CN114483288A - Control method and system for improving transient response of supercharged engine and automobile - Google Patents
Control method and system for improving transient response of supercharged engine and automobile Download PDFInfo
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- CN114483288A CN114483288A CN202210098361.9A CN202210098361A CN114483288A CN 114483288 A CN114483288 A CN 114483288A CN 202210098361 A CN202210098361 A CN 202210098361A CN 114483288 A CN114483288 A CN 114483288A
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- threshold value
- engine
- bypass valve
- control
- load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
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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
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- 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
Abstract
The invention relates to a control method and a control system for improving transient response of a supercharged engine and an automobile, wherein whether supercharging control is needed or not is judged, and if yes, the opening degree of a bypass valve is controlled by combining target supercharging pressure and exhaust flow; if not, the bypass valve is closed, and then the opening of the bypass valve is controlled according to the rotation speed and load of the engine. According to the invention, on the basis of not changing the hardware structure of the original engine and supercharger, through adjusting a control strategy, the supercharging control is carried out based on the initial state closing, the bypass valve is kept normally closed when the supercharging is not needed, the energy of exhaust gas is fully utilized, the supercharger is kept in a state with higher working capacity, so that the quick response can be realized when the supercharging is needed, the power performance of the engine is improved, and the acceleration feeling of the whole vehicle is improved.
Description
Technical Field
The invention relates to the technical field of automobile engineering, in particular to an engine technology.
Background
Slow boost response is a common problem in engine control with exhaust gas turbochargers. The root cause of the slow boost response is the insufficient ability of the turbine to do work. And the turbine work capacity depends on the energy that the exhaust gas propels the turbine. The boost control of the common electronic bypass valve supercharger is based on the bypass valve initial state complete opening control, and the common electronic bypass valve supercharger is closed when needing boost, so that partial waste gas flow is wasted, the capacity mode of the supercharger is low when the boost is carried out, and the response is slow.
The method comprises the steps of judging whether a full-supercharging mode is entered or not through rotating speed and a pedal, controlling a bypass valve to be completely closed and a throttle valve to be completely opened if full-supercharging is entered, and adjusting supercharging pressure through an intake phase; in the non-full boost mode, the bypass valve is fully opened to regulate the pressure value via the throttle valve if the target pressure is less than the basic boost pressure, and the intake pressure is regulated via the bypass valve if the target pressure is greater than the basic boost pressure. The determination as to whether the boost control is activated or not is not described, and the bypass valve state and the setting method and basis when the boost control is not activated are not described, and the method performs the action of closing the bypass valve after determining that the full boost mode is entered, and instead of performing the boost control based on the bypass valve initial state closing, the high-speed mode of the supercharger is not fully maintained by using the energy of the exhaust gas to further improve the boost response.
Therefore, none of the engine supercharger bypass valve control strategies of the prior art relates to a determination method as to whether or not the supercharging control is activated, and the supercharging control is not performed based on the idea that the bypass valve is initially closed, and the response performance of the supercharger cannot be improved by making full use of the exhaust gas flow rate.
Disclosure of Invention
One of the purposes of the invention is to provide a control method for improving transient response of a supercharged engine, so as to solve the problem that the existing supercharged engine cannot fully utilize the exhaust flow to improve the response performance of a supercharger; the second purpose is to provide a control system; the third purpose is to provide an automobile.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method for improving transient response of a supercharged engine judges whether supercharging control is needed, and if yes, the opening degree of a bypass valve is controlled by combining target supercharging pressure and exhaust flow; if not, the bypass valve is closed, and then the opening of the bypass valve is controlled according to the rotation speed and load of the engine.
According to the technical means, before the supercharging control is started, whether the supercharging control is needed or not needs to be judged, if not, the bypass valve is closed firstly, so that the bypass valve can be closed when the supercharging is not needed, partial waste gas can be saved, the use efficiency of the waste gas is improved, after the bypass valve is closed, the opening degree of the bypass valve can be controlled according to the rotating speed and the load of the engine, the supercharging capacity maintained by the supercharger is prevented from being excessive, the supercharging overshoot when the supercharging is needed is avoided, the excessive deterioration caused by the fact that the exhaust back pressure and the oil consumption of the engine are too high, the pumping loss is increased, the balance is carried out between the oil consumption and the power response, and meanwhile, the supercharging caused by the high rotating speed and the high load is avoided, and the supercharger and the engine hardware are damaged. The supercharger can therefore respond quickly also when boost control is required.
Further, the method of determining whether or not the supercharging control is required is: conditions 1 and 2 are set, where condition 1 is:
Pat present＞PTarget-P1 threshold value；
Wherein, condition 2 is:
Pat present＞P2 threshold AND PAt present＞PThreshold value
PAt presentRepresents the actual boost pressure;
PtargetRepresents a target boost pressure;
P1 threshold valueThe first threshold value is represented and can be set according to the actual condition;
P2 threshold valueThe second threshold value is represented and can be set according to actual conditions;
P′at presentA pressure rise rate representing an actual boost pressure;
P′threshold valueA pressure rise rate threshold of the boost pressure;
if either of the condition 1 or the condition 2 is satisfied, the supercharging control is required;
if neither of the conditions 1 and 2 is satisfied, the supercharging control is not required.
Further, when the supercharging control is not required, the method of controlling the opening degree of the bypass valve is: setting a first rotating speed threshold value, a second rotating speed threshold value, a first load threshold value and a second load threshold value, wherein the first rotating speed threshold value is smaller than the second rotating speed threshold value, and the first load threshold value is smaller than the second load threshold value;
when the current rotating speed of the engine is smaller than a first rotating speed threshold value and the current load of the engine is smaller than a first load threshold value, the bypass valve is completely closed;
when the current rotating speed of the engine is greater than the second rotating speed threshold value and the current load of the engine is smaller than the second load threshold value, the bypass valve is completely opened;
when the current rotating speed of the engine is between a first rotating speed threshold value and a second rotating speed threshold value and the current load of the engine is between a first load threshold value and a second load threshold value, the bypass valve is partially opened;
when the bypass valve is partially open, the opening of the bypass valve corresponds to both the current speed of the engine and the current load of the engine.
Further, at different ambient temperatures and ambient pressures, the relationship between the opening of the bypass valve and the current speed of the engine and the current load of the engine needs to be corrected.
Further, under different ambient temperatures and ambient pressures, the first rotational speed threshold, the second rotational speed threshold, the first load threshold, and the second load threshold need to be corrected.
Further, when the supercharging control is needed, the power demand ratio is calculated by combining an engine torque model and a gas model according to the target supercharging pressure, and the opening degree of the bypass valve is further obtained according to the exhaust flow.
A control system based on the control method for improving the transient response of the supercharged engine comprises the following steps:
a determination module configured to determine whether boost control is required,
a first control module configured to control an opening degree of the bypass valve in combination with a target supercharging pressure and an exhaust flow rate when supercharging control is required;
and a second control module configured to close the bypass valve and then control the opening of the bypass valve according to the rotation speed and the load of the engine when the supercharging control is not required.
An automobile comprises an automobile body, wherein the automobile body comprises the control system.
The invention has the beneficial effects that:
according to the invention, on the basis of not changing the hardware structure of the original engine and supercharger, through adjusting a control strategy, the supercharging control is carried out based on the initial state closing, the bypass valve is kept normally closed when the supercharging is not needed, the energy of exhaust gas is fully utilized, the supercharger is kept in a state with higher working capacity, so that the quick response can be realized when the supercharging is needed, the power performance of the engine is improved, and the acceleration feeling of the whole vehicle is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art engine with a supercharger;
FIG. 2 is a flow chart of the present invention.
Wherein, 1-an engine control unit; 2-an engine; 3-a turbocharger; 4-a bypass valve.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The embodiment provides a control method for improving transient response of a supercharged engine, which is based on the structure of the existing supercharged engine and comprises an engine control unit 1, an engine 2, a supercharger 3 and a bypass valve 4 as shown in FIG. 1.
The control method is shown in fig. 2, and specifically comprises the following steps:
s1: whether or not the supercharging control is required is determined by the following method, wherein the supercharging control is interpreted as: in order to meet the requirement of supercharging, the opening degree of the bypass valve needs to be controlled so that the actual supercharging pressure can be increased to the target supercharging pressure at a certain rate, and whether supercharging control is required or not is specifically determined,
Pat present＞PTarget-P1 threshold value；
Wherein, condition 2 is:
Pat present＞P2 threshold AND PAt present＞PThreshold value
PAt presentRepresents the actual boost pressure;
PtargetRepresents a target boost pressure;
P1 threshold valueThe first threshold value is represented and can be set according to the actual condition;
P2 threshold valueThe second threshold value is represented and can be set according to actual conditions;
P′at presentA pressure rise rate representing an actual boost pressure;
P′threshold valueA pressure rise rate threshold of the boost pressure;
the target boost pressure, the first threshold value and the second threshold value need to be set reasonably, overshoot is easily caused when the first threshold value or the second threshold value is too small, and boost is activated prematurely when the first threshold value or the second threshold value is too large, so that boost gain caused by closing of the bypass valve cannot be fully utilized. The actual boost pressure rise rate limit is also a consideration to avoid excessive boost overshoot.
If one of the condition 1 and the condition 2 is met, performing boost control, namely increasing the actual boost pressure to a target boost pressure at a certain speed, specifically, calculating a power demand ratio by combining an engine torque model and a gas model according to the target boost pressure, and further obtaining the opening of the bypass valve according to the exhaust flow;
if neither of the conditions 1 and 2 is satisfied, the supercharging control is not necessary, and it is necessary to close the bypass valve first and then control the opening degree of the bypass valve in accordance with the rotation speed and load of the engine. A specific method of controlling the opening degree of the bypass valve in accordance with the engine speed and load is:
firstly, a three-dimensional table of the rotating speed of the engine, the load of the engine and the opening of the bypass valve needs to be calibrated, the three tables correspond to one another, namely, a specific bypass valve opening corresponding to the rotating speed and the load of the engine can be found out according to the three-dimensional table, the three-dimensional table needs to consider different environmental temperatures and environmental pressures, the three-dimensional table can be corrected under different environmental temperatures and environmental pressures, and data of the three-dimensional table is input into the engine control unit 1.
Setting a first rotating speed threshold value, a second rotating speed threshold value, a first load threshold value and a second load threshold value, wherein the first rotating speed threshold value is smaller than the second rotating speed threshold value, and the first load threshold value is smaller than the second load threshold value;
when the current rotating speed of the engine is smaller than the first rotating speed threshold value and the current load of the engine is smaller than the first load threshold value, the bypass valve is completely closed, so that the exhaust gas is discharged after completely flowing through the turbine, the energy of the exhaust gas is fully utilized, and the higher response level of the supercharger is maintained.
When the current rotating speed of the engine is greater than the second rotating speed threshold value and the current load of the engine is smaller than the second load threshold value, the bypass valve is completely opened, and the problems that the supercharge is caused when the engine is in high rotating speed and high load, and the supercharger and the engine hardware are damaged are avoided.
When the current rotating speed of the engine is between a first rotating speed threshold value and a second rotating speed threshold value, and the current load of the engine is between a first load threshold value and a second load threshold value, the bypass valve is partially opened, so that part of the exhaust gas is exhausted through the supercharger, the higher response capacity of the supercharger is maintained by utilizing the part of the exhaust gas energy flowing through the supercharger, and meanwhile, part of the exhaust gas is directly exhausted through the bypass valve, so that the situation that the supercharging capacity maintained by the supercharger is excessive at the moment to cause supercharging overshoot when supercharging is needed is avoided, the situation that the exhaust back pressure of the engine is too high, the pumping loss is increased, the excessive deterioration of the oil consumption is caused is also avoided, and the balance is carried out between the oil consumption and the power response. The opening of the bypass valve at this time is based on a three-dimensional table, i.e., the opening of the bypass valve is related to the current speed and the current load of the engine.
Because the density of the gas is different at different temperatures and altitudes, the first rotating speed threshold value, the second rotating speed threshold value, the first load threshold value, the second load threshold value and the three-dimensional table should be corrected at different ambient temperatures and pressures for the purpose of fully utilizing the energy of the exhaust gas and simultaneously avoiding the rotating speed of the supercharger from exceeding the limit value and protecting the hardware of the supercharger.
The core idea of the control method in the embodiment is that through the judgment of whether the pressurization needs to be controlled, on the premise of ensuring the hardware safety and the control stability, the exhaust gas flows through the supercharger to do work as much as possible, the energy of the exhaust gas is fully utilized, the rotating speed of the supercharger is maintained at a higher level, the pressurization capacity of the supercharger is in a higher state, and the pressurization response is improved to the greatest extent. The control method also avoids the deterioration of the oil consumption caused by the over-pressurization caused by excessive exhaust gas flowing through the turbine and the sharp increase of the exhaust back pressure. Through reasonable use of the comparison method, the supercharging response is improved to the maximum extent under the conditions of not changing the hardware state and extremely reducing the oil consumption, so that the response capability of the engine is improved, the acceleration performance of the whole vehicle is improved, the requirement of a customer on the power response is met, and the supercharging delay is eliminated to the maximum extent.
The embodiment also provides a control system based on the control method for improving the transient response of the supercharged engine, which comprises the following steps: a determination module configured to determine whether or not supercharging control is required, a first control module configured to control an opening degree of the bypass valve in conjunction with a target supercharging pressure and an exhaust gas flow rate when supercharging control is required; and a second control module configured to close the bypass valve and then control the opening of the bypass valve according to the rotation speed and the load of the engine when the supercharging control is not required.
The embodiment also provides an automobile which comprises an automobile body, wherein the automobile body comprises the control system.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (8)
1. A control method for improving transient response of a supercharged engine, characterized by:
determining whether boost control is required, and if so, controlling the opening degree of the bypass valve by combining the target boost pressure and the exhaust flow; if not, the bypass valve is closed, and then the opening of the bypass valve is controlled according to the rotation speed and load of the engine.
2. The control method for improving transient response of a supercharged engine of claim 1, characterized in that: the method for determining whether the supercharging control is required is as follows: conditions 1 and 2 are set, where condition 1 is:
Pat present＞PTarget-P1 threshold value；
Wherein, condition 2 is:
Pat present＞P2 threshold value AND PAt present＞PThreshold value
PAt presentRepresents the actual boost pressure;
PtargetRepresents a target boost pressure;
P1 threshold valueThe first threshold value is represented and can be set according to the actual condition;
P2 threshold valueThe second threshold value is represented and can be set according to actual conditions;
P’at presentA pressure rise rate representing an actual boost pressure;
P’threshold valueA pressure rise rate threshold of the boost pressure;
if either of the condition 1 or the condition 2 is satisfied, the supercharging control is required;
if neither of the conditions 1 and 2 is satisfied, the supercharging control is not required.
3. The control method for improving transient response of a supercharged engine of claim 2, characterized in that: when the supercharging control is not required, the method for controlling the opening degree of the bypass valve comprises the following steps: setting a first rotating speed threshold value, a second rotating speed threshold value, a first load threshold value and a second load threshold value, wherein the first rotating speed threshold value is smaller than the second rotating speed threshold value, and the first load threshold value is smaller than the second load threshold value;
when the current rotating speed of the engine is smaller than a first rotating speed threshold value and the current load of the engine is smaller than a first load threshold value, the bypass valve is completely closed;
when the current rotating speed of the engine is greater than the second rotating speed threshold value and the current load of the engine is smaller than the second load threshold value, the bypass valve is completely opened;
when the current rotating speed of the engine is between a first rotating speed threshold value and a second rotating speed threshold value and the current load of the engine is between a first load threshold value and a second load threshold value, the bypass valve is partially opened;
when the bypass valve is partially open, the opening of the bypass valve corresponds to both the current speed of the engine and the current load of the engine.
4. The control method for improving transient response of a supercharged engine of claim 3, characterized in that: under different ambient temperatures and ambient pressures, the relationship between the opening of the bypass valve and the current speed of the engine and the current load of the engine needs to be corrected.
5. The control method for improving transient response of a supercharged engine of claim 4, characterized in that: under different ambient temperatures and ambient pressures, the first rotational speed threshold, the second rotational speed threshold, the first load threshold, and the second load threshold need to be corrected.
6. The control method for improving transient response of a supercharged engine of claim 1, characterized in that: when the supercharging control is needed, the power demand ratio is calculated by combining an engine torque model and a gas model according to the target supercharging pressure, and the opening degree of the bypass valve is further obtained according to the exhaust flow.
7. A control system based on the control method for improving transient response of a supercharged engine of any one of claims 1-6, characterized by comprising:
a determination module configured to determine whether boost control is required,
a first control module configured to control an opening degree of the bypass valve in combination with a target supercharging pressure and an exhaust flow rate when supercharging control is required;
and a second control module configured to close the bypass valve and then control the opening of the bypass valve according to the rotation speed and the load of the engine when the supercharging control is not required.
8. An automobile, comprising a body, characterized in that: the vehicle body includes the control system of claim 7.
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| CN202210098361.9A CN114483288B (en) | 2022-01-27 | 2022-01-27 | Control method and system for improving transient response of supercharged engine and automobile |
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| CN202210098361.9A CN114483288B (en) | 2022-01-27 | 2022-01-27 | Control method and system for improving transient response of supercharged engine and automobile |
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| CN107740723A (en) * | 2017-10-27 | 2018-02-27 | 福州大学 | Two stage turbocharging system and test method |
| JP2019178639A (en) * | 2018-03-30 | 2019-10-17 | マツダ株式会社 | Control device for compression ignition type engine |
| CN111691967A (en) * | 2019-03-13 | 2020-09-22 | 上海汽车集团股份有限公司 | Two-stage supercharger and engine |
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2022
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| JPH1130126A (en) * | 1997-07-11 | 1999-02-02 | Nissan Diesel Motor Co Ltd | Air charge amount controller of supercharging internal combustion engine |
| JP2000045829A (en) * | 1998-07-27 | 2000-02-15 | Mazda Motor Corp | Control device for engine having mechanical supercharger |
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