CN107829835B - Turbocharging engine supercharging pressure limiting value control method - Google Patents
Turbocharging engine supercharging pressure limiting value control method Download PDFInfo
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- CN107829835B CN107829835B CN201711022277.4A CN201711022277A CN107829835B CN 107829835 B CN107829835 B CN 107829835B CN 201711022277 A CN201711022277 A CN 201711022277A CN 107829835 B CN107829835 B CN 107829835B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 230000007613 environmental effect Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
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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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Abstract
The invention discloses a method for controlling the limit value of the boost pressure of a turbocharged engine, wherein the limit value of the boost pressure of the turbocharged engine comprises a maximum boost pressure limit value and a minimum boost pressure limit value; the maximum boost pressure limit: the maximum boost pressure limit value obtained by the engine torque or the maximum boost pressure limit value determined by the supercharger characteristics is taken as the maximum boost pressure limit value of the supercharger when the maximum boost pressure limit value is taken as the maximum boost pressure limit value of the supercharger; the minimum boost pressure limit is the pressure value after the filtration pressure drop. The control method of the invention adds the signal for calculating the virtual turbine sensor, and can increase the pressure ratio to the maximum extent and explore the power performance of the supercharger according to the turbine rotating speed signal under the condition of ensuring that each signal is in a safe range.
Description
Technical Field
The invention relates to the field of automobile electronic control, in particular to a method for calculating a supercharging pressure limit value of a turbocharged engine.
Background
At present, a widely used supercharging mode of a gasoline supercharger for a passenger vehicle is turbocharging. In order to reduce the moment of inertia and improve the responsiveness of boost pressure, miniaturization is generally advanced. In the case of a small supercharger, the pressure ratio of the supercharger must be within a reasonable range in order to prevent surging, clogging, etc. of the supercharger. Therefore, the limit of the maximum boost pressure should be taken into account in the design of the control strategy.
In practical applications, the supercharger is often protected to the maximum extent. The supercharger cannot exert the maximum supercharging pressure, and the performance of the supercharger is reduced. Therefore, an effective method for calculating the limit value of the boost pressure is needed, which can not only protect the supercharger and ensure the service life of the supercharger, but also play a role in higher boost performance.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a control method which not only exerts the performance of a supercharger to the maximum extent, but also ensures the driving safety, and can prevent faults such as overhigh temperature after pressure, over-limit temperature after vortex, detonation, surge and the like.
In order to achieve the purpose, the invention adopts the technical scheme that: the method comprises the steps of controlling the supercharging pressure limit value of the turbocharged engine, wherein the supercharging pressure limit value of the turbocharged engine comprises a maximum supercharging pressure limit value and a minimum supercharging pressure limit value;
the maximum boost pressure limit: the maximum boost pressure limit value obtained by the engine torque or the maximum boost pressure limit value determined by the supercharger characteristics is taken as the maximum boost pressure limit value of the supercharger when the maximum boost pressure limit value is taken as the maximum boost pressure limit value of the supercharger;
the minimum boost pressure limit is the pressure value after the filtration pressure drop.
The method for maximum boost pressure limit derived from engine torque includes:
1-1) judging whether the VVT has an enabling fault, if so, looking up a table to obtain the maximum torque in the initial state of the VVT, and if not, looking up the table to obtain the maximum torque in the enabling state of the VVT;
1-2) obtaining the optimal external characteristic torque by dividing the maximum torque obtained by table lookup by the firing angle efficiency and the Lambda efficiency;
1-3) obtaining the maximum load by looking up a table of the optimal external characteristic torque and the engine rotating speed;
1-4) the maximum boost pressure derived from the engine torque is derived from the maximum load.
In the step 1-3), the maximum load is determined according to the fault condition of the electronic water pump, if the electronic water pump has no fault, the required maximum load is the maximum load obtained by looking up a table in the step 1-3), and if the electronic water pump has fault, the required maximum load is the maximum load obtained by looking up a table in the step 1-3) multiplied by a correction coefficient, wherein the correction coefficient is obtained by looking up a table through the rotating speed of the engine.
In the step 1-4), the turbocharging control system reversely deduces the required intake pressure according to the required intake air quantity, wherein the pressure conversion coefficient and the participated exhaust pressure are obtained by the ECU table look-up, and the maximum boost pressure obtained by the engine torque is obtained through the maximum load reverse deduction in the step 1-3).
The method of maximum boost pressure limit determined by supercharger characteristics includes:
2-1) obtaining the maximum boost pressure of the supercharger according to the known surge line and blocking line boost pressure ratio at the supercharger model selection stage;
2-2) calculating the obtained turbine rotating speed according to the simulated turbine rotating speed model, and looking up a table by using the turbine rotating speed to obtain the maximum supercharging pressure of the supercharger;
2-3), taking the two maximum supercharging pressures obtained in the 2-1) and the 2-2) to be large values, namely the maximum supercharging pressure obtained by the characteristics of the supercharger.
The method of calculating the minimum boost pressure limit includes:
3-1) determining whether the environmental pressure sensor fails, if so, using a substitute value for the environmental pressure, and if not, taking the environmental pressure as a sensor measurement value;
3-2) obtaining an air filter pressure drop value by looking up a table through the flow rate of inlet air;
3-3) subtracting the air filtration pressure drop value from the ambient pressure value to obtain a pressure value after air filtration;
3-4) the pressure value after air filtration is the minimum boost pressure limit value.
An automobile with a turbo-charged engine comprises the turbo-charged engine and a turbo-charging control system, wherein the turbo-charging control system adopts the turbo-charged engine boost pressure limit value control method.
The control method of the invention adds the signal for calculating the virtual turbine sensor, and can increase the pressure ratio to the maximum extent and explore the power performance of the supercharger according to the turbine rotating speed signal under the condition of ensuring that each signal is in a safe range.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a schematic diagram of calculating a maximum boost pressure based on an engine external characteristic torque;
FIG. 2 is a schematic diagram of the calculation of maximum boost pressure based on turbocharger characteristics;
FIG. 3 is a schematic diagram of calculating a maximum boost pressure limit;
FIG. 4 is a schematic diagram of calculating a minimum boost pressure limit.
Detailed Description
The control method of the invention combines a plurality of working conditions for limiting the boost pressure and comprehensively provides the calculation logic for finally limiting the boost pressure. There are many limits that affect boost pressure: including supercharger body performance such as surge line, choke line, maximum speed limit; including the intake air temperature; a maximum torque limit; VVT function, etc. According to the difference of the engine to the required boost pressure under each working condition, an effective maximum boost pressure limit value calculation method can be adopted, and the specific method is as follows:
specifically, calculating a turbocharged engine boost pressure limit includes two aspects, a maximum boost pressure limit and a minimum boost pressure limit, and the maximum boost pressure limit also includes two aspects, one being the maximum boost pressure limit derived from engine torque and the other being the maximum boost pressure limit determined by supercharger characteristics. The minimum value of the two is the maximum supercharging pressure limit value of the supercharger, and the minimum supercharging pressure limit value is the pressure value after the air filtering pressure is reduced.
1. The method for calculating the maximum boost pressure according to the external characteristic torque of the engine comprises the following steps:
first, it is determined whether the VVT has an enable failure. If the fault exists, the maximum torque in the VVT initial state is obtained by looking up a table. If no fault exists, the maximum torque in the VVT enabling state is obtained by looking up a table. The maximum torque from the lookup table is then divided by the firing angle efficiency and Lambda efficiency to obtain the optimum extrinsic torque. And then the maximum load is obtained by looking up a table of the optimal external characteristic torque and the engine rotating speed.
And then judging whether the electronic water pump has faults or not. If there is no fault, the maximum load is the maximum load obtained by the above lookup table. If there is a fault, the maximum load required is the maximum load obtained from the table lookup, multiplied by a correction factor. The correction factor is obtained by looking up a table of the engine speed.
Because the linear relation exists between the intake pressure and the intake air quantity, the turbocharging control system reversely deduces the required intake pressure according to the required intake air quantity, wherein the pressure conversion coefficient and the participated exhaust pressure are obtained by the ECU through table lookup. That is, the maximum boost pressure obtained from the engine torque can be reversely derived from the obtained maximum load.
2. Method for calculating the maximum boost pressure from the turbocharger characteristics:
firstly, the maximum boost pressure of the supercharger is obtained according to the known surge line and choke line boost pressure ratio in the supercharger model selection stage. And then, according to the turbine rotating speed obtained by calculating the simulated turbine rotating speed model, the maximum supercharging pressure of the supercharger is obtained by looking up a table by using the turbine rotating speed. Since the surge line to choke line pressure ratio is smaller than the pressure ratio given by the supercharger characteristics in the actual application stage, the two maximum supercharging pressures are larger values, that is, the maximum supercharging pressure obtained by the supercharger characteristics.
3. Method of calculating minimum boost pressure limit:
and the minimum boost pressure limit value is the pressure value after air filtering of the air inlet system. And the pressure value after air filtration is the ambient pressure value minus the air filtration pressure drop value. The air filtering pressure drop value is obtained by looking up a table through the air intake flow, whether an environmental pressure sensor fails or not is firstly confirmed when the environmental pressure is calculated, and if the environmental pressure fails, a substitute value is used; if not, the environmental pressure is the measured value of the sensor.
In FIGS. 1-4, the variables are:
the invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (4)
1. The method for controlling the supercharging pressure limit value of the turbocharged engine is characterized in that the supercharging pressure limit value of the turbocharged engine comprises a maximum supercharging pressure limit value and a minimum supercharging pressure limit value;
the maximum boost pressure limit: the maximum boost pressure limit value obtained by the engine torque or the maximum boost pressure limit value determined by the supercharger characteristics is taken as the maximum boost pressure limit value of the supercharger when the maximum boost pressure limit value is taken as the maximum boost pressure limit value of the supercharger;
the minimum boost pressure limit value is a pressure value after air filtration pressure drop;
the method for maximum boost pressure limit derived from engine torque includes:
1-1) judging whether the VVT has an enabling fault, if so, looking up a table to obtain the maximum torque in the initial state of the VVT, and if not, looking up the table to obtain the maximum torque in the enabling state of the VVT;
1-2) obtaining the optimal external characteristic torque by dividing the maximum torque obtained by table lookup by the firing angle efficiency and the Lambda efficiency;
1-3) obtaining the maximum load by looking up a table of the optimal external characteristic torque and the engine rotating speed;
1-4) obtaining the maximum boost pressure obtained by the engine torque through the maximum load;
the method of maximum boost pressure limit determined by supercharger characteristics includes:
2-1) obtaining the maximum boost pressure of the supercharger according to the known surge line and blocking line boost pressure ratio at the supercharger model selection stage;
2-2) calculating the obtained turbine rotating speed according to the simulated turbine rotating speed model, and looking up a table by using the turbine rotating speed to obtain the maximum supercharging pressure of the supercharger;
2-3), taking the two maximum supercharging pressures obtained in the 2-1) and the 2-2) to be large values, namely the maximum supercharging pressure obtained by the characteristics of the supercharger;
the method of calculating the minimum boost pressure limit includes:
3-1) determining whether the environmental pressure sensor fails, if so, using a substitute value for the environmental pressure, and if not, taking the environmental pressure as a sensor measurement value;
3-2) obtaining an air filter pressure drop value by looking up a table through the flow rate of inlet air;
3-3) subtracting the air filtration pressure drop value from the ambient pressure value to obtain a pressure value after air filtration;
3-4) the pressure value after air filtration is the minimum boost pressure limit value.
2. The turbocharged engine boost pressure limit control of claim 1, wherein: in the step 1-3), the maximum load is determined according to the fault condition of the electronic water pump, if the electronic water pump has no fault, the required maximum load is the maximum load obtained by looking up a table in the step 1-3), and if the electronic water pump has fault, the required maximum load is the maximum load obtained by looking up a table in the step 1-3) multiplied by a correction coefficient, wherein the correction coefficient is obtained by looking up a table through the rotating speed of the engine.
3. The turbocharged engine boost pressure limit control of claim 2, wherein: in the step 1-4), the turbocharging control system reversely deduces the required intake pressure according to the required intake air quantity, wherein the pressure conversion coefficient and the participated exhaust pressure are obtained by the ECU table look-up, and the maximum boost pressure obtained by the engine torque is obtained through the maximum load reverse deduction in the step 1-3).
4. An automobile with a turbocharged engine, the automobile comprising the turbocharged engine and a turbocharging control system, characterized in that: the turbocharging control system adopts the turbocharging pressure limit control method of any one of claims 1-3.
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| CN201711022277.4A CN107829835B (en) | 2017-10-27 | 2017-10-27 | Turbocharging engine supercharging pressure limiting value control method |
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| CN201711022277.4A CN107829835B (en) | 2017-10-27 | 2017-10-27 | Turbocharging engine supercharging pressure limiting value control method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635451A (en) * | 2012-04-26 | 2012-08-15 | 潍柴动力股份有限公司 | Control method of protecting turbosuperchager |
| CN103485906A (en) * | 2012-06-12 | 2014-01-01 | 马涅蒂-马瑞利公司 | Method for controlling an internal combustion engine |
| CN105041489A (en) * | 2015-08-17 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Engine supercharge control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IN2009KN02408A (en) * | 2006-12-21 | 2015-08-07 | Borgwarner Inc |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635451A (en) * | 2012-04-26 | 2012-08-15 | 潍柴动力股份有限公司 | Control method of protecting turbosuperchager |
| CN103485906A (en) * | 2012-06-12 | 2014-01-01 | 马涅蒂-马瑞利公司 | Method for controlling an internal combustion engine |
| CN105041489A (en) * | 2015-08-17 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Engine supercharge control method and device |
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