CN115045764A - Control system and control method for engine compression ratio - Google Patents
Control system and control method for engine compression ratio Download PDFInfo
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- CN115045764A CN115045764A CN202210724129.1A CN202210724129A CN115045764A CN 115045764 A CN115045764 A CN 115045764A CN 202210724129 A CN202210724129 A CN 202210724129A CN 115045764 A CN115045764 A CN 115045764A
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- engine
- compression ratio
- control unit
- bypass
- control system
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Classifications
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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
- F02D15/00—Varying compression ratio
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
Abstract
The invention discloses a control system and a control method for an engine compression ratio. The control system of the engine compression ratio comprises an engine control unit and a bypass control unit which are in communication connection, wherein the engine control unit is used for controlling the engine to run under the fixed compression ratio; the bypass control unit is used for reading engine operation data, judging whether to switch the compression ratio, transmitting a compression ratio switching instruction and judging whether to complete the compression ratio switching. The control method of the engine compression ratio comprises the following steps: the engine is operated at a first compression ratio; the bypass control unit monitors real-time data of the operation of the engine and judges whether the compression ratio is switched or not, if so, the bypass control unit sends a switching instruction, and the engine control unit controls the engine to switch the compression ratio from the first compression ratio to the second compression ratio. The invention adopts an external bypass control unit, controls the compression ratio of the engine through information interaction between the external bypass control unit and the engine control unit, and has simpler control logic.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a control system and a control method for an engine compression ratio.
Background
The variable compression ratio technique is a technique of dynamically adjusting the compression ratio of an engine. According to different working conditions of the engine, the most appropriate compression ratio is selected and adopted, so that good thermal efficiency can be obtained; through calibration optimization, the engine can take the economy and the dynamic property into consideration. The existing continuous variable compression ratio technology can provide a plurality of compression ratios, so that the engine can be matched with a proper compression ratio under each working condition, but the calibration work brought by the plurality of compression ratios is increased by times, the control strategy of the compression ratios is more complicated, and the system stability is influenced due to the bad operation.
Therefore, it is desirable to provide a control system and a control method for the compression ratio of an engine.
Disclosure of Invention
The invention aims to provide a control system and a control method for an engine compression ratio, and aims to solve the problems of long calibration period and complex control method caused by the use of a continuous variable compression ratio technology in the prior art.
In order to realize the purpose, the following technical scheme is provided:
the control system of the engine compression ratio comprises an engine control unit and a bypass control unit which are in communication connection, wherein the engine control unit is used for controlling the engine to run under a fixed compression ratio; the bypass control unit is used for reading the running data of the engine fed back by the engine control unit, judging whether to switch the compression ratio, transmitting a compression ratio switching instruction to the engine control unit and judging whether to complete the compression ratio switching.
As an alternative to the above-described control system for the compression ratio of the engine, the bypass control unit is further configured to control an ignition angle, an injection amount, and a throttle opening of the engine.
As an alternative to the above-mentioned control system of the engine compression ratio, the control system is controlled by the bypass control unit.
As an alternative to the above-described control system of the engine compression ratio, the control system is controlled by the engine control unit.
As an alternative to the above control system for the compression ratio of the engine, the bypass control unit is integrated with a second data packet for controlling the engine during the switching of the compression ratio; and a first data packet for controlling the engine to operate under a fixed compression ratio is integrated in the engine control unit.
As an alternative to the above-described control system of the engine compression ratio, the bypass control unit is connected to the engine control unit via a data line.
A control method of a control system adopting the engine compression ratio comprises the following steps:
s100: the engine control unit controls the engine to operate at a first compression ratio;
s200: the bypass control unit monitors real-time data of the engine operation fed back by the engine control unit and judges whether compression ratio switching is carried out or not, if so, the next step is carried out;
s300: the bypass control unit sends a switching instruction to the engine control unit, and the engine control unit controls the engine to switch the compression ratio from a first compression ratio to a second compression ratio;
s400: the bypass control unit judges whether the switching of the compression ratio is finished according to the fed back absolute value of the difference value of the compression ratio of the last two cycles of the engine, if so, the next step is carried out, and if not, the step S200 is returned to;
s500: continuing to control operation of the engine by the engine control unit.
As an alternative to the above-described method for controlling the engine compression ratio, in step S200, if it is determined that the compression ratio is not switched, the engine control means continues to control the engine operation while keeping the engine compression ratio unchanged.
As an alternative to the above-described control method of the engine compression ratio, in step S100, the first compression ratio is one of a high compression ratio and a low compression ratio, and the second compression ratio is divided into the other of the high compression ratio and the low compression ratio.
As an alternative to the above method for controlling the compression ratio of the engine, in step S200, the real-time data of the engine operation at least comprises the rotation speed, the load and the compression ratio.
Compared with the prior art, the invention has the beneficial effects that:
the control system of the engine compression ratio provided by the invention adopts an external bypass control unit, and controls and adjusts the compression ratio of the engine through information interaction between the external bypass control unit and the engine control unit, namely, the bypass control unit controls the change of the compression ratio of the engine, and the engine control unit only needs to control the operation of the engine under a fixed compression ratio, so that the corresponding control logic is simpler; in the control method of the engine compression ratio, the calibration work is simplified by only arranging two compression ratios, the corresponding realization period is shorter, the technical cost is reduced, and the cost performance of the compression ratio control is improved.
Drawings
FIG. 1 is a schematic diagram of a control system for engine compression ratio in an embodiment of the present invention;
fig. 2 is a flowchart of a control method of the engine compression ratio in the embodiment of the invention.
Reference numerals are as follows:
10. an engine; 20. an engine control unit; 21. a second data packet; 30. a bypass control unit; 31. a first data packet; 40. and developing a computer.
Detailed Description
The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment is to provide a control system of an engine compression ratio; referring to fig. 1, the control system specifically includes an engine control unit 20 and a bypass control unit 30 communicatively connected, wherein the engine control unit 20 is configured to control the engine 10 to operate at a fixed compression ratio; the bypass control unit 30 is configured to read the operation data of the engine 10 fed back by the engine control unit 20, determine whether to perform compression ratio switching, transmit a command for compression ratio switching to the engine control unit 20, and determine whether compression ratio switching is complete.
The traditional engine compression ratio control strategy is completed based on data of an engine control unit, and can be specifically described as that the engine control unit judges whether the engine needs to change the compression ratio according to signals of torque, rotating speed, knocking and the like of the engine, and if so, the engine control unit sends a compression ratio conversion command by itself and calls relevant parameters stored in the engine control unit to control the engine to operate under a new compression ratio. The engine control unit needs to store data of a plurality of compression ratio operations, so that the data size is large, and the calibration period is long; and the engine control unit not only controls the operation of the engine under the fixed compression ratio, but also controls the compression ratio change of the engine, and the control logic is relatively complex. The control system for the engine compression ratio provided by the embodiment adopts the externally-connected bypass control unit 30, and controls and adjusts the compression ratio of the engine 10 through information interaction between the externally-connected bypass control unit 30 and the engine control unit 20, namely, the bypass control unit 30 controls the change of the compression ratio of the engine 10, and the engine control unit 20 only needs to control the engine 10 to operate under a fixed compression ratio, so that the corresponding control logic is simpler.
Further, the bypass control unit 30 is also used to control the ignition angle, the fuel injection amount, and the throttle opening of the engine 10. In specific implementation, when the compression ratio needs to be changed, the bypass control unit 30 not only sends an instruction to the engine control unit 20, but also the bypass control unit 30 can simultaneously control and adjust the relevant operating parameters of the engine 10 until the compression ratio of the engine 10 is switched to the target compression ratio; i.e. the bypass control unit 30 may assist the engine control unit 20 in accomplishing the switching between the two different compression ratios by controlling the relevant parameters of the operation of the engine 10.
Specifically, the control system of the compression ratio of the engine 10 may be controlled by the bypass control unit 30; and is also controlled by the engine control unit 20, and is not particularly limited in this embodiment.
Further, the bypass control unit 30 incorporates therein a first packet 31 for controlling the engine 10 during the compression ratio switching process; the engine control unit 20 incorporates a second packet 21 that controls the engine 10 to operate at a fixed compression ratio. According to the above, the bypass control unit 30 can also be used to determine whether the switching of the compression ratio of the engine 10 is completed, so the bypass control unit 30 integrates the first data packet 31 for controlling the engine 10 during the switching of the compression ratio, so as to facilitate the determination of whether the switching is completed; since the engine control unit 20 only needs to control the engine 10 to operate at the fixed compression ratio, the second packet 21 for controlling the engine 10 to operate at the fixed compression ratio is integrated in the engine control unit 20. In particular, during the calibration phase of the engine 10, the development computer 40 may be used to interface with the bypass control unit 30 to modify the data in the first data packet 31 thereof to optimize the operation of the engine 10.
More specifically, the bypass control unit 30 is connected to the engine control unit 20 via a data line for information exchange. In some other embodiments, the bypass control unit 30 and the engine control unit 20 may also perform information interaction through wireless communication technologies such as bluetooth and WIFI.
The embodiment also provides a control method of the compression ratio of the engine, which is realized by adopting the control system of the compression ratio of the engine 10; referring to fig. 2, the control method of the compression ratio of the engine 10 includes the steps of:
s100: the engine control unit 20 controls the engine 10 to operate at the first compression ratio;
s200: the bypass control unit 30 monitors real-time data of the operation of the engine 10 fed back by the engine control unit 20, and judges whether to switch the compression ratio, if so, the next step is carried out;
s300: the bypass control unit 30 sends a switching instruction to the engine control unit 20, and the engine control unit 20 controls the engine 10 to switch the compression ratio from the first compression ratio to the second compression ratio;
s400: the bypass control unit 30 determines whether the switching of the compression ratio is completed according to the fed back absolute value of the difference between the compression ratios of the last two cycles of the engine 10, if so, the next step is performed, otherwise, the step S200 is performed;
s500: the operation of the engine 10 is continued to be controlled by the engine control unit 20.
Further, in step S200, if it is determined that the compression ratio is not switched, the engine control unit 20 continues to control the operation of the engine 10 while keeping the compression ratio of the engine 10 unchanged.
Specifically, in step S400, the bypass control unit 30 determines that the conditions for completion of the compression ratio switching are: if the absolute value of the difference between the compression ratios of the last two cycles of the engine 10 is smaller than the preset threshold, it is determined that the switching of the compression ratios is completed, otherwise, it is determined that the switching of the compression ratios is not completed. In specific implementation, the preset threshold value can be set according to actual needs.
Specifically, in step S100, the first compression ratio is one of a high compression ratio and a low compression ratio, and the second compression ratio is divided into the other of the high compression ratio and the low compression ratio.
In step S200, the real-time data of the operation of the engine 10 includes at least the rotation speed, the load, and the compression ratio. Specifically, in the implementation, the rotation speed, the load, and the compression ratio are monitored as main parameters to determine whether to switch the compression ratio.
In the method for controlling the compression ratio of the engine 10 in the embodiment, the calibration work is simplified by only arranging two compression ratios, the corresponding implementation period is also shorter, the technical cost is reduced, the control logic is simplified, and the cost performance of the compression ratio control is improved. Meanwhile, the first compression ratio is one of the high compression ratio and the low compression ratio, and the second compression ratio is the other of the high compression ratio and the low compression ratio, namely only two limit compression ratios of the high compression ratio and the low compression ratio are selected, compared with a continuous variable compression ratio technology, the two-section variable compression ratio technology has the advantages of lower cost, simpler calibration work and more ideal contribution to the performance and the oil consumption of the engine 10.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A control system for the compression ratio of an engine, characterized by comprising an engine control unit (20) and a bypass control unit (30) which are in communication connection, wherein the engine control unit (20) is used for controlling the engine (10) to operate at a fixed compression ratio; the bypass control unit (30) is used for reading the running data of the engine (10) fed back by the engine control unit (20), judging whether to switch the compression ratio, transmitting a command of switching the compression ratio to the engine control unit (20) and judging whether the compression ratio switching is finished.
2. The control system of the engine compression ratio according to claim 1, characterized in that the bypass control unit (30) is further configured to control an ignition angle, an injection amount, and a throttle opening of the engine (10).
3. The control system of the engine compression ratio according to claim 1, characterized in that it is controlled by the bypass control unit (30).
4. The control system of the engine compression ratio according to claim 1, characterized in that it is controlled by the engine control unit (20).
5. The control system of the engine compression ratio according to claim 1, characterized in that a first data packet (31) for controlling the engine (10) during the compression ratio switching process is integrated in the bypass control unit (30); the engine control unit (20) is integrated with a second data packet (21) for controlling the engine (10) to operate under a fixed compression ratio.
6. The control system of the engine compression ratio according to claim 1, characterized in that the bypass control unit (30) is connected to the engine control unit (20) by a data line.
7. A control method using a control system of a compression ratio of an engine according to any one of claims 1 to 6, characterized by comprising the steps of:
s100: the engine control unit (20) controls the engine (10) to operate at a first compression ratio;
s200: the bypass control unit (30) monitors real-time data of the operation of the engine (10) fed back by the engine control unit (20), judges whether to switch the compression ratio or not, and enters the next step if the real-time data is judged to be switched;
s300: the bypass control unit (30) sends a switching instruction to the engine control unit (20), and the engine control unit (20) controls the engine (10) to switch the compression ratio from a first compression ratio to a second compression ratio;
s400: the bypass control unit (30) judges whether the switching of the compression ratio is finished according to the fed back absolute value of the difference value of the compression ratio of the last two cycles of the engine (10), if so, the next step is carried out, and if not, the step S200 is returned to;
s500: continuing to control the operation of the engine (10) by the engine control unit (20).
8. The method for controlling the engine compression ratio according to claim 7, characterized in that in step S200, if it is determined that the compression ratio switching is not performed, the engine control means (20) continues to control the operation of the engine (10) while keeping the compression ratio of the engine (10) unchanged.
9. The engine compression ratio control method according to claim 7, characterized in that in step S100, the first compression ratio is one of a high compression ratio and a low compression ratio, and the second compression ratio is divided into the other of the high compression ratio and the low compression ratio.
10. The method for controlling the compression ratio of an engine according to claim 7, characterized in that in step S200, said real-time data of the operation of the engine (10) comprise at least the speed, the load and the compression ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210724129.1A CN115045764A (en) | 2022-06-23 | 2022-06-23 | Control system and control method for engine compression ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210724129.1A CN115045764A (en) | 2022-06-23 | 2022-06-23 | Control system and control method for engine compression ratio |
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| CN115045764A true CN115045764A (en) | 2022-09-13 |
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| CN202210724129.1A Pending CN115045764A (en) | 2022-06-23 | 2022-06-23 | Control system and control method for engine compression ratio |
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Citations (9)
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| JP2018141442A (en) * | 2017-02-28 | 2018-09-13 | トヨタ自動車株式会社 | Control device of internal combustion engine |
| DE102018117047A1 (en) * | 2018-07-13 | 2018-09-27 | FEV Europe GmbH | Method for VCR control |
| CN110621862A (en) * | 2017-06-15 | 2019-12-27 | 日产自动车株式会社 | Control device and control method for direct injection engine |
| CN112664333A (en) * | 2020-04-01 | 2021-04-16 | 长城汽车股份有限公司 | Compression ratio control method for variable compression ratio engine |
-
2022
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040089253A1 (en) * | 2002-11-08 | 2004-05-13 | Ford Global Technologies, Inc. | Engine control with operating mode detection |
| US20080097685A1 (en) * | 2006-10-23 | 2008-04-24 | Hitachi, Ltd. | Start control apparatus of internal combustion engine |
| JP2012202239A (en) * | 2011-03-23 | 2012-10-22 | Toyota Motor Corp | Control device of variable compression ratio engine |
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