113374583B CN 202110640043 A CN202110640043 A CN 202110640043A CN 113374583 B CN113374583 B CN 113374583B
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exhaust valve
engine
working condition
strategy
eevo
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CN113374583A (en
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楼狄明
唐远贽
谭丕强
胡志远
房亮
张允华
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Tongji University
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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
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0242—Variable control of the exhaust valves only
    • F02D13/0246—Variable control of the exhaust valves only changing valve lift or valve lift and timing
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F02D2200/1004—Estimation of the output torque
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to an exhaust valve control method and a storage medium based on cold start exhaust heat management, wherein the method is used for controlling an exhaust valve when the inlet temperature of a post-processing system is smaller than a preset temperature threshold, and comprises the following steps: obtaining an initial EEVO crankshaft wrap angle; determining the current working condition of the engine by using the position of the accelerator and the rotating speed of the engine, and increasing the early opening angle of the exhaust valve by using an EEVO strategy; calculating the predicted output torque of the engine in real time; obtaining a calibration output torque of the current working condition when the original exhaust valve row line strategy is used for controlling the exhaust valve; if the predicted output torque is lower than the calibrated output torque to a certain degree, the early opening angle of the exhaust valve is postponed, otherwise, the engine dynamic property is normal, and the EEVO strategy is continuously used for controlling the exhaust valve. Compared with the prior art, the invention can flexibly adjust the torque and temperature balance relation between the dynamic property and the exhaust heat management in the actual operation process of the engine, and can ensure that the dynamic property is not excessively reduced while the cold start exhaust temperature is improved to the maximum extent.

Description

Exhaust valve control method based on cold start exhaust heat management and storage medium
Technical Field
The invention relates to the field of engine exhaust control, in particular to an exhaust valve control method and a storage medium based on cold-start exhaust heat management.
Background
Compared with fixed valve lift timing arrangement, the variable valve technology of the diesel engine is a technology capable of giving full play to the potential of energy conservation and emission reduction under partial load of the diesel engine, and particularly, the optimal design of different valve routing lines and intake and exhaust strategies under any working condition can be further realized on the basis of the control strategy of the intake and exhaust system of the diesel engine designed on the basis of the fully variable valve.
In order to make the exhaust emission meet the emission requirement, an exhaust aftertreatment system needs to be arranged behind the diesel engine to perform catalytic conversion on the exhaust, so that the exhaust meets the emission regulation. On diesel vehicles, particularly commercial diesel vehicles, due to the lack of space for arrangement, the aftertreatment system often cannot adopt a close-coupled design, and the exhaust gas temperature before entering the aftertreatment system does not meet the requirement of the optimal catalytic conversion temperature of the aftertreatment system. Therefore, one of the important measures for exhaust heat management is to increase the exhaust temperature and to utilize the heat in the exhaust gas to directly improve the catalytic conversion efficiency of the aftertreatment system.
The EEVO exhaust valve early-opening strategy is an important valve control strategy for exhaust heat management of a diesel engine, the early-opening degree of EEVO has a direct relation with exhaust temperature, and the core idea is that the exhaust valve is opened early so that the exhaust temperature is higher, and the exhaust temperature is usually ensured through the EEVO strategy in the cold starting process of the engine. However, when the EEVO strategy is actually applied, the excessive early opening angle can result in the sacrifice of excessive expansion work in multiple cylinders, so that the dynamic property of the engine is reduced and the engine is unstable in operation, and an effective real-time regulation and control means aiming at the exhaust valve control strategy is lacked at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an exhaust valve control method and a storage medium based on cold start exhaust heat management, an EEVO strategy is used for controlling an exhaust valve in the cold start process of an engine, the predicted output torque is calculated in real time, if the predicted output torque is lower than the calibrated output torque to a certain degree, the dynamic property of the engine is considered to be insufficient, the early opening angle of the exhaust valve is delayed, the torque and temperature balance relation between the dynamic property and the exhaust heat management in the actual operation process of the engine can be flexibly adjusted, and the dynamic property is ensured not to be excessively reduced while the cold start exhaust temperature is improved to the maximum extent.
The purpose of the invention can be realized by the following technical scheme:
an exhaust valve control method based on cold-start exhaust heat management, which is used for controlling an exhaust valve when the inlet temperature of an aftertreatment system is smaller than a preset temperature threshold, comprises the following steps:
s1, obtaining an initial EEVO crankshaft wrap angle
Figure GDA0003832620980000021
Exhaust wrap angle for original exhaust valve based row line strategy
Figure GDA0003832620980000022
The exhaust valve of (2) is started and opened early by an advanced angle;
s2, obtaining the current working condition of the engine, and increasing the early opening angle of the exhaust valve by using an EEVO strategy;
s3, calculating predicted output torque T 'of the engine under the current working condition' tq Obtaining the calibration output torque T of the engine under the current working condition when the original exhaust valve row line strategy is used for controlling the exhaust valve tq λ ranges from (0,1), if T' tq ＜(λ×T tq ) Then, the output torque T 'is predicted' tq And (4) if the engine dynamic property is insufficient, postponing the early opening angle of the exhaust valve according to the preset optimal angle value under the current working condition, and repeating the step (S3), otherwise, repeating the step (S2) if the engine dynamic property is normal.
Further, the temperature threshold is set according to the light-off temperature of the DOC in the aftertreatment system, when the inlet temperature of the aftertreatment system is not smaller than the temperature threshold, the cold start is ended, and the exhaust valve is controlled by the original exhaust valve row line strategy.
Further, the preset temperature threshold is 200 ℃.
Further, in step S2, the current operating condition of the engine is obtained, and the early exhaust valve opening angle of the current operating condition is obtained by looking up a MAP of the EEVO strategy.
Furthermore, the MAP of the EEVO policy is obtained by: and (3) controlling an exhaust valve by using an EEVO strategy under various working conditions, and recording the optimal early opening angle of the exhaust valve under various working conditions to obtain a MAP (MAP) of the EEVO strategy.
Furthermore, in step S3, output torque T 'is predicted' tq The calculation steps are as follows:
obtaining the current throttle position and the engine speed, determining the current working condition based on the throttle position and the engine speed, obtaining a working condition-mechanical efficiency MAP, and obtaining the current mechanical efficiency eta based on the current working condition by looking up a table m The predicted output torque T 'is calculated according to the following formula' tq ：
Figure GDA0003832620980000023
Wherein i represents the number of engine cylinders, P represents the in-cylinder pressure, and τ represents the number of strokes.
Further, in step S3, the current throttle position and the engine speed are obtained, the current working condition is determined based on the throttle position and the engine speed, and the calibration output torque T of the current working condition is obtained by looking up the working condition-torque MAP of the original exhaust valve row line strategy tq 。
Furthermore, the working condition-torque MAP of the original exhaust valve row line strategy is obtained in the following mode: and controlling the exhaust valve by using the original exhaust valve row line strategy, and recording the output torque of the engine under each working condition to obtain a working condition-torque MAP (MAP) corresponding to the original exhaust valve row line strategy.
Further, in step S3, λ is 0.9.
Further, in step S3, the preset optimal angle value under the current working condition is obtained by looking up the EEVO calibration MAP, and the EEVO calibration MAP is obtained by the following method: under different working conditions, let (T' tq /T tq ) And (3) delaying the early opening angle of the exhaust valve according to different angle values to obtain the optimal angle values corresponding to different working conditions, and establishing an EEVO calibration MAP.
A computer storage medium having stored thereon an executable computer program which, when executed, implements a cold start exhaust gas thermal management based exhaust valve control method as described above.
Compared with the prior art, the method has the advantages that cold start valve control is switched on and off by monitoring the inlet temperature of the post-processing system in real time, the exhaust valve is controlled by using an EEVO strategy in the cold start process of the engine, the predicted output torque is calculated in real time according to the pressure in the cylinder and the mechanical efficiency of the current working condition, if the predicted output torque is lower than the calibrated output torque to a certain degree, the EEVO strategy is considered to cause insufficient engine dynamic property, and the early opening of the exhaust valve under the EEVO strategy is delayed; the method and the device can balance the dynamic property and the exhaust temperature of the engine, can flexibly adjust the torque and temperature balance relation between the dynamic property and the exhaust heat management in the actual operation process of the engine, and can ensure that the dynamic property is not excessively reduced while the cold start exhaust temperature is improved to the maximum extent.
In addition, the invention establishes an EEVO calibration MAP in advance, determines the optimal angle value under each working condition through testing, can directly obtain the optimal angle value according to the current working condition table look-up if the engine power is insufficient during real vehicle control, has high speed, can delay the early opening angle of the exhaust valve according to the optimal angle value of the current working condition, can more accurately adjust the exhaust valve, and balances the engine dynamic property and the exhaust temperature.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
the inlet temperature of the aftertreatment system is monitored in real time through a temperature sensor arranged at the inlet of the aftertreatment system, if the inlet temperature is smaller than a preset temperature threshold value, the exhaust valve control method based on cold start exhaust heat management is used for controlling the exhaust valve, if the inlet temperature is not smaller than the temperature threshold value, the cold start is finished, and the exhaust valve is controlled by switching to an original exhaust valve row line strategy.
An exhaust valve control method based on cold start exhaust gas thermal management, for controlling an exhaust valve when an inlet temperature of an aftertreatment system is less than a preset temperature threshold, as shown in fig. 1, comprises the following steps:
s1, obtaining an initial EEVO crankshaft wrap angle
Figure GDA0003832620980000041
For exhaust wrap angle based on original exhaust valve row line strategy
Figure GDA0003832620980000042
The exhaust valve start early opening advance angle;
s2, obtaining the current working condition of the engine, and increasing the early opening angle of the exhaust valve by using an EEVO strategy;
s3, calculating the currentPredicted output torque T 'of engine under working condition' tq Obtaining the calibration output torque T of the engine under the current working condition when the original exhaust valve row line strategy is used for controlling the exhaust valve tq λ ranges from (0,1), if T' tq ＜(λ×T tq ) And then output torque T 'is predicted' tq And (5) if the engine dynamic performance is insufficient, postponing the early opening angle of the exhaust valve according to the preset optimal angle value under the current working condition, and repeating the step (S3), otherwise, if the engine dynamic performance is normal, repeating the step (S2).
A computer storage medium having stored thereon an executable computer program which, when executed, implements a cold start exhaust gas thermal management based exhaust valve control method as above.
As shown in fig. 1, in the actual vehicle control, the engine is started at idle speed, the temperature of the exhaust gas is not high, and the intake and exhaust heat management can be realized through a cold-start exhaust valve control strategy, so that the exhaust temperature can be increased to the maximum extent possible. During the cold start, whether the inlet temperature of the aftertreatment system reaches a preset temperature threshold can be detected through closed-loop control, so that whether the cold start exhaust valve control is finished or not is determined. The temperature threshold is set according to the light-off temperature of the DOC in the aftertreatment system, in the embodiment, after the inlet temperature of the aftertreatment system rises to 200 ℃, the cold-start exhaust valve control is finished, and the exhaust valve is controlled by returning to the original exhaust valve row line strategy.
In the step S2, the accelerator position is obtained by the accelerator position sensor, the engine speed is obtained, and the current working condition of the engine is determined by combining the accelerator position and the engine speed, which is not described herein in detail and can be understood by practitioners in the related industries. And then the early opening angle of the exhaust valve under the current working condition is obtained by looking up a MAP (MAP of the EEVO) strategy, and the fully variable valve mechanism is controlled. The MAP of the EEVO strategy is obtained in the following manner: and (3) controlling the exhaust valve by using the EEVO strategy under various working conditions, and recording the optimal early opening angle of the exhaust valve under various working conditions to obtain a MAP (MAP of the EEVO strategy).
Prediction of output Torque T 'in step S3' tq The calculation steps are as follows:
the position of the accelerator is obtained by an accelerator position sensor,obtaining the engine speed, determining the current working condition based on the accelerator position and the engine speed, and looking up a working condition-mechanical efficiency MAP graph to obtain the current mechanical efficiency eta based on the current working condition m The predicted output torque T 'is calculated according to the following formula' tq ：
Figure GDA0003832620980000051
Figure GDA0003832620980000052
Figure GDA0003832620980000053
Wherein, P mi Representing the mean indicated pressure, P representing the in-cylinder pressure, P being obtained in real time by means of a pressure sensor installed in the engine cylinder, V s The cylinder volume of the engine, dV represents the differential of the engine cylinder volume, n represents the engine speed, i represents the number of engine cylinders, τ represents the number of strokes, in this embodiment the engine is a four-stroke engine, τ has a value of 4. The working condition-mechanical efficiency MAP is obtained in the following mode: mechanical efficiency of the engine under different working conditions is recorded to obtain a working condition-mechanical efficiency MAP, which is not described herein and can be understood by practitioners in the relevant industries.
Therefore, in the real vehicle control, the mechanical efficiency eta is determined according to the current working condition table look-up m The obtained real-time in-cylinder pressure P and the mechanical efficiency eta m Substituting calculation to obtain predicted output torque T' tq 。
The method comprises the steps that the in-cylinder pressure corresponds to one cycle of the engine, the calculation of the predicted output torque corresponds to one cycle of the engine, the predicted output torque is calculated once after each engine cycle, and the predicted output torque is compared with the calibrated output torque of the current working condition to judge whether the early opening angle of the late exhaust valve needs to be pushed down under the EEVO strategy.
S3, obtaining the current throttle position and the engine speed, determining the current working condition based on the throttle position and the engine speed, and obtaining the calibration output torque T of the current working condition by looking up a working condition-torque MAP chart of an original exhaust valve row line strategy tq . The working condition-torque MAP of the original exhaust valve row line strategy is obtained in the following mode: and controlling the exhaust valve by using the original exhaust valve row line strategy, and recording the output torque of the engine under each working condition to obtain a working condition-torque MAP (MAP) corresponding to the original exhaust valve row line strategy.
Since the EEVO strategy is used, the early opening of the exhaust valve can affect the dynamic property of the engine, namely the output torque is reduced, and the calibrated output torque T tq Is the engine's intended output torque when the EEVO strategy is not used. Therefore, the current predicted output torque is calculated in combination with the in-cylinder pressure and the mechanical efficiency of the current operating condition, and the predicted output torque and the calibrated output torque are compared to judge the degree of degradation of the engine dynamic property.
In step S3, the value of lambda is 0.9, namely T' tq ＜90％×T tq The engine power is considered to be insufficient. In fact, the EEVO strategy is to ensure that the exhaust temperature is high, open the exhaust valve early, increase the early opening angle of the exhaust valve, reduce the expansion work in the engine cylinder, and undoubtedly reduce the dynamic property of the engine. In order to ensure that the dynamic property of the engine is not excessively reduced, a 90% threshold value is set, and when the vehicle is controlled in an actual vehicle, the engine output torque T of the current working condition is controlled by using an original exhaust valve row line strategy to control the exhaust valve tq Is taken as reference, when T' tq ≥90％×T tq And considering that the dynamic property of the engine is normal, keeping the current EEVO wrap angle range, and continuously using the EEVO strategy to control the exhaust valve, otherwise, considering that the early opening of the exhaust valve under the EEVO strategy influences the dynamic property of the engine, and postponing the early opening angle of the exhaust valve.
And S3, postponing the early opening angle of the exhaust valve according to the preset optimal angle value under the current working condition, wherein the preset optimal angle value under the current working condition is obtained by calibrating an EEVO through a MAP (MAP for reference). Each delay by a certain angle has an effect on the performance of the engine, and therefore for a particular engine product,firstly, carrying out basic experiment test, and enabling (T 'to be in different working conditions' tq /T tq ) And (3) delaying the early opening angle of the exhaust valve according to different angle values, and recording the performance change of the engine, so as to obtain the optimal angle values corresponding to different working conditions of the engine and obtain an EEVO calibration MAP of the engine, which is not described in detail herein and can be understood by practitioners in relevant industries.
During actual vehicle control, the optimal angle value of each working condition is determined through table lookup, and the early opening angle of the exhaust valve is delayed according to the optimal angle value in one cycle, so that the detailed description is omitted, and practitioners in related industries can understand the optimal angle value.
After the early opening angle of the exhaust valve is postponed, the in-cylinder pressure is obtained in real time to calculate predicted output torque T' tq If the engine is still not sufficiently dynamic, i.e. T' tq ＜90％×T tq And if not, controlling the early opening of the exhaust valve according to the EEVO strategy.
In the exhaust valve control process, the inlet temperature of the post-treatment system is monitored in real time through closed-loop control, if the inlet temperature reaches 200 ℃, cold start EEVO control is ended, and the exhaust valve is controlled by using an original exhaust valve row line strategy.
Compared with fixed valve lift timing arrangement, the variable valve technology of the diesel engine is a technology capable of giving full play to energy conservation and emission reduction potential under partial load of the diesel engine, particularly a diesel engine air intake and exhaust system control strategy based on fully variable valve design is expected to be carried on the diesel engine in the future, and EEVO-based exhaust heat management needs a core control technology to adjust the current EEVO strategy due to the existence of a balance relation between dynamic performance and exhaust temperature improvement to be solved.
According to the invention, the EEVO strategy is used for controlling the exhaust valve in the cold starting process of the engine, the predicted output torque is calculated in real time according to the pressure in the cylinder, if the predicted output torque is lower than the calibrated output torque to a certain degree, the dynamic property of the engine is considered to be insufficient, the early opening angle of the exhaust valve is delayed, the torque and temperature balance relation between the dynamic property and the exhaust heat management in the actual operation process of the engine can be flexibly adjusted, and the dynamic property is ensured not to be excessively reduced while the cold starting exhaust temperature is improved to the maximum extent, so that the market application prospect is wide.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. An exhaust valve control method based on cold start exhaust heat management, which is used for controlling an exhaust valve when the inlet temperature of an aftertreatment system is smaller than a preset temperature threshold, and comprises the following steps:
s1, obtaining an initial EEVO crankshaft wrap angle
Figure FDA0003869411780000011
Figure FDA0003869411780000014
Exhaust wrap angle for original exhaust valve based row line strategy
Figure FDA0003869411780000012
The exhaust valve start early opening advance angle;
s2, obtaining the current working condition of the engine, and increasing the early opening angle of the exhaust valve by using an EEVO strategy;
s3, calculating the predicted output torque T 'of the engine under the current working condition' tq Obtaining the calibration output torque T of the engine under the current working condition when the original exhaust valve row line strategy is used for controlling the exhaust valve tq The value range of lambda is (0,1) if T' tq ＜(λ×T tq ) And (4) delaying the early opening angle of the exhaust valve according to the preset optimal angle value under the current working condition, and repeating the step (S3), otherwise, repeating the step (S2) when the engine dynamic is normal.
2. The exhaust valve control method based on cold-start exhaust gas thermal management according to claim 1, characterized in that the temperature threshold is set according to a light-off temperature of a DOC in an aftertreatment system.
3. The exhaust valve control method based on cold start exhaust heat management according to claim 1, characterized in that in step S2, the current throttle position and engine speed are obtained, the current working condition is determined based on the throttle position and the engine speed, and the early opening angle of the exhaust valve under the current working condition is obtained by looking up a MAP of an EEVO strategy.
4. An exhaust valve control method based on cold start exhaust gas thermal management according to claim 3, characterized in that the MAP of the EEVO strategy is obtained by: and (3) controlling an exhaust valve by using an EEVO strategy under various working conditions, and recording the optimal early opening angle of the exhaust valve under various working conditions to obtain a MAP (MAP) of the EEVO strategy.
5. The exhaust valve control method based on cold-start exhaust heat management according to claim 1, characterized in that output torque T 'is predicted in step S3' tq The calculation steps are as follows:
obtaining the current throttle position and the engine speed, determining the current working condition based on the throttle position and the engine speed, obtaining a working condition-mechanical efficiency MAP, and obtaining the current mechanical efficiency eta based on the current working condition by looking up a table m Obtaining the in-cylinder pressure of the engine, and calculating to obtain the predicted output torque T 'according to the following formula' tq ：
Figure FDA0003869411780000013
Where i represents the number of engine cylinders, P represents the in-cylinder pressure, dV represents the differential of the engine cylinder volume, and τ represents the number of strokes.
6. The exhaust valve control method based on cold start exhaust heat management of claim 1, wherein in step S3, the current throttle position and engine speed are obtained, the current working condition is determined based on the throttle position and the engine speed, and the calibration output torque T of the current working condition is obtained by looking up a working condition-torque MAP of an original exhaust valve row strategy tq 。
7. The exhaust valve control method based on cold start exhaust gas thermal management according to claim 6, characterized in that the working condition-torque MAP of the original exhaust valve row line strategy is obtained by: and controlling the exhaust valve by using the original exhaust valve row line strategy, and recording the output torque of the engine under each working condition to obtain a working condition-torque MAP (MAP) corresponding to the original exhaust valve row line strategy.
8. The exhaust valve control method based on cold start exhaust heat management according to claim 1, wherein in step S3, λ is 0.9.
9. The exhaust valve control method based on cold start exhaust heat management according to claim 1, characterized in that in step S3, the preset optimal angle value under the current operating condition is obtained by looking up an EEVO calibration MAP, and the EEVO calibration MAP is obtained by: under different working conditions, let (T' tq /T tq ) And (3) delaying the early opening angle of the exhaust valve according to different angle values to obtain the optimal angle values corresponding to different working conditions, and establishing an EEVO calibration MAP.
10. A computer storage medium having an executable computer program stored thereon, wherein the computer program, when executed, implements an exhaust valve control method according to any of claims 1-9.
CN202110640043.6A 2021-06-09 2021-06-09 Exhaust valve control method based on cold start exhaust heat management and storage medium Active CN113374583B (en)

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